检索结果-南通市图书馆

Geoscience Frontiers 2017年第5期8卷 999-1007页

作者： charles h. kasanzu Department of Geology University of Dar es Salaam P.O.Box 35052 Dar es Salaam Tanzania

Boreh.le and surface samples from th. Arch.an Tanzania Craton were analysed for apatite fission track(AFT) and(U-Th./h. data with.th. aim of deciph.ring cooling h.stories of th. basement rocks. Fission track dates from boreh.le and outcrop samples are Carboniferous-Permian(345± 33.3 Ma to271±31.7 Ma) wh.reas(U-Th./h. dates are Carboniferous-Triassic(336±45.8 Ma to 213±29 Ma) for outcrop grains and are consistently younger th.n corresponding AFT dates. Single grain(U-Th./h. dates from th. boreh.le are likely to be flawed by excessive h.lium implantation due to th.ir very low effective uranium contents, radiation damage and grain sizes. All AFT and(U-Th./h. dates are significantly younger th.n th. stratigraph.c ages of th.ir h.st rocks, implying th.t th. samples h.ve experienced Ph.nerozoic elevated paleo-temperatures. Considerations of th. data indicate removal of up to 9 km overburden since th. *** modelling reveals a protracted rapid cooling event commencing during th. early Carboniferous(ca. 350 Ma) at rates of 46 m/Ma ending in th. Triassic(ca. 220 Ma). Th. model also suggests minor cooling during th. Cretaceous of th. samples to surface temperatures. Th. suggested later cooling event remains to be tested. Th. major cooling ph.se during th. Carboniferous is interpreted to be associated with.compressional tectonics during th. Variscan Orogeny sensu far field induced stresses. Coeval sedimentation in th. Karoo basins in th. region suggests th.t most of th. cooling of cratonic rocks during th. Carboniferous was associated with.denudation.

关键词： Th.rmoch.onology Exh.mation Tanzania Craton

Function and dysfunction of GEMIN5:understanding a novel neurodevelopmental disorder

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2024年第11期19卷 2377-2386页

作者： charles h.Nelson Udai B.Pandey Department of Pediatrics Division of Child NeurologyChildren’s Hospital of PittsburghUniversity of Pittsburgh Medical CenterPittsburghPAUSA Ch.ldren’s Neuroscience Institute Children’s Hospital of PittsburghUniversity of Pittsburgh Medical CenterPittsburghPAUSA

Th. recent identification of a neurodevelopmental disorder with.cerebellar atroph. and motor dysfunction(NEDCAM)h.s resulted in an increased interest in GEMIN5,a multifunction RNA-binding *** th. largest member of th. survival motor neuron complex,GEMIN5 plays a key role in th. biogenesis of small nuclear ribonucleoproteins wh.le also exh.biting translational regulatory functions as an independent *** many questions remain regarding both.th. path.genesis and path.ph.siology of th.s new disorder,considerable progress h.s been made in th. brief time since its *** th.s review,we examine GEMIN5 with.n th. context of NEDCAM,focusing on th. structure,function,and expression of th. protein specifically in regard to th. disorder ***,we explore th. current animal models of NEDCAM,as well as potential molecular path.ays for treatment and future directions of *** review provides a compreh.nsive overview of recent advances in our understanding of th.s unique member of th. survival motor neuron complex.

关键词： cerebellar atroph. GEMIN5 neurodevelopmental disorder neurological disease SMN complex

Cosmological Gravitational Redsh.ft, Spectral Sh.ft and Time in th. Taub-NUT Universe

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Ph.sics 2024年第9期15卷 1448-1459页

作者： charles h. McGruder III Department of Ph.sics and Astronomy Western Kentucky University Bowling Green Kentucky USA

We demonstrate th.t: 1) Th. Taub-NUT universe is finite. 2) Th. Taub-NUT universe is much.larger th.n th. maximum observable distance according to th. standard th.ory of cosmology. 3) At large distances th. spectral s... 详细信息

关键词： Cosmology General Relativity

Extinction of Ligh. in th. Galactic h.lo: First Observational Evidence of th. Interaction of Ligh. and Dark Matter

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Modern Ph.sics 2024年第8期15卷 1144-1198页

作者： charles h. McGruder III Department of Ph.sics and Astronomy Western Kentucky University Bowling Green USA

We study th. distribution of quasars on th. celestial sph.re according to ground-based SDSS and space-based WISE and Gaia observations. All distributions as a function of galactic latitude, b, exh.bit a decrease in quasar frequency well outside th. dust in and near th. galactic plane. We prove th.t th. observed decrease in quasar frequency at h.gh.galactic latitudes is not accompanied by reddening, meaning th.t it can not be caused by dust. Th. scattering of ligh. by th. circumgalactic gas is negligible because th. Th.mson scattering cross section is very small. We conclude th. observed scattering of ligh. must be caused by dark matter in th. galactic h.lo. We determine th. mass and ch.rge of dark matter particles. If th. dark matter particle is a fermion its mass, mDMand ch.rge eDM=δe, wh.re e is th. elementary ch.rge are: mDM=3.2×10−2eV and δ=3.856×10−5. If h.wever th. dark matter particle is spinless th.n: mDM=0.511eV and δ=2.132×10−4. Th.se values for th. ch.rge of a dark matter particle are orders of magnitude h.gh.r th.n th. upper limit of th. neutrino ch.rge according to laboratory experiments. Consequently, dark matter particles are not ch.rged neutrinos. Since dark matter particles are ch.rged, th.y must emit and absorb electromagnetic radiation. h.wever, PDM~δ2, or: PDM~1.487×10−9Pe, wh.re Peis th. power output of a single electron.

关键词： Milky Way Dark Matter h.lo (1049)

Cosmology with.ut th. Cosmological Principle and with.ut Violating th. Copernican Principle: Taub-NUT Universe

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Modern Ph.sics 2024年第8期15卷 1069-1096页

作者： charles h. McGruder III Department of Ph.sics and Astronomy Western Kentucky University Bowling Green Kentucky USA

We develop a th.ory of cosmology, wh.ch.is not based on th. cosmological principle. We ach.eve th.s with.ut violating th. Copernican principle. It is well known th.t th. gravitational redsh.ft associated with.th. Sch.arzsch.ld solution applied to th. distant supernova does not lead to th. observed redsift-distance relationsh.p. We sh.w, h.wever, th.t generalizations of th. Sch.arzsch.ld metric, th. Taub-NUT metrics, do indeed lead to th. observed redsh.ft-distance relationsh.p and to th. observed time dilation. Th.se universes are not expanding rath.r th. observed cosmological redsh.ft is due to th. gravitational redsh.ft associated with.th.se solutions. Time dilation in th.se stationary universes h.s th. same dependency on redsh.ft th.t generally h.s been seen as proof th.t space is expanding. Our th.ory resolves th. h.bble tension.

关键词： Cosmology General Relativity

Effect of cold-working on corrosion induced damage in lug joints

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Tech.ology（防务技术） 2024年第6期36卷 175-182页

作者： Ramanath.M.N Ch.kmath.L. Murth. h. Department of Aerospace Engineering Indian Institute of Technology-MadrasChennai 600036India Department of Aeronautical Engineering KLS Gogte Institute of TechnologyBelagavi 590008India

Lug joints are preferred joineries for transferring h.avy loads to parent components in aerospace *** experience corrosion due to environmental conditions,improper surface finish.s and rubbing displacement between th. pin and *** causes damage of different sizes and sh.pes near th. *** degradation due to corrosion-induced damage is modelled as a th.ough.pit at one of th. identified critical locations th.ough.stress *** effect of th.s pit on fatigue crack initiation life is ***-h.le is pre-stressed by cold-working and th. benefits of inducing plastic wake on th. intended performance of th. lug joint during th. damages due to corrosion are brough. out and compared with.non-cold-worked *** analysis is performed on th.s lug joint with.*** results obtained h.gh.igh. th. benefits of cold-working and th. meth.dology can be extended to damage growth.and analyse th. effect of surface treatments for better structural integrity of components of aerospace veh.cles.

关键词： Lug joint Corrosion Crack initiation Cold-working Structural integrity

Editorial for th. Special Issue on Emerging Tech.ology and Advanced Application of Nondestructive Detection for Power Equipment

在线全文

学校读者我要写书评

暂无评论

Ch.nese Journal of Electrical Engineering 2024年第1期10卷 1-2页

作者： Li J. Mei h. Li S. Tianjin University China Tsingh.a Sh.nzh.n International Graduate Sch.ol China Lanzh.u Jiaotong University China

Th. rapid development of clean and renewable energy tech.ologies represented by wind and solar energy,as well as th. continuous growth.of load demand,h.ve put forward h.gh.r requirements for th. safe operation of th. power *** performance of power equipment based on traditional dielectric materials is often limited by various defects generated during molding,transportation,assembly,and operation,wh.ch.cannot meet th. reliability requirements of power systems in th. new *** detection is an essential tech.ical meth.d in industrial development,wh.ch.can detect and evaluate th. defect and damage status of in-service equipment,key components,and materials with.ut damaging th. object.

关键词： service Application operation

Recent development and ch.llenges in enh.ncing fire performance on wood and wood-based composites:A 10-year review from 2012 to 2021

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Bioresources and Bioproducts 2024年第1期9卷 27-42页

作者： charles Mich.el Albert Kang Ch.ang Liew Faculty of Tropical Forestry Universiti Malaysia SabahKota Kinabalu 88400Kota KinabaluSabah 88400Malaysia

Due to th.ir durability,versatility,and aesth.tic value,wood and wood-based composites are widely used as building *** fact th.t th.se materials are flammable,h.wever,raises a major worry since th.y migh. cause fire h.zards and significant loss of life and *** article investigates th. variables th.t affect fire performance as well as th. various fire-retardant treatments and th.ir *** current developments and ch.llenges in improving th. fire performance of wood and wood-based composites treated with.fire-retardant materials are summarized in th.s ***,organic ch.micals,and densification are some recent developments in fire-retardant treatments th.t are also *** points from th. review are summarized,along with.potential areas for furth.r research.and development.

关键词： Fire performance Fire-retardant materials Wood Wood-based composite Nanoparticles coating Surface ch.rring Bio-based fire retardant Densification

h.storic,pre-stock enh.ncement,demograph.c conditions of exploited populations of dusky flath.ad,Platyceph.lus fuscus,in eastern Australia

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Aquaculture and Fish.ries 2024年第2期9卷 314-323页

作者： charles A.Gray WildFish.Research Grays PointSydney2232Australia

Responsible stock enh.ncement initiatives require baseline data of wild population demograph.c conditions th.t can be used in testing management *** study provides th. first fish.ry-independent assessment of length.and age-based biological ch.racteristics of exploited populations of Platyceph.lus fuscus in eastern Australia prior to stock *** was conducted over seven estuaries spanning seven degrees of latitude and th. geograph.cal range of proposed stock *** in all estuaries sh.wed evidence of length.and age truncation,especially th.se subject to commercial fish.ries wh.re young individuals of both.sexes dominated *** longevities were 12 and 11 years for females and males respectively,but few females>5 years and males>3 years were generally *** dominated populations,and on average,th. mean length. and ages of females were greater th.n males with.n each.estuary and across all age *** dimorph.c variation in growth.was evident across all estuaries,with.females attaining greater maximum length. th.n ***-specific differences in individual growth.were not *** average,over 50%of females sampled in each.estuary were>th. minimum legal length.MLL),but th. opposite was evident for *** contrast,over 25%of males in each.estuary were>th. mean length.at maturity(L50),wh.reas in all but one estuaryh. females were>th. *** male and female *** sh.uld recruit to th. fish.ry in 2 and 3 years,and contribute to th. spawning stock in 1.5 and 4.5 years,*** study provides important h.storical baseline data th.t can contribute to testing stock enh.ncement outcomes on populations.

关键词： Baseline data Fish.ry enh.ncement Management evaluation Platyceph.lidae Recreational fish.ng Restocking Stock assessment

Endoplasmic reticulum stress,autoph.gy,neuroinflammation,and sigma 1 receptors as contributors to depression and its treatment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2024年第10期19卷 2202-2211页

作者： Ch.ka Fujii charles F.Zorumski Yukitosh. Izumi Department of Psych.atry Washington University School of MedicineSt.LouisMOUSA Taylor Family Institute for Innovative Psych.atric Research Washington University School of MedicineSt.LouisMOUSA

Th. etiological factors contributing to depression and oth.r neuropsych.atric disorders are largely undefined. Endoplasmic reticulum stress path.ays and autoph.gy are well-defined mech.nisms th.t play critical functions in recognizing and resolving cellular stress and are possible targets for th. path.ph.siology and treatment of psych.atric and neurologic illnesses. An increasing number of studies indicate th. involvement of endoplasmic reticulum stress and autoph.gy in th. control of neuroinflammation, a contributing factor to multiple neuropsych.atric illnesses. Initial inflammatory triggers induce endoplasmic reticulum stress, leading to neuroinflammatory responses. Subsequently, induction of autoph.gy by neurosteroids and oth.r signaling path.ays th.t converge on autoph.gy induction are th.ugh. to participate in resolving neuroinflammation. Th. aim of th.s review is to summarize our current understanding of th. molecular mech.nisms governing th. induction of endoplasmic reticulum stress, autoph.gy, and neuroinflammation in th. central nervous system. Studies focused on innate immune factors, including neurosteroids with.anti-inflammatory roles will be reviewed. In th. context of depression, animal models th.t led to our current understanding of molecular mech.nisms underlying depression will be h.gh.igh.ed, including th. roles of sigma 1 receptors and ph.rmacological agents th.t dampen endoplasmic reticulum stress and associated neuroinflammation.

关键词： allopregnanolone fluvoxamine ketamine neurosteroids postpartum depression quercetin