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51.
Ritesh Dwivedi 《Numerical Heat Transfer, Part A: Applications》2019,75(1):56-70
A comprehensible theoretical formulation has been obtained after including the (a) nanofluid (water-Al2O3) as a working medium and (b) kinetic-theory based expressions for mass transport, to explore and explicate the characteristics of evaporating thin-film region in a microfluidic channel at uniform wall temperature with 2?°C of wall superheat. The model includes the expressions for heat transfer (as heat flux) and effective thermophysical properties of nanofluid. This study evaluates the effect of incorporation of nanofluid in details and results obtained shows an increment of 34% in total heat transfer for 2% volume fraction of nanoparticles. 相似文献
52.
Socrates D. Vamvakos Claude R. Gauthier Chethan Rao Alvin Wang Karthisha Ramoshan Canagasaby Khaldoon Abugharbieh Prashant Choudhary Sanjay Dabral Shaishav Desai Mahmudul Hassan K. C. Hsieh Bendik Kleveland Gurupada Mandal Richard Rouse Ritesh Saraf Jason Yeung Ying Cao 《Analog Integrated Circuits and Signal Processing》2014,78(2):259-273
This paper presents the design and Silicon verification of a 2.488–11.2 Gbps multi-standard SerDes transceiver in a 40 nm low-leakage CMOS process. The paper explores the architectural and circuit techniques used to meet the stringent requirements of the high-speed SerDes and to mitigate the performance impact of the low-leakage process. A system modeling approach is described, which is used for optimizing the architectural trade-offs. The transceiver makes use of a low-jitter LC phase locked loop to enable high-reliability system design. The design has 420 fs RJrms and consumes 30.1 mW/Gbps at 11.2 Gbps. 相似文献
53.
Protocol Independent Multicast-Sparse Mode is the most widely used multicast routing architecture. It builds a shared distribution tree centered at a rendezvous point and then builds source-specific trees for those sources whose data rate warrants it. Current implementations of the protocol decide on the rendezvous point administratively, which leads to congestion and delays. An attractive solution would be dynamic relocation of the rendezvous point depending on the members of the multicast group. In this paper we present a rendezvous point calculation and relocation mechanism for Protocol Independent Multicast-Sparse Mode. Simulation of the proposed mechanisms is used to demonstrate the effectiveness of the proposals. 相似文献
54.
By combining high-resolution transmission electron microscopy (HRTEM) characterization and electrical measurements on a unique device platform, we study the reversible electrically-driven phase-change characteristics of self-assembled Ge(2)Sb(2)Te(5) nanowires. Detailed HRTEM analyses are used to correlate and understand the effect of full and intermediate structural transformations on the measured electrical properties of the nanowire devices. The study demonstrates that our unique approach has the potential to provide new information regarding the dynamic structural and electrical states of phase-change materials at the nanoscale, which will aid the design of future phase-change memory devices. 相似文献
55.
56.
Zatta Robin Headland Daniel Ashna Eamal Jain Ritesh Hillger Philipp Grzyb Janusz Pfeiffer Ullrich R. 《Journal of Infrared, Millimeter and Terahertz Waves》2021,42(9-10):947-959
Journal of Infrared, Millimeter, and Terahertz Waves - Arrays of terahertz (THz) sources provide a pathway to overcoming the radiation power limitations of single sources. Several independent... 相似文献
57.
Ritesh Verma Ankush Chauhan Khalid Mujasam Batoo Rajesh Kumar Muhammad Hadi Emad H. Raslan 《Ceramics International》2021,47(11):15442-15457
We report the synthesis of Sr2+ doped Ba0.9-xCa0.1SrxTi0.8Zr0.2O3 nano-ceramics by the conventional solid-state reaction method. Phase formation of single-phase orthorhombic ABO3 type structure with space group P2mm was confirmed through X-ray diffraction (XRD). The crystallite size increased with increasing doping concentration from 25.46 nm to 52.96 nm as calculated by the Scherrer formula and from 47.1 nm to 88.5 nm by the Williamson-Hall method. The lattice parameter, dislocation density, and apparent density decreased with doping, except for when x = 0.05. The porosity was found to increase up to 16.8% with increasing doping. Field emission scanning electron microscopy (FESEM) shows that samples exhibit a flake-like structure. X-ray photoelectron spectroscopy (XPS) analysis confirms that Sr-ions occupy the Ca-site, for x = 0.05, and force the Ca ions to occupy the Ti-sites. For the higher concentration of Sr, i.e. x ≥ 0.15, no more forced substitution is observed and Sr-ions occupy the Ba-site only, which decreases oxygen vacancies. Diffused rings observed in selective area electron diffraction (SAED) patterns indicate the high crystalline order of the samples. The Fourier-transformed infrared spectroscopy (FTIR) measurements show a single broad peak between 544 and 594 cm?1 for all the compositions, while two prominent peaks are observed for the composition x = 0.05 at 528 cm?1 and 592 cm?1. The Raman spectra show a shift in the most prominent peak, observed approximately 517 cm?1. 相似文献
58.
An investigation of molybdenum surface reinforcement on the hardness and wear properties of AISI 630
P. Ritesh 《金属精饰学会汇刊》2018,96(2):95-102
AISI 630 stainless steel (SS) surface has been reinforced with molybdenum (Mo) using gas tungsten arc (GTA) as a heat source. The optimum GTA heat source conditions have been finalised based on the proper fusion of base metal. The microhardness of the Mo-reinforced AISI 630 SS was found to be 502?HV which shows an improvement of 35% with respect to the base metal (371?HV). To improve the properties, the reinforced alloy was heat treated. The microhardness of the reinforced and aged AISI 630 was 725?HV, which was higher than the base metal by 95%. Dry sliding wear tests using a Pin-on-Disc machine were performed and it was found that the wear resistance of the reinforced surface was improved by 52% with respect to base metal. Characterisation techniques such as optical microscopy, scanning electron microscope, energy-dispersive X-ray spectrometry and XRD were used to establish morphology, structure and composition, and the presence of Mo was confirmed. 相似文献
59.
Dinesh Kumar Sanjay Singh Ritesh Sharma Vishavjit Kumar Harish Chandra Kshitij Malhotra 《Biomass & bioenergy》2011,35(9):3891-3895
Cuttings of 1–3 cm diameter and 45 cm length were collected during the first week of February from branches of previous year’s growth in a mature plantation of Jatropha curcas. The cuttings, without application of any growth regulator, were planted in nursery beds having loam: gravel (1:1 v/v) mixture rooting media. The nursery beds existed inside a polyethylene tunnel where intermittent misting was done. When sprouting percentage had stabilised, sprouted cuttings were removed from the media, and root and shoot characteristics of the cuttings were recorded. The number of roots and root length were found to be significantly correlated (P < 0.01) with one another as well as with sprout length, number of sprouts and number of leaves. The following equations were fitted for prediction of root characteristics of a cutting from of its above-ground characteristics: (i) No. of roots = −0.409 + 0.452 (no. of leaves) + 0.395 (sprout length), and (ii) Root length = 2.656 + 0.206 (no. of leaves) + 0.270 (sprout length); the sprout length and root length are in centimetres in both equations. Thicker cuttings possessed better root and above-ground characteristics. 相似文献
60.
A first-order theory is presented for the calculation of the effects of compositional variation on the transport properties of glass melts. The theory is based upon the modified Enskog theory applied to the high-temperature expansion of the free energy. The theory is applied to a simple two-component glass system and compared to experimental and previous theoretical results. 相似文献