In this paper, the function of soil and water conservation of vegetation is studied. Firstly, the mechanism of its action is analyzed, and then the current research status is discussed, so as to determine the future r...In this paper, the function of soil and water conservation of vegetation is studied. Firstly, the mechanism of its action is analyzed, and then the current research status is discussed, so as to determine the future research direction. This has an important promoting effect on solving the current soil erosion phenomenon and ensuring the vegetation coverage.展开更多
With the rapid development of economy and the increase of people＇s living standards, functional foods are being gradually embraced by consumers and have a great growth potential. Rice is the main staple food in China...With the rapid development of economy and the increase of people＇s living standards, functional foods are being gradually embraced by consumers and have a great growth potential. Rice is the main staple food in China. It plays an important role in promoting people＇s health and in improving public nutrition, and therefore there is an ever-increasing consumer demand for rice for its functional quality. This study introduces the concept of functional rice and summarizes the current research progress on this topic and the application of breeding strategies including traditional breeding, induced mutagenesis, molecular marker-assisted selection and transgenic engineering in the research of a new generation of functional rice that posses health benefits, therapeutic values, bioreactor properties, and other unique functions. We then point out the prospect of functional rice from the point of view of social development, germplasm innovation, breeding of functional rice by biological technology and the test of active material related functional rice. We conclude that developing and marketing of functional rice is becoming a subject of great importance for research and is to be the focus of research in future.展开更多
A new fit of the pion parton distribution functions is provided. Only valence quark distributions are used at a low evolution scale and are evolved with the modified Dokshitzer- Gribov-Lipatov-Altarelli-Parisi equatio...A new fit of the pion parton distribution functions is provided. Only valence quark distributions are used at a low evolution scale and are evolved with the modified Dokshitzer- Gribov-Lipatov-Altarelli-Parisi equation which is briefly introduced in this work, and the sea quark and gluon distributions are only generated by the quantum chromodynamics processes. We find that the patton distributions can explain the pion-nucleon experiments data well, and it can also be compared with the data from the leading neutron data of experiments at HERA. The momentum distributions among the partons are discussed and our results are consistent with some models.展开更多
Functional rice has functions of adjusting human physiological functions of and preventing diseases. At present,there are researches both at home and abroad about the relationship between nutritional quality and physi...Functional rice has functions of adjusting human physiological functions of and preventing diseases. At present,there are researches both at home and abroad about the relationship between nutritional quality and physiological active substances of rice and human physiological activities. Through conventional breeding,gene mutation technology,and molecular-assisted selection( MAS) technology,it is feasible to select and breed new rice varieties and plants with certain health care functions.展开更多
Purpose： （1） To test basic assumptions underlying frequency-weighted citation analysis： （a） Uni-citations correspond to citations that are nonessential to the citing papers; （b） The influence of a cited paper ...Purpose： （1） To test basic assumptions underlying frequency-weighted citation analysis： （a） Uni-citations correspond to citations that are nonessential to the citing papers; （b） The influence of a cited paper on the citing paper increases with the frequency with which it is cited in the citing paper. （2） To explore the degree to which citation location may be used to help identify nonessential citations. Design/methodology/approach： Each of the in-text citations in all research articles published in Issue 1 of the Journal of the Association for Information Science and Technology （JASIST） 2016 was manually classified into one of these five categories： Applied, Contrastive, Supportive, Reviewed, and Perfunctory. The distributions of citations at different in-text frequencies and in different locations in the text by these functions were analyzed. Findings： Filtering out nonessential citations before assigning weight is important for frequency-weighted citation analysis. For this purpose, removing citations by location is more effective than re-citation analysis that simply removes uni-citations. Removing all citation occurrences in the Background and Literature Review sections and uni-citations in the Introduction section appears to provide a good balance between filtration and error rates. Research limitations： This case study suffers from the limitation of scalability and generalizability. We took careful measures to reduce the impact of other limitations of the data collection approach used. Relying on the researcher＇s judgment to attribute citation functions, this approach is unobtrusive but speculative, and can suffer from a low degree of confidence, thus creating reliability concerns. Practical implications： Weighted citation analysis promises to improve citation analysis for research evaluation, knowledge network analysis, knowledge representation, and information retrieval. The present study showed the importance of filtering out nonessential citations before assigning weight in a weighted citation analysis, which may be a significant step forward to realizing these promises. Originality/value： Weighted citation analysis has long been proposed as a theoretical solution to the problem of citation analysis that treats all citations equally, and has attracted increasing research interest in recent years. The present study showed, for the first time, the importance of filtering out nonessential citations in weighted citation analysis, pointing research in this area in a new direction.展开更多
A brief introduction of the connotation and characteristics of metal functional materials was presented. The current research and development of several important materials and the difference between home and world ad...A brief introduction of the connotation and characteristics of metal functional materials was presented. The current research and development of several important materials and the difference between home and world advanced level were described. The latest trend of research and development was discussed. The industrialization and market for several new metal functional materials were commented and some opinions also were given.展开更多
Juglans mandshurica is a kind of plant with medicinal value, nutrition and health care function, and has high economic value. Cloning of LFY gene is a kind of research method with biological function. In this study, J...Juglans mandshurica is a kind of plant with medicinal value, nutrition and health care function, and has high economic value. Cloning of LFY gene is a kind of research method with biological function. In this study, Juglans mandshurica was used as raw material to regulate the expression and influence the formation of corresponding DNA fragments through the specific genetic characteristics in cells. The flowering of Juglans mandshurica was cloned and screened by using DNA transfer technology, and the relevant LFY gene related to the flowering of Juglans mandshurica was determined to have an important impact on the growth and development stage of Juglans mandshurica, its key enzyme activities and physiological indicators, to shorten the growth cycle of Juglans mandshurica, and to make Juglans mandshurica blossom and bear fruit early.展开更多
草地生态系统作为全球陆地生态系统的主体类型之一,其固碳潜力较大,在全球碳循环和气候变化方面具有重要的调节作用。本文使用VOSviewer和CiteSpace两种可视化软件对Web of Science(WOS)核心合集和中国知网(CNKI)数据库中1999—2022年...草地生态系统作为全球陆地生态系统的主体类型之一,其固碳潜力较大,在全球碳循环和气候变化方面具有重要的调节作用。本文使用VOSviewer和CiteSpace两种可视化软件对Web of Science(WOS)核心合集和中国知网(CNKI)数据库中1999—2022年发表的4464篇论文进行计量学分析,以期揭示草地生态系统固碳功能领域的研究现状和发展态势。结果表明:草地生态系统固碳功能研究的发文数量总体呈现上升趋势。通过VOSviewer对WOS数据库中发文国家的分析显示,中国和美国是该研究领域的主要力量。利用CiteSpace对WOS和CNKI数据库中发文机构的分析显示,在WOS数据库中发文量位居前三的研究机构分别为中国科学院、美国农业部和中国科学院大学;在CNKI数据库中,西北农林科技大学、中国科学院大学和北京林业大学的研究最为活跃,但各研究团队的交流合作还需进一步加强。目前,该领域在两个数据库中的研究热点主要集中在气候变化、人类活动和土壤微生物群落对草地生态系统固碳功能变化的驱动作用,土壤碳储量的时空分异特征,以及草地生态系统固碳功能价值评估等方面。展开更多
文摘In this paper, the function of soil and water conservation of vegetation is studied. Firstly, the mechanism of its action is analyzed, and then the current research status is discussed, so as to determine the future research direction. This has an important promoting effect on solving the current soil erosion phenomenon and ensuring the vegetation coverage.
文摘With the rapid development of economy and the increase of people＇s living standards, functional foods are being gradually embraced by consumers and have a great growth potential. Rice is the main staple food in China. It plays an important role in promoting people＇s health and in improving public nutrition, and therefore there is an ever-increasing consumer demand for rice for its functional quality. This study introduces the concept of functional rice and summarizes the current research progress on this topic and the application of breeding strategies including traditional breeding, induced mutagenesis, molecular marker-assisted selection and transgenic engineering in the research of a new generation of functional rice that posses health benefits, therapeutic values, bioreactor properties, and other unique functions. We then point out the prospect of functional rice from the point of view of social development, germplasm innovation, breeding of functional rice by biological technology and the test of active material related functional rice. We conclude that developing and marketing of functional rice is becoming a subject of great importance for research and is to be the focus of research in future.
文摘A new fit of the pion parton distribution functions is provided. Only valence quark distributions are used at a low evolution scale and are evolved with the modified Dokshitzer- Gribov-Lipatov-Altarelli-Parisi equation which is briefly introduced in this work, and the sea quark and gluon distributions are only generated by the quantum chromodynamics processes. We find that the patton distributions can explain the pion-nucleon experiments data well, and it can also be compared with the data from the leading neutron data of experiments at HERA. The momentum distributions among the partons are discussed and our results are consistent with some models.
基金Supported by Key Scientific and Technological Planning Project of Anhui Province(201503zc03029)Bozhou University-Enterprise Cooperation Technological Innovation Platform Project(2016xqzx05)
文摘Functional rice has functions of adjusting human physiological functions of and preventing diseases. At present,there are researches both at home and abroad about the relationship between nutritional quality and physiological active substances of rice and human physiological activities. Through conventional breeding,gene mutation technology,and molecular-assisted selection( MAS) technology,it is feasible to select and breed new rice varieties and plants with certain health care functions.
文摘Purpose： （1） To test basic assumptions underlying frequency-weighted citation analysis： （a） Uni-citations correspond to citations that are nonessential to the citing papers; （b） The influence of a cited paper on the citing paper increases with the frequency with which it is cited in the citing paper. （2） To explore the degree to which citation location may be used to help identify nonessential citations. Design/methodology/approach： Each of the in-text citations in all research articles published in Issue 1 of the Journal of the Association for Information Science and Technology （JASIST） 2016 was manually classified into one of these five categories： Applied, Contrastive, Supportive, Reviewed, and Perfunctory. The distributions of citations at different in-text frequencies and in different locations in the text by these functions were analyzed. Findings： Filtering out nonessential citations before assigning weight is important for frequency-weighted citation analysis. For this purpose, removing citations by location is more effective than re-citation analysis that simply removes uni-citations. Removing all citation occurrences in the Background and Literature Review sections and uni-citations in the Introduction section appears to provide a good balance between filtration and error rates. Research limitations： This case study suffers from the limitation of scalability and generalizability. We took careful measures to reduce the impact of other limitations of the data collection approach used. Relying on the researcher＇s judgment to attribute citation functions, this approach is unobtrusive but speculative, and can suffer from a low degree of confidence, thus creating reliability concerns. Practical implications： Weighted citation analysis promises to improve citation analysis for research evaluation, knowledge network analysis, knowledge representation, and information retrieval. The present study showed the importance of filtering out nonessential citations before assigning weight in a weighted citation analysis, which may be a significant step forward to realizing these promises. Originality/value： Weighted citation analysis has long been proposed as a theoretical solution to the problem of citation analysis that treats all citations equally, and has attracted increasing research interest in recent years. The present study showed, for the first time, the importance of filtering out nonessential citations in weighted citation analysis, pointing research in this area in a new direction.
文摘A brief introduction of the connotation and characteristics of metal functional materials was presented. The current research and development of several important materials and the difference between home and world advanced level were described. The latest trend of research and development was discussed. The industrialization and market for several new metal functional materials were commented and some opinions also were given.
文摘Juglans mandshurica is a kind of plant with medicinal value, nutrition and health care function, and has high economic value. Cloning of LFY gene is a kind of research method with biological function. In this study, Juglans mandshurica was used as raw material to regulate the expression and influence the formation of corresponding DNA fragments through the specific genetic characteristics in cells. The flowering of Juglans mandshurica was cloned and screened by using DNA transfer technology, and the relevant LFY gene related to the flowering of Juglans mandshurica was determined to have an important impact on the growth and development stage of Juglans mandshurica, its key enzyme activities and physiological indicators, to shorten the growth cycle of Juglans mandshurica, and to make Juglans mandshurica blossom and bear fruit early.
文摘草地生态系统作为全球陆地生态系统的主体类型之一,其固碳潜力较大,在全球碳循环和气候变化方面具有重要的调节作用。本文使用VOSviewer和CiteSpace两种可视化软件对Web of Science(WOS)核心合集和中国知网(CNKI)数据库中1999—2022年发表的4464篇论文进行计量学分析,以期揭示草地生态系统固碳功能领域的研究现状和发展态势。结果表明:草地生态系统固碳功能研究的发文数量总体呈现上升趋势。通过VOSviewer对WOS数据库中发文国家的分析显示,中国和美国是该研究领域的主要力量。利用CiteSpace对WOS和CNKI数据库中发文机构的分析显示,在WOS数据库中发文量位居前三的研究机构分别为中国科学院、美国农业部和中国科学院大学;在CNKI数据库中,西北农林科技大学、中国科学院大学和北京林业大学的研究最为活跃,但各研究团队的交流合作还需进一步加强。目前,该领域在两个数据库中的研究热点主要集中在气候变化、人类活动和土壤微生物群落对草地生态系统固碳功能变化的驱动作用,土壤碳储量的时空分异特征,以及草地生态系统固碳功能价值评估等方面。
