检索结果-内蒙古大学图书馆

Exergy evaluation while drying fish waste in the forced convection rotary dryer

AIP Conference Proceedings 2024年第1期3145卷

作者： I. G. N. B. Catrawedarma Akhmad Afandi Anis Usfah Prastujati Endi Sailul Haq Department of Mechanical Engineering Politeknik Negeri Banyuwangi Banyuwangi Indonesia Livestock Product Processing Technology Study Program Politeknik Negeri Banyuwangi Banyuwangi Indonesia Department of Informatics Engineering Politeknik Negeri Banyuwangi Banyuwangi Indonesia

This study focuses on the exergy analysis of the fish waste drying system using a rotary dryer. The effect of the initial mass of fish waste on the exergy parameters was carried out. The exergy balance was applied in the drying chamber. The exergy parameters analyzed include exergy inflow, exergy outflow, exergy loss, and exergy efficiency. In terms of exergy sustainability, the sustainability index, environmental impact factor, waste energy ratio, and improvement potential were also analyzed. As a result, it was found that the exergy inflow for all initial masses was not significantly different. Meanwhile, if the fish waste’s initial mass is decreasing, the exergy outflow and exergy efficiency increase, and exergy loss decrease. The sustainability index decreases, and the environmental impact factor increases with increasing initial mass. Waste energy ratio and improvement potential increase with increasing initial mass.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Redesign and Remanufacturing the Shot Peening Machine: Model and Experiment

引用

Journal of Physics: Conference Series 2021年第1期1858卷

作者： Henny Pasandang Nari Mahadir Sirman Rusdi Nur M. Iqbal Mukhsen Mechanical Engineering Study Program Politeknik Ilmu Pelayaran Makassar Jalan Salodong Biringkanaya Makassar 90552 South Sulawesi Indonesia Mechanical Engineering Department Politeknik Negeri Ujung Pandang Jalan Perintis Kemerdekaan Km. 10 Makassar 90245 South Sulawesi Indonesia

Stainless steel is a material that is corrosion resistant and can be used as an implant material (type 316L). Cold treatment can only increase stainless steel's hardness, one of which is the shot peening process. This paper aims to remanufacture the shot peening machine for laboratory-scale testing purposes. The methodology used in designing the device, making all the necessary components, assembling it, and testing the shot peening machine with several specified parameters. The conclusion that can be obtained is the shot peening machine has been well designed and remanufactured and has appropriately functioned based on the performance that has been shown in the testing of stainless steel 316L.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The use of smartphone on learning activities: Systematic review

引用

IOP Conference Series: Materials Science and engineering 2020年第1期850卷

作者： R O Firmansyah R A Hamdani D Kuswardhana Study Program of Technological and Vocational Education Universitas Pendidikan Indonesia Bandung Indonesia Department of Mechanical Engineering Education Universitas Pendidikan Indonesia Bandung Indonesia Department of Electrical Engineering Education Universitas Pendidikan Indonesia Bandung Indonesia

This article aims to analyze the use of smartphone technology in education field, with a focus on exploring the effects of smartphone and its software application use in learning activities. This study was conducted using the method of systematic literature review through 3 stages, namely: searching related journals through an online database of several publishers, analyzing the search results journals and dividing them into 3 groups according to the research objectives, and describing the results of the analysis in the form of scientific and logical arguments. From the results of the study it can be concluded that smartphone is significantly useful in student-centered learning, can be used in various disciplines, and at all levels of education, and there are various smartphone applications that can be used for learning needs.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Absence of superconductivity in micrometer-sized ɛ-NbN single crystals

引用

Physical Review B 2022年第17期105卷 174512-174512页

作者： Fan-Yun Chiu Tsu-Lien Hung Cheng-Yen Liu Ya-Hsin Pai Wei-Liang Chien Peng-Jen Chen Ting-Kuo Lee Ming-Jye Wang Min-Nan Ou Chang C. Tsuei Maw-Kuen Wu Chia-Seng Chang Yang-Yuan Chen Department of Physics National Taiwan University Taipei 106319 Taiwan Republic of China Institute of Physics Academia Sinica Taipei 115201 Taiwan Republic of China Nano science and Technology program Taiwan International Graduate Program Taipei 115201 Taiwan Republic of China Department of Materials Science and Engineering National Taiwan University Taipei 106319 Taiwan Republic of China Department of Mechanical Engineering City University of Hong Kong Kowloon Hong Kong SAR China Hong Kong Institute for Advanced Study City University of Hong Kong Kowloon Hong Kong SAR China Department of Physics National Sun Yat-sen University Kaohsiung 804201 Taiwan Republic of China Institute of Astronomy and Astrophysics Academia Sinica Taipei 106319 Taiwan Republic of China Graduate Institute of Applied Physics National Chengchi University Taipei 116011 Taiwan Republic of China

It is important to study the properties of high quality single crystal in order to resolve the issue of an interesting material in which certain debatable fundamental properties exist. However, it is unfortunate that a sizable single crystal for experimental measurements is not always available. NbN is one of the examples; it has attracted scientific and engineering interest due to its diverse physical properties and a variety of structural phases. Until now superconductivity is only observed in cubic δ- and tetragonal γ-NbN but not in hexagonal ɛ-NbN. Recently, Zou et al. reported the observation of superconductivity with Tc∼11.6K in a hexagonal ɛ-NbN based on the measurement on a multiphase powder specimen. In order to resolve the issue, the work used the electron backscattering diffraction technique to characterize phases of micron-size NbN crystals from commercial powders and measure their transport properties. Our results unambiguously confirm that the hexagonal ɛ-NbN phase is not superconducting.

关键词： Electrical conductivity Specific heat Superconductors

来源：评论

学校读者我要写书评

暂无评论

The J-value as the measurement tool of the bonds investor's behavior

引用

AIP Conference Proceedings 2021年第1期2331卷

作者： Josep Ginting Lydia Anggraini 1Study Program of Accounting Faculty of Business President University Jl. Ki Hajar Dewantara Jababeka Education Park Cikarang Baru Bekasi 17550 Indonesia 2Study Program of Mechanical Engineering Faculty of Engineering President University Jl. Ki Hajar Dewantara Jababeka Education Park Cikarang Baru Bekasi 17550 Indonesia

For many years, mathematics has been used to solve the problem in economic and finance instead of natural science and engineering. This paper shows how accurate mathematics reads financial behavior. One of the financial areas using the mathematics approach is the bond valuation technique. Bond is one of the long term debt instruments. The finding in this research is that mathematics can be used to read the changes in the concept of a pricing model where the par value of bonds is always going to 100% at the maturity date. Theoretically, the bonds fair price is resulted by calculating the present value of future coupon interest of bonds, but not in practice, caused by the bonds investor behavior. The difference in price, resulted from both different approaches, in this paper is defined by a new mathematical concept to reflect the bonds' investor behavior. It is the aim of this research. To address the differences, we have evaluated the fair price of bonds calculation by creating new mathematics equations by combining the calculation of the present value of future coupon interest of bonds with the market concept models. The result is a new mathematical model called J-Value. To prove the eligibility of J-Value, a simulation was done. The mathematics model in this paper is found by combining the usage of a qualitative method and supported by a quantitative method.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Efficiency enhancement of die design for G2R-1A relay terminal using progressive tool

引用

Materials Today: Proceedings 2023年

作者： Lydia Anggraini Josep Ginting Trivia Nola Kazunori Takagi Mechanical Engineering Study Program President University Jababeka Education Park Cikarang Bekasi 17550 Indonesia Professional Engineer Study Program Atma Jaya Catholic University of Indonesia Jl. Jendral Sudirman No. 51 Jakarta 12930 Indonesia Accounting Study Program President University Jababeka Education Park Cikarang Bekasi 17550 Indonesia Omron Corporation Nishikusatsu Kusatsu City Shiga 525-0035 Japan

A progressive die is a set of tools performing series or several sheet-metal operations with a single tool. It has two or more workstations for the production of products. Every pressing stroke involves one operation, and the strip stock advances through the die strip. The main functional advantage of progressive die for the manufacturing industry is that it takes less time and gives a high volume of production. It can build precision tools with less time-consumption. The main task is to design a die for one of the parts of a relay product called G2R-1 Station Terminal A. The process of making this part is ineffective and uncomfortable under these conditions because it must go through three different stages of the process, which is a waste of time. This study discusses the design using the progressive die concept from Excess Hybrid or the CADD application as the initial sketch and Solid work as the visualization to achieve cost effectiveness and shorten the production process time. The result of total cost saving is 528,200,151 IDR per year.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Machine Learning Moment Tensor Potential for Modelling Dislocation and Fracture in L10-TiAl and D019-Ti3Al Alloys

arXiv

引用

arXiv 2023年

作者： Qi, Ji Aitken, Z.H. Pei, Qingxiang Tan, Anne Marie Z. Zuo, Yunxing Jhon, M.H. Quek, S.S. Wen, T. Wu, Zhaoxuan Ong, Shyue Ping Materials Science and Engineering Program University of California San Diego 9500 Gilman Dr Mail Code 0448 La Jolla CA92093-0448 United States 1 Fusionopolis Way Connexis #16-16 Singapore138632 Singapore Department of NanoEngineering University of California San Diego 9500 Gilman Dr Mail Code 0448 La Jolla CA92093-0448 United States Department of Mechanical Engineering The University of Hong Kong Hong Kong Department of Materials Science and Engineering City University of Hong Kong Hong Kong Hong Kong Institute for Advanced Study City University of Hong Kong Hong Kong

Dual-phase γ-TiAl and α2-Ti3Al alloys exhibit high strength and creep resistance at high temperatures. However, they suffer from low tensile ductility and fracture toughness at room temperature. Experimental studies show unusual plastic behaviour associated with ordinary and superdislocations, making it necessary to gain a detailed understanding on their core properties in individual phases and at the two-phase interfaces. Unfortunately, extended superdislocation cores are widely dissociated beyond the length scales practical for routine first-principles density-functional theory (DFT) calculations, while extant interatomic potentials are not quantitatively accurate to reveal mechanistic origins of the unusual core-related behaviour in either phases. Here, we develop a highly-accurate moment tensor potential (MTP) for the binary Ti-Al alloy system using a DFT dataset covering a broad range of intermetallic and solid solution structures. The optimized MTP is rigorously benchmarked against both previous and new DFT calculations, and unlike existing potentials, is shown to possess outstanding accuracy in nearly all tested mechanical properties, including lattice parameters, elastic constants, surface energies, and generalized stacking fault energies (GSFE) in both phases. The utility of the MTP is further demonstrated by producing dislocation core structures largely consistent with expectations from DFT-GSFE and experimental observations. The new MTP opens the path to realistic modelling and simulations of bulk lattice and defect properties relevant to the plastic deformation and fracture processes in γ-TiAl and α2-Ti3Al dual-phase alloys. © 2023, CC BY.

关键词： Aluminum alloys

来源：评论

学校读者我要写书评

暂无评论

Performance of solar panels as electricity source to burn rice powder in the biomass gasification process

引用

AIP Conference Proceedings 2023年第1期2828卷

作者： Suliono Dedi Suwandi Muhammad Luthfi Felix Dionisius Dori Yuvenda Mechanical Engineering Study Program Indramayu State Polytechnic. Legok Indramayu District West Java 4525 Indonesia Department of Automotive Engineering Faculty of engineering Universitas Negeri Padang. Campus UNP Air Tawar West Padang 25171 Indonesia

Currently, energy needs are one of the sources of human life that cannot be separated. Energy can be classified into two, energy sourced from fossils of living things and plants, with high rice production, making gasification tools an alternative to the use of rice husks into energy. Gasification is a thermochemical process of converting solid fuels into gas thus gasification using this resource is itself a renewable energy. This research is experimental. The air flow rate valve is set at speed = 2.2 m/s for the glowplug variation 3, 2.5m/s for the glowplug variation 4, 2.6m/s for the glowplug variation 5, 2.9 m/s for the glowplug variation 6 with Air Fuel Ratio (AFR)) 0.7%, 0.8%, 0.9%, 1%. With the glowplug variation, the highest temperature is up to 888°C with 1% AFR.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Sustainability Challenge of Micro Hydro Power Development in Indonesia

引用

IOP Conference Series: Earth and Environmental Science 2018年第1期147卷

作者： H Didik P N Bambang S Asep Y A Purwanto Study Program of Natural Resources and Environmental Management Bogor Agricultural University Indonesia Department of Mechanical and Biosystem Engineering Bogor Agricultural University Indonesia Department of Civil and Environmental Bogor Agricultural University Indonesia

Rural electrification using renewable energy is the best choice for many locations that far away from national grid. Many renewable energy project have been built for rural electrification such as micro hydro power plant (MHPP) and solar photovoltaic (SPV). Sustainability still the main challenge of off-grid renewable energy development for off-grid rural electrification in Indonesia. The objective of this paper is to review sustainability of micro hydro power development in Indonesia. The research method was done by field observation, interview with MHPP management, and reviewing some research about MHPP in Indonesia. Sustainability issues include various aspects that can be classified into 5 dimensions: technical, economic, socio-cultural, institutional, and environmental. In technical factors that lead to sustainability problem are: improper MHPP design and construction, improper operation and maintenance, availability of spare parts and expertise. In the economic dimension are generally related to: low electricity tariff and utilization of MHPP for productive use. In the social dimension are: the growth of consumer's load exceeding the capacity, reduced number of consumers, lack of external institutional support. In the institutional side, it is generally related to the ability of human resources in managing, operating and maintaining of MHPP. Environmental factors that lead the sustainability problems of MHPP are: scarcity of water discharge, conflict of water resources, land conversion over the watershed, and natural disasters.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Time-stepping approach for solving upper-bound problems: Application to two-dimensional Rayleigh-Bénard convection

引用

Physical Review E 2015年第4期92卷 043012-043012页

作者： Baole Wen Gregory P. Chini Rich R. Kerswell Charles R. Doering Program in Integrated Applied Mathematics University of New Hampshire Durham New Hampshire 03824 USA Center for Fluid Physics University of New Hampshire Durham New Hampshire 03824 USA The Institute for Computational Engineering and Sciences The University of Texas at Austin Austin Texas 78712 USA Department of Mechanical Engineering University of New Hampshire Durham New Hampshire 03824 USA School of Mathematics University of Bristol University Walk Bristol BS8 1TW United Kingdom Department of Physics University of Michigan Ann Arbor Michigan 48109-1040 USA Department of Mathematics University of Michigan Ann Arbor Michigan 48109-1043 USA Center for the Study of Complex Systems University of Michigan Ann Arbor Michigan 48109-1107 USA

An alternative computational procedure for numerically solving a class of variational problems arising from rigorous upper-bound analysis of forced-dissipative infinite-dimensional nonlinear dynamical systems, including the Navier-Stokes and Oberbeck-Boussinesq equations, is analyzed and applied to Rayleigh-Bénard convection. A proof that the only steady state to which this numerical algorithm can converge is the required global optimal of the relevant variational problem is given for three canonical flow configurations. In contrast with most other numerical schemes for computing the optimal bounds on transported quantities (e.g., heat or momentum) within the “background field” variational framework, which employ variants of Newton's method and hence require very accurate initial iterates, the new computational method is easy to implement and, crucially, does not require numerical continuation. The algorithm is used to determine the optimal background-method bound on the heat transport enhancement factor, i.e., the Nusselt number (Nu), as a function of the Rayleigh number (Ra), Prandtl number (Pr), and domain aspect ratio L in two-dimensional Rayleigh-Bénard convection between stress-free isothermal boundaries (Rayleigh's original 1916 model of convection). The result of the computation is significant because analyses, laboratory experiments, and numerical simulations have suggested a range of exponents α and β in the presumed Nu∼PrαRaβ scaling relation. The computations clearly show that for Ra≤1010 at fixed L=22,Nu≤0.106Pr0Ra5/12, which indicates that molecular transport cannot generally be neglected in the “ultimate” high-Ra regime.

关键词： RAYLEIGH-Benard convection RESEARCH BOUNDS (Mathematics) CONVECTIVE flow (Fluid dynamics) NATURAL heat convection NUSSELT number

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：