检索结果-南通市图书馆

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用户体验图书馆员新职位的研究与思考

中国图书馆学报 2022年第2期48卷 108-115页

作者：冯佳上海社会科学院文学研究所

近几年，随着信息技术的飞速发展，源于线上服务的用户体验图书馆员新职位开始出现，其核心要义是以用户为中心，深受各种定量与定性用户研究的影响。图书馆用户体验从业者往往身兼数职，并主要担任图书馆内咨询顾问的角色，工作内容主... 详细信息

近几年，随着信息技术的飞速发展，源于线上服务的用户体验图书馆员新职位开始出现，其核心要义是以用户为中心，深受各种定量与定性用户研究的影响。图书馆用户体验从业者往往身兼数职，并主要担任图书馆内咨询顾问的角色，工作内容主要集中在收集用户数据、提升交互体验、优化实体空间、测试数字平台等方面。通过会议或培训研讨班、用户体验社群、高校图情院系及其他院系的相关课程等各种学习教育形式，能够不断加强用户体验图书馆员的学习培训。用户体验图书馆员的出现，要求图书馆工作应秉持以用户为中心的理念，图书馆员应以用户诉求为出发点，顺应互联网时代用户至上、体验为王的思维模式，满足新技术、新媒体环境下的读者新需求。参考文献27。

关键词：图书馆用户体验图书馆员用户为中心

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Effect of polyglycolic acid sheet plus esophageal stent placement in preventing esophageal stricture after endoscopic submucosal dissection in patients with earlystage esophageal cancer: A randomized, controlled trial

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World Journal of Gastroenterology 2018年第9期24卷 1046-1055页

作者： Ning-Li Chai jia feng Long-Song Li Sheng-Zhen Liu Chen Du Qi Zhang En-Qiang Linghu Department of Gastroenterology Chinese PLA General Hospital

AIM To assess the effect of polyglycolic acid(PGA) plus stent placement compared with stent placement alone in the prevention of post-endoscopic submucosal dissection(ESD) esophageal stricture in early-stage esophageal cancer(EC) patients. METHODS Seventy EC patients undergoing ESD were enrolled in this randomized, controlled study. Patients were allocated randomly at a 1:1 ratio into two groups as follows:(1) PGA plus stent group(PGA sheet-coated stent placement was performed); and(2) Stent group(only stent placement was performed). This study was registered on http://***(No. chictrinr-16008709). RESULTS The occurrence rate of esophageal stricture in the PGA plus stent group was 20.5%(n = 7), which was lower than that in the stent group(46.9%, n = 15)(P = 0.024). The mean value of esophageal stricture time was 59.6 ± 16.1 d and 70.7 ± 28.6 d in the PGA plus stent group and stent group(P = 0.174), respectively. Times of balloon dilatation in the PGA plus stent group were less than those in the stent group [4(2-5) vs 6(1-14), P = 0.007]. The length(P = 0.080) and diameter(P = 0.061) of esophageal strictures were numerically decreased in the PGA plus stent group, whereas no difference in location(P = 0.232) between the two groups was found. Multivariate logistic analysis suggested that PGA plus stent placement(P = 0.026) was an independent predictive factor for a lower risk of esophageal stricture, while location in the middle third(P = 0.034) and circumferential range = 1/1(P = 0.028) could independently predict a higher risk of esophageal stricture in EC patients after ESD. CONCLUSION PGA plus stent placement is more effective in preventing post-ESD esophageal stricture compared with stent placement alone in EC patients with earlystage disease.

关键词： Esophageal cancer Endoscopic submucosal dissection Polyglycolic acid plus stent placement Esophageal stricture

Detection and Quantification of Water-Soluble Inorganic Chlorine,Bromine and Iodine by MALDI-MS

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Journal of Analysis and Testing 2022年第4期6卷 419-423页

作者： Yi Tong Zheng-Zheng Liu jia-feng Lu Hai-Yan Zhang Ke-Qiang Shi Guan-Ru Chen Ya-Qin Liu Hong-Ru feng Yuan-jiang Pan Department of Chemistry Zhejiang UniversityHangzhou310027China Zhejiang Key Laboratory of Ecological and Environmental Monitoring Forewarning and Quality ControlZhejiang Ecological and Environmental Monitoring CenterHangzhou310012China School of Environment Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou310000China

Halogens are elements in soil and water that occur as organic and inorganic *** have shown that inorganic halogens are closely related to animal and plant ***-assisted laser desorption/ionization mass spectrometry(MALDI-MS)can achieve high-throughput and rapid analysis,which is also an essential characteristic in some environmental ***,there is currently no report on MALDI-MS analysis for water-soluble inorganic halogen *** this study,we aimed to develop a reliable and reproductive method to detect inorganic halogens in soil and water by *** on sinapic acid(SA)and silver trifluoromethanesulfonate(SA/AgOTf)as the matrix in negative-ion mode,MALDI-MS showed excellent MS signals related to *** the optimum conditions,the method achieved satisfactory linearity(R^(2)>0.99)and repeatability(RSD<18%).The LODs for Cl^(−),Br^(−)and I^(−)were 0.76,0.11 and 0.10μg/mL,*** concentration of inorganic halogens from 24 samples was successfully determined by *** summary,an innovative method was developed for the analysis of inorganic halogens by MALDI-MS using a novel SA/AgOTf matrix,extending the application of MALDI-MS in inorganic compounds.

关键词： MALDI-MS Water-soluble halogen Quantification Soil Water

A directional MAC protocol with long-range communication ability in ad hoc networks

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Science China(Information Sciences) 2012年第4期55卷 765-777页

作者： REN PinYi,feng jia & WANG YiChen School of Electronics and Information Engineering,Xi’an jiaotong University,Xi’an 710049,China School of Electronics and Information Engineering Xi’an Jiaotong University Xi’an China

To address the problem that long-range communication capability in ad hoc networks using directional antenna is not generally utilized,a directional media access control (DMAC) protocol with long-range communication (LRC) capability in ad hoc networks is *** the LRC-DMAC,the intermediate node uses a long-range orientation (LRO) algorithm to help the transmitter obtain the directional information of the receiver which is two hops ***,the long-range link between such two hops nodes can be set *** to whether the received power information is available or not,we propose two types of LRO algorithm:without the received power information,a basic LRO obtains the approximate directional informa-tion of the long-range receiver by a geometric relationship;however,the LRO-PI can calculate the accurate directional information of the long-range receiver using the received *** analysis indicates that the LRO algorithm achieves high accuracy when the relevant parameters are properly *** results show that the establishment of long-range links can effectively improve the network throughput and reduce the end-to-end delay.

关键词： ad hoc networks directional antenna MAC

Phylogenetic and Morphological Investigation of a Dunaliella Strain Isolated from Yuncheng Salt Lake,China

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 106-107页

作者： WANG Feipeng feng jia WANG Jie LI Bo XIE Shulian School of Life Science Shanxi University

A Dunaliella strain was isolated from Yuncheng Salt Lake,Shanxi,China(111.05°E,35.03°N).Morphological characteristics and molecular data were used to evaluate the relationship of this algal strain to other Dunaliella

关键词： Dunaliella Morphology Phylogeny

Long-term dynamics and driving factors of phytoplankton biomass during urbanization,northern

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Journal of Oceanology and Limnology 2024年第6期42卷 1928-1942页

作者： Kangxu ZHAO Junping LÜ Fangru NAN Xudong LIU Hui LING Congjie PANG Shulian XIE jia feng School of Life Science Shanxi UniversityTaiyuan 030006China Management Committee of Taiyuan Fenhe Scenic Spot Taiyuan 030002China

Understanding the relative impact of nutrients and related environmental variables on phytoplankton biomass changes in urban rivers is important for river *** this study,we explored the long-term dynamic changes and driving factors of phytoplankton biomass in the process of urbanization from the perspective of time and space,and provided a scientific support to water ecological health assessment and management of urban *** 2012 to 2021,the phytoplankton community composition in Taiyuan section of Fenhe River was found to be dominated by Cyanophyta,Chlorophyta,and *** them,cyanobacteria were the main contributors to the total abundance,green algae ranked second,and diatoms were the *** biomass of phytoplankton in different groups showed different decreasing *** on 10 environmental factors to explain the changes of three main phytoplankton groups(cyanobacteria,green algae,diatoms),we found that chemical oxygen demand and water temperature had a high explanation rate for the abundance changes of the three main phytoplankton groups,which were important environmental factors affecting their biomass *** random forest model was used to analyze the changes in the total biomass of *** was found that the permanganate index had a higher contribution to the total biomass of phytoplankton in *** contribution of air temperature to the total biomass of phytoplankton was higher in space.

关键词： phytoplankton biomass environmental factor urbanization

风电功率跟踪的渐进随动本质与无通信的风电场集中变频原理

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中国电机工程学报 2023年第15期43卷 5877-5889页

作者：贾锋符杨上海电力大学电气工程学院上海市杨浦区200090

从变速恒频风电机组的降载提质增效控制目标入手,对3种基本MPPT控制下的功率跟踪能力、功率波动和轴系载荷进行分析,论证功率信号反馈控制与最优转矩控制的等价性,揭示二者本质上均属于内嵌风力机特性的渐进随动控制,阐明MW级机组变流... 详细信息

从变速恒频风电机组的降载提质增效控制目标入手,对3种基本MPPT控制下的功率跟踪能力、功率波动和轴系载荷进行分析,论证功率信号反馈控制与最优转矩控制的等价性,揭示二者本质上均属于内嵌风力机特性的渐进随动控制,阐明MW级机组变流控制不必要过分追求快速性的原因。分析表明渐进随动控制是MW级机组降载提质增效目标下的综合优选,机组巨大的转动惯量天然的为机组转速和有功功率引入10s以上的大时间常数低通滤波特性,是集中变频可行以及恒压频比控制满足发电机控制需求的依据。提出将功率信号反馈控制与转速开环恒压频比控制相结合构成集中变频换流站的有功–频率随动控制策略,省去换流站与风电场之间的高速通信。进一步提出一种适用于中远距离海上风电的新型风电系统方案——动态低频风电系统,具有潜在的低成本、高可靠和电网友好特性,经仿真验证可行。

关键词：风电并网最大功率跟踪集中变频随动控制恒压频比无通信低频输电

Study on luminescence characteristics of blue OLED with phosphor-doped host-guest structure

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Optoelectronics Letters 2018年第3期14卷 164-169页

作者： WANG Zhen LIU Fei ZHENG Xin CHEN Ai XIE jia-feng and ZHAN Wen-xia School of Optoelectronic Engineering Chongqing University of Posts and Telecommunications

In this study,we design and fabricate phosphor-doped host-guest structure organic light-emitting diodes(OLEDs),where the blue-ray iridium complex electrophosphorescent material FIrpic acts as object *** of the device can be accommodated by changing the host materials,dopant concentration and thickness of the light-emitting *** study shows that the host material N,N'-dicarbazolyl-3,5-benzene(mC P)has a higher triplet excited state energy level,which can effectively prevent FIrpic triplet excited state energy backtracking to host material,thus the luminous efficiency is *** mC P is selected as the host material,the thickness of the light-emitting layer is30 nm and the dopant concentration is 8 wt%,the excitons can be effectively confined in the light-emitting *** a result,the maximum current efficiency and the maximum brightness of the blue device can reach 15.5 cd/A and7 196.3 cd/m^2,respectively.

关键词： luminescence characteristics phosphor-doped host-guest structure

Public libraries in the modern public cultural service system

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Journal of Library Science in China 2015年 234-235页

作者： Zhinan WU jia feng 不详

After more than a hundred years’development,public libraries have entered a rising period marked by government participation and public service-orientation in recent *** this context and from the perspective of modern public culture service system,the overall public librarianship has some problems to be solved,such as facility layout with rigidified administration which is difficult

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