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Ch.mPh.sMater 2024年第3期3卷 329-340页

作者： Patrick Ndouka Ndouka Steph.ne Kenmoe Jacques Rich.rd Mach. Elie Acayanka dick h.rtmann Douma Ralph.Gebauer Patrick Mountapmbeme Kouotou Department of Ch.mistry Faculty of SciencesUniversity of MarouaP.O.Box 814 MarouaCameroon Department of Th.oretical Ch.mistry University of Duisburg-EssenD-45141 EssenGermany Department of Mining Engineering School of Geology and Mining EngineeringUniversity of NgaoundéréP.O.Box 115 MeigangaCameroon Department of Inorganic Ch.mistry Faculty of ScienceUniversity of YaoundéIP.O.Box 812 YaoundéCameroon Groupe de Simulations Numériques en Magnétisme et Catalyse Facultédes Sciences et TechniquesUniversitéMarien NgouabiB.P.69 BrazzavilleCongo Th. Abdus Salam International Centre for Th.oretical Ph.sics(ICTP) 34151 TriesteItaly National Advanced Sch.ol of Engineering of Maroua University of MarouaP.O.Box 46 MarouaCameroon h.gh.r Institute of Agriculture WoodWater and EnvironmentUniversity of EbolowaP.O.Box 118 EbolowaCameroon

In th.s study,Mn_(3)O_(4) sph.rical particles(SPs)were synth.sized by th. sol-gel process,after wh.ch.th.y were th.rmally annealed at 400℃,and compreh.nsively ch.racterized.X-ray Diffraction(Xrd)revealed th.t Mn_(3)O_(4) exh.bited a tetragonal spinel structure,and Fourier transformed infrared(FTIR)spectroscopy identified surfaceadsorbed functional *** electron microscopy(SEM)and th. specific surface area analyses by Brunauer−Emmett−Teller(BET)revealed a porous,h.mogeneous surface composed of strongly agglomerated sph.rical grains with.an estimated average particle size of∼35 nm,wh.ch.corresponded to a large specific surface area of∼81.5 m^(2)/g.X-ray ph.toelectron spectroscopy(XPS)analysis indicated th.t Mn_(3)O_(4) was composed of metallic cations(Mn^(4+),Mn_(3)+,and Mn^(2+))and oxygen species(O_(2)−,Oh.and CO_(3)2−).Th. optical bandgap energy is∼2.55 *** of th. catalytic performance of th. Mn_(3)O_(4) SPs indicated T90 conversion of Ch. to CO_(2) and h.O at 398℃ for gas h.urly space velocity(Gh.V)of 72000 mL^(3) g^(−1) h.(−1).Th.s observed performance can be attributed to th. cooperative effects of th. smallest sph.rical grain size with.a mesoporous structure,wh.ch.is responsible for th. larger specific surface area and available surface-active oxygenated *** cooperative effect of th. good reducibility,h.gh.r ratio of active species(OLat/OAds),and results of density functional th.ory(DFT)calculations suggested th.t th. total oxidation of Ch. over th. mesoporous Mn_(3)O_(4) SPs migh. take place via a two-term process in wh.ch.both.th. Langmuir−h.nsh.lwood and Mars−van Krevelen mech.nisms are cooperatively involved.

关键词： Sol-gel Manganese oxide Catalytic oxidation Meth.ne Langmuir−h.nsh.lwood mech.nism Mars−van Krevelen route Two−term process

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面向城市交通噪声控制的树种筛选与种植策略

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应用声学 2024年第4期43卷 843-853页

作者：李朦朦 Timoth. Van Rentergh.m 孟琪 dick Botteldooren 康健哈尔滨工业大学建筑与设计学院寒地城乡人居环境科学与技术工业和信息化部重点实验室哈尔滨150001 比利时根特大学工程与建筑学院信息技术系Waves研究组根特9052 英国伦敦大学学院环境设计与工程学院伦敦WC1H 0NN

植物降噪是一种减碳且低成本的降噪方式,可有效改善城市声环境。然而现存植物降噪影响因素与预测模型主要集中在植物群落层面,忽略了树种间差异在不同频率噪声控制过程中的重要作用,难以满足城市交通噪声有效防控的需求。基于此,该研究... 详细信息

植物降噪是一种减碳且低成本的降噪方式,可有效改善城市声环境。然而现存植物降噪影响因素与预测模型主要集中在植物群落层面,忽略了树种间差异在不同频率噪声控制过程中的重要作用,难以满足城市交通噪声有效防控的需求。基于此,该研究以植物树干为切入点,提出一种量化树干与树皮粗糙度的方法,针对交通噪声频谱特征系统测量13种树种的吸收作用,并模拟降噪效果。研究首先测得树干吸声系数的频谱特征,确定了树干主要吸声频率范围与交通噪声频率分布具备较好的一致性;其次,从树种视角分析视觉因素与测试获取因素两个层面对树干吸声效果有影响的主要因素;最后,通过模拟对比分析15 m宽植物带种植不同树种的降噪效果,发现相差∼0.9 dBA,证明了种植吸声系数高的树种对交通噪声控制的有效性。以期从树形、树干吸声效果、树种生长速度以及种植方式等方面,提出应对城市交通噪声污染的树种筛选依据与设计策略。

关键词：噪声控制交通噪声吸声系数自然降噪途径

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Semiconductor nanostructures enabled by aerosol tech.ology

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Frontiers of ph.sics 2014年第3期9卷 398-418页

作者： Martin h. Magnusson B. Jonas Oh.sson Mikael T. Bjork Kimberly A. dick Magnus T. Borgstrom Knut Deppert Lars Samuelson Solid State Ph.sics Lund University Box 118 SE-22100 Lund Sweden Sol Voltaics AB Ideon Science Park Scheelevagen 17 SE-22370 Lund Sweden QuNano AB Ideon Science Park Scheelevaigen 17 SE-22370 Lund Sweden Center for Analysis and Synth.sis Lund University Box 124 SE-22100 Lund Sweden

Aerosol tech.ology provides efficient meth.ds for producing nanoparticles with.well-controlled composition and size distribution. Th.s review provides an overview of meth.ds and results obtained by using aerosol tech.ology for producing nanostruetures for a variety of applications in semiconductor ph.sics and device tech.ology. Examples are given from： production of metal and metal alloy particles： semiconductor nanoparticles; semiconductor nanowires, grown both.in th. aerosol ph.se and on substrates; ph.sics studies based on individual aerosol-generated devices; and large area deviees based on aerosol particles.

关键词： aerosol nanoparticle nanowire metal-organic vapor ph.se epitaxy (MOVPE) device ph.sics ligh. emitting diodes (LED) solar cell

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激光性角膜手术与眼内屈光手术矫治超高度近视眼

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国际眼科杂志 2008年第10期8卷 2071-2073页

作者：杨阳何阳 h. burkh.rd dick 中国云南省昆明市延安医院眼科 650051 Department of Opth.lomology Johannes Gutenberg-UniversityMainzGermany

目的:评价及探讨矫治超高度近视眼的各类屈光手术的有效性、稳定性和安全性。方法:随机选择临床中观察到的超高度近视患者行各类屈光手术者108眼,近视范围-10.00～-24.50D,术前屈光度平均为(-12.25±1.53)D,散光平均为(-1.52±0.55)D;... 详细信息

目的:评价及探讨矫治超高度近视眼的各类屈光手术的有效性、稳定性和安全性。方法:随机选择临床中观察到的超高度近视患者行各类屈光手术者108眼,近视范围-10.00～-24.50D,术前屈光度平均为(-12.25±1.53)D,散光平均为(-1.52±0.55)D;手术方式的选择:(1)I组52眼,行LASIK术:(2)II组23眼,行透明晶状体超声乳化摘除加后房型人工晶状体植入术。(3)III组33眼行有晶状体眼虹膜固定型人工晶状体植入术。术后随访观察平均6mo,主要观察术后裸眼视力、最佳矫正视力、屈光度、眼压及眼前段、眼底情况。结果:三组术后裸眼视力均比术前提高,术后裸眼视力≥0.5者分别是42眼(80.8%),20眼(87.0%),28眼(84.8%),术后屈光度分别为(-2.10±2.38)D,(-1.75±1.33)D,(0.83±1.16)D,主要并发症I组术后6mo黄斑出血1眼,II组术后15mo视网膜脱离1眼,III组平均角膜内皮细胞丢失率为4.5%。结论:对于超高度近视,晶状体性屈光手术效果优于LASIK术。对超高度近视行屈光手术,要根据患者年龄,眼部情况,手术医师的技术等,选择安全、有效、稳定性好的手术。

关键词：高度近视/外科手术角膜磨镶术激光原位晶状体/外科手术

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Remediation of saline–sodic soil with.flue gas desulfurization gypsum in a reclaimed tidal flat of south.ast Ch.na

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Journal of Environmental Sciences 2016年第7期28卷 224-232页

作者： Yumei Mao Xiaping Li Warren A.dick Liming Ch.n East Ch.na Normal University Shanghai 200062China Th. Oh.o State University The Ohio Agricultural Research and Development CenterWoosterOH 44691USA

Salinization and sodicity are obstacles for vegetation reconstruction of coastal tidal flat soils. A study was conducted with.flue gas desulfurization（FGD）-gypsum applied at rates of 0, 15, 30, 45 and 60 Mg/h. to remediate tidal flat soils of th. Yangtze River *** sodium percentage（ESP）, exch.ngeable sodium（ExNa）, p h. soluble salt concentration, and composition of soluble salts were measured in 10 cm increments from th. surface to 30 cm depth.after 6 and 18 month.. Th. results indicated th.t th. effect of FGD-gypsum is greatest in th. 0–10 cm mixing soil layer and 60 Mg/h. was th. optimal rate th.t can reduce th. ESP to below 6% and decrease soil p h.to neutral（7.0）. Th. improvement effect was reach.d after 6 month., and remained after 18 month.. Th. composition of soluble salts was transformed from sodic salt ions mainly containing Na~＋, h.O_3^-＋ CO_3^（2-）and Cl-to neutral salt ions mainly containing Ca^（2＋）and SO_4^（2-）. Non-h.loph.te plants were survived at 90%. Th. study demonstrates th.t th. use of FGD-gypsum for remediating tidal flat soils is promising.

关键词： FGD-gypsum Saline–sodic soil Tidal flat ESP Composition of soluble salt

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Utilization of Th.rmally Treated Flue Gas Desulfurization (FGD) Gypsum and Class-C Fly Ash.(CFA) to Prepare CFA-Based Geopolymer

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Journal of Wuh.n University of Tech.ology(Materials Science) 2013年第1期28卷 132-138页

作者：郭晓潞施惠生 Warren A dick Key Laboratory of Advanced Civil Engineering Materials (Tongji University) Ministry of Education Sch.ol of Environment and Natural Resources the Ohio State University

Th. feasibility of utilization of flue gas desulfurization （FGD） gypsum and Class-C fly ash.（CFA） to prepare CFA-based geopolymer were studied. Th. results sh.wed th.t geopolymer made from 90% CFA and 10% FGD gypsum （FGDG） wh.ch.was th.rmally treated at 800 ℃ for 1 h.obtained th. better compressive strength.of 37.0 MPa. Th. micro ch.racteristics and structures of th. geopolymer samples of CFA and CFA-FGDG were tested by Xrd, FT-IR, and SEM-EDXA after th.se samples cured at 75 ℃ for 8 h.followed by 23 ℃ for 28 d. Both.th. geopolymer samples of CFA and CFA-FGDG h.ve significant asymmetric stretch.ng of A1-O/Si-O bonds and Si-O-Si / Si-O-A1 bending band. In geopolymer sample of CFA-FGDG, a small quantity of lath. products probably being th. ettringite wrapped over th. sph.rical fly ash.particle, and th. concentration of sulfur is much.more th.n th.t in geopolymer sample of CFA. It is indicated th.t FGD gypsum may react during alkali-activated and geopolymeric process.

关键词： flue gas desulph.rization (FGD)gypsum class-C fly ash.CFA) geopolymer th.rmal treatment

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Reconstructing sh.ck front of unstable detonations based on multi-layer perceptron

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Acta Mech.nica Sinica 2021年第11期37卷 1610-1623,I0001页

作者： Lin Zh.u h.ngh.i Teng h.i dick Ng Pengfei Yang Zonglin Jiang Sch.ol of Aerospace Engineering Beijing Institute of TechnologyBeijing100081China State Key Laboratory of Laser Propulsion and Application Beijing Power Machinery InstituteBeijing100074China Department of Mech.nical Industrial and Aerospace EngineeringConcordia UniversityMontrealQCH3G 1M8Canada State Key Laboratory of h.gh.Temperature Gas Dynamics Institute of MechanicsChinese Academy of SciencesBeijing100190China Sch.ol of Engineering Sciences University of Chinese Academy of SciencesBeijing100049China

Th. dynamics of frontal and transverse sh.cks in gaseous detonation waves is a complex ph.nomenon bringing many difficulties to both.numerical and experimental *** laser-optical visualization of detonation structure may provide certain information of its reactive front,but th. corresponding lead sh.ck needs to be reconstructed building th. complete flow *** th. multi-layer perceptron(MLP)approach.we propose a sh.ck front reconstruction meth.d wh.ch.can predict evolution of th. lead sh.ck wavefront from th. state of th. reactive *** meth.d is verified th.ough.th. numerical results of one-and two-dimensional unstable detonations based on th. reactive Euler equations with.a one-step irreversible ch.mical reaction *** sh.w th.t th. accuracy of th. proposed meth.d depends on th. activation energy of th. reactive mixture,wh.ch.influences prominently th. cellular detonation instability and h.nce,th. distortion of th. lead sh.ck *** select th. input variables for training and evaluate th.ir influence on th. effectiveness of th. proposed meth.d,five groups,one with.six variables,and th. oth.r with.four variables,are tested and analyzed in th. MLP *** trained MLP is tested in th. cases with.different activation energies,demonstrates th. inspiring generalization *** paper offers a universal framework for predicting detonation frontal evolution and provides a novel way to interpret numerical and experimental results of detonation waves.

关键词： Cellular detonation Lead sh.ck evolution Multi-layer perceptron Numerical simulations

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Th. Inh.ritance and Variation of Gum Content in Guar [Cyamopsis tetragonoloba (L.) Taub.]

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Agricultural Sciences in Ch.na 2009年第12期8卷 1517-1522页

作者： LIU Wei-xin h.U An-fu Ellen B Peffiey dick L Auld College of h.rticulture Qingdao Agricultural University Qingdao 266109 P.R. China Department of Plant ＆ Soil Sciences Texas Tech University Lubbock TX 79409 USA

Guar [Cyamopsis tetragonoloba （L.） Taub.] is one of th. most important industrial crops due to its rich.ess in gum. Understanding th. inh.ritance of gum content is a key to its successful genetic improvement. Gum content expression is reported to be controlled by additive, dominant, and epistatic effects, and modified by th. environment, fg%, a relative gum content calculated by comparing with.th. gum content of Kinman was used as gum content （%） in th.s experiment. Reciprocal crosses of two lines of guar, PI 217923 and Lewis, were made to study th. h.ritability of gum content （fg%）. fg% of four plant introductions and four commercial varieties were studied in Lubbock in 1999-2002. Estimates of broadsense h.ritability （h.2 b,s.） of fg% in Lewis x PI 217923 and PI 217923 x Lewis were 75.53 and 52.74%, respectively. Estimates of narrow-sense h.ritability （h. n.s.） of fg% were 40.00 and 29.00% th. Lewis x PI 217923 and PI 217923 x Lewis, respectively. At least one pair of genes were estimated to control th. fg% expression in th.se two crosses, Significant differences of fg% were found among th.se eigh. entries. PI 217923 was found to h.ve th. h.gh.st fg% among th. eigh. entries.

关键词： guar Cyamopsis tetragonoloba,gum content (fg%) h.ritability

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h.man Brain Slice Culture: A Useful Tool to Study Brain Disorders and Potential Th.rapeutic Compounds

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Neuroscience Bulletin 2019年第2期35卷 244-252页

作者： Xin-Rui Qi Ronald W.h.Verwer Ai-Min Bao Rawien A.Balesar Sabina Luch.tti Jiang-Ning Zh.u dick F.Swaab Center for Translational Neurodegeneration and Regenerative Th.rapy Shanghai Tenth People's Hospital Affiliated to Tongji University School of Medicine Department of Neuropsych.atric Disorders Netherlands Institute for NeuroscienceAn Institute of the Royal Netherlands Academy of Arts and Sciences Department of Neurobiology Institute of NeuroscienceNHC and CAMS Key Laboratory of Medical NeurobiologyZhejiang University School of Medicine Key Laboratory of Brain Function and Diseases School of Life SciencesUniversity of Science and Technology of ChinaChinese Academy of Sciences

Investigating th. path.ph.siological mech.nisms underlying brain disorders is a priority if novel th.rapeutic strategies are to be developed. In vivo studies of animal models and in vitro studies of cell lines/primary cell cultures may provide useful tools to study certain aspects of brain disorders. h.wever, discrepancies among th.se studies or unsuccessful translation from animal/cell studies to h.man/clinical studies often occur, because th.se models generally represent only some symptoms of a neuropsych.atric disorder rath.r th.n th. complete disorder. h.man brain slice cultures from postmortem tissue or resected tissue from operations h.ve sh.wn th.t, in vitro, neurons and glia can stay alive for long periods of time, wh.le th.ir morph.logical and ph.siological ch.racteristics, and th.ir ability to respond to experimental manipulations are maintained. h.man brain slices can th.s provide a close representation of neuronal networks in vivo, be a valuable tool for investigation of th. basis of neuropsych.atric disorders, and provide a platform for th. evaluation of novel ph.rmacological treatments of h.man brain diseases.A brain bank needs to provide th. necessary infrastructure to bring togeth.r donors, h.spitals, and research.rs wh. want to investigate h.man brain slices in cultures of clinically and neuropath.logically well-documented material.

关键词： Alzh.imer’s disease Brain bank Brain-derived neurotroph.c factor Depression Electrical activity h.man brain slice culture Neuropsych.atric disorders Organotypic culture Postmortem h.man brain tissue Resected h.man brain tissue

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A tech.ique for promoting detonation transmission from a confined tube into larger area for pulse detonation engine applications

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Propulsion and Power Research 2014年第1期3卷 9-14页

作者： Navid Meh.joo Rocco Portaro h.i dick Ng Department of Mech.nical and Industrial Engineering Concordia UniversityMontréalQCH3G 1M8Canada

A simple meth.d of detonation transmission from a small tube to a large area is *** tech.ique involves placing obstacles wh.ch.create sligh. blockages at th. exit of th. confined tube before th. planar detonation emerges into th. larger space,th.reby generating flow instability to promote th. detonation *** th.s experimental study two mixtures of undiluted stoich.ometric acetylene-oxygen and acetylene-nitrous oxide are *** mixtures can be ch.racterized by a cellular detonation front th.t is irregular and representative of th.se potentially used in practical aerospace *** blockage ratio imposed by th. obstacles is varied systematically to identify th. optimal condition under wh.ch.a significant reduction in critical pressure for transmission can be obtained.A new perturbation configuration for practical use in propulsion and power systems is also introduced and results are in good agreement with.th.se obtained using th.n needles as th. blockage ratio is kept constant.

关键词： Combustion Detonation Pulse detonation engines Diffraction Perturbation Reactive flow

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