According to structure function and lightning damage of a cable car, a feasible method of lightning strike risk evaluation for a cable car was put forward based on the evaluation model and evaluation method in the sta...According to structure function and lightning damage of a cable car, a feasible method of lightning strike risk evaluation for a cable car was put forward based on the evaluation model and evaluation method in the standard IEC62305-2. According to the difference between common buildings and cable cars, problems of height non-uniformity of equivalent section caused by inclination of the cable car and diversity of lightning activity regularity caused by the large area were resolved, and expected annual average frequency of lightning strike was calculated using three dimensional graphic approach and regional lightning characteristic analysis. Based on different types of damage process and loss consequences, according to interception effect against lightning invasion of the lightning protection measures and the method of probability selection proposed in the standard, the probability of casu- alty caused by direct lightning strike in a cable car and a waiting area as well as probabilities of casualty caused by failure of electronic information systems were cal- culated.展开更多
[Objectives]To optimize the preparation technology of Yikangshu granule,an anti-fatigue health food.[Methods]The process was studied from three aspects(raw material extraction,excipient selection and forming process),...[Objectives]To optimize the preparation technology of Yikangshu granule,an anti-fatigue health food.[Methods]The process was studied from three aspects(raw material extraction,excipient selection and forming process),and then it was verified in pilot production,and the content of the three components of the product was determined.[Results]The optimum production process of the formula granules was as follows:raw materials were extracted(adding 1∶9 water,extracting twice,2.5 h each time);vacuum concentration;adding excipients and mixing after vacuum drying,crushing and sieving;granulation of 75%ethanol sifted by a 20-mesh sieve;drying at 60℃,sifting through 14-mesh,and packaging.The average content of products obtained was as follows:crude polysaccharides(3204 mg/100 g),total saponins(2295 mg/100 g),astragaloside A(21 mg/100 g).[Conclusions]The optimized preparation technology is stable and feasible,and has a quality that can be controlled,which can provide a reference for the development of health food in food industry.展开更多
Purpose:The 5th Plenary Session of the 19th Communist Party of China(CPC)Central Committee clearly states that developing science and technology through self-reliance and self-strengthening provides the strategic unde...Purpose:The 5th Plenary Session of the 19th Communist Party of China(CPC)Central Committee clearly states that developing science and technology through self-reliance and self-strengthening provides the strategic underpinning for China’s development.Based on this background,this paper explores a metric model for assessing national scientific research strength through collaboration on research papers.Design/methodology/approach:We propose a novel metric model for assessing national scientific research strength,which sets two indicators,national scientific self-reliance(SR)and national academic contribution(CT),to reflect“self-reliance”and“self-strengthening”respectively.Taking the research papers in quantum technology as an example,this study analyzes the scientific research strength of various countries around the world,especially China in quantum technology.Findings:The results show that the research of quantum technology in China has always been relatively independent with fewer international collaboration papers and located in a more marginal position in cooperation networks.China’s academic contribution(CT)to global quantum technology research is increasing and has been greater than that of the United States in 2020.Combining the two indicators,CT and SR,China’s research strength in the quantum field closely follows the United States,and the United States is the most powerful with high research autonomy.Research limitations:This paper only reflects China’s scientific research strength in quantum technology from collaboration on research papers and doesn’t consider the segmentation of quantum technology and the industrial upstream and downstream aspects,which need further study.Practical implications:The model is helpful to better understand the national scientific research strength in a certain field from“self-reliance”and“self-strengthening”.ScienceOriginality/value:We propose a novel metric model to measure the national scientific research strength from the perspective of“self-reliance”and“self-strengthening”,which provides a solid basis for the assessment of the strength level of scientific research in countries/regions and institutions.展开更多
With the advent of the Internet era, the traditional extensive marketing model has been seriously affected. In contrast, the increasingly prosperous personalized e-commerce market relies on the support of e-commerce p...With the advent of the Internet era, the traditional extensive marketing model has been seriously affected. In contrast, the increasingly prosperous personalized e-commerce market relies on the support of e-commerce platforms to expand rapidly in the market, which is also one of the main features of the era of big data. Therefore, traditional enterprises should actively change old concepts and adopt sophisticated marketing methods to improve consumer experience. This paper studies the application of data mining technology in e-commerce. Understand the use of data mining technology in e-commerce, analyze the problems encountered by data mining technology in e-commerce, and put forward practical countermeasures.展开更多
Mining industry occupies a very important position in China's economic development. It is the basis of many industrial sectors, for industrial production to provide raw materials, so the development of mining indu...Mining industry occupies a very important position in China's economic development. It is the basis of many industrial sectors, for industrial production to provide raw materials, so the development of mining industry will drive the development of urban economy, and metal products are also important war supplies, to defend the national defense has played an important role. However, in the process of coal mine development and mining, there are still technical and technological problems leading to low mining rate. This paper introduces the mining process and technology, analyzes the problems that mining technology is prone to in the mining process, and puts forward corresponding solutions, hoping to be helpful to mining engineering.展开更多
The progress of agricultural production technology has played a significant role in the production of chemical pesticides and agricultural products added with agricultural products, such as pest control. Under such ci...The progress of agricultural production technology has played a significant role in the production of chemical pesticides and agricultural products added with agricultural products, such as pest control. Under such circumstances, the masses are paying more and more attention to their physical and mental health and the improvement of their material living standards, and have put forward high requirements for agricultural products from the related technologies for pesticide residue detection. As for the main characteristics of pesticide residue detection, this paper analyzes and studies the new pretreatment technology and new pesticide detection for pesticide component detection, and the development prospect of new agricultural analysis and detection technology.展开更多
At present, with the rapid development of science and technology, based on the requirements of weapon test and identification tasks, the experimental data acquisition and processing space station, which is suitable fo...At present, with the rapid development of science and technology, based on the requirements of weapon test and identification tasks, the experimental data acquisition and processing space station, which is suitable for a variety of extreme natural environments such as alpine, plateau, mountain, jungle, desert, island and reef, has been studied theoretically and in practice. The space station is a dome-shaped structure with scale-shaped modules and basalt reinforced fiber composite materials, providing thermal insulation, ventilation and continuous power supply. It can provide support and guarantee for the real-time monitoring, recovery and information transmission of test data, and meet the basic work and life needs of test personnel.展开更多
In this research, the materials and the compositions of the surface slurries were chosen by considering the characteristics of Ti investment casting. The effects of solid-liquid ratios on the properties of the slurry ...In this research, the materials and the compositions of the surface slurries were chosen by considering the characteristics of Ti investment casting. The effects of solid-liquid ratios on the properties of the slurry and the effects of baking temperatures on the flexural strength have also been investigated. Flawless shells having smooth inner surface were manufactured with proper technology. Ti and its alloys were melted and poured by water-cooled Cu crucible vacuum induction furnace. The qualities of the investment castings made accordingly were studied and analyzed.展开更多
A dvanced Metallic Materials Research and Processing Technology Center was found in December 1998. As a unit under The College of Mechanical Engineering, the Center is an expansion of the former Cast and Composite Mat...A dvanced Metallic Materials Research and Processing Technology Center was found in December 1998. As a unit under The College of Mechanical Engineering, the Center is an expansion of the former Cast and Composite Materials Research Group, which was found in the early eighties of last century. The Center is focusing in the basic and applied research, and development of advanced metallic materials and their processing technology. It also functions as an organization展开更多
Audio information hiding technology is an important branch of stenography. This article introduces the basic concepts, principles, characteristics and the typical models of the audio information hiding. It then classi...Audio information hiding technology is an important branch of stenography. This article introduces the basic concepts, principles, characteristics and the typical models of the audio information hiding. It then classifies the audio information hiding methods, according to the domain used by them including time, frequency, Discrete Cosine Transform (DCT), Discrete Wavelet Transform (DWT) and the compressed., and discusses several mainstream algorithms in various domains. It finally points out that the audio information hiding technology cannot solve the problem of re-record attacks, but it also brings forward the possible solutions to this problem.展开更多
China National Engineering Research Center for Information Technology in Agriculture （NERCITA） was established in 2001 with the approval of the Ministry of Science and Technology of China. As a national research ins...China National Engineering Research Center for Information Technology in Agriculture （NERCITA） was established in 2001 with the approval of the Ministry of Science and Technology of China. As a national research institution, it mainly engages in research and development of agricultural and rural informatization engineering technology. Based on the requirements of agricultural and rural development of China, the major mission of NERCITA is to make key technology innovation, establish technical platform and develop significant products for agriculture, which focus on five aspects： intelligent information processing technology, remote sensing and geographic information system, precision agriculture, biological environment control engineering and automation technology as well as fast detection techniques of agricultural product security and the monitoring technology of farmland environmental quality. The ultimate goal is to provide a powerful technological support for agricultural modernization and rural development.展开更多
With the continuous development of the society, the electrical automation technology will have a broader application prospects in the future. The application of automation technology in electrical engineering can not ...With the continuous development of the society, the electrical automation technology will have a broader application prospects in the future. The application of automation technology in electrical engineering can not only greatly save manpower and material resources, but also effectively reduce capital investment, improve the overall operation efficiency of the system, make China's industrial development process more simple and controllable, and ultimately promote the rapid and stable development of various industries. Mechanical and electrical engineering automation technology is mainly conducive to the machining process which does not rely excessively on manual operation. The use of electric drive to complete the automatic operation of equipment, through electronic technology to complete the intelligent start and stop, can adjust various parameters in time. In order to ensure the effective utilization of mechanical engineering automation technology, the basic content is the advantages and characteristics.展开更多
Ascientific research center on nanometer technology was set up on October 30, 2000 at the Chinese Academy of Sciences (CAS). The aim of the center, called CAS Center for Nanometer Science and Technology, will strive t...Ascientific research center on nanometer technology was set up on October 30, 2000 at the Chinese Academy of Sciences (CAS). The aim of the center, called CAS Center for Nanometer Science and Technology, will strive to enhance China’s research strength, realize its commercialization and increase its competitiveness in the field, says Prof. Bai Chunli, CAS Vice President.展开更多
In order to systemically summarize and integrate technology of highway construction in permafrost regions on the Qinghai-Tibet Plateau,we studied disciplines and mechanisms of formation and development of problems and...In order to systemically summarize and integrate technology of highway construction in permafrost regions on the Qinghai-Tibet Plateau,we studied disciplines and mechanisms of formation and development of problems and challenges in highway engineer-ing in high-altitude permafrost regions based on construction experiences for 50 years and on 30 years of research regarding the Qinghai-Tibet and Xikang highways.Embankments,pavements,bridges,and countermeasures for ecosystem protection in per-mafrost regions were the main study objects.We combined extensive analysis of key problems of engineering stability with inter-action between permafrost and highways,theoretical models,indoor tests,and field tests to reveal the interaction between em-bankments,pavements,bridge piles,and permafrost.In this paper,we propose a series of engineering measures for highway sta-bility,design parameters,key indexes for pavement durability in low temperature,relationships between re-freezing time of bridge-pile foundation and strength development as well as ecosystem recovery in high-latitude cold regions;these eventually form a construction technology package for permafrost regions.展开更多
In the process of highway construction, cement stabilized macadam base construction technology is a commonly practical technology in actual construction. In this paper, the principle of cement-stabilized macadam techn...In the process of highway construction, cement stabilized macadam base construction technology is a commonly practical technology in actual construction. In this paper, the principle of cement-stabilized macadam technology is analyzed and expatiated by consulting and studying the relevant literature, and on this basis, the advantages of the technology and some key problems in the actual construction are summarized. I hope this article can provide some theoretical reference for the construction work of related units.展开更多
基金Supported by the Scientific Research Project of Hebei Meteorological Bureau in 2014(14ky20)~~
文摘According to structure function and lightning damage of a cable car, a feasible method of lightning strike risk evaluation for a cable car was put forward based on the evaluation model and evaluation method in the standard IEC62305-2. According to the difference between common buildings and cable cars, problems of height non-uniformity of equivalent section caused by inclination of the cable car and diversity of lightning activity regularity caused by the large area were resolved, and expected annual average frequency of lightning strike was calculated using three dimensional graphic approach and regional lightning characteristic analysis. Based on different types of damage process and loss consequences, according to interception effect against lightning invasion of the lightning protection measures and the method of probability selection proposed in the standard, the probability of casu- alty caused by direct lightning strike in a cable car and a waiting area as well as probabilities of casualty caused by failure of electronic information systems were cal- culated.
基金Research Fund of Langfang Normal University-Doctoral Research Startup Project(XBQ202032)Youth Fund Project of Langfang Normal University(LSLQ201703)National Natural Science Foundation of China(81573526).
文摘[Objectives]To optimize the preparation technology of Yikangshu granule,an anti-fatigue health food.[Methods]The process was studied from three aspects(raw material extraction,excipient selection and forming process),and then it was verified in pilot production,and the content of the three components of the product was determined.[Results]The optimum production process of the formula granules was as follows:raw materials were extracted(adding 1∶9 water,extracting twice,2.5 h each time);vacuum concentration;adding excipients and mixing after vacuum drying,crushing and sieving;granulation of 75%ethanol sifted by a 20-mesh sieve;drying at 60℃,sifting through 14-mesh,and packaging.The average content of products obtained was as follows:crude polysaccharides(3204 mg/100 g),total saponins(2295 mg/100 g),astragaloside A(21 mg/100 g).[Conclusions]The optimized preparation technology is stable and feasible,and has a quality that can be controlled,which can provide a reference for the development of health food in food industry.
基金supported by National Key R&D Program of China(Grant No.2019YFA0707201)the open fund of ISTIC-Springer Nature Joint Lab for Open Science(Grant No.HX20211292).
文摘Purpose:The 5th Plenary Session of the 19th Communist Party of China(CPC)Central Committee clearly states that developing science and technology through self-reliance and self-strengthening provides the strategic underpinning for China’s development.Based on this background,this paper explores a metric model for assessing national scientific research strength through collaboration on research papers.Design/methodology/approach:We propose a novel metric model for assessing national scientific research strength,which sets two indicators,national scientific self-reliance(SR)and national academic contribution(CT),to reflect“self-reliance”and“self-strengthening”respectively.Taking the research papers in quantum technology as an example,this study analyzes the scientific research strength of various countries around the world,especially China in quantum technology.Findings:The results show that the research of quantum technology in China has always been relatively independent with fewer international collaboration papers and located in a more marginal position in cooperation networks.China’s academic contribution(CT)to global quantum technology research is increasing and has been greater than that of the United States in 2020.Combining the two indicators,CT and SR,China’s research strength in the quantum field closely follows the United States,and the United States is the most powerful with high research autonomy.Research limitations:This paper only reflects China’s scientific research strength in quantum technology from collaboration on research papers and doesn’t consider the segmentation of quantum technology and the industrial upstream and downstream aspects,which need further study.Practical implications:The model is helpful to better understand the national scientific research strength in a certain field from“self-reliance”and“self-strengthening”.ScienceOriginality/value:We propose a novel metric model to measure the national scientific research strength from the perspective of“self-reliance”and“self-strengthening”,which provides a solid basis for the assessment of the strength level of scientific research in countries/regions and institutions.
文摘With the advent of the Internet era, the traditional extensive marketing model has been seriously affected. In contrast, the increasingly prosperous personalized e-commerce market relies on the support of e-commerce platforms to expand rapidly in the market, which is also one of the main features of the era of big data. Therefore, traditional enterprises should actively change old concepts and adopt sophisticated marketing methods to improve consumer experience. This paper studies the application of data mining technology in e-commerce. Understand the use of data mining technology in e-commerce, analyze the problems encountered by data mining technology in e-commerce, and put forward practical countermeasures.
文摘Mining industry occupies a very important position in China's economic development. It is the basis of many industrial sectors, for industrial production to provide raw materials, so the development of mining industry will drive the development of urban economy, and metal products are also important war supplies, to defend the national defense has played an important role. However, in the process of coal mine development and mining, there are still technical and technological problems leading to low mining rate. This paper introduces the mining process and technology, analyzes the problems that mining technology is prone to in the mining process, and puts forward corresponding solutions, hoping to be helpful to mining engineering.
文摘The progress of agricultural production technology has played a significant role in the production of chemical pesticides and agricultural products added with agricultural products, such as pest control. Under such circumstances, the masses are paying more and more attention to their physical and mental health and the improvement of their material living standards, and have put forward high requirements for agricultural products from the related technologies for pesticide residue detection. As for the main characteristics of pesticide residue detection, this paper analyzes and studies the new pretreatment technology and new pesticide detection for pesticide component detection, and the development prospect of new agricultural analysis and detection technology.
文摘At present, with the rapid development of science and technology, based on the requirements of weapon test and identification tasks, the experimental data acquisition and processing space station, which is suitable for a variety of extreme natural environments such as alpine, plateau, mountain, jungle, desert, island and reef, has been studied theoretically and in practice. The space station is a dome-shaped structure with scale-shaped modules and basalt reinforced fiber composite materials, providing thermal insulation, ventilation and continuous power supply. It can provide support and guarantee for the real-time monitoring, recovery and information transmission of test data, and meet the basic work and life needs of test personnel.
文摘In this research, the materials and the compositions of the surface slurries were chosen by considering the characteristics of Ti investment casting. The effects of solid-liquid ratios on the properties of the slurry and the effects of baking temperatures on the flexural strength have also been investigated. Flawless shells having smooth inner surface were manufactured with proper technology. Ti and its alloys were melted and poured by water-cooled Cu crucible vacuum induction furnace. The qualities of the investment castings made accordingly were studied and analyzed.
文摘A dvanced Metallic Materials Research and Processing Technology Center was found in December 1998. As a unit under The College of Mechanical Engineering, the Center is an expansion of the former Cast and Composite Materials Research Group, which was found in the early eighties of last century. The Center is focusing in the basic and applied research, and development of advanced metallic materials and their processing technology. It also functions as an organization
基金This work was funded by the National BasicResearch Program (973 Program) of China underGrant 2007CB311203, and by the National NaturalScience Foundation of China under Grant90604022.
文摘Audio information hiding technology is an important branch of stenography. This article introduces the basic concepts, principles, characteristics and the typical models of the audio information hiding. It then classifies the audio information hiding methods, according to the domain used by them including time, frequency, Discrete Cosine Transform (DCT), Discrete Wavelet Transform (DWT) and the compressed., and discusses several mainstream algorithms in various domains. It finally points out that the audio information hiding technology cannot solve the problem of re-record attacks, but it also brings forward the possible solutions to this problem.
文摘China National Engineering Research Center for Information Technology in Agriculture （NERCITA） was established in 2001 with the approval of the Ministry of Science and Technology of China. As a national research institution, it mainly engages in research and development of agricultural and rural informatization engineering technology. Based on the requirements of agricultural and rural development of China, the major mission of NERCITA is to make key technology innovation, establish technical platform and develop significant products for agriculture, which focus on five aspects： intelligent information processing technology, remote sensing and geographic information system, precision agriculture, biological environment control engineering and automation technology as well as fast detection techniques of agricultural product security and the monitoring technology of farmland environmental quality. The ultimate goal is to provide a powerful technological support for agricultural modernization and rural development.
文摘With the continuous development of the society, the electrical automation technology will have a broader application prospects in the future. The application of automation technology in electrical engineering can not only greatly save manpower and material resources, but also effectively reduce capital investment, improve the overall operation efficiency of the system, make China's industrial development process more simple and controllable, and ultimately promote the rapid and stable development of various industries. Mechanical and electrical engineering automation technology is mainly conducive to the machining process which does not rely excessively on manual operation. The use of electric drive to complete the automatic operation of equipment, through electronic technology to complete the intelligent start and stop, can adjust various parameters in time. In order to ensure the effective utilization of mechanical engineering automation technology, the basic content is the advantages and characteristics.
文摘Ascientific research center on nanometer technology was set up on October 30, 2000 at the Chinese Academy of Sciences (CAS). The aim of the center, called CAS Center for Nanometer Science and Technology, will strive to enhance China’s research strength, realize its commercialization and increase its competitiveness in the field, says Prof. Bai Chunli, CAS Vice President.
文摘In order to systemically summarize and integrate technology of highway construction in permafrost regions on the Qinghai-Tibet Plateau,we studied disciplines and mechanisms of formation and development of problems and challenges in highway engineer-ing in high-altitude permafrost regions based on construction experiences for 50 years and on 30 years of research regarding the Qinghai-Tibet and Xikang highways.Embankments,pavements,bridges,and countermeasures for ecosystem protection in per-mafrost regions were the main study objects.We combined extensive analysis of key problems of engineering stability with inter-action between permafrost and highways,theoretical models,indoor tests,and field tests to reveal the interaction between em-bankments,pavements,bridge piles,and permafrost.In this paper,we propose a series of engineering measures for highway sta-bility,design parameters,key indexes for pavement durability in low temperature,relationships between re-freezing time of bridge-pile foundation and strength development as well as ecosystem recovery in high-latitude cold regions;these eventually form a construction technology package for permafrost regions.
文摘In the process of highway construction, cement stabilized macadam base construction technology is a commonly practical technology in actual construction. In this paper, the principle of cement-stabilized macadam technology is analyzed and expatiated by consulting and studying the relevant literature, and on this basis, the advantages of the technology and some key problems in the actual construction are summarized. I hope this article can provide some theoretical reference for the construction work of related units.
