Performance impact of honing dynamics on surface finish of precoated cylinder bores

The surface modification of engine cylinder bores with improved sliding properties is often produced by the honing process. This multi-stage process is performed using abrasive stones loaded against the bore with simultaneous rotation and oscillation. To guarantee this process robustness with acceptable dimensional accuracy and surface quality, the stone dynamic effects in continuous balanced contact with the workpiece have to studied deeply. This paper highlights these effects on honed surface textures. The stone dynamic behavior was studied at conventional regime ranged from 0,5g to 1,5g as often used in mass production. In this range, the dimensional accuracy is ensured by opposition to the surface appearance. However, higher accelerations up to 2,5g improve simultaneously the form quality (especially straightness) and reduces the cycle time. This work shows, at least, that the bore surface finish can be dynamically controlled while honing. This technology is enabled by a micro scale regeneration mechanism of abrasive stones

量子ウォークの尾付きモデルについて

othe

量子ウォークの尾付きモデルについて

Tohoku University博士（情報科学）thesi

Open channel flow analysis of drains at Universiti Malaysia Pahang campus Pekan using Infoworks CS

Flood can be defined as an overflow of water from water body normally occurred when the water body can no longer contain the precipitation in the area and the soil can no longer absorb the water. This resulted in overflow and one of the causes of flood. The study area is Universiti Malaysia Pahang (UMP) campus Pekan where it is located in an area where flood occurrences are recorded each year with the main reason is overflow from the Pekan River. The soil condition in the area also poses problem where it is swampy and this type of soil have low porosity and can lead to increase in surface runoff. The objectives of this study is to develop and validate 2-Dimensional hydrological modeling of UMP Pekan drainage system using Infoworks CS and to determine the capabilities of existing drain to sustained runoff at maximum level. Data are obtained from (Jabatan Pembangunan dan Pengurusan Harta) JPPH UMP such as invert level, platform level, and plan view of study area. The study area which is 60 hectares area in total was divided into three zones; Zone A, Zone B and Zone C. In order to analyze the effectiveness of the drains at UMP Pekan, two method of calculation is used which are Rational Method for calculating the surface runoff and Manning Equation for the calculation of drain flowrate. Infoworks CS will be used to simulate the event of 8 hour rainfall with data obtained from MASMA with 2 ART. Water level is obtained after simulation process is completed. Result shows Zone C experienced overflow while Zone A drainage system experienced high water level that almost cause overflow. Only Zone B shows properly design drainage system where water level is in the mid-section of the drain. This result is proven both in manual calculation and software simulation

Study on the impact of moisture content on subgrade strength

This study presents the relationship between subgrade strength and moisture content. Major function of subgrade is to provide support to pavement. Subgrade soil type, compacted density and moisture significantly affect pavement design. Surface and subsurface drainage of pavement and from adjoining land also affect subgrade strength significantly. Subgrade strength is mostly expressed in terms of California Bearing Ratio. The subgrade strength owing to its inconsistency or variable nature poses a challenge for the engineer to come up with a perfect design pavement. For example, the subgrade is always subjected to change in its moisture content due to precipitation, capillary action, and flood or subside of water table. Change in moisture content causes change in subgrade strength. It becomes quite essential for an engineer to understand the exact nature of dependence of subgrade strength on moisture content. In this study variation of subgrade strength with moisture content was studied considering, the variation of subgrade strength with days soaking and to analyse the relationship between subgrade strength, moisture and days soaking by used statistical software Mnitab16. Thus the different soil samples were tested for their proctor density, optimum moisture content, California Bearing Ratio after being soaked in water for 1 day, 2 days, 3 days and 4 days and Un-soaked for each sample. Study shows that a strong curvilinear correlation between subgrade strength and moisture content. On increasing number of days of soaking, subgrade strength decreases due to increases of moisture content. The rate of change in subgrade strength per percentage change in moisture content during un-soaked from the optimum moisture content was one to seven times larger than during soaking for four days from optimum moisture content with the average of about five times. So it will help design a good road pavement because subgrade is the foundation of road pavement

Correlation Between Defense Mechanisms and Readiness to Change Among Relapsing Addicts

The number of relapsing addicts is increasingly worrying from year to year. This study was conducted to examine at the relationship between defense mechanisms and the level of readiness to change in relapsing addicts. Although the drug addicts have been treated at the treatment center, however, repeated cases of drug addicts still occur. Six research questions were developed to see how far the variables consisting of defense mechanisms could correlate with readiness to change among addicts who were undergoing treatment. This study was carried out involving 125 addicts in two separate treatment centers in Melaka and Selangor. The selected sample were addicts who have undergone a relapse phase at least once in drug addiction. Statistical data analysis using Statistical Packages for Social Sciences 20 (SPSS-20) were used to analyze the data. Statistical descriptive is used to view the results of demographic data constructed. T-test and ANOVA are used to see the relationship between the variables. The regression analysis is used to predict the defense mechanisms with the stage of readiness to change among relapsing addicts. The results showed that the defense mechanism had a significant relationship to the stage of readiness to change among samples. The results of this study provide information on treatment services in the drug rehabilitation to improve the treatment method appropriately to the drug addicts in preventing relapse

Les banques participatives au Maroc et le financement de la petite et moyenne entreprise : cas de la région Casablanca – Settat

Ces dernières années, la banque participative a constitué un domaine de concurrence important pour les systèmes bancaires du monde entier. Il s'agit d'un nouveau mode de financement basé sur le partage des pertes et des profits. En 2015, la Banque centrale du Maroc a mis en œuvre une loi bancaire réglementant les opérations des banques participatives sur le marché financier marocain. Cette contribution minimale est due à la difficulté qu'ont ces entreprises à obtenir du financement. Dans ce contexte, les banques participatives établies au Maroc en 2017 proposent des produits conformes à la charia, basés sur le partage des profits et des pertes, qui peuvent apporter des solutions de financement aux PME. A travers les résultats de nos recherches quantitatives touchant 89 PME marocaines, On peut dire que les banques participatives, notamment le produit Moudaraba et le produit Moucharaka (finançant des projets d'investissement à moyen et long terme) et le produit Salam (répondant aux besoins en fonds de roulement à court terme), peuvent contribuer efficacement au financement des PME Marocaines. &nbsp

Evidence of anti-inflammatory and anti-ulcer properties of aerial parts of Centaurea tougourensis Boiss. and Reut.

Purpose: To determine the anti-inflammatory and anti-ulcer properties of the aerial parts of Centaurea tougourensis Boiss. & Reut. Methods: The effects of n-butanol (n-BuOH) extract of the aerial part of Centaurea tougourensis on carrageenan-induced paw edema and ethanol-induced gastric mucosal damage were determined at 2 doses (200 and 400 mg/kg, po) in a mouse model. For each test, the animals were randomly divided into negative and positive control groups, as well as extract-treated groups. The mice were observed for any sign of inflammation for a period of 24h. Results: Reduction of paw edema by C. tougourensis extract was highly significant (p < 0.001) at a dose of 400 mg/kg 24 h after carrageenan injection, with 55.26 % inhibition, followed very closely by 53.15 % inhibition at the dose of 200 mg/kg; indomethacin group showed an inhibition of 60 %. Histological examination supported the inhibition results. A significant reduction in inflammation by the extract at a dose of 400 mg/kg was also observed. No sign of ulcer was observed with C. tougourensis at the two doses (200 and 400 mg/kg). The total polyphenol content of the n-BuOH extract was 85.44 цg gallic acid equivalent/mg of extract. Tannins were the most abundant fraction (51.87 цg tannic acid equivalent/mg of extract), followed by flavonoids (25.55 цg quercetin equivalent/mg of extract). Conclusion: The results indicate that C. tougourensis may have potential beneficial effects in the treatment of diseases associated with inflammation and pain, besides its protective effect on the gastrointestinal tract

Ecology of Haemaphysalis wellingtoni in Red Junglefowl

The ecology of the parasitic stages of Haemaphysalis wellingtoni was studied in 30 Red Junglefowls in a farm in Jenderam Hulu, Sepang, Selangor, Malaysia. The free ranging Red Junglefowls are trapped using leg traps and individual bird was carefully examined for tick infestations. The ticks were collected from the neck, comb, and outer ear canal, counted and preserved in 70% ethanol. The identification of the tick species and their stages at each site was done through examination using a stereomicroscope and keys to tick identification. Tissue biopsies with ticks attached were also obtained to determine the pathology of tick-feeding sites. The comb tissues were processed with the standard histological technique and stained with hematoxylin and eosin to observe the cellular changes initiated by the ticks. Only one species of the tick was identified, which was Haemaphysalis wellingtoni. The mean of tick numbers in the outer ear canal was the highest (1.77± 0.193), followed by the dorsal aspect of the neck (1.32± 0.329) and the comb (0.72± 0.190). In this study, there are significant differences in stage of the ticks at different infestation sites suggesting that they have preferential site for different stages of their life-cycle. Generally, the mean count for tick stages (adult, nymph and larval) were almost similar on the dorsal part of neck and the outer ear canal. The mean numbers of nymph and larval stages in the neck and outer ear canal were similar, except for the adult stage which was 3.63 on neck and 3.33 in the outer ear canal. However, adult stage was absent on the comb while the mean of nymph stage was 0.16. The larval stage was lower in number in the comb (0.87) compared to the neck and outer ear canal (both 2.2). The cellular changes observed at tick feeding sites consisted of eosinophil and very high lymphocyte infiltrations which indicated chronic inflammation. The congestion, hyperkeratosis and detachment of the keratin layer were also observed at tick feeding sites