September 2021

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Optimized Forest Harvest Planning with Adjacency Constraints: A Bibliometric Contribution

Tamires de Almeida Sfeir, Julio Eduardo Arce, José Eduardo Pécora Junior, Afonso Figueiredo Filho

ABSTRACT: BACKGROUND: One of the main stages in forest industry is harvest planning. The use of spatial adjacency constraints has increased in harvest planning models due to the growing interest in environmental aspects. OBJECTIVE: This study aims to present a bibliometric analysis of works that address the optimized forest harvest planning using ARM and URM adjacency constraints. We aim to identify the major countries responsible for publications, the main methods of resolution employed, the objective functions of the most significant interest in the formulation of the problem, citation analyses and the citation, co-citation, and word co-occurrence networks. Generating from these analyses a greater understanding of the subject and identifying the theoretical basis of the area. RESULTS: We conducted the research as a systematic review, supported by bibliometric techniques. The ISI Web of Science database was consulted, and the data was processed with VOSviewer and CitNetExplorer softwares. A total of 44 articles published between 2008 and 2018 were analyzed. Most papers used the ARM approach to model the harvest plan considering spatial adjacency constraints. Heuristic methods, such as simulated annealing, were the main resolution alternatives found to circumvent the time and computational processing demands caused by the complex nature of the problem. CONCLUSION: This research helped to identify the theoretical background of publications that deal with spatial adjacency constraints in the forest sector. A significant relationship between the publications in the sample was found, with only six articles not linked to the others. Finally, we conclude that the interest in research that incorporates environmental aspects in its scope has increased, thereby increasing the complexity of mathematical models that describe these new scenarios, providing a space for the development of new research in the area.

[ FULL TEXT PDF 1-11 ] 10.22587/ajbas.2021.15.9.1

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Leucine-rich glioma-inactivated-1 antibody encephalitis in a 56-year-old lady with altered mental status and unexplained seizure: A case report

Maliha Hakim, Mohammad Nur Uddin, Mashfiqul Hasan

ABSTRACT: BACKGROUND: Leucine-rich glioma-inactivated 1 (LGI1) antibody encephalitis is a type of autoimmune encephalitis, diagnostic facility for which is not widely available. OBJECTIVE: The aim of the study is to describe the diagnostic pearls of a case of LGI1 antibody encephalitis. METHOD: Clinical evaluation and laboratory tests including autoimmune encephalitis antibody panel of the patient were done. RESULTS: A 56-year-old lady presented with a 10-month history of sleep disturbance and irrelevant talking along with tremulous movements and seizures affecting arms and face (faciobrachial dystonic seizure; FBDS). After excluding the differential diagnoses CSF was studied for autoimmune encephalitis panel of which LGI1 came positive. Following treatment with intra-venous methyl prednisolone and plasmapheresis the seizure was controlled and the patient was doing better. CONCLUSIONS: Autoimmune encephalitis needs to be considered and screened for in patients with suggestive clinical presentation as treatment is often rewarding with remarkable clinical improvements. FBDS is a characteristic seizure that points towards the diagnosis of LGI1 encephalitis.

[ FULL TEXT PDF 12-15 ] 10.22587/ajbas.2021.15.9.2

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Water Wheel Turbine Performance as a Power Plant in Waste Water Pit PLTU System

Firman Firman, Muhammad Ruswandi Djalal, Aznia Karim, Taufiq Hidayatullah, Fadilatul Uswah

ABSTRACT: Water wheel turbines can utilize the flow from wastewater from a generator (waste water pit) which has a large enough discharge. If the water wheel turbine is coupled with a generator, it will produce electrical energy. The application of water wheel turbines in the waste water pit can be utilized for lighting around the power plant. In addition, with the water wheel, the process of heat transfer by convection which generally occurs in the waste water pit. With this water wheel, it will help the process of decreasing the temperature of waste water in the waste water pit. This study aims to determine the performance of water wheel turbines that are applied as a power generator as well as an agitator in a waste water pit. The water wheel turbine model used in this study has dimensions which are: outer diameter of 40 cm; inner diameter of 24 cm; width 8 cm; blade width 8 cm, blade length 8 cm; and 16 spoons. Tests carried out with a temperature of 50oC, a flow rate of 38 l/min, 48 l/min, and 60 l/min. Furthermore, the measurement of water temperature before the water wheel (°C) is measured; water temperature after the water wheel (°C) of 6 points with a distance between points one meter; generator voltage (V); current generator (A); and generator speed (rpm). From the results of the discussion it can be concluded that the best operating condition of the water wheel turbine as a generator as well as a stirrer is the Re 18000 number with an efficiency of 36.5% and an average temperature reduction of 1.6oC/m. From this research, it is known the performance of water wheel turbines that are applied as a power generator as well as an agitator in a waste water pit.

[ FULL TEXT PDF 16-23 ] 10.22587/ajbas.2021.15.9.3

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