检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

基于分布式多层数据库的图书管理系统设计

信息与电脑 2024年第13期36卷 82-84,88页

作者：王云英无锡旅游商贸高等职业技术学校江苏无锡214000

本研究旨在设计一个基于分布式多层数据库的图书管理系统,以提高图书管理的效率和可靠性。系统采用分布式数据库架构,将数据存储在多个位置分散的服务器上,以实现数据的高可用性和灾难恢复能力。本文深入分析了该系统在不同网络条件、... 详细信息

本研究旨在设计一个基于分布式多层数据库的图书管理系统,以提高图书管理的效率和可靠性。系统采用分布式数据库架构,将数据存储在多个位置分散的服务器上,以实现数据的高可用性和灾难恢复能力。本文深入分析了该系统在不同网络条件、负载和数据规模下的性能表现。实验结果显示,在复杂场景下尽管系统性能有所下降,但其总体稳定性和数据一致性仍有较好表现。

关键词：分布式数据库多层架构图书管理系统性能评估

在线全文

学校读者我要写书评

暂无评论

放牧显著降低中国草地生态系统土壤含水量

草业科学 2024年第1期41卷 59-66页

作者：王云英裴薇薇王新文焱斌杜岩功中国科学院西北高原生物研究所青海西宁810008 中国科学院大学北京100049

本研究利用Meta分析方法,对中国草地生态系统已开展的258个关于放牧对于中国草地生态系统土壤含水量的试验结果进行综合分析。结果表明:放牧对中国草地0-30 cm土壤含水量影响的平均效应值为-0.111,降低幅度约10.51%,达到0.01显著性检验... 详细信息

本研究利用Meta分析方法,对中国草地生态系统已开展的258个关于放牧对于中国草地生态系统土壤含水量的试验结果进行综合分析。结果表明:放牧对中国草地0-30 cm土壤含水量影响的平均效应值为-0.111,降低幅度约10.51%,达到0.01显著性检验水平。放牧对表层土壤0-10 cm土层影响影响最高,随着土层加深,平均效应值均呈现降低趋势,且放牧分别对草甸草原、典型草原和荒漠草原土壤含水量影响作用最强。温度、降水量、海拔和土壤容重4种环境因子贡献率最大。放牧分别可解释93.90%、87.66%、90.64%的对0-10、10-20和20-30 cm土层的效应值变异。全球增温可能会显著降低放牧草地土壤含水量,为了提升草地土壤含水量应采用轻度放牧制度。本研究为明晰放牧草地生态系统水分变化提供了理论基础。

关键词：植被类型放牧土层水分变化相对贡献率效应值 Meta分析

在线全文

学校读者我要写书评

暂无评论

祁连山区青海云杉林碳汇特征及调控因子

中国农业科技导报 2024年第1期26卷 226-233页

作者：裴薇薇杨喆王云英王新杜岩功中国科学院西北高原生物研究所西宁810008 中国科学院大学北京100049 青海大学西宁810001

祁连山区是我国西部重要的生态安全屏障和固碳场所。为准确评估祁连山区青海云杉林生态系统生长季碳汇特征,利用涡度相关技术并结合增强回归树模型与结构方程模型,研究生长季其碳通量变化特征及其环境影响机制。结果表明,青海云杉林生... 详细信息

祁连山区是我国西部重要的生态安全屏障和固碳场所。为准确评估祁连山区青海云杉林生态系统生长季碳汇特征,利用涡度相关技术并结合增强回归树模型与结构方程模型,研究生长季其碳通量变化特征及其环境影响机制。结果表明,青海云杉林生长季净生态系统碳交换(net ecosystem carbon exchange,NEE)日变化呈“V”型,CO_(2)通量变化范围在-0.71~0.08 mg CO_(2)·m^(-2)·s^(-1),季节尺度NEE变化范围在-20.93~11.75 g C·m^(-2),月均碳吸收量(188.27±17.85)g·m^(-2),生长季累积碳吸收941.34 g·m^(-2)。增强回归树模型揭示植被指数对净生态系统碳交换量相对贡献率最高,为50.3%,其次是净辐射,为15.9%。结构方程模型表明,植被指数与相对湿度对净生态系统碳交换量的直接作用系数分别为0.61与-0.17。多元逐步回归模型表明植被指数与相对湿度对NEE具有显著影响(R^(2)=0.74,P<0.01)。随着植被指数增加,祁连山森林生态系统碳汇功能显著增强。结果为准确评估祁连山区青海云杉林生态系统碳汇能力提供科学依据。

关键词：涡度相关青海云杉林碳通量环境因子

人型支原体致外科手术后切口感染的临床特征及耐药性分析

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

重庆医学 2024年第8期53卷 1137-1142页

作者：唐朋牟迪王云英重庆医科大学附属第二医院检验科重庆400010

目的分析人型支原体(Mh)致外科手术后切口感染的临床特征及耐药性。方法收集该院2020年1月至2022年9月Mh致外科手术后感染患者共8例,同时选取8例同期健康体检者作为健康对照组,对病例资料进行汇总分析。结果Mh引起的外科手术后感染部位... 详细信息

目的分析人型支原体(Mh)致外科手术后切口感染的临床特征及耐药性。方法收集该院2020年1月至2022年9月Mh致外科手术后感染患者共8例,同时选取8例同期健康体检者作为健康对照组,对病例资料进行汇总分析。结果Mh引起的外科手术后感染部位主要集中在手术局部切口,症状表现为轻微的红肿热痛及切口愈合不良,且使用β-内酰胺类药物经验性抗感染治疗,但效果不佳,感染周期11~24 d;在获得微生物学证据后,调整用药方案进行目标治疗,患者切口感染得到有效改善。与健康对照组比较,感染组白细胞计数、中性粒细胞百分比、C反应蛋白明显升高(P0.05)。Mh在血琼脂培养基培养48 h仅可见针尖样细小菌落,且革兰氏染色菌体不着色。Mh对强力霉素、美满霉素、交沙霉素、壮观霉素、加替沙星敏感性较好,而对其他大环内酯类、氨基糖苷类和喹诺酮类药物耐药率较高。结论Mh引起的外科手术后切口感染比较少见,充分认识该病原菌的感染特征,有利于患者的诊治。

关键词：人型支原体外科手术感染临床特征药物敏感性

维普期刊数据库博看期刊

Accelerated Ageing Tests for Evaluations of a Durability Performance of Glass-fiber Reinforcement Polyester Composites

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2010年第6期26卷 572-576页

作者： yunying wang Jiangyan Meng Qing Zhao Shuhua Qi School-of Science Northwestern Polytechnical University Xi'an 710072 China Department of Materials Science and Engineering Nanchang Hangkong University Nanchang 330063 China

The paper presented accelerated ageing test results of a durability study on ortho-phthalic anhydride-type unsaturated polyester resin （191#） and its glass-fiber reinforcement polyester composites （GFRPC）. The samples were exposed in an artificial xenon arc lamp ageing cell or a thermo-oxidative ageing cell. Morphology and gloss of the specimens were investigated by using a microscope and a gloss-meter, respectively. The tensile strength, bending strength and inter-laminar shear strength （ILSS） of GFRPC were tested before and after exposure, and were considered to evaluate the durability performance of this material. The polyester resin was analyzed by fourier transform infrared （FT-IR） spectroscopy. The results showed that the glossiness of the specimens got worse and some cracks appeared on their surface during the course of ageing, the tensile strength and bending strengths of the specimens first increased and then decreased. The ILSS of the composites decreased after they were aged in the xenon arc lamp cell, but increased while they were aged in the thermo-oxidative cell. The changes of these trends become more obvious during ageing in the xenon arc lamp cell, so the main influencing factor leading to the failure of this material is UV irradiation.

关键词： Ortho-phthalic Artificial thermo-oxidation ageing Artificial xenon arc lampageing UV irradiation Inter-laminar shear strength (ILSS)

De novo assembly of the seed transcriptome and search for potential EST-SSR markers for an endangered, economically important tree species: Elaeagnus mollis Diels

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2020年第3期31卷 759-767页

作者： Yulin Liu Siqiao Li yunying wang Pingyu Liu Wenjing Han College of Forestry Northwest A&F UniversityYangling 712100People’s Republic of China

Seeds of Elaeagnus mollis(Elaeagnaceae) produce an edible oil and contain more vitamin E(Ve) than major oil-seed crops. Despite its economic value, there is no information on its genome sequence. Here, we used the Illumina platform to determine the seed transcriptome of *** to identify the genes related to Ve biosynthesis and potential simple sequence repeat(SSR) markers. In total, 100,999 unigenes were obtained with an average length of 605 bp and N50 of 985 bp. Of these unigenes,52,256(51.7%) were annotated in at least one public database(NT, NR, PFAM, Swiss Prot, KOG, KO, and GO)in searches using blastn/x. The unigene annotation identified 15 unigenes encoding six enzymes(GGR, HPPD,HPT/VTE2, MPBQ-MT/VTE3, TC/VTE1, and c-TMT/VTE4) putatively involved in Ve biosynthesis. In addition,16,810 SSRs distributed in 14,057 unigenes were *** these, 2820, 583, and 3423 SSRs were located in the 50–UTR, coding sequence(CDS), and 30–UTR regions,respectively, while the remaining 9984 SSRs had undetermined physical locations. The largest group of repeat motifs comprised mononucleotide repeats(70.76%), followed by dinucleotide(15.59%) and trinucleotide(12.10%)repeats. AG/CT(8.69%) and AAG/CTT(4.15%) were the main dinucleotide and trinucleotide repeats, ***, 9597 SSR-specific primer pairs were designed. Among 100 primer pairs selected randomly to determine their usefulness, 53 proved to be efficient. To the our best of knowledge, this work is the first study of the E. mollis transcriptome and constitutes valuable genomics data for future genetic engineering studies to alter the amount of Ve. The identified potential EST-SSR markers can be used for population genetics studies and assistedbreeding of E. mollis.

关键词： Elaeagnaceae Elaeagnus mollis Transcriptome Vitamin E Simple sequence repeats(SSR)

Study on the Application of Aesthetic Ideas to Micro-film Advertising

在线全文

学校读者我要写书评

暂无评论

International Journal of Technology Management 2013年第5期 114-116页

作者： yunying wang Department of Art Design Henan Mechanical and Electrical Engineering College

Micro-film is a product from the development of mobile media technology based on the network media, and the short and typical screen expression ability and effect are its forms of contents. Different from the communication way of traditional advertising, micro-film advertising has the characteristics of both social networking and video communication. With the creative characteristics of micro-film advertising, the conamunication way of video advertising has been started. In this paper, through the introduction to the advantages of micro-film advertising communication and combining with the development of micro-film in the new period, the application of aesthetic ideas to micro-film advertising is further explored, and then the striking expression effect caused by micro-film advertising is introduced.

关键词： Micro-film Advertising Aesthetic Ideas Application

Discussion on the Application of Sentiment Elements to Advertising Design

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

International Journal of Technology Management 2013年第6期 113-115页

作者： yunying wang Department of Art Design Henan Mechanical and Electrical Engineering College

With the continuous increase of social and economic competitiveness, the position of advertising becomes more and more important. For attracting people＇s attention to the advertising, merchants should not only rely on novel advertising creativity and also add some sentiment elements in advertising design under the background of today＇s advertising all over the world. Sentiments are the most capable of touching human nerves so as to leave a deep impression in the minds of people, so the quality of advertising can be well improved if appropriate sentiment elements are added in advertising design. In this paper, the application of emotional elements to advertising design is specifically discussed from emotional elements classification, main application methods, and matters needing attention.

关键词： Sentiment Advertising Design Application Significance

Effect of Xenon Arc Lamp Irradiation on Properties of Polymethyl Methacrylate for Aviation

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

Open Journal of Organic Polymer Materials 2015年第1期5卷 23-29页

作者： Jiangyan Meng yunying wang Key Laboratory of Nondestructive Testing Nanchang Hangkong University Ministry of Education Nanchang China

YB-2 aviation polymethyl methacrylate (PMMA) is irradiated in a xenon arc lamp weather resistance test chamber for 1620 hours. The tensile strength, light transmittance, surface morphology, relative molecular mass, infrared absorption spectrum and glass transition temperature (Tg) of PMMA exposed in xenon arc lamp for different durations are tested and characterized by universal testing machine, optical haze instrument, scanning electronic microscopy (SEM), gel permeation chromatograph (GPC), fourier transform infrared spectrometer (FT-IR) and differential scanning calorimetry (DSC), so as to comprehensively analyze the influence of xenon arc lamp irradiation on the performance of PMMA. The results reveal that under the effect of 1620 hours xenon arc lamp irradiation and periodic spraying water, the light transmittance and glass transition temperature do not change significantly, and no new chemical group is produced. After irradiated 360 hours, tiny cracks occur in the surface of PMMA, indicating that they occur at a certain degree of degradation, meanwhile, the main chain may be broken and the relative molecular mass of surface of the material decreases. After exposure of 720 hours, the tensile strength decreases about 30%.

关键词： Aviation Perspex Xenon Arc lamp Irradiation Relative Molecular Mass Surface Morphology Gel Permeation Chromatograph