BERKALA SAINSTEK最新文献

Ants Density of Odontomachus sp. and Its Ecological Role in Kendari City Green Open Space 肯达里市绿色开放空间的蚂蚁密度及其生态作用

BERKALA SAINSTEK Pub Date : 2024-01-02 DOI: 10.19184/bst.v11i4.42681

Hilda Ayu Melvi Amalia, Armadi Chairunnas

引用次数: 0

Synthesis Zeolite Y From Lapindo Mud With Variations Filling Autoclave And Ratio Molar Si/Al 用不同的高压釜填充物和硅/铝摩尔比从拉平多泥中合成沸石 Y

BERKALA SAINSTEK Pub Date : 2023-09-30 DOI: 10.19184/bst.v11i3.39422

Sintesis Zeolit, Y. Dari, Lumpur Lapindo, Dengan Variasi, Keterisian Autoklaf, dan Variasi, Rasio Molar, SiAl, Novita Andarini, Deys Sya’fatul Maziyyah, T. Haryati, Yudi Aris Sulistiyo

引用次数: 0

Comparison of Online and Offline Learning During The COVID-19 Pandemic using Naïve Bayes Method and C4.5 在 COVID-19 大流行期间使用奈伊夫贝叶斯方法和 C4.5 进行在线和离线学习的比较

BERKALA SAINSTEK Pub Date : 2023-09-30 DOI: 10.19184/bst.v11i3.31737

Andini Cahya Aulia, M. Fatekurohman, Made Tirta

引用次数: 0

Co(II)-TiO2/Ti Thin Film as Antibacterial Photocatalysts Escherichia Coli Under Visible Light Ilumination 在可见光照射下作为抗菌光催化剂的 Co(II)-TiO2/Ti 薄膜：大肠杆菌

BERKALA SAINSTEK Pub Date : 2023-09-30 DOI: 10.19184/bst.v11i3.38055

A. B. Aritonang, Nuri Rozaqina, H. Harlia

{"title":"Co(II)-TiO2/Ti Thin Film as Antibacterial Photocatalysts Escherichia Coli Under Visible Light Ilumination","authors":"A. B. Aritonang, Nuri Rozaqina, H. Harlia","doi":"10.19184/bst.v11i3.38055","DOIUrl":"https://doi.org/10.19184/bst.v11i3.38055","url":null,"abstract":"A thin layer of TiO2 doped with Cobalt (II) immobilized on the surface of a titanium foil (Co(II)-TiO2/Ti) has been synthesized from a titanium foil (Ti) as a TiO2 precursor as well as a thin layer matrix and CoCl2.6H2O as a source of Co(II) on variations of 0.5%, 1% and 2%. Synthesis was carried out by anodizing method using ethylene glycol electrolyte solution with the addition of NH4F and followed by calcination treatment at 450ºC for 3 hours. The obtained Co(II)-TiO2 /Ti thin films were characterized using Fourier-transform infrared (FT-IR) spectroscopy, Diffuse Reflectance UV-Vis (DRSUV-Vis) and X-ray diffraction (XRD) methods. Doping Co(II) variations of 0.5%, 1.0% dan 2.0% in the TiO2 structure causes a shift in the vibrational absorption peak of Ti-O (460.99 cm-1) towards a smaller wave number of 459.06 cm-1 respectively ; 453.27 cm-1 and 451.34 cm-1. This is supported by the results of the DRUV-Vis analysis using the tauc plot method, which shows a decrease in the band gap energy of TiO2 (3.24 eV) to 2.57 eV, 2.47 eV and 2.28 eV. Based on XRD analysis, it is known that the Co(II)-TiO2/Ti photocatalyst has anatase phase with a crystal size of 15-17 nm. The photocatalytic activity of Co(II)-TiO2/Ti under visible light illumination was evaluated for inhibition of Escherichia coli bacterial growth. Co(II)-TiO2/Ti photocatalyst at 2.0% Co(II) concentration had the best inhibition (43.2%) compared to 0.5% and 1.0% Co(II) concentrations, respectively 18% inhibition and 27%.","PeriodicalId":353803,"journal":{"name":"BERKALA SAINSTEK","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139332511","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

Production of Photosynthetic Pigments from Spirulina platensis Under Different Light Intensities 不同光照强度下扁平螺旋藻光合色素的产生

BERKALA SAINSTEK Pub Date : 2023-09-30 DOI: 10.19184/bst.v11i3.38474

Pintaka Kusumaningtyas, Sihol Dwijaya, Usman Gultom

{"title":"Production of Photosynthetic Pigments from Spirulina platensis Under Different Light Intensities","authors":"Pintaka Kusumaningtyas, Sihol Dwijaya, Usman Gultom","doi":"10.19184/bst.v11i3.38474","DOIUrl":"https://doi.org/10.19184/bst.v11i3.38474","url":null,"abstract":"Photosynthetic pigments from microalgae have great potential biotechnological applications, as healthy food colorants and cosmetics. The production of photosynthetic pigments depends on many environmental conditions, mainly light intensity during the cultivation period. The present study aimed to determine the productivity of photosynthetic pigments in the biomass of S. platensis, including total chlorophylls, carotenoids, and phycocyanin, under different light intensities: 40 µmol m–2 s–1 (lower light intensity) and 70 µmol m–2 s–1 (higher light intensity). The results showed that S. platensis culture responds to changes in light intensity by changing the composition of photosynthetic pigments as an adaptive mechanism. The higher carotenoids content (69.69 ± 7.47 µg/g dw) was found under high light intensity, meanwhile, the higher chlorophyll (1495.47 ± 279.00 µg/g dw) and phycocyanin (4995.49 ± 576.52 µg/g dw) contents were observed under low light intensity. The highest productivity of photosynthetic pigments in S. platensis was shown by phycocyanin (318.86 ± 44.22 µg/L/day) and cholophylls (95.38 ± 19.35 µg/L/day) which were produced under low light intensity. Our results show that changes in light intensity can contribute to a stronger effect on the productivity of algal pigments for human health benefits and food colorants.","PeriodicalId":353803,"journal":{"name":"BERKALA SAINSTEK","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139333322","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

Potential of Reduction Solid Waste from Office Building (Case Study: Gedung Polda Jambi) 减少办公楼固体废物的潜力（案例研究：Gedung Polda Jambi）

BERKALA SAINSTEK Pub Date : 2023-09-30 DOI: 10.19184/bst.v11i3.36679

Winny Laura, Ira Galih, Anri Lovena

{"title":"Potential of Reduction Solid Waste from Office Building (Case Study: Gedung Polda Jambi)","authors":"Winny Laura, Ira Galih, Anri Lovena","doi":"10.19184/bst.v11i3.36679","DOIUrl":"https://doi.org/10.19184/bst.v11i3.36679","url":null,"abstract":"Solid waste management in building can be managed with the waste management policy and waste management practice tools. It is contained in the concept of green building. The purpose of this study was to analyze the potential reduce of solid waste in office buildings which is managed by waste management policy and waste management practice tools, and provide scheme recommendations for solid waste management for office buildings the object of this study is Jambi Regional Police Office Building. The methodology was a survey method with solid waste sampling (SNI 19-3964-1994) in Building A, Building B, Canteen and Garden Area and Parking The sampling did for 8 days. Quantitative and quantitative parameters were obtained from the calculation of the generation and composition of solid waste, and also interviews. The results for the generation of solid waste on Jambi Regional Police Office Building: 40.40 kg/day or 0.027 kg/person.day (consist of 45% organic, 28% inorganic, 26% paper and B3 0.7% and others 0.3%). Recommendations scheme can be given for solid waste management in the form of the application of waste management practice tools are started from modification of the waste into separate, collection is done as often as possible, solid waste treatment is done composting and sales to waste banks. The potential for reducing solid waste if the waste management policy and practice tools are applied is 85.64% to 5.8 kg/day.","PeriodicalId":353803,"journal":{"name":"BERKALA SAINSTEK","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139332464","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

Utilization of Bendrat Wire fiber on the Mechanical Properties of Geopolymer Concrete 本德拉特钢丝纤维的使用对土工聚合物混凝土力学性能的影响

BERKALA SAINSTEK Pub Date : 2023-09-30 DOI: 10.19184/bst.v11i3.38163

Septian Gusti Sucahyo, Dwi Nurtanto, Nanin Meyfa Utami

引用次数: 0

The Utilization from Glucomannan of Porang Flour (Amorphophallus Muelleri Blume) as a Raw Material for Making an Edible Film 利用茯苓粉（Amorphophallus Muelleri Blume）中的葡甘聚糖作为制作食用薄膜的原料

BERKALA SAINSTEK Pub Date : 2023-09-29 DOI: 10.19184/bst.v11i3.38122

Ismi Nurlatifah, M. Amyranti

引用次数: 0

Effect of Air Humidity in MIG Welded Joints on Tensile Strength and Impact Strength of Aluminum 5052 MIG焊接接头空气湿度对5052铝合金抗拉强度和冲击强度的影响

BERKALA SAINSTEK Pub Date : 2023-06-14 DOI: 10.19184/bst.v11i2.37546

Fandi Bachtiar Nduru, Nur Yanu Nugroho

{"title":"Effect of Air Humidity in MIG Welded Joints on Tensile Strength and Impact Strength of Aluminum 5052","authors":"Fandi Bachtiar Nduru, Nur Yanu Nugroho","doi":"10.19184/bst.v11i2.37546","DOIUrl":"https://doi.org/10.19184/bst.v11i2.37546","url":null,"abstract":"In the shipbuilding process, delays often occur. In general, to speed up a ship's construction, overtime is carried out by workers until nighttime. Environmental conditions in a welding process, especially air humidity, strongly affect the properties of welded joints. The formation of hydrogen in the air caused by an inappropriate environment can cause defects in welded joints, especially porosity defects. Variations of welding environmental conditions used, are welding in the morning at 84% air humidity, daytime welding at 53% air humidity, and nighttime welding at 77% air humidity. This study aims to determine the material strength of air humidity variations during the welding process on the tensile strength and impact strength of 5052 aluminum material. This research uses experimental quantitative methods data analysis techniques used analysis of variance (ANOVA). The results showed that the higher the air humidity, the tensile and impact strength decreased. From the results of the tensile test, there is an influence of air humidity on the average value of tensile strength, where the highest value is found in the daytime welding variation specimen with 53% air humidity, worth 110.614 MPa. From the impact test results, there is an influence of air humidity on the average value of impact toughness, where the highest value is found in the daytime welding variation specimen with 53% air humidity, worth 89.42 J/mm2. From the ANOVA test results, the average tensile test and impact test have no significant differences.","PeriodicalId":353803,"journal":{"name":"BERKALA SAINSTEK","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124601675","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

An Investigation into the Effectiveness of Green Betel (Piper betle L.) Leaf Extract Hand Sanitizer 绿槟榔(Piper betle L.)药效的研究叶提取物洗手液

BERKALA SAINSTEK Pub Date : 2023-06-09 DOI: 10.19184/bst.v11i2.39190

Diyas Aledya Yahya, I. Permatasari, S. Ma’mun

{"title":"An Investigation into the Effectiveness of Green Betel (Piper betle L.) Leaf Extract Hand Sanitizer","authors":"Diyas Aledya Yahya, I. Permatasari, S. Ma’mun","doi":"10.19184/bst.v11i2.39190","DOIUrl":"https://doi.org/10.19184/bst.v11i2.39190","url":null,"abstract":"Green betel (Piper betle L.) leaf contains anti-thrush, anti-cough, astringent, and antiseptic chemicals such as saponins, flavonoids, polyphenols, and essential oils. Hand sanitizer can also be used as an antiseptic agent, which is a more practical option. The purpose of this study was to see how the composition of green betel leaf extract made by infusion affected its physical properties and bacterial inhibition. Hand sanitizer samples were made using different concentrations of green betel leaf extract (10 - 25 wt%) with and without the addition of tea tree essential oil. Sample testing included organoleptic tests, physical properties tests, and effectiveness tests on the growth of Escherichia coli bacteria. The results showed that the best composition was found to be at a concentration of 10 wt% green betel leaf extract without the addition of essential oil, with pH ranging from 5.2 to 5.8 and viscosities ranging from 1.32 to 1.99 cps, in the form of a watery gel and a clear yellow color. Meanwhile, hand sanitizer sensitivity testing revealed that none of the samples could inhibit the growth of Escherichia coli bacteria. This indicates that the concentration of green betel leaf extract in the sample is still insufficient to inhibit bacterial growth.","PeriodicalId":353803,"journal":{"name":"BERKALA SAINSTEK","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130667855","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