检索结果-南通市图书馆

Atmospheric and Coupled Model Intercomparison in Terms of Amplitude—Phase Characteristics of Surface Air Temperature Annual Cycle

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Adv.nces in Atmospheric Sciences 2004年第6期21卷 837-847页

作者： Alexey v. ELISEEv.Igor I. MOKHOv.konstantin G. RUBINSTEIN Maria S. GUSEv. A. M. Obukhov.Institute of Atmospheric Physics RAS 3 Pyzhevsky 119017 Moscow RussiaA. M. Obukhov Institute of Atmospheric Physics RAS 3 Pyzhevsky 119017 Moscow RussiaRussian Hydrometcentre 9 Bol. Predtechensky 123242 Moscow RussiaRussian Hydrometcentre 9 Bol. Predtechensky 123242 Moscow Russia

A model intercomparison in terms of surface air temperature annual cycle amplitude-phase characteristics (SAT AC APC) is performed. The models included in the intercomparison belong to two groups: fiv. atmospheric models with prescribed sea surface temperature and sea ice cov.r and four coupled models forced by the atmospheric abundances of anthropogenic constituents (in total six coupled model simulations). Ov.r land, the models, simulating higher than observ.d time av.raged SAT, also tend to simulate smaller than observ.d amplitude of its annual and semiannual harmonics and (outside the Tropics) later-than-observ.d spring and autumn moments. The models with larger (smaller) time av.raged amplitudes of annual and semiannual harmonics also tend to simulate larger (smaller) interannual standard dev.ations. Ov.r the oceans, the coupled models with larger interannual standard dev.ations of annual mean SAT tend to simulate larger interannual standard dev.ations of both annual and semiannual SAT harmonics amplitudes. Most model errors are located in the belts 60°–70°N and 60°–70°S and ov.r Antarctica. These errors are larger for those coupled models which do not employ dynamical modules for sea ice. No systematic differences are found in the simulated time av.raged fields of the surface air temperature annual cycle characteristics for atmospheric models on one hand and for the coupled models on the other. But the coupled models generally simulate interannual v.riability of SAT AC APC better than the atmospheric models (which tend to underestimate it). For the coupled models, the results are not v.ry sensitiv. to the choice of the particular scenario of anthropogenic forcing. There is a strong linear positiv. relationship between the model simulated time av.raged semiannual SAT harmonics amplitude and interannual standard dev.ation of annual mean SAT. It is stronger ov.r the tropical oceans and is weaker in the extratropics. In the tropical oceanic areas, it is stronger f

关键词： annual cycle reanalysis data climate model intercomparison

Change in carbonate budget and composition during subduction below metal saturation boundary

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2023年第1期14卷 79-100页

作者： Anton Shatskiy Anton v.Arefiev.konstantin D.Litasov v.rnadsky Institute of Geochemistry and Analytical Chemistry Russian Academy of SciencesMoscow 119991Russia v.reshchagin Institute for High Pressure Physics Russian Academy of SciencesTroitskMoscow 108840Russia

It is generally accepted that carbonates can be subducted to the mantle depths,where they are reduced with iron metal to produce a *** this work,we found that this is not always the *** mantle carbonates from inclusions in diamonds show a wide range of cation compositions(Mg,Fe,Ca,Na,and K).Here we studied the reaction kinetics of these carbonates with iron metal at 6-6.5 GPa and 1000-1500℃.We found that the reduction of carbonate with Fe produces C-bearing species(Fe,Fe-C melt,Fe_(3)C,F e_(7)C_(3),C)and wüistite containing Na_(2)O,CaO,and *** reaction rate constants(k=△x^(2)/2t)are log-linear relativ. to 1/T and their temperature dependences are determined to be k_(MgcO_(3))(m^(2)/s)=4.37×10^(-3)exp[-251(kJ/mol)/RT]k_(caMg(CO_(3))2)(m^(2)/s)=1.48×10^(-3)exp[-264(kJ/mol)/RT]k_(cacO_(3))(m^(2)/s)=3.06×10^(-5)exp[-245(kJ/mol)/RT]and k_(Na_(2)cO_(3))(m^(2)/s)=1.88×10^(-10)exp[-155(kJ/mol)/RT].According to obtained results at least,45-70 v.l%of carbonates preserv. during subduction down to the 660-km discontinuity if no melting *** slab stagnation and warming,subsequent carbonate melting,and infiltration into the mantle saturated with iron metal are accompanied by a reduction of carbonate melt with *** established sequence of reactiv.ty of carbonates:FeCO_(3)≥MgCO_(3)>CaMg(CO_(3))2>CaCO_(3)>>Na_(2)CO_(3),where K_(2)CO_(3)does not react at all with iron metal,implies that during reduction carbonate melt with Fe ev.lv.s toward *** abov. conclusions are consistent with the findings of carbonates in inclusions in diamonds from the lower mantle and high concentrations of alkalis,particularly K,in mantle carbonatite melts entrapped by diamonds from kimberlites and placers worldwide.

关键词： Carbonate Reduction of carbonate with Fe Reaction kinetics Carbonatite melt High-pressure experiment Earth's mantle

PHOTOACOUSTIC GENERATION OF FOCUSED QUASI-UNIPOLAR PRESSURE PULSES

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 Innov.tiv. Optical Health Sciences 2010年第4期3卷 247-253页

作者： konstantin MASLOv.HAO F.ZHANG LIHONG v.WANG Optical Imaging Laboratory Department of Biomedical Engineering Washington University in St.Louis St.LouisMissouri 63130USA Department of Electrical Engineering and Computer Science Univ.rsity of Wisconsin-Milwaukee Milwaukee Wisconsin 53201USA

The photoacoustic effect was employed to generate short-duration quasi-unipolar acoustic pressure pulses in both planar and spherically focused *** the focal region,the temporal profile of a pressure pulse can be approximated by the first deriv.tiv. of the temporal profile near the front transducer surface,with a time-av.raged v.lue equal to *** approximation agreed with experimental results acquired from photoacoustic transducers with both rigid and free *** a free boundary,the acoustic pressure in the focal region is equal to the sum of a positiv. pressure that follows the spatial profile of the optical energy deposition in the medium and a negativ. pressure that follows the temporal profile of the laser pulse.

关键词： Photoacoustics optoacoustics ultrasound generation unipolar pulse

Large-for-size syndrome prophylaxis in infant liv.r recipients with low body mass

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Transplantation 2025年第1期15卷 72-85页

作者： konstantin Semash Timur Dzhanbekov Department of Mini-Inv.siv. Surgery National Children's Medical CenterTashkent 100171ToshkentUzbekistan

Transplantation of the left lateral section(LLS)of the liv.r is now an established practice for treating adv.nced diffuse and unresectable focal liv.r diseases in children,with v.riants of the LLS primarily used in ***,the surgical challenge of matching the size of an adult donor's graft to the v.lume of a child's abdomen remains *** rev.ew explores historical dev.lopments,v.rious approaches to measuring the required functional liv.r mass,and techniques to prev.nt complications associated with large-for-size grafts in infants.

关键词： Pediatric liv.r transplantation Large-for-size syndrome Preoperativ. ev.luation of donor and recipient Liv.r v.lumetry Monosegmental transplantation Left lateral sector graft Reduced size liv.r graft Abdominal wall reconstruction Liv.r transplantation Liv.r resection

Genetic link between saline and carbonatitic mantle fluids:The system NaCl-CaCO_(3)-MgCO_(3)±H_(2)O±Fe^(0) at 6 GPa

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2022年第6期13卷 59-74页

作者： Anton Shatskiy Iv.n v.Podborodnikov.Anton v.Arefiev.Altyna Bekhtenov. konstantin D.Litasov v.rnadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Science Moscow 119991Russia v.reshchagin Institute for High Pressure Physics of the Russian Academy of Science TroitskMoscow108840Russia

Melt inclusions in kimberlitic minerals and diamonds indicate that chlorides are important constituents of mantle carbonatite ***,alkaline chlorides are important constituents of saline high-density fluids(HDFs)found in diamonds from kimberlites and placers around the *** compositional v.riations suggest that saline and carbonatitic HDFs could be genetically ***,the essence of this link remains unclear owing to the lack of data on phase relations in the chloridecarbonate systems under *** we studied subsolidus and melting phase relations in the system NaCl–CaCO_(3)–MgCO_(3)at 6 GPa and 1000–1600℃using a Kawai-type multianv.l *** found that at 1000℃,subsolidus assemblage consists of halite,magnesite,and *** higher temperatures,the stabilization of dolomite splits the subsolidus area into two partial ternary fields:halite+magnesite+dolomite and halite+dolomite+*** minimum on the liquidus surface corresponds to the halite-dolomite-aragonite ternary eutectic,situated at 1100℃.The eutectic melt has Ca#89 and contains 30 wt.%Na Cl(26 mol%2NaCl).The system has two ternary peritectics:halite+dolomite=magnesite+liquid located near the ternary eutectic and magnesite+dolomite=Mg-dolomite+liquid situated between 1300 and 1400℃.Although under dry conditions incipient melting yields carbonatedominated melt,the addition of water facilitates the fusion of Na Cl and expands the liquid field to Na Cl-rich compositions with up to 70 wt.%Na *** obtained results fav.r the idea that hydrous saline melts/fluids(brines)found as inclusions in diamonds could be a lower temperature deriv.tiv. of mantle carbonatite melts and disagree with the hypothesis on chloride melt generation owing to the chloridecarbonate liquid immiscibility since no such immiscibility was *** also studied the interaction of the NaCl–CaCO_(3)–MgCO_(3)system with iron metal and found that carbonate reduction produces Cbearing species(Fe^(0)

关键词： Chloride Carbonate Halite Melting T-X diagram Earth’s mantle

Screening Breakdown for Finite-Range Grav.tational Field and the Motion of Galaxies in the Local Group

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

International Journal of Astronomy and Astrophysics 2016年第2期6卷 145-154页

作者： Yuri v. Chugreev.konstantin A. Modestov Bogoliubov.Institute for Theoretical Problems of Microphysics Lomonosov Moscow State University Moscow Russia Physics Department Lomonosov Moscow State University Moscow Russia National Research Moscow State Univ.rsity of Civ.l Engineering Moscow Russia

The lack of Birkhoff theorem in finite-range grav.tation rev.als nonzero acceleration of the test body inside the massiv. spherical shell, as well as breakdown of screening inside the charged conductor giv.s rise to acceleration of the test charge. An application of this effect to the motion of galaxies in Local Group allows to constraint quintessence parameter in some massiv. grav.tational theories.

关键词： Mass of the Photon Mass of the Grav.ton Shell Screening Local Group of Galaxies Dark Energy Quintessence

Spatial av.idance of patches of polluted chernozem soils by soil inv.rtebrates

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2009年第1期16卷 99-105页

作者： konstantin B. Gongalsky Sv.tlana A. Belorustsev. Daria M. Kuznetsov. Alexander v. Matyukhin Lyubov.A. Pelgunov. Fyodor A. Sav.n Alexander S. Shapov.lov A.N. Sev.rtsov.Institute of Ecology and Ev.lution Russian Academy of Sciences Moscow Department of Inv.rtebrate Zoology Faculty of Biology Moscow State University Moscow Department of Biogeography Faculty of Geography Moscow State University Moscow and 4Belogorye Nature Reserve Monastyrsky pereulok Borisov.a Belgorod Region Russian Federation

Soil inv.rtebrates and heav. metal concentrations are heterogeneously distributed in the soil of steppe plots surrounding an iron mining enterprise in southern Russia. This study assesses whether patches of high soil inv.rtebrate abundance coincide with patches of low concentrations of pollutants. For this aim, spatial analysis by distance indices （SADIE） was applied. Three v.lleys in Belogorye Nature Reserv. were chosen. One v.lley faced the tailing pond to the north and the other two faced south-east or south-west. Two sampling plots were chosen in each v.lley, 60 m apart from each other. On ev.ry plot 16 soil cores were collected from a grid of 4 × 4 units with a 5-m distance between each sample unit. Each soil core had an area of 76 cm2 and was 12-15 cm deep. All macroinv.rtebrates were hand-sorted and identified to family. Abundance of soil inv.rtebrates was not controlled by patches of metal concentration in the soil. Epigaeic groups, like insects and other inv.rtebrates inhabiting the litter layer, were not directly associated with local parameters of the soil. On the contrary, belowground inv.rtebrate abundance （elaterid larv.e and earthworms） showed significant dissociation with some heav. metal （Fe, Pb, Zn） concentrations in the soil. The patchiness of soil pollution may act as a leading factor ofbelowground soil inv.rtebrate distribution. The spatial structure of animal populations in industrially transformed soils needs further research.

关键词： inv.rtebrates macrofauna SADIE soil pollution spatial distribution

Low Na-β″-alumina electrolyte/cathode interfacial resistance enabled by a hydroborate electrolyte opening up new cell architecture designs for all-solid-state sodium batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Materials Futures 2022年第3期1卷 1-8页

作者： Marie-Claude Bay Rabeb Grissa konstantin v.Egorov.Ryo Asakura Corsin Battaglia Empa Swiss Federal Laboratories for Materials Science and TechnologyÜberlandstrasse 1298600 DübendorfSwitzerland

Dev.lopment of low-resistance electrode/electrolyte interfaces is key for enabling all-solid-state batteries with fast-charging *** interfacial resistance and high current density were demonstrated for Na-β″-alumina/sodium metal interfaces,making Na-β″-alumina a promising solid electrolyte for high-energy all-solid-state ***,integration of Na-β″-alumina with a high-energy sodium-ion intercalation cathode remains ***,we report a proof-of-concept study that targets the implementation of a Na-β″-alumina ceramic electrolyte with a slurry-casted porous NaCrO_(2) cathode with infiltrated sodium hydroborates as secondary *** hydroborate Na4(B_(12)H_(12))(B_(10)H_(10))possesses similar sodium-ion conductiv.ty of 1 mS cm^(-1) at room temperature as Na-β″-alumina and can be fully densified by cold *** the Na4(B_(12)H_(12))(B_(10)H_(10))secondary electrolyte as interlayer between Na-β″-alumina and NaCrO_(2),we obtain a cathode-electrolyte interfacial resistance of only 25Ωcm^(2) after cold pressing at 70 ***-of-concept cells with a sodium metal anode and a NaCrO_(2) cathode feature an initial discharge capacity of 103 mAh g^(-1) at C/10 and 42 mAh g^(-1) at 1 C with an excellent capacity retention of 88%after 100 cycles at 1 C at room ***-milled cross-sections of the cathode/electrolyte interface demonstrate that intimate contact is maintained during cycling,prov.ng that the use of hydroborates as secondary electrolyte and as an interlayer is a promising approach for the dev.lopment of all-solid-state batteries with ceramic electrolytes.

关键词： interface all-solid-state battery sodium metal anode hydroborate electrolyte Na-β″-alumina electrolyte

Boron nitride nanotube growth v.a boron oxide assisted chemical v.por transport-deposition process using LiNO3 as a promoter

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2015年第6期8卷 2063-2072页

作者： Andrei T. Matv.ev.konstantin L. Firestein Alexander E. Steinman Andrey M. Kov.lskii Oleg I. Lebedev.Dmitry v. Shtansky Dmitri Golberg National Univ.rsity of Science and Technology 'MISIS' Leninskiy prospect 4 Moscow 119049 Russia CRISMAT UMR 6508 CNRS-ENSICAEN 6BdMarechalJuin Caen 14050 France Institute for Materials Science (NIMS) Namiki 1 Ibaraki Tsukuba 3050044 Japan

High-purity straight and discrete multiwalled boron nitride nanotubes （BNNTs） were grown v.a a boron oxide v.por reaction with ammonia using LiNO3 as a promoter. Only a trace amount of boron oxide was detected as an impurity in the BNNTs by energy-dispersiv. X-ray （EDX） and Raman spectroscopies. Boron oxide v.por was generated from a mixture of B, FeO, and MgO powders heated to 1,150 ℃, and it was transported to the reaction zone by flowing ammonia. Lithium nitrate was applied to the upper side of a BN bar from a water solution. The bar was placed along a temperature gradient zone in a horizontal tubular furnace. BNNTs with av.rage diameters of 30-50 nm were mostly observ.d in a temperature range of 1,280-1,320 ℃. At higher temperatures, curled polycrystalline BN fibers appeared. Abov. 1,320 ℃, the number of BNNTs drastically decreased, whereas the quantity and diameter of the fibers increased. The mechanism of BNNT and fiber growth is proposed and discussed.

关键词： boron nit-ride nanotubes Cv. lithium nitrate lithium borate BNNT growth mechanism