Open Access Original Research Article

Development of a Motorized Sheet Metal Rolling Machine

Olunlade Bankole Adeoye, Ogundola Jide, O. Odiba, Obaje Onuche

Advances in Research, Page 1-9
DOI: 10.9734/AIR/2018/32027

This paper presents the design result for the development of a motorized sheet metal rolling machine. The aim of the research is to design a rolling machine that can roll metal sheets of up to 3 mm thickness. Sheet metal rolling is a process of converting a sheet of metal into a complete hollow cylinder. The machine consists of three rollers; slip roll, pinch roll and a back roll. The rollers are made of mild steel shaft 1500 mm long and 90 mm in diameter. The whole system is mounted on a metal frame made from mild steel plate also. The sheet metal is fed continuously between the upper and lower roller. The upper roller is an adjustable roller which slides in an upward and downward direction normal to the roller. The bending stress using analytical method is 545.45 Nmm-2 with deflection of 909.46 mm. A load of 1753.25 N is required to bend a mild steel sheet metal of 3 mm.

 

Open Access Original Research Article

Efficacy of Plant Oils against Xanthomonas axonopodis pv. punicae

A. Chowdappa, S. Kousalya, A. Kamalakannan, C. Gopalakrishnan, K. Venkatesan

Advances in Research, Page 1-5
DOI: 10.9734/AIR/2018/45031

Pomegranate is an important tropical fruit crop, and the juice from the pomegranate is one of the most powerful antioxidants. Since 2002, pomegranate is severely affected by bacterial blight disease caused by Xanthomonas axonopodis pv. punicae. The occurrence of bacterial blight disease was noticed in all the pomegranate growing areas of Tamil Nadu. A bacterial pathogen was isolated from the infected plant parts and identified as Xanthomonas axonopodis pv. punicae through cultural and biochemical characterisation. With the aim of developing eco-friendly management of bacterial blight of pomegranate, different plant oils such as neem, mahua, thyme, clove, eucalyptus, lemongrass, pungam, peppermint, wintergreen, citronella were screened. Among these plant oils, thyme oil (10 per cent) recorded maximum inhibition (1.9 cm) of Xanthomonas axonopodis pv. punicae followed by lemon grass oil (1.85 cm). The Eucalyptus oil recorded an inhibition zone of 1.6 cm. No inhibition zone was observed in neem oil, pungam oil, mahua oil and winter green oil. Among these plant oils, thyme oil and lemon grass oil effectively retarded the growth of pomegranate bacterial blight under in vitro condition.

Open Access Original Research Article

Digit-Pair Stimuli as a Measure of Speech Reception Thresholds during Hearing Testing in the Paediatric Population within a Multilingual Context

Katijah Khoza-Shangase, Talia Singer

Advances in Research, Page 1-18
DOI: 10.9734/air/2018/v17i118552

Aims: This study aimed to investigate whether digit-pair stimuli offered a more precise measure for Speech Reception Threshold (SRT) testing in the paediatric population, in comparison to the phonetically balanced kindergarten (PBK) list during hearing testing in multilingual contexts.

Participants: A sample of 30 English first language speaking participants, aged between 5-7 years was included in the study. All participants were required to have normal hearing sensitivity and age-appropriate speech-language development.

Methods: Speech-language development was screened prior to the audiological assessment to ensure normal development. A basic audiological assessment was performed on the participants consisting of otoscopy, tympanometry, pure tone audiometry and SRT testing. Live-voice presentation was used for determination of the SRT scores; and these were than compared to the pure tone average (PTA) scores.

Results: Findings from the study have suggested that speech stimuli do show sensitivity to children’s development, and thus ensure a more reliable method of assessing the SRT-PTA relationship. A higher correlation was seen for the SRT-Digit Pairs list (r=0.43) as compared to the SRT-PBK list (r=0.41).

Implications: Findings of the current research provide valuable information regarding speech testing in children, with important implications for a multilingual society such as South Africa.

 

Open Access Original Research Article

A New Dynamical Theory of Decompression

Pierre Boudinet

Advances in Research, Page 1-20
DOI: 10.9734/AIR/2018/44062

We present a new way of taking in account the dynamics of the gas phase during decompression. This preliminary study, although being potentially capable of dealing with extreme dives, far from the no-stop limit, is not developed as a practical tool yet. It is based on the analysis of certain hypotheses underlying classical models using Maximal Values (M-Values). We derive a reduced set of ordinary differential equations, depending only on three empirical parameters. After having explained how the theory is built, we propose some values of the parameters that match the known surface M-Values well. Then we examine, for a single compartment, the theoretical predictions in the case of an abnormal situation (missing decompression stops) and in the case of dives with mixes containing helium (trimix and heliox). The results are more realistic than those of neo-Haldanian models. This new theory is capable of explaining why decompression accidents cannot occur immediately and why they can be delayed. The efficiency of oxygen breathing in such a situation is also well explained. More generally, the tolerance to inert gases depends on the breathed mix. In the present state, this theory, which is different from the Reduced Gradient Bubble Model (RGBM) and Variable Permeability Model (VPM), has an explanatory power that goes beyond the simple computation of decompression stops. Once developed as a full model, validated and definitively tuned, it could lead to a probabilistic approach of the safety, which is required by the extreme dives performed when exploring certain syphons.

Open Access Original Research Article

Could Co-Administration of Panax Ginseng and Vitamin E be More Effective in Reversing Nicotine- and Chronic Stress-induced Reproductive Toxicity in Male Albino Wistar Rats?

Bisong, Sunday Agba, Ukoh, Imoh Emmanuel, Odey, Paul, Ebong, Patrick Ekong

Advances in Research, Page 1-11
DOI: 10.9734/AIR/2018/45085

Exposure to the nicotine-based product through smoking or other means to douse the effects of societal stress is on the increase among young male adults of reproductive age. Reports have it that either of nicotine or stress alters male reproductive functions. This study assessed the protective role of vitamin E (Vit E) and Panax ginseng (PG) in alleviating the detrimental effect of nicotine + Chronic stress on reproductive functions in 30 male Wistar rats weighing 150-200 g. The rats were randomly divided into 5 groups of 6 rats each. Control (0.2 ml of castor oil/day as drug vehicle), nicotine (1.5 mg/kg/day)+ Chronic stress (generator noise 90-120 dB oropen environment 8 am to 4 pm daily), nicotine+ Chronic stress + Vit E (100 mg/kg/day), nicotine+ Chronic stress+ PG (500 mg/kg/day) and nicotine+ Chronic stress + Vit E + PG daily. Drugs were administered orally for 28 days, after 7 days of acclimatisation, while the stress groups were exposed to stressors from during the acclimatisation. Nicotine+ Chronic stress reduces sperm count, motility, rapid progressive forward movement and sperm viability compared to control, but increases percentage of sperm debris, non-motile sperm and slow progressive forward movement compared to control. Testosterone, luteinizing hormone and follicle stimulating hormone levels were reduced in nicotine+ Chronic stress compared to control. Testicular and epididymal tissues of nicotine+ Chronic stress rats were seriously impaired compared to control rats. PG and Vit E recovered the harmful changes in the assessed parameters and tissues compared to the untreated groups. PG and Vit E supplement appeared to attenuate the adverse effect induced by nicotine+ Chronic stress on male reproductive parameters.