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排序方式: 共有60条查询结果,搜索用时 15 毫秒
1.
Juras Banys Saulius Rudys Maksim Ivanov Jing Li Hong Wang 《Journal of the European Ceramic Society》2010,30(2):385-388
In this work dielectric properties of Bi1.5Zn1?xLixNb1.5O7?xFx with x = 0.25 were investigated in a 20 Hz–12 GHz frequency and 120–500 K temperature range and compared to that of regular cubic BZN (when x = 0). Measurements showed that both ceramics have dipolar glass type dielectric dispersion with wide relaxation time distributions. Mean relaxation time follows Arrhenius law in the investigated frequency range, although Vogel–Fulcher law was anticipated. 相似文献
2.
Source-based radiometry requires reliable transfer standards which are easy to handle. For low irradiances in the UV spectral
range, 30 W deuterium lamps are commonly used. However, for the growing field of high UV irradiance applications, new high
power standards are required. Here we report on a Xe-Hg lamp system which has been characterised and improved to match the
high requirements of a working standard. For this purpose, several parameters of the system such as lamp stability, re-ignition
reproducibility, irradiance uniformity and usability have been investigated. Components for the customised light guide-based
output optics have been selected with the help of extensive characterisations. The resulting lamp system can be used for a
high-grade instrument calibration at high UV irradiance levels. 相似文献
3.
J. Tamuliene A. Tamulis M. L. Balevicius A. Graja 《Fullerenes, Nanotubes and Carbon Nanostructures》2000,8(3):165-178
Geometry and energy of formation of single molecules: fullerene C60, CS2 and tetrathiofulvalene (TTF) and their complexes: C60 +CS2 and C60 +TTF were obtained using Hartree-Fock (HF) and Density Functional Theory methods in various basis sets. Weak chemical interactions were estimated enough well using HF/6-31G for a comparison of various geometrical conformations of these complexes. Energy of formation evaluation in charge-transfer complex C60 +TTF is performing additionally calculating complex with far-separated molecules. 相似文献
4.
Ripples are formed on the surface of solid materials after interaction with laser pulses of high intensity/irradiance. When ultra-short sub-1 ps laser pulses are used, the observed morphology of ripples on surfaces becomes much more complex as compared with ripples formed by long laser pulses. Uniquely for the short laser pulses, ripples can be formed in the bulk. A better understanding of the fundamentals of light-matter interaction in ripples formation is strongly required. Experimentally observed ripples and dependence of their parameters on laser fabrication conditions and material properties are summarized first. Then, a critical review of relevant ripple formation mechanisms is presented, discussed, and formation conjectures are presented. 相似文献
5.
Total internal reflection ellipsometry (TIRE) technique was used to investigate the optical response of different hybrid multilayer systems. It was shown that the optical response was significantly changed by gold nanoparticles, which have been introduced for modification of functional properties of hybrid system. Nevertheless, the dispersion of optical parameters for gold nanoparticles was quite close in various hybrid systems in the case of adequate models used for interpretation of TIRE data. 相似文献
6.
Buividas R Rosa L Sliupas R Kudrius T Slekys G Datsyuk V Juodkazis S 《Nanotechnology》2011,22(5):055304
The mechanism of the fine ripples, perpendicular to laser polarization, on the surface of (semi)transparent materials with period smaller than the vacuum wavelength, λ, of the incident radiation is proposed and experimentally validated. The sphere-to-plane transformation of nanoplasma bubbles responsible for the in-bulk ripples accounts for the fine ripples on the surface of dielectrics and semiconductors. The mechanism is demonstrated for 4H:SiC and sapphire surfaces using 800 nm/150 fs and 1030 nm/300 fs laser pulses. The ripples are pinned to the smallest possible standing wave cavity inside material of refractive index n. This defines the corresponding period, Λ = (λ/n)/2, of a light standing wave with intensity, E(2), at the maxima of which surface ablation occurs. The mechanism accounts for the fine ripples at the breakdown conditions. Comparison with ripples recorded on different materials and via other mechanisms using femtosecond pulses is presented and application potential is discussed. 相似文献
7.
Nils-Erik Wiberg Fethi Abdulwahab Saulius Ziukas 《International journal for numerical methods in engineering》1994,37(20):3417-3440
Patch recovery based on superconvergent derivatives and equilibrium (SPRE), an enhancement of the Superconvergent Patch Recovery (SPR), is studied for linear elasticity problems. The paper also presents a further improvement for recovery of derivatives near boundaries, SPREB, where either tractions or displacements are prescribed. This is made by inclusion of weighted residual errors at boundary points in the patch recovery. A pronounced improvement in the post processed gradients of the finite element solution is observed by this method. 相似文献
8.
Balevicius S. Pyragas V. Zurauskiene N. Altgilbers L.L. 《Applied Superconductivity, IEEE Transactions on》2004,14(1):112-118
The results of a study of irreversible damage induced in microstrips made from high-T/sub c/ thin films by high-power electromagnetic pulses is presented. It was demonstrated that at high supercritical currents, the magnetic flux flow process induces fast thermomagnetic instability. The result of this instability is local magnetic flux propagation, and subsequent irreversible damage of the high-T/sub c/ film. The parameter D=(I/sub d/-I/sub c/)/I/sub c/, where I/sub d/ and I/sub c/ are the critical damaging and superconducting-to-dissipative state transition currents, respectively, which represents the capability of the high-T/sub c/ microstrip to withstand supercritical current, depends on the quality and critical current density of the film. 相似文献
9.
Alemayehu Nana Koya Joao Cunha Karina Andrea Guerrero-Becerra Denis Garoli Tao Wang Saulius Juodkazis Remo Proietti Zaccaria 《Advanced functional materials》2021,31(41):2103706
Extreme confinement of electromagnetic waves and mechanical displacement fields to nanometer dimensions through plasmonic nanostructures offers unprecedented opportunities for greatly enhanced interaction strength, increased bandwidth, lower power consumption, chip-scale fabrication, and efficient actuation of mechanical systems at the nanoscale. Conversely, coupling mechanical oscillators to plasmonic nanostructures introduces mechanical degrees of freedom to otherwise static plasmonic structures thus giving rise to the generation of extremely large resonance shifts even for minor position changes. This nanoscale marriage of plasmonics and mechanics has led to the emergence of a new field of study called plasmomechanics that explores the fundamental principles underneath the coupling between light and plasmomechanical nanoresonators. In this review, both the fundamental concepts and applications of plasmomechanics as an emerging field of study are discussed. After an overview of the basic principles of plasmomechanics, the active tuning mechanisms of plasmonic nano-mechanical systems are extensively analyzed. Moreover, the recent developments on the practical implications of plasmomechanic systems for such applications as biosensing and infrared detection are highlighted. Finally, an outlook on the implications of the plasmomechanical nanosystems for development of point-of-care diagnostic devices that can help early and rapid detection of fatal diseases are forwarded. 相似文献
10.
Simona Lengvinaite Juozas V. Grazulevicius Saulius Grigalevicius Vygintas Jankauskas 《Journal of Polymer Research》2011,18(4):731-737
9-Aryl[3,3′]bicarbazolyl derivatives containing reactive functional groups were synthesized by the multi-step synthetic rout.
The monomers were examined by various techniques including thermogravimetry, differential scanning calorimetry, UV and fluorescence
spectrometry as well as electron photoemission and time of flight techniques. The electron photoemission spectra of the layers
showed the ionisation potentials of 5.2–5.5 eV. Time-of-flight hole drift mobilities in amorphous layers of bisphenol Z polycarbonate
containing 50 wt. % of the electroactive materials exceed 10−5 cm2/Vs at high electric fields. 相似文献