Introduction: A great number of software are currently used to digitalize the patient records in order to optimize the quality of services offered to patients. The objective of this study was to evaluate the effects o...Introduction: A great number of software are currently used to digitalize the patient records in order to optimize the quality of services offered to patients. The objective of this study was to evaluate the effects of Electronic Health Records use in Burundi’s hospitals, taking into account the COVID-19 pandemic context. Methods: This was a quasi-experimental study based on difference in difference method. Ten district hospitals were included in the study, five of them had the Electronic Health Records and five of which did not yet have the Electronic Health Records. The hospital’s control group were chosen using the propensity score matching method. The period before the project’s implementation was 2014 and the period after were 2019 and 2020. Results: After 5 years of the Electronic Health Record’s implementation, the results showed an increase in outpatient consultation (70%), deliveries (more than 100%), caesarean sections (56%) and major surgeries (43%) indicators. The overall quality score of hospitals’ care had a regressive effect of 37% and the income from performance-based funding had an increase by 31%. The indicators which were affected by the context of the COVID-19 pandemic were especially outpatient consultation, caesarian section, income from performance-based funding decreased by 3%, 5% and 20% respectively. Conclusion: The effects of Electronic Health Records use are effective. As the COVID-19 pandemic impacted the hospital’s indicators negatively, the resilient strategies alongside the potential shocks are recommended.展开更多
Accounting informatization is the combination of accounting and information technology. It is a necessary measure for enterprise financial accounting management to conform to the wave of informatization. It is helpful...Accounting informatization is the combination of accounting and information technology. It is a necessary measure for enterprise financial accounting management to conform to the wave of informatization. It is helpful to enhance the competitiveness of enterprises and solve the "isolated island" phenomenon existing in accounting computerization. In view of this, the article first points out the necessity of the development of enterprise financial accounting informatization, and then expounds the main performance in the development process of enterprise financial accounting informatization, which is helpful for practitioners to understand the realization conditions of enterprise financial accounting informatization. On this basis, the article puts forward the effective countermeasures for the development of enterprise financial accounting computerization to informatization, including establishing the correct cognition and concept of enterprise financial accounting informatization;In order to provide certain reference for the research and practice of practitioners, it is necessary to upgrade and perfect the enterprise financial accounting system in two aspects.展开更多
At present, there are many problems in accounting computerization in colleges and universities, such as unreasonable class layout, lack of teachers and weak practical training, which can not adapt to social developmen...At present, there are many problems in accounting computerization in colleges and universities, such as unreasonable class layout, lack of teachers and weak practical training, which can not adapt to social development. Therefore, this paper has certain practical significance for solving the problems related to accounting computerization, training various accounting and electromechanical personnel to meet the social needs and promoting social development.展开更多
The algebraic reconstruction technique(ART),multiplicative algebraic reconstruction technique(MART),and simultaneous iterative reconstruction technique(SIRT)are computational methodologies extensively utilized within ...The algebraic reconstruction technique(ART),multiplicative algebraic reconstruction technique(MART),and simultaneous iterative reconstruction technique(SIRT)are computational methodologies extensively utilized within the field of computerized ionospheric tomography(CIT)to facilitate three-dimensional reconstruction of the ionospheric morphology.However,reconstruction accuracy elicits recurrent disputes over its practical application,and people usually attribute this issue to incomplete and uneven coverage of the measurements.The Thermosphere Ionosphere Electrodynamics General Circulation Model(TIEGCM)offers a reasonable physics-based ionospheric background and is widely utilized in ionospheric research.We use the TIEGCM simulations as the targeted ionosphere because the current measurements are far from able to realistically reproduce the ionosphere in detail.Optimized designations of satellite measurements are conducted to investigate the limiting performance of CIT methods in ionospheric reconstruction.Similar to common practice,electron density distributions from outputs of the International Reference Ionosphere(IRI)model are used as the iterative initial value in CIT applications.The outcomes suggest that despite data coverage,iterative initial conditions also play an essential role in ionospheric reconstruction.In particular,in the longitudinal sectors where the iterative initial height of the F2-layer peak electron density(hmF2)differs substantially from the background densities,none of the three CIT methods can reproduce the exact background profile.When hmF2 is close but the ionospheric F2-layer peak density(NmF2)is different between the targeted background and initial conditions,the MART performs better than the ART and SIRT,as evidenced by the correlation coefficients of MART being above 0.97 and those of ART and SIRT being below 0.85.In summary,this investigation reveals the potential uncertainties in traditional CIT reconstruction,particularly when realistic hmF2 or NmF2 values differ substantially from the initial CIT conditions.展开更多
Continuous carbon fiber reinforced silicon carbide(C/SiC)composites are often subjected to low-velocity impacts when utilized as structural materials for thermal protection.However,research on in-plane impact damage a...Continuous carbon fiber reinforced silicon carbide(C/SiC)composites are often subjected to low-velocity impacts when utilized as structural materials for thermal protection.However,research on in-plane impact damage and multiple impact damage of C/SiC composites is limited.To investigate the in-plane impact damage behavior of C/SiC composites,a drop-weight impact test method was developed for strip samples,and these results were subsequently compared with those of C/SiC composite plates.Results show that the in-plane impact behavior of C/SiC strip samples is similar to that of C/SiC composite plates.Variation of the impact load with displacement is characterized by three stages:a nearly linear stage,a severe load drop stage,and a rebound stage where displacement occurs after the impact energy exceeds its peak value.Impact damage behavior under single and multiple impacts on 2D plain and 3D needled C/SiC composites was investigated at different impact energies and durations.Crack propagation in C/SiC composites was studied by computerized tomography(CT)technique.In the 2D plain C/SiC composite,load propagation between layers is hindered during impact,leading to delamination and 90°fiber brittle fracture.The crack length perpendicular to the impact direction increases with impact energy increases,resulting in more serious 0°fiber fracture and a larger area of fiber loss.In the 3D needled C/SiC composite,load propagates between the layers during impact through the connection of needled fibers.The fibers continue to provide substantial structural support,with notable instances of fiber pull-off and debonding.Consequently,the impact resistance is superior to that of 2D plain C/SiC composite.When the 3D needled C/SiC composite undergoes two successive impacts of 1.5 J,the energy absorption efficiency of the second impact is significantly lower,accompanied by a smaller impact displacement.Moreover,the total energy absorption efficiency of these two impacts of 1.5 J is lower than that of a single 3.0 J impact.展开更多
Numerous slope failures have been reported during periods of water level fluctuations.Understanding the influence of water on the creep behavior of joints is essential for evaluating the long-term stability of slopes....Numerous slope failures have been reported during periods of water level fluctuations.Understanding the influence of water on the creep behavior of joints is essential for evaluating the long-term stability of slopes.This study focuses on the effects of drying-wetting cycles and soaking conditions on the long-term behavior of sandstone joints.A total of 12 multi-stage shear creep tests are carried out on sandstone joints subjected to varying drying-wetting cycles under both soaking and un-soaking conditions.Based on the experimental results,the influences of drying-wetting cycles as well as soaking conditions on the microstructure,shear creep displacement,strength,and failure morphologies of sandstone joints are investigated comprehensively.Results indicate that increasing drying-wetting cycles not only yields larger shear creep displacements but also leads to a negative exponential decrease in the strength of sandstone joints.Besides,soaking conditions strongly influence the creep behavior of sandstone joints.The failure strength and long-term strength of sandstone joints for soaked samples decrease by 13.6%–29.0%and 19.4%–37.5%,respectively,as compared to unsoaked samples.Furthermore,four distinct stages in the shear creep process were identified according to the results obtained from multi-stage shear creep tests and computerized tomography scans,and three creep failure modes of sandstone joints are thus determined.Finally,the influence mechanism of drying-wetting cycles and soaking conditions on the creep failure modes of sandstone joints is revealed.Drying-wetting cycles and soaking conditions diminish the influence of asperities on the shear creep behavior of joints,thereby reducing the resistance of joints to long-term deformation.展开更多
Background Schizophrenia is characterised by pervasive cognitive deficits that significantly impair daily functioning and quality of life.Pharmacological treatments have limited efficacy in addressing these deficits,h...Background Schizophrenia is characterised by pervasive cognitive deficits that significantly impair daily functioning and quality of life.Pharmacological treatments have limited efficacy in addressing these deficits,highlighting the need for adjunctive interventions like computerised cognitive training(CCT).Aims This study aimed to evaluate the effects of a 30-session CCT programme on mental well-being and cognitive performance in individuals with schizophrenia.Additionally,it assessed the usability and acceptability of CCT in this population.Methods A double-blind,randomised clinical trial was conducted with 54 participants assigned to intervention and control groups.Cognitive and mental health outcomes were assessed using validated tools such as the Depression Anxiety Stress Scale 21,the Warwick-Edinburgh Mental Wellbeing Scale and the Cambridge Neuropsychological Test Automated Battery.Usability was measured with the System Usability Scale(SUS).Assessments were conducted at baseline,post-intervention and 3 months post-follow-up.Results The CCT intervention significantly improved mental well-being,reduced stress and enhanced working memory(paired associate learning,spatial working memory and spatial span)compared with controls.However,no significant effects were observed for anxiety,depression or executive function.Usability scores were high(SUS=83.51),and compliance rates were strong(92.7%),indicating favourable participant engagement.Conclusion CCT demonstrated potential as an adjunctive treatment for schizophrenia,with significant improvements in targeted cognitive and mental health domains.The high usability and compliance rates support its feasibility for broader implementation.Further research is needed to optimise protocols and explore long-term benefits.CCT offers a promising approach to addressing mental health and cognitive challenges in schizophrenia,particularly for stress and working memory.Its usability and acceptability suggest it could be seamlessly integrated into clinical practice.展开更多
BACKGROUND Underdiagnosis of peripheral arterial disease results in inadequate treatment and more serious consequences.Hence,clinicians have focused on early diagnosis and treatment.AIM To investigate the effectivenes...BACKGROUND Underdiagnosis of peripheral arterial disease results in inadequate treatment and more serious consequences.Hence,clinicians have focused on early diagnosis and treatment.AIM To investigate the effectiveness of the combination of doppler ultrasonography(DUS),three-dimensional dynamic contrast-enhanced magnetic resonance an-giography(CE-MRA),and CT angiography(CTA)in assessing lower extremity arterial disease in diabetes mellitus(DM).METHODS This study retrospectively analyzed the imaging and clinical data of 116 patients diagnosed with DM complicated with lower extremity vascular diseases from January 2021 to June 2023.All patients underwent unilateral or bilateral DUS,CTA,and CE-MRA as well as invasive digital subtraction angiography(DSA).The application values of DUS,CE-MRA,and CTA were compared.RESULTS A total of 152 lower extremity arteries in the 116 patients were graded following the classification of vascular branches.The Kappa values between DUS and DSA were 0.780,0.755,and 0.806 for diagnosing moderate stenosis and 0.484,0.699,and 0.449 for severe stenosis of grade 1 arteries,grade 2 arteries,and grade 3 arteries,respectively.The Kappa values between CE-MRA and DSA were 0.784,0.814,and 0.835 for diagnosing moderate stenosis and 0.694,0.748,and 0.606 for severe stenosis of grade 1 arteries,grade 2 arteries,and grade 3 arteries,respectively.The Kappa values between CTA and DSA were 0.900,0.858,and 0.878 for diagnosing moderate stenosis and 0.882,0.823,and 0.756 for severe stenosis of grade 1 arteries,grade 2 arteries,and grade 3 arteries,respectively.CONCLUSION DUS,CE-MRA,and CTA demonstrated comparable accuracy in diagnosing lower extremity arterial disease in DM,and the consistency between CTA and DSA diagnoses was higher than the other two imaging methods.展开更多
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
Disintegrated dolomite slope and tunnel disasters occur frequently due to poor water stability of disintegrated dolomite,primarily in a form of seepage failure.For engineering purposes,it is critical to determine the ...Disintegrated dolomite slope and tunnel disasters occur frequently due to poor water stability of disintegrated dolomite,primarily in a form of seepage failure.For engineering purposes,it is critical to determine the seepage properties of disintegrated dolomite within the strata.However,conventional experimental methods are time-consuming and expensive and may not be effective in investigating seepage characteristics due to the heterogeneity of disintegrated dolomite.In this study,pore network model(PNM)was established by the computerized tomography(CT)scanning technology to characterize the pores.Meanwhile,the seepage and coefficient of permeability under different inlet stress conditions based on the accurate pore model were realized by linking the commercial image processing software Avizo with the commercial multi-physics modeling package Comsol.The results show that the porosities of severely and completely disintegrated dolomites are 29.17% and 45.37%,respectively.The grade of pore development increases with disintegration grade,which facilitates seepage failure.Severely and completely disintegrated dolomites have the coefficients of permeability of 9.67×10^(-7) m/s and 1.61×10^(-6) m/s,respectively.Under conventional conditions,severely and completely disintegrated dolomites undergo seepage failure above a pressure difference of 6×10^(3) Pa and 5×10^(3) Pa,respectively.These results are consistent with both in situ water pressure tests in the borehole and laboratory tests with the constant-head method,demonstrating that CT scanning is an effective method for observing fractures and pores in disintegrated dolomite for seepage evaluation.展开更多
Double perovskite matrix materials have recently attracted considerable interest due to their structural flexibility,ease of doping,and excellent thermal stability.While photoluminescence(PL)studies of rare-earth-dope...Double perovskite matrix materials have recently attracted considerable interest due to their structural flexibility,ease of doping,and excellent thermal stability.While photoluminescence(PL)studies of rare-earth-doped double perovskites are common,research on their thermoluminescence(TL)properties is less extensive.This study synthesized a series of Y_(2-x)Sm_(x)MgTiO_(6)(0≤x≤0.1)samples using a high-temperature solid-state method.X-ray diffraction(XRD)analysis confirmed a monoclinic crystal structure(space group P2_(1)∕n),with Sm^(3+)ions substituting for Y^(3+)ions in Y_(2)MgTiO_(6).The PL results indicated that the optimal doping concentration was Y_(1.95)Sm_(0.05)MgTiO_(6),exhibiting emission peaks at 568,605,652,and 715 nm under 409 nm blue light excitation.The TL measurements for different doping concentrations showed that the Y_(1.98)Sm_(0.02)MgTiO_(6)phosphors exhibited the strongest TL signals.The TL peaks observed at 530 and 610 K correspond to defects in the matrix and Sm^(3+)dopants,respectively.The T_(m)-T_(stop)analysis revealed that the TL curve of Y_(1.98)Sm_(0.02)MgTiO_(6)phosphors was a superposition of seven peaks.Computerized glow curve deconvolution(CGCD)was performed on the TL of the sample according to the results of three-dimensional thermoluminescence spectra(3D-TL)and T_(m)-T_(stop),and the trap depths in the sample were estimated to range from 0.69 to 1.49 eV.Additionally,the lifetimes of each overlapping peak were calculated using the fitting parameters.Furthermore,the dose-response test showed that the saturation dose of the sample was high(9956 Gy).Therefore,this material can serve as a thermoluminescent dosimeter for high-dose measurements.The saturation dose for the lowest-temperature overlapping peak was 102 Gy,which correlated with its specific energy-level lifetime,whereas the other overlapping peaks also exhibited favorable linear relationships.展开更多
The effects of applied tensile strain on the coherent α_2→O-phase transformation in Ti-Al-Nb alloys are explored bycomputer simulation using a phase-field method. The focus is on the influence of the applied strain ...The effects of applied tensile strain on the coherent α_2→O-phase transformation in Ti-Al-Nb alloys are explored bycomputer simulation using a phase-field method. The focus is on the influence of the applied strain direction onthe microstructure and volume fraction of the O-phase precipitates. It is found that altering applied strain directioncan modify microstructure of Ti-25Al-10～12Nb (at. pct) alloy during α_2→O-phase transformation effectively andfull laminate microstructure in the Ti-25Al-10Nb (at. pct) alloy can be realized by an applied strain only along thedirection 30°away from the α_2 phase <1010> in magnitude equivalent to the stress-free transformation strain. Thesimulation also shows that not only the magnitude of applied strain but also the applied strain direction influencesthe O-phase volume fraction and the effect of strain direction on the volume fraction is up to 25%.展开更多
The process of constructing a database of average cross-sections in Chinese proximal femurs is described. The main goal of creating the database is for designing hip stems for Chinese patients. Methods for constructin...The process of constructing a database of average cross-sections in Chinese proximal femurs is described. The main goal of creating the database is for designing hip stems for Chinese patients. Methods for constructing the database are introduced. According to some existing software and programs developed by the authors, a database of average cross-sections in Chinese proximal femurs was built based on CT images of eighty femur-specimens. 3-D shape of a patient's proximal femurs can be reconstructed according to the database and X-ray radiographs. Theoretical analyses and results of clinical application indicate that the database can be used to design hip stems for Chinese patients.展开更多
Describes a new computer program (Regress-3D) to simulate the regression of complex 3D grain cavity and calculate the burning surface area. It has a large region of applicability in solid rocket motor design and has...Describes a new computer program (Regress-3D) to simulate the regression of complex 3D grain cavity and calculate the burning surface area. It has a large region of applicability in solid rocket motor design and has made new improvements compared with other available codes. User can easily and rapidly build his initial grain shapes and then obtain geometric information of his design. Considering with the calclulting results, redesigning can be performed as desire until reaching at the satisfied result. Advantages and disadvantages of this method are also discussed.展开更多
Flotation technology design includes data calculating and flowsheet drawing. To implement data calculating, relative matrix is used to express the flotation flowsheet, special mineral processing models and optimizing ...Flotation technology design includes data calculating and flowsheet drawing. To implement data calculating, relative matrix is used to express the flotation flowsheet, special mineral processing models and optimizing mathematical models have been used. The “binary tree” principle has been used to demonstrate the flotation flowsheet structure, and the coding principle according to the order of preorder traversing to “binary tree” is determined for the implement of the flotation flowsheet drawing. As a result, the computerization of flotation technology design was completed. Design principles, models and application of the software are discussed in this paper.展开更多
The development of computer technologies, specialized software and Interact deepens the connection between them and the chess. Its relatedness increases both on educational and training and on competitive level. The c...The development of computer technologies, specialized software and Interact deepens the connection between them and the chess. Its relatedness increases both on educational and training and on competitive level. The contemporary training of adolescents players has very unified character and a comprehensive innovation methodology would be applicable to players, who are different at strength and age. Increasing the massiveness in junior chess implies a higher quality of coaching work, related to the use of IT innovation and modem software chess products. HYPOTHESIS： The use of computer innovation would increase the effectiveness of the educational and training process in chess. OBJECTIVE： To prove the improvement of the effectiveness of the educational and training process through the development and testing of innovative education model for adolescents players with predominantly using of specialized chess software analytical module and web-based learning. METHODOLOGY： Pedagogical experiment, expert evaluation, questionnaire survey, sports pedagogical testing and mathematical and statistical methods. CONCLUSION： The experimental methodology for the training of adolescents players by using specialized chess software, internet and web-based forms of training leads to higher efficiency of the training sessions and higher results, compared to traditional ones.展开更多
文摘Introduction: A great number of software are currently used to digitalize the patient records in order to optimize the quality of services offered to patients. The objective of this study was to evaluate the effects of Electronic Health Records use in Burundi’s hospitals, taking into account the COVID-19 pandemic context. Methods: This was a quasi-experimental study based on difference in difference method. Ten district hospitals were included in the study, five of them had the Electronic Health Records and five of which did not yet have the Electronic Health Records. The hospital’s control group were chosen using the propensity score matching method. The period before the project’s implementation was 2014 and the period after were 2019 and 2020. Results: After 5 years of the Electronic Health Record’s implementation, the results showed an increase in outpatient consultation (70%), deliveries (more than 100%), caesarean sections (56%) and major surgeries (43%) indicators. The overall quality score of hospitals’ care had a regressive effect of 37% and the income from performance-based funding had an increase by 31%. The indicators which were affected by the context of the COVID-19 pandemic were especially outpatient consultation, caesarian section, income from performance-based funding decreased by 3%, 5% and 20% respectively. Conclusion: The effects of Electronic Health Records use are effective. As the COVID-19 pandemic impacted the hospital’s indicators negatively, the resilient strategies alongside the potential shocks are recommended.
文摘Accounting informatization is the combination of accounting and information technology. It is a necessary measure for enterprise financial accounting management to conform to the wave of informatization. It is helpful to enhance the competitiveness of enterprises and solve the "isolated island" phenomenon existing in accounting computerization. In view of this, the article first points out the necessity of the development of enterprise financial accounting informatization, and then expounds the main performance in the development process of enterprise financial accounting informatization, which is helpful for practitioners to understand the realization conditions of enterprise financial accounting informatization. On this basis, the article puts forward the effective countermeasures for the development of enterprise financial accounting computerization to informatization, including establishing the correct cognition and concept of enterprise financial accounting informatization;In order to provide certain reference for the research and practice of practitioners, it is necessary to upgrade and perfect the enterprise financial accounting system in two aspects.
文摘At present, there are many problems in accounting computerization in colleges and universities, such as unreasonable class layout, lack of teachers and weak practical training, which can not adapt to social development. Therefore, this paper has certain practical significance for solving the problems related to accounting computerization, training various accounting and electromechanical personnel to meet the social needs and promoting social development.
基金supported by the National Key R&D Program of China (Grant No. 2022YFF0503702)the National Natural Science Foundation of China (Grant No. 42074186)
文摘The algebraic reconstruction technique(ART),multiplicative algebraic reconstruction technique(MART),and simultaneous iterative reconstruction technique(SIRT)are computational methodologies extensively utilized within the field of computerized ionospheric tomography(CIT)to facilitate three-dimensional reconstruction of the ionospheric morphology.However,reconstruction accuracy elicits recurrent disputes over its practical application,and people usually attribute this issue to incomplete and uneven coverage of the measurements.The Thermosphere Ionosphere Electrodynamics General Circulation Model(TIEGCM)offers a reasonable physics-based ionospheric background and is widely utilized in ionospheric research.We use the TIEGCM simulations as the targeted ionosphere because the current measurements are far from able to realistically reproduce the ionosphere in detail.Optimized designations of satellite measurements are conducted to investigate the limiting performance of CIT methods in ionospheric reconstruction.Similar to common practice,electron density distributions from outputs of the International Reference Ionosphere(IRI)model are used as the iterative initial value in CIT applications.The outcomes suggest that despite data coverage,iterative initial conditions also play an essential role in ionospheric reconstruction.In particular,in the longitudinal sectors where the iterative initial height of the F2-layer peak electron density(hmF2)differs substantially from the background densities,none of the three CIT methods can reproduce the exact background profile.When hmF2 is close but the ionospheric F2-layer peak density(NmF2)is different between the targeted background and initial conditions,the MART performs better than the ART and SIRT,as evidenced by the correlation coefficients of MART being above 0.97 and those of ART and SIRT being below 0.85.In summary,this investigation reveals the potential uncertainties in traditional CIT reconstruction,particularly when realistic hmF2 or NmF2 values differ substantially from the initial CIT conditions.
基金Aeronautical Science Foundation of China(2021Z057053001)。
文摘Continuous carbon fiber reinforced silicon carbide(C/SiC)composites are often subjected to low-velocity impacts when utilized as structural materials for thermal protection.However,research on in-plane impact damage and multiple impact damage of C/SiC composites is limited.To investigate the in-plane impact damage behavior of C/SiC composites,a drop-weight impact test method was developed for strip samples,and these results were subsequently compared with those of C/SiC composite plates.Results show that the in-plane impact behavior of C/SiC strip samples is similar to that of C/SiC composite plates.Variation of the impact load with displacement is characterized by three stages:a nearly linear stage,a severe load drop stage,and a rebound stage where displacement occurs after the impact energy exceeds its peak value.Impact damage behavior under single and multiple impacts on 2D plain and 3D needled C/SiC composites was investigated at different impact energies and durations.Crack propagation in C/SiC composites was studied by computerized tomography(CT)technique.In the 2D plain C/SiC composite,load propagation between layers is hindered during impact,leading to delamination and 90°fiber brittle fracture.The crack length perpendicular to the impact direction increases with impact energy increases,resulting in more serious 0°fiber fracture and a larger area of fiber loss.In the 3D needled C/SiC composite,load propagates between the layers during impact through the connection of needled fibers.The fibers continue to provide substantial structural support,with notable instances of fiber pull-off and debonding.Consequently,the impact resistance is superior to that of 2D plain C/SiC composite.When the 3D needled C/SiC composite undergoes two successive impacts of 1.5 J,the energy absorption efficiency of the second impact is significantly lower,accompanied by a smaller impact displacement.Moreover,the total energy absorption efficiency of these two impacts of 1.5 J is lower than that of a single 3.0 J impact.
基金financial support from the National Natural Science Foundation of China(Grant Nos.52479108,52408391)the Fundamental Research Funds for the Central Universities(2042024kf0032)+1 种基金the Postdoctoral Fellowship Program(Grade C)of China Postdoctoral Science Foundation(Grant No.GZC20241283)the Natural Science Foundation of Hubei Province,China(No.2024AFB160)。
文摘Numerous slope failures have been reported during periods of water level fluctuations.Understanding the influence of water on the creep behavior of joints is essential for evaluating the long-term stability of slopes.This study focuses on the effects of drying-wetting cycles and soaking conditions on the long-term behavior of sandstone joints.A total of 12 multi-stage shear creep tests are carried out on sandstone joints subjected to varying drying-wetting cycles under both soaking and un-soaking conditions.Based on the experimental results,the influences of drying-wetting cycles as well as soaking conditions on the microstructure,shear creep displacement,strength,and failure morphologies of sandstone joints are investigated comprehensively.Results indicate that increasing drying-wetting cycles not only yields larger shear creep displacements but also leads to a negative exponential decrease in the strength of sandstone joints.Besides,soaking conditions strongly influence the creep behavior of sandstone joints.The failure strength and long-term strength of sandstone joints for soaked samples decrease by 13.6%–29.0%and 19.4%–37.5%,respectively,as compared to unsoaked samples.Furthermore,four distinct stages in the shear creep process were identified according to the results obtained from multi-stage shear creep tests and computerized tomography scans,and three creep failure modes of sandstone joints are thus determined.Finally,the influence mechanism of drying-wetting cycles and soaking conditions on the creep failure modes of sandstone joints is revealed.Drying-wetting cycles and soaking conditions diminish the influence of asperities on the shear creep behavior of joints,thereby reducing the resistance of joints to long-term deformation.
基金supported by a grant from University of Social Welfare and Rehabilitation Sciences for the research expenses.
文摘Background Schizophrenia is characterised by pervasive cognitive deficits that significantly impair daily functioning and quality of life.Pharmacological treatments have limited efficacy in addressing these deficits,highlighting the need for adjunctive interventions like computerised cognitive training(CCT).Aims This study aimed to evaluate the effects of a 30-session CCT programme on mental well-being and cognitive performance in individuals with schizophrenia.Additionally,it assessed the usability and acceptability of CCT in this population.Methods A double-blind,randomised clinical trial was conducted with 54 participants assigned to intervention and control groups.Cognitive and mental health outcomes were assessed using validated tools such as the Depression Anxiety Stress Scale 21,the Warwick-Edinburgh Mental Wellbeing Scale and the Cambridge Neuropsychological Test Automated Battery.Usability was measured with the System Usability Scale(SUS).Assessments were conducted at baseline,post-intervention and 3 months post-follow-up.Results The CCT intervention significantly improved mental well-being,reduced stress and enhanced working memory(paired associate learning,spatial working memory and spatial span)compared with controls.However,no significant effects were observed for anxiety,depression or executive function.Usability scores were high(SUS=83.51),and compliance rates were strong(92.7%),indicating favourable participant engagement.Conclusion CCT demonstrated potential as an adjunctive treatment for schizophrenia,with significant improvements in targeted cognitive and mental health domains.The high usability and compliance rates support its feasibility for broader implementation.Further research is needed to optimise protocols and explore long-term benefits.CCT offers a promising approach to addressing mental health and cognitive challenges in schizophrenia,particularly for stress and working memory.Its usability and acceptability suggest it could be seamlessly integrated into clinical practice.
文摘BACKGROUND Underdiagnosis of peripheral arterial disease results in inadequate treatment and more serious consequences.Hence,clinicians have focused on early diagnosis and treatment.AIM To investigate the effectiveness of the combination of doppler ultrasonography(DUS),three-dimensional dynamic contrast-enhanced magnetic resonance an-giography(CE-MRA),and CT angiography(CTA)in assessing lower extremity arterial disease in diabetes mellitus(DM).METHODS This study retrospectively analyzed the imaging and clinical data of 116 patients diagnosed with DM complicated with lower extremity vascular diseases from January 2021 to June 2023.All patients underwent unilateral or bilateral DUS,CTA,and CE-MRA as well as invasive digital subtraction angiography(DSA).The application values of DUS,CE-MRA,and CTA were compared.RESULTS A total of 152 lower extremity arteries in the 116 patients were graded following the classification of vascular branches.The Kappa values between DUS and DSA were 0.780,0.755,and 0.806 for diagnosing moderate stenosis and 0.484,0.699,and 0.449 for severe stenosis of grade 1 arteries,grade 2 arteries,and grade 3 arteries,respectively.The Kappa values between CE-MRA and DSA were 0.784,0.814,and 0.835 for diagnosing moderate stenosis and 0.694,0.748,and 0.606 for severe stenosis of grade 1 arteries,grade 2 arteries,and grade 3 arteries,respectively.The Kappa values between CTA and DSA were 0.900,0.858,and 0.878 for diagnosing moderate stenosis and 0.882,0.823,and 0.756 for severe stenosis of grade 1 arteries,grade 2 arteries,and grade 3 arteries,respectively.CONCLUSION DUS,CE-MRA,and CTA demonstrated comparable accuracy in diagnosing lower extremity arterial disease in DM,and the consistency between CTA and DSA diagnoses was higher than the other two imaging methods.
基金Supported by Fuzhou Science and Technology Plan Project,No.2023-S-028.
文摘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.
基金supported by the National Natural Science Foundation of China(Grant No.42162026)the Basic Research Program in Yunnan Province,China(Grant No.202401AT070328)the Young Talents Project of“Xingdian Talent Support Program"in Yunnan Province,China(Grant No.YNWR-QNBJ-2020-019).
文摘Disintegrated dolomite slope and tunnel disasters occur frequently due to poor water stability of disintegrated dolomite,primarily in a form of seepage failure.For engineering purposes,it is critical to determine the seepage properties of disintegrated dolomite within the strata.However,conventional experimental methods are time-consuming and expensive and may not be effective in investigating seepage characteristics due to the heterogeneity of disintegrated dolomite.In this study,pore network model(PNM)was established by the computerized tomography(CT)scanning technology to characterize the pores.Meanwhile,the seepage and coefficient of permeability under different inlet stress conditions based on the accurate pore model were realized by linking the commercial image processing software Avizo with the commercial multi-physics modeling package Comsol.The results show that the porosities of severely and completely disintegrated dolomites are 29.17% and 45.37%,respectively.The grade of pore development increases with disintegration grade,which facilitates seepage failure.Severely and completely disintegrated dolomites have the coefficients of permeability of 9.67×10^(-7) m/s and 1.61×10^(-6) m/s,respectively.Under conventional conditions,severely and completely disintegrated dolomites undergo seepage failure above a pressure difference of 6×10^(3) Pa and 5×10^(3) Pa,respectively.These results are consistent with both in situ water pressure tests in the borehole and laboratory tests with the constant-head method,demonstrating that CT scanning is an effective method for observing fractures and pores in disintegrated dolomite for seepage evaluation.
基金supported by the Zhanjiang Science and Technology Plan Project(No.2022A05022)Science and Technology Development Special Project of Zhanjiang(No.2023A21616)Research Project of Guangdong Ocean University(No.060302112102).
文摘Double perovskite matrix materials have recently attracted considerable interest due to their structural flexibility,ease of doping,and excellent thermal stability.While photoluminescence(PL)studies of rare-earth-doped double perovskites are common,research on their thermoluminescence(TL)properties is less extensive.This study synthesized a series of Y_(2-x)Sm_(x)MgTiO_(6)(0≤x≤0.1)samples using a high-temperature solid-state method.X-ray diffraction(XRD)analysis confirmed a monoclinic crystal structure(space group P2_(1)∕n),with Sm^(3+)ions substituting for Y^(3+)ions in Y_(2)MgTiO_(6).The PL results indicated that the optimal doping concentration was Y_(1.95)Sm_(0.05)MgTiO_(6),exhibiting emission peaks at 568,605,652,and 715 nm under 409 nm blue light excitation.The TL measurements for different doping concentrations showed that the Y_(1.98)Sm_(0.02)MgTiO_(6)phosphors exhibited the strongest TL signals.The TL peaks observed at 530 and 610 K correspond to defects in the matrix and Sm^(3+)dopants,respectively.The T_(m)-T_(stop)analysis revealed that the TL curve of Y_(1.98)Sm_(0.02)MgTiO_(6)phosphors was a superposition of seven peaks.Computerized glow curve deconvolution(CGCD)was performed on the TL of the sample according to the results of three-dimensional thermoluminescence spectra(3D-TL)and T_(m)-T_(stop),and the trap depths in the sample were estimated to range from 0.69 to 1.49 eV.Additionally,the lifetimes of each overlapping peak were calculated using the fitting parameters.Furthermore,the dose-response test showed that the saturation dose of the sample was high(9956 Gy).Therefore,this material can serve as a thermoluminescent dosimeter for high-dose measurements.The saturation dose for the lowest-temperature overlapping peak was 102 Gy,which correlated with its specific energy-level lifetime,whereas the other overlapping peaks also exhibited favorable linear relationships.
文摘The effects of applied tensile strain on the coherent α_2→O-phase transformation in Ti-Al-Nb alloys are explored bycomputer simulation using a phase-field method. The focus is on the influence of the applied strain direction onthe microstructure and volume fraction of the O-phase precipitates. It is found that altering applied strain directioncan modify microstructure of Ti-25Al-10～12Nb (at. pct) alloy during α_2→O-phase transformation effectively andfull laminate microstructure in the Ti-25Al-10Nb (at. pct) alloy can be realized by an applied strain only along thedirection 30°away from the α_2 phase <1010> in magnitude equivalent to the stress-free transformation strain. Thesimulation also shows that not only the magnitude of applied strain but also the applied strain direction influencesthe O-phase volume fraction and the effect of strain direction on the volume fraction is up to 25%.
文摘The process of constructing a database of average cross-sections in Chinese proximal femurs is described. The main goal of creating the database is for designing hip stems for Chinese patients. Methods for constructing the database are introduced. According to some existing software and programs developed by the authors, a database of average cross-sections in Chinese proximal femurs was built based on CT images of eighty femur-specimens. 3-D shape of a patient's proximal femurs can be reconstructed according to the database and X-ray radiographs. Theoretical analyses and results of clinical application indicate that the database can be used to design hip stems for Chinese patients.
文摘Describes a new computer program (Regress-3D) to simulate the regression of complex 3D grain cavity and calculate the burning surface area. It has a large region of applicability in solid rocket motor design and has made new improvements compared with other available codes. User can easily and rapidly build his initial grain shapes and then obtain geometric information of his design. Considering with the calclulting results, redesigning can be performed as desire until reaching at the satisfied result. Advantages and disadvantages of this method are also discussed.
文摘Flotation technology design includes data calculating and flowsheet drawing. To implement data calculating, relative matrix is used to express the flotation flowsheet, special mineral processing models and optimizing mathematical models have been used. The “binary tree” principle has been used to demonstrate the flotation flowsheet structure, and the coding principle according to the order of preorder traversing to “binary tree” is determined for the implement of the flotation flowsheet drawing. As a result, the computerization of flotation technology design was completed. Design principles, models and application of the software are discussed in this paper.
文摘The development of computer technologies, specialized software and Interact deepens the connection between them and the chess. Its relatedness increases both on educational and training and on competitive level. The contemporary training of adolescents players has very unified character and a comprehensive innovation methodology would be applicable to players, who are different at strength and age. Increasing the massiveness in junior chess implies a higher quality of coaching work, related to the use of IT innovation and modem software chess products. HYPOTHESIS： The use of computer innovation would increase the effectiveness of the educational and training process in chess. OBJECTIVE： To prove the improvement of the effectiveness of the educational and training process through the development and testing of innovative education model for adolescents players with predominantly using of specialized chess software analytical module and web-based learning. METHODOLOGY： Pedagogical experiment, expert evaluation, questionnaire survey, sports pedagogical testing and mathematical and statistical methods. CONCLUSION： The experimental methodology for the training of adolescents players by using specialized chess software, internet and web-based forms of training leads to higher efficiency of the training sessions and higher results, compared to traditional ones.
