Good Handling Research Articles

IMPLEMENTATION OF POLICY FOR HANDLING OF HAZARDOUS GOODS IN THE EFFORT TO ACHIEVE THE SAFETY AND SECURITY OF RO-RO SHIPS IN TANJUNG SILVER UTAMA KESYAHBANDARAN

North Jamrud Terminal, Tanjung Perak Port, Surabaya, has an operating function to accommodate passengers who will carry out embarkation/debarkation activities and coordinate vehicles that will get on or off the ship. Some of the areas that are the destination and origin of shipping services at the Gapura Surya Nusantara Passenger Terminal include Banjarmasin, Makasar, Maumere, Batulicin, Tanjung Priok, Benoa, Sampit, Kumai, Balikpapan, Waingapu, Sorong, Manokwari, Ende and several other cities.
 The purpose of this study is to describe and analyze the implementation of the Pilot Assessment and Vessel Verification Policy as a Guiding Assistance Facility at the Tanjung Perak Surabaya Main Harbormaster Office to the supporting and supporting factors.,
 This qualitative research explores Policy, Handling of Dangerous Goods, Safety and Security of RO-RO (Roll On-Roll Off) Ships using Van Mater and Van Horn's theory of policy implementation. Collecting data in this study using interviews, documentation and observation. The results obtained are then collected, reduced, presented and conclusions drawn.
 The results obtained are RO-RO (Roll On Roll Off) Ship Transportation is very much needed by all people in various parts of Indonesia, but in its operation there are still many obstacles that must be aware of. Starting from the results of the investigation by the KNKT (National Committee for Transportation Safety) the RO-RO (Roll On-Roll Off) ship accident caught fire from the Tanjung Perak Port, Surabaya in the middle of the sea, from 2011 to 2019 as many as 5 ships indicated that they came from loaded trucks contained cargo of dangerous goods. Due to weak supervision of cargo of dangerous goods due to inadequate facilities and infrastructure, namely not having an early detection device (Xray), making it difficult for officers. Regarding the problem of the policy of handling dangerous goods cargo at the Tanjung Perak Main Harbor, it seems that it is not fully implemented, so that if it refers to the Van Metter and Van Horn theories, that the current conditions are policies for handling dangerous goods cargoes in an effort to realize the safety and security of RO-Ships. RO (Roll On-Roll Off) has not been fulfilled properly.
 Keywords: Policy, Handling, Cargo, Goods, Dangerous.

ЗАСТОСУВАННЯ ЛОГІСТИЧНИХ МЕТОДІВ ДЛЯ ВПРОВАДЖЕННЯ CROSS-DOCKING ТЕХНОЛОГІЇ В ТРАНСПОРТНО-СКЛАДСЬКІЙ СИСТЕМІ

Abstract Introduction. The efficiency of logistics operations, the speed of processing of goods largely depend on how all parts of the logistics chain interact, how optimized business processes in the warehouse, so any company tries to constantly improve the organization of the supply process so as to deliver in the shortest possible time. term for minimum logistics costs. One of the tasks to solve the problem of supply chain imperfections is to reduce the huge number of warehousing operations during the placement of goods for long-term or short-term storage. This can be done with the help of Cross-Docking technology, which eliminates the storage phase and reduces warehousing costs. Problem statement. Today, Cross-Docking technology is mobile, technologically proven, because it is a very advanced method of processing goods. However, in order to successfully implement this technology, it is necessary to understand the concept of Cross - Docking, knowledge of the features, benefits, conditions and limitations for the implementation of this technology. That is why the question of determining the list of goods for which the introduction of this Cross - Docking technology is expedient and rational is becoming relevant. Purpose. To substantiate the definition of the list of goods for which the introduction of Cross-Docking technology is expedient and rational, using the coefficient of variation and making recommendations for their processing and methods of handling - by grouping by logistic method XYZ analysis. Methods. The XYZ analysis method was used during the work. Results. The study justified the use of the coefficient of variation to identify goods for which it is appropriate and rational to implement Cross-Docking technology, and the use of logistics method - XYZ analysis - to develop recommendations for processing and handling of certain goods. Conclusions. Based on research based on theoretical and applied aspects, the development and implementation of Cross - Docking technology is an element that simplifies business logistics and reduces the cost of its products by reducing warehouse costs, and properly organized process speeds up delivery, allows businesses to send perishable products over long distances and organize turnover even in high season. The proposed logistic method of differentiation by HYZ analysis allows to clearly identify those products that are characterized by maximum demand, high turnover, stable predictability, mass consumption, ie those products for which the recommendation is to minimize their number in warehouses, respectively - the feasibility and rationality of Cross technology - Docking. Key words: supply chain, Cross - Docking technology, one - stage Cross - Docking, two - stage Cross - Docking, XYZ - analysis, coefficient of variation, methods of grouping in XYZ - analysis, XYZ - analysis solutions.

Enhanced bone regeneration by Aloe vera gel conjugated barnacle cement protein composite hyaluronic acid hydrogel based hydroxyapatite derived from cuttlefish bone

Injectable Aloe vera gel W (AGW®)-conjugated Barnacle Cement Protein (BCP) composite Hyaluronic Acid (HA) hydrogels provide local periodontal tissue for bone filling in periodontal surgery. We developed a novel type of injectable self-supported hydrogel (2 mg/ml of AGW®-BCP/HA) based cuttlefish bone derived hydroxyapatite (CBH) for dental graft, which could good handling property, biodegradation or biocompatibility with the hydrogel disassembly and provided efficient cell adhesion activity and no inflammatory responses. Herein, the aim of this work was to evaluate bone formation following implantation of CBH and collagen membrane in rabbit calvarias defects. Eight male New Zealand rabbits were used and four circular calvarias defects were created on each animal. Defects were filled with different graft materials: 1) collagen membrane, 2) collagen membrane with CBH, 3) collagen membrane with bovine bone hydroxyapatite (BBH), and 4) control. The animals were sacrificed after 2 and 8 weeks of healing periods for histologic analysis. Both sites receiving CBH and BBH showed statistically increased augmented volume and new bone formation (p<0.05). However, there was no statistical difference in new bone formation between the CBH, BBH and collagen membrane group at all healing periods. Within the limits of this study, collagen membrane with CBH was an effective material for bone formation and space maintaining in rabbit calvarias defects.

Long-Term Biocompatibility of a Highly Viscously Thiol-Modified Cross-Linked Hyaluronate as a Novel Vitreous Body Substitute.

Purpose: In surgical ophthalmology, the treatment of complicated retinal and vitreous diseases is one of the central challenges. For this purpose, the vitreous body is removed as part of the standard therapy and replaced by a temporary tamponade to stabilize the position of the retina. Since the tamponading properties of previous materials such as silicone oils, gases, or semi-fluorinated alkanes are a combination of their surface tension and their buoyancy vector, they cannot completely fill the vitreous cavity. The aim of this work was to test in vivo a novel vitreous body substitute (ViBos strong) based on cross-linked hyaluronic acid for its compatibility. Methods: A pars plana vitrectomy with posterior vitreous detachment was performed in the right eye of 18 pigmented rabbits, with subsequent injection of ViBos strong. Follow-up examination included slit-lamp examination, funduscopy, intraocular pressure measurements (IOP), optical coherence tomography (OCT), and electroretinogram (ERG) measurements. The rabbits were sacrificed at three different time points (1, 3, and 6 months; each 6 animals) and examined macroscopically and prepared for histological examination (HE staining) and immunohistochemistry (Brn3a and glial fibrillary acidic protein (GFAP)). Results: ViBos strong demonstrated good intraoperative handling and remained stable for at least 1 month and degraded slowly over 6 months. IOP was within clinical acceptable values at all follow-up examinations. Retinal function was well preserved after instillation of the hydrogel and comparable to the untreated eye after 6 months in OCT, ERG, and histological examinations. An increase in the GFAP expression was found in the surgery eyes, with a peak in the 3-month group. The Brn3a expression was not significantly affected by vitrectomy with ViBos strong. Conclusion: Highly viscously thiol-modified cross-linked hyaluronate showed a good biocompatibility in rabbit eyes over 6 months after vitrectomy, making it a promising potential as a vitreous substitute.

Event-Triggered Sensor Fault Estimation of Unreliable Networked Unmanned Surface Vehicle System With Correlated Noises

The problem of sensor fault estimation has been studied for Unmanned Surface Vehicle (USV) systems in networked environment. Assuming that the process noise is related to the measurement noise and packet loss will occur during the measurement transmission. We use an event-trigger mechanism (ETM) to save communication resources. Accordingly, an observer is proposed to estimate the state and sensor fault, and the trigger threshold is associated with the correlation coefficient. By adjusting the threshold, the observer performance and energy consumption can be balanced in an ideal situation. The observer designed in this paper reduces the effects of correlation noises effectively and good handling network packet losses, and it has been proved that the expected covariance of the estimation error is bounded. Finally, the simulation experiment on the identified model of USV in the laboratory is performed to validate the relevant conclusions.

PENGGUNAAN TELEHEALTH DALAM PELAYANAN KEPERAWATAN KEPADA ORANG DENGAN HIV- AIDS/ ODHIV: TELAAH JURNAL

Introductions: People living with HIV/AIDS/PLWH is increasing every year. This phenomenon requires good handling so that the number does not increase and get out of control. Telehealth is information technology in health and nursing services for people living with HIV. Objective: This study aims to examine the use o/f telehealth applications in health services to people with HIV/AIDS. Methods: The literature review used in this study utilizes online databases: Scopus, Science Direct, and ProQuest. The keywords used in the search engine are HIVAIDS, telehealth, nursing care. Results: Searching for journals using an online database resulted in several journals, then picking up eight journals to review. The results show that applying telehealth in health services for people with HIV AIDS has been used in all parts of the world. The telehealth technology used includes the use of landlines, cell phones, the internet, and social media. The influence that occurs due to telehealth is quite varied with attitudes and decision maker of people with HIV. Conclusion: Telehealth can be used as a medium to provide health and nursing services to people with HIV AIDS.

Efficiency of PID Controller Based on Genetic Algorithm for controlling a Quarter Car Suspension System

the purpose of this paper is to improve the performance of a car's active suspension system (a quarter model), with two degrees of freedom , a combination of components and mechanisms ensure both passengers' comfort and driving safety, the stability and ride performance depends generally on the quality of the suspension , and this is why car manufacturers are turning to an adjustable suspension that can be adapted to any type of road surface as it controls vertical movement for car wheels. In this work we show how proportional integral differential (PID) controller tuned by using two methods, Ziegler Nichols and genetic algorithms (GA) can used to achieve a good performance of the active suspension system, The simulation results show the robustness and effectiveness of genetic algorithm (GA) in providing good ride quality and good road handling, however the presence of a time delay.

Seaport Terminals Risks Prioritization Using a Structural Modeling-Based Approach: A Real Case Study

Port risk management (PRM) during port operations is a current problem that can negatively affect the environment, people, and economic issues. In the literature, there is an enormous amount of research related to supply chain risk management (SCRM) in various areas and with various objectives. However, PRM has not received the same degree of attention. In fact, port terminals are crucial links in most supply chain networks and an important pillar of international trade. Therefore, for better risk mitigation efficiency, a risk assessment and prioritization step are vital. Recently in the literature, researchers have applied prospective methods such as structural analysis methods to risk prioritization in SCRM. The aim of this research is to prioritize various man-made risk variables in PRM using a qualitative structural modeling-based approach, specifically, the MICMAC method (referring to its French acronym: Matrice d’Impacts Croisés Multiplication Appliquée à un Classement). An empirical study was conducted to assesses and prioritize risk variables of the seaport terminals of Sfax (Tunisia). The main contributions of the empirical research are twofold. First, to prioritize the key risk variables to define the most critical ones that require immediate intervention. Second, to analyze the structure of the influences between all identified risk variables. The results for the port terminals of Sfax show that the highest-priority risk variables are the manual handling (Ph3), disregard for safety aspects (Ph4), unsafe storage of goods (Inc1), absence of a prevention system and a rescue organization (Inc2), neglect of the regulatory aspects of handling equipment (M1), ignorance of good handling practices during the operation of loading and unloading (Cho2), and inadequate lifting accessories (Cho3). These risk variables must be the subject of urgent risk reduction strategies.

Food safety and the informal milk supply chain in Kenya

BackgroundInformal dairy supply chains are important in Sub-Saharan Africa, both in terms of employment and nutrition for poor population. Their safety has been debated in the literature, with those in favour to their legalisation, arguing that boiling milk reduces sanitary risks for its consumption and the nutritional impact offsets those possible risks. While, the opposing side, highlighting that boiling milk does not eliminate all the contaminants that are found, and the long term sanitary and health impact should be a major concern for regulatory enforcement.The purpose of this case study, which focuses on food safety along a dairy supply chain in Kenya, the largest milk producer in Africa, is twofold: first, to review the different issues on food safety when consuming raw milk, and second, to extract lessons from a case study that follows an informal supply chain that operates in rural, peri-urban and urban areas in the Kiambu and Muranga counties in Kenya. This case study was based on semi-structure interviews to 29 stakeholders and participants of an informal dairy supply chain carried out in April–May 2019. The purpose of the interviews was to provide insights of the hurdles and food safety risks surrounding everyday activities of milk handlers.ResultsThe results indicate that the informal dairy sector is associated with low-quality milk and food safety risks. These assumptions are linked to several factors such as lack of contact and control from the sanitary and health authorities, lack of awareness regarding milk safety from both consumers and the different supply chain participants; and the poor operating conditions the informal market has. In addition, other aspects were the overall lack of hygiene, accountability, and infrastructure in the entire supply chain.ConclusionsIn conclusion, greater focus should be put on improving food safety quality along the chain (e.g., through ensuring the application of Good Handling Practices like the use of food grade containers and the introduction control points). The reform of Kenya’s informal dairy market must focus on training to improve and increase the hygiene and safety practices of the informal operators to reduce the information gap that divides formal from informal.

Functional Outcome of Hybrid External Fixator in Tibial Pilon Fractures

Introduction: Tibial pilon fractures are difficult fractures mostly secondary to high-energy trauma. There are various options to treat these fractures, but the priority is always an anatomic reduction and articular congruity with good soft tissue handling. The aim of the study was to analyze the functional outcome of tibial pilon fractures managed with a hybrid external fixator as definitive management.
 Methods: We evaluated 28 patients with tibial pilon fractures with a mean age of 34.8 years. All patients who fulfilled the inclusion criteria were taken to the operating room for debridement and application of a hybrid external fixator.
 Results: The most common mechanism of injury was road traffic accidents and most of our patients had comminuted fractures. The fibula was fractured in 23 (82.14%) of our patients. The fractures united on an average of 15.28 weeks. Based on the Ovadia & Beals objective scoring system 75% of our patients scored excellent or good on objective scoring and subjective scoring 82.14% of our patients scored excellent or good. We had 12 cases of pin tract infection, 2 cases of delayed union, and 2 cases of malunion but no incidence of non-union, osteomyelitis, or septic arthritis. Eight of our patients had ankle joint stiffness.
 Conclusion: Hybrid external fixator is an effective method of treatment for tibial pilon fractures with comparable union rate and complications to other modalities.

Alginate Self-Crosslinking Ink for 3D Extrusion-Based Cryoprinting and Application for Epirubicin-HCl Delivery on MCF-7 Cells.

3D-printed hydrogels are particularly advantageous as drug-delivery platforms but their loading with water-soluble active compounds remains a challenge requiring the development of innovative inks. Here, we propose a new 3D extrusion-based approach that, by exploiting the internal gelation of the alginate, avoids the post-printing crosslinking process and allows the loading of epirubicin-HCl (EPI). The critical combinations of alginate, calcium carbonate and d-glucono-δ-lactone (GDL) combined with the scaffold production parameters (extrusion time, temperature, and curing time) were evaluated and discussed. The internal gelation in tandem with 3D extrusion allowed the preparation of alginate hydrogels with a complex shape and good handling properties. The dispersion of epirubicin-HCl in the hydrogel matrix confirmed the potential of this self-crosslinking alginate-based ink for the preparation of 3D-printed drug-delivery platforms. Drug release from 3D-printed hydrogels was monitored, and the cytotoxic activity was tested against MCF-7 cells. Finally, the change in the expression pattern of anti-apoptotic, pro-apoptotic, and autophagy protein markers was monitored by liquid-chromatography tandem-mass-spectrometry after exposure of MCF-7 to the EPI-loaded hydrogels.

Mode II fracture characterization of toughened epoxy resin composites

Epoxy resin used commonly as a matrix for polymer composite materials has good handling properties, but is too brittle. That is why various modifiers are used to increase the flexibility of products based on epoxy resin. This leads to two issues: how to efficiently increase the toughness of the resin without impacting significantly other properties, as well as how to measure the toughness in composite materials. The work aimed to show how the addition of a reactive rubber modifier will affect the fracture toughness of the obtained laminates during the longitudinal shear test (Mode II fracture). In total, three epoxy-glass laminates with different matrices were made and subjected to the End-Notched Flexure test according to ASTM D7905/D7905M standard: (1) the basic matrix of Epidian 6 resin, (2) Epidian 6 modified with the addition of 10% of Albipox 1000 reactive liquid rubber and (3) Epidian 6 modified with the addition of 10% of Hypro 1300X16 ATBN reactive liquid rubber. Based on the obtained results, it can be seen that the modulus of elasticity for the modified laminates was decreased compared to the laminate of pure epoxy resin (by ~ 25%). However, the addition of reactive rubbers increased the fracture toughness of the modified epoxy-glass laminates in the Mode II longitudinal shear test (GIIc) by ~ 40–60%. Thus the benefits of modification outweigh the drawbacks if fracture toughness is an important designing consideration in a given application. The applicability of ENF method is successfully tested, but potential drawbacks are indicated—careful control of specimen thickness is necessary.

Research of Linear Electromagnet Motor Application on Automotive Suspension System

Vehicles are constantly being developed to provide comfortable transportation for people. This article is devoted to studying suspension systems by introducing an overview of the components that make the system, background theory, and methods of studying suspension systems using magnetic damping presented and analyzing the nature of magnetic field dampers. The suspension system always focuses on research and development to bring good handling and driving quality to the car. The suspension is intended to strengthen these elements using a weak linkage between the wheel and the body and the shock absorbers. Cars are comfortable based on passive suspension with magnetic damping to active suspension systems. The discussion is to develop a suspension system whose characteristics relate to the vehicle and the road surface. This system is under control by magnetic actuator force using the distance signal between the body car and road surface. The paper presents a study on a suspension system that simultaneously uses controlled magnetic damping to improve a car's comfort and grip.

Examination of aspects of pro-consumer refund system

PurposePro-consumer refund system (PCRS) should be understood as a process in customer service, within which activities are related to the handling of goods that do not meet customer expectations, both in business-to-consumer (B2C) and business-to-business (B2B) relations. The research monitored three groups of variables – the importance of shopping decision factors, customer ID characteristics and PCRS characteristics. The authors explore relationships between these three groups of variables, and the authors tried to understand better the role of the PCRS system in customer perception of service quality.Design/methodology/approachAn electronic survey was used to collect data in the planned structure. Research questions were developed into variables, and these were then the basis for creating questionnaires. Data were collected through electronic questionnaires. The sample consisted of 327 respondents from Poland (confidence level = 95%, confidence interval = 5.42).FindingsThe results of the research show that the PCRS is very important and appreciated from the customer's perspective. Most of the respondents are aware of their consumer rights and correctly understand the meaning of the term “pro-consumer refund system”. Respondents require complex service in terms of returns; their satisfaction does not depend on any individual factor. This also means that the return system must be lenient in each aspect.Originality/valueA detailed analysis of aspects of PCRS has not yet been carried out in the literature. Although previous studies have focused, at least in part, on defining the essential attributes of PCRS, in most cases, it was an organization-driven view of this topic. The research examined the interrelationships between aspects of PCRS based on empirical data and offered a new perspective on this evolving concept.

Management of External Cervical Resorption in Maxillary Central Incisor with Biodentine and Collagen Membrane: A Case Report

Invasive cervical resorption is a relatively uncommon form of a chronic inflammatory process that results in loss of dentine and is usually initiated in the pulp space. It begins as a localised resorptive process that initiates in the area of the root beneath the epithelial attachment and the coronal part of the alveolar process. The lesion is mainly detected on radiographs and exhibits no external signs. The limitations of conventional radiography make Cone Beam Computed Tomography (CBCT) an effective and accurate method of diagnosing root resorptions. The tooth is normally asymptomatic, and the diagnosis is usually made based on a routine examination. Most authors refer to dental trauma, whitening agents, and orthodontic treatment as aetiologic factors. This disorder necessitates a thorough study of the pathologic process in order to determine the source and stop the resorptive phenomenon. The treatment should seek to completely remove the resorptive defect and rebuild it with an appropriate filling substance. Biodentine, a calcium silicate-based material, can be used to fill resorptive defects in the teeth. Furthermore, biodentine has some desirable additional properties over Mineral Trioxide Aggregate (MTA), such as improved antibacterial properties, bioactivity-inducing hard tissue formation, good handling, self-adhesion to dentine, and shorter setting time. Hence, this article presents a case report of external cervical resorption of the maxillary central incisor. Biodentine along with collagen membrane was used to fill the resorptive defect. One year radiographic follow-up showed stability of the resorption site.

Knowledge and practices of pregnant women about iodized salt and its availability in their households in Hawassa city. Community-based cross-sectional study.

Objectives:This study was aimed to assess the knowledge and practices of pregnant women about iodized salt and its availability in their households in Hawassa city, EthiopiaMethods:A community-based cross-sectional study design was conducted among pregnant women with a total sample size (N) = 553 in Hawassa city. A multi-stage sampling technique was employed. First, four sub-cities of Hawassa city (out of eight sub-cities) were selected using the lottery method. Households of pregnant women in each selected sub-city were identified and screened. Finally, representative samples were drawn using systematic random sampling technique.Results:A total of 537 pregnant women was included, a response rate of 97.1%. This was due to incomplete data for nine and participation refusal for seven participants. The mean age of the participants was 26.98 ± 4.75 years. About 52.51% and 52.33% of the respondents had good knowledge and good salt handling practices, respectively. Regarding availability of iodized salt, 65.55% of pregnant women (31.66% salt with iodine level ⩾15 parts per million (ppm) and 33.89% salt with iodine level <15 ppm) had iodized salt and the remaining 34.45% non-iodized salt (0 ppm) respectively.Conclusion:Availability of iodized salt in households of pregnant women was 65.55% (>0 ppm). More than one-third of pregnant women in Hawassa city are utilized non-iodized salt (0 ppm). Nearly half of the pregnant women in Hawassa city had poor knowledge and poor practice about iodized salt. Hawassa city Health Department along with concerned stakeholders should invest more effort to increase awareness about iodized salt and how to handle it safely in households.

Advanced Electrochemical Reamer (EC-Reamer) for Root Canal Treatment.

According to the American Association of Endodontists (AAE), 22 million endodontic procedures have been performed annually. Root canal treatment is needed to prevent infection and restore function when a tooth is severely infected or decayed. This procedure is the only way to preserve the natural tooth and avoid artificial replacement (implant, denture, etc.). The current study aims to develop an electrochemical reamer (EC-Reamer or EC-R) that can help to disinfect the canal system and thus improve the success rate of root canal treatment. The COMSOL Multiphysics software was utilized to simulate the experimental setup and confirm the current flow in the electrolyte. The benchtop experimental approach follows a specific electrochemical protocol, (i) open circuit potential to monitor the electrochemical stabilization and (ii) potentiostatic scan at -9.0 V as the treatment stage. Identification of feasible reference electrode (RE) and insulation material for the exploratory benchtop studies considered platinum (Pt) and gold (Au) wire as the REs and hot melt adhesive (HMA) and liquid tape as the insulation materials. The antimicrobial effects of EC-R were analysed using Enterococcus faecalis (E. faecalis). One-way ANOVA with the Tukey post hoc test and a significance level of P<0.05 is used to compare the groups with an experimental duration of 60 seconds. The findings showed that magnitude and current fluctuations created by Pt wire are promising when compared to Au wire, while Pt-HMA pair is chosen considering Pt's good electrochemical inertness and HMA's easy handling, availability, and non-hazardous features. The use of potentiostatic duration of 1 s and 3 s resulted in >99.99% E. faecalis reduction. Duration at 5 s and above resulted in a total bacterial kill. Statistical analysis confirmed a significant difference among the groups tested with commercial and custom-built potentiostats. The outcome provided preliminary data for developing an EC-R prototype to enhance the antimicrobial effect during root canal treatment potentially. (EEJ-2022-01-04).

Comprehensive Evaluation and Decision for Goaf Based on Fuzzy Theory in Underground Metal Mine

In underground metal mines, goaf brings huge safety risks. It is an important part of mine to evaluate goaf stability and determine the best goaf handling measures. However, the evaluation and decision are often separated; they need to be unified. Meanwhile, stability evaluation and decision for goaf are a complex system engineering of rock masses in underground mining, and subjectivity exists in the evaluation and decision process. Under these conditions, it is necessary to minimize subjectivity, and the results of stability evaluation also need to be considered comprehensively in determining handling measures. In this paper, the fuzzy theory was adopted based on the fact that the goaf stability evaluation and handling measure decision were fuzziness. Firstly, the goaf stability model was established by a two‐layer fuzzy comprehensive evaluation. It took into account 12‐factor indexes of goaf with engineering empirical approaches and divided them into 3 categories according to their engineering categories. The model improved the applicability of the goaf stability evaluation results, and the results were the basis for goaf handling measures as well. Secondly, a decision model of the goaf handling measures was established by multiobjective fuzzy optimization. It consisted of five goaf handling measures and five evaluation indexes. The model provided a comprehensive decision and optimal scheme for goaf handling. Two models were also applied to the Paishanlou gold mine and achieved a good handling result. The practical application showed that the two models were feasible.

CONHECIMENTO DOS MANIPULADORES DE ALIMENTOS SOBRE BOAS PRÁTICAS, NO CONTEXTO SARS-CoV-2, NA CIDADE DE PATROCINIO/MG

INTRODUCTION: In the 21st century, world society is subjugated to measures of social isolation defined by the World Health Organization as a pandemic. Among the questions about transmission, contamination and ways of preventing the virus, the interrogative in the food area arises. OBJECTIVE: To evaluate the level of knowledge of food handlers regarding good handling practices in the context of SARS-CoV-2. METHODS: This is a cross-sectional descriptive and quantitative study, with 13 food handlers from two Food and Nutrition Units in the municipality of Patrocínio-MG, through a questionnaire to evaluate their previous knowledge about good practices, then a training was given regarding good practices focused on care during the pandemic and after the application of the same questionnaire to evaluate the impact of the guidelines. RESULTS: The results indicate that 92.3% (n=12) are female and 38.46% (n=5) of the workers have completed high school. Of the number surveyed, 92.3% (n=12) had training and 7.7% (n=1) never had it. Knowledge about food contamination and good handling practices in companies I and II had a percentage of 100.0% and 88.05, respectively. CONCLUSION: During the interviews it was observed that most employees, despite having knowledge about the correct practices, continuous training is of extreme need.

Textile Reinforced Concrete for free-form concrete elements: Influence of the binding type of textile reinforcements on the drapability for manufacturing double-curved concrete elements

Textile reinforced concrete (TRC) is a sustainable composite material consisting of a cementitious based matrix in combination with an open meshed technical textile reinforcement made of carbon or glass fibres. In the future, TRC could be increasingly used in the form of double-curved concrete elements with the aim of producing filigree yet load-bearing concrete shell structures. To assess whether a textile is suitable as a reinforcement structure in double-curved textile concrete elements, numerous properties need to be investigated and evaluated. The most important of these include good handling properties, bending stiffness tailored to the application, sufficiently pronounced mesh openings, and defect-free drapability. In the course of this work, biaxially reinforced knitted fabrics with five different stitch types (pillar open, pillar closed, tricot counterlaid, tricot closed and plain) were investigated to evaluate the above properties. The draping tests were conducted on a robot-controlled draping test apparatus and evaluated with the aid of an optical measuring system. In addition, the geometric relationship between surface curvature of the double curved elements and the shear angle of different textiles was used to classify the influence of the stitch type on the drapability. Finally, for a given double curved geometry, based on the results the selection of an appropriate textile reinforcement which fulfil the component requirements is carried out and a double curved TRC demonstrator element is prefabricated.