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Numerical simulation on borehole breakout and borehole size effect using discrete element method

International journal of Mining Science and Technology 2020年第5期30卷 623-633页

作者： H.Lin W.H.Kang j.oh I.Canbulat B.Hebblewhite School of Minerals and Energy Resources Engineering University of New South WalesSydneyNSW 2052Australia Centre for Infrastructure Engineering Western Sydney UniversityPenrithNSW 2751Australia

Estimation of horizontal stress magnitudes from borehole breakouts has been an attractive topic in the petroleum and mining industries,although there are critical research gaps that remain *** this paper,numerical simulation is conducted on Gosford sandstone to investigate the borehole breakout and its associated borehole size effect,including temperature *** discrete element method(DEM)model shows that the borehole breakout angular span is constant after the initial formation,whereas its depth propagates along the minimum horizontal stress *** indicates that the breakout angular span is a reliable parameter for horizontal stress *** borehole size effect simulations illustrated the importance of borehole size on breakout geometries in which smaller borehole size leads to higher breakout initiation stress as well as the stress re-distribution from borehole wall outwards through *** implies that the stress may be averaged over a distance around the borehole and breakout initiation occurs at the borehole wall rather than some distance into the *** addition,the numerical simulation incorporated the thermal effect which is widely encountered in deep geothermal *** on the results,the higher temperature led to lower breakout initiation stress with same borehole size,and more proportion of shear cracks was generated under higher *** indicates that the temperature might contribute to the micro-fracturing mode and hence influences the horizontal stress estimation results from borehole breakout *** simulation showed that breakout shape and dimensions changed considerably under high stress and high temperature conditions,suggesting that the temperature may need to be considered for breakout stress analysis in deep locations.

关键词： Borehole breakout Breakout angular span Borehole size effect Numerical simulation Thermal effect

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Prospective study of Centurion~？ versus Infiniti~？ phacoemulsification systems： surgical and visual outcomes

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International journal of Ophthalmology(English edition) 2017年第11期10卷 1698-1702页

作者： Lawrence j.oh Chu Luan Nguyen Eugene Wong Samuel S.Y.Wang Ian C.Francis University of New South Wales Sydney 2000 Australia Department of Ophthalmology Prince of Wales Hospital Sydney 2031 Australia Chatswood Private Hospital Chatswood Sydney 2067 Australia

AIM： To evaluate surgical outcomes（SOs） and visual outcomes（VOs） in cataract surgery comparing the Centurion？ phacoemulsification system（CPS） with the Infiniti？ phacoemulsification system（IPS）.METHODS： Prospective, consecutive study in a singlesite private practice. Totally 412 patients undergoing cataract surgery with either the CPS using the 30-degree balanced？ tip（n=207） or the IPS using the 30-degree Kelman？ tip（n=205）. Intraoperative and postoperative outcomes were documented prospectively up to one month follow-up. Nuclear sclerosis（NS） grade, cumulated dissipated energy（CDE）, preoperative corrected distance visual acuity（CDVA）, and CDVA at one month were recorded. RESULTS： CDE was 13.50% less in the whole CPS compared with the whole IPS subcohort. In eyes with NS grade III or greater, CDE was 28.87% less with CPS（n=70） compared with IPS（n=44）（P=0.010）. Surgical complications were not statistically different between the two subcohorts（P=0.083）, but in the one case of vitreous loss using the CPS, CDVA of 6/4 was achieved at one month. The mean CDVAs（VOs） at one month for NS grade III and above cataracts were-0.17 log MAR（6/4.5） in the CPS and-0.15 log MAR（6/4.5） in the IPS subcohort respectively（P=0.033）.CONCLUSION： CDE is 28.87% less, and VOs are significantly improved, in denser cataracts in the CPS compared with the IPS. The authors recommend the CPS for cases with denser nuclei.

关键词： phacoemulsification Infiniti Centurion cumulated dissipated energy visual and surgical outcomes

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采用常规MR成像和扩散张量成像的影像组学和机器学习可准确预测脑膜瘤分级和组织学分型

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国际医学放射学杂志 2019年第5期 627-628页

作者： Y.W.Park j.oh S.C.You K.Han S.S.Ahn Y.S.Choi 彭攀 Department of Radiology Ewha Womans University College of Medicine

摘要目的术前对脑膜瘤进行无创性分级预测至关重要,因其会影响后续治疗决策的制定。本研究的目的在于评估基于全肿瘤体积的T;增强扫描（T;C）、表观扩散系数

关键词：扩散张量成像组织学分型影像组学 MR 机器学习

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韩国现代并联混合动力节油驾驶策略的研究

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汽车与新动力 2019年第5期2卷 24-30页

作者： j.S.EO[韩] S.j.KIM[韩] j.oh[韩] Y.K.CHUNG[韩] Y.j.CHANG[韩] 陈佳(译) 不详

验证加速-滑行PnG驾驶策略在并联混合动力汽车上的节油效果。研究电动控制模式(电力电子元件全负荷工作)、机械控制模式(电力电子元件按需少量工作)和混合控制模式(电力电子元件部分负荷工作)等PnG驾驶策略。电动控制模式PnG驾驶策略中... 详细信息

验证加速-滑行PnG驾驶策略在并联混合动力汽车上的节油效果。研究电动控制模式(电力电子元件全负荷工作)、机械控制模式(电力电子元件按需少量工作)和混合控制模式(电力电子元件部分负荷工作)等PnG驾驶策略。电动控制模式PnG驾驶策略中动力电池的充电与放电由保持恒定车速的需求功率决定。机械控制模式PnG驾驶策略中动力电池的使用率最小化、车辆的加速与减速由需求功率决定。混合控制模式PnG驾驶策略则综合了上述2种策略,并在两者之间找到平衡点。研究了在实现目标车速跟踪时燃油效率和车辆驾驶性之间的折中关系。为了评估上述驾驶策略的可行性,分类记录和分析了传动系统的能量损失,包括发动机热损失、发动机摩擦损失、电损失和阻力损失。其中,电损失指动力系统电子元件的全部电能损失,阻力损失指空气阻力和滚动阻力等行驶阻力所产生的能量损失。采用定量分析不同驾驶策略的各种损失和燃油效率。试验在1台装有汽油发动机、变速器集成电驱动模块和6速双离合变速器的实车上进行。

关键词：高效驾驶超级节油加速-滑行双离合变速器集成电驱动模块

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Laser-direct-drive program: Promise, challenge, and path forward

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Matter and Radiation at Extremes 2017年第2期2卷 37-54页

作者： E.M.Campbell V.N.Goncharov T.C.Sangster S.P.Regan P.B.Radha R.Betti j.F.Myatt D.H.Froula M.j.Rosenberg I.V.Igumenshchev W.Seka A.A.Solodov A.V.Maximov j.A.Marozas T.j.B.Collins D.Turnbull F.j.Marshall A.Shvydky j.P.Knauer R.L.McCrory A.B.Sefkow M.Hohenberger P.A.Michel T.Chapman L.Masse C.Goyon S.Ross j.W.Bates M. Karasik j.oh j.Weaver A.j.Schmitt K.Obenschain S.P.Obenschain S.Reyes B.Van Wonterghem Laboratory for Laser Energetics University of RochesterRochesterNYUSA Lawrence Livermore National Laboratory LivermoreCAUSA Naval Research Laboratory WashingtonDCUSA

Along with laser-indirect(X-ray)-drive and magnetic-drive target concepts,laser direct drive is a viable approach to achieving ignition and gain with inertial confinement *** the United States,a national program has been established to demonstrate and understand the physics of laser direct *** program utilizes the Omega Laser Facility to conduct implosion and coupling physics at the nominally 30-kj scale and lasereplasma interaction and coupling physics at the Mj scale at the National Ignition *** article will discuss the motivation and challenges for laser direct drive and the broad-based program presently underway in the United States.

关键词： Inertial fusion Direct drive Laser interactions Hydrodynamics Omega National ignition facility

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Extraction of rare earth elements from neodymium(NdFeB) magnet scrap using magnesium halides

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journal of Rare Earths 2025年第2期43卷 371-376页

作者： Sung Gue Heo jae Yeol Yang Soong ju oh Seok-jun Seo Mi Hye Lee Kyoung-Tae Park Korea Institute for Rare Metals Korea Institute of Industrial Technology Department of Materials Science and Engineering Korea University

The demand for neodymium（NdFeB） permanent magnets for electric vehicles and eco-friendly generators is ***,NdFeB magnets contain rare earth elements（REEs）,which are limited in *** this study,we performed an exchange reaction between magnesium halides（fluoride and chloride） and waste NdFeB scrap and then compared the characteristics of the extracted halides *** compositions of the ternary Mg fluoride（LiF:NaF:MgF2=50:40:10 in mole ratio） and chloride（LiCl:NaCl:MgCl2=10:50:40 in mole ratio） salts were thermodynamically determined for achieving low eutectic *** reactions between the NdFeB scrap powder（1-2 mm） and Mg halide salts were carried out at 1073 and 873 K for the fluoride and chloride systems,respectively,in an argon *** the reaction,we separated Nd halide from the residual salt and evaluated the Ndextraction *** phase formation of the salt was analyzed using X-ray diffraction（XRD）,and the extraction rate of Nd was analyzed using inductively coupled plasma optical emission spectroscopy（ICPOES）.Nd was extracted in the form of Nd halide（NdF3or NdCl3）,and the extraction rates in the fluoride and chloride systems are 98.64% and 84.59%,***,the fluoride system is more effective than the chloride system for Nd *** study provides a comprehensive comparative analysis of the effectiveness of fluo ride and chlo ride systems in extracting REEs from NdFeB magnet *** study findings can be used to develop an effective method for recycling magnet scraps.

关键词： Fluoride system Magnesium halide Metal-scrap recycling Nd extraction Neodymium magnet Rare earth elements

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Apples to oranges:environmentally derived,dynamic regulation of serotonin neuron subpopulations in adulthood?

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Neural Regeneration Research 2025年第9期20卷 2596-2597页

作者： Christopher j.O’Connell Matthew j.Robson Department of Genetics College of MedicineHarvard UniversityBostonMAUSA james L.Winkle College of Pharmacy Division of Pharmaceutical SciencesUniversity of CincinnatiCincinnatiOHUSA Neuroscience Graduate Program College of MedicineUniversity of CincinnatiCincinnatiOHUSA

Traumatic brain injury(TBI)is a public health problem with an undue economic burden that impacts nearly every age,ethnic,and gender group across the globe(Capizzi et al.,2020).TBIs are often sustained during a dynamic range of exposures to energetic environmental forces and as such outcomes are typically heterogeneous regarding severity and pathology(Capizzi et al.,2020).

关键词： sustained orange dynamic

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Temporal dynamics of neonatal hypoxic-ischemic encephalopathy injuries on magnetic resonance imaging

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Neural Regeneration Research 2025年第11期20卷 3144-3150页

作者： Holly Flyger Samantha j.Holdsworth Alistair j.Gunn Laura Bennet Hamid Abbasi Mātai Medical Research Institute Tairāwhiti GisborneNew Zealand Department of Anatomy&Medical Imaging Faculty of Medical and Health SciencesThe University of AucklandAucklandNew Zealand Center for Brain Research The University of AucklandAucklandNew Zealand Auckland Bioengineering Institute The University of AucklandAucklandNew Zealand

Moderate to severe perinatal hypoxic-ischemic encephalopathy occurs in~1 to 3/1000 live births in high-income countries and is associated with a significant risk of death or neurodevelopmental *** assessment is important to help identify highrisk infants,to help families,and to support appropriate interventions.A wide range of monitoring tools is available to assess changes over time,including urine and blood biomarkers,neurological examination,and *** present,magnetic resonance imaging is unique as although it is expensive and not suited to monitoring the early evolution of hypoxic-ischemic encephalopathy by a week of life it can provide direct insight into the anatomical changes in the brain after hypoxic-ischemic encephalopathy and so offers strong prognostic information on the long-term outcome after hypoxic-ischemic *** review investigated the temporal dynamics of neonatal hypoxic-ischemic encephalopathy injuries,with a particular emphasis on exploring the correlation between the prognostic implications of magnetic resonance imaging scans in the first week of life and their relationship to long-term outcome prediction,particularly for infants treated with therapeutic hypothermia.A comprehensive literature search,from 2016 to 2024,identified 20 pertinent *** review highlights that while the optimal timing of magnetic resonance imaging scans is not clear,overall,it suggests that magnetic resonance imaging within the first week of life provides strong prognostic *** challenges limit the timing consistency,particularly the need for intensive care and clinical ***,although most reports examined the prognostic value of scans taken between 4 and 10 days after birth,there is evidence from small numbers of cases that,at times,brain injury may continue to evolve for weeks after *** suggests that in the future it will be important to explore a wider range of times after hypo

关键词： magnetic resonance imaging neonatal hypoxic-ischemic encephalopathy neurodevelopmental outcomes prognostic biomarkers in neuroimaging scan timing therapeutic hypothermia

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Gene therapy for spinal muscular atrophy:perspectives on the possibility of optimizing SMN1 delivery to correct all neurological and systemic perturbations

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Neural Regeneration Research 2025年第7期20卷 2011-2012页

作者： Sharon j.Brown Rafael j.Yáñez-Muñoz Heidi R.Fuller School of Pharmacy and Bioengineering Keele UniversityKeeleUK Wolfson Center for Inherited Neuromuscular Disease TORCH BuildingRJAH Orthopaedic HospitalOswestryUK *** Center of Gene and Cell TherapyDepartment of Biological SciencesSchool of Life Sciences and the EnvironmentRoyal Holloway University of LondonEghamUK

Spinal muscular atrophy(SMA)is a genetic condition that results in selective lower motor neuron loss with concomitant muscle weakness and *** genetic cause of SMA was understood in 1995 when loss or impairment of the survival motor neuron 1(SMN1)gene was identified as the main contributing factor(Lefebvre et al.,1995).This,in combination with the discovery that humans have a“back-up”gene,SMN2,which can produce low levels(approximately 10%)of the full-length functional SMN protein,has led to the generation of SMA-specific gene *** was traditionally classified according to age of symptom onset and developmental milestones achieved,with life expectancy and severity varying between ***,SMN2 copy number is used as a proxy for the prediction of disease severity,with higher SMN2 copy number typically being associated with reduced severity of SMA,although this relationship is not absolute:some individuals with low SMN2 copy number have less severe SMA phenotypes and vice ***,the etiology of SMA is further complicated by other factors,such as non-typical nucleotide variants and SMN2-independent modifiers of disease severity.

关键词： atrophy traditionally absolute

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An enhanced close-in phase noise LC-VCO using parasitic V-NPN transistors in a CMOS process

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journal of Semiconductors 2009年第8期30卷 123-126页

作者：高佩君 oh N j 闵昊 State Key Laboratory of ASIC & System Fudan University Department of Electronic Engineering Chungju National University

A differential LC voltage controlled oscillator （VCO） employing parasitic vertical-NPN （V-NPN） transistors as a negative gm-cell is presented to improve the close-in phase noise. The V-NPN transistors have lower flicker noise compared to MOS transistors. DC and AC characteristics of the V-NPN transistors are measured to facilitate the VCO design. The proposed VCO is implemented in a 0.18 μm CMOS RF/mixed signal process, and the measurement results show the close-in phase noise is improved by 3.5-9.1 dB from 100 Hz to 10 kHz offset compared to that of a similar CMOS VCO. The proposed VCO consumes only 0.41 mA from a 1.5 V power supply.

关键词： close-in phase noise vertical-NPN flicker noise VCO

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