春季桃花水的处理实践与认识     

李宝群杨宝福  程贵国 《鸡西大学学报》2004,4(2):70-72

根据水厂处理桃花水的难题，经过试验研究、分析原因，找出了解决桃花水的处理方法。  相似文献   

加工贸易下中国双边贸易出口碳排放核算及实证研究     

高静  刘国光 《软科学》2016,(6):53-56

利用世界投入产出表,采取进口国投入产出技术系数和碳排放系数测算了在加工贸易背景下中国对主要贸易国的出口碳排放总量和单位碳排放强度,比较了现有的几种测算方法下中国出口碳排放的差异,分析了加工贸易下影响中国出口碳排放的原因。中国的绿色全要素生产率持续走低,中国高投入低产出的生产状态导致中国的绿色全要素生产率(gtfp1)越低、中间投入占比(interput1)越高,中国的出口碳排放和单位碳排放强度越低。加工贸易进口令中间品生产污染转移至国外,降低了中国的出口碳排放总量和单位强度,验证了中国的"污染天堂"理论并不存在。  相似文献   

辐照板鸭产生异味的初步研究   总被引：1，自引：0，他引：1  

李宗菊  陈宗道 《科技通报》1992,8(5):300-303

采用辐射贮存肉类,剂量较高时会产生辐射异味.研究表明:板鸭辐射味随剂量的增加而加强,当剂量超过5kGy时,即引起较强的辐射味.辐射味主要来源于板鸭肌肉蛋白,特别是其中的水溶性蛋白质部分;辐射味与羰基化合物、挥发性含硫化合物及胺等有关,其含量随剂量的加大而增加.辐射产生了两种新羰基化合物(R_f值分别为0.23和0.28)及一种挥发性胺——丙胺.  相似文献   

基于网络众包模式的海量历史文献数字化处理方法研究     

席运江  林瑶瑶  廖晓  俞宽 《现代情报》2019,39(2):161

[目的/意义]针对海量历史文献数字化所面临的文献数量庞大、耗时长、成本过高等问题，本文将众包理念引入传统文献数字化工作中，形成基于网络众包模式的海量历史文献数字化处理方法。[方法/过程]该模式根据历史文献特点，将网络大众自发知识生产模式与专家定向模式相结合，提出了相应的用户激励和质量控制方案，从而保证众包任务的高效率、低成本、质量可控。此外，以粤海关清末历史文献为试点验证众包模式在大规模文献数字化处理工作中的可行性、高效性。[结果/结论]该模式为处理历史文献处理提供了新的思路与方法，且具有广阔的应用前景。  相似文献   

基于XML的信息组织与处理：2．应用技术   总被引：2，自引：0，他引：2  

张晓林 《情报科学》2001,19(9):964-971,983

本文介绍基于XML的基础数据与应用文献标记、地数据及知识体系标记、基于XML的应用领域信息处理与交换框架建设，并分析XML在图书情报领域中的应用以及XML对图书情报领域的挑战。  相似文献   

Analyzing imbalance among homogeneous index servers in a web search system     

C.S. Badue  R. Baeza-Yates  B. Ribeiro-Neto  A. Ziviani  N. Ziviani 《Information processing & management》2007

The performance of parallel query processing in a cluster of index servers is crucial for modern web search systems. In such a scenario, the response time basically depends on the execution time of the slowest server to generate a partial ranked answer. Previous approaches investigate performance issues in this context using simulation, analytical modeling, experimentation, or a combination of them. Nevertheless, these approaches simply assume balanced execution times among homogeneous servers (by uniformly distributing the document collection among them, for instance)—a scenario that we did not observe in our experimentation. On the contrary, we found that even with a balanced distribution of the document collection among index servers, correlations between the frequency of a term in the query log and the size of its corresponding inverted list lead to imbalances in query execution times at these same servers, because these correlations affect disk caching behavior. Further, the relative sizes of the main memory at each server (with regard to disk space usage) and the number of servers participating in the parallel query processing also affect imbalance of local query execution times. These are relevant findings that have not been reported before and that, we understand, are of interest to the research community.  相似文献   

Using lexical chains for keyword extraction   总被引：9，自引：0，他引：9  

Gonenc Ercan  Ilyas Cicekli   《Information processing & management》2007,43(6):1705

Keywords can be considered as condensed versions of documents and short forms of their summaries. In this paper, the problem of automatic extraction of keywords from documents is treated as a supervised learning task. A lexical chain holds a set of semantically related words of a text and it can be said that a lexical chain represents the semantic content of a portion of the text. Although lexical chains have been extensively used in text summarization, their usage for keyword extraction problem has not been fully investigated. In this paper, a keyword extraction technique that uses lexical chains is described, and encouraging results are obtained.  相似文献   

掠夺性科技期刊与科技期刊中掠夺性现象的特征研究   总被引：1，自引：0，他引：1  

张俊 《编辑学报》2020,32(4):376-379

近年来,由于开放存取(OA)出版模式的兴起,掠夺性科技期刊的出现也引起国内外学者的关注。国内科技期刊中也存在着类似的管理和学术信誉差、商业利益至上的现象,并对正常的科研成果和出版资源形成了干扰和掠夺。本文将这些存在于国内外科技期刊中的掠夺现象一并回顾和总结,认为一方面国内科技期刊从业者,应重视和适应新兴OA期刊的发展趋势,另一方面相关科研管理部门也应逐步建立措施,完善掠夺性期刊预警制度。  相似文献   

Extending WHIRL with background knowledge for improved text classification     

Sarah Zelikovitz  William W. Cohen  Haym Hirsh 《Information Retrieval》2007,10(1):35-67

Intelligent use of the many diverse forms of data available on the Internet requires new tools for managing and manipulating heterogeneous forms of information. This paper uses WHIRL, an extension of relational databases that can manipulate textual data using statistical similarity measures developed by the information retrieval community. We show that although WHIRL is designed for more general similarity-based reasoning tasks, it is competitive with mature systems designed explicitly for inductive classification. In particular, WHIRL is well suited for combining different sources of knowledge in the classification process. We show on a diverse set of tasks that the use of appropriate sets of unlabeled background knowledge often decreases error rates, particularly if the number of examples or the size of the strings in the training set is small. This is especially useful when labeling text is a labor-intensive job and when there is a large amount of information available about a particular problem on the World Wide Web.

Haym HirshEmail:

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两个加工时间恶化的半线性平行机排序问题的启发式MBLS 算法     

程明宝  孙世杰 《上海大学学报(英文版)》2007,11(5):451-456

The combination of online or semi-online with deterioration jobs has never been researched in scheduling problems. In this paper, two semi-online parallel machine scheduling problems with linear deterioration processing time are considered. In the first problem, it is assumed that the deterioration rates of jobs are known in an interval, that is, bj ∈[0, α], where 0 〈α≤ 1 and bj denotes the linear deterioration rate. In the second problem, it is assumed that the largest deterioration rate of jobs is known in advance, that is, b = max1≤j≤n {bj }. For each of the two problems, a heuristic MBLS algorithm is worked out and its worst-case ratio is analyzed. At the same time, the worst-case ratio of the list （LS） algorithm is investigated and it is proved that all the ratios are tight.  相似文献