检索结果-南通市图书馆

Evaluation of tomato fruit quality response to water and nitrogen management under alternate partial root-zone irrigation

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2017年第5期10卷 85-94页

作者： Yang Hui Cao Hongxia Hao Xinmei Guo Lijie Li hongzheng Wu Xuanyi Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education Northwest A&F UniversityYanglingShaanxi 712100China Center for Agricultural Water Research in china China Agricultural UniversityBeijing 100083China

A pot experiment was conducted to investigate the effects of different water and nitrogen supply amounts on the comprehensive assessment of tomato fruit quality and root growth parameters under alternate partial root-zone *** upper irrigation limitations(i.e.70%(W1),80%(W2)and 90%(W3)of field capacity,respectively)and three N-fertilizer levels(i.e.0.18(N1),0.30(N2)and 0.42(N3)g/kg soil,respectively)were arranged with a randomized complete block design,and alternate partial root-zone irrigation method was *** showed that fruit yields under deficit irrigation(W1 and W2)were decreased by 6.9%and 2.0%respectively compared with W3 under N1 *** of tomato under W1N1 and W1N2 combinations were also reduced by 10.3%and 7.2%,respectively compared with W1N3 *** dry weight,root length,root surface area and root volume were all increased in W1N2 *** to two-way ANOVA,the root parameters except root dry weight,were extremely sensitive to water,nitrogen and the cross effect of the two ***(total soluble solids),SS(soluble sugars)and OA(organic acid)in the fruits increased with the decrease in irrigation water,OA and NC reduced with decreasing amount of ***,within an appropriate range,as more irrigation water and nitrogen were applied,the higher VC(vitamin C)and lycopene contents were identified in the ***,the combinational evaluation method(*** method and gray relational analysis)showed that W2N2 ranked highest in comprehensive fruit ***,considering the tradeoff between fruit comprehensive quality and yields,upper irrigation limitation of 80%θf and N-fertilizer of 0.30 g/kg soil with alternate partial root-zone irrigation was the optimal cultivation strategy for the greenhouse tomato in autumn-winter season in northwest china.

关键词： greenhouse tomato alternate partial root-zone irrigation water and nitrogen root growth comprehensive fruit quality

Graphene and cobalt phosphide nanowire composite as an anode material for high performance lithium-ion batteries

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2016年第3期9卷 612-621页

作者： Jun Yang Yu Zhang Chencheng Sun hongzheng Liu Laiquan Li Weili Si Wei Huang Qingyu Yan Xiaochen Dong Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) Nanjing Tech University (NanjingTech) Nanjing 211816 China School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore

The synthesis of a composite of cobalt phosphide nanowires and reduced graphene oxide （denoted CoP/RGO） via a facile hydrothermal method combined with a subsequent annealing step is reported. The resulting composite presents large specific surface area and enhanced conductivity, which can effectively facilitate charge transport and accommodates variations in volume during the lithiation/de-lithiation processes. As a result, the CoP/RGO nanocomposite manifests a high reversible specific capacity of 960 mA·h-g-1 over 200 cycles at a current density of 0.2 A·g-1 （297 mA·h·g-1 over 10,000 cycles at a current density of 20 A.g-1） and excellent rate capability （424 mA·h·g-1 at a current density of 10 A·g-1）.

关键词： cobalt phosphide nanowires anodes lithium-ion battery

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

内漏测量技术中浓度衰减法应用模拟研究

核电子学与探测技术 2024年第2期44卷 292-296页

作者：张雪平李晓晨张渊吴涛陈建利梁飞任宏正石旭中国辐射防护研究院中核集团放射性气体净化技术重点实验室太原030006

核电厂主控室作为核电厂运行的关键位置,在正常和应急情况下保证工作人员在主控室可居留性尤为重要。对核电厂主控室进行可居留性内漏评价能够判断主控室环境是否处于正常安全运行状态,并根据评价结果发现主控室存在的问题进而提出解决... 详细信息

核电厂主控室作为核电厂运行的关键位置,在正常和应急情况下保证工作人员在主控室可居留性尤为重要。对核电厂主控室进行可居留性内漏评价能够判断主控室环境是否处于正常安全运行状态,并根据评价结果发现主控室存在的问题进而提出解决方案,是保障主控室正常安全运行的一种评价技术手段。主控室可居留性内漏评价采用示踪气体试验方法,通过浓度衰减法在简单区域进行内漏测量技术模拟研究,结果表明:示踪气体浓度在40 min内能够达到混合均匀,各采样点示踪气体浓度相对标准偏差为3.71%,示踪气体浓度随着时间推移混合均匀性不断提高,房间空气交换次数为0.3/h,内漏量为45 m^(3)/h,空气交换次数的不确定度为0.3/h。采用浓度衰减法进行内漏测量模拟研究,通过对示踪气体注入、采样点布置,气体搅拌装置分布及示踪气体取样分析等过程进行控制,能够实现示踪气体在简单区域内快速混合均匀达到平衡状态。

关键词：浓度衰减法内漏示踪气体空气交换可居留性

Improved Photovoltaic Performance of MEH-PPV/PCBM Solar Cells via Incorporation of Si Nanocrystals

在线全文

学校读者我要写书评

暂无评论

chinese Journal of Chemistry 2013年第11期31卷 1380-1384页

作者： Quanxiang Yan Lijian Zuo Zhuowei Gu Ligong Yang Rong Wang Mang Wang hongzheng Chen State Key Lab of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and Functionalization & Department of Polymer Science and Engineering Zhejiang University Hangzhou Zhejiang 310027 China

We have studied the effect of silicon nanocrystals （SiNCs） as a third component on performance of organic bulk heterojunction solar cells composed of poly[2-methoxy,5-（2＇-ethylhexyloxy）-l,4-phenylene vinylene] （MEH- PPV）：[6,6]-phenyI-C61-butyric acid methyl ester （PCBM） blend film. By adding suitable amounts of SiNCs into MEH-PPV：PCBM blend, the device performance such as external quantum efficiency, short circuit current density （Js（）, and power conversion efficiency （PCE） improved. Incorporation of 2.5% SiNCs in the blend led to 13.6% improvement of Jsc, which in turn resulted in 18% improvement of PCE up to 2.28%. The improved performance was mainly due to the improvements both in the charge generation from the interface of MEH-PPV/SiNCs and the charge collection at the cathode.

关键词： polymer/fullerene solar cell interface silicon nanoparticles exciton disassociation thin films

以市场主体满意度为导向的创业营商环境优化研究--以D市为例

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

经济研究导刊 2024年第8期 108-111页

作者：魏红征钟杏郑思涵王明宇东莞理工学院法律与社会工作学院广东东莞523808

创业营商环境是有效激发城市创业活力、提升经济发展内生动力的重要依托,市场主体满意度可直观地反映创业营商环境水平与优化方向。通过满意度调查与个案访谈发现,D市市场主体对于创业营商环境总体满意度较高,但仍存在创业金融环境满意... 详细信息

创业营商环境是有效激发城市创业活力、提升经济发展内生动力的重要依托,市场主体满意度可直观地反映创业营商环境水平与优化方向。通过满意度调查与个案访谈发现,D市市场主体对于创业营商环境总体满意度较高,但仍存在创业金融环境满意度偏低、生产经营成本高、创业扶持政策不完善、缺乏专业人才等问题,因此建议强化减税补贴扶持、创业政策宣传效果、创业公益服务,完善人才引进机制,以及实现创业帮扶精准化,以期对其他城市创业营商环境建议也有一定的参考价值。

关键词：营商环境创业环境满意度绩效评价

维普期刊数据库博看期刊

A multifunctional and scalable fullerene electron transporting material for efficient inverted perovskite solar cells and modules

在线全文

学校读者我要写书评

暂无评论

Science china Chemistry 2023年第6期66卷 1795-1803页

作者： Kangrong Yan Ziqiu Shen Benfang Niu Yanchun Huang Di Wang Emely Gu Buyi Yan Jizhong Yao hongzheng Chen Chang-Zhi Li State Key Laboratory of Silicon Materials Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China Hangzhou Microquanta Semiconductor Co.LTD. Innovation ParkHangzhou 310027China

The interfacial properties between charge transporting material and perovskite(PVSK)play critical roles in governing the photovoltaic performances of perovskite solar cells(PVSCs).Herein,we develop a multifunctional fulleropyrrolidine(FMG)as an electron transporting material(ETM),which facilitates the construction of efficient and stable inverted PVSCs and *** revealed that the facile and scalable FMG possesses not only excellent electron extraction capabilities,but also multi-groups to simultaneously passivate PVSKs via Lewis acid-base and hydrogen bonding *** coating of FMG onto PVSK interestingly yields a dense and interactive layer with the graded ETM-PVSK heterojunction *** a result,FMGbased PVSCs demonstrate a champion efficiency of 23.8%,outperforming 21.0%of PCBM-based *** could also be utilized to improve photovoltaic performance of large-scale *** addition,FMG has successfully elongated the lifetime of the corresponding PVSCs,maintaining 85%of the initial performance after the continuous 60-day one sun equivalent illumination in ambient.

关键词： fullerene derivative interface electron transporting material perovskite solar cells

Hydrological effects of alpine permafrost in the headwaters of the Urumqi River,Tianshan Mountains

在线全文

学校读者我要写书评

暂无评论

Research in Cold and Arid Regions 2016年第3期8卷 241-249页

作者： TianDing Han hongzheng Pu Peng Cheng KeQin Jiao State Key Laboratory of Cryospheric Sciences Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of SciencesLanzhouGansu 730000China Urumqi Meteorological Bureau UrumqL Xinjiang 830002China

Against the background of climate change, alpine permafrost active layers have shown a gradual thickening trend and the hydrothermal conditions have undergone significant changes in the Tianshan Mountains and the Qinghai-Tibet Plateau, china. At the ice-free cirque basins in the headwaters of the Urumqi River （hereafter referred to as the Ice-Free Cirque） in eastern Tianshan, china, the hydrological effects of the alpine permafrost active layers appear to have also exhibited sig- nificant changes recently. The increasing trend of local precipitation is clear in May and June. The onset of winter and spring snowmelt runoff clearly lags behind increases of air temperature, and the runoff peak appears near the beginning of the melting season, which results in the spring rtmoff increasing. In summer, runoff decreases strongly and the maximum runoff occurs earlier. In our analysis of meteorological and hydrologic data from 1959 to 2010, the runoffand precipitation changes are significantly correlated. In the initial stage of runoff, the runoff-producing process is mainly under the control of the soil water content and soil temperature in the 0-30 cm active layers. Spring precipitation and snowmelt water are mainly involved in the processes of infiltration and evaporation while some melt water infiltrates into the seasonal thawed layer and stays above the frozen layers. During the strong ablation period in summer, the runoff-generating process is mainly controlled by soil water content in the active layers deeper than 60 cm. In the active layer, precipitation and sea- sonal snowmelt water infiltrates, migrates, collects, and then forms runoff.

关键词： permafrost active layer air temperature precipitation runoff headwaters of the Urumqi River

江西九连山国家级自然保护区吉丁虫科种类调查及三新种记述(鞘翅目)

在线全文

学校读者我要写书评

暂无评论

Entomotaxonomia 2024年第1期46卷 33-46页

作者：彭忠亮李红征吴宗仁朱振平彭观地宋武云王辉江西省林业有害生物防治检疫中心江西南昌330038 江西九连山国家级自然保护区江西龙南341700

对中国江西九连山国家级自然保护区吉丁虫科种类作了全面采集调查,从所获大量标本中共鉴定出该科25个种及亚种,归属于4亚科,其中包括3新种:龙南角吉丁Habroloma(Parahabroloma)***.,九连山角吉丁H.(P.)***.及小角吉丁H.(P.)***.。对所... 详细信息

对中国江西九连山国家级自然保护区吉丁虫科种类作了全面采集调查,从所获大量标本中共鉴定出该科25个种及亚种,归属于4亚科,其中包括3新种:龙南角吉丁Habroloma(Parahabroloma)***.,九连山角吉丁H.(P.)***.及小角吉丁H.(P.)***.。对所有种类采集资料作了记录,对新种作了详尽描述并提供了正反面全图及必要的特征图。

关键词：多食亚目吉丁甲总科分类

Donor-acceptor(D-A)terpolymers based on alkyl-DPP and t-BocDPP moieties for polymer solar cells

在线全文

学校读者我要写书评

暂无评论

chinese Chemical Letters 2017年第12期28卷 2223-2226页

作者： Fateh Ullah Sun Qian Weitao Yang Muhammad Naeem Shah Zhongqiang Zhang hongzheng Chen Chang-Zhi Li MOE Key Laboratory of Macromolecular Synthesis and Functionalization State Key Laboratory of Silicon MaterialsDepartment of Polymer Science andEngineeringZhejiang UniversityHangzhou 310027China

A series of low band gap terpolymers based on 4,8-bis（5-（2-ethylhexyl）thiophen-2-yl）benzo[l,2-b：4,5- b＇]dithiophene （BDTr） and diketopyrrolopyrrole （DPP） with varied solubilizing groups （i.e., tert- butoxycarbonyl, t-Boc and 2-octyldodecyl） are developed as electron donors for bulk heterojunction （BHJ） polymer solar cells （PSCs）. The results reveal that the one with 50% t-Boc concentration （P3） performs better than the other terpolymers used in this study in conventional PSC devices with a power conversion efficiency of 2.92%.

关键词： Conjugated polymerOrganic semiconductorPolymer solar cellsBulk heterojunctionDiketopyrrolopyrrole