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Experimental and numerical investigation of the impacts of rotor tip-rake on excitation forces of pump-jet propulsors

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Journal of Hydrodynamics 2024年第1期36卷 142-157页

作者： xue-qin ji Xiao-song Zhang Chen-jun Yang Xiao-qian Dong State Key Laboratory of Ocean Engineering Marine Numerical Experiment CentreSchool of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China CSSC Shanghai Marine Energy Saving Technology Co. Ltd.Shanghai200011China China Ship Scientific Research Center Shanghai Branch Shanghai200011China

The tip-clearance flow in a pump-jet propulsor exerts great impacts on the fluctuating pressures and resultant unsteady forces,which are important sources of structural vibrations and radiated noise *** blade geometry close to the tip is an important factor determining the vortex strength in the tip-clearance *** the open-water condition,the effects of raking the rotor tips on the duct-surface fluctuating pressures and the resultant unsteady forces acting on different components of the propulsor are investigated via physical model experiments and the numerical solution of Reynolds-averaged Navier-Stokes(RANS)equations coupled with the SST k-ωturbulence *** measured and simulated results of hydrodynamic pressures are consistent to each other,and the simulated flows help better understand why the fluctuating pressures change with the tip *** strong fluctuations of duct-surface pressures are caused by intensive tip separation *** duct-surface pressure fluctuations are effectively reduced by using the rake distribution near the tip towards blade back side and,for the combination of the five-bladed rotor and the seven-bladed stator,the resultant unsteady horizontal(and vertical)forces acting on the duct and stator are also reduced;while increasing rake leads to negative effect on pressure fluctuations and unsteady horizontal(and vertical)forces acting on all the components of the propulsor.

关键词： Pump-jet tip-clearance tip-rake fluctuating pressures excitation forces

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不同植物生长调节剂及其与Mo、维生素C配施对烤烟农艺性状和化学成分的影响

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安徽农业大学学报 2005年第3期32卷 273-277页

作者：武丽徐晓燕李章海黄义德季学军周初跃王程辉中国科技大学地球与空间科学学院合肥230026 安徽农业大学农学院合肥230036 皖南烟草公司宣城242000 蚌埠卷烟厂蚌埠233010

研究了不同的植物生长调节剂萘乙酸(NAA)、赤霉素(GA)、生长素(IAA)及其与钼(Mo)、维生素C(Vc)配施对烟草农艺性状和化学成分的影响。结果表明,喷施后明显促进了烟草生长发育,倒一叶的叶长、叶宽和叶面积最大增幅分别达15.24%、34.23%和... 详细信息

研究了不同的植物生长调节剂萘乙酸(NAA)、赤霉素(GA)、生长素(IAA)及其与钼(Mo)、维生素C(Vc)配施对烟草农艺性状和化学成分的影响。结果表明,喷施后明显促进了烟草生长发育,倒一叶的叶长、叶宽和叶面积最大增幅分别达15.24%、34.23%和57.98%,倒十叶的叶长、叶宽和叶面积最大增幅分别达9.74%、17.31%和29.85%;株高比对照增幅达19.07%,产量提高也较为显著;还原糖含量略有提高,烟碱含量降低显著,对多酚含量影响较小。处理中以NAA+GA+IAA+Mo和NAA+GA+IAA+ABA效果最佳,降碱效果显著,两糖差分别为3.50%和3.97%,糖碱比为7.80和7.96,协调了化学成分。

关键词：烤烟生长调节剂 Mo,维生素C 农艺性状化学成分

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High-energy-density gelled fuels with high stability and shear thinning performance

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Chinese Journal of Chemical Engineering 2022年第3期35卷 99-109页

作者： Yang Liu Hongzhi Zhang Lun Pan Kang xue Xiangwen Zhang ji-jun Zou Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Collaborative Innovative Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China Zhejiang Institute of Tianjin University Ningbo 315201China

Gelled fuels are the very promising propellants for new-generation rocket and ramjet *** we report a new type of low-molecular mass organic gellant(Z),and prepared four kinds of stable gelled fuels based on HD-01,HD-03,RP-3 and QC liquid fuels,with the critical gellant concentration less than 1%(mass).The characterizations show that the gellant can form 3D network structure,via hydrogen bonding,π-πstacking and van der Waals forces,to fix fuel molecules during the formation of gelled ***,the gelled fuels show high stability,with the remaining gel mass of 0.25%(mass)Z/HD-01 more than 90%even at high centrifugal speed of 7500 r·min^(-1),but the rheological property test shows that all gelled fuels have obvious shear thinning property,which benefits its storage in gelled state while supply in liquid *** gelation of liquid fuels by gellant Z can increase the volumetric net heat of combustion(for HD-01,it increases from 39.58 MJ·L^(-1) to 40.76 MJ·L^(-1) with 1%(mass)Z),and liquefied gelled fuels show the comparable ignition delay time with the pristine liquid ***,the gelled fuels made by gellant Z have better stability,shear thinning and combustion performances,which have great potential for the practical application.

关键词： High-performance fuel Gelled fuel Gellants Fuel properties

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Coupling effect of the conductivities of Li ions and electrons by introducing LLTO@C fibers in the LiNi0.8Co0.15Al0.05O2 cathode

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International Journal of Minerals,Metallurgy and Materials 2021年第2期28卷 305-316页

作者： Hao-yang Wang xue Cheng Xiao-feng Li ji-min Pan jun-hua Hu School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China State Center for International Cooperation on Designer Low-carbon&Environmental Materials(CDLCEM) Zhengzhou UniversityZhengzhou 450001China Zhengzhou Materials Genome Institute(ZMGI) Xingyang 450100China

To probe the coupling effect of the electron and Li ion conductivities in Ni-rich layered materials(LiNi0.8Co0.15Al0.05O2,NCA),lithium lanthanum titanate(LLTO)nanofiber and carbon-coated LLTO fiber(LLTO@C)materials were introduced to polyvinylidene difluoride in a *** enhancement of the conductivity was indicated by the suppressed impedance and *** 1 and 5 C,the cathodes with coupling conductive paths had a more stable cycling *** coupling mechanism was analyzed based on the chemical state and structure evolution of NCA after cycling for 200 cycles at 5 *** the pristine cathode,the propagation of lattice damaged regions,which consist of high-density edge-dislocation walls,destroyed the bulk integrity of *** addition,the formation of a rock-salt phase on the surface of NCA caused a capacity *** contrast,in the LLTO@C modified cathode,although the formation of dislocation-driven atomic lattice broken regions and cation mixing occurred,they were limited to a scale of several atoms,which retarded the generation of the rock-salt phase and resulted in a pre-eminent capacity *** NiO phase“pitting”occurred.A mechanism based on the synergistic transport of Li ions and electrons was proposed.

关键词： Ni-rich cathode coupling mechanism dislocation wall coaxial structure cation mixing

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Enhancing photocatalytic hydrogen peroxide production of Tibased metal-organic frameworks:The leading role of facet engineering

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Nano Research 2022年第7期15卷 6045-6053页

作者： xue-Yang ji Yao-Yao Wang Yun Li Ke Sun Meng Yu jun Tao Key Laboratory of Cluster Science of Ministry of Education School of Chemistry and Chemical EngineeringLiangxiang CampusBeijing Institute of TechnologyBeijing 102488China

Rational construction of the facet engineering over metal-organic frameworks is of significant interest for enhancing photocatalytic performance,yet the role of modulator except regulating facet is largely ***,facet engineering of NH_(2)-MIL125(aMIL)was achieved through the facile one-pot method by controlling the concentration of acetic acid *** probable domino effects induced with the detectable modulator were extensively investigated,evidencing the multi-position in one mode contained powder X-Ray diffraction(PXRD),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),and X-ray absorption spectroscopy(XAS),***,correlation among the{111}facets engineering,the degree of structural defects,and the performance of photocatalytic hydrogen peroxide(H_(2)O_(2))production was studied in detail,revealing that facet and defect engineering respectively play positive and relatively negative roles in the photocatalytic oxygen reduction reaction(ORR)with a volcano-type ***-3 photocatalyst could deliver H_(2)O_(2) production rate of 925.8μmol·h^(−1)·g^(−1)(2.03-fold of aMIL)under visible-light irradiation and a quantum yield of 1.08%at 420 nm.

关键词： metal-organic frameworks facet engineering defects photocatalyst hydrogen peroxide production

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MicroRNA-125b Accelerates and Promotes PML-RARa-driven Murine Acute Promyelocytic Leukemia

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Biomedical and Environmental Sciences 2022年第6期35卷 485-493页

作者： GUO Bo QIN Ran CHEN ji jun PAN Wen LU xue Chun Department of Hematology The Second Medical Centre&National Clinical Research Center for Geriatric DiseasesChinese PLA General HospitalBeijing 100853China Department of Genetics Yale University School of MedicineNew HavenConnecticut 06510USA Yale Stem Cell Center Yale Cancer CenterNew HavenCT06520USA

Objective Most acute promyelocytic leukemia cases are characterized by the PML-RARa fusion oncogene and low white cell counts in peripheral *** Based on the frequent overexpression of miR-125-family miRNAs in acute promyelocytic leukemia,we examined the consequence of this phenomenon by using an inducible mouse model overexpressing human *** MiR-125b expression significantly accelerates PML-RARa-induced leukemogenesis,with the resultant induced leukemia being partially dependent on continued miR-125b ***,miR-125b expression led to low peripheral white cell counts to bone marrow blast percentage ratio,confirming the clinical observation in acute promyelocytic leukemia *** This study suggests that dysregulated miR-125b expression is actively involved in disease progression and pathophysiology of acute promyelocytic leukemia,indicating that targeting miR-125b may represent a new therapeutic option for acute promyelocytic leukemia.

关键词： miR-125b PML-RARA White blood cell Bone marrow blast

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皖南特色烟在旌德县的试种初探

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土壤 2010年第5期42卷 855-856页

作者：杨庆福李贤胜杨平祖朝龙王大州季学军沈思灯李德成旌德县农技推广中心安徽旌德242600 宣城市土肥站安徽宣城242000 安徽省农业科学院烟草研究所合肥230031 安徽皖南烟叶有限责任公司安徽宣城242000 土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所) 南京210008

根据对皖南旌德县气候和土壤等自然条件的初步判断,认为其适宜种植特色烟,为此于2007年起在旌德县某村进行了试种探索。结果表明,发育于花岗岩风化物母质的耕作土壤,特色烟在长势、产量、品质和效益方面均表现良好,值得在全县适度发展... 详细信息

根据对皖南旌德县气候和土壤等自然条件的初步判断,认为其适宜种植特色烟,为此于2007年起在旌德县某村进行了试种探索。结果表明,发育于花岗岩风化物母质的耕作土壤,特色烟在长势、产量、品质和效益方面均表现良好,值得在全县适度发展种植。

关键词：特色烟试种旌德县花岗岩风化物母质

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Selective cleavage of phenolic tert-butyldimethylsilyl ethers using simple organic nitrogen bases

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Chinese Chemical Letters 2010年第3期21卷 273-276页

作者： Zhu, jian Rong xue, ji jun Lib, Wen Ze Chen, xue Song Li, Ying Lanzhou Univ State Key Lab Appl Organ Chem Lanzhou 730000 Peoples R China Zhejiang jiuzhou Pharmaceut Co Ltd Jiaojiang Taizhou City 318000 Zhejiang Peoples R China

Simple organic nitrogen bases,such as Et_3N,pyridine,DBU,etc.,were found to be convenient and useful reagents for deprotection of TBDMS groups on acidic hydroxyl *** efficiency of these bases has an apparent order:1°amine>2°amine>3°amine and aliphatic base>aromatic *** aqueous DMSO and at room temperature,phenolic TBDMS ethers were removed selectively in the presence of alcoholic TBDMS *** catalytic base can make these reactions *** method is high-yielding,fast,clean,saf...

关键词： Selective cleavage Phenolic tert-butyldimethylsilyl ethers Organic nitrogen bases

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Modeling the Correlations of Relations for Knowledge Graph Embedding

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Journal of Computer Science & Technology 2018年第2期33卷 323-334页

作者： ji-Zhao Zhu Yan-Tao jia jun Xu jian-Zhong Qiao xue-Qi Cheng College of Computer Science and Engineering Northeastern University Shenyang 110169 China Key Laboratory of Network Data Science and Technology Institute of Computing Technology Chinese Academy of Sciences Beijing 110190 China

Knowledge graph embedding, which maps the entities and relations into low-dimensional vector spaces, has demonstrated its effectiveness in many tasks such as link prediction and relation extraction. Typical methods include TransE, TransH, and TransR. All these methods map different relations into the vector space separately and the intrinsic correlations of these relations are ignored. It is obvious that there exist some correlations among relations because different relations may connect to a common entity. For example, the triples （Steve Jobs, PlaceOfBrith, California） and （Apple Inc., Location, California） share the same entity California as their tail entity. We analyze the embedded relation matrices learned by TransE/TransH/TransR, and find that the correlations of relations do exist and they are showed as low-rank structure over the embedded relation matrix. It is natural to ask whether we can leverage these correlations to learn better embeddings for the entities and relations in a knowledge graph. In this paper, we propose to learn the embedded relation matrix by decomposing it as a product of two low-dimensional matrices, for characterizing the low-rank structure. The proposed method, called TransCoRe （Translation-Based Method via Modeling the Correlations of Relations）, learns the embeddings of entities and relations with translation-based framework. Experimental results based on the benchmark datasets of WordNet and Freebase demonstrate that our method outperforms the typical baselines on link prediction and triple classification tasks.

关键词： knowledge graph embedding low-rank matrix decomposition

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Magnetostriction and magnetization of <110> oriented Tb0.27Dy0.73Fe1.95 alloys with different compressive prestresses

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Rare Metals 2020年第2期39卷 176-180页

作者： Xing Mu Hai-jun Tang xue-Xu Gao Xiao-Qian Bao ji-Heng Li State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing100083China China Academy of Civil Aviation Science and Technology Beijing100028China

oriented Tb0.27Dy0.73Fe1.95 alloys were studied under different applied compressive *** saturation magnetostriction by 500×10-6 is obtained for the sample under 5 MPa than that under no applied *** understand the effect of prestress on the magnetostrictive coefficient,differential magnetostrictive coefficient,relative permeability and coercive force were studied in *** results show that the maximum differential magnetostrictive coefficient is about 37 x 10-9 m·A-1,about two times that without *** addition,the saturation magnetostriction coefficient increases gradually with the stress increasing,while the maximum differential magnetostrictive coefficient *** saturation inductions under different stresses are similar to a value of about 1.1 *** relative permeability decreases with stress increasing.

关键词： Tb-Dy-Fe Compressive prestress Magnetostriction

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