The control effects of different occurrence faults on oil and gas accumulation and distribution in the outer slope area of oil and gas reservoirs were studied taking the south-central Wen’an slope of the Jizhong depr...The control effects of different occurrence faults on oil and gas accumulation and distribution in the outer slope area of oil and gas reservoirs were studied taking the south-central Wen’an slope of the Jizhong depression in the Bohai Bay Basin as an example.Based on 3D seismic data and the distribution of oil and water,the controlling differences between consequent fault and antithetic fault were analyzed and compared from the formation and evolution rule of faults and the formation mechanism of fault traps,including development positions of the consequent fault traps and antithetic fault traps,oil and gas distribution horizon adjusted by fault and formation period of fault traps.The differences between consequent faults and antithetic faults in controlling reservoirs have three main aspects:(1)Consequent fault traps and antithetic fault traps are in different positions,the consequent fault traps are at the segmented growing point in the hanging wall of"hard-linkage"faults,while the antithetic fault traps are developed in the position with the largest throw in the footwall because of tilting action;(2)The two kinds of faults result in different oil and gas distribution vertically,oil and gas adjusted by consequent faults is distributed in a single layer or multi-layers,while oil and gas adjusted by antithetic faults occur in single layers;(3)The two kinds of fault traps are formed in different periods,the consequent fault traps are formed at the time when the related faults enter the stage of"hard-linkage",while the antithetic fault traps are formed at the beginning of the fault active period.展开更多
Silica-coated carbonyl iron particles （CIPs） are fabricated with the Stober method to improve their heat-resistance and wave-aSsorption properties. The morphology, heat-resistance, electromagnetic properties and mic...Silica-coated carbonyl iron particles （CIPs） are fabricated with the Stober method to improve their heat-resistance and wave-aSsorption properties. The morphology, heat-resistance, electromagnetic properties and microwave absorption of raw-CIPs and silica-coated CIPs are investigated using a scanning electron microscope, an energy dispersive spectrometer, a thermal-gravimetric analyzer, and a network analyzer. The results show that the heat-resistance of silica-coated CIPs is better than that of raw CIFs. The reflection losses exceeding -lOdB of silica-coated CIPs are obtained in the frequency range 9.5-12.4 GHz for the absorber thickness of 2.3 mm, and the same reflection losses of uncoated CIPs reach the data in the lower frequency range for the same thickness. The enhanced microwave absorption of silica-coated CIPs can be ascribed to the combination of proper electromagnetic impedance match and the decrease of dielectric permittivity.展开更多
The journal Chemical Research in Chinese Universities is a comprehensive academic journal in the field of chemistry,published bimonthly since 1984.The journal publishes research articles,letters/communications and rev...The journal Chemical Research in Chinese Universities is a comprehensive academic journal in the field of chemistry,published bimonthly since 1984.The journal publishes research articles,letters/communications and reviews written by faculty members,researchers and postgraduates in universities,colleges and research institutes all over China and overseas.It reports the latest and the most creative results of important fundamental research in all aspects of chemistry and of developments with significant consequences across sub-disciplines.This journal is sponsored by Jilin University and mandated by the Ministry of Education of P.R.China.展开更多
The journal Chemical Research in Chinese Universities is a comprehensive academic journal in the field of chemistry,published bimonthly since 1984.The journal publishes research articles,letters/communications and rev...The journal Chemical Research in Chinese Universities is a comprehensive academic journal in the field of chemistry,published bimonthly since 1984.The journal publishes research articles,letters/communications and reviews written by faculty members,researchers and postgraduates in universities,colleges and research institutes all over China and overseas.It reports the latest and the most creative results of important fundamental research in all aspects of chemistry and of developments with significant consequences across sub-disciplines.This journal is sponsored by Jilin University and mandated by the Ministry of Education of P.R.China.展开更多
To the editor:Nurses play a vital role in healthcare by providing direct medical care to patients,and their mental well-being significantly impacts the quality of service and patient satisfaction.^(1)Ruminative thinki...To the editor:Nurses play a vital role in healthcare by providing direct medical care to patients,and their mental well-being significantly impacts the quality of service and patient satisfaction.^(1)Ruminative thinking involves repetitive thoughts about negative feelings,their causes and consequences.This common psychological behaviour innurses can significantly impact their self-evaluation and result in feelings of worthlessness.展开更多
The external draft of Harmonized Common Structural Rules(CSR-H) for Bulk Carriers and Oil Tankers has been released for external review. Based on a consistent methodology at the adoption of the current CSR, CSR-H aims...The external draft of Harmonized Common Structural Rules(CSR-H) for Bulk Carriers and Oil Tankers has been released for external review. Based on a consistent methodology at the adoption of the current CSR, CSR-H aims to be in compliance with the IMO GBS where GBS functional requirements fall within the scope, and the safety level is equivalent to or higher than the current CSR criteria. In this paper, by consequence assessment on a 320k VLCC, a 163k Suezmax tanker, a 115k Aframax tanker, a 76k Panamax tanker and a 48k MR tanker, the results of the comparison on the structural scantlings to CSR, the evaluation on the increasing of steel weight and some critical technique issues are discussed.展开更多
This paper determines a delta inference operator C based on the notion of reasonable consequence of Adams′ system and studies its properties. It shows another approach to study inductive and probabilistic reasoning.
Oil spill-induced vapor cloud explosions in a confined space can cause catastrophic consequences.In this work,investigation was conducted on the catastrophic pipeline leak,oil spill,and the resulting vapor cloud explo...Oil spill-induced vapor cloud explosions in a confined space can cause catastrophic consequences.In this work,investigation was conducted on the catastrophic pipeline leak,oil spill,and the resulting vapor cloud explosion accident occurring in China in 2013 by modeling analysis,field surveys,and numerical simulations.The total amount of the spilled oil was up to2044.4 m3 due to improper disposal.The long residence time of the oil remaining in a confined space permitted the formation of explosive mixtures and caused the vapor cloud explosion.A numerical model was developed to estimate the consequence of the explosion based on volatilization testing results.The results show that the death-leading zone and the glass-breaking zone could be 18 m and 92 m,respectively,which are consistent with the field investigation.The severity of the explosion is related to the amount of the oil spill,properties of oil,and volatilization time.It is recommended that a comprehensive risk assessment be conducted to analyze the possible consequences upon oil spilling into a confined space.Prompt collection and ventilation measures should be taken immediately after the spill occurs to reduce the time for oil volatilization and prevent the mixture from reaching its explosive limit.展开更多
Nonextensive statistics in a blast-wave model is implemented to describe the identified hadron production in relativistic p+p and nucleus-nucleus collisions.Incorporating the core and corona components within the TBW ...Nonextensive statistics in a blast-wave model is implemented to describe the identified hadron production in relativistic p+p and nucleus-nucleus collisions.Incorporating the core and corona components within the TBW formalism allows us to describe simultaneously some of the major observations in hadronic observables at the Relativistic Heavy-Ion Collider(RHIC):the amount of constituent quark scaling(NCQ),the large radial and elliptic flow,the effect of gluon saturation,and the suppression of hadron production at high transverse momentum(p_(T))due to jet quenching.In this formalism,the NCQ scaling at the RHIC appears as a consequence of a non-equilibrium process.Our study also provides concise reference distributions with a leastχ^(2) fit of the available experimental data for future experiments and models.展开更多
Electronic charge of molecules can move on time scales when the nuclei stand practically still,from few hundreds of attoseconds to few femtoseconds.This ultrafast process is called“charge migration”.A typical conseq...Electronic charge of molecules can move on time scales when the nuclei stand practically still,from few hundreds of attoseconds to few femtoseconds.This ultrafast process is called“charge migration”.A typical consequence is rapid change of electronic dipole,which points to the center of charge.Corresponding linear(one-dimensional,1D)and planar(2D)dipolar motions have already been well documented.Here we construct the first case of charge migration which causes chiral 3D dipolar motion,specifically along a helix about oriented iodo-acetylene(HCCI).Quantum dynamics simulations show that this can be induced by well-designed laser pulses.展开更多
Dear editor,Traumatic orbital haemorrhage is an unfortunate complication with potential vision-threatening consequences.[1-3]The collection of blood can occur anywhere along the potential free orbital spaces,[4]but th...Dear editor,Traumatic orbital haemorrhage is an unfortunate complication with potential vision-threatening consequences.[1-3]The collection of blood can occur anywhere along the potential free orbital spaces,[4]but the subperiosteal collection of the blood is an important clinical variant where careful and timely intervention can give commendable rewards to the surgeon as well as to the patient.[1,2]Subperiosteal hematoma could be traumatic or non-traumatic,in turns,the non-traumatic cases may be due to bleeding tendency as in cases of leukaemia.展开更多
Background The impact of the COVID-19 pandemic on the population’s mental health is vital for informing public health policy and decision-making.However,information on mental health-related healthcare service utilisa...Background The impact of the COVID-19 pandemic on the population’s mental health is vital for informing public health policy and decision-making.However,information on mental health-related healthcare service utilisation trends beyond the first year of the pandemic is limited.Aims We examined mental health-related healthcare service utilisation patterns and psychotropic drug dispensations in British Columbia,Canada,during the COVID-19 pandemic compared with the prepandemic period.Methods We conducted a retrospective population-based secondary analysis using administrative health data to capture outpatient physician visits,emergency department visits,hospital admissions and psychotropic drug dispensations.We examined time trends of mental health-related healthcare service utilisation and psychotropic drug dispensations between January to December 2019(prepandemic period)and January 2020 to December 2021(pandemic period).In addition,we calculated age-standardised rates and rate ratios to compare mental health-related healthcare service utilisation before and during the first two years of the COVID-19 pandemic,stratified by year,sex,age and condition.Results By late 2020,except for emergency department visits,utilisation of healthcare services recovered to prepandemic levels.Between 2019 and 2021,the monthly average rate for overall mental health-related outpatient physician visits,emergency department visits and psychotropic drug dispensations increased significantly by 24%,5%and 8%,respectively.Notable and statistically significant increases were observed among 10–14 year-olds(44%in outpatient physician visits,30%in emergency department visits,55%in hospital admissions and 35%in psychotropic drug dispensations)and 15–19 year-olds(45%in outpatient physician visits,14%in emergency department visits,18%in hospital admissions and 34%in psychotropic drug dispensations).Additionally,these increases were more prominent among females than males,with some variation for specific mental health-related conditions.Conclusions The increase in mental health-related healthcare service utilisation and psychotropic drug dispensations during the pandemic likely reflects significant societal consequences of both the pandemic and pandemic management measures.Recovery efforts in British Columbia should consider these findings,especially among the most affected subpopulations,such as adolescents.展开更多
INTRODUCTION Public stigma on mental health has been defined as‘the set of negative attitudes and beliefs that motivate individuals to fear,reject,avoid and discriminate against people with mental illness’.1 Stigma ...INTRODUCTION Public stigma on mental health has been defined as‘the set of negative attitudes and beliefs that motivate individuals to fear,reject,avoid and discriminate against people with mental illness’.1 Stigma causes immense suffering to people with mental disorders across the globe.According to a recent Human Rights Watch report,people with mental health conditions are still shackled in 60 countries.2 Nearly nine out of 10 mental health service users in England have experi-enced discrimination.3 Stigma can be perpet-uated by people in all walks of life,including the family and friends of those with mental disorders,and healthcare professionals,including those working in mental health.The adverse consequences of stigma include shame,self-blame,isolation and discrimi-nation.展开更多
Various structures such as marine structures age over time. In order to always maintain safety conditions, maintenance processes including inspection and repair should be implemented on them. Corrosion and fatigue cra...Various structures such as marine structures age over time. In order to always maintain safety conditions, maintenance processes including inspection and repair should be implemented on them. Corrosion and fatigue cracks are two main factors that reduce the ultimate strength of the ship's hull girder over time and thus increase the probability and risk of failure. At the time of inspection,the structural conditions must be checked so that, if necessary, the required repairs can be done on it. The main objective of this paper is to provide optimized maintenance plans of the ship structure based on probabilistic concepts with regard to corrosion and fatigue cracks. Maintenance activities increase the operational costs of ships; therefore, it is advisable to inspect and repair in the optimal times. Optimal maintenance planning of the ship structure can be conducted by formulating and solving a multi-objective optimization problem. The use of risk as a structural performance indicator has become more common in recent years. The objective functions of the optimization problem include minimizing the structure's lifecycle maintenance costs, including inspection and repair costs, and also minimizing the maximum risk of structural failure during the ship's life. In the following,to achieve better responses, reliability index has been added to the problem as the third objective function. The multi-objective optimization problem is solved using genetic algorithms. The proposed risk-based approach is applied to the hull structure of a tanker ship.展开更多
“Chemical Research in Chinese Universities”(English Edition),sponsored by Jilin University mandated by the Ministry of Education of P.R.China and published by Higher Education Press in 1984,is a comprehensive academ...“Chemical Research in Chinese Universities”(English Edition),sponsored by Jilin University mandated by the Ministry of Education of P.R.China and published by Higher Education Press in 1984,is a comprehensive academic journal in the field of chemistry.The journal contains original papers,letters,reviews,and highlight written by faculty members,scientific researchers,postgraduates and graduate students of universities and colleges,and scientific institutes all over China and the world,and reports the latest and most creative results of important fundamental research in all aspects of chemistry and of developments with significant consequences across subdisciplines.展开更多
Entangling multiple qubits is one of the central tasks of quantum information processing.We propose an approach to entangle a number of cold ions(individually trapped in a string of microtraps)by a moved cavity.The ca...Entangling multiple qubits is one of the central tasks of quantum information processing.We propose an approach to entangle a number of cold ions(individually trapped in a string of microtraps)by a moved cavity.The cavity is pushed to include the ions one by one with a uniform velocity and thus the information stored in former ions could be transferred to the latter ones by such a moving cavity bus.Since the positions of the trapped ions are precisely located,the strengths and durations of the ion-cavity interactions can be exactly controlled.As a consequence,by properly setting the relevant parameters,typical multi-ion entangled states,e.g.,W state for 10 ions,could be deterministically generated.The feasibility of the proposal is also discussed.展开更多
Considering the growing global demand for energy and the need for countries to achieve climate goals,there is an increasing global interest in small modular reactors(SMRs)and their applications.Accident source term an...Considering the growing global demand for energy and the need for countries to achieve climate goals,there is an increasing global interest in small modular reactors(SMRs)and their applications.Accident source term and radiological consequence evaluations of SMRs are key components of nuclear and radiation safety reviews,which affect the site,exclusion area(EAB),and low population zone outer boundaries.Based on the design characteristics of the SMR and accident analysis results,a theoretical model of a whole-core fuel cladding damage accident was constructed to study the radioactivity released into the environment and its consequences.The accident source term and radiation dose calculation models were established to analyze the released amounts of radionuclides and the total effective dose affecting individuals at the site boundary.The results showed that the amount of radionuclides released into the environment after a whole-core fuel cladding damage accident reached 10^(14) Bq,among which the release amount of ^(133)Xe was the largest.The total effective dose at the site boundary 30 days after the accident was 8.65 mSv.The highest total effective dose affecting individuals occurred to the east-north-east.The results of the accident source term and radiological consequence provide technical support for site boundary dose assessments and reviews of SMRs.展开更多
The temperature dependence of the self-energy of a particle is studied in semi-infinite nuclear matter.Based on the finite temperature Green’s function Mat-subara formalism and applying it to the single particle-stat...The temperature dependence of the self-energy of a particle is studied in semi-infinite nuclear matter.Based on the finite temperature Green’s function Mat-subara formalism and applying it to the single particle-states in ^(208)Pb,the calculated results show that the characteristic enhancement of the effective mass at near the Fermi energy disappears at temperature T=3 MeV,and correspondingly,as a consequence the level-density parameter should decrease in agreement with recent empirical data.展开更多
Scalar particles might be in the universe as diffuse gaseous clouds or compact objects and might be even present in D-stars.The astrophysical consequences are discussed in detail.Especially,D-stars may be considered a...Scalar particles might be in the universe as diffuse gaseous clouds or compact objects and might be even present in D-stars.The astrophysical consequences are discussed in detail.Especially,D-stars may be considered as an elegant candidate.The Einstein ring should be observable with microarcsecond x-ray imaging mission if D-stars exist.展开更多
A simple particle hopping model is proposed to investigate the interaction of two groups of pedestrians,namely straight walking pedestrians and cross-pedestrians.In the model,the straight walking pedestrians have grea...A simple particle hopping model is proposed to investigate the interaction of two groups of pedestrians,namely straight walking pedestrians and cross-pedestrians.In the model,the straight walking pedestrians have greater priority walking on a main road,while other pedestrians arrive at the roadside and check to cross.Herding behavior,by which cross-pedestrians communicate with each other and self-organize to compete for common space with their straight walking counterparts,are newly introduced to reflect realistic crossing behavior in a crowed street.The results demonstrate that herding behavior brings adverse consequences to both types of pedestrians as a whole,although the pedestrians adopting prompt herding behavior can benefit.Furthermore,an increased number of crossing points to avoid the inefficiency of the coupled system is also investigated.展开更多
基金Supported by the National Natural Science Foundation of China(41602129,41602164)China National Science and Technology Major Project(2016ZX05007003,2016ZX05006-005)
文摘The control effects of different occurrence faults on oil and gas accumulation and distribution in the outer slope area of oil and gas reservoirs were studied taking the south-central Wen’an slope of the Jizhong depression in the Bohai Bay Basin as an example.Based on 3D seismic data and the distribution of oil and water,the controlling differences between consequent fault and antithetic fault were analyzed and compared from the formation and evolution rule of faults and the formation mechanism of fault traps,including development positions of the consequent fault traps and antithetic fault traps,oil and gas distribution horizon adjusted by fault and formation period of fault traps.The differences between consequent faults and antithetic faults in controlling reservoirs have three main aspects:(1)Consequent fault traps and antithetic fault traps are in different positions,the consequent fault traps are at the segmented growing point in the hanging wall of"hard-linkage"faults,while the antithetic fault traps are developed in the position with the largest throw in the footwall because of tilting action;(2)The two kinds of faults result in different oil and gas distribution vertically,oil and gas adjusted by consequent faults is distributed in a single layer or multi-layers,while oil and gas adjusted by antithetic faults occur in single layers;(3)The two kinds of fault traps are formed in different periods,the consequent fault traps are formed at the time when the related faults enter the stage of"hard-linkage",while the antithetic fault traps are formed at the beginning of the fault active period.
文摘Silica-coated carbonyl iron particles （CIPs） are fabricated with the Stober method to improve their heat-resistance and wave-aSsorption properties. The morphology, heat-resistance, electromagnetic properties and microwave absorption of raw-CIPs and silica-coated CIPs are investigated using a scanning electron microscope, an energy dispersive spectrometer, a thermal-gravimetric analyzer, and a network analyzer. The results show that the heat-resistance of silica-coated CIPs is better than that of raw CIFs. The reflection losses exceeding -lOdB of silica-coated CIPs are obtained in the frequency range 9.5-12.4 GHz for the absorber thickness of 2.3 mm, and the same reflection losses of uncoated CIPs reach the data in the lower frequency range for the same thickness. The enhanced microwave absorption of silica-coated CIPs can be ascribed to the combination of proper electromagnetic impedance match and the decrease of dielectric permittivity.
文摘The journal Chemical Research in Chinese Universities is a comprehensive academic journal in the field of chemistry,published bimonthly since 1984.The journal publishes research articles,letters/communications and reviews written by faculty members,researchers and postgraduates in universities,colleges and research institutes all over China and overseas.It reports the latest and the most creative results of important fundamental research in all aspects of chemistry and of developments with significant consequences across sub-disciplines.This journal is sponsored by Jilin University and mandated by the Ministry of Education of P.R.China.
文摘The journal Chemical Research in Chinese Universities is a comprehensive academic journal in the field of chemistry,published bimonthly since 1984.The journal publishes research articles,letters/communications and reviews written by faculty members,researchers and postgraduates in universities,colleges and research institutes all over China and overseas.It reports the latest and the most creative results of important fundamental research in all aspects of chemistry and of developments with significant consequences across sub-disciplines.This journal is sponsored by Jilin University and mandated by the Ministry of Education of P.R.China.
基金supported by the scientific research project of Nantong Municipal Health and Wellness Commission:Construction of 4P medical management model of childhood asthma based on the cooperation of medical association(no.MA2021014).
文摘To the editor:Nurses play a vital role in healthcare by providing direct medical care to patients,and their mental well-being significantly impacts the quality of service and patient satisfaction.^(1)Ruminative thinking involves repetitive thoughts about negative feelings,their causes and consequences.This common psychological behaviour innurses can significantly impact their self-evaluation and result in feelings of worthlessness.
文摘The external draft of Harmonized Common Structural Rules(CSR-H) for Bulk Carriers and Oil Tankers has been released for external review. Based on a consistent methodology at the adoption of the current CSR, CSR-H aims to be in compliance with the IMO GBS where GBS functional requirements fall within the scope, and the safety level is equivalent to or higher than the current CSR criteria. In this paper, by consequence assessment on a 320k VLCC, a 163k Suezmax tanker, a 115k Aframax tanker, a 76k Panamax tanker and a 48k MR tanker, the results of the comparison on the structural scantlings to CSR, the evaluation on the increasing of steel weight and some critical technique issues are discussed.
文摘This paper determines a delta inference operator C based on the notion of reasonable consequence of Adams′ system and studies its properties. It shows another approach to study inductive and probabilistic reasoning.
基金supported by China Scholarship Council(201809110035)the State Key Research and Development Plan Project of China(2016YFC0801500).
文摘Oil spill-induced vapor cloud explosions in a confined space can cause catastrophic consequences.In this work,investigation was conducted on the catastrophic pipeline leak,oil spill,and the resulting vapor cloud explosion accident occurring in China in 2013 by modeling analysis,field surveys,and numerical simulations.The total amount of the spilled oil was up to2044.4 m3 due to improper disposal.The long residence time of the oil remaining in a confined space permitted the formation of explosive mixtures and caused the vapor cloud explosion.A numerical model was developed to estimate the consequence of the explosion based on volatilization testing results.The results show that the death-leading zone and the glass-breaking zone could be 18 m and 92 m,respectively,which are consistent with the field investigation.The severity of the explosion is related to the amount of the oil spill,properties of oil,and volatilization time.It is recommended that a comprehensive risk assessment be conducted to analyze the possible consequences upon oil spilling into a confined space.Prompt collection and ventilation measures should be taken immediately after the spill occurs to reduce the time for oil volatilization and prevent the mixture from reaching its explosive limit.
基金Supported by the National Natural Science Foundation of China under Grant Nos 11005103,11005104,10835005the Offices of NP and HEP within the U.S.DOE Office of Science under the contracts of DE-FG02-88ER40412,DE-AC02-98CH10886the DAE-BRNS Project Sanction under Grant No 2010/21/15-BRNS/2026.
文摘Nonextensive statistics in a blast-wave model is implemented to describe the identified hadron production in relativistic p+p and nucleus-nucleus collisions.Incorporating the core and corona components within the TBW formalism allows us to describe simultaneously some of the major observations in hadronic observables at the Relativistic Heavy-Ion Collider(RHIC):the amount of constituent quark scaling(NCQ),the large radial and elliptic flow,the effect of gluon saturation,and the suppression of hadron production at high transverse momentum(p_(T))due to jet quenching.In this formalism,the NCQ scaling at the RHIC appears as a consequence of a non-equilibrium process.Our study also provides concise reference distributions with a leastχ^(2) fit of the available experimental data for future experiments and models.
基金supported by the National Key Research and Development Program of China(Grant No.2017YFA0304203)the Program for Changjiang Scholars and Innovative Research Team(Grant No.IRT17R70)+4 种基金the National Natural Science Foundation of China(Grant Nos.12004193 and 11904215)the 111 Project(Grant No.D18001)the Fund for Shanxi 1331 Project Key Subjects Constructionthe Hundred Talent Program of Shanxi ProvinceNJUPT-SF(Grant No.NY220089)。
文摘Electronic charge of molecules can move on time scales when the nuclei stand practically still,from few hundreds of attoseconds to few femtoseconds.This ultrafast process is called“charge migration”.A typical consequence is rapid change of electronic dipole,which points to the center of charge.Corresponding linear(one-dimensional,1D)and planar(2D)dipolar motions have already been well documented.Here we construct the first case of charge migration which causes chiral 3D dipolar motion,specifically along a helix about oriented iodo-acetylene(HCCI).Quantum dynamics simulations show that this can be induced by well-designed laser pulses.
文摘Dear editor,Traumatic orbital haemorrhage is an unfortunate complication with potential vision-threatening consequences.[1-3]The collection of blood can occur anywhere along the potential free orbital spaces,[4]but the subperiosteal collection of the blood is an important clinical variant where careful and timely intervention can give commendable rewards to the surgeon as well as to the patient.[1,2]Subperiosteal hematoma could be traumatic or non-traumatic,in turns,the non-traumatic cases may be due to bleeding tendency as in cases of leukaemia.
基金The BCC19C was established and maintained through operational support from Data Analytics,Reporting and Evaluation(DARE)BC Centre for Disease Control(BCCDC)at the Provincial Health Services Authority(PHSA).
文摘Background The impact of the COVID-19 pandemic on the population’s mental health is vital for informing public health policy and decision-making.However,information on mental health-related healthcare service utilisation trends beyond the first year of the pandemic is limited.Aims We examined mental health-related healthcare service utilisation patterns and psychotropic drug dispensations in British Columbia,Canada,during the COVID-19 pandemic compared with the prepandemic period.Methods We conducted a retrospective population-based secondary analysis using administrative health data to capture outpatient physician visits,emergency department visits,hospital admissions and psychotropic drug dispensations.We examined time trends of mental health-related healthcare service utilisation and psychotropic drug dispensations between January to December 2019(prepandemic period)and January 2020 to December 2021(pandemic period).In addition,we calculated age-standardised rates and rate ratios to compare mental health-related healthcare service utilisation before and during the first two years of the COVID-19 pandemic,stratified by year,sex,age and condition.Results By late 2020,except for emergency department visits,utilisation of healthcare services recovered to prepandemic levels.Between 2019 and 2021,the monthly average rate for overall mental health-related outpatient physician visits,emergency department visits and psychotropic drug dispensations increased significantly by 24%,5%and 8%,respectively.Notable and statistically significant increases were observed among 10–14 year-olds(44%in outpatient physician visits,30%in emergency department visits,55%in hospital admissions and 35%in psychotropic drug dispensations)and 15–19 year-olds(45%in outpatient physician visits,14%in emergency department visits,18%in hospital admissions and 34%in psychotropic drug dispensations).Additionally,these increases were more prominent among females than males,with some variation for specific mental health-related conditions.Conclusions The increase in mental health-related healthcare service utilisation and psychotropic drug dispensations during the pandemic likely reflects significant societal consequences of both the pandemic and pandemic management measures.Recovery efforts in British Columbia should consider these findings,especially among the most affected subpopulations,such as adolescents.
文摘INTRODUCTION Public stigma on mental health has been defined as‘the set of negative attitudes and beliefs that motivate individuals to fear,reject,avoid and discriminate against people with mental illness’.1 Stigma causes immense suffering to people with mental disorders across the globe.According to a recent Human Rights Watch report,people with mental health conditions are still shackled in 60 countries.2 Nearly nine out of 10 mental health service users in England have experi-enced discrimination.3 Stigma can be perpet-uated by people in all walks of life,including the family and friends of those with mental disorders,and healthcare professionals,including those working in mental health.The adverse consequences of stigma include shame,self-blame,isolation and discrimi-nation.
文摘Various structures such as marine structures age over time. In order to always maintain safety conditions, maintenance processes including inspection and repair should be implemented on them. Corrosion and fatigue cracks are two main factors that reduce the ultimate strength of the ship's hull girder over time and thus increase the probability and risk of failure. At the time of inspection,the structural conditions must be checked so that, if necessary, the required repairs can be done on it. The main objective of this paper is to provide optimized maintenance plans of the ship structure based on probabilistic concepts with regard to corrosion and fatigue cracks. Maintenance activities increase the operational costs of ships; therefore, it is advisable to inspect and repair in the optimal times. Optimal maintenance planning of the ship structure can be conducted by formulating and solving a multi-objective optimization problem. The use of risk as a structural performance indicator has become more common in recent years. The objective functions of the optimization problem include minimizing the structure's lifecycle maintenance costs, including inspection and repair costs, and also minimizing the maximum risk of structural failure during the ship's life. In the following,to achieve better responses, reliability index has been added to the problem as the third objective function. The multi-objective optimization problem is solved using genetic algorithms. The proposed risk-based approach is applied to the hull structure of a tanker ship.
文摘“Chemical Research in Chinese Universities”(English Edition),sponsored by Jilin University mandated by the Ministry of Education of P.R.China and published by Higher Education Press in 1984,is a comprehensive academic journal in the field of chemistry.The journal contains original papers,letters,reviews,and highlight written by faculty members,scientific researchers,postgraduates and graduate students of universities and colleges,and scientific institutes all over China and the world,and reports the latest and most creative results of important fundamental research in all aspects of chemistry and of developments with significant consequences across subdisciplines.
基金by the National Natural Science Foundation of China under Grant Nos 10874142 and 90921010the National Basic Research Program of China under Grant No 2010CB923104.
文摘Entangling multiple qubits is one of the central tasks of quantum information processing.We propose an approach to entangle a number of cold ions(individually trapped in a string of microtraps)by a moved cavity.The cavity is pushed to include the ions one by one with a uniform velocity and thus the information stored in former ions could be transferred to the latter ones by such a moving cavity bus.Since the positions of the trapped ions are precisely located,the strengths and durations of the ion-cavity interactions can be exactly controlled.As a consequence,by properly setting the relevant parameters,typical multi-ion entangled states,e.g.,W state for 10 ions,could be deterministically generated.The feasibility of the proposal is also discussed.
文摘Considering the growing global demand for energy and the need for countries to achieve climate goals,there is an increasing global interest in small modular reactors(SMRs)and their applications.Accident source term and radiological consequence evaluations of SMRs are key components of nuclear and radiation safety reviews,which affect the site,exclusion area(EAB),and low population zone outer boundaries.Based on the design characteristics of the SMR and accident analysis results,a theoretical model of a whole-core fuel cladding damage accident was constructed to study the radioactivity released into the environment and its consequences.The accident source term and radiation dose calculation models were established to analyze the released amounts of radionuclides and the total effective dose affecting individuals at the site boundary.The results showed that the amount of radionuclides released into the environment after a whole-core fuel cladding damage accident reached 10^(14) Bq,among which the release amount of ^(133)Xe was the largest.The total effective dose at the site boundary 30 days after the accident was 8.65 mSv.The highest total effective dose affecting individuals occurred to the east-north-east.The results of the accident source term and radiological consequence provide technical support for site boundary dose assessments and reviews of SMRs.
文摘The temperature dependence of the self-energy of a particle is studied in semi-infinite nuclear matter.Based on the finite temperature Green’s function Mat-subara formalism and applying it to the single particle-states in ^(208)Pb,the calculated results show that the characteristic enhancement of the effective mass at near the Fermi energy disappears at temperature T=3 MeV,and correspondingly,as a consequence the level-density parameter should decrease in agreement with recent empirical data.
基金Supported by the National Natural Science Foundation of China under Grant No.19875016the Doctorial Fund from the Education Ministry of China under Grant No.1999025110.
文摘Scalar particles might be in the universe as diffuse gaseous clouds or compact objects and might be even present in D-stars.The astrophysical consequences are discussed in detail.Especially,D-stars may be considered as an elegant candidate.The Einstein ring should be observable with microarcsecond x-ray imaging mission if D-stars exist.
基金Supported the National Natural Science Foundation of China under Grant Nos 71071044 and 70821061.
文摘A simple particle hopping model is proposed to investigate the interaction of two groups of pedestrians,namely straight walking pedestrians and cross-pedestrians.In the model,the straight walking pedestrians have greater priority walking on a main road,while other pedestrians arrive at the roadside and check to cross.Herding behavior,by which cross-pedestrians communicate with each other and self-organize to compete for common space with their straight walking counterparts,are newly introduced to reflect realistic crossing behavior in a crowed street.The results demonstrate that herding behavior brings adverse consequences to both types of pedestrians as a whole,although the pedestrians adopting prompt herding behavior can benefit.Furthermore,an increased number of crossing points to avoid the inefficiency of the coupled system is also investigated.
