全文获取类型
收费全文 | 218篇 |
免费 | 11篇 |
专业分类
电工技术 | 6篇 |
综合类 | 1篇 |
化学工业 | 77篇 |
机械仪表 | 5篇 |
建筑科学 | 9篇 |
能源动力 | 21篇 |
轻工业 | 16篇 |
水利工程 | 3篇 |
无线电 | 18篇 |
一般工业技术 | 21篇 |
冶金工业 | 3篇 |
原子能技术 | 6篇 |
自动化技术 | 43篇 |
出版年
2023年 | 2篇 |
2022年 | 9篇 |
2021年 | 9篇 |
2020年 | 4篇 |
2019年 | 2篇 |
2018年 | 6篇 |
2017年 | 6篇 |
2016年 | 7篇 |
2015年 | 5篇 |
2014年 | 11篇 |
2013年 | 21篇 |
2012年 | 15篇 |
2011年 | 21篇 |
2010年 | 9篇 |
2009年 | 21篇 |
2008年 | 11篇 |
2007年 | 11篇 |
2006年 | 11篇 |
2005年 | 7篇 |
2004年 | 4篇 |
2003年 | 9篇 |
2002年 | 6篇 |
2001年 | 1篇 |
2000年 | 5篇 |
1999年 | 1篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1994年 | 1篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有229条查询结果,搜索用时 31 毫秒
101.
Nadia Barbero Lucia Napione Pierluigi Quagliotto Simona Pavan Claudia Barolo Ermanno Barni Federico Bussolino Guido Viscardi 《Dyes and Pigments》2009,83(2):225-229
The interaction between glutathione S-transferase and its antibody α-glutathione S-transferase (B-14) was studied using fluorescence anisotropy, subsequent to glutathione S-transferase bioconjugation with fluorescein-5-maleimide, leading to the determination of the dissociation and association binding constants, Kd and Ka; good binding specificity was observed between glutathione S-transferase and the antibody B-14. The use of spectroscopic techniques, fluorescence anisotropy in particular, is a useful and favourable tool to study biochemical problems. 相似文献
102.
103.
Small-scale distributed cogeneration technologies represent a key resource to increase generation efficiency and reduce greenhouse gas emissions with respect to conventional separate production means. However, the diffusion of distributed cogeneration within urban areas, where air quality standards are quite stringent, brings about environmental concerns on a local level. In addition, partial-load emission worsening is often overlooked, which could lead to biased evaluations of the energy system environmental performance. 相似文献
104.
Ranieri Baraglia Renato Ferrini Pierluigi Ritrovato 《Concurrency and Computation》2005,17(13):1579-1605
In order to minimize the execution time of a parallel application running on a heterogeneously distributed computing system, an appropriate mapping scheme is needed to allocate the application tasks to the processors. The general problem of mapping tasks to machines is a well‐known NP‐hard problem and several heuristics have been proposed to approximate its optimal solution. In this paper we propose a static graph‐based mapping algorithm, called Heterogeneous Multi‐phase Mapping (HMM), which permits suboptimal mapping of a parallel application onto a heterogeneous computing distributed system by using a local search technique together with a tabu search meta‐heuristic. HMM allocates parallel tasks by exploiting the information embedded in the parallelism forms used to implement an application, and considering an affinity parameter, that identifies which machine in the heterogeneous computing system is most suitable to execute a task. We compare HMM with some leading techniques and with an exhaustive mapping algorithm. We also give an example of mapping of two real applications using HMM. Experimental results show that HMM performs well demonstrating the applicability of our approach. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
105.
Paolo Renna Pierluigi Argoneto 《The International Journal of Advanced Manufacturing Technology》2010,47(9-12):1241-1252
Multisite factories geographically distributed often have to implement an opportune tool to integrate their resources and demand forecasts in order to gather a specific production objective. The proposed research develops a distributed approach, for a network of independent enterprises, able to facilitate the capacity process by using a multiagent architecture and a cooperative protocol. The last one is based on game theory and, in particular, on Nash bargaining solution. Moreover, a discrete simulation environment has been developed to compare the proposed approach with the one in which no cooperation among enterprises exist. Several simulation scenarios were conducted to analyze the performances’ trends in various environment conditions. The goal has been the evaluation of the unallocated capacity, the unsatisfied demand, the profits generated by the network, the distribution of the transactions among the plants, and the number of activated links among plants. The simulation results show that the proposed approach leads to a better performance indexes and more relevant benefits when the dynamicity of the environment growths. 相似文献
106.
This paper discusses specific models and analyses to select the best cogeneration planning solution in the presence of uncertainties on a long-term time scale, completing the approach formulated in the companion paper (Part I). The most convenient solutions are identified among a pre-defined set of planning alternatives according to decision theory-based criteria, upon definition of weighted scenarios and by using the exceeding probabilities of suitable economic indicators as decision variables. Application of the criteria to a real energy system with various technological alternatives operated under different control strategies is illustrated and discussed. The results obtained show that using the Net Present Cost indicator it is always possible to apply the decision theory concepts to select the best planning alternative. Other economic indicators like Discounted Payback Period and Internal Rate of Return exhibit possible application limits for cogeneration planning within the decision theory framework. 相似文献
107.
A study of the interaction between fluorescein sodium salt and bovine serum albumin by steady-state fluorescence 总被引:1,自引:0,他引:1
Nadia Barbero Ermanno Barni Claudia Barolo Pierluigi Quagliotto Guido Viscardi Lucia Napione Simona Pavan Federico Bussolino 《Dyes and Pigments》2009,80(3):307-313
The binding of fluorescein sodium salt with three kinds of commercially available bovine serum albumin (BSA) of different grades of purity was investigated at 288, 298 and 313 K by fluorescence and absorption measurements at pH 7.50. The association and dissociation constants Ka and Kd were determined by the quenching of BSA fluorescence in the presence of fluorescein sodium salt. The best results were obtained by fitting raw data by non-linear regression and Lineweaver–Burk equations. The modified Stern–Volmer and Scatchard plots gave less reliable data since the fitting was much more difficult.The agreement of the constants for the three sets of measurements coming from the different BSA was not as good as expected. BSA binding properties differ depending on the different BSA grades of purity. Actually, the binding constants found for the three BSAs used differed in the same set of interactions, even by keeping the experimental conditions constant. These results are a novelty in the field of BSA–ligand binding studies and should be taken into account for future binding studies using BSA. Actually, a large number of aspects should be considered including the grade of purity and the presence of BSA covalent and non-covalent dimers, trimers and oligomers in solution which can affect the goodness of the binding results. 相似文献
108.
Olivier Morandi Fulvio Risso Pierluigi Rolando Silvio Valenti Paolo Veglia 《Design Automation for Embedded Systems》2011,15(1):51-85
Network processors are special-purpose programmable units deployed in many modern high-speed network devices, which combine
flexibility and high performance. However, software development for these platforms is traditionally cumbersome due both to
the lack of adequate programming abstractions and to the impossibility of reusing the same software on different hardware
platforms. 相似文献
109.
Silvia Vincenzetti Paolo Polidori Pierluigi Mariani Natalina Cammertoni Francesco Fantuz Alberto Vita 《Food chemistry》2008
Donkey’s milk may be considered a valid alternative, for infant nutrition, to powdered milks, soybean milk or other formulas, since its composition in lipids and proteins is very close to human milk. The aim of the present study is to characterize “donkey’s milk” product, especially with regard to the protein fractions. Three different chromatographic approaches for donkey’s milk proteins separation are described, based on their different isoelectric points, hydrophobicity and molecular mass. The proteins obtained were further separated by sodium dodecyl sulphate polyacrylamide gel electrophoresis and identified by N-terminal sequencing. αS1- and β-caseins, lysozyme, α-lactalbumin, β-lactoglobulin were identified. Furthermore, the content of α-lactalbumin, β-lactoglobulin, and lysozyme in donkey’s milk was determined by a reversed-phase HPLC method. The β-lactoglobulin and α-lactalbumin content was 3.75 and 1.8 mg/ml, respectively (mean values). The present study showed the nutritional properties of donkey’s milk characterized by low casein and high lysozyme content (1.0 mg/ml) compared with other kinds of milks. 相似文献
110.
Pierluigi Argoneto Paolo Renna 《The International Journal of Advanced Manufacturing Technology》2013,69(5-8):1907-1916
In this paper, we analyze a model of capacity sharing for a set of independent firms, geographically distributed, that often have to implement an opportune tool to integrate their resources and demand forecasts in order to gather a specific production objective. We formulate the problem as a cooperative game and identify a capacity sharing solution using the Gale–Shapley model. The allocation rule takes into account the utility functions of the involved firms, and we show how the capacity allocation rule can be designed to induce all firms to report truthfully their information. Moreover, we show that, under this allocation rule, truth telling is a dominant strategy, with each firm reporting truthfully its private information, regardless of the reporting decisions of other firms. Moreover, the proposed research develops a distributed approach able to facilitate the capacity sharing process by using a multi-agent architecture; then a discrete simulation environment has been developed to compare the proposed approach with a centralized one. Several simulation scenarios were conducted to analyze the performances' trends in various environment conditions. 相似文献