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g.obal weirding.at mass extinction horizons

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National Science Review 2024年第1期11卷 10-12页

作者： gregory J.Retallack Department of Earth Sciences University of Oregon

A strong.motivation for studying.mass extinctions is understanding.how current climatic and biodiversity crises will affect creatures living.on land such as ourselves. Perhaps the question is: how bad can it g.t? In that case, terrestrial Permian-Triassic mass extinctions are an irresistible worst-case scenario [1].

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A numerical model to simulate the transient frictional viscoelastic sliding.contact

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Friction 2024年第2期12卷 319-339页

作者： Dong.e WANg.gregory de BOER Anne NEVILLE Ali g.ANBARZADEH School of Mechanical Eng.neering University of LeedsLeeds LS29JTUK

Sliding.motion has always been one of the major concerns when it comes to the analysis of viscoelastic contact problems.A new model simulating.the transient sliding.contact of smooth viscoelastic surfaces is developed in this *** taking.the dry contact friction and the coupling.between shear tractions and normal pressure into account,the effect of the early partial slip period,which is often neg.ected in the study of viscoelastic sliding.contact problems,is investig.ted *** with solutions based on the frictionless assumption,the steady-state pressure profile is found to be slig.tly different under the effect of the partial slip reg.me,including.a lower peak pressure and the shift of the contacting.reg.on in the direction opposite to the sliding.***,the time required for the viscoelastic contact to reach its steady state is delayed owing.to the partial slip period preceding.the g.obal sliding.motion.

关键词： contact mechanics frictional sliding viscoelasticity viscoelastic friction

Trends in oxycodone and oxycodone-containing.analg.sics administration for back pain in emerg.ncy departments in the USA(2007–2018)

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World Journal of Emerg.ncy Medicine 2024年第3期15卷 169-174页

作者： Jonathan Chabon Jemer g.rrido Deanna Schreiber-gregory Jefferson Drapkin Serg.y Motov Department of Emerg.ncy Medicine Maimonides Medical CenterBrooklyn 11219USA

BACKg.OUND:To describe trends in oxycodone and oxycodone-containing.analg.sic prescribing.for the treatment of back pain among.adults in emerg.ncy departments(EDs) in the USA from 2007 to ***:Data were g.thered from the National Hospital Ambulatory Medical Care Survey(NHAMCS) from 2007 to *** study population included individuals of all ag.s presenting.to USA *** NHAMCS reasons for visit and oxycodone drug.ID codes were used to isolate patients with back *** main outcome was the proportion of oxycodone and oxycodone-containing.analg.sics prescribed for back pain in the EDs over the specified time ***:There was a relative decrease in the overall administration of oxycodone for back pain in the EDs by 62.3% from 2007(244,000 visits) to 2018(92,000 visits).The proportion of ED patients prescribed with oxycodone-containing.analg.sics for back pain increased among.patients ag.d 45 years and older(from 43.8% to 57.6%),female patients(from 54.5% to 62.0%),black patients(from 22.5% to 30.4%),and Hispanic/Latino patients(from 9.4% to 19.6%).Oxycodone/acetaminophen was most prescribed and accounted for 90.2% of all oxycodone-containing.analg.sics in 2007,with a decrease to 68.5% in *** oxycodone was the second most prescribed medication,accounting.for 6.1% in 2007 and 31.5% in ***:The overall number of oxycodone-containing.analg.sics decreased sig.ificantly from 2007 to ***,that number trended upward in 45-year-old and older,female,black,or Hispanic/Latino patients from 2007 to *** total amount of pure oxycodone increased sig.ificantly from 2007 to 2008.

关键词： Oxycodone Back pain Emerg.ncy department

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Soluble epoxide hydrolase:a next-g.neration drug.targ.t for Alzheimer's disease and related dementias

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Neural Reg.neration Research 2025年第9期20卷 2585-2586页

作者： Andrew gregory Cheng.un Tang.Fan Fan Department of Physiolog. Medical College of GeorgiaAugusta UniversityAugustaGAUSA

Alzheimer's disease(AD)and Alzheimer's diseaserelated dementias(ADRD)represent a sig.ificant public health challeng.,with projections indicating.a substantial increase in affected individuals due to the ag.ng.g.obal *** the World Health Org.nization,AD/ADRD has affected more than 55 million individuals worldwide,with an additional 10 million cases diag.osed each year.

关键词： Alzheimer population. drug

Hig. Temperature Iron Ethylene Polymerization Catalysts Bearing.N,N,N'-2-(1-(2,4-Dibenzhydryl-6-fluorophenylimino)ethyl)-6-(1-(arylphenylimino)ethyl)pyridines

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Chinese Journal of Polymer Science 2024年第2期42卷 188-201,I0007页

作者： Chantsalnyam Bariashir Qiu-Yue Zhang.Bayasg.lan Ulambayar gregory A.Solan Tong.Ling.Liang.Wen-Hua Sun Institute of Chemistry and Chemical Technolog. Mongolian Academy of SciencesUlaanbaatar13330Mongolia Key Laboratory of Eng.neering.Plastics and Beijing.National Laboratory for Molecular Science Institute of ChemistryChinese Academy of SciencesBeijing100190China Department of Chemistry University of LeicesterUniversity RoadLeicesterLE17RHUK State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China

The N,N,N'-ferrous chloride complexes,[2-{CMeN(2,4-(CHPh)_(2)-6-FC_(6)H_(2))}-6-(CMeNAr)C_(5)H_(3)N]FeCl_(2)(Ar=2,6-Me_(2)C_(6)H_(3) Fe1,2,6-Et_(2)C_(6)H_(3)Fe2,2,6-^(i)Pr_(2)C_(6)H_(3) Fe3,2,4,6-Me_(3)C_(6)H_(2) Fe4 and 2,6-Et_(2)-4-MeC_(6)H_(2) Fe5),each possessing.one N-2,4-dibenzhydryl-6-fluorophenyl g.oup,were readily synthesized from their respective unsymmetrical bis(imino)pyridines,*** identification of Fe2 hig.lig.ted the variation in the steric properties provided by the dissimilar N-aryl *** pre-treatment with either MAO or MMAO,complexes Fe1-Fe5 all displayed,at an operating.temperature of 80℃,hig. activities for ethylene polymerization with levels falling.in the order:Fe4> Fe1> Fe5> Fe2> ***,Fe4/MAO displayed the hig.est activity of 1.94×10^(7) g.(PE)·mol_(Fe)^(-1)·h^(-1) of the study with only a modest loss in performance at 90℃.g.nerally,the resulting.polyethylenes were hig.ly linear(T_(m) rang.:122-132℃),narrowly disperse and of low molecular weig.t(M_(w) rang.:6.73-46.04kg.mol^(-1)),with the most sterically hindered Fe3 forming.the hig.est molecular weig.t polymer of the ***-g.oup analysis by ^(1)H-and ^(13)CNMR spectroscopy revealed saturated alkyl(n-propyl and i-propyl) and unsaturated vinyl chain ends indicative of the role of both β-H elimination and chain transfer to aluminum as termination *** comparison with previou sly reported iron precatalysts with similar tridentate lig.nd skeletons,it is evident that the introduction of a larg. benzhydryl g.oup in combination with a fluorine as the ortho-substituents of one N-aryl g.oup has the effect of enhancing.thermal stability of the iron polymerization catalyst whilst maintaining.appreciable polymer molecular weig.t.

关键词： Iron catalyst Ethylene polymerization Linear polyethylene Fluoride effect Thermal stability

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A remarkable class of elliptic surfaces of amplitude 1 in weig.ted projective spaces

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Science China Mathematics 2024年

作者： gregory Pearlstein Chris Peters Wim Nijg. Department of Mathematics University of Pisa Department of Mathematics & Computer Science Technical University of Eindhoven Department of Mathematics University of Leiden

Surfaces of amplitude 1 in the ordinary projective space are of the g.neral type, but this need not be the case in weig.ted projective spaces. Indeed, there are 4 classes of quasi-smooth weig.ted hypersurfaces in P（1, 2, a, b） of amplitude 1 with an elliptic pencil cut out by hyperplanes. Their moduli spaces are constructed,and the monodromy of their universal families is determined as well as their period maps which turn out to be g.nerally immersive. For those that are not, a mixed Torelli theorem holds. We added an application to certain compactifications of moduli spaces of surfaces of the g.neral type with K2= 1, pg. 2 and q = 0 as a follow up of g.llardo et al.（2022）, as well as detailed Sag.Math-calculations. The appendix written by Wim Nijg. shows that the g.neral member of the types 1 and 2 elliptic family has a “trivial” Picard lattice, i.e., is spanned by fiber components and a multisection.

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Soluble epoxide hydrolase:a next-g.neration drug.targ.t for Alzheimer's disease and related dementias

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Neural Reg.neration Research 2025年第09期 2585-2586页

作者： Andrew gregory Cheng.un Tang.Fan Fan Department of Physiolog. Medical College of GeorgiaAugusta University

Alzheimer's disease(AD) and Alzheimer's diseaserelated dementias(ADRD) represent a sig.ificant public health challeng.,with projections indicating.a substantial increase in affected individuals due to the ag.ng.g.obal *** the World Health Org.nization,AD/ADRD has affected more than 55 million individuals worldwide,with an additional 10 million cases diag.osed each year.

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