bluuebunny/crossref_metadata_2025 huggingface dataset:
Age Estimation with Cemental Annulation Using Light, Phase Contrast and Polarized Microscopy
Authors: Pradeep L. , Kokila Ganganna , Gopinathan Pillai Arun , Guruswamy Shwetha , Nazir Salroo Humaira , Chatterjee Ananjan
Published: January 2021

Introduction:

In forensic science, the determination of age plays a vital role in the identification of bodies and persons associated with crimes. Teeth are frequently better conserved than any other human remains, so their use for identifying age at death is vital. The root portion of the teeth is covered by a thin calcified layer called cementum, the annulations of which is considered to be helpful in age estimation. The objective of the study was to ascertain and compare the accuracy and efficiency of age estimation between light, polarized, and phase-contrast microscopy in the ground and decalcified sections of the tooth stained with hematoxylin and eosin by light microscopy and picrosirius red (PSR) by polarized microscopy.

Materials and Methods:

Fifty extracted teeth were collected and stored in a solution of 10% formalin. The middle one-third portion of the root was used, later sectioned into two halves using carborundum disc. One-half of it was used to prepare ground sections, which was studied with light, polarized, and phase-contrast microscopy. The other half was decalcified with 10% formic acid, processed, and two sections of 5 -μm thickness were prepared. One was stained with PSR stain and the second section was stained with hematoxylin and eosin (H and E) stain, One was stained with PSR stain and the second section was stained with hematoxylin and eosin (H and E) stain. Statistical analysis was performed using Z-test and Karl Pearson's correlation coefficient.

Results:

No statistically significant difference was observed between actual and calculated age in the ground sections, while there was a statistically significant difference observed between actual and calculated age in decalcified sections stained with H and E and PSR. A strong positive correlation was observed between actual and calculated age by Karl Pearson correlation coefficient test.

Conclusion:

Cemental annulation and phase contrast microscopy can be reliably utilized in forensic science to establishing age, especially among young and middle age group individuals.
Knowledge and Attitudes Regarding the Self-Use of Pain Medications in Saudi Arabia
Authors: Magadmi Rania M. , Kamel Fatemah O. , Hagras Magda M. , Alhmied Hwraa I. , Aljumaiy Walla H. , Saqat Doaa F. , Magadmi Mawadah M.
Published: January 2021

Objective:

The objective of the study was to examine the knowledge and attitudes of the population in the Kingdom of Saudi Arabia regarding the use of over-the-counter (OTC) analgesics.

Methods:

A prospective cross-sectional study used an electronic survey questionnaire comprising 18 questions. An electronic survey was distributed through social networking sites during the period from November 1 to November 15, 2014, followed by data analysis.

Results:

Data from 1808 questionnaires were collected and analyzed. The results showed that 61% of the participants used analgesics without prescription; 67% used analgesics only for severe pain; 72% stated that analgesics could be administered with other medications; 68% reported that analgesics had an antipyretic effect; and only 1% reported that they had an anti-inflammatory effect. Further, 80% of the participants had the habit of reading drug product information and 77% were careful about the expiry date.

Conclusions:

The general population showed inadequate knowledge and attitudes toward OTC analgesics. Therefore, more programs to increase awareness and health education among patients are needed.
Исследование слабой разрешимости дробной альфа-модели Фойгта
Authors: Zvyagin Andrey Viktorovich
Published: January 2021

Работа посвящена исследованию слабой разрешимости альфа-модели для дробной вязкоупругой среды Фойгта. В данной модели реологическое соотношение Фойгта рассматривается с левосторонней дробной производной Римана-Лиувилля, что позволяет учитывать память среды. Также в данной модели память рассматривается вдоль траектории движения частиц жидкости, определяемой полем скоростей. В связи с недостаточной гладкостью поля скоростей и, как следствие, невозможностью однозначного определения траектории через поле скоростей для любого начального значения слабое решение изучаемой задачи вводится с использованием регулярных лагранжевых потоков. На основе аппроксимационно-топологического подхода к исследованию задач гидродинамики доказывается существование слабых решений изучаемой альфа-модели, а также устанавливается сходимость решений альфа-модели к решениям исходной модели при стремлении параметра альфа к нулю.
Библиография: 33 наименования.
Optimised Design of Mold for Vehicle Throttle Body Bracket Based on CAE
Authors: Xinjie Zhang
Published: January 2021

The throttle body bracket is a structure to support and fix the throttle body. Its quality not only affects the performance of the throttle body, but also affects the running performance of car. Excellent mould is important guarantee for quality of the throttle body bracket. In this paper, mould of vehicle throttle body bracket is taken as research object. Methods combining structural design, simulation analysis with optimization design are adopted. First, process and structure of the bracket are analysed. Three plate mould structure and single-impression layout are determined. Based on mould flow optimization analysis, gate type and location are selected, structural dimensions of forming parts are calculated to design the side core pulling mechanism, remoulding mechanism and cooling system. Simulation analysis for filling time, weld line location, cavitation, cooling effect and warpage deformation are carried out by CAE to realise the optimal design of mould for the throttle body bracket.
Performance and Emission Characteristics of SI Engine with Standard and Modified Piston with Turmeric Leaf Oil as Biofuel
Authors: P. Tardale Rahul , Suresh S. , Ramesh K.
Published: January 2021

Turmeric leaves are waste products after removing turmeric rhizome. In the present work, the oil was extracted from the leaves of curcuma longa by hydro distillation method. The extracted oil was studied for preliminary physicochemical and phytochemical tests. The phytochemical evaluation of the turmeric leaf oil indicates the presence of terpenes which was used to run two stroke and four stroke engines. Engine emits less harmful product with turmeric oil as compared to petrol. Hence, it has been concluded that the turmeric leaf oil can be used as an alternative biofuel for petrol. Theoretically, turmeric leaf oil properties are similar to that of petrol. By performing practical experiments on this oil using different types of piston head shapes and varying parameters, we came to know that this will fulfil all capabilities as a biofuel in IC engines. In the second part, the characteristics fuel properties of turmeric leaf oil and their blends with petrol in the proportion of 40:60 (B40) have been studied. In the third part, engine tests have been conducted on turmeric leaf oil blends with petrol oil and brake thermal efficiency, engine gas temperature and air fuel ratio were evaluated. The next part consists of exhaust emission tests such as CO and HC emission measurement with a five gas analyser.
Studies on Properties of Micro-Nano ZrO2 Particulate Metal Matrix Composites
Authors: Sharatha G.S. , Hiremath Niranjan , Manjunatha G. , Srinivas S.
Published: January 2021

A metal matrix composite (MMC) is a composite material with at least two constituent parts, one being a metal matrix and other is reinforcement. When at least three materials are present, it is called a hybrid composite. Aluminium is widely used in aerospace and automobile industries due to its low density and good mechanical properties, better corrosion resistance and wear, low thermal coefficient of expansion as compared to conventional metals and alloys. The aim involved in designing MMC materials is to combine the desirable attributes of metals and ceramics. This project is aimed at development of MMC having aluminium metal matrix with micro-nano particulate zirconium oxide reinforcement. Here aluminium (LM25) has been selected as base metal along with 12% ZrO2 (micro), 12% ZrO2 (nano) and 12% ZrO2 (6% micro + 6% nano) have been taken as reinforcements to produce MMC. The composite has been produced by liquid metallurgy technique (stir casting). The properties of chosen composite are compared with base metal for tension, wear, hardness, density and microstructure analysis. For the combination of Al-LM25 with 12% zirconium oxide (6% micro + 6% nano) the tensile strength (TS) and hardness had increased when compared to that of base metal and are between that of the micro and nano reinforced composite. The density of MMC cast is almost relevant to theoretical densities. For MMC, the wear rate increases for an increase in the speed for a given constant load and time. The microstructure study reveals that Al-LM25 and zirconium oxide have been distributed uniformly throughout the casting with less porosity.
Designer Solid Shims for Assembly of Advanced Carbon Composite Pre-preg based Aircraft Structures
Authors: Kumar Sanjay , Selvaraj P.
Published: January 2021

A modern combat aircraft uses considerable amount of advanced composite material in structure build for better flight performance, stealth requirement and higher payload. Combat aircrafts made using composite structure require large numbers of custom shims of various thickness and shapes throughout interface surface, which are presently prepared by suit on assembly process to fill gaps measured between sub-structure parts and skin. The scope of study is four plus generation combat aircraft like Indian Light combat aircraft. These gaps arise due to composite raw material characteristics, mould tool and manufacturing process which results in geometry variation. This research has focussed the delta wing integral fuel tank composite structure. However, these research findings can be applied in other wing shapes made by composite part within the scope. The shims, whether liquid or solid, are necessary to eliminate gaps, maintain structural performance and minimize pull-down forces required to bring the aircraft into engineering nominal configuration for aerodynamic efficiency. Customized shims amount to significant delays in production with much of the time being spent in the critical path of the aircraft assembly. In this research work, we present an alternative strategy for the use of designer solid shim, based on redesign of lay-up moulding tool (female type) and shims manufacturing with change in existing manufacturing value stream. The experimented method has reduced the manufacturing cost of wing assembly, shorten the shimming process cycle and improve the assembly efficiency, product quality and performance.
Development of Microwave Hybrid Heating Welded Joints of Inconel-600 Superalloys using Grey Relational Analysis
Authors: Arora Ravish , Kapoor Jatinder , Chandimal Sharma Rakesh
Published: January 2021

Inconel-600 superalloys have a number of applications in space and aerospace sector due to its unique characteristics of high strength at elevated temperature, low weight, corrosion resistance and high wear resistance. However, due to these characteristics, Inconel-600 superalloy poses challenges in joining. Therefore, an attempt has been made to resolve these issues using microwave hybrid heating (MHH). The characteristics of the constituents of MHH process have large impact on the welded jointâ€™s strength. This paper examines the impact of control parameters on the ultimate tensile strength (UTS) and percentage elongation (EL) of Inconel-600 plates, which are welded via MHH. Design of experiments was carried out in accordance with Taguchi L16 orthogonal array (OA), taking in consideration of filler powder particle size (FPS), susceptor and separator. Multi-performance features were optimized via the effective utilization of Taguchi-based grey relational analysis (GRA) approach. ANOVA results show that the predominating factor to govern the joint strength is FPS followed by the susceptor and separator. The validation experiments are performed on the predicted optimized setting of process parameters. First level of FPS (30Î¼m), second level of susceptor (Graphite) and second level of separator (SiC) were found as the optimized parametric settings.
Experimental and Numerical Validation of Unmanned Aerial Vehicle Structure Fabricated using Graphene based Polymer Matrix Composites
Authors: VijayKumar R. , Maharana S.K.
Published: January 2021

This paper describes the investigation of the polymer matrix composite laminate of epoxy resin systems and graphene oxide (GO) reinforced with glass fiber. The laminates of epoxy glass fiber reinforced with GO has been fabricated by hand layup method and the fabricated laminate is further cut into test specimens as per ASTM standards and tested for their strength and stiffness. As per the experimental studies, the strength to weight ratio is increased. An attempt has also been made to observe how the different volume addition (1.5%, 3%, 4.5% and 6%) of GO to epoxy matrix has affected the tensile strength, Youngâ€™s modulus and % elongation of the laminate made of composite. The outcome of the experimental characterization of the composites has encouraged further choosing epoxy / GO (1.5% by volume) towards fabricating a simplified version of UAV. Laminate code EPWM12, an epoxy / GO woven mat 12-layer composite, has the satisfying peak load carrying capacity as well as three-point flexural strength as opposed to other four materials considered in this study. The Monte Carlo simulation showed that likelihood of EPWM12 material being safe for UAV is 96%.
Thrust Augmentation of Single Cycle Pulse Detonation Engine using Nozzles
Authors: Dhama Sanjeevkumar , Jindald T.K. , Mangal S.K.
Published: January 2021

Pulse detonation propulsion systems have the potential to provide better performance with additional advantages such as considerably light in weight, cost effective and reduced complexity in comparison with other propulsion systems which are currently in use. These improvements are due to the high thermodynamic efficiency obtained because of constant-volume combustion. Pulse detonation cycle can be used for both air-breathing and rocket based systems. Present study investigates the effect of nozzles in various configurations. They are straight nozzle, conical and bell-shaped nozzles with varying length, divergent angles and area ratios on the thrust augmentation of Pulse Detonation Engine (PDE) test rig which was developed by research team at Punjab Engg. College (PEC), Chandigarh. It was found from the experiments that the conical nozzle with high divergent angle of 20Â° and high nozzle area ratio of around 23 increased the thrust to 14%. The bell shaped nozzle, with 20Â° angle of divergence and a nozzle area ratio of just around 7, produced 59.5% more thrust in comparison with baseline engine. The augmentation in thrust was found to be as high as 55% in comparison with straight nozzle. Divergent nozzles produced negative thrust with less divergent angle but gave an increment of 11.28% with high angle of divergence in comparison with a straight nozzle.
Leading Edge Shape Optimization of Whitcomb IL Airfoil in Transonic Flow Using a Multi-Objective Genetic Algorithm (MOGA)
Authors: Jiniraj R. , Logesh T. , Rajapatel D.
Published: January 2021

Leading edge shape optimization of transonic airfoils requires creating an airfoil surface that reduces the drag divergence due to transonic shocks by either delaying them or reducing their strength at a given transonic cruise speed while maintaining the lift. Aircrafts like Boeing 757, Airbus A300, Boeing 777 and McDonnell Douglas AV-8B Harrier II use Whitcomb IL supercritical airfoil for efficient aerodynamic performance in transonic conditions. This study employs a multi-objective genetic algorithm for shape optimization of leading edge of the Whitcomb IL airfoil to achieve three objectives, namely dilation of shock, reduction in leading edge radius and increment of lift at a given transonic Mach number and at the given AoA. The commercially available software ICEM CFD and Fluent are employed for calculation of the flow field using the RANS (Reynolds-averaged Navier-Stokes equations) in conjunction with a two equation turbulence model. It is shown that the (MOGA) Multi-objective genetic algorithm can generate superior airfoil compared with Whitcomb IL airfoil by achieving three objectives. The optimized airfoil configuration is validated by wind tunnel testing facility.
Effect of Inlet Plenum on Pressure Drop and Velocity in Fractal Micro Channels
Authors: Singh Gurjit , Sehagal S.S.
Published: January 2021

The computational analysis for micro channel flow in a branched network was investigated by three dimensional CFD approach. The effect of the change of Inlet Plenum (IP) size at a constant Aspect Ratio (AR) of the outermost channel on pressure drop in a fractal branched micro channel was performed. The properties are compared along a particular path and it was observed that the pressure drop along a bifurcated path has considerably less effect when compared to that of the outer most straight branched channel for a constant aspect ratio model. Pressure does not change significantly if we change the IP radius even when all other parameters are constant. Velocity in the inner channel after a straight run has reduced significantly even for same AR and Reynolds Number (Re). This leads to the conclusion that the IP size affects the velocity after the bifurcation.
Investigation of Reduction in Base Drag using Experiment and CFD at Subsonic Speed Regimes
Authors: Venkatramanan S. , Gudimella S.H. Gowtham , Thanigaiarasu S. , Anbarasi J. , Vijayaraja K.
Published: January 2021

Base drag, arising from flow separation at the blunt base of a body can be a sizeable fraction of total drag in the context of projectiles, missiles and after bodies of fighter aircrafts. The base drag is the major contribution of total drag for low speed regimes, flight tests have shown that the base drag may account for up to 50% of the total drag. Computational and experimental investigation for a hemispherical flight vehicle body of length 500mm and diameter 50mm was conducted for the purpose of investigating the base drag. Three case studies were conducted to investigate the properties of the flow field around the flight vehicle at different flow velocities of 20m/s, 30m/s and 50m/s at zero angle of attack (AoA). The three cases were (i) a flight vehicle with flat base configuration, (ii) a flight vehicle with a nozzle at the base and (iii) a flight vehicle configuration with a boat tail, Fig 1. Also, the three configurations were investigated at different AoA of -2ï‚°, 0ï‚° and +2ï‚°. The base drags for three configurations are calculated and the experimental results are compared with the CFD results.
A interface entre letramento acadêmico, prática de ensino e formação de leitores literários
Authors: Amado Deniz Costa , Silva Cícero Da , Melo Márcio Araújo de
Published: January 2021

Partindo da premissa de que a escrita no Ensino Superior é uma das preocupações no âmbito acadêmico, este trabalho objetiva analisar as potencialidades intrínsecas ao letramento acadêmico e como estas refletem no ensino da leitura e escrita e na formação de leitores literários na escola. Como questão norteadora, indaga-se: como o letramento acadêmico reverbera na prática de ensino (da leitura e da escrita) e na formação de leitores literários na escola? Para tanto, realizou-se uma pesquisa bibliográfica, de abordagem qualitativa. Conclui-se que o professor letrado academicamente tem possibilidades de se apropriar de estratégias pedagógicas que contribuem diretamente no processo de letramento, bem como na formação de leitores literários.
A relação entre o tempo e a linguagem em “A portrait of the artist as a young man”
Authors: Mendonça Junior Jorge Witt , Araujo Rosanne Bezerra
Published: January 2021

A obra analisada narra a história de Stephen Dedalus. A partir da perspectiva de evolução do personagem, propomos um estudo do romance enquanto gênero diferenciado no tratamento do tempo. Nosso objetivo: analisar como a linguagem cria uma camada para o desenvolvimento do personagem na estrutura temporal da obra, possibilitando o compartilhamento de uma experiência temporal pela linguagem. Por meio da comparação de trechos recortados do primeiro e do último capítulo, concluímos que para configurar o tempo na linguagem, o autor utiliza de recursos como os diálogos para desenvolver um “presente fictício” e modificações na linguagem representada dos personagens para criar uma atmosfera infantil e uma linguagem poética para Stephen. Assim, nos aproximamos de forma mais precisa da realidade da obra por meio de impressões subjetivas do personagem em diferentes momentos de sua vida – a saber, o desenvolvimento da narrativa da vida de Stephen segue pelo tempo em uma camada representada na própria estrutura linguística da obra.
Percepções de alunos com deficiência intelectual no ensino remoto
Authors: Medeiros Leonardo Rafael , Tavares Lázaro Rodrigues
Published: January 2021

O ensino remoto adotado em decorrência do advento da pandemia do novo coronavírus levou instituições escolares a repensarem suas práticas pedagógicas. No tocante ao ensino de pessoas com deficiência intelectual (DI), tendo em vista que suas dificuldades vivenciadas no cotidiano escolar podem ser potencializadas, a utilização de estratégias pedagógicas alternativas para promover a inclusão torna-se fundamental. Dessa maneira, este estudo apresentou um panorama da realidade de dois alunos com DI em relação às suas dificuldades, adaptações pedagógicas e apoio familiar para os seus estudos. Para tanto, foi realizado um estudo de contexto no intuito de fazer um levantamento das percepções desses estudantes sobre sua aprendizagem a fim de propor possíveis ações inclusivas frente ao ensino remoto. Além disso, uma estudante foi acompanhada ao longo de toda uma disciplina, levando-se em consideração os dados obtidos com a realização do estudo de contexto. Verificamos que as principais dificuldades encontradas pelos alunos eram relacionadas às habilidades de leitura e escrita e que esses entraves podem ser sanados a partir de um acompanhamento contínuo, bem como através da utilização de abordagens metodológicas diversificadas, priorizando o uso de imagens. Constatamos que um olhar diferenciado pelo professor e um diálogo constante com o aluno com DI desempenham um papel primordial para a efetivação da sua inclusão, oportunizando-se novas formas de apropriação dos conhecimentos e garantindo um ensino que atenda às suas necessidades.
Uso de sinais de pontuação na construção dos sentidos textuais
Authors: Da Silva Antonio Cesar , Silveira Maria Inez Matoso
Published: January 2021

O estudo sobre o uso dos sinais de pontuação na construção dos sentidos textuais aqui proposto reflete sobre a interferência desses recursos de escrita na marcação de posturas enunciativo-discursivas em textos jornalísticos. Observações feitas a partir do corpus analisado mostraram que alguns sinais de pontuação, em circunstâncias específicas de uso, não exercem função em relação à estrutura sintática do texto. A partir dessa constatação, investigaram-se as funções que determinados recursos de pontuação são capazes de promover num enunciado, uma vez que seria nula sua função sintática. A pesquisa fundamenta-se, principalmente, nos estudos de Catach (1994), Junkes (2002) e Dahlet (2006). O estudo caracteriza-se como uma pesquisa qualitativa baseada na análise de corpus, este, por sua vez, é constituído por fragmentos de textos jornalísticos recolhidos de portais digitais. Os resultados mostram o uso eficiente de pontuação assinalando posturas enunciativo-discursivas em fragmentos para os quais os aspectos puramente sintáticos não seriam efetivos nem produtivos.
NGHIÊN CỨU CÁC YẾU TỐ ẢNH HƯỞNG ĐẾN ĐỘ LOE MỐI HÀN CỦA MÁY UỐN, HÀN VÒNG THÉP DÂY TỰ ĐỘNG
Authors: QUANG CHÂU MINH , TRƯỜNG NGUYỄN ĐỨC , KHANG CHÂU CAO NGUYÊN
Published: January 2021

Trong những năm gần đây, vòng thép dây được sử dụng ngày càng rộng rãi. Các nhà máy, xí nghiệp sản xuất vòng thép dây đã áp dụng phương pháp hàn tiếp điểm để gia công sản phẩm này, nhưng chất lượng mối hàn và năng suất thấp.Bài báo này tập trung vào việc nghiên cứu các yếu tố ảnh hưởng chính đến độ loe mối hàn trên máy uốn, hàn vòng thép dây tự động. Nghiên cứu thực nghiệm và tìm được phương trình hồi quy mô tả ảnh hưởng của các thông số liên quan. Kết quả của quá trình nghiên cứu được thể hiện ở phần 3 trong bài báo này.
DESIGN AND CONTROL OF THE MULTI-PURPOSES MEDICAL BED WITH THE FUNCTIONS OF PREVENTING AND TREATING FOR PATIENTS
Authors: QUÂN VÕ TƯỜNG , NĂNG PHAN PHÁT , TÍN TRƯƠNG TRỌNG , RĨ VÕ THỊ , DŨNG PHẠM QUỐC
Published: January 2021

Medical beds are the specific type of beds that are mostly used for patients in some medical treatment regions, in hospitals and even though at the patients’ home. Nowadays, most of the medical beds are using have quite simple function as: helping the patients change their position from laying to sitting and vice versa. However, these type of medical beds have only the function to help patients to lay down and it does not have any more curing function or supporting the doctors to cure for patients. Therefore, this paper propose the new trend of research is the development of one medical bed that has the function of anti-ulcer for patients and also has the function to weigh the patients. The integration of these two functions in one medical bed will lead to great positive impact in curing for patients.
NGHIÊN CỨU CÁC THÔNG SỐ ẢNH HƯỞNG ĐẾN LỰC HÁI TRÁI CÀ PHÊ CỦA MÁY THU HOẠCH CÀ PHÊ TẠI TỈNH ĐẮK LẮK
Authors: QUANG CHÂU MINH , TIẾN NGUYỄN VÕ
Published: January 2021

Bài báo này trình bày nghiên cứu các thông số ảnh hưởng đến lực hái trái cà phê tươi của máy thu hoạch cà phê công nghiệp sử dụng rung động của các thanh hái. Căn cứ trên kết quả thực nghiệm trên thiết bị thí nghiệm kéo nén Instron 5544 Testing Machine để xác định được lực kéo đứt cuống trái cà phê tươi. Thiết kế, chế tạo mô hình hái trái cà phê dựa trên các yếu tố ảnh hưởng đến việc tạo ra lực hái. Đồng thời chế tạo một thiết bị đo lực để đo các lực được tạo ra trên mô hình máy hái cà phê. Trong quá trình thực nghiệm lần lượt thay đổi các thông số ảnh hưởng đến việc tạo ra lực hái cà phê. Thực nghiệm để xác định sự ảnh hưởng của các thông số này.
FACTORS AFFECTING TO SAFE FOOD PURCHASE INTENTION OF CONSUMERS IN CENTRAL DISTRICT OF HOCHIMINH CITY
Authors: GIANG PHẠM XUÂN , HÒA LÊ THANH
Published: January 2021

Foods not safe, are sold a lot in street small shops and vendor load. Food poisoning cases are still occurring, consumers of Hochiminh City increase purchase intention, then purchase decision to buy safe food. Basing on the survey of 230 consumers in some central districts of the city. The data was processed using SPSS 20. The study indentified seven factors affecting purchase intention to safe food consist of Attitudes towards the environment; Health consideration; Perceived prices; Perceived Quality; Product availability, Normative and Mass media. Accordingly, 7 managerial implications are derived from the research results. Hopefully, these implications, if implemented by businesses, will increase the purchase intention of safe food of the city residents.
THE IMPACT OF PERCEIVED RISK ON THE CUSTOMER’S ONLINE PURCHASING INTENTION IN HO CHI MINH CITY
Authors: KHOA BÙI THÀNH
Published: January 2021

Online shopping is the new trend of buying behavior, and it is blooming in the 21st century. There is no denying that the e-commerce brings many benefits for the consumers; however, there are many existing risks in online transactions. The previous researches proved that the perceived risk is one of the important factors which impact the buying behavior in both the traditional commerce and the electronic commerce. Based on the qualitative and quantitative research method, the research tests and concludes that the perceived risk based on the perception of the consumer in Hochiminh city included the product/service risk and transaction process risk, and the perceived risk will be a negative impact on the online purchasing intention of the customer. Besides that, some managerial implications for the online business are suggested in this paper to reduce the factors of perceived risk for increasing the customer’s purchasing intention.
ĐỔI MỚI PHƯƠNG PHÁP ĐÀO TẠO KẾ TOÁN BẬC ĐẠI HỌC PHÙ HỢP VỚI YÊU CẦU CẢI CÁCH KẾ TOÁN
Authors: VÂN CAO THỊ CẨM
Published: January 2021

Đổi mới công tác đào tạo kế toán là một yêu cầu cấp thiết của hầu hết các trường đại học tại nhiều quốc gia nói chung và tại Việt Nam nói riêng nhằm hướng tới việc cung cấp nguồn nhân lực chất lượng cao phù hợp với yêu cầu quản lý của nền kinh tế phát triển và hội nhập. Có thể thấy rằng, trong những năm qua, công tác đào tạo kế toán ở các trường đại học của Việt Nam đã có những chuyển biến tích cực, tuy nhiên không thể phủ nhận rằng vẫn còn khoảng cách khá lớn giữa yêu cầu của xã hội và chất lượng nguồn nhân lực được cung cấp. Do đó, công tác đào tạo kế toán cần phải được xem xét từ quan điểm đến phương thức thực hiện sao cho phù hợp với yêu cầu đổi mới. Trong phạm vi bài viết, trên cơ sở nghiên cứu thực trạng, người viết sẽ trao đổi một số ý kiến liên quan đến công tác đào tạo kế toán bậc đại học tại Việt Nam hiện nay.
TO BE AND HOW TO BE: INSIDES OF PROGRESS AND FAILURE IN LANGUAGE LEARNING
Authors: SA NGUYỄN TRƯỜNG
Published: January 2021

This study investigated deeply into what happened when a language learner made failure and success. The question is how and what learners do to make improvements and achievements and/or to turn their learning results worse. Adopting grounded theory methodology and ethnographic perspective with prolong observations and interviews as the basis of data collection and analysis, the researcher studied the learning stories of 8 participants in 24 months to build up a general formula explaining how improvements and achievements operate. Motivation and autonomy were classified as the two central and most stable constructs in a holistic model containing numerous changing affective factors. Results showed that it is not really because of any single change in any individual factor/construct, but the operation of this whole model shapes the success and failure in language learning.
A META-REVIEW OF MANAGEMENT INSIGHTS
Authors: NGUYEN NGOC-LONG
Published: January 2021

There are several overlaps in terms of management. Different books and different scientists approach different subsets of management definitions. This research has been carried out:First, through a series of literature reviews, to capture all aspects of the management term.Second, to shape a systematic relationship enough supporting the term ―management‖, in a hope that it will provide readers with the most optimal definition of management.Type of research: This is a meta-review research which investigates the insights of management via asystematically comprehensive review of management literature.Design/Methodology/Approach: The research is conducted with the whole review of existingtheoretical literature on management which has been mostly published in Management Science Journaland carefully selected qualified papers or book chapters from drives of typical stores such as Elsevier,Jstore, and so on.Findings: Literature review reveals that the management definition should cover both quantitative andqualitative aspects of management. The study has provided a comprehensive model of management andthe most complete definition of management ever.Originality: The research has given the findings of entirely sufficient aspects of management comprisingboth quantitative and qualitative facets and the mutual or causal relationships of synthesized terms.
INFLUENCES ON STUDENT CHOICE OF UNIVERSITY: EVIDENCE FROM VIETNAM
Authors: KHOI BUI HUY , ESANGBEDO MOSES OLABHELE
Published: January 2021

The purpose of this study was to identify the factors that influenced university choice in Vietnam. Survey data was collected from 167 students studying in Industrial University of HCM City, Vietnam. The research model was proposed from the study of university choice in the context of education in Vietnam. The reliability and validity of the scale were tested by Cronbach's Alpha, Average Variance Extracted (Pvc) and Composite Reliability (Pc). The analysis results of structural equation model (SEM) showed that the tested relationship between university choice and the four components of the University Choice included University Advertising, Student Expectation, Reference (Family and Friend) and University Reputation. Student Ability, University Characteristics and Enroll to university were not influenced University Choice of Student.
CORPORATE SOCIAL RESPONSIBILITIES AND CORPORATE FINANCIAL PERFORMANCE IN VIETNAM CONTEXT
Authors: ANH HO THI VAN , ANH PHAM TU
Published: January 2021

The paper aims to investigate the effects between corporate social responsibilities (CSR) and corporate financial performance (CFP) in Vietnam context. The author employs context analysis and multiple regressions in Stata software to examine two-ways positive relationship between CSR and CFP. The research is contingent on the database created by Tien, HV & Van Anh, HT (2017) that is revised by an increase in the number of observation variables for a period from 2012 to 2017 for 130 companies via their annual report. Preliminary result indicates that there is a signicantly statistical relationship between CSR and CFP.
PROFIL PEMECAHAN MASALAH MATEMATIS SISWA USIA 14-15 TAHUN DI BANDA ACEH
Authors: Sari Intan Kemala
Published: January 2021

Pemecahan masalah merupakan suatu proses psikologis yang melibatkan aplikasi dalil-dalil atau teorema yang dipelajari tetapi melibatkan aktivitas berpikir yang cukup kompleks. Dalam matematika, pemecahan masalah menjadi tujuan utama dalam belajar karena selain untuk mengukur prestasi belajarnya juga menjadi bekal dalam menjalankan kehidupan sehari-hari. Ada beberapa tahapan pemecahan masalah, diantaranya yang dikemukakan oleh Polya yaitu; (1) tahap memahami soal, (2) tahap membuat rencana penyelesaian, (3) tahap menerapkan rencana penyelesaian, dan (4) memeriksa/meninjau kembali. Berdasarkan pemaparan tersebut, maka tujuan penelitian adalah untuk mengetahui profil pemecahan masalah matematis siswa usia 14-15 tahun di Banda Aceh. Jenis penelitian ini adalah deskriptif, dengan pendekatan kualitatif dimana penelitian ini bermaksud untuk memahami fenomena tentang apa yang dialami oleh subjek penelitian secara holistik, dan dengan cara deskripsi dalam bentuk kata-kata dan bahasa, pada suatu konteks khusus yang alamiah dan dengan memanfaatkan berbagai metode alamiah. Sampel penelitian yaitu sebanyak 30 siswa usia 14-15 tahun. Pengumpulan data dilakukan dengan menganalisis jawaban siswa atas soal pemecahan masalah matematis. Terdapat empat soal bertingkat yang diberikan untuk melihat tahapan pemecahan masalah matematis siswa, dan dilakukan wawancara untuk mengkonfirmasi jawaban siswa. Berdasarkan pelaksanaan tersebut didapatkan hasil bahwa kemampuan pemecahan masalah matematis siswa usia 14-15 tahun berada pada level rendah, dimana presentasi kemampuan siswa menjawab dengan kategori baik berada pada soal nomor 1, sedangkan pada soal nomor 2, 3, dan 4, kemampuan siswa mulai menurun sehingga rata-rata kemampuan pemecahan masalah siswa masih relatif rendah. Dengan demikian dapat disimpulkan bahwa kemampuan pemecahan masalah matematis siswa usia 14-15 tahun di Banda Aceh masih rendah. Untuk meminimalisasi masalah tersebut maka disarankan untuk mengarahkan pembelajaran berbasis pemecahan masalah matematis dengan pemberian masalah-masalah matematis agar siswa terbiasa menghadapi soal-soal yang berbasis masalah dan pemecahannya menggunakan penalaran matematis.
Conceptual model of supply chain in risky environment: case study
Authors: Mensah Peter , Merkuryev Yuri , Pecherka Jelena , Longo Francesco
Published: January 2021

The supply chain faces uncertainties, especially with the flow of products and information that may affect the productivity, revenue and competitive advantages of many organizations. It is therefore necessary for these organizations to be agile and resilient enough to meet with these uncertainties so that they may be managed appropriately or even avoided. In a publication by Mensah et.al (2014), the authors introduce a theoretical approach where the „conceptualization of risks for subsequent simulation-based analysis‟ is evaluated. This includes the description of „a generic conceptual model of a retail node‟ followed by the introduction of performance indicators relevant for simulation base analysis. Hence, a concept for further studies from a practical point of view has now arisen. This article therefore introduces a new case study where the flow of products in a real company is conceptualized for simulation base analysis to raise the awareness of the organization in case of uncertainties.
An algorithm for the capacitated vehicle routing problem for picking application in manual warehouses
Authors: Bottani Eleonora , Casella Giorgia , Caccia Caterina , Montanari Roberto
Published: January 2021

Given that warehouses play a central role in modern supply chains, this study proposes the application of an algorithm for the capacitated vehicle routing problem (CVRP) based on the two-index vehicle flow formulation developed by Baldacci, Hadjiconstantinou, and Mingozzi (2004) for picking purposes in manual warehouses. The study of Theys et al. (2010) is first used to represent the warehouse using a Steiner traveling salesman problem (TSP). Then, a calculation of the picking tour’s length is obtained applying the Manhattan distance. Finally, the algorithm for the CVRP is solved through a cutting plane with the addition of termination criteria related to the capacity of picker. The study analyzes four different warehouse configurations, processing five picking list each. The analysis is carried out exploiting the commercial software MATLAB®, to determine the solution that minimize distance of the order picking tour. The results obtained in MATLAB® show the effectiveness of the chosen algorithm applied to the context of manual order picking.
A conceptual model for assessing the impact of Internet-of-Things technologies for people with reduced mobility in airports
Authors: Herrera Martín Juan José , Castilla Rodríguez Iván
Published: January 2021

The European Union has regulated by law the elimination of barriers to guarantee the right to free movement, freedom of choice and non-discrimination of people with reduced mobility (PRM). This regulation also affects air transport. More specifically, airports of the member states must offer a quality assistance service to PRM, with the adequate human and technical resources to guarantee their rights. The changing characteristics of the operation of an airport (delays, cancellations, breakdowns, etc.) add great complexity to the design and management of a PRM service. Internet of Things (IoT) technologies pose a unique opportunity to integrate new services and solutions to deal with these problems. This work focuses on the use of modeling and simulation techniques for the evaluation of the impact of the incorporation of new IoT-based elements (such as autonomous vehicles, smart devices and 5G-enabled systems), for the improvement of the PRM service.
DIABETIC JEOPARDIZE OF ACUTE MYOCARDIAL INFARCTION CHEST PAIN
Authors: Niazi Gul Zaman Khan , Ahmed Nisar , Masood Arslan , Akhtar Ammar , Saleemi Muhammad Sohail , Ahmad Ijaz
Published: January 2021

Objective: Diabetic neuropathy may mask the typical ischemic chest pain and diabetics may carry longer presentation times in cases of acute STEMI. Diabetics may complain of chest pain less frequently, while atypical clinical presentations of STEMI could be more common compared to non-diabetics. Aim of this study was to assess the potential impact of diabetes on STEMI related chest pain, its severity, characteristics and non-specific clinical features. Methodology: The descriptive, cross-sectional study included 254 patients with first episode of STEMI. Data was acquired regarding feeling of chest pain, its severity, different characters, sites of radiation, and occurrence of associated clinical features. These variables were compared among diabetic and non-diabetic groups by Pearson’s Chi-square test. Results: Diabetics were more likely ‘not to feel’ any STEMI related chest pain compared to non-diabetics (22.2% vs. 2.4% p<0.001), severe chest pain was a less frequent complaint in diabetics compared to non-diabetics (21.1% vs. 89% p<0.001). The characters of “chest tightness”, “strangulating pain” and “squeezing chest pain” were less frequent in diabetics (45.6% vs. 68.3% p<0.001, 8.9% vs. 56.7% p<0.001 and 1.1% vs. 18.3% p<0.001 respectively). Syncope and shortness of breath were observed more frequently in diabetics (37.8% vs. 20.7% p=0.003 and 23.3% vs. 17.1% p=0.001 respectively). Conclusion: Diabetics can frequently present without pain or with less severe chest pain and infrequent typical characters compared to non-diabetics and may have atypical symptoms like syncope and shortness of breath more commonly than non-diabetics.
RELATIONSHIP BETWEEN ANKLE BRACHIAL INDEX (ABI) AND CARDIOVASCULAR RISK FACTORS IN DIABETES TYPE II
Authors: Naveed Shabnam , Ali Zeeshan , Nageen Ayesha , Ahmed Syed Masroor , Fatima Marium , Zehra Fatima
Published: January 2021

Objective: Cardiovascular disease as a sequel of the phenomenon of atherosclerosis is significant reason of morbidity and mortality among population worldwide and ankle brachial index (ABI) is one very significant indicator of its happening. Thus to correlate ABI with risk factors is one step to prevent atherosclerotic phenomenon as a low value of ABI is an indicator of cardiovascular disease. The focus of this research is to find relationship between ABI and the risk factors that lead to cardiovascular disease. Methodology: The study was piloted at the Diabetes Clinic, Medical Unit III, Jinnah Postgraduate Medical Centre Karachi for a duration of six months from March 2019 to August 2019. It was a cross-sectional study. One hundred and twenty-one adult type 2 diabetic consecutive patients participated in the study. Results: Peripheral artery disease was present in 35(29%) patients among which 7(20%) were males and 28(80%) were females. (p=0.007). PAD was more frequent in middle age group and hypertensive patients. Patients with dyslipidemia and metabolic syndrome had a higher frequency of PAD. The PAD increased with duration of diabetes and a sedentary lifestyle. Smoking was not a very significant factor in PAD. The frequency of PAD rose with a higher BMI. Conclusion: The study concluded that there is a co-relation between a low ankle brachial index and risk factors like uncontrolled hypertension, an increased BMI, waist circumference or duration of diabetes, or the presence of dyslipidemia, metabolic syndrome or sedentary lifestyle.
NEW LEFT BUNDLE BRANCH BLOCK IN A PATIENT WITH COVID-19- CASE REPORT
Authors: Kinsara Abdulhalim Jamal , Batwa Faisal A. , Moeminkhan Hattan J. , Moeminkhan Heba J.
Published: January 2021

As more cardiovascular manifestations of COVID-19 are experienced, the body of knowledge related to the effect of COVID-19 on the cardiovascular system is expanding. We are presenting a unique case of acute coronary syndrome in a COVID-19 positive patient, who presented with an ECG consistent with left bundle branch block. The patient was considered for a percutaneous intervention versus fibrinolytic therapy. However, the patient returned to a normal QRS with no ischemic features. His troponin I was raised but an echocardiogram showed a normal ejection fraction without any regional wall motion abnormality. A watchful approach in COVID-19 cases may be a reasonable option.
Federally funded precious metals exploration in the 21st century: results and prospects
Authors: Ivanov Anatoly , Chernykh Alexander , Naumov Evgeny , Volchkov Alexey , Kulikov Danila , Khasanov Vladislav , Alekseev Yaroslav , Minkin Konstantin , Tarasov Alexander , Popov Ivan
Published: January 2021

The paper highlights the location of precious metal deposits within the Russian Federation planned for federally funded exploration within Russia and its subjects during 2003-2024, as well as its funding dynamics; it also presents resources approved as a result of exploration and shows federally funded exploration areas for the near term. The conclusion is validated that supporting gold production at the current level in the mid- to long-term requires both enhancing prospecting activities and launching federally funded forecasting-mineragenetic works to localize promising areas containing potential resources.
Structure and composition of picritic gabbro-dolerites of the Оctyabrskoye deposit central part
Authors: Nesterenko Maria
Published: January 2021

Issues relating to the genesis and deposit formation conditions in the Norilsk region are still debatable. At present, ore formation model in an open magmatic system is most popular. To study the actual process, the structure and composition of sulfide minerals in the Oktyabrskoye deposit central part were examined in two boreholes, RT-30 and RT-107, that reveal orebodies C-3 and C-4, respectively. Particular attention was paid to the structural patterns of disseminated ores in picritic gabbro-dolerites horizon. It has been established that sulfide inclusions are missing in the upper part of the horizon and their size and quantity gradually increase in depth, so that these inclusions grade into sulfide streaks in the lower part of the horizon. This indicates gravitational sulfide deposition in a closed magmatic system.
Geodynamics, diamondiferous system tectonics and minerageny
Authors: Baryshev Alexander , Khachatryan Galina
Published: January 2021

The paper presents a unique geodynamic evolution concept of all processes and structures ensuring carbon source formation and movement for diamond crystals growth in the mantle, and diamondiferous medium supply to the surface. Geodynamic basis for diamond formation is exogenetic source sinking in old subduction zones evolving along convection cell edges. The supply is ongoing in an advection system, with transtension combined with convection playing a key role. The paper shows periods of spatial pipe cluster location and tectonophysical pattern of this phenomenon. Based on geodynamics, the authors suggest improving a taxonomical scheme of the diamondiferous system due to its fractal structure, from a mineragenic province to a pipe cluster. Specific examples are presented to highlight major structural elements of diamondiferous taxons (systems) and their formation patterns. Debatable issues of kimberlite nature are discussed.