Direct methanol fuel cells(DMFC) are widely considered to be an ideal green energy conversion device but their widespread applications are limited by the high price of the Pt-based catalysts and the instability in ter...Direct methanol fuel cells(DMFC) are widely considered to be an ideal green energy conversion device but their widespread applications are limited by the high price of the Pt-based catalysts and the instability in terms of surface CO toxicity in long-term operation.Herein,the PtFe alloy nanoparticles(NPs) with small particle size(~4.12 nm) supported on carbon black catalysts with different Pt/Fe atomic ratios(Pt_(1)Fe_(2)/C,Pt_(3)Fe_(4)/C,Pt_(1)Fe_(1)/C,and Pt_(2)Fe_(1)/C) are successfully prepared for enhanced anti-CO poisoning during methanol oxidation reaction(MOR).The optimal atomic ratio of Pt/Fe for the MOR is 1:2,and the mass activity of Pt_(1)Fe_(2)/C(5.40 A mg_(Pt)^(-1)) is 13.5 times higher than that of conventional commercial Pt/C(Pt/C-JM)(0.40 A mg_(Pt)^(-1)).The introduction of Fe into the Pt lattice forms the PtFe alloy phase,and the electron density of Pt is reduced after forming the PtFe alloy.In-situ Fourier transform infrared results indicate that the addition of oxyphilic metal Fe has reduced the adsorption of reactant molecules on Pt during the MOR.The doping of Fe atoms helps to desorb toxic intermediates and regenerate Pt active sites,promoting the cleavage of C-O bonds with good selectivity of CO_(2)(58.1%).Moreover,the Pt_(1)Fe_(2)/C catalyst exhibits higher CO tolerance,methanol electrooxidation activity,and long-term stability than other Pt_(x)Fe_(y)/C catalysts.展开更多
An integrated production planning and control model based on MRPⅡand JIT is put forward through analyzing the characteristics of magnetic materials manufacturing companies. Master Production Schedule with limited cap...An integrated production planning and control model based on MRPⅡand JIT is put forward through analyzing the characteristics of magnetic materials manufacturing companies. Master Production Schedule with limited capacity and operational plan in workshop level based on the basic data of flow chart are formulated by this model which applied JIT idea and based on customer order demand. Push production is adapted during execution phase combined with process flow cards. The model is helpful to reduce inventory,keep certain flexbility of production and improve continuity and equilibrium of manufacturing process.展开更多
With the rapid development of postgraduate education in management in China, the traditional teaching quality management mode can not meet the diversity demands to the high-level management talents in nowadays society...With the rapid development of postgraduate education in management in China, the traditional teaching quality management mode can not meet the diversity demands to the high-level management talents in nowadays society. In this paper, the total quality management is introduced into the quality management of postgraduate education in colleges and universities, capacity requirements of management postgraduate is investigated from two perspectives of enterprises and students, the whole operating model is explored as well.展开更多
This paper investigates and analyzes the current situation of young teachers in ten universities in Shaanxi via questionnaire survey and random interview. It is shown that the main source of pressure include the follo...This paper investigates and analyzes the current situation of young teachers in ten universities in Shaanxi via questionnaire survey and random interview. It is shown that the main source of pressure include the following aspects ： heavy burden of education and research, high-pressure in economy and life, high expectations of personal development, lack of physical exercise, mechanization of college evaluation system. On the basis of the above analysis, this paper puts forward the specific EAP model which is suitable to young teachers in NWPU Furtherly, the program impact assessment method is constructed to ensure the effective implementation of the program展开更多
This study analyzes opportunity recognition and development from the perspective of job embeddedness based on entrepreneurial action of tech-entrepreneur. The impact of job embeddedness to entrepreneurial path choice ...This study analyzes opportunity recognition and development from the perspective of job embeddedness based on entrepreneurial action of tech-entrepreneur. The impact of job embeddedness to entrepreneurial path choice of tech-entrepreneur is tested by multi-case study. This paper also provides theoretic evidence to enhance the possibility of success of start-ups for entrepreneurs.展开更多
The application of knowledge management system to manage the internal knowledge of organization has become the effective means, the electronic knowledge reservoirs （EKRs） have become an increasingly popular tool wit...The application of knowledge management system to manage the internal knowledge of organization has become the effective means, the electronic knowledge reservoirs （EKRs） have become an increasingly popular tool within various knowledge management information systems. In this paper, the concept, model, function of the EKRs, and the usage of the EKRs from the perspective of knowledge contribution and knowledge seeking are reviewed. This paper proposes to study EKRs from a more comprehensive view and obtain data from different industries.展开更多
Background:Pregnancy-associated breast cancer(PABC)is a special type of breast cancer that occurs during pregnancy and within 1 year after childbirth.With the rapid social development and the adjustment of reproductiv...Background:Pregnancy-associated breast cancer(PABC)is a special type of breast cancer that occurs during pregnancy and within 1 year after childbirth.With the rapid social development and the adjustment of reproductive policies in China,the average age of females at first childbirth is increasing,which is expected to lead to an increase in the incidence of PABC.This study aimed to accumulate clinical experience and to investigate and summarize the prevalence,diagnosis,and treatment of PABC based on large multicenter samples in China.Methods:According to the Chinese Society of Breast Surgery,a total of 164 patients with PABC in 27 hospitals from January 2016 to December 2018 were identified.The pregnancy status,clinicopathological features,comprehensive treatment methods,and outcomes were retrospectively analyzed.Survival curves were plotted using the Kaplan-Meier method.Results:A total of 164 patients of PABC accounted for 0.30%of the total number of cases in the same period;of which,83 patients were diagnosed during pregnancy and 81 patients during lactation.The median age of PABC was 33 years(24–47 years).Stage Ⅰ patients accounted for 9.1%(15/164),stage Ⅱ 54.9%(90/164),stage Ⅲ 24.4%(40/164),and stage Ⅳ 2.4%(4/164).About 9.1%(15/164)of patients were luminal A.Luminal B patients accounted the most(43.3%[71/164]).About 15.2%(25/164)of patients were human epidermal growth factor receptor 2(Her-2)overexpression and 18.9%(31/164)of patients were triple-negative breast cancer.For pregnancy breast cancer,36.1%(30/83)of patients received direct surgery and 20.5%(17/83)received chemotherapy during pregnancy.About 31.3%(26/83)chose abortion or induction of labor.The median follow-up time was 36 months(3–59 months);11.0%(18/164)patients had local recurrence or distant metastasis and 3.0%(5/164)died.Conclusions:It is safe and feasible to standardize surgery and chemotherapy for PABC.展开更多
基金supported by the National Natural Science Foundation of China(22162012 and 22202089)the Youth Jinggang Scholars Program in Jiangxi Province([2019]57)+6 种基金the Thousand Talents Plan of Jiangxi Province(jxsq2019201083)the Natural Science Foundation of Jiangxi Province for Distinguished Young Scholars(20224ACB213005)the Program of Qingjiang Excellent Young Talents,Jiangxi University of Science and Technology(JXUSTQJBJ2019002)the Research Foundation of Education Bureau of Jiangxi Province of China(GJJ210833)the Foundation of State Key Laboratory of Physical Chemistry of Solid Surfaces(202022)the China Postdoctoral Science Foundation(2021M693893)the Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry(20212BCD42018)。
文摘Direct methanol fuel cells(DMFC) are widely considered to be an ideal green energy conversion device but their widespread applications are limited by the high price of the Pt-based catalysts and the instability in terms of surface CO toxicity in long-term operation.Herein,the PtFe alloy nanoparticles(NPs) with small particle size(~4.12 nm) supported on carbon black catalysts with different Pt/Fe atomic ratios(Pt_(1)Fe_(2)/C,Pt_(3)Fe_(4)/C,Pt_(1)Fe_(1)/C,and Pt_(2)Fe_(1)/C) are successfully prepared for enhanced anti-CO poisoning during methanol oxidation reaction(MOR).The optimal atomic ratio of Pt/Fe for the MOR is 1:2,and the mass activity of Pt_(1)Fe_(2)/C(5.40 A mg_(Pt)^(-1)) is 13.5 times higher than that of conventional commercial Pt/C(Pt/C-JM)(0.40 A mg_(Pt)^(-1)).The introduction of Fe into the Pt lattice forms the PtFe alloy phase,and the electron density of Pt is reduced after forming the PtFe alloy.In-situ Fourier transform infrared results indicate that the addition of oxyphilic metal Fe has reduced the adsorption of reactant molecules on Pt during the MOR.The doping of Fe atoms helps to desorb toxic intermediates and regenerate Pt active sites,promoting the cleavage of C-O bonds with good selectivity of CO_(2)(58.1%).Moreover,the Pt_(1)Fe_(2)/C catalyst exhibits higher CO tolerance,methanol electrooxidation activity,and long-term stability than other Pt_(x)Fe_(y)/C catalysts.
基金supported by Ministry of Education Social Science and Humanities Fund(12YJA630187)SHANNXI Social Science Fund(10Q067)High Education Research Fund of Northwestern Polytechnical University(2014)
文摘An integrated production planning and control model based on MRPⅡand JIT is put forward through analyzing the characteristics of magnetic materials manufacturing companies. Master Production Schedule with limited capacity and operational plan in workshop level based on the basic data of flow chart are formulated by this model which applied JIT idea and based on customer order demand. Push production is adapted during execution phase combined with process flow cards. The model is helpful to reduce inventory,keep certain flexbility of production and improve continuity and equilibrium of manufacturing process.
基金supported by Degree and Postgraduate Education Research Fund of Northwestern Polytechnical University(2016)
文摘With the rapid development of postgraduate education in management in China, the traditional teaching quality management mode can not meet the diversity demands to the high-level management talents in nowadays society. In this paper, the total quality management is introduced into the quality management of postgraduate education in colleges and universities, capacity requirements of management postgraduate is investigated from two perspectives of enterprises and students, the whole operating model is explored as well.
基金fund by High Education Research Fund of Northwestern Polytechnical University(2014)
文摘This paper investigates and analyzes the current situation of young teachers in ten universities in Shaanxi via questionnaire survey and random interview. It is shown that the main source of pressure include the following aspects ： heavy burden of education and research, high-pressure in economy and life, high expectations of personal development, lack of physical exercise, mechanization of college evaluation system. On the basis of the above analysis, this paper puts forward the specific EAP model which is suitable to young teachers in NWPU Furtherly, the program impact assessment method is constructed to ensure the effective implementation of the program
基金supported by SHANNXI Social Science Foundation(10Q067)Ministry of Education Social Science and Humanities Foundation(12YJA630187)High Education Research Fund of Northwestern Polytechnical University(2014)
文摘This study analyzes opportunity recognition and development from the perspective of job embeddedness based on entrepreneurial action of tech-entrepreneur. The impact of job embeddedness to entrepreneurial path choice of tech-entrepreneur is tested by multi-case study. This paper also provides theoretic evidence to enhance the possibility of success of start-ups for entrepreneurs.
基金supported by Ministry of Education Social Science and Humanities Fund(12YJA630187)
文摘The application of knowledge management system to manage the internal knowledge of organization has become the effective means, the electronic knowledge reservoirs （EKRs） have become an increasingly popular tool within various knowledge management information systems. In this paper, the concept, model, function of the EKRs, and the usage of the EKRs from the perspective of knowledge contribution and knowledge seeking are reviewed. This paper proposes to study EKRs from a more comprehensive view and obtain data from different industries.
文摘Background:Pregnancy-associated breast cancer(PABC)is a special type of breast cancer that occurs during pregnancy and within 1 year after childbirth.With the rapid social development and the adjustment of reproductive policies in China,the average age of females at first childbirth is increasing,which is expected to lead to an increase in the incidence of PABC.This study aimed to accumulate clinical experience and to investigate and summarize the prevalence,diagnosis,and treatment of PABC based on large multicenter samples in China.Methods:According to the Chinese Society of Breast Surgery,a total of 164 patients with PABC in 27 hospitals from January 2016 to December 2018 were identified.The pregnancy status,clinicopathological features,comprehensive treatment methods,and outcomes were retrospectively analyzed.Survival curves were plotted using the Kaplan-Meier method.Results:A total of 164 patients of PABC accounted for 0.30%of the total number of cases in the same period;of which,83 patients were diagnosed during pregnancy and 81 patients during lactation.The median age of PABC was 33 years(24–47 years).Stage Ⅰ patients accounted for 9.1%(15/164),stage Ⅱ 54.9%(90/164),stage Ⅲ 24.4%(40/164),and stage Ⅳ 2.4%(4/164).About 9.1%(15/164)of patients were luminal A.Luminal B patients accounted the most(43.3%[71/164]).About 15.2%(25/164)of patients were human epidermal growth factor receptor 2(Her-2)overexpression and 18.9%(31/164)of patients were triple-negative breast cancer.For pregnancy breast cancer,36.1%(30/83)of patients received direct surgery and 20.5%(17/83)received chemotherapy during pregnancy.About 31.3%(26/83)chose abortion or induction of labor.The median follow-up time was 36 months(3–59 months);11.0%(18/164)patients had local recurrence or distant metastasis and 3.0%(5/164)died.Conclusions:It is safe and feasible to standardize surgery and chemotherapy for PABC.
