Communications in Science and Technology最新文献_第9页

Experimental and numerical investigation of laboratory scale sheetpipe-typed automatic subsurface irrigation 实验室规模板管式自动地下灌溉的试验与数值研究

Communications in Science and Technology Pub Date : 2021-12-31 DOI: 10.21924/cst.6.2.2021.604

S. K. Saptomo, Rudiyanto, M. Askari, C. Arif, W. Suwarno, Adlan, Rusianto, B. Setiawan, K. Tamura, H. Matsuda

引用次数: 2

Microwave-assisted biosynthesis and characterization of ZnO film for photocatalytic application in methylene blue degradation 微波辅助合成ZnO薄膜及其光催化降解亚甲蓝的研究

Communications in Science and Technology Pub Date : 2021-12-31 DOI: 10.21924/cst.6.2.2021.484

Ari Sulistyo Rini, Averin Nabilla, Y. Rati

{"title":"Microwave-assisted biosynthesis and characterization of ZnO film for photocatalytic application in methylene blue degradation","authors":"Ari Sulistyo Rini, Averin Nabilla, Y. Rati","doi":"10.21924/cst.6.2.2021.484","DOIUrl":"https://doi.org/10.21924/cst.6.2.2021.484","url":null,"abstract":"This study aims to investigate the physical characteristics and photocatalyst activity of biosynthesized ZnO with pineapple (Ananas comosus) peel extract under microwave irradiation. The ZnO powder was prepared in two different concentrations of zinc nitrate hexahydrate (ZNH) at 200mM (Z-200) and 500 mM (Z-500). The optical, structural, and morphological properties of ZnO were analyzed using UV-Vis spectroscopy, X-Ray Diffraction (XRD), and Scanning Electron Microscopy (SEM), respectively. The UV-Vis absorption spectrum showed a wide absorbance peak of ZnO at the wavelength of 300-360 nm with a bandgap energy of 3.22 and 3.25 eV. The XRD result confirmed the wurtzite structure of ZnO with high crystallinity. SEM morphology showed spherical particles with an average particle size of 190-220 nm. For photocatalytic application, ZnO film was fabricated via the doctor blade method from microwave-assisted biosynthesized ZnO powder. ZnO films were then applied under UV-irradiation to examine the photocatalytic degradation of methylene blue. It was found that the catalytic behavior of ZnO film was affected by the starting ZNH concentration with maximum effectiveness of 46% degradation after 2 h.","PeriodicalId":36437,"journal":{"name":"Communications in Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47533600","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: 8

The gompertz exponential pareto distribution with the properties and applications to bladder cancer and hydrological datasets 具有性质的gompertz指数帕累托分布及其在膀胱癌症和水文数据集中的应用

Communications in Science and Technology Pub Date : 2021-12-31 DOI: 10.21924/cst.6.2.2021.551

A. O. Adeyemi, E. Akarawak, I. Adeleke

{"title":"The gompertz exponential pareto distribution with the properties and applications to bladder cancer and hydrological datasets","authors":"A. O. Adeyemi, E. Akarawak, I. Adeleke","doi":"10.21924/cst.6.2.2021.551","DOIUrl":"https://doi.org/10.21924/cst.6.2.2021.551","url":null,"abstract":"Many existing distributions in literatures does not have the modeling fits capacity to adequately describe the real-life phenomena. The Exponential Pareto (EP) distribution has further gained some generalizations among several authors using different generator techniques with an aim to obtain a new distribution with greater flexibility. This article proposes Gompertz Exponential Pareto (GEP) distribution using the Gompertz generator. Findings from the study revealed some lifetime distributions as special cases and mathematical properties of the distribution investigated including the mean, variance, coefficient of variation, quantile, moment, moment generating function and, order statistics. The distribution can be positively or negatively skewed. It is unimodal with failure rates whose shapes could be reversed J bathtub, constant, decreasing and, increasing and the parameters were estimated using maximum likelihood estimation approach. Applications to two real-life datasets revealed the ability of GEP distribution to provide more flexibilities and better fit to the dataset compared to some previously proposed distributions for the data. The results also revealed that GEP had the superior performance over other generalizations of EP distribution existing in literatures and the performance has further strengthened the usefulness of the Gompertz-generator technique.","PeriodicalId":36437,"journal":{"name":"Communications in Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47386541","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: 1

Mg/Al-CH, Ni/Al-CH and Zn/Al-CH, as adsorbents for Congo Red removal in aqueous solution Mg/Al-CH、Ni/Al-CH和Zn/Al-CH作为吸附剂去除刚果红

Communications in Science and Technology Pub Date : 2021-12-31 DOI: 10.21924/cst.6.2.2021.547

P. M. S. B. Siregar, Normah, N. Juleanti, A. Wijaya, N. Palapa, R. Mohadi, A. Lesbani

{"title":"Mg/Al-CH, Ni/Al-CH and Zn/Al-CH, as adsorbents for Congo Red removal in aqueous solution","authors":"P. M. S. B. Siregar, Normah, N. Juleanti, A. Wijaya, N. Palapa, R. Mohadi, A. Lesbani","doi":"10.21924/cst.6.2.2021.547","DOIUrl":"https://doi.org/10.21924/cst.6.2.2021.547","url":null,"abstract":"In this study, chitosan was extracted from shrimp shells by demineralization and deproteination processes. The extracted chitosan was used to modify the layered double hydroxide and used as an adsorbent for the removal of congo red from aqueous solutions. Composites were successfully synthesized using M2+/Al (M2+ = Zn, Mg, Ni) and chitosan (CH) and the samples obtained were characterized using XRD and FTIR. The X-ray diffraction (XRD) pattern appeared at the layered double hydroxide peak of 2? = 11.63°; 23.00°; 35.16°; and 61.59° and chitosan at 2? = 7.93° and 19.35. The composite appearing in the layered double hydroxide and chitosan indicated that the composite material has been successfully synthesized. The XRD diffraction patterns of Zn/Al-CH, Ni/Al-CH, and Mg/Al-CH showed low crystallinity. The Fourier Transform Infrared (FTIR) spectra verifying absorption spectrum showed the presence of two bands at 3448 cm-1, 1382cm-1 characteristic to both chitosan and LDH. Adsorption of Congo Red (CR) followed the pseudo-second-order and Langmuir isotherm models. The adsorption capacities of Zn/Al-CH, Ni/Al-CH, and Mg/Al-CH were 181.818 mg/g, 227.273 mg/g, and 344.828 mg/g, respectively. The layered double hydroxide-chitosan composite adsorption was endothermically characterized by positive enthalpy and entropy values. On the other hand, the adsorption spontaneously was characterized by a negative Gibbs free energy value. The composites in this study were formed from LDH modified from chitosan extracted from shrimp shells to form Zn/Al-CH, Ni/Al-CH, and Mg/Al-CH. The results of the characterization showed a number of characteristics that resembled the constituent materials in the form of LDH and chitosan. After being applied as an adsorbent to absorb Congo red dye, it then showed the most effective results using Mg/Al-CH adsorbent with an adsorption capacity of 344.828 mg/g.","PeriodicalId":36437,"journal":{"name":"Communications in Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45780704","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

Benthic habitat classification using multiscale GEOBIA on orthophoto images of Karimunjawa waters 基于Karimunjawa水域正射影像的多尺度GEOBIA底栖生物栖息地分类

Communications in Science and Technology Pub Date : 2021-07-27 DOI: 10.21924/cst.6.1.2021.332

Yahya Dwikarsa, A. Basith

{"title":"Benthic habitat classification using multiscale GEOBIA on orthophoto images of Karimunjawa waters","authors":"Yahya Dwikarsa, A. Basith","doi":"10.21924/cst.6.1.2021.332","DOIUrl":"https://doi.org/10.21924/cst.6.1.2021.332","url":null,"abstract":"The scale value is an important part of the segmentation stage which is part of Object-Based Image Analysis (OBIA). Selection of scale value can determine the size of the object which affects the results of classification accuracy. In addition to setting the scale value (multiscale), selection of machine learning algorithm applied to classify shallow water benthic habitat objects can also determine the success of the classification. Combination of setting scale values and classification algorithms are aimed to get optimal results by examining classification accuracies. This study uses orthophoto images processed from Unmanned Aerial Vehicle (UAV) mission intended to capture benthic habitat in Karimunjawa waters. The classification algorithms used are Support Vector Machine (SVM), Bayes, and K-Nearest Neighbors (KNN). The results of the classification of combination are then tested for accuracy based on the sample and Training Test Area (TTA) masks. The result shows that SVM algorithm with scale of 300 produces the best level of accuracy. While the lowest accuracy is achieved by using SVM algorithm with scale of 100. The result shows that the optimal scale settings in segmenting objects sequentially are 300, 200, and 100","PeriodicalId":36437,"journal":{"name":"Communications in Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43104967","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

Block cipher four implementation on field programmable gate array 分组密码在现场可编程门阵列上的实现

Communications in Science and Technology Pub Date : 2020-12-26 DOI: 10.21924/cst.5.2.2020.184

Yusuf Kurniawan, M. A. Rizqulloh

引用次数: 1

Trends and hot topics in green open space and ecological wisdom research 绿色开放空间与生态智慧研究的趋势与热点

Communications in Science and Technology Pub Date : 2020-12-26 DOI: 10.21924/cst.5.2.2020.203

R. D. Manningtyas, K. Furuya

{"title":"Trends and hot topics in green open space and ecological wisdom research","authors":"R. D. Manningtyas, K. Furuya","doi":"10.21924/cst.5.2.2020.203","DOIUrl":"https://doi.org/10.21924/cst.5.2.2020.203","url":null,"abstract":"Studies on green open space and ecological wisdom have developed over time and are linked to various subjects and impacts. However, both research subjects have developed somewhat independently despite their approaches often achieving a sustainable landscape. This paper proposed a bibliometric analysis of green open space and ecological wisdom research to identify the trends and hot topics on both aspects, then determine a potential topic for future research relating to both subject areas. We collected English research papers from the last decades from the Scopus database using appropriate keywords and analyzed the metadata using VOSviewer program. Then, the text data were extracted from the title and abstract of the document collections using VOSviewer built-in text mining function. The hot topic term was analyzed by calculating the score of the average citation based on their occurrences. Finally, potential research in green open space and ecological wisdom field was determined by overlaying the findings and catching the slice. A total of 283 document collections were analyzed and 75 most relevant terms were found. All the terms were divided into four clusters as a research field: urban green space cluster, environmental quality cluster, sustainable planning cluster, and landscape development cluster. Further, the hot topic analysis found ten keywords that had a high citation impact in document collection and mostly came from a sustainable planning cluster. After overlaying the findings, six terms emerged that have a high potential for future research because of their high citation impact for science.","PeriodicalId":36437,"journal":{"name":"Communications in Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47427134","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: 1

Role of Gd addition on machinability of Al-15%Mg2Si in-situ composite during dry turning Gd对Al-15%Mg2Si原位复合材料干车削加工性能的影响

Communications in Science and Technology Pub Date : 2020-12-26 DOI: 10.21924/cst.5.2.2020.186

I. P. Nanda, H. Ghandvar, M. H. Idris, Auliya Hanif, Andril Arafat

引用次数: 1

Improving multi-class EEG-motor imagery classification using two-stage detection on one-versus-one approach 基于一对一方法的两阶段检测改进多类脑电运动图像分类

Communications in Science and Technology Pub Date : 2020-12-26 DOI: 10.21924/cst.5.2.2020.216

A. Wijaya, T. B. Adji, N. A. Setiawan

引用次数: 2

Kansei engineering approach for developing electric motorcycle 开发电动摩托车的感性工学方法

Communications in Science and Technology Pub Date : 2019-12-30 DOI: 10.21924/cst.4.2.2019.119

D. K. Baroroh, Mya Amalia, N. Lestari

引用次数: 3