This page shows you your search results in order of relevance. This is page number 17.
Order by Relevance | Date
Total 514633 results found since Jan 2013.
Teaching mathematical modeling software for multiobjective optimization in chemical engineering courses
Publication date: December 2012 Source:Education for Chemical Engineers, Volume 7, Issue 4 Author(s): Norberto García , Rubén Ruiz-Femenia , José A. Caballero This paper expects to give undergraduate students some guidelines about how to incorporate environmental considerations in a chemical supply chain and how the introduction of these concerns have an important effect on the results obtained in the multiobjective optimization problem where both economic and environmental aspects are considered simultaneously. To extend the economic and environmental assessment outside the chemical plant and to identify the tradeoff...
Source: Education for Chemical Engineers - October 12, 2014 Category: Chemistry Source Type: research
How to implement environmental considerations in chemical process design: An approach to multiobjective optimization for undergraduate students
Publication date: May 2012 Source:Education for Chemical Engineers, Volume 7, Issue 2 Author(s): Norberto García , José A. Caballero This paper expects to give some guidelines for undergraduate students about how to implement environmental considerations in chemical process design and how the introduction of these issues could have an important effect on the results obtained in the multiobjective problem optimization when economic and environmental aspects are considered simultaneously. For this work, a representative flowsheet of many chemical and petrochemical processes has been considered. This processing scheme wor...
Source: Education for Chemical Engineers - October 12, 2014 Category: Chemistry Source Type: research
Assessment of chemical management practices and safety in junior secondary school laboratories in Gaborone
This study was aimed at assessing chemical management practices and safety in junior secondary school laboratories. A likert survey was developed and administered to 30 participants from 10 randomly sampled junior secondary schools in Gaborone. Data analysis was done using Statistical Package for Social Sciences (SPSS) to compute frequencies, percentages, mean and standard deviation. The findings show that there is lack of knowledge and awareness on sound chemical management as shown by low frequency of 1.58. Low frequencies of mean range of 1.85–2.38 indicated that there is poor record keeping and poor inventory managem...
Source: Journal of Chemical Health and Safety - January 16, 2015 Category: Chemistry Source Type: research
Chemical ligation methods for the tagging of DNA-encoded chemical libraries.
Abstract
The generation of DNA-encoded chemical libraries requires the unimolecular association of multiple encoding oligonucleotides with encoded chemical entities during combinatorial synthesis processes. This has traditionally been achieved using enzymatic ligation. We discuss a range of chemical ligation methods that provide alternatives to enzymatic ligation. These chemical ligation methods include the generation of modified internucleotide linkages that support polymerase translocation and other modified linkages that while not supporting the translocation of polymerases can also be used to generate individu...
Source: Current Opinion in Chemical Biology - March 7, 2015 Category: Biochemistry Authors: Keefe AD, Clark MA, Hupp CD, Litovchick A, Zhang Y Tags: Curr Opin Chem Biol Source Type: research
A Hard Nut to Crack: Reducing Chemical Migration in Food-Contact Materials
Nate Seltenrich covers science and the environment from Petaluma, CA. His work has appeared in High Country News, Sierra, Yale Environment 360, Earth Island Journal, and other regional and national publications.
Background image: © Joseph Tart/Brogan & Partners; Roy Scott
About This Article open
Citation: Seltenrich N. 2015. A hard nut to crack: reducing chemical migration in food-contact materials. Environ Health Perspect 123:A174–A179; http://dx.doi.org/10.1289/ehp.123-A174
News Topics: Bisphenol A (BPA), Chemical Testing, Endocrine Disruptors, Food Safety and Regulation, Green Chemistry, Industry Iss...
Source: EHP Research - July 1, 2015 Category: Environmental Health Authors: Web Admin Tags: Featured Focus News and Policy Bisphenol A (BPA) Chemical Testing Endocrine Disruptors Food Safety and Regulation Green Chemistry Industry Issues July 2015 Laws Plastics Regulations Source Type: research
Scoping biology-inspired chemical engineering
Publication date: Available online 15 July 2015 Source:Chinese Journal of Chemical Engineering Author(s): Xiao Dong Chen Biology is a rich source of great ideas that can inspire us to find successful ways to solve the challenging problems in engineering practices including those in the chemical industry. Bio-inspired chemical engineering (BioChE) may be recognized as a significant branch of chemical engineering. It may consist of, but not limited to, the following three aspects: 1) Chemical engineering principles and unit operations in biological systems; 2) Process engineering principles for producing existing or devel...
Source: Chinese Journal of Chemical Engineering - July 17, 2015 Category: Chemistry Source Type: research
Baseline survey on the implementation of laboratory chemical safety, health and security within health faculties laboratories at Universitas Indonesia
Publication date: Available online 2 December 2015 Source:Journal of Chemical Health and Safety Author(s): Fatma Lestari, Budiawan, Meily L. Kurniawidjaja, Budi Hartono Many chemical accidents occur in the laboratories including fire, toxic chemical spills, hazardous materials leakage, fatalities and adverse health effects involving the use of hazardous materials. This research investigates the implementation of Chemical Health, Safety and Security Program within the health faculties laboratories at Universitas Indonesia. The method used in this study employed a Chemical Health, Safety and Security Checklist develope...
Source: Journal of Chemical Health and Safety - December 3, 2015 Category: Chemistry Source Type: research
The Laboratory Safety Standard at 25: Implementation of the Standard through the Chemical Hygiene Plan and the Chemical Hygiene Officer – Is it trickling down?
We present results of a survey of institutional academic and industrial laboratory EHS professionals accessed through the DCHAS. We also present the results of a survey about PPE use at a research institution as a test of how to implement lab safety programs on the ground with engaged lab personnel, rather than issuing toothless policies. The survey was carried out among laboratory personnel at a research institution. The surveys are anonymous but the results but include responses from safety personnel in industry and academic research institutions and from researchers in medical research laboratories and employees in clinical laboratories.
Source: Journal of Chemical Health and Safety - February 3, 2016 Category: Chemistry Source Type: research
Computational Chemical Engineering – Towards thorough understanding and precise application
Publication date: Available online 11 May 2016 Source:Chinese Journal of Chemical Engineering Author(s): Zaisha Mao, Chao Yang The paradigms of chemical engineering discipline are discussed. The first paradigm of Unit Operations and the second paradigm of Transport Phenomena are well recognized among the chemical engineers all over the world, and what the next paradigm is remains still an open question. Several proposals such as chemical product engineering, sustainable chemical engineering and multi-scale methodology are considered as candidates for next paradigm. Might Computational Chemical Engineering be the next o...
Source: Chinese Journal of Chemical Engineering - May 10, 2016 Category: Chemistry Source Type: research
Setting up new Chemical Engineering degree programmes: Exercises in design and retrofit within constraints
Publication date: Available online 16 May 2016 Source:Education for Chemical Engineers Author(s): Grant M. Campbell, Daniel J. Belton The rise in popularity of chemical engineering among students entering university has prompted expansion of the UK provision, through increased intake into current degree programmes and with the rise of new providers. The former entails logistical challenges of processing larger numbers through existing infrastructures whilst maintaining the student experience. The latter entails challenges of designing and introducing programmes that build harmoniously on existing non-chemical engineeri...
Source: Education for Chemical Engineers - May 16, 2016 Category: Chemistry Source Type: research
Curly arrows meet electron density transfers in chemical reaction mechanisms: from electron localization function (ELF) analysis to valence-shell electron-pair repulsion (VSEPR) inspired interpretation.
Abstract
Probing the electron density transfers during a chemical reaction can provide important insights, making possible to understand and control chemical reactions. This aim has required extensions of the relationships between the traditional chemical concepts and the quantum mechanical ones. The present work examines the detailed chemical insights that have been generated through 100 years of work worldwide on G. N. Lewis's ground breaking paper on The Atom and the Molecule (Lewis, G. N. The Atom and the Molecule, J. Am. Chem. Soc. 1916, 38, 762-785), with a focus on how the determination of reaction mechanis...
Source: Chemical Communications - May 23, 2016 Category: Chemistry Authors: Andrés J, Berski S, Silvi B Tags: Chem Commun (Camb) Source Type: research
Chemical genetics approaches for selective intervention in epigenetics.
Abstract
Chemical genetics is the use of biologically active small molecules (chemical probes) to investigate the functions of gene products, through the modulation of protein activity. Recent years have seen significant progress in the application of chemical genetics to study epigenetics, following the development of new chemical probes, a growing appreciation of the role of epigenetics in disease and a recognition of the need and utility of high-quality, cell-active chemical probes. In this review, we single out the bromodomain reader domains as a prime example of both the success, and challenges facing chemica...
Source: Current Opinion in Chemical Biology - July 12, 2016 Category: Biochemistry Authors: Runcie AC, Chan KH, Zengerle M, Ciulli A Tags: Curr Opin Chem Biol Source Type: research
Quantitative phase analysis using observed integrated intensities and chemical composition data of individual crystalline phases: quantification of materials with indefinite chemical compositions
In a previous report, a new method for quantitative phase analysis (QPA) of multi-component mixtures using a conventional X-ray powder diffractometer was proposed. The formula for deriving weight fractions of individual crystalline phases presented therein includes sets of observed integrated intensities measured in a wide 2\theta range, chemical formula weights and sums of squared numbers of electrons belonging to atoms in respective chemical formula units [Toraya (2016). J. Appl. Cryst. 49, 1508 – 1516]. The latter two parameters required to perform QPA could be calculated from only the information of chemical formulae...
Source: Journal of Applied Crystallography - May 8, 2017 Category: Physics Authors: Toraya, H. Tags: X-ray powder diffraction quantitative phase analysis indefinite chemical composition unknown crystalline phases research papers Source Type: research
Survey of awareness about hazardous chemicals of residents living near chemical plants in South Korea.
This study aimed to investigate the awareness of the residents living near chemical plants about hazardous chemicals, as well as to survey the awareness of workers who do not directly handle chemicals at chemical plants (WNHCs). To this end, a questionnaire survey was conducted among a total of 600 residents and 160 WNHCs. The questionnaire was composed of three items: awareness of chemical risk, awareness of countermeasures in chemical accidents, and imperious necessity of PPE (personal protective equipment). Statistical analysis of the data was performed with the Statistical Package for Social Sciences (SPSS) version 18....
Source: Industrial Health - February 14, 2018 Category: Occupational Health Tags: Ind Health Source Type: research
Education of Chemical Engineering in Spain: A global picture
Publication date: Available online 19 June 2018 Source:Education for Chemical Engineers Author(s): Gumersindo Feijoo, Raquel Ibañez, Javier Herguido, Pedro Partal, Montserrat Tobajas, Julia Sèmpere, María Fernanda López-Pérez, María José Rivero-Martínez The general framework of the Chemical Engineering studies in Spain includes the Bachelor's Degree (4 years), Master's Degree (the most common duration is 1.5 years) and Doctorate (3-4 years). In 2008, the Conference of Directors and Deans of Chemical Engineering (CODDIQ) was constituted with the main objective of promoting and improving the quality of Chemical Engi...
Source: Education for Chemical Engineers - June 19, 2018 Category: Chemistry Source Type: research
