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21.
孔隙阻力因子法评价胶态分散凝胶 总被引:20,自引:9,他引:11
本文介绍了一种类似岩心流动装置的填砂滤管实验装置,在该装置上参照测定转变压力的实验方法测定胶态分解凝胶的孔隙阻力因子Fpr,作为表征凝胶相对强度的新参数。测得的孔隙阻力因子值与转变压力值,TGU值之间有良好的线性相关性,以孔隙阻力因子对时间作图可以求得成胶时间。 相似文献
22.
有机锆交联剂OZ—1应用研究 总被引:5,自引:0,他引:5
合成了具有延迟交联特性的有机锆交联剂OZ1;介绍了OZ1交联的已在胜利油田应用的3种压裂液的性能;探讨了OZ1在水基聚合物冻胶堵剂和弱凝胶或胶态分散凝胶中的应用。 相似文献
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Guillermo Niño-Medina Elizabeth Carvajal-Millán Jaime Lizardi Agustín Rascon-Chu Jorge A. Marquez-Escalante Alfonso Gardea Ana L. Martinez-Lopez Victor Guerrero 《Food chemistry》2009
Water-soluble feruloylated arabinoxylans were extracted from maize processing waste water (nejayote) generated from tortilla-making industries. Nejayote arabinoxylans (NAX) presented a ferulic acid content of 0.23 μg/mg, an arabinose to xylose ratio (A/X) of 0.65, an intrinsic viscosity, [η], of 183 ml/g and a molecular weight (Mw) of 60 kDa. Laccase-induced gels were obtained from 4% (w/v) NAX solution while, at lower concentrations, no gelation was observed. Laccase covalent cross-linking of NAX led to the formation of diferulic (di-FA) and triferulic (tri-FA) acid structures. 4% (w/v) NAX gel presented di-FA and tri-FA contents of 0.02 and 0.01 μg/mg NAX, respectively, and a G′ value of 2 Pa. Recuperation of this gum from a low-value maize by-product could represent a commercial advantage over other gums commonly used in the food industry. 相似文献
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An all-solid-state electrochromic window (SEW) of prussian blue and electrodeposited WO3 film with poly(vinyl chloride) PVC gel electrolyte with high conductivity (2 mS/cm) at room temperature has been fabricated. The SEW has been found to be excellent for electrochromism and memory characteristics. W 4f core level of WO3 film as a function of the injected charge has been investigated using X-ray photoelectron spectroscopy (XPS). W 4f peaks become broader after coloration. 相似文献
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Joseph A.N. Zasadzinski Jeffrey Kramer Alice Chu Robert K. Prud'Homme 《Chemical Engineering Communications》1987,52(4):283-289
Freeze-fracture TEM images of polymer network structure in aqueous hydroxypropyl guar (HPG) gels permit direct correlations between observed gel morphology and macroscopic chemical and mechanical properties. HPG in aqueous solution associates via hydrogen bonding, even without titanate crosslinker, to form an extended network, the structure of which depends on the electrolyte concentration. The titanate crosslinker acts only to weld together polymer molecules already associated by hydrogen bonding. Mechanical shear degrades the gel by breaking up the network inhomogeneously to form “fractured gel particles,” small domains of well-crosslinked gel separated by fluid domains. 相似文献
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Isabelle Déléris Anne Saint-Eve Fanny Dakowski Etienne Sémon Jean-Luc Le Quéré Hervé Guillemin Isabelle Souchon 《Food chemistry》2011
We investigated the role of both candy texture and eating technique (melting or chewing) on the dynamics of aroma release. One novelty of this type of analysis was the simultaneous application of instrumental and sensory analysis. Four candy textures were established based on their storage modulus at 1 Hz by varying the gelatine content between 0 and 15% w/w. The invivo release of three aroma compounds was monitored using Proton Transfer Reaction Mass Spectrometry and with a trained panel of testers. The gelatine content had no significant effect on the headspace/product partition and diffusion properties of the aroma compounds. The highest invivo release for all aroma compounds was obtained with the 2% gelatine sample. Our findings indicated that aroma release was determined by interaction between the product properties and oral behaviour. Relations between the dynamics of release and perception (method of Temporal Dominance of Sensations) have been established on temporal parameters. 相似文献
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Small angle neutron scattering intensities for sols and gels of the physically associating ionomer 1.39 mol% sodium sulphonated polystyrene with molecular weight 105 g/mole in xylene have been obtained over a broad wavevector (q) and concentration range. In the low q and concentration range the scattering behaviour of this ionomer/solvent system can quite readily be interpreted using the open association aggregation model. In more concentrated solutions and at higher q, however, interpretation of the scattering behaviour for polymers associating via an open association mechanism (OAM) is more difficult, particularly if, as in this investigation, the single chains and aggregates have varying densities and fractal parameters. In this study various methods have been developed to interpret the low and high q scattering from systems whose extent of aggregation can be modelled using the OAM. Using these methods it has been possible to confirm that the open association model can be used to interpret the extent of aggregation of the above ionomer in xylene even after the solutions appear to be gelled. Single ionomer chains within both the dilute solutions and gels were found via modelling to have a radius of gyration of 60 Å, which compares with dimensions of 25 Å and 93 Å calculated for a solid sphere of polystyrene or an unperturbed polystyrene Gaussian coil, respectively. The aggregates, however, all had radii of gyration comparable with what would be expected for polystyrene of the aggregate molecular weight in an unperturbed state. These results suggest that gelation of ionomer solutions at particular concentration thresholds is not due to an abrupt change in the aggregate structures at some critical concentration but occurs as a result of interactions between the very large aggregates that the OAM predicts should gradually form as the ionomer concentration increases. 相似文献
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