检索结果-南通市图书馆

Bulk flow properties of fly ashes at ambient and high temperature

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2018年第3期16卷 113-125页

作者： Yi Liu Haifeng Lu diego Barletta Massimo Poletto Xiaolei Guo Xin Gong YongJin Key Laboratory of Coal Gasification and Energy Chemical Engineering of the Ministry of Education Shanghai Engineering Research Center of Coal Gasification Institute of Clean Coal Technology East China University of Science and Technology Shanghai 200237 China Dipartimento di lngegneria lndustriale Universita degli Studi di Salerno Via Giovanni Paolo II 1321-84084 Fisciano SA Italy

The bulk flow properties of four different fly ashes were assessed at ambient temperature and at 500 ~C, using a high temperature annular shear cell. These powders all resulted from industrial processes and had similar chemical compositions but different particle size distributions. Applying a high temperature was found to increase the powder cohesion, with this effect being more significant in the case of the sample with the highest proportion of fines. To better understand the effect of temperature on the bulk flow properties of these materials, a model previously proposed by some of the authors was used to correlate the powder isostatic tensile strength with the interparticle forces and microscale particle contact struc- ture. This model combines the continuum approach with description of particle-to-particle interactions. A comparison with experimental data indicated that the effects of consolidation and temperature on the tensile strength of the fly ashes were correctly described by the model. This theoretical approach also elucidates the mechanism by which the temperature affects the bulk flow properties of fly ashes through modifications of the microscale intemarticle contacts.

关键词： Fly ash High temperature annular-shear cell Flow model Isostatic tensile strength Interparticle force

Applied RCM^2 Algorithms Based on Statistical Methods

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 Automation and computing 2007年第2期4卷 109-116页

作者： Fausto Pedro García Márquez diego J. Pedregal ETSI Industriales Universidad de Castilla-La ManchaCampus Universitario s/n 13071 Ciudad RealSpain

The main purpose of this paper is to implement a system capable of detecting faults in railway point mechanisms. This is achieved by developing an algorithm that takes advantage of three empirical criteria simultaneously capable of detecting faults from records of measurements of force against time. The system is dynamic in several respects： the base reference data is computed using all the curves free from faults as they are encountered in the experimental data; the algorithm that uses the three criteria simultaneously may be applied in on-line situations as each new data point becomes available; and recursive algorithms are applied to filter noise from the raw data in an automatic way. Encouraging results are found in practice when the system is applied to a number of experiments carried out by an industrial sponsor.

关键词： Maintenance railways state space models system reliability monitoring elements.

Selective logging alters allometric relationships of five tropical tree species in seasonal semi-deciduous forests

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2019年第5期30卷 1633-1639页

作者： diego Resende Rodrigues Yves Rafael Bovolenta José Antonio Pimenta Edmilson Bianchini Departamento de Biologia Animal e Vegetal Centro de Ciências Biológicas Universidade Estadual de Londrina

In selectively logged forests,trees are more likely to expand their diameters(D)at the expense of height(H)growth,resulting in variations in H:D *** study examines how selective logging affects the H:D allometric relationships of five common tree species and whether the effects vary with functional groups(shade-intolerant or shade tolerant)in seasonal semi-deciduous *** of five species in a 3000 m^2(0.3 ha)plot were marked and heights and diameters *** of the species,with one exception,showed greater investment in diameter per increment of height compared to an unlogged forest,possibly because of the greater light *** study shows the effects of selective logging on species populations as evidenced by increases in H:D *** of forest fragments with different degrees of human impact is important because it allows us to understand the differences in architectural characteristics caused by selective logging.

关键词： Allometry Anthropic exploitation Ecological groups Luminosity Selective logging

Energy Sustainability: A Cross-country Empirical Investigation

在线全文

学校读者我要写书评

暂无评论

Energy Sustainability: A Cross-country Empirical Investigati...

作者： diego DE PIAZZA 复旦大学

学位级别：硕士

自从18世纪后■的工业革命以来,现代人类■会对能源,尤其是依赖燃烧化石燃料的能源需求成指数增长。人类对有限能源的不负责任的过度开发利用引发了最近三十年来国际社会日渐提升对化石燃料耗尽、以及对产生的严重环境后果的意识。因此... 详细信息

自从18世纪后■的工业革命以来,现代人类■会对能源,尤其是依赖燃烧化石燃料的能源需求成指数增长。人类对有限能源的不负责任的过度开发利用引发了最近三十年来国际社会日渐提升对化石燃料耗尽、以及对产生的严重环境后果的意识。因此,在全球范围内,人们把目光集中到了利用科学技术和其他能源来减少、直至逐渐替代我们对化石燃料的依赖,从而避■不可挽回的后果。这一切激发了人们对新能源,例如核能和其他可再生能源的研究和发展。在此大环境下,理解和在人类■会中合理应用可再生能源变得空前重要。这篇研究论文旨在描述和分析88个国家能源组成的可持续性（基于2009年数据）,并预测2030年可能发生的各个国家能源可持续性变化。为了便于分析,我设计了“能源可持续性指数”。该指数包含三个主要能源类别：化石燃料、核能源、以及可再生能源。就化石燃料而言,我考虑到了三类限制：其独立性、生命周期、和环境限制。关于核能,我在之前三类限制基础上加上了效率这一因素。最后,我对可再生能源加上了环境、效率、和产量这三类限制。大体上看,以2009年数据为依据,能源利用最具可持续性的是最不发达国家,其次是发展中国家,最不具可持续性的是发达国家。对2030年的预测显示,届时全球最具可持续性的仍将是不发达国家,然而发展中国家和发达国家的位置将互换。这一变化的主要原因是：现在的发达国家正逐渐将能源组成结构重心转移向核能和可再生能源。通过深度研究分析我获得以下三点发现：（1）低能源消耗有助干提升国家可持续性;（2）可再生能源的利用能显著提高国家的可持续性;（3）拥有大量化石燃料储备的国家尽管短期内更具可持续性,但是这一状态不能持久除此以外,这篇论文详细探究了能源可持续性以及在七个国家/地区能源可持续性的发展变化。这七个国家/地区的能源消耗很大程度上影响着全球能源可持续性,它们分别是：日本、美国、欧盟、巴西、中国、印度和俄罗斯。最后,为了让能源可持续性指数”能够更加完整、并对不同国家的特点（例如：富裕程度、人口、生活质量、和教育）更具针对性,我运用了人均国内生产总值（GDP per capita）和人类发展指数（HDI）这两个国际上广泛认可的指数,建立了两个调整后指数。由于这篇论文向人们提供了一个：能够评估测算任何国家能源组成结构的改变对其可持续性的影响的工具,论文将为国际社会提供一个全新的国家可持续性测算方法,并且将帮助政策制定者有效调整和改进他们的长期国家能源政策。

关键词：可持续性能源指数

Can Automatic Classification Help to Increase Accuracy in Data Collection?

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Journal of Data and Information Science 2016年第3期1卷 42-58页

作者： Frederique Lang diego Chavarro Yuxian Liu Science Policy Research Unit (SPRU) School of Business Management and Economics University of Sussex Tongji University Library Tongji University

Purpose： The authors aim at testing the performance of a set of machine learning algorithms that could improve the process of data cleaning when building datasets. Design/methodology/approach： The paper is centered on cleaning datasets gathered from publishers and online resources by the use of specific keywords. In this case, we analyzed data from the Web of Science. The accuracy of various forms of automatic classification was tested here in comparison with manual coding in order to determine their usefulness for data collection and cleaning. We assessed the performance of seven supervised classification algorithms （Support Vector Machine （SVM）, Scaled Linear Discriminant Analysis, Lasso and elastic-net regularized generalized linear models, Maximum Entropy, Regression Tree, Boosting, and Random Forest） and analyzed two properties： accuracy and recall. We assessed not only each algorithm individually, but also their combinations through a voting scheme. We also tested the performance of these algorithms with different sizes of training data. When assessing the performance of different combinations, we used an indicator of coverage to account for the agreement and disagreement on classification between algorithms. Findings： We found that the performance of the algorithms used vary with the size of the sample for training. However, for the classification exercise in this paper the best performing algorithms were SVM and Boosting. The combination of these two algorithms achieved a high agreement on coverage and was highly accurate. This combination performs well with a small training dataset （10%）, which may reduce the manual work needed for classification tasks. Research limitations： The dataset gathered has significantly more records related to the topic of interest compared to unrelated topics. This may affect the performance of some algorithms, especially in their identification of unrelated papers. Practical implications： Although the classification achieved by

关键词： Disambiguation Machine leaming Data cleaning Classification Accuracy Recall Coverage

Laser-induced plasma formation in water with up to 400 mJ double-pulse LIBS

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2024年第1期26卷 93-100页

作者： Marion HENKEL Michelle SIEMENS Ralf METHLING Benjamin EMDE Jörg HERMSDORF Steffen FRANKE diego GONZALEZ Leibniz Institute for Plasma Science and Technology(INP) Felix-Hausdorff-Straße 2Greifswald 17489Germany Laser Zentrum Hannover e.V.(LZH) Hollerithallee 8Hannover 30419Germany

Double-pulse LIBS is a promising technique for deep-sea *** measurements in shallow water with up to 400 mJ each pulse were done to select laser parameters which promote optimized spectral line emission from plasma even at elevated pressures,where line broadening until loss of most of the spectral information can *** emission spectroscopy,using a Czerny-Turner spectrometer,has been applied to investigate the dependence of the emitted radiation on laser parameters and hydrostatic *** has been found,that higher laser pulse energies,especially with short pulse delay as required in high water pressure,can also have an adverse effect on the measured spectrum.

关键词： double-pulse LIBS underwater plasma formation emission spectrosocpy

Protective behaviors regarding coastal flooding risk in a context of climate change

在线全文

学校读者我要写书评

暂无评论

Advances in Climate Change Research 2020年第4期11卷 310-316页

作者： Colin LEMEE Oscar NAVARRO diego RESTREPO-OCHOA Denis MERCIER Ghozlane FLEURY-BAHI University of Brest Brest29200France Laboratoire de Psychologie des Pays de La Loire University of NantesNantes44312France CES University Medellin050022Colombia Laboratoire de Geographie Physique(UMR 8591-CNRS) Sorbonne UniversiteParis75000France

The physical vulnerability of coastal areas due to rising sea level and the flooding risk consequent,does not guarantee the implementation of protective behaviors by these risk zones’*** study aims to establish the link between the willingness to carry out protective behaviors and physical and perceived indicators of vulnerability.A typology of coastal flooding vulnerability,uses various physical indicators and their perceived counterparts which have been collected from 490 inhabitants of Cartagena(Colombia,declared world heritage of humanity by UNESCO in 1984),resident in areas of coastal flooding *** item-response theory(IRT)approach has been *** results reveal that the implementation of protective behaviors is more related to perceived indicators,such as distance to the sea,than to actual physical *** observe that physical vulnerability is linked to the intention to carry out protective *** presence of a defensive structure against coastal flooding could be considered as a visual cue and be a good predictor of the willingness to carry out protective *** the contrary,people in the most vulnerable situation(single-storey house)do not demonstrate a higher level of willingness to carry out protective behavior,as well of participants who lived in residential buildings which have demonstrated lower level of willingness to carry out such ***,vulnerability of the house is not seen as a criterion that encourages participants to better protect themselves.

关键词： Coastal flooding risk Protective behaviors Climate change Vulnerability Item response theory

Large-Scale Group Decision Making:A Systematic Review and a Critical Analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2022年第6期9卷 949-966页

作者： diego García-Zamora Alvaro Labella Weiping Ding Rosa M.Rodríguez Luis Martínez Department of Computer Science University of JaénJaén 23071Spain IEEE School of Information Science and Technology Nantong UniversityNantong 226019China

The society in the digital transformation era demands new decision schemes such as e-democracy or based on social *** novel decision schemes require the participation of many experts/decision makers/stakeholders in the decision *** a result,large-scale group decision making(LSGDM)has attracted the attention of many researchers in the last decade and many studies have been conducted in order to face the challenges associated with the ***,this paper aims at reviewing the most relevant studies about LSGDM,identifying the most profitable research trends and analyzing them from a critical point of *** do so,the Web of Science database has been consulted by using different *** these results a total of 241 contributions were found and a selection process regarding language,type of contribution and actual relation with the studied topic was then carried *** 87 contributions finally selected for this review have been analyzed from four points of view that have been highly remarked in the topic,such as the preference structure in which decision-makers’opinions are modeled,the group decision rules used to define the decision making process,the techniques applied to verify the quality of these models and their applications to real world problems ***,a critical analysis of the main limitations of the existing proposals is ***,taking into account these limitations,new research lines for LSGDM are proposed and the main challenges are stressed out.

关键词： Challenges large-scale consensus models large-scale group decision making(LSGDM) systematic review

Chinese Multinationals and Entry Mode Choice： Institutional, Transaction and Firm-Specific Factors

在线全文

学校读者我要写书评

暂无评论

Frontiers of Business Research in China 2012年第1期6卷 1-24页

作者： diego Quer Enrique Claver Laura Rienda Department of Management University of Alicante Alicante 03690 Sant Spain

Foreign direct investment （FDI） ownership decision is one of the most researched topics in the international business literature. However, little is known about the extent to which this knowledge can be applied to emerging-economy multinationals. Building on the institutional, transaction cost and resource-based view perspectives, this paper analyzes the determining factors of FD! mode choice between wholly-owned subsidiary （WOS） and joint venture （JV） by Chinese firms. Based on a sample of 139 outward FDI decisions made by large Chinese firms between 2002 and 2009, our results show certain characteristics that differ from the conventional wisdom of the multinational enterprise （MNE）. A host country＇s political risk and cultural distance do not affect FDI ownership decisions of Chinese MNEs, while firm size is negatively related with WOS. However, from a more conventional point of view, technological intensity of the industry is positively associated with WOS.

关键词： FDI ownership decision Chinese firms determining factors