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1.
2.
Solid solution series, (Bi2O3)1−x (Y2O3)x and (Bi2O3)1−x (Gd2O3)x, forx = 0.10, 0.20, 0.30 and 0.40 were synthesized by standard ceramic technique. The structural phase characterization was carried
out using X-ray powder diffraction technique. It was found that the solid solution containing 20–40 mole% of Y2O3 had face-centred cubic structure. All samples of the solid solution series, (Bi2O3)1−x (Gd2O3)x, had rhombohedral single phase in the concentration range 0.10 ≤x ≤ 0.40. Lattice parameters offcc phase of Y2O3 doped samples were calculated from the X-ray diffraction data. The lattice constant ‘a’ gradually decreases with increasing content of dopant concentration (x) for the Y2O3 doped system and obeys Vegard’s rule. The unit cell parameters for the (Bi2O3)1−x (Gd2O3)x doped samples showing rhombohedral phase were obtained on hexagonal setting. 相似文献
3.
In lithium-ion batteries, several electrical and physical parameters are responsible for the degradation of the electrode materials. Here the application of Kelvin probe microscopy (KPM) is demonstrated to measure the charge sustaining capability of the LiFePO4 cathode under aged and unaged conditions. The aged sample shows lower surface potential than the unaged sample, which can be attributed to changes in physical and chemical properties including particle size, phase of the surface layer and nanocrystalline deposits. 相似文献
4.
We consider a static, single operation, non-pre-emptive, deterministic scheduling problem in which a set of n jobs is to be processed on k identical machines. Jobs assigned to each machine have a common due date. The number of machines (k) is unknown. Activating a machine will require additional costs to be incurred. The objective is to find an optimal sequence, the optimal number of machines (k), and the respective due dates to minimize the weighted sum of earliness, tardiness, and machine activation costs. We propose a polynomial time algorithm to solve the problem. 相似文献
5.
D. Bruce Masson Shrikant S. Pradhan 《Metallurgical and Materials Transactions B》1973,4(10):2484-2485
6.
A single-shot method for measurement of nonlinear optical absorption and refraction is described and analyzed. A spatial intensity variation of an elliptical Gaussian beam in conjugation with an array detector is the key element of this method. The advantages of this single-shot technique were demonstrated by measuring the two-photon absorption and free-carrier absorption in GaAs as well as the nonlinear refractive index of CS2 using a modified optical Kerr setup. 相似文献
7.
Divyanka Shrikant Bodas 《Drug development and industrial pharmacy》2013,39(7):1193-1204
Budesonide is a BCS class II drug with low water solubility (0.045?mg/mL) and low oral bioavailability (6–8%) due to high first pass effect. The aim is to prepare cross-linked chitosan–dextran sulfate nanoparticles and/or nanodispersion. Nebulizable cross-linked nanodispersion was prepared by the solvent evaporation technique and characterized through XRPD, FTIR, mean particle size (MPS), polydispersity index (PDI), zeta potential (ZP), drug loading, entrapment efficiency, SEM, % production yield, in vitro diffusion, aerodynamic and stability study. The optimization of formulation was done by using central composite rotatable design to study the effect of independent variables, concentration of chitosan (X1) and concentration dextran sulfate (X2) on the dependent variables, MPS (Y1), drug loading (Y2) and % CDR (% cumulative drug release) (Y3). The MPS, PDI, and ZP of budesonide-loaded nanoparticles were 160.8?±?0.27?nm, 0.36?±?0.04, and 13?±?0.894?mV, respectively. The percent drug loading of all the batches was found in range of 10–16%. The emitted drug in target region (alveoli) was measured by using HPLC and it was found to be 18.26%. It was found that, nanodispersion had the optimum in vitro aerodynamic behavior. Stability study results showed no significant change in MPS, PDI, ZP, and % CDR after three month storage. In conclusion, cross-linked chitosan–dextran sulfate nanoparticles had properties suitable for nebulizable dispersion of increased drug loading, in vitro drug release and avoiding the first pass effect. 相似文献
8.
Subrahmanya Shreepathi Akshay Kumar Guin Shrikant M. Naik Mohan Rao Vattipalli 《Journal of Coatings Technology and Research》2011,8(2):191-200
Electrochemical impedance spectroscopy (EIS) is used to derive an expression for predicting the service life of organic coating
in a C4-type environment (industrial and costal areas with moderate salinity) as defined in ISO 12944 standard for paints
and varnishes—corrosion protection of steel structures by protective paint systems. Three coating systems with a record of
2, 5, and 10 years of durability were selected for the study. The selection was also based on proven composition and dry film
thickness (DFT) of the coatings as per ISO 12944. Electrochemical impedance measurements of the paint-coated panels were carried
out by exposing the coated mild steel panels without scribe in different corrosive environments such as immersion in NaCl
solution, neutral salt spray, etc. Neutral salt spray exposure was found to be the most severe corrosive environment among
all the three coating systems. In most of the cases, EIS gave early indication of coating failure when compared to visual
defects such as blistering and over-film corrosion. 相似文献
9.
Organic polymers exhibit poor thermal stability and inferior mechanical properties. Significant improvement in mechanical and thermal properties of polymers can be achieved by homogeneous distribution of inorganic materials preferably in nano size. In this study, these properties of polyvinyl alcohol were found to improve by addition of nano-titanium dioxide. Microwave irradiation method was used to prepare nano-titanium dioxide and doped in polyvinyl alcohol matrix to formulate the composite film. The spectral and morphological characterizations of the composites were carried out by the conventional techniques. Various mechanical properties were determined by Tinus Oisen universal testing machine. Thermal gravimetric analysis and differential scanning calorimetry were used for studying the thermal properties of the composites. Shift in decomposition temperature of polyvinyl alcohol indicated the enhanced thermal stability of polyvinyl alcohol. The composite also exhibited significant improvement in all the mechanical properties. 相似文献
10.
Sudharshan Phani Pardhasaradhi Vishnukanthan Venkatachalapathy Shrikant V Joshi Sundararajan Govindan 《Journal of Thermal Spray Technology》2008,17(4):551-563
Cold gas dynamic spraying (CGDS), a relatively new thermal spraying technique has drawn a lot of attention due to its inherent
capability to deposit a wide range of materials at relatively low-operating temperatures. A De Laval nozzle, used to accelerate
the powder particles, is the key component of the coating equipment. Knowledge concerning the nozzle design and effect of
process parameters is essential to understand the coating process and to enable selection of appropriate parameters for enhanced
coating properties. The present work employs a one-dimensional isentropic gas flow model in conjunction with a particle acceleration
model to calculate particle velocities. A laser illumination-based optical diagnostic system is used for validation studies
to determine the particle velocity at the nozzle exit for a wide range of process and feedstock parameters such as stagnation
temperature, stagnation pressure, powder feed rate, particle size and density. The relative influence of process and feedstock
parameters on particle velocity is presented in this work. 相似文献