Ngudiyono Ngudiyono, N. N. Kencanawati, Rizky Prakarsa
ABSTRACT Self Compaction Concrete (SCC) is concrete that can flow and fill the spaces in the mold without a compaction process in a fresh state. Therefore, it can overcome various problems during the casting of building components, such as reducing construction time and the number of labor for compaction and vibration. It also can reduce noise, increase the density of concrete structural elements in parts that are difficult to reach with a compactor, and increase the quality and strength of concrete structures. The cement production process increases carbon dioxide (CO2) gas emissions. It is necessary to find alternative materials to reduce these negative impacts, namely by utilizing coal-burning waste in the form of fly ash. This research aimed to determine the effect of fly ash and water binder ratio (w/b) on the compressive strength of SCC concrete. The variations of fly ash and w/b in this research were 0%, 20, 15, and 20%, with w/b 0.3, 0.35, and 0.4. Cylindrical specimens 150 mm x 300 mm were tested at the age of 28 days to determine the compressive strength of each variation of the mixture. The results showed that the percentage of fly ash and water binder ratio (w/b) could affect the filling and passing ability of SCC fresh and the compressive strength of SCC concrete. That can be shown the compressive strength of SCC at the proportion of fly ash 15% increase of 33.5% and 21.8% compared to SCC without fly ash (0%). However, at 20% fly ash proportion, the compressive strength tends to decrease but is still higher than SCC without fly ash (0%). Keywords: Self compaction concrete, Fly ash, Water binder ratio, Compressive strength ABSTRAK Beton memadat sendiri adalah beton yang dalam keadaan segar mampu mengalir dan mengisi ruangan di dalam cetakan (bekisting) tanpa proses pemadatan. Sehingga dapat mengatasi berbagai permasalahan selama pengecoran elemen bangunan yaitu mengurangi waktu pelaksanaan konstruksi dan besarnya upah tenaga kerja untuk proses pemadatan dan penggetaran, mengurangi kebisingan, meningkatkan kepadatan bagian elemen struktur beton yang tidak dapat dijangkau oleh alat pemadat dan selanjutnya kualitas serta kekuatan struktur beton secara menyeluruh dapat ditingkatkan. Proses produksi semen mengakibatkan peningkatan emisi gas karbondioksida (CO2) sehingga perlu dicarikan bahan arternatif pengganti untuk mengurangi dampak negatif tersebut yaitu dengan memanfaatkan limbah pembakaran batu bara berupa abu terbang (fly ash). Tujuan penelitian ini adalah untuk mengetahui pengaruh fly ash dan water binder ratio (w/b) terhadap kuat tekan beton Self Compaction Concrete (SCC). Variasi prosentase fly ash dan w/b pada peneltian ini adalah 0, 20, 15, dan 20% dengan w/b 0,3, 0,35, dan 0,4. Benda uji silinder 150 mm x 300 mm diuji pada umur 28 hari untuk mengetahui kuat tekan masing-masing variasi campuran. Hasil penelitian menunjukkan bahwa bahwa persentase fly ash dan water binder ratio (w/b) dapat mempengaruhi kemampuan mengalir (fill
自压实混凝土(SCC)是一种无需压实过程即可在新鲜状态下流动并填充模具内空间的混凝土。因此，它可以克服建筑构件铸造过程中的各种问题，例如减少施工时间和压实和振动的劳动力数量。它还可以降低噪音，增加用压实机难以达到的部分的混凝土结构元件的密度，提高混凝土结构的质量和强度。水泥生产过程增加了二氧化碳(CO2)气体的排放。有必要寻找替代材料来减少这些负面影响，即利用粉煤灰形式的燃煤废物。本研究旨在确定粉煤灰与水胶比(w/b)对SCC混凝土抗压强度的影响。本研究粉煤灰和w/b的变化幅度分别为0%、20%、15%和20%，w/b分别为0.3、0.35和0.4。在28天的龄期对150 mm x 300 mm的圆柱形试样进行测试，以确定每种混合物的抗压强度。结果表明:粉煤灰掺量与水胶比(w/b)对细砂混凝土的充填和通过能力及抗压强度均有影响;结果表明，粉煤灰掺量为15%的SCC抗压强度比不掺粉煤灰的SCC抗压强度分别提高了33.5%和21.8%。当粉煤灰掺量为20%时，抗压强度呈下降趋势，但仍高于不掺粉煤灰的SCC(0%)。关键词:自密实混凝土，粉煤灰，水胶比，抗压强度sehinga dapat mengatasi berbagai permasalahan selama pengecoran element bangunan yitu mengurangi waktu pelaksanaan konstruksi danbesarya upah kerja untuk propmadatan danpenggetaran, mengurangi kebisingan, mengurangi kebisingan, mengurangi kebisingan, mengurangi kebisingan, mengurangi kebisingan, menmenkatkan kepadatan bagian element strktur betan yang tidak dapat dijanjutnya kualitas serta kekuatan strktur beton secara menyeluruh dapat ditingkatkan。工艺产品:mengakibatkan peningkatan排放气体karbondioksida (CO2) seingga perlu dicarikan bahan arternatif pengganti untuk mengurangi dampak负teresbut yitu dengan memanfaatkan limbah pembakaran batu bara berupa abu terbang(粉煤灰)。土娟penelitian ini adalah untuk mengetahui pengaruh粉煤灰与水胶比(w/b)、自压混凝土(SCC)。异丙醇酶粉煤灰掺量为0、20、15、20%，掺量为0、3、0、35、0、4。Benda uji silinder 150 mm x 300 mm diuji pada umur 28 hari untuk mengetahui kuat tekan masing varasi campuran。Hasil penelitian menunjukkan bahwa bahwa表示酶粉煤灰与水粘合剂比(w/b) dapat mempengaruhi kemampuan mengalir(填充能力)dan melewati sela-sela tulangan baja(通过能力)beton segar SCCHal ini ditunjukkan dengan meningkatnya kuat tekan SCC tanpa粉煤灰比例15% mengalami peningkatan sebesar 33,5 dan 21,8 % dibandingkan dengan SCC tanpa粉煤灰(0%)。Akan tetapi pada比例粉煤灰20%，kuan tekan cenderung mengalami penurunan, namun masih lebih tinggi daripada SCC pada粉煤灰0%。Kata kunci: Beton memadat sendiri，粉煤灰，水胶比，Kuat tekan
{"title":"Pemanfaatan Fly Ash sebagai Bahan Subtitusi Parsial Semen pada Beton Memadat Sendiri","authors":"Ngudiyono Ngudiyono, N. N. Kencanawati, Rizky Prakarsa","doi":"10.29122/jtl.v23i1.5130","DOIUrl":"https://doi.org/10.29122/jtl.v23i1.5130","url":null,"abstract":"ABSTRACT \u0000Self Compaction Concrete (SCC) is concrete that can flow and fill the spaces in the mold without a compaction process in a fresh state. Therefore, it can overcome various problems during the casting of building components, such as reducing construction time and the number of labor for compaction and vibration. It also can reduce noise, increase the density of concrete structural elements in parts that are difficult to reach with a compactor, and increase the quality and strength of concrete structures. The cement production process increases carbon dioxide (CO2) gas emissions. It is necessary to find alternative materials to reduce these negative impacts, namely by utilizing coal-burning waste in the form of fly ash. This research aimed to determine the effect of fly ash and water binder ratio (w/b) on the compressive strength of SCC concrete. The variations of fly ash and w/b in this research were 0%, 20, 15, and 20%, with w/b 0.3, 0.35, and 0.4. Cylindrical specimens 150 mm x 300 mm were tested at the age of 28 days to determine the compressive strength of each variation of the mixture. The results showed that the percentage of fly ash and water binder ratio (w/b) could affect the filling and passing ability of SCC fresh and the compressive strength of SCC concrete. That can be shown the compressive strength of SCC at the proportion of fly ash 15% increase of 33.5% and 21.8% compared to SCC without fly ash (0%). However, at 20% fly ash proportion, the compressive strength tends to decrease but is still higher than SCC without fly ash (0%).\u0000Keywords: Self compaction concrete, Fly ash, Water binder ratio, Compressive strength\u0000ABSTRAK \u0000Beton memadat sendiri adalah beton yang dalam keadaan segar mampu mengalir dan mengisi ruangan di dalam cetakan (bekisting) tanpa proses pemadatan. Sehingga dapat mengatasi berbagai permasalahan selama pengecoran elemen bangunan yaitu mengurangi waktu pelaksanaan konstruksi dan besarnya upah tenaga kerja untuk proses pemadatan dan penggetaran, mengurangi kebisingan, meningkatkan kepadatan bagian elemen struktur beton yang tidak dapat dijangkau oleh alat pemadat dan selanjutnya kualitas serta kekuatan struktur beton secara menyeluruh dapat ditingkatkan. Proses produksi semen mengakibatkan peningkatan emisi gas karbondioksida (CO2) sehingga perlu dicarikan bahan arternatif pengganti untuk mengurangi dampak negatif tersebut yaitu dengan memanfaatkan limbah pembakaran batu bara berupa abu terbang (fly ash). Tujuan penelitian ini adalah untuk mengetahui pengaruh fly ash dan water binder ratio (w/b) terhadap kuat tekan beton Self Compaction Concrete (SCC). Variasi prosentase fly ash dan w/b pada peneltian ini adalah 0, 20, 15, dan 20% dengan w/b 0,3, 0,35, dan 0,4. Benda uji silinder 150 mm x 300 mm diuji pada umur 28 hari untuk mengetahui kuat tekan masing-masing variasi campuran. Hasil penelitian menunjukkan bahwa bahwa persentase fly ash dan water binder ratio (w/b) dapat mempengaruhi kemampuan mengalir (fill","PeriodicalId":31853,"journal":{"name":"Jurnal Sains Teknologi Lingkungan","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90082742","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}
I. Nrartha, I. M. Ginarsa, S. Sultan, A. B. Muljono, Warindi Warindi
Teknologi fuzzy tipe 2 (FT2) berkembang sangat pesat dan memasuki bidang stabilitas sistem tenaga listrik. Pembangkit listrik tenaga mikro hidro (PLTMH) dan diesel (PLTD) riskan terhadap gangguan perubahan beban. Studi stabilitas penting dikerjakan untuk memastikan bahwa operasi PLTMH-PLTD tetap stabil ketika dan setelah beban berubah. Maka power system stabilizer (PSS) berbasis FT2 diusulkan untuk perbaikan stabilitas sistem tersebut. FT2PSS didesain dengan input kecepatan rotor dan derivatifnya. Outputnya adalah sinyal stabilitas yang diumpankan pada sistem eksitasi. Hasilnya, FT2PSS mampu mereduksi overshoot -0,035 deg. Sedangkan overshoot untuk CPSS adalah -0,051 deg. FT2PSS juga dapat mempersingkat settling time dan mempercepat steady state. Stabilitas PLTMH-PLTD yang dilengkapi dengan FT2PSS diperbaiki secara significan.
{"title":"Aplikasi Fuzzy Type-2 PSS untuk Perbaikan Stabilitas Dinamik Pembangkit Listrik Tenaga Mikro Hidro dan Diesel","authors":"I. Nrartha, I. M. Ginarsa, S. Sultan, A. B. Muljono, Warindi Warindi","doi":"10.29303/jstl.v7i2.272","DOIUrl":"https://doi.org/10.29303/jstl.v7i2.272","url":null,"abstract":"Teknologi fuzzy tipe 2 (FT2) berkembang sangat pesat dan memasuki bidang stabilitas sistem tenaga listrik. Pembangkit listrik tenaga mikro hidro (PLTMH) dan diesel (PLTD) riskan terhadap gangguan perubahan beban. Studi stabilitas penting dikerjakan untuk memastikan bahwa operasi PLTMH-PLTD tetap stabil ketika dan setelah beban berubah. Maka power system stabilizer (PSS) berbasis FT2 diusulkan untuk perbaikan stabilitas sistem tersebut. FT2PSS didesain dengan input kecepatan rotor dan derivatifnya. Outputnya adalah sinyal stabilitas yang diumpankan pada sistem eksitasi. Hasilnya, FT2PSS mampu mereduksi overshoot -0,035 deg. Sedangkan overshoot untuk CPSS adalah -0,051 deg. FT2PSS juga dapat mempersingkat settling time dan mempercepat steady state. Stabilitas PLTMH-PLTD yang dilengkapi dengan FT2PSS diperbaiki secara significan.","PeriodicalId":31853,"journal":{"name":"Jurnal Sains Teknologi Lingkungan","volume":"10 5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81247491","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}
Faturrahman Faturrahman, S. Sukiman, B. F. Suryadi, Sarkono Sarkono, E. Hidayati
The use of antibiotics is one of the most important ways to deal with the spread and treatment of pathogenic microbial infections. The search for new antibiotic sources continues to be carried out to anticipate the emergence of microbial resistance. One of the natural resources that has the potential as an antimicrobial source is a member of the macrofungi of the Genus Ganoderma. The purpose of this study was to evaluate the antimicrobial performance of the ethanol extracts of Ganoderma lucidum, G. applanatum dan Ganorderma sp. against fungi (Candida albicans dan Cryptococcus neoformans), gram positive bacteria (Bacillus cereus dan Staphylococcus aureus) and gram negative bacteria (Escherichia coli dan Shigella sp.). Macrofungi samples were taken from the forest area of Nature Tourism Park (TWA) Gunung Tunak, TWA Kerandangan, TWA Suranadi, TWA Nuraksa Sesaot, TWA Lemor and Pusuk forest. The stages of the method performed are sample collection, sample preparation, extraction, and testing of antimicrobial activity using the well difusion method. The ethanol extract concentrations for testing were 20%, 40%, 60% and 80%. The results showed that the three Ganoderma species had anti-fungal and antibacterial activity and that different levels of concentration had an effect on inhibition. The size of the inhibition zone is directly proportional to the higher the extract concentration. The antimicrobial activity of the ethanol extract of G. lucidum was higher when compared to G. applanatum and Ganoderma sp. both against fungi (Candida albicans and Cryptococcus neoformans) as well as against gram-positive and gram-negative test bacteria. In addition, G. applanatum showed very weak inhibition against both groups of tested bacteria. Key words: candidiasis; cryptococcosis; comorbid infections; macerations; pathogens
抗生素的使用是应对病原微生物感染传播和治疗的最重要方法之一。继续寻找新的抗生素来源，以预测微生物耐药性的出现。天然资源之一，具有潜在的抗菌来源是一个成员的大型真菌属灵芝。本研究旨在评价灵芝、扁桃和灵芝乙醇提取物对真菌(白色念珠菌和新型隐球菌)、革兰氏阳性菌(蜡样芽孢杆菌和金黄色葡萄球菌)和革兰氏阴性菌(大肠杆菌和志贺氏菌)的抑菌性能。大型真菌样本采集于自然旅游公园(TWA) Gunung Tunak、TWA Kerandangan、TWA Suranadi、TWA Nuraksa Sesaot、TWA Lemor和Pusuk森林林区。所执行的方法的阶段是样品收集、样品制备、提取和使用孔扩散法检测抗菌活性。乙醇提取物浓度分别为20%、40%、60%和80%。结果表明，三种灵芝均具有抗真菌和抗菌活性，且不同浓度对其抑菌效果有不同程度的影响。抑制带的大小与萃取物浓度越高成正比。灵芝乙醇提取物对真菌(白色念珠菌和新型隐球菌)以及革兰氏阳性和革兰氏阴性试验菌的抑菌活性均高于扁桃和灵芝。此外，青藤对两组细菌的抑制作用都很弱。关键词:念珠菌病;隐球菌病;共病感染;浸渍;病原体
{"title":"Perbandingan Aktivitas Antimikroba Ekstrak Etanol dari Tiga Spesies Ganoderma Asal Pulau Lombok","authors":"Faturrahman Faturrahman, S. Sukiman, B. F. Suryadi, Sarkono Sarkono, E. Hidayati","doi":"10.29303/jstl.v7i2.282","DOIUrl":"https://doi.org/10.29303/jstl.v7i2.282","url":null,"abstract":"The use of antibiotics is one of the most important ways to deal with the spread and treatment of pathogenic microbial infections. The search for new antibiotic sources continues to be carried out to anticipate the emergence of microbial resistance. One of the natural resources that has the potential as an antimicrobial source is a member of the macrofungi of the Genus Ganoderma. The purpose of this study was to evaluate the antimicrobial performance of the ethanol extracts of Ganoderma lucidum, G. applanatum dan Ganorderma sp. against fungi (Candida albicans dan Cryptococcus neoformans), gram positive bacteria (Bacillus cereus dan Staphylococcus aureus) and gram negative bacteria (Escherichia coli dan Shigella sp.). Macrofungi samples were taken from the forest area of Nature Tourism Park (TWA) Gunung Tunak, TWA Kerandangan, TWA Suranadi, TWA Nuraksa Sesaot, TWA Lemor and Pusuk forest. The stages of the method performed are sample collection, sample preparation, extraction, and testing of antimicrobial activity using the well difusion method. The ethanol extract concentrations for testing were 20%, 40%, 60% and 80%. The results showed that the three Ganoderma species had anti-fungal and antibacterial activity and that different levels of concentration had an effect on inhibition. The size of the inhibition zone is directly proportional to the higher the extract concentration. The antimicrobial activity of the ethanol extract of G. lucidum was higher when compared to G. applanatum and Ganoderma sp. both against fungi (Candida albicans and Cryptococcus neoformans) as well as against gram-positive and gram-negative test bacteria. In addition, G. applanatum showed very weak inhibition against both groups of tested bacteria.\u0000 Key words: candidiasis; cryptococcosis; comorbid infections; macerations; pathogens","PeriodicalId":31853,"journal":{"name":"Jurnal Sains Teknologi Lingkungan","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87050788","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}
Diarrhea is an increased frequency and decreased consistency of stool when compared to normal individuals. Giving chemical medicine which consumed continuously, can cause negative side effects for the body. So it takes an effort to find sources of anti-diarrheal medicine that minimize side effects to the body. One source of medicine that can reduce side effects on the body is traditional medicine from local plants. One of the efforts to find a new source of anti-diarrheal medicine is to use tamarind leaves (Tamarindus indica L.) which will be developed into an anti-diarrheal bioagent. This study aims to determine the effectiveness of giving water extract of tamarind leaves (Tamarindus indica L.) fresh old leaves and young leaves to the experimental male Mus musculuus diarrhea positive. This research used three stages of research, namely the preparation of fresh old leaves and young leaves tamarind (Tamarindicus indica L.) leaf water extract, extract testing using 1% FeCl3 and UV-VIS spectrophotometer and testing using male Mus muscullus experimental animals. The results of this study indicate that the tannin content contained in the water extract of tamarind leaves (Tamarindus indica L.) is higher based on testing using 1% FeCl3 and UV-VIS septrophotometer and is more effective in overcoming diarrhea in experimental animals Mus muscullus based on changes in fecal consistency animal try to the Mus muscullus. Key words: diarrhea; tannins; tamarind; water extract
{"title":"Potensi Limbah Daun Asam Jawa (Tamarandus Indica L.) Sebagai Teh Antidiare","authors":"Dwi Kartika Risfianty, Irna Il Sanuriza","doi":"10.29303/jstl.v7i2.288","DOIUrl":"https://doi.org/10.29303/jstl.v7i2.288","url":null,"abstract":"Diarrhea is an increased frequency and decreased consistency of stool when compared to normal individuals. Giving chemical medicine which consumed continuously, can cause negative side effects for the body. So it takes an effort to find sources of anti-diarrheal medicine that minimize side effects to the body. One source of medicine that can reduce side effects on the body is traditional medicine from local plants. One of the efforts to find a new source of anti-diarrheal medicine is to use tamarind leaves (Tamarindus indica L.) which will be developed into an anti-diarrheal bioagent. This study aims to determine the effectiveness of giving water extract of tamarind leaves (Tamarindus indica L.) fresh old leaves and young leaves to the experimental male Mus musculuus diarrhea positive. This research used three stages of research, namely the preparation of fresh old leaves and young leaves tamarind (Tamarindicus indica L.) leaf water extract, extract testing using 1% FeCl3 and UV-VIS spectrophotometer and testing using male Mus muscullus experimental animals. The results of this study indicate that the tannin content contained in the water extract of tamarind leaves (Tamarindus indica L.) is higher based on testing using 1% FeCl3 and UV-VIS septrophotometer and is more effective in overcoming diarrhea in experimental animals Mus muscullus based on changes in fecal consistency animal try to the Mus muscullus.\u0000 Key words: diarrhea; tannins; tamarind; water extract","PeriodicalId":31853,"journal":{"name":"Jurnal Sains Teknologi Lingkungan","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82038195","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}
Made Sutha Yadnya, Ni Luh Sinar Ayu Ratna Dewi, S. M. A. Sasongko, Rosmaliati Rosmaliati, Abdulah Zainuddin
In the covid-19 condition, lectures at the Department of Electrical Engineering, Mataram University changed from a face-to-face process to via the Internet. T here will be a very sharp increase in demand. The use of data initially provided by the University of Mataram using a free hotspot network turned into a burden on lecturers and students. This research was conducted by sampling, general compulsory subjects, compulsory electrical courses, and compulsory expertise subjects. The distribution of variations of students domiciled in the City of Mataram and the other place coverage Lombok Island, within NTB and outside NTB. The results obtained are as follows: students who still survive in Mataram City are 17% (10.5 GB), Lombok Island 48% (8.1 GB), outside Lonbok Island 27% (4.8 GB), and outside NTB 8% (15 GB). Keyword : covid-19; lectures; online
{"title":"Prediksi Kebutuhan Data Mahasiswa Untuk Kuliah Daring Kondisi Covid-19 Di Jurusan Teknik Elektro Universitas Mataram","authors":"Made Sutha Yadnya, Ni Luh Sinar Ayu Ratna Dewi, S. M. A. Sasongko, Rosmaliati Rosmaliati, Abdulah Zainuddin","doi":"10.29303/jstl.v7i2.284","DOIUrl":"https://doi.org/10.29303/jstl.v7i2.284","url":null,"abstract":"In the covid-19 condition, lectures at the Department of Electrical Engineering, Mataram University changed from a face-to-face process to via the Internet. T here will be a very sharp increase in demand. The use of data initially provided by the University of Mataram using a free hotspot network turned into a burden on lecturers and students. This research was conducted by sampling, general compulsory subjects, compulsory electrical courses, and compulsory expertise subjects. The distribution of variations of students domiciled in the City of Mataram and the other place coverage Lombok Island, within NTB and outside NTB. The results obtained are as follows: students who still survive in Mataram City are 17% (10.5 GB), Lombok Island 48% (8.1 GB), outside Lonbok Island 27% (4.8 GB), and outside NTB 8% (15 GB).\u0000Keyword : covid-19; lectures; online","PeriodicalId":31853,"journal":{"name":"Jurnal Sains Teknologi Lingkungan","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87433100","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}
The occurrence of landslides can not be separated from conditions that are prone to landslide movements such as steep slopes and high rainfall. The occurrence of landslides is also exacerbated by the indiscipline of the community in using land according to its function, which is called land conversion which can be a trigger factor for landslides. Conducting research on land use change is important to see the impact caused by human activities. The purpose of this study was to analyze the effect of land conversion on landslide hazard levels in Samigaluh District, Kulon Progo Regency. The method in this research was descriptive quantitative using primary data, namely field surveys and secondary data collection. The steps on this research were conducting field observations about the occurrence of land conversion and then retrieving level of landslide hazard at the observation point of land use change. Data analysis was performed using ordinal logistic regression. The result of the analysis showed that the p value (0.036) <0.05 which meant H0 was rejected. Thus, at the 95% confidence level it could be said that the variable of land use change affected the level of landslide hazard in Samigaluh District, Kulon Progo Regency. This output could be considered for the community to use the land according to its function. Key words: Land Function Change; Landslide; Ordinal
{"title":"Analisis Alih Fungsi Lahan Menggunakan Regresi Logistik Ordinal","authors":"A. Apriani, Bayurohman Pangacella Putra","doi":"10.29303/jstl.v7i2.227","DOIUrl":"https://doi.org/10.29303/jstl.v7i2.227","url":null,"abstract":"The occurrence of landslides can not be separated from conditions that are prone to landslide movements such as steep slopes and high rainfall. The occurrence of landslides is also exacerbated by the indiscipline of the community in using land according to its function, which is called land conversion which can be a trigger factor for landslides. Conducting research on land use change is important to see the impact caused by human activities. The purpose of this study was to analyze the effect of land conversion on landslide hazard levels in Samigaluh District, Kulon Progo Regency. The method in this research was descriptive quantitative using primary data, namely field surveys and secondary data collection. The steps on this research were conducting field observations about the occurrence of land conversion and then retrieving level of landslide hazard at the observation point of land use change. Data analysis was performed using ordinal logistic regression. The result of the analysis showed that the p value (0.036) <0.05 which meant H0 was rejected. Thus, at the 95% confidence level it could be said that the variable of land use change affected the level of landslide hazard in Samigaluh District, Kulon Progo Regency. This output could be considered for the community to use the land according to its function.\u0000 Key words: Land Function Change; Landslide; Ordinal","PeriodicalId":31853,"journal":{"name":"Jurnal Sains Teknologi Lingkungan","volume":"38 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72483284","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}
High input of chemical fertilizer causes land degradation on agriculture. This research is experimental which aims to analyze degree of acidity and macro-nutrients in mussel shell, and analyze chemical properties of soil before and after application of mussel shell suplement. The research was conducted during July to September 2020 at BPTP Laboratory, Narmada West Lombok. Data were analyzed descriptively. The results showed that mussel shell (Pilsbryocomcha excilis) had pH and macro-nutrients potential as an ecofertilizer. Soil chemical properties increase after application of mussel shell (Pilsbryocomcha excilis) supplement. Key words: mussel; shell; soil enhancer; suplement
{"title":"Potensi Suplemen Kerang Kijing (Pilsbryocomcha excilis) Sebagai Pupuk Alami Ramah Lingkungan","authors":"Irna Il Sanuriza, Dwi Kartika Risfianty","doi":"10.29303/jstl.v7i2.190","DOIUrl":"https://doi.org/10.29303/jstl.v7i2.190","url":null,"abstract":"High input of chemical fertilizer causes land degradation on agriculture. This research is experimental which aims to analyze degree of acidity and macro-nutrients in mussel shell, and analyze chemical properties of soil before and after application of mussel shell suplement. The research was conducted during July to September 2020 at BPTP Laboratory, Narmada West Lombok. Data were analyzed descriptively. The results showed that mussel shell (Pilsbryocomcha excilis) had pH and macro-nutrients potential as an ecofertilizer. Soil chemical properties increase after application of mussel shell (Pilsbryocomcha excilis) supplement.\u0000Key words: mussel; shell; soil enhancer; suplement","PeriodicalId":31853,"journal":{"name":"Jurnal Sains Teknologi Lingkungan","volume":"79 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87317228","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}
I. Jaya, Bambang Budi Santoso, Jayaputra Jayaputra
The use of high doses of chemical fertilizers in the production of chili (Capsicum annuum L.) has an adverse impact on the environment, especially in dryland. This study aimed to examine the role of cow manure (PKS), goat manure (PKK), chicken manure (PKA), or a combination of two manures in reducing 25% of the requirement for chemical fertilizer on chili plants. One experiment was carried out in the dryland of Gumantar Village, North Lombok Regency, from May to October 2021. Phonska NPK (15-15-15) chemical fertilizer (PK) at a 1,200 kg/ha dose was used as a control. The treatments tested were 75% PK+PKS, 75% PK+PKK, 75% PK+PKA, 75% PK+PKS+PKK, 75% PK+PKS+PKA and 75% PK+PKK+PKA. The dose of manure used in each treatment was 20 tons/ha. All treatments were repeated three times and arranged in a randomized block design. The results showed that the treatment of manure, especially goat manure and chicken manure, increased the available phosphate (P) in the soil. The growth and yield of chili plants were not significantly different in all treatments, which means that manure could replace the role of 25% of the chemical fertilizer used. These results indicate that manure in the long term can reduce the need for chemical fertilizers to produce chili in dryland. Key words: chili; dryland; manure; chemical fertilizer; nutrition
{"title":"Perlakuan Pupuk Kandang Untuk Mengurangi Dosis Pupuk Kimia Pada Budidaya Tanaman Cabai (Capsicum annuum L.)","authors":"I. Jaya, Bambang Budi Santoso, Jayaputra Jayaputra","doi":"10.29303/jstl.v7i2.294","DOIUrl":"https://doi.org/10.29303/jstl.v7i2.294","url":null,"abstract":"The use of high doses of chemical fertilizers in the production of chili (Capsicum annuum L.) has an adverse impact on the environment, especially in dryland. This study aimed to examine the role of cow manure (PKS), goat manure (PKK), chicken manure (PKA), or a combination of two manures in reducing 25% of the requirement for chemical fertilizer on chili plants. One experiment was carried out in the dryland of Gumantar Village, North Lombok Regency, from May to October 2021. Phonska NPK (15-15-15) chemical fertilizer (PK) at a 1,200 kg/ha dose was used as a control. The treatments tested were 75% PK+PKS, 75% PK+PKK, 75% PK+PKA, 75% PK+PKS+PKK, 75% PK+PKS+PKA and 75% PK+PKK+PKA. The dose of manure used in each treatment was 20 tons/ha. All treatments were repeated three times and arranged in a randomized block design. The results showed that the treatment of manure, especially goat manure and chicken manure, increased the available phosphate (P) in the soil. The growth and yield of chili plants were not significantly different in all treatments, which means that manure could replace the role of 25% of the chemical fertilizer used. These results indicate that manure in the long term can reduce the need for chemical fertilizers to produce chili in dryland. \u0000 Key words: chili; dryland; manure; chemical fertilizer; nutrition","PeriodicalId":31853,"journal":{"name":"Jurnal Sains Teknologi Lingkungan","volume":"23 1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87302963","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}
Humairo Saidah, A. Setiawan, Lilik Hanifah, Eko Pradjoko, Agus Suroso
This study aims to evaluate the ability of the ECHAM5 GCM model output data in estimating monthly rainfall on the island of Lombok. The data used in this study are ECHAM5 monthly rainfall data and automatic rainfall recorder (ARR) measurement rain data for 2000-2018 obtained from ARR Gunung Sari. Correction of bias is conducted by using the mean ratio method and the regression method. The method that produces the best approach is then used to obtain rain data projections and a simple regression method. Evaluation and validation used the Pearson correlation coefficient (r), Root Mean Square Error (RMSE) and Nash-Sutcliffe Efficiency (NSE) values. The results obtained are that the daily and monthly rainfall data from the ECHAM5 model cannot be directly used to replace the rain measurement data because of its very low accuracy. The downscaling technique performed on daily and monthly rainfall data using the average ratio method does not show satisfactory performance where the efficiency figures produced are still low even gave a slight increasing number. However, the ECHAM5 model data can be used to obtain rainfall projections on a monthly and seasonal scale with a good and satisfactory correlation. Key words: mean ratio method; global climate model; ECHAM5; monthly rainfall.
本研究旨在评估ECHAM5 GCM模式输出资料估算龙目岛月降雨量的能力。本研究使用的数据是ECHAM5月降雨量数据和从ARR Gunung Sari获得的2000-2018年自动降雨记录仪(ARR)测量降雨量数据。采用均值比法和回归法对偏差进行校正。然后使用产生最佳方法的方法来获得降雨数据预测和简单的回归方法。使用Pearson相关系数(r)、均方根误差(RMSE)和Nash-Sutcliffe效率(NSE)值进行评价和验证。结果表明，由于ECHAM5模式的日、月降水数据精度较低，不能直接用于替代雨量测量数据。使用平均比率法对日和月降雨量数据进行降尺度技术的表现并不令人满意，即使在数据略有增加的情况下，所产生的效率数字仍然很低。然而，ECHAM5模式数据可用于获得月和季节尺度的降水预估，相关性良好且令人满意。关键词:平均比率法;全球气候模式;ECHAM5;月降雨。
{"title":"Koreksi Bias Data Hujan Luaran GCM ECHAM5 Untuk Prediksi Curah Hujan Bulanan dan Musiman Pulau Lombok","authors":"Humairo Saidah, A. Setiawan, Lilik Hanifah, Eko Pradjoko, Agus Suroso","doi":"10.29303/jstl.v7i2.289","DOIUrl":"https://doi.org/10.29303/jstl.v7i2.289","url":null,"abstract":"This study aims to evaluate the ability of the ECHAM5 GCM model output data in estimating monthly rainfall on the island of Lombok. The data used in this study are ECHAM5 monthly rainfall data and automatic rainfall recorder (ARR) measurement rain data for 2000-2018 obtained from ARR Gunung Sari. Correction of bias is conducted by using the mean ratio method and the regression method. The method that produces the best approach is then used to obtain rain data projections and a simple regression method. Evaluation and validation used the Pearson correlation coefficient (r), Root Mean Square Error (RMSE) and Nash-Sutcliffe Efficiency (NSE) values. The results obtained are that the daily and monthly rainfall data from the ECHAM5 model cannot be directly used to replace the rain measurement data because of its very low accuracy. The downscaling technique performed on daily and monthly rainfall data using the average ratio method does not show satisfactory performance where the efficiency figures produced are still low even gave a slight increasing number. However, the ECHAM5 model data can be used to obtain rainfall projections on a monthly and seasonal scale with a good and satisfactory correlation.\u0000 Key words: mean ratio method; global climate model; ECHAM5; monthly rainfall.","PeriodicalId":31853,"journal":{"name":"Jurnal Sains Teknologi Lingkungan","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84561036","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}
I. W. Sudika, I. W. Sutresna, Dwi Ratna Anugrahwati, Lestari Ujianto
This study was aimed to determine the average of leaf angle, yield and harvest age of each F2 line compared to the two parents respectively. In addition, we also want to evaluate the coefficient of genetic diversity and heritability of the three traits. The experiment was designed in a randomized block design with a total treatment of 20 populations, namely 16 F2 lines and 4 parents. Each treatment was repeated 3 times, so that 60 experimental units were obtained. The experimental data were analyzed by analysis of variance at the 5 percent significance level and further tests using the Least Significant Difference at the same significance level. The results showed that the F2 P8IS x T1NK7328 (R16), F2 P8IS x T1NK7328 (R18) lines, and the F2 P8IS x NK212 (R4) lines, had leaf angles same as each parent of the first hybrid/hybrid offspring (T1NK7328 and NK212) and smaller than the Sinta Unram. The harvest time of the three F2 lines was classified as super early. Yield (weight of dry seeds per plot) of F2 P8IS x T1NK7328 (R16), F2 P8IS x T1NK7328 (R18) lines, were the same as both parents and F2 P8IS x NK212 (R4) lines, higher than Sinta Unram; but the same as the hybrid parent (NK212). Coefficient of genetic diversity of yield is high; medium for harvest time and low for leaf angle. Heritability in broad sense is classified as high, obtained at harvest time and yield; while the heritability of leaf angle is low. The three F2 lines can be used as basic population material for subsequent breeding activities. Key words: hybridization; Sinta Unram; yield; leaf angle
{"title":"Kajian Sifat Kuantitatif Galur F2 Tanaman Jagung di Lahan Kering","authors":"I. W. Sudika, I. W. Sutresna, Dwi Ratna Anugrahwati, Lestari Ujianto","doi":"10.29303/jstl.v7i2.278","DOIUrl":"https://doi.org/10.29303/jstl.v7i2.278","url":null,"abstract":"This study was aimed to determine the average of leaf angle, yield and harvest age of each F2 line compared to the two parents respectively. In addition, we also want to evaluate the coefficient of genetic diversity and heritability of the three traits. The experiment was designed in a randomized block design with a total treatment of 20 populations, namely 16 F2 lines and 4 parents. Each treatment was repeated 3 times, so that 60 experimental units were obtained. The experimental data were analyzed by analysis of variance at the 5 percent significance level and further tests using the Least Significant Difference at the same significance level. The results showed that the F2 P8IS x T1NK7328 (R16), F2 P8IS x T1NK7328 (R18) lines, and the F2 P8IS x NK212 (R4) lines, had leaf angles same as each parent of the first hybrid/hybrid offspring (T1NK7328 and NK212) and smaller than the Sinta Unram. The harvest time of the three F2 lines was classified as super early. Yield (weight of dry seeds per plot) of F2 P8IS x T1NK7328 (R16), F2 P8IS x T1NK7328 (R18) lines, were the same as both parents and F2 P8IS x NK212 (R4) lines, higher than Sinta Unram; but the same as the hybrid parent (NK212). Coefficient of genetic diversity of yield is high; medium for harvest time and low for leaf angle. Heritability in broad sense is classified as high, obtained at harvest time and yield; while the heritability of leaf angle is low. The three F2 lines can be used as basic population material for subsequent breeding activities.\u0000Key words: hybridization; Sinta Unram; yield; leaf angle","PeriodicalId":31853,"journal":{"name":"Jurnal Sains Teknologi Lingkungan","volume":"69 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84145740","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}
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