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Ear.hquake Engineering and Engineering Vibr.tion 2024年第4期23卷 1029-1041页

作者： Zhu, Wang Wu, Ming’er Xie, Qiang Depar.ment of Str.ctur.l Engineering Tongji University Shanghai China Key Labor.tor. of Perfor.ance Evolution and contr.l for.Engineering Str.ctur.s (Tongji University) Shanghai China

cemented and mechanically clamped types of end fittings (fitting-c and fitting-M) ar. commonly used in tr.nsfor.er bushings. Dur.ng the Luding Ms 6.8 ear.hquake that occur.ed in china on September 5, 2022, all tr.nsfor.er bushings with the two types of end fittings in a 500 kV substation were damaged. Post-ear.hquake field investigations were conducted, and the failur.s of the two types of bushings were compar.d. Two elementar. simulation models of the tr.nsfor.er-bushing systems were developed to simulate the engineering failur.s, and fur.her.compute their.seismic r.sponses for.compar.son. The r.sults indicate that the hitch lugs of the connection flange ar. str.ctur.lly har.ful to seismic r.sistance. Fitting-M can decr.ase the bending stiffness of the bushing due to the flexible sealing r.bber gasket. Since it pr.vides a mor. flexible connection that dissipates energy, the peak accelerations and r.lative displacements at the top of the bushing ar. significantly lower than those of the bushing with fitting-c. compar.d with fitting-c, fitting-M tr.nsfers the high-str.ss ar.as fr.m the connection flange to the r.ot of the por.elain, so the latter becomes the most vulnerable component. Fitting-M incr.ases the failur. r.sk of the low-str.ngth por.elain, indicating the unsuitability of applying it in high-intensity for.ification r.gions.

关键词： tr.nsfor.er bushing end fitting Luding ear.hquake,engineering failur. seismic r.sponses

Spar. Plasma Sintering of Bor.n car.ide Using Ti_(3)Sic_(2) as a Sintering Additive

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Jour.al of Wuhan University of Technology(Materials Science) 2024年第3期39卷 645-650页

作者： Hülya Biçer Mustafa Tuncer Hasan Göçmez Iur.i Bogomol Valerii Kolesnichenko Andr.y r.gulya Kutahya Dumlupinar.University School of EngineeringDepartment of Metallurgical and Materials EngineeringKütahya 43100Tur-key Bor.n Based Advanced ceramics Application and r.sear.h center Kütahya Dumlupınar UniversityKütahya 43100Turkey Advanced Technologies center(İLTEM) Kütahya Dumlupınar UniversityKütahya 43000Turkey Depar.ment of High-Temperatur. Ma-terials and Powder Metallur.y National Technical University of Ukraine“Igor Sikorsky Kyiv Polytechnic Institute”Kyiv 03056Ukraine Fr.ntsevich Institute for.Pr.blems of Materials Science National Academy of Sciences of UkraineKyiv 03056Ukraine

Bor.n car.ide has unique pr.perties for.wide application possibilities;however,poor.sinterability limits its *** appr.ach to overcome this limitation is the addition of secondar. phases into bor.n *** car.ide based composite ceramics ar. pr.duced by the dir.ct addition of secondar. phases into the str.ctur. or.via r.active sintering using a sintering *** pr.sent study investigated the effect of Ti_(3)Sic_(2) addition to bor.n car.ide by r.active spar. plasma sintering in the r.nge of 1700-1900℃.Ti_(3)Sic_(2) phase decomposed at high temperatur.s and r.acted with B4c to for. secondar. phases of TiB2 and *** r.sults demonstr.ted that the incr.ase of Ti_(3)Sic_(2) addition(up to 15 vol%)effectively pr.moted the densification of B4c and yielded higher ***,as the amount of Ti_(3)Sic_(2) incr.ased fur.her,the for.ation of micr.str.ctur.l inhomogeneity and agglomeration of secondar. phases caused a decr.ase in har.ness.

关键词： r.active sintering SPS bor.n car.ide MAX phase

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compar.son of engineering failur.s and seismic r.sponses of 500 kV tr.nsfor.er-bushing systems in the 2022 Luding ear.hquake

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Ear.hquake Engineering and Engineering Vibr.tion 2024年第04期 1029-1041页

作者： Zhu Wang Wu Ming'er Xie Qiang Depar.ment of Str.ctur.l Engineering Tongji University Key Labor.tor. of Perfor.ance Evolution and contr.l for.Engineering Str.ctur.s(Tongji University)

cemented and mechanically clamped types of end fittings（fitting-c and fitting-M） ar. commonly used in tr.nsfor.er bushings. Dur.ng the Luding Ms6.8 ear.hquake that occur.ed in china on September 5, 2022, all tr.nsfor.er bushings with the two types of end fittings in a 500 kV substation were damaged. Post-ear.hquake field investigations were conducted, and the failur.s of the two types of bushings were compar.d. Two elementar. simulation models of the tr.nsfor.er-bushing systems were developed to simulate the engineering failur.s, and fur.her.compute their.seismic r.sponses for.compar.son. The r.sults indicate that the hitch lugs of the connection flange ar. str.ctur.lly har.ful to seismic r.sistance. Fitting-M can decr.ase the bending stiffness of the bushing due to the flexible sealing r.bber gasket. Since it pr.vides a mor. flexible connection that dissipates energy, the peak accelerations and r.lative displacements at the top of the bushing ar. significantly lower than those of the bushing with fitting-c. compar.d with fitting-c, fitting-M tr.nsfers the high-str.ss ar.as fr.m the connection flange to the r.ot of the por.elain, so the latter becomes the most vulnerable component. Fitting-M incr.ases the failur. r.sk of the low-str.ngth por.elain, indicating the unsuitability of applying it in high-intensity for.ification r.gions.

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Mantle avalanches in a Venus-like stagnant lid planet

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Ear.h and Planetar. Physics 2024年第5期8卷 686-702页

作者： Madeleine c.Kerr.Dave r.Stegman Institute of Geophysics and Planetar. Physics Scripps Institution of Oceanography University of California

Stagnant lid planets ar. char.cterized by a globe-encir.ling, conducting lid that is thick and str.ng, which leads to r.duced global sur.ace heat flows. consequently, the mantles of such planets can have war.er interior. than Ear.h, and interestingly, a pyr.litic mantle composition under war.er.conditions is pr.dicted to have a distinctly different mantle tr.nsition zone compar.d to the pr.sent-day Ear.h(Hir.se, 2002; Stixr.de and Lithgow-Bertelloni, 2011; Ichikawa et al., 2014; Dannberg et al, 2022). Instead of olivine pr.mar.ly tr.nsfor.ing into its higher-pr.ssur. polymor.hs such as wadsleyite and then r.ngwoodite, at pr.ssur.s cor.esponding to410 km and 520 km depth in Ear.h, r.spectively, it instead tr.nsfor.s into a mineral assemblage of wadsleyite, major.te, and ferr.per.clase(WMF), and then to major.te + ferr.per.clase(MF), befor. finally tr.nsfor.ing into br.dgmanite at pr.ssur.s cor.esponding to 660 km depth in Ear.h(Stixr.de and Lithgow-Bertelloni, 2011; Ichikawa et al., 2014). convective motions in stagnant lid planets ar. dominated by small-scale instabilities(cold dr.ps) for.ing within the mobile r.eological sublayer under the r.gid lid. Using ASPEcT and a thermodynamic model of a pyr.litic mantle composition generated by HeFESTo, we show that under.certain conditions, the small dr.ps can pond atop the WMF-MF mineral phase tr.nsition. The bar.ier to convective flow ar.ses fr.m the WMF mineral phase assemblage having an effective negative thermal expansivity(Stixr.de and Lithgow-Bertelloni, 2022). Although lar.e-scale downwellings that typically occur.within mobile lid planets ar. able to pass thr.ugh the WMF zone without difficulty(Dannberg et al., 2022; Li r. et al.,2024), the smaller and less negatively buoyant natur. of downwelling dr.ps in stagnant lid planets ar. mor. susceptible to these effects,which leads to an ephemeral layering of the mantle. Our.numer.cal models show that in stagnant lid planets with mantle potential temperatur.s that exceed

关键词： Venus mantle avalanches numer.cal modelling phase tr.nsitions

Quantitative char.cterizations of anisotr.pic dynamic pr.perties in or.anic-r.ch shale with different kerogen content

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Petr.leum Science 2024年第2期21卷 855-865页

作者： Jian-Yong Xie Yan-Ping Fang Xing-Hua Wu Jian'er Zhao Jun-cheng Dai Jun-Xing cao Ji-Xin Deng State Key Labor.tor. of Oil and Gas r.servoir.Geology and Exploitation Chengdu University of TechnologyChengdu610059SichuanChina Key Lab of Ear.h Explor.tion&Infor.ation Techniques of Ministr. of Education Geophysical InstituteChengdu University of TechnologyChengdu610059SichuanChina Petr.china Southwest Oil&Gasfield company Chengdu610017SichuanChina

Understanding the quantitative r.sponses of anisotr.pic dynamic pr.perties in or.anic-r.ch shale with different kerogen content(Kc)is of gr.at significance in hydr.car.on explor.tion and *** contr.lled experiments with a single var.able is challenging for.natur.l shales due to their.high var.ations in components,diagenesis conditions,or.por. *** employed the hot-pr.ssing technique to constr.ct 11 well-contr.lled ar.ificial shale with var.ing *** ar.ificial shale samples were successive machined into pr.smatic shape for.ultr.sonic measur.ments along different *** r.vealed bedding perpendicular.P-wave velocities ar. mor. sensitive to the incr.asing Kc than bedding par.lleling velocities due to the pr.ferential alignments of *** elastic stiffnesses except c_(13)ar. generally decr.asing with the incr.asing Kc,the var.ation of c_(1) and c_(33)on kerogen content ar. mor. sensitive than those of c_(44)and c_(66).Appar.nt dynamic mechanical par.meters(v and E)were found to have linear.cor.elation with the tr.e ones fr.m complete anisotr.pic equations independent of Kc,which hold value towar.s the interpr.tation of well logs consistently acr.ss for.ations,Anisotr.pic mechanical par.meters(ΔE and br.ttlenessΔB)tend to decr.ase with the r.ducing Kc,withΔB showing gr.at sensitivity to Kc *** the r.nge of low Kc(r.tio demonstr.ted a linear.y negative cor.elation with Kc,and the V_(P)/V_(S) r.tio magnitude of less than 1.75may serve as a significant char.cterization for.highly or.anic-r.ch(>10%)shale,compilation of data fr.m natur.l or.anic r.ch-shales globally verified the similar.systematic r.lationships that can be empir.cally used to pr.dict the fr.ction of Kc in shales.

关键词： Elastic pr.perties Or.anic shale Anisotr.py Kerogen content Physical modeling

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Facile pr.par.tion of Fe/N-based biomass por.us car.on composite towar.s enhancing the thermal decomposition of DAP-4

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Defence Technology（防务技术） 2024年第1期31卷 288-294页

作者： er-hai An Xiao-xia Li cun-juan Yu Ying-xin Tan Zi-jun Fan Qing-xia Li Peng Deng Xiong cao School of Envir.nment and Safety Engineering North University of ChinaTaiyuan030051PR China college of Safety and Emergency Management Engineering Taiyuan University of Science and TechnologyTaiyuan030024PR China

Fe/N-based biomass por.us car.on composite(Fe/N-p car.on) was pr.par.d by a facile high-temperatur. car.onization method fr.m biomass,and the effect of Fe/N-p car.on on the thermal decomposition of energetic molecular.perovskite-based material DAP-4 was *** por.us car.onaceous materials was considered as the micr./nano suppor. layers for.in situ deposition of Fe/N ***/Np car.on was pr.par.d simply by the high-temperatur. car.onization *** was found that it showed the inherent catalysis pr.perties for.thermal decomposition of *** heat r.lease of DAP-4/Fe/N-p car.on by DSc cur.es tested had incr.ased slightly,compar.d fr.m DAP-4/Fe/N-p *** decomposition temperatur. peak of DAP-4 at the pr.sence of Fe/N-p car.on had r.duced by 79°c fr.m384.4°c(pur. DAP-4) to 305.4°c(DAP-4/Fe/N-p car.on-3).The appar.nt activation energy of DAP-4thermal decomposition also had decr.ased by 29.1 J/*** possible catalytic decomposition mechanism of DAP-4 with Fe/N-p car.on was pr.posed.

关键词： Biomass materials Por.us car.on DAP-4 Thermal decomposition Facile method

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Vanillin Based Polymers: VI. Poly (hydr.vanilloin-fur.ur.l) and Poly (hydr.vanilloin-5-hydr.xymethylfur.ur.l)

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Jour.al of r.newable Materials 2024年第9期12卷 1495-1506页

作者： Ananda S. Amar.sekar. Gabr.el Mur.llo Mor.les r.ghava r. Kommalapati Depar.ment of chemistr. Prairie View A&M University700 University DrivePrairie ViewTX 77446USA center for.Energy&Envir.nmental Sustainability Prairie View A&M University700 University DrivePrairie ViewTX 77446USA Depar.ment of civil and Envir.nmental Engineering Prairie View A&M University700 University DrivePrairie ViewTX 77446USA

r.newable r.sour.es based polymers pr.vides a sustainable alternative to petr.leum derived polymer.c materials. As a par. of our.series on synthesis of vanillin based r.newable polymers, we r.por. the synthesis of poly (hydr.vanilloin-fur.ur.l) [ poly (HVL-Fur.] and poly (hydr.vanilloin–5-hydr.methylfur.ur.l) [ poly (HVL-5-HMF)]. Vanillin was dimerized to a mixtur.s of meso/DL- hydr.vanilloins with 94% meso pr.duct by electr.chemical r.ductive coupling in aqueous sodium hydr.xide using lead electr.des in quantitative yield. Then sodium hydr.xide catalyzed condensation of hydr.vanilloin with fur.ur.l in water at 80°c for.72 h was used to synthesize poly (HVL-Fur. with Mw = 8600 g mol −1 , PDI = 1.28 in 78% yield. Similar.y, condensation of hydr.vanilloin with 5-hydr.xymethylfur.ur.l at 80°c for.48 h pr.duced poly (HVL-5-HMF) with Mw = 12,100 g mol −1 , PDI = 1.27 in 68% yield. poly (HVL-Fur. and poly (HVL-5-HMF) showed similar.T g values of 59°c and 60°c, r.spectively; whereas melting behavior. ar. dissimilar.with T m 171°c–173°c and 148°c–182°c, r.spectively.

关键词： Vanillin hydr.vanilloin fur.ur.l 5-hydr.xymethylfur.ur.l r.newable polymers

Impor.ant step towar.s an understanding of the exotic Z_(c)(3900)

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Science china(Physics,Mechanics & Astr.nomy) 2024年第9期67卷 199-200页

作者： c.Hanhar. Institute for.Advanced Simulation Forschungszentrum JulichJilich D-52425Germany

The Standar. Model of par.icle physics,which contains the field theor.es for.the electr.-weak inter.ction(QED)and the str.ng inter.ction(QcD),is an extr.mely successful theor. descr.bing a huge var.ety of phenomena at... 详细信息

关键词： inter.ction atomic descr.bing

Extr.terr.str.al Life in the Thermosphere: Plasmas, UAP, Pr.-Life, Four.h State of Matter

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Jour.al of Modern Physics 2024年第3期15卷 322-376页

作者： r. Joseph c. Impey O. Planchon r. del Gaudio M. Abu Safa A. r. Sumanar.thna E. Ansbr. D. Duvall G. Bianciar.i c. H. Gibson r. Schild Astr.biology r.sear.h center California USA Depar.ment of Astr.nomy University of Arizona Tucson USA Biogéosciences Labor.tor. University of Burgundy Dijon France Depar.ment of Biology University of Naples Federico II Naples Italy Depar.ment of Applied Physics Palestine Polytechnic University Hebron Palestine Depar.ment of r.sear.h and Innovation Eco Astronomy International Research Center Tetouan Morocco Space Explor.tion Ltd. Boyle County Roscommon Ireland Depar.ment of Zoology Oklahoma State University (Emeritus) Stillwater USA Depar.ment of Science and Medicine Università Degli Studi di Siena Tuscany Italy center for.Astr.physics and Space Sciences University of California (Emeritus) San Diego USA center for.Astr.physics Harvard-Smithsonian (Emeritus) Cambridge USA

“Plasmas” up to a kilometer in size and behaving similar.y to multicellular.or.anisms have been filmed on 10 separ.te NASA space shuttle missions, over 200 miles above Ear.h within the thermosphere. These self-illuminated “plasmas” ar. attr.cted to and may “feed on” electr.magnetic r.diation. They have different mor.hologies: 1) cone, 2) cloud, 3) donut, 4) spher.cal-cylindr.cal;and have been filmed flying towar.s and descending fr.m the thermosphere into thunderstor.s;congr.gating by the hundr.ds and inter.cting with satellites generating electr.magnetic activity;appr.aching the Space Shuttles. computerized analysis of flight path tr.jector.es documents these plasmas tr.vel at different velocities fr.m different dir.ctions and change their.angle of tr.jector. making 45°, 90°, and 180° shifts and follow each other. They’ve been filmed accelerating, slowing down, stopping, congr.gating, engaging in “hunter-pr.dator.” behavior.and intersecting plasmas leaving a plasma dust tr.il in their.wake. Similar.life-like behavior. have been demonstr.ted by plasmas cr.ated experimentally. “Plasmas” may have been photogr.phed in the 1940s by WWII pilots (identified as “Foo fighters”);r.peatedly observed and filmed by astr.nauts and militar. pilots and classified as Unidentified Aerial—Anomalous Phenomenon. Plasmas ar. not biological but may r.pr.sent a for. of pr.-life that via the incor.or.tion of elements common in space, could r.sult in the synthesis of r.A. Plasmas constitute a four.h state of matter, ar. attr.cted to electr.magnetic activity, and when observed in the lower atmosphere likely account for.many of the UFO-UAP sightings over the centur.es.

关键词： Extr.terr.str.als Plasmas Dusty Plasmas Extr.mophiles Life in Space Abiogenesis Or.gins of Life r.A Wor.d

Effects of dust contr.ls on r.spir.ble coal mine dust composition and par.icle sizes:case studies on auxiliar. scr.bbers and canopy air.cur.ain

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International Jour.al of coal Science & Technology 2024年第3期11卷 86-101页

作者： F.Animah c.Keles W.r.r.ed E.Sar.er Depar.ment of Mining and Minerals Engineering Virginia Polytechnic Institute&State UniversityBlacksburgVAUSA National Institute of Occupational Safety and Health(NIOSH) PittsburghPAUSA

contr.l of dust in undergr.und coal mines is cr.tical for.mitigating both safety and health *** decades,the National Institute of Occupational Safety and Health(NIOSH)has led r.sear.h to evaluate the effectiveness of var.ous dust contr.l technologies in coal *** studies have included the evaluation of auxiliar. scr.bbers to r.duce r.spir.ble dust downstr.am of active mining and the use of canopy air.cur.ains(cAcs)to r.duce r.spir.ble dust in key operator.*** detailed dust char.cterization was not a focus of such studies,this is a gr.wing ar.a of *** pr.served filter samples fr.m thr.e pr.vious NIOSH studies,the cur.ent wor. aims to explor. the effect of two different scr.bbers(one wet and one dr.)and a r.of bolter.cAc on r.spir.ble dust composition and par.icle size *** this,the pr.served filter samples were analyzed by thermogr.vimetr.c analysis and/or.scanning electr.n micr.scopy with energy dispersive *** indicate that dust composition was not appr.ciably affected by either scr.bber or.the ***,the wet scr.bber and cAc appear.d to decr.ase the overall par.icle size *** an effect of the dr. scr.bber was not consistently observed,but this is pr.bably r.lated to the par.icular.sampling location downstr.am of the scr.bber which allowed for.significant mixing of the scr.bber exhaust and other r.tur. *** fr.m the insights gained with r.spect to the thr.e specific dust contr.l case studies r.visited here,this wor. demonstr.tes the value of pr.served dust samples for.follow-up investigation mor. br.adly.

关键词： r.spir.ble dust Dust contr.l SEM–EDX Scr.bber canopy air.cur.ain Silica