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The Ultimate Strength of Ring Stiffened Cylindrical Shell and Its Influence Factors

Research Article of Journal of Theoretical and Applied Sciences The Ultimate Strength of Ring Stiffened Cylindrical Shell and Its Influence Factors XIONG Zhixin1, HUI Hanju1*, HUANG Zhiquan2 1College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China. 2College of Logistic Engineering, Shanghai Maritime University, Shanghai 201306, China. Calculating the modes of cylindrical shell, then embed them into ideal perfect cylindrical pressure-resistant shell as the initial geometric imperfections to form the modal. According to the characteristics of each mode, the first 30 modes can be classified into four types, and it is found that the mode of the first type is the worst defect form. By calculation, the cylinder shell has the minimum ultimate strength when the 23rd mode happened. The sensitivity analysis of cylindrical shells with initial geometric defects shows that the critical buckling load has approximate linear relationship with different thickness radius ratio and defect amplitude. Six cylindrical shells of different materials are selected for research, and it is found that although the modal orders of the worst geometric defects of various materials are not the same, they all belong to the first type of mode. The comparison showed that the 921 steel and 909 steel materials are economic. Keywords:  Ring-stiffened cylinder; Ultimate strength; Initial imperfection; Mode ...

Experimental Study on the Performance of on-site Mixed Emulsion Explosives and Rock Impedance Matching

Research article of American Journal of Scientific Research and Essays Experimental Study on the Performance of on-site Mixed Emulsion Explosives and Rock Impedance Matching Huang Shengsong1, Zhao Mingsheng1,2*, Zhang Yiping1, Zhao Kejie1 1Mining School, Guizhou University, Guiyang 550025, China. 2Guizhou Xinlian Blasting Engineering Limited Corp, Guiyang 550002, China The proportion of on-site mixed emulsion explosives in mining is getting higher and higher, in order to better use the explosive performance of mixed explosives to improve energy utilization. Based on the wave impedance theory, the wave impedance of mixed explosives is changed to make rocks The wave impedances are matched to achieve the purpose of improving the blasting effect and reducing the bulk rate. After field test, increasing the sensitizer content within a certain range is beneficial to the improvement of explosive performance. When the explosive sensitizer content is 1.15%, the best matching coefficient of mixed explosive and rock impedance is 2.51, the rock after blasting is large. The block rate is reduced and the rock crushing effect is better. After this matching test, it is shown that it is feasible to improve the blasting performance by adjusting the explosive performance of the explosive by the optimal wave impedance coefficient according to the hardness of the rock, which can provide reference for the peers. Keywords: Impedance matching coefficient; Explosive performance; Blasting effect ...

INCIDENCE AND SEVERITY OF ANTHRACNOSE (Colletotrichum lindemuthianum) ON SELECTED COMMON BEAN (Phaseolus vulgaris L.) GENOTYPES

Research Article of American Journal of Agricultural Research INCIDENCE AND SEVERITY OF ANTHRACNOSE (Colletotrichum lindemuthianum) ON SELECTED COMMON BEAN (Phaseolus vulgaris L.) GENOTYPES Gaudencia J. Kiptoo1*, Miriam G. Kinyua2, Oliver K. Kiplagat2, Lexa G. Matasyoh3 1Egerton University, Biological Science Department P.O. Box 536-20115, Njoro-Kenya. 2University of Eldoret, Biotechnology Department P.O. Box 1125-30100, Eldoret-Kenya. 3University of Eldoret, Biological Science Department P.O. Box 1125-30100, Eldoret-Kenya Common bean (Phaseolus vulgaris L.), is among the most important legume crop for protein source in peoples’ diet globally and including Kenya. Anthracnose (Colletotrichum lindemuthianum) is a common disease of legumes that causes yield loss of upto 90-100%. Potential  production of common beans in Kenya is expected to be above 2000 kg ha-1 but due to challenges of pests and diseases among them anthracnose, it remains below potential yields. The aim of the recent study was to investigate selected common bean genotypes for anthracnose resistance in Kenya. The study was done in three varied agro-ecological zones; Busia, Bungoma and University of Eldoret. Fifteen genotypes were evaluated on field experiment to ascertain anthracnose incidence and severity. Four bean genotypes were used as experimental controls; two resistant and two susceptible controls. Data was collected on incidences and severity and subjected to Analysis of variance in SAS version 9.1. Mean values were separated using Tukeys’ Studentized Range Test. The results revealed tolerant and resistant genotypes with lower incidences and severity than those of resistant controls while susceptible genotypes recorded higher incidences and severity than those of the susceptible controls. Tolerant genotypes were; Ciankui, Tasha, and KK8 while the resistant genotypes were; Miezi mbili, KK15 and Chelalang. Site variation was significant at (P≤0.05) with Busia 82%, Bungoma 76% and University of 53%. KK15, Tasha and Chelalang were tolerant in all sites, and this could be attributed to their genetic resistance. The ...

Retained Penile Ring: Case Reports

Case Report of International Journal of Case Reports Retained Penile Ring: Case Reports Odusanya Benjamin Olasunkanmi1, Omisanjo Olufunmilade Akinfolarin2, Salami Olayinka Abdurraheem3, Saliu Abdulwaid Niran4 1Consultant urologist, Department of Surgery, General Hospital, Marina, Lagos; 2Consultant urologist, Department of Surgery, College of Medicine, Lagos State University Teaching Hospital; 3Consultant Orthopaedic surgeon, Department of Orthopaedics, General Hospital, Marina, Lagos; 4Consultant urologist, Department of Surgery, General Hospital, Marina, Lagos. Background: Penile constriction rings have been used to prolong erection with vacuum devices in the treatment of erectile dysfunction. Some have also employed it for recreational purposes with the attendant risks of penile edema, strangulation and necrosis. We present two cases of entrapped phallus by penile rings. Case reports: 16 years old with pain and swelling of the phallus of 12 hours duration. This started after placement of a phallic ring to purportedly prolong erection which he was later unable to remove the ring despite several attempts and developed progressive swelling and pain in the phallus. He was also unable to pass urine. Examination revealed a circumcised phallus that was detumescent but grossly edematous, tender with shiny skin. Initial simple manoeuvres in the casualty proved abortive and ring had to be cut with an orthopaedic instrument. He was subsequently able to void without difficulty or any haematuria. 47 year old Asian male with a 12 hour history of penile pain and swelling following entrapment of a penile ring he had inserted for sexual gratification about 24 hours before presentation. There was a history of haematuria. The removal of the penile ring was achieved with a combination of cold compress squeeze, corporal aspiration and lubrication under general anaesthesia. Conclusion: Successful management of retained penile ring depends on early presentation by the patient to avoid adverse outcomes. It may require instruments not normally found in the urologist ...

The Effect of Real Effective Exchange Rate Volatility on Uganda’s Trade Balance (1993-2015)

Research Article of Journal of Modern Economy The Effect of Real Effective Exchange Rate Volatility on Uganda’s Trade Balance (1993-2015) Dennis Mahebe1 ,Francis Wasswa2 and Willy Kagarura3 1Economist, National Planning Authority (NPA), Kampala-Uganda; 2Senior Lecturer, School of Economics, Makerere University, Kampala-Uganda; 3Senior Lecturer, School of Economics, Makerere University, Kampala-Uganda. This paper investigated the effect of Real Effective Exchange Rate (REER) volatility on Uganda’s Trade Balance for the period 1993Q4 to 2015Q4 by employing the GARCH and ARDL methodology. The ARDL results revealed a negative relationship between the trade balance and the volatility of the real effective exchange rate in the short run. The Impulse Response Function results show evidence of the J-Curve on Uganda’s Trade Balance. Also, the results on the REER indicate that the Marshal-Lerner Condition holds for Uganda’s case. The study therefore recommends that developing a well-developed hedging facility like forward markets and institutions is critical in protecting exporters against exchange rate risk in the short run by reducing volatility of the real effective exchange rate with the aim of improving Uganda’s trade balance. Keywords: REER-Volatility, Trade Balance, GARCH, ARDL, J-Curve, Marshal-Lerner Condition ...

Thoracic mediastinal Chordoma an atypical location – Mimicking as Adenocarcinoma

Case Report of International Journal of Case Reports Thoracic mediastinal Chordoma an atypical location - Mimicking as Adenocarcinoma Sam Supreeth, Sang-Il Kim, Woong-Ki Jeon, Hyung-Youl Park, Ji Hoon Bahk, Chan Kwon Jung, Seok-Hwan Moon, Young-Hoon Kim 1Department of Orthopaedic surgery, Khoula Hospital, Muscat, Oman 2Department of Orthopaedic Surgery, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea 3Department of Orthopaedic Surgery, Eunpyeong St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea 4Department of Hospital Pathology, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea 5Department of Thoracic Surgery, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea Background: Chordoma, a rare tumor accounting for less than 4% of primary bone tumors of which incidence of thoracic chordoma is 2-5%. Describing an incidental diagnosis of chordoma in a posterior mediastinal mass. Case description: An asymptomatic 52year lady with an incidental posterior mediastinal mass was diagnosed Adenocarcinoma on endoscopic biopsy of the oesophagus. Nonresponsiveness to chemoradiotherapy warranted en-bloc resection with VATS- assisted thoracotomy which turned to be a Chordoma. Conclusion: We report this atypical presentation of chordoma mimicking as adenocarcinoma with literature review — a unique learning experience. Keywords: Thoracic mediastinal Chordoma, atypical location, Mimicking as Adenocarcinoma ...