Journal La Multiapp最新文献_第7页

Adequate Correlation between the Physical and Mechanical Properties of Glass Foam 玻璃泡沫的物理和机械性能之间的充分相关性

Journal La Multiapp Pub Date : 2021-09-27 DOI: 10.37899/journallamultiapp.v1i4.415

L. Paunescu, S. Axinte, M. Drăgoescu, F. Cosmulescu

{"title":"Adequate Correlation between the Physical and Mechanical Properties of Glass Foam","authors":"L. Paunescu, S. Axinte, M. Drăgoescu, F. Cosmulescu","doi":"10.37899/journallamultiapp.v1i4.415","DOIUrl":"https://doi.org/10.37899/journallamultiapp.v1i4.415","url":null,"abstract":"The paper presents experimental results obtained in the manufacturing process of a glass foam by adequate correlation between its physical and thermal properties (density, porosity, thermal conductivity) and mechanical (compressive strength) by a slight controlled overheating of the foamed material. Using a powder mixture of glass waste (87-91.5 %), coal fly ash (3-9 %) and silicon carbide (4-5.5 %) microwave heated at 935-975 ºC by this unconventional technique, constituting the originality of the work, was obtained a glass-ceramic foam with moderate compressive strength (1.8-2.6 MPa) and very low thermal conductivity (0.058-0.070 W/m·K). The material overheating generated a homogeneous porous structure characterized by closed cells with relatively large dimensions (without the tendency to join neighboring cells) making it difficult to transfer heat across the material. The foamed product is suitable for the manufacture of thermal insulation blocks for the inner or outer walls of the building without excessive mechanical stress, being an advantageous alternative by comparison with known types of polymeric or fiberglass thermal insulation materials.","PeriodicalId":272596,"journal":{"name":"Journal La Multiapp","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130035131","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: 2

IoT Based Image Processing Filters 基于物联网的图像处理滤波器

Journal La Multiapp Pub Date : 2021-09-27 DOI: 10.37899/journallamultiapp.v2i4.394

Noor Abbas, M. Shujaa, Entithaar Mhwes Zghair

引用次数: 1

Hydroelectric Power Plant Design with Hydraulic Pump System 水电厂液压泵系统设计

Journal La Multiapp Pub Date : 2021-08-12 DOI: 10.37899/journallamultiapp.v2i3.392

Dewn Innajie, Coolen Laure, Mecandily Gercia

引用次数: 0

The Effect of Variations in Drainage on Infiltration Rates in Pore Cylindrical Drainage 孔隙柱状排水中不同排水方式对入渗速率的影响

Journal La Multiapp Pub Date : 2021-08-12 DOI: 10.37899/journallamultiapp.v2i3.393

Nhi Thrinch, H. Thung

{"title":"The Effect of Variations in Drainage on Infiltration Rates in Pore Cylindrical Drainage","authors":"Nhi Thrinch, H. Thung","doi":"10.37899/journallamultiapp.v2i3.393","DOIUrl":"https://doi.org/10.37899/journallamultiapp.v2i3.393","url":null,"abstract":"Inundation and floods are caused by a combination of factors including lower rain catchment areas, decreasing infiltration rates, and an uneven distribution of rainfall throughout the year, which all combine to create flooding and inundation issues. The alternative option is to install an efficient drainage system that is ecologically friendly, since in addition to its role of accommodating and draining water, it also has the additional purpose of absorbing water into the subsurface soil layer. A pore hole is created at the bottom of the drainage channel in order for the water to be absorbed. There was a desire to investigate the impact of soil texture on the rate of infiltration, therefore this research was conducted. Three kinds of soil were utilized as infiltration medium, namely sandy loam, loam, and clayey loam, all of which were found in the surrounding area. In addition, there are three variants of hole spacing, namely 16 cm, 32 cm, and 48 cm, as well as three variations of flow rate, namely 400 cm3/s, 1500 cm3/s, and 2500 cm3/s, among others. As a consequence of laboratory studies, it has been shown that the impact of changes in flow rate on infiltration discharge is inversely proportional to the flow rate, i.e., the higher the flow rate, the smaller the infiltration discharge that occurs. The reason for this is because it is influenced by the flow velocity","PeriodicalId":272596,"journal":{"name":"Journal La Multiapp","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122985840","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

A comparative study of IP Versions 4, 5, and 6 IP版本4、5和6的比较研究

Journal La Multiapp Pub Date : 2021-08-11 DOI: 10.37899/journallamultiapp.v2i3.390

Naseef Husam Mohammad Alnile, Yasmin Makki Mohialden, M. S. Ahmed

引用次数: 0

Advanced Control And Development of Hydro and Diesel Generator Hybrid Power System Models for Renewable Energy Microgrids 可再生能源微电网水电柴油混合动力系统模型的先进控制与开发

Journal La Multiapp Pub Date : 2021-08-11 DOI: 10.37899/journallamultiapp.v2i3.383

Oshin Ola Austin

{"title":"Advanced Control And Development of Hydro and Diesel Generator Hybrid Power System Models for Renewable Energy Microgrids","authors":"Oshin Ola Austin","doi":"10.37899/journallamultiapp.v2i3.383","DOIUrl":"https://doi.org/10.37899/journallamultiapp.v2i3.383","url":null,"abstract":"The Nigerian power problem resulted to incessant and erratic supply of electricity and this has destroyed many industrial processes in the country. It has reduced productivity and has increased unemployment rate in the country to over 50million (this figure is over 70% of Nigerian youths). This has led many of the youths in the country to crime. It has led to the deaths of many innocent people in the country. As of 2016, the electricity energy consumption in the world from the world fact book revealed that the average power per capita (watts per person) in the United States is 1,377 Watts. In Canada, it is 1704 Watts per person and in South Africa; it is 445 Watts per person and in Australia, average power per capita (watts per person) is as high as 1,112 Watts. Whereas, the average electricity consumed in watts per person in Nigeria is just 14 Watts. Unfortunately, this has put the country in a rank of 189 out of 219 countries estimated. In this research work, a Hybrid Electric Power System (HEPS) which comprises Hydro Electric Power Plant (HEPP) and Diesel Generator (DG) was modelled and a control algorithm was established to improve the performance of the system. Hybrid power system mathematical and Simulink models were developed. The output power of the developed Simulink model was be optimized using optimum power point optimization techniques and control algorithms. Simulink models of the two components of the Hybrid Electric Power System were produced using MATLAB/Simulink software. The develop Simulink models was interconnected and final model was developed. The results obtained revealed that the problems associated with conventional methods of power generation was overcomed by the development of this renewable and non-renewable energy resources Hybrid Electric Power System (HEPS) models.","PeriodicalId":272596,"journal":{"name":"Journal La Multiapp","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132108338","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

Art Building Design Using Byblos Local Value Themes Approach 运用Byblos本地价值主题方法的艺术建筑设计

Journal La Multiapp Pub Date : 2020-12-31 DOI: 10.37899/JOURNALLAMULTIAPP.V1I6.293

Aung Ko Tneth

引用次数: 0

Interference Analysis of Medium Voltage Air Line 20 KV Feeder Using Failure Mode and Effects Analysis Method 用故障模式及影响分析法分析中压空气线路20kv馈线干扰

Journal La Multiapp Pub Date : 2020-12-31 DOI: 10.37899/JOURNALLAMULTIAPP.V1I6.301

Y. M. Tun, Aung Win

引用次数: 0

Manufacturing Ceramic Foams at Very High Temperature by the Unconventional Process of Direct Microwave Heating 利用微波直接加热的非常规工艺在高温下制造陶瓷泡沫

Journal La Multiapp Pub Date : 2020-12-18 DOI: 10.37899/journallamultiapp.v1i4.228

L. Paunescu, S. Axinte, M. Drăgoescu, F. Cosmulescu

{"title":"Manufacturing Ceramic Foams at Very High Temperature by the Unconventional Process of Direct Microwave Heating","authors":"L. Paunescu, S. Axinte, M. Drăgoescu, F. Cosmulescu","doi":"10.37899/journallamultiapp.v1i4.228","DOIUrl":"https://doi.org/10.37899/journallamultiapp.v1i4.228","url":null,"abstract":"\u0000 \u0000 \u0000 \u0000Abstract \u0000SiC ceramic foams were manufactured by direct microwave heating up to 1520 ºC. Silicon carbide (42-68 wt.%), quartz sand as a silica supplier (20-38 wt.%), coal fly ash (12-20 wt.%) and a constant water addition of 15 wt.% were used as starting materials. The ceramic foam samples had semi-open microstructures in which neighboring cells are partially connected to each other and partially closed. Due to the very dense cellular walls and the very low cells size (below 21 μm), the compressive strength had very high values (41.3-56.5MPa), the porosity was within an average value range (52.4-57.6%) and the thermal conductivity and the apparent density had relatively high values. In energy terms, the technique of direct microwave heating was very advantageous, the specific energy consumption being very low (1.04-1.21 kWh/kg) compared to the consumptions achieved by conventional methods. The application field of SiC ceramic foams obtained by the bonding method and using silica as a bonding agent includes hot gas or molten metal filters, porous burners, catalytic supports and others. From the four tested experimental variants, it could be concluded that the optimal sample was that achieved at 1520 ºC with 68% silicon carbide, 20% quartz sand, 12% coal fly ash and 15% water addition, having the porosity of 57.6%, thermal conductivity of 0.174 W/m·K, compressive strength of 56.5 MPa and the equivalent pore size between 9-21 μm. \u0000 \u0000 \u0000 \u0000","PeriodicalId":272596,"journal":{"name":"Journal La Multiapp","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127913145","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: 2

Manufacture of Cellular Glass Using Oak Leaves as a Foaming Vegetable Agent 以橡树叶为发泡剂制备多孔玻璃

Journal La Multiapp Pub Date : 2020-12-18 DOI: 10.37899/journallamultiapp.v1i4.210

L. Paunescu, S. Axinte, M. Drăgoescu, F. Cosmulescu

{"title":"Manufacture of Cellular Glass Using Oak Leaves as a Foaming Vegetable Agent","authors":"L. Paunescu, S. Axinte, M. Drăgoescu, F. Cosmulescu","doi":"10.37899/journallamultiapp.v1i4.210","DOIUrl":"https://doi.org/10.37899/journallamultiapp.v1i4.210","url":null,"abstract":"\u0000 \u0000 \u0000 \u0000Abstract \u0000The manufacture experimentation of a cellular glass exclusively from mineral waste and natural residues using the unconventional technique of microwave irradiation was the objective of the research whose results are presented in the paper. The originality of the paper results from the use of oak leaves as a vegetable foaming agent as well as the use of microwave energy in heating processes of the raw material powder mixture for manufacturing thermal insulating materials for the building construction. Worldwide, these processes use only conventional heating techniques. The experimental results led to the conclusion that both the use of waste and residues, as well as the unconventional heating technique allow to obtain porous materials with structural homogeneity having apparent densities and thermal conductivities that can decrease up to 0.34 g/cm3, and 0.071 W/m·K respectively. The compressive strength corresponding to the materials with the lowest values of density and thermal conductivity has an acceptable value (1.2 MPa) for the field of application. The specific energy consumption is around 1 kWh/kg, being approximately at the same level with the values of industrial consumptions achieved by conventional techniques. \u0000 \u0000 \u0000 \u0000","PeriodicalId":272596,"journal":{"name":"Journal La Multiapp","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131473863","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