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排序方式: 共有416条查询结果,搜索用时 15 毫秒
71.
Dietrich Braun Burkhard Schmiedel Gtz P. Hellmann Morand Lambla Michael Schneider 《大分子材料与工程》1998,254(1):79-84
Natural latex (NR) particles, modified with a hard shell of poly(methyl methacrylate) (PMMA) and with a substructure of PMMA (type "NR-M") or polystyrene (type "NR-SM"), were tested as compatibilizers in blends of polycarbonate (of bisphenol A, PC) and PMMA or PS. During melt blending, the modified NR particles were torn apart, from an original size of >0.5 μm down to ≅0.1 μm in diameter. Two different types of particle distribution were observed in the blends: in PC/PMMA/NR-M blends, the NR-M particles were dispersed in the PMMA phase, whereas, in PC/PS/NR-SM blends, the NR-SM particles formed interface layers between PC and PS phase domains. The latter blend morphology, distinguished by continuous rubbery interface layers of NR-SM, turned out to be mechanically excellent in injection-moulded parts. The poor impact strength of PC/PS was raised by an order of magnitude. The effect depends on the orientation in the injection-moulded test bars. 相似文献
72.
73.
74.
Burkhard H. Freyer P. Stephan Heyns Nico J. Theron 《Journal of Intelligent Manufacturing》2014,25(3):473-487
Signal processing using orthogonal cutting force components for tool condition monitoring has established itself in literature. In the application of single axis strain sensors however a linear combination of cutting force components has to be processed in order to monitor tool wear. This situation may arise when a single axis piezoelectric actuator is simultaneously used as an actuator and a sensor, e.g. its vibration control feedback signal exploited for monitoring purposes. The current paper therefore compares processing of a linear combination of cutting force components to the reference case of processing orthogonal components. Reconstruction of the dynamic force acting at the tool tip from signals obtained during measurements using a strain gauge instrumented tool holder in a turning process is described. An application of this dynamic force signal was simulated on a filter-model of that tool holder that would carry a self-sensing actuator. For comparison of the orthogonal and unidirectional force component tool wear monitoring strategies the same time-delay neural network structure has been applied. Wear-sensitive features are determined by wavelet packet analysis to provide information for tool wear estimation. The probability of a difference less than 5 percentage points between the flank wear estimation errors of above mentioned two processing strategies is at least 95 %. This suggests the viability of simultaneous monitoring and control by using a self-sensing actuator. 相似文献
75.
He Min Wu Xiaolong Zheng Si Qing Englert Burkhard 《Parallel and Distributed Systems, IEEE Transactions on》2010,21(3):303-312
In recent years, many researchers have investigated optical interconnections as parallel computing. Optical interconnections are attractive due to their high bandwidth and concurrent access to the bus in a pipelined fashion. The Linear Array with Reconfigurable Pipelined Bus System (LARPBS) model is a powerful optical bus system that combines both the advantages of optical buses and reconfiguration. To increase the scalability of the LARPBS model, we propose a two-dimensional extension: a simplified two-dimensional Array with Reconfigurable Pipelined Bus System (2D ARPBS). While achieving better scalability, we show the effectiveness of this newly proposed model by designing two novel optimal sorting algorithms on this model. The first sorting algorithm is an extension of Leighton's seven-phase columnsort algorithm that eliminates the restriction of sorting only an r times s array, where r ge s^2 , and sorts an n times n array in O(log n) time. The second one is an optimal multiway mergesort algorithm that uses a novel processor efficient two-way mergesort algorithm and a novel multiway merge scheme to sort n^2 items in O(log n) time. Using an optimal sorting algorithm Pipelined Mergesort designed for the LARPBS model as a building block, we extend our research on parallel sorting on the LARPBS to a more scalable 2D ARPBS model and achieve optimality in both sorting algorithms. 相似文献
76.
Burkhard Schafer 《Datenschutz und Datensicherheit - DuD》2016,40(9):592-597
In March 2016, the UK Government put the Investigatory Powers Bill before Parliament. The new law, if enacted, will considerably increase the powers of law enforcement and security services regarding mass data retention, mass surveillance and mass hacking. This raises considerable concerns not just about the content of the Bill and its impact on privacy, but also about the method of its enactment and the ever diminishing parliamentary and judicial scrutiny of surveillance legislation in the UK. 相似文献
77.
Burkhard Monien 《Acta Informatica》1977,8(4):371-382
Summary It is shown, that NTAPE(n) is equal to TAPE(n) if and only if every language L⊂⊣{1}*⊢ which is acceptable by a nondeterministic two-way one-counter automaton whose counter length is bounded by the length of
its input is contained in TAPE(log n). 相似文献
78.
Burkhard Monien 《Theory of Computing Systems》1975,9(3):248-264
In this paper a machine model is defined whose access to the storage cells is controlled by means of address registers. It is shown that every set acceptable by such a machine within time boundcn
p,p , is accepted by a deterministic 2p-head two-way pushdown automaton which has additional counters of length log2
n. On the other hand every set acceptable by a deterministicp-head two-way pushdown automaton can be accepted by this machine model within time boundcn
plog2
n.
A result similar to one of the main theorems (theorem 4) of this paper has been proved also by S. A. Cook. Both proofs are based on the same idea but have been found independently. 相似文献
79.
Quantification is a major task in proteomics. Among the different analytical strategies to enable peptide and protein quantification, tagging with isotopic labels has emerged as a practical, versatile, and efficient alternative. In particular, isobaric labels, such as TMT or iTRAQ, are now widely employed to make relative comparison of the protein amounts in separate biological samples with tandem mass spectrometry (MS/MS). We used herein a shotgun proteomic approach based on labelling with tandem mass tags (TMTs) for the relative quantification of proteins, and the absolute quantification of their tryptic peptides in human cerebrospinal fluid (CSF). First, the comparison of ante- and post-mortem CSF samples was carried out for the discovery of protein marker candidates of brain-damage disorders. Second, tryptic peptides representative of these candidates were measured in CSF using reporter-ion calibration curves. These works highlighted the advantages and limitations of such strategies for quantification purposes in proteomics. 相似文献
80.
Burkhard Talebitari 《Stahlbau》2015,84(10):823-823