检索结果-内蒙古大学图书馆

Experimental and simulation study of carbon capture in medical waste fluidized bed combustion

AIP Conference Proceedings 2024年第1期2891卷

作者： I. Made Bagus Panji Aditya I. Nyoman Suprapta Winaya I. Wayan Arya Darma Rukmi Sari Hartati Magister Study Program of Mechanical Engineering Engineering Faculty-University of Udayana Denpasar Bali 80362 Indonesia Study Program of Mechanical Engineering Engineering Faculty-University of Udayana Denpasar Bali 80362 Indonesia Study Program of Electrical Engineering Engineering Faculty-University of Udayana Kampus Bukit Jimbaran Denpasar Bali 80362 Indonesia

During the Covid-19 pandemic, the use of health services has increased significantly, therefore, the production of medical waste also experienced a high increase. The most appropriate and suitable technology to destroy medical waste is incineration or combustion technology, one of which is fluidized bed combustion (FBC). In addition, the FBC technique can also reduce hydrocarbon gases resulting from combustion so as to reduce dioxins into the environment. The reduction in carbon gas during combustion is caused by the absorbent used as a bed material for fluidization process. This study used alumina sand bed material with variations in diameter of 0.2 mm, 0.5 mm, 0.8 mm and 1.1 mm. This research was conducted with an experimental approach method using a laboratory scale FBC reactor and modeling using the Barracuda Virtual Reactor Computational Particle Fluid Dynamics (CPFD) software simulation. The results of this study indicate that alumina sand with a diameter of 0.2 mm has ability to capture more carbon than other sand diameter variations. Based on the simulation, the variation of the 0.2 mm diameter also shows the best solid mixing results due to the relationship between the fluidization movement of the bed material in the reactor and the bed material’s ability to reach the highest up to 50 cm from the bottom of the reactor in the 60th second simulation.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Application of VLAB-Based STEM in The Direct Circuit Electricity Section

引用

Journal of Physics: Conference Series 2020年第5期1477卷

作者： A Rachmat ED Jannati D Susandi I Kaniawati P Siahaan Mechanical Engineering Study Program Universitas Majalengka Industry Engineering Study Program Universitas Majalengka Department of Physics Education Universitas Pendidikan Indonesia Bandung Indonesia

Our research aims to determine the results of student responses after applying VLAB-based STEM learning in the direct current electric circuit section. This study uses a qualitative method. Sampling using a purposive sampling technique. The sample consisted of 13 students of mechanical engineering study program at Universitas Majalengka. The sample consisted of 13 students of mechanical engineering study program at Universitas Majalengka.. Data collection techniques using student questionnaire responses. The results of the questionnaire were analyzed descriptively. Most students respond like VLAB-based STEM, the stages of learning provide learning experiences for students so students are motivated in learning.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The effect of sea water corrosion on tensile strength of combination welded joint of stainless steel 304-201

引用

IOP Conference Series: Materials Science and engineering 2020年第1期1007卷

作者： Tjokorda Gde Tirta Nindhia I Wayan Surata I Wayan Bandem Adnyana I Gusti Komang Dwijana Study Program of Mechanical engineering Engineering faculty Udayana University JimbaranBali Indonesia 80361

Construction installations built with stainless steel are the main choice of the list of materials that can be used for construction near the sea. With the recent discovery of tungsten inert gas (TIG) technology, construction with stainless steel can be realized. In some cases stainless steel welding joints are made by connecting with stainless steel of different types without regard to the strength generated especially if experiencing corrosion in this case corrosion due to sea water. In this study the tensile strength of stainless steel combination joints of type 304-201 was tested and compared with similar joints of types 304-304 and 201-201. The effect of seawater corrosion on the tensile strength of stainless steel joints was also examined. This research found that the highest tensile strength is 304-304 joints followed by 304-201 combination connections and the lowest is 201-201 joints. The effect of seawater corrosion is known to reduce the tensile strength of all types of joints.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Effect of Temperature on Gasification of Biomass Using Zeolit

引用

Journal of Physics: Conference Series 2021年第1期1845卷

作者： H Porawati A Kurniawan E Yuliwati Study Program of Mechanical Engineering Politeknik Jambi Jambi Indonesia Graduate Program of Chemical Engineering Universitas Muhammadiyah Palembang Indonesia Program Study of Chemical Engineering Faculty of Engineering Universitas Muhammadiyah Palembang Indonesia

Biomass gasification converts into syngas through the gasification process is promising for renewable energy utilization. Although gasification is a sustainable and environmentally-friendly technology for value-added utilization of biomass, yield percentage is the major problem during biomass gasification. An optimized gasifier and highly active catalyst were proved to be effective for biomass production. Furthermore, the decomposition pathway was also important to advance the gasification reactors and catalyst design. This paper summarized the fundamentals, such as gasifier types, zeolite catalysts, and reaction and deactivation mechanisms. This review also sheds light on other excellent catalysts, effective gasifier, and catalyst reaction mechanisms are also discussed in detail. At last, the paper ends with a conclusion and a prospective discussion of the lab-scale research. At the contact time of 240 minutes, with a column height of 30 cm, at a temperature of 450 oC, the concentration of syngas promise well.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The influence of aging time variations on the fatigue life of aluminum alloy 2024-T351

引用

AIP Conference Proceedings 2024年第1期3053卷

作者： I. Made Astika I. Ketut Suarsana Dewa Ngakan Ketut Putra Negara Study Program of Mechanical Engineering Faculty of Engineering Udayana University Badung Bali 80361 Indonesia

Aluminum and its alloys are used to make a number of automotive components. It is due to aluminum’s light weight, anti-corrosiveness, formability, and affordable price. However, numerous procedures have been carried out to boost its strength due to mechanical characteristics, one of which is artificial aging. The effects of aging on the fatigue life of aluminum 2024-T351 will be examined in this study. The technique of treating the solution involved heating it to 500 oC for an hour and then immediately cooling it to room temperature. By reheating the aluminum alloy to 180 oC and maintaining heat there for a variety of 2, 4, and 6 hours, the fake aging process was continued. The goal was to obtain various precipitation types in anticipation of an increase in the material’s fatigue life. Then, a reversed bending test was carried out with loads of 1.0, 0.9, 0.7, 0.5, and 0.4 σu. The results of the study indicated that aging time had an influence on the fatigue life of aluminum alloy 2024-T351. Fatigue life lengthens with increasing aging time. The increase in fatigue life ranges from 13.3–63.3% compared to aluminum without heat treatment.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Comparative Analysis of the Influence of Different Preparation Methods on the Properties of TEMPO-Oxidized Bacterial Cellulose Powder Films

引用

Journal of Natural Fibers 2024年第1期21卷

作者： Rahmadiawan, Dieter Shi, Shih-Chen Abral, Hairul Ilham, Mohammad Khalid Sugiarti, Eni Muslimin, Ahmad Novi Ilyas, R.A. Lapisa, Remon Putra, Nandy Setiadi Djaya Tainan Taiwan Department of Mechanical Engineering Universitas Negeri Padang Sumatera Barat Padang Indonesia Laboratory of Nanoscience and Technology Department of Mechanical Engineering Andalas University Sumatera Barat Padang Indonesia Research Collaboration Center for Nanocellulose BRIN-Andalas University Padang Indonesia Serpong Banten Indonesia Weaponry Technology Study Program Defense Technology Faculty Indonesia Defense University Bogor Indonesia School of Chemical and Energy Engineering Faculty of Engineering Universiti Teknologi Malaysia Johor Bahru Malaysia Heat Transfer Laboratory Department of Mechanical Engineering Universitas Indonesia Depok Indonesia

The preparation method of cellulose films plays a vital role in their properties. This work aims to characterize 2, 2, 6, 6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized bacterial cellulose powder (TOBCP) films prepared with three different methods (casting, boiling-casting, and boiling-vacuum). It is found that film by casting (CT film) shows the best electrical properties. A light-emitting diode (LED) in a direct current circuit connected to the CT film glows the most brightly. However, this film had lower tensile strength and thermal stability than films from boiling and boiling-vacuum techniques. The boiling-vacuum film presents the most compact fiber structure and the highest tensile and thermal properties. This film also shows the lowest electrical properties and the dimmest LED light. These results demonstrate the TOBCP properties from different methods that can be used to prepare film with desirable properties. © 2024 The Author(s). Published with license by Taylor & Francis Group, LLC.

关键词： Light emitting diodes

来源：评论

学校读者我要写书评

暂无评论

Seven Management and Planning Tools in Megaproject Management: A Literature Review

引用

IOP Conference Series: Materials Science and engineering 2019年第1期598卷

作者： R W Damayanti Subagyo A R Wijaya B Hartono Industrial Engineering Study Program Department of Mechanical and Industrial Engineering Gadjah Mada University Yogyakarta Indonesia Industrial Engineering Study Program Sebelas Maret University Surakarta Indonesia

The management of megaproject is an emerging-topics to be studied by researchers. As an established management theory, quality management has a potential role to support studies and implementation of megaprojects. This study aims to explore the potential of Seven Management and Planning Tools (SMPT) in supporting megaproject management. A literature review method was utilized to analyse pertinent literatures that used the SMPT in megaproject studies. Based on 28 published articles, it is concluded that SMPT have been widely applied by scholars to analyse megaproject's study in various aspects. In addition, based on the project guideline PMBOK and the international standard project management ISO 21500:2012, the SMPT have opportunity to support the megaproject practice in each stage. This preliminary study gives the potential chance for further studies related to the use of SMPT in megaproject's real case as well as the opportunity to develop megaproject management tools specifically. These issues become a research opportunity in the field of quality management and megaproject management in the future.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Performance study of Regional Water Supply Company of Ternate City, North Maluku

引用

Journal of Physics: Conference Series 2021年第1期1899卷

作者： Nani Nagu Edward R Ahadian Lita A. Latif H Fabanyo Civil Engineering Study Program Faculty of Engineering Universitas Khairun Mechanical Engineering Faculty of Engineering Universitas Khairun

Regional Water Supply Company (RWSC) of Ternate City is a company managed by the local government which in its operation needs to prioritize the fulfillment of clean water for communities. Therefore the services of RWSC should based on the standards of quality service provided by the National Agency for the Improvement of Drinking Water Supply System. On the other side, the demand for clean water supply and services is increasing every year. This is caused by an increase in population and the development of cities or service areas relating to the improvement of the socio-economic. The purpose of this study is to evaluate the performance of water supply service providers in Ternate City. Data analysis based on the guidelines from the National Agency for the Improvement of Drinking Water Supply System involves several indicators such as the financial aspects, service aspects, operational aspects, and aspects of human resources. The result shows that the score of the financial reaches 0.92, the service aspect 0.88, the operational aspect 0.88, and the human resource aspect 0.52. These results show that the performance of Regional Water Supply Company (RWSC) of Ternate City achieves score 3.2 and it indicates that the performance of Regional Water Supply Company (RWSC) of Ternate City in the healthy category.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The effect of groove welding on mechanical properties and microstructure of wear resistance steel plate by Submerged Arc Welding

引用

IOP Conference Series: Materials Science and engineering 2019年第1期694卷

作者： Zuldesmi Mansjur Hendro M Sumual I P Tamba Mechanical Engineering Study Program Engineering Faculty Manado State University Mechanical Engineering Education Department Engineering Faculty Manado State University

Aim of this research is to analyze the mechanical properties and microstructure of wear resistance steel plates joined by Submerged Arc Welding at different grooves welding. The welding current of 300 Ampere, voltage of 28 Volt and travel speed of 38 cm/min was applied. The microscopical examination methods were used for weld zones. Impact toughness and rockwell hardness test were obtained from the weld metal, heat affected zone and the base metal samples. The fracture surfaces were examined by using optical microscope. As results, there was no difference of hardness and microstructure among three grooves welding. The significant differences were detected at the weld zones. Base metal had the highest hardness value. Ferrite and pearlite phases were obtained at three weld zones, but the heat affected zone had coarser grain structure than the base metal. Weld metal volume and electrode length significantly affected the impact toughness of joint, where the larger of the weld metal volume and length of electrode fill in the groove welding, the higher of impact toughness. The lowest impact energy and toughness value were attained at V groove and the highest was at I groove. The fracture surfaces at all groove welds showed ductile fracture dominantly.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The risk analysis of rice husk of co-firing fuel for boilers in sugar mills

引用

Journal of Physics: Conference Series 2020年第1期1446卷

作者： Yunaidi F Surahmanto S Harnowo Mechanical Engineering Study Program Politeknik LPP Yogyakarta Indonesia Department of Mechanical Engineering Education Universitas Negeri Yogyakarta Indonesia

Biomass is a very important energy source in the sugar mill industry as the main fuel in the power plant boilers. The efficiency of boilers for most sugar mills in Indonesia is quite low and the availability of bagasse is lacking so that in its operations, co-firing has to be applied with an alternative biomass fuels such as rice husk, cane trash, wood and saw dust. Based on the analysis, rice husk has a lower calorific (3248 cal/gr) value than that of bagasse (4076 cal/gr), but it has a higher ash content (20.67%) than that of bagasse (3.66%), so adjustments in boiler operation is required when using rice husk as co-firing. The higher ash content in biomass can affect the performance of the furnace and superheater in the boiler and increase the potential for deposit formation. The composition of rice husk ash was dominated by silica (SiO2) which reached 95.52%. It is higher than the silica content of bagasse which reached 74.99%. The high silica content in rice husks has the potential to conduce melting ash in boiler grate. The alkali content of rice husk which was around 3.64% is less than that found in bagasse which reached 17.33%. Even though, the ash composition analysis shows quite small potential for slagging, fouling, melting, sintering, and agglomeration, but the large amount of ash content in rice husks can increase the potential for the occurrence of the risks.

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：