Effect of shot peening at different almen intensities on fatigue behavior of AISI 304

AISI 304 stainless steel is a common material that is widely used in the extensive implant industry. The failure of this material, especially in bone implant applications, is affected by its fatigue load. The purpose of the present experiment is to improve fatigue crack growth resistance and surface hardness in AISI 304 by using a shot peening metal treatment with varying Almen intensities. In this experiment, specimens of AISI 304 underwent a shot peening treatment and then subjected to surface fatigue failure. The results of this experiment show that shot peening with an Almen intensity of 0,005 achieved a 192,3 % increase in fatigue life compared to a non-treatment material, with a fatigue life of 127 700 cycles (Paris constant C, n is 1x10-11 and 3,5, respectively). The surface hardness reached HV 429,63

Effect of pouring temperature on impact toughness on brass (Cu-Zn) through metal casting

The purpose of this study is to investigate the impact toughness of brass (CuZn) with five variations of pouring temperature during the production of cast-samples through a metal casting process. Five variations of the pouring temperature are 1060, 1110, 1160, 1210, and 1260 °C, respectively. Meanwhile, the mold is produced from medium carbon steel and does not preheat (room temperature). The results show the maximum impact toughness is 20,67 Joule at 1110 °C of pouring temperature, then the minimum impact toughness is 17,67 Joule at 1260 °C of pouring temperature. In general, it can be concluded that the impact toughness decreases with increasing pouring temperature

Influence of shot peening on surface properties and corrosion resistance of implant material AISI 316L

AISI 316L is one kind of implant materials due to its excellent mechanical properties and corrosion resistance. However, some of their mechanical and surface properties must be improved to a higher level of cobalt-based alloys and titanium properties. Shot peening is a surface treatment that improves properties on material surface. In this research, the effects of shot peening duration (0, 2, 4, 10, 20 and 30 min) on surface hardness, roughness, wettability, and corrosion in 0,9 % sodium chloride were investigated and discussed. According to the experimental results, it was found that shot peening increases both surface roughness and surface hardness compared to untreated sample. Furthermore, shot peening can reduce contact angle and corrosion rate after 2 minutes

Pemanfaatan Mangga Arum Manis dalam Pembuatan Dodol dengan Perbedaan Konsentrasi Tepung Ketan dan Rumput Laut

Utilization of cotton candy mango in directly encourage mango processing into derived products. One cotton candy mango derivative products is Dodol. Dodol is expected to be high in fiber. Fiber can be obtained from the addition of seaweed in the manufacture Dodol. The purpose of research is the use in the manufacture of cotton candy mango Dodol with different concentrations ofb glutinous rice and seaweed. The study was conducted using a completely randomized design (CRD) with 4 treatments and 4 replications. Each study uses comparative glutinous rice and seaweed that is different in each treatment including K1R1 (85:15), K2R2 (80:20), K3R3 (75:25) and K4R4 (70: 30). Parameters measured were moisture content, ash, crude fiber, and organoleptic. The best treatmentis K1R1with sticky riceflour ratio of 85% and15% moisture content of grass yield 10.14; ash content of 0.39; crude fiber of 8.30 overall acceptance

PENERAPAN PENDEKATAN SCIENTIFIC PADA MODEL PEMBELAJARAN KOOPERATIF TIPE THINK PAIR SHARE UNTUK MENINGKATKAN PEMAHAMAN SISWA DI KELAS VII SMPN 6 PALU

The aim of this research was to obtain the description of application scientific approach at cooperative learning of think pair share (TPS) to improve student understanding on line and angel in class VII Unggulan I SMP Negeri 6 Palu. The design of this research to Kemmis’ and Mc. Taggarts’design those are: (1) planning, (2) action, (3) observation and (4) reflection. This research was conducted in two cycles. The research result indicating that the application of scientific approach at cooperative learning of think pair share (TPS) can increase students understanding on line and angel through activities: (1) step think, students tried to copy and measured to find the angels which have same size, observed the picture of two parallel lines are intersected by another line, (2) step pair, students with they pair associating the relationship of the angels that are formed from two parallel lines are intersected by another line,(3) step share, studentstogether with they group communicated their discovery result in fron of the clas

Antecedents of zakat payers trust in an emerging zakat sector: The role of board capital and organisational behaviour.

The main objective behind establishment of effective govemance in organizations is to ensure mutual trust among the stakeholders. Incidentally, viliually all studies on organizational trust have not investigated the role of governance in trust building. In the research reported in this paper, the role of govemance in the model of zakat trust which was developed and validated based on responses from Nigerian zakat payers was shown. Such knowledge will help zakat managers to influence zakat payers' trust and patronage. In the study, we explore antecedents of trust; develop measurement scales used to explore the relationship between trust and the factors. Four factors, board capital, disclosure practices, nature of zakat institutions, and stakeholder management were identified through the use of structural equation modeling as being antecedents of trust. Since this is the first study ofzakat payers trust, it constitutes a significant contribution to knowledge and practice.The implications for zakat institutions in building trust of zakat payers are discussed. The zakat payer-trust model represents the main contribution of this study