bluuebunny/crossref_metadata_2025 huggingface dataset:
In situ photo-crosslinking hydrogel with rapid healing, antibacterial, and hemostatic activities
Authors: Qin Xiaolei , Mukerabigwi Jean Felix , Ma Mingzi , Huang Ruyi , Ma Mengdi , Huang Xueying , Cao Yu , Yu Yang
Published: August 2021

Uncontrollable bleeding is still the main cause of post-traumatic deaths due to the blood loss. Moreover, infectious complication of wound is also still a challenging problem for wound healing. Nevertheless, the currently available hemostasis drugs or materials cannot stanch bleeding well due to single function, slow in effectiveness, adhere to wounds easily, poor gas permeability, etc. Therefore, it is of a great significance to utilize a biomedical hemostatic material that can stop bleeding quickly, preventing from bacterial infections, and with good biocompatibility properties. Herein chitosan (CS) was modified with gallic acid (GA) and thrombin (TB) to prepare an antibacterial hemostatic composite dressing. The CS-based composite hydrogel dressing was obtained by acylation modification, ultraviolet curing crosslinking method and physical mixing. The in vitro results showed that our prepared CS-based composite hydrogel has obvious burst release and good degradation property. Moreover, the in vivo results showed that it has a strong antibacterial property that is much better than single CS, and it can stop bleeding in 1 min which can promote wound healing. Therefore, the findings of this study is expected to contribute to the future designing of biomedical hemostatic materials with improved properties.
Post-translational lysine ac(et)ylation in health, ageing and disease
Authors: Blasl Anna-Theresa , Schulze Sabrina , Qin Chuan , Graf Leonie G. , Vogt Robert , Lammers Michael
Published: August 2021

The acetylation/acylation (ac(et)ylation) of lysine side chains is a dynamic post-translational modification (PTM) regulating fundamental cellular processes with implications on the organisms’ ageing process: metabolism, transcription, translation, cell proliferation, regulation of the cytoskeleton and DNA damage repair. First identified to occur on histones, later studies revealed the presence of lysine ac(et)ylation in organisms of all kingdoms of life, in proteins covering all essential cellular processes. A remarkable finding showed that the NAD+-dependent sirtuin deacetylase Sir2 has an impact on replicative lifespan in Saccharomyces cerevisiae suggesting that lysine acetylation has a direct role in the ageing process. Later studies identified sirtuins as mediators for beneficial effects of caloric/dietary restriction on the organisms’ health- or lifespan. However, the molecular mechanisms underlying these effects are only incompletely understood. Progress in mass-spectrometry, structural biology, synthetic and semi-synthetic biology deepened our understanding of this PTM. This review summarizes recent developments in the research field. It shows how lysine ac(et)ylation regulates protein function, how it is regulated enzymatically and non-enzymatically, how a dysfunction in this post-translational machinery contributes to disease development. A focus is set on sirtuins and lysine acyltransferases as these are direct sensors and mediators of the cellular metabolic state. Finally, this review highlights technological advances to study lysine ac(et)ylation.
Optimization of foaming process: drying behaviour, physicochemical, and powder properties of hot air-assisted foam-mat dried nectarine
Authors: Tekgül Yeliz
Published: August 2021

Nectarine powder is widely used in the industries of baking and confectionery. The production of nectarine powder can be made by several drying techniques such as spray, tray, drum, freeze, and foam mat. This study was aimed to optimize the parameters of the nectarine foaming process. Besides, hot air-assisted foam-mat drying of nectarine was carried out to evaluate the effect of different temperatures (50, 60, and 70 °C) on drying kinetics, physicochemical and powder properties of nectarine powder. Factors studied were egg albumin concentration, carboxymethyl cellulose concentration, and whipping time that varied between 10 and 30% (by weight), 0.2–0.8% (by weight), and 3–5 min, respectively. Optimum conditions were determined as 30% of egg albumin, 0.8% carboxymethyl cellulose, and a whipping time of 5 min to get maximum foam expansion, high foam stability, and minimum foam density. The drying rate and effective moisture diffusivity of nectarine foam powder increased with increasing drying temperature. Carr Index and Hauser Ratio values were in the range of 32.31–47.00 and 1.48–2.00, respectively. Foamed nectarine powder dried at 70 °C had the lowest hygroscopicity value and the highest wettability value. No significant difference was found between the powders’ porosity (p > 0.05). The powders produced at 50 °C resulted in higher total phenolic, vitamin C, and carotenoid content.
Current state and future challenges in deep space communication: A survey
Authors: Könsgen Andreas , Förster Anna
Published: August 2021

Communication has been crucial since the beginning of space exploration. Control information and telemetry data of the space vessels as well as voice and video communication of the crew with the ground control have to be maintained. This paper is a survey for readers new to the topic to get an overview about the current status of space communication in national agencies and standardization bodies and ongoing research in the field. It also gives a short overview about the historical development and finally summarizes the authors’ thoughts about future challenges in space communication.
A fo bont, bid ben: colonial and postcolonial ideologies in debates on renaming the Second Severn Crossing
Authors: Listewnik Marta
Published: August 2021

This paper analyses political and media discourse surrounding the UK government’s decision to change the name of the Second Severn Crossing, a motorway bridge over the river between Wales and England, to the Prince of Wales Bridge in order to commemorate the 70th birthday of Prince Charles. This decision, taken without the prior consultation of Welsh citizens, caused a public uproar and resulted in disputes among politicians as well as in mainstream and social media. This article explores the case of renaming this landmark construction by relating it to the concepts of colonial and postcolonial ideologies, power and national identity. A thematic analysis of media discourse and a debate in the National Assembly for Wales demonstrates how attempts to manipulate the cultural and linguistic landscape reveal political and social tensions within Welsh society, bringing to the fore current issues concerning Welsh identity.
Notes Toward an Extimate Materialism: A Reply to Graham Harman
Authors: Sbriglia Russell
Published: August 2021

This article mounts a defense of my and Slavoj Žižek’s co-edited anthology,Subject Lessons: Hegel, Lacan, and the Future of Materialism, against the two main criticisms of it made throughout Graham Harman’s article “The Battle of Objects and Subjects”: (1) that we and our fellow contributors are guilty of gross overgeneralization when we classify thinkers from various schools of thought – among them New Materialism, object-oriented ontology, speculative realism, and actor–network theory – under the broad rubric of the “new materialisms”; and (2) that despite our pretensions to the mantle of materialism, our Lacano-Hegelian position is actually a full-blown idealism. In responding to and attempting to refute these criticisms, I make the case that our Lacano-Hegelian model of dialectical materialism is an “extimate materialism.”
Changing People’s Preferences by the State and the Law
Authors: Porat Ariel
Published: August 2021

In standard economic models, two basic assumptions are made: the first, that actors are rational, and the second, that actors’ preferences are a given and exogenously determined. Behavioral economics — followed by behavioral law and economics — has questioned the first assumption. This Article challenges the second one, arguing that in many instances, social welfare should be enhanced not by maximizing satisfaction of existing preferences but by changing the preferences themselves. The Article identifies seven categories of cases where the traditional objections to intentional preference change by the state and the law lose force and argues that in these cases, such a change warrants serious consideration. It then proposes four different modes of intervention in people’s preferences, varying in intensity, on the one hand, and in the identity of their addressees, on the other, and explains the relative advantages and disadvantages of each form of intervention.
Mixed convection flow of Brinkman fluid with convective boundary condition at lower stagnation point of horizontal circular cylinder
Authors: Mohd Kanafiah Siti Farah Haryatie , Mohd Kasim Abdul Rahman , Mohd Zokri Syazwani , Al Sharifi Hussien Ali Muhammed
Published: August 2021

Convective heat transfer occurs when heat is transferred from one level to another upon  the motion of fluid.  Understanding on the characteristics of fluid flow is essential since it will produce the desired output of the product.  therefore, this paper examines the mixed convection flow at lower stagnation point of horizontal circular cylinder on Brinkman fluid saturated in porous region with convective boundary condition. The influence of Brinkman, mixed convection and conjugate parameter on the flow field are studied.  To reduce the complexity of the equations, a suitable similarity transformation is used. The numerical results of governing equations are obtained via bvp4c tools in Matlab. The effect of  mixed convection, Brinkman and conjugate parameter on the temperature and velocity profile, skin friction coefficient together with Nusselt number are analysed and portrayed in graph and table form.  The velocity profile increased with improving mixed convection and conjugate value, but decreased with increasing Brinkman factor.  It is also discovered that the temperature decrease when the mixed convection parameter increase.  This theoretical results will benefit the researchers, particularly in the manufacturing industry, in validating experimental study data.
Boundary layer flow on permeable flat surface in Ag-Al2O3/water hybrid nanofluid with viscous dissipation
Authors: MOHAMED MUHAMMAD KHAIRUL ANUAR , A. Hussanan  , H.T. Alkasasbeh  , B. Widodo  , M.Z. Salleh
Published: August 2021

Seeking the better performance nanofluid but with low cost of production, presence challenged. Metal nanomaterial is good in both thermal and electric conductivity but expensive while oxide nanomaterial does oppositely. The present study solved numerically the laminar boundary layer flow over a permeable flat surface in a blended metal-oxide hybrid nanofluid plate with viscous dissipation effects. The similarity equations in the form of the set of ordinary differential equations are reduced from the non-linear partial differential equations before being solved numerically using the Runge-Kutta-Fehlberg method in MAPLE. The numerical solution is obtained for the reduced skin friction coefficient and reduced Nusselt number as well as the temperature and velocity profiles. The flow features and the heat transfer characteristic for the Eckert number, permeability parameter and nanoparticle volume fraction are analyzed and discussed. The Ag-Al2O3 water-based hybrid nanofluid tested in this study shows competitive results with the Ag water-based nanofluid in certain cases.
In-vitro antioxidant potential of the flavonoid glycosides from Cassia tora linn. Leaves
Authors: Vijayalakshmi A. , Jayakumari S. , Masilamani K.
Published: August 2021

The present study aimed to study the anti-oxidant potential of isolated flavonoids from the ethanol extract (70%v/v) of Cassia tora leaves. Three flavonoids were isolated viz Luteolin-7-O-β-glucopyranoside (I), quercetin-3-O-β-d-glucuronide (II) and Formononetin-7-O-β-D-Glucoside (III) from the ethanol extract (70%v/v) of Cassia tora leaves in the previous study. A comprehensive study on the phytochemical contents - total phenolic content and flavonoid content was accessed using Folin-Denis and AlCl3 method respectively. The antioxidant potential of the samples was evaluated using inhibition of hydroxyl radical, 2,2-diphenyl-1-picrylhydrazyl (DPPH), and nitric oxide scavenging methods. The total phenolic content and flavonoid content was found to be 18.60 % w/w and 9.5% w/w respectively. The IC50 values of ethanol extract against hydroxyl, DPPH and nitric oxide radical were found to be 270 µg/mL, 190 µg/mL and 130 µg/mL respectively. The radical scavenging activity of the isolated flavonoids decreased in the following order: quercetin (IC50 values 15, 14, 18 µg/mL) >formononetin (IC50 values 19, 21, 14 µg/mL) > luteolin (IC50 values 20, 23, 18 µg/mL) respectively.
THE IMPACT OF SOCIAL MEDIA ON THE YOUTH: THE GHANAIAN PERSPECTIVE
Authors: Ocansey Selasi Kwame , Ametepe Wolali , Oduro Charles Fynn
Published: August 2021

Today's world is a global village. Everyone is connected to one another in this vast network generated by the Internet. As social media sites continue to grow in popularity it promises a lot for the modern youth. Social media has been widely adopted, with high enthusiasm among youth around the world. With very few studies focusing on youth social media use in Ghana there is wide open array of work to be done. Based on the findings of several research studies in social media area, it has been found that these Social networking sites are having a great impact on the lives of young people. Also since most of the research works have been carried out in other countries, it was found necessary and important to carry out a study in Ghana on the impact of Social Media on the youth. The main objectives of this study were to investigate the extent of social media use and the purposes, access and impact of its use by the young people in Ghana. Two hundred youth aged between 15-25 participated in the study.

The findings revealed patterns of young people's social media use consistent with similar studies of youths in other countries. The study revealed the need for young people to have a greater awareness of the risks of social media use. It was found that the majority of Ghanaian youths were using Social media on an enormous scale, mainly for communication purposes. According to this study, although social media has a positive impact on the youth, yet quite a large number of respondents reported having met with negative experiences on these online sites.
Cancer Risk Assessment of Trihalomethanes Exposure in Tap and Swimming Pool Water in Kuantan Hotel
Authors: Marekan M.E.S. , Suhaimi A.A. , Hussin N.M. , Romzay R.A.
Published: August 2021

Chlorination is a common disinfection method for tap and swimming pool water as it is the most effective and low-cost method compared with others. The purpose of the study was to assess cancer risk of THMs exposure in tap and swimming pool water in Kuantan hotels. Temperature and pH were analyzed as an in-situ measurement while the rest of the parameters were analyzed in the laboratory. The concentration of four forms of THMs in tap and swimming pool water analyzed from Hotel X are 1.23ug/L and 1.35ug/L for CHCl3 respectively and none for the CHCl2Br, CHClBr2 and CHBr3. The concentration of four forms of THMs in tap and swimming pool water at Hotel Y are 1.25ug/L and 1.18ug/L respectively for CHCl3 and none for the CHCl2Br, CHClBr2 and CHBr3. The cancer risk from exposure to THMs at Hotel X are 1.6 x 10- 5 for tap water, 1.9 x 10-5 for swimming pool water and 2.0 x 10-4 for both tap and swimming pool water while cancer risk from exposure to THMs at Hotel Y are 1.7 x 10-5 for tap water, 1.6 x 10-5 for swimming pool water and 1.19 x 10-4 for both tap and swimming pool water.Thus, it shows that, it is in range of acceptable risk.
Generalized -Cancellativity of -AG-Groupoids
Authors: Gaketem Thiti
Published: August 2021

In this paper we study some properties of a –cancellativity on a  -AG-groupoid. Finally we study quasi--cancellativity which is a generalization of a -cancellativity.
Carbon Nanotube-Graphene hybrid: Recent Synthesis Methodologies and Applications
Authors: Ijeomah Geoffrey , Samsuri Fahmi , Md Zawawi Mohamad Adzhar , Obite Felix
Published: August 2021

The melding of one-dimensional (1D) carbon nanotubes (CNTs) and two-dimensional (2D) graphene to generate a CNT-graphene hybrid with 3-dimensional (3D) features has generated a lot of scientific interest owing to the synergistic consequences of the resulting interface hybrid on the electrical, mechanical, electrochemical and optical properties, which presents plethora of opportunities in both fundamental research and device applications. The review presents an overview of the recent perspectives made in the field of CNT-graphene hybrid architectures. The possible applications particularly in device sensing, as well as challenges are also presented.
A Review on Autonomous Driving Systems
Authors: Yaakub Salma , Alsibai Mohammed Hayyan
Published: August 2021

Autonomous vehicles are one of the promising solutions to reduce traffic crashes and improve mobility and traffic system. An autonomous vehicle is preferable because it helps in reducing the need for redesigning the infrastructure and because it improves the vehicle power efficiency in terms of cost and time taken to reach the destination. Autonomous vehicles can be divided into 3 types: Aerial vehicles, ground vehicles and underwater vehicles. General, four basic subsystems are integrated to enable a vehicle to move by itself which are: Position identifying and navigation system, surrounding environment situation analysis system, motion planning system and trajectory control system. In this paper, a review on autonomous vehicles and their related technological applications is presented to highlight the aspects of this industry as a part of industry 4.0 concept. Moreover, the paper discusses the best autonomous driving systems to be applied on our wheelchair project which aims at converting a manual wheelchair to a smart electric wheelchair
Machinery Maintenance Viewpoint: One Approach to an Improved Rural Road Traffic Safety in Southwest Nigeria
Authors: O. Adeyemi Hezekiah , O. Martins Oluwaseun O. Martins , O. Ade-Ikuesan Olanike O. Ade-Ikuesan, , O. Olaluwoye Olawale O. Olaluwoye
Published: August 2021

Local Governments (LGs), the third tier of government in Nigeria, are expected to maintain infrastructure facilities at the grass root level but most rural communities in Southwest Nigeria are characterized by poorly maintained roads. This study assessed conditions of Moveable Rural Road Maintenance Equipment (MRRME) under LGs in Southwest Nigeria vis-a-vis the safety levels on the rural roads. The study measured, impacts of roads conditions on commercial drivers/riders (cdr) and, level of usage of MRRME for the roads. Questionnaires were used to measure: accident rates and impacts among 250 cdr on 9 selected rural roads; Maintenance Performance Measures (MPM) of MRRME among 430 Senior Technical Officers (STOs) and Senior Finance Offices (SFOs) in 84 LG secretariats. The conditions of MRRME were carried out using observational method. More than 72% of cdr were involved in one crash or another and 89% of them attributed this to bad roads. Less than 26% of MRRME was functional with weak plans/tools put in place for correct maintenance program leading to a high level of MRRMEs’ failures and total neglect. T-test t (428) = -5.146, p = 0.421) found that the opinions of STOs (poor ratings for MPM policy implementation) were not different from that of the SFO. There is the need for safety attitudinal change among cdr. LGs also need empowerment to ensure proper maintenance of MRRME and enhances their availability. These measures among other will reduce accidents death counts on Nigeria rural roads.
Energy Audit: A Case Study in FTK Building Universiti Malaysia Pahang
Authors: Zailan Roziah , Che Kar Mohd Tarmizy
Published: August 2021

The energy audit program was carried out for Faculty of Engineering Technology (FTK), University Malaysia Pahang by internal energy audit team. This paper presented annual energy consumption trend for FTK building, measurement finding for room data survey (air conditioning temperature and humidity comfort performance & CO2 level for air quality) and lighting, Building Energy Index (BEI) value and appropriate recommendation in regards of energy saving practice and technological solution. According to those analysis, value for Building Energy Index (BEI) in FTK building is 98.035 kWh/m2/year, Air Conditioning Energy Index (ACEI) is 73.254 kWh/m2/year while for Lighting Energy Index (LEI) is 11.402 kWh/m2/year. Total energy consumption estimated for 2017 is 31, 7951.375 kWh per year. The implementation of the proposed energy conservation measures were expected to give positive results where the total cost saving per year is estimated about RM 48,551.20. Finally, it was recommended to implement three major energy conservation measures (ECMs) in specific: implementation of Sustainable energy management system (SEMS), maintenance of air conditioning system and retrofitting of LED lighting. As a result, FTK is targeted to achieve 30% annual energy saving about from the total energy consumption.
Synthesis and Characterization of TiO2 Nanotube Using Electrochemical Anodization Method
Authors: Abd Aziz Azrina
Published: August 2021

In this study, Titaium dioxide (TiO2) nanotubes (TNTs) were synthesized by a simple electrochemical anodization method.  TNTs were characterized by Field Emission Scanning Electron Microscope  (FESEM), Transmission Electron Microscope (TEM), UV-Vis Diffuse Reflectance Spectra and Photoluminescence (PL) Spectra to identify the morphology, crystalline phase and photocatalytic activity under the visible light. . The morphological analyses revealed that the inner diameter, and tube length of the synthesized TNTs has an average value of 60 nm, and 900 nm, respectively. The wall thickness of the TNTs is of 11 nm. The observed TNTs have nanotubular shape. The absorption edge in the visible range at around 400-460 nm obtained from UV-Vis Diffuse Reflectance Spectrum analysis. In addition, the PL spectral peak identified at around 400nm and 590 nm. The finding shows that the synthesized TNTs made by electrochemical anodization method has photocatalytic properties and can be used as a photocatalyst for further photocatalytic application.
Effect of Shrimp Chitosan Coating on Physico-chemical Properties and Shelf Life Extension of Banana
Authors: Sikder Md. Belal Hossain , Islam M Muksitu
Published: August 2021

Banana is highly perishable fruit and shelf life is short, which leads resulting post-harvest loss consistently in Bangladesh. To lessen the post-harvest loss and draw out the time span of the usability of banana, green mature bananas were treated with 0.5%, 0.75%, and 1% chitosan, individually. For the subsequent treatments, bananas were stored at room temperature. The viability of the coating in extending fruit’s shelf-life was assessed by evaluated total weight loss, ash content, total soluble solids (TSS), pH, titratable acidity (TA), disease severity and shelf life during the storage period. Chitosan coating reduced respiration activity, thus delaying ripening and the rate of decay due to senescence. The chitosan-coated banana samples had a better outcome on weight loss, ash content, pH, TSS, TA and disease severity values as compared to control samples. Banana coated with 1% chitosan showed less weight reduction and lessened obscuring than different treatments and control. Disease severity was astoundingly lessened by chitosan covering application. Chitosan coating extended banana up to the shelf life of more 2 to 4 days. From this investigation, it demonstrated that 1% chitosan was more appropriate in extending the shelf-life and better quality of banana during ripening and storage at ambient temperature.
Factorial Analysis on Biovinegar Production from Pineapple Waste Using Mixed Strains
Authors: K. Selvanathan Yashini , Shaarani Shalyda M. , Masngut Nasratun
Published: August 2021

One of the feasible approaches to oversee pineapple waste deposit without harming the environment is by converting these build-ups into value added items such as biovinegar. The objective of this work is to screen the fermentation parameter to identify the best condition and significant parameters affecting the fermentation. Five independent parameters were investigated, namely; temperature, fermentation time, addition of glucose, part and condition of waste. Fractional factorial design of Design Expert® software was used to investigate the effect of independent parameters as well as the interaction between parameters on the biovinegar production. The work was carried out by natural fermentation in which naturally occurred microorganism readily available on the raw materials (pineapple waste) was used. The result showed that the order of parameter significance in acid production was as follows: temperature > addition of glucose > fermentation time > part of waste > condition of waste. The interaction parameter of fermentation time and addition of glucose had the strongest effect on the acid production. The best fermentation condition was carried out using pineapple peel juice at 30 °C for 8 days in an anaerobic condition with 50 g/L glucose addition. Under these conditions, acid production was 1.12 % w/v in which acetic acid concentration was 0.94 % w/v. The product pH was recorded at 3.57. The product yield and productivity were recorded at 0.1699 g/g and 0.0489 g/L.h, respectively. Exploration on producing biovinegar using mixed strains and pineapple waste as substrate could be another way to reduce environmental pollution and at the same time turning this waste into value added product. Moreover, using the natural fermentation together with the carry over benefit of the pineapple benefitted the quality of produced biovinegar.
Mesoporous titania nanoparticles as photocatalyst for degradation of 2-chlorophenol
Authors: Jaafar N. F. , Marfur N. A.
Published: August 2021

Mesoporous titania nanoparticles (MTN) was successfully prepared by microwave-assisted menthod. The performance of MTN was compared with degussa P25 (commercial TiO2) on photocatalytic degradation of 2-chlorophenol (2-CP). Both catalysts were characterized by XRD, FTIR, UV-Vis DRS and surface area analysis. The characterization data indicated that MTN has higher surface area and lower particle size than P25. The 2-CP was successfully degraded completely under UV light irradiation despite of having a slightly higher band-gap value compared with P25. This study demonstrated that MTN shows a good potential as a photocatalyst.
Evolución y modelos de implementación de sistemas de gestión de continuidad del negocio
Authors: Becerra Acevedo Rocío , Benavides Muñoz John Richard , Camacho Camacho Hernando , Obando Claudia Janeth
Published: August 2021

El sistema de gestión de la continuidad del negocio (BCMS) es una herramienta que permite a las organizaciones prepararse para escenarios que afecten el normal funcionamiento de las mismas. En este proceso, se requiere una evaluación de impacto y valoración de riesgos, de tal manera que se identifiquen, establezcan y evalúen los planes de continuidad del negocio (BCP) para asegurar la disponibilidad de recursos y personal necesario. Este artículo analiza la evolución, los modelos de implementación de BCM y las estrategias para la gestión de riesgos asociados. Se realiza un estudio de 37 artículos relacionados con BCM, los cuales se analizan y se concluye que la evolución de la BCM ha permitido a las organizaciones acceder a modelos que facilitan la implementación de este sistema, acorde a las necesidades, disponibilidad de recursos, competencia del personal y con un enfoque PHVA (planear, hacer, verificar y actuar).
Metodología para la medición de la productividad en instituciones prestadoras de servicios de salud
Authors: Cadavid Hincapié Tatiana Carolina , Gómez Gómez Hernán Augusto , Hernández Cruz Harold Wilson
Published: August 2021

Se presenta un análisis de las diferentes metodologías descritas a nivel mundial para la medición de la productividad en el sector de la salud. Para ello, se desarrolla una revisión bibliográfica descriptiva a partir de literatura encontrada en bases de datos indexados y búsqueda iterativa. Como resultados, se encontró que las principales metodologías empleadas actualmente para la medición de la productividad y eficiencia son el análisis envolvente de datos (DEA) en combinación con otros métodos. Finalmente, se concluye que son varias las metodologías de medición descritas en la literatura y en cada una de ellas se encuentra la combinación de diferentes métodos y variables a evaluar, de acuerdo con el enfoque del investigador; sin embargo, se hace necesario el desarrollo de estudios adicionales en los que se aborden nuevas variables que influyen en el crecimiento y decrecimiento de la eficiencia y productividad, así mismo, su relación con la calidad en la prestación de los servicios en salud.
Effect of blend composition on characteristics and performance of Jatropha bio-epoxy/epoxy matrix in composites with carbon fiber reinforcement
Authors: Mohd Radzi Mohd Hafiezal , Abdan Khalina , Zainal Abidin Zurina , Md Deros Mohd Azaman , Zin Mohd Hanafee
Published: August 2021

Characteristics and performances of a blended jatropha bio-epoxy/epoxy as a matrix in carbon fiber reinforcement was studied. The amount of bio-epoxy was arranged from 0 wt%, 25 wt%, 30 wt%, 40 wt%, and 50 wt% of the total matrix. Several analyses were performed to characterize and observe their performance. Fourier transform infrared spectroscopy, thermal analysis, physical characteristics, flammability, and soil burial were conducted, as well as mechanical tests. The results showed that introducing bio-epoxy in the matrix changed characteristics and increased or decreased their performance. Blending more than 25 wt% of bio-epoxy led to improved thermal stability between 280 °C to 350 °C and better biodegradability. However, tensile and flexural strength as well as modulus of elasticity decreased once the proportion of bio-epoxy was greater than 25 wt%. The paper proposed an optimal amount of jatropha bio-epoxy so that an alternative biocomposite application could be introduced to minimize carbon footprint in the environment.
ANALYTICAL NONLINEAR-PROBABILISTIC MODEL OF THE EQUIVALENT ELECTRICAL RESISTANCE OF A LAYER OF METAL GRANULES
Authors:   Institute of Electrodynamics National Academy of Sciences of Ukraine Peremohy, 56, Kyiv, 03057, Ukraine, Zakharchenko S.M. , Shydlovska N.A. ,   Institute of Electrodynamics National Academy of Sciences of Ukraine Peremohy, 56, Kyiv, 03057, Ukraine
Published: August 2021

As a result of processing the experimental data, an analytical continuous nonlinear-probabilistic model of the equivalent electrical resistance of a layer of metal granules in the working liquid was created. It is described by four equations: the modified Gaussian distribution and the dependences on the instantaneous values of the discharge current in the layer of metal granules of the mathematical expectation, dispersion and correction coefficient of the range of its equivalent electrical resistance. Based on the form of the dependences obtained during the experiments and the physics of the processes that occur in this case, two main groups of analytical functions are considered that approximate the obtained dependences. Criteria and methods for finding the optimal values of their coefficients are described. The adequacy of the approximation of each of the three obtained dependences by several analytical functions was investigated, the optimal values of the coefficients of which were found by the described method. Analytical functions was compared, which approximate the dependence of the mathematical expectation of the equivalent electrical resistance of a layer of metal granules on the instantaneous values of the discharge current in it with the known nonlinear models of the resistance of such a medium. References 33, figures 3, tables 3.
EXPERIMENTAL STUDY OF A TEST SAMPLE OF A WIRELESS POWER TRANSFER FOR ELECTRIC VEHICLES
Authors:   Institute of Electrodynamics National Academy of Sciences of Ukraine Peremohy, 56, Kyiv, 03057, Ukraine, Pavlov V.B. , Podoltsev O.D. ,   Institute of Electrodynamics National Academy of Sciences of Ukraine Peremohy, 56, Kyiv, 03057, Ukraine, Pavlenko V.E. ,   Institute of Electrodynamics National Academy of Sciences of Ukraine Peremohy, 56, Kyiv, 03057, Ukraine
Published: August 2021

A prototype of a wireless charger of inductive type with serial resonance in the circuits of the transmitting and receiving coils has been developed and manufactured, and experimental studies of the efficiency of power transmission from an external source to a storage battery have been carried out. It is shown that the efficiency of the created sample takes values in the range 39% - 78 % and depends on the operating frequency and the distance between the coils. It is also shown that when using coils with an outer diameter of 500 mm, the positioning of these coils in the process of charging the battery at a distance of up to 10 cm does not lead to a significant decrease in efficiency. The experimental values of the efficiency are compared with the calculated ones obtained on a simplified model that takes into account only resistive losses in the coils, and it is shown that the experimental values of the efficiency are 15-20 % less than the calculated ones. References. 8, figures. 5, table 1.
ASYNCHRONOUS ELECTRIC DRIVE WITH REACTIVE POWER CONTROL
Authors:   Research and production enterprise ", Chepkunov R.A. ,   Electronics, LTD",   , Open Company, 69093, Rustavi str., 5, k. 204
Published: August 2021

The method of control of asynchronous electric drive, which based on measuring and control of reactive power of induction motor, is presented. It provides independence of magnetic flow of rotor from changes of induction motor parameters, uninterrupted diapason of regulation of speed including zero and fast regulation.
AUTOMATED DEVICE FOR MONITORING THE STATOR CORE OF POWERFUL TURBOGENERATOR
Authors:   Institute of Electrodynamics National Academy of Sciences of Ukraine Peremohy, 56, Kyiv, 03057, Ukraine, Levitskyi A.S. , Zaitsev Ie.O. ,   Institute of Electrodynamics National Academy of Sciences of Ukraine Peremohy, 56, Kyiv, 03057, Ukraine, Panchik M.V. ,   Institute of Electrodynamics National Academy of Sciences of Ukraine Peremohy, 56, Kyiv, 03057, Ukraine
Published: August 2021

A device for automated control by the stator core of a powerful turbine generator (TG) during assembly and pressing at the manufacturing plant is proposed. Using the device, places in the core with a weakened solidity are determined. For this, at N points evenly spaced along the cross section of the stator core, the specific pressing pressure of special plastic elements, which are installed in the control cells of the additional pressure ring of the press, on which the core is assembled, is measured. During pressing, the elements are deformed, and their deformation depends on the degree of core defect (decrease in solidity) in the zone of which they are located. The sample will be deformed less, located in the zone of the largest defect, and most of all - in the zone where the defect is minimal. The pressure is measured using a flat metal membrane with a rigid center on which strain gauges are located at selected points. It is shown that the relative deformations in a flat membrane, which are measured by strain gages, depend on the value of the specific pressing pressure. Analytical relationships between the relative radial and tangential deformations and the specific pressing pressure have been determined. References 20, figures 5.
Generating Subjective Theories After a Disaster: The Role of Personality
Authors: González Palta Ingrid , Castro-Carrasco Pablo , Cabrera Enzo , Jamet Paulina , Leal-Soto Francisco
Published: August 2021

The role of people's beliefs in their perception of disasters has been scarcely studied. In this study, we analyzed how people who experienced an earthquake and a subsequent tsunami employ subjective theories (ST) to explain their traumatic experience. This study aimed to interpret the explanations developed by a group of people about the earthquake and tsunami that took place in Chile in 2015.  Thirteen episodic interviews were conducted as part of a qualitative case study. The participants' theories were grouped into four categories: the impact of personality on one's reaction to hardships; the existence of a link between personality and coping styles; the limited influence of personality on one's way of coping with difficulties; and changes in personality after experiencing hardships. These findings are discussed analyzing whether the participants' explanations could foster personal growth and psychological well-being after the catastrophe.
 
How to cite: González-Palta, I., Castro-Carrasco, P. J., Cabrera, E., Jamet, P., & Leal-Soto, F. (2021). Generating Subjective Theories After a Disaster: The Role of Personality. Revista Colombiana de Psicología, 30(2), 13-26. https://doi.org/10.15446/rcp.v30n2.79061
Attitudes toward Learning English and Procrastination in Students from a Private Institution Specialized in Foreign Languages in the City of Lima-Peru
Authors: Marquina Luján Román Jesús , Huaire Inacio Edson Jorge , Horna Calderón Victor Eduardo , Villamar Romero Roger Maurice , Kishnani García Aakash
Published: August 2021

The current study has as its objective to analyze the relationship between students’ attitude towards learning English and  the procrastinating behavior at the academic level. Attitudes strengthen people’s motivation to learn a foreign language  (Delfín, 2007), and procrastination, which involves unjustified delaying of activities, causes negative consequences in  completing academic tasks postponement of responsibilities (Rodríguez & Clariana, 2017). The design was correlational,  and the sample consisted of 55 students learning English. The instruments were the Attitudes towards English language  learning questionnaire and the academic procrastination questionnaire. According to the results, evidence shows that  there is a positive median relationship between the variables, leading us to conclude that despite having positive attitudes towards learning English, procrastinating behavior does not diminish. The results of this study could be utilized in  bilingual programs, or those could also be utilized to implement curricula in language programs at schools or universities. The idea is that higher education institutions include, as mandatory, the instruction of English as a global language.
 
How to cite this article: Marquina Luján, R. J., Huaire Inacio, E. J., Horna Calderón, V. E., Villamar Romero, R. M., & Kishnani García, A. (2021). Attitudes toward Learning English and Procrastination in Students from a Private Institution Specialized in Foreign Languages in the City of Lima-Peru. Revista Colombiana de Psicología, 30(2), 27-39. https://doi.org/10.15446/rcp.v30n2.83678
Modelling of density of states and energy level of chalcogenide quantum dots
Authors: Ahamed M. Irshad , Ahamed Mansoor , Muthaiyan R.
Published: August 2021

Quantum dots (QDs) or semiconductor nanocrystals are luminous materials with unique optical properties that can be fine-tuned by varying the size of the material. Chalcogenide QDs show strong quantum confinements effects owing to the fact that the exciton Bohr radius is much larger than the particle size, and tunable energy bandgap leads to widespread technological interest in near-infrared optical devices. In this communication, one dimensional Cu2SnS3and PbSexS1-xQDs is modeled by a particle in a box model which was used to compute energies and density of states. The density of states and the energy level of QDs are determined as a function of the strengths of the potential walls of the inner box. The results exhibit that the density of states decreases exponentially with an increase in the energy level of QDs. The density of states at lower energy levels is more significant than what is observed in higher energy levels.
Cytomegalovirus infection in Guillain-Barré syndrome: a retrospective study in Brazil
Authors: Dourado Junior Mario Emilio Teixeira , Sousa Bruno Fernandes de , Costa Nathaly M. Coelho da , Jeronimo Selma Maria Bezerra
Published: August 2021

ABSTRACT Background: Guillain-Barré syndrome (GBS) is currently the most common cause of acute flaccid paralysis worldwide. Risk factors for GBS include previous viral or bacterial infections or vaccination. Recently, an outbreak of Zika virus led to an outbreak of GBS in Latin America, mostly in Brazil, concomitant to continuous circulation of dengue virus serotypes. However, there is no study about cytomegalovirus (CMV) infection as a risk for GBS in Brazil. Objectives: In this study, we report a series of cases of GBS with the aim of determining the prevalence of CMV and the characteristics associated with the infection. Methods: A cohort of 111 GBS cases diagnosed between 2011 and 2017 in Natal, northeastern Brazil, was studied. Presence of CMV IgM antibodies was determined by means of electrochemiluminescence. The analysis was performed considering CMV infection status and the clinical outcome. Results: We found seroprevalence of 15.3% (n = 17) for CMV. CMV patients were younger (26 vs. 40; p = 0.016), with no apparent gastrointestinal (p = 0.762) or upper respiratory infections (p = 0.779) or sensory loss (p = 0.03). They presented more often with a classic GBS sensorimotor variant (p = 0.02) and with a demyelinating pattern in electrophysiological studies (p < 0.001). Conclusion: In Brazil, the clinical-epidemiological profile of GBS associated with CMV infection is similar to that described in other countries. Better understanding of the relationship between infectious processes and GBS is a key component of the research agenda and assistance strategy for global health initiatives relating to peripheral neuropathic conditions.
Juliano Moreira: the black Brazilian who greatly influenced the modern school of Neurology in Brazil
Authors: Rosso Laura Motter , Brandi Ana Laura da Silva , Vieira Tais Cristóvão Martins , Rodrigues Edynara Lopes , Caminha Caroline da Silva , Maurício Vinicius Farias , Touguinha Liliane , Suwa Samuel Masao , Gomes Ingrid Lorena da Silva , Saute Jonas Alex Morales
Published: August 2021

Abstract Juliano Moreira was a black Brazilian physician, well recognized for his role in the foundation of scientific psychiatry in Brazil; however, little is known about his influences on modern Neurology. Our aim is to highlight Moreira’s importance in the field of Neurology and his role in the development of scientific and medical societies in Brazil. We describe his contributions from his doctoral thesis in 1891 to his 27-year tenure as the director of the National Hospice for the Insane. We also review Moreira’s role in the foundation of societies including the Brazilian Academy of Sciences and the first Brazilian journal dedicated to Neuropsychiatry, concluding that Moreira was one of the most important influential figures for the development of Neurology in Brazil. In addition to his influences on various medical fields, Moreira distinguished himself as an impactful citizen who fought against racist and xenophobic medical theories of his time.
Sofrimento Social de Trabalhadores Rurais Assentados na Contracorrente do Agronegócio, na Bacia do Juruena - MT
Authors: Pistório Bianca Vasquez , Leão Luís Henrique da Costa , Pignatti Marta Gislene
Published: August 2021

Resumo Este artigo trata da manifestação do sofrimento social de trabalhadores no processo de reconhecimento/titulação de terras em assentamento para agricultura familiar em meio ao latifúndio e a monoculturas de soja e algodão, configurações hegemônicas do agronegócio no estado de Mato Grosso, Brasil. Na sociedade contemporânea, o sofrimento social emerge como uma categoria importante na vida das pessoas em razão da impossibilidade de acesso a bens e serviços por uma parcela da população. No mundo rural, o sofrimento pode estar relacionado à perda dos meios de produção, condicionada pela posse da terra. Este trabalho estruturou-se em busca de compreender como esse sofrimento manifesta-se em um grupo de trabalhadores rurais assentados no município de Campos de Júlio. Com esse objetivo, foram entrevistados oito trabalhadores que possuíam lotes no Assentamento Rural Nova Esperança. As reflexões apontam para disputas na ocupação e uma luta pela terra acarretadas pela configuração do agronegócio local, conflitos que repercutem na subjetividade dos trabalhadores da agricultura familiar. Por outro lado, a luta pela terra gerou união entre membros do grupo como forma de resistência às pressões externas ao assentamento. Mesmo imersos em um ambiente estrutural de opressão e de negação, lograram desenvolver estratégias de defesa frente ao sofrimento social, que fortaleceram o grupo de trabalhadores assentados.
Práticas em Psicologia na Saúde Pública: Aproximando Cenários e Contextos
Authors: Signorini Taise , Ferretti Fátima , Silva Maria Elisabeth Kleba da
Published: August 2021

Resumo Este estudo teve por objetivo desvelar as práticas realizadas com foco na saúde pública durante a graduação em um curso de psicologia de uma universidade privada do interior do estado do Paraná. Trata-se de uma pesquisa qualitativa. A coleta de dados aconteceu por meio da análise documental do Projeto Pedagógico do Curso e dos planos de ensino das disciplinas que abordavam temas voltados à saúde pública, bem como por meio de entrevista semiestruturada com a coordenação e da realização de dois grupos focais: o primeiro, com nove professores psicólogos, e o segundo, com 12 estudantes. A análise de dados do material empírico das entrevistas e dos grupos focais se deu por meio da análise de conteúdo temática. Observou-se que a maioria das práticas na saúde pública é realizada nos estágios obrigatórios, seja ele em atendimento clínico individual ou em grupo, em visita domiciliar, em plantão psicológico, em trabalho em grupo, entre outras modalidades. Tal condição, de certa forma, diminui o número de vivências realizadas pelos estudantes ao longo da formação em Psicologia. É importante destacar que o curso apresenta algumas práticas consideradas inovadoras no campo da saúde pública, como o consultório de rua e o atendimento em sala de espera. Há que se ampliar, contudo, a articulação entre ensino e prática, pois os avanços precisam acontecer principalmente no sentido de abranger, desde a formação, práticas mais integralizadas, de modo a comportar o encontro com outras áreas de formação e prover uma perspectiva, de certa forma, mais articulada e multiprofissional.