期刊文献+
共找到9,148篇文章
< 1 2 250 >
每页显示 20 50 100
Effect of Compound Danshen Dripping Pills on cardiac function after acute anterior ST-segment elevation myocardial infarction:A randomized trial 被引量:1
1
作者 Bo Deng Sibo Wang +14 位作者 Yujie Wu Qiming Wang Rui Qiao Xiwen Zhang Yuan Lu Li Wang Shunzhong Gu Yuqing Zhang Kaiqiao Li Zongliang Yu Lixing Wu Shengbiao Zhao Shuanglin Zhou Yang Yang Liansheng Wang 《Journal of Biomedical Research》 2025年第4期407-416,I0018,共11页
The current study aimed to evaluate the efficacy and safety of Compound Danshen Dripping Pills(CDDP)in improving cardiac function in patients with acute anterior ST-segment elevation myocardial infarction(AAMI).Betwee... The current study aimed to evaluate the efficacy and safety of Compound Danshen Dripping Pills(CDDP)in improving cardiac function in patients with acute anterior ST-segment elevation myocardial infarction(AAMI).Between February 2021 and February 2023,247 eligible patients with AAMI after primary percutaneous coronary intervention were enrolled and randomly assigned(1∶1)to receive CDDP(n=126)or placebo(n=121),with a follow-up of 48 weeks.Compared with the placebo group,the CDDP group demonstrated a significant increase in left ventricular ejection fraction values after 24 weeks of treatment(least squares mean:3.31;95%confidence interval[CI]:1.72–4.90;P<0.001)and at the 48-week follow-up(least squares mean:4.35;95%CI:2.76–5.94;P<0.001).Significant reductions in N-terminal pro-B-type natriuretic peptide levels were observed in both groups at the 24-and 48-week visits with no significant difference between the two groups(P>0.1 for all).The incidence of major adverse cardiovascular and cerebrovascular events was 6.35%in the CDDP group and 5.79%in the placebo group(P=0.822).Notably,no serious adverse events were attributed to CDDP.These findings suggest that CDDP may be well tolerated and could improve left ventricular ejection fraction in patients with AAMI at 24 and 48 weeks. 展开更多
关键词 Compound Danshen Dripping Pills cardiac function acute anterior myocardial infarction randomized controlled trial
暂未订购
Equivalent Conditions of Complete Convergence for Weighted Sums of Sequences of i.i.d.Random Variables under Sublinear Expectations
2
作者 XU Mingzhou CHENG Kun 《应用概率统计》 北大核心 2025年第3期339-352,共14页
The complete convergence for weighted sums of sequences of independent,identically distributed random variables under sublinear expectation space is studied.By moment inequality and truncation methods,we establish the... The complete convergence for weighted sums of sequences of independent,identically distributed random variables under sublinear expectation space is studied.By moment inequality and truncation methods,we establish the equivalent conditions of complete convergence for weighted sums of sequences of independent,identically distributed random variables under sublinear expectation space.The results complement the corresponding results in probability space to those for sequences of independent,identically distributed random variables under sublinear expectation space. 展开更多
关键词 complete convergence weighted sums i.i.d.random variables sublinear expectation
在线阅读 下载PDF
Complete f-Moment Convergence for Sung’s Type Weighted Sums of Negatively Superadditive Dependent Random Variables
3
作者 HU Xueping WANG Liuliu +1 位作者 HU Ke XU Zhonghao 《应用概率统计》 北大核心 2025年第4期585-601,共17页
In this paper,by utilizing the Marcinkiewicz-Zygmund inequality and Rosenthal-type inequality of negatively superadditive dependent(NSD)random arrays and truncated method,we investigate the complete f-moment convergen... In this paper,by utilizing the Marcinkiewicz-Zygmund inequality and Rosenthal-type inequality of negatively superadditive dependent(NSD)random arrays and truncated method,we investigate the complete f-moment convergence of NSD random variables.We establish and improve a general result on the complete f-moment convergence for Sung’s type randomly weighted sums of NSD random variables under some general assumptions.As an application,we show the complete consistency for the randomly weighted estimator in a nonparametric regression model based on NSD errors. 展开更多
关键词 Marcinkiewicz-Zygmund inequality Rosenthal-type inequality Sung’s type randomly weighted sums negatively superadditive dependent random variables complete f-moment convergence
在线阅读 下载PDF
Complete q-Order Moment Convergence of Moving Average Processes Generated by Negatively Dependent Random Variables under Sub-Linear Expectations
4
作者 Mingzhou XU 《Journal of Mathematical Research with Applications》 2025年第3期395-410,共16页
Assume that{a_(i),−∞<i<∞}is an absolutely summable sequence of real numbers.We establish the complete q-order moment convergence for the partial sums of moving average processes{X_(n)=Σ_(i=−∞)^(∞)a_(i)Y_(i+... Assume that{a_(i),−∞<i<∞}is an absolutely summable sequence of real numbers.We establish the complete q-order moment convergence for the partial sums of moving average processes{X_(n)=Σ_(i=−∞)^(∞)a_(i)Y_(i+n),n≥1}under some proper conditions,where{Yi,-∞<i<∞}is a doubly infinite sequence of negatively dependent random variables under sub-linear expectations.These results extend and complement the relevant results in probability space. 展开更多
关键词 moving average processes negatively dependent random variables complete moment convergence sub-linear expectations
原文传递
On α-Bloch Functions in Several Complex Variables
5
作者 ZHU Ting YANG Liu 《Chinese Quarterly Journal of Mathematics》 2025年第1期93-102,共10页
In this paper,we establish characterizations of α-Bloch functions and little α-Bloch functions on the unit ball as well as the unit polydisk of C^(m),which generalize and improve results of Aulaskari-Lappan,Minda,Au... In this paper,we establish characterizations of α-Bloch functions and little α-Bloch functions on the unit ball as well as the unit polydisk of C^(m),which generalize and improve results of Aulaskari-Lappan,Minda,Aulaskari-Wulan,and Wu.Some examples are also given to complement our theory. 展开更多
关键词 α-Bloch function Littleα-Bloch function Several complex variables Partial derivative
在线阅读 下载PDF
Evaluating the Impact of Different Electrocardiogram Methods on Detecting Pacemaker Dysfunction and Cardiac Function Changes in Pacemaker Patients
6
作者 Yan Li Chun Zhou +1 位作者 Ying Li Binlin Chen 《Journal of Clinical and Nursing Research》 2025年第8期7-13,共7页
Objective:To investigate the effect of 12-lead electrocardiogram and 24-hour dynamic electrocardiogram in detecting pacemaker dysfunction and changes in cardiac function indexes in patients with pacemaker implantation... Objective:To investigate the effect of 12-lead electrocardiogram and 24-hour dynamic electrocardiogram in detecting pacemaker dysfunction and changes in cardiac function indexes in patients with pacemaker implantation.Methods:A total of 136 patients with pacemaker implantation in the First Clinical Medical College of Three Gorges University,Institute of Cardiovascular Disease of Three Gorges University and Yicang Central People’s Hospital from January 2023 to December 2024 were selected as the research objects.All patients received 12-lead electrocardiogram and 24-hour holter 3–14 days after implantation.Results:The overall detection rate of various types of pacemaker dysfunction by Holter was significantly higher than that by conventional ECG(27.21%vs.5.15%,χ^(2)=24.402,P<0.001).The overall arrhythmia detection rate of Holter was significantly higher than that of conventional electrocardiogram(57.35%vs.10.29%,χ^(2)=67.277,P<0.001).The time domain indexes of heart rate variability obtained by 24-hour continuous monitoring of Holter were significantly improved compared with those of conventional electrocardiogram(P<0.05).Conclusions:Compared with 12-lead electrocardiogram,24-hour holter monitoring can more accurately detect pacemaker dysfunction and arrhythmia in patients with pacemaker implantation,and provide more comprehensive data of heart rate variability,which is helpful for clinicians to better evaluate the cardiac function of patients and adjust treatment plans. 展开更多
关键词 Pacemaker implantation ELECTROCaRDIOGRaM abnormal pacemaker function Cardiac arrhythmia Heart rate variability
暂未订购
Research on the Impact of the Early Rehabilitation Management Model Based on Efficacy Linkage on Functional Recovery of Patients After Cerebral Hemorrhage Surgery
7
作者 Ting Yin 《Journal of Clinical and Nursing Research》 2025年第10期108-113,共6页
Objective:To investigate the effects of performance-linked early rehabilitation management model on the recovery of neurological function,motor function and activities of daily living in patients after intracerebral h... Objective:To investigate the effects of performance-linked early rehabilitation management model on the recovery of neurological function,motor function and activities of daily living in patients after intracerebral hemorrhage surgery.Methods:A randomized controlled trial design was adopted.A total of 120 patients after cerebral hemorrhage surgery admitted to our hospital from June 2023 to June 2024 were selected as the research subjects and were randomly divided into the experimental group and the control group,with 60 cases in each group according to the random number table method.The control group received routine postoperative care and rehabilitation guidance in neurosurgery,while the experimental group implemented an efficacy linkage early rehabilitation management model on the basis of routine care.Before the intervention,4 weeks after the intervention,and 12 weeks after the intervention,the National Institutes of Health Stroke Scale(NIHSS),the Fugl-Meyer Assessment of Motor Function(FMA),and the Barthel Index(BI)were used to assess the degree of neurological deficits,motor function,and activities of daily living in patients,respectively.Results:After 4 weeks and 12 weeks of intervention,the NIHSS scores of the experimental group[(8.5±2.1)points,(5.2±1.8)points]were significantly lower than those of the control group[(10.8±2.4)points,(7.9±2.2)points](P<0.01);FMA scores[(58.4±10.2)points,(78.6±12.4)points]and BI scores[(55.3±11.5)points,(72.8±13.2)points]were significantly higher than those of the control group[(45.2±9.8)points,(62.3±11.7)points;(42.1±10.6)points,(58.4±12.5)points](P<0.01).Conclusion:The performance-linked early rehabilitation management model can effectively promote the recovery of neurological and motor functions in patients after cerebral hemorrhage surgery and significantly improve their ability to take care of themselves in daily living.It is an efficient rehabilitation management strategy. 展开更多
关键词 Cerebral hemorrhage Early rehabilitation Efficacy linkage functional recovery Postoperative recovery randomized controlled trials
暂未订购
Association of heart rate variability index with depressive symptoms and lung function in chronic obstructive pulmonary disease
8
作者 Ya-Ping Yang Mei-Jia Ji +1 位作者 Yue-Han Guo Na Yao 《World Journal of Psychiatry》 2025年第5期127-135,共9页
BACKGROUND Depression is a common comorbidity in patients with chronic obstructive pulmonary disease(COPD).Research indicates that COPD affects cardiac au-tonomic control,and heart rate variability(HRV)serves as a sim... BACKGROUND Depression is a common comorbidity in patients with chronic obstructive pulmonary disease(COPD).Research indicates that COPD affects cardiac au-tonomic control,and heart rate variability(HRV)serves as a simple,non-invasive measure of autonomic nerve activity.However,the relationship between HRV and lung function,as well as the impact of depressive symptoms,remains un-clear.METHODS A retrospective cross-sectional study involving 120 COPD patients hospitalized from January 2018 to January 2024 at our institution was conducted.Demographic and clinical characteristics were collected,and depressive symptoms were asse-ssed using the Beck Depression Inventory(BDI).Patients were categorized into a depressed group(BDI≥16)and a non-depressed group(BDI<16).A control group consisting of 60 healthy volunteers who underwent check-ups at the same institution was also included.Statistical analyses were performed using SPSS 26.0 software.Pearson correlation coefficients were calculated to determine and compare the relationships between HRV parameters,lung function measures,and RESULTS Of the 120 patients with COPD,35.8%(43/120)were diagnosed with depression,compared to 5.0%(3/60)in the control group.The HRV index in COPD patients was significantly lower than that in the control group(P<0.05),and the value in the depressed group was significantly lower than that in the non-depressed group(P<0.05).Similarly,the COPD group had a significantly lower pulmonary forced vital capacity(FVC),first-second expiratory volume(FEV1)and FEV1/FVC ratios than the control group(P<0.05),and the depressed group was significantly lower than that in the non-depressed group(P<0.05).Pearson correlation analysis revealed that the standard deviation of normal R-R intervals,standard deviation of the mean of 5-minute normal R-R intervals,root mean square of successive differences of normal R-R intervals,percentage of normal R-R intervals greater than 50 ms,high-frequency,and low-frequency indices showed positive correlations with lung function parameters(P<0.05)and negative correlations with BDI scores(P<0.05).CONCLUSION Compared to patients without COPD,the incidence of depressive symptoms is higher among patients with COPD and is negatively correlated with the patients’HRV indices.In contrast,HRV indices are positively correlated with the patients’pulmonary function parameters.Patients and healthcare professionals should enhance their awareness of depression,actively conduct depression assessment screenings,and incorporate HRV indices into disease management.This approach aims to improve the psychological health of patients and ultimately enhance their prognosis and quality of life. 展开更多
关键词 Chronic obstructive pulmonary disease Heart rate variability Lung function DEPRESSION Beck depression inventory
暂未订购
Experimental Realization of Physical Unclonable Function Chip Utilizing Spintronic Memories
9
作者 Xiuye Zhang Chuanpeng Jiang +11 位作者 Jialiang Yin Daoqian Zhu Shiqi Wang Sai Li Zhongxiang Zhang Ao Du Wenlong Cai Hongxi Liu Kewen Shi Kaihua Cao Zhaohao Wang Weisheng Zhao 《Engineering》 2025年第6期141-148,共8页
In recent years,physical unclonable function(PUF)has emerged as a lightweight solution in the Internet of Things security.However,conventional PUFs based on complementary metal oxide semiconductor(CMOS)present challen... In recent years,physical unclonable function(PUF)has emerged as a lightweight solution in the Internet of Things security.However,conventional PUFs based on complementary metal oxide semiconductor(CMOS)present challenges such as insufficient randomness,significant power and area overhead,and vulnerability to environmental factors,leading to reduced reliability.In this study,we realize a strong,highly reliable and reconfigurable PUF with resistance against machine-learning attacks in a 1 kb spinorbit torque magnetic random access memory fabricated using a 180 nm CMOS process.This strong PUF achieves a challenge-response pair capacity of 10^(9) through a computing-in-memory approach.The results demonstrate that the proposed PUF exhibits near-ideal performance metrics:50.07% uniformity,50% diffuseness,49.89% uniqueness,and a bit error rate of 0%,even in a 375 K environment.The reconfigurability of PUF is demonstrated by a reconfigurable Hamming distance of 49.31% and a correlation coefficient of less than 0.2,making it difficult to extract output keys through side-channel analysis.Furthermore,resistance to machine-learning modeling attacks is confirmed by achieving an ideal accuracy prediction of approximately 50% in the test set. 展开更多
关键词 Physical unclonable function Spin-orbit torque magnetic random access memory Computing-in-memory RECONFIGURaBILITY Machine-learning attack
在线阅读 下载PDF
Seven Traditional Chinese Medicine external treatments combined with rehabilitation training on the functional recovery of limbs in patients with cerebral hemorrhage: a network Meta-analysis
10
作者 CHEN Ziying ZHAO Xiaoping +5 位作者 FAN Xiaoxuan TANG Didi SUN Wen LYU Jing HUANG Lan QI Fan 《Journal of Traditional Chinese Medicine》 2025年第4期711-719,共9页
OBJECTIVE:To evaluate the effectiveness of the combined use of 7 commonly used Traditional Chinese Medicine external treatment methods and rehabilitation training in improving limb function in patients with cerebral h... OBJECTIVE:To evaluate the effectiveness of the combined use of 7 commonly used Traditional Chinese Medicine external treatment methods and rehabilitation training in improving limb function in patients with cerebral hemorrhage through a network Meta-analysis.METHODS:A computer-based search was conducted in 8 databases,including China National Knowledge Infrastructure Database,Wanfang Database,China Science and Technology Journal Database,Pub Med,Cochrane Library,Web of Science,Scopus,and Embase,from their inception until February 19,2023.Randomized controlled trials(RCTs)investigating the effectiveness of the combined use of 7 commonly used Traditional Chinese Medicine external treatment methods and rehabilitation training in improving limb function in patients with cerebral hemorrhage were included.Two researchers independently screened the literature,extracted data from the included studies,and performed quality assessment using the Cochrane Collaboration's standards.The software Stata 17.0 was used to create a network evidence graph for each combination of Traditional Chinese Medicine external treatment methods and rehabilitation training,and to generate a publication bias funnel plot.Network Meta-analysis was conducted using Rev Man 5.3 to assess the risk of bias in the included studies,with mean difference(MD)used for continuous variables and odds ratio(OR)used for dichotomous variables.If there was good consistency among the included studies(P>0.05),a consistency model was applied for data analysis.If there was poor consistency among the included studies(P<0.05),an inconsistency model was used.RESULTS:A total of 27 studies involving 2113 patients with limb dysfunction caused by cerebral hemorrhage were included.The results of the network Meta-analysis indicated that the combined use of 7 Traditional Chinese Medicine external treatment methods and rehabilitation training was more effective in improving limb function in patients with cerebral hemorrhage compared to rehabilitation training alone.In terms of improving simplified Fugl-Meyer Assessment(FMA)scores,the effectiveness ranking was as follows:acupuncture+rehabilitation training>Acupoint sticking therapy+rehabilitation training>massage+rehabilitation training>electroacupuncture+rehabilitation training>moxibustion+rehabilitation training>Traditional Chinese Medicine therapy+rehabilitation training>Chinese herbal fumigation+rehabilitation training.In terms of improving Barthel Index(BI)scores,the effectiveness ranking was as follows:electroacupuncture+rehabilitation training>Acupoint sticking therapy+rehabilitation training>acupuncture+rehabilitation training>massage+rehabilitation training>moxibustion+rehabilitation training>Traditional Chinese Medicine fumigation+rehabilitation training>Traditional Chinese Medicine therapy+rehabilitation training.CONCLUSION:Based on existing literature evidence,our findings suggest the following:(a)The combination of the seven commonly used external treatment methods with rehabilitation training is superior to using rehabilitation training alone for the treatment of hemiplegia resulting from cerebral hemorrhage.(b)In terms of improving FMA scores,the combination of acupuncture and rehabilitation training shows the most significant effectiveness.(c)In terms of improving BI scores,the combination of electro-acupuncture and rehabilitation training demonstrates the most significant effectiveness.Therefore,we still need more multicenter,large-sample,high-quality randomized controlled trials to further validate the findings of this study. 展开更多
关键词 cerebral hemorrhage randomized controlled trial network Meta-analysis limb function Traditional Chinese Medicine external treatment
原文传递
Role of the Gut–Brain Axis in Chronotype-Driven Alzheimer's Disease: A Mendelian Randomization Study
11
作者 Jingting Kong Mengxue Wang +2 位作者 Xuezi Zhang Zan Wang Qingguo Ren 《Biomedical and Environmental Sciences》 2025年第4期519-524,共6页
Chronotype is determined by circadian rhythms,influenced by polygenic variations and environmental factors. Typically, chronotypes are categorized into morning-, intermediate-, and evening-types^([1]). Most cognitive ... Chronotype is determined by circadian rhythms,influenced by polygenic variations and environmental factors. Typically, chronotypes are categorized into morning-, intermediate-, and evening-types^([1]). Most cognitive functions follow daily and circadian rhythms, with the “synchronization effect” reflecting performance variations between optimal and non-optimal times based on an individual's chronotype. 展开更多
关键词 cognitive functions CHRONOTYPE circadian rhythmsinfluenced gut brain axis Mendelian randomization circadian rhythms synchronization effect performance variations
暂未订购
Complete Convergenceand Complete Moment Convergence for Weighted Sums of ANA Random Variables 被引量:1
12
作者 MENG Bing WU Qunying 《应用概率统计》 CSCD 北大核心 2024年第5期710-724,共15页
In this paper,we investigate the complete convergence and complete moment conver-gence for weighted sums of arrays of rowwise asymptotically negatively associated(ANA)random variables,without assuming identical distri... In this paper,we investigate the complete convergence and complete moment conver-gence for weighted sums of arrays of rowwise asymptotically negatively associated(ANA)random variables,without assuming identical distribution.The obtained results not only extend those of An and Yuan[1]and Shen et al.[2]to the case of ANA random variables,but also partially improve them. 展开更多
关键词 aNa random variables complete convergence complete moment convergence weighted sums
在线阅读 下载PDF
Analysis of Influencing Factors of Academic Warning in Higher Vocational Colleges Based on the Importance of Machine Learning Features and Paths to Improve Learning Ability 被引量:1
13
作者 Meimei Huang Lei Zhang Xifeng Fan 《Journal of Contemporary Educational Research》 2025年第5期75-80,共6页
The traditional academic warning methods for students in higher vocational colleges are relatively backward,single,and have many influencing factors,which have a limited effect on improving their learning ability.A da... The traditional academic warning methods for students in higher vocational colleges are relatively backward,single,and have many influencing factors,which have a limited effect on improving their learning ability.A data set was established by collecting academic warning data of students in a certain university.The importance of the school,major,grade,and warning level for the students was analyzed using the Pearson correlation coefficient,random forest variable importance,and permutation importance.It was found that the characteristic of the major has a great impact on the academic warning level.Countermeasures such as dynamic adjustment of majors,reform of cognitive adaptation of courses,full-cycle academic support,and data-driven precise intervention were proposed to provide theoretical support and practical paths for universities to improve the efficiency of academic warning and enhance students’learning ability. 展开更多
关键词 academic warning Pearson correlation coefficient random forest variable importance Permutation importance
在线阅读 下载PDF
Longitudinal structural vulnerability analysis of shield tunnels under adjacent excavation disturbances
14
作者 PENG Zhu SHI Cheng-hua +2 位作者 WANG Zu-xian LEI Ming-feng PENG Li-min 《Journal of Central South University》 2025年第6期2256-2272,共17页
This paper proposes a longitudinal vulnerability-based analysis method to evaluate the impact of foundation pit excavation on shield tunnels,accounting for geological uncertainties.First,the shield tunnel is modeled a... This paper proposes a longitudinal vulnerability-based analysis method to evaluate the impact of foundation pit excavation on shield tunnels,accounting for geological uncertainties.First,the shield tunnel is modeled as an Euler Bernoulli beam resting on the Pasternak foundation incorporating variability in subgrade parameters along the tunnel’s length.A random analysis method using random field theory is introduced to evaluate the tunnel’s longitudinal responses to excavation.Next,a risk assessment index system is established.The normalized relative depth between the excavation and the shield tunnel is used as a risk index,while the maximum longitudinal deformation,the maximum circumferential opening,and the maximum longitudinal bending moment serve as performance indicators.Based on these,a method for analyzing the longitudinal fragility of shield tunnels under excavation-induced disturbances is proposed.Finally,the technique is applied to a case study involving a foundation pit excavation above a shield tunnel,which is the primary application scenario of this method.Vulnerability curves for different performance indicators are derived,and the effects of tunnel stiffness and subgrade stiffness on the tunnel vulnerability are explored.The results reveal significant differences in vulnerability curves depending on the performance index used.Compared to the maximum circumferential opening and the maximum longitudinal bending moment,selecting the maximum longitudinal deformation as the control index better ensures the tunnel’s usability and safety under excavation disturbances.The longitudinal vulnerability of the shield tunnel nonlinearly decreases with the increase of the tunnel stiffness and subgrade stiffness,and the subgrade stiffness has a more pronounced effect.Parametric analyses suggest that actively reinforcing the substratum is more effective on reducing the risk of tunnel failure due to adjacent excavations than passive reinforcement of the tunnel structure. 展开更多
关键词 shield tunnel foundation pit excavation foundation variability random field VULNERaBILITY
在线阅读 下载PDF
Testing independence in Hilbert spaces using random projection
15
作者 HU Zhi-ming JIANG Tao XU Jin-feng 《Applied Mathematics(A Journal of Chinese Universities)》 2025年第3期666-686,共21页
As data becomes increasingly complex,measuring dependence among variables is of great interest.However,most existing measures of dependence are limited to the Euclidean setting and cannot effectively characterize the ... As data becomes increasingly complex,measuring dependence among variables is of great interest.However,most existing measures of dependence are limited to the Euclidean setting and cannot effectively characterize the complex relationships.In this paper,we propose a novel method for constructing independence tests for random elements in Hilbert spaces,which includes functional data as a special case.Our approach is using distance covariance of random projections to build a test statistic that is computationally efficient and exhibits strong power performance.We prove the equivalence between testing for independence expressed on the original and the projected covariates,bridging the gap between measures of testing independence in Euclidean spaces and Hilbert spaces.Implementation of the test involves calibration by permutation and combining several p-values from different projections using the false discovery rate method.Simulation studies and real data examples illustrate the finite sample properties of the proposed method under a variety of scenarios. 展开更多
关键词 computational efficiency distance covariance false discovery rate functional data Hilbert space permutation calibration random projection
在线阅读 下载PDF
Determination of support mechanical mechanism of pre-stressed expandable props to stope roof in room-and-pillar mining
16
作者 LI Kun-meng WANG Yong-jiang +3 位作者 LIU Kai LI Yuan-hui FU Zheng-chun PANG Bo-xue 《Journal of Central South University》 2025年第9期3539-3556,共18页
This study is to determine the support mechanism of pre-stressed expandable props for the stope roof in room- and-pillar mining, which is crucial for maintaining stability and preventing roof collapse in mines. Utiliz... This study is to determine the support mechanism of pre-stressed expandable props for the stope roof in room- and-pillar mining, which is crucial for maintaining stability and preventing roof collapse in mines. Utilizing an engineering case from a gold mine in Dandong, China, a laboratory-based similar test is conducted to extract the actual roof characteristic curve. This test continues until the mining stope collapses due to a U-shaped failure. Concurrently, a semi-theoretical method for obtaining the roof characteristic curve is proposed and verified against the actual curve. The semi-theoretical method calculated that the support force and vertical displacement at the demarcation point between the elastic and plastic zones of the roof characteristic curve are 5.0 MPa and 8.20 mm, respectively, corroborating well with the laboratory-based similar test results of 0.22 MPa and 0.730 mm. The weakening factor for the plastic zone in the roof characteristic curve was semi-theoretically estimated to be 0.75. The intersection between the actual roof characteristic curve and the support characteristic curves of expandable props, natural pillars, and concrete props indicates that the expandable prop is the most effective “yielding support” for the stope roof in room-and-pillar mining. That is, the deformation and failure of the stope roof can be effectively controlled with proper release of roof stress. This study provides practical insights for optimizing support strategies in room-and-pillar mining, enhancing the safety and efficiency of mining operations. 展开更多
关键词 expandable prop room-and-pillar mining complex variable function roof characteristic curve support characteristic curve yielding support
在线阅读 下载PDF
Computerized cognitive behavioral therapy with sertraline in schizophrenia with depressive episodes: A 12-week randomized controlled trial
17
作者 Ren-Chun Huang Nicha Wareesawetsuwan +1 位作者 Nan Lin Xiao-Dan Li 《World Journal of Psychiatry》 2025年第11期357-366,共10页
BACKGROUND Schizophrenia is commonly associated with comorbid depression,which exacerbates cognitive impairments and negatively impacts quality of life.Despite the high prevalence and burden of these comorbidities,eff... BACKGROUND Schizophrenia is commonly associated with comorbid depression,which exacerbates cognitive impairments and negatively impacts quality of life.Despite the high prevalence and burden of these comorbidities,effective treatment options,particularly for cognitive dysfunction,remain limited.AIM To evaluate the efficacy of computerized cognitive behavioral therapy(CCBT)with sertraline vs sertraline monotherapy in improving depressive symptoms,cognitive function,and quality of life in schizophrenia and depressive episodes.METHODS In this single-center,randomized controlled trial,68 adults[mean age(SD)=36.5(10.0),57.4%male]with schizophrenia and depressive symptoms were randomly assigned to receive either CCBT with sertraline or sertraline monotherapy during a 4-week hospitalization.The CCBT intervention involved 45-60-minute sessions twice weekly for four weeks.Outcomes included comparisons of depressive symptoms(Calgary depression scale for schizophrenia),cognitive function[MATRICS consensus cognitive battery(MCCB)],and quality of life(36-item short form survey)between the groups.RESULTS The experimental group showed greater improvements in depressive symptoms at 4,8,and 12 weeks compared to the controls,with the most notable difference at 12 weeks[mean difference(MD)=-1.7;P<0.001;Cohen’s d=0.9].Cognitive function improved across all MCCB domains in the experimental group,with higher processing speed scores(MD=4.1;P=0.043;Cohen’s d=0.5)and social cognition scores(MD=4.9;P=0.006;Cohen’s d=0.7)than in the control group.Quality of life,particularly in mental health,was significantly better in the experimental group.CONCLUSION CCBT with sertraline was more effective than sertraline monotherapy for patients with schizophrenia and depressive episodes,supporting its use as an adjunctive therapy. 展开更多
关键词 Schizophrenia with depressive episode Computerized cognitive behavioral therapy SERTRaLINE Cognitive function Quality of life randomized controlled trial
暂未订购
An Improved Multi-objective Artificial Hummingbird Algorithm for Capacity Allocation of Supercapacitor Energy Storage Systems in Urban Rail Transit
18
作者 Xin Wang Jian Feng Yuxin Qin 《Journal of Bionic Engineering》 2025年第2期866-883,共18页
To address issues such as poor initial population diversity, low stability and local convergence accuracy, and easy local optima in the traditional Multi-Objective Artificial Hummingbird Algorithm (MOAHA), an Improved... To address issues such as poor initial population diversity, low stability and local convergence accuracy, and easy local optima in the traditional Multi-Objective Artificial Hummingbird Algorithm (MOAHA), an Improved MOAHA (IMOAHA) was proposed. The improvements involve Tent mapping based on random variables to initialize the population, a logarithmic decrease strategy for inertia weight to balance search capability, and the improved search operators in the territory foraging phase to enhance the ability to escape from local optima and increase convergence accuracy. The effectiveness of IMOAHA was verified through Matlab/Simulink. The results demonstrate that IMOAHA exhibits superior convergence, diversity, uniformity, and coverage of solutions across 6 test functions, outperforming 4 comparative algorithms. A Wilcoxon rank-sum test further confirmed its exceptional performance. To assess IMOAHA’s ability to solve engineering problems, an optimization model for a multi-track, multi-train urban rail traction power supply system with Supercapacitor Energy Storage Systems (SCESSs) was established, and IMOAHA was successfully applied to solving the capacity allocation problem of SCESSs, demonstrating that it is an effective tool for solving complex Multi-Objective Optimization Problems (MOOPs) in engineering domains. 展开更多
关键词 Multi-objective artificial hummingbird algorithm Tent mapping based on random variables Urban rail transit Supercapacitor energy storage systems Capacity allocation
在线阅读 下载PDF
No genetic causal relationship between smoking and acute respiratory distress syndrome: insights from Mendelian randomization and transcriptomics
19
作者 Yan Zhang Xiaotong Han +6 位作者 Maiying Fan Siyu Lu Yuteng Zeng Zhitong Zhou Xueyu Xu Yimin Zhu Xiquan Yan 《World Journal of Emergency Medicine》 2025年第5期494-496,共3页
Acute respiratory distress syndrome(ARDS)is a severe clinical condition characterized by acute respiratory failure due to widespread pulmonary inflammation and edema.The incidence of ARDS among intensive care unit(ICU... Acute respiratory distress syndrome(ARDS)is a severe clinical condition characterized by acute respiratory failure due to widespread pulmonary inflammation and edema.The incidence of ARDS among intensive care unit(ICU)patients is approximately 10%,with mortality rates ranging from 35%to 45%and exceeding 50%in severe cases.[1]Identifying and controlling risk factors for ARDS is critical for early prevention.Smoking remains a significant global public health issue,affecting one-third of adults and 40%of children through exposure to secondhand smoke.[2]In an animal study,cigarette smoke impaired lung endothelial barrier function through oxidative stress and exacerbated lipopolysaccharide-induced increases in vascular permeability in vivo.This finding is consistent with the pathological changes observed in ARDS.[3]Although many observational studies have suggested a potential link between smoking and ARDS,the causal relationship remains unclear.This study uses Mendelian randomization(MR)to explore whether smoking behavior causally influences ARDS and investigates the mechanisms by which smoking may contribute to ARDS development through transcriptomic analysis of the Gene Expression Omnibus(GEO)database. 展开更多
关键词 controlling risk factors acute respiratory failure acute respiratory distress syndrome SMOKING pulmonary inflammation lung endothelial barrier function acute respiratory distress syndrome ards mendelian randomization
暂未订购
Sample Path Large Deviations for Independent Random Variables under Sub-Linear Expectations 被引量:1
20
作者 Mingzhou XU 《Journal of Mathematical Research with Applications》 CSCD 2024年第4期541-550,共10页
In this work, the sample path large deviations for independent, identically distributed random variables under sub-linear expectations are established. The results obtained in sublinear expectation spaces extend the c... In this work, the sample path large deviations for independent, identically distributed random variables under sub-linear expectations are established. The results obtained in sublinear expectation spaces extend the corresponding ones in probability space. 展开更多
关键词 sample path large deviations independent random variables sub-linear expectation
原文传递
上一页 1 2 250 下一页 到第
使用帮助 返回顶部