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排序方式: 共有156条查询结果,搜索用时 265 毫秒
31.
Hana Sebestova Hana Chmelickova Libor Nozka Jiri Moudry 《Journal of Materials Engineering and Performance》2012,21(5):764-769
Laser welding is a high power density technology of materials joining that has many advantages in comparison with conventional
fusion welding methods, for example, high accuracy, flexibility, repeatability and especially very narrow heat-affected zone
which results in minimal workpiece distortions. Since it is still quite expensive technology, minimal spoilage is required.
Effective system of quality control and processing parameters optimization must be established to reduce total costs, which
is particularly required in industrial production. In this article some results of pulsed Nd:YAG laser welding process monitoring
based on the measurement of plasma electron temperature are presented. The ability of designed sensor to detect weld penetration
depth has been demonstrated. Plasma spectral lines intensities measurement can discover gap instabilities as well as local
sheet thickness reduction. 相似文献
32.
Monika Absolonová Lucie Melounková Dr. Jaromír Vinklárek Dr. Jan Honzíček Libor Dostál Dr. Ondřej Mrózek 《ChemMedChem》2021,16(11):1805-1813
Cytotoxic complexes containing molybdenum are widely studied as a potential substitution for commercially used drugs that often suffer from pronounced side effects and cellular resistance. Compounds of the type [(η5-Cp′)Mo(CO)2(N,NL)][BF4], where Cp is cyclopentadienyl and N,NL is a bidentate ligand, are well known for their strong anticancer activity. It is a generally accepted paradigm that the nature of the coordinated N,NL ligand has a major impact on the cytotoxicity. In this study, a series of new functionalised Cp complexes of molybdenum was synthesised from derivatised fulvenes as π-ligand precursors. Indeed, the coordination sphere‘s modulation by various N,N-chelating ligands afforded species active toward leukemic cell line MOLT-4 with IC50 values depending on the character of the N,N-chelator used. However, following study clearly showed that functionalisation of the Cp ring with an amine moiety considerably improved cytotoxicity. These results are of crucial importance for the future design of highly active cytotoxic drugs, as modification of cyclopentadienyl is believed to have a minor effect on biological activity. 相似文献
33.
Libor ervený Jana Mojíov Vlastimil Rr
i
ka 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1985,35(4):157-160
The effect of structure of substrates and solvents on the process of competitive hydrogenation of binary mixtures of olefinic substrates in the liquid state on 5% Pt/SiO2 catalyst has been investigated. The hydrogenations were carried out at 20°C under atmospheric pressure of hydrogen in the absence of solvent, in methanol and in cyclohexane; one series was also performed in sec-butanol and in tert-butanol. Selectivity changed markedly owing to the different adsorptivity of the substrates. In more polar solvents hydrogenation of less polar substates was relatively preferred. 相似文献
34.
Petr Kluson Libor Cerveny Marie Krivska Jiri Had Simona Laurentova 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1994,59(4):409-415
Charcoal-, silica-, alumina- and titanium(IV) oxide-supported ruthenium catalysts, prepared by conventional impregnation and incipient wetness methods from a ruthenium(III) oxide precursor were tested in copper(II) formate decomposition in aqueous solution. Such a reaction was found to be an efficient and simple activity test of charcoal-supported catalysts. The application of this reaction for a bimetallic ruthenium–copper catalyst preparation was also suggested. Experimental results were compared with those obtained using commercial catalysts and ruthenium black. 相似文献
35.
Can one considerably shorten a proof for a quantum problem by using a protocol with a constant number of unentangled provers? We consider a frustration-free variant of the \(\textsf {QCMA}\)-complete ground state connectivity (GSCON) problem for a system of size n with a proof of superlinear size. We show that we can shorten this proof in \(\textsf {QMA}(2)\): There exists a two-copy, unentangled proof with length of order n, up to logarithmic factors, while the completeness–soundness gap of the new protocol becomes a small inverse polynomial in n. 相似文献
36.
37.
FPGA-based module for SURF extraction 总被引:1,自引:0,他引:1
Tomáš Krajník Jan Šváb Sol Pedre Petr Čížek Libor Přeučil 《Machine Vision and Applications》2014,25(3):787-800
We present a complete hardware and software solution of an FPGA-based computer vision embedded module capable of carrying out SURF image features extraction algorithm. Aside from image analysis, the module embeds a Linux distribution that allows to run programs specifically tailored for particular applications. The module is based on a Virtex-5 FXT FPGA which features powerful configurable logic and an embedded PowerPC processor. We describe the module hardware as well as the custom FPGA image processing cores that implement the algorithm’s most computationally expensive process, the interest point detection. The module’s overall performance is evaluated and compared to CPU and GPU-based solutions. Results show that the embedded module achieves comparable distinctiveness to the SURF software implementation running in a standard CPU while being faster and consuming significantly less power and space. Thus, it allows to use the SURF algorithm in applications with power and spatial constraints, such as autonomous navigation of small mobile robots. 相似文献
38.
Jan Faigl Miroslav Kulich Libor P?eu?il 《Journal of Intelligent and Robotic Systems》2011,62(3-4):329-353
In this paper, we address the inspection planning problem to ??see?? the whole area of the given workspace by a mobile robot. The problem is decoupled into the sensor placement problem and the multi-goal path planning problem to visit found sensing locations. However the decoupled approach provides a feasible solution, its overall quality can be poor, because the sub-problems are solved independently. We propose a new randomized approach that considers the path planning problem during solution process of the sensor placement problem. The proposed algorithm is based on a guiding of the randomization process according to prior knowledge about the environment. The algorithm is compared with two algorithms already used in the inspection planning. Performance of the algorithms is evaluated in several real environments and for a set of visibility ranges. The proposed algorithm provides better solutions in both evaluated criterions: a number of sensing locations and a length of the inspection path. 相似文献
39.
Tremendous reinforcing,pore‐stabilizing and response‐accelerating effect of in situ generated nanosilica in thermoresponsive poly(N‐isopropylacrylamide) cryogels
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The tremendous reinforcing and pore‐stabilizing effect of in situ formed nanosilica in a highly porous temperature‐responsive poly(N‐isopropylacrylamide) (PNIPA) matrix is demonstrated. A very weakly crosslinked semi‐liquid hydrogel can be reinforced to the point that it displays a fast, extensive and nearly symmetric temperature‐responsiveness in combination with an acceptable modulus. In soft but solid porous PNIPA, only 0.6 wt% of the nanofiller is sufficient to stabilize the pores against collapse upon de‐swelling, thus enabling ultrafast responsiveness. A spectacular effect is achieved with dried porous PNIPA (matrix is glassy, Tg ≈ 140 °C), which in the case of optimal nanosilica amounts can re‐swell in only 3 min. The key importance of efficient hydrogen bridging between PNIPA and SiO2 is demonstrated by comparing in situ formed nanosilica with similarly sized commercial Ludox particles, the surface of which is saturated with ammonia (for stabilization). Synthesis parameters like the amount of crosslinker and of nanosilica were varied in a wide range, in order to achieve the fastest possible responsiveness of the hydrogels in combination with a high modulus. The porosity, nanosilica distribution, moduli, temperature‐dependent swelling as well as the swelling kinetics of the gels were determined as functions of contents of crosslinker and nanosilica. © 2017 Society of Chemical Industry 相似文献
40.