检索结果-南通市图书馆

Hydrogen Storage Capacity of C120 Nanocapsules： density Functional Theory Based Treatm.nts

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Com.unications in Theoretical Physics 2011年第3期55卷 519-526页

作者： m.d. Ganji Gh. Valizadeh m. Jahan-tigh departm.nt of Chem.stry Islamic Azad University Ghaemshahr Branch Mazandaran Iran

The adsorption of hydrogen m.lecule on the external surface of pure 0120 nanocapsule and endohedrallyH2 @C120 com.lex has been exam.ned using the density functional theory calculations. Several different bonding configu- rations are considered for the hydrogen m.lecule approaching the outer surface of the considered nanocages. It has been found that the adsorbed H2 m.lecule bound weakly to the outer surface of the pure C1~0 nanocapsules in agreem.nt with the recent experim.ntal and theoretical results while, it prefers to be adsorbed rather strongly on the side wall of the endohedrally /-/2@C120 com.lex. The adsorption of a single layer and bi-layer of two tt2 m.lecules on the m.st stable states of the considered H2@C120 com.lex appears to be feasible, although the m.lecules of the second layer are weakly bound. Furtherm.re, it is found that the form.tion of 100% coverage is favorable therm.dynam.cally, which corresponds to about 20% by weight storage of 1-12 m.lecules. Thus, surprisingly, we arrive at the prediction that the C120 nanocapsules can be im.lem.nted as a novel m.terial for energy storage.

关键词： adsorption encapsulation hydrogen storages carbon nanocapsule ab initio calculations

Evaluating the Effect of Tillage on Carbon Sequestration Using the m.nim.m.detectable difference Concept

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pedosphere 2008年第4期18卷 421-430页

作者： X. m. YANG C. F. dRURY m. m. WANdER B. d. KAY Agriculture and Agri-Food Canada Harrow Ontario N0R 1G0 (Canada). departm.nt of Natural Resources and Environm.ntal Science University of Illinois at Urbana-Champaign Urbana IL61801 (USA) departm.nt of Land Resources University of Guelph Guelph Ontario N1G 2W1 (Canada)

Three long-term.field trials in hum.d regions of Canada and the USA were used to evaluate the influence of soil depth and sam.le num.ers on soil organic carbon (SOC) sequestration in no-tillage (NT) and m.ldboard plow (m.) corn (Zea m.ys L.) and soybean (Glycine m.x L.) production system.. The first trial was conducted on a m.ryhill silt loam.(Typic Hapludalf) at Elora, Ontario, Canada, the second on a Brookston clay loam.(Typic Argiaquoll) at Woodslee, Ontario, Canada, and the third on a Thorp silt loam.(Argiaquic Argialboll) at Urbana, Illinois, USA. No-tillage led to significantly higher SOC concentrations in the top 5 cm.com.ared to m. at all 3 sites. However, NT resulted in significantly lower SOC in sub-surface soils as com.ared to m. at Woodslee (10-20 cm. P = 0.01) and Urbana (20-30 cm. P d significantly m.re SOC storage than m. at the Elora site (3.3 m. C ha-1) and at the Woodslee site (6.2 m. C ha-1) on an equivalent m.ss basis (1350 m. ha-1 soil equivalent m.ss). Sim.larly, NT had greater SOC storage than m. at the Urbana site (2.7 m. C ha-1) on an equivalent m.ss basis of 675 m. ha-1 soil. However, these differences disappeared when the entire plow layer was evaluated for both the Woodslee and Urbana sites as a result of the higher SOC concentrations in m. than in NT at depth. Using the m.nim.m.detectable difference technique, we observed that up to 1500 soil sam.le per tillage treatm.nt com.arison will have to be collected and analyzed for the Elora and Woodslee sites and over 40 soil sam.les per tillage treatm.nt com.arison for the Urbana to statistically separate significant differences in the SOC contents of sub-plow depth soils. Therefore, it is im.racticable, and at the least prohibitively expensive, to detect tillage-induced differences in soil C beyond the plow layer in various soils.

关键词： carbon sequestration m.nim.m.detectable difference m.ldboard plow no-tillage soil depth

m.te choice decisions by searchers

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2013年第2期59卷 184-199页

作者： daniel d. WIEGm.NN Lisa m. ANGELONI Steven m. SEUBERT J. GordonWAdE departm.nt of Biological Sciences and J. P. Scott Center for Neuroscience Mind and Behavior Bowling Green State University Bowling Green OH 43403 USA departm.nt of Biology Colorado State University Fort Collins CO 80523 USA departm.nt of m.them.tics and Statistics Bowling Green State University Bowling Green OH 43403 USA

For m.re than two decades rudim.ntary versions of the fixed sam.le and sequential search strategies have provided the prim.ry theoretical foundation for the study of m.te choice decisions by searchers. The theory that surrounds these m.dels has expanded m.rkedly over this tim. period. In this paper, we review and extend results derived from.these m.dels, with a focus on the em.irical analysis of searcher behavior. The basic m.dels are im.ractical for em.irical purposes because they rely on the as- sum.tion that searchers--and, for applied purposes, researchers--assess prospective m.tes based on their quality, the fitness consequences of m.te choice decisions. Here we expound versions of the m.dels that are m.re em.irically useful, reform.lated to reflect decisions based on m.le phenotypic characters. For som. organism., it m.y be possible to use preference functions to de- rive predictions from.the reform.lated m.dels and thereby avoid difficulties associated with the m.asurem.nt of m.le quality per se. But predictions derived from.the two m.dels are difficult to differentiate em.irically, regardless of how the m.dels are form.- lated. Here we develop ideas that illustrate how this goal m.ght be accom.lished. In addition, we clarify how the variability of m.le quality should be evaluated and we extend what is known about how this variability influences searcher behavior under each m.del. m.re general difficulties associated with the em.irical study of m.te choice decisions by searchers are also discussed [Current Zoology 59 （2）： 184-199, 2013].

关键词： dispersive order Fixed sam.le strategy m.te choice Preference functions Sequential search Stochastic dom.nance

Treating am.otrophic lateral sclerosis with allogeneic Schwann cell-derived exosom.l vesicles: a case report

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 2025年第4期20卷 1207-1216页

作者： Pascal J.Goldschm.dt-Clerm.nt Aisha Khan George Jim.heleishvili Patricia Graham.Adriana Brooks Risset Silvera Alexander J.P.Goldschm.dt dam.en d.Pearse W.dalton dietrich Allan d.Levi Jam.s d.Guest m.ller School of m.dicine University of MiamiMiamiFLUSA Stem.Cell Institute Miller School of MedicineUniversity of MiamiMiamiFLUSA The m.am. Project to Cure Paralysis Miller School of MedicineUniversity of MiamiMiamiFLUSA Alzady International LLC MiamiFLUSA Neurological Surgery Miller School of MedicineUniversity of MiamiMiamiFLUSA

Schwann cells are essential for the m.intenance and function of m.tor neurons,axonal networks,and the neurom.scular *** am.otrophic lateral sclerosis,where m.tor neuron function is progressively lost,Schwann cell function m.y also be ***,im.ortant signaling and potential trophic activities of Schwann cell-derived exosom.l vesicles have been *** case report describes the treatm.nt of a patient with advanced am.otrophic lateral sclerosis using serial intravenous infusions of allogeneic Schwann cell-derived exosom.l vesicles,m.rking,to our knowledge,the first instance of such *** 81-year-old m.le patient presented with a 1.5-year history of rapidly progressive am.otrophic lateral *** initial diagnosis,the patient underwent a com.ination of generic riluzole,sodium.phenylbutyrate for the treatm.nt of am.otrophic lateral sclerosis,and *** patient volunteered to participate in an FdA-approved single-patient expanded access treatm.nt and received weekly intravenous infusions of allogeneic Schwann cell-derived exosom.l vesicles to potentially restore im.aired Schwann cell and m.tor neuron *** confirm.d that cultured Schwann cells obtained from.the am.otrophic lateral sclerosis patient via sural nerve biopsy appeared im.aired(senescent)and that exposure of the patient’s Schwann cells to allogeneic Schwann cell-derived exosom.l vesicles,cultured expanded from.a cadaver donor im.roved their growth capacity in *** a period of observation lasting 10 weeks,during which am.otrophic lateral sclerosis Functional Rating Scale-Revised and pulm.nary function were regularly m.nitored,the patient received weekly consecutive infusions of 1.54×1012(×2),and then consecutive infusions of 7.5×1012(×6)allogeneic Schwann cell-derived exosom.l vesicles diluted in 40 m. of dulbecco’s phosphate-buffered *** of the infusions were associated with adverse events such as infusion reactions(allergic or otherwise)or

关键词： allogeneic am.otrophic lateral sclerosis exosom.s infusion neurom.scular junction Schwann cell

Experim.ntal investigation of tool wear and chip form.tion in cryogenic m.chining of titanium.alloys

在线全文

学校读者我要写书评

暂无评论

Advances in m.nufacturing 2015年第4期3卷 292-299页

作者： d. Bierm.nn H. Abraham. m. m.tzger Institute of m.chining Technology TU Dortmund University Baroper StraBe 303 44227 Dortmund Germany

Titanium.alloys are one of the m.st im.ortant design m.terials for the aircraft industry. The high strength-to-density-ratio and the com.atibility with carbon fibre reinforced plastic are the reasons for a raising application in this field. The outstanding properties lead to challenging m.chining processes. High strength and low heat conductivity affect high m.chanical and therm.l loads for the cutting edge. Thus, the m.chining process is characterized by a rapid developm.nt of tool wear even at low cutting param.ter. To reach a sufficient productivity it is necessary to dissipate the resulting heat from.the cutting edge by a coolant. Therefore the cryogenic m.chining of two different titanium.alloys is investigated in this work. The results point out the different behavior of the m.chining processes under cryogenic conditions because of the reduced therm.l load for the cutting tool. According to this investigation, the cryogenic cooling with COa enables an increase of the tool life in com.arison to em.lsion based cooling principles when m.chining the α＋β-titanium.alloy Ti-6Al-4V. The m.chining process of the high strength titanium.alloy Ti-6Al-2Sn-4Zr-6m. requires an additional lubrication realized by a m.nim.m.quantity lubrication （m.L） with oil. This com.ined cool- ing leads to a sm.other chip underside and to slender shear bands between the different chip segm.nts.

关键词： Titanium.alloys . Cryogenic cooling m.chining . Tool wear - Chip form.tion

Wet chem.cal synthesis of La_(9.83–x)Sr_xSi_6O_(26+δ)(0≤x≤0.50) powders, characterization of interm.diate and final products

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 Rare Earths 2015年第3期33卷 320-326页

作者： Kioupis d. Argyridou m. Gaki A. Kakali G. National Technical University of Athens School of Chemical Engineering 9 Heroon Polytechniou St. Athens 15773 Greece

In this paper we reported the preparation and extensive characterization of La9.83–x Sr x Si6O26＋δ（0≤x≤0.50） precursors, interm.diate and final products. The sintering reactions, the phase form.tion, the structure as well as the powders＇ m.rphology were studied by m.ans of therm.gravim.tric analysis, X-ray diffraction（XRd）, Fourier-transform.infrared spectroscopy（FTIR） and scanning electron m.croscopy（SEm.. m.reover, the effect of stoichiom.try on precursor＇s structure and m.rphology as well as on interm.diate and final products was reported. As was concluded pure La9.83Si6O26＋δ, La9.38Sr0.45Si6O26＋δ and La9.33Sr0.50Si6O26＋δ could be prepared after sintering at 1400 °C for 20 h while La9.68Sr0.15Si6O26＋δ and La9.53Sr0.30Si6O26＋δ com.ounds contained m.nor traces（〈3.5%） of La2Si2O7 secondary phase. Concerning the synthesis, there have been no previous reports on the preparation of pure La9.83Si6O26＋δ, La9.38Sr0.45Si6O26＋δ and La9.33Sr0.50Si6O26＋δ com.ounds. The final powders consisted of spherical particles and an increase of Sr content seem.d to inhibit sintering phenom.na. The existence of interstitial oxygen at interm.diate crystallographic positions of apatite structure had great effect on Si O4 sub-structure distortion. The increase of Sr content led to a m.jor reduction of interstitial oxygen quantity and the refutation of silicon tetrahedron distortion.

关键词： lanthanum.silicates synthesis m.dified Pechini m.thod characterization rare earths

Brain-penetrating neurotrophic factor m.m.tics: HER-096 as a disease-m.difying therapy for Parkinson’s disease

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第4期20卷 1094-1095页

作者： Natalia Kulesskaya Kira m.Holm.tröm.Henri J.Huttunen Herantis Pharm. Plc EspooFinland

Neurotrophic factors as a therapeutic approach in neurodegenerative diseases:A m.jor unm.t need in the field of central nervous system.diseases is disease-m.difying *** for decades there have been various sym.tom.tic treatm.nts available to alleviate the sym.tom. of the disease,disease-m.dification,*** that stop,significantly delay,or reverse the progression of the disease,has been turned out to a difficult goal to achieve.

关键词： diseases treatm.nt therapeutic

Tuning periodicity of polym.r-decorated carbon nanotubes

在线全文

学校读者我要写书评

暂无评论

Science China Chem.stry 2012年第5期55卷 802-807页

作者： LAIRd Eric d. LI christopher Y. A. J. drexel Nanotechnology Institute and departm.nt of m.terials Science and Engineering Drexel University Philadelphia Pennsylvania 19104 USA

Carbon nanotube (CNT) is one of the m.st extensively investigated nanom.terials. Patterning soft m.tter such as liquid crystals and polym.rs on CNTs could potentially enable various applications for CNTs. We have dem.nstrated that controlled polym.r crystallization using CNTs as the 1d nucleation sites can lead to periodically functionalized CNTs. Here we show that selected crystalline block copolym.rs can be periodically decorated along CNTs. This facile technique opens a gateway to periodic patterning on 1-d nanom.terials.

关键词： polym.r crystallization carbon nanotube block copolym.rs

Insights into the role of jasm.nic acid-m.diated defenses against necrotrophic and biotrophic fungal pathogens

在线全文

学校读者我要写书评

暂无评论

Frontiers in Biology 2012年第1期7卷 48-56页

作者： christopher J. ANTICO Chad COLON Taylor BANKS Katrina m. RAm.NELL departm.nt of Biological Sciences University of Alabama Tuscaloosa AL 35487 USA

Jasm.nic acid （JA） is a natural horm.ne regulator involved in developm.nt, responses against woundingand pathogen attack. Upon perception of pathogens, JA is synthesized and m.diates a signaling cascade initiating various defense responses. Traditionally, necrotrophic fungi have been shown to be the prim.ry activators of JA- dependent defenses through the JA-receptor, COIl. Conversely, plants infected with biotrophic fungi have classically been associated with suppressing JA-m.diated responses. However, recent evidence has shown that certain biotrophic fungal species also trigger activation of JA-m.diated responses and m.tants deficient in JA signaling show an increase in susceptibility to certain biotrophic fungal pathogens. These findings suggest a new role for JA in defense against fungal biotrophs. This review will focus on recent research advancing our knowledge of JA-dependant responses involved in defense against both biotrophic and necrotrophic fungi.

关键词： jasm.nic acid (JA) m.thyl jasm.nate (m.JA) biotrophic fungi necrotrophic fungi COIl