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11.
A new processing scheme has been developed for the preparation of core-shell structured composite particles that can be used
as building blocks for the fabrication of nanocomposites [1]. The scheme is a two stage coating process utilizing controlled
polymer adsorption and bridging in which a layer of nano sized particles is bridged onto submicron sized core particles. The
coating process is monitored using electrokinetic techniques as well as SEM. The controlled coating process was used also
to prepare multilayer nanocomposites. The application of the coating process to concentrated suspensions (15 volume percent)
required in ceramic processing was shown to be feasible. Ceramic compacts were successfully prepared using pressure filtration
methods and tested for their green density and flexibility.
Received: 18 October 1998/Revised and accepted: 1 December 1998 相似文献
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A reusable capacitive immunosensor with a novel immobilization procedure based on 1,6-hexanedithiol and nano-Au self-assembled layers 总被引:2,自引:0,他引:2
A novel immobilization procedure of antibody proteins for capacitive immunosensing, based on thiolor sulfur compound (1,6-hexanedithiol, HDT) and colloid Au layers is proposed. The insulating organic monolayer film was first formed by the spontaneous assembly of HDT from solution onto gold. When these thiol-rich surfaces are exposed to Au colloid, the sulfurs form strong bonds to gold nanoparticles, anchoring the clusters to the electrode substrate. After the assembly of gold nanoparticles layer, the original formed organic thiols surface was restored, and a new nano-Au surface was obtained. Thus, the antibody could be immobilized through electrostatic adsorption between nano-Au and the antibody proteins. After use, the formed immunocomplex layer can be rinsed out, via a saline solution with extreme pH. Therefore, the immunosensor can be regenerated repeatedly, highlighting a clear advantage of this new approach with respect to classical immunoassays employing covalent immobilization. 相似文献
15.
Mikkelsen LH 《Water research》2003,37(10):2458-2466
Surface charge quantification of polymer solutions and sludge suspensions were investigated by the colloid titration technique and compared to charge densities obtained by pH-titration. The colloid titration technique worked well for polymer samples. The charge quantity of humic acid and activated sludge extracellular polymers (EPS) was estimated to be -1.51 and -0.42 meq/g, respectively. These values are reasonable when compared to pH-titration results. The surface charge of activated sludge particles appears to be below the limit of detection. However, surface charge estimates are obtained, when the reactant doses and sample concentration are increased. It is suggested that such estimates are not correct, but artefacts of the non-stoichiometric precipitation of the polymeric reactants at high doses. It appears that the colloid titration method is limited to conditions of low reactant doses and valid for charge determination of extracted sludge polymers, whereas the method is not valid for charge determination of whole sludge. 相似文献
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V.V. MAHAJANI 《Chemical Engineering Communications》2013,200(1-6):335-338
Supersaturation criteria has been developed for gas absorption accompanied by chemical reaction resulting in the formation of two volatile products. 相似文献
18.
Dennis J. O’Brien Gerard E. Senske 《Journal of the American Oil Chemists' Society》1994,71(9):947-950
Utilization of lipids containing eicosapentaenoic acid (EPA) produced by microorganisms requires processes for their efficient
recovery from microbial cells. Recovery of EPA from mycelia of the fungusPythium irregulare by solvent extraction with hexane-isopropanol (HIP) in a pilot-plant colloid mill was investigated. Extraction efficiencies
of 96% for lipid and EPA were achieved with a 3∶2 (vol/vol) HIP mixture by milling wet, filtered mycelia for 5 min at a solvent/dry
solids ratio of 100 L/kg. The process yielded a crude extract that contained up to 96% lipid and an EPA content as high as
24% (with no selectivity for EPA). 相似文献
19.
溶胶—凝胶法制备掺入金胶粒的非线性光学凝胶玻璃 总被引:2,自引:0,他引:2
以柠檬酸酸钠还原氯金(Ⅲ)酸,得到金的胶体溶液。以正硅酸甲酯为先驱体,经溶胶-凝胶法,使金胶粒均匀地分布到二氧化硅凝胶中,制出了具有一定机械强度的凝胶玻璃片,并对其进行了透光率及三阶非线性性质的研究。结果表明其三阶非线性极化率X^(3)在10^-12esu数量级。 相似文献
20.
Transport and retention of a bacteriophage and microspheres in saturated, angular porous media: effects of ionic strength and grain size 总被引:2,自引:0,他引:2
Eight saturated column experiments were conducted to examine the effects of solution chemistry and grain size on the transport of colloids through crushed silica sand. Two sizes of colloids, 0.025-μm bacteriophage (MS-2) and 1.5-μm carboxylated microspheres, were used as surrogates for the transport of pathogenic viruses and bacteria, respectively. Increasing the Ca2+ concentration from 1 to 4.8 mM (along with background monovalent ions) resulted in complete attenuation (>6-log decrease in C/C0) of MS-2, but caused only a 1-log reduction (C/C0 = 0.1) in the concentration of the microspheres. Decreasing grain size from medium sand (d50 = 0.70 mm) to fine sand (d50 = 0.34 mm) resulted in substantial decreases in effluent concentrations of both the MS-2 (5-log decrease) and microspheres (>2.5-log decrease). Comparison of observed colloid retention to that predicted by a recently published correlation equation for colloid filtration revealed that the model can considerably underpredict (by 4 orders of magnitude or more) colloid retention by angular sand over distances as short as 20 cm. This indicates that state-of-the-art colloid filtration models are still limited in applicability to natural systems. 相似文献