检索结果-南通市图书馆

Primary and Secondary Microplastic and Nanoplastic Regulations: Perspectives on Water Industry Impacts

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Protection 2024年第6期15卷 697-715页

作者： Shirin Estahbanati Giridhar Upadhyaya Martha J. M. wells Katherine Y. Bell brown and Caldwell New York NY USA brown and Caldwell Irvine CA USA EnviroChem Services Cookeville TN USA brown and Caldwell Nashville TN USA

Plastic pollution, both primary and secondary, is an environmental challenge, prompting regulatory actions at global and regional levels. With increasing research about the impacts of micro- and nanoplastics on ecosystems and human health, governments worldwide have undertaken efforts to address this issue. The global community has advanced regulatory efforts that have led to the implementation of national laws or regulations in numerous countries. These measures ban or restrict the use of primary and secondary microplastics and nanoplastics. An overview of global and European regulatory frameworks is presented to provide context for the United States (US). In the endeavor to document plastics regulation development in the US, a description of regulatory agencies and their roles in advancing policy and rules as well as future direction and areas for improvement in regulating plastics are introduced. A discussion of what emerging regulations mean to utilities and industries is also provided along with a comparison of regulatory frameworks.

关键词： Microplastic Regulation Environmental Governance Plastic Pollution Mitigation Regulatory Framework

Considerations for the use of porcine organ donation models in preclinical organ donor intervention research

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Animal Models and Experimental Medicine 2024年第3期7卷 283-296页

作者： Frazer I.Heinis Shaheed Merani Nicholas W.Markin Kim F.Duncan Michael J.Moulton Lance Fristoe William E.Thorell Raechel A.Sherrick Tami R.wells Matthew T.Andrews Marian Urban School of Natural Resources Institute of Agriculture and Natural ResourcesUniversity of Nebraska-LincolnLincolnNebraskaUSA Division of Transplantation and Vascular Surgery Department of SurgeryUniversity of Nebraska Medical CenterOmahaNebraskaUSA Department of Anesthesiology University of Nebraska Medical CenterOmahaNebraskaUSA Division of Cardiothoracic Surgery Department of SurgeryUniversity of Nebraska Medical CenterOmahaNebraskaUSA Clinical Perfusion Nebraska Medicine-Nebraska Medical CenterOmahaNebraskaUSA Department of Neurosurgery University of Nebraska Medical CenterOmahaNebraskaUSA Nutrition and Health Sciences College of Education and Human SciencesUniversity of Nebraska-LincolnLincolnNebraskaUSA Department of Comparative Medicine University of Nebraska Medical CenterOmahaNebraskaUSA

Use of animal models in preclinical transplant research is essential to the optimization of human allografts for clinical *** models of organ donation and preservation help to advance and improve technical elements of solid organ recovery and facilitate research of ischemia-reperfusion injury,organ preservation strategies,and future donor-based *** considerations include cost,public opinion regarding the conduct of animal research,translational value,and relevance of the animal model for clinical *** present an overview of two porcine models of organ donation:donation following brain death(DBD)and donation following circulatory death(DCD).The cardiovascular anatomy and physiology of pigs closely resembles those of humans,making this species the most appropriate for pre-clinical *** are also considered a potential source of organs for human heart and kidney *** is imperative to minimize animal loss during procedures that are surgically *** present our experience with these models and describe in detail the use cases,procedural approach,challenges,alternatives,and limitations of each model.

关键词： animal model brain death circulatory death organ transplantation

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

现在是投资比特币的好时机吗?

商业周刊（中文版） 2024年第4期 27-28页

作者： Charlie wells 孟洁冰(译) 不详

●最近的加密货币反弹行情让理财顾问对比特币有了新的看法无论你是喜欢、讨厌还是长期持有它,不可否认的是,比特币又回来了。在经历了一系列丑闻、破产和价格下跌近77%的“加密货币寒冬”之后,3月11日,比特币首次突破72000美元大关,这... 详细信息

●最近的加密货币反弹行情让理财顾问对比特币有了新的看法无论你是喜欢、讨厌还是长期持有它,不可否认的是,比特币又回来了。在经历了一系列丑闻、破产和价格下跌近77%的“加密货币寒冬”之后,3月11日,比特币首次突破72000美元大关,这一升提振了其他加密货币的行情,以太币甚至狗狗币的价值也随之上涨。

关键词：比特币价格下跌理财顾问加密货币狗狗币行情

Methanol oxidation over shell-core MOx/Fe2O3（M = Mo, V, Nb） catalysts

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2019年第11期40卷 1686-1692页

作者： Pip Hellier Peter P. wells Michael Bowker UK Catalysis Hub Research Complex at Harwell Rutherford Appleton Laboratory Harwell UK School of Chemistry Cardiff University Cardiff UK School of Chemistry University of Southampton Southampton UK Diamond Light Source Ltd Harwell Science and Innovation Campus Didcot UK

We present a comparison of Mo, V and Nb oxides as shell materials atop haematite cores used for selective methanol oxidation. While Mo and V both yield high selectivity to formaldehyde, Nb does not. Very different reactivity patterns are seen for Nb, which mainly shows dehydrogenation (to CO) and dehydration (to DME), indicating the lack of a complete shell, while Raman spectroscopy shows that the Mo and V formation process is not followed by NbOx. We suggest this is due to the large differences in mobility within the solid materials during formation, NbOx requiring significantly higher (and deleterious) calcination temperatures to allow sufficient mobility for shell completion.

关键词： Methanol Oxidation Formaldehyde Iron molybdate Shell-core catalyst

维普期刊数据库

The “PAWPER-on-a-page”: Increasing global access to a low-cost weight estimation system

在线全文

学校读者我要写书评

暂无评论

World Journal of Emergency Medicine 2019年第2期10卷 101-108页

作者： Mike wells Lara Nicole Goldstein Division of Emergency Medicine Faculty of Health Sciences University of the Witwatersrand

BACKGROUND: The PAWPER tape is one of the most accurate weight estimation systems available today, but international access to the tape is limited because it has no commercial distribution. For this reason, the "PAWPER-on-a-page" concept was devised: downloadable image fi les that allow users to print and assemble their own tapes. However, the feasibility of this method is dependent on users being able to produce accurate tapes. This study was devised to determine whether untrained participants could print and assemble the "PAWPER-on-a-page" easily and ***: Doctor and nurse volunteers downloaded the "PAWPER-on-a-page" and "PAWPER XL-on-a-page" image files and printed copies on a home-printer and also at a commercial printer. One copy of each tape was then assembled according to instructions from an online video. The accuracy of printing and assembly, the time taken for assembly and the cost were then ***: There were 32 participants. The median time for assembly was 8 minutes 19 seconds and 7 minutes 31 seconds for the "PAWPER-on-a-page" and "PAWPER XL-on-a-page" respectively, with a median cost of USD 0.09 and USD 1.00 respectively. For the assembled tapes, 71.9% of the "PAWPER-on-a-page" tapes and 65.6% of the "PAWPER XL-on-a-page" achieved the required accuracy of 0.2%. Printing errors, related to scaling, were common, but easily ***: The "PAWPER-on-a-page" system can be easily, quickly, affordably and accurately printed and assembled by end users. Stringent double checking of the printed and fully assembled tapes is essential to ensure accuracy.

关键词： PAWPER tape Weight estimation Paediatric emergency care

维普期刊数据库

Interfacial Strategies for Smart Slippery Surfaces

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2020年第4期17卷 633-643页

作者： Glen McHale Rodrigo Ledesma-Aguilar Gary George wells Smart Materials&Surfaces Laboratory Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle upon TyneNE18STUK

The problem of contact line pinning on surfaces is pervasive and contributes to problems from ring stains to ice *** we provide a single conceptual framework for interfacial strategies encompassing five strategies for modifying the solid-liquid interface to remove pinning and increase droplet *** biomimetic strategies are included,(i)reducing the liquid-solid interfacial area inspired by the Lotus effect,(ii)converting the liquid-solid contact to a solid-solid contact by the formation of a liquid marble inspired by how galling aphids remove honeydew,and(iii)converting the liquid-solid interface to a liquid-lubricant contact by the use of a lubricant impregnated surface inspired by the Nepenthes Pitcher *** further strategies are,(iv)converting the liquid-solid contact to a liquid-vapor contact by using the Leidenfrost effect,and(v)converting the contact to a liquid-liquid-like contact using slippery omniphobic covalent attachment of a liquid-like coating(SOCAL).Using these approaches,we explain how surfaces can be designed to have smart functionality whilst retaining the mobility of contact lines and ***,we show how droplets can evaporate at constant contact angle,be positioned using a Cheerios effect,transported by boundary reconfiguration in an energy invariant manner,and drive the rotation of solid components in a Leidenfrost heat *** conceptual framework enables the rationale design of surfaces which are slippery to liquids and is relevant to a diverse range of applications.

关键词： superhydrophobicity SLIPS liquid marbles leidenfrost SOCAL

Keap1 eye on the target:chemoprevention of liver cancer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Pharmacologica Sinica 2007年第9期28卷 1331-1342页

作者： Melinda Sue YATES Thomas wells KENSLER Department of Pharmacology and Molecular Sciences Johns Hopkins School of Medicine Department of Pharmacology and Molecular Sciences Johns Hopkins School of Medicine and Department of Environmental Health SciencesJohns Hopkins Bloomberg School of Public HealthBaltimoreMaryland 21205USA

Hepatocellular carcinoma (HCC) is one of the most common cancers worldwide,causing nearly 600 000 deaths each *** risk of HCC due to chronicinfection with hepatitis B virus (HBV) and exposure to dietary aflatoxins is respon-sible for many of these *** strategies targeting HBV infection andaflatoxin exposure could dramatically impact the rates of *** HBVvaccination programs have begun in some high-risk *** to reduceaflatoxin contamination in food stores have also been ***,complete elimination of aflatoxin contamination might not be *** thisreason,chemoprevention strategies which alter aflatoxin disposition are a practi-cal strategy to reduce the incidence of HCC in populations with high dietaryaflatoxin *** mechanisms of aflatoxin-induced hepatocarcinogenesisare well *** knowledge provides the basis for evaluation of both expo-sures to aflatoxin,as well as modulation of aflatoxin disposition by *** of aflatoxin DNA damage and toxicity as well as other metabo-lites can be used as biomarkers to evaluate modulation of aflatoxin *** of aflatoxin disposition can be achieved through induction of conju-gating and cytoprotective *** of these enzymes are regulated throughKelch ECH-associating protein 1 (Keap1)-NF-E2-related factor 2(Nrf2)-antioxi-dant response element (ARE) signaling,making this pathway an important mo-lecular target for *** studies have identified several classesof chemopreventive agents which induce cytoprotective *** inducersinclude phenolic antioxidants,dithiolethiones,isothiocyanates,and ***,clinical interventions have shown that inducers of Keap 1-Nrf2-ARE signaling increase cytoprotective enzyme expression,resulting in modula-tion of aflatoxin *** work remains to be done in order to takepromising chemopreventive agents from preclinical evaluation to

关键词： chemoprevention Kelch ECH associating protein 1 Nrf2 sulforaphane oltipraz triterpenoids dithiolethiones hepatocellular carcinoma

Analysis of the hot deformation of ZK60 magnesium alloy

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2017年第4期5卷 369-387页

作者： Amir Hadadzadeh Mary A.wells Mechanical and Mechatronics Engineering Department University of WaterlooWaterlooON N2L 3G1Canada

Hot deformation of cast-homogenized and extruded(in both the extrusion and transverse directions)ZK60 magnesium alloy was conducted using the Gleeble®3500 thermal-mechanical simulation testing system.A new approach to model the high temperature constitutive behavior of the alloy was done using two well-known equations(*** sine and Ludwig equations).For this approach,the deformation conditions were divided into regimes of low and high temperature and strain rate(four regimes).Constitutive model development was conducted in each regime and the material parameters(P)were evaluated as strain,strain rate and temperature-dependent variables;P(ε,ε,T).Using this approach,the flow curves were predicted with high accuracy relative to the experimental ***,detailed information on the evolution of hot deformation activation energy was obtained using the modified hyperbolic sine *** the modified Ludwig equation,details of strain hardening and strain rate sensitivity of the ZK60 material during hot deformation were obtained.

关键词： ZK60 magnesium alloy Hot deformation Constitutive modeling Zener-Hollomon Hyperbolic sine Ludwig equation

Challenging the assumption about a direct relationship between historic preservation and architecture in the United States

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Architectural Research 2018年第4期7卷 455-464页

作者： Jeremy C.wells School of Architecture Planning and PreservationUniversity of MarylandMD 20742United States

A close relationship is assumed to exist between historic preservation and architectural practice. This study explores the nature of this relationship by using evidence from scholarly literature, the job market, and architectural education. The examined literature contains many examples showing that the architecture field views historic preservation as an external interest. Evidence from the job market indicates that architecture employers are uninterested in historic preservation skills, and historic preservation employers are not looking for architecture skills. Architecture schools and accrediting organizations either disregard historic preservation or minimize its importance. Moreover, historic preservation is more closely related to environmental and behavioral studies than it is to the architectural field. The relationship between architecture and historic preservation is tenuous, strained, and based more on stereotypes than on actual evidence.

关键词： Historic preservation Architecture Heritage conservation Education Job market Employers