检索结果-南通市图书馆

Trends in yeast diversity discovery

在线全文

学校读者我要写书评

暂无评论

Fungal Diversity 2022年第3期114卷 491-537页

作者： Teun Boekhout Anthony S.Amend Fouad El Baidouri Toni Gabaldón józsef Geml Moritz Mittelbach Vincent robert Chen Shuhui Tan Benedetta Turchetti Duong Vu Qi-Ming Wang Andrey Yurkov Westerdijk Institute of Fungal Biodiversity Uppsalalaan 83584CT UtrechtThe Netherlands Institute of Biodiversity and Ecosystems Dynamics(IBED) University of AmsterdamSciencepark 9041098 XH AmsterdamThe Netherlands School of Life Sciences University of Hawaii at Manoa2538 McCarthy MallEdmonson 216HonoluluHI 96822USA Barcelona Supercomputing Centre(BSC-CNS) Jordi Girona2908034 BarcelonaSpain Institute for research in Biomedicine(IrB Barcelona) The Barcelona Institute of Science and TechnologyBaldiri Reixac1008028 BarcelonaSpain Catalan Institution for research and Advanced Studies(ICrEA) BarcelonaSpain MTA-EKE Lendület Environmental Microbiome research Group Eszterházy Károly UniversityLeányka u.6.3300 EgerHungary Senate Department for the Environment Transport and Climate ProtectionBerlinGermany The Yeasts Foundation UtrechtThe Netherlands Department of Agriculture Food and Environmental SciencesUniversity of PerugiaPerugiaItaly Industrial Yeasts Collection DBVPG University of PerugiaPerugiaItaly College of Life Sciences Institute of Life Sciences and Green DevelopmentHebei UniversityBaoding 071002HebeiChina Leibniz Institute DSMZ-German Collection of Microorganisms and Cell Cultures BrunswickGermany

Yeasts,usually defined as unicellular fungi,occur in various fungal ***,they are not a taxonomic unit,but rather represent a fungal lifestyle shared by several unrelated *** the discovery of new yeast species occurs at an increasing speed,at the current rate it will likely take hundreds of years,if ever,before they will all be *** parts of the earth,including many threatened habitats,remain unsampled for yeasts and many others are only superficially *** habitats,such as glaciers,are home to a specific community of cold-adapted yeasts,and,hence,there is some urgency to study such environments at locations where they might disappear soon due to anthropogenic climate *** same is true for yeast communities in various natural forests that are impacted by deforestation and forest *** countries of the so-called Global South have not been sampled for yeasts,despite their economic ***,extensive research activity in Asia,especially China,has yielded many taxonomic *** genomics stud-ies have demonstrated the presence of yeast species with a hybrid origin,many of them isolated from clinical or industrial ***-metabarcoding studies have demonstrated the prevalence,and in some cases dominance,of yeast species in soils and marine waters worldwide,including some surprising distributions,such as the unexpected and likely common presence of Malassezia yeasts in marine habitats.

关键词： Yeasts Ascomycota Basidiomycota Diversity CBD Nagoya protocol Soil DNA-metabarcoding Marine Malassezia Cold environments China

Considerations for effective ground support in evaporites

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International journal of Mining Science and Technology 2019年第1期29卷 113-118页

作者： j.r.Nopola C.A.Vining rESPEC

Evaporites, such as salt and potash, pose unique problems to ground-support designs that are not encountered in other rock types. Evaporites are subject to continual creep and no amount of ground support can successfully arrest this process. Common ground-support techniques that are useful for most rock types may reduce the effective life of bolts in evaporite mines and create unseen hazards. A different approach to ground support must be applied to provide long-term support in areas where high creep rates are present. The goal of effective ground-support designs in these situations is not to contain and prevent the rock from moving; rather, the ground-support design must be able to move along with the rock and contain any fully detached slabs until additional remediation measures can be *** most appropriate ground-support designs will consider the expected movement of the rock and the duration that the area needs to remain accessible.

关键词： Ground support Ground control rock mechanics And salt mechanics

SECOND-OrDEr INTErACTION OF IrrEGULAr WAVES WITH A TrUNCATED COLUMN

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 1997年第2期13卷 130-142页

作者： j.B.Huang r.EatockTaylor Department of Engineering Science University of OxfordParks RoadOxfordOX1 3PJUK

A complete semi-analytical solution is obtained for second-order diffraction of plane bichromatic waves by a fixed truncated circular *** fluid domain is divided into interior and exterior *** the exterior region,the second-order velocity potential is expressed in terms of‘locked-wave’and‘free-wave’ components,both are solved using Fourier and eigenfunction *** re- sulting‘locked wave’potential is expressed by one-dimensional Green's integrals with oscillating *** order to increase computational efficiency,the far-field part of the integrals are carried out *** in both regions are matched on the interface by the potential and its normal derivative continuity *** on the present approach,the sum-and difference-frequency potentials are efficiently evaluated and are used to generate the quadratic transfer functions which correlates the incident wave spectrum with second-order forcing spectrum on the *** sum-frequency QTFs for a TLP column are present,which are compared for some frequency pairs with those from a fully numerical *** agreement has been *** spectra for a case study TLP column,generated using the semi-analytical solution are *** given are the results for nonlinear wave field around the column.

关键词： marine hydrodynamics nonlinear wave force wave-structure interaction second-order wave diffraction

Strain gradient plasticity: energetic or dissipative?

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2015年第4期31卷 465-472页

作者： N.A.Fleck j.r.Willis Department of Engineering University of Cambridge Department of Applied Mathematics and Theoretical Physics University of Cambridge

Abstract For an infinite slab of strain gradient sensitive material subjected to plane-strain tensile loading, compu- tation established and analysis confirmed that passivation of the lateral boundaries at some stage of loading inhibits plastic deformation upon further loading. This result is not surprising in itself except that, remarkably, if the gradient terms contribute to the dissipation, the plastic deformation is switched off completely and only resumes at a clearly defined higher load, corresponding to a total strain ec, say. The analysis presented in this paper confirms the delay of plastic deformation following passivation and determines the exact manner in which the plastic flow resumes. The plastic strain rate is continuous at the exact point ec of resumption of plastic flow and, for the first small increment Ae = e - ec in the imposed total strain, the corresponding increment in plastic strain, AeP, is proportional to （Ae）2. The constant A in the relation AeP（0） = A（Ae）2, where AeP（0） denotes the plastic strain increment at the centre of the slab, has been determined explicitly; it depends on the hardening modulus of the material. The presence of energetic gradient terms has no effect on the value of ec unless the dissipative terms are absent, in which case passivation reduces the rate of plastic deformation but introduces no delay. This qualitative effect of dissipative gradient terms opens the possibility of experimen- tal discrimination of their presence or absence. The analysisemploys an incremental variational formulation that is likely to find use in other problems.

关键词： Strain gradient plasticity Boundary passivation Incremental variational principle

Performance investigation of artificial intelligence based controller for three phase four leg shunt active filter

在线全文

学校读者我要写书评

暂无评论

Frontiers in Energy 2015年第4期9卷 446-460页

作者： j. jAYACHANDrAN r. MUrALI SACHITHANANDAM Department of Electrical and Electronics Engineering SASTRA University Thanjavur 613401 India

In this paper, the choice of power quality compensator is a DSTATCOM which constitutes a three phase four leg voltage source converter （VSC） with a DC capacitor. The control strategy proposed for the DSTAT- COM is a neural network based one cycle control （OCC）. This control strategy involves neural network block, digital circuits and linear elements, which eliminates the sensors required for sensing the load current and coupling inductor current in addition to the multiplier employed in the conventional method. The calculation of harmonic and reactive currents for the reference current generation is also eliminated, thus minimizing the complexity in the control strategy. The control strategy mitigates harmonic/reactive currents, ensures balanced and sinusoidal source current from the supply mains that are nearly in phase with the supply voltage, compensates neutral current, and maintains voltage across the capacitor under unbalanced source and load conditions. The performance of the DSTATCOM with the proposed artificial neural network （ANN） controllers is validated and investigated through simulations using Matlab software. The simulation results prove the efficacy of the proposed neural network based control strategy under varying source and load conditions.

关键词： neural network DSTATCOM neutral currentmitigation total harmonic distortion (THD) three phasefour wire distribution system unbalanced and/or distortedsource

THE DErIVATIVE PATCH INTErPOLATING rECOVErY TECHNIQUE FOr FINITE ELEMENT APPrOXIMATIONS

在线全文

学校读者我要写书评

暂无评论

journal of Computational Mathematics 2004年第1期22卷 113-122页

作者： TieZhang Yan-pingLin r.j.Tait DepartmentofMathematics NortheasternUniversityShenyang110006China DepartmentofMathematics UniversityofAlbertaAlbertaCanadaT6G2G1

A derivative patch interpolating recovery technique is analyzed for the finite element approximation to the second order elliptic boundary value problems in two dimensional *** is shown that the convergence rate of the recovered gradient admits superc onvergence on the recovered subdomain, and is two order higher than the optimal global convergence rate (ultracovergence) at an internal node point when even order finite element spaces and local uniform meshes are used.

关键词： Finite element Derivative recovery Ultraconvergence

Corrosion Behavior and Hardness of Al-M (M:Mo,Si,Ti,Cr) Alloys

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2017年第4期30卷 333-341页

作者： j.Esquivel r.K.Gupta Department of Chemical and Biomolecular Engineering The University of Akron Akron OH 44325-3906 USA

The corrosion behavior of Al-5 at.% Cr, A1-5 at.% Si, Al-5 at.% Mo and Al-5 at.% Ti produced via casting and Al-5 at.% Cr produced by high-energy ball milling and subsequent consolidation by cold pressing was studied using potentiodynamic polarization and surface analysis following constant immersion tests. Alloys were characterized using a scanning electron microscope coupled with the energy-dispersive X-ray spectroscopy and X-ray diffraction analysis. Hardness, a representative of the strength, was also measured. The alloys produced by casting contained coarse intermetallics and therefore exhibited poor corrosion resistance. Al-5 at.% Cr alloy produced by high-energy ball milling exhibited a significantly improved corrosion resistance and hardness, which was attributed to the grain refinement to nanoscale and extended solid solubility of Cr in AL The study indicated that the high-energy ball milling was capable of producing Al alloys with improved corrosion behavior and hardness.

关键词： Corrosion Mechanical alloying Casting Aluminum alloys

Polymer Sensitized Quasi Solid-State Photovoltaic Cells Using Derivatives of Polythiophene

在线全文

学校读者我要写书评

暂无评论

journal of Materials Science & Technology 2006年第6期22卷 811-816页

作者： G.K.r.Senadeera j.M.r.C.Fernando Institute of Fundamental Studies Hantane RoadKandySri Lanka Institute of Fundamental Studies Hantane RoadKandySri Lanka Postgraduate Institute of ScienceUniversity of PeradeniyaPeradeniyaSri Lanka

Substituted thiophene sensitized, nanocrystalline TiO2-based quasi solid-state solar cells were fabricated by using either poly （3-thiophene acetic acid）（P3TAA） or a copolymer with poly （3-thiophene acetic acid）-poly （hexyl thiophene）（P3TAA-PHT） polymers and copper iodide （Cul） as a hole conducting material together with an ionic liquid 1-ethyl-3-methylimidazolium bis （trifluoromethylsulfonyl） amide and lithium bis （triflu- oromethanesulfone） imide as additives for charge transport promotion. Dramatic enhancements in the cell performances were observed with the additives in Cul. While the cell sensitized with P3TAA generated a short-circuit photocurrent of -1.45 ***^-2, an open-circuit photovoltage of -345 mV with a total power conversion efficiency of -0.3% under simulated full sunlight of 100 mW-cm^-2 （air mass： 1.5）, the cell sensitized with copolymer P3TAA-PHT delivered -0.25% efficiency under the same conditions with -1.23 mA-cm^-2 as photocurrent and -371 mV as photovoltage.

关键词： Solar cells Polymers Titanium dioxide

Two examples of surfaces with normal crossing singularities

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2011年第8期54卷 1707-1712页

作者： KOLLr jános Department of Mathematics Princeton University

This note gives two examples of surfaces with normal crossing *** the first example the canonical ring is not finitely *** the second,the canonical line bundle is not ample but its pull back to the normalization is *** latter answers in the negative a problem left unresolved in Ⅲ.2.6.2 of lments de gometrie algbrique,1961,and raised again by Viehweg.

关键词： singular surface canonical ring ampleness criteria