检索结果-南通市图书馆

Journal of Environmental Sciences 2010年第9期22卷 1462-1468页

作者： edward d.ramsey School of Chemical Engineering University of Science and Technology Liaoning

A direct aqueous supercritical fluid extraction （SFE） system using carbon dioxide provides a sustainable means by which a vast range of industries may continue to depend on well established infrared （IR） techniques to determine oil-in-water. The SFE-IR method provides an environmentally friendly substitute for current national standard IR reference methods for measuring oil-in-water that rely on using increasingly restricted ozone depleting solvents whose manufacture is being phased out in accordance with international law. The SFE-IR analysis of a 500 mL water sample can be accomplished in 15 min. A rapid on-line SFE-IR calibration method has been implemented. With this calibration method, SFE-IR accuracy for determining diesel oil in 500 mL spiked water samples using single wave number measurement was 86.0%-98.8% with precision （RSd） ranging from 2.5%-7.0%. Using a general purpose calculation which involves measuring infrared absorbance values at three different wave numbers, SFE-IR method accuracy for determining diesel oil in 500 mL spiked water samples was 83.7%-92.2% with RSd 1.0%-9.3%. data is presented that indicates current long established national standard IR reference methods involving three wave number calculations should be reviewed since, without careful consideration, the inclusion of calculated aromatic hydrocarbon species contributions to final oil-in-water concentration values may provide less accurate results.

关键词： oil-in-water supercritical fluid extraction infrared spectroscopy sustainable green technology

Mini-Review:Green sustainable processes using supercritical fluid carbon dioxide

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2009年第6期21卷 720-726页

作者： ramsey edward University of Science and Technology Liaoning

Environmentally benign carbon dioxide offers significant potential in its supercritical fluid phase to replace current reliance on a range of hazardous, relatively expensive and environmentally damaging organic solvents that are used on an extensive global basis. The unique combination of the physical properties of supercritical fluids are being exploited and further researched to continue the development and establishment of high efficiency, compact plant to provide energy and water efficient manufacturing processes. This mini-review is focused on the use and potential applications of supercritical fluid carbon dioxide for a selected range of key and emerging industrial processes as a sustainable alternative to totally eliminate or greatly reduce the requirement of numerous conventional organic solvents. Examples of the industries include： chemical extraction and purification, synthetic chemical reactions including polymerization and inorganic catalytic processes. Biochemical reactions involving enzymes, particle size engineering, textile dyeing and advanced material manufacture provide further illustrations of vital industrial activities where supercritical fluid technology processes are being implemented or developed. Some aspects relating to the economics of sustainable supercritical fluid carbon dioxide processes are also considered.

关键词： supercritical extraction synthesis catalysis enzymes polymerization particles dyeing

Cardiovascular disease and male sexual dysfunction

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2015年第1期17卷 3-4,I0006页

作者： Martin Miner edward d Kim Miriam Hospital Men's Health Center Warren Alpert School of Medicine Brown University Providence RI USA department of Surgery Division of Urology University of Tennessee Graduate School of Medicine Knoxville Tennessee 37920 USA

Erectile dysfunction （Ed） is a form of sexual dysfunction that is estimated to affect 〉 30% of men between the ages of 40 and 70. As a result of an improved understanding about the pathophysiology of Ed and improved treatment options, an increasing number of men are presenting for evaluation than several decades ago. In fact, many of these men are visiting their health care professional for the first time with Ed as their primary complaint. Most of these men are unaware of the link between Ed and cardiovascular disease （CVd）.

关键词：性功能障碍心血管疾病男性勃起功能障碍病理生理医疗保健 CVd

Azoospermia:vasal agenesis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2022年第1期24卷 1-4页

作者： J Sam Fisher edward d Kim department of Urology University of TennesseeKnoxvilleTN 37920USA

SPECIFIC GENETIC TESTS(CFTR ANd INTRON 8 SPLICE VARIANT TESTING)ANd THEIR SIGNIFICANCE Congenital bilateral absence of the vas deferens(CBAVd)and cystic fibrosis(CF)began as separate entities with an apparent clinical *** occurs in 1%–2%of men presenting with infertility at urological departments and has an incidence of 1:1000–1:2000 in Caucasian *** example of this anatomic variant is shown in Figure 1.

关键词： correlation. clinical Figure

The efforts are worth the benefits for laparoscopic liver resection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hepatobiliary Surgery and Nutrition 2023年第5期12卷 813-814页

作者： edward Willems Mathieu d’Hondt department of digestive and Hepatobiliary/Pancreatic Surgery Groeninge HospitalKortrijkBelgium

Last year,Hepatobiliary Surgery and Nutrition published an interesting analysis performed by Ratti and colleagues(1).This study aimed to understand if the efforts associated with the laparoscopic approach in liver surgery are always worthwhile,specifically in high-complexity *** endpoint was to analyse the degree of benefit of laparoscopy over open liver surgery(OLS)in different levels of technical *** endpoint was to confirm that advantages of minimally invasive techniques over open are detectable within all levels of complexity.

关键词： Laparoscopic liver surgery(LLS) minimally invasive liver surgery learning curve differential benefit

The significance of clinical practice guidelines on adult varicocele detection and management

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2016年第2期18卷 269-275,J0006,J0007页

作者： Anand Shridharani Ryan C Owen Osama O Elkelany edward d Kim department of Urology University of Tennessee College of Medicine Chattanooga TN 37403 USA division of Urology Department of Surgery University of Tennessee Graduate School of Medicine Knoxville TN 37920 USA.

Varicoceles are the most common correctable etiology of male factor infertility. However, the detection and management of varicoceles have not been standardized. This has led to decades of debate regarding the effect of varicocele on male infertility and subsequently whether repair leads to an improved fertility status. The current body of evidence investigating the role of varicocele and varicocelectomy is weak and conflicting. The stance taken by the AUA and ASRM suggests that there is insufficient outcomes data to support evidenced-based guidelines, citing evidence used to provide current recommendations are generally of a low quality level. On the other hand, the EAU Guidelines give a level la of evidence for management of varicoceles that are clinically palpable, associated with subnormal semen analyses and having otherwise unexplained fertility. Besides aiding with clinical varicocele detection and management, clinical practice opinion statements and guidelines aim to direct and strengthen the infrastructure of future studies. We review the current status of opinion statements and guidelines in varicocele and management detection with focus on their application in practice.

关键词： guidelines varicocele varicocele detection varicocele management varicocelectomy

Endovascular treatment of vasculogenic erectile dysfunction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2015年第1期17卷 40-43,I0007页

作者： edward d Kim Ryan C Owen Gregory S White Osama O Elkelany Cyrus d Rahnema University of Tennessee Graduate School of Medicine Knoxville TN USA.

The treatment of erectile dysfunction （Ed） has been a fascination involving multiple medical specialities over the past century with urologic, cardiac and surgical experts all contributing knowledge toward this multifactorial disease. With the well-described association between Ed and cardiovascular disease, angiography has been utilized to identify vasculogenic impotence. Given the success of endovascular drug-eluting stent （dES） placement for the treatment of coronary artery disease, there has been interest in using this same technology for the treatment of vasculogenic Ed. For men with inflow stenosis, dES placement to bypass arterial lesions has recently been reported with a high technical success rate. Comparatively, endovascular embolization as an approach to correct veno-occlusive dysfunction has produced astonishing procedural success rates as well. However, after a thorough literature review, arterial intervention is only recommended for younger patients with isolated vascular injuries, typically from previous traumatic experiences. Short-term functional outcomes are less than optimal with long-term results yet to be determined. In conclusion, the hope for a minimally invasive approach to Ed persists but additional investigation is required prior to universal endorsement.

关键词： erectile dysfunction impotence penile erection vasculogenic

debris flow impact on flexible barrier: effects of debrisbarrier stiffness and flow aspect ratio

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 Mountain Science 2019年第7期16卷 1629-1645页

作者： SONG dong-ri ZHOU Gordon G.d CHOI Clarence edward ZHENG Yun Key Laboratory of Mountain Hazards and Earth Surface Process/Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China University of Chinese Academy of Sciences Beijing 100049China department of Civil and Environmental Engineering Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong SARChina The HKUST Jockey Club Institute for Advanced Study Hong Kong SARChina

Conventionally,flexible barriers are rated based on their ability to resist a free-falling boulder with a particular input ***,there is still no well-accepted approach for evaluating performance of flexible barrier under debris flow *** this study,a large-nonlinear finite-element model was used to back-analyze centrifuge tests to discern the effects of impact material type,barrier stiffness,and flow aspect ratio(flow height to flow length)on the reaction force between the impacting medium and flexible *** show that,in contrast to flexible barriers for resisting rockfall,the normal impact force induced by the highly frictional and viscous debris is insensitive to barrier *** is because the elongated distributions of kinetic energy are mainly dissipated by the internal and boundary shearing,and only a small portion is forwarded to the ***,a new stiffness number is proposed to characterize the equivalent stiffness between a debris flow or a boulder,and a flexible *** the circumstance of an extremely elongated debris flow event,i.e.,low aspect ratio,the load on a barrier is dominated by the static component and thus not sensitive to the barrier stiffness.

关键词： debris flow Flexible barrier Impact Stiffness Flow aspect ratio

Modelling the potential consequences of adaptive closure management in a penaeid trawl fishery

在线全文

学校读者我要写书评

暂无评论

Aquaculture and Fisheries 2023年第2期8卷 190-201页

作者： edward V.Camp daniel d.Johnson Matthew d.Taylor Fisheries and Aquatic Sciences School of ForestFisheriesand Geomatics SciencesUniversity of FloridaGainesville32611FLUSA Port Stephens Fisheries Institute New South Wales Department of Primary IndustriesTaylors Beach RdTaylors BeachNew South Wales2315Australia School of Environmental and Life Sciences University of NewcastleNew South Wales2308Australia

Spatial management of fishing effort can be used to avoid catching undesirable size classes for target species,and improve yield-per-recruit for the exploited *** closure management has been proposed as a means to more effectively utilise spatial management,however these management provisions often lack quantitative evaluation which constrains the information available to inform *** demonstrate the use of a spatially and size structured population dynamics model to evaluate the potential impact of spatial management on a multijurisdictional fishery for a highly migratory species(eastern king prawn,Penaeus[Melicertus]plebejus).Under current conditions in the fishery,the overall effect of closures on harvest was estimated to be comparatively minor,regardless of assumptions about how effort or fisher behavior are affected by spatial *** assumptions about the movement patterns of eastern king prawn had little influence on the impact of closures on overall ***,when effort was increased to historic levels similar to those observed when the closures were implemented,a much greater impact on overall harvest was *** approach taken and simulation outcomes are discussed in the context of spatial management for both eastern king prawn,and penaeid fisheries more broadly.

关键词： Penaeidae Trawl Management strategy evaluation Closures Adaptive management

Visualization of atomic scale reaction dynamics of supported nanocatalysts during oxidation and ammonia synthesis using in-situ environmental(scanning) transmission electron microscopy

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 Energy Chemistry 2021年第6期30卷 281-290,I0007页

作者： Michael R.Ward Robert W.Mitchell edward d.Boyes Pratibha L.Gai The York Nanocentre University of YorkYork YO105DDUK department of Physics University of YorkYork YO105DDUK department of Electronic Engineering University of YorkYork YO105DDUK department of Chemistry University of YorkYork YO105DDUK

Reaction dynamics in gases at operating temperatures at the atomic level are the basis of heterogeneous gas-solid catalyst reactions and are crucial to the catalyst *** noble metal nanocatalysts such as platinum are of interest in fuel cells and as diesel oxidation catalysts for pollution control,and practical ruthenium nanocatalysts are explored for ammonia *** and graphitic carbons are of interest as supports for the *** considerable literature on the catalytic processes on graphite and graphitic supports,reaction dynamics of the nanocatalysts on the supports in different reactive gas environments and operating temperatures at the single atom level are not well *** we present real time in-situ observations and analyses of reaction dynamics of Pt in oxidation,and practical Ru nanocatalysts in ammonia synthesis,on graphite and related supports under controlled reaction environments using a novel in-situ environmental(scanning) transmission electron microscope with single atom *** recording snapshots of the reaction dynamics,the behaviour of the catalysts is *** images reveal single metal atoms,clusters of a few atoms on the graphitic supports and the support *** all play key roles in the mobility,sintering and growth of the *** experimental findings provide new structural insights into atomic scale reaction dynamics,morphology and stability of the nanocatalysts.

关键词： In-situ visualization Atomic scale reaction dynamics In-situ environmental scanning transmission electron microscopy with single atom resolution Supported nanoparticles Ammonia synthesis Oxidation reactions