检索结果-内蒙古大学图书馆

Evaluation of river water quality by using hierarchical clustering analysis

IOP Conference Series: Earth and Environmental science 2021年第1期896卷

作者： B Warsito S Sumiyati H Yasin H Faridah Department of Statistics Faculty of Sciences and Mathematics Diponegoro University Semarang Indonesia Doctoral Program of Environmental Science School of Postgraduate Studies Diponegoro University Semarang Indonesia Department of Environmental Engineering Faculty of Engineering Diponegoro University Semarang Indonesia

Assessment of water pollution is a critical study because it can affect humans directly. Likewise, river water is widely used for various daily needs. It is important to group rivers according to their classes so that further analysis and action can be carried out. This article discusses the clustering of rivers in several areas in the southeast part of Central Java Province consisting of 14 sampling stations based on several water quality parameters. The pollutant parameters include TSS, electrical conductivity, pH, BOD, COD, and DO. The method used is Hierarchical clustering in which the object grouping begins with grouping two objects with the closest distance being combined into one cluster, and then continues until one cluster is formed consisting of all objects. The results show that five clusters are the ideal choice. Except for electrical conductivity, the parameters observed are dominantly the difference between clusters. Through the formation of river clusters based on their water quality, the characteristics of each cluster and cluster members with high similarity can be identified.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The effect of granular palm shell activated carbon to reduce CO, HC, and noise on motorcycle Emissions

引用

AIP Conference Proceedings 2024年第1期3074卷

作者： Maria Roosa Srah Darmanijati Pranoto Ari Handono Ramelan Inayati Doctoral Program of Environmental Science Department Post Graduate School of Sebelas Maret University Surakarta Indonesia Chemistry Department Mathematic and Natural Science FacultySebelas Maret University Surakarta Indonesia Chemical Engineering Department Chemistry Engineering Sebelas Maret University Surakarta Indonesia

The use of motorcycles increased rapidly. Data from Yogyakarta Central Bureau Statistics showed from 2015 to 2019 the number of motorized vehicles increased by 8% every year. Motor vehicle air pollution comes from exhaust gases resulting from combustion. Becak Motorcycles are widely used in Yogyakarta and are usually used motorcycles with a long life. Hydrocarbons (HC) or unburned fuel and carbon monoxide (CO), were air-fuel control. This research was studied to determine the ability of palm shell activated charcoal to reduce CO, HC and noise. The 14 meshes sample diameter placed inside the tube from 24 meshes of stainless steels were prepared. The weight of activated charcoal of 10 grams, 20 grams and 30 grams were tried to reduce the In the exhaust of a 1984 Suzuki motorcycle with plate number AB 4194 CK, an exhaust extension was installed, then palm activated carbon was placed inside and the emission gases were measured. Stages 898 was used to test the emission. The smallest size could adsorb the largest emissions and noise. The weight of activated charcoal of 10 grams, 20 grams and 30 grams 14 meshes could reduce CO, HC and noise emission were 0.294 % to 0.616 %, 454 ppm to 798 ppm, -o.63 dB to 1.6 dB, respectively. The weight of activated charcoal of 10 grams, 20 grams and 30 grams 14 meshes saturated time were 270 seconds, 173 seconds and 299 seconds, respectively.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Water quality of Maninjau Lake, West Sumatera Province based on pollution and STORET indices

引用

AIP Conference Proceedings 2023年第1期2956卷

作者： Reni Nastuti Tri Retnaningsih Soeprobowati Sudarno Utomo Doctoral Program of Environmental Science School of Postgraduate Studies Diponegoro University Semarang Indonesia Department ofBiology Faculty of Scienceand Mathematics Diponegoro University Semarang. Indonesia Department of Environmental Engineering Faculty of Engineering Diponegoro University Semarang Indonesia

Maninjau Lake can be found in West Sumatra province, specifically in the Tanjung Raya District of the Agam Regency. The Government and the nearsocieties utilize the lake catchment area aimed at agriculture, refreshment, settlement and floating net cages. Increased anthropogenic activity can affect the quality of the lake. This investigation’s goal is to assess Lake Maninjau’s water quality using the Pollution Index (PI) and the Storage and Retrieval (STORET) method. The research was showed at five sampling stations in the Maninjau Lake area from November 2021. The water quality in Maninjau Lake is classified as moderately polluted by the STORET method. Nonetheless, the Maninjau Lake’s water quality falls under different categories according to the PI. From Good condition to Moderately polluted is the range for Class I (in use as a water source for drinking). Lightly to Moderately polluted is Class II (outdoor recreation assets and facilities, fishery, livestock farming, and agricultural uses). Class III, on the other hand (meant for breeding freshwater fish, raising livestock, and watering crops) and Class IV irrigation systems are categorized as Good condition and lightly polluted, respectively.

关键词：

来源：评论

学校读者我要写书评

暂无评论

REPEAT ANALYSIS program AS A QUALITY ASSURANCE SYSTEM FOR RADIOLOGY MANAGEMENT: CAUSAL REPEAT AND AN OVERVIEW

引用

Journal of Medical Imaging and Radiation sciences 2023年第3期54卷 S31-S31页

作者： Rochmayanti, Dwi Adi, Kusworo Widodo, Catur Edi Doctoral Program of Information System School of Postgraduate Diponegoro University Department of Radiodiagnostic and Radiotherapy Engineering Health Polytechnic Ministry of Health Semarang Central Java Department of Physics Faculty of Science and Mathematics Diponegoro University

OBJECTIVEThis paper aims to describe the image retakes program over several decades, and identify the causes of issues due to rejection rates. MATERIALS & METHODSThis study is a literature review using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) method. Articles were searched from Google Scholar (3140) and Scopus (18) using keywords " Reject" or " Repeat" or " Retakes" and " Analysis" and " in" and " Diagnostic" and " Imaging". The article range was expanded to describe the profile of repeat analysis from the use of film-screen to digital transformation systems. Based on the established criteria, 20 articles were extracted and analyzed. RESULTSFrom the literature, it was found that repeat rates above 5% were still found in some examination categories, with chest radiography contributing the highest rejection rate, reaching 51.67%, with the biggest contributing factor being positioning (84.8%). There are interesting findings related to this program, where subjective factors in determining the classification of rejection causes still exist. One study mentioned that AI can predict image rejection accuracy with a sensitivity of 93%. Therefore, the use of AI can be very helpful in classifying rejection causes, making data available for more efficient and easier radiology management. CONCLUSIONRepeat program is part of image quality management. The justification for rejection decisions still poses a challenge related to personnel's subjective factors and determining the causes of rejection/repeat must also be done to obtain concrete data related to radiography performance.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Enhancing the yield and quality of Kemiri Sunan crude oil by preliminary extraction of feedstock

引用

Journal of Physics: Conference Series 2019年第1期1295卷

作者： S Supriyadi P Purwanto P H Hermawan Doctoral Program of Environmental Science School of Postgraduate Studies Diponegoro University Semarang- Indonesia Department of Mechanical Engineering Universitas PGRI Semarang Semarang- Indonesia Department of Chemical Engineering Faculty of Engineering Diponegoro University Semarang Indonesia Department of Electrical Engineering Faculty of Engineering Diponegoro University Semarang – Indonesia

Biodiesel is an alternative fuel produced by chemical reaction between vegetable oil or animal fat with alcohol and catalyst. The preliminary treatment in extraction of biodiesel feedstock is an important process to obtain maximum yield of crude oil. This study aims to find optimal preliminary treatment on extraction of Kemiri Sunan seed in order to produce crude oil with maximum yield and quality. The research investigated the effects of screw press machine rotation and duration of steaming process. Three levels of duration of steaming used were 30, 60 and 90 minutes. Observations of crude oil yield, moisture content, free fatty acid content, kinematic viscosity, density and color were done. The result suggested that the rotation of screw press machine affected the crude oil yield. The duration of steaming process affected the oil yield, free fatty acid content, kinematic viscosity, density and color. The best oil yield result of 70.3% was obtained from the combination of heating duration of 60' and screw rotation of 25 RPM.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Rule of thumb for the calculation of overall transfer thermal value in Bandung

引用

IOP Conference Series: Earth and Environmental science 2021年第1期780卷

作者： L Kusumawati E Setyowati A B Purnomo Lecturer at Department of Architecture Faculty of Civil Engineering and Planning Trisakti University Jakarta Indonesia Student of Doctoral Program in Architecture and Urban Science Diponegoro University Semarang Indonesia Lecturer at Departement of Architecture Faculty of Engineering Diponegoro University Semarang Indonesia

The rule of thumb for heat transfer in building envelopes is made to make it easier to calculate heat transfer using the OTTV formula from SNI. Using this formula, it often makes it difficult for architects to quickly estimate the heat transfer value of a building. The OTTV formula variable issued by SNI is not an architectural design variable. Only one variable that is in accordance with the field of architecture is the window to wall ratio (WWR). The use of the OTTV formula is very dependent on the location of the building and solar radiation. So to overcome this difficulty, the researcher tries to offer a rule of thumb formula for calculating heat transfer. To get the OTTV formula by rule of thumb by means of design variable regression. With the rule of thumb formula for calculating OTTV, it is hoped that it can make it easier for architects to consider designs that are adapted to local conditions.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Multivariate analysis of carcinogenic equivalence (CEQ) to characterize carcinogenic VOC emissions in a typical petrochemical industrial park in Taiwan

引用

Environment International 2024年 186卷 108548页

作者： Chen, Wei-Hsiang Chang, Chin-Fa Lai, Chin-Hsing Peng, Yen-Ping Su, Yu-Jih Chen, Guan-Fu Institute of Environmental Engineering National Sun Yat-sen University Kaohsiung804 Taiwan Aerosol Science and Research Center National Sun Yat-sen University Kaohsiung804 Taiwan Department of Public Health Kaohsiung Medical University Kaohsiung807 Taiwan Master and Doctoral Degree Program in Toxicology Kaohsiung Medical University Kaohsiung807 Taiwan Center for Emerging Contaminants Research National Sun Yat-Sen University Kaohsiung804 Taiwan Department of Environmental Engineering and Science Fooyin University Kaohsiung831 Taiwan College of Medicine Chang Gung University Taoyuan333 Taiwan Department of Internal Medicine Division of Rheumatology Allergy and Immunology Kaohsiung Chang Gung Memorial Hospital Kaohsiung807 Taiwan Center for Mitochondrial Research and Medicine Kaohsiung Chang Gung Memorial Hospital Kaohsiung807 Taiwan Institute of Biopharmaceutical Science National Sun Yat-Sen University Kaohsiung804 Taiwan

Large industrial emissions of volatile organic compounds (VOCs) from the petrochemical industry are a critical concern due to their potential carcinogenicity. VOC emissions vary in composition depending on the source and occur in mixtures containing compounds with varying degrees of toxicity. We proposed the use of carcinogenic equivalence (CEQ) and multivariate analysis to identify the major contributors to the carcinogenicity of VOC emissions. This method weights the carcinogenicity of each VOC by using a ratio of its cancer slope factor to that of benzene, providing a carcinogenic equivalence factor (CEF) for each VOC. We strategically selected a petrochemical industrial park in southern Taiwan that embodies the industry's comprehensive nature and serves as a representative example. The CEQs of different emission sources in three years were analyzed and assessed using principal component analysis (PCA) to characterize the major contributing sectors, vendors, sources, and species for the carcinogenicity of VOC emissions. Results showed that while the study site exhibited a 20.7 % (259.8 t) decrease in total VOC emissions in three years, the total CEQ emission only decreased by 4.5 % (15.9 t), highlighting a potential shift in the emitted VOC composition towards more carcinogenic compounds. By calculating CEQ followed by PCA, the important carcinogenic VOC emission sources and key compounds were identified. More importantly, the study compared three approaches: CEQ followed by PCA, PCA followed by CEQ, and PCA only. While the latter two methods prioritized sources based on emission quantities, potentially overlooking less abundant but highly carcinogenic compounds, the CEQ-first approach effectively identified vendors and sources with the most concerning cancer risks. This distinction underscores the importance of selecting the appropriate analysis method based on the desired focus. Our study highlighted how prioritizing CEQ within the analysis framework empowered

关键词： Principal component analysis

来源：评论

学校读者我要写书评

暂无评论

Digital Dictionary Using Binary Search Algorithm

引用

Journal of Physics: Conference Series 2019年第1期1255卷

作者： Riski Muhamad Fitrian Insan Taufik Muhammad Sabir Ramadhan Neni Mulyani Jeperson Hutahaean Arjon Samuel Sitio Hengki Tamando Sihotang Teknik Informatika STMIK Pelita Nusantara Medan Sumatera Utara Indonesia Doctoral Program Vocational Technology Education Postgraduate Engineering Faculty Padang State University Padang West Sumatera Indonesia Sistem Informasi STMIK Royal Kisaran Sumatera Utara Indonesia Doctoral Program Faculty of Computer Science and Information Technology Universitas Sumatera Utara Medan-Indonesia

Digital Dictionary of Computer and Network engineering can be used in the learning process of computer and nerwork enginering students. Dictionaries are generally book-shaped is hard to carry because of their thick and heavy, now can be accessed anywhere by development of web technology. Digital dictionaries can be accessed through computers, laptops dan cellphones, this is make student easily in learning process. The digital dictionary can not only be used by students of computer and network engineering, but can also by general public, as long as you have an internet connection, anyone can be use this digital dictionaries. The main process in this digital dictionary is the search process. Binary search algorithm used in the search process of binary search algoritm. Binary search algoritm search is applied to word search in this digital dictionary, because this algoritm is intended for sequintal data. program language that will be used to build this digital dictionary is PHP and MySQL.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Empirical testing: The prototyper's evaluation mechanism

引用

NAVAL ENGINEERS JOURNAL 1997年第1期109卷 41-46页

作者： Hafner, AN Arnold N. Hafner Ph.D.:is founder and president of Information Systems Research (ISR). He has twenty-five years of experience in systems development and is published in the field of systems development management. He served as corporate research scientist at Systems Exploration Inc. from 1988 to 1991 program director at Computer Science Corporation from 1983 to 1988 director of operations at Republic Management Systems Corporation from 1981 to 1983 and program manager at Computer Science Corporation from 1972 to 1981. A 1962 graduate of the US. Naval Academy he holds a doctoral degree in human behavior and engineering degrees in electronics and communications. He has taught courses on information systems and systems management at most of the colleges in the San Diego area. Dr. Hafner has presented fourteen refereed research papers while publishing sixteen articles and a book A Manager's Guide to Software System Development.

Evaluating complex systems is the subject of this paper, the third in a series investigating prototyping. It provides an interesting and helpful overview of how to evaluate systems prototypes and outlines the iterative stream of developer-user interactions that is replacing older approaches to testing and evaluating new military systems, which promise to reduce the time required to develop and field future military capabilities. Changes to the acquisition process, such as those the paper sketches, will facilitate the nation's rapid transit through its current revolution in military affairs.

关键词： Systems analysis

来源：评论

学校读者我要写书评

暂无评论

Characteristics of Kemiri Sunan (reutalis trisperma (blanco) airy shaw) biodiesel processed by a one stage transesterification process

引用

IOP Conference Series: Earth and Environmental science 2021年第1期623卷

作者： S Supriyadi P Purwanto H Hermawan D D Anggoro C Carsoni A Mukhtar Department of Mechanical Engineering Universitas PGRI Semarang Semarang Indonesia Doctoral Program of Environmental Science School of Postgraduate Studies Universitas Diponegoro Indonesia Department of Chemical Engineering Faculty of Engineering Universitas Diponegoro Semarang Indonesia Semarang Indonesia Department of Electrical Engineering Faculty of Engineering Universitas Diponegoro Semarang Indonesia

Kemiri sunan (Reutalis trisperma (blanco) airy shaw) is a plant that has the potential to be developed as a biodiesel feedstock in Indonesia because its fruit seeds have several advantages compared to jatropha and palm oil, including its oil content and productivity. The biodiesel production process consists of three stages, namely, esterification, transesterification, and purification. The process requires strong mixing to obtain sufficient contact between the vegetable oil and the catalyst or alcohol, especially at the beginning of the reaction. It is carried out manually in the reaction process through mechanical mixing (stirring) and heating in the transesterification process. Furthermore, biodiesel production process is greatly influenced by the accuracy of concentration and type of catalyst. This study aims to identify the optimal method for the process of biodiesel production from kemiri sunan oil. The research was conducted with a one-stage transesterification to determine the biodiesel yield and quality. The results showed that several biodiesel parameters satisfied the Indonesian National Standard (SNI) for biodiesel (SNI number 7182:2015). However, the kinematic viscosity of biodiesel was still higher than the standard.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：