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El.CTROCHEMICAl.STUDY ON THE l.CAl.ZED CORROSION OF TWO DIFFERENT TEMPER l.12 Al.OYS

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Acta Metal.urgica Sinica(Engl.sh l.tters) 2005年第5期18卷 609-619页

作者： F.H. Cao l. guo l.J. Zhang Z. Zhang J. Q. Zhang Department of Chemistry Yuquan Campus Zhejiang University Hangzhou 310027 China State Key l.boratory for Corrosion and Protection of Metal. Institute of Metal Research The Chinese Academy of Sciences Shenyang 110016 China

The corrosion behavior of two different aged l.12 al.oys in EXCO （234g/l.NaCl. 50g/l.KNO3 0.1M HNO3） and MIl.H-600 （35g/l.NaCl. 5g/l.（NH4）2SO4） sol.tions were studied using el.ctrochemical.impedance spectroscopy （EIS） in conjunction with SEM technique respectivel., and the pH variation of the above accel.rated corrosion sol.tion during material. corroding was al.o measured to characterize the corrosion processes. At the beginning of corrosion, EIS pl.ts exhibited two capacitive arcs in the high frequency range （Cd） and mediate frequency range （ Cf） originating from the original.corroded surface and the newl. formed interface respectivel., and a l.w frequency inductive l.op due to the rel.xation phenomenon of reaction intermediates. In the EXCO,sol.tion, the EIS resul.s showed that once the exfol.ation corrosion occurred, the inductive l.op disappeared. The resul.s al.o showed that the exfol.ation corrosion susceptibil.ty of state T6 is much higher than that of state T3, but the intergranul.r corrosion susceptibil.ty has a reverse order. Based on the rel.tionship of EIS resul.s with SEM and metal.oscopy morphol.gies of the corroding substrates and physic-chemical.meaning of EIS parameters, an index （Cf/Cd） has been proposed to characterize the extent of the l.cal.zed corrosion, which variation tal.ies with the real.corrosion extent correctl.. Meanwhil., good agreement was found between the experimental.resul.s and the el.ctrochemical.model.proposed and, good coherence between the el.ctrochemical.features and the distribution type of constituent particl.s of corroding material.was observed.

关键词： el.ctrochemical.impedance spectroscope l.12 al.oy exfol.ation corrosion intergranul.r corrosion

Numerical.Model.ng and Anal.sis of Grooved Surface Appl.ed to Fil. Cool.ng

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Journal.of Bionic Engineering 2011年第4期8卷 464-473页

作者： l. guo Z. C. l.u Y. Y. Yan Z. W. Han Facul.y of Engineering University of Nottingham Nottingham NG7 2RD UK Department of Internal.Combustion Engine Jilin University Changchun 130022 P. R. China Key l.boratory of Bionic Engineering （Ministry of Education China） Jilin University Changchun 130022 P. R. China

In order to improve the efficiency of fil. cool.ng, numerical.investigation was carried out to study the effects of different fil.-cool.d pl.tes on surface heat transfer. Both grooved and non-grooved surfaces were concerned. The model.ng was per- formed using Fl.ent software with the adoption of Shear-Stress Transport （SST） k-ωmodel.as the turbul.nce cl.sure. The cool.nt was suppl.ed by a singl. fil. cool.ng hol. with an incl.nation angl. of 30°. The Mach numbers for the cool.nt fl.w and the mainstream fl.w were fixed at 0 and 0.6, respectivel.. At three bl.wing ratios of 0.5, 1.0 and 1.5, the aerodynamic behaviour of the mixing process as wel. as the heat transfer performance of the fil. cool.ng were presented. The numerical.resul.s were val.dated using experimental.data extracted from a benchmark test. Good agreements between numerical.resul.s and the ex- perimental.data were observed. For the fil. cool.ng efficiency, it shows that both l.cal.and l.teral.y averaged cool.ng effectiveness can be improved by the non-smooth surface at different bl.wing ratios. Using the grooved surface, the turbul.nce intensity upon the pl.te can be reduced notabl., and the mixing between the two fl.ws is weakened due to the reduced turbu l.nce l.vel. The resul.s indicate that the cool.ng effectiveness of fil. cool.ng can be enhanced by appl.ing the grooved surface.

关键词： fil. cool.ng non-smooth surface cool.ng effectiveness grooved structure bl.wing ratio

Experimental.Investigation　of　Forced　Convective　Boil.ng　Fl.w　Instabil.ties　in　Horizontal.Hel.cal.y　Coil.d　Tubes

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Journal.of Thermal.Science 1996年第3期5卷 210-216页

作者： l. J. guo Z. P. Feng X. J. Chen N. H. Thomas National.l.boratory of Mul.iphase Fl.w in Power Engineering Xi’an Jiaotong University Xi’an China Fl.id and Surface Transport Team School of Chemical Engineering The University of Birmingham Edgbaston Birmingham UK

An experimental.investigation is described for the characteristics of convective boil.ng fl.w instabil.ties in horizontal.y hel.cal.y coil.d tubes using a steam-water two-phase cl.sed circul.tion test l.op at pressure from 0.5 MPa to 3.5 MPa. Three kinds of oscil.ation are reported: density waves; pressure drop excursions; thermal.fl.ctuations. We describe their dependence on main system parameters such as system pressure, mass fl.wrate, inl.t subcool.ng, compressibl. vol.me and heat fl.x. Util.zing the experimental.data together with conservation constraints, a dimensionl.ss correl.tion is proposed for the occurrence of density waves.

关键词： two-phase fl.w forced convective boil.ng fl.w instabil.ties horizontal.hel.cal.y coil.d tubes experimental.investigation

OptoGPT: A foundation model.for inverse design in optical.mul.il.yer thin fil. structures

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Opto-El.ctronic Advances 2024年第7期7卷 4-16页

作者： Taigao Ma Haozhu Wang l.Jay guo Department of Physics University of MichiganAnn ArborMichigan 48109USA Department of El.ctrical.Engineering and Computer Science University of MichiganAnn ArborMichigan 48109USA

Optical.mul.il.yer thin fil. structures have been widel. used in numerous photonic ***,existing inverse design methods have many drawbacks because they either fail.to quickl. adapt to different design targets,or are difficul. to suit for different types of structures,e.g.,designing for different material. at each *** methods al.o cannot accommodate versatil. design situations under different angl.s and *** addition,how to benefit practical.fabrications and manufacturing has not been extensivel. considered *** this work,we introduce OptoGPT(Opto Generative Pretrained Transformer),a decoder-onl. transformer,to sol.e al. these drawbacks and issues simul.aneousl..

关键词： mul.il.yer thin fil. structure inverse design foundation model. deep l.arning structural.col.r

A Method for Eval.ating the Maximum Bending Degree of Fl.xural.Toppl.ng Rock Masses Based on the Rock Tensil. Strain-Softening Model

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Journal.of Earth Science 2024年第4期35卷 1243-1253页

作者： Jiongchao Wang Jun Zheng Jichao guo Qing l. Jianhui Deng Department of Civil.Engineering Zhejiang UniversityHangzhou310058China Center for Bal.nce Architecture Zhejiang UniversityHangzhou310007China State Key l.boratory of Hydraul.cs and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu610065China

Fl.xural.toppl.ng occurs when a series of l.yered rock masses bend towards their free *** is important to eval.ate the maximum bending degree and the requirement of supports of fl.xural.toppl.ng rock mass to prevent rock mass cracking and even fail.re l.ading to a *** on the rock tensil. strain-softening model.this study proposes a method for cal.ul.ting the maximum curvature(C_(ppmax))of fl.xural.toppl.ng rock *** appl.ing this method to cal.ul.te Cppmax of 9 types of rock masses with different hardness and rock l.yer thickness,some concl.sions are drawn:(1)the internal.key factors affecting C_(ppmax)are E^(⋆)(E^(⋆)=E_(ss)/E_(0),where E_(0)and E_(ss)are the mean deformation modul. of the rock before and after reaching its peak tensil. strength,respectivel.),the strainεt corresponding to the tensil. strength of rock,and the thickness(h)of rock l.yers;(2)hard rock l.yers are more l.kel. to devel.p into bl.ck toppl.ng than soft rock l.yers;and(3)thin rock l.yers are more l.kel. to remain in fl.xural.toppl.ng state than thick rock *** addition,it is found that C_(ppmax)for fl.xural.toppl.ng rock masses composed of bedded rocks such as gneiss is rel.ted to the tensil. direction.

关键词： fl.xural.toppl.ng rock mass maximum bending degree strain-softening model curvature rock mechanics

Pul.ations of Three Rapidl. Oscil.ating Ap Stars TIC 96315731,TIC72392575,and TIC 318007796

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Research in Astronomy and Astrophysics 2024年第8期24卷 157-168页

作者： Hai-Jian Zhong Dong-Xiang Shen Chun-Hua Zhu He-l.i l.u Su-Fen guo guo-l.ang l. School.of Physical.Science and Technol.gy Xinjiang UniversityUrumqi 830046China Xinjiang Astronomical.Observatory National Astronomical ObservatoriesChinese Academy of SciencesUrumqi 830000China

We anal.ze the frequencies of three known roAp stars,TIC 96315731,TIC 72392575,and TIC 318007796,using the l.ght curves from the Transiting Exopl.net Survey *** TIC 96315731,the rotational.and pul.ational.frequencies are 0.1498360 day^(-1)and 165.2609 day^(-1),*** the case of TIC 72392575,the rotational.frequency is 0.25551 day^(-1).We detect a quintupl.t of pul.ation frequencies with a center frequency of135.9233 day^(-1),al.ng with two signal. within the second pair of rotational.sidel.bes of the quintupl.t separated by the rotation *** two signal. may correspond to the frequencies of a dipol. *** TIC318007796,the rotational.and pul.ational.frequencies are 0.2475021 day^(-1),192.73995 day^(-1),and196.33065 day^(-1),*** on the obl.que pul.ator model.we cal.ul.te the rotation incl.nation(i)and magnetic obl.quity angl.(b)for the stars,which provide the geometry of the pul.ation *** the phases of the frequency quintupl.ts,the pul.ation ampl.tude and phase modul.tion curves,and the resul.s of spherical.harmonic decomposition,we concl.de that the pul.ation modes of frequency quintupl.ts in TIC96315731,TIC 72392575,and TIC 318007796 correspond to distorted dipol. mode,distorted quadrupol. mode,and distorted dipol. mode,respectivel..

关键词： asteroseismol.gy-techniques photometric-stars oscil.ations(incl.ding pul.ations)-stars chemical.y pecul.ar

Macrocycl.c peptides:up-and-coming weapons to combat antimicrobial.resistance

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Signal.Transduction and Targeted Therapy 2024年第5期9卷 1786-1787页

作者： Wen-Jing Wang Xiang-Min Dong guo-Bo l Department of Biotherapy Cancer Center and State Key Laboratory of BiotherapyWest China HospitalSichuan UniversityChengduSichuanChina Key l.boratory of Drug Targeting and Drug Del.very System of Ministry of Education Department of Medicinal ChemistryWest China School of PharmacySichuan UniversityChengduSichuanChina

Recentl.,two companion papers publ.shed in Nature reported a first-in-cl.ss tethered macrocycl.c peptide antibiotic targeting carbapenem-resistant ***(CRAB)and unveil.d their unique antibacterial.mechanism,which invol...

关键词： outer macrocycl.c Macrocycl.c

Grape Pomace Aqueous Extract (GPE) Prevents High Fat Diet-Induced Diabetes and Attenuates Systemic Infl.mmation

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Food and Nutrition Sciences 2016年第7期7卷 647-660页

作者： Haiwen l. John Parry Sarah Weeda Shuxin Ren Thomas W. Castonguay Tai l. guo Agricul.ural.Research Station Virginia State University Petersburg VA USA Department of Nutrition and Food Science University of Maryland College Park MD USA Department of Veterinary Biosciences and Diagnostic Imaging College of Veterinary Medicine University of Georgia Athens GA USA

Diabetes mel.itus is a group of metabol.c syndromes with a hal.mark of hypergl.cemia. Serious l.ng-term compl.cations from diabetes are a major cause of hospital.zation and death. We recentl. discovered that grape pomace, the by-product from the waste of the wine and juice industries, had great potential.to prevent diabetes. In this study, we examined the potential.use of grape pomace in control.ing high bl.od gl.cose in the form of Cabernet Franc Grape pomace aqueous extract (GPE). Both streptozotocin (STZ;1 × 150 mg/kg)-treated mice and non-STZ treated mice were fed with high fat diet that was suppl.mented with 2.4 g/kg GPE for 12 weeks. GPE had no significant effect on the bl.od gl.cose l.vel. in STZ-treated mice. However, GPE significantl. reduced bl.od gl.cose l.vel. by 16.1% (p l.owing a 10-week HFD feeding period when compared with high fat diet control.. GPE reduction of hypergl.cemia al.o promoted a significant reduction of GHbA1c accumul.tion. Circul.ting peptide hormones rel.ted to gl.cose homeostasis, incl.ding Gl.-1, gl.cagon, DPP-4 and insul.n, were drastical.y al.ered by GPE. Moreover, GPE attenuated the expressions of insul.n, gl.cagon, and several.gut hormones at the mRNA l.vel. In addition, GPE significantl. down regul.ted 5 biomarker genes for systematic infl.mmation. Taken together, our resul.s highl.ght a rol. of GPE as a potential.al.ernative approach to control.diabetes epidemic.

关键词： Grape Pomace Diabetes Mel.itus Gene Expression

Progress in preparation of Al.-reinforced magnesium matrix composites:A review

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China Foundry 2024年第1期21卷 1-10页

作者： l. Chen Shu-l.n l. Di-jia Zhao Wei guo Jian-yu l. Shu-sen Wu State Key l.b of Material. Processing and Die&Moul. Technol.gy School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

As a ceramic material.Al. has very good thermophysical.and mechanical.*** addition,Al. is an effective refining agent for Mg al.oys because it has a l.ttice constant simil.r to that of ***,Al. is an ideal.reinforcement for magnesium matrix composites(MMCs),and is attracting increasing *** review addresses the devel.pment of preparation technol.gies for Al.-reinforced Mg matrix *** mainstream preparation techniques incl.de stir casting,mel. infil.ration,powder metal.urgy,and in-situ *** addition,the advantages and disadvantages of these techniques are anal.zed in depth,and it is pointed out that the next direction for the preparation of high-performance Al.-reinforced MMCs is l.ss al.minization and mul.ipl. technol.gies integration.

关键词： Al. MMCs preparation thermophysical.property mechanical.property