Concept of A Low-Cost Hybrid Car

Fuel economy and emissions reduction are the vital tasks, which are currently being solved by dismissing cars with only internal combustion engines to the benefit of electric and hybrid electric vehicles (HEV). HEVs have a significant advantage over electric vehicles, namely a bigger drive range and independence from the charging stations at hand. However, high cost and big weight of HEVs discourage their wider use. To minimize the cost and weight of HEV, the algorithm of its power plant operation is changed. This paper presents a method for calculating the electric drive mode of a hybrid vehicle in accordance with the proposed algorithm for the power plant operation. The results of calculation of the main characteristics are presented and analyzed. The experimental studies were carried out with the hybrid vehicle developed on the base on the Lanos pickup vehicle. The research results showed good agreement between the experimental and the calculated results. The proposed technical solution is presented as practical and effective. The results of this work can be used in the automotive industry. The development helps to reduce the cost and weight of hybrid vehicles, maintaining their operational characteristics and good economic and environmental indicators

The Practices of Treating Deep Carious Lesions Compared with the Dental Curriculum in Turkish Dentistry

Objective: The aim of this cross-sectional study is to investigate Turkish dentists’ opinions and preferences regarding the management of deep carious lesions and compare them with modern dental education concepts as provided by dental schools. Methods: Questionnaire 1 and Questionnaire 2 were sent separately to dental practitioners via the Turkish Dental Association and to university department heads of restorative dentistry. The data obtained were analyzed using chi-square tests and one-way ANOVA tests (p \u3c 0.05). Results: Regarding Questionnaire 1, most of the dentists (89.3%) responded that caries lesions should be removed completely up to the hard cut-off condition of the cavity floor. There was a statistically significant difference between female and male dentists’ preferences on less invasive treatment (p \u3c 0.05). Female dentists prefer less invasive treatment compared with male dentists (p = 0.002). Relatively older dentists (mean age = 41.8) are more inclined towards complete caries removal even if pulp exposure is likely (p = 0.040). The results of Questionnaire 2 reveal that there is no association between the time spans of education at dental schools and their caries removal approach curriculum (p \u3e 0.05). Most department heads of restorative dentistry prefer to apply complete caries removal (78.5%, n = 51). Conclusion: Despite today’s curriculum encouraging less invasive caries removal techniques, most dentists prefer more invasive treatment options. Continuous education of contemporary dentistry could update these clinical treatment attitudes of dentists and improve their clinical practice

Concept of A Low-Cost Hybrid Car

Fuel economy and emissions reduction are the vital tasks, which are currently being solved by dismissing cars with only internal combustion engines to the benefit of electric and hybrid electric vehicles (HEV). HEVs have a significant advantage over electric vehicles, namely a bigger drive range and independence from the charging stations at hand. However, high cost and big weight of HEVs discourage their wider use. To minimize the cost and weight of HEV, the algorithm of its power plant operation is changed. This paper presents a method for calculating the electric drive mode of a hybrid vehicle in accordance with the proposed algorithm for the power plant operation. The results of calculation of the main characteristics are presented and analyzed. The experimental studies were carried out with the hybrid vehicle developed on the base on the Lanos pickup vehicle. The research results showed good agreement between the experimental and the calculated results. The proposed technical solution is presented as practical and effective. The results of this work can be used in the automotive industry. The development helps to reduce the cost and weight of hybrid vehicles, maintaining their operational characteristics and good economic and environmental indicators

ESTET – NEW INNOVATIVE SPECIALTY FOR MASTER STUDENTS

Problem. Currently, new educational reforms are intensively being implemented in Ukraine. This is achieved, including, by the development and implementation of new innovative joint training programs. Goal. To improve higher education in accordance with the changing needs of economic and social spheres in the road transport sector due to the growth of innovative energy-efficient and energy-saving technologies. To increase the competitiveness of graduates in employment and the productive cooperation between the universities. To reduce energy consumption and to replace traditional sources by «green» forms of energy in the transport sector as well. Methodology. The analysis of existing joint educational programs for masters was conducted. There was accomplished the analysis and monitoring of the labor market with the determination of its urgent and future needs, taking into account the development of modern electric transport. Results. The project for implementation of the new innovative master’s program in the specialty «Energy-saving technologies in transport» (ESTeT) has been developed. We have proposed the structure of a new specialty. The work packages that address specific tasks in the overall system of the ESTeT project implementation have been briefly described. The division of the new master's specialty into its constituting structural elements has been carried out. Originality. We proposed the new innovative educational joint program for masters ESTeT. Practical value. The implementation of new innovative joint specialties in the field of higher education in Ukraine provides an opportunity to increase the level of Ukrainian higher education itself. This will allow students to acquire the appropriate competencies in the field of study and expand their applications. Also, obtaining two diplomas (Ukrainian and European) by students will significantly expand their employment opportunities

Estimating Dynamic and Flow Characteristics of Electromagnetic Dispenser for The Kraz Truck Converted to Gas

The problems of worldwide environmental degradation, global warming, scarcity of fossil fuels have caused the replacement of ICE vehicles with electric ones. For the countries with underdeveloped economy, it is important to find more affordable ways to solve this problem. One of them is to convert the cars with ICE into more environmentally friendly and economical ones, such as gas-powered cars. Yet, the conversion of diesel cars usually results in power loss. The work of the electromagnetic gas dispenser (EGD) of the engine power supply system significantly affects the efficiency of the gas engine. Therefore, the aim of the study was to determine the dynamic and flow characteristics of the EGD of the KrAZ truck (Ukraine) converted to gas, and to provide recommendations for improving the efficiency of its operation. The object of the research was the working processes of the EGD power supply system of 6ChGN13/14 engine, converted from diesel engine and equipped with a gas turbine supercharger. The paper presents the results of experimental studies on determining the effect of operating voltage on the dynamic characteristics of EGD. The dependences of dynamic and flow characteristics of the EGD on the change of the control signal frequency and the dependence of efficiency through the EGD flow nozzle on the control signal duration were obtained; the effect of the return spring stiffness on the dynamic and flow characteristics of the EGD were determined. The results of the work are designed to increase the efficiency of diesel trucks converted to gas

Estimating Dynamic and Flow Characteristics of Electromagnetic Dispenser for The Kraz Truck Converted to Gas

The problems of worldwide environmental degradation, global warming, scarcity of fossil fuels have caused the replacement of ICE vehicles with electric ones. For the countries with underdeveloped economy, it is important to find more affordable ways to solve this problem. One of them is to convert the cars with ICE into more environmentally friendly and economical ones, such as gas-powered cars. Yet, the conversion of diesel cars usually results in power loss. The work of the electromagnetic gas dispenser (EGD) of the engine power supply system significantly affects the efficiency of the gas engine. Therefore, the aim of the study was to determine the dynamic and flow characteristics of the EGD of the KrAZ truck (Ukraine) converted to gas, and to provide recommendations for improving the efficiency of its operation. The object of the research was the working processes of the EGD power supply system of 6ChGN13/14 engine, converted from diesel engine and equipped with a gas turbine supercharger. The paper presents the results of experimental studies on determining the effect of operating voltage on the dynamic characteristics of EGD. The dependences of dynamic and flow characteristics of the EGD on the change of the control signal frequency and the dependence of efficiency through the EGD flow nozzle on the control signal duration were obtained; the effect of the return spring stiffness on the dynamic and flow characteristics of the EGD were determined. The results of the work are designed to increase the efficiency of diesel trucks converted to gas

Effect of resin-modified glass-ionomer cement lining and composite layering technique on the adhesive interface of lateral wall

Interface integrity can be maintained by setting the composite in a layering technique and using liners. Objective The aim of this in vitro study was to verify the effect of resin-modified glass-ionomer cement (RMGIC) lining and composite layering technique on the bond strength of the dentin/resin adhesive interface of lateral walls of occlusal restorations. Material and Methods Occlusal cavities were prepared in 52 extracted sound human molars, randomly assigned into 4 groups: Group 2H (control) – no lining + two horizontal layers; Group 4O: no lining + four oblique layers; Group V-2H: RMGIC lining (Vitrebond) + two horizontal layers; and Group V-4O: RMGIC lining (Vitrebond) + four oblique layers. Resin composite (Filtek Z250, 3M ESPE) was placed after application of an adhesive system (Adper™ Single Bond 2, 3M ESPE) dyed with a fluorescent reagent (Rhodamine B) to allow confocal microscopy analysis. The teeth were stored in deionized water at 37oC for 24 hours before being sectioned into 0.8 mm slices. One slice of each tooth was randomly selected for Confocal Laser Scanning Microscopy (CLSM) analysis. The other slices were sectioned into 0.8 mm x 0.8 mm sticks to microtensile bond strength test (MPa). Data were analyzed by two-way ANOVA and Fisher's test. Results There was no statistical difference on bond strength among groups (p>0.05). CLSM analysis showed no significant statistical difference regarding the presence of gap at the interface dentin/resin among groups. Conclusions RMGIC lining and composite layering techniques showed no effect on the microtensile bond strength and gap formation at the adhesive interface of lateral walls of high C-factor occlusal restorations

ВИЗНАЧЕННЯ НАЙБІЛЬШ ЕФЕКТИВНИХ ТЯГОВИХ ДЖЕРЕЛ СТРУМУ ДЛЯ ЕЛЕКТРОМОБІЛІВ

The analysis of the modern energy storage devices is carried out. It is established that when choosing a traction battery for an electric vehicle, it is necessary to determine the priority of characteristics by which the choice will be made, the operating conditions and what kind of consumer it is intended for. It has been determined that for urban public electric transport, the ultra capacitors should be used as the traction batteries, and for a small city electric vehicle the lithium-ion batteries are preferredПроведен анализ современных накопителей энергии. Определено, что для городского общественного электротранспорта в качестве тяговой аккумуляторной батареи эффективнее использовать ультраконденсаторы, а для малолитражного городского электромобиля – литий-ионные аккумуляторыПроведено аналіз сучасних накопичувачів енергії. Визначено, що для міського громадського електротранспорту як тягову акумуляторну батарею ефективніше використовувати ультраконденсатори, а для малолітражного міського електромобіля – літій-іонні акумулятор