bluuebunny/crossref_metadata_2025 huggingface dataset:
MOTIVASI KERJA, LINGKUNGAN KERJA DAN KINERJA PEGAWAI PADA DINAS KESEHATAN KABUPATEN BULELENG
Authors: Pratiwi Kadek Indah Hadi , Madiarsa I Made , Wati Ni Putu Sri
Published: August 2022

Dinas Kesehatan Kabupaten Buleleng dalam melaksanakan tugas dan fungsinya, sangat tergantung kepada kemampuan masing-masing pegawai dalam melaksanakan pekerjaan atau tugas-tugas yang menjadi tanggung jawabnya. Penelitian ini bertujuan mengetahui pengaruh secara individu dan bersama-sama motivasi kerja dan lingkungan kerja terhadap kinerja pegawai pada Dinas Kesehatan Kabupaten Buleleng, dan untuk mengetahui variabel yang lebih dominan berpengaruh. Data dikumpulkan dengan menggunakan teknik observasi, wawancara, dokumentasi, dan kuesioner. Pengujian istrumen dan uji asumsi klasik. Teknik analisis data kuantitatif; analisis regresi berganda, analisis determinasi, uji hipotesis, dan analisis kualitatif. Hasil uji instrumen semua instrumen penelitian valid dan reliabel. Hasil uji asumsi klasik data berdistribusi normal, data terbebas dari problem multikolinearitas, dan tidak terjadi heteroskedastisitas. Hasil analisis regresi linier berganda diperoleh model persamaan garis regresi yaitu Ŷ = 4,200 + 0,412X1 + 0,158X2. Nilai determinasi sebesar 68,60%. Ini berarti 68,60% perubahan kinerja pegawai Dinas Kesehatan Kabupaten Buleleng dapat dijelaskan oleh perubahan variabel motivasi kerja dan lingkungan kerja serta sisanya 31,40% ditentukan oleh variabel lain yang tidak diteliti. Hasil uji hipotesis nilai thitung > ttabel dan nilai fhitung > ftabel. Variabel motivasi kerjamempunyai nilai Stardized Coefficients Beta lebih besar. Simpulan ada pengaruh positif signifikan secara individu dan bersama-sama motivasi kerja, lingkungan kerja terhadap kinerja pegawai pada Dinas Kesehatan Kabupaten Buleleng. Variabel motivasi kerja yang lebih dominan berpengaruh. Saran kepada pihak pimpinan Dinas Kesehatan Kabupaten Buleleng untuk meningkatkan kinerja pegawai dapat dilakukan dengan meningkatkan motivasi kerja dalam bentuk pemenuhan kebutuhan dan memperbaiki lingkungan kerja.
ANALISIS TINGKAT KESEHATAN UNIT SIMPAN PINJAM PADA KOPERASI UNIT DESA TAHUN BUKU 2020 DI KABUPATEN BULELENG
Authors: Dwi Saputro Indra Harmawan , Resmi Ni Nyoman , Sri Wati Ni Putu
Published: August 2022

Koperasi Unit Desa (KUD) di Kabupaten Buleleng dijadikan objek dalam penelitian ini berangkat dari kenyataan yang menunjukkan akhir – akhir ini perkembangan koperasi sebagai sebuah badan usaha pengembangan ekonomi masyarakat kecil mengalami kemajuan terutama kajian – kajian yang dapat membantu pengelolaan koperasi dengan di latar belakangi permasalah tingkat kesehatan keuangan belum dilakukan perhitungan oleh koperasi. Penelitian ini bertujuan untuk mengetahui tingkat Kesehatan Koperasi Unit Simpan Pinjam pada Koperasi Unit Desa tahun buku 2020 di Kabupaten Buleleng dilihat dari tujuh aspek yaitu permodalan, kualitas aktiva produktif, manajemen, efisiensi, likuiditas, kemandirian dan pertumbuhan serta jati diri koperasi. Data dikumpulkan dengan mempergunakan teknik observasi,wawancara, dan dokumentasi. Data dianalisis secara kuantitatif dengan pendekatan rasio-rasio serta aspek-aspek dalam menilai tingkat kesehatan koperasi menggunakan ketujuh aspek diatas. Hasil penelitian ini menerangkan bahwa ketujuh Koperasi Unit Desa (KUD) yang dijadikan sampel penelitian memiliki tingkat kesehatan rata-rata 68,03 yang dikategorikan cukup sehat. Saran untuk ketujuh KUD di Kabupaten Buleleng agar terus meningkatkan kinerjanya yang nantinya bisa merubah predikat Cukup Sehat ke predikat Sehat dengan berpedoman penilaian ketujuh aspek penilaian koperasi. Kata kunci: Tingkat Kesehatan, Simpan Pinjam dan Koperasi Unit Desa (KUD).
FAKTOR-FAKTOR YANG MEMENGARUHI PERILAKU KONSUMEN DALAM PENGAMBILAN KEPUTUSAN PEMBELIAN PRODUK PADA MINI MARKET ABD FOOD MART DI SINGARAJA
Authors: Artaningsih Luh
Published: August 2022

Dalam pembelian suatu produk, konsumen mempunyai selera dan keinginan yang berbeda-beda atau perilaku konsumen berbeda-beda. Bauran pemasaran merupakan faktor yang paling dominan memengaruhi keputusan konsumen dalam pembelian suatu produk. Promosi merupakan salah satu faktor penentu keberhasilan program pemasaran. Penelitian ini bertujuan untuk mengetahui (1) faktor-faktor yang memengaruhi perilaku konsumen dalam pengambilan keputusan pembelian produk pada Mini Market ABD Food Mart di Singaraja, dan (2) faktor dominan yang memengaruhi perilaku konsumen dalam pengambilan keputusan pembelian produk. Jenis data yang digunakan dalam penelitian ini adalah data primer.Subjek dalam penelitian ini adalah pembeli umum / konsumen yang membeliproduk pada Mini Market ABD Food Mart di Singaraja. Sedangkan objeknya adalah keputusan konsumen serta faktor harga, tempat, promosi, produk, gaya hidup, pekerjaan, sikap, situasi ekonomi pembeli, kebudayaan, kelas sosial, kelompok acuan, keluarga, pengalaman, persepsi, dan umur. Hasil penelitian ini menunjukkan bahwa berdasarkan nilai Measure of Sampling Adequacy (MSA) terdapat dua faktor yang mempengaruhi keputusan konsumen dalam berbelanja, yaitu (1) faktor bauran pemasaran mempengaruhi sebesar 46,504, dan (2) faktor pribadi mempengharuhi sebesar 17,624.Kedua faktor tersebut mempunyai total percentage of variance sebesar 64,128% artinya kedua faktor tersebut mampu menjelaskan pengaruhnya sebesar 64,128% terhadap keputusan konsumen dalam pembelian produk . Berdasarkan data tersebut faktor bauran pemasaran merupakan faktor yang paling dominan mempengaruhi keputusan konsumen dalam pengambilan keputusan pembelian produk. Diantara keempat variabel bauran pemasaran tersebut faktor promosi yang mempunyai faktor loading tertinggi yaitu sebesar 0,854. Kata kunci: Perilaku konsumen dan keputusan pembelian
Results of Surgical Treatment of Patients with Chronic Acromioclavicular Joint Dislocations
Authors: Bezruchenko S.O. , Dolhopolov O.V. , Yuriichuk L.M. , Yarova M.L. , Bohdan S.V. , Siforov D.V.
Published: August 2022

Relevance. Treatment of chronic acromioclavicular joint dislocations remains a controversial issue and ranges from conservative treatment to extensive reconstruction.

Objective: to compare clinical and radiographic results of surgical treatment of patients with chronic acromioclavicular joint dislocation.

Materials and Methods. A retrospective analysis of 41 patients with chronic acromioclavicular joint dislocation was performed (time from the injury was more than 3 weeks). The patients were divided into two groups: group I (19 patients, 46.3%), which underwent arthroscopically assisted dynamic type of acromioclavicular joint dislocation stabilization with acromioclavicular and coracoclavicular ligaments augmentation, and group II (22 patients, 53.7%), which underwent fixation of acromioclavicular joint dislocation with Hook-plate and acromioclavicular and coracoclavicular ligaments augmentation. The mean age at surgery was 34.1±11.2 years (range 18-70 years). Most of the patients were males – 36 patients (87.8%). Clinical outcomes were assessed using the Oxford Shoulder Score, Constant – Murley Score, and Acromioclavicular Joint Instability Scoring System.

Results. The mean Oxford Shoulder score before surgical treatment was 31.5±7.7 points and 33.3±4.2 points (p=0.347), and at the final follow-up 46±2.6 points and 46.1±1.6 points – in group I and group II, respectively. The mean Constant – Murley score before surgical treatment was 68.9±12.4 points and 69.7±14.5 points (p=0.863), and at the final follow-up 94.2±7.7 points and 96.5±3.9 points (p=0.291). The mean Acromioclavicular Joint Instability Scoring System score before surgical treatment was 31.3±9.5 points and 25.1±8.2 points (p=0.087), and at the final follow-up 79.9±16.7 points and 75.7±9.1 points (p=0.422), respectively. Concomitant intra-articular injuries of the shoulder joint were diagnosed in 68.4% of patients; the most common injuries were SLAP injury and long head of biceps tendonitis. Complications of treatment were noted in both groups, but there were no complications that would require additional reconstructive.

Conclusions. Arthroscopic assisted dynamic fixation techniques or open fixation techniques with a specialized plate in combination with the reconstruction of acromioclavicular ligaments and coracoclavicular ligaments by tendon autografts provides good long-term functional results.
New species of Gumilevia Yakovlev, 2011 (Lepidoptera, Cossidae: Cossinae) from Nigeria with Catalogue of the Genus
Authors: Yakovlev Roman V.
Published: August 2022

The article describes Gumilevia mungoparki sp. n. from the Nigeria. The detailed diagnosis is given. The catalogue of the Genus Gumilevia Yakovlev, 2011 is provided. The article is illustrated with six figures.
A Study on the Combat Effect and Components of Intangible Combat Force
Authors: Kim Jangryul , Jeong Sukjae
Published: August 2022

The purpose of this study is to numerically derive the combat effect of intangible combat power on the battlefield and to confirm the importance of the components of intangible combat power on the derived combat effect. Nearly half of defense spending is used every year to improve defense capabilities for the construction of tangible combat forces, but the expenditure for the construction of intangible forces is insignificant. The reason why it is passive in building intangible combat power is that tangible combat power can be identified as a numerical value, but the increase or decrease in intangible combat power cannot be identified. This imbalance in the construction of tangible and intangible combat forces is likely to halve the integrated exercise of combat power in an actual battlefield. Therefore, for the construction of balanced combat power, research is urgently required to confirm the importance of quantifying and deriving combat effects on how intangible combat power is exerted in combat. In this study, the combat effect of intangible combat power was analyzed in terms of space, time, and combat power, and the difference in the combat results of computer simulation (Vision 21) under the same conditions as those for KCTC combat training was assumed and compared. The analysis results confirmed that the combat effect of the intangible combat force exerted at the KCTC combat site was 28.7%, which did not exert a combat effect of 71.3%. The importance of the components of the intangible combat force that affect the combat effect of the intangible combat force derived in this way was analyzed using a statistical analysis program applying linear regression analysis. The analysis results confirmed the requirements and priorities of future education and training through complementary needs and rankings according to the importance of the components.
Australian Law During COVID-19
Authors: Bennett Belinda , Lewis Bridget , Dickson Elizabeth , Then Shih-Ning , Purser Kelly
Published: August 2022

This article focuses on the interests of older Australians during the COVID-19 pandemic. It analyses the implications of the pandemic for older Australians from a human rights perspective, recognising the need to understand ageing as a process that occurs throughout life. Although we focus on the interests of older Australians, defining what is meant by ‘older’ can be challenging. Furthermore, there are complex social discourses around ageing. While there is no Convention on the Rights of Older Persons, international human rights law is relevant to the rights of older persons. We analyse international human rights law, Australian human rights law, and Australian antidiscrimination law in terms of their relevance to the rights of older persons in the context of the COVID-19 pandemic. With social distancing a key feature of the pandemic, we also consider the impact of social isolation on older persons and the potential for technology to assist in overcoming social isolation. Finally, we analyse current Australian laws relating to participation of individuals in research where capacity has been lost or is diminishing.
Congenital thrombophilia associated with intrahepatic cholestasis of pregnancy. A case report
Authors: Iliadi-Tulbure Corina , Cemortan Maria , Bubulici Cristina , Botnari-Gutu Mihaela , Cernetchi Olga
Published: August 2022

Intrahepatic cholestasis of pregnancy is pregnancy-specific liver disorder, characterized by pruritus as the main clinical symptom, and fasting liver function tests. The term thrombophilia is used to describe a group of conditions characterized by blood coagulation disorder with increased risk of blood clot formation, which may be congenital or acquired. In general, population the incidence of thrombophilia and intrahepatic cholestasis of pregnancy varies widely, depending on the type of disorder (in case of congenital thrombophilia) and geographical distribution (in case of intrahepatic cholestasis of pregnancy). A high incidence of pregnancy complications makes both congenital thrombophilia and intrahepatic cholestasis of pregnancy very important in clinical practice. At the same time, association between these two disorders is extremely complicated in management, due to perinatal risks. The key-point for the management is cooperation among obstetricians, hematologists, and hepatologists, being crucial for better outcomes.
Correlation between level of vitamin D in serum and value of lung function in children diagnosed with bronchial asthma
Authors: Behluli Emir , Spahiu Lidvana , Ismaili-Jaha Vlora , Neziri Burim , Temaj Gazmend
Published: August 2022

Introduction: Many authors in their research have suggested an association between vitamin D and asthma, but the results from these publications are sometimes confusing.

Aim: Our aim was to assess the relationship between serum vitamin D and lung function in patients previously diagnosed with asthma.

Materials and methods: The present study started in September 2019 and was completed in May 2020. All patients were diagnosed at the University Clinical Center-Prishtina, Kosovo. Spirometry was performed on children of ages 6-16 years old with a spirometer according to the recommendations of the American Thoracic Society.

Results: Of the 57 children who visited the University Clinical Center of Kosovo-Department of Pediatrics, 29 were diagnosed with asthma. The Spearman coefficient correlation showed statistical significance between vitamin D and body weight, and vitamin D and FEF75% at level 0.05. Other parameters did not show statistical significance with vitamin D, but such statistical significance was found in other parameters between asthma and healthy groups.

Conclusions: Our data suggested that serum vitamin D level was insignificant for FVC%, FEV1%, Tiffeneau Index values, and PEF. Statistical significance was observed between vitamin D and body weight; vitamin D and FEF75% (p=0.05).
Signal transduction from ligand-receptor binding associated with the formation of invadopodia in an invasive cancer cell
Authors: Yaacob Noorehan , Shafie Sharidan , Suzuki Takashi , Admon Mohd Ariff
Published: August 2022

Invadopodia are finger-like protrusions that are commonly spotted at the membrane of the invasive cancer cell. These structures are a major cause of death among cancer patients through metastasis process. Signal transduction stimulated upon contact between ligand and membrane receptors is identified as one of key factors in invadopodia formation. In this study, a time-dependent mathematical model of signal and ligand is investigated numerically. The moving boundary of plasma membrane is taken as a zero-level set function and is moved by the velocity that accounted as the difference of gradient between intra-cellular signal and extra-cellular ligand. The model is solved using a combination of ghost with linear extrapolation and finite difference methods. The results showed that the stimulation of signal from membrane associated ligand consequently moved the plasma membrane outward as time increases. The highest densities of signal and ligand are recorded on the membrane and slowly diffused into intra-cellular and extra-cellular regions, respectively.
When does a double-layer potential equal to a single-layer one?
Authors: Ramm Alexander G.
Published: August 2022

Let $ D $ be a bounded domain in $ {{\mathbb R}}^3 $ with a closed, smooth, connected boundary $ S $, $ N $ be the outer unit normal to $ S $, $ k > 0 $ be a constant, $ u_{N^{\pm}} $ are the limiting values of the normal derivative of $ u $ on $ S $ from $ D $, respectively $ D': = {{\mathbb R}}^3\setminus \bar{D} $; $ g(x, y) = \frac{e^{ik|x-y|}}{4\pi |x-y|} $, $ w: = w(x, \mu): = \int_S g_{N}(x, s)\mu(s)ds $ be the double-layer potential, $ u: = u(x, \sigma): = \int_S g(x, s)\sigma(s)ds $ be the single-layer potential.

In this paper it is proved that for every $ w $ there is a unique $ u $, such that $ w = u $ in $ D $ and vice versa. This result is new, although the potential theory has more than 150 years of history.

Necessary and sufficient conditions are given for the existence of $ u $ and the relation $ w = u $ in $ D' $, given $ w $ in $ D' $, and for the existence of $ w $ and the relation $ w = u $ in $ D' $, given $ u $ in $ D' $.
Asymptotic behavior of ordered random variables in mixture of two Gaussian sequences with random index
Authors: Barakat H. M. , Dwes M. H.
Published: August 2022

When the random sample size is assumed to converge weakly and to be independent of the basic variables, the asymptotic distributions of extreme, intermediate, and central order statistics, as well as record values, for a mixture of two stationary Gaussian sequences under an equi-correlated setup are derived. Furthermore, sufficient conditions for convergence are derived in each case. An interesting fact is revealed that in several cases, the limit distributions of the aforementioned statistics are the same when the sample size is random and non-random. e.g., when one mixture component has a correlation that converges to a non-zero value.
Retrieval and Recommendation of English Learning Resources Based on Knowledge Correlation
Authors: Li Fangfang
Published: August 2022

The design of retrieval and recommendation method of personalized learning resources based on students’ cognition level of professional knowledge and the correlation degree of the knowledge is of certain practical significance. In reality, students’ learning preferences and needs will change with the passing of time and the upgrading of learning stages, so giving learning resource recommendations without considering the time series features of students’ needs for learning resources cannot guarantee students' learning efficiency or the effect of personal knowledge system perfection. To solve this problem, this paper took online English learning as an example to study the retrieval and recommendation of English learning resources based on knowledge correlation. At first, the paper gave the relationship between the knowledge points of English learning resources, and gave judgements on students’ mastery degree of knowledge points. Then, the influence of the semantics and relationships of knowledge points involved in English learning was fully considered, and the closeness degree of the correlation of learning resources was calculated. At last, this paper introduced a hybrid attention mechanism into the learning resource recommendation model, and gave the process for calculating the weight of hybrid attention. The effectiveness of the constructed model was verified by the experimental results.
Augmented Reality Books: Motivation, Attitudes, and Behaviors of Young Readers
Authors: Roumba Evanthia , Nicolaidou Iolie
Published: August 2022

Augmented Reality (AR) books show potential to increase young learners’ reading motivation, which is important given children's declining reading motivation over the school years. Previous studies measured reading motivation only in higher education and only after users’ experience with AR. Few empirical studies have focused on school-aged children and those examined attitudes, not motivation. This study aimed to: a) examine how young children's motivation changes through the experience of reading AR books and b) document their attitudes and behaviors after this experience. Participants in this pre-test post-test case study were 40 fourth and fifth graders. Data sources included validated questionnaires and an observation protocol of children’s behavior while interacting with AR books. The results of paired samples t-tests for children's motivation indicated a statistically significant increase in attention (t (39) = - 3.07, p = 0.004), confidence (t (39) = - 2.44, p = 0.019) and satisfaction (t (39) = - 3.26, p = 0.002). Children read comfortably, seemed focused, and were eager to read more. They showed a high level of enthusiasm with AR technology when interacting with the first AR book, which notably decreased with the second book. The children maintained positive attitudes and behaviors towards AR. The study showed that even through short-term interactions, AR books have the potential to increase young students’ reading motivation. It adds to our knowledge concerning the use of AR books by primary school children, who are under-represented in the literature. Directions for future research are drawn.
Leveraging Google Search Data and Artificial Intelligence Methods for Provincial-level Influenza Forecasting: A South African Case Study
Authors: Olukanmi Seun , Nelwamondo Fulufhelo , Nwulu Nnamdi
Published: August 2022

This paper investigates the usefulness of Google search patterns with Artificial Intelligence (AI) techniques for timely influenza-like illness (ILI) forecasting for each of the nine South African provinces. Traditional surveillance methods are limited by delays in reporting. Existing digital disease surveillance studies that employ alternative online data have scarcely explored sub-Saharan African countries. In South Africa, Google search data has only been recently studied for ILI surveillance at the national level. Meanwhile, the differences in socio-economic and technological conditions across provinces call for a finer spatial investigation. We perform correlation analysis between Google trends (GT) data for 21 ILI-related terms and real-life ILI surveillance data for each province. Next, we develop models to assess the predictive performance of these GT data for forecasting ILI rates, using time series, machine learning, and deep learning methods. We observe sufficient correlation for only two of the nine provinces: Gauteng and Western Cape. Thus, GT data could only be used to forecast ILI in these two provinces. Interestingly, these two provinces are regarded as the most economically developed. In the other seven provinces, LSTM, a deep learning technique, gives more accurate predictions than a baseline autoregressive model when only past ILI data are used for forecasting future ILI trends. The results reveal that, for provinces for which GT data is sufficiently available, it is not only free and fast, but is an effective predictor on its own as well as when added to past ILI data for forecasting future ILI infection rates. The correlation analysis suggests an association between provincial socio-economic development and the use of digital platforms for disease surveillance. Overall, the study established the need for finer scale ILI forecasting which will inform targeted planning for disease surveillance and interventions.
ConVnet BiLSTM for ASD Classification on EEG Brain Signal
Authors: Ali Nur Alisa , A. Radzi Syafeeza , Jaafar Abd Shukur , K. Nor Norazlin
Published: August 2022

As a neurodevelopmental disability, Autism Spectrum Disorder (ASD) is classified as a spectrum disorder.  The availability of an automated technology system to classify the ASD trait would have a significant impact on paediatricians, as it would assist them in diagnosing ASD in children using a quantifiable method. In this paper, we propose a novel autism diagnosis method that is based on a hybrid of the deep learning algorithms. This hybrid consists of a convolutional neural network (ConVnet) architecture that merges two LSTM blocks (BiLSTM) with the other direction of propagation to classify the output state on the brain signal data from electroencephalogram (EEG) on individuals; typically development (TD) and autism (ASD) obtained from the Simon Foundation Autism Research Initiative (SFARI) database to classify the output state. For a 70:30 data distribution, an accuracy of 97.7 percent was achieved. Proposed methods outperformed the current state-of-the art in terms of autism classification efficiency and have the potential to make a significant contribution to neuroscience research, as demonstrated by the results.
Recent Applications of Flash Flood Hazard Assessment Techniques: Case Studies from Egypt and Saudi Arabia
Authors: Mansour Mahmoud M. , Ibrahim Mona G. , Fujii Manabu , Nasr Mahmoud
Published: August 2022

Flash floods are severe natural disasters due to their suddenness, frequency, and destruction. Every year, flash floods occur in Egypt and Saudi Arabia, which are located in the heart of the Middle East. Extensive areas in Egypt and Saudi Arabia are covered by mountainous topography. Intense rainfall can generate flash floods with their magnitude dependent on geomorphology and storm characteristics. Flash flood hazard assessment is a feasible way to mitigate potential damage and losses. Illumination, review, and comparison of assessment techniques of flash flood hazards represent an urgent necessity to evaluate advances and challenges in this discipline. Google-scholar and Scopus were used to collect 50 recent scientific papers, most of them published between 2011 and 2021, using the keywords: floods, hazards, assessment, Egypt, Saudi Arabia. Remote Sensing (RS) and Geographic Information systems (GIS) are the cornerstones of these studies, which include the Digital Elevation Model (DEM) and geoprocessing tools. The two items facilitate the calculation of morphometric parameters. Dividing the area and determining the hazard level were the main steps in flash flood hazard assessment. The considered studies relied on varied sets of morphometric parameters that ranged from 3 to 24 morphometric parameters. Area, ruggedness ratio, basin shape index, stream frequency, slope index, and drainage density are the common parameters in the assessment of flash flood hazards. In a flood zone, buildings made from brick have better sustainability in terms of both global warming mitigation and life cycle cost than other materials. Future studies are essential to illustrate the relationships between different morphometric parameters and flash flood hazard degree through field data and define a reliable unified set of morphometric parameters to assess the flash flood hazard degree.
Comparison of the Test Results on Flat Slabs Weakened by Openings with Punching Shear Capacities Assessed by the Model in the 2nd Generation of EC2
Authors: Kormosova Ľudmila , Augustín Tomáš , Halvonik Jaroslav
Published: August 2022

The paper deals with a comparison of the punching shear capacities of the experimental flat slabs without shear reinforcement weakened by openings adjacent columns with the results obtained by the prEC2 model for prediction punching capacity that is introduced in the second generation of Eurocode 2. Within the experiments, 4 slabs with dimensions of 2.5 m x 2.5 m and with a thickness of 200 mm and 8 slabs with a thickness of 250 mm were tested and evaluated. Specimens with a thickness of 200 mm were supported by an elongated column with dimensions of the column’s cross-section 950 x 150 mm and the second set of specimens with a square column with a dimension of 200 mm. The position of openings around the perimeter of the column as well as the distance from a column face were changing. Assessed punching shear capacities and their comparison with laboratory tests show that the prEC2 model significantly underestimates punching capacity when the opening is located at the face of support or near the shorter side of the elongated column if the reduction of the control perimeter length is steering by a radial projection of the opening.
The Impact of Nanofluid on Natural Convection in an Isosceles Rectangular Container with a Heat Source
Authors: Abdelkrim Bouras , Taloub Djedid , Amroune Amina , Driss Zied
Published: August 2022

The development of modern technology in microelectronics and power engineering requires the creation of efficient cooling systems. This is made possible by the use of special fin technology inside the cavity or special heat transfer Ethylene glycol-copper nanofluids to intensify the heat removal from the heat-generating elements. A numerical study of the natural convection of stationary laminar heat transfers in a closed rectangular cavity with a local source of internal volumetric heat generation. For different Rayleigh numbers and different volume fractions of nanoparticles. The system of equations governing the problem was solved numerically by the fluent computer code based on the method of finite volumes. Based on the Boussinesq approximation. Interior and exterior surfaces are maintained at a constant temperature. The study is carried out for Rayleigh numbers ranging from 104 to 106. The effects of different Rayleigh numbers and volume fractions of nanoparticles on natural convection have been studied. The results are presented as isotherms, isocurrents, and local and mean Nusselt numbers. The aim of this study is to see the influence of the thermal Rayleigh number and the volume fraction of the nanoparticles on the rate of heat transfer.
Verification of the Effect of Concrete Overlay for Strengthening Flat Slabs against Punching
Authors: Čereš Daniel , Gajdošová Katarína
Published: August 2022

This article aims to verify the possibility of strengthening existing flat slabs against punching by concrete overlay and the effectiveness of this type of strengthening. The method of strengthening by concrete overlay was verified on a theoretical level using the currently valid Eurocode 2 and other standards. A non-linear analytical model was developed in Atena 3D software, and the results of this model were compared with previous results from calculations according to the valid standards. The article also contains previous research results of Hugo Fernandes, who dealt with a similar type of strengthening method and this research was also based on experimental study. An important aspect is the detailing of the interface between the two concrete layers namely the roughening the existing surface or the use of studs, which ensure a minimum longitudinal displacement of the two layers. Two non-linear model approaches were presented. The results based on nonlinear analysis show that when using a simple model of two macroelements and defining the parameters of one interface, the punching shear resistance is higher than the actual resistance, in this case by of about 13% on the dangerous side.
Dynamic Characteristics of a 5-kN Thrust Gas Turbine Front Bearing Composed of a Vibration Absorber Element and Deep Groove Ball Bearing
Authors: dos  Santos Bertolino Junio , Sacrini Damásio , Rodrigues Adilson Vitor , Creci Geraldo , Menezes João Carlos
Published: August 2022

Rolling bearings enable the development of high rotational speeds with a good load-bearing capacity and low frictional resistance. Therefore, rolling bearings can be used on a wide variety of rotating machines. This study investigated the dynamic stiffness and damping coefficients of the front bearing of a 5-kN thrust gas turbine. A Barden® 206(T) deep-groove ball bearing was the main part of the front bearing. Computational models were developed using MATLAB® for both the structural dynamics problem governed by Hertzian contact theory and the lubricated problem governed by elastohydrodynamic theory. In addition, the front bearing was composed of a vibration absorber element, which was also considered. Finite element analysis was performed on both the ball bearing and the vibration-absorbing element to assist in its final characterization. As the main results, the stiffness and damping dynamic coefficients of the front bearing were estimated and can be used to predict the rotordynamic behavior of the aeronautical gas turbine rotating set to avoid possible vibration problems during operation.
The Effectiveness Evaluation of Sacrificial Anode in Reinforced Concrete that has been Installed for One Year
Authors: Isra Muhammad , Huzni Syifaul , Israr Bin M. Ibrahim , Fonna Syarizal
Published: August 2022

Generally, reinforcing steel in concrete is protected from corrosion. This happens because the cement content in the concrete has an alkaline effect. It can reduce the risk of corrosion, but the reinforcing steel may still corrode if exposed to a corrosive environment. One method of providing a high protection value against corrosion is the sacrificial anode cathodic protection system. This study aims to evaluate the effectiveness of the sacrificial anode cathodic protection on reinforced concrete. Three types of specimens were used in the study. The specimens were (a) unconnected anode-cathode specimen, (b) connected anode-cathode (design 1), and (c) connected anode-cathode (design 2). The dimensions of the concrete specimen are 1000 mm in length, 100 mm in width, and 100 mm in height. Profometer 5+ was used to locate the reinforcing steel in the concrete. In this study, the condition of the protected criteria of reinforced concrete was achieved within 30 weeks in 2019 after wet-dry cycle treatment in 3.5% NaCl media, and thus, the specimen was exposed in an open air for one year. In 2020, all of the specimens were treated again with a wet-dry cycle for 3 weeks to measure the potential value of the reinforcing steel after a year. The measurement result of the corrosion potential value after one year showed that the specimen (c) had a potential value of -884.67 mV. While the specimen (b) had a potential value of -689 mV. These results show that the specimen (c) still within the protected criteria based on the NACE standard after one year of exposure, whereas the specimen (b) is no longer protected after one year of exposure.
Experimental and Numerical Comparison of the Concrete Slabs Reinforced with Composite Rebars
Authors: Benko Vladimír , Kováčik Miroslav , Valašík Adrián
Published: August 2022

The evaluation of non-metallic reinforcing in slender concrete slabs is discussed in this article. The experimental campaign investigated the flexural behavior and the bending capacity of concrete slabs reinforced with Glass fiber reinforced polymer bars. A total of 6 slabs with a length of 1.36 m and cross-sectional dimensions of 0.50 x 0.04 m were tested until failure. The effective depth and reinforcement ratio are the same for all slabs. With an effective span of 1.3 m, the slabs were simply supported and tested in a four-point bending experimental setup. ATENA 3D, a finite element nonlinear solver, was used to simulate the experimental approach. The meshing was done using brick elements, and the calculation was performed with the Newton-Raphson method. The article compares the experimental program and nonlinear analysis performed in ATENA 3D program. The theoretical analysis outcomes are also introduced by calculating the deflection of the slab in the midspan. The correlation and a good agreement between numerical results and experimental outcomes are presented in the paper.
The Role and the Importance of Technical Supervision in Czech Construction Industry Focused on Concrete Structures
Authors: Suchánek Petr , Kosturová Andrea
Published: August 2022

The article deals with the role and importance of supervision in the Czech construction industry. It accentuates its role in public procurement and provides a comprehensive view of its activities. The article also clarifies the function, content and duties of supervision with regard to concrete structures or the importance of supervision of the construction life cycle.Currently, during the time the Czech construction industry is almost at the peak of its staff and material capacities, the main topic between the Employer and the Contractor is the ratio of quality and price of construction. This ratio can never be determined exactly, but it can be checked and monitored during the actual course of construction. Among other things, the position of technical supervision is included between these two entities. Emphasis should be placed on independence, technical expertise and competence in the performance of supervision. If these requirements are to be fulfilled, it is mainly external supervision, i.e. supervision by external persons (legal entity).
The Failure Analysis of Crankshaft of Four Cylinder Diesel Engine Using Experimental Method
Authors: Husaini Husaini , Rizqullah Akbar , Hasanuddin Iskandar , Muammar Sadrawi
Published: August 2022

The crankshaft is one of the main components of the combustion engine used for continuous rotation. Therefore, this research aims to analyze the crankshaft failure of a jeep with a four-cylinder diesel engine used to transport 4 tons of logs on rugged terrain and uneven roads for 12 months. This research was carried out using the Scanning Electron Microscope (SEM), microstructure, hardness, chemical composition, and stress analysis testing methods. The chemical composition and microstructure test results showed that the crankshaft was made of AISI 3150 material with a pearlite phase. From the results of the visual observation on the fracture surface, the characteristics of failure due to fatigue are indicated by a beach mark pattern on the fracture surface. SEM test shows a crack initiation at the edge of the balancer due to the dynamic loads experienced by the crankshaft, which causes propagation from the initial beach marks pattern to the final fracture.
Finite Element Analysis of the Beam-Bond Test of Steel and GFRP Bars with Concrete
Authors: Štefanovičová Michaela , Sonnenschein Robert , Gajdošová Katarína
Published: August 2022

The ecological thinking and the development of new materials foreground the composite structures made of FRP (fiber reinforced polymers) and concrete. Before the use in real concrete structures, the material characteristics and composite action with concrete need numerical, analytical, and experimental evaluation. The key to developing the composite action of an FRP reinforcement in concrete is a sufficient bond between the reinforcement and concrete. The GFRP (Glass Fiber Reinforced Polymer) bars as the most common and affordable alternative to steel bars are used in this study to investigate the bond with concrete on the analytical model. The finite element model simulates the beam-bond test of GFRP and steel bars to concrete. The effect of bar diameter and type of reinforcement on the bond behavior are analyzed. Finally, the results obtained from the analytical model are compared with the experimental results from the literature.
Flexural Strength and Physical Properties of Cement Board Reinforced with Abaca Fiber
Authors: Iqbal Mohd , Azan Said Amir , Rahmadtullah Rizki , Abhang Laxman B.
Published: August 2022

Cement panels are industrial products that are widely used as construction and insulation materials. In general, cement panels are reinforced with synthetic fibers. In this study, a cement panel reinforced by natural fibers, namely abaca fiber, was developed. Abaca fiber has advantages over other natural fibers in terms of availability, mechanical properties and physical properties. Cement panels were made in several levels of abaca fiber content (0%, 1%, 2%, 3% and 4%) to study the effect of fiber content on the flexural strength and physical properties of cement panel. The material and experiment were prepared and carried out according to Indonesia standard SNI 01-4449-2006. The result of the experiment showed that the fiber content significantly affected the flexural strength, density, moister content, water absorption and thickness development of abaca-cement panels. The maximum flexural strength was 71.88 MPa, produced by cement panel with 3% fiber content, and it was 2.15 time higher than cement panel without fiber. The result of the experiment indicated that the abaca fiber was potential inforcement for cement panel with respect to its flexural strngth and physical properties.
COMPARATIVE ANALYSIS OF CLINICAL AND LABORATORY DATA IN CHILDREN WITH MULTISYSTEM INFLAMMATORY SYNDROME ASSOCIATED WITH SARS-COV-2 IN THE REPUBLIC OF KAZAKHSTAN
Authors: Jaxybayeva Indira , Boranbayeva Riza , Abdrakhmanova Sagira , Maitbassova Raikhan , Ishuova Pakhitkanym , Bayesheva Dinagul , Maltabarova Nurila , Katarbayev Adyl , Umesheva Kumisgul , Marshalkina Tatyana , Manzhuova Lyazat , Abdilova Gulnara , Alimkhanova Gulshat , Yerzhanova Gulmira , Bulabaeva Gulnara , Zhanuzakova Nazgul , Anokhina Svetlana , Kuatbayeva Aigul , Gulnara Tashenova
Published: August 2022

Background and Objectives: Data with more severe mutations of the SARS-CoV-2 virus, compared with the original wild-type strain of COVID-19 disease, were reported worldwide. The study aims to describe the clinical and laboratory manifestations of a multisystem inflammatory syndrome in children (MIS-C) associated with SARS-CoV-2 in the Republic of Kazakhstan and to compare the severity of the disease depending on the time of the circulating variant of SARS-CoV-2 virus.
Material and methods: A retrospective, multicentre, nationwide study of 89 children with MIS-C who received inpatient treatment from August 1, 2020, to December 1, 2021. The patients were allocated into two groups: 1(2020)  - 45 children and 2 (2021) - 44 children. Study periods were characterized by the circulation of different strains of the SARS-CoV-2 virus.
Results: In children with MIS-C in 2021, acute renal failure, disseminated intravascular coagulation syndrome, and shock were statistically more frequently found, which led to fairly common admittance to the intensive care unit. When comparing laboratory data, the children with MIS-C in 2021 had higher values ​​of inflammation markers: ferritin, procalcitonin, erythrocyte sedimentation rate, leukocytes, and neutrophils. Furthermore, these children had a lower level of lymphocytes than children with MIS-C in 2020.
Conclusions: MIS-C is a severe, life-threatening systemic disease characterized by multiple organ damage and important inflammatory changes in laboratory parameters. A more aggressive clinical course of MIS-C in 2021 may be associated with the emergence of new SARS-CoV-2 strains.
Keywords: children, MIS-C, variants of SARS-CoV-2
Acquired Sideroblastic Anemia: An exploratory Comparative Statistical Analysis Between Clonal and Non-clonal cases
Authors: Soliman Dina Sameh , Kohla Samah , Fareed Shehab , Akiki Susanna , Amer Aliaa , Ganwo Ibrahim , Chandra Prem , El-Omri Halima , Ibrahim Feryal
Published: August 2022

Sideroblastic anemia (SA) is a rare heterogenous group of inherited and acquired bone marrow disorders. We retrospectively studied the clinicopathologic characteristics, cytogenetic findings, and disease outcome of patients with acquired sideroblastic anemia (ASA) and performed a comparative analysis between clonal and non-clonal cases. 15 patients of ASA were detected: clonal SA (10 cases, 66.7%) including MDS, MDS/MPN, AML and t-MNs with ring sideroblasts) and SA secondary to non-clonal causes (5 cases; 33.3%), including copper deficiency (2 sideroblastic anemia, copper deficiency, non-clonal sideroblastic anemia cases), pyridoxine deficiency diagnosed during pregnancy, and 2 patients with idiopathic SA.Key
Keywords: sideroblastic anemia, copper deficiency, non-clonal sideroblastic anemia
Confined sheared flows of hard and soft granular materials: Some challenges in tribology and fault mechanics
Authors: Mollon Guilhem , Quacquarelli Adriana , Zhang Yinyin , Casas Nathalie , Bouillanne Olivier , Madrignac Alizée , Daigne Kevin
Published: August 2022

This paper belongs to a Focus Series dedicated to Challenges in Granular Matter. As such, it does not report any new finding, but rather offers an overview of the state of the art and of current and future challenges for the granular physics community. The focus is placed on the case of confined sheared flows of granular samples with particular complexities, such as soft, angular, or cemented grains, with applications in tribology and fault mechanics. We first explain why granular science may help to improve our understanding of dry friction in these two applications, and illustrate some recently unveiled aspects regarding the complexity of the problem. We then describe a few avenues for future research on the topic, focusing on the dialogue between simulations and experiments, on scale-related challenges, and on some pivotal computational aspects.
Corrosion properties of tempered medium carbon steel in 1.0 M HCl and homemade vinegar
Authors: Samuel Nwigwe Uzoma , Ikechukwu Nwoye Chukwuka , Aroh Ajah Stephen , Kalu-Uka Godwin , Yibowei Moses , Divine Onuoha Kalu
Published: August 2022

ABSTRACT. The consumable palm wine has never been used in heat treatment process of steels. This research therefore focuses on the utilization of the consumable palm wine and other palm tree products as quenchants. The mechanical and physical properties of the samples were also evaluated to determine which of the quenchants that influences the hardness and corrosion rate values of medium carbon steel the most. The corrosion test was performed in 1.0 M of HCl solution and homemade vinegar using potentiodynamic polarization method. The results revealed a hardness value of 431, 351, 359 and 265 HB for the samples quenched in palm wine, palm kernel oil, palm oil and as-received, respectively. The corrosion rates of palm oil tempered samples showed more susceptibity to corrosion in HCl solution with a value of 2.261e+003 mil/year. Vinegar offers the highest corrosion rate with a value of 4.017e+002 mil/year for palm wine tempered. The corrosion rate of the as-received samples pulled the lowest values while on the treated samples, palm kernel oil showed the least corrosion rate values.

 

KEY WORDS: Consumable palm wine, Palm oil, Hardness, Corrosion rate, Austenitization, Quenching

 

Bull. Chem. Soc. Ethiop. 2022, 36(4), 893-901.                                                              

DOI: https://dx.doi.org/10.4314/bcse.v36i4.14
A study on the development of scaffold fabrication using citric acid polyester – nanohydroxyapatite composite
Authors: Indira R. , Jaisankar V. , C. Vella Durai S.
Published: August 2022

ABSTRACT. Nano hydroxyapatite (n-HAp) and its composites have shown a great development in the field of tissue regeneration and in controlled drug delivery due to its good biocompatibility and bioactivity behavior. Furthermore, HAp-based nanocomposites enhance mechanical properties. These synthetic HAp nanocomposites can also be tailored to fabricate scaffold with controlled porosity which facilitate the growth of the cell in the field of tissue engineering. In this paper, we focus on the synthesis of nano hydroxyapatite (n-HAp) by sol-gel method. The synthesized nano powders were calcined at 500 oC and characterized by FT-IR, XRD and TEM. We have also described the synthesis of citric acid-based polyester by melt polycondensation method without adding catalyst. The monomers used were citric acid, 1,6-hexane diol and sebacic acid. The corresponding synthesized n-HAp/polyester composite have potential application in soft tissue engineering. The structures of polyester and its nanocomposite were studied by FT-IR and 1H NMR spectral studies. The thermal and mechanical properties of polyester, composites and cytotoxicity activity (MTT assay) using vero cells were also studied. Porous scaffold of the nano HAp/Polyester was fabricated by solvent-casting particulate leaching technique which is useful in the development of tissue engineering applications. SEM and TEM studies were carried out for nano HAp, polyester, composites and scaffold.

 

KEY WORDS: Cytotoxicity, Polycondensation, Sol-gel, Solvent-casting, Tissue engineering

Bull. Chem. Soc. Ethiop. 2022, 36(4), 923-934.                                                               

DOI: https://dx.doi.org/10.4314/bcse.v36i4.17