Construction and safety aspects for the arrangement of mobile explosive deposits

The execution of the blasting works involves the management of the problem of storage of explosive materials. This aspect is easier to solve in the case of mines activities with long exploitation time and where storage capacities are arranged, according to the legislation that provides constructive and safety criteria depending on the type and quantity of explosive materials stored. In the case of isolated blasting works, those for road construction, building demolition, underwater or forestry, etc., storage facilities must be arranged for shorter periods of time and smaller capacity, but which must comply with security, environmental and risk requirements, such as high-capacity deposits with long duration of activity. Considering that for the execution of such blasting works, the national legislation provides the possibility of arranging temporary explosive depots, of small capacity, but without specifying the constructive details and the necessary safety requirements to be observed, mentioning only that they must be executed on the basis of a specialized project. This paper presents a series of tests conducted by INSEMEX, in order to establish recommendations regarding the constructive and safety requirements that must be observed when designing and building mobile explosive depots.

AUGER CONVEYOR-DISTRIBUTER OF GRAIN

The construction of a solar dryer-grain storage facilities is described. The design of a auger conveyor-distributor of grain for its loading is offered. The dependence of the width of the discharge opening in the casing of the auger conveyor-distributor on its length is obtained. The results of laboratory tests of the auger conveyor-distributor of grain are presented. It is established that the minimum initial width of the drain opening for wheat grain should be not less than 9 mm. The conditions of uniform distribution of grain by the auger conveyor-distributor are justified: the filling factor of the auger interturn space in its loading zone – 0.35; the length of the discharge opening of the charging hopper should be equal to the doubled value of the auger pitch size. In this case, the uneven distribution of grain along the discharge opening will be no more than 5%.

Evaluation of the Influencing Factors of Using Underground Space of Abandoned Coal Mines to Store Hydrogen Based on the Improved ANP Method

Storage is currently a major obstacle to the promotion of hydrogen energy. Hydrogen storage in abandoned coal mines can achieve the effective use of underground space while meeting the growing demand for energy storage facilities, which can bring economic and environmental benefits. However, research in this area has been limited to the conceptual discussion stage, without establishing a scientific evaluation method for the potential of modifying and utilizing abandoned coal mine space. In this study, based on the analytic network process (ANP), the Apriori algorithm is introduced to mine the association rules for various influencing factors. First, the Apriori algorithm is applied to mine association rules between indicators, eliminate unnecessary influence relationships, simplify the network structure model, and optimize the ANP weight calculation results; second, the solution method of judgment matrix is improved with triangular fuzzy numbers, and the index weight is solved by fuzzy nine marks instead of the method of nine scale, which is convenient for experts to give the fuzzy scale while better reflecting the opinions of experts. Finally, the ANP algorithm is applied to rank the weights of the obtained influencing factors, discuss the main factors with higher weights, and analyze the feasibility of converting candidate coal mines into hydrogen storage facilities using the derived evaluation method in the case study. The evaluation methods and conclusions presented in this study provide analytical tools and a decision basis for analyzing the feasibility of converting underground space of abandoned coal mines into hydrogen storage facilities and assessing the economic indicators.

Methodology for Determining the Thermal and Thermal-Stress States of a Concrete Storage Container for Spent Nuclear Fuel for Assessment of Its Service Life

The work is devoted to the development of methodologies for determining the thermal and thermal-stress states of the main equipment in dry container storage facilities for spent nuclear fuel. Storage facilities of this type are most common for spent fuel of nuclear power reactors. The safety of storage equipment in terms of assessing its service life is not covered widely enough in the world scientific literature. In particular, there are no effective methods for calculating the thermal and thermal-stress states of the equipment that would take into account the influence of many external factors throughout the life of a storage facility. To assess the thermal state of the containers, forward conjugate heat transfer problems, accounting for the mutual heat transfer in both a solid body and in the fluid environment (air), are proposed to be solved. Based on the solution of the conjugate heat transfer problems, the boundary conditions are to be determined to further assess the thermal-stress state of storage containers using inverse heat transfer problems. The proposed approach to determining the thermal and thermal-stress states of a concrete spent fuel container will promote more effective methods for assessing the service life of dry spent fuel storage facilities, which is, in turn, necessary in the development of ageing management programs for storage equipment and long-term safe operation.

Financial Analysis of Country Bean in Narsingdi District of Bangladesh

Aims: This study is an attempt to examine the profitability, problems and probable solutions of country bean production in Belabo upazila of Narsingdi district of Bangladesh. Study Design: Financial calculation of the cost and return were done to the evaluation process. Besides the problems and solutions of bean cultivation were also analyzed. Place and Duration of Study: This study was conducted in Belabo upazila of Narsingdi district of Bangladesh from November 2019 to April 2020. Methodology: A convenience sampling technique was selected to meet the objectives. One hundred and twenty five country bean growers were chosen from the study area. An interview schedule was prepared for collecting necessary data from the participants. The schedule contained questions about the socioeconomic characteristics of farmers, different costs associated with production, different problems faced by them during production and their probable suggestions to overcome those problems. Standard financial techniques were used to evaluate costs and returns. Descriptive statistics were used to describe socio-demographic characteristics, farming information, problems during the production process and rank of suggestions. Results: The study found that the total cost of bean cultivation was found in Bangladeshi Taka (BDT) 163866.35 per ha, net return was BDT 60850.28 per ha and benefit cost ratio was 1.37. The study found low price, lack of scientific knowledge in farming, transportation problems and poor storage facilities as major constraints. Besides, the farmers mentioned that they need proper training, reduction in price risk, credit support, cold storage facilities and transportation facilities. Conclusion: The study showed that per hectare yield, gross returns, gross margin, net return and benefit cost ratio of bean were higher. Therefore, bean production is highly profitable and it would help to improve the socio-economic condition of farmers in Narsingdi district. Besides, the study identified several problems faced by the bean growers and possible solutions to overcome those constraints were proposed.

Combining research and design: A mixed methods approach aimed at understanding and optimising inpatient medication storage systems

Background Almost every patient admitted to hospital will receive medication during their stay. Medication errors are an important cause of patient morbidity and mortality, as well as an economic burden for healthcare institutions. Research suggests that current methods of storing medication on hospital wards are not fit for purpose, contributing to inefficiency and error. Aim To improve medication storage in inpatient areas, by exploring variation and challenges related to medication storage and designing a prototype solution. Methods Set in four hospitals in an English teaching hospital trust, the study used a mixed methods approach comprising a quantitative descriptive survey of storage facilities and practices followed by mixed methods observations of medication rounds and interviews with patients, nurses and pharmacy staff. Quantitative data were presented descriptively and qualitative data analysed thematically and using a human-centered design approach. Results We identified wide variation in medication storage facilities and practices across 77 wards. Observations and staff interviews in six wards revealed five problem areas: poor management of multiple storage facilities; lack of visibility and organisation of medication within trolleys; inadequate size of storage; lack of ownership and knowledge of standard practice; and use of key locks. Patients were largely satisfied with receiving their medication. Systematic and consistent physical organisation of medication in medication trolleys, and integrating and implementing principles of best practice, were identified as areas for intervention. Discussion and conclusion Variation in medication storage facilities and practices existed both across the organization and on individual wards. Multiple challenges were identified in how medication was stored, which if addressed may improve the efficiency and safety of medication administration and in turn, staff and patient experience. The use of design principles alongside a research approach resulted in a rapid, iterative process for developing and refining potential solutions to improve inpatient medication storage.

Advances in Distributed Generation Source Digital Twins Design

The emerging power systems will be proliferated by different distributed generation sources and storage facilities. The adequate modeling of these novel facilities, and power systems in general, is of fundamental importance for the evolution of power systems since the appropriate models are the only tool that can feasibly be used to investigate such diverse and complex multi-domain structures. In other words, the development of digital twins of the distributed generation sources presents a prerequisite for advancements in several domains (technical, financial, social, ecological, etc.). This paper explains several modeling approaches and provides examples of how the models could be used.