As an important river in the western part of Jilin Province,the lower reach of the Nenjiang River is an important wetland water source conservation area in Jilin Province.Within the watershed,it governs the Momoge Wet...As an important river in the western part of Jilin Province,the lower reach of the Nenjiang River is an important wetland water source conservation area in Jilin Province.Within the watershed,it governs the Momoge Wetland,the Xianghai Wetland,and the Danjiang Wetland in Jilin Province.The main problem in the lower reaches of the Nenjiang River is the uneven distribution of water resources in time and space,and the intensification of land salinization.Zhenlai County and Da an City in the Nenjiang River Basin have sufficient surface water resources,with surface water as the drinking water source.Baicheng City and Tongyu County have scarce surface water resources,and both use groundwater as their domestic water source.The main polluted section in the basin is the Xianghai Reservoir,and the annual water quality evaluation is Class V.However,the water quality of the Tao er River,the main stream of the Nenjiang River,is significantly better than that of the Xianghai Reservoir.In order to better study the water environmental pollution situation in the Nenjiang River basin,monitoring data from five sections of non seasonal rivers in the basin from 2012 to 2021 were selected for studying water quality.This in-depth exploration of the water pollution status and river water quality change trends in the Nenjiang River basin is of great significance for future rural development,agricultural pattern transformation,and the promotion of water ecological civilization construction.展开更多
The Schwarz primitive triply periodic minimal surface(P-type TPMS)lattice structures are widely used.However,these lattice structures have weak load-bearing capacity compared with other cellular structures.In this pap...The Schwarz primitive triply periodic minimal surface(P-type TPMS)lattice structures are widely used.However,these lattice structures have weak load-bearing capacity compared with other cellular structures.In this paper,an adaptive enhancement design method based on the non-uniform stress distribution in structures with uniform thickness is proposed to design the P-type TPMS lattice structures with higher mechanical properties.Two types of structures are designed by adjusting the adaptive thickness distribution in the TPMS.One keeps the same relative density,and the other keeps the same of non-enhanced region thickness.Compared with the uniform lattice structure,the elastic modulus for the structure with the same relative density increases by more than 17%,and the yield strength increases by more than 10.2%.Three kinds of TPMS lattice structures are fabricated by laser powder bed fusion(L-PBF)with 316L stainless steel to verify the proposed enhanced design.The manufacture-induced geometric deviation between the as-design and as-printed models is measured by micro X-ray computed tomography(μ-CT)scans.The quasi-static compression experimental results of P-type TPMS lattice structures show that the reinforced structures have stronger elastic moduli,ultimate strengths,and energy absorption capabilities than the homogeneous P-TPMS lattice structure.展开更多
论文对HITS算法进行了改进,提出加权HITS算法,将HITS算法的论文Authority值、加权HITS算法的论文Authority值与论文被引次数进行对比,讨论了三种评价方法用于论文评价的区别与优缺点。所得结果表明,加权HITS算法可大大降低HITS算法的TKC...论文对HITS算法进行了改进,提出加权HITS算法,将HITS算法的论文Authority值、加权HITS算法的论文Authority值与论文被引次数进行对比,讨论了三种评价方法用于论文评价的区别与优缺点。所得结果表明,加权HITS算法可大大降低HITS算法的TKC(Tightly-Knit Community Effect)效应,加权HITS算法相比于HITS算法可以更加准确地评估学术论文质量;加权HITS算法因不仅考虑了论文被引次数,还考虑了被引论文质量,相比于论文被引次数指标可以更加全面地评价一篇论文的学术影响力。展开更多
Secret image sharing(SIS)is a significant research topic of image information hiding,which divides the image into multiple shares and dis-tributes them to multiple parties for management and preservation.In order to r...Secret image sharing(SIS)is a significant research topic of image information hiding,which divides the image into multiple shares and dis-tributes them to multiple parties for management and preservation.In order to reconstruct the original image,a subset with predetermined number of shares is needed.And just because it is not necessary to use all of the shares to make a reconstruction,SIS creates a high fault tolerance which breaks the limitations of traditional image protection methods,but at the same time,it causes a reduce of safety.Recently,new technologies,such as deep learning and blockchain,have been applied into SIS to improve its efficiency and security.This paper gives an overall review of SIS,discusses four important approaches for SIS,and makes a comparison analysis among them from the perspectives of pixel expansion,tamper resistance,etc.At the end,this paper indicates the possible research directions of SIS in the future.展开更多
以“凤丹”牡丹鲜花为原料,研究酶处理制备牡丹鲜花汁工艺;采用高效液相色谱与四极杆飞行时间串联质谱(high performance liquid chromatography coupled with quadrupole time-of-flight tandem mass spectrometry,HPLC-Q-TOF-MS-MS)...以“凤丹”牡丹鲜花为原料,研究酶处理制备牡丹鲜花汁工艺;采用高效液相色谱与四极杆飞行时间串联质谱(high performance liquid chromatography coupled with quadrupole time-of-flight tandem mass spectrometry,HPLC-Q-TOF-MS-MS)联用技术分析牡丹鲜花汁中化学物质。结果表明,由果胶酶、纤维素酶和木瓜蛋白酶组成的复合酶制剂(质量比1∶2∶1)能提高牡丹鲜花出汁率,达22.3%。复合酶处理的条件为∶酶添加量0.15%(质量分数),酶解温度50℃,酶解时间90 min。鉴定了牡丹鲜花汁中的20个主要成分,包括3个有机酸、8个酚酸、7个黄酮以及2个单萜糖苷。酚酸和黄酮苷是牡丹鲜花汁中主要活性成分,主要以没食子酸、没食子酰葡萄糖、没食子酰单宁、芹菜素葡萄糖苷、芹菜素新橘皮糖苷和山奈酚二葡萄糖苷等形式存在。研究结果为牡丹鲜花制汁方法以及牡丹鲜花液态功能食品开发提供理论依据。展开更多
This paper proposed an innovative teaching approach based on finite element technique(FET)to improve the understanding of material mechanics.A teaching experiment was conducted using pure bending deformation of a beam...This paper proposed an innovative teaching approach based on finite element technique(FET)to improve the understanding of material mechanics.A teaching experiment was conducted using pure bending deformation of a beam as an example,and the deformation and stress distribution of the beam were analyzed using FET.The results showed that using color stress nephograms and color U nephograms can improve students’learning outcomes in mechanics classroom.The high levels of satisfaction and interest in incorporating new techniques into the classroom suggest that there is a need to explore and develop innovative teaching methods in mechanics and related fields.This approach may inspire educators to develop more effective ways of teaching material mechanics,and our research can contribute to the advancement of mechanics education.展开更多
Skilled talents are the main support for the strategic development of science and technology in China.The quality of talents is an important guarantee for the transformation and upgrading of national industries.By ana...Skilled talents are the main support for the strategic development of science and technology in China.The quality of talents is an important guarantee for the transformation and upgrading of national industries.By analyzing and studying Huang Yanpei’s thought on vocational education,this paper focuses on the cultivation of students’craftsmanship in vocational schools.First,we analyze the results of previous research and then elaborate on the connotations of Huang Yanpei’s education thought and craftsmanship spirit.Lastly,we propose five suggestions for the cultivation of craftsmanship.Our research work carries certain reference value to the study of craftsmanship cultivation in Huang Yanpei’s education thought.展开更多
The quality of the teaching staff is crucial to the development of vocational education.Skilled and knowledgeable teachers can provide students with specialized technical knowledge and practical skills.In addition to ...The quality of the teaching staff is crucial to the development of vocational education.Skilled and knowledgeable teachers can provide students with specialized technical knowledge and practical skills.In addition to teaching,teachers also act as mentors in providing guidance and support in all areas to students.However,the development of young teachers faces many problems,such as unclear career plans and a lack of attention to operational skills.This paper analyzes the research findings of past scholars and uses a questionnaire to analyze the problems faced by young teachers in their career development.Based on this,this paper puts forward some targeted suggestions,which can provide guidelines for the career development of young teachers.展开更多
Vocational education is an important part of the overall education system.The development of higher vocational education is one of the guiding principles of education in China.The development of teachers is an importa...Vocational education is an important part of the overall education system.The development of higher vocational education is one of the guiding principles of education in China.The development of teachers is an important support for the development of vocational education.Teachers who can teach theoretically and guide students in practical work are known as“double-qualified”teachers.Building a highly qualified and professional double-qualified teaching team is the fundamental task in modernizing vocational education.Firstly,this paper discusses the importance of“double-qualified”teachers by describing the relevant policies of the Ministry of Education in China.Secondly,it reviews the research works of early scholars.Thirdly,it analyzes the main problems of teacher training in higher education institutions.Fourthly,it proposes five suggestions for the development of a“double-qualified”teaching team in higher education institutions.A high level and professional teaching team is an important support for the high-quality development of vocational institutions.School leaders must attach great importance to the construction of a“double-qualified”teaching team and increase the support in terms of policies,institutional protection,and financial investment.展开更多
This study investigates the challenges encountered by vocational colleges when preparing for innovative skills competitions and proposes effective countermeasures.It highlights issues concerning students’motivation,l...This study investigates the challenges encountered by vocational colleges when preparing for innovative skills competitions and proposes effective countermeasures.It highlights issues concerning students’motivation,limited financial resources and hardware,teacher capacity limitations,inadequate reward systems,and curriculum misalignment.Through meticulous research and analysis,this paper presents practical recommendations to mitigate these challenges.Suggestions encompass strategies to enhance students’motivation,increase financial support,provide professional development opportunities for teachers,revamp the reward system,and align the curriculum with competition requirements.By implementing these measures,vocational colleges can cultivate active student participation,elevate teaching quality,bridge the gap between education and industry demands,and equip students for success in innovative skills competitions.展开更多
Vocational education and general education are two different types of education that are equally important.The orientation of talent training in vocational education is to nurture skilled talents to serve the society....Vocational education and general education are two different types of education that are equally important.The orientation of talent training in vocational education is to nurture skilled talents to serve the society.The practical ability of students is both the focus of teaching in vocational colleges and the requirement of enterprise posts.The various types of skills competitions provide a“stage”for students to showcase their abilities.First,this paper explores students’problem-solving ability while preparing for these competitions,expounding the importance of vocational education and skills competitions.Second,this paper summarizes the views of different scholars.Third,based on a specific case,this paper describes the improvement in students’ability while preparing for these competitions.Fourth,this paper analyzes the results of the questionnaire survey conducted to investigate the improvement in students’ability.Lastly,this paper puts forward several suggestions that appeal for vocational colleges to pay more attention to skills competitions.展开更多
Engineering mechanics is as a basic course,and the learning effect of this course directly affects the learning of subsequent professional courses.However,the teaching quality of engineering mechanics in vocational co...Engineering mechanics is as a basic course,and the learning effect of this course directly affects the learning of subsequent professional courses.However,the teaching quality of engineering mechanics in vocational colleges has been subpar for a long time.In this study,we explored the teaching situation of engineering mechanics by using questionnaires,pointing out the challenges faced in the teaching of engineering mechanics and putting forward four targeted suggestions,which include stimulating students’interest and increasing the investment in laboratory equipment,to improve the teaching quality.The findings of this study may provide some reference for the teaching reform of engineering mechanics.展开更多
文摘As an important river in the western part of Jilin Province,the lower reach of the Nenjiang River is an important wetland water source conservation area in Jilin Province.Within the watershed,it governs the Momoge Wetland,the Xianghai Wetland,and the Danjiang Wetland in Jilin Province.The main problem in the lower reaches of the Nenjiang River is the uneven distribution of water resources in time and space,and the intensification of land salinization.Zhenlai County and Da an City in the Nenjiang River Basin have sufficient surface water resources,with surface water as the drinking water source.Baicheng City and Tongyu County have scarce surface water resources,and both use groundwater as their domestic water source.The main polluted section in the basin is the Xianghai Reservoir,and the annual water quality evaluation is Class V.However,the water quality of the Tao er River,the main stream of the Nenjiang River,is significantly better than that of the Xianghai Reservoir.In order to better study the water environmental pollution situation in the Nenjiang River basin,monitoring data from five sections of non seasonal rivers in the basin from 2012 to 2021 were selected for studying water quality.This in-depth exploration of the water pollution status and river water quality change trends in the Nenjiang River basin is of great significance for future rural development,agricultural pattern transformation,and the promotion of water ecological civilization construction.
基金supported by the National Natural Science Foundation of China(Nos.12002031,12122202U22B2083)+1 种基金the China Postdoctoral Science Foundation(Nos.BX2021038 and 2021M700428)the National Key Research and Development of China(No.2022YFB4601901)。
文摘The Schwarz primitive triply periodic minimal surface(P-type TPMS)lattice structures are widely used.However,these lattice structures have weak load-bearing capacity compared with other cellular structures.In this paper,an adaptive enhancement design method based on the non-uniform stress distribution in structures with uniform thickness is proposed to design the P-type TPMS lattice structures with higher mechanical properties.Two types of structures are designed by adjusting the adaptive thickness distribution in the TPMS.One keeps the same relative density,and the other keeps the same of non-enhanced region thickness.Compared with the uniform lattice structure,the elastic modulus for the structure with the same relative density increases by more than 17%,and the yield strength increases by more than 10.2%.Three kinds of TPMS lattice structures are fabricated by laser powder bed fusion(L-PBF)with 316L stainless steel to verify the proposed enhanced design.The manufacture-induced geometric deviation between the as-design and as-printed models is measured by micro X-ray computed tomography(μ-CT)scans.The quasi-static compression experimental results of P-type TPMS lattice structures show that the reinforced structures have stronger elastic moduli,ultimate strengths,and energy absorption capabilities than the homogeneous P-TPMS lattice structure.
文摘论文对HITS算法进行了改进,提出加权HITS算法,将HITS算法的论文Authority值、加权HITS算法的论文Authority值与论文被引次数进行对比,讨论了三种评价方法用于论文评价的区别与优缺点。所得结果表明,加权HITS算法可大大降低HITS算法的TKC(Tightly-Knit Community Effect)效应,加权HITS算法相比于HITS算法可以更加准确地评估学术论文质量;加权HITS算法因不仅考虑了论文被引次数,还考虑了被引论文质量,相比于论文被引次数指标可以更加全面地评价一篇论文的学术影响力。
基金supported in part by the National Natural Science Foundation of China under Grant 61972205,Grant U1936218in part by the Guangdong Natural Science Funds for Distinguished Young Scholar+2 种基金in part by CSSC Systems Engineering Research Institute(Grant No.193-A11-107-01-33)in part by Science and Technology Planning Project of Changsha(No.kq2004004)in part by the Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET)fund,China.
文摘Secret image sharing(SIS)is a significant research topic of image information hiding,which divides the image into multiple shares and dis-tributes them to multiple parties for management and preservation.In order to reconstruct the original image,a subset with predetermined number of shares is needed.And just because it is not necessary to use all of the shares to make a reconstruction,SIS creates a high fault tolerance which breaks the limitations of traditional image protection methods,but at the same time,it causes a reduce of safety.Recently,new technologies,such as deep learning and blockchain,have been applied into SIS to improve its efficiency and security.This paper gives an overall review of SIS,discusses four important approaches for SIS,and makes a comparison analysis among them from the perspectives of pixel expansion,tamper resistance,etc.At the end,this paper indicates the possible research directions of SIS in the future.
文摘以“凤丹”牡丹鲜花为原料,研究酶处理制备牡丹鲜花汁工艺;采用高效液相色谱与四极杆飞行时间串联质谱(high performance liquid chromatography coupled with quadrupole time-of-flight tandem mass spectrometry,HPLC-Q-TOF-MS-MS)联用技术分析牡丹鲜花汁中化学物质。结果表明,由果胶酶、纤维素酶和木瓜蛋白酶组成的复合酶制剂(质量比1∶2∶1)能提高牡丹鲜花出汁率,达22.3%。复合酶处理的条件为∶酶添加量0.15%(质量分数),酶解温度50℃,酶解时间90 min。鉴定了牡丹鲜花汁中的20个主要成分,包括3个有机酸、8个酚酸、7个黄酮以及2个单萜糖苷。酚酸和黄酮苷是牡丹鲜花汁中主要活性成分,主要以没食子酸、没食子酰葡萄糖、没食子酰单宁、芹菜素葡萄糖苷、芹菜素新橘皮糖苷和山奈酚二葡萄糖苷等形式存在。研究结果为牡丹鲜花制汁方法以及牡丹鲜花液态功能食品开发提供理论依据。
文摘This paper proposed an innovative teaching approach based on finite element technique(FET)to improve the understanding of material mechanics.A teaching experiment was conducted using pure bending deformation of a beam as an example,and the deformation and stress distribution of the beam were analyzed using FET.The results showed that using color stress nephograms and color U nephograms can improve students’learning outcomes in mechanics classroom.The high levels of satisfaction and interest in incorporating new techniques into the classroom suggest that there is a need to explore and develop innovative teaching methods in mechanics and related fields.This approach may inspire educators to develop more effective ways of teaching material mechanics,and our research can contribute to the advancement of mechanics education.
基金Doctoral Scientific Research Foundation of Shanxi Datong University(2014-B-11)National Natural Science Foundation of China(21174114)+3 种基金National Natural Science Foundation of China(21363021)Program for Changjiang Scholars and Innovative Research Team in University of M inistry of Education of China(IRT1177)Scientific and Technical plan project of Gansu province(1204GKCA006)Scientific and Technical Innovation Project of Northw est Normal University(nw nu-kjcxgc-03-63)~~
基金The Project of China Vocational Education Association(Project Number:ZJS2022YB024)The Project of Innovation and Development Center of Ideological and Political Work(Beijing Polytechnic),Ministry of Education(Project Number:2022X305-SXZC).
文摘Skilled talents are the main support for the strategic development of science and technology in China.The quality of talents is an important guarantee for the transformation and upgrading of national industries.By analyzing and studying Huang Yanpei’s thought on vocational education,this paper focuses on the cultivation of students’craftsmanship in vocational schools.First,we analyze the results of previous research and then elaborate on the connotations of Huang Yanpei’s education thought and craftsmanship spirit.Lastly,we propose five suggestions for the cultivation of craftsmanship.Our research work carries certain reference value to the study of craftsmanship cultivation in Huang Yanpei’s education thought.
文摘The quality of the teaching staff is crucial to the development of vocational education.Skilled and knowledgeable teachers can provide students with specialized technical knowledge and practical skills.In addition to teaching,teachers also act as mentors in providing guidance and support in all areas to students.However,the development of young teachers faces many problems,such as unclear career plans and a lack of attention to operational skills.This paper analyzes the research findings of past scholars and uses a questionnaire to analyze the problems faced by young teachers in their career development.Based on this,this paper puts forward some targeted suggestions,which can provide guidelines for the career development of young teachers.
基金This work was supported by the Project of Beijing Office for Education Sciences Planning(Project Number:AFDB21206).
文摘Vocational education is an important part of the overall education system.The development of higher vocational education is one of the guiding principles of education in China.The development of teachers is an important support for the development of vocational education.Teachers who can teach theoretically and guide students in practical work are known as“double-qualified”teachers.Building a highly qualified and professional double-qualified teaching team is the fundamental task in modernizing vocational education.Firstly,this paper discusses the importance of“double-qualified”teachers by describing the relevant policies of the Ministry of Education in China.Secondly,it reviews the research works of early scholars.Thirdly,it analyzes the main problems of teacher training in higher education institutions.Fourthly,it proposes five suggestions for the development of a“double-qualified”teaching team in higher education institutions.A high level and professional teaching team is an important support for the high-quality development of vocational institutions.School leaders must attach great importance to the construction of a“double-qualified”teaching team and increase the support in terms of policies,institutional protection,and financial investment.
基金The Project of China Vocational Education Association(Project number:ZJS2022YB024)the Project of Innovation and Development Center of Ideological and Political Work(Beijing Polytechnic),Ministry of Education(Project number:2022X305-SXZC).
文摘This study investigates the challenges encountered by vocational colleges when preparing for innovative skills competitions and proposes effective countermeasures.It highlights issues concerning students’motivation,limited financial resources and hardware,teacher capacity limitations,inadequate reward systems,and curriculum misalignment.Through meticulous research and analysis,this paper presents practical recommendations to mitigate these challenges.Suggestions encompass strategies to enhance students’motivation,increase financial support,provide professional development opportunities for teachers,revamp the reward system,and align the curriculum with competition requirements.By implementing these measures,vocational colleges can cultivate active student participation,elevate teaching quality,bridge the gap between education and industry demands,and equip students for success in innovative skills competitions.
基金This work was supported by the Project of China Vocational Education Association(Project Number:ZJS2022YB024)the Project of Innovation and Development Center of Ideological and Political Work(Beijing Polytechnic),Ministry of Education(Project Number:2022X305-SXZC).
文摘Vocational education and general education are two different types of education that are equally important.The orientation of talent training in vocational education is to nurture skilled talents to serve the society.The practical ability of students is both the focus of teaching in vocational colleges and the requirement of enterprise posts.The various types of skills competitions provide a“stage”for students to showcase their abilities.First,this paper explores students’problem-solving ability while preparing for these competitions,expounding the importance of vocational education and skills competitions.Second,this paper summarizes the views of different scholars.Third,based on a specific case,this paper describes the improvement in students’ability while preparing for these competitions.Fourth,this paper analyzes the results of the questionnaire survey conducted to investigate the improvement in students’ability.Lastly,this paper puts forward several suggestions that appeal for vocational colleges to pay more attention to skills competitions.
基金supported by the Project of China Vocational Education Association(Project number:ZJS2022YB024)the Project of Innovation and Development Center of Ideological and Political Work(Beijing Polytechnic),Ministry of Education(Project number:2022X305-SXZC)+1 种基金the Project of Beijing Municipal Social Science Foundation(Project number:22XCC015)the Project of Key Program of Beijing Polytechnic(Project number:2023X018-SXZ).
文摘Engineering mechanics is as a basic course,and the learning effect of this course directly affects the learning of subsequent professional courses.However,the teaching quality of engineering mechanics in vocational colleges has been subpar for a long time.In this study,we explored the teaching situation of engineering mechanics by using questionnaires,pointing out the challenges faced in the teaching of engineering mechanics and putting forward four targeted suggestions,which include stimulating students’interest and increasing the investment in laboratory equipment,to improve the teaching quality.The findings of this study may provide some reference for the teaching reform of engineering mechanics.
