bluuebunny/crossref_metadata_2025_split huggingface dataset:
A simulation of R32 refrigerant mixing with R1270 to reduce GWP R410A on wall mounted air conditioning
Authors: Widodo W , Kiono B F T , Winoto S H , Utomo M S K T S 
Published: March 2021

Abstract
Refrigerant R410A is a cooling barrier that is still widely used for air conditioning. This R410A contains the Fluoro element which can increase the value of GWP. In this research simulation, we used an AC unit using R410A with the aim of reducing GWP (Global Warming Potential) by mixing synthetic refrigerant with hydrocarbons. R410A still has content GWP: Mixing using R32 / R1270 refrigerant is predicted to reduce the GWP value because R1270 is one of the hydrocarbon refrigerants that has a GWP value of only: 3. By using Refprop software it can be simulated a mixture composition starting from 50/50, 40/60, 30/70, 20/80 and 10/90. From the results of the mixture simulation conducted, obtained a mixture approaching the characteristics of R410A, namely in the mixture: 20/80 with COP: 5.17 while R410A: 4.12. Compression ratio: R410A: 2.0 and for mixed refrigerants 20/80: 1.9. The refrigerant effect of mixed refrigerants is 20/80: 254,51, R410A: 162,77. Using this refrigerant mixture can reduce the GWP value and improve the performance of the AC cooling system. This refrigerant has considerable potential to replace the R410A.
Evaluating mechanical engineering learning through digitalization
Authors: Setiadi A , Ramdhani F F , Sumirat U 
Published: March 2021

Abstract
Digitalization is one of the signature marks in the industrial revolution era 4.0. This cover several aspects of life, including mechanical engineering. In relation to the evaluation of mechanical engineering learning, digitalization is lesson study is inevitable. This paper investigates the development and implementation of digital platforms in lesson study for mechanical engineering learning. A collection of a variety of digital platforms were identified and analyzed. The results showed that even though mechanical engineering learning is shifting to digital learning, some still find it difficult to adapt. Therefore, it is strongly recommended that user-friendly applications, particularly mobile-based ones, be developed.
A simulation model to comparative analysis the effect of texture bottom shape on wear and lubrication performances for micro-groove water lubricated bearings
Authors: Jin Da , Xiao Ke , Xiang Guo , Wang Yijia , Wang Cheng , Jia Hang 
Published: March 2021

Abstract
The novelty of this paper is to explore the role of the texture bottom shape on the transient wear performance under mixed lubrication condition using a numerical model. In the numerical model, the transient interaction between the effects of wear and mixed lubrication are analyzed by incorporating the wear depth distribution into the equation of lubrication gap in each time step. A validating experiment is performed to demonstrate the effectiveness of the numerical model. The wear and lubrication performances of bearings with five bottom shapes, i.e., semi ellipse, rectangle, isosceles triangle, left triangle and right triangle, are evaluated comparatively. Additionally, the effects of operating time, operating conditions (linear speed and external load) and some input parameters on tribological performances at different bottom shapes are discussed. The simulation results reveal that the texture bottom shape has significant effect on transient wear performance, thereinto, the groove with left triangle bottom shape obtain optimal transient wear and lubrication performances compared with the other four bottom shapes. The frictional behaviors of water lubricated bearing’s contacting surface would be improved by optimizing the texture’s internal structural shape especially under severe wear operating condition.
Effect of parameters on microstructure of electrical discharge coated ZE41A magnesium alloy with tungsten carbide-copper composite electrode
Authors: Elaiyarasan U , Satheeshkumar V , Senthilkumar C 
Published: March 2021

Abstract
Electrical discharge coating is a material transfer process of EDM used for fabricating composite coating on the workpiece surface. It is applied in the several applications such as surface texturing, die and mould making industries in order to increase the wear and corrosion resistance. In this investigation, ZE41A magnesium alloy is coated with tungsten carbide- Copper (WC-Cu) powder metallurgy electrode. Electrodes are prepared under three different load conditions (150, 175 and 200 MPa). Effects of process parameters on microstructure of the coated surfaces are studied. EDC experiment is carried out by varying the process parameters viz. compaction load (CL), current (I) and pulse on time (Ton). Response characteristics considered in this study are material migration rate (MMR), layer thickness (LT) and micro hardness (MH). MMR, LT and MH increases with increase in current and pulse on time at low compaction loaded electrode. Conversely, it is decreased with low current and pulse on time at high compaction loaded. Average micro hardness of the deposited surface was 125 HV and average layer thickness was 91.6 μm. Different surface defects were identified in the deposited surface such as cracks, craters and globules. Bigger craters were observed at surface deposited with higher current (4 A) that reduced the hardness of the surface.
Practical evaluations of bioactive peptide-modified Fluorapatite/PLGA multifunctional nano-clustery composite against for root caries restorations to inhibit periodontitis-related pathogens in periodontitis care
Authors: Wang Ji-Hong , Li Yun , Jing Jin , Yue Haili , Zhang Lili , Hua Wen , Li Na , Liu Xin , Han Jianan 
Published: March 2021

Abstract
Periodontitis noted as dental care disease, which occur the inflammatory process in the teeth tissues surrounding which has the response to bacterial accumulation. The main objectives of the present investigations were to improve the multifunctional nanocomposite with PLGA@fluorapatite and enhance the bactericidal inhibitory efficiency against periodontitis-related pathogens. The peptide modified fluorapatite@PLGA nanocomposite were synthesized and physico-chemically characterized. The observed analytical results demonstrated rod-like nanoparticles formation with favorable human cell compatibility and toxicity against bacterial pathogens. In addition, the use of FA and PLGA dual agents in the composite achieved the greatest reduction in the biofilm growth and the metabolic activity of polysaccharide production. The CFU count in the biofilms was reduced by nearly 3 orders for periodontal pathogens. Therefore, the new modified peptide PLGA-FA composite promising in the root caries restorations to inhibit periodontitis related pathogens.
Uniform behavior of the electromechanical coupling factor in piezoelectric resonators
Authors: Rodríguez Orlando , Chong-Quero J Enrique 
Published: March 2021

Abstract
The coupling of mechanical and electrical energies in piezoelectric materials is a problem extensively studied by many researchers. A precise determination of this coupling is an essential aspect of the theory and performance evaluation of the piezoelectric transducers utilized in multiple medical and industrial applications. In this article, the derivation of the electromechanical coupling factor in dynamic regime,

k
,

of four of the most common piezoelectric resonators vibrating under lossless conditions is reviewed. It is explicitly demonstrated that the frequency spectrum of

k

is uniform through the resonators with respect to their fundamental mechanical resonance frequencies, regardless the vibration mode considered. This uniformity can be described by a simple mathematic expression with the ‘same form’ for all the vibration modes studied. The outcomes presented are in the hope to shed some new light on the basic functional theory of the piezoelectric resonator.
Using pycnometry and Archimedes’ principle to measure the gross and air cavity volume of fruit
Authors: Hughes Stephen , Quintero Olaya Sebastian 
Published: March 2021

Abstract
A technique based on Archimedes’ Principle is described for measuring the volume of small objects (0.5–5 cm3) less dense than water. The volume of 10 small red chillies was measured by pycnometry and an immersion Archimedes technique which involved suspending the chillies in water in a container placed on an electronic balance. A pycnometer, which uses helium gas is able to determine the internal solid volume of the chillies and water immersion the outer volume. The difference between the two volumes gives the volume of internal air cavities in the chillies. The pycnometer and immersion techniques were compared by measuring the volume of wax candles with volumes between 0.3 and 2.5 cm3. A Bland-Altman analysis revealed that the Archimedes volumes were lower than pycnometry volumes by

6.1
±
2.3
%

which needs further investigation. A combination of pycnometry and water immersion may be a useful tool for botanical studies.
Antipredator responses toward cat fur in wild brown rats tested in a semi-natural environment
Authors: Bedoya-Pérez Miguel A , Le Anna , McGregor Iain S , Crowther Mathew S 
Published: March 2021

Abstract
Sensitivity to predator-related cues and performance of antipredator behaviors are universal among prey species. Rodents exhibit a diverse suite of antipredator behaviors that have been examined in both field and laboratory studies. However, the results from the laboratory have not always translated to the field. While laboratory studies consistently indicate strong fear-inducing effects of cat fur/skin odors, it is unclear whether this occurs in the field with wild rats. To address this issue, we tested the antipredator responses of wild brown rats (Rattus norvegicus) to predatory (domestic cat fur) and nonpredatory (common brushtail possum fur) odor cues in a semi-natural experimental paradigm. Rats were housed in open air enclosures containing two feeding stations. Following several nights of acclimatization, the feeding stations were paired with cat fur, possum fur, or no fur. Rats spent less time at a feeding station that was paired with cat fur. Duration of time spent at feeding stations increased across consecutive test days and across hours within individual test nights, although the rate of increase within nights was lower for cat fur paired stations. This overall increase might reflect habituation of antipredator behaviors, increasing hunger, or loss of cue potency over time. We suggest that wild brown rats recognize and respond to cat fur odor cues, but their behavioral response is highly adaptable and finely tuned to the trade-off between predation risk and starvation that occurs across short temporal scales.
Are plumage colour and song redundant ornaments in great tits (Parus major)? It depends on the colour
Authors: Ferrer Esperanza S , Uribe Francesc , Sanz Juan José , Senar Joan Carles 
Published: March 2021

Abstract
According to current theory, the development of different conspicuous ornaments may provide multiple, redundant or unreliable information. However, multiple visual and acoustic traits have not often been tested at the same time. In this study, we analyse whether black tie size, yellow breast colour indexes (chroma and hue) and song parameters (repertoire size, strophe length, maximum and minimum frequency) are inter-correlated in male great tits (Parus major). We found that males with larger black ties sang greater repertoires and had higher song frequencies, providing redundant information. However, song parameters did not correlate with hue and chroma of the yellow breast coloration, supporting the idea that they convey different units of information. Results therefore stress that since different plumaged patches can transmit very different units of information, bird song will correlate to plumage coloration traits depending on the patch and the colour considered, an aspect rarely taken into account in previous studies relating song to plumage colour traits.
A minimum aberration-type criterion for selecting space-filling designs
Authors: Tian Ye , Xu Hongquan 
Published: March 2021

Summary
Space-filling designs are widely used in computer experiments. Inspired by the stratified orthogonality of strong orthogonal arrays, we propose a criterion of minimum aberration-type for assessing the space-filling properties of designs based on design stratification properties on various grids. A space-filling hierarchy principle is proposed as a basic assumption of the criterion. The new criterion provides a systematic way of classifying and ranking space-filling designs, including various types of strong orthogonal arrays and Latin hypercube designs. Theoretical results and examples are presented to show that strong orthogonal arrays of maximum strength are favourable under the proposed criterion. For strong orthogonal arrays of the same strength, the space-filling criterion can further rank them based on their space-filling patterns.
The female effect—how female receptivity influences faecal testosterone metabolite levels, socio-positive behaviour and vocalization in male Southern white rhinoceroses
Authors: Jenikejew Julia , Wauters Jella , Dehnhard Martin , Scheumann Marina 
Published: March 2021

Abstract
Testosterone is known to be essential for sexual maturation as well as for the display of behavioural traits linked to reproduction. At the same time, external factors such as the presence of receptive females may affect testosterone levels, stressing the hormone’s substantial role in reproductive success. It is therefore of major interest to investigate the links between androgens, behaviour and the social environment especially in species that rely on a resilient reproduction rate, such as the white rhinoceros (WR). We collected faecal samples of 16 male Southern WR (Ceratotherium simum simum) aged between 1 and 44 years from 11 European zoos. Audio and video recordings were simultaneously taken from five of the study males that were sexually mature and had direct contact with receptive females. Our results showed a positive correlation of faecal testosterone metabolite (fTM) concentrations and progressing age up until adulthood followed by a decline in older males. While previous reproductive success did not show any effect, the access to receptive females resulted in higher fTM levels. Thereby, fTM concentrations remained at the same level regardless of the receptivity phase, while social cohesion with respective females, affiliative behaviour as well as call rates of Pant and Hiss distinctly peaked during the receptive compared to the non-receptive periods. Conclusively, the immediate presence of receptive females poses a female effect that enhances the overall androgen levels in males and, thus, might facilitate their reproductive success. However, androgens do not seem to be the main driver of behavioural changes during courtship or mating. By linking endocrinological and socio-behavioural factors, we were able to provide an applicable basis for non-invasive monitoring of reproductive behaviour in male WR in captivity, thereby contributing to deeper understanding of potential reproduction impairments in a species whose population in captivity remains not fully self-sustaining.
Shuttle-box systems for studying preferred environmental ranges by aquatic animals
Authors: Christensen Emil A F , Andersen Lars E J , Bergsson Heiðrikur , Steffensen John F , Killen Shaun S 
Published: March 2021

AbstractAnimals’ selection of environments within a preferred range is key to understanding their habitat selection, tolerance to stressors and responses to environmental change. For aquatic animals, preferred environmental ranges can be studied in so-called shuttle-boxes, where an animal can choose its ambient environment by shuttling between separate choice chambers with differences in an environmental variable. Over time, researchers have refined the shuttle-box technology and applied them in many different research contexts, and we here review the use of shuttle-boxes as a research tool with aquatic animals over the past 50 years. Most studies on the methodology have been published in the latest decade, probably due to an increasing research interest in the effects of environmental change, which underlines the current popularity of the system. The shuttle-box has been applied to a wide range of research topics with regards to preferred ranges of temperature, CO 2 , salinity and O 2 in a vast diversity of species, showing broad applicability for the system. We have synthesized the current state-of-the-art of the methodology and provided best practice guidelines with regards to setup, data analyses, experimental design and study reporting. We have also identified a series of knowledge gaps, which can and should be addressed in future studies. We conclude with suggesting some obvious directions for research using shuttle-boxes within evolutionary biology and behavioural and physiological ecology.
H3ABioNet genomic medicine and microbiome data portals hackathon proceedings
Authors: Fadlelmola Faisal M , Ghedira Kais , Hamdi Yosr , Hanachi Mariem , Radouani Fouzia , Allali Imane , Kiran Anmol , Zass Lyndon , Alsayed Nihad , Fassatoui Meriem , Samtal Chaimae , Ahmed Samah , Da Rocha Jorge , Chaqsare Souad , Sallam Reem M , Chaouch Melek , Farahat Mohammed A , Ssekagiri Alfred , Parker Ziyaad , Adil Mai , Turkson Michael , Benchaalia Aymen , Benkahla Alia , Panji Sumir , Kassim Samar , Souiai Oussema , Mulder Nicola 
Published: March 2021

Abstract
African genomic medicine and microbiome datasets are usually not well characterized in terms of their origin, making it difficult to find and extract data for specific African ethnic groups or even countries. The Pan-African H3Africa Bioinformatics Network (H3ABioNet) recognized the need for developing data portals for African genomic medicine and African microbiomes to address this and ran a hackathon to initiate their development. The two portals were designed and significant progress was made in their development during the hackathon. All the participants worked in a very synergistic and collaborative atmosphere in order to achieve the hackathon's goals. The participants were divided into content and technical teams and worked over a period of 6 days. In response to one of the survey questions of what the participants liked the most during the hackathon, 55% of the hackathon participants highlighted the familial and friendly atmosphere, the team work and the diversity of team members and their expertise. This paper describes the preparations for the portals hackathon and the interaction between the participants and reflects upon the lessons learned about its impact on successfully developing the two data portals as well as building scientific expertise of younger African researchers.
Database URL: The code for developing the two portals was made publicly available in GitHub repositories: [https://github.com/codemeleon/Database; https://github.com/codemeleon/AfricanMicrobiomePortal].
Escalation and de-escalation of mechanical circulatory support in cardiogenic shock
Authors: Bertoldi Letizia F , Delmas Clement , Hunziker Patrick , Pappalardo Federico 
Published: March 2021

Abstract
Cardiogenic shock (CS) is a clinical entity that includes a wide spectrum of different scenarios. Mechanical circulatory support (MCS) plays a fundamental role in the contemporary treatment of CS, and device selection is a key element in determining optimal treatment in this complex population. Cardiac support with mechanical devices should allow reduction and complete weaning from inotropes. Persistence of elevated left ventricular (LV) filling pressures, pulmonary congestion, metabolic decompensation, and end-organ damage during current MCS are criteria for MCS escalation. Precise diagnosis of the underlying cause of right ventricular (RV) failure is fundamental for undertaking the correct escalation strategy. In the setting of both MCS escalation and de-escalation, it is important to select a strategy in relation to long-term perspectives (bridge-to-recovery, bridge-to-LV assist device, or bridge-to-heart transplantation). Small retrospective studies have demonstrated that the BiPella approach is feasible, reduces cardiac filling pressures and improves cardiac output across a range of causes of CS. Simultaneous LV and RV device implantation and lower RV afterload may be associated with better outcomes in biventricular CS, but prospective studies are still required.
Weaning from Impella and mobilization of Impella patients
Authors: Bertoldi Letizia Fausta , Montisci Andrea , Delmas Clement , Pappalardo Federico 
Published: March 2021

AbstractWeaning of patients from Impella is complex and includes evaluation of the underlying disease, which is essential for estimating the potential for heart recovery. Monitoring during the weaning phase with echocardiography and pulmonary artery catheters will be discussed, as well as the use of intravenous and oral heart failure drugs. Patients who are candidates for weaning must be stable, without inotropes, and must have recovered from acute end-organ damage. Coronary artery disease and valvular heart diseases should be appropriately addressed before weaning to take the maximum advantage of haemodynamic stability provided by the support and to maximize the possibility of weaning. Tips and tricks for the mobilization of Impella patients will also be discussed.
A scoping review: global health literacy interventions for pregnant women and mothers with young children
Authors: Melwani Satish , Cleland Verity , Patterson Kira , Nash Rosie 
Published: March 2021

Summary
The World Health Organization is focused on enhancing health literacy (HL) throughout the life-course to address the growing burden of non-communicable diseases (NCDs) globally. Pregnancy and early motherhood offer a window of opportunity to address NCDs risk earlier in the life-course. Empowering women through HL may help to reduce the intergenerational impact of NCDs. A scoping review of the international literature was conducted to identify HL interventions that focused on improving NCD-related health outcomes or health behaviors of pregnant women and/or mothers with young children. The search was conducted on 4 databases and identified 5019 articles. After full text screening, 25 studies met the inclusion criteria. No study acknowledged their intervention as an HL intervention, even though they were assessed as targeting various HL dimensions. Only one study measured the HL of mothers. The review suggests that HL interventions are being underutilized and highlight the need to create awareness about the importance of addressing HL of pregnant women and mothers using appropriate tools to understand HL strengths and challenges in achieving healthy lifestyle practices. This can help to co-design locally responsive solutions that may enable women to make informed healthier lifestyle choices for themselves and for their children and thus may accelerate prevention of NCDs globally.