ESPDS

In this paper, we introduce a Microsoft Excel Workbook containing the software Equipment Selection Problem DS (ESPDS) that recognizes the special structure of the equipment selection problem. The ESPDS approach is based on the context of the Brazilian forestry sector using detailed equipment maintenance schedules. No special restrictions are needed on cost inputs over time or technologies. The output is an equipment schedule that can be used to project equipment investment needs, operational costs, and tree harvesting costs. ESPDS can be applied to support companies and contractors in order to choose the best option for their operations, as well as to achieve better equipment purchase agreements. We will show how ESPDS will also be useful in providing longer term estimates of production costs. The sensitivity analysis shows how different inputs and maintenance polices can affect the best alternative. A numerical example is included considering the entrance of a specific technology that increases the equipment productivity in order to examine whether it can change the solution. ESPDS is intuitive, flexible, and easy to calculate. Although designed for the forestry industry, the approach is readily transferable to other sectors. ESPDS may be found on the web at the following URL: <a target="_blank" rel="nofollow" href="https://www.researchgate.net/publication/350811380_ESPDS_workbook">https://www.researchgate.net/publication/350811380_ESPDS_workbook</a>.

Peningkatan Mutu Produk Jamu Home Industry pada Kelompok Jamu Gendong Desa Karangrejo Kabupaten Magetan di Masa Pandemi Covid-19

The purpose of this community service activity is to improve the quality of jamu gendong products at the home industry of jamu gendong in Karangrejo village, Magetan Regency. The method of service is carried out by training, including procedures for pre-survey activities, surveys, socialization, training, and evaluation. The target of the service activity is the women of the jamu gendong group. The evaluation results showed an increase in participant understanding of 56% about the technique of selecting rhizomes for herbal medicine, an increase in participant understanding of 44% about equipment selection techniques for herbal medicine, an increase in participant understanding of 72% about the hygienic process of making herbal medicine, an increase in participant understanding of 66% about the hygienic packaging process of herbal medicine. The results of monitoring and evaluation showed that 100% of participants were satisfied in participating in the activities, 100% of participants took an active role in participating in the training, 100% of participants were enthusiastic in participating in the activities.

Stability Analysis of Paste Filling Roof by Cut and Fill Mining

Ensuring the stability of paste false rooves is an important issue in the study of the process of paste filling and slicing mining. Here, a mechanical model of a paste false roof is created to analyze its stability in the process of lower slicing mining in order to determine the minimum slicing thickness of the false roof. We use FLAC3D to simulate and analyze the influence of changes in paste false roof thickness on the stability of the roof. The quantitative functional relationship between the thickness and the subsidence of a false roof, and the optimal thickness of the artificial paste roof, is finally obtained by the development law of the plastic zone in the lower slicing face. The results show that when the thickness of the paste false roof is 3.2 m, the roof can maintain its self-stabilization state and ensure the normal mining of lower layers. Because the same thickness of the upper and lower layers is beneficial for mining replacement and equipment selection in different layered working faces, the optimal thickness of a paste false roof is determined to be 3.2 m.

Equipment selection criteria for increasing the durability of printed circuit boards of on-board radio telemetry systems

Рассматривается критерий задачи корректного выбора типа оборудования для устранения причин возникновения соответствующих видов дефектов многослойных печатных плат бортовых радиотелеметрических систем на этапе производства. Ограничением является объем выделяемых на это средств. The criterion of the problem of the correct choice of the type of equipment to eliminate the causes of the corresponding types of defects of multilayer printed circuit boards of on-board radio telemetry systems at the production stage is considered. The limit is the amount of funds allocated for this purpose.

Fast, Environmentally Sound and Efficient Well Clean-Up Operations: Lessons Learned and Best Practices from Operations Around the World

Well clean-up is one of the most complex operations performed at the wellsite today. During clean-up, a well is flowing for the first time after initial completion or workover operations through temporary surface facilities to either conduct a welltest or to simply condition the well before connecting it to production facilities. Currently, there are no practical recommendations available that would summarize clean-up experiences and guide operating companies through the process of efficiently planning well clean-up operations. Conventional well clean-up operations are inherently challenging owing to the requirements for accurate data measurements, safe handling and disposal of produced fluids (hydrocarbons, completion brine, water, and solids). Experience has shown that it is nearly impossible to perform well clean up within pre-defined constraints and target criteria without an appropriate design, equipment selection and operations planning to account for the specificities of each situation. Steady-state flow simulators have been the standard tool to model pressure and temperature changes along the wellbore and through temporary production system during well clean-up process. Those assume either final stabilized conditions or a limited number of intermediate ones and formed the basis for equipment selection. But this approach has critical limitations in modelling flowing well behavior and fast-changing flowing conditions, and therefore in assessing operational flow assurance risks and the dynamic capability of the surface plant to handle produced fluids. The paper describes in detail today's challenges during well clean-up operations that combine the need for operational safety, minimal environmental footprint and flow assurance considerations that have to be balanced with costs and production performance optimization. The paper provides practical recommendations and presents multiple case studies highlighting the results and lessons learned from applying a novel, unique workflow based on the application of a transient-multiphase flow simulator. Combined with modern well-testing equipment such as modern test separators, remotely actuated adjustable chokes or environmentally friendly fluid disposal techniques, such advanced design allows performing clean-up operations efficiently while remaining within time, rates, pressure or emissions limits.