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Comparison of mantle lithosphere beneath early triassic kimberlite fields in siberian craton reconstructed from deep-seated xenocrysts

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Geoscience Frontiers 2016年第4期7卷 639-662页

作者： I.V.Ashchepkov s.s.Kuligin n.V.Vladykin h.Downes M.A.Vavilov E.n.nigmatulina s.A.Babushkina n.s.tychkov O.s.Khmelnikova lnstitute of Geology and Mineralogy sD RAs Koptyug ave 3NovosibirskRussia Institute of Geochemistry sD RAs Favorskky str laIrkutskRussia Department of Earth and Planetary sciences Birkbeck University of LondonLondonUK Institute of Geology of Diamonds and noble metals sD RAs Lenina ave 39YakutskRussia

Mantle xenocrysts from early triassic kimberlite pipes from Kharamai, Ary-Mastakh and Kuranakh fields in the Anabar shield of siberia revealing similar compositional trends were studied to estimate the superplume influence on the subcratonic lithosphere mantle （sCLM）. Pressure-temperature （Pt） reconstructions using monomineral thermobarometry for 5 phases show division of the sCLM beneath the Kharamai field into 6 units： pyroxenitic Fe-rich （1-2 GPa） and Mg-rich （2-3 GPa） layers; middle with two levels of Gar-sp pyroxenites at - 3 and 4-5 GPa; Gar-dunite-harzburgites - 4.5-6.5 GPa subjected to llm-Px vein metasomatism; and a Mg-rich dunite lower part. In the Anabar shield （Ary-Mastakh, Dyuken and Kuranakh fields） mantle lithosphere is composed of three large units divided into two parts： upper part with amphiboles and phlogopite; two levels of pyroxenites and eclogites at 3 and 4 GPa, and a lower part composed of refertilized dunites. Diagrams showing P-Fe#Gar clusters for garnets and omphacites illustrate the differences between sCLM of these localities. Differences of triassic sCLM from Devonian sCLM are in simple layering; abundance of na-Cr-amphiboles and metasomatism in the upper sCLM part, thick pyroxenite-eclogite layer and lower part depletion, heated from sCLM base to 5.0 GPa. Kharamai mantle clinopyroxenes represent three geochemical types：（1） harzburgitic with inclined linear REE, hFsE troughs and elevated th, U; （2） lherzolitic or pyroxenitic with round tRE patterns and decreasing incompatible elements; （3） eclogitic with Eu troughs, Pb peak and high LILE content. Calculated parental melts for garnets with humped REE patterns suggest dissolution of former Cpx and depression means Cpx and garnets extraction. Clinopyroxenes from Ary-Mastakh fields show less in- dined REE patterns with hMREE troughs and an increase of incompatible elements. Clinopyroxenes from Kuranakh field show flatter spoon-like REE patterns and peaks in Ba, U, Pb and st, similar to th

关键词： Mantle lithosphere Monomineral thermobarometry Mineral geochemistry triassic kimberlite Layering

Comorbid psoriasis-bipolar disorder successfully treated with apremilast:much more than a mere coincidence?

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General Psychiatry 2020年第3期33卷 194-196页

作者： n A Uvais s V Rakhesh t P Afra n A Bishurul hafi Muhammed Razmi t Psychiatry lqraa International Hospital and Research CentreCalicutKeralaIndia Dermatology lqraa International Hospital and Research CentreCalicutKeralaIndia

Psoriasis is a chronic,immune mediated,systemic inflammatory skin disease with a reported prevalence of 0.6%-4.8%in the general *** disorder(BP)is a severe episodic psychiatric disorder that ranks as the fourth leading cause of *** evidence suggests that genetic and immunological factors play a significant role in the developmeht of both *** have also shown a higher association of psychiatric disorders among patients with ***,several autoimmune comorbidities have been reported in association with ***,we describe a young woman with BP who developed psoriasis after 1 year of developing BP and showed exacerbations in psoriasis lesions with each manic *** also highlight the safe and efficacious use of apremilast for psoriatic lesions in the woman.

关键词： psoriasis morbid autoimmune

Effects of Weaving Laser on Weld Microstructure and Crack for Al 6k21-t4 Alloy

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Journal of Materials science & technology 2011年第1期27卷 93-96页

作者： B.h.Kim n.h.Kang W.t.Oh C.h.Kim J.h.Kim Y.s.Kim Y.h.Park Department of Materials science and Engineering Pusan National UniversitySan30Jangjeon-dongGeumjeong-guBusan 609-735Korea Department of Materials and Components Engineering Dong-Eui UniversityBusan 614-714Korea Advanced Joining technology team KITECH7-47Songdo-dongYeonsu-guIncheon 406-840Korea Division for Dongnam Area technology service KITECHJisa-dongGanseo-guBusan 618-230Korea

For Al 6k21-t4 overlap weld joint,the shear-tensile strength by using the weaving laser was improved as compared to the case of linear *** the specimen of low strength,the porosity was distributed continuously along the intersection between the plates and fusion ***,for the optimized welding condition,large oval-shaped porosities were located only in the advancing track of the concave ***,the continuity of cracks and porosities played a key role to determine the ***,the weaving width was also the important parameter to control the ***,the concave part had more significant hot and cold cracking in the weld and heat-affected zone（hAZ）,respectively,than the convex part.

关键词： Weaving laser Weld microstructure Void Al alloy

Alakit and Daldyn kimberlite fields,siberia,Russia:two types of mantle sub-terranes beneath central Yakutia?

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Geoscience Frontiers 2017年第4期8卷 671-692页

作者： I.V.Ashchepkov A.M.Logvinova t.ntaflos n.V.Vladykin s.I.Kostrovitsky Z.spetsius s.I.Mityukhin s.A.Prokopyev n.s.Medvedev h.Downes Institute of Geology and Mineralogy sD RAs Institute of Geochemistry sD RAs Dept.of Lithospheric Research University of Vienna Alrosa stock Company nikolaev Institute of Inorganic Chemistry 3 Department of Earth and Planetary sciences Birkbeck University of London

Mineral data from Yakutian kimberlites allow reconstruction of the history of lithospheric *** occur in compositions of mantle pyropes and clinopyroxenes from large kimberlite pipes in the Alakit and Daldyn *** the Alakit ***-diopsides are alkaline,and stykanskaya and some other pipes contain more sub-calcic pyropes and dunitic-type diamond inclusions,while in the Daldyn field harzburgitic pyropes are *** eclogitic diamond inclusions in the Alakit field are sharply divided in types and conditions,while in the Daldyn field they show varying compositions and often continuous Pressure-temperature（P-t） ranges with increasing Fe~# with decreasing *** Alakit,Crpargasites to richterites were found in all pipes,while in Daldyn,pargasites are rare Dalnyaya and Zarnitsa ***-diopsides from the Alakit region show higher levels of light Rare Earth Elements（LREE）and stronger REE-slopes,and enrichment in light Rare Earth Elements（LREE）,sometimes th-U,and small troughs in *** the Daldyn field,the high Field strength Elements hFsE troughs are more common in clinopyroxenes with low REE abundances,while those from sheared and refertilized peridotites have smooth *** from Alakit show hREE minima,but those from Daldyn often have a trough at Yand high U and ***/O2 diagrams from both regions show similarities,suggesting similar layering and *** degree of metasomatism is often higher for pipes which show dispersion in P-Fe~# trends for *** the mantle beneath Udachnaya and Aykhal,pipes show 6-7 linear arrays of P-Fe~# in the lower part of the mantle section at 7.5-3.0 GPa,probably reflecting primary subduction *** the sytykanskaya pipe,there are several horizons with opposite inclinations which reflect metasomatic *** high dispersion of the P—Fe~# trend indicating widespread metasomatism is associated with decreased diamond *** explanation of the differences in miner

关键词： thermobarometry Geochemistry Daldyn Alakit Craton Lithosphere

Conversion of an atomic to a molecular argon ion and low pressure argon relaxation

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Chinese Physics B 2016年第1期25卷 697-705页

作者： M n stankov A P Jovanovie V Lj Markovic s n stamenkovic Department of Physics Faculty of Sciences and MathematicsUniversity of Ni Viegradska 33Ni 18001Serbia

the dominant process in relaxation of DC glow discharge between two plane parallel electrodes in argon at pressure 200 Pa is analyzed by measuring the breakdown time delay and by analytical and numerical models. By using the approx- imate analytical model it is found that the relaxation in a range from 20 to 60 ms in afterglow is dominated by Ar＋ ions, produced by atomic-to-molecular conversion of Ar＋ ions in the first several milliseconds after the cessation of the discharge. this conversion is confirmed by the presence of double-Gaussian distribution for the formative time delay, as well as con- version maxima in a set of memory curves measured in different conditions. Finally, the numerical one-dimensional （1D） model for determining the number densities of dominant particles in stationary DC glow discharge and two-dimensional （2D） model for the relaxation are used to confirm the previous assumptions and to determine the corresponding collision and transport coefficients of dominant species and processes.

关键词： argon discharge afterglow relaxation fluid model plasma reactions

nonlinear-Optical Analogies in nuclear-Like soliton Reactions:selection Rules,nonlinear tunneling and sub-Barrier Fusion–Fission

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Chinese Physics Letters 2024年第8期41卷 1-7页

作者： t.L.Belyaeva V.n.serkin Universidad Autonoma del Estado de Mexico Av.Instituto Literario 100C.P.50000TolucaMexico Benemerita Universidad Autonoma de Puebla Av.4 Sur 104C.P.72001PueblaMexico

the main goal of our study is to reveal unexpected but intriguing analogies arising between optical solitons and nuclear physics,which still remain hidden from *** consider the main cornerstones of the concept of nonlinear optics of nuclear reactions and the well-dressed repulsive-core *** the base of this model,we reveal the most intriguing properties of the nonlinear tunneling of nucleus-like solitons and the soliton selfinduced sub-barrier transparency *** describe novel interesting and stimulating analogies between the interaction of nucleus-like solitons on the repulsive barrier and nuclear sub-barrier *** main finding of this study concerns the conservation of total number of nucleons(or the baryon number)in nuclear-like soliton *** show that inelastic interactions among well-dressed repulsive-core solitons arise only when a“cloud”of“dressing”spectral side-bands appears in the frequency spectra of the *** property of nucleus-like solitons is directly related to the nuclear density distribution described by the dimensionless small shape-squareness *** the Fourier spectra of nucleus-like solitons are similar to the nuclear form *** show that the nuclear-like reactions between well-dressed solitons are realized by“exchange”between“particle-like”side bands in their spectra.

关键词： solitons soliton nonlinear

Mantle-derived Xenoliths and the token of a Modern Back-Arc Geotherm Beneath Eastern China

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science China Chemistry 1994年第4期37卷 472-480页

作者：金振民 h.W.GreenII R.s.Borch 金淑燕 t.n.tingle t.E.Young Department of Geology university of CaliforniaDavisCA95616USA Department of Geology University of California Daves CA95616USA. Division of Geomechanics China University of Geosciences Wuhan 430074 PRC

Xenoliths of garnet and spinel-garnet 1herzolite from Mingxi, Eastern China have been studied in terms of comprehensive methods of mineralogy, petrology, fabrics, mierostructures and infrared spectrum. the temperature and pressure equilibration of the xenolith have been calculated using the tEMPEst program with the two-pyroxene geothermometer of Bertrand and Mercier (1985) combined with the geobarometer of nickel and Green (1985). the temperature and pressure of xenoliths range from^1300 K at 1. 9 GPa (60 km) to ~1500 K at 2. 6 GPa (80 km). the geotherm inferred from xenolith is excellently consistent with the measured surface heat flow (70 mW/m2) in Mingxi. A character of geothermal curve and conductive type suggest that these xenoliths are from the lithosphere, not from the asthenosphere. the geotherm and mierostructures and preferred orientations of minerals in the xenolith are consistent with tecon-ic thinning of the lithosphere in the present-day extensional back-arc environment.

关键词： mantle xenolith spinel-garnet Iherzolite geotherm thermal structure of the lithosphere extensional back-arc environment.

Development of non-shrinkable ceramic composites for use in high-power microwave tubes

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International Journal of Minerals,Metallurgy and Materials 2019年第4期26卷 516-522页

作者： n.Dandapat s.Ghosh Bioceramics and Coating Division CSIR-Central Glass and Ceramic Research Institute

Al_2O_3–CaO–siC-based ceramic composites with four different compositions were sintered at 1700℃ for 3 h in an air furnace. the phase analysis, microstructural characterization, and elemental composition determination of the developed composites were performed by X-ray diffraction(XRD), field-emission scanning electron microscopy(FEsEM), and energy-dispersive X-ray(EDAX) analysis, respectively. the shrinkage, thermal properties, and electrical resistivity of the composites were also studied. the experimental results showed the effects of adding silicon carbide and calcia to alumina on the thermal, electrical, and shrinkage properties of the resultant composites. Among the four investigated ceramic composites, the one composed of 99 wt% alumina, 0.5 wt% CaO, and 0.5 wt% siC exhibited the best characteristics for use as a potting material in a dispenser cathode of a microwave tube. the material exhibited slight expansion instead of shrinkage during drying or firing. Other properties of the composite powder, such as its thermal properties and electrical resistivity, were comparable to those of a commercial alumina powder.

关键词： Al2O3-CaO-siC composite expansion potting material dispenser cathode microwave tube

Lattice thermal conduction in cadmium arsenide

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Chinese Physics B 2022年第11期31卷 424-430页

作者： R F Chinnappagoudra M D Kamatagi n R Patil n s sankeshwar Department of Physics S.S.Government First Grade CollegeNargund-582207KarnatakaIndia Research Resource Centre Visvesvaraya Technological UniversityBelagavi-590018KarnatakIndia Department of Physics B V B College of Engineering and TechnologyHubliKarnataka 80031India Department of Physics&Electronics CHRIST(Deemed to be University)Bangalore-560029KarnatakaIndia

Lattice thermal conductivity(LtC)of cadmium arsenide(Cd_(3)As_(2))is studied over a wide temperature range(1–400 K)by employing the Callaway *** acoustic phonons are considered to be the major carriers of heat and to be scattered by the sample boundaries,disorder,impurities,and other phonons via both Umklapp and normal phonon *** calculations of LtC of Cd_(3)As_(2)bring out the relative importance of the scattering *** systematic analysis of recent experimental data on thermal conductivity(tC)of Cd_(3)As_(2)samples of different groups,presented in terms of LtC,κL,using a nonlinear regression method,reveals good fits to the tC data of the samples considered for tnd suggests a value of 0.2 for the Gruneisen *** is,however,found that for t>100 K the inclusion of the electronic component of tC,κe,incorporating contributions from relevant electron scattering mechanisms,is needed to obtain good agreement with the tC data over the wide temperature *** detailed investigations of tC of Cd_(3)As_(2)are required to better understand its suitability in thermoelectric and thermal management devices.

关键词： dirac semimetals Cd_(3)As_(2) thermal conductivity phonon scattering