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旋转锅蒸料改革新法──“双高法”
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作者 曹骏生 《中国酿造》 CAS 北大核心 1996年第1期40-41,共2页
关键词 酿造 旋转锅 蒸料 双高法 调味品
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高压旋喷桩在含承压水砂质粉土和粉砂土加固中的应用研究 被引量:10
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作者 郭庆清 陈月顺 夏焰光 《建筑技术》 北大核心 2009年第5期466-468,共3页
目前国内外旋喷桩施工经验较少,尤其是超深旋喷桩在施工中易受到诸如地层物理性质、力学性质、埋深、地下障碍物、施工参数等多种因素的影响。本文就采用高压旋喷法对含承压水砂质粉土和粉砂土加固时参数的合理确定进行了三种工法的对... 目前国内外旋喷桩施工经验较少,尤其是超深旋喷桩在施工中易受到诸如地层物理性质、力学性质、埋深、地下障碍物、施工参数等多种因素的影响。本文就采用高压旋喷法对含承压水砂质粉土和粉砂土加固时参数的合理确定进行了三种工法的对比研究,并评价了相关工法的加固效果。 展开更多
关键词 高压旋喷桩 地基处理 小型超级旋喷 双高
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深层粉砂土中高压旋喷桩施工工艺研究 被引量:2
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作者 郭庆清 夏焰光 《人民长江》 北大核心 2009年第5期69-70,106,共3页
目前国内外旋喷桩施工经验较少,尤其是超深旋喷桩在施工中易受到诸如地层物理性质、力学性质、埋深、地下障碍物、施工参数等多种因素的影响,施工经验更少。采用高压旋喷法对含承压水的砂质粉土和粉砂土加固时参数的合理确定进行了3种... 目前国内外旋喷桩施工经验较少,尤其是超深旋喷桩在施工中易受到诸如地层物理性质、力学性质、埋深、地下障碍物、施工参数等多种因素的影响,施工经验更少。采用高压旋喷法对含承压水的砂质粉土和粉砂土加固时参数的合理确定进行了3种工法的对比研究,结果表明:普通三管法、RJP工法、SJS工法均能满足加固要求,普通三管法形成的桩径较小,RJP及SJS工法施工成本较高,具体可以根据实际情况进行选用;注浆管连续提升和断续提升对桩径的影响并不显著;国产旋喷设备基本能够满足RJP及SJS工法的施工要求;钻孔倾斜度基本能满足旋喷桩的搭接要求。 展开更多
关键词 高压旋喷 小型超级旋喷 双高 施工工艺
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Assessment of Contemporary Theoretical Methods for Bond Dissociation Enthalpies 被引量:3
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作者 李璐 樊红军 胡浩权 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2016年第4期453-461,I0001,I0002,共11页
The density functional theory (DFT) is the most popular method for evaluating bond dis- sociation enthalpies (BDEs) of most molecules. Thus, we are committed to looking for alternative methods that can balance the... The density functional theory (DFT) is the most popular method for evaluating bond dis- sociation enthalpies (BDEs) of most molecules. Thus, we are committed to looking for alternative methods that can balance the computational cost and higher precision to the best for large systems. The performance of DFT, double-hybrid DFT, and high-level com- posite methods are examined. The tested sets contain monocyclic and polycyclic aromatic molecules, branched hydrocarbons, small inorganic molecules, etc. The results show that the mPW2PLYP and G4MP2 methods achieve reasonable agreement with the benchmark val- ues for most tested molecules, and the mean absolute deviations are 2.43 and 1.96 kcal/mol after excluding the BDEs of branched hydrocarbons. We recommend the G4MP2 is the most appropriate method for small systems (atoms number≤20); the double-hybrid DFT methods are advised for large aromatic molecules in medium size (20≤atoms number≤50), and the double-hybrid DFT methods with empirical dispersion correction are recommended for long-chain and branched hydrocarbons in the same size scope; the DFT methods are ad- vised to apply for large systems (atoms number〉50), and the M06-2X and B3P86 methods are also favorable. Moreover, the differences of optimized geometry of different methods are discussed and the effects of basis sets for various methods are investigated. 展开更多
关键词 Bond dissociation enthalpies Density functional theory Double-hybrid density functional theory High-level composite methods
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Polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) in surface sediment and bivalve from the Changjiang Estuary, China 被引量:2
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作者 闻胜 惠阳 +2 位作者 杨方星 刘征涛 徐盈 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2008年第1期35-44,共10页
Surface sediments and bivalves were collected from the Changjiang Estuary in December 2003 and November 2004, respectively. Polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) in these samples were mea... Surface sediments and bivalves were collected from the Changjiang Estuary in December 2003 and November 2004, respectively. Polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) in these samples were measured with high-resolution chromatography (HRGC)/High Resolution Mass Spectrometer (HRMS). The concentrations of total PCDD/Fs and toxic equivalent (TEQ) were 169.83±119.63 and 0.81±0.36 pg/g dry weight (dw) in sediments, and 580.33±240.17 and 7.24±3.65 pg/g dw in bivalves. The homolog compositions of PCDD/Fs were similar among samples, the most abundant congener was octa-chlorinated dibenzo-p-dioxin (OCDD) and then octa-chlorinated dibenzofuran (OCDF) and 1,2,3,4,6,7,8-hepta-chlorinated dibenzo-p-dioxin (HpCDD). The herbicide pentachlorophenol (PCP) and sodium pentachlorophenol (Na-PCP) were proved the main source of PCDD/Fs in this area. 展开更多
关键词 BIVALVE high resolution gas chromatography (HRGC)/high resolution mass spectrometer(HRMS) polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) pentachlorophenol (PCP) surface sediment
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A Physics-Based Dual-Frequency Approach for Altimeter Wind Speed Retrieval
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作者 LI Shuiqing ZHOU Liangming +3 位作者 LI Zhanbin MIAO Qingsheng MOU Lin WANG Aifang 《Journal of Ocean University of China》 SCIE CAS 2014年第4期579-583,共5页
The altimeter normalized radar cross section(NRCS) has been used to retrieve the sea surface wind speed for decades, and more than a dozen of wind speed retrieval algorithms have been proposed. Despite the continuing ... The altimeter normalized radar cross section(NRCS) has been used to retrieve the sea surface wind speed for decades, and more than a dozen of wind speed retrieval algorithms have been proposed. Despite the continuing efforts to improve the wind speed measurements, a bias dependence on wave state persists in all wind algorithms. On the basis of recent evidence that short waves are essentially modulated by local winds and much less affected by wave state, we proposed a physics-based approach to retrieve the wind speed from the dual-frequency difference in terms of the mean square slope of short waves. A collocated dataset of coincident altimeter/buoy measurements were used to develop and validate the approach. Validation against buoy measurements indicates that the approach is almost unbiased and has an overall root mean square error of 1.24 m s-1, which is 5.3% lower than the single-parameter algorithm in operational use(Witter and Chelton, 1991) and 2.4% lower than another dual-frequency approach(Chen et al., 2002). Furthermore, the results indicate that the new approach significantly improves the wave-dependent bias compared to the single-parameter algorithm. The capacity of altimeter to retrieve sea surface wind speed appears to be limited for the case of winds below 3 m s-1. The validity of the approach at high winds needs to be further examined in the future study. 展开更多
关键词 ALTIMETER mean square slope DUAL-FREQUENCY wind speed retrieval
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Validation of Metformin Hydrochloride in Human Plasma by HPLC-Photo Diode Array (PDA) for Application of Bioequivalence Study
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作者 Yahdiana Harahap Krisnasari Dianpratami Mahi Wulandari Rina Rahmawati 《Journal of Life Sciences》 2012年第1期20-27,共8页
A sensitive and specific high performance liquid chromatography (HPLC) method was developed and validated for the simultaneous determination of metformin hydrochloride (HCI) in human plasma. The HPLC method consis... A sensitive and specific high performance liquid chromatography (HPLC) method was developed and validated for the simultaneous determination of metformin hydrochloride (HCI) in human plasma. The HPLC method consists of isocratic eluation with a mixture of 60% buffer (10 mM sodium dihyrogenphosphate-10 mM sodium dodecyl sulphate) and 40% acetonitrile with final pH 7.0 with flow rate of 1.0 mL/min on a Kromasil~ Akzo Nobel RP-18 (4.6 mm ID ~ 250 mm, 5 ~tm) column at an ambient temperature. Photo diode array detection was performed in program mode at 234 rim. The analyte and diazepam as internal standard (IS) were extracted from plasma using 10% trichloroacetic acid. The assay was linear over the therapeutic concentration range of 20-2,500 ng/mL for metformin HCI with correlation coefficient of r = 0.9999. Limit of quantitation was 20 ng/mL. The results obtained for intraJinter day accuracy and precision complied very well with the generally accepted criteria for bio-analytical assay. The method was applied to bioequivalence (BE) study of metformin HCI in healthy Indonesian volunteers after treatment with 750 mg XR metformin HCI. This BE study shows that the two formulations are equivalent so that they were therapeutically interchangeable for each other. 展开更多
关键词 Metformin HCl DIAZEPAM HPLC sodium dodecyl sulphate (SDS) photo diode array (PDA) detector bioequivalence(BE) study.
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