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Blast waveform tailoring using controlled venting in blast simulators and shock tubes

Defence Technology（防务技术） 2024年第7期37卷 14-26页

作者： edward Chern Jinn Gan Alex Remennikov David Ritzel Faculty of Engineering and Information Sciences University of WollongongWollongongNSW2522Australia Dyn-FX Consulting Ltd 19 Laird Ave NorthAmherstburgONN9V 2T5Canada

A critical challenge of any blast simulation facility is in producing the widest possible pressure-impulse range for matching against equivalent high-explosive *** tubes and blast simulators are often constrained with the lack of effective ways to control blast wave profiles and as a result have a limited performance *** wave shaping techniques employed in some facilities are reviewed but often necessitate extensive geometric modifications,inadvertently cause flow anomalies,and/or are only applicable under very specific *** paper investigates controlled venting as an expedient way for waveforms to be tuned without requiring extensive modifications to the driver or existing geometry and could be widely applied by existing and future blast simulation and shock tube *** use of controlled venting is demonstrated experimentally using the Advanced Blast Simulator(shock tube)at the Australian National Facility of Physical Blast Simulation and via numerical flow simulations with Computational Fluid *** venting is determined as an effective method for mitigating the impact of re-reflected waves within the blast *** control method also allows for the adjustment of parameters such as tuning the peak overpressure,the positive phase duration,and modifying the magnitude of the negative phase and the secondary shock of the blast *** paper is concluded with an illustration of the potential expanded performance range of the Australian blast simulation facility when controlled venting for blast waveform tailoring as presented in this paper is applied.

关键词： Advanced blast simulator Shock wave propagation Far-field explosion Blast loads Blast waves Computational fluid dynamics

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科比·布莱恩特：我的篮球，我的生活

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英语学习 2016年第7期 8-13页

作者： edward ordman 丁玎卢青亮

拉斯维加斯大道往东四英里外，早已过了灯红酒绿的繁华街区，山谷高中体育馆里阴冷潮湿．弥漫着地板蜡和旧袜子的气味。篮球打在抛过光的硬木地板上．回音从常见的施釉混凝土内壁反射回来。球鞋吱吱作响。人声高低起伏，夹杂着咒骂声和... 详细信息

拉斯维加斯大道往东四英里外，早已过了灯红酒绿的繁华街区，山谷高中体育馆里阴冷潮湿．弥漫着地板蜡和旧袜子的气味。篮球打在抛过光的硬木地板上．回音从常见的施釉混凝土内壁反射回来。球鞋吱吱作响。人声高低起伏，夹杂着咒骂声和欢笑声。大喜和大悲常常于刹那之间在同一张脸上上演。没有粉丝，没有体育新闻记者。没有废话，没有自我．没有争吵。什么都没有．只有这个球场、这场比赛、这些人．和这个球——一个特别的球，普通的橙棕色．只是球上还画着两道白圈以示国际比赛用球。它在高空中划出一道弧形抛物线，同时精准地后旋。这次进球的背后是曾经无数次的投篮．数十万次甚至可能数百万次命中或是没命中的投篮，年复一年，从意大利到费城．他独自—人在体育馆里、车道上、运动场上一遍遍地练习着……

关键词：篮球布莱恩科比生活比赛用球拉斯维加斯体育馆新闻记者

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Reflections on Studying Huang Di Nei Jing in the West

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Chinese Medicine and Culture 2024年第1期7卷 72-76页

作者： edward Neal Apricot Grove Educational Services Portland 97213the United States of America Xinglin Institute for Early East Asian Medicine Portland 97213the United States of America

Huang Di Nei Jing(《黄帝内经》The Yellow Emperor’s Inner Classic) has been the source text of Chinese medicine knowledge and innovation for over two thousand years. Despite this key relevance, many of its ideas and practices have proven difficult to understand and implement fully into clinical practice. Cultural and language differences can be compounded with these challenges but may also present new opportunities for advancement and insight when studied by researchers outside of the originating culture. This article introduces the method of Classical-Text Archaeology and delves into the author’s two-decade journey of researching this text, with a discussion on cultural differences and issues of medical scholarship.

关键词： Huang Di Nei Jing Chinese medicine Nei Jing nature-based medicine Classical text research Global health Medical anthropology Classical-Text Archaeology

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Areal Roughness of the Dorsal Nail Plate

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International Journal of Dermatology and Venereology 2024年第1期7卷 27-34页

作者： Brian Lee Beatty edward Li Adaeze Anaekwe Anatomy Department NYIT College of Osteopathic MedicineOld WestburyNY 11568USA United States National Museum Smithsonian InstitutionWashingtonDC 20560USA Division of Paleobiology Friends AcademyLocust ValleyNY 11560USA

Objective:Beau lines,onychorrhexis,and psoriatic lesions of the dorsal nail plate may be missed by photographic methods,indicating a need for surface texture measurement methods that are more quantitative,sensitive,and repeatable than visual inspection or *** conducted this study to evaluate the utility of surface texture measurements of cadaveric nails that can be associated with histopathological studies in the ***:The nail plates of 4 cadaveric right pollices and halluces were cleaned and molded,cast in clear epoxy,and scanned with a Sensofar S Neox optical profilometer.A one-way analysis of variance was performed to determine statistical significance of ***:Almost no differences were observed between the pollex and hallux scans and between the distal and proximal *** greatest differences were found between *** lower magnification(5×)is less sensitive than higher magnification(20×),the lower magnification represented and characterized more of the dorsal nail ***:The dorsal nail plate areal roughness has a measurable range of values that may serve as a starting point for evaluating pathological findings,particularly Beau lines and psoriatic *** sensitivity of these techniques may be especially valuable in the recognition of less severe states of these diseases that may enable the diagnosis of earlier stages of growth disruptions(Beau lines)or *** applications could be especially useful in investigations of the health of wildlife populations or vulnerable human populations with incomplete treatment records.

关键词： nail plate surface metrology areal roughness

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DEM analysis of the influence of stirrer design on die filling with forced powder feeding

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Particuology 2024年第5期88卷 107-115页

作者： Chao Zheng edward Yost Ariel R.Muliadi Nicolin Govender Ling Zhang Chuan-Yu Wu School of Chemistry and Chemical Engineering University of SurreyGuildfordGU2 7XHUnited Kingdom Small Molecule Pharmaceutics GenentechInc.One DNA WaySouth San FranciscoCA94080USA

Die filling is a critical stage during powder compaction,which can significantly affect the product quality and *** this paper,a forced feeder is introduced attempting to improve the filling performance of a lab-scale die filling *** die filling process is analysed with a graphics processing units(GPU)enhanced discrete element method(DEM).Various stirrer designs are assessed for a wide range of process settings(i.e.,stirrer speed,filling speed)to explore their influence on the die filling performance of free-flowing *** results show that die filing with the novel helical-ribbon(i.e.,type D)stirrer design exhibits the highest filling ratio,implying that it is the most robust stirrer design for the feeder configuration ***,die filling performance with the type D stirrer design is a function of the stirrer speed and the filling speed.A positive variation of filling ratio(ηf>0%)can be ensured over the whole range of filling speed by adjusting the stirrer speed(i.e.,increasing the stirrer speed).The approach used in this study can not only help understand how the stirrer design affects the die filling performance but also guide the optimization of feeder system and process settings.

关键词： Discrete element method Die filling Forced feeding Stirrer design GPU computing

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Assimilation of GOES-R Geostationary Lightning Mapper Flash Extent Density Data in GSI 3DVar, EnKF, and Hybrid En3DVar for the Analysis and Short-Term Forecast of a Supercell Storm Case

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Advances in Atmospheric Sciences 2024年第2期41卷 263-277页

作者： Rong KONG Ming XUE edward R.MANSELL Chengsi LIU Alexandre O.FIERRO Center for Analysis and Prediction of Storms Norman Oklahoma 73072U.S.A University of Oklahoma Norman Oklahoma 73072U.S.A NOAA/National Severe Storms Laboratory NormanOklahoma 73072U.S A.4Zentralanstalt für Meteorologie und Geodynamik Department of Forecasting Models-ZAMGVienna 1190Austria

Capabilities to assimilate Geostationary Operational Environmental Satellite “R-series ”(GOES-R) Geostationary Lightning Mapper(GLM) flash extent density(FED) data within the operational Gridpoint Statistical Interpolation ensemble Kalman filter(GSI-EnKF) framework were previously developed and tested with a mesoscale convective system(MCS) case. In this study, such capabilities are further developed to assimilate GOES GLM FED data within the GSI ensemble-variational(EnVar) hybrid data assimilation(DA) framework. The results of assimilating the GLM FED data using 3DVar, and pure En3DVar(PEn3DVar, using 100% ensemble covariance and no static covariance) are compared with those of EnKF/DfEnKF for a supercell storm case. The focus of this study is to validate the correctness and evaluate the performance of the new implementation rather than comparing the performance of FED DA among different DA schemes. Only the results of 3DVar and pEn3DVar are examined and compared with EnKF/DfEnKF. Assimilation of a single FED observation shows that the magnitude and horizontal extent of the analysis increments from PEn3DVar are generally larger than from EnKF, which is mainly caused by using different localization strategies in EnFK/DfEnKF and PEn3DVar as well as the integration limits of the graupel mass in the observation operator. Overall, the forecast performance of PEn3DVar is comparable to EnKF/DfEnKF, suggesting correct implementation.

关键词： GOES-R lightning data assimilation EnKF EnVar

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Accelerated intermetallic phase amorphization in a Mg-based high-entropy alloy powder

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Journal of Magnesium and Alloys 2024年第5期12卷 1792-1798页

作者： Prince Sharma Purvam Mehulkumar Gandhi Kerri-Lee Chintersingh Mirko Schoenitz edward L.Dreizin Sz-Chian Liou Ganesh Balasubramanian Institute for Functional Materials&Devices Lehigh UniversityBethlehemPA 18015USA Center of Materials for Advanced Energetics New Jersey Institute of TechnologyNewarkNJ 07102USA

We describe a novel mechanism for the synthesis of a stable high-entropy alloy powder from an otherwise immiscible Mg-Ti rich metallic mixture by employing high-energy mechanical *** presented methodology expedites the synthesis of amorphous alloy powder by strategically injecting entropic disorder through the inclusion of multi-principal elements in the alloy *** from first principles and materials theory corroborate the results from microscopic characterizations that reveal a transition of the amorphous phase from a precursor intermetallic *** transformation,characterized by the emergence of antisite disorder,lattice expansion,and the presence of nanograin boundaries,signifies a departure from the precursor intermetallic ***,this phase transformation is accelerated by the presence of multiple principal elements that induce severe lattice distortion and a higher configurational *** atomic size mismatch of the dissimilar elements present in the alloy produces a stable amorphous phase that resists reverting to an ordered lattice even on annealing.

关键词： High-entropy alloy High-energy milling Antisite disorder Amorphous Intermetallic

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CHINESE FLYING TAXI

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今日民航 2024年第1期 126-129页

作者： edward White 不详

A Shanghai flying taxi company says that China's"low altitude"industry is edging ahead of western rivals,thanks to more supportive regulators,technological breakthroughs and cut-throat competition in the Chinese logistics *** total market created by electric vertical takeoff and landing,or eVTOL,aircraft is forecast to be worth$1.5tn a year by 2040 in a base-case assessment by Morgan Stanley analysts,with potential customers across airlines,logistics,emergency services,agriculture,tourism and securityoperations.

关键词： breakthrough operations tourism

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Activity Data and Emission Factor for Forestry and Other Land Use Change Subsector to Enhance Carbon Market Policy and Action in Malawi

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Journal of Environmental Protection 2024年第4期15卷 401-414页

作者： edward Missanjo Henry Kadzuwa Department of Environmental Sciences University of Namibia Ogongo Campus Ogongo Namibia Department of Physical Planning and Land Surveying Malawi University of Business and Applied Sciences Blantyre Malawi

Activity data and emission factors are critical for estimating greenhouse gas emissions and devising effective climate change mitigation strategies. This study developed the activity data and emission factor in the Forestry and Other Land Use Change (FOLU) subsector in Malawi. The results indicate that “forestland to cropland,” and “wetland to cropland,” were the major land use changes from the year 2000 to the year 2022. The forestland steadily declined at a rate of 13,591 ha (0.5%) per annum. Similarly, grassland declined at the rate of 1651 ha (0.5%) per annum. On the other hand, cropland, wetland, and settlements steadily increased at the rate of 8228 ha (0.14%);5257 ha (0.17%);and 1941 ha (8.1%) per annum, respectively. Furthermore, the results indicate that the “grassland to forestland” changes were higher than the “forestland to grassland” changes, suggesting that forest regrowth was occurring. On the emission factor, the results interestingly indicate that there was a significant increase in carbon sequestration in the FOLU subsector from the year 2011 to 2022. Carbon sequestration increased annually by 13.66 ± 0.17 tCO2 e/ha/yr (4.6%), with an uncertainty of 2.44%. Therefore, it can be concluded that there is potential for a Carbon market in Malawi.

关键词： Activity Data Emission Factor Climate Change Forestland Carbon Market

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Weight regain after intragastric balloon for pre-surgical weight loss

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World Journal of Gastrointestinal Surgery 2024年第7期16卷 2040-2046页

作者： Danielle Abbitt Kevin Choy Alexandra Kovar Teresa S Jones Krzysztof J Wikiel edward L Jones Department of Surgery University of ColoradoAuroraCO 80045United States Department of Surgery Rocky Mountain Regional Veteran Affairs Medical CenterAuroraCO 80045United States

BACKGROUND Over one-third of Americans carry the diagnosis of obesity,many also with obesity-related *** can place patients at increased risk of operative and postoperative *** intragastric balloon has been shown to aid in minor weight loss,however its weight recidivism in patients requiring short interval weight loss has not been well *** To evaluate weight loss,ability to undergo successful elective surgery after intragastric balloon placement,and weight management after balloon *** This study is a retrospective review of patients in a single academic institution undergoing intragastric balloon placement from 2019-2023 to aid in weight loss prior to undergoing elective *** outcomes including weight loss,duration of balloon placement,successful elective surgery,weight regain postballoon and post-procedure complications were *** criteria included those with balloon in place at time of *** Thirty-three patients completed intragastric balloon therapy from 2019-2023 as a bridge to elective *** patients were required to participate in a 12-month weight management program to be eligible for balloon *** surgeries included incisional hernia repair,umbilical hernia repair,inguinal hernia repair,and knee and hip *** average age at placement was 53 years±11 years,majority(91%)were *** average duration of intragastric balloon therapy was 186 days±41 *** average weight loss was 14.0 kg±7.4 kg and with an average percent excess body weight loss of 30.0%(7.9%-73.6%).Over half of the patients(52.0%)achieved the goal of 30-50 lbs(14-22 kg)weight ***-one patients(64%)underwent their intended elective surgery,2 patients(6%)deferred surgery due to symptom relief with weight loss ***-one of the patients(64%)have documented weights in 3 months after balloon removal,in these patients the majority(76%)gained weight after balloon *** pat

关键词： Intragastric balloon Weight loss Obesity Bariatric Body mass index

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