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Regrowth-Free Processing for GaAs and InP Photonic Integrated Circuits

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光学学报 2003年第S1期23卷 443-444页

作者： john h. marsh Intense Photonics Ltd 4 Stanley Boulevard High Blantyre G72 OBN Scotland UK

Technologies are described for integrating multiple bandgaps and photonic crystal structures monolithically in a semiconductor chip. Practical devices examples include high power 980 nm pumps, 2×2 crosspoint switches... 详细信息

关键词： for in In of mode Regrowth-Free Processing for GaAs and InP Photonic Integrated Circuits have high been

The emotional life of the Great Depression

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The emotional life of the Great Depression

Sorption of inorganic nanoparticles in woven cellulose fabrics

作者： john marsh.

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Particuology 2009年第2期7卷 121-128页

作者： Dan h. marsh D. Jason Riley David York Andrew Graydon School of Chemistry University of NottinghamUniversity ParkNottinghamNG7 the School of Chemistry University of BristolCantocks CloseBristolBS8 1TSUK.2RDUK Department of Materials Imperial College LondonExhibition RoadLondonSW7 2AZUK the School of Chemistry University of BristolCantocks CloseBristolBS8 1TSUK. Procter & Gamble Technical Centres Ltd. Newcastle Upon TyneNE12 9TSUK

Titanium dioxide was deposited from aqueous suspension onto cellulosic surfaces. Titania was sourced from Degussa （P25TM, 70：30 anatase：rutile）. Dry uptake of particles was shown to be rapid and dominant with one-third of the deposition occurring in less than 30 s and over one-half in the first minute. Isotherms were recorded to compare the rate of titanium deposition on dry and pre-wetted cotton. In the dry case uptake reached a maximum in 30 min whereas in the pre-wetted case the uptake was seen to continue beyond 180 min. A broad trend of higher deposition occurring at lower ph was seen, corresponding to the region where surface charges were opposite and thus attractive. Dry pickup was less significant at high ph. The response to varying ionic strength was complex and was attributed to the combined effect of charge screening, particle aggregation and consequent particle entrapment or occlusion. Titania deposition into the interstices of woven cotton sheets resulted in the formation of inorganic, nanoparticulate skeletons which could be isolated by controlled combustion of the cellulose and thus cotton was suggested to have potential for the templated synthesis of high surface area semiconductor materials.

关键词： Titania Cellulose Sorption Zeta potential Templated material

Reverse-Time Prestack Depth Migration of GPR Data from Topography for Amplitude Reconstruction in Complex Environments

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Journal of Earth Science 2015年第6期26卷 791-798页

作者： john h.Bradford Center for Geophysical Investigation of the Shallow Subsurface Boise State University

With increased computational power, reverse-time prestack depth migration（RT-PSDM） has become a preferred imaging tool in seismic exploration, yet its use has remained relatively limited in ground-penetrating radar（GPR） applications. Complex topography alters the wavefield kinematics making for a challenging imaging problem. Model simulations show that topographic variation can substantially distort reflection amplitudes due to irregular wavefield spreading, attenuation anomalies due to irregular path lengths, and focusing and defocusing effects at the surface. The effects are magnified when the topographic variations are on the same order as the depth of investigation––a situation that is often encountered in GPR investigations. here, I use a full wave-equation RT-PSDM algorithm to image GPR data in the presence of large topographic variability relative to the depth of investigation. The source and receiver wavefields are propagated directly from the topographic surface and this approach inherently corrects for irregular kinematics, spreading and attenuation. The results show that when GPR data are acquired in areas of extreme topography, RT-PSDM can accurately reconstruct reflector geometry as well as reflection amplitude.

关键词： reverse-time prestack depth migration ground-penetrating radar topography wavefield reflector geometry reflection amplitude.

氧化作用对针状焦及煤萃取焦的强度和结构的影响

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炭素技术 1984年第5期 34-37页

作者： S.Ragan h.marsh 田本道

工业煅烧针状焦和煤萃取焦在磨光面的光学显微图象方面有明显区别,针状焦具有粗粒嵌晶结构、流线区和针状流线区等光学显微组织。煤萃取焦具有中粒及粗粒嵌晶结构的光学显微组织。把这两种焦炭在空气中氧化达1～25％重量损失,然后测定... 详细信息

工业煅烧针状焦和煤萃取焦在磨光面的光学显微图象方面有明显区别,针状焦具有粗粒嵌晶结构、流线区和针状流线区等光学显微组织。煤萃取焦具有中粒及粗粒嵌晶结构的光学显微组织。把这两种焦炭在空气中氧化达1～25％重量损失,然后测定原焦炭及氧化过的焦炭的微强度。对针状焦来说,1％重量损失就可以明显地降低微强度值,而对煤萃取焦只有在15％重量损失以后,微强度开始降低。扫描电子显微技术对原表面及氧化了的表面的检查指出,针状焦的氧化是通过流线区内的微裂纹的发展以及针状流线区的基本表面的烧蚀而发生的。煤萃取焦表面是均匀烧蚀的。针状焦微强度值的下降与炭粒子的内部氧化有关。

关键词：针状焦石墨材料焦炭固体燃料石墨化碳流线空间动线氧化作用

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中间相沥青纤维的氧化

新型碳材料 1986年第2期 50-52页

作者：嘉数隆敬 h.marsh 茅秀彬

绪言纺丝所得的沥青纤维经过氧化处理就可防止碳化过程中纤维的熔融和熔结,这种不熔化过程对于制取沥青系碳纤维是必要的。工业上的不熔化过程,处理时间较长,这不仅增大了装置等固定资产投资,而且也导致不经济运行。由于人们对于沥青... 详细信息

绪言纺丝所得的沥青纤维经过氧化处理就可防止碳化过程中纤维的熔融和熔结,这种不熔化过程对于制取沥青系碳纤维是必要的。工业上的不熔化过程,处理时间较长,这不仅增大了装置等固定资产投资,而且也导致不经济运行。由于人们对于沥青纤维表面的氧化反应的研究非常有限,因此,对这种反应的机理作出明确的解释,对于缩短不溶化时间是不可缺少

关键词：中间相沥青熔化过程氧化处理氧化反应固定资产投资碳化过程处理时间氧化沥青空气氧化法经济运行

Boosting corticospinal system synaptic plasticity to recover motor functions

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Neural Regeneration Research 2023年第10期18卷 2182-2183页

作者： Weiguo Song john h.Martin Feinstein Institutes for Medical Research ManhassetNYUSA Department of Molecular Cellularand Biomedical SciencesCenter for Discovery and Innovation Neuroscience Program Graduate Center of the City University of New YorkNew YorkNYUSA

An importa nt strategy to promote voluntary movements after motor system injury is to strengthen the connections between the motor cortex and muscles by taking advantage of the plasticity of the corticospinal motor *** neuromodulation approaches are directed to activate the spinal cord and peripheral axons to strengthen muscle *** discuss in this perspective that,the cortex and spinal cord should be ta rgeted together to enhance cortex-to-musclefunction(Amer and Martin,2022).

关键词： plasticity system activation

Eyes and stroke:the visual aspects of cerebrovascular disease

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Stroke & Vascular Neurology 2017年第4期2卷 211-221页

作者： john h Pula Carlen A Yuen Department of Neurology NorthShore University HealthSystemChicagoIllinoisUSA Department of Neurology University of ChicagoChicagoIllinoisUSA

A large portion of the central nervous system is dedicated to vision and therefore strokes have a high likelihood of involving vision in some *** loss can be the most disabling residual effect after a cerebral *** vision problems can likewise be a harbinger of stroke and prompt evaluation after recognition of visual symptoms can prevent future vascular *** this review,we discuss the visual aspects of ***,anatomy and the vascular supply of the visual system are ***,the different stroke syndromes which involve vision are ***,topics involving the assessment,prognosis,treatment and therapeutic intervention of vision-specific stroke topics are reviewed.

关键词： anatomy ed. visual

Crack-free high-aspect ratio holes in glasses by top–down percussion drilling with infrared femtosecond laser Ghz-bursts

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International Journal of Extreme Manufacturing 2023年第1期5卷 193-200页

作者： Pierre Balage john Lopez Guillaume Bonamis Clemens hönninger Inka Manek-hönninger Universitéde Bordeaux-CNRS-CEA CELIA UMR 510733405 TalenceFrance Amplitude Citéde la Photonique11 Avenue de Canteranne33600 PessacFrance

We report novel results on top-down percussion drilling in different glasses with femtosecond laser *** to this particular regime of light–matter interaction,combining non-linear absorption and thermal cumulative effects,we obtained crack-free holes of aspect ratios exceeding 30 in sodalime and 70 in fused *** results are discussed in terms of inner wall morphology,aspect ratio and drilling speed.

关键词： femtosecond laser glass Ghz-bursts percussion drilling