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排序方式: 共有284条查询结果,搜索用时 15 毫秒
1.
YOUSSEF S. HAFEZ ALI I. MOHAMED GURBAX SINGH FAWZY M. HEWEDY 《Journal of food science》1985,50(5):1271-1274
Two hundred grams of soybean seeds (moisture contents of 7.4, 15.3, 22.5, and 30.5%) were irradiated at dose levels of 0, 1, 5, 10, 20, 40, 60, 80 and 100 KGy using Cobalt-60 source. Radiation dose of 100 KGy caused a decrease in the percentage of nitrogen solubility from 80.3 to 67.2, 80.3 to 57.8, and 68.1 to 48.8 when deionized H2O, 0.6M NaCl, and 0.2M Cacl2 were used as solvents, respectively. Inhibition of 71% of lipoxygenase activities, 25.4% trypsin inhibitor activities, and 16.7% chymotrypsin inhibitor activities were found when the soybean seeds were irradiated at 100 KGy. 相似文献
2.
SIAVASH IMANIAN GHAZANLOU ALI SHOKUHFAR SHIVA NAVAZANI REZVAN YAVARI 《Bulletin of Materials Science》2016,39(5):1185-1195
Ni–Co/SiO 2 nanocomposite coatings and Ni–Co alloy coatings were prepared on steel substrate using direct and pulse electrodeposition methods. X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), X-ray map and energy dispersive X-ray spectroscopy (EDX) were employed to investigate the phase structure, surface morphology, and elemental analysis of coatings, respectively. In high discharge rates, the surface morphology was rough, disordered and gross globular; on the contrary, in the low rates, it was smoother, more ordered and fine globular. Also, effect of electrodeposition parameters such as average current density, pulse frequency and duty cycle on the microhardness and grain size of nanocomposite coatings that produced through the pulse current electrodeposition method have been investigated. By amplifying both duty cycles up to 50% and average current density from 2 to 6 A dm?2, microhardness increased, while the grain size decreased. But when duty cycle mounted on more than 50% and the average current density went up to 8 A dm?2, microhardness lessened, while the grain size rose. The optimum value for pulse frequency was about 25 Hz. Results showed that microhardness of nanocomposite coatings which were produced by pulse current method was higher than that of produced by direct current method. 相似文献
3.
In this study, NIMROD simulations are performed to investigate the effects of massive helium gas injection level on the induced disruption on EAST tokamak. It is demonstrated in simulations that two different scenarios of plasma cooling(complete cooling and partial cooling) take place for different amounts of injected impurities. For the impurity injection above a critical level, a single MHD activity is able to induce a complete core temperature collapse. For impurity injection below the critical level, a series of multiple minor disruptions occur before the complete thermal quench. 相似文献
4.
ALI FELIACHI 《International journal of control》2013,86(6):1499-1505
An algorithm for the evaluation of the fixed modes of interconnected large-scale systems with respect to decentralized feedback gains is presented, as well as a procedure for the determination of decentralized stabilization and/or pole-placement feedback gains. The approach is based on eigenvalue dynamics, and closed-form expressions for eigenvalue sensitivities with respect to the decentralized feedback gains are obtained. 相似文献
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6.
ALI FELIACHI 《International journal of systems science》2013,44(6):979-984
A novel procedure is presented to design a linear constant state feedback controller with a prespecified performance measure. The method is an iterative technique based on the sensitivity of a quadratic cost functional with respect to the feedback gains. At each iteration, a Riccati-type algebraic matrix equation is solved to compute the sensitivity expressions needed to update the feedback gains. 相似文献
7.
Reachability conditions are developed for discrete single-input-single-output variable structure control systems described by linear mathematical models in general state-space form to reach a switching function from anywhere in state space. Stability conditions of a sliding mode are investigated. A modified algorithm is proposed to simplify the design procedure. Practical application to a thermal process has been achieved by using the modified algorithm to show the potential for development and practical results are compared with those using the classical PID controller design. 相似文献
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9.
ALI R. TAHERIAN PATRICK FUSTIER HOSAHALLI S. RAMASWAMY 《Journal of food process engineering》2007,30(2):204-224
Stability of beverage emulsion is measured by the rate at which the emulsion creams, flocculates or coalesces, and is generally dependent on rheology of water phase, difference in specific gravities of the two phases and droplet size/distribution of the emulsion. The effects of weighting agents (sucrose acetate isobutyrate and brominated vegetable oil) and xanthan gum on modified starch‐based emulsions were evaluated in this study. Emulsion was formed by addition of 9% coconut oil, in the presence or absence of weighting agents, into the water phase containing modified starch at 10, 12 or 14% without or with the addition of 0.3% xanthan gum. Stabilities of emulsions were evaluated both in the concentrated form used for storage and dilute form used in beverages. The addition of xanthan gum into the water phase decreased the flow behavior index (n) from 0.88 down to 0.31 and increased elastic modulus (G′) over 20 times at elevated frequency (ω = 50 rad/s) and elevated the stability of the emulsion. The xanthan gum‐added emulsion had smaller particle size and demonstrated 14 and 5 times slower phase separation compared to the emulsions without or with the addition of weighting agents, respectively. When the elastic modulus was larger than the viscous modulus (G′ > G″), the emulsions demonstrated greater stability. In dilute beverage solutions, creaming was observed in the absence of xanthan gum. 相似文献
10.
Focal adhesions are polyproteins linked to extracellular matrix and cytoskeleton, which play an important rolein the process of transforming force signals into intracellular chemical signals and subsequently triggering relatedphysiological or pathological reactions. The cytoskeleton is a network of protein fibers in the cytoplasm, which iscomposed of microfilaments, microtubules, intermediate filaments, and cross-linked proteins. It is a very importantstructure for cells to maintain their basic morphology. This review summarizes the process of fluid shear stresstransduction mediated by focal adhesion and the key role of the cytoskeleton in this process, which focuses on thefocal adhesion and cytoskeleton systems. The important proteins involved in signal transduction in focal adhesion areintroduced emphatically. The relationship between focal adhesion and mechanical transduction pathways arediscussed. In this review, we discuss the relationship between fluid shear stress and associated diseases such asatherosclerosis, as well as its role in clinical research and drug development. 相似文献