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Search Results: 1 - 10 of 13568 matches for " Fei Kong "
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Optimal Operation of Multi-Objective Hydropower Reservoir with Ecology Consideration  [PDF]
Xuewen Wu, Xianfeng Huang, Guohua Fang, Fei Kong
Journal of Water Resource and Protection (JWARP) , 2011, DOI: 10.4236/jwarp.2011.312100
Abstract: Aiming at the problem that traditional optimal operation of hydropower reservoir pays little attention to ecology, an optimal operation model of multi-objective hydropower reservoir with ecology consideration is established which combines the ecology and power generation. The model takes the maximum annual power generation benefit, the maximum output of the minimal output stage in the year and the minimum shortage of ecological water demand as objectives, and water quantity balance of reservoir, reservoir storage, discharge flow, output and so on as constraints. Chaotic genetic arithmetic is developed to solve the optimal model. An example is studied, showing that the annual generation of the proposed model is 8 million kW?h less than that model without ecology consideration, which is about 0.28 percent. But the proposed model is in favor of river ecology protection, and can promote the sustainable utilization of water resources. So it is worthy and necessary for the optimal operation of hydropower reservoir with ecology consideration.
Dimethyl 4-(4-formylphenyl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate
Fei Teng,Fanpeng Kong,Qingjian Liu
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536807063428
Abstract: The title compound, C18H19NO5, is a product of the Hantzsch reaction of p-phthalaldehyde, methyl acetoacetate, and ammonium acetate. The 1,4-dihydropyridine ring of the molecule adopts a flattened boat conformation. The benzene ring is almost perpendicular to the 1,4-dihydropyridine ring; the plane through the six C atoms of the benzene ring and the plane through the four C atoms that form the base of the boat-shaped 1,4-dihydropyridine ring (excluding the ring N atom and the opposite ring C atom) make a dihedral angle of 87.60 (3)°. Intermolecular N—H...O hydrogen bonds result in the formation of extended chains along the a axis.
Effect of V and Nb additions on microstructure, properties, and deformability of Ti-45Al-9 (V, Nb, Y) alloy
Yang Fei,Kong Fantao,Chen Yuyong
China Foundry , 2010,
Abstract: Ti-45Al-9(V, Nb, Y) alloys with four different x=V/Nb (atomic ratio x = 1, 1.5, 2 and 3.5) have been prepared, and the microstructures, properties and hot deformation behaviors were investigated. SEM, XRD and TEM results showed that Ti-45Al-9(V, Nb, Y) alloys were mainly composed of γ, α2, and β phase, and the volume fraction of β phase increased with the increase of the atomic ratio of V/Nb. The alloys were featured with lamellar microstructure with β and γ phases locating at the colony boundaries, and some β precipitates appearing at γ/γ interfaces. It was found that the colony size decreased with the increase of x. The alloys exhibited moderate mechanical properties at room temperature, with a yield strength of over 600 MPa, and fractures showed mainly translamellar character. The alloy with x=3.5 exhibited the best deformability at elevated temperature and that with x=1 had superior oxidation resistance at 800 ℃.
Homogeneous Isolation of Nanocellulose from Cotton Cellulose by High Pressure Homogenization  [PDF]
Yihong Wang, Xiaoyi Wei, Jihua Li, Qinghuang Wang, Fei Wang, Lingxue Kong
Journal of Materials Science and Chemical Engineering (MSCE) , 2013, DOI: 10.4236/msce.2013.15010
Abstract: Nano-cellulose materials are widely believed to have the potential to push polymer mechanical properties. The cotton cellulose was dissolved in ionic liquid (1-butyl-3-methylimidazolium chloride ([Bmim]Cl)), and then was isolated by high pressure homogenization in a homogeneous media. The nano-cellulose was obtained at 80MPa for 30 cycles. The geometry and microstructure of the cellulose nano-fibres were observed by SEM and their particle size analysis. FTIR, XRD and TGA were used to characterize changes to chemical functionality. Particular emphasis is given to the physical and chemical characterization of these nano-fibres together with their thermal stability and crystallinity, in order to develop their suitability.
Investment decision optimization for delayed productdifferentiation based on queuing theory
Fei Qingyi, Kong Nan, Zhao Lindu
- , 2018, DOI: 10.3969/j.issn.1003-7985.2018.04.017
Abstract: To balance inventory cost with diverse demand, an optimal investment decision on necessary process improvement for delayed product differentiation is studied. A two-stage flexible manufacturing system is modeled as a continuous time Markov chain. The first production stage manufactures semi-finished products based on a make-to-stock policy. The second production stage customizes semi-finished products from the first production stage on a make-to-order policy. Various performance measures for this flexible manufacturing system are evaluated by using matrix geometric methods. An optimization model to determine the level of investment on process improvement that minimizes the manufacturer’s total cost is established. The results show that, a higher investment level can reduce both the expected customer order fulfillment delay and the expected semi-finished products inventory. When the initial order penetration point is 0.4, the manufacturer’s total cost is reduced by 15.89% through process investment. In addition, the optimal investment level increases with the increase in the unit time cost of customer order fulfillment delay, and decreases with the increase in the product value and the initial order penetration point.
Detection of Glutamic Acid in Oilseed Rape Leaves Using Near Infrared Spectroscopy and the Least Squares-Support Vector Machine
Yidan Bao,Wenwen Kong,Fei Liu,Zhengjun Qiu,Yong He
International Journal of Molecular Sciences , 2012, DOI: 10.3390/ijms131114106
Abstract: Amino acids are quite important indices to indicate the growth status of oilseed rape under herbicide stress. Near infrared (NIR) spectroscopy combined with chemometrics was applied for fast determination of glutamic acid in oilseed rape leaves. The optimal spectral preprocessing method was obtained after comparing Savitzky-Golay smoothing, standard normal variate, multiplicative scatter correction, first and second derivatives, detrending and direct orthogonal signal correction. Linear and nonlinear calibration methods were developed, including partial least squares (PLS) and least squares-support vector machine (LS-SVM). The most effective wavelengths (EWs) were determined by the successive projections algorithm (SPA), and these wavelengths were used as the inputs of PLS and LS-SVM model. The best prediction results were achieved by SPA-LS-SVM (Raw) model with correlation coefficient r = 0.9943 and root mean squares error of prediction (RMSEP) = 0.0569 for prediction set. These results indicated that NIR spectroscopy combined with SPA-LS-SVM was feasible for the fast and effective detection of glutamic acid in oilseed rape leaves. The selected EWs could be used to develop spectral sensors, and the important and basic amino acid data were helpful to study the function mechanism of herbicide.
Sensitive Detection of Haloperidol and Hydroxyzine at Multi-Walled Carbon Nanotubes-Modified Glassy Carbon Electrodes
Fei Huang,Youyuan Peng,Guiying Jin,Song Zhang,Jilie Kong
Sensors , 2008, DOI: 10.3390/s8031879
Abstract: Haloperidol (i.e. HPD) and hydroxyzine (i.e. HXY), two effective and important tranquilizers with low redox activity, were found to generate an irreversible anodic peak at about +0.86 V (vs. SCE) or two anodic peaks at about +0.83 and +0.91 V in 0.05 M NaH2PO4-Na2HPO4 (pH=7.0) buffer solution with a multi-walled carbon nanotubes-modified glassy carbon electrode (i.e. MWNTs/GC), respectively. Their sensitive and quantitative measurement based on the first two anodic peaks was established under the optimum conditions. The anodic peak current was linear to HPD and HXY concentration from 1×10-7 to 2.5 ×10-5 M and 5×10-8 to 2.5 ×10-5 M, the detection limits obtained were 8×10-9 and 5×10-9 M, separately. The modified electrode exhibited some excellent characteristics including easy regeneration, high stability, good reproducibility and selectivity. The method proposed was successfully applied to the detection of HPD and HXY in drug tablets and proved to be reliable compared with ultraviolet spectrophotometry. The modified electrode was characterized by electrochemical methods.
Mechanism of Aulacophora femoralis chinensis Weise feeding behavior and chemical response of host Cucumis sativus L.
Chuihua Kong,Wenju Liang,Xiao Yang,Maoxin Zhang,Fei Hu
Chinese Science Bulletin , 2004, DOI: 10.1360/04wc0183
Abstract: When beetle Aulacophora femoralis chinensis Weise fed on cucumber seedlings, it first chewed a circular trench on their leaves and then nibbled the leaf tissues isolated by the trench, but when it was fed with the detached fresh cotyledons of cucumber, such an interesting trenching behavior did not occur, which indicated that the feeding behavior of the beetle was obviously correlated with the chemical response of the cucumber to the herbivory. Within 60 min after feeding, the level of cucurbitacin C in fed cotyledons of the cucumber seedling increased 10 fold or more. Cucurbitacin I was also detected 15 min after feeding, which reached 75 μg/g within 60 min. The high levels of cucurbitacins C and I in fed cotyledons could be maintained for at least 24 h. A. femoralis chinensis was strongly stimulated to take food by cucurbitacin C at a concentration between 10 and 250 μg/g, and the feeding deterrent activity was observed at >250 μg/g, while the feeding deterrent threshold of A. femoralis chinensis to cucurbitacin I was 50 μg/g. The mixture of cucurbitacins C and I had a much stronger feeding deterrent activity than single cucurbitacin I. The results suggested that cucumber could elicit chemical response to the beetle herbivory, its leaf being induced to produce more kinds of cucurbitacins and make them reach the levels of feeding deterrent activity on the beetle, while the trenching behavior of A. femoralis chinensis was its strategy to answer the chemical response of cucumber. The trenching behavior of the beetle not only stopped the cucurbitacins biosynthesis in cucumber leaf tissues, but also blocked the translocation of cucurbitacins to the feeding sites. The trenching behavior of the beetle and the chemical response of host cucumber were the mutual adaptive strategies for protecting the host plant and the beetle themselves.
(Dimethylformamide)(2-methylpropenoato)[tris(1-methyl-1H-benzimidazol-2-ylmethyl)amine]manganese(II) perchlorate dimethylformamide solvate
Huilu Wu,Fei Jia,Jin Kong,Fan Kou
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810036457
Abstract: In the title complex, [Mn(C4H5O2)(C27H27N7)(C3H7NO)]ClO4·C3H7NO, the MnII ion is seven-coordinated in a distorted monocapped trigonal-prismatic geometry formed by a tetradentate tris(1-methyl-1H-benzimidazol-2-ylmethyl)amine molecule, a bidentate 2-methacrylate anion and a dimethylformamide molecule. The methyl groups of the coordinated dimethylformamide molecule and the perchlorate anions are disordered over two positions with occupancy factors of 0.640 (8) and 0.360 (8).
Nermeen Galal,Jeannette Boutros,Aisha Marsafy,Xiao-Fei Kong
Mediterranean Journal of Hematology and Infectious Diseases , 2012, DOI: 10.4084/mjhid.2012.
Abstract: Background: Tuberculosis remains a major health problem in developing countries especially with the emergence of multidrug resistant strains. Mendelian Susceptibility to Mycobacterial Disease (MSMD) is a rare disorder with impaired immunity against mycobacterial pathogens. Reported MSMD etiologies highlight the crucial role of the Interferon gamma /Interleukin 12 (IFN-g/ IL-12) axis and the phagocyte respiratory burst axis. Purpose: Screen patients with possible presentations for MSMD. Methods: Patients with disseminated BCG infection following vaccination, atypical mycobacterial infections or recurrent tuberculosis infections were recruited from the Primary Immune Deficiency Clinic at Cairo University Specialized Pediatric Hospital, Egypt and immune and genetic laboratory investigations were conducted at Human Genetic of Infectious Diseases laboratory in Necker Medical School, France from 2005-2009. IFN-g level in patient’s plasma as well as mutations in the eight previously identified MSMD-causing genes were explored. Results: Nine cases from eight (unrelated) kindreds were evaluated in detail. We detected a high level of IFN-g in plasma in one patient. Through Sanger sequencing, a homozygous mutation in the IFNGR1 gene at position 485 corresponding to an amino acid change from serine to phenylalanine (S485F), was detected in this patient. Conclusion: We report the first identified cases of MSMD among Egyptian patients, including in particular a new IFNGR1 mutation underlying IFN-gR1 deficiency. The eight remaining patients need to be explored further. These findings have implications regarding the compulsory Bacillus Calmette Guerin vaccination policy in Egypt, especially given the high consanguinity rate. Keywords: Interferon gamma axis, mycobacterium tuberculosis, BCG, consanguinity
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