scholarly journals Selection of Adequate Species for Degraded Areas by Oil‐Exploitation Industry as a Key Factor for Recovery Forest in the Ecuadorian Amazon

2016 ◽  
Vol 27 (7) ◽  
pp. 1771-1780 ◽  
Author(s):  
Jaime Villacís ◽  
Cristina Armas ◽  
Susana Hang ◽  
Fernando Casanoves
Keyword(s):  
Oil Exploitation ◽  
Ecuadorian Amazon ◽  
Key Factor ◽  
Selection Of

scholarly journals Procedure for the Selection of Rubber Compound in Rubber-Metal Springs for Vibration Isolation

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1737
Author(s):  
Milan Banić ◽  
Dušan Stamenković ◽  
Aleksandar Miltenović ◽  
Dragan Jovanović ◽  
Milan Tica
Keyword(s):  
Numerical Simulation ◽  
Constitutive Model ◽  
Vibration Isolation ◽  
Correct Selection ◽  
Virtual Experiment ◽  
Rubber Compound ◽  
Key Factor ◽  
Railway Engineering ◽  
Selection Of

The selection of a rubber compound has a determining influence on the final characteristics of rubber-metal springs. Therefore, the correct selection of a rubber compound is a key factor for development of rubber-metal vibration isolation springs with required characteristics. The procedure for the selection of the rubber compound for vibration isolation of rubber-metal springs has been proposed, so that the rubber-metal elements have the necessary characteristics, especially in terms of deflection. The procedure is based on numerical simulation of spring deflection with Bergström-Boyce constitutive model in virtual experiment, with a goal to determine which parameters of the constitutive model will lead to spring required deflection. The procedure was verified by case study defined to select rubber compound for a rubber–metal spring used in railway engineering.

scholarly journals Why We Go Where We Go: Profiling User Decisions on Choosing POIs

2020 ◽  
Author(s):  
Renjun Hu ◽  
Xinjiang Lu ◽  
Chuanren Liu ◽  
Yanyan Li ◽  
Hao Liu ◽  
...  
Keyword(s):  
Key Factors ◽  
Real World Data ◽  
Decision Factors ◽  
Point Of Interest ◽  
Learning Factor ◽  
Poi Recommendation ◽  
Key Factor ◽  
Selection Of ◽  
Decision Structures

While Point-of-Interest (POI) recommendation has been a popular topic of study for some time, little progress has been made for understanding why and how people make their decisions for the selection of POIs. To this end, in this paper, we propose a user decision profiling framework, named PROUD, which can identify the key factors in people's decisions on choosing POIs. Specifically, we treat each user decision as a set of factors and provide a method for learning factor embeddings. A unique perspective of our approach is to identify key factors, while preserving decision structures seamlessly, via a novel scalar projection maximization objective. Exactly solving the objective is non-trivial due to a sparsity constraint. To address this, our PROUD adopts a self projection attention and an L2 regularized sparse activation to directly estimate the likelihood of each factor to be a key factor. Finally, extensive experiments on real-world data validate the advantage of PROUD in preserving user decision structures. Also, our case study indicates that the identified key decision factors can help us to provide more interpretable recommendations and analyses.

scholarly journals Molecular bases for the selection of the chromophore of animal rhodopsins

2015 ◽  
Vol 112 (50) ◽  
pp. 15297-15302 ◽  
Author(s):  
Hoi Ling Luk ◽  
Federico Melaccio ◽  
Silvia Rinaldi ◽  
Samer Gozem ◽  
Massimo Olivucci
Keyword(s):  
Excited States ◽  
Sequence Divergence ◽  
Evolutionary Transition ◽  
Structure Changes ◽  
Bovine Rhodopsin ◽  
Key Factor ◽  
Pcc 7120 ◽  
Molecular Bases ◽  
Amino Acid Sequence Divergence ◽  
Selection Of

The functions of microbial and animal rhodopsins are triggered by the isomerization of their all-trans and 11-cis retinal chromophores, respectively. To lay the molecular basis driving the evolutionary transition from the all-trans to the 11-cis chromophore, multiconfigurational quantum chemistry is used to compare the isomerization mechanisms of the sensory rhodopsin from the cyanobacterium Anabaena PCC 7120 (ASR) and of the bovine rhodopsin (Rh). It is found that, despite their evolutionary distance, these eubacterial and vertebrate rhodopsins start to isomerize via distinct implementations of the same bicycle-pedal mechanism originally proposed by Warshel [Warshel A (1976) Nature 260:678–683]. However, by following the electronic structure changes of ASR (featuring the all-trans chromophore) during the isomerization, we find that ASR enters a region of degeneracy between the first and second excited states not found in Rh (featuring the 11-cis chromophore). We show that such degeneracy is modulated by the preorganized structure of the chromophore and by the position of the reactive double bond. It is argued that the optimization of the electronic properties of the chromophore, which affects the photoisomerization efficiency and the thermal isomerization barrier, provided a key factor for the emergence of the striking amino acid sequence divergence observed between the microbial and animal rhodopsins.

Research on Flow Measurement Technology in the Field Test of Pumping Station Engineering

2013 ◽  
Vol 475-476 ◽  
pp. 75-81
Author(s):  
Jian Gang Feng ◽  
You Wei Xu
Keyword(s):  
Field Test ◽  
Flow Measurement ◽  
Measurement Technology ◽  
Measuring Instruments ◽  
Pumping Station ◽  
Key Factor ◽  
Working Principle ◽  
Main Basis ◽  
Technical And Economic Indicators ◽  
Selection Of

Pumping station engineering field test is the main basis of pumps technical renovation and the assessment of technical and economic indicators. Flow measurement is a key content of pumping station in the engineering field test. How to choose a reliable and applicable, economic and effective measurement method and measuring instruments is the key factor of success for flow measurement. In this paper, starting from the characteristics of pumping station engineering field test technology, to research it in three aspects .They are the method of flow measurement classification, working principle and characteristics of common measuring instruments, measurement methods and the selection of instruments and equipment. It also analyzes the different types of pumping station flow measurement technologies in engineering field test, and makes some explanation combined with typical examples pumping station project flow measurement.

Stacking apertures and estimation strategies for reflection and diffraction enhancement

Geophysics ◽  
2016 ◽  
Vol 81 (4) ◽  
pp. V271-V282 ◽  
Author(s):  
Jorge H. Faccipieri ◽  
Tiago A. Coimbra ◽  
Leiv-J. Gelius ◽  
Martin Tygel
Keyword(s):  
Fresnel Zone ◽  
Careful Selection ◽  
Time Migration ◽  
Key Factor ◽  
Common Reflection Surface ◽  
Good Potential ◽  
Image Quality Improvement ◽  
The Common ◽  
Selection Of

It is well known that the quality of stacking results (e.g., noise reduction, event enhancement, and continuity) can be greatly influenced not only by the traveltime operator chosen but also by the apertures used. We have considered two so-called diffraction-stack traveltimes, together with the corresponding apertures, designed to enhance reflections and diffractions, respectively. The first one is the common-reflection-surface (CRS) diffraction traveltime that is obtained from the general CRS traveltime upon the condition that the target reflector reduced to a point, which we refer to as the diffraction CRS (DCRS) traveltime. The second one is the double-square-root (DSR) traveltime, well established in time migration. We have observed that the DCRS and DSR traveltimes depend on fewer parameters (two in 2D and five in 3D) than the full CRS traveltime (three in 2D and eight in 3D). For the DCRS and DSR traveltimes, we have proposed specific apertures based on the projected Fresnel zone, which are able to produce high-quality stacked sections using less parameters to be estimated. The key factor in that approach lies in the choice of traveltime operators together with careful selection of stacking apertures. In particular, suitable choices of operators and apertures lead to stacking volumes in which reflections are enhanced (and the diffractions are attenuated) or the corresponding ones in which diffractions are enhanced (and reflections are attenuated). Synthetic and field data confirm the proposed approach has good potential for image-quality improvement.

Research on Polyvinylidene Fluoride Hollow Fiber Hemodialyzers

2011 ◽  
Vol 301-303 ◽  
pp. 67-72
Author(s):  
Jian Hui Guo ◽  
Juan Zhang ◽  
Xiao Long Lü
Keyword(s):  
Renal Failure ◽  
Hollow Fiber ◽  
Polyvinylidene Fluoride ◽  
Mechanical Performance ◽  
Rejection Rate ◽  
Mass Content ◽  
Key Factor ◽  
Dope Solution ◽  
Hemodialysis Membrane ◽  
Selection Of

Hemodialysis is the main treatment of acute and chronic renal failure, and the selection of hemodialysis membrane materials is the key factor that determines the curative possibilities. By changing the membrane forming conditions, we have spun polyvinylidene fluoride (PVDF) hollow fiber membranes with the same inner diameters but different wall thicknesses. Via centrifugal moulding, we have also made membranes into dialyzers to study the mechanical performance of the membranes and the dialysis performance of the dialyzers. The results show that the mechanical performance meets the demand of dialysis. For the dialyzers with 30μm fiber walls, the clearance rates of urea and lysozyme are 90% and 75% respectively, and the rejection rate of bovine serum albumin (BSA) comes to 90% plus. The increase of the mass content of the dope solution polyethylene glycol (PEG) from 19% to 22% decreases the rejection rate of BSA.

scholarly journals Etiology of bloodstream infections at a population level during 2013-2017 in the Autonomous Community of Valencia, Spain

2020 ◽  
Vol 33 (3) ◽  
pp. 200-206
Author(s):  
Laura Ruiz-Azcona ◽  
Miguel Santibañez ◽  
Adelina Gimeno ◽  
Francisco Javier Roig ◽  
Hermelinda Vanaclocha ◽  
...  
Keyword(s):  
Antibiotic Therapy ◽  
Bloodstream Infections ◽  
Population Level ◽  
Empirical Treatment ◽  
Autonomous Community ◽  
Coagulase Negative Staphylococci ◽  
Mortality And Morbidity ◽  
Enterococcus Spp ◽  
Key Factor ◽  
Selection Of

Introduction. Bloodstream Infections has become in one of the priorities for the antimicrobial stewardship teams due to their high mortality and morbidity rates. Usually, the first antibiotic treatment for this pathology must be empirical, without microbiology data about the microorganism involved. For this reason, the population studies about the etiology of bacteremia are a key factor to improve the selection of the empirical treatment, because they describe the main microorganisms associated to this pathology in each area, and this data could facilitate the selection of correct antibiotic therapy. Material and methods. This study describes the etiology of bloodstream infections in the Southeast of Spain. The etiology of bacteremia was analysed by a retrospective review of all age-ranged patients from every public hospital in the Autonomous Community of Valencia (approximately 5,000,000 inhabitants) for five years. Results. A total of 92,097 isolates were obtained, 44.5% of them were coagulase-negative staphylococci. Enterobacteriales was the most prevalent group and an increase in frequency was observed along the time. Streptococcus spp. were the second microorganisms more frequently isolated. Next, the most prevalent were Staphylococcus aureus and Enterococcus spp., both with a stable incidence along the study. Finally, Pseudomonas aeruginosa was the fifth microorganism more frequently solated. Conclusions. These data constitute a useful tool that can help in the choice of empirical treatment for bloodstream infections, since the knowledge of local epidemiology is key to prescribe a fast and appropriate antibiotic therapy, aspect capital to improve survival.

scholarly journals A Day at School / Une Journée à L’école by S. Cordier & C. Lacroix

2015 ◽  
Vol 4 (3) ◽  
Author(s):  
Leslie Aitken
Keyword(s):  
Picture Book ◽  
Children’S Literature ◽  
Target Audience ◽  
First Year ◽  
Intended Audience ◽  
University Of Alberta ◽  
Key Factor ◽  
Grade One ◽  
The University ◽  
Selection Of

Cordier, Séverine and Cynthia Lacroix.  A Day at School / Une Journée à L’école.  Trans. Sarah Quinn. Toronto: Owlkids Books, 2013. Print. The format co-creators Cordier and Lacroix use in Picture My Day, Picture My World, and A Day at the Farm succeeds very nicely in this picture book as well.  Their success has much to do with both their sensitivity to the target audience (pre-school to grade one), and their anticipation of the book’s use. They provide abundant illustration, keeping the text very brief.  Short sentences or mere labeling hint at, but do not force, the storyline.  The latter is created, in large part, by the reader.This book would work very well in a one-on-one situation: one adult, one child.  The adult might prompt,“Where do you think they went on their holidays? What are they buying for school? How are they getting ready for their day?  I wonder where Mummy and the baby are going?  Let’s see where Daddy and the children are going.” and so forth.Inspired by an array of color filled drawings, even a non-reading child could flesh out the story, making it the same every time—for comfort’s sake—or different every time—for variety’s sake.   The key factor is the child’s involvement.The vocabulary used in the text is well within the range of the intended audience.  Most five-year-olds would begin to memorize the text after a few readings; most grade ones would actually recognize and read the words by the end of their first year at school.  In sum, A Day at School is an invitation to imagine, to create, to read and to learn.Highly recommended: 4 out of 4 starsReviewer: Leslie AitkenLeslie Aitken’s long career in librarianship involved selection of children’s literature for school, public, special, and university collections.  She is a former Curriculum Librarian at the University of Alberta.

scholarly journals Imagination as a key factor in LMLS in transnational families

2019 ◽  
Vol 2019 (255) ◽  
pp. 73-107
Author(s):  
Li Wei ◽  
Zhu Hua
Keyword(s):  
Language Maintenance ◽  
Language Shift ◽  
Ethnic Origin ◽  
Transnational Families ◽  
Heritage Languages ◽  
Self Evaluation ◽  
Key Factor ◽  
The Uk ◽  
Over Time ◽  
Selection Of

AbstractThis article argues that imagination plays a key role in whether and how members of transnational families individually and collectively maintain or relinquish their heritage languages and adopt other languages as part of their multilingual repertoires. Imagination is defined here as the vision of where and what one might be or become at some future point in time. We base our argument on linguistic ethnography over two decades with transnational families of Chinese ethnic origin in the UK. Families that seem to have kept their heritage languages and families that have given them up were invited to talk about where, what and how they would see themselves in ten years’ time, and a selection of them are subsequently interviewed and observed after the ten-year period. Their responses are analysed in terms of their constructed experiences, environments and visions of the future; their perceptions and imaginations of different places and cultures; key moments in re-evaluation, or re-imagining, that led to major behavioural changes; and self-evaluation of their imaginations. Particular attention is given to the dynamics of differences and tensions between the imaginations of individuals of the same families, as well as changes to the imaginations over time. Theoretical and methodological implications of studying imagination as a key factor for language maintenance and language shift, and for bilingualism research generally, are discussed.

scholarly journals Does ENaC Work as Sodium Taste Receptor in Humans?

Nutrients ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1195 ◽  
Author(s):  
Albertino Bigiani
Keyword(s):  
Taste Receptor ◽  
Taste System ◽  
Physiological Processes ◽  
Salty Taste ◽  
Key Factor ◽  
Taste Reception ◽  
The Common ◽  
Preference Responses ◽  
Selection Of ◽  
Epithelial Sodium Channel Enac

Taste reception is fundamental for the proper selection of food and beverages. Among the several chemicals recognized by the human taste system, sodium ions (Na+) are of particular relevance. Na+ represents the main extracellular cation and is a key factor in many physiological processes. Na+ elicits a specific sensation, called salty taste, and low-medium concentrations of table salt (NaCl, the common sodium-containing chemical we use to season foods) are perceived as pleasant and appetitive. How we detect this cation in foodstuffs is scarcely understood. In animal models, such as the mouse and the rat, the epithelial sodium channel (ENaC) has been proposed as a key protein for recognizing Na+ and for mediating preference responses to low-medium salt concentrations. Here, I will review our current understanding regarding the possible involvement of ENaC in the detection of food Na+ by the human taste system.

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