bluuebunny/crossref_metadata_2025_split huggingface dataset:
New Models for Estimation of Diffuse Solar Radiation for Warri, Nigeria
Authors: Akpootu D.O. , Salifu S.I. 
Published: April 2024

This study utilized a 22-year dataset (2001-2022) comprising monthly average daily global solar radiation, diffuse solar radiation, relative humidity, atmospheric pressure, wind speed, and mean temperature for Warri (Latitude 5.52 oN, Longitude 5.73 oE and 6.10 m above sea level). Nineteen models, categorized into modified Page, Liu, and Jordan models; clearness index and one variable models; two variable models; three variable models; and four variable models, were developed and statistically tested using the following validation indices of Mean Bias Error (MBE), Root Mean Square Error (RMSE), Mean Percentage Error (MPE), t-test, and coefficient of determination (R2). Among the models, the linear page model from the modified Page, Liu, and Jordan category, the model that relates the diffuse solar radiation with clearness index and mean temperature for clearness index and one variable models, the model that relates wind speed and atmospheric pressure for two variable models, and the model that relates wind speed, atmospheric pressure and relative humidity for three variable models were found more appropriate. Upon ranking the best-performing models from each category, the model that relates that diffuse solar radiation with clearness index and mean temperature performed best as the most suitable model for estimating diffuse solar radiation in Warri.
Effect of <i>Polyalthia Longifolia</i> Leaf Extract on Uterine Function Indices of Female Wistar Rats
Authors: Abdullahi T.O . , Yakubu M.T. , Suleiman A.I. , Ahmad A.I. , Abdulazeez B.O. , Muhammad B. , Onemola K.R. , Obansa U.O. , Ahmed T.M. 
Published: April 2024

The bark of Polyalthia longifolia plant is commonly used in the treatment of various diseases like diabetes, malaria and many others. In this research, phytochemical screening and effects of the aqueous extract of P. longifolia leaves on the uterine function indices of female Wistar rats were investigated. Phytochemical analysis of the extract was performed using standard methods. The animals were randomized into four groups (Control A, B, C and D) of five rats each. Animals in the control group were given 1ml of distilled water daily, for 30days. While those in groups B, C and D were administered with the same volume of 50, 100 and 200mg/kg body weight of the plant extract, respectively, for 30days as well. At the end of the administration period, the animals were sacrificed 24 hours after the last day of administration. Uterine function indices were evaluated afterwards. Phytochemical screening indicated the presence of saponins, flavonoids, tannins, phenolics, cardiac glycosides, steroids, anthraquinones, phlobatannins and alkaloids while terpenoids were not detected. The extract at a moderate dose of 100mg/kg body weight gave a significant increase and decrease (P<0.05) in uterine glucose and uterine cholesterol respectively; it also revealed a significant increase and decrease(P<0.05) in alkaline phosphatase activity and total protein, when compared with the control. In general, it could be inferred that the aqueous extract of P. longifolia leaves possesses fertility enhancing potentials with regards to the uterus and uterine function indices.
Response surface optimization of lipase production by <i>Pseudomonas sp.</i> on a low-cost shea-nut cake using solid state fermentation
Authors: Kazeem M.O. , Mayaki M.A. , Musa D. 
Published: April 2024

Shea nut cake (SNC) is the solid residue produced after the shea butter extraction process. The SNC could provide a low-cost substrate for bacterial lipase production. Greater yield are among the benefits Solid State Fermentation (SSF). However, there have been less instances of lipase production by bacteria than fungi in SSF. The current study aimed at improving bacterial lipase production on SNC in SSF using Response Surface Methodology. Lipase-producing bacteria (LPB) were isolated from the shea butter mill effluent pond and screened for lipase production on a tributyrin agar plate. The influence of four independent parameters (temperature, pH, moisture content and biosurfactant) on lipase production was studied using Box Behnken Design (BBD) of RSM. Results showed that isolate AO (Pseudomonas sp.) displayed the highest zone of hydrolysis 2 (53 mm). A quadratic regression with R = 0.931 showed that the model is best fitting, and predicted the optimum conditions of significant (P>0.05) growth parameters, including temperature at 40°C, moisture content at 50%, and biosurfactant at 2 mL, which produced 408.25 U/g of experimental lipase. The findings indicate that the model was useful for predicting optimal growth conditions for incresing lipase production in SSF and the low-cost agro- industrial SNC could be a promising substrate for industrial applications.
Lithological discrimination and mapping in part of the upper Benue Trough using Landsat 8
Authors: Abodunrin O.A. , Fagbohun B.J. , Anifowose A.Y.B. 
Published: April 2024

This study focused on evaluating the efficiency and complementarity of image enhancement techniques for lithological discrimination and mapping in the upper parts of Benue Trough using Landsat 8 data. To achieve this, image enhancement techniques such optimum index factor, band ratio, principal component analysis, and minimum noise fraction were applied on Landsat 8 OLI data covering parts of the Upper Benue Trough. False colour composites (FCC) were created from three most informative derivatives of these image enhancements. The FCCs were compared in terms of their capability to differentiate different lithological units in the study area by comparing the FCCs with existing geological map. The results show that the FCC created from band ratios provided the highest amount of information, while those created based on optimum index factor provided the least amount of information with respect to lithological discrimination. Additionally, it was observed that the FCCs created from the derivatives of band ratio, principal component analysis and minimum noise fraction provide complementarity. Thus, the three FCCs from these three enhancement methods were fused into a single image, which further aided lithological discrimination. By combining the outputs from three image enhancement techniques, most of the sedimentary and crystalline rocks in the study area were successfully delineated. The method adopted in this study particularly the fusion of outputs from band ratio, principal component analysis and minimum noise fraction represents a novel approach that is suitable for lithological mapping in remote areas, particularly arid and semi-arid terrains with considerable rock exposure.
Production of vinegar from waste fruits using <i>Acetobacter</i> species
Authors: Paul S.K , Wartu J.R. , Orukotan A.A. 
Published: April 2024

Vinegar is an organic substance that contains about 5% acetic acid and is made from the oxidative fermentation of alcohol by acetic acid bacteria. The aim of this study was to produce vinegar from the juices of waste fruits. Proximate and physicochemical analysis was carried out on the juices of orange, sugarcane, tomato, and pineapple using standard techniques. Twenty-one (21) species of acetic acid bacteria were isolated and identified using glucose-yeast-Calciumcarbonate (GYC) agar. The juices were fermented for 7 days using Saccharomyces cerevisiae, and subsequently, for 28 days, four alcohol-tolerant Acetobacterspecies were selected and inoculated into the fermenting media. The produced vinegar was sensory evaluated, following a nine-point hedonic scale. The antibacterial and antifungal effects of the vinegar were tested on fresh cabbage at various contact times (0, 5, and 10 min) and concentrations (5, 10, and 15 % v/v). The physicochemical parameters analyzed in fermentation using S. cerevisiae showed a decrease in pH, specific gravity, and brix, while the percentage of alcohol content increased. As the fermentation using Acetobacter species progressed, pH further decreased, titratable acidity increased in a range of 6.6-7.7%, and specific gravity also decreased while specific gravity increased in Acetic acid fermentation. Sensory evaluation showed a score range of 5.7–6.8 for pungency, 6.8–7.4 for appearance, 6.4–7.9 for aroma, 5.8–7.4 for taste, and 6.9–7.9 for acceptability. The best results for bacterial and fungal loads 5 on cabbage were at a concentration of 15% at 10 min. Drastic reduction of bacterial load was from 2.07×10 to 4 4 3 2.7×10 CFU/g, while fungal load reduced from 4.9×10 to 6.7× 10 CFU/g. To evaluate significance, an ANOVA was performed (p<0.05) and Duncan's test was used for multiple comparisons. Vinegar was successfully tested to be effective as an antimicrobial agent. Future research should look into process optimization, strain improvement, and the adoption of agro-allied wastes for biotechnology.
PENGARUH BUDAYA ORGANISASI DAN DISIPLIN KERJA TERHADAP KINERJA KARYAWAN DENGAN KOMITMEN ORGANISASI SEBAGAI VARIABEL INTERVENING (Studi pada Kantor Kecamatan Bojongsari, Kota Depok, Jawa Barat)
Authors: Syanan Viola Andrianti , Magdalena Pamela 
Published: April 2024

Tujuan dari penelitian ini adalah untuk menganalisis pengaruh dari budaya organisasi dan disiplin kerja terhadap kinerja karyawan melalui komitmen organisasi sebagai variabel intervening pada Kantor Kecamatan Bojongsari, Kota Depok, Jawa Barat. Populasi penelitian ini adalah karyawan Kantor Kecamatan Bojongsari, Kota Depok, Jawa Barat yang berjumlah 125 orang. Jumlah sampel dalam penelitian ini berjumlah 35 karyawan. Metode yang digunakan dalam penelitian ini adalah metode analisis deskriptif kuantitatif dengan menggunakan alat ukur skala likert. Teknik pengumpulan data melalui kuesioner yang diajukan peneliti kepada responden. Data diolah menggunakan IBM SPSS 25.0. Pengujian validitas dan reabilitas menggunakan uji pearson product moment dan statistik Cronbach Alpha. Metode analisis untuk menjawab hipotesis menggunakan Path Analysis atau Analisis Jalur. Hasil penelitian menunjukkan bahwa budaya organisasi negatif dan tidak signifikan berpengaruh terhadap kinerja karyawan, disiplin kerja positif signifikan berpengaruh kinerja karyawan, komitmen organisasi negatif dan tidak signifikan berpengaruh terhadap kinerja karyawan, budaya organisasi berpengaruh positif dan signifikan terhadap kinerja karyawan melalui komitmen organisasi serta disiplin kerja tidak berpengaruh positif dan tidak signifikan terhadap kinerja karyawan melalui komitmen organisasi.Kata Kunci: Budaya Organisasi, Disiplin Kerja, Komitmen Organisasi, Kinerja Karyawan
ANALISA PERPUTARAN PERSEDIAAN TERHADAP PROFITABILITAS PADA PT KALBE FARMA TBK CEMPAKA PUTIH – JAKARTA
Authors: Simbolon Mangapul , Rahmah Hikmah , Pudiastuti Elisabeth Tanti , Yusril Muhammad , Prihantati Meini 
Published: April 2024

Penelitian ini dilakukan pada PT. Kalbe Farma Tbk. Adapun tujuan penelitian ini adalah Untuk mengetahui pengaruh perputaran persediaan terhadap profitabilitas pada PT. Kalbe Farma Tbk.Teknik analisis data yang digunakan dalam penelitian adalah analisis regresi linier sederhana dengan menggunakan program SPSS versi 25 yaitu dengan hasil Y = 26,494 + (-0,054) X yang digunakan untuk mengetahui besarnya hubungan variabel bebas terhadap variabel terikat.Berdasarkan hasil analisis menggunakan program SPSS menunjukkan bahwa perputaran persediaan tidak berpengaruh signifikan terhadap profitabilitas pada PT. Kalbe Farma Tbk. Hal ini dibuktikan dengan thitung ttabel yaitu -0,807 3,182. Nilai R2 sebesar 0,623, yang berarti bahwa sebesar 62,3% variabel profitabilitas dapat dijelaskan oleh perputaran persediaan. Sedangkan sisanya sebesar 37,7% dipengaruhi oleh variabel lain yang tidak dijelaskan didalam model penelitian ini.Kata Kunci : Persediaan dan Profitabilitas
ANALISIS MOTIVASI KERJA TERHADAP KINERJA KARYAWAN OUTSOURCING PADA PT. GANDA MADY INDOTAMA
Authors: Mustakim Mustakim , Idaman Syukrio , Januarianto Benedictus Tri , Susilo Maulkre Her , Hakim Maulana Arief Rachman 
Published: April 2024

Profesional secara sederhana dapat diartikan sebagai kemampuan dan keterampilan seseorang dalam melakukan pekerjaan menurut bidang dan tingkatan masing-masing. Kinerja Karyawan Outsourcing adalah tingkat pencapaian hasil kerja atas pelaksanaan tugas tertentu dalam hal ini mencakup kinerja individu karyawan. Adapun tujuan penelitian ini adalah untuk mengetahui besarnya pengaruh variabel Motivasi Kerja terhadap Kinerja Karyawan Outsourcing pada PT. Ganda Mady Indotama Jakarta .Teknik pengambilan sampel yang dipakai dalam penelitian ini penulis menggunakan teknik Total Sampling (Secara Sensus). Dimana setiap populasi mempunyai peluang yang sama untuk dipilih sebagai sampel secara keseluruhan 100% akan di jadikan sampelnya.Berdasarkan hasil analisa regresi bahwa ternyata variabel Motivasi Kerja dapat meningkatkan Kinerja Karyawan Outsourcing diperoleh nilai persamaan Y = 7,368 + 0,901 X, ada pengaruh positif terhadap Kinerja Karyawan Outsourcing diperlukan pembuktian dengan uji hipotesis diperoleh nilai thitung sebesar = 16,146 nilai ttabel pada (52) sebesar = 1,680, maka Ho ditolak dan Ha diterima berarti mempunyai bukti, bahwa Motivasi Kerja terhadap Kinerja Karyawan Outsourcing terdapat pengaruh yang sangat signifikan. Berdasarkan hasil analisa terdapat pengaruh positif Motivasi Kerja terhadap Kinerja Karyawan Outsourcing diperoleh nilai sebesar 0,913 sehingga dapat disimpulkan bahwa pengaruhnya sangat kuat atau nilai Koefisien determinasinya (KD) sebesar : 83,4%. Jadi tingkat pengaruh sebesar 83,4% dan sisanya sebesar 16,6% dipengaruhi faktor lainnya yang tidak diamati oleh penulis. Kata Kunci: Motivasi Kerja dan Kinerja Karyawan.
Formation of a model of interaction of an export-oriented enterprise in the African market together with enterprises of the EAEU and BRICS countries
Authors: Демина Д. Е. 
Published: April 2024

Основной целью исследования является разработка управленческих механизмов для формирования модели сотрудничества между предприятиями, нацеленными на работу в условиях африканского рынка, для укрепления позиций на мировой экономической арене, расширения рынков сбыта и увеличения объемов экспорта. Изучены проблемы и потенциал сотрудничества отечественных предприятий на африканском рынке с предприятиями из стран ЕАЭС и БРИКС. Определены перспективы сотрудничества с Африканскими континентом. Разработаны механизм принятия решения о выборе метода проведения экспортных операций с организациями стран ЕАЭС и БРИКС в африканские страны и механизм анализа эффективности взаимодействия предприятия с иностранными контрагентами из данного региона.
The main purpose of the study is to develop management mechanisms for the formation of a model of cooperation between enterprises aimed at working in the conditions of the African market, in order to strengthen their positions on the world economic arena, expand sales markets and increase exports. The research goals were achieved by studying the problems and potential of cooperation between domestic enterprises in the African market with enterprises from the EAEU and BRICS countries. The prospects and benefits of cooperation with the African continent have been identified. A mechanism for deciding on the choice of a method for conducting export operations with organizations of the EAEU and BRICS countries to African countries and a mechanism for analyzing the effectiveness of the company’s interaction with foreign contractors from the African region have been developed.
Environmental aspects of sustainable development of territories
Authors: Быкова М.Л. 
Published: April 2024

В статье анализируются экологические аспекты устойчивого развития территорий. Приводится обзор работ отечественных и зарубежных авторов, посвященных проблеме анализа. Несмотря на различные взгляды на устойчивое развитие и факторы его формирования, все исследователи отмечают важность учета экологической составляющей в развитии территорий различного уровня. Регрессионный анализ динамики отдельных статей природоохранных расходов позволяет сделать вывод о линейном характере изменения признака с течением времени. Все модели являются статистически значимыми. Высокое значение коэффициента детерминации позволяет сделать вывод о возможности их практического применения. Полученные результаты регрессионного анализа могут быть применены властными структурами всех уровней при построении стратегий управления устойчивым развитием территорий.
This article analyzes the environmental aspects of sustainable development of territories. The paper provides an overview of the works of domestic and foreign authors devoted to the problem of research. Despite the different views on sustainable development and the factors of its formation, all researchers note the importance of taking into account the environmental component in the development of territories at various levels. The regression analysis of the dynamics of individual items of environmental expenditures presented in the work allows us to conclude that the linear nature of the change in the attribute over time. All models are statistically significant. The high value of the coefficient of determination allows us to conclude that their practical application is possible. The obtained results of regression analysis can be applied by government structures at all levels in building strategies for managing sustainable development of territories.
Development of metrics for monitoring the budget of projects for the implementation of automated accounting systems
Authors: Замбржицкая Е.С. , Гафурова В.М. , Чуприн В.В. 
Published: April 2024

В статье рассмотрен вопрос разработки статей (метрик) для мониторинга бюджета проекта. Предложен состав классификационных признаков для построения различных вариантов (разрезов) бюджета. С целью снижения трудоемкости бюджетного процесса обоснована необходимость автоматизации. Отдельное внимание уделено особенностям бюджетирования именно проектов по внедрению автоматизированных учетных систем, которые выражаются в высоком влиянии рисков на стоимостные показатели бюджета. Предложено отказаться от точечных значений показателей бюджета в пользу интервальных с целью повышения качества бюджетного процесса.
The article considers the issue of developing articles (metrics) for monitoring the project budget. The composition of classification features for constructing various variants (sections) of the budget is proposed. In order to reduce the complexity of the budget process, the need for automation is justified. Special attention is paid to the specifics of budgeting projects for the implementation of automated accounting systems, which are expressed in the high impact of risks on the cost indicators of the budget. In order to take into account the impact of these risks, it is proposed to abandon point values of budget indicators in favor of interval values in order to improve the quality of the budget process.
Management of production systems: domestic and foreign experience
Authors: Козлов Я.В. 
Published: April 2024

В статье представлен обзор отечественного и зарубежного опыта управления производственными системами. Даны ключевые понятия в сфере производственных систем и выделяются их характерные особенности и признаки. Рассматривается эволюционирование системных концепций в управлении производственными системами, представлены методологии бережливого производства, быстрореагирующего производства и активного производства, отличающиеся стратегической направленностью, зависимой от масштабов производства и отрасли, в которой компания ведет деятельность. Представлен опыт формирования систем управления промышленными системами на примере Японии, США и России.
The article provides an overview of domestic and foreign experience in managing production systems. The key concepts in the field of production systems are given and their characteristic features and features are highlighted. The evolution of system concepts in the management of production systems is considered, the methodologies of lean production, fast-reacting production and active production are presented, which differ in strategic orientation, depending on the scale of production and the industry in which the company operates. The experience of forming industrial control systems is presented on the example of Japan, the USA and Russia.
Assessment of the impact of digitalization on economic theory and practice
Authors: Чунихина Т.Н. , Золкин А.Л. , Свердликова Е.А. , Мамаев С.В. 
Published: April 2024

Исследование представляет собой анализ влияния цифровизации на экономическую теорию и практику. Авторы, опираясь на эмпирические данные и теоретические исследования, оценивают трансформации в экономических моделях и менеджменте, спровоцированные интеграцией цифровых технологий в различные сферы деятельности. Рассматривают цифровизацию как движущую силу экономического роста, инноваций и создания новых рабочих мест, одновременно обращая внимание на вызовы, такие как киберпреступность и неравенство в доступе к цифровым ресурсам. Методологическая основа исследования включает аккумуляцию данных о цифровизации, ВВП, производительности труда и инвестициях в цифровые технологии, последующую их трансформацию и анализ с использованием статистических методов, в том числе временных рядов и корреляционного анализа. Результаты показывают значительное влияние цифровизации на экономическую динамику, подтверждая необходимость адаптации экономической теории и практики к условиям цифровой эпохи.The study is an analysis of the impact of digitalization on economic theory and practice. The authors, based on empirical data and theoretical research, evaluate the transformations in economic models and management provoked by the integration of digital technologies into various fields of activity. They consider digitalization as a driving force for economic growth, innovation and job creation, while paying attention to challenges such as cybercrime and inequality in access to digital resources. The methodological basis of the study includes the accumulation of data on digitalization, GDP, labor productivity and investments in digital technologies, their subsequent transformation and analysis using statistical methods, including time series and correlation analysis. The results show the significant impact of digitalization on economic dynamics, confirming the need to adapt economic theory and practice to the conditions of the digital age.
Monetary policy of Russia in conditions of economic instability and external limitations
Authors: Дышекова А.А. , Циканова Л.М. , Зезаев М.Р. 
Published: April 2024

В статье рассматривается денежно-кредитная политика в условиях действия экономических санкций, определяется ее роль в обеспечении экономического развития и финансовой стабильности. В период структурной трансформации экономики денежно-кредитная политика государства должна будет адаптироваться под изменяющиеся внешние и внутренние условия развития. Главной задачей новой политики является стабилизация экономического и финансового состояния страны, постепенное ослабление инфляционного давления и стимулирование производства в новых условиях.
The article examines monetary policy in the context of economic sanctions and determines its role in ensuring economic development and financial stability. During the period of structural transformation of the Russian economy, the state’s monetary policy will have to adapt to changing external and internal development conditions. The main objective of the new policy will be to stabilize the economic and financial condition of the country, gradually weaken inflationary pressure and stimulate production in the new conditions.