bluuebunny/crossref_metadata_2025_split huggingface dataset:
Improved mathematical model of particle trajectories in multimodal electrostatic separators
Authors: Maammar Mohamed , Zeghloul Thami , Aksa Wessim , Medles Karim , Benabderrahmane Ahlem , Renoux Pascal , Dascalescu Lucian 
Published: October 2019

Abstract
The multimodal electrostatic separator has been designed to facilitate the feasibility assessment of corona-, tribo-, or purely-electrostatic processes of selective sorting of the constituents of granular mixtures. The versatility of the separator has imposed the development of an equally-agile simulation program for modelling the particle behaviour in each of the operational configurations of the machine. Thus, the paper discusses the numerical models that describe the various specific physical phenomena: corona-charging at the surface of the belt conveyor; induction charging of the conductive particles in contact with the grounded electrode; impact of particles with the rotating-roll high-voltage electrode. An example of conductive and insulating particles trajectories computation is given. The simulated results are compared with the experimental observations.
Atmospheric Potential Gradient Measurements from a Rooftop in Bangkok
Authors: Matthews J C , Wright M D , Navasumrit P , Ruchirawat M , Shallcross D E 
Published: October 2019

Abstract
Atmospheric potential gradient measurements at 1 Hz (averaged to 1 minute samples) were taken on the roof of a 6th floor building, approximately 100 m from a busy toll road in Lak Si, northern Bangkok. The measurement period covered the transition from hot season into rainy season. The heavy monsoon rains and heavy traffic can both be significant disruptors of the fair weather atmospheric potential gradient. Heavy traffic increased potential gradient due to aerosol loading, while rain storms increased the magnitude, but also changed the sign of the field due to charge processes within clouds. Increasing relative humidity led to a decrease in potential gradient, implying a lack of hygroscopic growth. Cross correlations of aerosol number in different size fractions showed that aerosols with a D50 value of 155 nm had the strongest correlation. A strong diurnal signal is present in frequency domain analysis of potential gradient.
Study of electrohydrodynamic phenomena in high temperature high pressure nitrogen
Authors: Bologa A , Paur H P , Woletz K , Stapf D 
Published: October 2019

Abstract
The study of corona discharge current-voltage characteristics (CVCs) in high temperature high pressure (HTHP) gases is an important step in development of compact HTHP electrostatic equipment. The scope of the current work was the study of corona discharge CVCs in HTHP nitrogen. Corona discharge ionizer was installed inside of a HTHP casing. Ionizer included star-shaped high voltage electrodes installed inside of a grounded tube electrode. The grounded electrode could be heated. Tests were carried out at various gas pressure and grounded electrode temperatures. The CVC-direct and CVC-indirect characteristics were measured for positive and negative polarity of applied voltage. For the same values of applied voltage, current for negative corona was higher than for positive one. The increase of gas pressure stabilized corona discharge and increased corona onset voltage. Operation of the ionizer at CVC-indirect ensured stable corona discharge. Corona discharge CVCs have shown hysteresis loop which area depended on gas pressure and temperature.
Time Resolved Measurement of Dielectric Particles Velocity on Standing Wave Electric Conveyor using PTV Technique
Authors: Zouaghi Ayyoub , Zouzou Noureddine , Braud Patrick 
Published: October 2019

Abstract
The interaction between micro-sized dielectric particles and standing wave electric field is investigated experimentally in this paper. The particles are deposited on a conveyor made of a series of copper electrodes on a dielectric surface and moved by an electric field. The standing wave electric field is generated by applying 2-phase voltage signals to the electrodes. Particles motion is recorded using high speed camera, and then a Particles Tracking Velocimetry (PTV) based post-processing is carried out in order to track each particle and evaluate its velocity. The main results indicate that the particles move toward both directions perpendicular to the electrodes close to the surface and their velocity increases. Some of them can reach the synchronism velocity equivalent to that of the electric wave. However, most of the particles cannot reach this velocity because of the contribution of adhesion and drag forces.
Bond-Graph Input-State-Output Port-Hamiltonian Formulation of Memristive Networks for emulation of Josephson Junction Circuits
Authors: Al-Mashhadani Israa Badr Nasser , Hadjiloucas Sillas 
Published: October 2019

Abstract
A bond graph Input-State-Output Port-Hamiltonian formulation of memristive networks for Josephson junction circuits in state space is presented. The methodology has applications to the modeling of SQUIDs and other non-linear transducers and enables the formulation of input-output models of complex components embedded in non-linear networks.
Potentialities of flexoelectric effect in soft polymer films for electromechanical applications
Authors: Guiffard Benoit , Saadeh Maria , Frère Pierre , Seveno Raynald , El-Gibari Mohammed , Sghaier Tessnim , Merupo V I , Kassiba Adi 
Published: October 2019

Abstract
Among the transduction mechanisms of interest for sensing and/or actuation applications at nano/micro scale, the piezoelectric effect has been widely exploited owing to the solid state nature of piezoelectrics, the large ability of specific classes of materials for the mechanical-to-electrical energy conversion and easy integration. However, every piezoelectric (also generally ferroelectric) presents well-known intrinsic drawbacks such as required poling step and related aging. In contrast, uniquely flexoelectric materials do not suffer from these disadvantages because flexoelectricity, a universal effect in all dielectric solids defined as the electrical polarization induced by a strain gradient, does not imply preliminary electric field-induced macroscopic polarization. Besides, strain gradient may be easily obtained by bending plate or cantilever-shaped structure and in this case it is nothing but the local curvature of the flexible system. Thus, as strain gradient (curvature) inversely scales with both elastic stiffness and thickness, this study will focus on the evaluation of the potentialities of flexoelectric effect in soft polymer films for electromechanical applications, with an emphasis on the thickness influence. In this way, analytical results combined to experimentally obtained effective flexoelectric coefficients for some typical polymer classes may provide guidelines for the development of soft and low frequency flexoelectric mechanical transducers.
NORM, a Health concern to Personnel exposed to Formation Drill Cuttings – Regulation issue in Nigeria
Authors: Okoro E E , Sanni S E , Emetere E M 
Published: October 2019

Abstract
During the drilling operations, formation rocks or shales drilled are removed from the wellbore as drill cuttings. These cuttings are real-time representative of the formation being drilled at that section of the wellbore, and it represents the formation of compositions and properties. Regulations for most oil well developments stipulate that the methods used for managing drill cuttings are dependent on the nature and type of drilling mud system used for the drilling operation. When the formation with these relatively high NORM contents is drilled using the drilling mud, these NORM traces are transported to the surface as drill cuttings; thus, exposing the personnel to health dangers and the immediate environment. The short and long-term health effects of NORM exposure include skin burns, harmful tissues reactions, increase the risk of lung cancer, mutation of somatic cells and leukemia. DPR has some standards and guidelines established to effectively police and regulate E&P industry activities in Nigeria. These guidelines and standards also take into consideration, the need for advanced pollution control strategies and technological treatments. However, the presence and harmful consequences of NORM in these drill cuttings are not considered in the current form of these regulations and guidelines. This study proposes the inclusion of NORM as a means of updating the already established guidelines and regulations for handling and treating these drill cuttings because they constitute the majority of the waste and toxic materials generated during drilling operations.
Importance of Rural Biomass Post-Harvest Waste – An Overview
Authors: Emmanuel Okoro Emeka , Samuel Sanni E. , Moses Emetere E. 
Published: October 2019

Abstract
This study rather than focus on food security examines the potential in utilizing Post-Harvest Waste (P-HW) materials and their benefits to the immediate rural communities where lignocellulose waste are found in abundance. It was observed that researchers have proposed a lot of unique approaches to managing solid waste generation; with emphasis on perfect waste collection and disposal, but these approaches are very expensive considering the tight budgeting expenses Nigeria is faced with. This study shows that some rural communities experience huge post-harvest organic wastes from their farms and the cost of these losses has been estimated, which then forms a good spot to start the implementation process for this initiative. The research highlights the overview benefits of adopting microbial and pyrolysis approach in converting the lignocellulosic aspect of these waste to economically viable products that will have a direct positive impact on the immediate community. This study proposed a modified fast pyrolysis approach in the conversion process to reduce the production of pyrolytic gas and optimize the production of biochar and pyroligneous acid. Adopting these approaches will reduce the amount of carbon emitted into the atmosphere when burning these waste and produce bio-products instead of synthesized chemical products that have health implications.
Influence of nanoparticles deposition on surface roughness and heat transfer characteristics of nanofluids – A review
Authors: Ogbonnaya Mercy , Ajayi Oluseyi O. , Waheed M.A , Oyedepo Sunday O. , Popoola A.P.I. , Popoola O.M. 
Published: October 2019

AbstractThe inherent low thermal conductivity of working fluids used in transferring heat from energy system makes the performance of the system less efficient. The introduction of nanoparticles into the working fluid enhances the thermal conductivity of the fluid, thereby improving the overall performance of the energy system. Deposition of nanoparticles on the heat transfer surface of the heat exchanger occurs and this affects the mechanism of bubble formation, wettability, surface roughness of the heating surface and the overall heat transfer coefficient. In this review, the use of nanofluid showed improvement in the critical heat transfer flux (CHF) of the heat transfer fluid while the deposition of nanoparticles on the heater surface enhanced the wettability for pool boiling but caused deterioration in the heat transfer. The influence of nanoparticles deposition on surface characteristics and heat transfer coefficient during single and two phase flows in flow boiling needs to be further investigated.
Review Of Heat Transfer Enhancement In Energy Conversion Systems; Nanotechnology
Authors: Kelvin Efemwenkiekie U. , Opemipo Atiba E. , Sunday Oyedepo O. 
Published: October 2019

Abstract
Different heat transfer fluids with very high thermal stability are highly desirable for heat exchangers. Inadequate understanding on the basic principle of nanofluid flow, unsatisfactory experimental data on nanofluid heat transfer and general context for heat transfer correlation is yet to be established. The work under focus will be on highlighting working principles, problems hindering practical application of unconventional heat exchangers devices, and the various means of utilizing nanotechnology in improved efficiency. The study investigates experiments on heat exchangers in the last decade, the gap in knowledge and future applications of nanotechnology in improving heat transfer. This review summarizes, the significant advances of various nanotechnology in heat transfer application of recent energy conversion system.
Protective Effect of Cajanus cajan in Hepatotoxic Rats
Authors: Evbakhavbokun  , Winifred O. , E.J. Emeka Iweala 
Published: October 2019

Abstract
Hepatotoxicity results from overload of chemicals and drugs including N-Nitrosodiethylamine (NDEA), a nitrosamine found in smoke, meat and food products. This study examined the hepatoprotective potential of Cajanus cajan in male Wistar rats. Hepatotoxicity was induced by administration of NDEA at 200mg/kg while Cajanus cajan was administered at 200mg/kg, 400mg/kg and 800mg/kg for 28 days. Body weight, liver weight and markers of hepatotoxicity including Alanine aminotransferase (ALT), Aspartate aminotransferase (AST) and Albumin (ALB) were evaluated. NDEA treated group showed a marginal increase in body weight and a significant (p < 0.05) increase in liver weight. The Cajanus cajan treated groups showed a significant (p < 0.05) increase and decrease respectively in body and liver weights. NDEA treated group significantly (P<0.05) increased ALT and AST and significantly reduced ALB. Cajanus cajan significantly (P<0.05) decreased ALT and AST and significantly (P<0.05) elevated ALB. The results indicate that Cajanus cajan ameliorates NDEA-induced hepatotoxicity.
Performance enhancement using appropriate mass charge of R600a in a developed domestic refrigerator
Authors: Banjo Solomon O. , Bolaji Bukola O. , Ajayi Oluseyi O. , Olufemi Babalola P. , Osagie Ibhadode , Onokwai Anthony O. 
Published: October 2019

Abstract
This paper presents performance analysis of a domestic refrigeration system using R600a as refrigerant. Investigation was conducted experimentally to select an appropriate refrigerant mass charge for the system and to compute the cooling system performance characteristics under ambient temperature of 29°C. The choice of the hydrocarbon refrigerant (R600a) became so imperative due to notable influence of chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs) on global warming and ozone depletion. UNFCCC and Montreal Protocol regulation have banned the use of halogenated refrigerants in cooling and heating systems. The paper reveals that the power consumed by the system using mass charge of 15 g refrigerant was reduced by 9.3 and 10.9% compared with the 10 and 25 g refrigerant mass charges respectively. In addition, the results show that the coefficient of performance (COP) of the refrigeration system while working with 15 g is 24.7 and 20.2% higher than when the system worked with 10 and 25 g refrigerants mass charge respectively. More so, the system attained an evaporator air temperature of -12 °C in 2 hours, which makes 15 g charge refrigerant appropriate for the running of the developed system that has a volume capacity of 68 liters.
The Impact of Traffic Gridlock on Values of Residential Properties in Apapa, Lagos Nigeria
Authors: Iroham C O , Okubanjo T , Joshua O , Okagbue H I , Emetere M E , Akinjare O A , Peter J N , Akinwale O M 
Published: October 2019

Abstract
Traffic gridlock has been a concern in research particularly in determining its effect on property values. Resultant findings have either been a negative or positive impact. For the case of Apapa in Lagos State which is the focus of this present study, traffic gridlock has been an experience of over ten years, hence the need to discover its impact on various property value types as against the collective findings in most previous research. Student-T test of significance at a 95% level of confidence was adopted with results derived for all property types of the calculated T result far outweighing that of the stipulated Tabulated T result of 1.645. These findings for all property types indicate that the increase in property values for various property types have not been distorted by the traffic gridlock and as such investors in residential properties in the study area will always make their profit notwithstanding the gridlock. The researchers hereby advocated further research in determining the choice of residency in Apapa notwithstanding the traffic gridlock.
Mapping of Uranium-238 Deposit and its Contribution to Indoor Radon Gas in Ota, Ogun State, Nigeria
Authors: Adewoyin O. O. , Omeje M. , Onumejor C. A. , Adagunodo T. A. , Ndubuisi A. , Nwaluka V. O. , Akinpelu A. , Joel E. S. 
Published: October 2019

Abstract
In the present study, the distribution of uranium-238 was mapped from the background radiation of the area of study in order to determine its contribution to the concentration of indoor radon. The background radiation was studied using the handheld gamma spectrometer (RS 125) while the indoor radon concentration was measured with a Durridge RAD7 instrument. The results obtained showed variation in the distribution of 238U, 232Th and 40K in the study area with values ranging between 17.9 ± 0.3 and 58.05 ± 0.3, 2848 ± 10541 ± 0.8 and 3.25 ± 0.2 and 11.48 Bq/kg respectively. Furthermore, the indoor radon concentration was determined for the office on the ground floor, the result obtained was noted to be between 20 and 160 Bqm−3 which is far higher than the result obtained for the office on the first floor which is BDL-19 Bqm−3. In each cases, the results are lower than the international recommended safe limit of 200 Bqm−3. Therefore, it can be concluded that the background radiation from the soil in the premises and under the building contributes to the high concentration of indoor radiation in the office.
Board Expertise and Sustainability Reporting in Listed Banks in Nigeria
Authors: Umukoro O E , Uwuigbe O R , Uwuigbe U , Adegboye A , Ajetunmobi O , Nwaze C 
Published: October 2019

Abstract
Despite the growing evidence on the determinants of sustainability reporting, there exist limited and inconclusive studies on the impact of board expertise on sustainability reporting. This study investigates the influence of environmentally sensitive, certified or educated board members on the disclosure of sustainability report. Based on the static panel data regression estimators for 10 Nigerian Deposit Money Banks over the period of 2014-2016, the study revealed that highly educated directors have an altogether constructive influence on the sustainability report disclosure while controlling for corporate administration and firm-level qualities. In addition, we find that the executive and non-executive directors have low experience in environmental issues resulting in an insignificant effect on the disclosure of sustainability reporting. This paper suggests that firms should allow more directors with environmental background, who have a lower motivation to boost transient returns since they are likely to influence environmental performance.
Short review on the prospects of human biogas utilization in Nigeria
Authors: Emetere M.E. , Adesina T. A. 
Published: October 2019

Abstract
Energy challenge in Nigeria is really disturbing due to many factors that borders on the inability of the national grid to meet-up with the huge energy demands in the most populated country in Africa. About 85% industries and domestic users patronize fossil fuel generators. This development had increased the air pollution load over the country. In this research, fourteen years dataset from the Nigeria Metrological Agency (NIMET) was used to simulate the energy accruable from solar energy in Nigeria. The study is poised to enhance higher patronage of solar technology in the research site.
Solar energy estimation and generation in Ibadan Nigeria
Authors: Emetere M.E. , Emetere J.M. , Diana E. 
Published: October 2019

Abstract
Energy challenge in Nigeria is really disturbing due to many factors that borders on the inability of the national grid to meet-up with the huge energy demands in the most populated country in Africa. About 85% industries and domestic users patronize fossil fuel generators. This development had increased the air pollution load over the country. In this research, fourteen years dataset from the Nigeria Metrological Agency (NIMET) was used to simulate the energy accruable from solar energy in Nigeria. The study is poised to enhance higher patronage of solar technology in the research site.
Review On Probiotics Potentials, Nutritional Composition Of Bambara Nut (Vigna Subterranea (L.) -An Underutilized LegumE
Authors: Nwinyi Obinna C , Umane Phoebe O 
Published: October 2019

Abstract
Bambara nut is one of the underutilized legumes. Conversely this underutilized legume could be utilized to solve the ravaging food security issues in sub-Saharan Africa owing to its balanced nutritive composition. Bambara nut limited use, is because of the antnutritional factors, hard to cook phenomenon and difficulty in dehulling. Because of high global demand on food security, there is an urgent need to review possible methods that could reduce the limiting factors to the widespread use of this crop and enunciate other benefits derivable from this legume. In this review, we appraised the nutritional composition of Bambara nut from different geographic locations, commonly associated bacteria species that predominate mostly during Bambara fermentation and their potential uses as probiotics. Expedient areas for further research were highlighted in this paper
Comparative Analysis of Biogas Produced from Cow Dung and Poultry Droppings
Authors: Diagi Evangeline A , Akinyemi Marvel L , Emetere Moses E , Ogunrinola Iyanuoluwa E , Ndubuisi Amanda O 
Published: October 2019

Abstract
This study involves a comparative analysis of two waste substrates; cow dung and poultry droppings. The purpose of this study was to ascertain which of the waste substrates produces a greater yield of biogas, their individual retention period as well as the percentage of the methane content in the gas generated. The study was divided into two experiments which comprised of a water displacement set up in a laboratory and one 30 L fixed dome digester for each waste substrate. In both experiments waste substrates were mixed with water in ratio 1:1 and operated at a mesophilic temperature condition. In the laboratory, the daily gas yield of the individual substrates in ml was obtained, it was observed that cow dung produced an average of 29.9 ml of biogas per day and the poultry waste produced 60.7 ml per day. A gas analysis was performed to obtain the gas profile of gas produced from the two substrates. As deduced from the analysis, cow dung had a methane and CO2 weight percentage of about 92 wt% and 6.68 wt% respectively, while poultry droppings had about 90 wt% methane and 6.56 wt% CO2.With the aid of a constructed mini gas stove, a flame test was performed, which gave off a blue flame. Hence, the two substrates are efficient for biogas production.
Air pollution Estimation Over Brikama
Authors: Emetere M.E. , Olawole O.C. 
Published: October 2019

Abstract
Recent reports on the air pollution over Brikama-Gambia by United Nations Environment Programme (UNEP) and the National Environment Agency (NEA) may be shocking. In this paper, fifteen years primary (aerosol optical depth) dataset was obtained from the Multi-angle Imaging Spectro-Radiometer (MISR). The secondary datasets were generated from the primary dataset to understand the short and long term effect of aerosol loading over Brikama. The dataset is important to help researcher understand the dynamics of the aerosol loadings in the area. It was discovered that the air pollution over Brikama is not seasonal and do not come from same source. It was observed that the pollution over Brikama is determined by the massisve influx and migration of human population.