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11.
以2-溴-1-(2-噻吩)-1-乙酮和对-甲基苯甲胺为原料,在复合催化剂碘与叔丁基过氧化氢的作用下,通过氧化环合反应合成了5-(2-噻吩)-2-对-甲苯基噁唑。产物结构经FTIR,NMR 和MS检测。结果显示:合成产物的最佳条件为:2-溴-1-(2-噻吩)-1-乙酮1 mmol、对-甲基苯甲胺1.3 mmol、碘0.2 mmol、质量分数55%的叔丁基过氧化氢1.2mmol、碳酸氢钠1.0 mmol,室温下反应12 h,产物收率为89.7 %。抑菌圈测定结果显示该产物对大肠杆菌具有强的抑菌能力。 相似文献
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Xu-Hua Wan Shu-Xia Chen Cong-Ying Wang Ran-Ran Zhang Si-Qiong Cheng Huan-Wen Meng Xiao-Qing Shen 《International journal of molecular sciences》2013,14(11):22082-22101
A full-length cDNA coding for hydroperoxide lyase (CsHPL) was isolated from cucumber fruits of No. 26 (Southern China type) and No.14-1 (Northern China type), which differed significantly in fruit flavor. The deduced amino acid sequences of CsHPL from both lines show the same and significant similarity to known plant HPLs and contain typical conserved domains of HPLs. The recombinant CsHPL was confirmed to have 9/13-HPL enzymatic activity. Gene expression levels of CsHPL were measured in different organs, especially in fruits of different development stages of both lines. The HPL activities of fruit were identified basing on the catalytic action of crude enzyme extracts incubating with 13-HPOD (13-hydroperoxy-(9Z,12E)-octadecadienoic acid) and 13-HPOD + 9-HPOD (9-hydroperoxy-(10E,12Z)-octadecadienoic acid), and volatile reaction products were analyzed by GC-MS (gas chromatography-mass spectrometry). CsHPL gene expression in No. 26 fruit occurred earlier than that of total HPL enzyme activity and 13-HPL enzyme activity, and that in No. 14-1 fruit was consistent with total HPL enzyme activity and 9-HPL enzyme activity. 13-HPL enzyme activities decreased significantly and the 9-HPL enzyme activities increased significantly with fruit ripening in both lines, which accounted for the higher content of C6 aldehydes at 0–6 day post-anthesis (dpa) and higher content of C9 aldehydes at 9–12 dpa. 相似文献
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Homogeneous oxidation using an oil-soluble oxidant, tert-amyl hydroperoxide (TAHP), for ultra-deep desulfurization was performed under mild conditions in the presence of molybdenum oxide catalysts. Dibenzothio-phene (DBT), benzothiophene (BT) and 4, 6-dimethyl-dibenzothiophene (DMDBT), which are the refractory sulfur compounds for hydrodesulfurization (HDS), were employed as model substrates for a simulated diesel fuel. Activ-ity of molybdenum oxide supported on a macroporous weak acidic resin was investigated. The mass conversion of DBT reached near 100% at 90°C and a TAHP/DBT molar ratio of 3 with 1% of molybdenum oxide supported on Amberlite IRC-748 resin for 1 h. It was further found that the activities of the model substrates decreased in the or-der of DMDBT>DBT>BT. In the flow oxidation using TAHP as the oxidant, mass conversion of DBT increased remarkably from 61.3% to 98.5% when dropping the weight hourly space velocity (WHSV) from 40 h-1 to 10 h-1. A series of experiments dealt with selectivity of this oxidation using TAHP revealed that the model unsaturated compounds, i.e. 4, 6, 8-trimethyl-2-nonylene, and 2-methylnaphthalene did not affect the oxidation of DBT. Car-bazole had nearly no effect on the conversion of DBT using TAHP, but had some influence on the one using tert-butyl hydroperoxide (TBHP). The mass conversion of DBT decreased remarkably from 75.2% to 3.6% when the content of carbazole increased from 0 to 500 μg•g-1. In the flow oxidation using TAHP as the oxidant, the con-centration of DBT in model fuels was reduced from 500 µg•g-1 to 7.2 µg•g-1 at WHSV of 10 h-1, and then reduced to 3.8 µg•g-1 by adsorption of Al2O3. 相似文献
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大豆脂肪氧合酶酶促合成亚油酸氢过氧化物 总被引:8,自引:1,他引:8
研究了水相体系中大豆脂肪氧合酶酶促合成亚油酸(LA)氢过氧化物的反应,最佳反应条件为底物质量浓度4 11g/L,pH=9,5℃,反应时间120min,亚油酸氢过氧化物产率80%。当m(LA)∶m(surfactant)=1∶1时,Tween系列、CTAB、AOT、AEO4、OAPCG、S8390均能加速反应,其中AEO4使反应时间缩短至30min,产率提高12%。一些盐可以明显地加快反应进程,其中柠檬酸钠使反应时间缩短至15min。外源Fe3+在反应体系中的浓度为0 5μmol/L或外源Fe2+为5nmol/L时反应速度显著提高,消除了滞后期。 相似文献
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Long-term behavior of oil-based varnishes and paints I. Spectroscopic analysis of curing drying oils
Jacky Mallégol Jean-Luc Gardette Jacques Lemaire 《Journal of the American Oil Chemists' Society》1999,76(8):967-976
The curing of drying oils at 60°C has been investigated by Fourier transform infrared spectroscopy and Fourier transform Raman
analysis of linseed oil and poppyseed oil. In the first step, hydroperoxides are formed (broad vibration band centered around
3425 cm−1) with concomitant conjugation and cis-trans isomerization of the double bonds (disappearance of cis bands at 3011 and 716 cm−1, appearance of trans conjugated and trans nonconjugated bands at 987 and 970 cm−1). The subsequent decomposition of hydroperoxides in the presence of oxygen leads to the formation of alcohols (nitrite band
at 779 cm−1 after nitrogen monoxide treatment), aldehydes (bands at 2810 and 2717 cm−1 in gas phase), ketones (saturated and unsaturated at 1720 and 1698 cm−1, respectively), carboxylic acids (saturated and unsaturated acid fluorides identified at 1843 and 1810 cm−1 after SF4 treatment), and peresters or γ-lactones (near 1770 cm−1). A rapid decrease in the double-bond concentration is recorded when curing continues, and the formation of epoxides, characterized
by a vibration band at 885 cm−1, is observed. Thermolysis experiments have suggested the proposal of a reaction of addition of peroxyl radicals on the conjugated
double bonds as a probable mechanism. This mechanism explains both the rapid disappearance of conjugated double bonds and
the formation of epoxides as intermediate products observed in the initial step of curing. 相似文献
20.
以反-4-(反-4-正丙基环己基)-环己基甲醛为原料,经Wittig、加氢、酸解反应合成反-4-(反-4-正丙基环己基)-环己基丙醛,总收率71.5%。目标化合物经1 H NMR、13 C NMR、IR和GC-MS表征。探讨了加氢的机理及反应的最佳条件,加氢实验结果表明:以Raney-Ni/MgSO4为催化剂,甲苯乙醇为反应溶剂,当反应温度为35℃,压力为0.5MPa时,反应效果最佳。加氢后粗产物经甲苯甲醇重结晶后用无水甲酸重复酸解两次,原料能酸解至0.01%以下。该合成路线中加氢及酸解反应的突破,推广了反-4-(反-4-正丙基环己基)-环己基丙醛在双环己基液晶单体合成领域中的广泛应用。 相似文献