scholarly journals Direct Observation of Deformation in Microgel Filtration

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
John Linkhorst ◽  
Jonas Rabe ◽  
Lukas T. Hirschwald ◽  
Alexander J. C. Kuehne ◽  
Matthias Wessling
Keyword(s):  
Soft Matter ◽  
Filter Cake ◽  
Productivity Loss ◽  
Microfluidic Channel ◽  
Transmembrane Flux ◽  
Colloidal Matter ◽  
Realistic Description ◽  
On Line ◽  
The Individual ◽  
Crystalline Domains

AbstractColloidal filtration processes using porous membranes suffer from productivity loss due to colloidal matter retention and continuous build-up by the retained matter. Especially during filtration of soft matter, the deformation of the individual colloids that make up the filter cake may be significant; however, this deformation and its impact remain unresolved so far. Yet, understanding the deformation on the single colloid level as well as on the ensemble level is important to be able to deconvolute filter cake properties from resistance increase of the membrane either by simultaneous internal adsorption or blocking of pores. Here, we report on the compression of a filter cake by filtrating soft microgels in a microfluidic channel in front of a model membrane. To study the single colloid deformation amorphous and crystalline domains were built up in front of the membrane and visualized on-line using confocal fluorescence microscopy while adjusting the degree of permeation, i.e., the transmembrane flux. Results show locally pronounced asymmetric deformation in amorphous domains, while the microgels in colloidal crystals approached regular polyeder shape. Increasing the flux beyond the maximum colloid deformation results in non-isochoric microgel behavior. The presented methodology enables a realistic description of complex colloidal matter deposits during filtration.

A new time-of-flight small-angle scattering instrument at the Helmholtz-Zentrum Berlin: V16/VSANS

2014 ◽  
Vol 47 (1) ◽  
pp. 237-244 ◽  
Author(s):  
Karsten Vogtt ◽  
Miriam Siebenbürger ◽  
Daniel Clemens ◽  
Christian Rabe ◽  
Peter Lindner ◽  
...  
Keyword(s):  
Momentum Transfer ◽  
Small Angle ◽  
Soft Matter ◽  
Scattering Length ◽  
Time Of Flight ◽  
Small Angle Scattering ◽  
Neutron Guide ◽  
Macromolecular Assemblies ◽  
Angle Scattering ◽  
The Individual

Small-angle scattering methods have become routine techniques for the structural characterization of macromolecules and macromolecular assemblies like polymers, (block) copolymers or micelles in the spatial range from a few to hundreds of nanometres. Neutrons are valuable scattering probes, because they offer freedom with respect to scattering length density contrast and isotopic labelling of samples. In order to gain maximum benefit from the allotted experiment time, the instrumental setup must be optimized in terms of statistics of scattered intensity, resolution and accessible range in momentum transferQ. The new small-angle neutron scattering instrument V16/VSANS at the Helmholtz-Zentrum in Berlin, Germany, augments neutron guide collimation and pinhole optics with time-of-flight data recording and flexible chopper configuration. Thus, the availableQrange and the respective instrumental resolution in the intermediate and high momentum transfer regions can be adjusted and balanced to the individual experimental requirements. This renders V16/VSANS a flexible and versatile instrument for soft-matter research.

Assessing Metacognitive Deficiencies and Effectively Instructing Metacognitive Skills

2017 ◽  
Vol 119 (13) ◽  
pp. 1-20
Author(s):  
Marcel V. J. Veenman
Keyword(s):  
Role Model ◽  
Strong Predictor ◽  
Monitoring And Evaluation ◽  
Learning Performance ◽  
Metacognitive Skills ◽  
Learning Behavior ◽  
Metacognitive Instruction ◽  
Conditional Knowledge ◽  
On Line ◽  
The Individual

Metacognitive skills refers to individual abilities for regulating and controlling learning behavior. Orientation, goal setting, planning, monitoring, and evaluation are manifestations of those skills. Given that metacognitive skills directly affect learning behavior, they are a strong predictor of learning performance. Students display a huge variation in metacognitive skillfulness, dependent on age and experience. In this article, metacognitive skills are considered to be an acquired program of self-instructions, that is, an orderly series of condition-action rules that contain conditional knowledge about when to apply which skill, and operational instructions for how to implement a particular skill. This notion has implications for effective metacognitive instruction in deficient students. Prior to instruction, on-line assessments of metacognitive skillfulness during actual task performance are indispensable for the identification of deficient students and for tailoring metacognitive instruction to the individual needs of students. Instruction should subsequently address what skill to perform when, why, and how (WWW&H), embedded within the context of a given task. Moreover, instruction should explicitly inform students about the benefits of applying metacognitive skills to make them exert the required effort. Finally, teachers may act as role model to students by including explicit metacognitive instruction in their lessons.

scholarly journals Taking Full Advantage of Modelling to Better Assess Environmental Risk Due to Xenobiotics

2021 ◽  
Author(s):  
Sandrine Charles ◽  
Aude Ratier ◽  
Virgile Baudrot ◽  
Gauthier Multari ◽  
Aurélie Siberchicot ◽  
...  
Keyword(s):  
Environmental Risk ◽  
Aquatic Organisms ◽  
The European Union ◽  
Time Dimension ◽  
New Era ◽  
Individual Level ◽  
Regulatory Bodies ◽  
On Line ◽  
The Individual ◽  
User Friendly

Abstract In the European Union, more than 100,000 man-made chemical substances are awaiting an environmental risk assessment (ERA). Simultaneously, ERA of chemicals has now entered a new era. Indeed, recent recommendations from regulatory bodies underline a crucial need for the use of mechanistic effect models, allowing assessments that are not only ecologically relevant, but also more integrative, consistent and efficient. At the individual level, toxicokinetic-toxicodynamic (TKTD) models are particularly encouraged for the regulatory assessment of pesticide-related risks on aquatic organisms. In this paper, we first propose a brief review of classical dose-response models to put into light the on-line MOSAIC tool offering all necessary services in a turnkey web platform whatever the type of data to analyze. Then, we focus on the necessity to account for the time-dimension of the exposure by illustrating how MOSAIC can support a robust calculation of bioaccumulation factors. At last, we show how MOSAIC can be of valuable help to fully complete the EFSA workflow regarding the use of TKTD models, especially with GUTS models, providing a user-friendly interface for calibrating, validating and predicting survival over time under any time-variable exposure scenario of interest. Our conclusion proposes a few lines of thought for an even easier use of modelling in ERA.

Implementation of Scholarship of Teaching and Learning through an On-Line Masters Program

2017 ◽  
pp. 888-918
Author(s):  
Klara Bolander Laksov ◽  
Charlotte Silén ◽  
Lena Engqvist Boman
Keyword(s):  
Medical Education ◽  
Teaching And Learning ◽  
Learning Activities ◽  
Time Study ◽  
Face To Face ◽  
Introductory Course ◽  
Part Time ◽  
On Line ◽  
The Individual

In this case study, the introductory course in an international masters program in medical education (MMedEd) called “Scholarship of Medical Education” is described. Some of the background to why the MMedEd was started and the underlying ideas and principles of the program are provided. The individual course, which consists of 10 weeks part time study on-line with an introductory face to face meeting, is described in terms of the intentions and pedagogical principles underlying the design, the teaching and learning activities, and how the students were supported to achieve the intended learning activities, as well as the challenges and concerns that arose throughout and after the course. Finally, some solutions to these problems are discussed.

LBNL and the Materials Microcharacterization Collaboratory

1998 ◽  
Vol 4 (S2) ◽  
pp. 42-43
Author(s):  
M.A. O'Keefe ◽  
J.R. Taylor ◽  
D.K. Owen
Keyword(s):  
Kansas City ◽  
Joint Project ◽  
Geographically Dispersed ◽  
In Situ Electron Microscopy ◽  
Computer Scientists ◽  
On Line ◽  
The Individual ◽  
Operator Control ◽  
Government Laboratories

In 1996 the DOE formed the Materials Microcharacterization Collaboratory (MMC) to bring together the four DOE-sponsored electron microscope user facilities in one collaboratory. The MMC will bring the microanalysis and microcharacterization tools that are available in national centers to geographically dispersed researchers working in industries, universities, and Government laboratories. It will enable these remote users to share on-line the instrumentation, knowledge and expertise available at the individual facilities making up the collaboratory.LBNL first demonstrated on-line remote control of a high-voltage TEM from Kansas City in 1995 in a joint project by LBNL computer scientists and NCEM microscopists. The microscope chosen was a 1.5MeV Kratos EM-1500 that is used for in-situ electron microscopy. In the demonstration, a specimen of an Al/Pb alloy was heated and observed, with remote-operator control of heating rate, microscope focus, and stage movement (translation and tilt).

Structure Refinements in Chemistry and Physics. A Comparative Study Using the Rietveld and the Two- Step Method

1989 ◽  
Vol 33 ◽  
pp. 261-268 ◽  
Author(s):  
G. Will ◽  
E. Jansen ◽  
W. Schäfer
Keyword(s):  
Powder Diffraction ◽  
Structure Refinement ◽  
Powder Diffraction Data ◽  
Line Broadening ◽  
Step Method ◽  
Actual Structure ◽  
Structural Calculation ◽  
On Line ◽  
The Individual

Two strategies are at present commonly used in studying and refining crystal structures from powder diffraction data: the total pattern refinement proposed by Rietveid (1969) and the two-step method originally proposed and applied by Will (Will et al., 1965). The latter one works by separating-the intensity determination of the individual peaks from the actual structure refinement, structure analysis or any structural calculation (tor example based on line broadening). Both methods have their merits, and their drawbacks.

Farmers' attitudes towards sustainable agriculture issues and environmental quality in a selected area of Bangladesh

1999 ◽  
Vol 14 (1) ◽  
pp. 22-29 ◽  
Author(s):  
M. Z. Rahman ◽  
H. Mikuni
Keyword(s):  
Agricultural Development ◽  
Management Practices ◽  
Productivity Loss ◽  
Favorable Attitude ◽  
Agricultural Technologies ◽  
Aquatic Life ◽  
The Government ◽  
The Individual ◽  
High Level

AbstractThe sustainability issues associated with agricultural development are a growing concern worldwide. This study focussed on farmers' attitudes about environmental degradation and long term productivity loss that may result from implementation of modern agricultural technologies. The study was conducted in a selected area of Bangladesh and field level data were collected from the sampled farmers through personal interviewing. Findings revealed that more than two-thirds of the farmers confronted either a medium or high level of environmental problems due to intensive cultivation. Their main concerns were stress on soil fertility, loss of essential aquatic life, and reduction of earthworms and other beneficial organisms in soil. The farmers' recommended solutions were production of high yielding crop varieties with conservation management practices, and the balanced use of chemical fertilizers and organic manures. To apply these techniques, the top expectation of the farmers was to receive subsidies for agricultural inputs, and get easy-term credit from the government or non-government organizations. Interestingly, just half the farmers in the study area possessed a less than favorable attitude towards sustainability issues of agricultural development. In other words, to them these issues were of low or marginal priority. Only 6% of them expressed a highly favorable attitude (high priority) and 44% expressed a moderate attitude. Based on correlations, the individual farmer's age, education, family size, organizational participation, television exposure, communication behavior and environmental problem confrontation were identified as the main determinants of their attitudes about sustainability issues. Hence, these factors should be considered when formulating programs and policies for agriculture development that aim for long-term sustainability.

Impacts and Effects of Publishing Legal Information in a Small Jurisdiction: Privacy v Open Justice

2014 ◽  
Vol 14 (4) ◽  
pp. 284-289 ◽  
Author(s):  
Sue du Feu ◽  
James Lambert
Keyword(s):  
Search Engines ◽  
Case Law ◽  
Public Access ◽  
Small Island ◽  
Free Access ◽  
Internet Search ◽  
Legal Information ◽  
On Line ◽  
The Individual ◽  
Information Board

AbstractThis paper, written by Sue du Feu and James Lambert, outlines the challenges faced by the Jersey Legal Information Board (JLIB) in providing free access to legal information. The power of modern internet search engines has implications for a small island jurisdiction wishing to make its case law available on-line (see: www.jerseylaw.je). Having established protocols and policies to ensure a balance between open justice and privacy, several years later, JLIB is faced with concerns from individuals who feel that continuing public access to their earlier misdemeanours is an unfair burden. The paper will explain how the JLIB addressed the challenge of publishing court judgments online while safeguarding the interests of the individual.

scholarly journals Crystalline perfection of an aluminium single crystal determined by neutron diffraction

2011 ◽  
Vol 44 (4) ◽  
pp. 681-687
Author(s):  
Sabrina Metairon ◽  
Carlos Benedicto Ramos Parente ◽  
Vera Lucia Mazzocchi ◽  
Thierry Jacques Lemaire
Keyword(s):  
Neutron Diffraction ◽  
Single Crystal ◽  
Relative Intensity ◽  
Three Dimensional ◽  
Point Of View ◽  
Crystalline Perfection ◽  
Contour Map ◽  
The Individual ◽  
Crystalline Domains

In this work, a study of the crystalline perfection of an aluminium single crystal is presented. The study shows that, from three-dimensional neutron diffraction rocking curves, it is possible to characterize the individual crystalline domains of a multidomain crystal. From a macroscopic point of view, the determination of the domains allows an evaluation of the crystalline perfection of the crystal under study. Three-dimensional rocking curves have been obtained by neutron diffraction from a large mosaic aluminium crystal. Construction of a contour map of individual domains made it easier to determine the breadth and relative intensity of each domain. The angular distances between domains were also determined.

scholarly journals Resilience in children and young people with intellectual disabilities: a review of literature

2017 ◽  
Vol 11 (3) ◽  
pp. 86-97
Author(s):  
Raghu Raghavan ◽  
Edward Griffin
Keyword(s):  
Young People ◽  
Intellectual Disabilities ◽  
Personal Attributes ◽  
Journal Articles ◽  
Children And Young People ◽  
Content Type ◽  
Increased Risk ◽  
On Line ◽  
Poor Outcomes ◽  
The Individual

Purpose Building the resilience of children with intellectual disabilities (ChID) can help reduce the personal, social and economic costs associated with mental ill health among such children. The purpose of this paper is to review the research evidence on resilience in ChID and to suggest areas for further research. Design/methodology/approach Journal articles published in the last 20 years were searched in on-line databases to find potential papers for this review. The inclusion criteria were to search for published journal articles covering the theme of resilience in ChID and their families. All identified titles and abstracts were screened which resulted in 50 articles. These were scrutinised more thoroughly and 34 remaining articles were selected for review. Findings Resilience is a dynamic process involving interactions between various risk and protective processes both internal and external to the individual that act to mediate the influences of adverse life events. Five key themes were identified within the literature which helped to form a picture of the current understanding of resilience among ChID and their careers. These were increased risk factors associated with ID, the role of personal attributes on resilience, family and resilience, schooling and resilience, and cultural factors which enhance resilience. Originality/value Despite the consistency with which poor outcomes for ChID have been reported there is little investigation of the specific causes, contributory factors and processes that might improve them. This paper contributes to greater understanding of resilience factors for children and young people with ID and provides areas for further research.

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