期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到47篇文章
< 1 2 3 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
不同品种青稞固态发酵制备青稞红曲活性成分的差异分析 认领 引用
1
作者 李芳 李斐然 +5 位作者 黄卫锋 张萌 杨文娟 叶雨婷 张梦实 吴大强 《中国酿造》 CAS 北大核心 2026年第6期122-128,共7页
以不同品种青稞(黑青稞、蓝青稞、白青稞)为发酵基质,经紫色红曲霉(Monascus purpureus)固态发酵制备青稞红曲,采用高效液相色谱法测定并分析青稞红曲中γ-氨基丁酸(γ-aminobutyric acid,GABA)、8种核苷成分(尿嘧啶、胞苷、次黄嘌呤、... 以不同品种青稞(黑青稞、蓝青稞、白青稞)为发酵基质,经紫色红曲霉(Monascus purpureus)固态发酵制备青稞红曲,采用高效液相色谱法测定并分析青稞红曲中γ-氨基丁酸(γ-aminobutyric acid,GABA)、8种核苷成分(尿嘧啶、胞苷、次黄嘌呤、腺嘌呤、肌苷、鸟苷、胸苷、腺苷)及花青素含量,比较不同青稞红曲中活性成分含量差异。结果表明,黑青稞红曲中的GABA含量((116.13±3.76)μg/g)显著高于蓝青稞红曲((68.85±3.68)μg/g)及白青稞红曲((51.17±1.89)μg/g)(P<0.0001)。8种核苷类成分含量在不同青稞红曲间存在显著差异(P<0.01、P<0.001、P<0.0001),且黑青稞红曲在多种核苷成分上表现出富集优势。白青稞红曲中未检出花青素,黑青稞红曲中花青素含量((81.05±5.51)μg/g)显著高于蓝青稞红曲((61.82±4.81)μg/g)(P<0.01)。综上,黑青稞是制备富含GABA、核苷类成分及花青素的高品质红曲的优质原料,可为青稞红曲的原料品种优选提供参考依据。 展开更多
关键词 紫色红曲霉 青稞红曲 γ-氨基丁酸 核苷 花青素
暂未订购 下载PDF
Studies on Production of Biodiesel by Esterification of Fatty Acids by a Lipase Preparation from Candida sp. 99-125 认领 引用 被引量：10
2
作者 DENG Li +5 位作者 NIE Kaili WANG Fang TAN Tianwei 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2005年第4期529-534,共6页
A self-made lipase preparation from Candida sp. 99-125 was used for the production of biodiesel through enzymatic esterification of fatty acids. The crude lipase powder and fermentation broth were immobilized on a che... A self-made lipase preparation from Candida sp. 99-125 was used for the production of biodiesel through enzymatic esterification of fatty acids. The crude lipase powder and fermentation broth were immobilized on a cheap fiber cloth carrier. The conditions of lipase-catalyzed esterification between long-chain fatty acids and methanol in a solvent system were investigated in detail, including the temperature, pH value, substrate concentration, solvent, absorbent agent, enzyme dosage and purity, immobilization method, the mode of addition of substrate. The results show that reaction temperature, pH of lipase micro-environment, substrate concentration, enzyme dosage and purity affect the esterification strongly. Several new methods and enzymatic procedures for improving the enzymatic reaction involving the process cost are also discussed, such as fossil diesel fuel as reaction solvent, immobilization method, multi-step gradient addition of methanol. The esterification degree of 92.8% was obtained with oleic acid and methanol under the optimal reaction condition after 12.5 h reaction time. The half-life of the immobilized lipase preparation from crude free lipase powder for esterification was 15 days. 展开更多
关键词 biodiesel fatty acid short-chain alcohol ester immobilized lipase catalysis esterification
暂未订购 下载PDF
A New Dendrobine-Type Alkaloid from Dendrobium nobile 认领 引用 被引量：12
3
作者 Qun Fang +3 位作者 LIU Wei Min ZHAO 《Chinese Chemical Letters》 SCIE CAS 2003年第3期278-279,共2页
A new dendrobine-type alkaloid has been isolated from stems of Dendrobium nobile lindl.. Its structure has been identified on the basis of spectroscopic method.
关键词 Dendrobium nobile Orchidaceae alkaloid dendronobiline A.
暂未订购 下载PDF
Typical Form of Organizational Innovation and Development Trend 认领 引用 被引量：2
4
作者 石春生 Fang +4 位作者 Xingdong YANG Cuilan Han Xinjuan 《High Technology Letters》 EI CAS 2004年第1期70-72,共3页
Nowadays the organization of enterprises is facing unprecedented change enterprises, and organizational innovation has become a magic weapon to increase enterprise competitieness. This paper analyzes the existing base... Nowadays the organization of enterprises is facing unprecedented change enterprises, and organizational innovation has become a magic weapon to increase enterprise competitieness. This paper analyzes the existing base of institutional framework and suggests several forms and the development trend of institutional framework of organizational innovation at present. 展开更多
关键词 企业 机构改革 市场竞争力 行政联合 顾客服务中心 无结构组织
暂未订购 下载PDF
Sampled-data Iterative Learning Control for Singular Systems 认领 引用 被引量：3
5
作者 孙鹏 FANG +2 位作者 Zhong Han Zhengzhi 《High Technology Letters》 EI CAS 2004年第3期70-73,共4页
Sampled-data iterative learning control (SILC) for singular systems is addressed for the first time. With the introduction of the constrained relative degree, an SILC algorithm combined with a feedback control law is ... Sampled-data iterative learning control (SILC) for singular systems is addressed for the first time. With the introduction of the constrained relative degree, an SILC algorithm combined with a feedback control law is proposed for singular systems. Convergence of the algorithm is proved in sup-norm, while the conventional convergence analysis is in λ-norm. The final tracking error uniformly converges to a small residual set whose level of magnitude depends on the system dynamics and the sampling-period. Due to inequalities to estimate the level of the existing results of SILC, convergence is guaranteed not only at the sampling instants but on the entire operation interval, so that the inter-sample behavior is guaranteed, which is more practical for real implementation. 展开更多
关键词 奇异系统 机器人控制 试验数据迭代学习控制 算法收敛
暂未订购 下载PDF
The Effect of Steel Corrosion on Bond Strength in Concrete Structures 认领 引用 被引量：4
6
作者 FANG Cong-qi +1 位作者 KOU Xin-jian 《Journal of Shanghai Jiaotong university(Science)》 EI 2005年第4期436-440,共5页
The effect of steel corrosion on the behavior of bond between steel and the surrounding concrete was investigated. Pullout tests were carried out to demonstrate bond stress-slip response for reinforcing steel bars of ... The effect of steel corrosion on the behavior of bond between steel and the surrounding concrete was investigated. Pullout tests were carried out to demonstrate bond stress-slip response for reinforcing steel bars of a series of corrosion level. Specimens either confined or unconfined were investigated for evaluation of the effect of confinement on bond strength and failure mode. Also, the tests were analyzed using nonlinear finite element analysis. It was shown that for both confined and unconfined steel bars, bond strength generally decreases as the corrosion level increases when corrosion level is relatively high. Confinement was demonstrated to provide excellent means to conteract bond loss for corroded reinforcing steel bars. It was shown that unconfined specimens generally split at a small slip with a large crack width and result in splitting failure while confined specimens contribute to a small crack width and generally cause a pullout failure. The analysis results agree reasonably well with the experiments. 展开更多
关键词 bond strength concrete corrosion finite element analysis
暂未订购 下载PDF
NUMERICAL STUDY ON THE FLOW AROUND A CIRCULAR CYLINDER WITH SURFACE SUCTION OR BLOWING USING VORTICITY-VELOCITY METHOD 认领 引用 被引量：2
7
作者 LING Guo-ping +1 位作者 FANG Jian-wen 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2002年第9期1089-1096,共8页
A vorticity-velocity method was used to study the incompressible viscous fluid flow around a circular cylinder with surface suction or blowing. The resulted high order implicit difference equations were effeciently so... A vorticity-velocity method was used to study the incompressible viscous fluid flow around a circular cylinder with surface suction or blowing. The resulted high order implicit difference equations were effeciently solved by the modified incomplete LU decomposition conjugate gradient scheme ( MILU-CG). The effects of surface suction or blowing' s position and strength on the vortex structures in the cylinder wake, as well as on the drag and lift forces at Reynoldes number Re = 100 were investigated numerically. The results show that the suction on the shoulder of the cylinder or the blowing on the rear of the cylinder can effeciently suppress the asymmetry of the vortex wake in the transverse direction and greatly reduce the lift force; the suction on the shoulder of the cylinder, when its strength is properly chosen, can reduce the drag force significantly, too. 展开更多
关键词 circular cylinder with surface suction or blowing separated vortex flow around bluff body and its control vorticity-velocity method preconditioned conjugate gradient method
暂未订购 下载PDF
Random Response of Linear Viscoelastic Systems under Random Excitation 认领 引用 被引量：1
8
作者 Zhang Tianshu +1 位作者 Fang Tong 《Journal of Donghua University(English Edition)》 EI CAS 2001年第1期68-71,共4页
A method of analyzing random response of linear viscoelastic systems under random excitation has been presented. The covariance matrices of random responses of a single-degree-freedom linear viscoelastic system subjec... A method of analyzing random response of linear viscoelastic systems under random excitation has been presented. The covariance matrices of random responses of a single-degree-freedom linear viscoelastic system subjected to stationary white noise and filtered white noise excitations have been obtained in closed form. For illustration, a numerical example has been included. It is observed that viscoelasticity has damping effect on the mean square random responses of the system, the higher is viscoelastic behavior, the higher the damping effect. 展开更多
关键词 Random response, Viscoelastic system, Random vibration.
暂未订购 下载PDF
Study of crust-mantle transitional zone along the northeast margin of Qinghai-Xizang plateau 认领 引用 被引量：1
9
作者 LAI Xiao-ling +3 位作者 ZHANG Xian-kang FANG Sheng-ming 《Acta Seismologica Sinica(English Edition)》 2004年第2期144-151,共8页
This study deals with complexity, frequency spectrum and velocity model of the crust-mantle transitional zone in different tectonic units along the northeast margin of Qinghai-Xizang plateau, based on PmP waveform dat... This study deals with complexity, frequency spectrum and velocity model of the crust-mantle transitional zone in different tectonic units along the northeast margin of Qinghai-Xizang plateau, based on PmP waveform data from two deep seismic sounding profiles passing through the area. It reveals that Moho has stable tectonic features in Ordos and Lingzhong basins, where crust and mantle are coupled as first-order discontinuity. Moho shows obvious signs of activity in Haiyuan seismic region and in the contact zone between Bayanhar block and Qaidam block. Crust and mantle in these two areas are coupled as complicated crust-mantle transitional zone consisting of multiple laminae with alternate high and low velocities, totaling 20 km in thickness. The difference between Moho of different tectonic units reflects heterogeneity of the coupled crust-mantle zone; the difference between fine structures of Haiyuan seismic region and Maqin fault zone reflects different deep material composition of the two continent-continent collision zones and the interaction between blocks. 展开更多
关键词 crust-mantle transitional zone tectonic units Haiyuan seismic region Maqin fault zone
暂未订购 下载PDF
LIE SYMMETRIES AND CONSERVED QUANTITIES OF SECOND-ORDER NONHOLONOMIC MECHANICAL SYSTEM 认领 引用 被引量：1
10
作者 FANG Jian-hui 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2002年第9期1105-1110,共6页
The Lie symmetries and the conserved quantities of the second-order nonholonomic mechanical system are studied. Firstly, by using the invariance of the differential equation of motion under the infinitesimal tran, for... The Lie symmetries and the conserved quantities of the second-order nonholonomic mechanical system are studied. Firstly, by using the invariance of the differential equation of motion under the infinitesimal tran, formations, the determining equations and the restriction equations of the Lie symmetries of the system are established, and the structure equation and the conservative quantities of the Lie symmetries are obtained. Secondly, the inverse problems of the Lie symmetries are studied. Finally, an example is given to illustrate the application of the result. 展开更多
关键词 second-order nonholonomic system Lie symmetry conserved quantity
暂未订购 下载PDF
A New Approach for Lossless Image Compression Based on Fuzzy Adaptive Prediction 认领 引用
11
作者 吴颖谦 Fang +2 位作者 Tao Shi Pengfei 《High Technology Letters》 EI CAS 2004年第2期38-41,共4页
This paper proposes a novel approach for image lossless compression based on fuzzy logic and adaptive prediction. By a flexible strategy, the method can acquire a set of original predictors describing the more detail ... This paper proposes a novel approach for image lossless compression based on fuzzy logic and adaptive prediction. By a flexible strategy, the method can acquire a set of original predictors describing the more detail characteristic. Using a neural network, the proposed method can more efficiently organize the training of original predictors and implement adaptive prediction in fuzzy style. In entropy coding phase, the context-based conditional adaptive arithmetic encoding is adopted. The experiments demonstrate the characteristics make the approach achieve good tradeoff between computational complexity and efficiency of prediction and good performance for lossless compression. 展开更多
关键词 自适应回归预测 模糊逻辑 FOSART神经网络 内容基条件算术编码 无损图像压缩
暂未订购 下载PDF
A New Method for Out-of-core Applications on Computational Grids 认领 引用
12
作者 唐剑琪 Fang +2 位作者 Binxing Hu Mingzeng 《High Technology Letters》 EI CAS 2003年第4期88-90,共3页
More and more out of core problems that involve solving large amounts of data are researched by scientists. The computational grid provides a wide and scalable environment for those large scale computations. A new met... More and more out of core problems that involve solving large amounts of data are researched by scientists. The computational grid provides a wide and scalable environment for those large scale computations. A new method supporting out of core computations on grids is presented in this paper. The framework and the data storage strategy are described, based on which an easy and efficient out of core programming interface is provided for the programmers. 展开更多
关键词 computational grid out of core computation out of core array MPI
暂未订购 下载PDF
Fashion CAD Based on Draping Knowledge 认领 引用
13
作者 Tang Minghao +1 位作者 Fang Xiaowei 《Journal of Donghua University(English Edition)》 EI CAS 2001年第2期130-132,共3页
A computer-aided design system, which is base on the knowledge of draping and frame-producer methods, is put forward. All kinds of knowledge applied here are abstracted from fashion design, where a complicate object i... A computer-aided design system, which is base on the knowledge of draping and frame-producer methods, is put forward. All kinds of knowledge applied here are abstracted from fashion design, where a complicate object is divided into several simple parts according to the body parts. And then a mathematical model of the display for real fashion illustration is elucidated. 展开更多
关键词 fashion, CAD, draping, division, frame-producer,knowledge
暂未订购 下载PDF
STUDY ON CATASTROPHIC MECHANISM FOR ROTOR DROP TRANSIENT VIBRATION FOLLOWING MAGNETIC BEARING FAILURE 认领 引用
14
作者 FANG Zhi-chu 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2002年第11期1319-1325,共7页
The nonlinear and transient vibration of a rotor, which dropped onto back-up bearings when its active magnetic bearings were out of order, was investigated. After strictly deriving its equations of motion and performi... The nonlinear and transient vibration of a rotor, which dropped onto back-up bearings when its active magnetic bearings were out of order, was investigated. After strictly deriving its equations of motion and performing numerical simulations, the time-histories of rotating speed of the dropping rotor, and normal force at the rubbing contact point as well as the frequency spectrum of the vibration displacement of back-up bearings are fully analyzed. It is found that the strong and unsteady forced bending vibration of the unbalanced and, damped rotor decelerating through : its first. bending vibtation of the unbalanced and, damped rotor decelerating through its,first critical speed as well as chattering at high frequencies caused by the nonlinearity at the rubbing contact point between, the journal and back-up bearings may lead to the catastrophic damage. of the system. 展开更多
关键词 rotor system with active magnetic bearing magnetic bearing failure transient response passing through critical speed nonlinear rubbing catastrophic mechanism
暂未订购 下载PDF
THE CONSERVATION LAW OF NONHOLONOMIC SYSTEM OF SECOND-ORDER NON-CHETAVE'S TYPE IN EVENT SPACE 认领 引用
15
作者 FANG Jian-hui 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2002年第1期89-94,共6页
The conservation law of nonholonomic system of second-order non-Chataev's type in event space is studied The Jourdain's principle in event space is presented. The invariant condition of the Jourdain's prin... The conservation law of nonholonomic system of second-order non-Chataev's type in event space is studied The Jourdain's principle in event space is presented. The invariant condition of the Jourdain's principle under infinitesimal transformation is given by introducing Jourdain's generators in event space. Then the conservation law of the system in event space is obtained under certain conditions. Finally a calculating example is given. 展开更多
关键词 event space Jourdain's principle nonholonomic system conservation law
暂未订购 下载PDF
LOQ矿用离心偶合器在胶带输送机上的应用 认领 引用 被引量：1
16
作者 陆振新 李援朝 +9 位作者 方岚 吕清华 LU Zhen-xin LI Yuan-chao FANG Lan LU Qing-huan 《煤矿开采》 2005年第3期82-83,共2页
介绍了LOQ矿用离心偶合器的传动原理、性能特点及其在胶带输送机上的使用效果。与同类偶合器相比, LOQ矿用离心偶合器技术先进、适用性强, 是胶带输送机传动联接装置的发展方向, 可以进一步应用到刮板输送机上, 具有较好的推广前景。
关键词 离心偶合器 软起动 过载保护 应用效果
暂未订购 下载PDF
The Effects of Electroacupuncture at the Heart Meridian on Myocardial Contractile Function in Rabbits with Myocardial Ischemia 认领 引用
17
作者 Fang Zhibin +3 位作者 Zhou Yiping Wang Yuelan 《Journal of Traditional Chinese Medicine》 2002年第1期47-50,共4页
　　Acute myocardial ischemia was induced by intravenous injection of pituitrin, and electroacupuncture (EA) was applied at the Heart and Lung Meridians (HM and LM), 3 points on each meridian. The changes in the left ... 　　Acute myocardial ischemia was induced by intravenous injection of pituitrin, and electroacupuncture (EA) was applied at the Heart and Lung Meridians (HM and LM), 3 points on each meridian. The changes in the left intraventricular pressure (LVP), the maximum rise rate of intraventricular pressure (LVP dp/dtmax), the area of cardiac force loop (ACFL), and the maximum shortening velocity of myocardial contractile element (Vmax) were observed. As a result, there were significant differences in the improvement of LVP, LVP dp/dtmax, ACFL and Vmax between EA at HM and LM. The regulatory action of EA at HM on the myocardial contractile function was significantly better than that of EA at LM, indicating that HM has a close relationship with the myocardial contractile function.…… 展开更多
关键词 Electroacupuncture Animals Female Male Meridians Myocardial Contraction Myocardial Ischemia Pituitary Hormones, Posterior Rabbits Random Allocation Ventricular Function, Left
暂未订购 下载PDF
The AC losses measurement and analysis of superconducting NbTi CICC for HT-TU superconducting Tokamak 认领 引用 被引量：8
18
作者 FANG Jin +1 位作者 WENG Pei-De 《Nuclear Science and Techniques》 EI CAS 2003年第1期76-82,共7页
Superconducting TF and PF coils have been measured in SULTAN test facility. Segregated copper strands are included in four NbTi CICC and this is a technical innovation. Two AC losses measurement methods, calorimetric ... Superconducting TF and PF coils have been measured in SULTAN test facility. Segregated copper strands are included in four NbTi CICC and this is a technical innovation. Two AC losses measurement methods, calorimetric and electromagnetic methods, have been used in the experiments, and a broad frequency range (from 0.05 Hz to 6 Hz) is covered in sample test. The purpose of this experiment was to investigate AC losses of TF and PF CICC conductor including segregated copper and to check the design of PF and TF CICC coated with different resistive barriers (Pb-30Sn-2Sb and Ni plating on NbTi strands). 展开更多
关键词 HT-7U 超导托卡马克装置 CICC 超导体 铌钛合金 线圈 直流损耗 测量
暂未订购 下载PDF
SDFA: a Uniform Model for String Matching Algorithms 认领 引用
19
作者 贺龙涛 Fang +4 位作者 Binxing YUN Xiaochun Hu Mingzeng 《High Technology Letters》 EI CAS 2004年第2期34-37,共4页
String matching algorithms play an important role in computer science. However, there is no uniform mathematical model to describe these algorithms. Thus, read-head-Skippable DFA (SDFA) is put forward, which is an ext... String matching algorithms play an important role in computer science. However, there is no uniform mathematical model to describe these algorithms. Thus, read-head-Skippable DFA (SDFA) is put forward, which is an extension of two-way DFA. It is proved that SDFA is equivalent to DFA. Furthermore, SDFA is a more natural mathematical model for string matching algorithms. After that, four types of the movement of the read head of string matching are analyzed and modeled by SDFA. Finally, the SDFA model of BMA string matching algorithms is given. 展开更多
关键词 字符串匹配算法 DFA 2DFA SDFA 首读跳跃确定性有限自动机
暂未订购 下载PDF
HPLC法测定国产洛索洛芬钠片人体相对生物利用度 认领 引用 被引量：3
20
作者 蒋凯 冯芳 +6 位作者 田勇 JIANG Kai FENG Fang TIAN Yong 《江苏药学与临床研究》 2005年第1期6-9,共4页
目的　建立人血浆中洛索洛芬钠浓度的HPLC测定方法 ,研究健康受试者口服国产洛索洛芬钠片的药代动力学 ,以进口洛索洛芬钠片作为参比制剂 ,计算两制剂的相对生物利用度 ,判断两种制剂是否等效。方法　血浆样品加入内标后经三氯乙酸沉淀... 目的　建立人血浆中洛索洛芬钠浓度的HPLC测定方法 ,研究健康受试者口服国产洛索洛芬钠片的药代动力学 ,以进口洛索洛芬钠片作为参比制剂 ,计算两制剂的相对生物利用度 ,判断两种制剂是否等效。方法　血浆样品加入内标后经三氯乙酸沉淀蛋白、涡旋、离心 ,吸取上清液进样。色谱柱为ShimadzuVP ODS(15 0mm× 4 . 6mmi d ,5 μmC18) ,流动相为 0 . 0 5mol·L 1磷酸二氢钾 甲醇 (2 7∶73) (v/v) ,紫外检测波长 2 30nm。测定了 2 0名受试者单剂量口服两种洛索洛芬钠片 6 0mg后血药浓度 时间过程。结果　最低检测浓度 0 . 2 μg·ml 1,回收率大于 80 % ,日间和日内的变异系数小于 10 . 5 % ,线性范围为 0 . 2～12 . 0 μg·ml 1(r=0 9998) ,符合生物样品分析的要求。主要药动学参数分别为 :国产洛索洛芬钠片 :t1/2 为 1. 39± 0 . 15h ,AUC0 . 6h10 . 71± 1 .4 5 μg·h·ml 1,Cmax7. 2 3± 1 .0 2 μg·ml 1,tmax0 4± 0 1h ;参比制剂t1/2 为 1. 4 1± 0 .15h ,AUC0. 6h10 .4 6± 1 .32 μg·h·ml 1,Cmax7 4 9± 1 .2 6 μg·ml 1,tmax0 .4± 0 .1h。结论　建立的HPLC法简单快速 ,定量可靠准确 ,适合于洛索洛芬钠临床研究。洛索洛芬钠受试制剂的相对生物利用度为 (10 3 .2± 15 .1) %。 展开更多
关键词 洛索洛芬钠 HPLC 药代动力学 相对生物利用度
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 3 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈