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Krill oil ameliorates benign prostatic hyperplasia by regulating G1-phase cell cycle arrest and altering signaling pathways and benign prostatic hyperplasia-associated markers
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作者 Hoon Kim Jongyeob Kim +10 位作者 Byungdoo Hwang Sang Yong Park Ji-Yeon Shin Eun Byeol Go Jae Sil Kim Youngjin Roh Soon Chul Myung Seok-Joong Yun Yung Hyun Choi Wun-Jae Kim Sung-Kwon Moon 《Food Science and Human Wellness》 SCIE CAS CSCD 2024年第6期3311-3324,共14页
Krill oil(KO)exhibits various biological activities,such as anti-inflammatory and antitumor effects.However,the inhibitory effects of benign prostatic hyperplasia(BPH)in vitro and in vivo have not yet been studied.Thi... Krill oil(KO)exhibits various biological activities,such as anti-inflammatory and antitumor effects.However,the inhibitory effects of benign prostatic hyperplasia(BPH)in vitro and in vivo have not yet been studied.This study investigated the anti-BPH effects of KO extracted by an enzymatic hydrolysis method.KO treatment inhibited the proliferation of WMPY-1 and BPH-1 cells by induction of G0/G1 phase arrest through the modulation of positive and negative regulators in both prostate cell types.KO treatment stimulated phosphorylation of c-Jun N-terminal kinase(JNK)and p38 signaling.In addition,KO changed the expression of BPH-related markers(5α-reductase,androgen receptor,FGF,Bcl-2,and Bax)and the activity of the proliferation-mediated NF-κB binding motif.KO-induced levels of proliferation-mediated molecules of prostate cells were attenuated in the presence of siRNA-specific p-38(si-p38)and JNK(si-JNK).Furthermore,the administration of KO alleviated prostate size and weight and the cell layer thickness of prostate glands in a testosterone enanthate-induced BPH rat model.KO treatment altered the level of dihydrotestosterone in serum and the expression levels of BPH-related markers in prostate tissues.Finally,KO-mediated inhibition of prostatic growth was validated by histological analysis.These results suggest that KO has an inhibitory effect on BPH in prostate cells in vitro and in vivo.Thus,KO might be a potential prophylactic or therapeutic agent for patients with BPH. 展开更多
关键词 Proliferation G0/G1-phase cell cycle NF-κB DIHYDROTESTOSTERONE
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Melting Flow Analyzation of Radiative Riga Plate Two-Phase Nano-Fluid Across Non-Flatness Plane with Chemical Reaction
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作者 Jupudi Lakshmi Rama Prasad F.Mebarek-Oudina +2 位作者 G.Dharmaiah Putta Babu Rao H.Vaidya 《Frontiers in Heat and Mass Transfer》 EI 2024年第5期1515-1532,共18页
There is a strong relationship between analytical and numerical heat transfers due to thermodynamically anticipated findings,making thermo-dynamical modeling an effective tool for estimating the ideal melting point of... There is a strong relationship between analytical and numerical heat transfers due to thermodynamically anticipated findings,making thermo-dynamical modeling an effective tool for estimating the ideal melting point of heat transfer.Under certain assumptions,the present study builds a mathematical model of melting heat transport nanofluid flow of chemical reactions and joule heating.Nanofluid flow is described by higher-order partial non-linear differential equations.Incorporating suitable similarity transformations and dimensionless parameters converts these controlling partial differential equations into the non-linear ordinary differential equations and resulting system of nonlinear equations is established.Plotted graphic visualizations in MATLAB allow for an indepth analysis of the effects of distinguishing factors on fluid flow.Innovative applications of the findings include electronic cooling,heat transfer,reaction processes,nuclear reactors,micro heat pipes,and other related fields.If the exponential index increases,however,the thermal profile becomes worse.By comparing the current findings to those already published in the literature for this particular example,we find that they are highly congruent,therefore validating the present work.Every one of the numerical findings exhibits asymptotic behavior by meeting the specified boundary conditions. 展开更多
关键词 Non-flat sheet melting surface chemical reaction 2-phase nano fluid
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ON A UNIVERSAL INEQUALITY FOR APPROXIMATE PHASE ISOMETRIES
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作者 戴端旭 阙海新 +1 位作者 孙龙发 郑本拓 《Acta Mathematica Scientia》 SCIE CSCD 2024年第3期823-838,共16页
Let X and Y be two normed spaces.Let U be a non-principal ultrafilter on N.Let g:X→Y be a standard ε-phase isometry for someε≥ 0,i.e.,g(0)=0,and for all u.v ∈ X,||‖g(u)+g(v)‖±‖g(u)-g(v)‖|-|‖u+v‖±... Let X and Y be two normed spaces.Let U be a non-principal ultrafilter on N.Let g:X→Y be a standard ε-phase isometry for someε≥ 0,i.e.,g(0)=0,and for all u.v ∈ X,||‖g(u)+g(v)‖±‖g(u)-g(v)‖|-|‖u+v‖±‖u-v‖| |≤ε.The mapping g is said to be a phase isometry provided that ε=0.In this paper,we show the following universal inequality of g:for each u^(*) ∈ w^(*)-exp ‖u^(*)‖B_(x^(*)),there exist a phase function σ_(u^(*)):X→{-1,1} and φ ∈ Y^(*) with ‖φ‖=‖u^(*)‖≡α satisfying that|(u^(*),u)-σ_(u^(*))(u)<φ,g(u)>)|≤5/2εα,for all u ∈ X.In particular,let X be a smooth Banach space.Then we show the following:(1) the universal inequality holds for all u^(*) ∈ X^(*);(2) the constant 5/2 can be reduced to 3/2 provided that Y~*is strictly convex;(3) the existence of such a g implies the existence of a phase isometryΘ:X→Y such that■ provided that Y^(**) has the w^(*)-Kadec-Klee property(for example,Y is both reflexive and locally uniformly convex). 展开更多
关键词 ε-phase isometry phase isometry Banach space
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Coercive Force of γ-Phase in WC-Co Cemented Carbides 被引量:1
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作者 刘寿荣 孙景 《Rare Metals》 SCIE EI CAS CSCD 1994年第4期299-301,共3页
The influence of γ-phase composition in WC-Co cemented carbides on its specific coercive force H_(sc) hasbeen studied by analysing the imitative alloys of γ-phase. The results show that the H_(sc) of γ-phase is low... The influence of γ-phase composition in WC-Co cemented carbides on its specific coercive force H_(sc) hasbeen studied by analysing the imitative alloys of γ-phase. The results show that the H_(sc) of γ-phase is lower thanthat of pure cobalt, because the solute W can raise γ-phase H_(sc) but the carbon exhibits more intense negativeeffect on H_(sc). The effect is enhanced with raising the C solubilities in γ-phase. 展开更多
关键词 WC-Co cemented carbides γ-phase Specific coercive force
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Characterization of a 3-Phase a.c. Free Burning Arc Plasma 被引量:1
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作者 夏维东 Laurent FULCHERI +2 位作者 Jose GONZALEZ-AGUILAR 李辉 Thomas M. GRUENBERGER 《Plasma Science and Technology》 SCIE EI CAS CSCD 2006年第2期156-163,共8页
A 3-phase a.c. arc plasma reactor with large volume plasma has been developed for the synthesis of new carbon nano-structures. One of the main characteristics of the plasma system is related to the absence of a fixed ... A 3-phase a.c. arc plasma reactor with large volume plasma has been developed for the synthesis of new carbon nano-structures. One of the main characteristics of the plasma system is related to the absence of a fixed neutral point. This gives rise to a rich and complex phenomenology related to instabilities and arc motion since the arcs are "burning" freely in the gas flow between the three electrodes. This paper is dedicated to the analysis of the behavior of such a system under typical conditions using argon and nitrogen as plasma gases. A classification of are configuration, arc commutating, arc interaction, arc motion and arc instabilities are discussed based on ultra high-speed cine camera analysis. A simple model describing the time evolution of the system is also presented and compared with the experimental measurements. The results show that an adequate control could allow the improvement of the overall system. 展开更多
关键词 3-phase AC arc plasma free arc arc motion arc commutating arc instabilities
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Hyperbranched phthalocyanine enabling black-phase formamidinium perovskite solar cells processing and operating in humidity open air 被引量:1
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作者 Rong Li Jiale Ding +6 位作者 Xijiao Mu Yifei Kang Anran Wang Weihui Bi Yunhe Zhang Jing Cao Qingfeng Dong 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第8期141-149,I0005,共10页
The extreme instability of pureα-phase FAPbI_(3) under high humidity conditions restricts the highthroughput fabrication in unmodified air environments,resulting in poor performance ofα-phase FAPbI_(3) perovskite de... The extreme instability of pureα-phase FAPbI_(3) under high humidity conditions restricts the highthroughput fabrication in unmodified air environments,resulting in poor performance ofα-phase FAPbI_(3) perovskite devices obtained by scalable fabrication methods.Here we synthesized hyperbranched copper phthalocyanine(HCuPc)as a supramolecular additive with twisted phthalocyanine units to realize the molecular-level encapsulation at the grain boundaries through supramolecular interaction,which greatly broadened the processing window of FAPbI_(3) under high humidity.At the same time,unlike traditional encapsulation layer that carrier can only be collected by tunneling effect,the twisted phthalocyanine ring of HCu Pc in perovskite films is more conducive to hole extraction.Finally,a record efficiency was achieved in pure FAPbI_(3) based inverted structured solar cell by blade-coating to the best of our knowledge,even under unmodified humid air conditions(relative humidity of 65%–85%).The best operational stability of 3D pure FAPbI_(3) devices can also be achieved at the same time and unencapsulated HCuPc-FAPbI_(3) device can even operate with negligible degradation for 100 h in the open air(RH 30%–40%). 展开更多
关键词 Perovskite solar cells α-phase FAPbI_(3) Blade coating Humid air stability Copper phthalocyanine
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ON THE PRIMARY η-PHASE IN A HIGH-Ti Ni-Fe-Cr BASED SUPERALLOY
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作者 GUO Shouren LU Dezhong Institute of Metal Research,Academia Sinica,Shenyang,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1992年第3期172-177,共6页
The precipitation and dissolution together with their control of the primary η-phase in a high-Ti Ni-Fe-Cr base superalloy have been investigated.The precipitation of primary η-phase was found to be closely related ... The precipitation and dissolution together with their control of the primary η-phase in a high-Ti Ni-Fe-Cr base superalloy have been investigated.The precipitation of primary η-phase was found to be closely related to Ti or Al content and solidification rate of the alloy. The aggregation of blocky η-phase may remarkably reduce the tensile strength,ductility and rupture life of the alloy.The temperature-time relation of dissolution of the primary η-phase obeys T=1370-86.1 lgt for as-cast superalloy.The formation of primary η-phase may be prevented by the reasonable control of Ti or Al content and smelting process.The adoption of treatment under large hot deformation and homogenization may be the remedy for unfavorable influence of η-phase. 展开更多
关键词 SUPERALLOY primary η-phase TI HOMOGENIZATION
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EFFECTS OF DEFORMATION ON MICROSTRUCTURE AND σ-PHASE FORMATION IN Cr_(25)Ni_(20) STAINLESS STEEL
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作者 GAO Yan LI Dejun CAO Zhiben Dalian University of Science and Technology,Dalian,Liaoning,China LI Dejun,Lecturer,Department of Materials Engineering,Dalian University of Science and Technology,Dalian,Liaoning,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1989年第2期157-159,共3页
The microstructure of Cr_(25)Ni_(20)stainless steel under plastic deformation up to 50% has re- vealed an even distributed twins,micro-twins and deformation bands.The σ-phase formation in 800℃ aged specimens is acce... The microstructure of Cr_(25)Ni_(20)stainless steel under plastic deformation up to 50% has re- vealed an even distributed twins,micro-twins and deformation bands.The σ-phase formation in 800℃ aged specimens is accelerated by its nucleation at either deformation twins or recrystallized grain boundaries under less or more deformation respectively.In the recrystallized zone,the recrystallization is prior to the precipitation of σ-phase.Although recrystallization may accelerate the formation of σ-phase,it is not essential.The twins and micro-twins produced by deformation may also provide the additional nucleation sites. 展开更多
关键词 plastic deformation α-phase RECRYSTALLIZATION
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Numerical Method for Heat and Mass Transfer in Air Washer——3.Two-phase Flow in Eliminator
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作者 倪波 《Journal of China Textile University(English Edition)》 EI CAS 2000年第2期77-80,共4页
Numerical simulation method is applied in the study oftwo - phase flow dynamics in the eliminator of air wash-er. The carrier phase (air) is treated in Eulerian frame,the water droplets are tracked in the Lagrangian f... Numerical simulation method is applied in the study oftwo - phase flow dynamics in the eliminator of air wash-er. The carrier phase (air) is treated in Eulerian frame,the water droplets are tracked in the Lagrangian frame.A three - dimensional unsteady two - phase flow model isdeveloped. With the help of FLUENT software, air-stream velocity field and water droplets trajectories havebeen illustrated when their mixture passing through tra-ditional folded eliminator. The result of the simulationcan be used to investigate the mechanism of 展开更多
关键词 AIR WASHER eliminator DROP trajectories two -phase flow.
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A new design of stator magnetic system for 3-phase & 12-pole HB stepper
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作者 任雷 史敬灼 王宗培 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 1999年第3期52-56,共5页
A new design of stato magnetic System is Proposed for 3-phase & 12-pole HB stepper, and it features bet-ter distribution of magntic lield to incare Pullou tope and bopmve Operaonal stability of moor and minimummut... A new design of stato magnetic System is Proposed for 3-phase & 12-pole HB stepper, and it features bet-ter distribution of magntic lield to incare Pullou tope and bopmve Operaonal stability of moor and minimummutual inductance between phase windimp to make design of control circuit easier, and application proved it is as good as expected. 展开更多
关键词 HB STEPPER STATOR MAGNETIC system 3-phase STEPPER
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Improvement of β-phase crystal formation in a BaTiO3-modified PVDF membrane
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作者 Lin SHEN Lei GONG +3 位作者 Shuhua CHEN Shiping ZHAN Cheng ZHANG Tao SHAO 《Plasma Science and Technology》 SCIE EI CAS CSCD 2018年第6期144-151,共8页
In this paper,low temperature plasma is used to modify the surface of barium titanate(BaTiO3)nanoparticles in order to enhance the interfacial compatibility between ferroelectric poly(vinylidene fluoride)(PVDF) ... In this paper,low temperature plasma is used to modify the surface of barium titanate(BaTiO3)nanoparticles in order to enhance the interfacial compatibility between ferroelectric poly(vinylidene fluoride)(PVDF) and BaTiO3 nanoparticles.The results demonstrate that oxygenic groups are successfully attached to the BaTiO3 surface,and the quantity of the functional groups increases with the treatment voltage.Furthermore,the effect of modified BaTiO3 nanoparticles on the morphology and crystal structure of the PVDF/BaTiO3 membrane is investigated.The results reveal that the dispersion of BaTiO3 nanoparticles in the PVDF matrix was greatly improved due to the modification of the BaTiO3 nanoparticles by air plasma.It is worth noting that the formation of a β-phase in a PVDF/modified BaTiO3 membrane is observably promoted,which results from the strong interaction between PVDF chains and oxygenic groups fixed on the BaTiO3 surface and the better dispersion of BaTiO3 nanoparticles in the PVDF matrix.Besides,the PVDF/modified BaTiO3 membrane at the treatment voltage of 24 k V exhibits a lower water contact angle(≈68.4°) compared with the unmodified one(≈86.7°).Meanwhile,the dielectric constant of PVDF/BaTiO3 nanocomposites increases with the increase of working voltage. 展开更多
关键词 PVDF BaTiO3 NANOCOMPOSITE non-thermal plasma β-phase ferroelectric
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3-Phase Modeling for the Origin of Chinese Lithium-Rich Brines
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作者 HUANG Wenbin WU Xishun +1 位作者 DU Xiaohui LI Li 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2014年第S1期339-340,共2页
There are significantly different origins and mineralizations among various lithium-rich brines of the world.As for Clayton Valley,Nevada,the data and interpretations recently presented suggest that the model
关键词 3-phase modeling lithium brine origin Qaidam Basin
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THE INITIAL CORROSION MECHANISM OFα-PHASE ALUMINIUM BRONZE IN NaCI SOLUTION
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作者 Zhu Xiaolong Li Renshun +1 位作者 Wu Rengeng Zhou Derui 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 1992年第1期69-72,76,共5页
The polarization curves of theα-PHASE aluminium bronze measured in 5%NaCl electrochemically show that the corrosion process of the alloy is controlled by the diffusion of oxygen.The corrosion surface of theα-PHASE A... The polarization curves of theα-PHASE aluminium bronze measured in 5%NaCl electrochemically show that the corrosion process of the alloy is controlled by the diffusion of oxygen.The corrosion surface of theα-PHASE A1 bronze in NaCl solution for a short time was analysed by X-ray Photoelectron Spectroscopy(XPS).The results indicate that the initial corrosion product of the A1 bronze consists of a simple Cu20 phase.A1 and Ni are incorporated in Cu20 lattice structure in the form of ions,and none of the aluminium compound can be detected.The authors propose that the initial corrosion mechanism ofα-PHASE A1 bronzes in NaCl solution should include oxidation,reduction and diffusion. 展开更多
关键词 α-phase Al bronze NaCl solution initial corrosion X-ray Photoelectron Spectroscopy
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Effect of Injection Position on In-Flight Melting Behavior of Granular Alkali-Free Glass Raw Material in 12-Phase AC Arc Plasma
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作者 姚耀春 K.YATSUDA +1 位作者 T.WATANABE T.YANO 《Plasma Science and Technology》 SCIE EI CAS CSCD 2009年第6期699-703,共5页
An innovative in-flight glass melting technology with a multi-phase AC arc plasma was developed to save energy and reduce emissions for the glass industry. The effect of the injection position on the in-flight melting... An innovative in-flight glass melting technology with a multi-phase AC arc plasma was developed to save energy and reduce emissions for the glass industry. The effect of the injection position on the in-flight melting behavior of granulated powders was investigated. Results show that the injection position has a strong effect on the melting behavior of alkali-free glass raw material. With the increase in injection distance, the vitrification, decomposition, and particle shrinkage of initial powders are improved. Longer injection distance causes much energy to transfer to particles due to a longer residence time of powder in the high temperature zone. The high vitrification and decomposition degrees indicate that the new in-flight melting technology with 12-phase AC arc can substantially reduce the melting and refining time for glass production. 展开更多
关键词 12-phase AC arc plasma in-flight melting technology heat transfer glass production
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EFFECT OF Mg AND δ-PHASE ON MECHANICAL PROPERTIES OF ALLOY GH169(INCONEL718)
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作者 DONG Jianxin XIE Wei +2 位作者 XU Zhichao XIE Xishan ZHANG Shouhua 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1993年第6期405-409,共5页
Micro-alloying of Mg,ranged from 30 to 70 ppm,may improve the high temperature ductility,stress rupture,especially,certain important mechanical properties,such as cyclic stress rupture,creep/fatigue interaction and cr... Micro-alloying of Mg,ranged from 30 to 70 ppm,may improve the high temperature ductility,stress rupture,especially,certain important mechanical properties,such as cyclic stress rupture,creep/fatigue interaction and crack propagation rate.The quantity, morphology and distribution of δ-phase may obviously influence the notched cyclic stress rup- ture life.The relevant microstructure shows that the Mg may also influence to certain extent on the feature of δ-phase.Thus,to keep the Mg and δ-phase under control may further im- prove the mechanical properties of alloy GH169. 展开更多
关键词 superalloy GH169 mechanical property δ-phase Mg creep/fatigue interaction craek propagation rate
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Fault diagnosis algorithm for 3-phase passive rectifiers based on frequency-domain analysis for acceleration grid power supply in CFETR NBI system
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作者 Bangyou ZHU Shaoxiang MA +3 位作者 Hongqi ZHANG Zhiheng LI Ming ZHANG Yuan PAN 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第12期40-54,共15页
The acceleration grid power supply(AGPS) is a crucial part of the Negative-ion Neutral Beam Injection system in the China Fusion Engineering Test Reactor,which includes a 3-phase passive(diode) rectifier.To diagnose a... The acceleration grid power supply(AGPS) is a crucial part of the Negative-ion Neutral Beam Injection system in the China Fusion Engineering Test Reactor,which includes a 3-phase passive(diode) rectifier.To diagnose and localize faults in the rectifier,this paper proposes a frequencydomain analysis-based fault diagnosis algorithm for the rectifier in AGPS.First,time-domain expressions and spectral characteristics of the output voltage of the TPTL-NPC inverter-based power supply are analyzed.Then,frequency-domain analysis-based fault diagnosis and frequency-domain analysis-based sub-fault diagnosis algorithms are proposed to diagnose open circuit(OC) faults of diode(s),which benefit from the analysis of harmonics magnitude and phase-angle of the output voltage.Only a fundamental period is needed to diagnose and localize exact faults,and a strong Variable-duration Fault Detection Method is proposed to identify acceptable ripple from OC faults.Detailed simulations and experimental results demonstrate the effectiveness,quickness,and robustness of the proposed algorithms,and the diagnosis algorithms proposed in this article provide a significant method for the fault diagnosis of other rectifiers and converters. 展开更多
关键词 fault diagnosis 3-phase passive rectifier acceleration grid power supply(AGPS) fault localization
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FORMATION OFδ-PHASE IN AUSTENITIC STEELS
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作者 YANG Ruzeng DAI Qixun (Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1995年第3期199-203,共5页
The relationship between the γ/(γ+δ) boundary temperature Tδ of austenitic steels and the equivalent weights of [Crl and [Ni] and the variation rule of the δ phase volume with the temperature are studied With th... The relationship between the γ/(γ+δ) boundary temperature Tδ of austenitic steels and the equivalent weights of [Crl and [Ni] and the variation rule of the δ phase volume with the temperature are studied With the aid of computer,the regressives expression derived from the experimental results are Tδ(℃) = T4 -21.2[Cr] +15.8[Ni]-223. Vδ(%)=0.715 exp 0.015(T-Tδ). 展开更多
关键词 austenitic steel structure stability δ-phase γ/γ + δboundary
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A Device for Measuring 3-Phase Alternating Current at a Distance
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作者 Seppo Makinen 《Journal of Electromagnetic Analysis and Applications》 2015年第8期209-216,共8页
We have made a preliminary study on a possibility to build a device, which could measure three-phase alternating current at a distance. This report gives a brief look at the theoretical background related with such a ... We have made a preliminary study on a possibility to build a device, which could measure three-phase alternating current at a distance. This report gives a brief look at the theoretical background related with such a device and derives several mathematical results associated with the theory and the structure of the device. Our results suggest that such a device can be built, assuming the distances between the three current-carrying wires and the two sensors of the device are known accurately enough. There are ways to measure these distances, but this article does not concentrate on them. 展开更多
关键词 Electromagnetic Induction 3-phase Alternating Current AMMETER
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Solid-phase Synthesis of Unsaturated β-Dicarbonyl Compounds from Polymer-supported 4-(Phenylseleno)morpholine
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作者 Xiao Ling LIU Xing Cong WANG +1 位作者 Shou Ri SHENG Xian HUANG 《Chinese Chemical Letters》 SCIE CAS CSCD 2004年第9期1009-1010,共2页
The solid-phase synthesis of unsaturated ?dicarbonyl compounds has been reported.
关键词 Solid phase organic synthesis 4-(phenylseleno)morpholine α-formylcycloanone unsaturated β-dicarbonyl compound.
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β相控制法改进黄铜合金的热加工性能
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作者 杨春秀 娄花芬 +3 位作者 陈忠平 向朝建 张曦 王苗苗 《材料热处理学报》 CSCD 北大核心 2023年第12期160-167,共8页
通过立式半连铸方法制备了Cu-40Zn-1Pb-0.15Fe-0.03Ni双相黄铜合金,针对热轧开裂问题,采用Gleeble-3500热模拟机对合金进行圆柱体压缩试验和扁平压缩试验,研究了双相黄铜合金在变形温度为600~780℃及应变速率为0.01~10 s^(-1)的条件下... 通过立式半连铸方法制备了Cu-40Zn-1Pb-0.15Fe-0.03Ni双相黄铜合金,针对热轧开裂问题,采用Gleeble-3500热模拟机对合金进行圆柱体压缩试验和扁平压缩试验,研究了双相黄铜合金在变形温度为600~780℃及应变速率为0.01~10 s^(-1)的条件下的热变形行为和热轧工艺性能。通过应力-应变曲线分析得到了合金的本构方程,计算绘制了热加工图,分析了热机械加工(TMP)诱导的α-β相变对α和β相的形成和铅颗粒分布的影响,利用热加工图结合显微组织确定了合金的热变形的流变失稳区和最佳变形参数。结果表明:双相黄铜合金加工过程主要存在两个失稳区:1)变形温度为670~710℃,应变速率为2.5~10 s^(-1)的区域;2)变形温度为750~780℃,应变速率为5~10 s^(-1)的区域。在较低温区(690℃以下),合金为α+β双相组织,且随着温度升高合金中β相占比逐渐增大、α相逐渐球化;在中温区(700~750℃),合金基本为β单相组织,利于热轧加工;在高温区(750℃以上),从β相组织的晶界处生长出针状α相,容易造成合金热轧开裂。 展开更多
关键词 铅黄铜 热加工 Α相 Β相 组织演变 力学性能
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