检索结果-南通市图书馆

兼顾效率与公平:农村集体经济发展与农民农村共同富裕

在线全文

学校读者我要写书评

暂无评论

经济学家 2024年第1期 118-128页

作者：栾健张哲晰农业农村部农村经济研究中心

发展农村集体经济是促进农民农村共同富裕的重要力量和核心载体。本文基于效率与公平视角构建了农村集体经济发展促进农民农村共同富裕的理论分析框架,并利用2020—2022年中国土地经济调查(CLES)面板数据进行实证检验。研究得出:农村集... 详细信息

发展农村集体经济是促进农民农村共同富裕的重要力量和核心载体。本文基于效率与公平视角构建了农村集体经济发展促进农民农村共同富裕的理论分析框架,并利用2020—2022年中国土地经济调查(CLES)面板数据进行实证检验。研究得出:农村集体经济发展能够有效促进农户增收,多种检验均验证了研究结果的稳健性;机制分析表明,农村集体经济发展通过促进农地流转市场和农村劳动力市场发育带动农户增收,具体表现为提升农地流转数量和质量、促进农户就地就近稳定就业;考虑乡村治理环境异质性的检验发现,实施农村集体经济股份合作制改革、村干部文化程度较高、村两委“一肩挑”的村庄,农村集体经济发展对农户的增收效应更强;拓展讨论表明,农村集体经济发展对低收入农户群体的增收效应更为明显、能够有效缩小收入差距,在保障效率的同时兼顾了公平。因此,以农村集体经济发展为抓手,引导农地流转市场和农村劳动力市场发育,协同推进乡村治理环境优化,将会是实现农民农村共同富裕的重要渠道。

关键词：农村集体经济农地流转市场农村劳动力市场农民增收共同富裕

全装配式UHPC-RC箱形组合梁快速化施工方案探讨

在线全文

学校读者我要写书评

暂无评论

工程与建设 2024年第1期38卷 125-128页

作者：李剑鸾殷亮安徽省交通规划设计研究总院股份有限公司安徽合肥230088 公路交通节能环保技术交通运输行业研发中心安徽合肥230088

全装配式UHPC-RC箱形组合梁是一种基于UHPC新材料并采用体外预应力束进行节段拼接的新型组合梁结构,其成桥受力性能与施工方案关系密切。本文以滁州至天长高速公路上跨1×40 m UHPC-RC箱形组合梁人行天桥为背景,采用有限元软件对两种少... 详细信息

全装配式UHPC-RC箱形组合梁是一种基于UHPC新材料并采用体外预应力束进行节段拼接的新型组合梁结构,其成桥受力性能与施工方案关系密切。本文以滁州至天长高速公路上跨1×40 m UHPC-RC箱形组合梁人行天桥为背景,采用有限元软件对两种少支架施工方案进行建模计算,得出不同施工方案下结构构件的受力特征及材料性能需求;同时结合施工机具、场地及工期等需求,对全装配式UHPC-RC箱形组合梁的四种施工方案进行综合分析,得出不同条件下适用的施工方案;最后提出一种新的思路,即先在工厂进行节段桥面板与节段UHPC主梁间的叠合,再把叠合节段运至现场进行纵、横向拼接,该方法可用于全装配式UHPC-RC箱形组合梁的快速化施工。

关键词：全装配式 UHPC-RC箱形组合梁 UHPC 体外预应力束快速化施工

FLOW RESISTANCE AND HEAT TRANSFER CHARACTERISTICS OF A NEW-TYPE PLATE HEAT EXCHANGER

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2008年第4期20卷 524-529页

作者： luan Zhi-jian ZHANG Guan-min TIAN Mao-cheng FAN Ming-xiu School of Energy and Power Engineering Shandong University Jinan 250061 China

A new-type corrugation Plate Heat Exchanger （PHE） was designed. Results from both numerical simulations and experiments showed that the flow resistance of the working fluid in this new corrugation PHE, compared with the traditional chevron-type one, was decreased by more than 50%, and corresponding heat transfer performance was decreased by about 25%. The flow field of the working fluid in the corrugation PHE was transformed and hence performance difference in both flow resistance and heat transfer was generated. Such a novel plate, consisting of longitudinal and transverse corrugations, can effectively avoid the problem of flow path blockage, which will help to extend the application of PHEs to the situation with unclean working fluids.

关键词： plate heat exchanger flow resistance heat transfer numerical simulation blockage

Tailoring the separation performance of a carbon nanotube-based mixed matrix membrane decorated with metal–organic framework

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2023年第12期64卷 87-95页

作者： Hui-Yong Wu Hong-Xin Fu Yu Liu Xiao-Sa Zhang Wen-Ze Li jian luan College of Science Shenyang University of Chemical TechnologyShenyang 110142China College of Sciences Northeastern UniversityShenyang 110819China

Synthesis of mixed matrix membranes(MMM)using carbon nanotubes(CNTs)has shown great prospects for achieving excellent selective separation because of its special ***,the preparation of highly selective MMM faces challenges,which is attributed to the obstacles encountered by CNTs dispersion in polymer matrix and elimination of interface defects.A novel CNT-based composite decorated with metal–organic framework(MOF)was synthesized and applied to the preparation of *** was post modified,and then carboxyl groups were inserted on the outer surface of *** synthetic MMM(Cu-MOF-en@MWCNT)not only has selective adsorption on dyes,but also has selective photodegradation on *** method of using CNTs to wrap the outside of MOF has great potential in dye *** performance of MMM was further improved by decorating MOF on the filler to improve the selectivity to the designated dye.

关键词： Composites Carbon nanotube Metal-organic framework Organic crosslinking Selectivity Adsorbents

Two New Inorganic-organic Hybrid Compounds Constructed from Different Polymolybdates and Transition Metal-amine Subunits

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2015年第3期31卷 337-341页

作者： WANG Xiuli LIU Danna HAN Na LIN Hongyan luan jian TIAN Aixiang Liaoning Province Silicon Materials Engineering Technology Research Centre Department of ChemistryBohai University Jinzhou 121000 P.R.China

Two new polyoxometalate（POM）-based hybrid compounds, [Cu（en）][H4Mo4O16]0.5（1）（en=ethylenediamine） and [Ag（3-CsH6N2）2][H2PMo12O40]（2）（3-C5H6N2=3-aminopyridine）, containing different transition metal- amine subunits were hydrothermally synthesized and characterized by elemental analyses, infrared spectroscopy and single-crystal X-ray diffraction. For compound 1, each [H4Mo4O16]4-（M04O16） cluster was linked to four neighboring Mo4O16 clusters through four [Cu（en）]2＋ subunits to yield a （2,4）-connected 2D layer, which was further extended to a 3D supramolecular network via hydrogen bonding interactions. For compound 2, the adjacent [H2PMo12O40]- clusters were bridged by [Ag（3-C5H6N2）2]＋ subunits to generate a 1D chain. The electrochemical behaviors and the photoca- talytic activities of compounds 1 and 2 were studied in detail.

关键词： Polyoxometalate Metal-amine unit Crystal structure Electrochemical property Photocatalysis

Effect of Reaction Conditions on the Assembly, Structures and Fluorescent Sensing Behaviors of Cd（II） Metal-organic Complexes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2016年第1期32卷 8-15页

作者： LE Mao luan jian ZHAO Xunzhang TANG Tang CHEN Panwen LIU Guocheng LIN Hongyan Department of Chemistry Bohai University Jinzhou 121013 P. R. China

Three Cd（II） metal-organic complexes, namely [Cd（phen）2Cl2]（1）, [Cd（phen）Cl2]（2） and [Cd（phen）（cam）]. H2O（3）（phen=1,10-phenanthroline, H2cam=camphoric acid）, were hydrothermally synthesized using Cd2＋, phen and Hacam as raw materials under different conditions of pH values, reaction temperatures or reactant ratios. The prepared complexes were structurally characterized by means of single-crystal X-ray diffraction, and the results show that complex 1 is a 2D supramolecular complex, which consists of [Cd（phen）2Cl2] mononuclear subunits, while complex 2 shows a 1D chain structure, in which Cd（II） ions are connected by chloride（Cl ） bridges, with phen hanging on both sides of the chain. No cam anions have been observed in the structures of complexes 1 and 2. In complex 3, cam connects Cd（lI） ions to construct a 2D network, in which phen acts as terminal ligands. The adjacent 1D chains for complex 2 and the adjacent 2D layers for complex 3 are further linked by hydrogen bonding interac- tions or π-π intermolecular interactions to form 3D supramolecular networks, respectively. The effects of reaction conditions on the assembly and structures of the complexes have been discussed. The fluorescent and photocatalytic properties of complexes 1-3 and the fluorescent sensing behaviors of complexes 2 and 3 have also been investigated.

关键词： Cd(II) complex 1,10-Phenanthroline Camphanic acid Fluorescent sensing behavior Photocatalytic property

Treatment of drug-resistant epilepsy with vagus nerve stimulation m review of 45 cases

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Medical Journal 2011年第24期 4184-4188页

作者： BAO Min ZHOU jian luan Guo-ming Department of Functional Neurosurgery Beijing Sanbo BrainHospital Capital Medical University Beijing 100093 China

Background Vagus nerve stimulation （VNS） is an alternative treatment for drug-resistant epilepsy （DRE）. The study aimed to explore the potential factors of prognosis, safety and effect of VNS treatment in patients with DRE. Methods We retrospectively examined 45 cases of DRE that received VNS treatment in our center from June 2004 to June 2010 and analyzed the parameters （age of patient receiving VNS, seizure frequency before and after VNS as well as treatment duration） by Student＇s t test, Fisher＇s exact and Mann-Whitney U tests, and multivariate Logistic regression. Results The overall response rate was 64% （29/45）, 67% （6/9） for adults and 64% （23/36） for children, with no significant difference （P=0.28）. Twenty-two cases had been in VNS therapy for over 1 year with a treatment efficacy of 73% （16/22）, whereas 23 cases had been in VNS therapy no more than 1 year with a treatment effecacy of 57% （13/23）, and has statistically significant difference （P=0.03）. The main side effect included hoarseness of voice and cough. One patient＇s device was removed due to infection. One patient＇s VNS was half-way terminated due to seizure aggravation. One patient died due to status epilepticus. Conclusions VNS is a safe and effective treatment for DRE. Duration of VNS therapy may be a crucial factor on prognosis.

关键词： epilepsy vagus nerve stimulation treatment outcome safety prognosis

CFTR特异性抑制剂CFTRinh-172的高通量筛选与研究进展

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

食品与机械 2018年第10期34卷 179-184页

作者：栾剑吉林师范大学生命科学学院吉林四平136000

小分子特异性抑制剂CFTRinh-172是该领域科研试验的标准参照物。文章梳理归纳了多年来对CFTRinh-172的研究进展,从化学结构、作用机制和药代动力学,以及在霍乱、多囊肾病和白血病等恶性疾病的治疗研究和药物研发等方面,全面阐述了CFTRin... 详细信息

小分子特异性抑制剂CFTRinh-172是该领域科研试验的标准参照物。文章梳理归纳了多年来对CFTRinh-172的研究进展,从化学结构、作用机制和药代动力学,以及在霍乱、多囊肾病和白血病等恶性疾病的治疗研究和药物研发等方面,全面阐述了CFTRinh-172作为CFTR氯离子通道的特异性小分子抑制剂的重要意义,剖析其水溶性、安全性等潜在的问题。

关键词：囊性纤维化跨膜电导调节因子 CFTRinh-172 高通量筛选小分子化合物库分子药物靶点

Analysis on the Relationship between Geological Disasters and Precipitation in Zhuanghe Region

在线全文

学校读者我要写书评

暂无评论

Meteorological and Environmental Research 2014年第8期5卷 28-30页

作者： Wu Qi Zou Jihui Wu Wenjie luan jian Zhuanghe Meteorological Bureau in Liaoning Province Lightning Protection Technology Service Center in Liaoning Province

To improve relevance and timeliness of forecasting and early warning for precipitation-type geological disasters in Zhuanghe City, by using case information of geological disasters and corresponding precipitation data in Zhuanghe City during 2009 -2011, the relationship between geological disasters and precipitation was analyzed. Results showed that precipitation-type geological disasters in Zhuanghe City had close relationships with precipitation intensity in prior period and rainfall on the day. The research had important actual significance for prevention of geological disasters.

关键词： Geological disasters Precipitation Zhuanghe City China