A Study of the Influence of Water on Polyethylene Glycol Solutions PDF Download
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Author: Melanie L. Moody
Publisher:
ISBN:
Category :
Languages : en
Pages : 314
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Author: Melanie L. Moody
Publisher:
ISBN:
Category :
Languages : en
Pages : 314
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Book Description
Author: Purdue Research Foun
Publisher: CRC Press
ISBN: 9781575040226
Category : Technology & Engineering
Languages : en
Pages : 872
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Book Description
Proceedings of the 50th Industrial Waste Conference is the only comprehensive documentation of the entire seminar. It is an overview of the current state of hazardous waste identification, management and disposal.
Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 1198
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Author: Mohamed Mouzali
Publisher:
ISBN:
Category : Cooling power
Languages : en
Pages : 14
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Book Description
Solutions of high molecular weight polymers are used widely in the heat treatment of metal alloys known as quenching. Water-soluble polymers offer a number of environmental, economic, and technical advantages, including eliminating the quench-oil fire hazard. The cooling power of water-soluble polymers such as polyethylene glycol (PEG) and salts aqueous solutions is studied with a cylindrical test probe of Inconel 600 by using a quenchometer. The dependences of the cooling rates, at each bath temperature, on polymer concentration and agitation are established. The present paper describes, through an understanding of the quenching mechanism, the effect that some parameters concerning the control of polymer quenchants have on their behavior. The effect of the salts on the quenching characteristics has also been studied. A study has been made of the relationship between the concentration of PEG, bath temperature, agitation, and cooling power in aqueous quenchants that contain up to 20 % of PEG. The presence of 5 % or less of the polymer in solution increased the cooling power of the quench in comparison with the water quenchant. However, increasing polymer concentration will decrease the cooling power as well as the maximum cooling rate because of the formation of the vapor blanket in the first phase of the quenching mechanism. The hardening power (HP) of the PEG quenchant solution was characterized on the cooling curve by the two critical points, CRF (the cooling rate at the ferrite/pearlite nose) and CRM (the cooling rate at the martensite start transformation), using an empirical relation giving HP in function of the measured polymer quenchant cooling characteristics. The highest HP was obtained in dilute solution of PEG having a concentration of 2.5 %, which reaches a value of 2051 at 20°C and 1951 at 45°C, under agitation.
Author: Paul W. Ackermann
Publisher: Springer
ISBN: 3319339435
Category : Medical
Languages : en
Pages : 299
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Book Description
This book will be of considerable interest to students, practitioners (Doctors, Physiotherapists, and other health care professionals), and researchers who deal with the complex structure of tendons and the need to effectively address tendon disorders. The book is divided into three sections: (1) Basic Biology and Biochemical Markers; (2) Metabolic Disorders; and (3) Novel Therapies. The first section, devoted to the basic biology of tendons, is aimed at those individuals who want to gain basic information on tendons and the subsection on biochemical markers is chiefly aimed at researchers who are developing new studies within this field. The section on metabolic disorders is mainly directed at practitioners who desire to know how metabolic disorders can affect tendons in order to optimize treatment for their patients. Finally, the section on novel therapies is focused on some new treatment options within this field, and discussions regarding how management of tendon disorders needs to incorporate perspectives on current understanding of tendon metabolism.
Author: A.L. Smit
Publisher: Springer Science & Business Media
ISBN: 9783540667285
Category : Science
Languages : en
Pages : 612
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Book Description
A comprehensive review of all modern methods for plant root research, both in the field and in the laboratory. It covers the effects of environmental interactions with root growth and function, focussing in particular on the assessment of root distribution and dynamics. It also describes and discusses the processing of root observations, analysis and modelling of root growth and architecture, root-image analysis, computer-assisted tomography and magnetic resonance imaging. Furthermore, a survey of the application of isotope techniques in root physiology is given.
Author:
Publisher:
ISBN:
Category : Solution (Chemistry)
Languages : en
Pages : 648
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Book Description
Author: Ron Liu
Publisher: CRC Press
ISBN: 1351646826
Category : Medical
Languages : en
Pages : 781
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Book Description
Properties and Formulation: From Theory to Real-World Application Scientists have attributed more than 40 percent of the failures in new drug development to poor biopharmaceutical properties, particularly water insolubility. Issues surrounding water insolubility can postpone or completely derail important new drug development. Even the much-needed reformulation of currently marketed products can be significantly affected by these challenges. More recently it was reported that the percentage increased to 90% for the candidates of new chemical entities in the discovery stage and 75% for compounds under development. In the most comprehensive resource on the topic, this third edition of Water-Insoluble Drug Formulation brings together a distinguished team of experts to provide the scientific background and step-by-step guidance needed to deal with solubility issues in drug development. Twenty-three chapters systematically describe the detailed discussion on solubility theories, solubility prediction models, the aspects of preformulation, biopharmaceutics, pharmacokinetics, regulatory, and discovery support of water-insoluble drugs to various techniques used in developing delivery systems for water-insoluble drugs. This book includes more than 15 water-insoluble drug delivery systems or technologies, illustrated with case studies and featuring oral and parenteral applications. Highlighting the most current information and data available, this seminal volume reflects the significant progress that has been made in nearly all aspects of this field. The aim of this book is to provide a handy reference for pharmaceutical scientists in the handling of formulation issues related to water-insoluble drugs. In addition, this book may be useful to pharmacy and chemistry undergraduate students and pharmaceutical and biopharmaceutical graduate students to enhance their knowledge in the techniques of drug solubilization and dissolution enhancement.
Author: Thomas Leustek
Publisher:
ISBN:
Category : Plant-water relationships
Languages : en
Pages : 228
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Book Description
Author:
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 1212
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Book Description
