Compaction behaviour of lateritic soil modified with cement and rice husk ash for road construction

This study is an investigation into the possibility of using rice husk ash blended with cement (CRHA) in the modification of the basic engineering properties of a marginal lateritic soil with the aim of qualifying the soil for use in the construction of roads. In the study, the properties of the natural soil sample such as bearing strength (measured in California Bearing Ratio: CBR), compaction behaviour as well as other consistency parameters were evaluated. The same properties were also evaluated for the soil samples modified with C-RHA. The findings of the study show that an increase in values of the C-RHA results a decrease in plasticity. An improvement in the CBR was observed with increasing value of the RHA at specified cement contents with peak values at 5% cement and 10% RHA. This indicates the potential of using 7.5-10% RHA admixed with 5% cement contents for laterite soil stabilization for use as a sub-grade soil for road construction.Keywords: Cement, Compaction behaviour, Lateritic soil, Rice husk ash, Soil stabilization, Road constructio

Analysis of metallurgical aspects and their role in processing and performance of superalloys: A review

Metallurgical processing factors like kinetic and thermodynamic parameters which are essential for modeling of γ′ phase precipitation have been studied. These parameters include γ′ solvus temperature, Gibbs free energy of dissociation of the γ matrix to form γ′, nucleation rate, effective diffusivity and interfacial energy. Nucleation methods and effect of cooling rate on the final phase structure have been analyzed. Co based  superalloys have been studied as a potential and promising material for aerospace applications. Effect of microporosity on the mechanical properties of Superalloys has also been analyzed.Keywords: Superalloys, Precipitation, Solidification, Gamma prime, Microsegregation, Microporosity

Desain Water Bus Sebagai Sarana Penunjang Pariwisata Di Pulau Biawak Kabupaten Indramayu, Jawa Barat

Sebagian besar masyarakat pesisir Kabupaten Lamongan adalah nelayan. Infrastruktur seperti Pelabuhan Perikanan Nusantara Brondong sangat mendukung kemajuan perikanan di Kabupaten Lamongan, namun kapal yang digunakan masyarakat Lamongan Untuk mencari ikan kurang efisien. Pemerintah akan memberikan bantuan berupa kapal penangkap ikan dengan desain baru, namun desain yang ditawarkan pemerintah ditolak karena kurang cocok dengan masyarakat Lamongan. Oleh karena itu didesainlah Kapal Penangkap Ikan Fiberglass Berbasis Kearifan Lokal Kabupaten Lamongan merupakan salah satu solusi untuk merealisasikan program tersebut. Dalam melakukan desain, yang pertama dilakukan pengumpulan data kapal tradisional untuk dilakukan analisis. Setelah mendapatkan data tahap kedua dilakukan analisis terhadap desain kapal tradisional. Ketiga dilakukan desain kapal penangkap ikan baru dengan parameter karakteristik kapal tradisional. Setelah didapatkan desain yang baru, kemudian diakhiri dengan pembuatan general arrangement, lines plan dan 3D model.  Dengan metode tersebut ukuran utama Kapal Penangkap Ikan Fiberglass Berbasis Kearifan Lokal Kabupaten Lamongan yang didapatkan adalah Lpp = 15.25 m, B = 6 m, T = 1.6 m, H = 4.302 m, CB = 0.513, dan Vs = 5-7 knot. Kelebihan kapal penangkap ikan fiberglass ini yaitu power yang dibutuhkan 169.38 kW, lebih kecil  63,92 kW atau 28% dibandingkan kapal tradisional dan muatan yang dapat diangkut 31,57 ton, lebih besar 4,07 ton atau bertambah 14% dari muatan sebelumnya

Social Discrimination in Jane Austen's Sense and Sensibility(1811):A Marxist Approach

The study is aimed to show the struggle of Elinor Dashwood and Marianne Dashwood to get prosperity. The object of the study of this research is to analyze the novel based on its structural elements and the struggle of Elinor Dashwood and Marianne Dashwood in order to get prosperity using a Marxist Approach. This research is qualitative research. Type of data of the study is text taken from two data sources: primary and secondary. The primary data source is taken from the novel Sense and Sensibility written by Jane Austen in 1811. While secondary data sources are other material taken from library books, criticism, essay, articles, journal and internet related to the study. Both data are collected through library reseach and analyzed by descriptive analysis. The outcome of the study shows the following conclusions. Firstly, based on the structural analysis, it shows that the character and characterization, setting, plot, style and theme of the novel are related into solid unity. Secondly, based on Marxist analysis the novel tells that in order to get prosperity the major charater Elinor Dashwood and Marianne Dashwood have to trough several conflict those are: cultural conflict and social conflict. Then, after overcoming those conflict Elinor Dashwood and Marianne Dashwood finnaly found what they are looking for and live happily

Studying the effect of variation in volume fractions of carbon fibres on mechanical and electrical properties of copper based composites

Metal Matrix Composites (MMC) belong to a class of weight efficient structural materials that are becoming popular in engineering applications especially in electronics, aerospace, aircraft, packaging and various other industries. This study focuses on the effect of varying carbon fiber wt. % on the mechanical properties of the Cu-C composite. The carbon fibers were coated with copper by electroless plating in order to increase the wettability of fibers with the copper matrix. Four compositions of copper based composite were developed by varying amount of carbon fibers. The yield strength decreases with increasing fiber size while the ultimate  tensile strength increases with increasing fiber size. Rockwell hardness test showed an increasing trend of hardness for increasing carbon fibers. The conductivity of Cu-C composite decreases by increasing carbon fibers content. Wear rate of Cu-C composite increases when carbon fiberscontent increases in the composite. SEM/EDX analysis revealed the size and distribution of fibers and indicated the fracture phenomenon.Keywords: Copper based Composites, Mechanical, Electrical and Wear Properties, Microstructur

Population fluctuations of brown plant hopper Nilaparvata lugens and white backed plant hoper Sogatella furcifera on rice

Population fluctuation of Brown Plant Hopper (BPH) and White Backed Plant Hopper (WBPH) were studied in Myanmar for two seasons (rainy and summer). Experiments was conducted on a 5 ha rainfed unsprayed field and done in 5 experimental units with an area of 100x100 m. BPH and WBPH were counted from 30 rice hills out of 2000 hills randomly. Relative humidity, temperature, rainfall were also recorded. Population fluctuation study revealed that BPH population was high at 64 and 74 days after transplanting (in Mid September 2007) associated with heavy rainfall, high temperature and high humidity. The BPH population was lowest (in mid week October 2007) suggesting that low rainfall and low humidity were at least partially responsible for the decrease population of BPH. The WBPH was being passed thorough the same weather regime as BPH. When the rainfall decreased or trend to stop the population began to build up reach its peak. This trend of population fluctuation is not directly related with rainfall, but rainfall could be in influencing the physiology of rice plant. This can be seen in the correlation and regression analysis. The fluctuation of plant hopper were correlated with temperature and showed higher correlation with rainfall patterns during the first cropping season. Second cropping season coincide with dry season, there was no rainfall and hopper population was observed to be correlated to temperature and relative humidity. Thus temperature, rainfall and relative humidity were observed to influence plant hopper population during the two different rice growing seasons

Thermal, electrochemical and mechanical properties of shape memory alloy developed by a conventional processing route

A Cu based shape memory alloy (Cu-Al-Ni) having a composition 83% Cu, 14% Al, 3% Ni, was developed and studied to determine the shape memory effect. Powder of Cu, Al and Ni was melted in a pit furnace at about 15500C, and casted alloy was heat treated at 8500C for a period of 50 minutes followed by water quenching. Microstructure characterization of alloy (Cu-Al-Ni) was carried out to determine the pre-quenched (cast structure) and quenched martensitic structure. The microstructure analysis of developed samples showed needle like structure of quenched martensite after heat treatment. It has a very good resemblance with structure of casted shape memory alloy obtained from the vacuum induction process. The Vickers hardness test was also performed. Quenched microstructure with improved hardness than pre-quenched structure was observed.Keywords: Shape Memory Alloy, Microstructure, Mechanical Propertie

Investigation of Potential Grounding Compound for Portable Applications

This paper applies to the electrical engineering world by making earthing system portable in providing low and acceptable resistance path. The system is develop in a small scale portable earthing system against the massiveness of Earth and becomes leverage if soil at the place is not suitable for plant grounding system. Hence, this paper presents findings on the research of new grounding medium material that will be housed in a small scale enclosure which behaves like native earth related earthing system by using kaolin and bauxite. The data obtained from lightning flashover testing, morphological and chemical composition of material analysis indicated that bauxite is more useful for portable grounding system application much better than kaolin in term of zero reference point function. The portable earthing system can be apply to air aviation systems , railway systems and military sectors particularly for electronic equipment zero referencing

Automatic Road Crack Segmentation Using Thresholding Methods

Maintenance of good condition of roads are very essential to the economy and everyday life of people in a every country. Road cracks are one of the important indicators that show degradations of road surfaces. Inspection of roads that have been done manually took a very long time and tedious. Hence, an automatic road crack segmentation using thresholding methods have been proposed in this study. In this study, ten road crack images have been pre-processed as an initial step. Then, normalization techniques, L1-Sqrt norm have been applied onto images to reduce the variation of intensities that skewed to the right. Then, thresholding methods, Otsu and Sauvola methods have been used to binarize the images.  From the experiment of ten road crack images that have been done, normalization technique, L1-Sqrt norm can help to increase performance of road crack segmentation for Otsu and Sauvola methods. The results also show that Sauvola method outperform Otsu method in detecting road cracks