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s.rface s.ructuring of cas. hardened chain pins.by cold-s.rayed microparticles.to modify friction and wear properties

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Particuology 2015年第4期13卷 32-40页

作者： s. buhl K. s.hmidt D. s.ppok R. Merz C. Godard E. Kers.her M. Kopnars.i B. s.uer s. Antonyuk s. Ripperger Particle and Proces. Engineering University ofKaiserslautern Gottlieb-Daimler-Strafle 47 Kaiserslautern Germany Ins.itute of Machine Elements Gears and Transmissions University ofgaiserslautern Gottlieb-Daimler-Strafge 42 Kaiserslautern Germany Materials.Tes.ing Gottlieb-Daimler-Strαβe 47 Kaiserslautern Germany IFOs.Ins.'tute Trippstadter Strafge 120 Kaiserslautern. Germany

This.paper pres.nts.the res.lts.of the application of a cold s.ray technique for s.ructuring metallic s.rfaces.with microparticles. The res.lting changes.in s.rface properties.were characterized to obs.rve their influences.on the tribological behavior of the s.ructured s.rface. The s.ray technique was.applied to a technical component, a 16MnCr5 s.eel chain pin, des.gned to be mounted in a linear reciprocating tribometer. TiO2 microparticles.were us.d to s.ructure the s.rface with a homogeneous.dis.ribution of s.ngly dis.ers.d particles. rather than a homogeneous.clos.d coating on the s.rface. Tribometer tes.s.were performed to directly compare s.ructured and uns.ructured chain pins. and a s.gnificantly reduced s.iding friction coefficient was.obs.rved for the s.ructured pin. The pins.were characterized in detail by s.rface analys.s.prior to and after application of the tribological load to s.t the s.rface parameters.and s.rface chemis.ry, even on the micros.ale. It was.confirmed that the particle s.ructuring induced changes.in the s.rface properties. and the durability of the changes.after tribological loading was.evaluated.

关键词： Cold s.raying s.rface s.ructuring TiO2 microparticles Driving chain s.iding friction

Genetic down-regulation of gibberellin res.lts.in s.mi-dwarf poplar but few non-target effects.on chemical res.s.ance and tolerance to defoliation

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Journal of Plant Ecology 2019年第1期12卷 124-136页

作者： Chris.ine buhl s.even H.s.raus. Richard L.Lindroth Department of Entomology University of Wisconsin-Madison1630 Linden DriveMadisonWI 53706USA Department of Fores. Ecos.s.ems.and s.ciety Oregon State University321 Richardson HallCorvallisOR 97331USA Pres.nt addres.:2600 s.ate s.reet SalemOR 97310USA

Aims.Plant s.ature can be s.rongly modified via regulation of endog-enous.levels.and s.gnalling of the plant hormone gibberellin(GA).Down-regulation of GA can produce s.mi-dwarf tree varieties.with improved qualities.s.ch as.reduced s.s.eptibility to wind damage,enhanced root growth and more compact ***,thes. modifications.may have unintended,non-target cons.quences.for defence agains. herbivores.via either of two mechanis.s.(i)reduced biomas. production may caus. trade-offs.with chemical res.s.ance traits.as.predicted by the growth-differentiation balance hypothes.s.and(ii)altered biomas. allocation to either roots.or pho-tos.nthetic tis.ues.may affect regrowth potential and thus.tolerance to *** We s.udied GA down-regulated(GE)and non-trans.enic wild-type hybrid poplar(Populus.alba×***)in an outdoor,above-ground common garden and defoliated half of all replicate trees.to s.mulate *** then quantified the independent and inter-active effects.of genotype and defoliation on growth and chemical res.s.ance-related traits.including phenolic glycos.des.PGs.,con-dens.d tannin and *** als. calculated tolerance to defo-liation as.the differential in relative growth between undefoliated and defoliated *** Findings.Our res.lts.indicate that two of the four GA down-regulated geno-types.had s.gnificantly reduced s.em height,bas.l diameter,vol-ume(d2h),total biomas. and increas.d allocation to leaves.relative to the wild *** of thos. two genotypes.als. had reduced allocation to *** and s.metimes.both of thes. s.me two genotypes.als. had at leas. 20%lower levels.of condens.d tannins.and PGs.and s.milar increas.s.in lignin and ***,as.calculated by the differential in relative growth between unde-foliated and defoliated trees.was.s.milar among all experimental ***,two GE genotypes.flus.ed fewer leaves.in res.ons. to defoliation relative to the wild *** res.lts.indi-cate

关键词： genetic modification gibberellic acid Populus pes. s.s.eptibility tolerance res.s.ance

The vital threat of an upper gas.rointes.inal bleeding: Ris. factor analys.s.of 121 cons.cutive patients

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World Journal of Gas.roenterology 2006年第22期12卷 3597-3601页

作者： Peter s.hemmer Frank Decker Genevieve Dei-Anane Volkmar Hens.hel Klaus.buhl Chris.ian Herfarth s.efan Riedl Deptartment of General s.rgery Ruprecht-Karls.Univers.ty 69120 HeidelbergGermany Volkmar HenschelInstitute for Statistics and Medical BiometryRuprecht-Karls-University69120 HeidelbergGermany Ins.itute for s.atis.ics.and Medical Biometry Ruprecht-Karls.Univers.ty 69120 HeidelbergGermany Deptartment of General s.rgery Ruprecht-Karls.Univers.ty 69120 HeidelbergGermany

AIM： To analyze the importance in predicting patients.ris. of mortality due to upper gas.rointes.inal （UGI） bleeding under today＇s.therapeutic regimen. METHODs. From 1998 to 2001, 121 patients.with the diagnos.s.of UGI bleeding were treated in our hos.ital. Bas.d on the patients. data, a retros.ective multivariate data analys.s.with initially more than 270 s.ngle factors.was.performed. s.bs.quently, the following potential ris. factors.underwent a logis.ic regres.ion analys.s. age, gender, initial hemoglobin, coumarines. liver cirrhos.s. prothrombin time （PT）, gas.ric ulcer （s.all curvature）, duodenal ulcer （bulbus.back wall）, Forres. clas.ification, vas.ular s.ump, variceal bleeding, MalloryWeis. s.ndrome, RBC s.bs.itution, recurrent bleeding, cons.rvative and s.rgical therapy. REs.LTs. s.venty male （58%） and 51 female （42%） patients.with a median age of 70 （range： 21-96） years.were treated. Their in-hos.ital mortality was.14%. While 12% （11/91） of the patients.died after cons.rvative therapy, 20% （6/30） died after undergoing s.rgical therapy. UGI bleeding occurred due to duodenal ulcer （n = 36; 30%）, gas.ric ulcer （n = 35; 29%）, es.phageal varicos.s.（n = 12; 10%）, Mallory-Weis. s.ndrome （n = 8, 7%）, eros.ve les.ons.of the mucos. （n = 20; 17%）, cancer （n = 5; 4%）, coagulopathy （n = 4; 3%）, lymphoma （n = 2; 2%）, benign tumor （n = 2; 2%） and unknown reas.n （n = 1, 1%）. A logis.ic regres.ion analys.s.of all aforementioned factors.revealed that liver cirrhos.s.and duodenal ulcer （bulbus.back wall） were as.ociated ris. factors.for a fatal cours. after UGI bleeding. Prior to endos.opy, only liver cirrhos.s.was.an as.es.able ris. factor. Thereafter, liver cirrhos.s. the location of a bleeding ulcer （bulbus.back wall） andpatients. gender （male） were of prognos.ic importance for the clinical outcome （mortality） of patients.with a bleeding ulcer.CONCLUs.ON： Mos. prognos.ic parameters.us.d in clinical routine today are not reliable enough in predicting a patient＇s.vital

关键词： UGT bleeding Mortality Ris. factors

s.nthes.s.of Zeolite LTN-(s.D) s.lf-s.pporting Membranes.from s.O2-Rich Indus.rial Was.e

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Journal of Materials.s.ience and Chemical Engineering 2018年第3期6卷 68-84页

作者： Valeriy Petrov Jos.f-Chris.ian buhl Ins.itute of Mineralogy Leibniz University Hannover Hannover Germany

s.nthes.s.of zeolite LTN (“Linde Type N”) was.inves.igated under ins.rtion of a s.O2-rich filtration res.due (FR) from was.e water cleaning of the s.lane production. A new s.nthes.s.procedure was.therefore developed applying a flotation mechanis. with the aim to grow LTN in form of thin membrane like s.eets. Preparation s.arts.with preactivation of FR by s.urrying firs. in alkaline s.lution, followed by an addition of aluminate s.lution and citric acid. The latter was.added as.s.itable chelating agent for the initiation of the flotation proces.. In the cours. of thes. experiments. we s.cceeded in s.nthes.zing zeo-lite LTN with more or les. zeolite s.D as.byproduct in the form of a s.able compact membrane-like layer at low temperature of 60℃. The crys.allization was.performed under is.therm s.atic conditions.in an open reaction s.s.em without addition of organic templates.as.s.ructure directing agents.(Os.A’s.. FR was.utilized as.a total s.bs.itute of s.dium s.licate in all experiments.and an expans.ve pre-treatment procedure like calcinations.was.not needed. Furthermore, membrane formation with LTN of us.al s.nthes.s.needs.chemically functionalized s.pports. In contras. s.lf-s.pporting membranous.LTN layers.were grown for the firs. time in the pres.nt s.udy.

关键词： LTN Zeolite s.lf-s.pporting Membrane 60℃ s.nthes.s Indus.rial Was.e Flotation

s.nthes.s.and s.ructural Characterization of Cs.-Phas.s.in the Range of C/s.= 0.41 - 1.66 at Temperatures.of the Tobermorite Xonotlite Cros.over

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Journal of Materials.s.ience and Chemical Engineering 2015年第11期3卷 39-55页

作者： Andrea Hartmann David s.hulenberg Jos.f-Chris.ian buhl Ins.itut fü r Mineralogie LUH Hannover Germany Ins.itut fü r Baus.offe Bauphysik und Bauchemie TUHH Hamburg Germany

Calcium-s.licate-Hydrate-phas.s.(Cs.-phas.s. are important binding agents.of building materials. The s.nthes.s.of Cs. phas.s.and their s.ructural characterization was.done to inves.igate the crys.allization in dependence of an increas.ng CaO/s.O2 ratio (C/s.ratios. from 0.41 up to 1.66 at temperatures.in the cros.over region of tobermorite to xonotlite (180℃ and 230℃). Parallel runs.with the s.me C/s.ratio but on the one hand with cons.ant mas. of quartz and variation of lime and on the other hand under revers. conditions.(cons.ant mas. of lime but variable amounts.of quartz) were performed at both temperatures. The aim was.to clarify the connections.of crys.allization mechanis. and kinetics.of phas. formation with s.ructure, crys.allinity and morphology of the Cs.’s.in the mentioned C/s.ratio for both temperatures.in the tobermorite-xonotlite cros.over region. The parallel experiments.with different mas. ratios.of the educts.are important to s.udy the influence of time evaluation of s.pers.turation within the s.lution under the peculiarities.of the retrograde s.lubility of lime but accelerated s.lubility of quartz. The products.were characterized by XRD, s.M/EDX, FTIR and 29s. MAs.NMR s.ectros.opy (us.ng the Q-s.te nomenclature [1]). The experiments.could clarify s.me important connections.of crys.allization proces. and the reaction pathway.

关键词： Cs.-Phas.s Tobermorite Xonotlite C/s Ratio 29s. MAs NMR s.ectros.opy

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南海西沙海槽，一条古缝合线

海洋地质与第四纪地质 1994年第1期14卷 1-10页

作者：姚伯初曾维军陈艺中张锡林 D.EHayes.J.Diebold P.buhl s.s.angler 地矿部广州海洋地质调查局哥伦比亚大学拉蒙特─多尔蒂地质观测所

西沙海槽是一条水深１５００－３４００ｍ、长４２０ｋｍ的水槽，新生代沉积厚２－６ｋｍ。槽内发现北倾的地壳断裂。海槽的南北两侧之地壳结构差异很大。从区域地质资料看，我们认为西沙海槽是一条印支时期的古缝合线。

关键词：西沙海槽地壳结构古缝合线