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Exploration of combined adjustment laws about IGV,stator and rotational speed in off-design conditions in an axial compressor

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中国科学：技术科学英文版 2010年第4期53卷 969-975页

作者： hu YanMing1,2.& NIE ChaoQun1 1 Key Laboratory of Advanced Energy and Power Technology,institute of Engineeting Thermophysics,{2. {2. of Science,beijing 100190,China 2.Graduate School of {2. {2. of sciences,beijing 100190,China 1. Key Laboratory of Advanced Energy and Power Technology Institute of Engineeting Thermophysics Chinese Academy of Science Beijing 100190 China2. Graduate School of Chinese Academy of Sciences Beijing 100190 China

Experimental investigations are performed in a three-stage low-speed axial compressor with variable inlet guide vanes(IGV) and adjustable *** characteristics of the compressor,especially the efficiency and stall margin,are analyzed in design and off-design operation conditions by adjusting stagger angles of IGV and stators as well as changing the rotational *** experimental results show that the off-design performance of the multistage axial compressor is improved by restaggering of IGV and stators related to rotational *** the background of engineering applications,digital signal processing(DSP) technique is used to realize online adjustment of stagger angles according to the corresponding relations between incidence angles of rotor and rotational speed.

关键词： axial compressor IGV surge DSP techniques off-design

Phenylalanine deprivation inhibits multiple myeloma progression by perturbing endoplasmic reticulum homeostasis

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Acta Pharmaceutica Sinica B 2024年第8期14卷 3493-3512页

作者： Longhao cheng Xiaoxue Wang Aijun Liu Ying Zhu hu cheng Jiangling Yu Lili Gong Honglin Liu Guolin Shen Lihong Liu institute of Clinical Medical sciences ChinaeJapan Friendship HospitalCapital Medical UniversityBeijing 100029China Department of Pharmacy ChinaeJapan Friendship HospitalBeijing 100029China beijing Chao-Yang Hospital Capital Medical UniversityBeijing 100020China institute of Chemicals Safety Chinese Academy of Inspection and QuarantineBeijing 100020China

Amino acid metabolic remodeling is a hallmark of cancer,driving an increased nutritional demand for amino *** acids are pivotal for energetic regulation,biosynthetic support,and homeostatic maintenance to stimulate cancer ***,the role of phenylalanine in multiple myeloma(MM)remains ***,we demonstrate that phenylalanine levels in MM patients are decreased in plasma but elevated in bone marrow(BM)*** the treatment,phenylalanine levels increase in plasma and decrease in *** suggests that changes in phenylalanine have diagnostic value and that phenylalanine in the BM microenvironment is an essential source of nutrients for MM *** requirement for phenylalanine by MM cells exhibits a similar *** phenylalanine utilization suppresses MM cell growth and provides a synergistic effect with Bortezomib(BTZ)treatment in vitro and murine ***,phenylalanine deprivation induces excessive endoplasmic reticulum stress and leads to MM cell apoptosis through the ATF3eCHOPeDR5 *** with ATF3 significantly affects phenylalanine deprivation *** conclusion,we have identified phenylalanine metabolism as a characteristic feature of MM metabolic *** is necessary for MM proliferation,and its aberrant demand highlights the importance of lowphenylalanine diets as an adjuvant treatment for MM.

关键词： Multiple myeloma Phenylalanine Amino acid metabolism Nutrient deprivation Cancer therapy Endoplasmic reticulum stress ATF3 Apoptosis

Isolation and Characterization of Photosystem Ⅱ of Porphyra yezoensis Ueda

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Acta Biochimica et Biophysica Sinica 2004年第11期36卷 780-785页

作者： Zheng-Quan GAO, Guang-Ce WANG, and cheng-Kui TSENGKey Laboratory of Experimental Marine Biology, institute of Oceanology, the {2. academy of sciences, Qingdao 2.6071, China Graduate school, the {2. academy of sciences, beijing 100039, China Key Laboratory of Experimental Marine Biology Institute of Oceanology the Chinese Academy of SciencesQingdao 266071 China Graduate school the Chinese Academy of SciencesBeijing 100039 China

The thylakoid membranes were isolated and purified from gametophyte of Porphyra yezoensis Ueda (P. yezoensis) by sucrose density gradient ultracentrifugation. After P. yezoensis gametophyte thylakoid membranes were so... 详细信息

关键词： red algae Porphyra yezoensis Ueda photosystem Ⅱ polypeptide composition extrinsic protein

Periodicity of Retzius lines in fossil Pongo from South China

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chinese Science Bulletin 2012年第7期57卷 790-794页

作者： hu Rong1,2.3, ZHAO LingXia1,2.& WU XinZhi2.1 Key Laboratory of Evolutionary Systematics of Vertebrates, institute of Vertebrate Paleontology and Paleoanthropology, {2. {2. of sciences, beijing 100044, China 2.Laboratory of human Evolution, institute of Vertebrate Paleontology and Paleoanthropology, {2. {2. of sciences, beijing 100044, China 3 Graduate University of {2. {2. of sciences, beijing 100049, China Laboratory of human Evolution Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences Beijing 100044 China

Periodicity of Retzius lines is a key factor in dental development. In this study, we examined the periodicity of Retzius lines in fossil Pongo from South China using polarized light microscope observation of dental ground sections. The periodicities all of the 15 teeth were 9 d. Comparisons of periodicity were made with extant primates, fossil apes and hominins. Periodicity of fossil Pongo from South China was relatively long but fell within the variation of extant Pongo, Gorilla and modern human, and longer than periodicity of Pan and other extant primates. Fossil Pongo from South China was similar to Lufengpithecus and Sivapithecus, shorter than Gigantopithecus and longer than European and African fossil apes and most early hominins in periodicity. Generally, the periodicities of Asian large-body fossil apes were longer than the periodicities of European and African large-body fossil apes in Miocene. Difference among species and trend of evolution in periodicity were analyzed and discussed. We found that periodicity might gradually increase from Proconsul in early Miocene to several fossil apes in Miocene and then Gigantopithecus in Pleistocene. In addition, this study made correlate analysis between periodicity and body mass respectively in males and females of six extant apes and five fossil apes, and found that periodicity positively correlated with body mass.

关键词：周期性变化中国南方大猩猩化石灵长类动物早中新世类人猿显微镜观察

An improved imaging algorithm for fixed-receiver bistatic SAR

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Science China(Information sciences) 2010年第7期53卷 1461-1469页

作者： GENG XuPu1,2.3, hu Yinghui1,2. YAN Honghui2.& WANG YanFei2.1Graduate School of the chinese academy of {2., beijing 100039, China 2.7} of Electronics, chinese academy of {2., beijing 100190, China 3beijing institute of Environment Features, beijing 100854, China 1. Graduate School of the chinese academy of {2. Beijing 100039 China2. Institute of Electronics Chinese Academy of Sciences Beijing 100190 China3. Beijing Institute of Environment Features Beijing 100854 China

Based on the signal model of fixed-receiver bistatic SAR, this paper analyzes the characteristics of azimuth-variant, which includes variation of range migration curve and variation of Doppler rate caused by different azimuth position of targets. Then, an extended nonlinear chirp scaling (NLCS) algorithm is proposed, with its flowchart and phase compensation functions being provided. Simulation results show that the algorithm is available for the characteristics of azimuth-variant of fixed-receiver bistatic SAR, and good focused radar images could be acquired.

关键词： synthetic aperture radar (SAR) bistatic SAR fixed-receiver characteristics of azimuth-variant range cell migration correction (RCMC)

A USEFUL AND PRECISE EXPRESSION FOR ORIENTATION FACTOR OF POLED POLYMER FILMS

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chinese Chemical Letters 1993年第11期4卷 1007-1010页

作者： cheng YE, Jia Fu WANG institute of Chemistry, {2. academy of sciences, beijing 100080

Based on ID ROGM, d_(33) of poled films can be estimated from orientation factor . In this letter, a direct expression

关键词： A USEFUL AND PRECISE EXPRESSION FOR ORIENTATION FACTOR OF POLED POLYMER FILMS COS~3

POLYMERIZATION OF ETHYLENE WITH UNSYMMETRIC 2.6-BIS(IMINO)PYRIDINE IRON(Ⅱ)COMPLEX

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chinese Journal of Polymer Science 2002年第3期20卷 205-211页

作者： Zhi Ma Wen-hua Sun Zi-long Li Chang-xing Shao You-liang hu State Key Laboratory of Engineering Plastics and the Center for Molecular {2. institute of Chemistry {2. academy of {2., beijing 100080 China State Key Lab. of Engineering Plast. Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

An unsymmetric 2.6-bis(imino)pyridine iron(II) complex 1' was synthesized. The relationship between catalyststructure and its activity in ethylene polymerization is discussed. The kinetic behavior of ethylene polymerization and theeffects of polymerization conditions such as temperature, aluminum/iron molar ratio on the activity of catalyst and thecharacteristics of polyethylene were reported. The unsymmetric catalyst 1' has a good catalytic performance of 3.47×10~6 gPE·mol^(-1)·Fe·h^(-1) at 40℃ with aluminum/iron molar ratio = 2.00. A dependence of catalyst activity on themethylaluminoxane (MAO) concentration and reaction temperature was found. The molecular weight (MW) of polyethylenewith broad dispersity is about 10~4-10~5 g/mol. The melting temperature and branching of polyethylenes vary with changingreaction temperature and aluminum/iron molar ratio.

关键词： Unsymmetric 2.6-bis(imino)pyridine iron(Ⅱ) complex Ethylene polymerization Catalyst structure Catalytic activity

A Novel Accurate Method forMulti-Term Time-Fractional Nonlinear Diffusion Equations in Arbitrary Domains

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Computer Modeling in Engineering & sciences 2024年第2期138卷 1521-1548页

作者： Tao hu cheng huang Sergiy Reutskiy Jun Lu Ji Lin Ningbo Yongxin Engineering Consulting Co. Ltd.Ningbo315042China Taizhou huanfengWater Conservancy Engineering Co. Ltd.Taizhou318050China A.Pidhornyi institute of Mechanical Engineering Problems National Academy of Sciences of UkraineKharkiv61046Ukraine Material and Structure Department Nanjing Hydraulic Research InstituteNanjing210029China College of Mechanics and Materials Hohai UniversityNanjing211100China

Anovel accuratemethod is proposed to solve a broad variety of linear and nonlinear(1+1)-dimensional and(2.1)-dimensional multi-term time-fractional partial differential equations with spatial operators of anisotropic ***(1+1)-dimensional problems,analytical solutions that satisfy the boundary requirements are *** solutions are numerically calculated using the trigonometric basis approximation for(2.1)-dimensional *** the aid of these analytical or numerical approximations,the original problems can be converted into the fractional ordinary differential equations,and solutions to the fractional ordinary differential equations are approximated by modified radial basis functions with time-dependent *** efficient backward substitution strategy that was previously provided for a single fractional ordinary differential equation is then used to solve the corresponding *** straightforward quasilinearization technique is applied to handle nonlinear *** experiments demonstrate the suggested algorithm’s superior accuracy and efficiency.

关键词： Müntz polynomial basis backward substitutionmethod collocationmethod meshlessmethod fractional equation

INFLUENCE OF CAPILLARITY ON NANO-LITER FLOWRATE MEASUREMET WITH DISPLACEMET METHOD

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Journal of Hydrodynamics 2007年第5期19卷 594-600页

作者： GUO Qiang cheng Rui SILBER-LI Zhan-hua State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China Shanghai institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China

Nanoqiter flowrate measurements in micro-tubes with displacement method were performed and the effect of capillarity force on the accuracy was investigated through lab experiments and theoretical analysis in this article. The experiments were conducted under the pressure drops ranging from 1 kPa to 10 kPa in a circular pipe with a diameter of 50 pm, to give the pressure-flowrate （P-Q） relation and verify the applicability of the classical Hagen-Poiseuille （HP） formula. The experimental results showed that there existed a discrepancy between the experimental data and the theoretical values predicted by the HP formula if the capillary effect was not considered, which exceeded obviously the limit of the system error. And hence a modified formula for the relation, taking the capillary effect into account, was presented through theoretical deduction, and after the HP formula had been modified the error was proved to be less than 3%, which was permitted in comparison with the system error. It was also concluded that only by eliminating the effect of the capillary force in experiments could the original HP formula be employed to predict the pressure-flowrate relation in the Hagen-Poiseuille flow in the micro-tube.

关键词： nano-liter flowrate measurement,Hagen-Poiseuille (HP) formula displacement method,capillarity force