Assessment of surface treatment on fatigue life of cylinder block for linear engine using frequency response approach

Objectives: This study was focused on the finite element techniques to investigate the effect of surface treatment on the fatigue life of the vibrating cylinder block for new two-stroke free piston engine using random loading conditions. Motivation: An understanding of the effects related to the random loading is necessary to improve the ability of designers to accurately predict the fatigue behavior of the components in service. An internal combustion engine cylinder block is a high volume production component subjected to random loading. Problem statement: Proper optimization of this component that is critical to the engine fuel efficiency and more robustly pursued by the automotive industry in recent years. A detailed understanding of the applied loads and resulting stresses under in-service conditions is demanded. Approach: The finite element modeling and analysis were performed utilizing the computer aided design and finite element analysis codes respectively. In addition, the fatigue life prediction was carried out using finite element based fatigue analysis code. Aluminum alloys were considered as typical materials in this study. Results: The frequency response approach was applied to predict the fatigue life of cylinder block using different load histories. Based on the finite element results, it was observed that the fatigue life was significantly influenced for the nitriding treatment. The obtained results were indicated that the nitrided treatment produces longest life for all loading conditions. Conclusion: The nitriding process is one of the promising surface treatments to increase the fatigue life for aluminum alloys linear engine cylinder block

High Pressure Processing of Honey: Preliminary Study of Total Microorganism Inactivation and Identification of Bacteria

Due to the demand for better quality and safety food as it provides health benefits, the study of innovative high pressure processing (HPP) is currently one of the most interesting researches in food processing and preservation. As an alternative to classical thermal processing, HPP has potential to produce high quality foods that are microbiologically safe with ‘fresh-like’ characteristics and improved functionalities. In present work, the use of HPP will be investigated for its ability to inactivate bacteria spores, the heat resistance microbes. Preliminary results show that it is possible to use HPP to inactivate microorganisms present in high sugar content foods, particularly in Manuka honey. Further investigation will be carried out to find an optimal combination of treatment pressure, temperature and time. This project will generate a new approach in honey processing which can guarantee the safety of honey without a compromise on its quality and natural freshness

Effects of duckweed (Lemna minor) as dietary fishmeal substitute for silver barb (Barbodes gonionotus Bleeker)

A 60-day long growth trial was conducted to evaluate the suitability of duckweed Lemna minor as dietary fish meal substitute for silver barb (Borbodes gonionotus Bleeker). Five iso-nitrogenous diets were formulated to contain 35% protein and each treatment had three replicates with 15 fish in each aquarium with a mean initial weight of 1.5 ± 0.2 g. Duckweed was used in the experiment to replace 10, 20, 30 and 35% of the dietary fish meal in diet 2, 3, 4 and 5 respectively. Fish meal was used as the sole source of protein in control diet (Diet 1). Fish were fed three times daily at satiation level. In terms of growth, food conversion and protein utilization, the control diet and diet containing 17.07% duckweed showed the best (P<0.05) performance followed by diets containing 34.14%, 51.21% and 59.24% duckweed. Fish fed diets containing higher levels of duckweed had higher carcass moisture and lower lipid content compared to the control diet. Histopathological examination revealed abnormalities in the liver of fish fed diets containing higher inclusion of duckweed. It was noted that 10% of the dietary fish meal protein could be replaced by duckweed (L. minor) in the diet of silver barb (B. gonionotus)

Growth performance and morphological variations of local and Thai climbing perch (Anabas testudineus, Bloch)

Climbing perch locally known as koi (Anabas testudineus) is a popular food fish in our country. Thai climbing perch was introduced in Bangladesh from Thailand. To explore the variation in growth performance and orphological features of local and Thai climbing perch a study was undertaken. The highest gain in length, weight and SGR were found in Thai koi 12.23±0.38 cm, 55.83±0.53 g and 7.92±0.11 %/day respectively. Fourteen morphometric characters were studied where eleven (TL, SL, HL, HBD, LBD, DFL, PECFL, PELFL, AFL, UJL and LJL) showed significant difference (p<0.01) in Thai koi from the local ones. Of the meristic characters no. of dorsal fin rays (hard), anal fin rays (hard), caudal fin rays and scale along lateral line (upper and lower) as recorded from the Thai koi were significantly higher (p<0.01) than that of the local koi. The no. of dorsal fin rays (soft) in Thai koi were also significantly higher (p<0.05) from that of local koi. The number of vertebra were also variable in local and Thai climbing perch (25 in case of local koi and 26 in case of Thai koi). Hence, the results obtained form the present study satisfy the characteristics of A. testudineus which reveals that both the local and Thai koi belongs to the same species. Growth performance of Thai koi was better compared to local koi reared in same conditions

Pengaruh Komunikasi Antara Guru Dan Siswa Dalam Kegiatan Belajar Mengajar Dan Aktifitas Belajar Siswa Terhadap Prestasi Belajar Ekonomi Kelas XI IPS SMA Negeri 1 Kartasura Tahun Ajaran 2012/2013

Tujuan penelitian ini adalah untuk mengetahui: 1) Adanya pengaruh komunikasi antara guru dan siswa terhadap prestasi belajar, 2) Adanya pengaruh aktivitas belajar siswa terhadap prestasi belajar, 3) Adanya pengaruh komunikasi antara guru dan siswa dan aktivitas belajar siswa terhadap prestasi belajar. Metode penelitian yang digunakan dalam penelitian ini adalah metode kuantitatif asosiatif. Populasi dalam penelitian ini adalah seluruh siswa IPS SMA Negeri 1 Kartasura tahun ajaran 2012/2013 yang berjumlah 190 siswa dengan sampel sebanyak 125 siswa, diambil dengan teknik proposionate stratified random sampling. Teknik pengumpulan data menggunakan metode dokumentasi dan metode angket yang telah diuji cobakan dengan uji validitas dan uji reliabilitas. Teknik analisis data yang digunakan adalah regresi linier berganda, uji t, uji F, sumbangan efektif dan sumbangan relatif. Berdasarkan hasil analisis data diperoleh persamaan regresi linier ganda sebagai berikut: Y = 39,855 + 0,540 X1 + 0,180 X2, artinya prestasi belajar dipengaruhi oleh komunikasi antara guru dan siswa dan aktivitas belajar siswa. Berdasarkan analisis dan pembahasan dapat disimpulkan bahwa: (1) komunikasi antara guru dan siswa berpengaruh positif terhadap prestasi belajar. Hal ini terbukti dari hasil uji t yang memperoleh thitung untuk variabel komunikasi antara guru dan siswa sebesar 4,116 sehingga thitung > ttabel atau 4,116 > 1,980 (α = 0,05). (2) aktivitas belajar siswa berpengaruh positif terhadap prestasi belajar. Hal ini terbukti dari hasil uji t yang memperoleh thitung untuk variabel aktivitas belajar sebesar 2,184 sehingga thitung > ttabel atau 2,184 > 1,980 (α = 0,05). (3) komunikasi antara guru dan siswa dan aktivitas belajar secara bersama-sama berpengaruh positif terhadap prestasi belajar. Terbukti dari hasil uji F yang memperoleh Fhitung sebesar 13,754 sehingga Fhitung > Ftabel atau 13,754 > 3,071 dengan taraf sig 5%. (4) hasil perhitungan untuk nilai R2 sebesar 0,184 berarti 18,4% prestasi belajar dipengaruhi oleh variabel komunikasi antara guru dan siswa dan aktivitas belajar siswa, sisanya sebesar 81,6% dipengaruhi oleh faktor lain yang tidak ikut diteliti dalam penelitian ini

Finite element based fatigue life prediction of cylinder head for two-stroke linear engine using stress-life approach

Abstract: This describes the finite element based fatigue life prediction of cylinder head for two-stroke linear engine subjected to variable amplitude loading applicable to electric power generation. A set of Al-alloys, cast iron and forged steel for cylinder head are considered in this study

Analisa Kualitas Pelayanan Untuk Mengetahui Persepsi Dan Harapan Pelanggan Dengan Metode Service Quality (Servqual) (Studi kasus: Ahass 2597 Priyangan Motor )

Ahass motor priyangan merupakan perusahaan yang bergerak dalam bidang servis sepeda motor. Masalah yang sering muncul di ahass motor adalah banyaknya pelanggan yang mengeluhkan terhadap pelayanan yang diberikan. Padahal pihak bengkel telah berusaha memberikan pelayanan yang sebaikbaiknya. Penelitian ini bertujuan untuk mengidentifikasi persepsi dan harapan pelanggan dan untuk mengetahui dimensi mana saja yang memiliki gap terbesar sehingga perlu diperhatikan pihak bengkel. Data yang digunakan dalam penelitian adalah data primer yang diperoleh dengan survey lapangan melalui pembagian kuesioner kepada pelanggan bengkel Ahass Priyangan. Populasi dalam penelitian ini adalah pelanggan Bengkel Ahass Priyangan. Sampel yang diambil adalah 15% dari populasi yaitu sebesar 75 responden. Penelitian sampel yang digunakan menggunakan sampel acak (random sampling). Analisis data dilakukan dengan uji validitas, uji reliabilitas dan perhitungan servqual. Hasil perhitungan menunjukkan bahwa rata-rata nilai persepsi pelanggan pada dimensi bukti langsung (tangible) (3,242 < 3,262) dan dimensi daya tanggap (responsiveness) (3,153 2,560), jaminan (Assurance) (3,249 > 3,244), empati (emphaty) (3,173 > 3,147) lebih besar dari rata-rata nilai harapan pelanggan. Artinya kualitas pelayanan dari pihak bengkel Ahass Motor yang meliputi dimensi keandalan (reliability), jaminan (Assurance), empati (emphaty) telah memenuhi kepuasan pelanggan karena memiliki nilai gap positif sedangkan pelayanan dari dimensi bukti langsung (tangible) dan dimensi daya tanggap (responsiveness) belum memenuhi harapan pelanggan karena memiliki gap negatif

PENGARUH KEPERCAYAAN DAN PERILAKU PELANGGAN TERHADAP IKLAN MEDIA SOSIAL

PENGARUH KEPERCAYAAN DAN PERILAKU PELANGGAN TERHADAP IKLAN MEDIA SOSIAL

Pengaruh Gaya Kepemimpinan Instruktif, Konsultatif, Partisipatif dan Delegatif terhadap Motivasi Kerja Pada Karyawan CV. Mulia Game Sindo Solo

The aim of this research is to analyze the influence of leadership style and motivation upon employee performance in the Office of the Secretary, West Sulawesi. The research population consists of all 322 employees of West Sulawesi's Secretary Office. The stratified random sampling technique was employed, along with Slovi's formula, thus the number of employees sampled was 76. The research employed path analysis for testing the hypothesis. The results showed as follows: 1) instruction leadership style directly affects employee performance and influences indirectly through motivation. 2) consultation leadership style directly affects employee performance and influences indirectly through motivation. 3) participation leadership style directly affects employee performance and influences indirectly through motivation and 4) Delegation leadership style directly affects employee performance and influences indirectly through motivation

Analysis of Entry Qualification for Student Performance: An Intelligence Approach

This paper presents the intelligent system to investigate the influence of entry qualification, gender and entry results towards the student performance in university level. Entry qualifications are very important for the educational institution or educational providers to ensure quality graduate been produced. Total of 66 students were randomly selected in the faculty of mechanical engineering, Universiti Malaysia Pahang. The students are coming from foundation program, higher certificate of Malaysian Education (STPM) and diploma certificate. STPM is form six examinations in secondary school level. Radial Basis Function Network (RBFN) method was used to develop and predict the student’s performance. RBFN is an important tool to study the different type of variables for student performance. The obtained results show that the entry results plays important role however the gender plays no significant. Good entry results student normally maintains their performance throughout the study and becomes an excellent graduate