Optimal coordination of energy sources for microgrid incorporating concepts of locational marginal pricing and energy storage

This research aims to coordinate energy sources for standalone microgrid (MG), incorporating locational marginal pricing (LMP) and energy storage. Two approaches are suggested for the optimal energy management of MG. First, the energy management of a standalone MG is performed utilising the concept of LMP. The objective is to minimise the average LMP to reduce network congestion and power loss costs. Second, energy management is performed using a dual-stage energy management approach. A BESS model is formulated considering charging and discharging characteristics and utilised in this research for dual-stage energy management. The impact of the battery state of charge (SOC) is assessed in the optimal day-ahead operation. An incremental cost factor is included with battery SOC when calculating the system operating cost. A new binary jellyfish search algorithm (BJSA) is developed to solve energy management problems. The suggested BJSA technique is implemented in solving the optimal energy management of MG considering LMP. The simulations of the suggested approach are conducted on the IEEE 14 and 30-bus test systems. Results show that the BJSA technique is more consistent than the binary particle swarm optimisation (BPSO) technique in determining the optimal solution. In addition, the BJSA technique is employed to solve the dual-stage energy management of MG considering BESS. The proposed approach is simulated on the IEEE 14 and 30-bus systems. Results also show that the BJSA technique is superior to the BPSO technique in minimising the operating cost in real-time economic dispatch (ED). The performance of the BJSA and BPSO techniques is exactly similar to the UC schedule with and without BESS considering the IEEE 30-bus system, like the IEEE 14-bus system. The BJSA technique minimises operating costs by up to 5% over the BPSO technique for the UC schedule with power loss. Operating costs are reduced by up to 5% using the BJSA technique rather than the BPSO technique for real-time ED with BESS. However, the BPSO technique is inconsistent and fails to obtain the same results for the IEEE 30-bus system. Overall, the findings confirm the superiority of the suggested BJSA technique and the suggested optimisation approaches in optimising the energy management of MG

A Comparative Study of Job Satisfaction in Banking (A Case Study of Public and Private Bank Sectors)

In this study we show the comparative study of job satisfaction in Public and Private Bank sectors. This paper will investigate as to what extent job satisfaction has lead to good working performance in formal organization. The study will examine the factors which influence employee’s job satisfaction in organization such as Job involvement, Organizational commitment, Quality of work life, organizational climate and Job content. This study also represent that the Private bank officers have higher levels of job satisfaction than those from public sectors as they enjoy better facilities and supportive work environment. In order to study the objective primary data were collected with a sample size of 400 which was collected at randomly from 10 equally selected public and private Banks. Finally an attempt has been made to regression and correlation analysis on job satisfaction and variables among the public and private bank employees in Bangladesh. Key words: job satisfaction, banking sectors, contributing variables, Performance analysis.

Impact of Covid-19 Pandemic on Top Tourist Destinations in the World

COVID-19, a variant of novel corona virus, spread all over the world in eight to nine months. Almost all business sector of the world is affected by this global pandemic. Tourism industry is not a single industry, but it is connected with many other industries directly or indirectly. For example, the transportation systems airlines, bus, train, cruise ships and accommodation facilities like hotel, motel, home stay and other tourism service provider like travel agency or tour operator all of these are connected with this industry. Thousands of flights are cancelled, luxurious hotels are empty, no business for tour operator and travel agencies, people involved with tourism industry are losing jobs or not getting salaries fully.  The COVID-19 situation has paused all of these sectors’ businesses. The purpose of this study is to show the impact of covid-19 in the most popular tourist destinations in the world and provide some recommendations to overcome the crisis. Qualitative in manner, the research paper used secondary method of data from website materials, newspapers, organizational statistics on COVID-19 occurrences all over the popular tourist destinations in the world. This review illustrates a concrete overview about the impact of COVID-19 in popular destinations and provides some recommendations further to overcome it. This paper may guide further research in quantitative method. Keywords: COVID-19, Tourism destinations, Economy, Tourism Industry DOI: 10.7176/JTHS/50-07 Publication date:September 30th 202

Investigation for a suitable screw of a briquetting machine

[Abstract]: Briquetting is a well-established technology. But its crucial part is the screw wear, which has a great influence on the cost of production. The aim of this study is to look for the suitable parameters of screw, which can make this technology attractive to the people. With this objective, the study of existing Bangladeshi screw and a few newly designed screws has been done. Four different types of new screw have been constructed, the design and idea of which are taken from the experience of the Institute of Energy in Vietnam. The remarkable features of the screw are that it is short in length and the thread is not made as an integral part of the base of screw. Different types of pitch and height of screw have been used for this stud

Radiolyse de l'eau induite par les ions de recul de la réaction nucléaire 10B(n,α)7Li : calcul des rendements des espèces primaires jusqu'à 350 °C et génération in situ de pics d’acidité ultra-rapides transitoires le long des trajectoires de rayonnement

Abstract: The 10B(n,α)7Li nuclear reaction is very important for the nuclear industry as well as in radiobiology, as boron neutron capture therapy (BNCT) is used in biochemically targeted radiotherapies for several malignant cancer treatments. Boric acid enriched with 10B is used in nuclear reactors to control the neutron flux and the reactivity in the core. However, recoil nuclei (1.47 MeV α-particles and 0.84 MeV 7Li3+ ions) resulting from this reaction act as sources of high linear energy transfer (LET) radiation, thereby complicating the radiolytic processes inside the reactor. Monte Carlo simulations are used to predict the yields (G-values) of the radicals and molecular products due to the radiolysis of water by the 10B(n,α)7Li recoil ions as a function of temperature from 25 to 350 °C. Our computed yields show lower yields of free radicals and higher yields of molecular products in comparison with low-LET radiation (60Co γ-rays). Our simulation results agree well with existing experimental estimates at 20 and 289 °C. However, the non-monotonic downward inflection of the yields of molecular H2 and H2O2 above ~150 °C can be confirmed if we could get the rate constant of the (e−aq + e−aq) reaction measured under neutral or slightly acidic conditions. Moreover, in this study, we also calculated the in situ concentrations of H3O+ and the corresponding pH values along the radiation tracks using a “cylindrical track model” characteristic of high-LET radiation. For both considered recoil ions, the pH along the tracks is near zero up to ~100 ps, after which it progressively returns to neutrality at ~0.1 ms. However, in cellular water, this “acid spike” retains for a longer period of time due to the slower diffusion of free protons in this medium, a result that may have several implications in BNCT and, more generally, in the overall field of hadrontherapy.La réaction nucléaire 10B(n,α)7Li de capture de neutrons par le bore est très importante pour l'industrie nucléaire ainsi que pour la radiobiologie, car la thérapie par capture neutronique par le bore est utilisée dans des radiothérapies biochimiques ciblées pour plusieurs traitements anticancéreux. L'acide borique enrichi en 10B est utilisé dans les réacteurs nucléaires pour contrôler le flux de neutrons et la réactivité dans le cœur. Cependant, les noyaux de recul (particules α de 1,47 MeV et ions 7Li3+ de 0,84 MeV) résultant de la réaction 10B(n,α)7Li agissent comme sources de rayonnement à transfert d'énergie linéaire élevé (TEL) compliquant ainsi le processus radiolytique à l'intérieur du réacteur. La simulation Monte-Carlo est utilisée dans ce travail pour prédire les rendements (valeurs G) des radicaux et des produits moléculaires dus à la radiolyse de l'eau par la réaction 10B(n,α)7Li en fonction de la température de 25 à 350 °C. Nos calculs montrent des rendements plus bas en radicaux libres et plus élevés en produits moléculaires en comparaison avec un rayonnement de faible TEL (e.g., rayons γ de 60Co). Les résultats de nos simulations concordent bien avec les estimations expérimentales existantes à 20 et 289 °C. Cependant, l'inflexion prédite par certains auteurs dans les rendements moléculaires H2 et H2O2 au-dessus de ~150 °C ne peut être confirmée dans la mesure où l’on adopte la constante de vitesse de la réaction (e−aq + e−aq) en solution neutre ou légèrement acide. De plus, dans cette étude, nous avons également calculé la concentration de H3O+ formé in situ le long des trajectoires du rayonnement en considérant un « modèle de trajectoire cylindrique » pour un rayonnement à fort TEL. Pour ces ions, le pH le long des trajectoires est proche de 0 jusqu'à ~100 ps, puis revient progressivement à un pH neutre (7) à ~0,1 ms. Cependant, dans l'eau cellulaire, le "pic d'acidité" demeure plus longtemps à cause de la faible mobilité du proton dans ce milieu, ce qui soulève plusieurs questions en relation avec la boroneutrothérapie et, plus généralement, l’hadronthérapie

Polymer based filler materials as infill for GFRP pile connector

Recently glass fibre reinforced polymer (GFRP) tubular piles have been developed for civil engineering applications instead of conventional concrete piles. Considering their suitable applications, the new polymer based filling materials are being developed at the University of Southern Queensland as a part of work done for timber pile rehabilitation. This ongoing project aims to replace portion of the deteriorated timber pile by using GFRP piles. Due to good compressive strength, pumpability and workability, the new polymer base materials are to be filled in between GFRP pile and existing timber pile base. An ongoing research program has been initiated to improve fundamental understanding of these materials and to provide the knowledge required for their broad utilization. In this development, sample trial mixes were considered based on several weight percentages of polymer resin, fly ash and sand. Material parameters such as compressive strength, stiffness, shrinkage and gel time were achieved from the experimental investigation. It has been found that most polymer based trial mixed fillers have high compressive strength and considerable plastic region with more than 10% strain. These results imply that the polymer based filling materials are suitable for both compression and tensile loading situations. However, the behaviour of fillers with GFRP pile connector under different loading conditions is yet to be fully understood

Fibre composites for high pressure pipeline repairs, in-air and subsea: an overview

In 2001 it was reported that in North America alone, corrosion to the Oil & Gas pipeline distribution network cost approximately $2-3.3 billion per annum with 10% of that cost being associated with actual failure of the pipeline. In addition pipelines are also susceptible to erosion and mechanical damage producing further losses in pipe structural integrity. This results in high maintenance costs, possibility of adverse environmental consequences and the costly interruption to product transportation and distribution. The cost and technical challenges of adequately addressing repair are significant and greatly increase for underwater applications particularly with increasing water depth. It therefore induces the need of searching for alternative repair techniques involving new advanced materials for ease of installation and application against adverse environmental effects in the long run. Fibre composite materials provide excellent advantages over conventional metals in engineering practices for many decades. These advantages make fibre composite suitable candidate for effective repair technology. This paper provides a comprehensive review on the recent development and future prospect of using these materials for in-air and underwater pipeline external repairs. Various aspects of technical knowhow; benefits and shortcomings of the repair considerations are also presented

An investigation on the student performance in first year fundamental engineering course, Engineering Statics

This paper details a quantitative investigation performed on the student performances in Engineering Statics, a fundamental engineering course. It is one of the highly numerical subjects that students encounter during early stage of their engineering programs and students are expected to complete large numbers of practice problems in order to learn the relevant theories. Historically, the success rate of the students enrolled in this subject was significantly below the average. The major cause for the higher failure rates was attributed to the lack of fundamental knowledge in mathematics. However, this study is intended to investigate the progressive performances of the students who satisfied the entry requirement and enrolled in the subject. The assessment marks were analysed against two categories such as delivery mode and the gender of the students to understand the critical causes of the outcome. Few statistical analyses were performed, and the results are presented in this paper