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Search Results: 1 - 10 of 310133 matches for " <br>范丽 "
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The Design of Establishing“Linguistics and Applied Linguistics Information Portal”
“语言学及应用语言学学科知识门户站点”建设构想与技术实现*

Fan Yafang,Bian Li,<br>亚芳,
现代图书情报技术 , 2005,
Abstract: The paper introduces the necessity of establishing linguistics and applied linguistics information portal. It analyses the information portal from construction idea, content frame and the realization technique.
k-FAULT DIAGNOSIS OF ANALOG CIRCUITS WITH SMALL TOLERANCE
小容差模拟电路的k故障诊断

Fan Lijuan,Yang Yinchun,<br>,杨迎春
电子与信息学报 , 1991,
Abstract: The influence of elemenr tolerance on fault diagnosis of linear circu-its has been discussed. The estimated formula of threshold value used to pick out the set of k-faulty elements and the algorithm of k-fault diagnosis are given.
Preliminary Study of Statistically Downscaled Temperature Ensemble Predictions in Eastern China
统计降尺度方法集合预估华东气温的初步研究

FAN Li-jun,<br>
高原气象 , 2010,
Abstract: 利用共同经验正交函数(EOF)分解和逐步线性回归相结合的统计降尺度方法, 研究了1月和7月华东地区41个气象观测站2070\_2100年未来月平均温度变化情景的集合预估。同时采用850 hPa温度场\, 850 hPa位势高度和温度的联合场以及海平面气压和850 hPa温度的联合场作为预报因子变量场, 对于两个场联合的预报因子变量场, 采用的是两个变量场空间联合的EOF分解的方法。同时通过改变统计降尺度过程中输入的预报因子变量场\, 预报因子变量取值的区域, 以及输入逐步线性回归方程的主分量个数共建立27种统计降尺度模型, 并把它们应用于2种全球气候模式(GCMs): Echam5和 HadCM3 IPCC AR4 20C3M和A1b情景, 从而每个站点均生成1950-2099年(HadCM3)或1951-2100年( Echam5)1月和7月共54个IPCC TR4 A1b温度变化情景, 然后对54种预估情景进行集合分析。多个温度变化情景的集合预估采用它们的中位数来表示。结果表明: (1)当前气候条件下, 多个统计降尺度结果的集合预报如采用箱线图的中位数能够在一定程度上提高统计降尺度方法的模拟性能; (2)2070-2100年1月和7月未来气温情景相比当前气候条件的增温约3~4℃, 7月与1月相比不确定性增大。
Analysis on Variation Trend of Season Start Dates over the Tibetan Plateau during 1961-2007
1961~2007年青藏高原四季开始日期的变化趋势分析

FAN Sirui,FAN Guangzhou,LAI Xin,ZHU Lihua,<br>思睿,广洲,赖欣,
气候与环境研究 , 2013,
Abstract: 利用中国气象局国家气象信息中心提供的青藏高原60个测站1961~2007年逐日气温度资料,分析了青藏高原近47年来四季开始日期的时空变化特征和年代际变化趋势.结果表明,青藏高原的四季开始日期变化主要表现为春季和夏季的提前趋势,秋季和冬季的推后趋势,其中春季、冬季的变化显著,夏季、秋季的变化相对春季、冬季变化较小,四季开始日期的这种变化在增温明显的1990年代和21世纪初最为明显,并且春季和冬季开始日期的年代变化较大,而夏季和秋季开始日期的年际变化较大.这种变化趋势在空间分布上有所差异,春季和冬季开始日期变化的空间分布相似,春季和冬季开始日期的变化在空间上有相当的同步性而且都属于“中间高两边低”的分布状态,夏季和秋季开始日期变化的空间分布相似.此外,春季开始日期在1990年代之前整体相对平稳并没有表现出明显的提早趋势,从1990年代开始变得较明显;夏季开始日期的提早变化相对平稳但年际变化较大;秋季开始日期的推迟相对平稳但是年际变化较大,1990年代有较明显的推迟趋势;冬季在1990年代表现出推迟趋势但是并不明显,但是到21世纪初表现出强烈的推迟.
自制调味汁烹饪红烧肉中关键香气活性化合物的分析研究

- , 2017, DOI: 10.13982/j.mfst.1673-9078.2017.7.035
Abstract: 采用顶空固相微萃取(headspace-solid phase microextraction,HS-SPME)和同时蒸馏萃取(simultaneous distillation and extraction,SDE)两种前处理方法,对用自制调味汁和白砂糖烹饪出的两种红烧肉分别进行气相色谱-质谱联用(gas chromatography- mass spectrometry,GC-MS)分析,对挥发性成分进行分析和比较。结果显示,采用自制调味汁制备的红烧肉中风味物质的种类及含量与白砂糖所烹饪的差异不显著。进一步采用香气稀释法-气相色谱-嗅闻分析(aroma extraction dilution analysis-gas chromatography -olfactometry,AEDA-GC-O),对自制调味汁烹饪的红烧肉进行关键香气成分分析鉴定,确定了35种特征性风味成分,其中Log3FD≥3的有22种,主要为醛类化合物、萜类化合物和芳香族化合物。OAV>1的有反式-2,4-癸二烯醛、壬醛、己醛、戊醛、糠醛、1-柠烯、芳樟醇、肉桂醛和2-乙酰基呋喃等15种关键香气成分,分为“肉香”、“烤香”、“坚果香”、“香辛料香”、“甜香”及“其它气味特征”六类,是红烧肉的特征香味。
The headspace-solid phase microextraction (HS-SPME) and the simultaneous distillation and extraction (SDE) methods were used to extract the compounds of two braised pork samples that were cooked with self-made braised sauce (BS) and sugar (B), respectively. The volatile aroma components of the two samples were characterized and compared by gas chromatography-mass spectrometry (GC-MS). The results showed no significant differences between the two types of braised pork samples with respect to the type and composition of the volatile compounds. Furthermore, aroma extraction dilution-gas chromatography-olfactometry analysis was used to identify the key aroma components in the braised pork cooked with BS, and 35 types of characteristic flavor compounds were identified. Among them, 22 compounds had a log3FD of ≥3, and most of them were aldehydes, terpenoids, and aromatic compounds. The odor activity value (OAV) analysis indicated that 15 key aroma components had an OAV value of >1, including trans-2,4-decadienal, nonanal, hexanal, pentanal, furfural, limonene, linalool, cinnamic aldehyde, and 2-acetyl furan. The characteristic flavor of the braised pork was categorized as “meat flavor,” “roast flavor,” “nut type flavor”, “spicy flavor,” “sweet flavor,” and “other characteristic flavor.”
Existence of Feasible Solutions of Bilevel Programming
二层规划可行解的存在性

FAN Li-Ya,LIU San-Yang,<br>,刘三阳
数学物理学报(A辑) , 2003,
Abstract: Bilevel programming is usually formulated with two optimization problems where the constraint set of the first one (upper level problem) is partially determined by the optimal reactions of the second one (lower level problem). The paper is devoted to study the existence of feasible solutions, which plays a fundamental and important role in bilevel programming, by means of the w pseudo monotonicity of the Clarke's subdifferential mapping of the lower level objective function.
Observer Design for a Class of Nonlinear System Based on Input Output Linearization Approach
基于输入输出线性化方法的一类非线性系统观测器设计

DONG Yali,YANG Yingjuan,FAN Jiaojiao,<br>董亚,杨迎娟,姣姣
系统科学与数学 , 2009,
Abstract: The problem of observer design for a class of nonlinear system is considered. Based on input-output linearization approach, the observer design for the nonlinear system is developed. The nonlinear system presented in this paper is of characteristic of multi-input multi-output. Under appropriate conditions, it is proved that the proposed observer assured that the observation error converges to zero asymptotically. A simulation result shows the validity of the results.
THEORETICAL AND EXPERIMENTAL ANALYSES OF THERMAL BUCKLING PROBLEMS OF LINER SHELLS (II) -EXPERIMENTAL PART
安全壳中钢衬壳热屈曲问题理论与实验研究(Ⅱ)──实验部分

Wang Anwen,<br>钦珊,徐秉业,陈正新,丁红
力学学报 , 1999,
Abstract: In the present paper, the problem of the axisymmetric postbuckling response has been investigated for thin circular plates and delaminated circular films under the action of inplane compression. Especially, the problem of the asymmetric bifurcation buckling occuring at the stage of the axisymmetric postbuckling deformation has beed investigated for the first time.The regular solutions of the axisymmetric buckling and postbuckling equations are derived by the use of power series expansions, and the solutions of the equations for the second-time bifurcation buckling and postbuckling are obtained by using the Fourier series and the power series simultaneously.The delaminated circular film is treated as a thin circular plate clamped to the substrate along the boundary of the delaminated zone, and the energy release rates corresponding to the two stages of tile postbuckling deformation of the film are calculated.
How to choose proper parameter values for poker test
扑克检测的参数选择

Chen Hua,Fan Li-Min,<br>陈 华,
中国科学院研究生院学报 , 2008,
Abstract: Poker test is one of the basic statistical tests for judging whether or not a binary sequence is random. It belongs to the kinds of statistical tests that need extra parameter values as input. In this paper, how to determine the proper parameter values for poker test is explored and through a large number of experiments, we find some parameter values seem to be able to act as the representative ones.
Modeling of pressure drop distribution in circulating fluidized bed scrubber
循环流化床烟气脱硫系统内压降的建模

Fan Liting,Wang Fuli,Li Hongru,<br>,王福利,李鸿儒
环境工程学报 , 2013,
Abstract: Pressure drop is the key operating variable to maintain the circulating fluidized bed (CFB) scrubber running safely. It is important to estimate the flow behavior in the CFB scrubber and regulate the pressure drop in the range of set value. By analyzing the contact regime in the scrubber, one-dimensional axial flow model was established based on material conservation and experimental correlations. Simulation studies were performed to investigate the steady state and dynamic behaviors of the CFB scrubber, and the simulation results indicated that the performance of the proposed model was satisfactory and the model could subsequently be used in studies of control and optimization design of the CFB scrubber.
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