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1.
Use of the Retarded Solution-Reprecipitation Process to Attain a Higher Initial Permeability in MnZn Ferrites 总被引:1,自引:0,他引:1
Miha Drofenik rej nidari Darko Makovec 《Journal of the American Ceramic Society》2003,86(9):1601-1604
We investigated the effect of various amounts of liquid phase on microstructure development during sintering and the resulting magnetic permeability of MnZn ferrite (MZF) samples. Our results revealed that the microstructure and the final magnetic permeability depend on the thickness of the liquid-phase film during sintering. The solution-reprecipitation (S-R) process, which is associated with an intensive microstructure development in MZF, starts when a continuous liquid-phase film of critical thickness δo , which wets the MZF grains, is formed. The solid-state sintering that takes place before the formation of the continuous liquid-phase film is essential for the final microstructure of MZF. 相似文献
2.
If structural reliability is estimated by following a strain-based approach, a material’s strength should be represented by the scatter of the ε–N (E–N) curves that link the strain amplitude with the corresponding statistical distribution of the number of cycles-to-failure. The basic shape of the ε–N curve is usually modelled by the Coffin–Manson relationship. If a loading mean level also needs to be considered, the original Coffin–Manson relationship is modified to account for the non-zero mean level of the loading, which can be achieved by using a Smith–Watson–Topper modification of the original Coffin–Manson relationship. In this paper, a methodology for estimating the dependence of the statistical distribution of the number of cycles-to-failure on the Smith–Watson–Topper modification is presented. The statistical distribution of the number of cycles-to-failure was modelled with a two-parametric Weibull probability density function. The core of the presented methodology is represented by a multilayer perceptron neural network combined with the Weibull probability density function using a size parameter that follows the Smith–Watson–Topper analytical model. The article presents the theoretical background of the methodology and its application in the case of experimental fatigue data. The results show that it is possible to model ε–N curves and their scatter for different influential parameters, such as the specimen’s diameter and the testing temperature. 相似文献
3.
Relationship between the Undrained Shear Strength, Water Content, and Mineralogical Properties of Fine-Grained Soils 总被引:2,自引:0,他引:2
The relationship between the undrained shear strength of fine-grained soils and the water content can be described with a nonlinear function in which the type of soil is determined by two parameters. It is well known that these parameters depend mainly on the mineral compositions of soils; these relationships, however, have not yet been investigated. The findings described in this paper define those mineralogical properties of soils which determine the values of both parameters. Experimentally obtained results suggest that the parameters primarily depend on the size of the clay minerals, their quantity in soil composition, and the interlayer water quantity in the expanding clay minerals. As this dependence is well defined, the parameters, and thus the undrained shear strength at different water content, can be defined from knowledge of these mineralogical soil properties. 相似文献
4.
Miha Renko Tanja Zupan David F. Plaza Stefanie S. Schmieder Milica Perii Nanut Janko Kos Duan Turk Markus Künzler Jerica Saboti
《International journal of molecular sciences》2022,23(9)
We introduce a new family of fungal protease inhibitors with β-trefoil fold from the mushroom Coprinopsis cinerea, named cocaprins, which inhibit both cysteine and aspartic proteases. Two cocaprin-encoding genes are differentially expressed in fungal tissues. One is highly transcribed in vegetative mycelium and the other in the stipes of mature fruiting bodies. Cocaprins are small proteins (15 kDa) with acidic isoelectric points that form dimers. The three-dimensional structure of cocaprin 1 showed similarity to fungal β-trefoil lectins. Cocaprins inhibit plant C1 family cysteine proteases with Ki in the micromolar range, but do not inhibit the C13 family protease legumain, which distinguishes them from mycocypins. Cocaprins also inhibit the aspartic protease pepsin with Ki in the low micromolar range. Mutagenesis revealed that the β2-β3 loop is involved in the inhibition of cysteine proteases and that the inhibitory reactive sites for aspartic and cysteine proteases are located at different positions on the protein. Their biological function is thought to be the regulation of endogenous proteolytic activities or in defense against fungal antagonists. Cocaprins are the first characterized aspartic protease inhibitors with β-trefoil fold from fungi, and demonstrate the incredible plasticity of loop functionalization in fungal proteins with β-trefoil fold. 相似文献
5.
Quantum-dot cellular automaton (QCA) is an emergent technology that is not hindered by quantum effects that limit the scaling of CMOS technology, but instead employs them to perform computation. However, this brings its own impediments, such as the influence of the thermodynamic effects. Beside that, QCA has to be coupled with CMOS circuitry of different size features to enable clocking. We discussed all these facts and devised a floorplan which would facilitate manufacturability. Based on it we developed the process of QCA layout design and defined the design rules that must be considered in order to ensure correct operation. These instructions enable the automatization of designing a QCA circuit layout. 相似文献
6.
Petra Jenus Darja Lisjak Danjela Kuscer Darko Makovec Miha Drofenik 《Journal of the American Ceramic Society》2014,97(1):74-80
Magneto‐electric (ME) ceramic composites of cobalt ferrite (CoF) and lead zirconate titanate (PZT) were prepared by mechanical mixing of the constituent powders followed by cosintering. The cosintering conditions for nano‐sized CoF and submicrometer‐sized PZT powders were studied in detail. It was found that the CoF powder needs to be presintered at 700°C for 2 h to minimize the differences in the sintering kinetics of the constituent powders. Despite the low cosintering temperatures (900°C–1000°C) the interdiffusion of the cations from both phases was confirmed with energy‐dispersive X‐ray analysis and X‐ray diffraction. Efforts were made to optimize the cosintering conditions to prepare dense ceramic ME composites, which showed the converse ME effect. 相似文献
7.
Hydrothermal Synthesis of Ba-Hexaferrite Nanoparticles 总被引:1,自引:0,他引:1
Miha Drofenik Matja Kristl rej nidari Darko Hanel Darja Lisjak 《Journal of the American Ceramic Society》2007,90(7):2057-2061
Barium hexaferrite BaFe12 O19 nanoparticles with a single-domain size were synthesized using a controlled hydrothermal process involving the LaMer–Dinger principle and the Ostwald ripening mechanism. Nanocrystalline particles of BaFe12 O19 were obtained when the molar ratio of the precursor composition Ba(OH)2 ·8H2 O/γ-Fe2 O3 was 0.3 and the concentration of the suspension was about 1 wt%. The as-synthesized crystalline BaFe12 O19 platelets approximately 50 nm in length and 5 nm in thickness exhibited a saturation magnetization of 40 Am2 /kg. 相似文献
8.
Danjela Kuščer Miha Skalar Janez Holc Marija Kosec 《Journal of the European Ceramic Society》2009,29(1):105-113
We have investigated the processing of 0.65Pb(Mg1/3Nb2/3)O3–0.35PbTiO3 (PMN–PT) thick films on platinised alumina substrates. Nanosized PMN–PT powder with 2 mol% of excess PbO was prepared by high-energy milling and deposited on the substrate using screen-printing technology. The films were then sintered at 950 °C in a PbO-rich atmosphere. The influence of the sintering time and the amount of PbO-containing packing powder was studied and related to the structural, microstructural, dielectric and piezoelectric properties of the film. In order to obtain a homogeneous and dense thick film without any secondary phase, the PMN–PT films had to be sintered in the presence of a PbO-based liquid phase that had to be completely removed from the thick film during the final stage of the sintering. Under optimal sintering conditions we obtained a room temperature relative dielectric permittivity of 3600, dielectric losses of 0.036, a Tm of 174 °C, a permittivity at the Tm of 21,000 and a d33 of 140 pC/N. 相似文献
9.
CAD/CAM systems are nowadays tightly connected to ensure that CAD data can be used for optimal tool path determination and
generation of CNC programs for machine tools. The aim of our research is the design of a computer-aided, intelligent and genetic
algorithm(GA) based programming system for CNC cutting tools selection, tool sequences planning and optimisation of cutting
conditions. The first step is geometrical feature recognition and classification. On the basis of recognised features the
module for GA-based determination of technological data determine cutting tools, cutting parameters (according to work piece
material and cutting tool material) and detailed tool sequence planning. Material, which will be removed, is split into several
cuts, each consisting of a number of basic tool movements. In the next step, GA operations such as reproduction, crossover
and mutation are applied. The process of GA-based optimisation runs in cycles in which new generations of individuals are
created with increased average fitness of a population. During the evaluation of calculated results (generated NC programmes)
several rules and constraints like rapid and cutting tool movement, collision, clamping and minimum machining time, which
represent the fitness function, were taken into account.
A case study was made for the turning operation of a rotational part. The results show that the GA-based programming has a
higher efficiency. The total machining time was reduced by 16%. The demand for a high skilled worker on CAD/CAM systems and
CNC machine tools was also reduced.
Received: September 2004 / Accepted: September 2005 相似文献
10.
Miha Možina Dejan Tomaževič Franjo Pernuš Boštjan Likar 《Machine Vision and Applications》2013,24(1):63-73
Visual appearance is an important quality factor of pharmaceutical tablets. Moreover, it plays a key role in identification of tablets, which is needed to prevent mix-ups among various types of tablets. Since identification of tablets is most frequently done by imprints, good imprint quality, a property that makes the imprint readable, is of utmost importance in preventing mix-ups among the tablets. In this paper, we propose a novel method for automated visual inspection of tablets. Besides defect detection, imprint quality inspection is also considered. Performance of the method was evaluated on three different real tablet image databases of imprinted tablets. A “gold standard” was established by manually classifying tablets into a good and a defective class. The receiver operating characteristics (ROC) analysis indicated that the proposed method yields better sensitivity and specificity than the previous defect detection method. 相似文献