Ahmed Alshehri

Followers

Following

Public Views

Vivian Lin

La Trobe University

Sarah S Willen

University of Connecticut

Peggy Leatt

University of North Carolina at Chapel Hill

Viacheslav Kuleshov

Stockholm University

Andrea Pendezzini

Università degli Studi di Bergamo (University of Bergamo)

Carole Estabrooks

University of Alberta

Habtamu Gebrehana

University of Gondar

Garumma T Feyissa

Drexel University

David Grembowski

University of Washington

Dragos Simandan

Brock University

Interests

Uploads

Papers by Ahmed Alshehri

Plasmonic hybrid platinum-titania nanocomposites as highly active photocatalysts: self-cleaning of cotton fiber under solar light

Journal of Materials Research and Technology

Abstract In the present paper, a one-step, simple, efficient and low-cost strategy was demonstrat... more Abstract In the present paper, a one-step, simple, efficient and low-cost strategy was demonstrated for preparing of highly stable hybrid platinum-titania (Pt@TiO2) photocatalyst by solvothermal wet chemical process. Platinum (Pt) in the metallic form combined with titania (TiO2) in the crystallographic anatase form has been manufactured using Dimethyl Sulfoxide (DMSO) as a solvent and surfactant using titanium (IV) butoxide and hydrogen hexachloroplatinate(IV) precursors. Full characterization of the hybrid nanomaterials including their morphology, crystalline structure and optical properties was determinate using different experimental techniques such as XRD, TEM and UV–vis spectroscopy. TEM images showed spherically shaped Pt nanoparticles (NPs) of the diameter 5–10 nm with good particle size distribution. The EDXRF data revealed that Pt NPs are in metallic form. Optical investigation show that Pt@TiO2 NPs exhibits a good optical response under UV–vis light excitation compared to bare-TiO2. Furthermore, photocatalytic investigation of Pt@TiO2 colloids photocatalyst towards the photodegradation of diuron, as a model organic pesticide was reported. The hybrid Pt@TiO2 photocatalyst prove high-performance on the photodecomposition of the pesticide under solar light within only 60 min. In the other hand, the plasmonic hybrid Pt@TiO2 was incorporated into the cotton fabric to attain a modified fiber with high self-cleaning activity.

Health Financing in Guatemala: A Situation Analysis and Lessons from Four Developing Countries Final Report

1. Introduction This paper has two main goals. The first is to provide a broad overview of the he... more 1. Introduction This paper has two main goals. The first is to provide a broad overview of the health care financing and provision system in Guatemala and in so doing, highlight some of the major challenges related to health financing that it faces. The second goal is to examine four developing country case studies that have addressed health financing issues similar to Guatemala and draw out lessons from their experiences for Guatemalan policymakers as they proceed to address their health policy goals. In line with these objectives, the following section outlines the Guatemalan health care system including health services provided, the different entities involved in providing these services, the mechanisms by which health services are financed and the most recent figures on health sector financing. In section 3, we use data from the living standards measurement surveys (LSMS) 2000 and 2006 to generate additional supporting evidence for some of this descriptive analysis, and to highlight several challenge areas for Guatemala. These challenge areas include the inadequate health insurance coverage for its population, the equity (or lack thereof) of this coverage and the use of health system resources, the inefficiency with which health care is provided in Guatemala and the costs of health care. This section provides descriptive information on insurance coverage in Guatemala in the general population and among urban and rural populations, health care spending on outpatient care as well as overall health care spending for different income quintiles, an analysis of health spending and poverty ratios, heath spending and financial risk, and estimates of labor lost due to illness. In section 4 we discuss four country cases – China, Colombia, India and Mexico, respectively – that have faced problems similar to Guatemala and have sought to devise innovative financing and payment mechanisms to address the health care and financial risk protection needs of their rural populations and those working in the informal sector. The case studies offer real world examples and are intended to illustrate some of the more interesting options available for consideration in the Guatemalan context. Section 5 concludes. The paper also includes a technical appendix that discusses some of the major financing mechanisms along with their pros and cons to help guide the reader as they read through the case studies. We note specifically that these are not typically to be viewed as " either/or " options but instead as possible policy tools that work well in certain circumstance and not in others; and sometimes in combination. Nor are these tools to be implemented in isolation from other policy steps related to regulation, the organization of provision, and payment mechanisms.

Download