bluuebunny/crossref_metadata_2025_split huggingface dataset:
Determination of Trace Amount of Iron with as-Triazine Containing Ferroin- Functional Group
Authors: Hossain Md Musharraf , Islam Md Anwarul , Begum Shahida , Parvin Maksuda 
Published: July 2021

The as-triazines containing iron(II) methine chromophoric group; 3-(2-pyridyl)-5,6-diphenyl-as-triazine (PDT), and 3-(2- pyridyl)-5,6-bis(p-methoxyphenyl)-as-triazine (PBMPT) have been prepared from commercially available relatively cheaper reagents. The absorptiometric characteristics of the iron(II) complexes with PDT and PBMPT have been re-evaluated. The interference of copper ion on the determination of iron with these selective reagents and its masking has also been studied. The application of these spectrophotometric reagents for determination of iron in water samples based on the formation of extractable PDT-iron(II) and PBMPT-iron(II) complexes in chloroform medium has been described. Standard addition technique was used to verify the reliability of the method. Repeated determinations gave results with a very small standard deviation.
Dhaka Univ. J. Sci. 67(2): 145-150, 2019 (July)
Effect of Heat Generation and Thermal Radiation on the Slip Flow of Time Dependent Elastico-viscous Maxwell Nanofluid Flow Over a Porous Stretching Inclined Surface
Authors: Samad M Abdus , Karim M Enamul 
Published: July 2021

The present paper deals with the numerical analysis of the combined effect of heat generation and thermal radiation on the flow of a time dependent elastico-viscous Maxwell nanofluid passing over a stretching porous inclined surface with slip boundary. Appropriate similarity transformations are used to decorate the governing equations into a set of ordinary non-linear differential equations. The coupled ordinary equations are solved numerically using the Nachtsheim-Swigert shooting method together with the Runge-Kutta iterative technique for various values of the flow control parameters. In addition, the built-in function bvp4c of MATLAB is used to enhance the consistency of numerical results. The numerical results, demonstrated graphically, are described from the physical point of view. Finally, the effects of relevant parameters on the local skin-friction coefficient, the local Nusselt number, and the local Sherwood number, which are of material concern, are demonstrated in tabular form.
Dhaka Univ. J. Sci. 68(1): 19-28, 2020 (January)
A Procedure for Scheduling Inventory of an Industry by Merging Forecasting and Linear Programming
Authors: Reza AKM Selim , Suraiya Sayma , Hasan M Babul 
Published: July 2021

In this paper, we develop a mathematical model combining forecasting and linear programming for a business organization of Bangladesh to calculate optimum order quantity and inventory cost. We test the model using raw data of the demand for the raw materials and spare inventory for the industry and find out minimum total inventory cost along with ordering cost and inventory holding cost. The developed model make a match between the forecasted demand of raw materials and spare inventory and the minimum total cost of inventory. Finally comparing minimum cost, we observe that our estimated appropriate forecasting method gives optimal inventory cost.
Dhaka Univ. J. Sci. 68(1): 65-70, 2020 (January)
The Impact of Cumulus Parameterization Schemes on the Simulation of Tropical Cyclone “Roanu” Over the Bay of Bengal Using WRF Model
Authors: Saifullah - , Ali Md Idris , Imran Ashik 
Published: July 2021

A sensitivity study has been made on cumulus parameterization (CP) schemes of Weather Research and Forecasting (WRF) model for the simulation of tropical cyclone Roanu which formed over Bay of Bengal during May 2016. The model was run for 72 hours with different CP schemes such as Kain–Fritsch (KF), Betts-Miller-Janjic (BMJ), Grell–Freit as Ensemble (GFE), Grell 3D Ensemble (G3E) and Grell–Devenyi (GD) Ensemble schemes to study the variation in track, intensity. The landfall position error is minimum for BMJ scheme but the time delayed only 1.5-5 hours for all schemes except GD scheme. The Root Mean Square Error (RMSE) and Mean Absolute Error (MAE) of minimum sea level pressure and maximum wind speed is smaller for BMJ, GFE, GD schemes. The RMSE-MAE of rainfall is minimum for BMJ and G3E schemes. Except GD scheme all the other schemes give the better result.
Dhaka Univ. J. Sci. 68(1): 87-94, 2020 (January)
On Effectiveness of Decomposition Methods to Generate Multivariate Normal Variates: A Comparative Study
Authors: Akter Syeda Fateha , Sajib Anamul Haque 
Published: July 2021

The multivariate normal density (MVN) is considered to be the underlying distribution of many observed samples in statistics for modelling purpose. Therefore, simulating sample from the MVN is required to verify the efficiency of the fitted model. Decomposition based approach is currently being used to simulate sample from MVN whose building block is Cholesky or eigen decomposition. Unfortunately, there is no concrete study in the literature so far regarding the efficient decomposition technique between these two1. In this paper, an attempt is made to determine the efficient decomposition technique between these two in the context of MVN generation through an extensive simulation study. From our simulation study, it is observed that in general the Cholesky decomposition is numerically faster than the eigen decomposition.
Dhaka Univ. J. Sci. 68(2): 117-120, 2020 (July)
Determination of Stability Constants of Iron(II) Complexes of as-Triazines Containing Ferroin-Yielding Chromogens
Authors: Islam Md Anwarul , Begum Shahida , Parvin Maksuda , Hossain Md Musharraf 
Published: July 2021

With the aim of determining stability constants of iron(II) complexes of 3-(2-pyridyl)-5,6-diphenyl-1,2,4-triazine (PDT), 3-(2-pyridyl)-5,6-bis(p-methoxyphenyl)-1,2,4-triazine (PBMPT) and 3-(2-pyridyl)-5,6-bis(4-biphenyl)-1,2,4-triazine (PBBT), these organic reagents were prepared from commercially available relatively cheaper reactants. The absorptiometric characteristics of iron(II) complexes of these organic compounds; λmax and molar absorptivity (€max) were determined. The composition and stability constants of these iron(II) complexes were determined by both molar ratio and Job’s continuous variation methods. The mean logK values for iron(II) complexes of PDT, PBMPT and PBBT were found 16.48, 17.48 and 15.54 respectively reflecting the formation of very stable complexes. These are well comparable with the reported values for the iron(II) complexes of 2,2’-bipyridine, 1,10- phenanthroline, Ferrozine and Ferene. Higher sensitivity and stability constant values reflects the possibility of application of these compounds as promising chromogenic reagents for iron determination.
Dhaka Univ. J. Sci. 68(2): 137-142, 2020 (July)
Committed Effective Doses Received by Occupational Workers Handling Radioisotopes (131I and 99mTc) at INMAS, as Assessed from Urine-Samples
Authors: Noor Yeasin , Ferdous Jannatul , Ahsan Naureen , Mollah Abdus Sattar 
Published: July 2021

This study estimates the potential health risks attributed to the internal contamination of occupational workers at the Institute of Nuclear Medicine and Allied Sciences (INMAS) located at Dhaka Medical College and Hospital, Dhaka, during nuclear medicine practices involving the radionuclides 131I and 99mTc, using in vitro methods from urine samples. A total of 55 urine samples from 6 occupational workers are collected over a period of about 11 months. These samples are analyzed using a High Purity Germanium (HPGe) detector coupled with a multichannel analyzer (MCA). The radioactivity of the isotopes present in each urine sample is measured based on the detector efficiency, and the committed effective dose due to each intake is calculated from this activity. The average annual doses of individual workers found in this study range from 4.57 × 10-5 mSv to 9.72 × 10-3 mSv. Although these doses are considerably below the International Commission on Radiological Protection (ICRP) recommended annual dose limit of 20 mSv, efforts to abide by the ALARA principle should continue.
Dhaka Univ. J. Sci. 68(2): 161-165, 2020 (July)
Integration of Building Information Modeling (BIM) and LEED for A Green Building Rating
Authors: Rahman Mizanoor , Mim Sohana Alam , Oshin Shamanta Azad 
Published: July 2021

Green building design and construction is a global demand to save this earth. Leadership in Energy and Environmental Design (LEED) is the world's most widely implemented sustainable building rating system. Building Information Modeling (BIM) technology assist to keep multi-disciplinary information into a single model, and it provides an ability to perform this research. The aim is to assess the pre-certification of a proposed residential building project in integration with BIM and LEED and find out the impact of cost for a green building project. A Prototype 3D model was developed by BIM technology for the LEED certification process. A total of 704 simulations was conducted by using Green Building Studio (GBS) tools. All simulation results were calculated based on nine categories of the LEED rating system. The results of this study indicate that the lifecycle cost can be reduced significantly for a high-performance green building despite of having a high initial investment cost.
Journal of Engineering Science 12(2), 2021, 47-57
Analysis of Magnetohydrodynamic Jeffery-Hamel Flow in a Convergent-Divergent Channel using Cu-water Nanofluid
Authors: Das Ashik Chandra , Nasa Qazi Novera Tansue 
Published: July 2021

The present study focused on the entropy generation as well as the heat transfer rate and velocity profiles of a nanofluid of the Jeffery-Hamel flow, especially for convergent-divergent channels. First, the governing dimensional partial differential equations have been transformed into a system of non-dimensional ordinary differential equations. The Power series method has been used to solve these non-dimensional governing equations and the Hermite-Pade approximation has been applied for analyzing them. The effect of various physical parameters such as channel angle, Reynolds number, Hartmann number, nanoparticle solid volume frictions and Eckert number have been investigated for the velocity profiles, heat transfer and entropy generation. Here, Cu has been used as the solid nanoparticle and water has been used as the base fluid. It is interesting to remark that the entropy generation of the whole system increased at the two walls and a significant effect could be noticed on the heat transfer rate and velocity profiles.
Journal of Engineering Science 12(2), 2021, 79-92
THE EFFECT OF OPERATING CASH FLOW, NET PROFIT, ROA AND ROE ON STOCK RETURN OF IDX
Authors: Sitorus Jessy Safitri , Siburian Ernika , Simbolon Yosevin , Naibaho Royto Enjelia br 
Published: July 2021

This research was conducted to determine the effect of Operating Cash Flow, ROA Net Profit and ROE on the movement of Stock Return, data or information obtained through financial statements. And the method of data collection is done with Purposive Sampling there are 21 companies in a period of 3 years, therefore the total sample of this study should be 63 samples. But because the data of this study using outliers then the total sample became 41. Then analyzed using multiple linear regression using SPSS 20 software. From this research, the researchers obtained results, namely: Operating Cash Flow, Net Income, and ROA individually had no significant effect on Stock Return. ROE individually affects and is significant to the Return of Shares. Operating Cash Flow, Net Income, ROA and ROE are simultaneously concurrently and significantly impacted on Stock Return. Keywords: Operating Cash Flow, Net Income, Return on Assets, Return on Equity, Share Return.
Щодо управління спроможностями забезпечення потреб збройних сил боєприпасами
Authors: Kosaretsky Yevhenii , Pavlikovsky Anatoliy , Hunbin Kostiantyn , Bondarenko Oleh , Lavruk Michael 
Published: July 2021

У статті здійснено аналіз завдань, що виконуються Збройними Силами України та заходів забезпечення боєприпасам Збройних Сил України в мирний і в воєнний час. Метою дослідження є аналіз відповідності між завданнями, що вирішують Збройні Сили України, та запасами боєприпасів, що призначені для забезпечення військ під час виконання ними завдань. На підставі систематизації літературних джерел та підходів до вирішення проблеми забезпечення Збройних Сил України боєприпасами з’ясовано, що за будь-яких умов обстановки Збройні Сили повинні забезпечити стримування збройної агресії проти України та надати їй відсіч, здійснювати охорону повітряного простору держави та підводного простору у межах територіального моря України у випадках, визначених законодавством України, а також брати участь у заходах, спрямованих на боротьбу з тероризмом. Методичним інструментарієм проведеного дослідження стали аналіз, синтез, декомпозиція, досвід ведення бойових дій на Сході України. У дослідженні розглянуті процеси набуття потрібних спроможностей забезпечення боєприпасами Збройних Сил України в мирний і в воєнний час. Запропоновані показники та критерії оцінки ефективності спроможностей забезпечення потреб Збройних Сил боєприпасами. Запропонована інформаційно-логічна модель процесу забезпечення Збройних Сил боєприпасами в мирний час і в воєнний час, яка дає наглядне уявлення співвідношення завдань, що виконуються Збройними Силами України та заходів забезпечення боєприпасам Збройних Сил України в мирний і в воєнний час. Модель доцільно застосовувати у підтримці прийняття рішень під час організації заходів забезпечення Збройних Сил боєприпасами. Результати проведеного дослідження можуть бути корисними для науковців та управлінців, які вивчають проблематику всебічного забезпечення боєприпасами Збройних Сил України під час проведення ними операцій зі стримування збройної агресії.
Cui tributum, tributu: Imunidade tributaria religiosa constitucional brasileira entre proteção, isonomia e abuso
Authors: Marques Francisco Junior de Oliveira , Nóbrega José Cândido da Silva , Mendonça Maria Lírida Calou de Araújo e , Bezerra Neto Francisco das Chagas 
Published: July 2021

O artigo analisa a imunidade tributária aplicada às entidades religiosas e seus limites. Os princípios constitucionais de liberdade religiosa e laicidade são os eixos garantidores e protetores do instituto jurídico da imunidade tributária das igrejas, corporificado no art. 150, VI, b e § 4 CF/88. Contudo, o mesmo instrumento de respeito e colaboração pode também ferir o princípio da isonomia e abrir espaço para abusos, desvio e crimes. Nesse contexto, a pesquisa faz uma reflexão histórica sobre a relação entre a religião e o dever de tributar, a evolução do constitucionalismo brasileiro quanto a imunidade religiosa, seu alcance e limites. Daqui emerge a pergunta: em que sentido a imunidade tributária religiosa pode ser fonte de proteção de direitos fundamentais e, ao mesmo tempo, ferir o princípio da isonomia, e facilitar abusos diversos? A metodologia é bibliográfica e documental, de caráter explicativo, qualitativa e de natureza teórica. Os resultados obtidos levam a concluir que a renúncia fiscal do Estado mediante a imunidade tributária religiosa pode apresenta-se de forma paradoxal, entre a proteção da liberdade religiosa e a promoção de abusos pela malversação das finalidades próprias das igrejas.
Patologias associadas ao desmame precoce: Como prevenir?
Authors: Santos Drielly Andrade , Bezerra Gleyce Kelly de Araújo , Barbosa Maria Suzane da Silva , Cunha Fabio Torres , Barbosa Silvia Mariana da Silva , Oliveira Danielle Cássia de 
Published: July 2021

Objetivo: Caracterizar as possíveis patologias associadas ao desmame precoce com a contribuição de uma má introdução alimentar nos últimos dez (10) anos. Metodologia: Trata-se de uma revisão bibliográfica, a busca do material foi realizada on-line em grandes bases de dados, como Lilacs, Pubmed e CAPES. Para seleção da amostra, utilizaram-se os critérios de inclusão: artigos on-line, disponíveis na íntegra, artigo completo, tese mestrado/doutorado, artigos gratuitos, publicados nos idiomas português e espanhol, no período entre 2010 e 2020 e que contemplassem o assunto escolhido a ser estudado. Resultado: As publicações selecionadas corroboram sobre os inúmeros benefícios do aleitamento materno na prevenção de doenças, nas diversas fases da vida infantil, relatam sobre os fatores que colaboram com o desmame precoce e sobre a má introdução alimentar. Considerações finais: Dentre os estudos, a maioria emprega que a introdução alimentar precoce está associada ao risco das crianças terem sobrepeso e obesidade. Ao longo do estudo houve diversas limitações na procura de artigos do devido tema, por isso é preciso ter mais estudos e pesquisas relacionadas a essa discussão.
Uma análise de consumo de alimentos probióticos com estudantes de uma instituição de ensino superior
Authors: Barros Vinicius Costa , Freitas Adriana Crispim de , Hunaldo Virlane Kelly Lima , Souza Iago Hudson da Silva 
Published: July 2021

Cuidados com a saúde e atenção aos hábitos de vida vêm ganhando atenção nesses últimos anos e a mudança nos hábitos alimentares apresenta-se em relevância, uma vez que à inserção de alguns alimentos podem ajudar na manutenção da saúde. Dentre esses alimentos estão em destaque os probióticos, que através da ação microbiana ajudam em atividades benéficas do sistema digestivo e imunológico. O objetivo desse trabalho foi investigar o conhecimento e comportamento de consumo de alimentos probióticos por estudantes de uma instituição de ensino superior e verificar o julgamento de uma proposta de intenção de compra de Kefir a base de albedo de maracujá. Os participantes da pesquisa foram 327 estudantes de uma Instituição de Ensino Superior que responderam um questionário online, divulgado nos grupos de WhatsApp e e-mails institucionais. As respostas obtidas foram tabuladas e analisadas de forma qualitativa e quantitativa. A maioria dos participantes da pesquisa (72,8%) estavam na faixa etária de 18 a 24 anos, onde 32,1% possuem renda entre R$ 1.100,00 e R$ 2.200,00, os participantes apresentam rotina sedentária, porém sem problemas de saúde. Parte dos estudantes definiram corretamente “alimentos probióticos”, possuindo hábitos de consumo semestral tendo como principal alimento de inserção e frequência o leite fermentado, e de maior preferência o iogurte. Os participantes não conhecem e nem consomem o produto Kefir, com preferência por alimentos funcionais a base de leite, levemente ácidos e estão abertos à proposta de compra de um Kefir a base de albedo do maracujá, sendo necessário o desenvolvimento do produto e testes sensoriais.
Evaluation of heated air jet on pulp chamber temperature at different steps of the restorative protocol
Authors: Andrade Bruna Souza , João Sheyla Adriane Rodrigues Oliveira , Matuda Larissa Sgarbosa de Araújo , Marsicano Juliane Avansini , Prado Rosana Leal , Pizi Eliane Cristina Gava 
Published: July 2021

Objectives: Evaluate of the heated air jet temperature (T) in the pulp chamber on cavity 5 depths and photoactivation stages for a bulk fill resin restorative protocol is evaluated. Methods: Class I cavity preparations were conducted at different depths (n = 8) through two protocols for adhesive volatilization (23 °C and 40 °C) and cavities were restored with the Filtek Bulk Fill resin. The pulp chamber temperature variation was evaluated at four steps (times) during the restorative protocol: I (initial), V (after volatilization), A (after photoactivation of the adhesive), and C (after photoactivation of the composite resin). To verify the assumptions of the normality of the errors and homoscedasticity, the Shapiro Wilk and Levene tests were conducted. Subsequently, two-way and three-way analysis of variance was carried out, followed by Tukey's post-hoc analysis (α = 0.05). Results: The maximum T at the different restorative steps, regardless of the volatilization protocol and cavity depth, was as follows: I (36.8 °C) = V (36.9 ºC) < A (37.2 °C) = R (37.8 ºC) (p <0.05). During V, a small greater variation was observed in pulp chamber temperature when dentin was volatilized at 40 °C (p <0.05) at very deep cavity depths (0.31 °C). The largest temperature variations (p <0.05) were observed during A (0.17–0.59 °C) and R (0.50–1.06 °C), reaching peak temperatures in the cavities.
SARS-CoV-2: Informações e impactos
Authors: Santos Gardênia Taveira , Araújo Joabe Lima , Sousa Lucas Aires de , Passos Ionara Nayana Gomes , Vieira Julia Augusto , Cruz Hugo Vitor Menezes , Rocha Lindalva de Moura 
Published: July 2021

Em Wuhan, China, no final do ano de 2019 ocorreu um surto de pneumonia viral de causa desconhecida, até que em 7 de Janeiro de 2020 foi identificado o agente etiológico desta doença pelo Centro Chinês de Controle e Prevenção de Doenças (CDC), em que se tratava de uma Síndrome Respiratória Aguda Grave por Coronavírus 2 (SARS-CoV-2) conhecida como coronavírus 19 (COVID-19). Esse vírus já infectou até o dia 01 de junho de 2021 cerca de 170.814.464 pessoas, levando 3.551.884 a óbito, além de gerar uma série de problemas sociais e econômicos no mundo. Assim, este estudo teve como objetivo documentar informações referentes ao SARS-CoV-2 contidas na literatura cientifica, bem como, os impactos gerados na sociedade pelo novo coronavírus. As buscas foram realizadas nas bases de dados: PubMed/MEDLINE, SciELO e BVS utilizando filtro de buscas de artigos a partir de Dezembro de 2019 a Maio de 2021, que são os meses que compreendem de estudos referente ao SARS-CoV-2. As buscas bibliográficas foram realizadas no mês de Maio de 2021 utilizando os descritores “COVID-19 and Impacts”, “COVID-19 and Information”, “Complication and COVID-19” e “COVID-19 and Fake News”. Foram levados em considerações apenas achados no idioma inglês (americano e britânico). Dessa forma, esperamos que este estudo reforce o conhecimento dos leitores com informações sobre a COVID-19 e seus impactos na sociedade, também se almeja mensurar e identificar o vasto material cientifico que já temos disponível na literatura.