bluuebunny/crossref_metadata_2025 huggingface dataset:
Contribución de los datos genómicos en la definición de la composición racial de bovinos doble propósito
Authors: Rosero Alpala Jaime Anibal , Rangel Garcia Wilson David , Rojas Barreto Adonai , Burgos-Paz William Orlando
Published: February 2022

La heterosis animal es clave en la obtención de animales más productivos y mejor adaptados al trópico. Sin embargo, el inadecuado manejo genético conlleva a la obtención de mosaicos de razas que incluye la pérdida del potencial productivo del hato. El objetivo de este estudio fue definir la composición racial de bovinos mestizos doble propósito en el piedemonte Llanero departamento del Meta-Colombia. Un total de 126 individuos mestizos (MEZ) de seis hatos fueron evaluados por una aproximación fenotípica (APF) y una genotípica (ARG). Para ARG se incluyeron las razas control asociadas a Bos taurus taurus y Bos taurus indicus, para ello se genotiparon con un chip de GeneSeek GGP-LD de 26K de SNP y se analizaron mediante análisis de componentes principales (PCA) y asignación probabilística bayesiana de ADMIXTURE. Las agrupaciones raciales generadas por APF variaron respecto de ARG. El análisis molecular detectó siete (k= 7) grupos genéticos en la composición racial de los animales de estudio. Las tres razas con mayor participación en la composición racial de los individuos mestizos fueron: Holstein, Gyr, Brahman con 23.4, 21.4, y 21 % respectivamente, mientras que las restantes Blanco Orejinegro, Pardo Suizo, Normando y Jersey no superaron el 13 %.  A diferencia de APF, la aproximación ARG permitió de forma efectiva la identificación de la composición racial de bovinos mestizos y suministró información clave en miras de desarrollo de programas de apareamiento que buscan mejorar indicadores productivos, y a su vez propendan por la adaptación de los animales requisito indispensable para los sistemas bovino doble propósito.
Ataxia enzoótica por deficiencia de cobre en ciervo rojo (Cervus elaphus) cautivo en Colima, México
Authors: García-Márquez Luis Jorge , Ramírez-Romero Rafael , Martínez-Burnes Julio , López-Mayagoitia Alfonso , Ruíz-Ramírez Johnatan Alberto , Loman-Zúñiga Edgar Iván , Constantino-Casas Fernando
Published: February 2022

El objetivo del trabajo fue describir un caso de ataxia enzoótica en un Cervus elaphus (ciervo rojo) cautivo asociado a deficiencia de cobre, en el estado de Colima, México. En julio y octubre del 2018 dos hembras de ciervo rojo de 3 y 7 años manifestaron incoordinación con debilidad de los miembros posteriores y se estableció un diagnóstico anatomopatológico de ataxia progresiva. En septiembre del 2019 una hembra de 13 años manifestó signos nerviosos similares a los casos del 2018, por lo que se tomó una muestra de sangre para la medición sérica de cobre. Al animal se le aplicó eutanasia para su examen post mortem y se recolectaron muestras de tejido para histología, también se tomaron muestras de hígado, riñón, forraje y suelo para la medición de cobre y molibdeno. Las principales lesiones se encontraron microscópicamente en medula espinal, que mostró leucomalacia, desmielinización, cuerpos esferoides y cromatolisis neuronal. La concentración de cobre fue 2.7 en hígado, 4.67 en riñón y 0.08 en suero (mg/kg MS o ppm). La relación Cu:Mo para el suelo 1 fue Cu 8.48; Mo 3.00; Cu:Mo 2.83:1, suelo 2: Cu 9.10; Mo 3.00; Cu:Mo 3.03:1. Forraje 1: Cu 6.59; Mo 7.35; Cu:Mo 0.90:1; forraje 2: Cu 2.77; Mo 6.12 ± 0.61; Cu:Mo 0.45:1. Los signos clínicos, lesiones microscópicas y los niveles bajos de Cu en suero, hígado y forrajes son consistentes con ataxia enzoótica por deficiencia primaria de cobre. Hasta donde se conoce, este es el primer informe de ataxia enzoótica en un ciervo rojo cautivo en México.
GENESIS TOWER OF BABEL
Authors: Bakhtiyarov K. I
Published: February 2022

The main thing is to understand the binary paradigm. At the base of the tower are 4 orthogonal phases of genesis: 00, 01, 11, 10. A model of consciousness with triads of lower and upper registers is constructed. Changes in lowercase cause changes in uppercase. The introduction of the upper digital register allows you to build a METALOGIC that clearly demonstrates fractality.
Intrdetrusor Botulinum Toxin A injection for Long-Term Indwelling Catheter Complications
Authors: Khafaji Ibrahim Al , Burns Emily , Abusada Ehab , Hashimi Hajir Al , Abed Omar Al-Mula
Published: February 2022

Background

Botulinum toxin was first described in 1895. It is a potent neurotoxin released by clostridium, a gramnegative, anaerobic, rod-shaped bacterium. Initially, it was considered to be the cause of life-threatening disease. However, research demonstrated it to be a novel and effective therapy in managing a range of diseases, including some that affect the urinary bladder. It was approved by the Food and Drug Administration (FDA) in 1898.

Objectives

This study aimed to evaluate the long-term effects of intravesical botulinum toxin A (BTA) injections in patients with an indwelling long-term catheter for detrusor overactivity. The patients selected for this study were experiencing significant catheter-associated symptoms such as bypassing, bladder spasms, intractable pain, blockages, and recurrent infections.

Method

A retrospective cohort study was conducted in patients that received intravesical BTA after the failure of symptom management using oral anticholinergic and beta 3-adrenocepter agonist. A group of 12 patients was identified, and they were followed up in the clinic after receiving treatment.

Results

All of the patients included in this study had relief of their symptoms following administration of intravesical BTA. Almost 58% (n = 7) of patients required 3 or fewer treatments with BTA to gain symptom control, with the remaining patients gaining control after 4 treatments. There were no significant adverse events reports with only mild and temporary side effects, such as haematuria, experienced.

Conclusion

This study demonstrated that intravesical BTA can significantly improve symptoms associated with longterm indwelling catheters and may help avoid more complex and invasive interventions.
Lucidez diante da barbárie
Authors: Süssekind Pedro
Published: February 2022

Para comentar o ensaio "Primo Lévi, razão, narração, lacunas”, de Jeanne Marie Gagnebin, exploro a herança iluminista do narrador sóbrio e meticuloso de É isto um homem? e proponho uma aproximação entre esse livro e Dialética do esclarecimento, de Adorno e Horkheimer. Considero que as duas obras, publicadas em 1947,  logo após o fim da II Guerra Mundial, lidam com uma questão histórica subjacente: Como o projeto europeu das Luzes, que levou à queda do Antigo Regime e fundamentou as constituições dos Estados democráticos modernos, pode ter resultado no totalitarismo, no fascismo, na barbárie?
Competitiveness of Rural Enterprises Run by Millennials in Antioquia
Authors: Arias-Vargas Francisco Javier , Ribes-Giner Gabriela , Garcés-Giraldo Luis Fernando , Arango-Botero Diana María
Published: February 2022

Business competitiveness is defined as a company's capacity to participate in the market with an competitive advantage. It can be analyzed using different approaches such as the Resource-Based View (RBV) and measured from a multidimensional perspective. This paper aims to examine the competitiveness of rural enterprises run by a millennial population consisting of undergraduate students and graduates from different faculties of agricultural sciences in Antioquia (Colombia). A total of 1242 emails were sent asking to fill out an online questionnaire, and 432 people responded (34.78 %), with 11.91 % already having a business in operation (148 enterprises). Once the competitiveness index was calculated, a multidimensional statistical analysis was performed to identify differences between regions, economic sectors, status (formal or informal), number of employees, and age of the company. According to the results, service companies in rural areas, enterprises registered at the chamber of commerce, and those with a higher number of employees and longer time in the market exhibit a better competitiveness index. The main limitations, however, are observed in the competitive strategy and marketing components. Since the competitiveness index can have a maximum value of 10, values in the range of 5.68 to 6.79 indicate a medium level of competitiveness and, therefore, imply that the other components of the competitiveness index must be improved to achieve higher levels of competitiveness.
Analisis Korelasi Sikap Ilmiah dan Hasil Belajar Biologi
Authors: Nasrul Mustain Muhammad , Hirza Bonita , A Siroj Rusdy
Published: February 2022

This study intends to provide information: (1) the level of scientific attitude ability of Biology students (2) the level of learning outcomes of Biology lessons (3) see the relationship between scientific attitudes and learning outcomes in Biology. The type of research was correlation research. The research population was all high school students in Ogan Komering ilir district, which is taken 30% of the sample area so that 5 districts represent the population. The sample technique used is perposive sampling with a total of 1827 students and the instruments used are scientific attitude questionnaires and odd semester test scores for the 2020/2021 school year. The results showed ((1) students' scientific attitude obtained an average score of 89 in the medium category, (2) cognitive learning outcomes of Biology students obtained an average score of 82 in the medium category, (3) There was a significant relationship between scientific attitudes and cognitive learning outcomes in Biology lessons with a relationship level of 0.655 including a "strong" correlation.
Abstrak. Penelitian ini bermaksud untuk memberikan informasi: (1) tingkat kemampuan sikap ilmiah siswa pelajaran Biologi (2) tingkat kemampuan hasil belajar pelajaran Biologi (3) melihat hubungan antara sikap ilmiah dan hasil belajar pelajaran Biologi. Jenis penelitian ini adalah penelitian korelasi. Populasi penelitian adalah seluruh siswa Sekolah Menengah Atas di kabupaten Ogan Komering ilir, yang diambil 30% dari sampel wilayah sehingga 5 kabupaten mewakili populasi. Tekhnik sampel yang digunakan adalah perposive sampling dengan total siswa adalah 1827 siswa dan instrumen yang digunakan adalah kuisioner sikap ilmiah dan nilai ulangan semester ganjil tahun ajaran 2020/2021. Hasil penelitian didapatkan bahwa; (1) sikap ilmiah siswa memperoleh skor rata-rata sebesar 89 dengan kategori sedang, (2) Hasil belajar Kognitif siswa pelajaran Biologi memperoleh skor rata-rata sebesar 82 dengan kategori sedang, (3) Terdapat hubungan signifikan antara sikap ilmiah dengan hasil belajar Kognitif pelajaran Biologi dengan tingkatan hubungan sebesar 0,655 termasuk dalam korelasi “kuat”.
Analisis Keterampilan Mengajar Guru IPA Pada Masa Pandemi Di SMP Islam Terpadu Se-Kota Palembang
Authors: Rohima Rohima , Wardhani Sri , S.W. Sumah Astrid
Published: February 2022

This study aims to determine the teaching skills of science teachers during the pandemic at the Integrated Islamic Junior High School in Palembang City. This research was conducted at SMPIT Bina Imi and SMPIT Al Furqon Palembang. The method in this research is qualitative descriptive. The data in this study were obtained using observation sheets, questionnaires and interviews. The results of this study are (1) In the skills of opening and closing lessons the teacher often does not convey the learning steps and sometimes conclusions are also missed due to lack of time. (2) In the skill of explaining the teacher's voice sometimes falters due to signals. (3) The questions asked by the teacher are still basic questions, not follow-up questions. (4) In class management skills the teacher can control the class to be more conducive but distractions during zoom can disturb the teacher's concentration. (5) Small group guiding skills and individual teaching skills are difficult for teachers to do in online learning. (6) Obstacles that are often found in online learning include unstable provider signals, limited time in teaching, student delays in class, students who do not turn on the camera while zooming in, teaching materials that are less varied.
Abstrak. Penelitian ini bertujuan untuk mengetahui keterampilan mengajar guru IPA pada masa pandemi  di SMP Islam Terpadu Se- Kota Palembang. Penelitian ini dilakukan di di SMPIT Bina Imi dan di SMPIT Al Furqon Palembang. Metode dalam penelitian ini adalah deskriptip kualitatif. Data dalam penelitian ini di dapatkan dengan menggunakan lembar observasi, angket dan wawancara. Hasil penelitian ini adalah (1) Pada keterampilan membuka dan menutup pelajaran guru sering tidak menyampaikan langkah-langkah pembelajaran dan kadang-kadang kesimpulan juga terlewat karena kurangnya waktu. (2) Pada keterampilan menjelaskan suara guru terkadang terputus-putus dikarenakan sinyal. (3)Pertanyaan yang diajukan guru masih berupa pertanyaan dasar bukan pertanyaan lanjutan. (4) Pada keterampilan mengelolah kelas guru bisa mengontrol kelas menjadi lebih kondusif tetapi gangguan pada saat zoom dapat mengnggu konsentrasi guru. (5) Keterampilan membimbing kelompok kecil dan keterampilan mengajar perorangan sulit dilakukan guru pada pembelajaran daring. (6) Kendala yang sering ditemukan pada pembelajaran daring diantaranya sinyal provider yang tidak stabil, keterbatasan waktu dalam mengajar, keterlambatan siswa masuk kelas,  siswa yang tidak menyalakan kamera saat zoom berlangsung, bahan ajar yang kurang bervariasi.
História da obesidade no cinema
Authors: Santolin Cezar Barbosa , Rigo Luiz Carlos
Published: February 2022

O objetivo deste artigo foi analisar A luta dos sexos (1928), de D. W. Griffith, como uma fonte primária da história da obesidade no cinema. Metodologicamente, utilizou-se análise discursiva da enunciação numa perspectiva foucaultiana. As análises permitiram constatar a importância que a questão da obesidade e da circunferência abdominal assumem na trama. Ambas são tornadas simbólicas e os novos valores, retratados negativamente, como uma ameaça, indireta, à integridade das famílias. Consequentemente, a barriguinha e a pouca importância dada pela esposa e pelos filhos devido ao amor verdadeiro que sentem pelo marido/pai se tornam símbolos de boa paternidade, de fidelidade e da integridade familiar. Conclui-se que o filme é uma peça importante na história da obesidade tanto porque Griffith foi um dos cineastas mais importantes da história do cinema e esse um dos seus filmes mais famosos quanto pela raridade da formação discursiva.
desporto inadequado à natureza feminina
Authors: Da Silva Joana Caroline Corrêa , Capraro André Mendes
Published: February 2022

Quando comparamos temporalmente os marcos no desenvolvimento do futebol feminino e do masculino, podemos notar diferenças com origens para além dos gramados. Na tentativa de compreender melhor o fenômeno do futebol feminino, este artigo descreve e analisa a sua trajetória no Paraná até 1951. Para isso, foram utilizados alguns periódicos da hemeroteca digital brasileira e quatro telegramas encontrados no Arquivo Público do Paraná acerca de um pedido de autorização para realização de uma partida de futebol feminino em Curitiba. Após analisar as fontes, constatou-se que o futebol de mulheres esteve ligado a práticas artísticas a partir de 1934, e que seu ineditismo como esporte no Paraná aconteceu em 1951 no estádio Durival de Britto e Silva com as equipes gaúchas Amazonas e Tiradentes, em um contexto de imposições, contradições e desobediências civis.
Corporate governance mechanisms and earnings quality: Is firm size a moderation variable?
Authors: Solikhah Badingatus , Wahyudin Agus , Al-Faryan Mamdouh Abdulaziz Saleh , Iranda Nadia Novita , Hajawiyah Ain , Sun Chia-Ming
Published: February 2022

The main objective of this research is to analyze the influence of independent commissioner, audit committee, managerial ownership, and institutional ownership on earnings quality. This study also observes the role of a firm’s size as a moderating variable. Using specific considerations, the number of the sample is reduced to 20 out of 144 companies from manufacturing companies listed in the Indonesian Stock Exchange during 2013–2016. The data analysis in this research used moderating regression. The results show that managerial ownership affects positively toward quality of the earnings. The firm’s size has proven to be able to strengthen the influence of managerial ownership and institutional ownership on earnings quality. Overall, this study reveals that the implementation of good corporate governance has been obliged by the government, but the supervisory function has not been executed optimally so it is not fully able to affect earnings quality. The results of this study contribute to both investors and potential investors in investment decisions. This paper suggests considering managerial and institutional ownership and company size since the variable is proven to be able to improve earnings quality.
A surgical treatment for frank rupture of acute type A small intramural hematoma
Authors: Ueda Daisuke , Niwa Kosuke , Nishikawa Hiroshi , Tsuchida Yasuaki , Yamashita Keigo
Published: February 2022

A 71-year-old woman was admitted to the hospital due to cardiac
tamponade. Computed tomography revealed that the diameter and wall
thickness of the ascending aorta was 36 mm and 9 mm, respectively. An
emergency surgery was performed uneventfully. The pathological findings
indicated frank rupture of intramural hematoma.
Mode of Conception and Risk of Spontaneous vs. Provider-Initiated Preterm Birth: Population-based cohort study
Authors: Wang Yimin , Ray Joel , Pudwell Jessica , Gaudet Laura , Peng Yingwei , Velez Maria
Published: February 2022

Objective: To study the association between mode of conception and risk
of preterm birth (PTB), including, spontaneous and provide-initiated
PTB. Design: Retrospective cohort study Setting and Population:
Population-based cohort included all singleton livebirths and stillbirth
in Ontario, Canada, 2006-2014. Methods: Mode of conception comprised (i)
subfertility without infertility treatment (N = 68,822); (ii)
non-invasive infertility treatment (ovulation induction +/- intrauterine
insemination) (N = 9024); or (iii) Invasive infertility treatment (in
vitro fertilization [N = 8038) – each compared to births by
unassisted conception (N = 646,926). Modified Poisson regression
generated risk ratios (RR). Confounding was handled by inverse
probability of treatment weighting using a propensity that included
maternal demographics and pre-existing conditions. Main Outcome Measure:
PTB < 37 completed weeks’ gestation. PTB was further
categorized as spontaneous PTB or provider-initiated PTB. Results: PTB
occurred among 6.0% of births by unassisted conception, 7.7% with
subfertility, 8.0% with non-invasive infertility treatment, and 10.8%
following invasive infertility treatment. The RR of provider-initiated
PTB was higher in women with subfertility (RR 1.23, 95% CI 1.16-1.31),
non-invasive infertility treatment (RR 1.48, 1.29-1.69) and invasive
infertility treatment (RR 2.35, 2.09-2.64) – each relative to births by
unassisted conception. The corresponding RR for spontaneous PTB were
1.15 (95% CI 1.10-1.19), 1.19 (95% CI 1.09-1.31) and 1.40 (95% CI
1.27-1.53). Conclusions: Subfertility, and receipt of infertility
treatment, are each associated with a higher risk of PTB, especially
provider-initiated PTB. Strategies are needed to reduce the underlying
indications to deliver these women before term.
Comparative Safety of Sodium–Glucose Cotransporter 2 Inhibitors Versus Dipeptidyl Peptidase 4 Inhibitors and Sulfonylureas on the Risk of Diabetic Ketoacidosis
Authors: Dawwas Ghadeer K. , Flory James H. , Hennessy Sean , Leonard Charles E. , Lewis James D.
Published: February 2022

OBJECTIVE

To assess the association of sodium–glucose cotransporter 2 (SGLT2) inhibitors with diabetic ketoacidosis compared with dipeptidyl peptidase 4 (DPP-4) inhibitors and sulfonylureas in patients with type 2 diabetes.

RESEARCH DESIGN AND METHODS

We conducted a new-user active comparator cohort study to examine two pairwise comparisons: 1) SGLT2 inhibitors versus DPP-4 inhibitors and 2) SGLT2 inhibitors versus sulfonylureas. The main outcome was diabetic ketoacidosis present on hospital admission. We adjusted for confounders through propensity score matching. We used Cox proportional hazards regression with a robust variance estimator to estimate hazard ratios (HRs) and corresponding 95% CIs while adjusting for calendar time.

RESULTS

In cohort 1 (n = 85,125 for SGLT2 inhibitors and n = 85,125 for DPP-4 inhibitors), the incidence rates of diabetic ketoacidosis per 1,000 person-years were 6.0 and 4.3 for SGLT2 inhibitors and DPP4 inhibitors, respectively. In cohort 2 (n = 72,436 for SGLT2 inhibitors and n = 72,436 for sulfonylureas), the incidence rates of diabetic ketoacidosis per 1,000 person-years were 6.3 and 4.5 for SGLT2 inhibitors and sulfonylureas, respectively. In Cox proportional hazards regression models, the use of SGLT2 inhibitors was associated with a higher rate of diabetic ketoacidosis compared with DPP-4 inhibitors (adjusted HR [aHR] 1.63; 95% CI 1.36, 1.96) and sulfonylureas (aHR 1.56; 95% CI 1.30, 1.87).

CONCLUSIONS

In this comparative safety study using real-world data, patients with type 2 diabetes who were newly prescribed SGLT2 inhibitors had a higher rate of diabetic ketoacidosis compared with DPP-4 inhibitors and sulfonylureas. Clinicians should be vigilant about this association.
Alopecia Areata as a Proximal Risk Factor for the Development of Comorbid Depression: A Population-based Study
Authors: Tzur Bitan Dana , Berzin Daniella , Kridin Khalaf , Sela Yaron , Cohen Arnon
Published: February 2022

Alopecia areata and depression tend to co-occur; however, their temporal association has not been comprehensively investigated. The aim of this study was to examine the temporal association between alopecia areata and depression. The study included only cases with a comorbid presentation of alopecia areata and depression (n = 1,936), extracted from the databases of the Clalit Health Services, Israel. Survival analyses were used to assess the cumulative probability of receiving alopecia areata as comorbid diagnosis in the years following depression, and vice versa, compared with the opposite trajectory. The results indicate that patients with alopecia areata had greater odds of subsequent depression within 2 years from alopecia areata diagnosis, and showed a steeper increase in cumulative probability of depression as time progressed (log-rank =336.38, p < 0.001), compared with the opposite trajectory. All patients with alopecia areata had comorbid depression within 10 years of alopecia areata, compared with 70% of depression patients receiving diagnoses of comorbid alopecia areata within the same time-frame.
Herramienta computacional para la gestión de abastecimiento en empresas distribuidoras de Ibagué.
Authors: Garzón Quiroga Julián Alonso , Oviedo Monroy Jose Alonso
Published: February 2022

El objetivo de la presente investigación es desarrollar una herramienta de base tecnológica para el mejoramiento de la gestión y operación logística en las principales empresas distribuidoras de productos de consumo masivo de Ibagué. En particular, la investigación busca contribuir al mejoramiento de las principales decisiones del manejo de los inventarios, específicamente en la planeación de compras de los pedidos en las distribuidoras.

Para el desarrollo de la investigación se establecen dos etapas. La primera denominada preliminar comprenderá la documentación problemática existente frente a la gestión de inventarios, al igual que los referentes teóricos para la fundamentación del desarrollo frente a la logística en sus diferentes enfoques para el sector empresarial. Por otra parte, la segunda etapa de desarrollo se estructurará en tres fases:

Fase 1. Diagnóstico y caracterización en las principales empresas distribuidoras de productos de consumo masivo en Ibagué.

Fase 2. Formular estrategias para identificar y seleccionar políticas de control de inventario.

Fase 3. Generar una herramienta que permita establecer un modelo para mejorar la toma de decisiones.

La administración de inventarios responde los problemas que surgen en las organizaciones sobre comprar y mantener existencias, formulando y respondiendo inquietudes del ¿qué?, ¿dónde?, ¿cuándo? y ¿cuánto? comprar, teniendo como principal objetivo la disminución de costos a través de la implementación de herramientas computacionales con diversos niveles de servicio que permitan determinar la situación más rentable (Ballou, 2004).
FPGA Data Acquisition of Electrical Parameter
Authors: Iroanusi Kennedy Ahamefula
Published: February 2022

A data acquisition system using a Programmable Logic Gate Array (FPGA) and Graphical User Interface (GUI) for visual enhancement designed for Personal Computer is shown. The data acquisition of voltage (V), current (A) and temperature ( ) signals and/or parameters transmitted at high frequency in real time via the system-on-chip (SOC) created on Spartan 6 FPGA. The system-on-chip is achieved by programming the FPGA with a high-speed hardware description language (Verilog) code written for the system, Printed Circuit Board (PCB) was designed for the system and the GUI has been created using a graphical approach utilizing LabVIEW to enable data monitoring on Personal Computer (PC) display. The FPGA requires digital input signals; therefore, an analogue to digital convertor (ADC) is required for the convert sensor data from analogue signal from sensors to digital signals. A voltage level shifter is required to normalise the voltage level standards within the circuity in between the 5V from the ADC converter and the 3.3V voltage requirement for the FPGA. The Spartan 6 FPGA receives data from the analogue sensors via the ADC, the data are wrapped up in packets and transmitted through RS-232 serial port to the PC. The three aforementioned parameters are monitored on the GUI on the PC presented in both numerical and graphical format and all data can be store in a file for backup storage, maintenance or reference purposes.
Cooking gas (LPG) Distribution to Rivers State Homes, Case Study: Choba Community
Authors: Amadi Azubuike H. , Uneh Gogo-Isaiah E. , Ene Onaivi C. , Onwa Franklin C. , André Djoï N.
Published: February 2022

Liquefied Petroleum Gas has proved to be an essential source of fuel through the mild blue glowing flame it produces on ignition in the presence of oxygen. This source of heat has made it suitable for use as cooking gas. Various developed countries have been able to transport gas to homes for heating of homes and as cooking gas using grids while considering environmental conditions specific to that country. This study unveils a distribution mechanism for effectively transporting cooking gas safely to homes in Rivers State. This gas distribution plan is a one supplier strategy which could be government or private owned. Choba community was used as a choice case study because of its strategic position. Also, the gas properties such as RVP, Pressure and Temperature were analyzed together with the pipe properties. The project impacts on the major environmental components of the study area were assessed and considered. The distribution routes considered locations of present gas processing plants in Rivers State and optimized routes for transport was introduced. Local terminals to ease distribution, monitoring and safety were also included. The economic analysis of this study will show how the distribution of cooking gas to homes can increase the utilization of Nigerian gas and improve the benefits from Nigerian gas in the next 10 years.
The Use of Froth Flotation for Selective Separation of Plastic Wastes from Soil
Authors: Moro Kofi , Dechie Dorothy A.
Published: February 2022

The Use of Froth Flotation for Selective Separation of Plastic Wastes from Soil

 

Kofi Moro and Dorothy A. Dechie

 

Abstract — In recycling of plastics, unless the goal is to form composites or materials having special properties, it is not advisable to mix plastics of different kinds because of the differences in their molecular weights and chain lengths. Hence, there is the need to separate these plastics when they are mixed before recycle can be done. This project investigated the selective separation of Polypropylene (PP), Polystyrene (PS) and Polyethylene terephthalate (PET) plastics out of soils using froth flotation. Pulverized samples were prepared from post-consumer plastic sources (PP, PS and PET) and soil and mixed uniformly to form a composite sample. The composite sample was subjected to froth flotation. Two tests were performed. A first test, where there was no addition of a depressant (tannic acid), and a second test, where there was addition of tannic acid to depress some of the plastics in order to selectively separate them. Recoveries from each test work indicated that, plastics are naturally hydrophobic and can be floated out of soils without modifying their surface properties. However, selective separations of the plastics were achieved when tannic acid was used to modify the surface properties of the plastic types.
Comparative Study of Oil Recovery Factor Determination for Edge and Bottom Water Drive Mechanism Using Water Influx Models
Authors: Nmegbu C. G. J. , Ebube Orisa F. , Edet Emmanuel Aniedi
Published: February 2022

The purpose of this research work is to comparatively study the oil recovery factor from two major aquifer geometry (Bottom and Edge water aquifer) using water aquifer model owing to the fact that most if not every reservoir is bounded by a water aquifer with relative size content (Most Large). These aquifers are pivotal in oil recovery factor (percent%), Cumulative oil produced (MMSTB) as well as overall reservoir performance the methodology utilized in this study involves; Identification of appropriate influx models were utilized for aquifer characterization. The characterizes of the Niger Delta reservoir aquifer considered include aquifer permeability, aquifer porosity etc. Estimation of aquifer properties is achieved by using regressed method in Material Balance Software (MBAL). This approach involves History Matching of average reservoir pressure with computed pressure of the reservoir utilizing production data and PVT data. The computed pressure from model is history matched by regressing most uncertain parameters in aquifer such as aquifer size, permeability, and porosity. Historic production data was imputed into the MBAL Tank Model, the production data was matched with the model simulation by regressing on rock and fluid parameters with high uncertainty. The match parameters were recorded as the base parameter and other sensitivity on aquifer parameters using the Fetkovich model for the bottom and edge water drive. The average percentage increase in oil cumulative volume was 0.40% in fovour of bottom water drive. Further sensitivity on cumulative oil recovered showed the increase in reservoir size with increasing aquifer volumes increases oil production exponentially in bottom water drive whereas edge water drive increased linearly. Aquifer volume, aquifer permeability showed linear relationship with bottom and edge water drive.
Simultaneous Planning of Production, Setup and Maintenance for an Unreliable Multiple Products Manufacturing System
Authors: Kibouka Guy Richard , Mandatsy Moungomo Jean Brice , Ndama Adoum Traoré
Published: February 2022

The work presented in this paper addresses the problem of joint optimization of the production, setup and corrective maintenance activities of a manufacturing system. This system consists of a machine subject to breakdowns and repairs and producing two types of parts. A corrective maintenance strategy whose repair rate depends on the number of setup operations already performed on the production system is considered in this work. The objective of this research is to propose a policy that controls production, setup, and corrective maintenance. The contribution of this paper is through the control of the repair rate, combined with the planning of production and setup in a dynamic and stochastic context. Optimality conditions in the form of Hamilton-Jacoby-Bellman (HJB) equations are obtained and a numerical approach is proposed in order to deal with the joint optimization issues. Extensive simulations are performed to address many scenarios that illustrate the interactions between production, setup and maintenance activities.
Performance Evaluation of a Small-Scale Mechanical Fish Feeder
Authors: Fasoyin S. A. , Akinfiresoye W. A. , Agbetoye L. A. S. , Olutayo L. A. , Adetuyi O.
Published: February 2022

The performance evaluation of an existing mechanical fish feeder was carried out. Floating feeds of sizes 2 mm, 4 mm, and 6 mm at constant moisture content of 13 % were fed into the feeder. The feeder was powered by a 3-phase, 1.5 kW reducing gear electric motor at speed 40 rpm, 50 rpm, 60 rpm, 70 rpm and 80 rpm machine. It was observed that the horizontal screw conveyor effectively transported the material from the hopper to the discharged point. The results obtained from the tests showed an optimal performance of the machine at speed 50 rpm with dispensing efficiency of 93.1 % for 2 mm feed size, while the throughput was 75.76 kg/h at motor speed of 80 rpm also for the 2 mm fish feed size. The ANOVA at p ? 0.05 showed that machine speed has significant effect on its dispensing efficiency and the throughput capacity. The cost of production of the mechanical fish feeder was ?262,300 which made it affordable for young entrepreneurs.
Synthesis, Crystal Growth, Crystal Arrangement, Optical, Thermal, NLO and Biological Investigations of Heterocyclic Compounds of N-(1,3-benzothiazol-2-yl)benzamide and N-(1,3-benzothiazol-2-yl)-2-fluorobenzamide
Authors: Raveendiran C. , Prabukanthan P.
Published: February 2022

Heterocyclic organic nonlinear optical materials of N-(1,3-benzothiazol-2-yl)benzamide [2-BTBA] and N-(1,3-benzothiazol-2-yl)-2-fluorobenzamide [2-BTFBA] were orchestrated by benzoylation of 2-aminobenzothiazole utilizing subbed benzoyl chloride. The orchestrated mixtures2-BTBA and 2-BTFBA molecular ion peaks at 253.9 & 272 were affirmed by GC-MS. The grown single crystals of 2-BTBA and 2-BTFBA were developed by slow evaporation method at room temperature with a combination of ethyl acetate & methanol as dissolvable. The X-ray diffraction investigations of equally 2-BTBA & 2-BTFBA crystal have a monoclinic framework with space group P21/n individually. The FT-IR spectra of 2-BTBA and 2-BTFBA show absorption peaks at 1670 and 1660 cm-1, indicating the presence of carbonyl functional group vibration modes in the molecules. UV–Vis spectra show a awesome absorbance band at 303 & 300 nm for 2-BTBA and 2-BTFBA molecules, respectively. The number of protons and carbons were predicted using 1H and 13C NMR spectrum studies. TGA and DTA analyses confirmed the various stages of disintegration of the produced crystals, and they are thermally stable up to 403 K and 333 K for 2-BTBA and 2-BTFBA, respectively. The zone of hindrance method was used to test the antibacterial and antifungal activities of produced single crystals using amphotericin-B and ciprofloxacin as standards. The outcomesprove that the incorporated mixtures display prevalent anti-fungal and antibacterial activity. The non-linear efficiency was affirmed by Kurtz- Perry concentrates trategy for 2-BTBA and 2-BTFBA crystals with the SHG proficiency 2.28 and 2.83 times more prominent than that of potassium dihydrogen phosphate [KDP].
Evaluation of the Effect of Deposition pH on the Physico-chemical Properties of Electrochemically Deposited Cadmium Telluride for Photovoltaic Device Applications
Authors: Ojo Ayotunde A. , Olanipekun Kolade A. , Oluwadare Benjamin S. , Oni Taiwo O.
Published: February 2022

Two-electrode (2E) configuration was successfully utilised in the electrochemical deposition of cadmium telluride (CdTe) on fluorine-doped tin oxide (FTO) substrate with the main emphasis on the electrolytic bath pH. The electrochemical deposition pH explored is within the range of (1.00 to 6.00)±0.02 for the aqueous electrolyte comprising of tellurium oxide (TeO2) and cadmium nitrate (Cd(NO3)2) which are the respective precursors of Te and Cd. The optical, structural, morphological, compositional, and electrical properties of the electroplated CdTe thin-films were respectively explored using UV-Vis spectrophotometry, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), and photoelectrochemical (PEC) cell measurements. The optical characterisation show that the CdTe samples exhibit dissimilar absorbance depending on the growth pH for both the as-deposited layers and post-growth treated CdTe layers. A decrease in the absorption edge slope and dip in the bandgap was observed away from pH2. The bandgap of the post-growth treated CdTe layers showed enhancement as it leans towards 1.45 eV, with the trend retention of absorption edge slope, similar to the as-deposited CdTe layers. The electrodeposited CdTe thin-films show a dominant orientation along the cubic (111) CdTe plane, while both the the calculated crystallite size and the XRD peak intensity Pi decreases with the electroplating pH outside the (2.00 to 3.00)±0.02 range. The EDX analyses depicts an alteration in the ratio of Cd to Te atomic percentage relative to the pH of the electrolyte. Comparatively high Te atomic ratio was observed at lower pH values and vice versa with increase alkalinity of the electrolyte. The obtained morphology depicts that the underlying FTO layers are well covered with a gradual reduction in the grain size of the CdTe observable away from pH value (2.00 and 3.00). The photoelectrochemical cell study depicts that the conduction type of the CdTe layers can also be attributed to the CdTe-electrolytic bath pH value.
Management Proposal for Consumable Item Control in an Electronic Company Using Concept of Human Reliability and Quality Tools
Authors: Da Silva Polyana Almeida , Oliveira Marcelo Albuquerque de , Veroneze Gabriela de Mattos , Da Silva Camila Maria Costa
Published: February 2022

This paper will bring a new proposal for the management and control of consumable items in an electronic company at Manaus Industrial Pole, using the concept of human reliability in order to reach a best efficiency of the activities carried out by the coating station operators and also the use of tools like control charts, Ishikawa diagram, 5W2H, and PDCA which when are combined result in the understanding of the problem and also a better management method in the current situation.
Pore Structure as a Determinant of Flexibility in Sustainable Lime-Cement Mortar Composites
Authors: Olaniyan Sule Adeniyi
Published: February 2022

Flexibility of Lime Mortar resulting from its good permeability feature through its relatively large interconnected pore structure makes it popular as an old sustainable building material. This characteristic feature enhances its capability to suppress masonry deformation. However, its mechanical strength is weak. To address this shortcoming, cement is added to form a stronger composite. This study, therefore, evaluates the pore structure of the resulting lime-cement composite, with a view to assessing impact and sustainability of the lime’s flexibility in the overall performance of the composite. Adopting equal mix ratio (1:3) of Binder/Aggregate (B/A), mortars were prepared using lime as a lone binder, as well as other five different compositions in the ascending and descending order of lime and cement binders (i.e., 1:1, 1:2, 1:3, 2:1 and 3:1). Each composition was assessed in fresh state using Water/Binder ratio, Air Content and Bulk Density. For the hardened state assessments, mechanical characteristics and microstructural features evaluated through six (6) and twelve (12) month curing periods respectively, were considered. Results of the investigation reveal that low cumulative porosity (i.e., summation of the porosities) across the three pore regions of Inter-Nano pores (1 – 10 nm), Super-Nano pores (10 – 100 nm) and Sub-Micro pores (0.1 – 1 µm), for each of the mortars, is observed to be synonymous with low cement content, low Modulus of Elasticity, low (fc/ff), and thus, high flexibility. This observation is supported by high linear coefficient of correlation (R2 = 0.89) for the equation describing both ‘cumulative porosity’ (within the referenced three pore ranges) and cement content. Thus, it could be inferred that despite cement addition with resulting alteration in the pore structure of the composite, presence of lime would retain flexibility property of the composites, with more flexibility in the descending order of cement contents. Considering the impacts of pandemic climate change, growing energy costs and human activities on the environment, this study therefore attempts to promote revival of an old but partially abandoned sustainable lime based mortars, with a view to facilitating improved lime mortar performances, conservation of energy resources and overall protection of the environment.
Blockchain-based Intelligent Monitored Security System for Detection of Replication Attack in the Wireless Healthcare Network
Authors: Warraich Jatinder , Singh Chetanpal , Thapa Prem
Published: February 2022

Wireless sensor networks have revolutionized the way healthcare works replacing the traditional methods with sensor-enabled IoT devices that help in monitoring the data. The data is collected by these sensors that are there on the body of the user, the data is transmitted over the network to the healthcare monitoring systems. The transmission follows the route of the wireless channel that is not secure as it can be accessed by legitimate as well as illegitimate users. These pose security threats; one such attack is a replication attack. This makes the replicas of the original node, replaces the data with the malicious content for attacking the system, and deploys the node back to the network making it difficult to detect. The aim of the work is to review the Blockchain-based intelligent monitored security system for the detection of replication attacks in the wireless healthcare network. The method used for review is the secondary research method. The main focus of the work is kept on the literature review for obtaining insights and knowledge. The results show that blockchain provides the required security to the data carried by the sensor-enabled IoT. The result contributed to the understanding of the different blockchain techniques in securing data. The system component is farmed in the work and verified in the results.
Classification of Ultra-high Performance Concrete (UHPC)
Authors: Smith A. S. J. , Xu G.
Published: February 2022

Ultra-high performance concrete (UHPC) been an advanced concrete introduced as reactive powder concrete (RPC) over twenty years ago, is now being employed for use in the construction industry of some developed countries like China, Germany and United States of America. Its excellent properties in structural performance and durability make it the civil engineering material that will reshape the future of the construction industry in terms of structural performance; and this paper aims at helping construction experts and developing countries to understand and accept UHPC for use in everyday construction works. The paper gives an in-depth review on the classification of UHPCs based on mix proportion and mechanical properties. Firstly, the mixture design and the mechanical properties of UHPC were discussed. Then UHPC was classified into different types based on mechanical properties and the manufacturer’s modification of the ingredients used for reactive powder concrete or multi-scale cement composite production. This review shows that Funk and Dinger model (also known as Modified Andreasen and Andersen model (MAA)) is the most accepted and widely used mix design method for UHPC. It also revealed that UHPC’s compressive strength, tensile strength and flexural strength are in excess of 150, 7 and 40 MPa respectively. It further classified UHPC into BCV®, BSI®, Cemtec®, Ceracem, Ductal, DURA and UHPC with coarse aggregate; and this classification (especially UHPC with coarse aggregate) is a good sign that local materials can be incorporated into UHPC by developing countries for cost minimisation.
Investigation into the Application of Cissus Populnea as Drilling Fluid Additive (Viscosifier) for Water Based Mud
Authors: Sulaiman A. D. I. , Adamu M. B. , Hassan Usman , Aliyu S. M.
Published: February 2022

Progress in drilling engineering demands more sophistication from the drilling mud in order to enhance the usage of drilling fluids, hence numerous additives were introduced, and a simple fluid became a complicated mixture of liquid, solid and chemicals. Some of the challenges with the existing drilling fluid additives has to do with compatibility, degradability, safety, cost, and environmental friendliness. Studies have been carried out on the economic benefits of Cissus Populnea which includes in areas of food, medicine, shelter, and transport but much attention has been paid to its applications in the Oil and Gas industry. This study investigates the rheological properties of Cissus Populnea for application as drilling fluid additive (viscosifier) in Water Based Drilling Mud. Fresh roots, stems and leaves of cissus populnea were sourced from Bayara, Bauchi State. Some liquid exudates of cissus populnea were collected and stored for analysis while some of the samples were dried and grinded in to powdered form. Exudate of the samples were characterized by FTIR, XRD and XRF. Drilling mud was formulated with the samples cisssus populnea and bentonite at different temperatures. The rheology of the formulated drilling mud was investigated and compared with that formulated using bentonite and carboxymethyl cellulose (CMC). Results from X-ray Fluorescence analysis show that the chemical composition of Cissus populnea stem and root are similar when comparing their major components (In2O3 and CaO), while that of leaf has its major components to be In2O3 and Cl. Therefore, in this research work, experiments were conducted with only stem and leaf since stem and roots have common features. From the results of FTIR spectra, the stem of cissus populnea has an OH peak wavelength of 3487.42 cm-1 while that of leave is 3340.82 cm-1. The diffractogram of the stem of cissus populnea was observed at 2q = 22.67o which is very close to that of CMC (2? = 20.31o) while the intense peaks of leaf were observed at around 28.65o. Viscosity of cissus populnea was investigated and found to be decreasing with the increase in temperature for stem exudate. While for leaf exudate, the viscosity was rather increasing with the increase in temperature at temperatures below 35 oC and then continue to decrease with the increase in temperature. The outcome of this research has confirmed the applicability of cissus populnea for drilling fluid additives, viscosifier.