全文获取类型
收费全文 | 88篇 |
免费 | 6篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 12篇 |
机械仪表 | 1篇 |
建筑科学 | 2篇 |
能源动力 | 4篇 |
轻工业 | 11篇 |
石油天然气 | 1篇 |
无线电 | 5篇 |
一般工业技术 | 20篇 |
冶金工业 | 3篇 |
自动化技术 | 33篇 |
出版年
2021年 | 4篇 |
2020年 | 4篇 |
2019年 | 3篇 |
2018年 | 4篇 |
2017年 | 3篇 |
2016年 | 6篇 |
2015年 | 3篇 |
2014年 | 4篇 |
2013年 | 6篇 |
2012年 | 3篇 |
2011年 | 7篇 |
2010年 | 8篇 |
2009年 | 3篇 |
2008年 | 7篇 |
2007年 | 4篇 |
2006年 | 3篇 |
2005年 | 3篇 |
2004年 | 4篇 |
2003年 | 2篇 |
2002年 | 2篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1996年 | 3篇 |
1995年 | 1篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1974年 | 1篇 |
排序方式: 共有94条查询结果,搜索用时 15 毫秒
1.
Traceability is the ability to follow a product along its lifecycle. It ensures product safety and quality along the supply chain, managing information generated by several players. Even though regulations establish the information that has to be traced, each player generates much more product (and process) information, which could be used to add value to products, with respect to, not only traceability, but also the lifecycle approach. However, the concepts do not appear to be immediately related in scientific panorama. This paper aims to explore the relationship between traceability and lifecycle through a systematic literature review. Six industries (Software, Manufacturing, Automotive, Automation, Aircraft, and Aerospace) and seven subject areas (Software engineering; System engineering; Industry 4.0; New product development; Process management; Data Management; and Environmental sustainability) were identified through bibliometric analysis. To better explore this relationship in the context of the food industry, a content analysis on lead papers’ sample was performed to identify traceability and lifecycle definitions, methodologies and technologies and their relation. The results of the work, synthetised in a proposed research map, will be of interest to those who are approaching the subject for the first time, and for companies involved in product lifecycle management and food traceability. 相似文献
2.
Back-analysis techniques for the improvement of the understanding of rock in underground constructions 总被引:5,自引:2,他引:5
Pierpaolo Oreste 《Tunnelling and Underground Space Technology incorporating Trenchless Technology Research》2005,20(1):7-21
In many cases, it is necessary to realize design and begin the construction of underground works with only an approximate understanding of the geomechanical parameters of the rock mass that are necessary for a correct definition of the construction technique and of the support structures. The purpose of back-analysing the measured displacements of the tunnel perimeter and the loads on the support structures during the construction of the work is to calibrate the initial estimations of the geomechanical parameters of the ground.Today the use of the back-analysis procedure is not so common and, when it is used, it does not follow a scientific scheme. Full advantage is not taken of the monitoring data, with the consequence of a waste of money.Computers are nowadays able to quickly perform many numerical analyses and therefore the time is ripe to set up a correct back-analysis procedure to use together with a calculation model of the problem, when monitoring data are available. The principles on which the treatment of information derived from the monitoring of underground works during their construction is based are shown in this paper.The paper proposes new efficient mathematical back-analysis techniques for the problem under consideration and some interesting examples.Finally, a real case is presented to which back-analysis was applied. 相似文献
3.
Dragan Aleksendrić Pierpaolo Carlone Velimir Ćirović 《Applied Composite Materials》2016,23(5):1047-1063
An intelligent optimization model aiming at off-line or pre-series optimization of the thermal curing cycle of polymer matrix composites is proposed and discussed. The computational procedure is based on the coupling of a finite element thermochemical process model, dynamic artificial neural networks and genetic algorithms. Objective of the optimization routine is the maximization of the composite degree of cure by the definition of the autoclave temperature. Obtained outcomes evidenced the capability of the method as well as its efficiency with respect to hard computing or experimental procedures. 相似文献
4.
Alberto Casagrande Joanna Jarmolowska Marcello Maria Turconi Pierpaolo Busan Piero Paolo Battaglini 《International journal of human-computer interaction》2018,34(12):1085-1104
One application of the P300 brain electric signal is sentence spelling, which enables subjects who have lost control of their motor pathways to communicate by selecting characters in a matrix containing all alphabet symbols. This technology still suffers from both low communication/high error rates. A P300 speller, named PolyMorph, which jointly introduces the selection matrix polymorphism (reducing the matrix size by removing useless symbols) and sentence-based predictions (which forecast words on the basis of language statistics) is presented. This is accomplished by using a custom dynamic knowledge-base, tailored to the subject lexicon, and updated in real time with the selections of the subject. The effectiveness of the presented speller is measured in vivo and in silico. The results suggest that the use of PolyMorph increases the number of spelt characters per time unit and reduces the error rate. 相似文献
5.
Internet is offering a variety of services that are assembled to accomplish requests made by clients. While serving a request, security of the communications and of the data exchanged among services is crucial. Since communications occur along specific channels, it is equally important to guarantee that the interactions between a client and a server never get blocked because either cannot access a selected channel. We address here both these problems, from a formal point of view. A static analysis is presented, guaranteeing that a composition of a client and of possibly nested services respects both security policies for access control, and compliance between clients and servers. 相似文献
6.
7.
Talita A. Comunian Ednelí S. Monterrey‐Quintero Marcelo Thomazini Julio C. C. Balieiro Pierpaolo Piccone Paola Pittia Carmen S. Favaro‐Trindade 《International Journal of Food Science & Technology》2011,46(6):1259-1265
The aim of this research was to study spray drying as potential action to protect chlorophyllide from environmental conditions for shelf‐life extension and characterisation of the powders. Six formulations were prepared with 7.5 and 10 g of carrier agents [gum Arabic (GA), maltodextrin (MA) and soybean protein isolate (SPI)]/100 mL of chlorophyllide solutions. The powders were evaluated for morphological characteristics (SEM), particle size, water activity, moisture, density, hygroscopicity, cold water solubility, sorption isotherms, colour and stability, during 90 days. All the powders were highly soluble, with solubility values around 97%. A significant lower hygroscopicity was observed for GA powders, whilst the lower Xm values obtained by GAB equation fitting of the sorption isotherms was observed for the 7.5 g MA/100 mL samples. All formulations, but the 1 (7.5 g SPI/100 mL of chlorophyllide), provided excellent stability to the chlorophyllide during 90 days of storage even at room temperature. 相似文献
8.
Edoardo Guerrini Pierangela Cristiani Stefano Pierpaolo Marcello Trasatti 《International Journal of Hydrogen Energy》2013
One-compartment (membraneless) microbial fuel cells (MFCs) are effective tools to test new bio-technology at a laboratory level. More efforts in MFC design and materials are necessary to move from laboratory tests to real applications. 相似文献
9.
Carlo Beatrice Chiara Guido Pierpaolo Napolitano Silvana Di Iorio Nicola Del Giacomo 《Fuel》2011,90(5):2039-2044
Results of a research project aimed at studying the capability to develop a method (economic and simple) for on-board biodiesel blending detection are described. The method is based on the direct measurement of the Indicated Mean Effective Pressure (IMEP).The study was carried out on a 2.0L four-cylinder “torque-controlled” Euro 5 diesel engine for passenger car (PC) application. This engine, equipped with instrumented glow plug for combustion closed-loop control, represents the state of the art of the diesel engine control technology.Two biodiesels were chosen for the experiments: a rapeseed methyl-ester (RME) and an aged RME, while the conventional diesel fuel was an European (EU) certification diesel fuel.Results indicate generally a good response in blending detection of the method. However, in order to attain an acceptable accuracy, a pre-calibration appears necessary. 相似文献
10.
Alessandra Gentili Valeria De Pratti Fulvia Caretti Virginia Pérez-Fernández Pierpaolo Tomai Roberta Curini 《Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment》2016,33(12):1793-1802
This paper describes a rapid method for confirming residues of thyreostats in meat-based baby foods by using liquid chromatography – dual polarity electrospray – tandem mass spectrometry (LC-ES(±)-MS/MS). Six thioureylenes, belonging to the group of thiouracil and imidazole, were selected for this work: thiouracil (TU), methylthiouracil (MTU), propylthiouracil (PTU), phenylthiouracil (PhTU), mercaptobenzimidazole (MBI) and tapazole (TAP).The amphoteric nature of these compounds allows their electrospray detection in both positive and negative ionisation. Nevertheless, MS detection is not favoured by their low molecular weights, while their chromatographic retention is also thwarted by their high polarity. A pentafluorophenyl (PFP) core-shell phase column was selected to avoid peak asymmetry or peak splitting, and a dual-polarity ionisation method was optimised to obtain a sensitivity as high as possible. The method was validated according to the Commission Decision 657/2002/EC. A simple and fast procedure based on matrix solid phase dispersion (MSPD) was optimised to extract analytes from baby foods with recoveries exceeding 82%. Limit of decision (CCα) and detection capability (CCβ) were lower than the permissible maximum concentration (10 ng g?1). The validated method was then applied to assess the potential occurrence of the six selected thyreostats in nine commercial products. All the samples were found free of contamination. 相似文献