bluuebunny/crossref_metadata_2025_split huggingface dataset:
Sound Absorbent And Damping Rate of The Natural Composites Design
Authors: Kunthi Sekarani Andari , Hawa Baiq Siti , Auliya Firda 
Published: August 2022

This research was conducted to determine the sound attenuation level of composite. The composite used in this study iscompound Kalimantan sawdust and pineapple leaf fiber. The research objective was to determine the damping rate of composites (fine Kalimantan sawdust and compound of coarse Kalimantan sawdust with pineapple leaf fiber), so it can be used as an alternative sound absorbent material. The composite testing process uses a Sounds Level Meter by adjusting the frequency of the sound source. The space partition is a composite, measured the value of sound intensity at a certain distance, then given a partition, the sound intensity is again measured with the same distance. The results of the absorption coefficient of pineapple leaf fiber composite and red meranti wood sawdust can be used as an alternative sound absorbing material besides glass wool so that it can minimize side effects for public health. ©2018 JNSMR UIN Walisongo. All rights reserved.
Synthesis of Low-Cost Adsorbent Based on Fly Ash for Heavy Metal Reduction of Cu and Cr In Textile Industrial Liquid Waste
Authors: Mulyatun Mulyatun 
Published: August 2022

Heavy metal copper (Cu (II)), Chromium (Cr (IV) is a heavy metal that dominates textile industrial wastewater. Too large concentrations of Cu (II) in water can cause poisoning which has side effects of liver damage and gastrointentinal disorders. Cr metal in the body will cause interference with DNA synthesis and increase mutagen changes that can cause tumors. The use of fly ash as a Low Cost Adsorbent is an alternative. The research method used is a physical activation process with carbonization at high temperatures (300˚C, 400˚C and 500˚C) in the furnace to be continued with chemical activation using concentrated acids (H2SO4 and CH3COOH) or base (KOH) in fly ash. Morphological analysis and the synthesized adsorbent function groups were performed using Scanning Electron Microscopes (SEM) and FTIR. Based on the adsorption capacity test, the ability of fly ash to adsorb Cu metal waste was 0.9962 mg/g and for Cr metal was 0.4760 mg/g. The temperature increase on the physical activation of fly ash (300 0C, 4000C, 5000C) causes an increase in the adsorption capacity of the synthesized fly ash. The best adsorbent for Cu metal is A5K with an adsorption capacity of 0.9994 mg/g under optimal conditions. The best adsorbent for Cr metal is A5S with an adsorption capacity of 0.9325 mg/g under optimal conditions. ©2018 JNSMR UIN Walisongo. All rights reserved.
Production of Hand Washing Soap from Ethanol Extract of Fern (Pteridophyta), Nampong Leaves (Siegesbeckia orientalis) and Thistle Plants (Calotropis gigantea)
Authors: Silvia Nuris , Amila Shovi 
Published: August 2022

Soap is an ingredient that comes from natural oils or fats reacting with caustic soda in the process known as lathering or saponification. Hand washing soap from fern (Pteridophyta) as the main ingredient is one of the antiseptic soaps that will be made, by comparing the drug Spirulina to determine the level of anti-bacteria produced. This study uses a hot process method with a soap heating time of about 20 minutes and a heating temperature of around 80°C. The results of testing the quality of hand washing soap as an antiseptic that meets the test standards are organoleptic test, acidity test (pH), foam resistance level test, and skin irritation test. So it's good to use as a hand sanitizer to get rid of bacteria and germs. ©2019 JNSMR UIN Walisongo. All rights reserved.
Utilization of Waste Combustion Heat as an Alternative Renewable Electric Energy Source Based on Thermoelectric Generator
Authors: Liana Yeni Rima , Sulhadi Sulhadi , Aji Mahardika Prasetya 
Published: August 2022

Thermoelectric generator is one alternative energy source that is using a temperature difference system to produce electrical energy. This research study aims to utilize combustion heat waste using a thermoelectric generator as a source of renewable electricity. This research method uses the experimental method. The thermoelectric system was made using seven thermoelectric modules TEC1 - 12706 arranged in series by varying the combustion media in the form of Rice husk, Sengon sawdust (Albizia chinensis) and Teak sawdust (Tectona grandis). The test is done by measuring the output voltage, the temperature of the cold side and the hot side which are then analyzed to get the output power and generator efficiency. From the trial results it was found that the greater of the temperature difference, then the output voltage, output power and generator efficiency increase. Output voltage, output power and maximum efficiency of testing prototype thermoelectric generator that generated were 4.64 V, W 20.38 and 16.46 % with fuel Teak sawdust in the tenth minute when the temperature difference of 76.17 0C.©2019 JNSMR UIN Walisongo. All rights reserved.
Quality of Biocompost Resulting from Biopore Holes Based on Light Intensity and Acidity Degree (pH)
Authors: Pujiyanti Arik , Sulhadi Sulhadi , Aji Mahardika Prasetya 
Published: August 2022

The use of chemical fertilizers that are not balanced with the provision of organic fertilizers can damage the soil. Chemical fertilizers can also damage the balance of nutrients in the soil and lower soil pH. Therefore, organic fertilizers are needed to help restore soil fertility and LRB as a medium for composting organic fertilizers. The biopore infiltration hole (LRB) is "activated" by providing organic waste. This waste will be used as a source of energy for soil organisms to carry out their activities through the decomposition process. This decomposed waste is known as compost. Compost is a term for man-made organic fertilizer made from the decomposition process of the remains of living things (plants or animals). The investigation of this study was to determine the quality of compost based on light intensity and acidity (pH) from the results of biopore infiltration holes (LRB) as well as good physical properties of compost. This type of research is an experimental research. Good quality compost has low resistance. The pH value of the compost in samples A,B,D,E is 6.5-7.5 so it is neutral, while the pH of the compost sample C is 8.5 is alkaline. The intensity of the light is high. The results of the lowest light intensity in the compost from this study were leaf compost + sawdust + EM4 of 990 lux, fermented in LRB for 2 weeks. Meanwhile, the highest light intensity value was found in the compost of raw material leaves which were fermented for 1 month at 1017 lux. So the greater the value of light intensity in the compost, the better quality it has, because it can improve soil fertility. ©2019 JNSMR UIN Walisongo. All rights reserved.
Study on Diversity of Dragonfly (Odonata) as A Bioindicator of Water Quality in Mount Muria Area, Central Java
Authors: Hidayat Saifullah , Husnia Fiki , Rohmah Ellatur , Mukhlishoh Siti 
Published: August 2022

Water in the Mount Muria area is needed by the surrounding community to fulfill life. An indicator is needed to determine water quality. Dragonfly (Odonata) is one of the organisms as ecosystem controllers and bioindicators. This study aims to determine the diversity of dragonflies, determine water quality and describe the role of dragonflies as a bioindicator of water quality in the Mount Muria area. This type of research is descriptive quantitative research. The data collection technique used direct observation at 3 stations, namely the Colo Flower River, the Monthel Waterfall River and the River in the Rejenu Area. The results showed that there were 10 species of dragonflies consisting of 6 suborders Anisoptera and 4 suborders Zygoptera with the highest abundance value being Euphaea variegata (51.39%), Enallagma signatum (28.47%), Trithemis festiva (6.94%), Orthetrum glaucum (5.56%), Orthetrum chrysis (2.78%), Orthetrum pruinosum (2.08%), Orthetrum testaceum (0.69%), Orthetrum sabina (0.69%), Prodasineura autumnalis (0.69% ), and Drepanosticta fontinalis (0.69%). Based on water quality analysis and according to government regulation no. 82 of 2001, the water in the muria river belongs to category 2. According to the analysis of the family biotic index, it can be seen that the FBI value of the river in the Muria area is 5.60 which means the condition of the river is fair with moderate pollution levels. ©2019 JNSMR UIN Walisongo. All rights reserved.
Synthesis of Hydrochar Cassava peels with hydrothermal carbonization method and applications as hard water softener
Authors: Pratiwi Dzikria Sari , Udaibah Wirda , Kustomo Kustomo 
Published: August 2022

Groundwater before being used is very important to pay attention to the quality of the water. Water has good quality if it is in accordance with several parameters, including chemical, physical, and biological parameters. Mineral salt content is one of the chemical parameters that can be used to determine the quality of water. In this study, the synthesis of cassava peel hydrochar was successfully carried out using the hydrothermal carbonization (HTC) method. This material was developed to reduce waste of cassava peel biomass and overcome the problem of water hardness. HTC cassava peel was developed as an alternative hard water softener adsorbent. The results of FTIR characterization on hydro-activation (activating hydrochar) and hydro-non (non-activating hydrochar) contain functional groups of O-H stretch, C-H stretch, C≡C stretch and C=C stretch. Observation of surface morphology by SEM method on hydro-non in the form of large sheets, while the surface on hydro-activities in the form of small sheets. The adsorption capacity of hydro-active against Ca2+ ions and Mg2+ ions were 85.240 mg/g and 87.210 mg/g, respectively. Meanwhile, the hydro-non adsorption capacity of Ca2+ and Mg2+ ions were 84,736 mg/g and 85,713 mg/g. The kinetics of hydro-active adsorption on Mg2+ ion took place on order 3 (0.000003 min-1) while when adsorption of Ca2+ ion took place on order 0 (0.0324 min-1).©2021 JNSMR UIN Walisongo. All rights reserved.
Minimization of time distribution of ballots with Greedy algorithms in Jombang Regency
Authors: Dewi Erina Seviyanti , Fauzia Latifah Asmaul 
Published: August 2022

Travelling Salesman Problem is a problem faced by salesmen in distributing goods by passing all points exactly once. This problem is often encountered in life, not least in the distribution of election ballots from the Komisi Pemilihan Umum Daerah (KPUD) Jombang office to the sub-district office in Jombang Regency. Proper route determination can help to minimize the travelling time between places so that the risk of delaying ballot distribution can be avoided. In determining the solution of Traveling Salesman Problem, a Hamiltonian cycle is required. The Hamiltonian cycle is a closed trail that passes every point exactly one time. The Hamilton cycle can be formed by the Greedy Algorithm. The Greedy Algorithm can quickly determine the next point based on the smallest weight in the form of distance between points. From the problem of ballot distribution in Jombang, the starting point of the route is the office of Komisi Pemilihan Umum Daerah (KPUD) Jombang then through 21 sub-district offices and back to the Komisi Pemilihan Umum Daerah (KPUD) office Jombang. Based on the searching for solutions to minimize the distribution time of ballots in Jombang Regency with Greedy Algorithm, the total distance to pass all existing sub-district offices is 253.1 km with a travel time of 427 minutes or 7 hours 7 minutes.©2021 JNSMR UIN Walisongo. All rights reserved.
Design and accuracy test of polar moment of inertia measuring equipment for projectile and rocket
Authors: Sun Liwei , Wang Shukun , Wang Haokun , Zhao Weihong , Li Junye , Shang Chunmin 
Published: August 2022

The moment of inertia is an important mass characteristic parameter. It has a direct impact on the trajectory, flight stability, strike accuracy, and service life of the projectile. To meet the measurement of the polar moment of inertia of large projectiles and arrows, this paper uses the vibration compound pendulum method to measure the polar moment of inertia of large projectiles and arrows, deeply analyzes the measurement principle, and designs a polar moment of inertia test equipment. Through the measurement of standard samples, the measurement accuracy of the equipment is tested, and the causes of error are analyzed. The experimental results show that the maximum relative error is less than 0.5 %, and the relative uncertainty is 0.813 %, which meets the requirements of expected technical indicators.
Influence of tip leakage flow on the aerodynamic damping of compressor blade torsional vibration
Authors: Zhang Xiang , Guo Xiao , Ren Guozhe 
Published: August 2022

Based on harmonic balance calculation technology with a single-passage phase-lag periodic boundary, the influence of tip gap size on the aerodynamic damping characteristics of rotor for first-order torsional vibration is analyzed with energy method. This research shows that the aerodynamic damping coefficient of the blade has a parabolic distribution law of first decreasing and then increasing with the increase of the tip clearance size. There is a most dangerous clearance value of torsional flutter characteristics in the blade, and the aerodynamic damping under this clearance is 12.67 % lower than the maximum damping value. The influence of the leakage flow on the time-averaged flow field near the blade tip leads to significant differences in the local aerodynamic work. In addition, the effect of leakage flow on the amplitude and phase of the local first-order unsteady pressure also bring about a significant influence on local aerodynamic work near blade tip.
Prevalence of antimicrobial resistance in a Bulgarian drinking water supply system
Authors: Tsvetanova Z. G. , Dimitrov D. N. , Najdenski H. M. 
Published: August 2022

Abstract
Drinking water quality and safety are of great concern for public health. The aim of this study was to assess the prevalence of antimicrobial resistance (AMR) among the heterotrophic bacteria in drinking water provided by a Bulgarian drinking water supply system (DWSS). Culture-dependent methods and conventional PCR assays were used to study drinking water sampled from six locations on its way from the water source to the consumers' taps. The populations of bacteria resistant to nine antibiotics (ABs) from different classes were quantified and the occurrence of seven antibiotic resistance genes (ARG) was determined. The species composition of the bacterial community and the AMR phenotype of isolated bacteria were determined. The AMR level underwent changes within the DWSS network and the population's proportion of bacteria resistant towards the tested ABs differed depending on the sampling site. The increased level of resistance towards some ABs in drinking water emphasize the role of DWSS as a reservoir of antibiotic-resistant bacteria (ARB) and ARGs that could pose a potential human health risk. Being focused on a Bulgarian DWSS, our study will contribute to establishing health hazards associated with ARB and ARGs in drinking water.
Experimental studies on the hydrodynamic properties of a deposit in rapid filters during physicochemical removal of iron from groundwater
Authors: Martynov S. Yu , Poliakov V. L. 
Published: August 2022

Abstract
This article presents the results of experimental studies for information support of the hydraulic compartment of the mathematical model of physicochemical iron removal from groundwater. It is experimentally established that the bound water in the deposit significantly exceeds the mineral component (chemical iron) for any waters with the different levels of iron oxidation. The deposit dehydration takes place at its boundary with the liquid phase. As a result, ferrous iron is gradually oxidized and ferric iron transforms from hydroxide forms to oxide forms, which leads to a decrease in the deposit volume and a increase in its density and strength. Further, the coefficient of the deposit hydrodynamic stability is proposed to use to take into account changes in the properties of the deposit that accumulates in the granular medium. It is experimentally determined that the iron amount remaining in the medium after backwashing increases simultaneously with the deposit's age. It will lead to a gradual reduction of the operational dirt capacity of the granular medium and a need to have measures of the filtration properties restoration or to replace the filter medium entirely.
Space-time characterization of droughts in the Mae Klong River Basin, Thailand, using rainfall anomaly index
Authors: Khalil Alamgir 
Published: August 2022

Abstract
Drought is a slow-onset natural hazard that has major social, economic, and environmental consequences. This study examined the temporal and spatial characteristics of meteorological droughts in the Mae Klong River Basin, Thailand, during 1971–2015. The rainfall anomaly index (RAI) was calculated for 3, 6, and 12 months using monthly observed rainfall data from eight stations. The RAI results showed the presence of multiple drought events ranging from moderate to severe conditions over the study period. Trend analysis was carried out for the drought duration, magnitude, and intensity using the Mann-Kendall test and the Sen's slope method. Increasing trends were found for drought intensity for both the 6- and 12-month time scales. The performance of RAI was assessed by comparison with the standardized precipitation index (SPI). In general, a high correlation (Pearson's coefficient r&gt;0.93) was found between RAI and SPI. Cohen's Kappa test indicated fair agreement between the results of the two drought indices. The findings of this study are expected to help decision-makers better manage the basin's water resources.
Research into an ecological compensation standard in the Minjiang River Basin under the combined scenario of ‘clear property rights, water quality and quantity, and opportunity cost’
Authors: Rao Qinghua , Lin Xiuzhu , Chen Fang , Chen Wenhua , Lin Yunshan , Zeng Yu 
Published: August 2022

Abstract
Quantification methods of river basin ecological compensation with a scientific basis are not only a research hotspot in the field of resources and environment, but also an urgent technical difficulty needing to be solved in environmental management. The theory of property rights and externalities provides us with a new method to understand ecological compensation, which helps us to put forward a clear policy path to effectively solve the problem of ‘the tragedgy of the Commons’ in the ecological environment protection of river basins. Based on the externality problems of social and economic activities for a river basin, a standard calculation method under the combined scenario of ‘clear property rights, water quality and quantity, and opportunity cost’ was built in this paper. Taking the Minjiang River basin as an example, the definition of ecological property rights of the basin was divided into three scenarios: ‘upstream has pollution rights’, ‘upstream has no pollution rights’ and ‘upstream and downstream co-construction and sharing’. Ecological compensation standards of the Minjiang River basin under different property rights from 2015 to 2019 were calculated. The results showed that: (i) in the case where the upstream has pollution rights, the ecological compensation amount of Sanming City ranged from 2.41–9.36 × 108 Yuan, the final compensation value of Nanping City was 2.29–18.99 × 108 Yuan, and the ecological compensation cost of Fuzhou City was 6.78–28.35 × 108 Yuan; (ii) if the upstream area has no pollution rights, the compensation values of Sanming City and Nanping City to the downstream area were each 0; and (iii) under the case of upstream and downstream co-construction and sharing, the ecological compensation value of Sanming City was 6.25–21.34 × 108 Yuan, the final compensation value of Nanping City was 5.80–20.38 × 108 Yuan, and Fuzhou City needed to pay 12.05–36.38 × 108 Yuan for eco-compensation. The calculated results of ecological compensation standards in the Minjiang River basin indicated the amount of ecological compensation paid by the downstream to the upstream showing an upward trend on the whole. This method was relatively easy to define property rights and obtain data, taking into account the benefits of upstream and downstream, and the calculation process was relatively simple, which developed and supplemented the traditional ecological compensation method used for river basins.
produção científica em Turismo e Trabalho
Authors: Conceição Martins da Silva Ivan , Ribeiro Bantim Durães Natasha , Hastenreiter Silva Marina , Corrêa de Almeida Moraes Claudia , Cesar Fratucci Aguinaldo 
Published: August 2022

A presente pesquisa teve por objetivo analisar criticamente a produção científica sobre trabalho e turismo dos principais periódicos brasileiros de Turismo, a partir dos títulos, resumos e palavras-chave dos textos selecionados. Se por um lado observa-se uma desarticulação histórica da academia para consolidação de conceitos, categorias e espaços de discussão para esse tema, por outro, ele aparece com urgência na realidade e vem sendo abordado com destaque nos últimos tempos. A metodologia utilizada consistiu de uma revisão sistemática da literatura sobre os temas “trabalho no turismo” e “trabalhadores do turismo”, tendo como parâmetros pesquisas publicadas, entre 2016 e 2020, em periódicos científicos brasileiros da área do Turismo classificados pelo Qualis Capes 2013-2016 entre as categorias A1 e B5. Foi realizada a leitura interpretativa e crítica de 2388 resumos no total. Como resultados, 117 abordavam turismo e trabalho, o que representa 5% da produção total – e esse número inclui toda pesquisa que tenha abordado alguma questão sobre trabalho e turismo, ainda que não como objetivo principal. Os textos analisados demonstraram que muitas pesquisas ignoram os temas “trabalho” e “trabalhadores”, mesmo quando se propõem a analisar diferentes agentes sociais (stakeholders, instâncias de governança, redes) ou aspectos fundamentalmente ligados aos trabalhadores (como serviços, hospitalidade, produtos). Entretanto, as pesquisas que abordam “trabalho” e “trabalhadores” apresentam ampla diversidade de temas de pesquisa e de categorias profissionais contempladas – confirmando a complexidade e relevância dessa subárea de pesquisa. Assim, esperamos que a presente pesquisa seja um primeiro passo para caracterizar e consolidar a subárea Turismo e Trabalho.