bluuebunny/crossref_metadata_2025 huggingface dataset:
Development of a petroleum pipeline monitoring system for characterization of damages using a Fourier transform
Authors: Aba E.N. , Olugboji O.A. , Nasir A. , Olutoye M.A. , Adedipe O.
Published: September 2020

Significant damage to the environment and huge economic losses are potential problems caused by leakage from petroleum pipelines. The occurrence of a leakage in a pipeline throughout its lifetime is very difficult to prevent. To minimize environmental damage and high economic losses, an efficient pipeline monitoring system is required to carry out damage characterization thereby enhancing quick response. The signal processing technique of sampling and reconstruction was adopted and mathematical algorithms for the characterization of damages in pipes were developed using the Fourier transform method. These were simulated with the results showing a good agreement between the shapes and magnitudes of the measured original and reconstructed pulses. The simulation was verified with experiments on the test rig. The results showed an underestimation in the magnitudes of the reconstructed pulses in the range of 40 – 45 %. This problem was solved by using a factor K obtained by dividing the maximum amplitude value of the original pressure pulse by that of the reconstructed pulse. Reconstruction of the measured original pulse at a damage location was achieved from combining the measured pulses from two other close locations using the developed Fourier transform based model.

Keywords: Damage Pipeline-monitoring Characterization Fourier transform Reconstruction
A comparative analysis of selected clustering algorithms for criminal profiling
Authors: Adeyiga J.A. , Olabiyisi S.O. , Omidiora E.O.
Published: September 2020

Several criminal profiling systems have been developed to assist the Law Enforcement Agencies in solving crimes but the techniques employed in most of the systems lack the ability to cluster criminal based on their behavioral characteristics. This paper reviewed different clustering techniques used in criminal profiling and then selects one fuzzy clustering algorithm (Expectation Maximization) and two hard clustering algorithm (K-means and Hierarchical). The selected algorithms were then developed and tested on real life data to produce "profiles" of criminal activity and behavior of criminals. The algorithms were implemented using WEKA software package. The performance of the algorithms was evaluated using cluster accuracy and time complexity. The results show that Expectation Maximization algorithm gave a 90.5% clusters accuracy in 8.5s, while K-Means had 62.6% in 0.09s and Hierarchical with 51.9% in 0.11s. In conclusion, soft clustering algorithm performs better than hard clustering algorithm in analyzing criminal data.

Keywords: Clustering Algorithm, Profiling, Crime, Membership value
Controllable single-phase smart synchronous generator towards solar-pneumatic power generation
Authors: Akinloye B.O. , Uzedhe G.O.
Published: September 2020

This paper presents the development of a controllable single-phase surface-mounted permanent magnet synchronous generator (SPSMPMSG) for low speed applications. Presently, the world is faced with degrading climatic conditions that may be worsen if energy need is met by fossil fuel and other conventional means of generation. On the other hand, renewable alternatives are not always of constant speed, and are usually not high enough to turn conventional alternators. There is therefore a need for the development of alternators that can generate electricity from low speed  sources. The development of permanent magnet from rare-earth materials has revolutionized the electrical generator development. Permanent magnet machines are characterized by high torque, low noise, high efficiency and high power factor. The use of these magnets also made it  possible to add computer based controllability making the generator a smart machine. This paper presents a CAD design of smart generator at an input speed of 500rpm to a turbine to produce a constant output of 220V. Simulation and physical test results produce an output of 220V ± 1% and give a clear indication that low speed renewable energy sources can produce usable electrical power.

Keywords: Smart generator, Permanent magnet generator, stator, rotor, Computer-aided design.
Exploring multinomial naïve Bayes for Yorùbá text document classification
Authors: Ayogu I.I.
Published: September 2020

The recent increase in the emergence of Nigerian language text online motivates this paper in which the problem of classifying text documents written in Yorùbá language into one of a few pre-designated classes is considered. Text document classification/categorization research is well established for English language and many other languages; this is not so for Nigerian languages. This paper evaluated the performance of a multinomial Naive Bayes model learned on a research dataset consisting of 100 samples of text each from business, sporting, entertainment, technology and political domains, separately on unigram, bigram and trigram features obtained using the bag of words representation approach. Results show that the performance of the model over unigram and bigram features is comparable but significantly better than a model learned on trigram features. The results generally indicate a possibility for the practical application of NB algorithm to the classification of text documents written in Yorùbá language.

Keywords: Supervised learning, text classification, Yorùbá language, text mining, BoW Representation
Determination of the failure mechanism of stand alone solar street light
Authors: Anoliefo E. , Oparaku O.U. , Egoigwe S. , Olisa S.
Published: September 2020

Despite the acclaimed long-term benefits of solar PV systems, most stand-alone solar projects in Nigeria seem to fail within a short duration. In this work, an analysis is carried out to examine the factors that lead to such poor performance of solar projects in Nigeria. A case study of standalone solar street lights (SASSL) in Nsukka geographical region in Nigeria was explored. The field work was carried out from Dec 2016 - January 2018. Data from field indicate that in most cases, premature battery failure due to undercharging was responsible for the collapse of these stand-alone solar systems. Given that the PV module is the sole charge generator in SASSL, the energy yield of the PV modules used in the SASSLs were further investigated. Controlled experiments were carried out to determine the impact of specific environmental and installations conditions on the yield of the PV modules. The results of the experiments led to the development of a model. The weather and installation specific data were then inserted into the model and were used to determine the likely reasons for the premature failure of SASSLs. The results indicated that the within the period under review, the PV modules were capable of providing adequate energy to the battery for only 25% of the time. For another 25% of the time the energy provided were marginal while for 50% of the time the energy provided were grossly inadequate.

Keywords: Failure, Battery, Dust, Solar, mechanism, Street light, Irradiance, PV Module.
Yield, water use and water productivity of drip-irrigated cucumber in response to irrigation depths and intervals in Kaduna, Nigeria
Authors: Zakka E.J. , Onwuegbunam N.E. , Dare A. , Onwuegbunam D.O. , Emeghara U.U.
Published: September 2020

A study was carried out at the research farm of the Federal College of Forestry Mechanization, Afaka, Kaduna, Nigeria, to determine the effect of irrigation depths and intervals on the yield, crop water use and water productivity of drip-irrigated cucumber (market-more variety) in two irrigation seasons (2016/17 and 2017/18). Irrigation was scheduled using the reference evaporation data obtained from pan evaporation measurements taken within the experimental periods. The results showed a significant difference in both seasonal crop evapotranspiration and yield at 5% level of significance in both seasons. The highest yields (21 t/ha and 20.3 t/ha) were obtained from the treatments with 100 ETo, irrigated daily (T1), while the lowest (15.5 t/ha and 16.5 t/ha) were obtained from the treatments with 60% ETo, irrigated every four days (T9). The highest water productivities were obtained from the treatments with 60% ETo, irrigated daily (T7), while the lowest were obtained from the treatments with 100% ETo, irrigated every four days (T3), implying a better yield effect due to light high frequent irrigation than deep low frequent irrigation. The marginal difference in yield due to the marginal difference in water applied in T1 and T7 is 3.7 t/ha. It is concluded that full irrigation produced higher yield than deficit irrigation but with lower crop water productivity.

Keywords: Cucumber yield, water use, water productivity, irrigation depth, irrigation interval
Improving the capacity and operational efficiency of an on-street parking system using data-based parking management strategies: case study of watt market in Calabar, South-South Nigeria
Authors: Ukam G.S.
Published: September 2020

Solving parking challenges in a manner that is sustainable would require a shift from using up more scarce land resources in providing supply to meet an unending demand for parking. Parking management is the approach of tackling parking challenges that efficiently utilizes scarce resources to meet demand in a sustainable way. This paper studied an on-street parking system in the central business district with the aim of proffering  policies and strategies that can help improve the capacity and operational efficiency of the park. Parking inventory and the license plate method were employed in analyzing the parking characteristics of the park. By introducing a parking duration restriction, more capacity could be  accommodated on the current available lots. A 90-minute limit would accommodate at least 106 more vehicles and increase the turnover from 13 to 14 vehicles per lot for the duration of survey, thus improving operational capacity and efficiency. The paper shows that parking management  strategies that are effective in making the difference should be employed based on adequate field surveys, observations and analysis.

Keywords: On street parking, parking capacity, parking management, Parking survey, License plate
Performance of metakaolin based geopolymer concrete at elevated temperature
Authors: Gambo S. , Ibrahim K. , Aliyu A. , Ibrahim A.G. , Abdulsalam H.
Published: September 2020

Due to the carbon dioxide emission arising from the production of cement, alternative concrete that is environmentally friendly such as metakaolin geopolymer concrete have been developed. However, the performance of metakaolin based geopolymer concrete (MKGC) when exposed to aggressive environment particularly elevated temperature has not been investigated. Therefore, this paper assessed the performance of MKGC exposed to elevated temperatures. MKGC cube specimens of grade 25 were produced using a mix ratio of 1:1.58:3.71.After preparing the specimens, they were placed in an electric oven at a temperature of 60oC for 24 hours. Thereafter, the specimens were stored in the laboratory at ambient temperature for 28 days. The specimens were then exposed to elevated temperatures of 200, 400, 600 and 800oC. After exposure to elevated temperatures, the MKGC specimens were subjected to compressive strength, water absorption and abrasion resistance tests. Results show that at 600 and 800oC, the MKGC lost a compressive strength of 59.69% and 71.71% respectively. Higher water absorption and lower abrasion resistance were also observed.

Keywords: Cement, Compressive Strength, Metakaolin Concrete, Elevated Temperature.
Engine performance of blends of palm kernel oil biodiesel under varying speed at constant torque
Authors: Nwakaire J.N. , Obi O.F. , Ohagwu C.J. , Anyadike C.C. , Ugwu I.E. , Ifoh J.U.
Published: September 2020

This study conducts a comparative evaluation the effect of using palm kernel oil (PKO), pure petroleum diesel and their blends (B5, B10, B20, B30, B40, and B100), on the performance of a four-cylinder CI diesel engine (David Brown 990: 58hp; 2WD), at Farm Power and Machinery Test laboratory Centre (FPMTLC), Department of Agricultural and Bioresources Engineering, University of Nigeria, Nsukka. The objective of the study was to determine the fuel consumption rates, energy expended, brake specific fuel consumption, and brake thermal efficiency, under varying operating speeds (700 – 1900rpm) at constant torque. Each fuel test was conducted using the Heenan-Froude hydraulic dynamometer engine-test-bed; pure petroleum diesel (B0) was used to generate the baseline data. Variables calculated were analyzed, then compared with each other to determine the differences in the engine performance and also to determine the optimum test fuel. The results obtained show that B10 had the overall optimum energy output, fuel consumption rates, and brake specific fuel consumption of 5431.809J, 3.42E-07 m3/s, and 0.16569l/KWh, respectively at the highest engine speed of 1900. B10 had an excellent brake thermal efficiency of 60.6% but was not better than B100, which showed a higher value of 66.95%. From the analysis, B10 is the optimum test fuel and can be used as an alternative fuel in David Brown 990 (58hp; 2WD) or similar CI diesel engines without any engine modification, even though B100 showed potential as an alternative to fossil diesel. Biofuel production grows through integrated aquaculture and algae production; the algae oil will serve as a raw material for biofuel production

Keywords: Blends, Biodiesel, Brake Specific Consumption, Diesel Engine, Fuel Consumption rate, Thermal Efficiency.
COP enhancement of vapour compression refrigeration system using dedicated mechanical subcooling cycle
Authors: Mogaji T.S. , Awolala A. , Ayodeji O.Z. , Mogaji P.B. , Philip D.E.
Published: September 2020

This study focused on development of an improved vapour compression refrigeration system (IVCR system). Dedicated mechanical subcooling cycle is employed in attaining the developed IVCR system. The system is composed of two cycles cascade refrigeration system working with R134a. It consists of a rectangular shape with total storage space of 0.582 m3, made of galvanized mild steel and internally insulated with 0.05 m polystyrene foam. Tests under a wide range operating temperature conditions were carried out on the developed IVCR system. Performance evaluation of the system was characterized in terms of cooling capacity and coefficient of performance (COP). Experimental results showed that the COP of the subcooled system improved better than that of the main system from 18.0% to about 33.5% over an evaporating temperature range of -10 to 30oC. It can be concluded that the use of dedicated sub cooling cycle in VCR system is more efficient and suitable for the betterment of thermal system performance.

Keywords: Vapour compression Refrigeration system, Coefficient of performance, dedicated subcooled system, Condensation temperature, Evaporation temperature.
Influence of temperature difference (water-cover surface) on the performance of a compact hemispherical solar still
Authors: Adewole B.Z. , Arabambi A.E. , Asere A.A.
Published: September 2020

The study investigated the influence of temperature difference (ΔT) between evaporative and condensing surface temperature on water productivity of hemispherical solar still. The still was developed, tested and evaluated under the climatic conditions of Ile-Ife, Nigeria, to obtain an average distillate yield per hour per day for different combination of basin temperature, water temperature, transparent cover temperature, ambient temperature and solar intensity. Results indicated a decrease in the hourly water yield as (ΔT) increases. Regression analysis revealed that ΔT has no significant influence on the hourly water yield (P > 0.05). Maximum water productivity was obtained for a low condensing surface temperature and a high evaporative surface temperature. The study concluded that the improvement on water productivity of solar still can be achieved by enhancing the evaporative and condensing surface temperature. Methods for obtaining higher evaporating temperature should be sought in order to boost water productivity of solar stills.

Keywords: Temperature difference, Evaporative surface, Condensing surface, Hourly water yield, Heat losses.
Analysis and implementation of a solar tracking rack system
Authors: Okandeji A.A. , Olajide M.B. , Olasunkanmi G.O. , Jagun Z.O.
Published: September 2020

Solar energy is the most feasible source of renewable energy especially in sun rich regions like Africa. In particular, electrically epileptic country like Nigeria with current power output of only about 3.5GW of energy has a relatively long sunny period for about 90% of the year, making Nigeria very rich in solar power. Maximally harnessing solar energy into usable electricity however, is still a fundamental problem as the existing models can harness only about 70% of the available energy. To maximally harness solar energy, a solar panel must be perpendicular to the energy source for all 12hours of sunlight availability, and must be able to follow the sun’s movement all day long. Accordingly, this work considers the analysis, construction, and implementation of a single axis solar tracking dynamic system. Experimental result show that the proposed system outperforms the conventional static solar tracking system.

Keywords: solar energy, single axis, harvesting-solar energy.
Application of 2-dimensional tomography to investigate subsurface lithology in Auchi polytechnic, auchi, Edo state, nigeria
Authors: Aigbogun C.O. , Babaiwa D.A. , Mujakperuo B.J.O.
Published: September 2020

The Wenner – Schlumberger array was used for Constant Separation Traversing (CST) to investigate subsurface lithology in Auchi Polytechnic, Auchi. All the traverses were carried out with electrode spacing of 5 m with a spread of 200 m. The data was obtained using Pasi terrameter (16-GL) and processed with the Dipro software. The subsurface resistivity values ranged from 207 Ωm – 8357 Ωm. The results obtained from this survey classified the subsurface lithology into topsoil, clayey sand, sandy clay and sand. The maximum depth penetrated was 50 m.

Keywords: Lithology, resistivity, subsurface, Wenner-Schlumberger, 2-Dimensional.
Effects of microwave power and slice thickness on fiber and ash contents of dried sweet potato (Ipomoea batata)
Authors: Nwajinka C.O. , Okonjo E.O. , Amaefule D.O. , Okpala D.C.
Published: September 2020

Investigation of microwave drying of sweet potato slices was conducted at microwave oven power settings of 90, 100, 120 Watts and slice thicknesses of 3mm, 4mm and 6mm using Fourier models and response surface methods. The slice samples dried from initial moisture content of 70.71𝒈𝒘𝒂𝒕𝒆𝒓/𝒈𝒅𝒓𝒚 𝒎𝒂𝒕𝒕𝒆𝒓 to 12.7𝒈𝒘𝒂𝒕𝒆𝒓/𝒈𝒅𝒓𝒚 𝒎𝒂𝒕𝒕𝒆𝒓 final (equilibrium) moisture content in the microwave oven. Fourier models adequately fitted the drying data with the following values of the fit parameters: MBE= 0.00002943 to 0.000645, R² = 0.9987 to 1, RMSE = 0.00384 to 0.01692. Effective moisture diffusion coefficient (𝑫𝒆) of the samples ranged from 𝟏.𝟎𝟖𝟐𝟐 × 𝟏𝟎−𝟑m2/s to 𝟖.𝟑𝟖𝟏𝟐 × 𝟏𝟎−𝟑 m2/s. Analysis of Variance (ANOVA) was used to analyze the effect of drying conditions on the samples parameters at 95% ( p<0.05). The results showed that slice thickness and microwave power have significant effects on the ash and fiber contents of the dried potato samples. At the microwave power of 90 W and slice thickness of 4 mm the values of Fiber and Ash retained in the dried sweet potato samples were optimal at 4.30% and 2.50% respectively, after drying for 390 minutes to an average moisture content of 14.2 gH2O/gdm. Optimized equations for predicting the percent ash and fiber contents at combined factors of microwave power and slice thickness were developed using Response Surface Methodology (RSM) at 95% confidence bound. The coefficients of determination (R2) for the models are 0.7333 and 0.9655 for fiber and ash respectively. These are indications that the models can be used to predict the two food components of microwave dried potato slices.

Keywords: RSM, Fourier Model, Microwave, Sweet Potato, Ash, Fiber
Rare earth elements and stable sulphur (δ34s) isotope of baryte mineralization in Liji Area, Northern Benue trough, northeastern Nigeria
Authors: Kamale H.I. , El-Nafaty J.M. , Umaru A.O. , Shettima B. , Obidiegwu M.U.
Published: September 2020

The Liji area lithologically consists of inliers of granite and pegmatite members of the Pan-African granitoids surrounded by Cretaceous sedimentary deposits of Bima, Yolde, Pindiga and Gombe Formations. Epigenetic fracture-filling baryte mineralization hosted by granite, pegmatite and Bima Sandstone were delineated, sampled and analyzed for rare-earth elements (REEs) and stable sulphur isotope geochemistry. The REEs of the distal (unaltered) rocks indicated normal values (26.15-36.81 ppm) before mineralization was marked by enrichment of light rare-earth elements (LREEs) (27.94 ppm) relative to the heavy rare-earth elements (HREEs) (5.34 ppm) and negative Eu anomalies typical of calc-alkaline granites of Pan-African age. The baryte separates were marked by enriched LREEs and depleted HREEs with pronounced positive Eu anomalies indicating the invasion and consequent deposition of baryte-rich hydrothermal fluid under oxidizing conditions in the N-S and E-W striking fractures. Stable sulphur isotope of the baryte gives values that ranged from 18.3 - 19.8o/oo CDT indicating that the source of sulphur is from ocean water and not from magmatic, fresh water and connate water sources from the nearby granite, pegmatite and sandstone.

Keywords: Baryte, Mineralization, Hydrothermal, Liji, REE, Sulphur-Isotope.
Mardin İli ve Civarında Yabani Nohut (Cicer reticulatum) Gen Kaynaklarının Belirlenmesi, Toplanması ve Karakterizasyonu
Authors: Cemal EROL  , Mustafa OKANT
Published: September 2020

Bu araştırmanın amacı; Mardin ili ve civarında yabani nohut (C.reticulatum) genotiplerinin bitkisel ve tarımsal özelliklerini belirlemektir. Deneme; 2015-2016 üretim seozununda Harran Üniversitesi Ziraat Fakültesi Osmanbey Yerleşkesi Tarımsal ve Uygulama Alanında yürütülmüştür. Araştırma, tesadüf blokları deneme desininde 3 tekrarlamalı olarak kurulmuş, 64 yabani nohut genotipi, 4 tescilli genotip ve 1 yerel genotip olmak üzere toplam 69 genotip değerlendirilmiştir. Araştırma sonuçlarına göre; İlk çiçeklenme süresi 123.33-138.00 gün, ilk bakla bağlama süresi 134.00-148.00 gün, bitki taç genişliği 1126.00-2950.28 cm2, olgunlaşma gün sayısı 176.00-210.33 gün, hasat indeksi %4.68-50.53, biyolojik verim 61.00-253.67 g/parsel, parsel verimi 20.93-108.05 g, 100 tane ağırlığı 10.45-44.61 g, tane boyu 6.55-10.85 mm, tane eni 4.52-8.62 mm ve tane genişliği 4.17-8.34 mm arasında değişim göstermiştir.
Ihlamur Ağacı Tilia rubra subsp. caucasica (Rupr.) V. Engl. Yapraklarının Yem Değeri Potansiyelinin Belirlenmesi
Authors: Mehmet Arif ÖZYAZICI  , Semih AÇIKBAŞ
Published: September 2020

Bu çalışma, Türkiye’nin Doğu Karadeniz Bölgesi’nin kıyı kesiminde yetişen ıhlamur ağacı [Tilia rubra subsp. caucasica (Rupr.) V. Engl.] yapraklarının yem değeri potansiyelinin belirlenmesi amacıyla yürütülmüştür. Bu amaçla, Temmuz ayının başında bitkinin tam çiçeklenme döneminde 35 farklı ıhlamur ağacından yaprak örnekleri alınmıştır. Yaprak örneklerinde; ham protein (HP), asit deterjanda çözünmeyen lif (ADF), nötral deterjanda çözünmeyen lif (NDF), toplam fosfor (P), potasyum (K), kalsiyum (Ca) ve magnezyum (Mg) analizleri yapılmış, yaprağın Ca/P ve K/(Ca+Mg) oranları saptanmıştır. Araştırma sonucuna göre, ıhlamur ağacı yapraklarının HP, ADF, NDF, P, K, Ca ve Mg içerikleri sırasıyla; % 13.52-23.82, % 21.25-35.73, % 31.58-57.03, % 0.23-0.80, % 0.04-1.75, % 1.80-2.97 ve % 0.21-0.71 arasında değişkenlik göstermiştir. Çalışmada, ıhlamur yaprağının K/(Ca+Mg) oranı 2.2’den düşük çıkmış; Ca/P oranı ise hayvan sağlığı açısından riskli bulunmuştur. Ham protein bakımından zengin olan ıhlamur ağacı yapraklarının kaba yem olarak kullanılması durumunda, yem rasyonlarına P ve K kaynakları eklenmelidir.
Determination of Macronutrient Contents of Dry Grass of Some Vetch Species in Different Mixing Ratios with Barley
Authors: Nizamettin TURAN  , Seyithan SEYDOŞOĞLU  , Uğur SEVİLMİŞ  , C. Aylin OLUK
Published: September 2020

This research was carried out to determine the macronutrient content in dry grass of barley, which is mixed with common vetch and hairy vetch in different proportions. Field trials were conducted at Siirt University (Turkey) for two years in the winter season of 2017-18 and 2018-19. Common vetch (YF), hairy vetch (TF) and barley (A) plants were grown sole, and each vetch species was grown mixed with barley in four different mixing ratios (80:20, 60:40, 40:60, 20:80). Phosphorus (P), potassium (K), calcium (Ca) and magnesium (Mg) ratios were determine in the harvested grass. As the average of two years; the highest Ca content (1.08%) was obtained by the "20 YF + 80A" mixture, whereas the highest K content (4.50%) was obtained from the "sole common vetch", the highest Mg content (0.21%) was obtained from the "80YF + 20A" mixture and the highest P content (0.34%) was obtained from the "20TF + 80A" mixture. It is found that the grass of these legumes in sole and their mixture with barley are at a sufficient level in terms of Ca and K; but in terms of Mg and P, they were found below the required limit value for feed rations. It was concluded that the Ca / P ratio of hay obtained from both sole and mixed cultivation poses a risk for animal health. According to these results; it is proposed to add Mg and P-containing substances to the studied grasses. Or mixing them with Mg and P-rich feeds might be a good option.
Bilecik Tarım İşletmelerinin Mevcut Durumu
Authors: Mehmet LAÇİN
Published: September 2020

Bu çalışmanın amacı, Bilecik tarım işletmelerinin faaliyet alanı, üretim, teknik ve pazarlama açısından mevcut durumunun analiz etmektir. Çalışma kapsamında 2016 yılında Bilecik il merkezinde ve ilçelerinde faaliyet gösteren 135 tarım işletmesi ziyaret edilmiştir. Araştırma verileri anket aracılığıyla elde edilmiştir. Elde edilen veriler bilgisayar ortamında analiz edilmiş, 20 başlık altında incelenmiş ve yorumlanmıştır. Belirlenen konu başlıkları arasında istatistiki olarak ilişki olup olmadığını belirlemek amacıyla Ki-Kare testi uygulanmıştır. 4 değişken arasında istatiksel olarak anlamlı ilişki olduğu ancak diğer değişkenlerin birbirinden bağımsız olduğu bulunmuştur. Araştırma bulguları, çalışma bölgesinde en fazla sebze üretimin yapıldığını (% 9,6), tüm yıl tarımsal üretimin sürdürüldüğünü (% 53,3), çalışmaya katılan işletmelerinden çoğunluğunun kapasite artırmayı planlamadığını (% 51,9) ve kimyasal zirai mücadele yapıldığımı (% 77) göstermektedir. Üretimin (% 53,3) tüm yılda devam etmesi sonbahar aylarında üretimin seralarda devam etmesi ile açıklanabilir. Sonuçlar ayrıca, çalışmaya katılan tarım işletmelerinin % 84,4’ünün açık alanda üretim yaptığını, % 31,9’unun damlama sulama yaptığını, % 49,6’sının ise üretim için gerekli malzemeleri il sınırları içinden temin ettiğini göstermektedir. Damlama sulama oranının yüksek olması tarımsal mekanizasyonun olumlu sonucu olarak değerlendirilebilir. Ancak üretim için gerekli malzemelerin il dışından temin edilmesi öngörülmeyen bir sonuçtur. Bunun yanı sıra bulgular, işletmelerin % 63,7’sinin mevsimlik işçi çalıştırmadığını ve işletme görevlilerinin % 70,4’ünün tarımsal fuarlara katıldığını ortaya koymaktadır. Bu sonuç işletmelerin teknolojik gelişmeleri yakından takip ettiğinin bir göstergesi olarak değerlendirilebilir. Araştırma katılımcılarının % 77,8’i tarımla ilgili mevzuatın yetersiz olduğu görüşündedir. Araştırma sonuçlar bu bulgular çerçevesinde tartışılmış ve gelecek araştırmalar için öneriler sunulmuştur.
SPEAKING ANXIETY AMONG PUBLIC SECTOR UNIVERSITY STUDENTS
Authors: Siddique Hadiqa , Raja Farhan , Hussain Qaiser
Published: September 2020

Many students who are doing their majors in English often suffer from English speaking anxiety. The purpose of this study was to examine the reasons that hinder the process of speaking English in the students who had English as their major course of studies in a public sector university in Karachi. The study was conducted using qualitative research approach and the data was collected using focus group discussion. The participants of this study were selected using convenient sampling technique for focus group discussion. The findings revealed that the pronunciation, syntactic structures, insufficient lexical knowledge, fear of negative evaluation, role of a teacher, financial and social factors are the main causes of English-speaking anxiety among English majors. Recommended measures by the students disclosed that if the institution provides them with the suggested speaking opportunities, it could help them improve their anxiety towards speaking in English.
Devices of positivity in the Social Work intervention
Authors: Hernández Valdés Jorge , López de Nava Tapía Sofía , Ramos García Alejandra
Published: September 2020

The history of the intervention of Social Work in the area of health has been built from a device that in the case of the Institutions of Higher Education, Social Sciences and Humanities this acquires a connotation of dispositivity in the Foucauldian sense of reproduction of social domination through the power of vigilance and punishment. In this sense, the objective of this work was to discuss the scope and limits of the positivity device for the case of Social Work and its history of intervention in public health institutions. The discussion will allow us to move towards a reconceptualization scenario in which we see an alternative intervention device that not only reproduces health policies, but also questions them in favor of the groups that are being violated.
Análisis de la flagrancia en el delito de chantaje previsto en el Código Penal del Estado de Sonora
Authors: Medina Wahnnatah Armando , Almada Quintero María Guadalupe , Romero Gómez Ángel Antonio , Medina Almada Ana Lucia
Published: September 2020

En el presente ana?lisis, se exponen consideraciones en relacio?n con los elementos del ili?cito de chantaje, partiendo de los principios primordiales del marco teo?rico respecto al debido proceso, tenemos la seguridad juri?dica y la legalidad, las cuales se sustentan en los arti?culos 14, 16, 19 y 20 de la constitucio?n poli?tica mexicana.

Se aborda tambie?n en este estudio, elementos importantes de los derechos humanos, se estudia en materia penal su fundamento y argumento, al referirnos al co?digo penal para el Estado de Sonora, en su arti?culo 5, advierte que los delitos atendiendo a su momento de consumacio?n, pude ser instanta?neo, cuando la consumacio?n se agota en el mismo momento en que se han realizado todos sus elementos constitutivos; permanente o continuo, cuando la ejecucio?n se prolonga en el tiempo; y continuado, cuando con unidad de propo?sito delictivo y pluralidad de conductas se viola el mismo precepto legal .

Se aborda en el estudio del TIPO PENAL, de CHANTAJE, los elementos que lo constituyen y el momento en que se ejecuta, por u?ltimo se emiten consideraciones finales.
Especificación de un modelo para el estudio de la percepción de seguridad
Authors: Coronado Rincón Oscar , Mejía Rubio Silvia , Quezada Castro Abigail , Blannes Ugarte Adriana Vanessa , Bolivar Mojica Eyder , García Lirios Cruz
Published: September 2020

La seguridad ha preocupado a las autoridades y a la sociedad civil durante los últimos años. Los diferentes sustratos de la sociedad tienen diferentes percepciones sobre la seguridad. El presente documento explora la confiabilidad y validez de un instrumento que mide la percepción de seguridad en los estudiantes de licenciatura al revisar siete dimensiones: territorial, nacional, público (gobierno), humano, público (autoprotección), privado e internacional. En consecuencia, establecer valores y residuos permitieron aceptar la hipótesis nula relación significativa entre las dimensiones teóricas con respecto a los factores ponderados.
La Cooperación Internacional en el Derecho de la TIC: hacia una Carta Iberoamericana de Derechos y Deberes Digitales
Authors: Rodríguez Suárez Daniel Enrique
Published: September 2020

El presente artículo pone de manifiesto la importancia de establecer un modeloefectivo de gobernanza digital basado en derechos y responsabilidades por partede los ciberusuarios. Ad portas de la cuarta revolución industrial; el reconocimientode la existencia de una sociedad hiperconectada homo telecom y de los riesgos quese derivan de las actividades cotidianas, es el punto de partida para emprender untrabajo colaborativo, basado en el modelo de múltiples partes interesadas, yfundamentado en la capacidad que tiene la cooperación internacional a nivelregional, para hacer frente a los desafíos del derecho de las TIC en la era de lainformación. En ese sentido, se eleva una propuesta de construir, a niveliberoamericano, un instrumento de soft law “Carta Iberoamericana de Derechos yDeberes Digitales CIDDI”; este instrumento tiene un alto componente ético, culturaly educativo, no exclusivo de la visión positivista clásica del derecho.
Efectos del estrés sobre el rendimiento académico de estudiantes de la maestría en contaduría en una universidad pública
Authors: Zurita Palomeque Rosaura Judith , Martínez Prats Germán , Mapén Franco Fabiola de Jesús
Published: September 2020

El propósito de esta investigación es identificar cuáles son los factores que causan estrés a losestudiantes de la maestría en Contaduría y las incidencias en su vida cotidiana. El diseñometodológico es descriptivo no experimental, ya que la obtención de los datos se realizó en unsolo momento utilizando como instrumento de investigación: el cuestionario adaptado de Barraza(2007) estructurado en las dimensiones de reacciones físicas, reacciones psicológicas y reaccionescomportamentales. Los resultados obtenidos reflejan que los principales efectos del estrés en losalumnos son fatiga crónica o cansancio permanente, inquietud o incapacidad de relajarse así comoel aumento o reducción del consumo de alimentos.
Bases teóricas en la administración de los recursos humanos
Authors: Hernández Govea Luis Manuel , Martínez Prats Germán , Xiconténcatl Valencia Martha Libny
Published: September 2020

Las organizaciones tienen características muy diferentes de cómo operar dentro del ámbitolaboral, cómo seguir creciendo día con día y uno de los principales pilares es el factor humanoen el que tienen una fortaleza muy importante para el éxito. La competencia entre lasorganizaciones y particularmentelos avances tecnológicos han provocado cambios muyimportantes, que se ven incluso en la forma de administrar las empresas, lo que ha empujado aestas últimas a tener asesores en su plantilla laboral que les ayuden en el área del comportamientohumano de su personal. La cultura de una organización incorpora sus valores, creencias yactitudes, y es la fuerza impulsora de esta conducta.Este artículo expone aquellas posturas teóricas que permitan comprender el quehacer de laadministración de los recursos humanos y su relación coyuntural con el clima organizacionalpara el buen manejo. Ofrece al administrador y al directivo organizacional una comprensión de la dinámica humana del trabajo y de la productividad de las personas, distinta de la visión queofrecen los modelos prescriptivos gerencial eso las tradiciones empresariales y, por tanto, másajustada al saber científico desarrollado en el contexto cultural del propio país y región.
El recurso humano en las empresas del sector comercio al por menor
Authors: Rincón Ornelas Rosa María , Clark Valenzuela Ernesto
Published: September 2020

Hoy en di?a los entornos competitivos actuales requieren que se atienda en lo que estoy, en la actividad, negocio o profesio?n y tener presente que debo de actuar de una manera profesional, mejorando el comportamiento lo mejor posible. De acuerdo a lo anterior se considera que los dirigentes de las empresas se deben de encargar de hacer lo mejor posible para su recurso humano, lo cual traera? beneficios para ellos mismos. Desde esta perspectiva en esta investigacio?n se estudia el recurso humano en las empresas del sector comercio al por menor y sus beneficios en los trabajadores. Se realiza una indagacio?n sobre cua?l es la situacio?n que se presenta una vez que las empresas en sus pra?cticas de recursos humanos brindan una formacio?n de recursos humanos, participacio?n de los empleados en toma de decisiones, que ofrezcan un plan interno de desarrollo profesional, que se de? el vi?nculo entre la remuneracio?n y los sistemas de evaluacio?n del desempen?o, autonomi?a de los empleados, trabajo en equipo y motivacio?n laboral. Lo anterior siendo de gran importancia, ya los empleados del a?mbito comercial y de ventas son los que en u?ltimo te?rmino representan a la empresa de cara a sus clientes y gestionan las relaciones entre los compradores y los vendedores, por tanto, son fundamentales para construir unas buenas relaciones comerciales en las entidades econo?micas.
Structural factor exploring sustainability perceptions
Authors: Molina-Ruiz Héctor Daniel , Juárez-Nájera Margarita , Bustos-Aguayo José Marcos , Hernández-Valdés Jorge , Castro-Guzmán Martín , García Lirioz Cruz
Published: September 2020

Often, the total quality has been instrumented before being weighted. The strategies even precede a diagnosis in Mexican organizations, but in an opposite sense, the present work set out to establish the reliability and validity of an instrument to measure the perception of total quality based on three indicators related to management. , production and transfer of knowledge. A non-uexperimental study was carried out with a non-probabilistic selection of 124 administrative staff and employees from an organization in central Mexico. From a structural model, it was found that management affects production and this about the total perceived quality, although there are lines of research concerning empathy, commitment, entrepreneurship, satisfaction and happiness in relation to the implementation of continuous improvements to the quality of processes and products.
Situación Jurídico-laboral de los migrantes: haitianos en Mexicali, Baja California
Authors: Ramos Iveth , Sosa y Silva García Yolanda
Published: September 2020

En los años recientes, se ha visto un incremento en las migraciones y los desplazamientos, que en muchos casos son forzados, ya sea por conflictos, persecuciones, desastres naturales por el cambio climático, falta de oportunidades en su lugar de origen, entre otras causas. Derivado de este fenómeno, Mexicali no ha sido una ciudad ajena a ello, pero en los años recientes se ha observado un mayor flujo migratorio de personas con orígenes muy distintos a los que la ciudad estaba habituada. Tal es el caso del grupo de migrantes haitianos, que llegó aproximadamente en 2016 a la ciudad, con la intención de cruzar a Estados Unidos, pero por situaciones ajenas, su objetivo tuvo que cambiar y que elegir otras opciones para asentarse y tener mejores oportunidades de vida. En el presente trabajo, se pretende exponer, analizar y verificar la tramitología que tienen que realizar ante el Instituto Nacional de Migración, los migrantes haitianos que deciden quedarse en Mexicali y obtener un trabajo decente para sobrevivir en la ciudad.
Percepción de seguridad frente a la COVID-19
Authors: Bustos Aguayo José , García Lirios Cruz , Juárez Nájera Margarita , Juárez Nájera Margarita
Published: September 2020

La seguridad ha preocupado a las autoridades y a la sociedad civil durante los u?ltimos an?os. Los diferentes sustratos de la sociedad tienen diferentes percepciones sobre la seguridad. El presente documento explora la confiabilidad y validez de un instrumento que mide la percepcio?n de seguridad en los estudiantes de licenciatura al revisar siete dimensiones: territorial, nacional, pu?blico (gobierno), humano, pu?blico (autoproteccio?n), privado e internacional. En consecuencia, establecer valores y residuos permitieron aceptar la hipo?tesis nula relacio?n significativa entre las dimensiones teo?ricas con respecto a los factores ponderados.
Associação entre o nível de atividade física e doenças crônicas não transmissíveis em idosos
Authors: Oliveira Daniel Vicentini de , Pereira Camila Mariani , Nascimento Júnior José Roberto Andrade do , Inhoti Priscila Almeida , Antunes Mateus Dias , Cunha Paolo Marcello da , Fiorese Lenamar
Published: September 2020

O presente estudo teve como objetivo investigar a prevalência de doenças crônicas não transmissíveis (DCNTs) e sua possível associação com o nível de atividade física e comportamento sedentário de idosos usuários das Unidades Básicas de Saúde (UBS). Trata-se de um estudo epidemiológico analítico, observacional, correlacional e transversal, realizado com 654 idosos de ambos os sexos, usuários de UBS do município de Maringá, Paraná, Brasil. Foram coletados dados sociodemográficos e de saúde. O nível de atividade física e o comportamento sedentário foi avaliado por meio do International Physical Activity Questionnaire (IPAQ), versão curta. Para a análise dos dados foi utilizado a estatística descritiva e inferencial, por meio dos testes Kolmogorov-Smirnov, Krustal-Wallis e Qui Quadrado, considerando um nível de significância de p<0,05. A hipertensão arterial sistêmica é a DCNT mais prevalente nos idosos (57,9%). Os idosos das UBS com três ou mais morbidades associadas realizam menos dias de atividades moderadas por semana quando comparados com os idosos com nenhuma ou com um ou duas. Conclusão: Baixos níveis de atividade física estão associados à algumas DCNTs (doença do coração, AVC e doença pulmonar) em idosos das UBS.
Bullying escolar: estudo realizado em escolas públicas de Vale do Sol, RS, Brasil
Authors: Azevedo Franciele Katiúscia de , Borfe Leticia , Elesbão Heloisa , Mayer Sandra Mara
Published: September 2020

Com o passar dos anos, a violência escolar tem-se agravado cada vez mais, causando sérios problemas aos envolvidos e preocupação aos familiares e sociedade em geral. Este estudo objetiva descrever o comportamento agressivo das crianças e adolescentes de duas escolas públicas do município de Vale do Sol, RS, Brasil. São sujeitos participantes desta pesquisa 182 alunos de ambos os sexos, do 6º ao 9º ano de uma escola estadual e outra municipal do mesmo município. Para a coleta dos dados foi aplicado um questionário individual com anamnese e questões objetivas referentes às agressões, locais em que ocorrem e atitudes tomadas no ambiente escolar. A análise estatística foi realizada no programa SPSS 20.0. Os resultados mostram que 34,6% dos alunos do 6º ao 9º ano já sofreram algum tipo de agressão na escola, em sua maioria na forma verbal, tendo ocorrência principalmente em sala de aula. A maioria dos entrevistados relatou que os professores impediram muitas vezes as agressões, mas ao serem questionados sobre o que fazem ao presenciar uma agressão, eles relatam não reagir ao acontecido, mas acham que deveriam tomar alguma atitude. Este estudo nos permite concluir que o bullying ainda está muito presente no ambiente escolar e se configura em sua maioria de forma verbal, o que pode acarretar sérios problemas de convivência entre estas crianças e adolescentes. Sendo assim, ações que visem à conscientização das consequências do bullying devem ser incorporadas no ambiente escolar, tornando-o um local harmonioso e acolhedor.
Do International Capital Flows Worsen Macroeconomic Volatility in Transition Economies?
Authors: Hegerty Scott
Published: September 2020

The 2008 financial crisis helped precipitate a near crisis in the transition economies of Central and Eastern Europe, which ultimately resulted in severe output declines throughout the region. What share of the responsibility did capital movements, particularly “hot money” flows, play in the rapid growth and subsequent recession in the periphery of the European Union? To answer this question, we examine the responses of output, consumption, and investment variability to shocks to both Foreign Direct Investment and non-FDI flows, using quarterly data from the mid-1990s to 2010. Impulse-response and variance decomposition analysis shows that “hot” non-FDI flows contribute more to macroeconomic volatility than do more stable FDI flows, and that certain countries, particularly those with fixed exchange rates, seem to be more vulnerable to shocks than others.
The Effect of Immigration on Economic Growth in an Ageing Economy
Authors: Muysken Joan , Ziesemer Thomas
Published: September 2020

Immigration can help to alleviate the burden ageing presents for the welfare states of most Western Economies. To show this, a macroeconomic model is developed which deals with the effect of both ageing and immigration on economic growth, through home-biased capital accumulation. The model includes a detailed description of the labor market, analyzing the interaction with low-skilled unemployment. The empirical relevance of some crucial model assumptions is shown to hold for the Netherlands, 1973 – 2009, using a vector-error-correction model. Simulations of the latter model show that permanent shocks in immigration will help to alleviate the ageing problem in the long run, as long as the immigrants will be able to participate in the labor force at least as much as the native population. Moreover, the better educated the immigrants are or become, the higher their contribution to growth will be.
Estimation of the size of tax evasion in Greece
Authors: Athanasios Anastasiou , Eleni Kalamara , Charalampos Kalligosfyris
Published: September 2020

The purpose of this paper is to estimate the extent of tax evasion in Greece for the period 1980-2018. For this estimation we have chosen to apply an indirect method of approach to the issue, as developed by Tanzi, based on the assumption that estimating the size of the shadow economy can lead us to a safe measurement of the extent of tax evasion. More precisely, through the Currency Demand approach which is based on the basic assumption that activities under the shadow economy constitute a direct response of taxpayers to the increased tax burden and also that cash is mainly used to conduct such transactions and of the wealth derived from them, the size of the shadow economy was determined using the method of the University of Leicester research team and then the level of tax evasion was assessed by imposing an annual tax rate on it as a ratio of total tax revenue to Gross Domestic Product. The results showed a significant increase of the size of tax evasion during the period considered, while the model estimation showed that most of the tax evasion came from direct taxation.
Additional Transportation Costs benefit Consumer Surplus and Social Welfare in a Bilateral Duopoly
Authors: Han Sangheon , Joon Lee Dong
Published: September 2020

This paper examines the location selection by retailers in a bilateral duopoly. We suppose that the location is unconstraint. We compare two cases. One case is that each retailer incurs its transportation costs in order to purchase goods from its manufacturer. Another case is that it does not pay the transportation costs. Our conclusions are two. One is that both retailers locate inside the city, when retailers incur the transportation costs. The other is that consumer surplus and social welfare is larger under retailers’ paying transportation costs than under retailers’ no-paying transportation costs.