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11.
Akihiro Nishiguchi Fumisato Sasaki Hidehito Maeda Masayuki Kabayama Akio Ido Tetsushi Taguchi 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(35)
Endoscopic submucosal dissection (ESD) provides strong therapeutic benefits for early gastrointestinal cancer as a minimally invasive treatment. However, there is currently no reliable treatment to prevent scar contracture resulting from ESD which may lead to cicatricial stricture. Herein, a multifunctional colloidal wound dressing to promote tissue regeneration after ESD is demonstrated. This sprayable wound dressing, composed of hydrophobized microparticles, exhibits the multifunctionality necessary for wound healing including tissue adhesiveness, blood coagulation, re‐epithelialization, angiogenesis, and controlled inflammation based on hydrophobic interaction with biological systems. An in vivo feasibility study using swine gastric ESD models reveals that this colloidal wound dressing suppresses fibrosis and accelerates wound healing. Multifunctional colloidal and sprayable wound dressings have an enormous therapeutic potential for use in a wide range of biomedical applications including accelerated wound healing after ESD, prevention of perforation, and the treatment of inflammatory diseases. 相似文献
12.
Feeding Responses of Free-flying Honeybees to Secondary Compounds Mimicking Floral Nectars 总被引:1,自引:0,他引:1
The role of secondary compounds (SC) in deterring herbivores and pathogens from vegetative parts of plants is well established,
whereas their role in plant reproductive organs such as floral nectar is unclear. The present study aimed to reveal the response
of free-flying honeybees to naturally occurring concentrations of four SC in floral nectar. We selected nicotine, anabasine,
caffeine, and amygdalin, all of which are found in nectar of various plants. In repeated paired-choice experiments, we offered
20% sucrose solution as control along with test solutions of 20% sucrose with various concentrations of the above SC. Except
for anabasine, naturally occurring concentrations of SC did not have a deterring effect. Furthermore, low concentrations of
nicotine and caffeine elicited a significant feeding preference. SC can, therefore, be regarded as postingestive stimulants
to pollinators, indicating that the psychoactive alkaloids in nectar may be a part of their mutualistic reward. Further studies
are needed to test our hypothesis that psychoactive alkaloids in nectar impose dependence or addiction effects on pollinators. 相似文献
13.
In the field of the scaling-up of communication networks, numbers of communication stations (nodes) and the corresponding
communication links (edges) are increasing rapidly. The reliability of the networks then becomes important. To keep the reliability
of the networks, the connectivity (invulnerability) of the networks should not decrease. In this article, a method of increasing
the nodes of a graph with a constant connectivity is proposed, and some examples of graph extension are shown to realize the
extended networks.
This work was presented in part at the 11th International Symposium on Artificial Life and Robotics, Oita, Japan, January
23–25, 2006 相似文献
14.
One of the important future issues is how agriculture production can meet the future demand increase due to the population and the income growth. Global warming would give both positive and negative impacts on them. Agriculture is often expected to supply biofuels to meet the growing transportation energy demand and the warming control policy. GISELA – GIS-based evaluation for land use and agriculture production model – is developed to evaluate the current and the potential cropland for rice, wheat, maize and soy-beans production under climate changes. We also assess the food and the feed demand based on the historical regional statistics for world into 18 regions. Finally, we assess the future food market integrating the above supply and demand conditions developing a dynamic optimization model, GISELA. Current GISELA findings are as follows: (1) potential cropland in south America will be extensively cultivated, (2) market price of wheat and soy will gradually go up while that of maize is almost stable in medium yield case, and (3) in the low-yield case, all crop prices hike rapidly in the mid of this century. 相似文献
15.
Y. Toda J. Sekiya Y. H. Liu N. Momono M. Oda M. Ido 《Journal of Superconductivity and Novel Magnetism》2010,23(5):871-872
We investigate nonequilibrium quasiparticle dynamics measured by ultrafast optical spectroscopy on underdoped Bi2212 crystals, which provide direct evidence that superconducting (SC) and pseudogap (PG) quasiparticles coexist below T c . We verify that the ratio of signals from SC and PG quasiparticles depends on both excitation energy and polarization of the probe beam due to the anisotropy of the probe transition matrix elements and the interband transition probability. Based on this property, we successfully separate the SC or PG component and precisely evaluate the temperature dependence of them across T c . 相似文献
16.
Cluster ranking with an application to mining mailbox networks 总被引:1,自引:1,他引:0
Ziv Bar-Yossef Ido Guy Ronny Lempel Yoëlle S. Maarek Vladimir Soroka 《Knowledge and Information Systems》2008,14(1):101-139
We initiate the study of a new clustering framework, called cluster ranking. Rather than simply partitioning a network into clusters, a cluster ranking algorithm also orders the clusters by their strength. To this end, we introduce a novel strength measure for clusters—the integrated cohesion—which is applicable to arbitrary weighted networks. We then present a new cluster ranking algorithm, called C-Rank. We provide
extensive theoretical and empirical analysis of C-Rank and show that it is likely to have high precision and recall. A main
component of C-Rank is a heuristic algorithm for finding sparse vertex separators. At the core of this algorithm is a new
connection between vertex betweenness and multicommodity flow. Our experiments focus on mining mailbox networks. A mailbox network is an egocentric social network, consisting of contacts with whom an individual exchanges email. Edges
between contacts represent the frequency of their co–occurrence on message headers. C-Rank is well suited to mine such networks,
since they are abundant with overlapping communities of highly variable strengths. We demonstrate the effectiveness of C-Rank
on the Enron data set, consisting of 130 mailbox networks. 相似文献
17.
Leichter Ido Lindenbaum Michael Rivlin Ehud 《IEEE transactions on pattern analysis and machine intelligence》2009,31(1):164-171
Kernel-based trackers aggregate image features within the support of a kernel (a mask) regardless of their spatial structure. These trackers spatially fit the kernel (usually in location and in scale) such that a function of the aggregate is optimized. We propose a kernel-based visual tracker that exploits the constancy of color and the presence of color edges along the target boundary. The tracker estimates the best affinity of a spatially aligned pair of kernels, one of which is color-related and the other of which is object boundary-related. In a sense, this work extends previous kernel-based trackers by incorporating the object boundary cue into the tracking process and by allowing the kernels to be affinely transformed instead of only translated and isotropically scaled. These two extensions make for more precise target localization. A more accurately localized target also facilitates safer updating of its reference color model, further enhancing the tracker's robustness. The improved tracking is demonstrated for several challenging image sequences. 相似文献
18.
This paper describes the formation of a third liquid phase in a phase transfer catalytic system in the presence of benzyl alcohol and potassium hydroxide, where dodecane and tetraalkylammonium bromide serve as organic solvent and catalyst, respectively. In this kind of system, a symmetrical ether (dibenzyl ether) was synthesized from benzyl chloride and benzyl alcohol at 323 K. In particular, the investigation demonstrates that the observed reaction rate constant depends on the length of the alkyl group of the catalyst. Tetrabutylammonium bromide exhibits the highest catalytic activity among the catalysts explored. With respect to the reuse of the third liquid phase, the results confirm that there is no decrease in phase transfer catalytic activity in three consecutive runs. 相似文献
19.
A neutronic analysis of the laser-driven inertial-confinement fusion reactor SENRI-I is presented. Three-dimensional Monte Carlo calculations were performed to examine the effects of laser beam ports on the flux distribution, tritium breeding ratio, thermal energy deposition in the blanket, and radiation streaming. A Monte Carlo code was also used for the time-dependent radiation-damage analysis accounting for the time of the flight spread of neutrons and the results are compared to the analysis for the HIBALL design. Induced radioactivity was estimated, based on the one-dimensional transport calculation and depletion analysis. The calculated results reveal the advantages of the SENRI-I design with a thick Li layer compared to other reactor systems employing a dry-wall scheme. 相似文献
20.