Background:The mental health challenges faced by police officers due to high-stress work environments necessitate effective interventions.Cognitive-behavioral therapy(CBT)has shown promise in addressing mental health ...Background:The mental health challenges faced by police officers due to high-stress work environments necessitate effective interventions.Cognitive-behavioral therapy(CBT)has shown promise in addressing mental health issues,and this study aims to evaluate the efficacy of smartphone-based cognitive-behavioral therapy(SCBT)in improving mental health outcomes among police officers.This intervention could provide a reference for enhancing mental health literacy and resilience in this population.Methods:A randomized controlled trial(RCT)design was employed,involving 291 police officers who were randomly assigned to either the SCBT intervention group(n=145)or the control group(n=146).Participants completed pre-and post-intervention assessments using the Symptom Checklist-90(SCL-90),which measures multiple psychological symptoms including somatization,obsessive-compulsiveness,interpersonal sensitivity,depression,anxiety,hostility,phobic anxiety,paranoid ideation,and psychoticism.Statistical analyses were conducted to examine group differences in symptom severity and effect sizes.Results:Post-intervention results indicated significant reductions in somatization,obsessivecompulsiveness,interpersonal sensitivity,depression,anxiety,hostility,phobic anxiety,paranoid ideation,and psychoticism,with large effect sizes observed in the intervention group.Notably,the intervention group showed significantly greater improvements compared to the control group,particularly in overall psychological distress as measured by the total SCL-90 score.However,significant reductions in interpersonal sensitivity and paranoid ideation were also observed in the control group,suggesting external factors may have influenced these dimensions.Conclusion:SCBT demonstrated efficacy in reducing psychological distress among police officers,offering a flexible and accessible mental health intervention.However,challenges such as high dropout rates and the complex,dynamic nature of mental health warrant further investigation.Future studies should explore targeted interventions for specific behavioral issues and consider SCBT as a supplementary tool alongside traditional psychotherapy.展开更多
Based on the interpersonal function in Halliday’s systemic functional grammar,"Miranda Warnings",the typical English Police Caution,is analyzed from the aspects of Mood system,Modality system and Appraisal ...Based on the interpersonal function in Halliday’s systemic functional grammar,"Miranda Warnings",the typical English Police Caution,is analyzed from the aspects of Mood system,Modality system and Appraisal system,with the aim of exploring its interpersonal meanings.Results show that:first,the declarative mood and interrogative mood used in the police caution protect the legitimate rights of the interrogated;second,the widely use of Low value modal verbs demonstrates a more humane and democratic legislation principle;and third,the absence of Affect resources and the frequent application of Capacity resources narrow the interpersonal distance between policeman and the interrogated,reflecting the transformation in policeman’s interrogation practices.展开更多
Some research results are given in this paper about burnthrough and hydrogen cracking with a flowing chamber and a loop. Many factors including plate thickness, running rate, heat input and so forth have been studied....Some research results are given in this paper about burnthrough and hydrogen cracking with a flowing chamber and a loop. Many factors including plate thickness, running rate, heat input and so forth have been studied. By experiments it can be found that occurrence of hydrogen cracking can be effectively reduced by properly increasing heat input and using the tempering bead technique.展开更多
Hydrogen induced cracking (HIC) is one of the main problems of in-service welding onto active pipeline. Microstructure and hardness of welded joint have a vital effect on hydrogen induced cracking. The microstructur...Hydrogen induced cracking (HIC) is one of the main problems of in-service welding onto active pipeline. Microstructure and hardness of welded joint have a vital effect on hydrogen induced cracking. The microstructure and hardness of welded joint of XTO pipeline steel were studied using simulation in-service welding device. The results show that the main microstructures of in-service welded seam are grain boundary ferrite , intracrystalline acicular ferrite , as well as small amount of widmanztatten structure. The main microstructures of coarse grain heat-affected zone (CGHAZ) are coarse granular bainite, lath ferrite and martensite. Metastable phases such as martensite and lath ferrite are found in CGHAZ because of the too quick cooling velocity a'nd the hardness of the CGHAZ is high.展开更多
The special subject 'research on life prediction technology of important in-service pressure' mainly analyzes the failure mechanism of large-sized important and criticalin-service pressure vessels under the ac...The special subject 'research on life prediction technology of important in-service pressure' mainly analyzes the failure mechanism of large-sized important and criticalin-service pressure vessels under the action of working medium and investigates safety assessmentand life prediction technology with a view to enhance the operation reliability of in-servicepressure vessels in China. Based on a series of accident investigation and test & measuringresearch, the cause of cracking of catalytic regenerator is analyzed and the in-line non-destructiveexamination method and failure prevention measures for the cracking of catalytic regenerator areproposed.展开更多
The chamber device was designed and set up to simulate the in-service welding. The results show : the t8/5 , t8/3 and inner wall peak temperature Tp decrease with the cooling rate increases. The welding energy is car...The chamber device was designed and set up to simulate the in-service welding. The results show : the t8/5 , t8/3 and inner wall peak temperature Tp decrease with the cooling rate increases. The welding energy is carried off by flowing medium, the cooling rate increases, and many unbalanced microstructures such as granular bainite, martensite and M-A generate ; it worsens the properties of HAZ. Under air-cooling, the cooling rate is slow, the austenite grain grows obviously, the lath ferrite crosses the whole austenite, and it causes the hardness value is also big. The change of HAZ width is not obvious with the increase of cooling rate; and burn-through is not susceptible to the cooling rate. The quench microstructures increase and the hydrogen does not outflow from the HAZ easily when increase the cooling rate, so the susceptibility of hydrogen cracking increases.展开更多
In the process of new urbanization,the population of megacities is increasing rapidly,the scale of cities is expanding,and the supply of service facilities has been unable to meet the demand.As an important carrier of...In the process of new urbanization,the population of megacities is increasing rapidly,the scale of cities is expanding,and the supply of service facilities has been unable to meet the demand.As an important carrier of urban governance and urban management,the police station should properly deal with the existing problems in the urban police stations,and improve the quality of life of residents by optimizing urban service facilities,which is of great significance for the implementation of people-oriented new urbanization.Taking Changping District of Beijing as an example,this study pointed out that there were many problems in police stations in Changping District.For example,the area of land is not up to the standard,the service capacity is not up to the demand,and the facilities are not up to the demand.Then,three planning strategies:adjusting the planning standards of facilities,optimizing the spatial layout of facilities,and strengthening the later guarantee of facilities were put forward,so as to improve people’s satisfaction with life,promote the high-quality development of new urbanization,and provide reference for the supplement of service facilities in megacities.展开更多
Petrochemical storage tanks are generally inspected when the tank is offline mostly to assess the extent of underside corrosion on the tank floor. Emptying, cleaning and opening a tank for inspection take many months ...Petrochemical storage tanks are generally inspected when the tank is offline mostly to assess the extent of underside corrosion on the tank floor. Emptying, cleaning and opening a tank for inspection take many months and are very expensive. Inspection costs can be reduced significantly by inserting robots through manholes on the tank roof to pertbrm non-destructive testing (NDT). The challenge is to develop robots that can operate safely in explosive and hazardous environments and measure the thickness of floor plates using ultrasound sensors. This paper reports on the development of a small and inexpensive prototype robot (NDTBOT) which is designed to be intrinsically safe for zone zero operation. The robot "hops" across the floor to make measurements, without any external moving parts. The paper describes the design, experimental testing of the NDTBOT and presents results of steel plate thickness measurements made under water.展开更多
Establishing the food and drug police system is particularly important for effectively striking at illegal and criminal activities related to food and drug. This study firstly revealed actual background of establishme...Establishing the food and drug police system is particularly important for effectively striking at illegal and criminal activities related to food and drug. This study firstly revealed actual background of establishment of the food and drug police system. Taking the high profile gutter oil case in 2013 as an example,it analyzed advantages of the police in food safety supervision. Then,it summarized some pilot projects in China and analyzed characteristics of the Office of Criminal Investigations of FDA. Finally,it came up with problems and recommendations for improving food and drug police system.展开更多
With the coverage by the mobile network and the popularization of mobile phone communication software, the traditional voice communication, short message service and even the interconnection service have gradually bee...With the coverage by the mobile network and the popularization of mobile phone communication software, the traditional voice communication, short message service and even the interconnection service have gradually been replaced by mobile terminal equipment. Confronted with the ever-increasingly serous information explosion, police authorities meet with new challenges in their daily police work. This paper establishes a mobile police application system integrating office work, early warning, publicity and surveillance through careful study of the Peer to Peer and Location Based technology, striving to transform the traditional idea, break the traditional mode, expand the tradition scope so as to better exercise the social supervision function, publicize precaution information and crack down on crime.展开更多
With downward pressure of economy facing, monitoring boom index of employment continue to decline. This paper will research on how to cope with urban employment problem using fiscal and financial polices,through build...With downward pressure of economy facing, monitoring boom index of employment continue to decline. This paper will research on how to cope with urban employment problem using fiscal and financial polices,through building system of boom of urban employment, and identifying risk signal of Chinese urban employment.展开更多
Elbows are the most vulnerable parts in pipeline network systems. The residual stress for in-service welding repair has significant impacts on the mechanical properties of straight pipes and elbows. In this paper,the ...Elbows are the most vulnerable parts in pipeline network systems. The residual stress for in-service welding repair has significant impacts on the mechanical properties of straight pipes and elbows. In this paper,the thermal elastic-plastic finite element method is employed to investigate the mechanical field during the in-service welding. The prediction of residual stress and deformation in the straight pipe and elbow is performed based on the validation of the numerical models. And the effects of the curvature radius and defects on the elbow are investigated. The results show that the residual stress distribution is uneven along various directions after welding. And the mechanical properties of the elbow decrease when the curvature radius is small. Compared to the intact elbow,the residual stress of the elbow with defects concentrates in the defective area. The depth of defect is the main factors affecting the mechanical properties of the elbow. A systematic analysis of the mechanical properties of straight pipes and elbows is proposed to provide guidance to the in-service welding.展开更多
SYSWELD was used to simulate in-service welding process of gas pipeline of X70 pipeline steel. Welding thermal cycle, stress and deformation of in-service welded joint were studied. The results show that peak temperat...SYSWELD was used to simulate in-service welding process of gas pipeline of X70 pipeline steel. Welding thermal cycle, stress and deformation of in-service welded joint were studied. The results show that peak temperature of coarse grain heat-affected zone (CGHAZ) of in-service welding onto gas pipeline is the same with routine welding, but ts/5, ts/3 and ts/1 decrease at certain degree. For the zone near welded seam, axial stress and hoop stress in the inner pipe wall are compressive stress when welding source passes through the cross-section that is studied, but residual axial stress and residual hoop stress after welded are all tensile stress. Transient deformation and residual deformation are all convex deformation compared with the original pipe diameter size. Deformation achieves maximum when welding thermal source passes through the cross-section that is studied and then decreases during the cooling process after welding.展开更多
Objective:To investigate the risk factors and protective measures of COVID-19 among policemen in an eastern state of India.Methods:This case-control study was conducted in Bihar,located in the eastern part of India.In...Objective:To investigate the risk factors and protective measures of COVID-19 among policemen in an eastern state of India.Methods:This case-control study was conducted in Bihar,located in the eastern part of India.In total,6 confirmed COVID-19 cases(the case group)and 11 negative contacts of these cases(the control group)of Bihar Military Police participated in the study.Results:All subjects were male with a median age of 51(range:23-60)years.Among these 6 confirmed cases,5 cases were asymptomatic.One third(33.3%)of the case group and the majority(90.9%)of the control group reported maintenance of physical distance of at least 1 meter with others all the time,which was significantly different(P=0.028).There was no other statistically significant difference between the case group and the control group.Conclusions:Physical distancing is the most effective public health measure to control contagious diseases like COVID-19,especially in the absence of an effective vaccine in police settings.展开更多
The software of SYSWELD was used to build model and simulate thermal cycle of in-service welding onto active gas pipeline. Influence of pipe diameter, wall thickness and heat input on thermal cycle was studied. The re...The software of SYSWELD was used to build model and simulate thermal cycle of in-service welding onto active gas pipeline. Influence of pipe diameter, wall thickness and heat input on thermal cycle was studied. The results show that t8/5 , t8/3 and peak temperature of inner surface decrease when wall thickness increases from 5 mm to 12 mm. But t8/1 will increases with the increase of wall thickness and will decrease after the wall thickness is larger than 7 mm. Pipe diameter has little influence on thermal cycle and that influence can be ignored when pipe diameter is greater than 273 mm. t8/5 , t8/3 , t8/1 and peak temperature of inner surface will increase with the increase of heat input.展开更多
基金supported by the Shaanxi Police Officers’Vocational College Scientific Research Project(grant number YJKY202310).
文摘Background:The mental health challenges faced by police officers due to high-stress work environments necessitate effective interventions.Cognitive-behavioral therapy(CBT)has shown promise in addressing mental health issues,and this study aims to evaluate the efficacy of smartphone-based cognitive-behavioral therapy(SCBT)in improving mental health outcomes among police officers.This intervention could provide a reference for enhancing mental health literacy and resilience in this population.Methods:A randomized controlled trial(RCT)design was employed,involving 291 police officers who were randomly assigned to either the SCBT intervention group(n=145)or the control group(n=146).Participants completed pre-and post-intervention assessments using the Symptom Checklist-90(SCL-90),which measures multiple psychological symptoms including somatization,obsessive-compulsiveness,interpersonal sensitivity,depression,anxiety,hostility,phobic anxiety,paranoid ideation,and psychoticism.Statistical analyses were conducted to examine group differences in symptom severity and effect sizes.Results:Post-intervention results indicated significant reductions in somatization,obsessivecompulsiveness,interpersonal sensitivity,depression,anxiety,hostility,phobic anxiety,paranoid ideation,and psychoticism,with large effect sizes observed in the intervention group.Notably,the intervention group showed significantly greater improvements compared to the control group,particularly in overall psychological distress as measured by the total SCL-90 score.However,significant reductions in interpersonal sensitivity and paranoid ideation were also observed in the control group,suggesting external factors may have influenced these dimensions.Conclusion:SCBT demonstrated efficacy in reducing psychological distress among police officers,offering a flexible and accessible mental health intervention.However,challenges such as high dropout rates and the complex,dynamic nature of mental health warrant further investigation.Future studies should explore targeted interventions for specific behavioral issues and consider SCBT as a supplementary tool alongside traditional psychotherapy.
文摘Based on the interpersonal function in Halliday’s systemic functional grammar,"Miranda Warnings",the typical English Police Caution,is analyzed from the aspects of Mood system,Modality system and Appraisal system,with the aim of exploring its interpersonal meanings.Results show that:first,the declarative mood and interrogative mood used in the police caution protect the legitimate rights of the interrogated;second,the widely use of Low value modal verbs demonstrates a more humane and democratic legislation principle;and third,the absence of Affect resources and the frequent application of Capacity resources narrow the interpersonal distance between policeman and the interrogated,reflecting the transformation in policeman’s interrogation practices.
文摘Some research results are given in this paper about burnthrough and hydrogen cracking with a flowing chamber and a loop. Many factors including plate thickness, running rate, heat input and so forth have been studied. By experiments it can be found that occurrence of hydrogen cracking can be effectively reduced by properly increasing heat input and using the tempering bead technique.
文摘Hydrogen induced cracking (HIC) is one of the main problems of in-service welding onto active pipeline. Microstructure and hardness of welded joint have a vital effect on hydrogen induced cracking. The microstructure and hardness of welded joint of XTO pipeline steel were studied using simulation in-service welding device. The results show that the main microstructures of in-service welded seam are grain boundary ferrite , intracrystalline acicular ferrite , as well as small amount of widmanztatten structure. The main microstructures of coarse grain heat-affected zone (CGHAZ) are coarse granular bainite, lath ferrite and martensite. Metastable phases such as martensite and lath ferrite are found in CGHAZ because of the too quick cooling velocity a'nd the hardness of the CGHAZ is high.
基金important scientech problemtackling subject foundation under the state 9th 5-year plan(no.96-918-02-04).
文摘The special subject 'research on life prediction technology of important in-service pressure' mainly analyzes the failure mechanism of large-sized important and criticalin-service pressure vessels under the action of working medium and investigates safety assessmentand life prediction technology with a view to enhance the operation reliability of in-servicepressure vessels in China. Based on a series of accident investigation and test & measuringresearch, the cause of cracking of catalytic regenerator is analyzed and the in-line non-destructiveexamination method and failure prevention measures for the cracking of catalytic regenerator areproposed.
文摘The chamber device was designed and set up to simulate the in-service welding. The results show : the t8/5 , t8/3 and inner wall peak temperature Tp decrease with the cooling rate increases. The welding energy is carried off by flowing medium, the cooling rate increases, and many unbalanced microstructures such as granular bainite, martensite and M-A generate ; it worsens the properties of HAZ. Under air-cooling, the cooling rate is slow, the austenite grain grows obviously, the lath ferrite crosses the whole austenite, and it causes the hardness value is also big. The change of HAZ width is not obvious with the increase of cooling rate; and burn-through is not susceptible to the cooling rate. The quench microstructures increase and the hydrogen does not outflow from the HAZ easily when increase the cooling rate, so the susceptibility of hydrogen cracking increases.
基金Youth Fund Project of the National Natural Science Foundation of China(51608009)Youth Top Talent Training Project of Support Plan for the Construction of High-level Teachers of Beijing Municipal Colleges and Universities in 2019(CIT&TCD201904010).
文摘In the process of new urbanization,the population of megacities is increasing rapidly,the scale of cities is expanding,and the supply of service facilities has been unable to meet the demand.As an important carrier of urban governance and urban management,the police station should properly deal with the existing problems in the urban police stations,and improve the quality of life of residents by optimizing urban service facilities,which is of great significance for the implementation of people-oriented new urbanization.Taking Changping District of Beijing as an example,this study pointed out that there were many problems in police stations in Changping District.For example,the area of land is not up to the standard,the service capacity is not up to the demand,and the facilities are not up to the demand.Then,three planning strategies:adjusting the planning standards of facilities,optimizing the spatial layout of facilities,and strengthening the later guarantee of facilities were put forward,so as to improve people’s satisfaction with life,promote the high-quality development of new urbanization,and provide reference for the supplement of service facilities in megacities.
文摘Petrochemical storage tanks are generally inspected when the tank is offline mostly to assess the extent of underside corrosion on the tank floor. Emptying, cleaning and opening a tank for inspection take many months and are very expensive. Inspection costs can be reduced significantly by inserting robots through manholes on the tank roof to pertbrm non-destructive testing (NDT). The challenge is to develop robots that can operate safely in explosive and hazardous environments and measure the thickness of floor plates using ultrasound sensors. This paper reports on the development of a small and inexpensive prototype robot (NDTBOT) which is designed to be intrinsically safe for zone zero operation. The robot "hops" across the floor to make measurements, without any external moving parts. The paper describes the design, experimental testing of the NDTBOT and presents results of steel plate thickness measurements made under water.
基金Supported by Project of National Natural Science Foundation(71173225)
文摘Establishing the food and drug police system is particularly important for effectively striking at illegal and criminal activities related to food and drug. This study firstly revealed actual background of establishment of the food and drug police system. Taking the high profile gutter oil case in 2013 as an example,it analyzed advantages of the police in food safety supervision. Then,it summarized some pilot projects in China and analyzed characteristics of the Office of Criminal Investigations of FDA. Finally,it came up with problems and recommendations for improving food and drug police system.
文摘With the coverage by the mobile network and the popularization of mobile phone communication software, the traditional voice communication, short message service and even the interconnection service have gradually been replaced by mobile terminal equipment. Confronted with the ever-increasingly serous information explosion, police authorities meet with new challenges in their daily police work. This paper establishes a mobile police application system integrating office work, early warning, publicity and surveillance through careful study of the Peer to Peer and Location Based technology, striving to transform the traditional idea, break the traditional mode, expand the tradition scope so as to better exercise the social supervision function, publicize precaution information and crack down on crime.
文摘With downward pressure of economy facing, monitoring boom index of employment continue to decline. This paper will research on how to cope with urban employment problem using fiscal and financial polices,through building system of boom of urban employment, and identifying risk signal of Chinese urban employment.
基金supported by the Natural Science Foundation of Shandong Province(No.ZR2018MEE012)China University of Petroleum(East China)Graduate Innovation Project(No.YCX2017052)
文摘Elbows are the most vulnerable parts in pipeline network systems. The residual stress for in-service welding repair has significant impacts on the mechanical properties of straight pipes and elbows. In this paper,the thermal elastic-plastic finite element method is employed to investigate the mechanical field during the in-service welding. The prediction of residual stress and deformation in the straight pipe and elbow is performed based on the validation of the numerical models. And the effects of the curvature radius and defects on the elbow are investigated. The results show that the residual stress distribution is uneven along various directions after welding. And the mechanical properties of the elbow decrease when the curvature radius is small. Compared to the intact elbow,the residual stress of the elbow with defects concentrates in the defective area. The depth of defect is the main factors affecting the mechanical properties of the elbow. A systematic analysis of the mechanical properties of straight pipes and elbows is proposed to provide guidance to the in-service welding.
文摘SYSWELD was used to simulate in-service welding process of gas pipeline of X70 pipeline steel. Welding thermal cycle, stress and deformation of in-service welded joint were studied. The results show that peak temperature of coarse grain heat-affected zone (CGHAZ) of in-service welding onto gas pipeline is the same with routine welding, but ts/5, ts/3 and ts/1 decrease at certain degree. For the zone near welded seam, axial stress and hoop stress in the inner pipe wall are compressive stress when welding source passes through the cross-section that is studied, but residual axial stress and residual hoop stress after welded are all tensile stress. Transient deformation and residual deformation are all convex deformation compared with the original pipe diameter size. Deformation achieves maximum when welding thermal source passes through the cross-section that is studied and then decreases during the cooling process after welding.
文摘Objective:To investigate the risk factors and protective measures of COVID-19 among policemen in an eastern state of India.Methods:This case-control study was conducted in Bihar,located in the eastern part of India.In total,6 confirmed COVID-19 cases(the case group)and 11 negative contacts of these cases(the control group)of Bihar Military Police participated in the study.Results:All subjects were male with a median age of 51(range:23-60)years.Among these 6 confirmed cases,5 cases were asymptomatic.One third(33.3%)of the case group and the majority(90.9%)of the control group reported maintenance of physical distance of at least 1 meter with others all the time,which was significantly different(P=0.028).There was no other statistically significant difference between the case group and the control group.Conclusions:Physical distancing is the most effective public health measure to control contagious diseases like COVID-19,especially in the absence of an effective vaccine in police settings.
基金Sponsored by Scientific Research Fund for Doctors(Y040312)Innovation Fund for Doctors(B2005-3) of China University of Petroleum
文摘The software of SYSWELD was used to build model and simulate thermal cycle of in-service welding onto active gas pipeline. Influence of pipe diameter, wall thickness and heat input on thermal cycle was studied. The results show that t8/5 , t8/3 and peak temperature of inner surface decrease when wall thickness increases from 5 mm to 12 mm. But t8/1 will increases with the increase of wall thickness and will decrease after the wall thickness is larger than 7 mm. Pipe diameter has little influence on thermal cycle and that influence can be ignored when pipe diameter is greater than 273 mm. t8/5 , t8/3 , t8/1 and peak temperature of inner surface will increase with the increase of heat input.