This thesis gives the overview of concept and constitution of the closed supply chain of green agricultural products based on logistics center,and the necessity of regarding logistics center as core enterprise.Meanwhi...This thesis gives the overview of concept and constitution of the closed supply chain of green agricultural products based on logistics center,and the necessity of regarding logistics center as core enterprise.Meanwhile,it analyzes the function of logistics center of agricultural products,namely functions of exchange,collection,distribution,storage and transportation.It also poses the prerequisites of logistics center.The logistics center of agricultural products must have stable profit expectancy,prominent scale,strong appealing power,capacity of bearing market risk and basic thoughts of supply chain management.The functional design of the closed supply chain of green agricultural products has been discussed in 5 aspects,namely logistics center,production base,providers of means of production,retailer and consumer.The operating thoughts of the closed supply chain of green agricultural products based on logistics center are put forward on the basis of the research of operating objective and service target of supply chain as follows:first,based on local principal agricultural products,the logistics center mainly distributes the massed agricultural products;second,it is necessary to choose appropriate strategic cooperative partners to sign contract;third,the operating procedure of supply chain entails bringing in professional managerial talents of supply chain;finally,the relationships of supply chain should be maintained.展开更多
Herpes simplex virus type 1（HSV-1） enters productive infection after infecting epithelial cells, where it controls the host nucleus to make viral proteins, starts viral DNA synthesis and assembles infectious virions...Herpes simplex virus type 1（HSV-1） enters productive infection after infecting epithelial cells, where it controls the host nucleus to make viral proteins, starts viral DNA synthesis and assembles infectious virions. In this process, replicating viral genomes are organized into replication centers to facilitate viral growth. HSV-1 is known to use host factors, including host chromatin and host transcription regulators, to transcribe its genes; however, the invading virus also encounters host defense and stress responses to inhibit viral growth. Recently, we found that HSV-1 replication centers recruit host factor CTCF but exclude γH2A.X. Thus, HSV-1 replication centers may selectively recruit cellular factors needed for viral growth, while excluding host factors that are deleterious for viral transcription or replication. Here we report that the viral replication centers selectively excluded modified histone H3, including heterochromatin mark H3K9me3, H3S10 P and active chromatin mark H3K4me3, but not unmodified H3. We found a dynamic association between the viral replication centers and host RNA polymerase II. The centers also recruited components of the DNA damage response pathway, including 53BP1, BRCA1 and host antiviral protein SP100. Importantly, we found that ATM kinase was needed for the recruitment of CTCF to the viral centers. These results suggest that the HSV-1 replication centers took advantage of host signaling pathways to actively recruit or exclude host factors to benefit viral growth.展开更多
With the popularity of Computer Assisted Language Learning(CALL),autonomous language learning centers have been established in the universities throughout the country.However,there are many problems exist in the pract...With the popularity of Computer Assisted Language Learning(CALL),autonomous language learning centers have been established in the universities throughout the country.However,there are many problems exist in the practice of the autonomous language learning center.This essay tries to discuss the problems and its countermeasures with an aim of improving College English learning and teaching by the example of autonomous language learning center in Nanyang Institute of Technology.展开更多
The"Grain-for-Green"project on the Loess Plateau is the largest revegetation program in the world.However,revegetation-induced land use changes can influence both water and carbon cycles,and the diverse cons...The"Grain-for-Green"project on the Loess Plateau is the largest revegetation program in the world.However,revegetation-induced land use changes can influence both water and carbon cycles,and the diverse consequences were not well understood.Therefore,the reasonability and sustainability of revegetation measures are in question.This study quantifies the impacts of revegetation-induced land use conversions on the water and carbon cycles in a typical watershed on the Loess Plateau and identifies suitable areas where revegetation of forest or grassland could benefit both soil and water conservation and carbon sequestration.We used a coupled hydro-biogeochemical model to simulate the changes of a few key components in terms of water and carbon by designing a variety of hypothetical land use conversion scenarios derived from revegetation policy.Compared to the baseline condition(land use in 2000),both sediment yield and water yield decreased substantially when replacing steep cropland with forest or grassland.Converting cropland with slopes larger than 25°,15°,and 6°to forest(CTF)would enhance the carbon sequestration with a negligible negative effect on soil water content,while replacing cropland with grassland(CTG)would result in a decline in net primary production but with a substantial increase in soil water content(3.8%-14.9%).Compared to the baseline,the soil organic carbon would increase by 0.9%-3.2% in CTF and keep relatively stable in CTG.Through testing a variety of hypothetical revegetation scenarios,we identified potential priority areas for CTF and CTG,where revegetation may be appropriate and potentially beneficial to conserving soil and water and enhancing carbon sequestration.Our study highlights the challenges in future water and carbon coupling management under revegetation policy,and our quantitative results and identification of potential areas for revegetation could provide information to policy makers for seeking optimal management on the Loess Plateau.展开更多
一般来讲,if 是最普通的连接词,表示单纯的条件或假设。但是在某些特殊情况下,if 却有其特殊用法,请看下面的例句如何理解。The necklace costs ＄250 if it costs a cent.将 if 从句看作是单纯的条件句,显然是不合逻辑的,这种情况下,if...一般来讲,if 是最普通的连接词,表示单纯的条件或假设。但是在某些特殊情况下,if 却有其特殊用法,请看下面的例句如何理解。The necklace costs ＄250 if it costs a cent.将 if 从句看作是单纯的条件句,显然是不合逻辑的,这种情况下,if 从句失去了其字面意义,有“敢肯定(敢断言)……至少……”之意,那么应翻译为“(我敢说)这条项链至少值250美元”。由此可见,if 从句并不单纯表示条件,而是在条件中寓有肯定主句主论的含义,即 if 从句的作用是:用能够类比的最小单位(如 a cent,a day,a pen-ny,an inch,an ounce,a man,once 等)来对比,强调主句中所要肯定的数字,展开更多
随着计算机信息技术的发展,云计算与大数据技术的出现成为信息产业的重大变革。云计算、物联网、移动互联网的迅速发展催生大数据时代的到来,Hadoop分布式集群的成功搭建为大数据工程研究提供了基础环境。结合虚拟机,通过基于Cent OS 7...随着计算机信息技术的发展,云计算与大数据技术的出现成为信息产业的重大变革。云计算、物联网、移动互联网的迅速发展催生大数据时代的到来,Hadoop分布式集群的成功搭建为大数据工程研究提供了基础环境。结合虚拟机,通过基于Cent OS 7的系统安装、网络配置、远程链接、集群搭建、免密登录、时间同步等过程的研究和实现,让Hadoop集群的配置更加方便、快捷。展开更多
Recent Price Movement Movemeat in becumak pices was mixed over the past month.The July NY/CE furest fell from 142 cents/lb in May and touched levels as low as 136 ces/by the sanot une Moue recenty,Juy pices rebounded ...Recent Price Movement Movemeat in becumak pices was mixed over the past month.The July NY/CE furest fell from 142 cents/lb in May and touched levels as low as 136 ces/by the sanot une Moue recenty,Juy pices rebounded to eves over 145 cents/lb.展开更多
The rapid growth of foreign investment in China will continue and may even accelerate after the country enters the World Trade Organization (WTO), analysts said. "More fields are opening to foreign investors and ...The rapid growth of foreign investment in China will continue and may even accelerate after the country enters the World Trade Organization (WTO), analysts said. "More fields are opening to foreign investors and market regulations are becoming more transparent, which encourages foreign companies to increase their presence in China," said Sun Xiaohua, a senior researcher at the Chinese Academy of International Trade and展开更多
Recently, the National Audit Office ofChina (NAO) announced its survey resultsshowed that the Chinese government hascosted RMB91 billion for the preventionand control of water pollution of three riversand three lakes,...Recently, the National Audit Office ofChina (NAO) announced its survey resultsshowed that the Chinese government hascosted RMB91 billion for the preventionand control of water pollution of three riversand three lakes, which including LiaoRiver, Hai River, Huai River and Taihu Lake,Chaohu Lake, Dianchi Lake, from 2001 to2007. The government has constructed 8201 projects in terms of environmental-pro-展开更多
文摘This thesis gives the overview of concept and constitution of the closed supply chain of green agricultural products based on logistics center,and the necessity of regarding logistics center as core enterprise.Meanwhile,it analyzes the function of logistics center of agricultural products,namely functions of exchange,collection,distribution,storage and transportation.It also poses the prerequisites of logistics center.The logistics center of agricultural products must have stable profit expectancy,prominent scale,strong appealing power,capacity of bearing market risk and basic thoughts of supply chain management.The functional design of the closed supply chain of green agricultural products has been discussed in 5 aspects,namely logistics center,production base,providers of means of production,retailer and consumer.The operating thoughts of the closed supply chain of green agricultural products based on logistics center are put forward on the basis of the research of operating objective and service target of supply chain as follows:first,based on local principal agricultural products,the logistics center mainly distributes the massed agricultural products;second,it is necessary to choose appropriate strategic cooperative partners to sign contract;third,the operating procedure of supply chain entails bringing in professional managerial talents of supply chain;finally,the relationships of supply chain should be maintained.
基金supported by grants from the Yunnan Provincial Government(2013FA0512011HA005)+1 种基金the National Science Foundation of China(NSFC 81471966 to JZ and NSFC 31200964 to YX)the common project of the Panzhihua Science and Technology Bureau from China(2012CY-S-22(9)to HH)
文摘Herpes simplex virus type 1（HSV-1） enters productive infection after infecting epithelial cells, where it controls the host nucleus to make viral proteins, starts viral DNA synthesis and assembles infectious virions. In this process, replicating viral genomes are organized into replication centers to facilitate viral growth. HSV-1 is known to use host factors, including host chromatin and host transcription regulators, to transcribe its genes; however, the invading virus also encounters host defense and stress responses to inhibit viral growth. Recently, we found that HSV-1 replication centers recruit host factor CTCF but exclude γH2A.X. Thus, HSV-1 replication centers may selectively recruit cellular factors needed for viral growth, while excluding host factors that are deleterious for viral transcription or replication. Here we report that the viral replication centers selectively excluded modified histone H3, including heterochromatin mark H3K9me3, H3S10 P and active chromatin mark H3K4me3, but not unmodified H3. We found a dynamic association between the viral replication centers and host RNA polymerase II. The centers also recruited components of the DNA damage response pathway, including 53BP1, BRCA1 and host antiviral protein SP100. Importantly, we found that ATM kinase was needed for the recruitment of CTCF to the viral centers. These results suggest that the HSV-1 replication centers took advantage of host signaling pathways to actively recruit or exclude host factors to benefit viral growth.
文摘With the popularity of Computer Assisted Language Learning(CALL),autonomous language learning centers have been established in the universities throughout the country.However,there are many problems exist in the practice of the autonomous language learning center.This essay tries to discuss the problems and its countermeasures with an aim of improving College English learning and teaching by the example of autonomous language learning center in Nanyang Institute of Technology.
基金funded by the National Natural Science Foundation of China(31961143011)the China Postdoctoral Science Foundation(2020M683451)+2 种基金the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB40020205)the Shaanxi Key Research and Development Program of China(2018ZDXM-GY030)the National Thousand Youth Talent Program of China。
文摘The"Grain-for-Green"project on the Loess Plateau is the largest revegetation program in the world.However,revegetation-induced land use changes can influence both water and carbon cycles,and the diverse consequences were not well understood.Therefore,the reasonability and sustainability of revegetation measures are in question.This study quantifies the impacts of revegetation-induced land use conversions on the water and carbon cycles in a typical watershed on the Loess Plateau and identifies suitable areas where revegetation of forest or grassland could benefit both soil and water conservation and carbon sequestration.We used a coupled hydro-biogeochemical model to simulate the changes of a few key components in terms of water and carbon by designing a variety of hypothetical land use conversion scenarios derived from revegetation policy.Compared to the baseline condition(land use in 2000),both sediment yield and water yield decreased substantially when replacing steep cropland with forest or grassland.Converting cropland with slopes larger than 25°,15°,and 6°to forest(CTF)would enhance the carbon sequestration with a negligible negative effect on soil water content,while replacing cropland with grassland(CTG)would result in a decline in net primary production but with a substantial increase in soil water content(3.8%-14.9%).Compared to the baseline,the soil organic carbon would increase by 0.9%-3.2% in CTF and keep relatively stable in CTG.Through testing a variety of hypothetical revegetation scenarios,we identified potential priority areas for CTF and CTG,where revegetation may be appropriate and potentially beneficial to conserving soil and water and enhancing carbon sequestration.Our study highlights the challenges in future water and carbon coupling management under revegetation policy,and our quantitative results and identification of potential areas for revegetation could provide information to policy makers for seeking optimal management on the Loess Plateau.
文摘一般来讲,if 是最普通的连接词,表示单纯的条件或假设。但是在某些特殊情况下,if 却有其特殊用法,请看下面的例句如何理解。The necklace costs ＄250 if it costs a cent.将 if 从句看作是单纯的条件句,显然是不合逻辑的,这种情况下,if 从句失去了其字面意义,有“敢肯定(敢断言)……至少……”之意,那么应翻译为“(我敢说)这条项链至少值250美元”。由此可见,if 从句并不单纯表示条件,而是在条件中寓有肯定主句主论的含义,即 if 从句的作用是:用能够类比的最小单位(如 a cent,a day,a pen-ny,an inch,an ounce,a man,once 等)来对比,强调主句中所要肯定的数字,
文摘随着计算机信息技术的发展,云计算与大数据技术的出现成为信息产业的重大变革。云计算、物联网、移动互联网的迅速发展催生大数据时代的到来,Hadoop分布式集群的成功搭建为大数据工程研究提供了基础环境。结合虚拟机,通过基于Cent OS 7的系统安装、网络配置、远程链接、集群搭建、免密登录、时间同步等过程的研究和实现,让Hadoop集群的配置更加方便、快捷。
文摘Recent Price Movement Movemeat in becumak pices was mixed over the past month.The July NY/CE furest fell from 142 cents/lb in May and touched levels as low as 136 ces/by the sanot une Moue recenty,Juy pices rebounded to eves over 145 cents/lb.
文摘The rapid growth of foreign investment in China will continue and may even accelerate after the country enters the World Trade Organization (WTO), analysts said. "More fields are opening to foreign investors and market regulations are becoming more transparent, which encourages foreign companies to increase their presence in China," said Sun Xiaohua, a senior researcher at the Chinese Academy of International Trade and
文摘Recently, the National Audit Office ofChina (NAO) announced its survey resultsshowed that the Chinese government hascosted RMB91 billion for the preventionand control of water pollution of three riversand three lakes, which including LiaoRiver, Hai River, Huai River and Taihu Lake,Chaohu Lake, Dianchi Lake, from 2001 to2007. The government has constructed 8201 projects in terms of environmental-pro-
