共查询到20条相似文献，搜索用时 250 毫秒
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以羟丙基纤维素、壳聚糖、羧甲基纤维素、明胶-甘油溶液4种化学加固材料为研究对象,选用纸质档案中常见的蓝黑墨水、红色墨水、纯蓝墨水、碳素墨水、墨汁、铅笔和印泥等字迹材料,从加固前后字迹的耐水、耐化学药剂、耐氧化、耐摩擦等方面,评价4种化学加固材料的加固效果。该研究对于纸质档案字迹保护材料的选取具有一定的现实指导意义。 相似文献
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基于传热学和材料学原理,进行了改性沥青中掺入高折光指数的纳米填料TiO2、SiO2的热反射试验,以提高沥青混凝土的反射率,降低吸收率及路面温度。按改性沥青：2%、4%、6%线型/星型SBS＋基质沥青,2%、4%、6%TiO2/SiO2＋基质沥青,6%线型SBS＋2%,4%,6%TiO2＋基质沥青的配比制作试样,利用实验室简易法测定各种类型沥青的热反射效果。试验结果表明,线型/星型SBS对沥青热反射的影响不大,折光指数高的纳米材料TiO2及SiO2能明显地提高改性沥青的反射率;与基质沥青相比,掺加6%线型SBS和6%TiO2的改性沥青表面温度减低超过5,可以有效地提高沥青的反射率,从而降低了路面温度及带来的温度应力破坏,有一定的应用前景。 相似文献
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本刊讯近日,湖北日报报业集团与马天尼(香港)有限公司在汉正式签署合同,购进一条精工A7型全自动数字化无线胶订联动线。马天尼公司是国际上印后胶订设备的专业生产厂家,精工A7型无线胶订线是目前世界上调校速度最快的胶订机,设计速度为每小时7000册,国内印刷行业中目前有5台。 相似文献
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《桌面出版与设计》1998,(3)
OzasolN90AOzasolN90A是一种阴图感光树脂版,适用于电脑直接制版．它有感光性树脂涂层,具有耐印率高、印刷宽容度佳等特点。特性印刷稳定性高、宽色调范围,可用于调频网优质的印刷宽容度处理流程简单（预热、显影、冲洗、上胶）,并可配合VSO85自动化冲版机使用应用中加州a杖．1”IJ·从州印事,一件上二S认Om）印造川J叫“I印wM。－Y,村丁。J－k认UV油出fjl【B汕出山厂、。W呷1版特性,使感光速理川1快Ellll＆BW加M线数1。J达200线／英、I－X会将种尺｝最大印版宽度。J达1壮0毫米接近常规制版性能冲洗方面收光特性件5H纳… 相似文献
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本文以中性纸为载体,选用四种常见的档案字迹材料——墨汁、碳素墨水、中性笔油墨和打印油墨为研究对象,分别对承载有各字迹材料的试样进行蒸馏水、过氧化氢-乙醚,过氧化氢-乙醚+草酸/乙醇+氢氧化钡/甲醇去污加固联合处理,从试样的耐干热老化、耐紫外老化、耐酸碱性、耐氧化性等方面进行系统的测试、分析和比较,进而探讨过氧化氢-乙醚去污法对档案字迹耐久性的影响.实验结果表明:过氧化氢-乙醚去污法对档案字迹影响较大;氧化去污与加固保护的结合更有利于提高档案字迹的耐久性. 相似文献
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激光打印字迹材料是档案文件的重要组成部分,但是激光打印字迹容易受温度、湿度和光照等外界环境因素的影响.针对如何实现激光打印字迹的长期保存问题,开展了老化性能试验,在分析研究激光打印字迹的耐干热、耐紫外光照、耐水浸、耐酸和耐碱的性能的基础上,提出合理和可行建议. 相似文献
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学术文本词汇功能识别--基于标题生成策略和注意力机制的问题方法抽取 总被引：1，自引：0，他引：1
学术文本词汇功能识别的目的是实现学术文本中表征问题、方法和对象等词汇的抽取。针对传统识别方法中训练难以获取所导致的识别准确率低、召回率有限和泛化能力差等问题,本研究提出了一种基于深度学习和标题生成策略的学术文本词汇功能识别方法,将任务形式由信息抽取转化为特定形式的标题生成问题。本研究采用构建seq2seq模型和引入注意力机制的方式捕获词汇多层语义信息,最终实现学术文本中问题和方法指代词的生成和获取。实验结果表明,通过应用深度学习方法和标题生成策略,本研究提出的模型能够从摘要中有效识别学术文献的主要研究问题和主要研究方法,并较已有方法在识别效果上有明显提升。 相似文献
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Julie G. Kosteniuk Debra G. Morgan Carl K. D'Arcy 《Journal of the Medical Library Association》2013,101(1):32-37
Objectives:
The research determined (1) the information sources that family physicians (FPs) most commonly use to update their general medical knowledge and to make specific clinical decisions, and (2) the information sources FPs found to be most physically accessible, intellectually accessible (easy to understand), reliable (trustworthy), and relevant to their needs.Methods:
A cross-sectional postal survey of 792 FPs and locum tenens, in full-time or part-time medical practice, currently practicing or on leave of absence in the Canadian province of Saskatchewan was conducted during the period of January to April 2008.Results:
Of 666 eligible physicians, 331 completed and returned surveys, resulting in a response rate of 49.7% (331/666). Medical textbooks and colleagues in the main patient care setting were the top 2 sources for the purpose of making specific clinical decisions. Medical textbooks were most frequently considered by FPs to be reliable (trustworthy), and colleagues in the main patient care setting were most physically accessible (easy to access).Conclusions:
When making specific clinical decisions, FPs were most likely to use information from sources that they considered to be reliable and generally physically accessible, suggesting that FPs can best be supported by facilitating easy and convenient access to high-quality information.Highlights
- Medical textbooks were the most popular information source for family physicians'' (FPs'') clinical decision-making purposes, and medical journals were the most popular information source for the purpose of updating FPs'' general medical knowledge.
- FPs considered medical textbooks to be the most reliable (trustworthy) source, colleagues the most physically accessible, and continuing medical education the most relevant and intellectually accessible.
- The lowest ranked information sources across all four attributes were personal digital assistants, mental health professionals, pharmaceutical sales representatives, and other decision aids.
Implications
- The most popular information sources for clinical decision-making purposes among FPs were sources characterized as reliable and generally physically accessible.
- This study suggests the need for further research into interventions that target information access barriers in FPs'' practice settings and the promotion of reliable evidence for FPs'' clinical decision-making purposes.
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Kristine M. Alpi James C. Brown Jr. Jennifer A. Neel Carol B. Grindem Keith E. Linder James B. Harper 《Journal of the Medical Library Association》2016,104(1):15-23
Objective
Clinical and research usefulness of articles can depend on image quality. This study addressed whether scans of figures in black and white (B&W), grayscale, or color, or portable document format (PDF) to tagged image file format (TIFF) conversions as provided by interlibrary loan or document delivery were viewed as acceptable or useful by radiologists or pathologists.Methods
Residency coordinators selected eighteen figures from studies from radiology, clinical pathology, and anatomic pathology journals. With original PDF controls, each figure was prepared in three or four experimental conditions: PDF conversion to TIFF, and scans from print in B&W, grayscale, and color. Twelve independent observers indicated whether they could identify the features and whether the image quality was acceptable. They also ranked all the experimental conditions of each figure in terms of usefulness.Results
Of 982 assessments of 87 anatomic pathology, 83 clinical pathology, and 77 radiology images, 471 (48%) were unidentifiable. Unidentifiability of originals (4%) and conversions (10%) was low. For scans, unidentifiability ranged from 53% for color, to 74% for grayscale, to 97% for B&W. Of 987 responses about acceptability (n=405), 41% were said to be unacceptable, 97% of B&W, 66% of grayscale, 41% of color, and 1% of conversions. Hypothesized order (original, conversion, color, grayscale, B&W) matched 67% of rankings (n=215).Conclusions
PDF to TIFF conversion provided acceptable content. Color images are rarely useful in grayscale (12%) or B&W (less than 1%). Acceptability of grayscale scans of noncolor originals was 52%. Digital originals are needed for most images. Print images in color or grayscale should be scanned using those modalities. 相似文献13.
Gary D. Byrd Patricia J. Devine Kate E. Corcoran 《Journal of the Medical Library Association》2014,102(4):257-270
Objective:
The Medical Library Association (MLA) Board of Directors and president charged an Ethical Awareness Task Force and recommended a survey to determine MLA members'' awareness of and opinions about the current Code of Ethics for Health Sciences Librarianship.Methods:
The task force and MLA staff crafted a survey to determine: (1) awareness of the MLA code and its provisions, (2) use of the MLA code to resolve professional ethical issues, (3) consultation of other ethical codes or guides, (4) views regarding the relative importance of the eleven MLA code statements, (5) challenges experienced in following any MLA code provisions, and (6) ethical problems not clearly addressed by the code.Results:
Over 500 members responded (similar to previous MLA surveys), and while most were aware of the code, over 30% could not remember when they had last read or thought about it, and nearly half had also referred to other codes or guidelines. The large majority thought that: (1) all code statements were equally important, (2) none were particularly difficult or challenging to follow, and (3) the code covered every ethical challenge encountered in their professional work.Implications:
Comments provided by respondents who disagreed with the majority views suggest that the MLA code could usefully include a supplementary guide with practical advice on how to reason through a number of ethically challenging situations that are typically encountered by health sciences librarians. 相似文献14.
Maria A. Blanco Carol F. Capello Josephine L. Dorsch Gerald Perry Mary L. Zanetti 《Journal of the Medical Library Association》2014,102(3):160-168
Purpose:
The authors conducted a survey examining (1) the current state of evidence-based medicine (EBM) curricula in US and Canadian medical schools and corresponding learning objectives, (2) medical educators'' and librarians'' participation in EBM training, and (3) barriers to EBM training.Methods:
A survey instrument with thirty-four closed and open-ended questions was sent to curricular deans at US and Canadian medical schools. The survey sought information on enrollment and class size; EBM learning objectives, curricular activities, and assessment approaches by year of training; EBM faculty; EBM tools; barriers to implementing EBM curricula and possible ways to overcome them; and innovative approaches to EBM education. Both qualitative and quantitative methods were used for data analysis. Measurable learning objectives were categorized using Bloom''s taxonomy.Results:
One hundred fifteen medical schools (77.2%) responded. Over half (53%) of the 900 reported learning objectives were measurable. Knowledge application was the predominant category from Bloom''s categories. Most schools integrated EBM into other curricular activities; activities and formal assessment decreased significantly with advanced training. EBM faculty consisted primarily of clinicians, followed by basic scientists and librarians. Various EBM tools were used, with PubMed and the Cochrane database most frequently cited. Lack of time in curricula was rated the most significant barrier. National agreement on required EBM competencies was an extremely helpful factor. Few schools shared innovative approaches.Conclusions:
Schools need help in overcoming barriers related to EBM curriculum development, implementation, and assessment.Implications:
Findings can provide a starting point for discussion to develop a standardized competency framework. 相似文献15.
David B. Resnik Elizabeth Wager Grace E. Kissling 《Journal of the Medical Library Association》2015,103(3):136-139
Objective
This study gathered information about the retraction policies of the top 200 scientific journals, ranked by impact factor.Methods
Editors of the top 200 science journals for the year 2012 were contacted by email.Results
One hundred forty-seven journals (74%) responded to a request for information. Of these, 95 (65%) had a retraction policy. Of journals with a retraction policy, 94% had a policy that allows the editors to retract articles without authors’ consent.Conclusions
The majority of journals in this sample had a retraction policy, and almost all of them would retract an article without the authors’ permission. 相似文献16.
Dennis W. Fell Judy F. Burnham Jon M. Dockery 《Health information and libraries journal》2013,30(1):35-48
Objective
To determine the information sources utilised by physical therapists (PTs) to support clinical decisions.Methods
Physical therapists in the United States were invited via professional listservs and electronic newsletters to participate in an online survey.Results
Journal articles were the most frequently utilised source of information, followed by databases (PubMed was most frequent). The frequency of utilising evidence‐based resources was not significantly affected by the number of years of experience as a physical therapist (PT), working in a state that allows direct access to PT services or doctoral vs masters/bachelors degree.Conclusions
Compared with a previous study (1994), there has been a transition in physical therapy information seeking, with greater reliance on evidence‐based information. 相似文献17.
Heidi J. Mortensen Jeffrey L. Alexander Guy M. Nehrenz Cynthia Porter 《Health information and libraries journal》2013,30(1):23-34
Objectives
The aims of this study were to: 1) establish whether infection control professionals (ICPs) who had access to and utilised medical librarian services for evidence‐based medicine (EBM) research perceived this assistance to be useful and 2) to establish whether ICPs who used electronic or hard copy resources for EBM research perceived that those resources had a significant impact on their work.Methods
Convenience sampling was used to collect quantitative data via a questionnaire. Study participants were members of South‐west and Western chapters of the Association for Professionals in Infection Control and Epidemiology. There were 264 questionnaires distributed in this study; 179 participants completed the questionnaire. The response rate for eligible respondents was 59.5% (157).Results
Results indicated 56.7% (51) of the ICPs with librarian access reported requesting assistance from their work facility librarian. In reference to locating infection control information, 77.9% (95), 87.3% (124) and 93.3% (138) of ICPs found textbooks, journals and the Internet ‘very useful’ or ‘useful’, respectively.Conclusion
Study results indicated ICPs who used the assistance of medical librarians and/or hard copy or electronic resources for EBM research perceived such sources to be valuable for obtaining infection control information. 相似文献18.
Laura Koppen Jennifer Phillips Renee Papageorgiou 《Journal of the Medical Library Association》2015,103(3):140-144
Objective
References from drug-related Wikipedia articles and a drug information database were compared.Methods
Drugs in Food and Drug Administration (FDA) MedWatch alerts from January–July 2013 were searched in Wikipedia and Lexicomp to compare reference types and to assess the time for drug safety information to be incorporated into Wikipedia articles.Results
Wikipedia most commonly cited peer-reviewed journal articles (49.2%) and news articles (12.0%). MedWatch citations were incorporated into Wikipedia on average in 5.9 days.Conclusions
Wikipedia cited various sources but may not be a reliable, up-to-date resource for drug safety information. 相似文献19.
Question/Purpose
The New York University (NYU) Health Sciences Library used a new method to arrange in-depth discussions with basic science researchers. The objective was to identify collaborators for a new National Library of Medicine administrative supplement.Setting
The research took place at the NYU Health Sciences Library.Methods
Using the National Institutes of Health (NIH) RePORTER, forty-four researchers were identified and later contacted through individualized emails.Results
Nine researchers responded to the email followed by six in-person or phone discussions. At the conclusion of this process, two researchers submitted applications for supplemental funding, and both of these applications were successful.Conclusions
This method confirmed these users could benefit from the skills and knowledge of health sciences librarians, but they are largely unaware of this. 相似文献20.
Md. Abul Kalam Siddike Md. Shiful Islam 《International Information and Library Review》2011,43(3):130-136