Quantitative risk assessment and safety databases in Romanian coal mining: preliminary systematic approach

Risk management is becoming increasingly more complex. Risk assessment, approached quantitatively, requires a factual database to define the likelihood of adverse health effects of workplace-related injuries and exposures, and it attempts to balance scientific knowledge with concerns of staff, investigators and administration. Practical guidance should be provided for Romanian coal mining companies to make progress in risk assessment process. Guidance is given on how to effectively introduce quantitative risk assessment in mining industry, the main goal being to highlight that the most valuable resource remains experience gained by effectively performing the process. Analyzing how various parameters are described/used, the paper aims to establish the place and role of quantitative risk analysis mining. Possibilities of developing safety/reliability database in coal mining are investigated. The block diagram describing the conceptual structure of a database on failures, safety of equipment and workers in the mining industry was developed. Because mining relies heavily on complex technologies - permanent mining facilities and large mobile equipment and support services - often located in isolated and hostile environments, the implementation of quantitative risk analysis and the development of a realistic database could be considered as a resilience business strategy and conversion of available knowledge into management actions.

PSII-B-23 Implementation of a design thinking approach to problem-based learning in an animal science capstone

The objective is to present a strategy for attainment of capstone course objectives using design thinking. Problem based learning has long been incorporated into STEM, and yet inclusion of a formalized design thinking strategy is a novel approach for student-led cooperative learning. Relevancy of content and potential student impact upon the industry was established via the inclusion of stakeholders representing state livestock commodity groups who, via Zoom, met with students to present an overview of challenges facing their respective industries. Students, working in teams, used these conversations to formulate complex problems as the basis of their design thinking process. Subsequent steps of convergent and divergent thinking and low and high-fidelity prototyping led to creation of prototype solutions, which were continuously revised based upon feedback received after deployment. Solutions were prepared for dissemination to varied audiences using multiple communication strategies. Students were required to develop a technical report, scientific poster, infographic, narrated video, and oral presentation. The necessary buy-in from instructors, guest lecturers, students, and stakeholders is significant and a potential challenge to be addressed from the onset of the course. Further, use of design thinking typically requires students to transition from traditional course delivery and assessments to real world situations in which they receive process guidance, but must develop problem solutions themselves. Students required both prompting and restraint to follow the design thinking process. Frequent and transparent communication are helpful in ameliorating student frustration. The student group dynamic was heavily influenced due to covid-19, as teams contained a mix of students physically attending classes and those working remotely. Preliminary feedback suggests that all students engaging remotely via a Zoom meeting helps to create a more equitable and productive working environment. In its first iteration, students are engaged in design thinking and achieving capstone course objectives on schedule.

Design and Fabrication of Sodium Alginate/Carboxymethyl Cellulose Sodium Blend Hydrogel for Artificial Skin

Tissue-engineered skin grafts have long been considered to be the most effective treatment for large skin defects. Especially with the advent of 3D printing technology, the manufacture of artificial skin scaffold with complex shape and structure is becoming more convenient. However, the matrix material used as the bio-ink for 3D printing artificial skin is still a challenge. To address this issue, sodium alginate (SA)/carboxymethyl cellulose (CMC-Na) blend hydrogel was proposed to be the bio-ink for artificial skin fabrication, and SA/CMC-Na (SC) composite hydrogels at different compositions were investigated in terms of morphology, thermal properties, mechanical properties, and biological properties, so as to screen out the optimal composition ratio of SC for 3D printing artificial skin. Moreover, the designed SC composite hydrogel skin membranes were used for rabbit wound defeat repairing to evaluate the repair effect. Results show that SC4:1 blend hydrogel possesses the best mechanical properties, good moisturizing ability, proper degradation rate, and good biocompatibility, which is most suitable for 3D printing artificial skin. This research provides a process guidance for the design and fabrication of SA/CMC-Na composite artificial skin.

Sistem Pendukung Keputusan Penentuan Dosen Terfavorit Pilihan Mahasiswa Menggunakan Metode Simple Additive Weighting (SAW)

Lecturers are academic staff who are in charge of planning and implementing the learning process, guidance and training, and are able to bring students into activities held by the University, both official and non-official. Selection of favorite lecturers chosen by students can encourage lecturers to communicate more with students to be able to invite students to take part in groups or organizations involving students and lecturers. However, in reality, Universitas Putra Indonesia YPTK Padang is still not actively conducting this election. To overcome these problems, a Decision Support System was designed to determine the student's favorite lecturers by using the simple additive weighting method. The Decision Support System for Determining Favorite Lecturers of Student Choice is a system that is able to increase the ease of decision making in determining lecturers who have student attractiveness so that students are more active and more competent in the guidance of the selected lecturers. In this system the lecturer's assessment is based on 5 criteria. The criteria used are responsibility, discipline, attitude, initiative, and presence. To get the final conclusion as an alternative decision to determine the lecturer of this choice requires the calculation process stage on each variable that has been determined based on the criteria. The position of the decision support system in this study is as a decision supporter, not replacing the role of the decision maker, so that the decision maker has the right to fully refer to the decision support system or not. The research results from the calculated simple additive weighting method can be concluded that the favorite lecturer of the student's choice is lecturer 2 with a score of 1.00 which is the result of the highest ranking and can be used as an alternative for determining the favorite lecturer of the student's choice.

Research on Ultimate Thinning Rate of Superalloy Spinning

Spinning forming is an effective method for processing thin-walled rotating body parts. The influence of process parameters on the spinning forming limit of materials was studied for the four high-temperature alloys of GH3044, GH3625, GH3536 and GH4169 used in aero-engines. The results can be used as aero-engine high-temperature alloy parts spinning process and provides experimental basis and process guidance. The research results showed that the forming temperature had a significant effect on the spinning forming performance of superalloy materials. When the temperature increased to 800°C and above, the ultimate thinning rate raised 70%. The ultimate thinning rate of GH4169 was higher than the other three materials and GH3044 and GH3536 was at the middle level, GH3625 was relatively low. At the same time, the feed ratio and the corner radius of the rotary wheel had a certain influence on the ultimate thinning rate of different superalloys. The spinning process needs to select reasonable process parameters according to the actual situation when the spinning is applied to manufacture parts.

Kontribusi Manajemen Peserta Didik terhadap Pendidikan Seksual

So far, education experts have contributed a lot of thoughts on tips on child sexual education, but the operation of the education process is only through informal education, which is only in the family environment. This study seeks to present the flow of the sexual education process of children at the school level as an integral part of the learning process. This study discusses the contribution of student management to sexual education of children in schools. This study uses library research methods and uses documentation study as a data collection technique. The results revealed that the process of implementing sexual education in students can be carried out in three stages of activities, namely the stages of admitting new students, the learning process, guidance and monitoring. The first stage is through managing new student orientation activities which are divided into male and female groups, new students are accustomed not to mingle with the opposite sex. This activity should also be used by the school to socialize school rules that contain sexual education values. The second stage, management of the learning process in the form of managing student groupings based on gender (gender grouping); determining the learning method through the expository method, discussion method, exemplary method, and habituation method; as well as managing learning programs by incorporating sexual education values ??into formal subjects such as Biology, Sociology, Morals, and Fiqh. The next stage is to carry out structured guidance related to sexual education coaching under the supervision of guidance and counseling teachers. The final stage in the series of sexual education processes in schools is monitoring activities that involve all stakeholders in the school environment such as the principal, vice principal in student affairs, homeroom teachers, subject teachers, guidance and counseling teachers and even parents.

Fast guidance method of lunar landing based on dynamic programming

In this paper, a novel multi-stage trajectory transfer and fixed-point landing time optimal guidance method for the lunar surface emergency rescue mission is proposed. Firstly, the whole process motion and dynamics model for the lunar surface emergency rescue with four stages are established. Then, in the initial orbit transfer phase, the Lambert algorithm based on "prediction + correction" is designed for the non spherical gravitational perturbation of the moon. In the powered descent phase, the Hamiltonian function is used to design a time suboptimal explicit guidance law that can be applied in orbit in real time. Finally, aiming at the multi-stage global time optimal guidance, the whole time process guidance law is obtained by establishing the allowable control set for each stage in the whole process. The simulation results show that compared with the piecewise optimal control method, the present method has better optimization effect and shorter whole process time. It is of great significance to the possible emergency rescue mission of manned lunar exploration in the future.

Optimization of process parameters for surface roughness and tool wear in milling TC17 alloy using Taguchi with grey relational analysis

To improve machining quality and processing efficiency, the Taguchi analysis method is employed to design the milling tests of titanium alloy TC17. According to results based on the signal-to-noise ratio method, the cutting depth plays a critical role in improving the surface roughness and tool wear. The grey correlation analysis is a multi-objective optimization method that can help to acquire process parameters combination of the optimal surface roughness and the optimal tool wear. Finally, the correctness of multi-objective optimization results is verified through comparison experiments. The research results can provide process guidance and data reference for the actual production processing.

A Materials Bank for Circular Leuven: How to Monitor ‘Messy’ Circular City Transition Projects

In recent years, cities have revealed themselves as being prominent actors in the circular economy transition. Besides supporting and initiating urban projects catalyzing circularity, cities are looking for monitoring tools that can make their progress towards circularity visible. Adopting Leuven’s pilot project for a building materials bank as a case study, this paper notes the particular challenges and opportunities in the pilot project to assess its progress and impact, in combination with gathering data for overall circular city monitoring purposes. Firstly, the paper names tensions between the “messy” transition process from policy ambitions to implementation and the question of data and monitoring. Secondly, the paper identifies relevant dimensions and scales to evaluate progress and impacts of a building materials bank, drawing from its development process. Thirdly, it proposes guidelines to monitor and evaluate circular city projects from the bottom up, combining quantitative indicators with guiding questions in a developmental evaluation. The analysis serves a critical reflection, distills lessons learned for projects contributing to circular cities and feeds a few concluding policy recommendations. The case study serves as an example that, in order to move beyond the tensions between circularity monitoring and actual circular city project development, monitoring instruments should simultaneously interact with and feed the circularity transition process. Therefore, dedicated data governance driven by enhanced stakeholder interactions should be inscribed in transition process guidance. Bottom-up projects such as a building materials bank provide opportunities to do this.