This study investigates the reduction in polarization measurement accuracy caused by varying in-cident angles in a liquid crystal variable retarder(LCVR).The phase delay characteristics of the LCVR were examined,with ...This study investigates the reduction in polarization measurement accuracy caused by varying in-cident angles in a liquid crystal variable retarder(LCVR).The phase delay characteristics of the LCVR were examined,with particular emphasis on the influence of different two-dimensional incident angles on phase delay behavior.Building upon the calibration of phase delay under normal incidence,a phase delay calibra-tion model was developed to account for variations in incident angle and driving voltage.A mathematical re-lationship was established between phase delay and the azimuth angle(α)and pitch angle(β).Experimental validation was conducted under three conditions:α=20°,β=0°;α=0°,β=20°;and an arbitrary angle whereα=5°,β=15°.The results demonstrated that the maximum average deviation between theoretical pre-dictions and experimental measurements did not exceed 0.059 rad.The proposed calibration method proved to be both accurate and practical.This approach offers robust support for LCVR parameter calibration and performance optimization in optical systems,particularly in polarization imaging applications.展开更多
Reinforced concrete(RC)beams face potential near-field blast threats as key structural components in building structures.To investigate the failure modes and dynamic responses of RC beams subjected to near-field blast...Reinforced concrete(RC)beams face potential near-field blast threats as key structural components in building structures.To investigate the failure modes and dynamic responses of RC beams subjected to near-field blast loading,this paper presents both blast tests and numerical simulation studies on RC beams.First,near-field blast tests were conducted on five RC beam specimens under strong and weak-axis bending loading.Then,a refined finite element model of RC beams was established to verify the applicability of the adopted finite element analysis method.Finally,based on the calibrated finite element model,the failure mechanisms of RC beams were explored,and the influence of blast incidence angle on the failure modes and dynamic responses of RC beams was investigated.The results indicate:(i)Near-field blast loading demonstrates pronounced non-uniform distribution patterns.Under strong-axis incidence,clearing effects beyond the mid-span region are more significant than weak-axis incidence,leading to accelerated impulse attenuation.(ii)Three consecutive developmental stages primarily control the damage mechanism of RC beams:stress wave-induced local damage,local deformation causing plastic hinge propagation,and free vibration of the beam;(iii)As the scaled distance decreases,the failure mode of RC beams under weak-axis blast loading evolves from flexural failure to local failure.The resistance mechanism of RC beams under weak-axis blast loading is more prone to transition from compressive membrane action to tensile membrane action,reducing their blast resistance capacity;(iv)As the explosion incident angleθincreases from 0°to 90°,the blast wave-structure interaction transitions from regular reflection to Mach reflection and back to normal reflection,causing the dynamic response of RC beams to first decrease then increase,with corner concrete spalling damage being the primary failure mode.展开更多
Tuberculosis(TB),one of the oldest infectious diseases caused by Mycobacterium tuberculosis,poses a considerable challenge to global public health.There are approximately 10 million new TB cases worldwide annually,and...Tuberculosis(TB),one of the oldest infectious diseases caused by Mycobacterium tuberculosis,poses a considerable challenge to global public health.There are approximately 10 million new TB cases worldwide annually,and TB claims the lives of nearly 3 million people each year,making it one of the leading causes of death from a single infectious disease[1].China ranks third globally in terms of TB burden,with approximately 733,000 TB cases reported in 2023[2].Based on the ecological model of health determinants developed by Whitehead and Dahlgren,health determinants can be classified into direct causes.展开更多
To extend the traditional generalized grey incidence model, a novel grey incidence model based on inter- val grey numbers is constructed. Considering the numerical information of indexes cannot be accurately obtained ...To extend the traditional generalized grey incidence model, a novel grey incidence model based on inter- val grey numbers is constructed. Considering the numerical information of indexes cannot be accurately obtained and can be defined as interval grey numbers, the interval grey numbers are defined as standard interval grey num- bers which are split in white part and grey part. The absolute degree of incidence and relative degree of incidence based on the interval grey numbers are constructed and their arithmetic are given. Finally, an example about commercial aircraft index selection illuminates the effectiveness of the model. The results show that the model can sort indexes better and can extend the grey incidence models significantly.展开更多
In April 2024,the International Agency for Research on Cancer(IARC)published the 2022 Global Cancer Statistics Report in CA:A Cancer Journal for Clinicians,focusing on the incidence of 36 kinds of cancers in 185 count...In April 2024,the International Agency for Research on Cancer(IARC)published the 2022 Global Cancer Statistics Report in CA:A Cancer Journal for Clinicians,focusing on the incidence of 36 kinds of cancers in 185 countries or regions around the world,different gender,geographical area and Human Development Index differences in different economic regions.Previously,China's National Cancer Center(NCC)collaborated with IARC to estimate China's cancer incidence data using actual and up-to-date surveillance data from China.This collaboration aimed to ensure consistency between the cancer burden data published by IARC and NCC.In February of the same year,the NCC released the latest estimated statistics regarding the cancer incidence in China for 2022 in the Journal of the National Cancer Center.This research seeks to gather and evaluate the latest reports on cancer incidence from both a global perspective and within China for the year 2022.By conducting a multi-dimensional analysis of cancer incidence patterns,gender distribution,geographic spread,and trends over time,the study highlights the distinctions in the burden of malignant tumors between China and the global scenario.Additionally,it explores the risk factors associated with high-incidence cancer types and examines the current status of prevention and control measures.The findings aim to serve as a valuable reference for developing effective cancer prevention and control strategies in China.展开更多
BACKGROUND Pelvic fractures are often associated with significant morbidity,including injuries to the urinary tract.Understanding the incidence and risk factors for urinary tract injury in these patients is crucial fo...BACKGROUND Pelvic fractures are often associated with significant morbidity,including injuries to the urinary tract.Understanding the incidence and risk factors for urinary tract injury in these patients is crucial for prompt diagnosis and management.This meta-analysis aims to synthesize existing evidence to determine the overall incidence and identify specific risk factors associated with urinary tract injuries in patients with pelvic fractures.AIM To determine the incidence and risk factors for urinary tract injuries in patients with pelvic fractures.METHODS A systematic search of PubMed,EMBASE,Scopus,and the Cochrane Library was conducted without date restrictions.Studies examining the incidence and risk factors of urinary tract injuries in patients with pelvic fractures were included.Data extracted included demographics,injury mechanism,pelvic fracture type,urinary tract injury incidence,mortality,and discharge disposition.Review Manager 5.4 was used for data analysis.RESULTS Ten studies comprising 22700 patients were included.The pooled incidence of urinary tract injury associated with pelvic fracture was 6.88%(95%CI:6.20%-7.55%).Vehicle,motorcycle,and pedestrian accidents were identified as risk factors for urinary tract injury,with relative risks(RR)of 1.08(95%CI:1.06-1.11),1.89(95%CI:1.78-2.00),and 1.53(95%CI:1.20-1.95),respectively.Pubic fracture and pelvic ring disruption were significantly associated with urinary tract injury[odds ratio(OR)1.94,95%CI:1.09-3.44 and OR 5.53,95%CI:4.67-6.54,respectively)].Patients without urinary tract injury were more likely to be discharged home(RR 0.79,95%CI:0.67-0.92).Mortality was higher in patients with urinary tract injury(OR 1.92,95%CI:1.77-2.09).CONCLUSION Urinary tract injury occurs in nearly 7%of patients with pelvic fractures.Motorcycle accidents,pubic fractures,and pelvic ring disruptions are significant risk factors.Urinary tract injury following pelvic fracture is associated with increased mortality.展开更多
BACKGROUND Postoperative delirium(POD)is a concerning complication of organ transplantation.With organ transplantation offering hope to patients with end-stage organ disease,understanding the incidence and risk factor...BACKGROUND Postoperative delirium(POD)is a concerning complication of organ transplantation.With organ transplantation offering hope to patients with end-stage organ disease,understanding the incidence and risk factors of POD is crucial,as it can significantly affect patients’prognosis and healthcare costs.AIM To systematically evaluate the incidence and risk factors of POD following organ transplantation to facilitate clinical prevention and optimize patient management and prognosis.METHODS Multiple databases such as PubMed and their reference lists were comprehensively searched using a combination of keywords related to organ transplantation and POD.Relevant observational studies on patients who had undergone solid organ transplantation and randomized controlled trials containing relevant analyses were included.Duplicated,data-deficient,non-English,and non-original data studies were excluded.Data were extracted independently by two researchers and then cross-checked.The Newcastle-Ottawa scale was used to evaluate the quality of the included studies.RevMan 5.3 was employed for data analysis.The pooled incidence of POD was calculated according to the data type,and the fixed or random effect model was employed to analyze risk factors based on heterogeneity.Subsequently,sensitivity analysis and publication bias assessments were performed.RESULTS A total of 39 relevant literatures were included.The overall incidence of POD in the organ transplant group was 20%[95%confidence interval(CI):18%-22%];liver transplant group,22%(95%CI:17%-26%);lung transplant group,34%(95%CI:23%-45%);and kidney transplant group,6%(95%CI:2%-10%).Primary graft dysfunction increased the POD risk,with a pooled odds ratio(OR)(95%CI)of 1.78(1.09-2.91).A history of hepatic encephalopathy increased the POD risk,with a pooled OR(95%CI)of 3.19(2.30-4.43).The higher the Acute Physiology and Chronic Health Evaluation II score,the greater the POD risk,with a pooled OR(95%CI)of 1.52(1.09-2.12).A history of alcohol abuse increased the POD risk,with a pooled OR(95%CI)of 2.84(1.74-4.65).Thus,the higher the model for end-stage liver disease score,the greater the POD risk,with a pooled OR(95%CI)of 2.49(1.14-5.43).POD was more likely to develop in patients with preoperative infections,with a pooled OR(95%CI)of 2.78(1.56-4.97).The use of diuretics increased the POD risk,with a pooled OR(95%CI)of 2.36(1.38-4.04).CONCLUSION In this study,the overall incidence of POD in patients who underwent organ transplantation is 20%.The incidence varies among different types of organ transplantation,and multiple factors can increase the POD risk.展开更多
BACKGROUND Post-hepatectomy portal vein thrombosis(PH-PVT)is a life-threatening complication;however,the available literature on this topic is limited.AIM To examine the incidence,risk factors,and outcomes associated ...BACKGROUND Post-hepatectomy portal vein thrombosis(PH-PVT)is a life-threatening complication;however,the available literature on this topic is limited.AIM To examine the incidence,risk factors,and outcomes associated with PH-PVT.METHODS Medical records of patients who underwent hepatic resection for various diseases between February 2014 and December 2023 at Beijing Tsinghua Changgung Hospital affiliated with Tsinghua University(Beijing,China)were retrospectively reviewed.The patients were divided into a PH-PVT group and a non-PH-PVT group.Univariate and multivariate logistic regression analyses were performed to identify the risk factors for PH-PVT.RESULTS A total of 1064 patients were included in the study cohort,and the incidence and mortality rates of PH-PVT were 3.9%and 35.7%,respectively.The median time from hepatectomy to the diagnosis of PH-PVT was 6 days.Multivariate analysis revealed that hepatectomy combined with pancreaticoduodenectomy(HPD)[odds ratio(OR)=7.627(1.390-41.842),P=0.019],portal vein reconstruction[OR=6.119(2.636-14.203),P<0.001]and a postoperative portal vein angle<100°[OR=2.457(1.131-5.348),P=0.023]were independent risk factors for PH-PVT.Age≥60 years[OR=8.688(1.774-42.539),P=0.008]and portal vein reconstruction[OR=6.182(1.246-30.687),P=0.026]were independent risk factors for mortality in PH-PVT patients.CONCLUSION Portal vein reconstruction,a postoperative portal vein angle<100°and HPD were independent risk factors for PHPVT.Age≥60 years and portal vein reconstruction were independent risk factors for mortality in PH-PVT patients.展开更多
BACKGROUND: Severe acute pancreatitis(SAP) is commonly associated with acute organ failure, but its effects on cerebral function within intensive care unit(ICU) patients remains inadequately researched. This study aim...BACKGROUND: Severe acute pancreatitis(SAP) is commonly associated with acute organ failure, but its effects on cerebral function within intensive care unit(ICU) patients remains inadequately researched. This study aims to determine the prevalence of delirium in critically ill patients diagnosed with SAP, and to identify risk factors associated with delirium in this patient population.METHODS: This was a retrospective, multicenter study, which enrolled adult patients diagnosed with SAP who admitted intensive care unit(ICU) for at least 24 h. Patient assessment was conducted using the Richmond Agitation-Sedation Scale(RASS) and the Confusion Assessment Method for the ICU(CAM-ICU). The cumulative incidence of delirium was determined. Demographic, clinical data, and length of ICU stay were compared between patients with and without delirium. A logistic regression model was employed to identify potential risk factors for delirium. RESuLTS: A total of 1,814 patients were included from seven hospitals in Anhui province, China. Delirium was observed in 25.2% of patients. Logistic regression analysis identified APACHE II scores(odds ratio [OR]=3.37, 95% confidence interval [CI]: 1.09–10.43, P=0.04), physical restraint(OR=11.11, 95%CI: 4.35–28.39, P<0.05), invasive mechanical ventilation(IMV)(OR=2.44, 95%CI: 1.41–4.25, P=0.002), and ICU length of stay ≥ 7 days(OR=3.14, 95%CI: 2.27–4.36, P<0.05) as independent risk factors of delirium.cONcLuSION: The present study revealed a substantial incidence of delirium in critically ill patients with SAP, associated with factors including APACHE II score, IMV, physical restraint, and prolonged ICU stays.展开更多
Gastric cancer(GC)remains one of the most common cancers and leading causes of cancer deaths globally1with 60.0%of cases and 56.6%of deaths occurring in East Asia.South Korea and Japan have conducted nationwide GC scr...Gastric cancer(GC)remains one of the most common cancers and leading causes of cancer deaths globally1with 60.0%of cases and 56.6%of deaths occurring in East Asia.South Korea and Japan have conducted nationwide GC screening programs for decades but with essential differences in strategies,organization,and coverage2.展开更多
Background:Hearing loss(HL)is one major cause of disability and can lead to social impairments.However,the relationship between loneliness and the risk of incident HL remains unclear.Our study aimed to investigate thi...Background:Hearing loss(HL)is one major cause of disability and can lead to social impairments.However,the relationship between loneliness and the risk of incident HL remains unclear.Our study aimed to investigate this association among adults in the UK.Methods:This cohort study was based on data from the UK Biobank study.Loneliness was assessed by asking participants if they often felt lonely.Incident HL was defined as a primary diagnosis,ascertained via linkage to electronic health records.Cox proportional hazard regression models were used to examine the association between loneliness and risk of incident HL.Results:Our analyses included 490,865 participants[mean(SD)age,56.5(8.1)years;54.4%female],among whom 90,893(18.5%)reported feeling lonely at baseline.Over a median follow-up period of 12.3 years(interquartile range,11.3 to 13.1),11,596 participants were diagnosed with incident HL.Compared to non-lonely participants,lonely individuals exhibited an increased risk of HL[hazard ratio(HR),1.36;95%confidence interval(CI),1.30 to 1.43].This association remained(HR,1.24;95%CI,1.17 to 1.31)after adjusting for potential confounders,including age,sex,socioeconomic status,biological and lifestyle factors,social isolation,depression,chronic diseases,use of ototoxic drugs,and genetic risk of HL.The joint analysis showed that loneliness was significantly associated with an increased risk of incident HL across all levels of genetic risks for HL.Conclusions:Loneliness was associated with the risk of incident HL independent of other prominent risk factors.Social enhancement strategies aimed at alleviating loneliness may prove beneficial in HL prevention.展开更多
Objective Pulmonary arterial hypertension(PAH)poses a growing global health challenge,yet comprehensive epidemiological data remain limited.This study aims to assess the burden of PAH from 1990 to 2021 and project tre...Objective Pulmonary arterial hypertension(PAH)poses a growing global health challenge,yet comprehensive epidemiological data remain limited.This study aims to assess the burden of PAH from 1990 to 2021 and project trends to 2040,addressing critical gaps in incidence,mortality,and disability-adjusted life years(DALYs)across diverse socio-demographic contexts.Methods Using data from the Global Burden of Disease(GBD)2021 study,we analyzed PAH burden across 204 countries and territories,stratified by age,sex,region,and socio-demographic index(SDI).Age-standardized rates(per 100,000 populations)for incidence(ASIR),mortality(ASMR),and DALYs(ASDR)were calculated.Future trends were projected via a Bayesian age-period-cohort(BAPC)model.Results In 2021,there were 43,251(95%uncertainty interval[UI]:34,705,52,441)global incident PAH cases(age standardized incidence rate[ASIR]:0.52).From 1990 to 2021,PAH incidence rose by 85.62%,with the steepest increase in high-middle SDI regions(average annual percentage change[AAPC]:+0.19%).Despite a 48.36%rise in deaths,the age-standardized mortality rate(ASMR)declined annually by 0.84%,reflecting improved management.Central Europe had the highest ASMR(1.06 per 100,000),while low SDI regions showed reduced ASIR(−0.31%AAPC),likely due to underdiagnosis.PAH caused 642,104 DALYs globally in 2021,with infants(<1 year)bearing the highest DALY rate.Projections indicate 75,000 annual cases by 2040,emphasizing an escalating burden.Conclusion PAH burden is increasing disproportionately in aging populations and high-middle SDI regions,while low SDI areas face underdiagnosis and healthcare disparities.Targeted interventions,equitable resource allocation,and enhanced diagnostic capacity are urgently needed to mitigate future PAH-related morbidity and mortality.展开更多
Background As the population in China rapidly ages,the prevalence of mild cognitive impairment(MCI)is increasing considerably.However,the causes of MCI vary.The continued lack of understanding of the various subtypes ...Background As the population in China rapidly ages,the prevalence of mild cognitive impairment(MCI)is increasing considerably.However,the causes of MCI vary.The continued lack of understanding of the various subtypes of MCI impedes the implementation of effective measures to reduce the risk of advancing to more severe cognitive diseases.Aims To estimate the prevalence and incidence rates of two MCI subtypes—amnestic MCI(aMCI)and vascular cognitive impairment without dementia(VCIND)—and to determine modifiable factors for them among older individuals in a multiregional Chinese cohort.Method This 1-year longitudinal study surveyed a random sample of participants aged≥60 years from a large,community-dwelling cohort in China.Baseline lifestyle data were self-reported,while vascular and comorbid conditions were obtained from medical records and physical examinations.In total,3514 and 2051 individuals completed the baseline and 1-year follow-up assessments,respectively.Logistic and linear regression analyses were used to identify the modifiable factors for MCI subtypes and predictors of cognitive decline,respectively.Results Among our participants,aMCI and VCIND demonstrated prevalence of 14.83%and 2.71%,respectively,and annual incidence(per 1000 person-years)of 69.6 and 10.6,respectively.The risk factor for aMCI was age,whereas its protective factors were high education level,tea consumption and physical activity.Moreover,VCIND risk factors were age,hypertension and depression.The presence of endocrine disease,cerebral trauma or hypertension was associated with a faster decline in cognition over 1 year.Conclusions MCI is a serious health problem in China that will only worsen as the population ages if no widespread interventions are implemented.Preventive strategies that promote brain activity and support healthy lifestyle choices are required.We identified modifiable factors for MCI in older individuals.The easy-to-adopt solutions such as tea consumption and physical activity can aid in preventing MCI.展开更多
Despite numerous research investigations to understand the influences of various structural parameters,to the authors'knowledge,no research has been the effect of different angles of incidence on stab response and...Despite numerous research investigations to understand the influences of various structural parameters,to the authors'knowledge,no research has been the effect of different angles of incidence on stab response and performance of different types of protective textiles.Three distinct structures of 3D woven textiles and 2D plain weave fabric made with similar high-performance fiber and areal density were designed and manufactured to be tested.Two samples,one composed of a single and the other of 4-panel layers,from each fabric type structure,were prepared,and tested against stabbing at[0○],[22.5○],and[45○]angle of incidence.A new stabbing experimental setup that entertained testing of the specimens at various angles of incidence was engineered and utilized.The stabbing bench is also equipped with magnetic sensors and a UK Home Office Scientific Development Branch(HOSDB)/P1/B sharpness engineered knives to measure the impact velocity and exerted impact energy respectively.A silicon compound was utilized to imprint the Back Face Signature(BFS)on the backing material after every specimen test.Each silicon print was then scanned,digitized,and precisely measured to evaluate the stab response and performance of the specimen based on different performance variables,including Depth of Trauma(DOT),Depth of Penetration(DOP),and Length of Penetration(LOP).Besides,the post-impact surface failure modes of the fabrics were also measured using Image software and analyzed at the microscale level.The results show stab angle of incidence greatly influences the stab response and performance of protective textiles.The outcome of the study could provide not only valuable insights into understanding the stab response and capabilities of protective textiles under different angle of incidence,but also provide valuable information for protective textile manufacturer,armor developer and stab testing and standardizing organizations to consider the angle of incidence while developing,testing,optimizing,and using protective textiles in various applications.展开更多
In sub-Saharan Africa, foodborne Salmonella infections cause around 680,000 deaths per year. The evolutionary aspects of the incidence of antibiotic resistance in Salmonella strains no longer seem to attract much inte...In sub-Saharan Africa, foodborne Salmonella infections cause around 680,000 deaths per year. The evolutionary aspects of the incidence of antibiotic resistance in Salmonella strains no longer seem to attract much interest in the Central African Republic (CAR), although salmonellosis remains a health problem requiring national and international surveillance. Methodology: The study conducted at the National Laboratory of Clinical Biology and Public Health, Bangui, Central African Republic (LNBCSP) was a retrospective descriptive study. The study duration was five years (January 2019 to December 2023). The study sample consisted of patients who underwent bacteriological testing of stool, blood and urine samples for Salmonella at the LNBCSP in Bangui during this period. Study variables were age, sex, year and bacteriological test results. Statistical tests were used to compare incidences. Relative risks (RR) were calculated to measure the degree of association. Results: From 2019 to 2023, we recorded 353 Salmonella strains, of which 5% were found in blood, 37% in urine and 58% in stool. Patient age ranged from 1 to 86 years, with a mean of 27 ± 22.05 years and a mode of 5 years. Children aged 0 to 14 years (34%) and females (55.81%) predominated. The highest rate of contamination by Salmonella strains was 1.69% in 2022. The overall incidence of salmonellosis was 6.72 in 2019, 7.05 in 2020, 6.91 in 2021, 16.9 in 2022 and 6.26 in 2023 per 1000 samples. Resistance was 30.47% to β_lactam antibiotics, 24.22% to fluroquinolones and 37.97% to Salmonella spp. For Salmonella arizonae strains, resistance was 20.25% to aminoglycosides, 43.67% to chloramphenicol and 7.59% to imipenem. Conclusion: Laboratory-based surveillance of antibiotic resistance in Salmonella strains is needed in both human and veterinary medicine. Another study based on molecular characterization will identify new antibiotic-resistant variants circulating in CAR.展开更多
The concept of the incidence chromatic number of a graph was introduced by Brualdi and Massey. They conjectured that every graph G can be incidence colored with Δ (G) +2 colors. In this paper, the trueness of this co...The concept of the incidence chromatic number of a graph was introduced by Brualdi and Massey. They conjectured that every graph G can be incidence colored with Δ (G) +2 colors. In this paper, the trueness of this conjecture for complete k partite graph was proved, and the incidence chromatic number of complete k partite graphs was calculated.展开更多
In order to avoid the noise and over fitting and further improve the limited classification performance of the real decision tree, a traffic incident detection method based on the random forest algorithm is presented....In order to avoid the noise and over fitting and further improve the limited classification performance of the real decision tree, a traffic incident detection method based on the random forest algorithm is presented. From the perspective of classification strength and correlation, three experiments are performed to investigate the potential application of random forest to traffic incident detection： comparison with a different number of decision trees; comparison with different decision trees; comparison with the neural network. The real traffic data of the 1-880 database is used in the experiments. The detection performance is evaluated by the common criteria including the detection rate, the false alarm rate, the mean time to detection, the classification rate and the area under the curve of the receiver operating characteristic （ROC）. The experimental results indicate that the model based on random forest can improve the decision rate, reduce the testing time, and obtain a higher classification rate. Meanwhile, it is competitive compared with multi-layer feed forward neural networks （MLF）.展开更多
Ultrasonic cement bond logging is a widely used method for evaluating cementing quality. Conventional ultrasonic cement bond logging uses vertical incidence and cannot accurately evaluate lightweight cement bonding. O...Ultrasonic cement bond logging is a widely used method for evaluating cementing quality. Conventional ultrasonic cement bond logging uses vertical incidence and cannot accurately evaluate lightweight cement bonding. Oblique incidence is a new technology for evaluating cement quality with improved accuracy for lightweight cements. In this study, we simulated models of acoustic impedance of cement and cementing quality using ultrasonic oblique incidence, and we obtained the relation between cementing quality, acoustic impedance of cement, and the acoustic attenuation coeffi cient of the A0-mode and S0-mode Lamb waves. Then, we simulated models of different cement thickness and we obtained the relation between cement thickness and the time difference of the arrival between the A0 and A0′ modes.展开更多
An estimation method for aircraft similarity based on fuzzy theory and grey incidence analysis is presented. This estimation method is made up of the triangular fuzzy transforming model of linguistic variables and the...An estimation method for aircraft similarity based on fuzzy theory and grey incidence analysis is presented. This estimation method is made up of the triangular fuzzy transforming model of linguistic variables and the method of grey incidence analysis. Nine feature attributes of aircraft are selected to estimate the similarity between the new aircraft and the existing aircraft. A new aircraft X and other six existing aircrafts are taken as examples. Analyses show that similarity estimation results obtained from the method are in accordance with practice.展开更多
An optimal resource dispatching method is proposed to solve the multiple-response problem under the conditions of potential incidents on freeway networks.Travel time of the response vehicle is selected instead of rout...An optimal resource dispatching method is proposed to solve the multiple-response problem under the conditions of potential incidents on freeway networks.Travel time of the response vehicle is selected instead of route distance as the weight to reflect the impact of traffic conditions on the decisions of rescue resources.According to the characteristics of different types of rescue vehicles the dispatching decision-making time is revised to show the heterogeneity among different rescue vehicle dispatching modes. The genetic algorithm is used to obtain the solutions to the rescue resources dispatching model. A case study shows that the proposed method can accurately reveal the impact of potential incidents on the costs of rescues according to the variations in the types and quantities of rescue resources and the optimal dispatching plan with respect to potential incidents can be obtained.The proposed method is applicable in real world scenarios.展开更多
文摘This study investigates the reduction in polarization measurement accuracy caused by varying in-cident angles in a liquid crystal variable retarder(LCVR).The phase delay characteristics of the LCVR were examined,with particular emphasis on the influence of different two-dimensional incident angles on phase delay behavior.Building upon the calibration of phase delay under normal incidence,a phase delay calibra-tion model was developed to account for variations in incident angle and driving voltage.A mathematical re-lationship was established between phase delay and the azimuth angle(α)and pitch angle(β).Experimental validation was conducted under three conditions:α=20°,β=0°;α=0°,β=20°;and an arbitrary angle whereα=5°,β=15°.The results demonstrated that the maximum average deviation between theoretical pre-dictions and experimental measurements did not exceed 0.059 rad.The proposed calibration method proved to be both accurate and practical.This approach offers robust support for LCVR parameter calibration and performance optimization in optical systems,particularly in polarization imaging applications.
基金supported by the National Natural Science Foundation of China(Grant Nos.52178445,52578544)Open Research Fund of State Key Laboratory of Target Vulnerability Assessment,Defense Engineering Institute,AMS(Grant No.YSX2024KFYS002).
文摘Reinforced concrete(RC)beams face potential near-field blast threats as key structural components in building structures.To investigate the failure modes and dynamic responses of RC beams subjected to near-field blast loading,this paper presents both blast tests and numerical simulation studies on RC beams.First,near-field blast tests were conducted on five RC beam specimens under strong and weak-axis bending loading.Then,a refined finite element model of RC beams was established to verify the applicability of the adopted finite element analysis method.Finally,based on the calibrated finite element model,the failure mechanisms of RC beams were explored,and the influence of blast incidence angle on the failure modes and dynamic responses of RC beams was investigated.The results indicate:(i)Near-field blast loading demonstrates pronounced non-uniform distribution patterns.Under strong-axis incidence,clearing effects beyond the mid-span region are more significant than weak-axis incidence,leading to accelerated impulse attenuation.(ii)Three consecutive developmental stages primarily control the damage mechanism of RC beams:stress wave-induced local damage,local deformation causing plastic hinge propagation,and free vibration of the beam;(iii)As the scaled distance decreases,the failure mode of RC beams under weak-axis blast loading evolves from flexural failure to local failure.The resistance mechanism of RC beams under weak-axis blast loading is more prone to transition from compressive membrane action to tensile membrane action,reducing their blast resistance capacity;(iv)As the explosion incident angleθincreases from 0°to 90°,the blast wave-structure interaction transitions from regular reflection to Mach reflection and back to normal reflection,causing the dynamic response of RC beams to first decrease then increase,with corner concrete spalling damage being the primary failure mode.
基金supported by the National Natural Science Foundation of China(82574173,82003516)Jiangsu Provincial Natural Science Foundation(BK20251958)+2 种基金Jiangsu Provincial Medical Key Discipline(ZDXK202250)Top Talent Awards Project Fund(RDF-TP-0023,RDF-TP-0030)Postgraduate Research Fund(PGRS2112022)at Xi'an Jiaotong-Liverpool University.
文摘Tuberculosis(TB),one of the oldest infectious diseases caused by Mycobacterium tuberculosis,poses a considerable challenge to global public health.There are approximately 10 million new TB cases worldwide annually,and TB claims the lives of nearly 3 million people each year,making it one of the leading causes of death from a single infectious disease[1].China ranks third globally in terms of TB burden,with approximately 733,000 TB cases reported in 2023[2].Based on the ecological model of health determinants developed by Whitehead and Dahlgren,health determinants can be classified into direct causes.
基金Supported by the National Natural Science Foundation of China(70901041,71171113)the Joint Research Project of National Natural Science Foundation of China and Royal Society of UK(71111130211)+3 种基金the Major Program of National Funds of Social Science of Chinathe Doctoral Fund of Ministry of Education of China(20093218120032,200802870020)the Qinglan Project for Excellent Youth Teacher in Jiangsu Province(China)the Research Funding of Nanjing University of Aeronautics and Astronautics(NR2011002,NJ2011009)~~
文摘To extend the traditional generalized grey incidence model, a novel grey incidence model based on inter- val grey numbers is constructed. Considering the numerical information of indexes cannot be accurately obtained and can be defined as interval grey numbers, the interval grey numbers are defined as standard interval grey num- bers which are split in white part and grey part. The absolute degree of incidence and relative degree of incidence based on the interval grey numbers are constructed and their arithmetic are given. Finally, an example about commercial aircraft index selection illuminates the effectiveness of the model. The results show that the model can sort indexes better and can extend the grey incidence models significantly.
文摘In April 2024,the International Agency for Research on Cancer(IARC)published the 2022 Global Cancer Statistics Report in CA:A Cancer Journal for Clinicians,focusing on the incidence of 36 kinds of cancers in 185 countries or regions around the world,different gender,geographical area and Human Development Index differences in different economic regions.Previously,China's National Cancer Center(NCC)collaborated with IARC to estimate China's cancer incidence data using actual and up-to-date surveillance data from China.This collaboration aimed to ensure consistency between the cancer burden data published by IARC and NCC.In February of the same year,the NCC released the latest estimated statistics regarding the cancer incidence in China for 2022 in the Journal of the National Cancer Center.This research seeks to gather and evaluate the latest reports on cancer incidence from both a global perspective and within China for the year 2022.By conducting a multi-dimensional analysis of cancer incidence patterns,gender distribution,geographic spread,and trends over time,the study highlights the distinctions in the burden of malignant tumors between China and the global scenario.Additionally,it explores the risk factors associated with high-incidence cancer types and examines the current status of prevention and control measures.The findings aim to serve as a valuable reference for developing effective cancer prevention and control strategies in China.
文摘BACKGROUND Pelvic fractures are often associated with significant morbidity,including injuries to the urinary tract.Understanding the incidence and risk factors for urinary tract injury in these patients is crucial for prompt diagnosis and management.This meta-analysis aims to synthesize existing evidence to determine the overall incidence and identify specific risk factors associated with urinary tract injuries in patients with pelvic fractures.AIM To determine the incidence and risk factors for urinary tract injuries in patients with pelvic fractures.METHODS A systematic search of PubMed,EMBASE,Scopus,and the Cochrane Library was conducted without date restrictions.Studies examining the incidence and risk factors of urinary tract injuries in patients with pelvic fractures were included.Data extracted included demographics,injury mechanism,pelvic fracture type,urinary tract injury incidence,mortality,and discharge disposition.Review Manager 5.4 was used for data analysis.RESULTS Ten studies comprising 22700 patients were included.The pooled incidence of urinary tract injury associated with pelvic fracture was 6.88%(95%CI:6.20%-7.55%).Vehicle,motorcycle,and pedestrian accidents were identified as risk factors for urinary tract injury,with relative risks(RR)of 1.08(95%CI:1.06-1.11),1.89(95%CI:1.78-2.00),and 1.53(95%CI:1.20-1.95),respectively.Pubic fracture and pelvic ring disruption were significantly associated with urinary tract injury[odds ratio(OR)1.94,95%CI:1.09-3.44 and OR 5.53,95%CI:4.67-6.54,respectively)].Patients without urinary tract injury were more likely to be discharged home(RR 0.79,95%CI:0.67-0.92).Mortality was higher in patients with urinary tract injury(OR 1.92,95%CI:1.77-2.09).CONCLUSION Urinary tract injury occurs in nearly 7%of patients with pelvic fractures.Motorcycle accidents,pubic fractures,and pelvic ring disruptions are significant risk factors.Urinary tract injury following pelvic fracture is associated with increased mortality.
基金Supported by the Health Commission of Guangxi Zhuang Autonomous Region Self-Funded Research Projects,No.Z20180575 and No.Z-A20231058.
文摘BACKGROUND Postoperative delirium(POD)is a concerning complication of organ transplantation.With organ transplantation offering hope to patients with end-stage organ disease,understanding the incidence and risk factors of POD is crucial,as it can significantly affect patients’prognosis and healthcare costs.AIM To systematically evaluate the incidence and risk factors of POD following organ transplantation to facilitate clinical prevention and optimize patient management and prognosis.METHODS Multiple databases such as PubMed and their reference lists were comprehensively searched using a combination of keywords related to organ transplantation and POD.Relevant observational studies on patients who had undergone solid organ transplantation and randomized controlled trials containing relevant analyses were included.Duplicated,data-deficient,non-English,and non-original data studies were excluded.Data were extracted independently by two researchers and then cross-checked.The Newcastle-Ottawa scale was used to evaluate the quality of the included studies.RevMan 5.3 was employed for data analysis.The pooled incidence of POD was calculated according to the data type,and the fixed or random effect model was employed to analyze risk factors based on heterogeneity.Subsequently,sensitivity analysis and publication bias assessments were performed.RESULTS A total of 39 relevant literatures were included.The overall incidence of POD in the organ transplant group was 20%[95%confidence interval(CI):18%-22%];liver transplant group,22%(95%CI:17%-26%);lung transplant group,34%(95%CI:23%-45%);and kidney transplant group,6%(95%CI:2%-10%).Primary graft dysfunction increased the POD risk,with a pooled odds ratio(OR)(95%CI)of 1.78(1.09-2.91).A history of hepatic encephalopathy increased the POD risk,with a pooled OR(95%CI)of 3.19(2.30-4.43).The higher the Acute Physiology and Chronic Health Evaluation II score,the greater the POD risk,with a pooled OR(95%CI)of 1.52(1.09-2.12).A history of alcohol abuse increased the POD risk,with a pooled OR(95%CI)of 2.84(1.74-4.65).Thus,the higher the model for end-stage liver disease score,the greater the POD risk,with a pooled OR(95%CI)of 2.49(1.14-5.43).POD was more likely to develop in patients with preoperative infections,with a pooled OR(95%CI)of 2.78(1.56-4.97).The use of diuretics increased the POD risk,with a pooled OR(95%CI)of 2.36(1.38-4.04).CONCLUSION In this study,the overall incidence of POD in patients who underwent organ transplantation is 20%.The incidence varies among different types of organ transplantation,and multiple factors can increase the POD risk.
文摘BACKGROUND Post-hepatectomy portal vein thrombosis(PH-PVT)is a life-threatening complication;however,the available literature on this topic is limited.AIM To examine the incidence,risk factors,and outcomes associated with PH-PVT.METHODS Medical records of patients who underwent hepatic resection for various diseases between February 2014 and December 2023 at Beijing Tsinghua Changgung Hospital affiliated with Tsinghua University(Beijing,China)were retrospectively reviewed.The patients were divided into a PH-PVT group and a non-PH-PVT group.Univariate and multivariate logistic regression analyses were performed to identify the risk factors for PH-PVT.RESULTS A total of 1064 patients were included in the study cohort,and the incidence and mortality rates of PH-PVT were 3.9%and 35.7%,respectively.The median time from hepatectomy to the diagnosis of PH-PVT was 6 days.Multivariate analysis revealed that hepatectomy combined with pancreaticoduodenectomy(HPD)[odds ratio(OR)=7.627(1.390-41.842),P=0.019],portal vein reconstruction[OR=6.119(2.636-14.203),P<0.001]and a postoperative portal vein angle<100°[OR=2.457(1.131-5.348),P=0.023]were independent risk factors for PH-PVT.Age≥60 years[OR=8.688(1.774-42.539),P=0.008]and portal vein reconstruction[OR=6.182(1.246-30.687),P=0.026]were independent risk factors for mortality in PH-PVT patients.CONCLUSION Portal vein reconstruction,a postoperative portal vein angle<100°and HPD were independent risk factors for PHPVT.Age≥60 years and portal vein reconstruction were independent risk factors for mortality in PH-PVT patients.
基金supported by Anhui Provincial Scientific Research Preparation Plan Project(2023AH040079)Anhui Provincial Health Research Project(AHWJ2023A10095).
文摘BACKGROUND: Severe acute pancreatitis(SAP) is commonly associated with acute organ failure, but its effects on cerebral function within intensive care unit(ICU) patients remains inadequately researched. This study aims to determine the prevalence of delirium in critically ill patients diagnosed with SAP, and to identify risk factors associated with delirium in this patient population.METHODS: This was a retrospective, multicenter study, which enrolled adult patients diagnosed with SAP who admitted intensive care unit(ICU) for at least 24 h. Patient assessment was conducted using the Richmond Agitation-Sedation Scale(RASS) and the Confusion Assessment Method for the ICU(CAM-ICU). The cumulative incidence of delirium was determined. Demographic, clinical data, and length of ICU stay were compared between patients with and without delirium. A logistic regression model was employed to identify potential risk factors for delirium. RESuLTS: A total of 1,814 patients were included from seven hospitals in Anhui province, China. Delirium was observed in 25.2% of patients. Logistic regression analysis identified APACHE II scores(odds ratio [OR]=3.37, 95% confidence interval [CI]: 1.09–10.43, P=0.04), physical restraint(OR=11.11, 95%CI: 4.35–28.39, P<0.05), invasive mechanical ventilation(IMV)(OR=2.44, 95%CI: 1.41–4.25, P=0.002), and ICU length of stay ≥ 7 days(OR=3.14, 95%CI: 2.27–4.36, P<0.05) as independent risk factors of delirium.cONcLuSION: The present study revealed a substantial incidence of delirium in critically ill patients with SAP, associated with factors including APACHE II score, IMV, physical restraint, and prolonged ICU stays.
基金supported by grants from the Shanghai Key Disciplines of Public Health(2023-2025)for New Threeyear Action Plan(Grant Nos.GWVI-11.1-22 and GWVI-11.1-23)the Fudan School of Public Health-Jiading CDC key disciplines for the high-quality development of public health(Grant No.GWGZLXK-2023-02)the Fudan Undergraduate Research Opportunities Program(Grant No.FDUROP-24647)。
文摘Gastric cancer(GC)remains one of the most common cancers and leading causes of cancer deaths globally1with 60.0%of cases and 56.6%of deaths occurring in East Asia.South Korea and Japan have conducted nationwide GC screening programs for decades but with essential differences in strategies,organization,and coverage2.
基金supported by the Young Elite Scientists Sponsorship Program by China Association for Science and Technology(grant number 2020QNRC001 to Y.X.)the LiaoNing Revitalization Talents Program(grant number XLYC2203168 to Y.X.)+1 种基金the 345 Talent Project of Shengjing Hospital of China Medical University(grant number M0294 to Y.X.)the Scientific Research Project of the Liaoning Province Education Department(grant number LJKMZ20221149 to Y.X.).
文摘Background:Hearing loss(HL)is one major cause of disability and can lead to social impairments.However,the relationship between loneliness and the risk of incident HL remains unclear.Our study aimed to investigate this association among adults in the UK.Methods:This cohort study was based on data from the UK Biobank study.Loneliness was assessed by asking participants if they often felt lonely.Incident HL was defined as a primary diagnosis,ascertained via linkage to electronic health records.Cox proportional hazard regression models were used to examine the association between loneliness and risk of incident HL.Results:Our analyses included 490,865 participants[mean(SD)age,56.5(8.1)years;54.4%female],among whom 90,893(18.5%)reported feeling lonely at baseline.Over a median follow-up period of 12.3 years(interquartile range,11.3 to 13.1),11,596 participants were diagnosed with incident HL.Compared to non-lonely participants,lonely individuals exhibited an increased risk of HL[hazard ratio(HR),1.36;95%confidence interval(CI),1.30 to 1.43].This association remained(HR,1.24;95%CI,1.17 to 1.31)after adjusting for potential confounders,including age,sex,socioeconomic status,biological and lifestyle factors,social isolation,depression,chronic diseases,use of ototoxic drugs,and genetic risk of HL.The joint analysis showed that loneliness was significantly associated with an increased risk of incident HL across all levels of genetic risks for HL.Conclusions:Loneliness was associated with the risk of incident HL independent of other prominent risk factors.Social enhancement strategies aimed at alleviating loneliness may prove beneficial in HL prevention.
基金supported by the Hubei Provincial Natural Science Foundation of China(Grant No.2025AFB068)Jin-zhu Zhao was supported by the Wuhan Natural Science Foundation Exploration Program(Chen Guang Program,Grant No.2024040801020344).
文摘Objective Pulmonary arterial hypertension(PAH)poses a growing global health challenge,yet comprehensive epidemiological data remain limited.This study aims to assess the burden of PAH from 1990 to 2021 and project trends to 2040,addressing critical gaps in incidence,mortality,and disability-adjusted life years(DALYs)across diverse socio-demographic contexts.Methods Using data from the Global Burden of Disease(GBD)2021 study,we analyzed PAH burden across 204 countries and territories,stratified by age,sex,region,and socio-demographic index(SDI).Age-standardized rates(per 100,000 populations)for incidence(ASIR),mortality(ASMR),and DALYs(ASDR)were calculated.Future trends were projected via a Bayesian age-period-cohort(BAPC)model.Results In 2021,there were 43,251(95%uncertainty interval[UI]:34,705,52,441)global incident PAH cases(age standardized incidence rate[ASIR]:0.52).From 1990 to 2021,PAH incidence rose by 85.62%,with the steepest increase in high-middle SDI regions(average annual percentage change[AAPC]:+0.19%).Despite a 48.36%rise in deaths,the age-standardized mortality rate(ASMR)declined annually by 0.84%,reflecting improved management.Central Europe had the highest ASMR(1.06 per 100,000),while low SDI regions showed reduced ASIR(−0.31%AAPC),likely due to underdiagnosis.PAH caused 642,104 DALYs globally in 2021,with infants(<1 year)bearing the highest DALY rate.Projections indicate 75,000 annual cases by 2040,emphasizing an escalating burden.Conclusion PAH burden is increasing disproportionately in aging populations and high-middle SDI regions,while low SDI areas face underdiagnosis and healthcare disparities.Targeted interventions,equitable resource allocation,and enhanced diagnostic capacity are urgently needed to mitigate future PAH-related morbidity and mortality.
基金supported by the Major Project of Wuxi Municipal Health Commission[grant number:Z202406]the Jiangsu Commission of Health Program[grant number:M2024010]+3 种基金the National Key Research and Development Program[grant number:2022YFC3600600]the China Ministry of Science and Technology grants[grant number:2009BAI77B03]the Shanghai Municipal Education Commission-Gaofeng Clinical Medicine Grant Support[grant number:20172029]the Innovative Research Team of High-level Local Universities in Shanghai[grant number:ZDCX20211201].
文摘Background As the population in China rapidly ages,the prevalence of mild cognitive impairment(MCI)is increasing considerably.However,the causes of MCI vary.The continued lack of understanding of the various subtypes of MCI impedes the implementation of effective measures to reduce the risk of advancing to more severe cognitive diseases.Aims To estimate the prevalence and incidence rates of two MCI subtypes—amnestic MCI(aMCI)and vascular cognitive impairment without dementia(VCIND)—and to determine modifiable factors for them among older individuals in a multiregional Chinese cohort.Method This 1-year longitudinal study surveyed a random sample of participants aged≥60 years from a large,community-dwelling cohort in China.Baseline lifestyle data were self-reported,while vascular and comorbid conditions were obtained from medical records and physical examinations.In total,3514 and 2051 individuals completed the baseline and 1-year follow-up assessments,respectively.Logistic and linear regression analyses were used to identify the modifiable factors for MCI subtypes and predictors of cognitive decline,respectively.Results Among our participants,aMCI and VCIND demonstrated prevalence of 14.83%and 2.71%,respectively,and annual incidence(per 1000 person-years)of 69.6 and 10.6,respectively.The risk factor for aMCI was age,whereas its protective factors were high education level,tea consumption and physical activity.Moreover,VCIND risk factors were age,hypertension and depression.The presence of endocrine disease,cerebral trauma or hypertension was associated with a faster decline in cognition over 1 year.Conclusions MCI is a serious health problem in China that will only worsen as the population ages if no widespread interventions are implemented.Preventive strategies that promote brain activity and support healthy lifestyle choices are required.We identified modifiable factors for MCI in older individuals.The easy-to-adopt solutions such as tea consumption and physical activity can aid in preventing MCI.
文摘Despite numerous research investigations to understand the influences of various structural parameters,to the authors'knowledge,no research has been the effect of different angles of incidence on stab response and performance of different types of protective textiles.Three distinct structures of 3D woven textiles and 2D plain weave fabric made with similar high-performance fiber and areal density were designed and manufactured to be tested.Two samples,one composed of a single and the other of 4-panel layers,from each fabric type structure,were prepared,and tested against stabbing at[0○],[22.5○],and[45○]angle of incidence.A new stabbing experimental setup that entertained testing of the specimens at various angles of incidence was engineered and utilized.The stabbing bench is also equipped with magnetic sensors and a UK Home Office Scientific Development Branch(HOSDB)/P1/B sharpness engineered knives to measure the impact velocity and exerted impact energy respectively.A silicon compound was utilized to imprint the Back Face Signature(BFS)on the backing material after every specimen test.Each silicon print was then scanned,digitized,and precisely measured to evaluate the stab response and performance of the specimen based on different performance variables,including Depth of Trauma(DOT),Depth of Penetration(DOP),and Length of Penetration(LOP).Besides,the post-impact surface failure modes of the fabrics were also measured using Image software and analyzed at the microscale level.The results show stab angle of incidence greatly influences the stab response and performance of protective textiles.The outcome of the study could provide not only valuable insights into understanding the stab response and capabilities of protective textiles under different angle of incidence,but also provide valuable information for protective textile manufacturer,armor developer and stab testing and standardizing organizations to consider the angle of incidence while developing,testing,optimizing,and using protective textiles in various applications.
文摘In sub-Saharan Africa, foodborne Salmonella infections cause around 680,000 deaths per year. The evolutionary aspects of the incidence of antibiotic resistance in Salmonella strains no longer seem to attract much interest in the Central African Republic (CAR), although salmonellosis remains a health problem requiring national and international surveillance. Methodology: The study conducted at the National Laboratory of Clinical Biology and Public Health, Bangui, Central African Republic (LNBCSP) was a retrospective descriptive study. The study duration was five years (January 2019 to December 2023). The study sample consisted of patients who underwent bacteriological testing of stool, blood and urine samples for Salmonella at the LNBCSP in Bangui during this period. Study variables were age, sex, year and bacteriological test results. Statistical tests were used to compare incidences. Relative risks (RR) were calculated to measure the degree of association. Results: From 2019 to 2023, we recorded 353 Salmonella strains, of which 5% were found in blood, 37% in urine and 58% in stool. Patient age ranged from 1 to 86 years, with a mean of 27 ± 22.05 years and a mode of 5 years. Children aged 0 to 14 years (34%) and females (55.81%) predominated. The highest rate of contamination by Salmonella strains was 1.69% in 2022. The overall incidence of salmonellosis was 6.72 in 2019, 7.05 in 2020, 6.91 in 2021, 16.9 in 2022 and 6.26 in 2023 per 1000 samples. Resistance was 30.47% to β_lactam antibiotics, 24.22% to fluroquinolones and 37.97% to Salmonella spp. For Salmonella arizonae strains, resistance was 20.25% to aminoglycosides, 43.67% to chloramphenicol and 7.59% to imipenem. Conclusion: Laboratory-based surveillance of antibiotic resistance in Salmonella strains is needed in both human and veterinary medicine. Another study based on molecular characterization will identify new antibiotic-resistant variants circulating in CAR.
文摘The concept of the incidence chromatic number of a graph was introduced by Brualdi and Massey. They conjectured that every graph G can be incidence colored with Δ (G) +2 colors. In this paper, the trueness of this conjecture for complete k partite graph was proved, and the incidence chromatic number of complete k partite graphs was calculated.
基金The National High Technology Research and Development Program of China(863 Program)(No.2012AA112304)the Scientific Innovation Research of College Graduates in Jiangsu Province(No.CXZZ13-0119)
文摘In order to avoid the noise and over fitting and further improve the limited classification performance of the real decision tree, a traffic incident detection method based on the random forest algorithm is presented. From the perspective of classification strength and correlation, three experiments are performed to investigate the potential application of random forest to traffic incident detection： comparison with a different number of decision trees; comparison with different decision trees; comparison with the neural network. The real traffic data of the 1-880 database is used in the experiments. The detection performance is evaluated by the common criteria including the detection rate, the false alarm rate, the mean time to detection, the classification rate and the area under the curve of the receiver operating characteristic （ROC）. The experimental results indicate that the model based on random forest can improve the decision rate, reduce the testing time, and obtain a higher classification rate. Meanwhile, it is competitive compared with multi-layer feed forward neural networks （MLF）.
基金partially supported by the National Natural Science Foundation of China(Nos.11204380,11374371,61102102,and 11134011)National Science and Technology Major Project(No.2011ZX05020-009)+1 种基金Petro China Innovation Foundation(No.2013D-5006-0304)Chinese Petroleum Corporation Project(Nos.2011A-3903 and 2011B-4001)
文摘Ultrasonic cement bond logging is a widely used method for evaluating cementing quality. Conventional ultrasonic cement bond logging uses vertical incidence and cannot accurately evaluate lightweight cement bonding. Oblique incidence is a new technology for evaluating cement quality with improved accuracy for lightweight cements. In this study, we simulated models of acoustic impedance of cement and cementing quality using ultrasonic oblique incidence, and we obtained the relation between cementing quality, acoustic impedance of cement, and the acoustic attenuation coeffi cient of the A0-mode and S0-mode Lamb waves. Then, we simulated models of different cement thickness and we obtained the relation between cement thickness and the time difference of the arrival between the A0 and A0′ modes.
文摘An estimation method for aircraft similarity based on fuzzy theory and grey incidence analysis is presented. This estimation method is made up of the triangular fuzzy transforming model of linguistic variables and the method of grey incidence analysis. Nine feature attributes of aircraft are selected to estimate the similarity between the new aircraft and the existing aircraft. A new aircraft X and other six existing aircrafts are taken as examples. Analyses show that similarity estimation results obtained from the method are in accordance with practice.
基金The National Natural Science Foundation of China(No.71101025)the Science and Technology Key Plan Project of Changzhou(No.CE20125001)
文摘An optimal resource dispatching method is proposed to solve the multiple-response problem under the conditions of potential incidents on freeway networks.Travel time of the response vehicle is selected instead of route distance as the weight to reflect the impact of traffic conditions on the decisions of rescue resources.According to the characteristics of different types of rescue vehicles the dispatching decision-making time is revised to show the heterogeneity among different rescue vehicle dispatching modes. The genetic algorithm is used to obtain the solutions to the rescue resources dispatching model. A case study shows that the proposed method can accurately reveal the impact of potential incidents on the costs of rescues according to the variations in the types and quantities of rescue resources and the optimal dispatching plan with respect to potential incidents can be obtained.The proposed method is applicable in real world scenarios.
