bluuebunny/crossref_metadata_2025 huggingface dataset:
Multifractal Geometry of Slices of Measures
Authors: Selmi Bilel
Published: March 2021

The aim of this article is to study the behavior of the multifractal packing function under
slices
in Euclidean space. We discuss the relationship between the multifractal packing and pre-packing functions of a compactly supported Borel probability measure and those of slices or sections of the measure. More specifically, we prove that if

\mu

satisfies a certain technical condition and

q

lies in a certain somewhat restricted interval, then Olsen's multifractal dimensions satisfy the expected adding of co-dimensions formula.
Интерполяционные теоремы для нелинейных операторов в общих пространствах типа Морри и их приложения
Authors: Burenkov Viktor Ivanovich , Nursultanov Erlan Dautbekovich
Published: March 2021

Доказаны новые интерполяционные теоремы для достаточно широкого класса нелинейных операторов в пространствах типа Морри. В частности, эти теоремы применимы к интегральным операторам Урысона. Получены аналоги интерполяционных теорем Марцинкевича-Кальдерона, Стейна-Вейса, Петре. Установлен критерий $(p,q)$-квазислабой ограниченности оператора Урысона.
Об одном классе функционалов на весовом пространстве Соболева первого порядка на вещественной прямой
Authors: Prokhorov Dmitrii Vladimirovich
Published: March 2021

Дан ответ на вопрос, при каких условиях на измеримую по Лебегу на интервале $I\subset \mathbb R$ функцию $g$ отображение $f\mapsto \int _I g(x)(Df)(x) dx$ является непрерывным линейным функционалом на весовом пространстве Соболева первого порядка $W_{p,p}^1(I)$; получены оценки нормы этого функционала в $[W_{p,p}^1(I)]^*$.
Разложение по всплескам типа сплайнов в весовых функциональных пространствах
Authors: Ushakova Elena Pavlovna
Published: March 2021

Представлены системы всплесков Баттла-Лемарье натуральных порядков. Основным результатом является теорема о разложении элементов пространств типа Бесова и Лизоркина-Трибеля с весовыми функциями Макенхаупта локального типа с помощью базисов, порожденных системами такого вида. Всплески Баттла-Лемарье относятся к классу сплайнов и хорошо подходят для исследования операторов интегрирования.
Оптимальные пространства Кальдерона для обобщенных потенциалов Бесселя
Authors: Bakhtigareeva Elza Gizarovna , Gol'dman Mikhail L'vovich , Haroske Dorothee Diethild
Published: March 2021

Исследуются свойства пространств обобщенной гладкости, таких как пространства Кальдерона, которые включают в себя классические пространства Никольского-Бесова и многие их обобщения, и описываются дифференциальные свойства обобщенных бесселевых потенциалов, которые включают в себя классические потенциалы Бесселя и пространства Соболева. Ядра потенциалов могут иметь нестепенные особенности в окрестности начала координат. С помощью точных по порядку оценок модулей непрерывности потенциалов устанавливаются критерии вложений потенциалов в пространства Кальдерона и описываются оптимальные пространства для таких вложений.
Management of aquatic plants and their contributions to fisheries production in Ikere-Gorge, Iseyin, Oyo State, Nigeria
Authors: Ajagbe S.O.
Published: March 2021

Aquatic plants are important in freshwater ecosystems. They provide food, shelter, spawning and nursery grounds for fish. They are usually found  at the littoral parts of freshwater ecosystems. The abundance, distribution and diversity of aquatic plant of Ikere-gorge, Iseyin, Nigeria were  examined between January 2017 and December 2018. There are twelve fishing villages in Ikere-gorge and four villages were randomly selected. Aquatic plants were sampled and collected with the help of hired fishermen. The collected aquatic plant samples were identified at the Forest  Herbarium of the Forestry Research Institute of Nigeria with appropriate keys. This work identified 13 families and 23 species of aquatic plants.  Cyperaceae family recorded the highest (4) number of individual species while Salvinia molesta had the highest abundance in all the sampling sites. The ecological classification of the aquatic plants showed that 14 species are emergent; 7 species floating and 3 species submerged. Site C had the most abundance (9220) of aquatic plants, followed by site D (8490), site B (8130) and site A (7940). The gamma (γ) and beta (β) diversities were 23 and 0.01 respectively. The alpha (α) diversity included Dominance (0.08), Simpson (0.92) and Shannon-Wiener (2.72) respectively. These results show that Salvinia molesta and Najas guadalupensis are the most and least abundant aquatic plants in Ikere-gorge respectively; which may be due to  their ecological status. Moreover, management of aquatic plants is an integral part of fisheries management for sustainable fisheries. Therefore, their management is essential for the maintenance of aquatic biodiversity.

Key words: aquatic plants, diversity, emergent, floating, submerged
Assessment of 60Co gamma radiation on early phenological stages of two generations of OFADA rice
Authors: Adewusi K.M. , Showemimo F.A. , Nassir A.L. , Olagunju S.O. , Porbeni J.B.O. , Amira J.O. , Aderinola A.P.
Published: March 2021

Traditional Ofada rice varieties from South-West, Nigeria is preferred for its unique taste, aroma and massive potential for export but has low yield. Based on this background, two Ofada rice varieties, FUNAABOR 1 and FUNAABOR 2 were irradiated to create genetic variability as it affects vegetative traits. Seeds from the varieties were exposed to nine levels of 60Co gamma irradiation (0, 50, 100, 150, 200, 250, 300, 350 and 400 Gy). The seeds were nursed for 30 days before M1 seedlings were transplanted into a well tilled soil in a two factorial RCBD with three replicates. Selections from M1 plants were used to establish M2 plants generation. The results revealed diverse effects of 60Co gamma irradiation treatments on different plant vegetative traits. The establishment rates of M1 Ofada rice population were unaffected (p > 0.01) by increasing gamma irradiation from 0 to 300 Gy but decreased at 350 Gy. Above 300 Gy, tiller numbers, plant height, lodging incidence, leaf number, leaf length and leaf angle decreased significantly when compared with control (p < 0.01) in both generations (M1 and M2). Moderately tillered (10 tillers), tall plant (116.9 cm) obtained from 350 dosage rate recorded highest grain weight of 7.8 g per panicle. High phenotypic coefficient of variation (PCV) and genotypic coefficient of variation (GCV) promoted by the irradiation dosages in M1 selection indicate the extent of environmental influence. High broad sense heritability observed from leaf number, leaf angle, leaf length, leaf blade colour, basal leaf sheath colour and grain weight per panicle shows possibility of rapid genetic improvement of these characters through selection.
Growth response and feed utilization in Clarias gariepinus fingerlings fed diets supplemented with processed flamboyant (Delonix regia) leaf meal
Authors: Adesina S.A. , Agbatan O.D.
Published: March 2021

Expanding utilization of conventional fish feed ingredients by man and fish feed industries has necessitated consideration of cheaper and locally available alternatives. A 70-day feeding trial was conducted to assess the effect of substituting graded levels of sundried flamboyant (Delonix regia) leaf meal (SFLM) for groundnut cake on growth and feed utilization of 240 Clarias gariepinus fingerlings at six substitution levels of 0 (control), 20, 40, 60, 80 and 100% in 12 plastic aquaria (50 × 40 × 40 cm). Each dietary treatment was randomly assigned in two replicates each to the aquaria making 12 treatment units and each aquarium had 20 fish. SFLM supplemented diets and fish carcass were proximately analyzed using standard procedures. Mean weight gain (MWG), specific growth rate (SGR) and feed conversion ratio (FCR) were determined. Data obtained were analyzed using descriptive statistics and ANOVA at p ≤ 0.05. Crude protein was highest (68.89%) in fish fed with diet 4, least (64.61%) in fish fed with diet 1 (control) and significantly (p < 0.05) exceeded 60.54% of the pre-treatment fish carcass. Fish fed with diet 3 had significantly (p < 0.05) higher values of MWG (11.73 g), SGR (2.13%/day) and superior FCR (0.451) above which growth and feed utilization indices progressively declined with increase in the substitution level of SFLM. This study revealed that 40% substitution level of the SFLM resulted in the best growth and feed utilization in C. gariepinus. The study demonstrated the considerable potential of flamboyant leaf meal as an alternative protein source, therefore other processing methods are recommended to increase its utilization, reduce feed cost and maximize aquaculture profitability.
Antifungal effect of the cumulative application of biostimulant and fertilizers on young cocoa fruits rot at Tafissou site, Centre-East of Côte d'Ivoire
Authors: Oro Franck Zokou , Lallie Hermann-Desiré , Silue Souleymane , N’Dri Kouakou Manassé , Diallo Hortense Atta
Published: March 2021

The use of biostimulants as an alternative way to chemical, often toxic, remains one of the best approaches to control cocoa black pod disease caused by Phytophthora spp. This study has been carried out to evaluate the effect of biostimulant’s applications number and the cumulative action in case of applying previously fertilizers. The experimental design consisted of a Fischer block with six treatments (T01, T02, T1, T2, T3 and T4) and repeated three times. This design was replicated on two sites, one with previous fertilizer (DAE) and the other without previous fertilizer (DSE). Observations were made monthly on each test tree. The biostimulant Banzai was applied for 3 or 4 consecutive months depending on the treatment at each site. The data collected included the total number of cherelles produced and the number of rotten cherelles. From these, data were deduced the rates of healthy cherelles on which the Kruskal-Wallis test was applied to compare treatments between them and between sites. The results showed that four applications of the biostimulant with fertilizer provided better control than three applications without fertilizer. The results also showed that the majority of treatments at the DAE site were more effective than treatments at the DSE site. In conclusion, four applications Banzai coupled with fertilizer have achieved the best rates of healthy cherelles whatever the site. Regarding the cumulative effect of the previous fertilizer with Banzai, treatments of the site with the previous fertilizer were still better than the treatment site without fertilizer.
Improvement of sorghum productivity through introducing integrated soil fertility management options in the Northern Sudanian zone of Burkina Faso
Authors: Ouedraogo Jean , Serme Idriss , Pouya Mathias Bouinzemwendé , Sanon Sogo Bassirou , Ouattara Korodjouma , Lompo François
Published: March 2021

Agricultural intensification is a necessity to ensure food security in the Sahel countries. This study aimed at assessing the effects of technological packages of integrated soil fertility management on sorghum productivity. An experiment was set up in dispersed blocks design where each producer constituted a repetition. Fertilizers were applied using the microdose technique. The results showed that the best grain yields of sorghum are obtained with the technology combining stone bunds + zaï + NPK + urea with respectively 1428.70 kg / ha in 2018 and 1158.40 kg / ha in 2019. The grain yield gaps between the current farmers’ practice under stone bunds and ISFM packages varied from 5.66% to 44.45% in 2018 and from 25.15% to 53.80% in 2019. In the context of climate variability and climate change, these results show that water harvesting techniques such as stone bunds and the zaï, associated with microdose are viable and sustainable alternative for improving agricultural productivity.

L’intensification agricole est une nécessité pour assurer la sécurité alimentaire dans les pays du sahel. Cette étude avait pour objectif d’évaluer les effets de paquets technologiques de gestion intégrée de la fertilité des sols sur la productivité du sorgho. Pour ce faire, un dispositif en blocs dispersés a été mis en place en milieu paysan où chaque producteur constituait une répétition. Les paquets technologiques se composent des formules de fumures et/ou des techniques de conservation des eaux et des sols (CES). Les engrais ont été apportés selon la technique de la microdose. Les résultats ont montré que les meilleurs rendements grains du sorgho ont été obtenus avec la technologie cordons pierreux + zaï + NPK + urée avec respectivement 1428,70 kg/ha en 2018 et 1158,40 kg/ha en 2019. Les gaps de rendement grains entre la pratique actuelle des producteurs sous cordons pierreux et les paquets technologiques ont varié de 5,66% à 44,45% en 2018 et de 25,15% à 53,80% en 2019. Dans le contexte de la variabilité et des changements climatiques, ces résultats montrent que la collecte et la valorisation de l’eau à la parcelle à travers les cordons pierreux et le zaï, associée à la microdose est une alternative viable et durable d’amélioration de la productivité agricole.
Burn wound healing effects of the root hydroethanolic extract of Cochlospermum planchonii in mice
Authors: Metowogo Kossi , Fankibe Nakpane , Kantati Yendubé T. , Adi Kodjo , Darré Tchin , Eklu-Gadegbeku Kwashie , Aklikokou Kodjo A.
Published: March 2021

Cochlospermum planchonii is a plant traditionally used in Togo to treat burn wounds. The present study aimed at evaluating the effect of the root hydroethanolic extract of Cochlospermum planchonii on the skin burn wounds. Burns were induced in ICR mice by applying on the skin of the dorsal region with a metal stick (0.7 cm diameter) preheated at 100 °C for 10 seconds. Four (4) groups of 8 mice were formed, Control Group (I); Group II, III and IV treated respectively with C. planchonii gel 2.5%, 5%, and Brulex® (Zinc oxide 15% cream). The surfaces of the wounds were evaluated daily by the ImageJ software. Biopsies were performed on day six and twelve for hydroxyproline assays and histological examinations. On the 12th day, wound contraction rates were 44.12%, 67.82%, 66.68% and 69.32% respectively for Group I, Group II, Group III and Group IV. Hydroxyproline levels on day 12 were significantly higher in samples of animals treated with C. planchonii 2.5% and 5% (+114,93 ± 1,61 and +120,54 ± 7,22 of augmentation respectively, P<0.01 when compared to the control group). Histological examination confirmed these observations. C. planchonii root hydroethanolic extract could be a potentially natural remedy for burn wound.
Evaluation of the quality of "pure water" sold in Niamey, Niger
Authors: Mijitaba Sahirou Bachir , Laouali Mahaman Sani , Ayouba Mahamane Abdoulkadri , Hassane Adamou Hassane , Amadou Haoua , Manzola Abdou Salam , Garba Hassane Barhamou
Published: March 2021

In recent years, sachet water known as "pure water" has gained the confidence of the Nigerien public because of its low price, availability, convenience, and quality perception by consumers. This study highlights the impact of storage on the quality of pure water sold in Niamey. Thus, eleven of the twelve analyzed physicochemical parameters have been monitored during six weeks of "pure water" storage in the sun and at laboratory ambient temperature. From the results obtained, the physicochemical parameters are in norms except the turbidity and the residual chlorine. On the Bacteriological plan, the total germs, the salmonellae, the fecal streptococci and the Escherichia coli have been identified. In addition, the monitoring of the evolution of the parameters analyzed during six weeks of storage revealed a change of the organoleptic quality that appears in the fourth week and a development of Escherichia Coli for the "pure water" exposed in the sun. This study showed, on the one hand, that these "pure water" would be unfit to the human consumption and on the other hand, their storage for a prolonged period and a high temperature affects their qualities.

Les eaux conditionnées en sachet plastique, communément appelées "pure water", ont depuis quelques années, gagné la confiance du public nigérien en raison de leur faible prix, leur disponibilité, la commodité, et de la perception de qualité par les consommateurs. Ce travail étudie l’impact du stockage sur la qualité des "pure water" vendues à Niamey. Ainsi, onze parmi les douze paramètres physico-chimiques analysés ont été suivis pendant six semaines de stockage des "pure water" au soleil et à la température ambiante de laboratoire. A l’issue des résultats obtenus, les paramètres physico-chimiques sont dans les normes hormis la turbidité et le chlore résiduel. Sur le plan bactériologique, les germes totaux, les salmonelles, les streptocoques fécaux et les Escherichia colis ont été identifiés. Par ailleurs, le suivi de l’évolution des paramètres analysés pendant six semaines de stockage a révélé une altération de la qualité organoleptique qui se manifeste à la quatrième semaine et un développement des Escherichia colis pour les "pure water" exposées au soleil. Cette étude a montré, d’une part, que ces "pure water" seraient impropres à la consommation humaine et d’autre part, leur stockage pendant une période prolongée et une température élevée affecte leurs qualités.
Assessing tree effect on total soil carbon in agroforestry parklands systems along a rainfall gradient in Burkina Faso (West Africa)
Authors: Coulibaly Yacouba Noël , Bayala Jules , Gaiser Thomas , Zombre Gérard
Published: March 2021

Trees contribution in improving soil carbon is well established, but few works addressed how this was affected by a climatic gradient. This research investigated effects of Vitellaria paradoxa C. F Gaertn and Parkia biglobosa (Jacq.) Benth on total soil carbon in parklands along a rainfall gradient for recommendations of tree species which better improve soil carbon under specific climatic conditions for parklands adaptation to climate change. Total soil carbon at topsoil and subsoil layers measured using spectrophotometry infrared method, was higher when rainfall increased and were respectively (1.598 ± 0.040; 1.033 ± 0.022; 0.834 ± 0.014; 0.857 ± 0.016%). It was higher at topsoil (0.529 ± 0.015%) and subsoil (0.282 ± 0.019%) under V. paradoxa when rainfall decreased while it was higher under P. biglobosa and V. paradoxa when rainfall increased slightly. Its improvement was higher under V. paradoxa and P. biglobosa when rainfall respectively decreased and increased. A decrease trend of total soil carbon under both tree species from trunk to outside the canopy whatever rainfall levels and soil layers was observed. Tree species choice could play an important role in improving total soil carbon and crop productivity according to rainfall level for parklands adaptation to climate change.
Estimation of trip generation rates for residential land use in Uyo, Nigeria
Authors: Usanga I.N. , Etim R.K. , Umoren V.
Published: March 2021

Change in trip rates affects a transportation system and could lead to the redesign of the transport infrastructure in order to satisfy the new demand. This study estimates trip generation rates for residential land use in Uyo using cross classification method. Five (5) residential estates were considered and household survey carried out to collect trip data from 500 households on purpose and mode of travel through household interview and their response recorded in questionnaire. Four independent variables (household size, household income, car ownership, number of employed persons) were used for the study based on the prevailing conditions of theresidential land use. Cross-classification trip rates were developed from the most significant variables; household size, household income and car ownership. The analysis indicated that work trip produced the highest reported trip rates of 29.6% followed by religious trip of 24.7%. Similarly, private car trips contributed 42.8% of trips made by mode of travel as the highest trip. It was found that household size is the strongest socio-economic variable that influence trip generation in residential land use in Uyo. The cross-classification trip rates developed in this study could provide basis for the estimation of trip generation in residential land use in Uyo.

Keywords: Trip generation; analysis of variance, ANOVA; cross classification
A review on wireless power transfer: Concepts, implementations, challenges, and mitigation scheme
Authors: Sidiku M.B. , Eronu E.M. , Ashigwuike E.C.
Published: March 2021

This paper reviews the current strides in the wireless power transfer (WPT) system. The paper discusses the classification of wireless power transfer, its application, trend and impact on society, advantages as well as disadvantages. It also presents a comparative analysis of existing work done by researchers in the field of wireless power transfer showing the shortcomings in various topologies, communication, and optimization methods used to increase the overall performance efficiency and proffer direction for further studies.

Keywords: wireless power transfer, application, advantages, disadvantages topologies, communication, optimization, efficiency
Effect of locally sourced Nigerian gypsum on the strength and microstructure of Portland cement mortar
Authors: Muhammad A.D. , Amartey Y.D. , Kaura J.M. , Ijimdiya T.S. , Lawan A.
Published: March 2021

The objective of this study was to investigate the suitability of Nigerian, sourced Gypsum for the manufacture of Portland cement. Gypsum samples were obtained from eighteen deposits across Nigeria. These were classified into five purity groups based on their calcium sulphate content.Foreign Gypsum, imported from Morocco, was used as control. Six cement samples where produced for each of the five Gypsum purity groups by grounding and blending cement clinker with 3%, 4%, 5%, 6% and 7% Gypsum content. The group 1 cement mix (having not more than 65% calcium sulphate content) has displayed flash set and could not be moulded and therefore not used for further analysis. Cement mortar prisms were produced for the groups 2, 3, 4 and 5 cement mixes, and subjected to flexural and compressive strength tests at 7, 14, 21 and 28 day curing periods. The cement mortar prisms were also subjected microstructure analysis at 7 and 28 days curing period. The spongy, gel and whitish colouration observed from the  microstructure of the specimens indicated silicates enriched regions which have proven the strength increase from 7 to 28 day curing period. The optimum gypsum content of 5.5% was recommended. The results show that all but the class one gypsum with less than 65% purity content are suitable for cement manufacture.

Keywords: Gypsum, clinker, mortar, microstructure, compressive strength, flexural strength
An assessment of cost escalation in building construction project
Authors: Nazif A. , Mustapha A.K. , Sani F.
Published: March 2021

Estimating of cost for building construction projects with minimum error at the conceptual stage of project development is quite  essential for planning. This study seeks to evaluate factors responsible for cost escalation of building construction projects.  Questionnaires were administered to examine and assess these factors. Subsequently, the mean score value of each factor was determined. In addition, Correlation and Linear regression analyses were used to establish the relationship between these factors. Factors responsible for cost escalation in projects were examined as well as the impact of those factors, and occurrence of those factors on project cost. The result of the analysis showed that, the most agreed factors responsible for project cost escalation were; inadequate supervision, irregular payment, and design error, having high mean values of 4.25, 4.20, and 4.15, respectively. Also, correlation analysis result established that the factors responsible for cost escalation and the impact of cost escalation had significant R and R2 of 0.81 and 0.70 respectively. Addressing these factors would go a long way in reducing the escalation of building project cost. Never the less, an effective cost management strategy is absolutely necessary to safeguard and sustain the construction  industry.

Keywords: cost escalation, building project, construction, regression analysis
Comparison of surficial modification of micro-sized polyethylene
in between by UV/O3 and UVO submerged system
Authors: Zafar Rabia , Park Seon Yeong , Kim Chang Gyun
Published: March 2021

This study examined the effects of ozonation and UV applied in series (O3+UV) or simultaneously (UVO) under four different ozone dosages from 4 to 7 mg/min to understand the surface alterations on polyethylene microplastics in aquatic environments via the photochemical oxidation process. The plastic samples were analyzed by Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and contact angle measurements. FTIR spectroscopy showed that the levels of carbonyl (ketone and esters) and vinyl groups increased gradually with increasing ozone dose injected; the highest was observed at 6 mg/min of ozone. On the other hand, the levels at 7 mg/min of ozone were slightly lower than those at 4 to 6 mg/min. This could be related to the deeper penetration into the crystalline bulk polymeric chain. The contact angle changed from 125.90˚ to the lowest value of 120.04˚ and 123.8˚ for O3+UV and UVO, respectively. Furthermore, XPS showed that C-O was only presented in the 7 mg/min sample, whereas C-O, OH, C=O, and C-C=O remained for 4 to 6 mg/min. Overall, O3+UV can oxidize the surface of the polyethylene microplastic particles more effectively than those of UVO, irrespective of the ozone dosages.
El docente universitario frente al perfil didáctico profesional
Authors: Quijije-Anchundia Pedro Jacinto
Published: March 2021

El presente artículo propone un enfoque que propicia una mirada didáctica profesional a desarrollar en los docentes de carreras universitarias, en la cual se expresa la integración de saberes de distinta naturaleza asociados al campo de la Didáctica de la Educación Superior en el contexto ecuatoriano. Se sustenta en el enfoque de formación profesional basada en competencias en el campo de la Educación Superior. Fue concebida mediante los métodos de análisis, síntesis, revisión de documentos y el enfoque de sistema que permitió configurar la estructura formativa de esta competencia. Puede generalizarse a nivel nacional e internacional con la debida contextualización a las exigencias del proceso formativo de los estudiantes de carreras universitarias.

Palabras claves: competencia, educación superior, docente universitario.
Selección de proveedores, factor de éxito en la gestión de compras del producto restauración
Authors: Álvarez-Ojeda Vladimir , Ramos-Alfonso Yanelis
Published: March 2021

La presente investigación tiene como objetivo, la selección de proveedores para alcanzar una correcta gestión de los procesos de compra en organizaciones gastronómicas, siendo un elemento indispensable mantener proveedores sostenibles y seguros. Los proveedores que coexistan dentro de la gestión empresarial de instalaciones gastronómicas determinarán en gran medida el éxito de ésta. El contar con buenos proveedores no sólo significa contar con recursos de calidad y poder ofrecer productos de calidad, sino también la posibilidad de tener bajos costos, o la seguridad de contar siempre con los mismos productos cada vez que se requieran. Por lo que cada oportunidad que tengamos que elegir a nuestros proveedores, debemos tomarnos nuestro tiempo y evaluar bien las diferentes alternativas que existan ya que es sumamente necesario adquirir bienes y servicios para generar efectos eficientes en su productividad, siendo evidente seleccionar proveedores que mejor se ajusten al cumplimento los estándares de calidad de materias primas, que se utilizan en el proceso de elaboración, y así poder satisfacer necesidades de la organización y del consumidor final, (el cliente). En el estudio se analiza los principales elementos claves que intervienen en la selección de proveedores, las mismas fueron determinadas por método de expertos, detallando aspectos teóricos vinculados a la gestión de compras, se utilizaron métodos teóricos deductivo e inductivo que conllevan análisis y síntesis, de la revisión de los documentos como libros, revistas, y otros tipos de materiales de información científica relacionados a la temática, dándole lógica y coherencia a la presente investigación.

Palabras claves: Selección de proveedores, sostenibles, restauración, recursos, estándares.
A Novel Algorithm for Dynamic Control System of Hysteretic Power of Shock Absorber
Authors: Li Yiqiang
Published: March 2021

Mechanical resonance and high-frequency vibration caused by the external environment will not only affect the performance of vehicles, ships and machinery, but also cause serious harm to human health. In order to pursue higher ride comfort and reduce the adverse effects on the operator when operating the equipment, the shock absorbers are widely used in aircraft, vehicles and other vehicles or precision machinery. The automatic control of the hysteresis power system of the shock absorber is one of the key tasks in the design and application of the shock absorber. With the development and maturity of mechanical automation technology, PLC control technology has been applied in shock absorbers, but PLC control technology is difficult to achieve the requirements of hysteretic control of shock absorbers in the system precision control. Therefore, a novel algorithm for dynamic control system of hysteretic power of shock absorber is presented. The simulation results show that the control system can effectively improve the control accuracy, and the hysteresis output power of the system is closer to the ideal value.
A Filtering Algorithm of Main Word Frequency for Online Commodity Subject Classification in E-Commerce
Authors: Wei Zhenfeng , Zhang Xiaohua
Published: March 2021

—Based on the traditional classification of plain text in E-Commerce, this article has put forward a processing method in accordance with semi-structured data and main information in web pages, which enhances the accuracy of the product distribution. On the basis of the traditional textmining, combined with the structure and links of web page, this article has proposed an improved web page text representation model in E-Commerce based on supporting vector machines and web text classification algorithm, but there are still a lot of shortcomings waiting for further improvement. According to the data contrast in precision ratio, recall ratio and F-measure, the effect of the improved experiment with LDF-IDF is comprehensively better than that of tf-idf. The precision rate in certain classification can reach 100%, but there is low precision rate caused by items with fewer samples or samples fuzziness. Therefore, the classification of the correct category will directly affect the effect of classification.
A Novel Algorithm for Path Planning of the Mobile Robot in Obstacle Environment
Authors: Yang Chun-li
Published: March 2021

—In this paper, a design method of smoothing the path generated by a novel algorithm is proposed, which makes the mobile robot can more rapidly and smoothly follow the path and reach the target point. No matter the attitude vector angle is an acute angle or obtuse angle, there is no doubt that we can find the right curve, including polar polynomial curves and piecewise polynomial functions, which makes the path length and the circular arc tend to be similar and guarantees the shorter path length. In the condition of meeting the dynamic characteristics of the mobile robot, the tracking speed and quality are improved. Therefore, the symmetric polynomial curve and the piecewise polynomial function curve are used to generate a smooth path. This novel algorithm improves the path tracking accuracy and the flexibility of the mobile robot. At the same time, it expands the application range of mobile robot in structured environment.
Scientific diplomacy: tasks and opportunities
Authors: Cheberkus Dmytro
Published: March 2021

The author emphasizes the features of scientific diplomacy and describes the challenges facing Ukraine's scientific diplomacy in the context of European integration. The article deals with the formulation in Ukraine of a new kind of diplomacy - science diplomacy. Science has international and universal nature. That is why, has the ability to improve the communication between peoples, communities, and societies. Science itself is a tool of achievement of foreign policy objectives. So, on the one hand we can use a science as a process and way of communicating. On another hand, science diplomacy could be an instrument promoting peace and sustainable development. Today, the science and research cooperation used fragmentary in Ukraine foreign strategy, but taking into account the experience of EU and US and understanding the importance of science itself, science diplomacy has to be one of the key component of Ukrainian foreign policy. The author also defines the essence of science diplomacy as a means of implementing the foreign policy of the state, using of non-military practical measures, techniques and methods. The science diplomacy applied taking into account the specific conditions and nature of the tasks facing upon state. In addition, the author describes the main challenges facing contemporary Ukrainian diplomacy. Thus, the current tendencies of the development of science in the world make it necessary to reconsider the role of science in state policy in various spheres. The author concludes that the science diplomacy of Ukraine is realized in close cooperation with the main foreign policy priorities of the state. Also, contemporary science diplomacy could use the instruments of traditional diplomacy. At the same time, the importance of science diplomacy has grown significantly since the decision to coordinate its steps with EU policy in the scientific field.
Observations on the survival capacity of 118 plant taxa on a green roof in a semi-arid climate: 12 year update
Authors:   Denver Botanic Gardens, Schneider Amy , Landis Michelle ,   Colorado State University, Bousselot Jennifer ,   Colorado State University
Published: March 2021

The Green Roof at Denver Botanic Gardens was built in the fall of 2007. Since installation, data on the green roof have been collected on 118 plant taxa 43 of which have survived for over 10 years. Plants were grouped based on their metabolic and growth type: succulents, creeping forbs, upright forbs, graminoid, and shrubs. Overall, shrubs and succulents have displayed the highest survival rates, showing the greatest potential for use on green roofs in semi-arid conditions. Graminoids survived about half the time and creeping and upright forbs had the lowest overall survival in semi-arid Colorado. Species survivability rates were calculated based on the number of plants of that species originally installed on the green roof.
The Archaeology of Cult of Ancient Israel’s Southern Neighbors and the Midianite-Kenite Hypothesis
Authors: Tebes Juan Manuel
Published: March 2021

The Midianite-Kenite hypothesis, the idea that the pre-Israelite roots of Yahwism can be traced back to the areas south and southeast of Palestine, has a long pedigree in biblical scholarship. Analyses supporting this view generally agree in three main points. First, they assume that the influence of the southern cultic practices on Yahwism occurred during a restricted period of time, traditionally dated to the Early Iron Age. Second, they see the origins of Yahwism through the lenses of diffusionist perspectives, characterizing this process as a movement or migration of one or a few determined groups to Canaan. And third, adequate analyses of the archaeological evidence of the arid areas to the south of Palestine are few. In this article I will turn the interpretation of the epigraphic and archaeological evidence upside down. Instead of looking to the (mostly biblical) evidence on the origins of the cult of Yahweh and assuming its genesis lies in movements of people from the southern regions to Canaan in the Early Iron Age, I will focus attention on the history of the cultic practices in the Negev, southern Transjordan, and northern Hejaz during the entire Iron Age, and how this information is related to the religious practices known in Judah and Israel during the biblical period, shedding new light on the prehistory of the cult of Yahweh. I will evaluate the evidence not as a single, exceptional event, but as a long-term process within the several-millennia history of cultic practices and beliefs of the local peoples.
Atom: A Stream Cipher with Double Key Filter
Authors: Banik Subhadeep , Caforio Andrea , Isobe Takanori , Liu Fukang , Meier Willi , Sakamoto Kosei , Sarkar Santanu
Published: March 2021

It has been common knowledge that for a stream cipher to be secure against generic TMD tradeoff attacks, the size of its internal state in bits needs to be at least twice the size of the length of its secret key. In FSE 2015, Armknecht and Mikhalev however proposed the stream cipher Sprout with a Grain-like architecture, whose internal state was equal in size with its secret key and yet resistant against TMD attacks. Although Sprout had other weaknesses, it germinated a sequence of stream cipher designs like Lizard and Plantlet with short internal states. Both these designs have had cryptanalytic results reported against them. In this paper, we propose the stream cipher Atom that has an internal state of 159 bits and offers a security of 128 bits. Atom uses two key filters simultaneously to thwart certain cryptanalytic attacks that have been recently reported against keystream generators. In addition, we found that our design is one of the smallest stream ciphers that offers this security level, and we prove in this paper that Atom resists all the attacks that have been proposed against stream ciphers so far in literature. On the face of it, Atom also builds on the basic structure of the Grain family of stream ciphers. However, we try to prove that by including the additional key filter in the architecture of Atom we can make it immune to all cryptanalytic advances proposed against stream ciphers in recent cryptographic literature.
Badiou en Argentina. Acontecimiento y las vicisitudes de una recepción temprana y política
Authors: Starcenbaum Marcelo
Published: March 2021

El objetivo de este trabajo es demostrar que la recepción de Alain Badiou en Argentina tuvo un carácter temprano y político. Para ello, analizaremos la revista Acontecimiento, que durante veinticinco años llevó a cabo una lectura de la realidad argentina y latinoamericana a través de tesis y conceptos provenientes de la obra del filósofo francés. En la primera mitad de la década de 1990 la revista procesará el derrumbe del socialismo real y la imposición de una gramática política democrática. En la segunda mitad de la década de 1990, diferentes experiencias políticas serán caracterizadas como una nueva secuencia política desplegada a distancia de los partidos y el Estado.
El sindicalismo de base en el gobierno de Macri: lucha y resistencia en las industrias de la zona norte del conurbano bonaerense
Authors: Arecco Maximiliano
Published: March 2021

En este artículo se describe y analiza, desde la mirada de delegados gremiales de fábricas con prácticas del sindicalismo de base (PepsiCo, Praxair y Frigorífico Rioplatense) de la zona norte del conurbano bonaerense, el impacto en las relaciones laborales que tuvo la llegada al gobierno de Mauricio Macri y la alianza Cambiemos, las políticas desarrolladas por las patronales y las respuestas de las y los trabajadores organizados en esos lugares de trabajo.
Analysis of Marital Expectations in African Immigrant and United States-Born Married Couples
Authors: Ngazimbi Evadne , Daire Andrew , Carlson Ryan , Munyon Matthew
Published: March 2021

The current phenomenological qualitative study aimed to understand marital expectations in married African immigrants and United States-born (U.S.-born) married couples. Eighty-five African-born immigrant and U.S.-born couples from a predominately Seventh-day Adventist sample residing in the U.S. completed the Marital Expectations Questionnaire (MEQ). We analyzed data collected in response to the first question. Data analysis revealed 12 codes associated with four themes related to marital expectations: (a) Care and Support; (b) Love and affection (c) Commitment and (d) Shared Values. We present implications for marital relationships and future research.
Pathways to Self-Injury: A Qualitative Exploration of Social Psychological Processes
Authors: Wojciechowski Thomas
Published: March 2021

Self-injury is a deviant behavior often understood as the intentional infliction of harm onto one’s own body that exists absent of suicidal. This study uses a qualitative methodology to examine the etiology and perpetuation of self-injury using the terminology of relevant social-psychological theories to determine which processes best describe a causal pathway leading to self-injury and its perpetuation after the onset of the behavior. Data obtained from 16 semi-structured interviews with former and current self-injurers indicate that the processes described in general strain theory, social learning theory, and social control theory are all important for understanding the etiology and perpetuation of self-injury. Analytic induction was utilized as the method of analysis in order to parse out only the elements universal to pathways to self-injury evident in all of the examined cases. All participants used self-injury as coping response for mitigating negative affect stemming from strain, thus, implicating general strain theory as important for understanding the onset of self-injury. Participants were categorized into two subtypes of self-injurers based upon the temporal dimension of the social learning process. Future research should attempt to use quantitative methodologies to provide generalizability for the results of this study and examine how changes in risk and protective factors over the life-course modify one’s propensity to engage in self-injury.
Antecedents of New Venture Creation Decision in Iranian High-Tech Industries: Conceptualizing by a Non-Teleological Approach
Authors: Zivdar Mehdi , Imanipour Narges
Published: March 2021

Entrepreneurs’ decision-making process is one of the main research topics in entrepreneurship studies. This research aims to conceptualize the antecedents of new venture creation decision in Iranian high tech industries. The research utilizes an innovative non-teleological approach in order to take into account the specific regional context of Iran. Most research into entrepreneurial decision making utilizes teleological approaches; however, these models could not adequately explain the phenomena within the Iranian context. This qualitative study utilized event- based interviews with 20 nascent entrepreneurs. Results from coding, categorizing and validating the research findings, revealed 3 main categories as antecedents of new venture creation decision. Accordingly, concepts of entrepreneurial meta-cognition; primary actions and receiving feedback; and positive attitude toward change, constitute the main antecedents of new venture creation decision in this context. The findings also reveal the non-teleological nature of entrepreneurial decision-making, and adoption of some effectuation logics in the studied decision-making process.
School Principals’ Views on Administration Work, Their “Frequent Turnover” and Its Effects on Their Work
Authors: Balyer Aydin
Published: March 2021

School administrators’ “frequent turnover” has been discussed intensively in the Turkish Educational System recently. Currently, principals are selected for 4 years after an interview conducted by a committee of directors of national education. After that period, they either go back to their classes or are chosen for another 4 years for the last time. This frequent turnover can be disruptive for schools. This study was conducted to determine school principals’ views on administration work and this frequent turnover. The study employed a qualitative research design. The participants were 20 principals chosen with maximum sampling method. The data were analyzed with content analysis method. Results revealed that most principals consider administration work as a professional and career profession which requires expertise, leadership qualities and education in educational administration. They also evaluate the selection system as problematic and limiting their work period with 4 years prevents them from realizing long-term projects. Finally, they think that the system works with political considerations clearly.
Leadership in an Australian Context: Highlighting a Qualitative Investigation with Construct Validity Support
Authors: Faris Nezar
Published: March 2021

This paper highlights how criteria for validity that are usually utilized within quantitative research can be used to provide further validation to fully qualitative research. In this case, the qualitative research utilizes the grounded theory method. This research used the grounded theory to investigate leadership processes in the substantive setting of the Islamic organizations in Australia. The qualitative analysis of qualitative data generated a number of categories that were conceptually unique. Theoretical sampling directed the researcher toward data sources that provided further conceptual uniqueness. The similarity between some of these newly-generated categories and lower-order categories gave cause to claim convergent validity for the findings. Also, the contrast between other newly-generated categories and some lower-order categories gave cause to celebrate discriminant validity. The significant contribution in this paper is bringing convergent validity and discriminant validity to grounded theory research.
PSYCHOLOGICAL VULNERABILITIES OF INTERNALLY DISPLACED PERSONS IN PAKISTAN AND ITS EFFECTS ON GENERAL COMMUNITY
Authors: Aleemi Abdur Rahman
Published: March 2021

Purpose: The purpose of this study is to assess the effects of psychological problems faced by IDPs (displaced as a result of Operation Zarb-i-Azb) of North Waziristan on local Community. IDPs coming from Waziristan and surroundings including men and women of all ages and children are the ones who are more vulnerable to physical and mental stresses likely to be caused by military actions of terrorists and counteraction by Pakistani Armed Forces. They have residence in shelter homes, tents are in a community which is different and most of the time hostile from their own community. The stresses like violence, migration, imposed poverty unhygienic and unsystematic living atmosphere of camps lead the IDPs to a change in everyday life activities away from their own cultural routines which in turn is causing deterioration of society as well. Methodology/Sampling: This is primarily an exploratory study done on the field in IDP camps situated in Bannu district. We approached a sample of 500 IDPs and identified around 200 to be suffering from psychological issues, who were interviewed and were administered with questionnaires with the help of trained surveyors and medical team. Findings: It is noted that such transitory unplanned no systemic living has caused an increase in activities like thieving, use of drugs, abduction for ransom, and other forms of violence and such like activities. The relationship between psychological issues of IDPs and the effects on community (Proxied by Crime rate) were subjected to descriptive analysis and were found that significantly good number of IDPs suffers from psychiatric disorders and there is a significant increase in crime rate for areas with sufficient number of IDPs around. Practical Implications: Displacement results in emergence of particular vulnerabilities for those affected, and also for the surrounding communities, thereafter necessitating specific measures for the provision of assistance and further protection corresponding to vulnerabilities.