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排序方式: 共有155条查询结果,搜索用时 15 毫秒
1.
品质改良剂--三聚磷酸钾水溶液配方的研制 总被引:1,自引:0,他引:1
本文报道了三聚磷酸钾50%水溶液的研制配方,利用加入适当的焦磷酸钾以及控制pH值在10.9-11.9之间来抑制其水解,对制得溶液进行了多天连续测定,观察其稳定性。 相似文献
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以三聚磷酸钠生产过程为例,论述了在以纯碱为原料的非强酸性水溶液体系中,由于反应不完全导致反应物中存在少量的碳酸盐,这部分碳酸盐干扰了用酸碱滴定法测量的中和度,并据此提出中和度分析改进方法.由此可以推广到其它以纯碱为原料的非强酸性水溶液体系中. 相似文献
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谭洪波 《武汉理工大学学报(材料科学英文版)》2014,29(2):334-340
The adsorption amount, ζ-potential of cement particles and fluidity of cement paste were tested to research the competitive adsorption between naphthalene superplasticizer(FDN) and STPP. The experimental results showed that the presence of STPP could significantly improve the fluidity of cement paste and reduce the fluidity loss with FDN. There existed a competitive adsorption between STPP and FDN. STPP and calcium ions formed complexes; they preferentially adsorbed onto surface of cement particles and preempt adsorption points of FDN; and it reduced adsorption amount of FDN. In the absence of STPP, saturation adsorption amount of FDN was 5.93 mg/g; but when the dosage of STPP was 0.1%, it reduced to 4.3 mg/g(about 72.5%). The adsorption amount of FDN was reduced by STPP, but ζ-potential of cement particles enhanced and fluidity of cement paste increased because of strong negative charge effect of the complexes. Adsorption of the complexes would delay Ca2+ into liquid and inhibit formation of active adsorption points. Then, content of FDN in liquid increased with the addition of STPP and ζ-potential of cement particles became stable. In this way, fluidity loss of cement paste reduced. 相似文献
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Shuqin Xia Xiaowei Lou Xiaoming Zhang Biao Feng 《International Journal of Food Science & Technology》2014,49(5):1367-1374
The aim of this study was to prepare the new core‐shell nanocomplexes as vitamin E (VE) carriers through chitosan (CS) coating onto the liposomal membrane surface in combination with sodium tripolyphosphate (TPP) cross‐linking, and investigated their storage and thermal properties by dynamic light scattering, ζ potential and fluorescence. Results showed that no obvious aggregation of nanocomplexes particles appeared and the VE retention rate was over 80% during the 30‐day storage. Thermal experiments demonstrated that the modification of polymers enhanced the stability of liposomes against temperature, including suppressing particle aggregation, ζ potential inversion and membrane fluidity. Compared with the great leakage of VE from uncovered liposomes, the retention rate of VE loaded into nanocomplexes remained around 92% and 97% after heated at 65 °C for 30 min and 80 °C for 16 s, respectively. The findings proved that these nanocomplexes can be employed to protect VE for extending shelf‐life and enhancing thermostability, and provide feasibility for commercial usage. 相似文献
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探讨了纳米氧化锌制备过程中的团聚问题及其抗菌性能。以三聚磷酸钠为表面活性剂,辅助沉淀法制备了纳米氧化锌粉体,用XRD,TEM,TG-DTA,BET等方法对产物进行了表征。结果表明:所得纳米氧化锌为高分散的球形颗粒,属于六方纤维矿的单晶结构,平均粒径为20 nm,比表面积可达70.478 1 m2/g。线性三聚磷酸钠与锌离子的络合作用,可以使前躯体均匀成核,并通过空间位阻抑制颗粒间的聚集,避免团聚的发生。采用杯碟法测试纳米氧化锌的抑菌活性。结果显示,纳米氧化锌对金黄色葡萄球菌、大肠埃希氏菌和沙门氏菌具有很好的抑菌活性,纳米氧化锌比表面积大小决定其抑菌活性。 相似文献
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Sodium Chloride and Tripolyphosphate Effects on Physical and Quality Characteristics of Injected Pork Loins 总被引:2,自引:0,他引:2
Whole, boneless pork loins were needle-injected to a final concentration of up to 1.5% NaCl and/or 0.45% sodium tripolyphosphate (STPP) in a 4 × 4 factorial, randomized, complete block design. Percent weight gain, internal meat pH, purge loss, final product yield, cook loss, Warner-Bratzler shear, expressible moisture, and total moisture were determined. Response surface methodology was employed to create regression models and identify optimum ingredient parameters for each characteristic. NaCl and STPP improved weight gain, purge, final product yield, and moisture content. Predicted Warner-Bratzler shear was reduced approximately 50%. A salt-phosphate interaction was observed for weight gain, purge, cook loss, and expressible moisture. 相似文献
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Yu-Lung Chang Tristan C. Liu Min-Lang Tsai 《International journal of molecular sciences》2014,15(6):9979-9990
Selective isolation of Kunitz trypsin inhibitor (KTI) and lectin from soybean whey solutions by different types of chitosan beads was investigated. The chitosan beads were co-crosslinked with tripolyphosphate/genipin in solutions at pH 5, 7 or 9 (CB5, CB7, CB9). The maximum adsorption ratios of chitosan beads to KTI and lectin were observed at pH 4.4 and 5.4, respectively; highly selective separation was also demonstrated at these pHs. The adsorption ratios increased with temperature, rising between 5 and 25 °C. CB9 produced the best adsorption ratio, followed by CB7 then CB5. The critical interaction governing absorption of chitosan beads to KTI and lectin could be hydrogen bonding. At pH 9, KTI and lectin desorbed efficiently from CB7 with desorption ratios of 80.9% and 81.4%, respectively. The desorption was most likely caused predominantly by electrostatic repulsion. KTI and lectin can effectively be selectively isolated from soybean whey using this novel separation technique. 相似文献