Natural Science: Journal of Science and Technology最新文献_第2页

Review of Recycling Plastic Waste into Briquettes 塑料废弃物资源化成型煤研究进展

Natural Science: Journal of Science and Technology Pub Date : 2022-10-17 DOI: 10.22487/25411969.2022.v11.i01.15812

Apridio Faiz An Nabil, Irsya Emilia Putri, D. Ariyanti, E. Saputro

{"title":"Review of Recycling Plastic Waste into Briquettes","authors":"Apridio Faiz An Nabil, Irsya Emilia Putri, D. Ariyanti, E. Saputro","doi":"10.22487/25411969.2022.v11.i01.15812","DOIUrl":"https://doi.org/10.22487/25411969.2022.v11.i01.15812","url":null,"abstract":"The increasing demand for energy in transportation, industry, and domestic activities around the world is the starting point of the industrial revolution that has an impact on the emergence of environmental problems. The innovation of processing waste into alternative energy sources is an idea that has good potential in overcoming dependence on conventional energy sources. Processing plastic waste into alternative fuels in the form of plastic briquettes, including tertiary recycling. Converting plastic waste into alternative fuels can be done using several variations of methods and variations of adhesive materials. On carbonization only produces one type only. Plastic briquettes (PP) can produce a higher heating value of 9982.779±240.017 cal/gram and 3.90% ash content. From plastic briquettes (PET) 7024.56 cal/gram and 0.27% ash content but also produces a high ash content, this is because there are still impurities in it. Meanwhile, for the type of adhesive with the same composition as briquettes with starch adhesive, the heat value was 6328 kcal/kg, arpus 6366 kcal/kg. Although the calorific value is higher, the arpus adhesive usually tends to produce briquettes with black smoke, this is due to the composition of the arpus which is made from rubber tree sap.","PeriodicalId":399499,"journal":{"name":"Natural Science: Journal of Science and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129526029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The toxicity of Meistera chinensis rhizome fraction by shrimp larvae with the BSLT method 用BSLT法测定中国沼虾根茎部分对虾仔的毒性

Natural Science: Journal of Science and Technology Pub Date : 2021-12-31 DOI: 10.22487/25411969.2021.v10.i02.15673

Reymon Reymon, Suhikma Sofyan, A. W. Yodha, Musdalipah Musdalipah

{"title":"The toxicity of Meistera chinensis rhizome fraction by shrimp larvae with the BSLT method","authors":"Reymon Reymon, Suhikma Sofyan, A. W. Yodha, Musdalipah Musdalipah","doi":"10.22487/25411969.2021.v10.i02.15673","DOIUrl":"https://doi.org/10.22487/25411969.2021.v10.i02.15673","url":null,"abstract":"Meistera chinensis is a species that belong to the Zingiberacea family. In Southeast Sulawesi, a population of Meistera chinensis was found in the Abuki forest of Konawe Regency. Empirically, its consumed by the community as a cooking spice and body fitness. The results of previous research revealed that Meistera chinensis fruit is efficacious as an antioxidant, anticancer, antimicrobial and antifungal. Research on the rhizome has never been done. This study aims to determine the potential for toxicity and the LC50 value of Meistera chinensis rhizome using the BSLT method. The rhizomes were extracted with 96% ethanol and concentrated using a rotary evaporator. Then fractionation was carried out with methanol and ethyl acetate as solvents. The concentration of the rhizome fraction was 7.81 ppm, 15.63 ppm, 32.25 ppm, 62.5 ppm, 125 ppm, 250 ppm, 500 ppm and 1000 ppm. Positive control used of 1.4 mg potassium bichromate and negative control is DMSO. Toxicity was determined based on the mortality of shrimp larvae and calculated by determining the LC50 value. The results showed that the LC50 values for the methanol, ethyl acetate and positive control fractions of Meistera chinensis rhizome were 252.88 mg/L, 57.17 mg/L, and 6.22 mg/L, respectively. Based on these results, it can be concluded that the Meistera chinensis rhizome fraction has a toxic effect on shrimp larvae (≤1,000 mg/L).","PeriodicalId":399499,"journal":{"name":"Natural Science: Journal of Science and Technology","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127968353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Determination of peroxide by spectrophotometry in waste cooking oil using adsorbents from banana midrib and water hyacinth 用香蕉中脉和水葫芦吸附剂分光光度法测定废食用油中的过氧化物

Natural Science: Journal of Science and Technology Pub Date : 2021-12-31 DOI: 10.22487/25411969.2021.v10.i02.15635

E. Yazid, A. Wafi, Siti Maryaningsih

{"title":"Determination of peroxide by spectrophotometry in waste cooking oil using adsorbents from banana midrib and water hyacinth","authors":"E. Yazid, A. Wafi, Siti Maryaningsih","doi":"10.22487/25411969.2021.v10.i02.15635","DOIUrl":"https://doi.org/10.22487/25411969.2021.v10.i02.15635","url":null,"abstract":"Waste cooking oil is cooking oil that has been used to fry food ingredients repeatedly. Cooking oil heated at high temperatures will be damaged to produce peroxide compounds that accelerate the process of developing a rancid odor, reducing the quality of the oil and the nutritional value of fried foods. The research was conducted by the spectrophotometric method using a wavelength of 200-300 nm. Based on the results of the study, the addition of 0.5 g, 1.0 g, 1.5 g and 2.0 g of banana midrib adsorbents obtained peroxide concentrations of 0.031%, 0.033%, 0.034%, and 0.034% respectively. The addition of water hyacinth adsorbent successively obtained 0.035%; 0.038%, 0.039%, and 0.038%. The largest percentage decrease was found in the addition of banana midrib adsorbents, namely 38% and water hyacinth 30%. From the independent T-test statistical test, it was obtained that p<0.05 was significant, so it can be concluded that there was a decrease in peroxide concentration in the addition of banana midrib and water hyacinth adsorbents to waste cooking oil \u0000Keywords: Adsorbent, Waste cooking oil, Peroxide, Banana midrib, water hyacinth.","PeriodicalId":399499,"journal":{"name":"Natural Science: Journal of Science and Technology","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134108095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Taxonomic status ot the earthworm species Metaphire saigonensis (Omodeo, 1956) (Clitellata: Megascolecidae) 蚯蚓的分类学地位(鞘翅目:大鞘翅科)

Natural Science: Journal of Science and Technology Pub Date : 2021-12-31 DOI: 10.22487/25411969.2021.v10.i02.15542

Tung T. Nguyen, Dung Ngoc Thai, Y. T. Trang, Vy T Duong

引用次数: 0

Forecasting of stock prices on the Indonesian Sharia Stock Index (ISSI) using backpropogation artificial neural network 利用反向传播人工神经网络预测印尼伊斯兰教股票指数(ISSI)的股价

Natural Science: Journal of Science and Technology Pub Date : 2021-12-31 DOI: 10.22487/25411969.2021.v10.i02.15622

Dede Arseyani Pratamasyari

引用次数: 0

Analysis of poverty factors in Sulawesi by using path analysis 用通径分析法分析苏拉威西岛贫困因素

Natural Science: Journal of Science and Technology Pub Date : 2021-12-31 DOI: 10.22487/25411969.2021.v10.i02.15648

Fadjryani Fadjryani, Nur Sakinah Lombang

引用次数: 0

Antibacterial Activity of the Ethanolic Extract of Sembung Rambat (Mikania micrantha Kunth) Leaves Against Bacillus subtilis 薇甘菊叶乙醇提取物对枯草芽孢杆菌的抑菌活性研究

Natural Science: Journal of Science and Technology Pub Date : 2021-05-31 DOI: 10.22487/25411969.2021.v10.i1.15476

Alfredi Anis Fadhila G.S, W. Darwis, R. H. Wibowo, S. Sipriyadi, R. Supriati

{"title":"Antibacterial Activity of the Ethanolic Extract of Sembung Rambat (Mikania micrantha Kunth) Leaves Against Bacillus subtilis","authors":"Alfredi Anis Fadhila G.S, W. Darwis, R. H. Wibowo, S. Sipriyadi, R. Supriati","doi":"10.22487/25411969.2021.v10.i1.15476","DOIUrl":"https://doi.org/10.22487/25411969.2021.v10.i1.15476","url":null,"abstract":"Sembung rambat (Mikania micrantha Kunth.) is a weed whose presence is detrimental to agriculture because it can prevent agricultural plants from absorbing nutrients, water and light for photosynthesis. But behind that it turns out that sembung rambat has various benefits, one of which can be used as an antibacterial. The antibacterial ability of sembung rambat leaves has the potential to be used as a basis for making alternative antibiotics. This study was conducted to determine the value of Minimum Inhibitory Concentration (MIC) and antibacterial acitivity of leaves of sembung rambat (M. micrantha Kunth.) Which is most effective in inhibiting the growth of B. subtilis. The sampling method was done by purposive sampling, the extract was made by maceration with ethanol 96% ratio of 1:10. Test for antibacterial activity using the diffusion disc method. The antibacterial activity test results of 96% ethanol extract of sembung rambat leaves, inhibited the test of the value that was the most effective at inhibiting the growth of B. subtilis at 6 % with a diameter of 4.63 mm. From the results obtained, it can be seen that the leaves extract of sembung rambat has the potential to be used as an alternative plant-based antibiotic","PeriodicalId":399499,"journal":{"name":"Natural Science: Journal of Science and Technology","volume":"19 18","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120844570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Analysis non-poisson systems cases of queuing passenger aircraft at Ahmad Yani Airport 亚尼机场客机排队非泊松系统案例分析

Natural Science: Journal of Science and Technology Pub Date : 2021-05-31 DOI: 10.22487/25411969.2021.v10.i1.15452

Dina Asti Prastiwi, Sugito, Puspita Kartikasari

{"title":"Analysis non-poisson systems cases of queuing passenger aircraft at Ahmad Yani Airport","authors":"Dina Asti Prastiwi, Sugito, Puspita Kartikasari","doi":"10.22487/25411969.2021.v10.i1.15452","DOIUrl":"https://doi.org/10.22487/25411969.2021.v10.i1.15452","url":null,"abstract":"Aircraft are effective transportation compared to land and sea transportation. This causes the growth of demand flow of movement, both passengers and aircraft each time period is always increasing. However, The issues that arise are the issues that arise. Meanwhile, the problems that occur are capacity building. Based on the description above, one example of a queue system that is often encountered in daily life is the transportation service system, for example the plane queue at Ahmad Yani International Airport. Based on observations made while boarding the plane, it is not according to the schedule, which is normal because of the arrival of the plane that is not on time. This causes the airport parking lot to be full or busy and can prevent the arrival of the aircraft. Related to the application of the queue method can overcome the difficulties in standing aircraft parking facilities at Ahmad Yani Airport in Semarang.The results analysis model data of passenger plane queue system at Ahmad Yani International Airport (G / G / 8) : (GD / ∞ / ∞). The non-poisson model of time distribution interval arrivals the normal log and logistic distribution time, servers 8 th queue discipline use FIFO, unlimited service capacity, and unlimited transfer resources","PeriodicalId":399499,"journal":{"name":"Natural Science: Journal of Science and Technology","volume":"199 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133863516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tidal and bathymetry characteristics after the 2018 earthquake and tsunami in Watusampu Waters, Palu Bay, Central Sulawesi 苏拉威西岛中部帕卢湾瓦图桑普水域2018年地震和海啸后的潮汐和测深特征

Natural Science: Journal of Science and Technology Pub Date : 2021-05-31 DOI: 10.22487/25411969.2021.v10.i1.15505

Sabhan Sabhan, Badaruddin, M. Kurniawan, M. Rusydi

引用次数: 0

SAR Modelling life expectancy in Sulawesi Island by using spatial autoregressive (SAR) 利用空间自回归(SAR)模拟苏拉威西岛居民预期寿命

Natural Science: Journal of Science and Technology Pub Date : 2021-05-31 DOI: 10.22487/25411969.2021.v10.i1.15459

Rika Pratiwi, Nur’eni Nur’eni, I. Setiawan

引用次数: 0