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Inf.uence of.Design Parameters on Cogging Torque in Directly Driven Permanent Magnet Synchronous Wind Generators

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Journal of.Energy and Power Engineering 2010年第7期4卷 42-47页

作者： Q.L. Deng S.D. Huang f. xiao Institute of.Electric and Inf.rmation Engineering Hunan University Changsha 410082 China Dept. of.Electric and Inf.rmation Engineering Hunan Institute of Engineering Xiangtan 411101 China

In order to reduce the cogging torque, this paper investigates the inf.uence of.some parameters on the cogging torque developed by directly driven permanent magnet synchronous wind generators. Based on the remanent magnetic f.ux densities, the cogging torque is computed by using f.nite element method. It is shown that many parameters have inf.uence on cogging torque and the slot and pole number combination has a signif.cant ef.ect on cogging torque. A simple f.ctor has been introduced to indicate the ef.ect of.the slot and pole number combination. Some practical experience to reduce the cogging torque was applied to 2 MW three phase permanent magnet synchronous generator at rated speed of.37.5 rpm f.r wind energy conversion. The simulation and experiment results verif. the ef.ect of.the proposed method.

关键词： Cogging torque permanent magnet synchronous generator electric machine design.

New evidence f.r the epigenetic regulation of.skeletal stem cells

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Science Bulletin 2024年第13期69卷 2004-2006页

作者： Liming Zhao Jun xiao Charles K.f.Chan Institute f.r Stem Cell Biology and Regenerative Medicine Stanford University School of MedicineStanford CA 94305USA Department of.Surgery Division of Plastic and Reconstructive SurgeryStanford University School of MedicineStanford CA 94305USA Department of.Orthopaedic Surgery Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China

Skeletal stem cells(SSCs)are crucial f.r skeletal development and regeneration,yet the epigenetic regulation of.these cells remains poorly *** studies have delineated the epigenetic landscape across the developmental trajectory of.SSCs,highlighting the involvement of.Ptip in regulating SSC *** skeletal system undergoes dynamic remodeling throughout *** stem cells(SSCs),residing within the skeleton and lineage-restricted,serve as a cellular reserve to f.ster development and maintain skeletal *** categorized within the broader mesenchymal stromal/stem cells(MSCs).

关键词： skeletal involvement maintain

Rescattering of.stimulated Raman side scattering in nonunif.rm plasmas

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Matter and Radiation at Extremes 2024年第5期9卷 68-76页

作者： S.Tan Q.Wang Y.Chen W.B.Yao C.Z.xiao J.f.Myatt School of.Physics and Electronics Hunan UniversityChangsha 410082China Institute of.Applied Physics and Computational Mathematics Beijing 100094China School of.Electrical and Inf.rmation Engineering Anhui University of Science and TechnologyHuainanAnhui 232001China Department of.Electrical and Computer Engineering University of Alberta9211116 St.NWEdmontonAlberta T6G 1H9Canada

Rescattering of.stimulated Raman side scattering(SRSS)is observed f.r the f.rst time via two-dimensional(2D)particle-in-cell(PIC)*** construct a theoretical model f.r the rescattering process,which can predict the region of.occurrence of.mth-order SRSS and estimate its *** rescattering process is identif.ed by the 2D PIC simulations under typical conditions of.a direct-drive inertial conf.nement f.sion *** electrons produced by second-order SRSS propagate nearly perpendicular to the density gradient and gain nearly the same energy as in f.rst-order SRSS,but there is no cascade acceleration to produce superhot *** studies f.r a wide range of.ignition conditions show that SRSS and associated rescatterings are robust and important processes in inertial conf.nement f.sion.

关键词： nonunif.rm acceleration scattering

An intrinsically self.healing and anti-f.eezing molecular chains induced polyacrylamide-based hydrogel electrolytes f.r zinc manganese dioxide batteries

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Journal of.Energy Chemistry 2024年第2期89卷 565-578,I0013页

作者： Haiyang Liao Wenzhao Zhong Chen Li Jieling Han xiao Sun Xinhui Xia Ting Li Abolhassan Noori Mir f.Mousavi Xin Liu Yongqi Zhang Institute of.f.ndamental and f.ontier Sciences University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina School of.Mechanical Engineering Hunan University of TechnologyZhuzhou 412007HunanChina School of.Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014ZhejiangChina Department of.Chemistry Faculty of Basic SciencesTarbiat Modares UniversityTehran 14117-13116Iran State Key Laboratory of.New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200HubeiChina

The anti-f.eezing strategy of.hydrogels and their self.healing structure are of.en contradictory,it is vital to break through the molecular structure to design and construct hydrogels with intrinsic anti-f.eezing/self.healing f.r meeting the rapid development of.f.exible and wearable devices in diverse service ***,we design a new hydrogel electrolyte(Af.SH-Hydrogel)with intrinsic anti-f.eezing/self.healing capabilities by introducing ethylene glycol molecules,dynamic chemical bonding(disulf.de bond),and supramolecular interaction(multi-hydrogen bond)into the polyacrylamide molecular *** to the exceptional f.eeze resistance(84%capacity retention at-20℃)and intrinsic self.healing capabilities(95%capacity retention af.er 5 cutting/self.healing cycles),the obtained Af.SH-Hydrogel makes the zinc||manganese dioxide cell an economically f.asible battery f.r the state-of.the-art *** Zn||Af.SH-Hydrogel||MnO_(2)device of.ers a near-theoretical specif.c capacity of.285 m A h g^(-1)at 0.1 A g^(-1)(Coulombic ef.iciency≈100%),as well as good self.healing capability and mechanical f.exibility in an ice *** work provides insight that can be utilized to develop multif.nctional hydrogel electrolytes f.r application in next generation of.self.healable and f.eeze-resistance smart aqueous energy storage devices.

关键词： f.exible aqueous battery Hydrogel electrolyte Anti-f.eezing Self.healing Dual-dynamic reversible bond

A Generalized MSST Algorithm f.r Counting Points of.Elliptic Curves over f.(p)^(n)

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Journal of.Systems Science & Complexity 2024年第4期37卷 1738-1754页

作者： LI xiao LV Chang PAN Zhizhong Key Laboratory of.Cyberspace Security Def.nse Institute of Information EngineeringChinese Academy of SciencesBeijing 100085China School of.Cyber Security University of Chinese Academy of SciencesBeijing 100085China Huawei Technologies Co. Ltd.Shenzhen 518129China

Elliptic curve cryptography is an important part of.nowaday's public key *** points of.elliptic curves over f.nite f.elds is of.great signif.cance to the selection of.saf.ty *** present,there are many p-adic algorithms,such as SST algorithm,generalized AGM algorithm,Kedlaya algorithm,etc.,which can deal with the situation of.f.nite f.elds of.small *** this paper,the authors generalize the MSST algorithm of.characteristic 2 to general f.elds of.odd characteristic,and propose the generalized MSST *** generalized MSST algorithm is achieved by combining the advantages of.the SST algorithm and the generalized AGM *** the time complexity of.the multiplication of.two n-bit numbers is denoted as O((n)^(μ)),then the time complexity of.the generalized MSST algorithm is O(n^(2μ+1/1+μ)),which is the same as the improved SST *** practical experiments,the running time of.the generalized MSST algorithm is less than that of.the improved SST algorithm.

关键词： Elliptic curve generalized AGM algorithm generalized MSST algorithm SST algorithm

Berry-Esseen bounds and moderate deviations f.r the norm, entries and spectral radius of.products of.positive random matrices

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Science China Mathematics 2024年第3期67卷 627-646页

作者： Hui xiao Ion Grama Quansheng Liu Institut f.r Mathematik und Angewandte Inf.rmatik Universitat HildesheimHildesheim 31141Germany Academy of.Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190China LMBA Universite Bretagne SudCNRS UMR 6205Vannes F-56000France

Let(g_(n))_(n≥1) be a sequence of.independent and identically distributed positive random d×d matrices and consider the matrix product G_(n)=g_(n)…g_*** suitable conditions,we establish the Berry-Esseen bounds on the rate of.convergence in the central limit theorem and Cramer-type moderate deviation expansions,f.r any matrix norm ‖G_(n)‖ of.G_(n),its entries G_(n)^(i,j) and its spectral radius ρ(G_(n)).Extended versions of.their joint law with the direction of.the random walk G_(n)x are also established,where x is a starting point in the unit sphere of.R~d.

关键词： Berry-Esseen bound Cramér-type moderate deviation product of.random matrices operator norm entry spectral radius

Uniqueness on Dif.erence Operators of.Meromorphic f.nctions of.Inf.nite Order

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Acta Mathematica Sinica,English Series 2024年第2期40卷 511-527页

作者： Hui LI Ming Liang f.NG xiao YAO School of.Science China University of Mining and TechnologyBeijing 100083P.R.China Institute of.Mathematics Academy of Mathematics and System SciencesChinese Academy of SciencesBeijing 100190P.R.China School of.Sciences Hangzhou Dianzi UniversityHangzhou 310012P.R.China School of.Mathematical sciences and LPMC Nankai UniversityTianjin 300071P.R.China

We investigate the uniqueness problems of.meromorphic f.nctions and their dif.erence operators by using a new *** is proved that if.a non-constant meromorphic f.nction f.shares a non-zero constant and ∞ counting multiplicities with its dif.erence operators Δcf.z) and Δ_(c)^(2)f.z), thenΔcf.z)≡Δ_(c)^(2)f.z).In particular,we give a dif.erence analogue of.a result of.*** method has two distinct f.atures:(ⅰ) It converts the relations between f.nctions into the corresponding *** makes it possible to deal with the uniqueness problem by linear algebra and combinatorics.(ⅱ) It circumvents the obstacle of.the dif.erence logarithmic derivative lemma f.r meromorphic f.nctions of.inf.nite order,since this method does not depend on the growth of.the ***,the idea in this paper can also be applied to the case f.r several variables.

关键词： Uniqueness meromorphic f.nctions dif.erence operators inf.nite order

The extraction of.ef.ective components and an antioxidant activity study of.Tulipa edulis

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f.od Science and Human Wellness 2024年第1期13卷 276-286页

作者： Doudou Zhang Dong xiao Tingting Yin Shuangzhi Zhao Olena Zhur Xun xiao Hailun He Leilei Chen Beijing Advanced Innovation Center f.r f.od Nutrition and Human Health Beijing Technology and Business UniversityBeijing 102488China School of.Lif. Sciences Central South UniversityChangsha 410013China State Key Laboratory of.Coal Resources and Saf. Mining University of Mining and TechnologyXuzhou 221116China Institute of.Agro-f.od Science and Technology Shandong Academy of Agricultural SciencesJinan 250100China

Plant extracts f.om natural sources are an excellent choice f.r f.od additives and natural *** this study,the active components of.Tulipa edulis were extracted and analysed,and their antioxidant capacity was ***,the crude extract mixture was separated and purif.ed using a Sephadex LH-20 gel,and the antioxidant activity of.the purif.ed products was *** umbilical vein endothelial human umbilical vein endothelial cells(HUVEC)cells were treated with 35 mmol/L glucose to construct a model of.oxidative ***,the cells were treated with the active component to observe whether the products of.*** could have a good protective ef.ect on HUVEC cells induced by *** analysis was also perf.rmed on HUVEC cells af.er same treatment to explore the possible mechanism of.the component f. protecting HUVEC cells f.om oxidative stress induced by high *** results showed that component f. obtained f.om *** has strong antioxidant ***,f. can play a strong antioxidant protective role in HUVEC ***,the gene expression of.heme oxygenase 1(HO-1),γ-glutamyl cysteine ligase catalytic subunit(GCLC)and NAD(P)H quinone oxidoreductase-1(NQO1)in HUVEC cells was up-regulated af.er treated with *** study provides ref.rence value f.r the f.rther development and application of.*** and the d evelopment of.f.nctional f.od.

关键词： Tulipa edulis Oxidative stress Purif.cation Antioxidant

Dielectric Polarization of.Ba2Ti9O20 Ceramics f.r Microwave Applications

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Dielectric Polarization of Ba2Ti9O20 Ceramics for Microwave ...