Subjects: Statistics >> Social Statistics submitted time 2024-05-18 Cooperative journals: 《中国科学院院刊》
Abstract： Adjusting and optimizing the strategic paradigm of China’s agricultural regions in the new era is of great significance to the implementation of the “Greater Food” concept and the building of a strong agriculture. This study takes the layout adjustment of China’s agricultural regions during the Fifteenth Five-Year Plan period as its theme, and firstly summarizes the problems that exist in the main agricultural production regions and the layout changes in grain production bases. Then, in conjunction with the new requirements of the national strategies, the functional types of agricultural regions are refined, the different function positions are clarified, the adjusting idea of the agricultural region’s layout is established, and an optimized scheme is put forward for overall layout of agricultural regions, including eight main agricultural production regions, three sub-production regions, and six agricultural advantage production regions (i.e., “8+3+6”). Finally, this study provides specific suggestions for improving the functions of China’s agricultural regions and proper important construction projects.
Subjects: Library Science，Information Science >> Library Science submitted time 2023-08-26 Cooperative journals: 《图书情报工作》
Abstract： [Purpose/significance] Based on the diffusing channel as moderator variable, the influence mechanism of the diffuser's characteristics and diffusing content of electronic word of mouth (eWOM) on consumer's book purchase intention is studied, which will provide reference for eWOM marketing in book publishing industry.[Method/process]According to information diffusing theory, the theoretical model of eWOM on consumer's book purchase intention is built with the diffusing channel as the moderator variable.The diffusing channel is divided into three types which are cultural promotion, marketing and free discussion platform. The data were collected by questionnaire. The relation between eWOM and consumer's purchase intention was clarified by means of regression analysis, and the influential effect of related factors were empirically tested.[Result/conclusion]The diffusing content (information) has significant direct impact on consumer's book purchase intention. The diffuser's (information source) characteristic has both significant direct impact on purchase intention, and indirect impact with content as the intermediary variable. The diffusing channel (information channel) has significant moderating effect. Between the diffuser's characteristic and purchase intention,cultural promotion platform has the biggest moderating effect. Marketing platform is the second, while free discussion platform is the smallest. Between diffusing content and purchase intention, cultural promotion platform still has the biggest moderating effect.Forum platform is slightly smaller, while marketing platform is the smallest. Finally, suggestions are put forward from three aspects of diffusing content design, celebrity effect exertion and selection and construction of marketing platform.
Subjects: Library Science，Information Science >> Library Science submitted time 2023-01-12
Abstract：
Purpose/significance High pricing and growth or other problems as the unreasonable contracts which libraries faced in the past procurement negotiation with e-resource, the study brings the methods of annual reports of listed companies to we explore new game thoughts. Method/process We structure framework includes industrial chain analysis, revenue-profit indicators, and competitiveness factors , taking Elsevier, CNKI, and Clarivate three companies as cases, then discover that competitiveness, profits and renewal rate are the three most concerned aspects of database providers. We analysis that there are two sides in the game between libraries and database providers at the same time: initiative and passivity, and there were some deviations of recognition in the perception of operating costs and price increases, profits rate and referent, open access and social responsibility in the past train of thought. Result/conclusion We should increase the competitive strategies of zero-sum game and repeated game, and give more funds to domestic academic publishers appropriately, seek media attention, legal support, and deepen research on the price of digital publishing production to face a new round of capital pressure and business remodeling under the open information ecology. Limitation It is necessary to expand other research report or information from professional invest institution to remedying the defects of the annual report in the future.
Peer Review Status:
Awaiting Review
Subjects: Library Science，Information Science >> Library Science submitted time 2023-01-06
Abstract：
Abstract【Purpose/Significance】Digital resource will become the main content of library resource construction, but library is faced with multiple dilemmas such as funding cuts, user demand increasing, and price rise of database providers continuously in the post epidemic period, It is urgent to explore the strategies to deal with these problems.【Method/Process】We condense digital price research findings into eight views include “monopoly theory” “pricing method theory” “game theory”and so on, and review them from the perspective of internal and external causes. According to the classification of the Natural Logic Model of the attribution theory of cognitive psychology, we determine the information conditions of consistency, differentiation and consistency, then conclude that the price fluctuation of digital resources is caused by individual and environmental factors, and individual factors are the main causes. The basis of "monopoly theory""pricing method theory" and "industry theory" are correct exploration of orientation.【Result/Conclusion】We should contemplate the universality of monopoly and analysis its crux , strengthen the function of library alliance in price coordination area, establish the theoretical research system of digital resource pricing, and adapt the new role of supporting open publishing when face to the problem of price fluctuation of digital resources.
Peer Review Status:Awaiting Review
Subjects: Dynamic and Electric Engineering >> Electrical Engineering submitted time 2019-03-05 Cooperative journals: 《电气工程学报》
Abstract：在电网集中监控模式中，变压器负载率监视所采用的传统负载率计算方法 受变压器中、低压侧开关遥测采样正确性的影响。本文利用调度技术支持系统的网络 拓扑分析，引入开关状态参数和主变压器状态参数，提出一种主变压器自适应负载率 算法，并通过仿真模型进行仿真验证，结果表明该方法能正确反映变压器负载率，并 且不受变压器中、低压侧开关遥测采样正确性的影响，对科学调度、精细监控具有重 要意义。
Subjects: Biology >> Zoology submitted time 2018-12-24 Cooperative journals: 《动物营养学报》
Abstract：本试验旨在探讨早期断奶对仔猪机体糖代谢的影响。选择4窝18日龄健康仔猪，从每窝中各选4头共计16头仔猪，称重后其中4头直接屠宰用于取样（血液、肝脏、背最长肌），另外12头进行断奶处理（断奶组）；每窝剩余仔猪由母猪继续哺乳（哺乳组）。在断奶后第1天、第3天和第7天从断奶组和哺乳组各取4头仔猪测定平均日增重、血清中葡萄糖和乳酸含量、肝脏和背最长肌中糖原含量以及肝脏中丙酮酸激酶活性与糖代谢相关基因的相对表达水平。结果表明：与哺乳组仔猪相比，在早期断奶阶段（断奶后1～7 d），断奶组仔猪的平均日增重显著下降（P0.05）、17.81%（P0.05），肝糖原含量分别降低了24.94%（P<0.05）、48.99%（P<0.05）和36.51%（P<0.05），肌糖原含量分别降低了44.49%（P<0.05）、39.68%（P<0.05）和25.52%（P<0.05）；断奶组仔猪肝脏糖酵解关键酶丙酮酸激酶活性及其基因相对表达水平在断奶后第3天和第7天均显著降低（P<0.05），而肝脏糖异生相关酶线粒体磷酸烯醇式丙酮酸羧激酶（断奶后第1天）、胞质磷酸烯醇式丙酮酸羧激酶（断奶后第1天、第3天和第7天）和葡萄糖-6-磷酸酶的基因相对表达水平（断奶后第1天和第3天）均显著提高（P<0.05）。由此可见，早期断奶使得仔猪断奶后前期阶段血清葡萄糖含量、肝糖原和肌糖原含量降低，肝脏的糖异生作用被激活而糖酵解作用被抑制以维持体内的糖代谢平衡。
Subjects: Biology >> Zoology submitted time 2017-10-23 Cooperative journals: 《动物营养学报》
Abstract：本试验旨在比较肥胖型的金华猪和瘦肉型的长白猪肠道古菌结构差异，分析菌群移植小鼠肠道古菌结构。采集金华猪和长白猪的新鲜粪便，通过灌胃移植到经广谱抗生素处理过的小鼠肠道中，提取2种猪粪便及其移植小鼠的盲肠内容物总基因组DNA，使用古菌通用引物对古菌16S rRNA的V4区进行PCR扩增，通过Illumina Hiseq测序平台对扩增产物进行高通量测序，使用QIIME等软件对测序序列进行分析统计。结果表明：金华猪和长白猪粪便及其移植小鼠盲肠内容物中的古菌主要包含3个门，分别为奇古菌门（Thaumarchaeota）、广古菌门（Euryarchaeota）和泉古菌门（Crenarchaeota），其中金华猪粪便中广古菌门的丰度高于长白猪；在属水平上主要包含5个已知属，优势属为餐古菌属（Cenarchaeum）。二者移植小鼠的盲肠内容物古菌结构，在门水平上，移植小鼠的奇古菌门比例占70%以上；奇古菌门的古菌几乎全部来源于餐古菌属；在门和属的水平上，金华猪和长白猪粪便移植小鼠的盲肠古菌结构无显著差异（P>0.05），但基于操作分类单元（OTU）水平的主成分分析显示出很好的组内聚集。由此可见，奇古菌门的餐古菌属是金华猪和长白猪粪便和其移植小鼠盲肠中的优势古菌；金华猪粪便中广古菌门的丰度高于长白猪粪便，且二者移植小鼠盲肠内容物之间古菌结构在OTU水平上存在一定的差异。
Subjects: Biology >> Zoology submitted time 2017-10-10 Cooperative journals: 《动物营养学报》
Abstract：本试验旨在研究仔猪早期断奶过程中血浆氨基酸代谢谱的动态变化。选取8头21日龄“杜×长×大”断奶仔猪，在断奶后0、1、3、5、7、10、15、30 d采集血液样本用于氨基酸分析。结果表明，仔猪血浆精氨酸、瓜氨酸和鸟氨酸含量在断奶后1～5 d内显著下降（P0.05）。主成分分析显示，随着断奶后时间的延长，仔猪血浆氨基酸代谢谱与断奶后0 d的代谢谱差异逐渐变大，然后逐渐向断奶后0 d代谢谱位置靠拢，并趋于稳定，其中断后3～5 d血浆氨基酸代谢谱变化幅度最大。偏最小二乘法判别分析模型表明，谷氨酸在NRC（1998）饲养标准下区分断奶后各时间点血浆代谢谱最重要的氨基酸。由此可见，仔猪在早期断奶阶段机体的蛋白质或者氨基酸代谢发生明显变化，且在断奶后3～5 d变化幅度最为显著。
Subjects: Geosciences >> Space Physics submitted time 2016-05-13
Abstract： Concerning requirements for the on-orbit release and separation of nanosatellite-fractionated payloads,a design of the spring-loaded separation system is presented. It is aimed at the problem that the international commercial-off-the-shelf products are inadaptable for the nonstandard ratio of weight and volume. The separation system is able to support 6 U (1 unit = 1 dm~3 volume) and 10 kg payload. Taking into account the design constraints,the plan consists of the central bearing frame,separation mechanisms and the docking ring. Modal and acceleration loading analyses are carried out. Accordingly the on-orbit simultaneous separation process of two opposite ones is presented. Analyses results show that the structural design meets the requirement for launching. The designed plan serves as an effective and applicable solution for the mission.
Peer Review Status:Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2016-05-13
Abstract： Springs can be used to provide release rate for payload in space missions. In order to guarantee the precise releasing velocity of payload and the minimum mass of springs,a nonlinear constrained optimization model was built with geometric constraints, reliability and stability. The theory solution of MATLAB was brought into Adams for simulation, which can work out the fitting relationship between theory and simulation. The spring design parameters were obtained by using the fitting relationship and calculation of MATLAB. The result was verified by Virtual Prototype Technology and perfect performance of design parameters was achieved.
Peer Review Status:Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2016-05-13
Abstract： This paper discussed in detail the relation between the inflation impact load bearing capability and the structural sensitive parameter. Starting from solving tight-coupling characteristics of inflation impact load,and using the computational modeling and numerical simulation method, the model of coupling analysis between the structure and impact airflow was built. By adjusting structural parameters, the response of the canopy structure was analyzed and compared. The simulation result shows that the weak parts of ring slot parachute include the vicinity of radial reinforcing bands,the connection between the canopy and rope and the neighboring region of the top hole. Strengthening measures and the relation between structural sensitive parameters and load bearing capability were discussed accordingly. Research in the paper proves the validity of the simulation method for structural design. Conclusions provide the solid basis for the optimization design.
Peer Review Status:Awaiting Review
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