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1.
Osasere Faraday F. Orumwense 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1994,60(4):405-411
Dispersion–flocculation studies on a Goethite–clay system using flocculants were carried out as a function of flocculant concentrations, pH of slurry, time of agitation and dispersant dosage. Also, the effects of pH and polymer concentrations on the adsorption behaviour of the system were investigated. Results show that well flocculated goethite was preferentially obtained from 4% goethite/kaolinite clay suspensions, with 50 ppm causticised starch in the slurry at pH values of 3–11·5 and with 50 ppm polyacrylamide at pH values of 3–8. Good flocs were also obtained on flocculation of the goethite suspension with 50 ppm polyacrylamide at pH values of 5–7, while the kaolinite suspension did not respond to the same dosage of causticised starch in the same pH range. Results further reveal that for the goethite/kaolinite suspension, the best results was obtained with 50 ppm polyacrylamide at pH values of 7–10. Based on the data generated in the study, it was concluded that causticised starch is a better flocculant than polyacrylamide for goethite suspensions although polyacrylamide is an excellent flocculant for kaolinite suspensions. 相似文献
2.
对红细胞进行精确的分割并统计各类参数在临床医学中有着重要的意义,但现有经典算法很难实现自动分割并获得较高准确率。红细胞的分割主要有两个难点:一是红细胞的目标提取;二是重叠红细胞的分割。本文首先利用SVM对原始图像进行红细胞提取,把原始细胞分割成红细胞和背景两类目标区域,然后对红细胞区域进行重叠分割(本文中使用改进距离标记的分水岭算法),最终得到各个红细胞的统计数据。为获得最佳的分割效果,本文通过实验对核函数、支持向量类型及相关参数进行了详细的比较和分析。实验结果表明,该算法能有效、快捷、准确、全自动的实现 相似文献
3.
应用显微图象分析系统,研究了水中NaCl、CaCl2、Fe^2+等对黏土颗粒粒径中值的影响。结果表明:随着体系中离子浓度的增加,颗粒粒径中值增大。当体系中黏土颗粒浓度为100mg/l时,NaCl浓度为40000mg/l时的颗粒长轴粒径中值为13.70μm,短轴粒径中值为10.06μm;CaCl2浓度为5000mg/l时的颗粒长轴粒径中值为12.17μm,短轴粒径中值为7.76μm;Fe^2+浓度为100mg/l时的颗粒长轴粒径中值为12.53μm,短轴粒径中值为10.25μm。NaCl、CaCl2浓度分别为40000mg/l和5000mg/l、Fe^2+浓度为30mg/l时,颗粒长轴中值为14.95μm,短轴中值为11.94μm。当水中NaCl、CaCl2、Fe^2+浓度分别为40000mg/l、5000mg/l和100mg/l时,加入H2O2,颗粒长轴中值增加到22.44μm,短轴中值增加到14.54μm。 相似文献
4.
This work presents a framework for future studies to better understand the appropriate time to include chemical inhibitors at different stages of asphaltene aggregation in the oil. For this purpose, molecular dynamics (MD) simulations were performed to study the aggregation of asphaltene molecules in heptane, in terms of strength, dynamics, and the occurrence time of each stage of aggregation from single molecules to a large flocculate. Results indicate that the nucleation of nanoaggregates begins prior to 10?ns, clusters start forming at 98?ns, and flocculation happens after 120?ns. It was also observed that the final flocculate had a globular shape. 相似文献
5.
Waste rolling oil (WRO) can be regenerated by inorganic flocculation-adsorption. Ferric hydroxide (Fe(OH)3) colloid prepared by the double decomposition reaction of FeCl3 and NaOH was selected as an inorganic flocculant. Fly ash, activated carbon, clay and silica gel were used as adsorbents to treat the WRO. Effects of different treatment conditions on the performance of the recycled oil were investigated. Results indicated that the recycled oil achieved optimum quality under the following conditions: flocculation time, 6?min; temperature, 60?°C; adsorption time, 20?min; and mass ratios of FeCl3-to-WRO, NaOH-to-FeCl3 and fly ash-to-WRO of 0.10, 3 and 0.03, respectively. NaOH combined with Fe(OH)3 effectively removed most macromolecular impurities, organic acids, lipids, and alcohols. Fly ash exerted the best adsorption rate and adsorption effect. In addition, physicochemical properties of the recycled oils were close to those of fresh oil. 相似文献
6.
Flocculation of Whey Protein Stabilized Emulsions as Influenced by Dextran Sulfate and Electrolyte 总被引:1,自引:0,他引:1
The creaming stability and viscosity of oil-in-water emulsions stabilized by whey protein isolate were monitored as functions of dextran sulfate (DS) and electrolyte (NaCl) concentration. At a specific DS concentration (the critical flocculation concentration, CFC), the droplets became flocculated, which promoted creaming. Addition of electrolyte caused an increase in CFC. At NaCl concentrations <0.5 wt%, addition of electrolyte decreased emulsion viscosity, but at concentrations >0.5 wt% it caused an increase in viscosity due to increased flocculation. The results were due to the influence of electrostatic screening on the effective volume of DS molecules and colloidal interactions between droplets. 相似文献
7.
8.
D. M. Heyes 《Lubrication Science》1994,6(4):327-335
In this paper is described the role of molecular simulation as a useful quasi-‘experimental’ tool to help in understanding the interplay between molecular structure under shear flow and the manifested tribology/rheology. The development of non-equilibrium molecular simulation techniques are discussed, from the molecular dynamics approach through to the modelling of dispersions by brownian dynamics. Recent advances and extensions of the technique to weakly flocculated systems, such as electro-rheological fluids, are described. 相似文献
9.
10.
聚半乳甘露糖(galactomannan,GM)是一种异质多聚糖半纤维素,与纤维素结构类似,能快速吸附到纤维素表面,同时吸附细小纤维、胶体糖类物质以及矿物填料,是一种高性能的造纸湿部化学助剂。本研究利用废液浊度研究了GM对细小纤维和填料的吸附特性以及抗离子干扰的影响。结果表明,相比于阳离子淀粉(CS)添加剂,即使添加量较少,如0.3%-0.5%,GM对细小纤维和矿物填料都有较强的吸附作用,吸附稳定性好;甚至在离子富集的白水系统中,GM对离子干扰不敏感,而CS却极易受到离子垃圾的影响,从而导致两者的增强效果差别很大。造成这种现象的原因除氢键作用外,还与分子链结构构型产生的范德华力有关。由于GM分子链具有顺式结构,具有较强偶极矩叠加诱导力,导致GM大分子有较强的极性,即使系统污染较大,干扰因素较多,但对GM大分子的吸附力影响却有限。因此,相比CS等湿部聚合物添加剂,由于GM具有较高的吸附絮凝特性,将会较大幅度降低COD,有利于高速纸机的白水封闭循环系统。 相似文献