气象科研机构情报室个性化服务探索

本文主要分析了气象科研机构情报室用户群的特点及需求,探讨了在网络信息技术条件下,为这些用户提供个性化服务的对策。     

基于层次结构的网页自动分类系统的设计与实现

构建了基于层次结构的网页自动分类系统;探讨了该系统中涉及的各项关键技术和构建方法;实现了平面分类和层次分类两种分类方法,并对两种分类方法在网络基础教育资源的环境下进行测试,给出了评价与分析.实验表明,层次分类方法有利于提高分类效率和分类效果.     

沼液对无土栽培小白菜(Brassica chinensis L.)产量及品质的影响初探

无土栽培条件下,初步研究了沼液和化学肥料组合施用对小白菜(Brassica chinensis L.)产量及品质的影响。结果表明,当所施用的沼液营养液肥配方为每升沼液营养液肥中含沼液250 mL,配入3.0g尿素、2.7 g磷酸二氢钾、1.1 g氯化钙、2.5 g硫酸镁和2 mL微量元素储备液(处理3),小白菜产量最高,为10.6克/株,而且,与单纯施用化学肥料营养液(对照)相比,小白菜品质指标硝氮、Vc、可溶性糖及叶绿素含量并没有下降。生产中,合理利用沼液栽培小白菜,对提高其产量和品质有积极的作用。     

基于卡诺模型的高校图书馆信息服务质量评价研究

阐述高校图书馆读者满意度评价的意义,运用卡诺模型对高校图书馆信息服务读者满意度和重要度进行了定性分析,对如何提高读者满意度提出建议.     

中国汽车再制造产业发展模式分析

再制造是汽车工业发展循环经济、走可持续发展道路的一个重要技术途径.目前我国汽车零部件再制造试点工作已经展开,产业发展模式的选择是一个值得探讨的问题.本文系统分析了制约我国再制造产业发展的政策性、技术性以及意识性等因素,论证了不同投入主体的投入动机、投入目标以及投入效果,根据产业发展的不同阶段所需资源投入侧重点的不同,提出了政府激励模式、技术推动模式和市场引导模式三种产业发展模式,以期对中国汽车再制造产业的发展有所启示.     

家庭农场对绿色生产的影响——以江苏省三市水稻种植户为例

关注家庭农场这一新型经营主体的绿色生产行为,以江苏省三市共468户水稻种植者的调研数据,采用倾向得分匹配与中介效应模型,实证分析家庭农场对绿色生产行为的影响,以及农业培训在家庭农场与绿色生产行为之间的中介作用。结果表明：样本中超过45%的水稻种植户未采用绿色生产技术,化肥农药费用投入较高;家庭农场对绿色生产行为有促进作用,家庭农场经营者不仅会采取更多绿色生产技术,还会降低化肥农药的投入,而且家庭农场可以促进经营者参与农业培训,而农业培训在家庭农场与绿色生产行为之间起到中介作用。因此为促进农业绿色生产行为,应鼓励符合条件的生产者申请家庭农场,树立模范标杆,并通过多种途径的培训与宣传提倡规范生产、节能增效的绿色生产,不断推动农业的绿色生产发展。     

学术论文网络首发的困境及其解决路径——基于中国知网学术期刊网络首发出版发布系统的分析

【目的】 探讨学术论文网络首发中存在的困境,并提出解决路径,为期刊编辑部提供参考。【方法】 在与传统出版流程对比的基础上,以中国知网学术期刊网络首发出版发布系统为研究对象,从期刊编辑部、作者、网络出版商和期刊管理部门的角度,分析学术论文网络首发过程中存在的困境,并寻找解决困境的方法。【结果】 学术论文网络首发的困境主要体现在:网络出版商、期刊编辑部和作者三者之间的利益之争,网络出版权及其利益的高度垄断制约着期刊的发展;期刊管理政策与网络首发的内在要求之间的不匹配;现代期刊编辑角色转型带来的编辑角色失调;首发论文的校对标准之争;网络首发论文的认证、引用、评价和撤稿问题;网络首发可能导致论文多个版本共存,容易引起阅读障碍;纸刊存在价值的争议。【结论】 要破解网络首发(网络出版)的困境,最终需要平衡网络出版商、编辑部和作者之间的利益;期刊编辑需要转变为全能编辑;建立基于单篇论文网络首发的期刊出版新模式;实行以网络首发或纸刊出版为最终出版模式的单轨制出版;国家改革网络首发模式下的期刊管理办法,重点监管网刊。     

Ecological principle meets cancer treatment: treating children with acute myeloid leukemia with low-dose chemotherapy

Standard chemotherapy regimens for remission induction of pediatric acute myeloid leukemia (AML) are associated with significant morbidity and mortality. We performed a cohort study to determine the impact of reducing the intensity of remission induction chemotherapy on the outcomes of selected children with AML treated with a low-dose induction regimen plus granulocyte colony stimulating factor (G-CSF) (low-dose chemotherapy (LDC)/G-CSF). Complete response (CR) after two induction courses was attained in 87.0% (40/46) of patients receiving LDC/G-CSF. Post-remission therapy was offered to all patients, and included standard consolidation and/or stem cell transplantation. During the study period, an additional 94 consecutive children with AML treated with standard chemotherapy (SDC) for induction (80/94 (85.1%) of the patients attained CR after induction II, P = 0.953) and post-remission. In this non-randomized study, there were no significant differences in 4-year event-free (67.4 vs. 70.7%; P = 0.99) and overall (70.3 vs. 74.6%, P = 0.69) survival in the LDC/G-CSF and SDC cohorts, respectively. After the first course of induction, recovery of white blood cell (WBC) and platelet counts were significantly faster in patients receiving LDC/G-CSF than in those receiving SDC (11.5 vs. 18.5 d for WBCs (P < 0.001); 15.5 vs. 22.0 d for platelets (P < 0.001)). To examine the quality of molecular response, targeted deep sequencing was performed. Of 137 mutations detected at diagnosis in 20 children who attained hematological CR after two courses of LDC/G-CSF (n = 9) or SDC (n = 11), all of the mutations were below the reference value (variant allelic frequency <2.5%) after two courses, irrespective of the treatment group. In conclusion, children with AML receiving LDC/G-CSF appear to have similar outcomes and mutation clearance levels, but significantly lower toxicity than those receiving SDC. Thus, LDC/G-CSF should be further evaluated as an effective alternative to remission induction in pediatric AML.     

中国土壤微生物组:进展与展望

文章分析了国际土壤微生物组的研究现状和发展趋势,阐述了土壤微生物组研究的前沿科学问题,综述了中国土壤微生物组的主要科研进展,提出了中国土壤微生物组研究的机遇和挑战,探讨了土壤-微生物系统功能及其调控所需的主要技术手段与能力建设,期望通过"土壤-微生物系统功能及其调控"中科院战略性先导科技专项研究,为深度发掘土壤微生物组资源,定向调控土壤微生物组功能,解决我国经济社会发展面临的生态环境、农业生产及资源瓶颈等问题起到应有的贡献。     

Input-output finite-time stability for networked control systems with memory event-triggered scheme

This paper has investigated the input-output finite time stability (IO-FTS) for a class of networked control systems (NCSs) with network-induced delay. To reduce the frequents of packets transmission, a novel memory event-triggered scheme (METS) has been proposed. Different from existing event-triggered schemes, the proposed METS can make use of certain released packets to generate new event. By this way, the event generator can do more precise decision and better control performance can be expected. By using a Lyapunov functional method, sufficient condition for the IO-FTS of NCSs has been derived. Then a co-design method is proposed to obtain the memory feedback gains and parameters of the METS. Finally, a simulation example is carried out and the effectiveness of the designed METS is validated. The IO-FTS of NCSs with solved memory feedback gains is also confirmed.