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排序方式: 共有167条查询结果,搜索用时 9 毫秒
81.
Savas Kaya Hesham F. A. Hamed Anish Kulkarni 《Analog Integrated Circuits and Signal Processing》2010,62(2):215-222
A novel tunable current-mode integrator for low-voltage low-power applications is presented using mixed-mode TCAD simulations. The design is based on independently driven double-gate (IDDG) MOSFETs, a nano-scale four-terminal device, where one gate can be used to change the characteristics of the other. Using current-mirrors built with IDDG-MOSFETs, we show that the number of active devices in the tunable current-mode integrator, 16 in bulk CMOS design, may be halved, i.e. considerable savings in both total area and power dissipation. The integrator operates with single supply voltage of 1 V and a wide range of tunable bandwidth (~2 decades) and gain (~30 dB). This linear circuit has third-order harmonic distortion as low as ?70 dB in appropriate bias conditions, which can be set via the back-gates. The impact of tuning on the IDDG integrator and conventional design using symmetrically driven (SDDG) MOSFETs is comparatively studied. The proposed design is a good example for performance leverage through IDDG MOSFET architectures in analog circuits integral to future mixed-signal systems. 相似文献
82.
Aftab Aslam Parwaz Khan Abdullah M. Asiri Anish Khan Naved Azum Malik Abdul Rub Mohammed M. Rahman Sher Bahadar Khan K.S. Siddiqi Khalid A. Alamry 《Journal of Industrial and Engineering Chemistry》2013,19(2):595-600
The reactions of Cefuroxime (CFA) by hexacyanoferrate (III) (HCF(III)) in alkaline medium at a constant ionic strength has been studied spectrophotometrically. It is a first order reaction, but fractional order in both CFA and alkali. Decrease in dielectric constant of the medium decreases the rate of reaction. The effect of added products and ionic strength has also been investigated. A mechanism involving free radicals is proposed. In a composite equilibrium step, CFA binds to HCF(III) to form a complex that subsequently decomposes to the products. The main two products were separated and identified by column chromatography, TLC and FT-IR. There is good agreement between the observed and calculated rate constants under different experimental conditions. The reaction was studied at different temperatures and activation parameters were computed with respect to the slow step of the proposed mechanism. 相似文献
83.
The aim of the present study was to investigate the effect of sandalwood seed oil on fatty acid (FA) profiles and inflammatory factors in rats. Fifty male Sprague–Dawley rats were randomly divided into five different dietary groups: 10 % soybean oil (SO), 10 % olive oil (OO), 10 % safflower oil (SFO), 10 % linseed oil (LSO) and 8 % sandalwood seed oil blended with 2 % SO (SWSO) for 8 weeks. The SWSO group had a higher total n-3 polyunsaturated fatty acids (PUFA) levels but lower n-6:n-3 PUFA ratios in both adipose tissue and liver than those in the SO, OO and SFO groups (p < 0.05). Although the SWSO group had a much lower 18:3n-3 level (4.51 %) in their dietary lipids than the LSO group (58.88 %), the levels of docosahexaenoic acid (DHA: 22:6n-3) in liver lipids and phospholipids of the SWSO group (7.52 and 11.77 %) were comparable to those of the LSO group (7.07 and 13.16 %). Ximenynic acid, a predominant acetylenic FA in sandalwood seed oil, was found to be highly incorporated into adipose tissue (13.73 %), but relatively lower in liver (0.51 %) in the SWSO group. The levels of prostaglandin F2α, prostaglandin E2, thromboxane B2, leukotriene B4, tumor necrosis factor-α and interleukin-1β in both liver and plasma were positively correlated with the n-6:n-3 ratios, suggesting that increased n-6 PUFA appear to increase the formation of pro-inflammatory cytokines, whereas n-3 PUFA exhibit anti-inflammatory activity. The present results suggest that sandalwood seed oil could increase tissue levels of n-3 PUFA, DHA and reduce the n-6:n-3 ratio, and may increase the anti-inflammatory activity in rats. 相似文献
84.
Topias Jussila Anish Philip Johan Lindén Maarit Karppinen 《Advanced Engineering Materials》2023,25(2):2201262
The critical-element-free ε-Fe2O3 ferrimagnet exhibits giant magnetic coercivity even at room temperature. It is thus highly attractive material for advanced applications in fields such as spintronics, high-density data storage, and wireless communication. However, a serious obstacle to overcome is the notoriously challenging synthesis of ε-Fe2O3 due to its metastable nature. Atomic layer deposition (ALD) is the state-of-the-art thin-film technology in microelectronics. Herein, it is demonstrated that it has also true potential for the fabrication of amazingly stable in situ crystalline and high-performance ε-Fe2O3 thin films from simple (FeCl3 and H2O) chemical precursors at a moderately low deposition temperature (280 °C). Standard X-ray diffraction and Fourier transfer infrared spectroscopy characterization indicates that the films are of high level of phase purity. Most importantly, precise temperature-dependent 57Fe Mössbauer spectroscopy measurements verify that the hematite (α-Fe2O3) trace in the films is below 2.5%, and reveal the characteristic low- and high-temperature transitions at 208–228 K and ≈480 K, respectively, while magnetization measurements confirm the symmetric hysteresis loops expected for essentially phase-pure ε-Fe2O3 films. Excitingly, the highly c-axis oriented film growth, the overall film quality, and the unique magnetic properties remain the same, independently of the substrate material used. 相似文献
85.
Anish Khan Aftab Aslam Parwaz Khan Abdullah M. Asiri Samia A. Kosa 《Polymer-Plastics Technology and Engineering》2015,54(15):1615-1624
A new class of PANI/Sn(II)SiO3/FCNTs nanocomposite was synthesized by mixing polyaniline into the gel of Sn(II)SiO3 followed by FCNTs (Polyaniline/Sn(II)SiO3/Functionalized Carbon nanotubes). The physico-chemical characterization was carried out by scanning electron microscope, XRD (X-ray Diffraction), FTIR (Fourier Transform Infrared Spectroscopy), ultraviolet–visible spectroscopy, and simultaneous thermogravimetric analysis studies. The ion-exchange capacity (1.2 meq/g) and distribution studies were also determined to understand the ion-exchange capabilities. The DC electrical conductivity studies revile it in the range of 3–5 × 10?3 S/cm. On the basis of distribution studies, ion-selective membrane electrode was designed for Hg(II). The analytical utility of this membrane was established by using it as an indicator electrode in electrometric titrations. 相似文献
86.
Anish Khan Aftab A.P. Khan Abdullah M. Asiri Khalid A. Alamry 《Polymer Composites》2015,36(2):221-228
Graphene oxides decorated with Sn(II) (Sn‐GO) were prepared via a redox reaction between graphene oxide (GO) and SnCl2. GO was reacted Sn2+ leading to a homogeneous distribution of Sn on GO. An electrochemical sensor based on the electrocatalytic activity of functionalized graphene oxide for sensitive detection of paracetamol is presented. The electrochemical behaviors of paracetamol on grapheme modified carbon fiber electrodes were investigated by DC potential amperometry. The results showed that the Sn‐GO‐modified electrode exhibited excellent electrocatalytic activity to paracetamol. A redox process of paracetamol at the modified electrode was obtained. Such electrocatalytic behavior of graphene oxide is attributed to its unique physical and chemical properties, e.g., subtle electronic characteristics, attractive π–π interaction, and strong adsorptive capability. This electrochemical sensor shows an excellent performance for detecting paracetamol with a detection limit of 8 µM, a response time of 27 s, and a satisfied recovery. The sensor shows great promise for simple, sensitive, and quantitative detection and screening of paracetamol. We have investigated the composite properties of the self‐assembled electrodes for biological compounds analysis and showed that the Sn‐GO composite biosensor can achieve great sensitivity without significant bio material. The sensor shows great promise for simple, sensitive, and quantitative detection and screening of paracetamol. POLYM. COMPOS., 36:221–228, 2015. © 2014 Society of Plastics Engineers 相似文献
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89.
ABSTRACT The main aim of this study is to analyse and understand the heat transfer in closed spaces between the main vessel and the safety vessel in a nuclear reactor by using Nitrogen and Argon gas as an insulator. For nuclear reactor cooling, researchers started moving from the hard water method to various other methods of dissipating the heat. In this study, we used a closed cube filled with nitrogen as a prototype model. Within the closed cube, a very thin pipe is used to carry the nitrogen gas and Argon gas, whose effectiveness will be measured in the study. This study is conducted into three parts, with the main thing being creating a proto-model to conduct the experiment. 相似文献
90.
Malik Abdul Rub Abdullah M. Asiri Dileep Kumar Anish Khan Aftab Aslam Parwaz Khan Naved Azum Kabir-ud-Din 《Journal of surfactants and detergents》2012,15(6):765-775
The effect of various organic additives, viz. sugars, ureas, alcohols, hydrotropes and bile salts on the clouding (phase separation) phenomenon of the amphiphilic antidepressant drug amitriptyline hydrochloride was investigated in the present study. All sugars lowered the cloud point (CP) due to their water structure-making property. Urea and alkylureas were found to lower the CP. In contrast, thioureas increased the CP slightly, but the presence of methyl group(s) had a similar effect in alkylureas. Short chain alcohols affected the CP insignificantly while higher ones decreased it, and medium chain alcohols showed peak behavior. Addition of hydrotropes and bile salts increased the CP at lower concentrations, while a decrease was observed at higher concentrations (like the medium chain alcohols). In addition, thermodynamic parameters were also evaluated but only for those additives which formed mixed micelles with the drug. 相似文献