American Research Journal of Physics

M. Y. Salem  

Abstract: Zinc-Aluminum samples were manufacturing noteworthy, also substantial. Zinc-Aluminum samples possess wonderful, powered advantages, altitude intensity, straightforward final touches, strength for ligation completely through the structure, and, adequate; transient creep Characteristics for Zinc-40Aluminium and Zinc-90Aluminium alloy is investigated during several running temperatures (T) eight degree extended between 523 until 593 K in 10 0C steps and under three varied constant utilized stresses (σ) equal 14.05, 17.12, and 20.23 MPa. The magnitude of β and n in the present study is distinctly linked on the creep test circumstances (T) and stress (σ) as εtr = βTn. The coefficients n is raised by rising T regardless of the utilized stress (σ); while β is reduced by growing (T) and /or stress (σ).The Zinc supplement from 10% until 40% refines the precise structure, enhancing the mechanical advantages, and decrease in creep reluctance is recognized i.e.; elevate the ductility; therefore, the second alloy Zinc-90Aluminium is more strengthening than first alloy Zinc-40Aluminium.

Mang’ are P. A.1,2*, Ndiritu F. G.1, Rotich S. K.3, Maka Tiani J. K.,4 Rapino B.W.2

Abstract: A caustics startle has been exploited in the control of malaria by targeting the female Anopheles gambiae. Studies with an inbuilt ultrasonic device (AC-UD) yielded 17.3% and 60.7% in the knockdown tests with fan-off and fan-on respectively. The repellency by the 10-34 kHz sound of Odorant tourmate based on observable behavioral responses and the unconfirmed repellency due to the sound from Anti-Pic® (EMR) on the female A. gambiae was 34.12% and 30.3% respectively. Recent studies with the electronic piezo buzzer mosquito repellent emitting 40-55 kHz sound treatment on mosquitoes yielded a protection index of 68.99%. Chemical malaria interventions were impeded by pathogen and vector resistance. This research thus determined and analyzed the optimal protection index in malaria vector hosts based on landing rates and bites elicited by the 10-34 kHz filtered recorded sounds of the male Anopheles gambiae, mixed male and female Delphinapterus leucas, and further investigated the sound of the male O. tourmate. Landing rates and behavioral responses of the female A. gambiae which were bred and reared under controlled laboratory conditions in Kenya Medical Research Institute evoked by the filtered into 10-34 kHz sound of the male mosquito, A. gambiae, male O. tourmate, and mixed male and female D. leucas were determined and analyzed statistically. The sounds of the A. gambiae, O. tourmate, and D. leucas yielded 2.10, 2.20, and 3.00 landings (bites)/minute; and 42.73%, 40.24%, and 10.64% protection index respectively. The optimal acoustic entropy, power deviation, and average acoustic power of the sound of the male A. gambiae were 4.58 bits, 35.80 dB, and 51.60 dB respectively with wide bandwidth. The protection index evoked by the sound of the male A. gambiae did not differ significantly from the reported repellency of the sound of O. tourmate and Anti-Pic® EMR, though differed significantly from the sound emitted by the and AC-UD.

Dr. Mahmoud Youssef Salem 

Abstract This paper develops methods to explore the influence of Cu increments on disfigurement temperature T and the applied stress σ on transient creep characteristics. The materials used in the present study are Tin-9Zinc1.5Silver and Tin-9 Zinc-1.5 Silver-0.7Copper alloys. Creep tests are performed under five different stresses ranging from 15.22 to 23.35 MPa and 4 unlike experimentation temperatures from 333 to 393 K near the transformation temperatures. The coefficients β and n for transient creep is evidently depended on the creep test conditions, T and stress σ. The coefficients β is reduced by growing T and/or load while n is raised by rising T regardless of the applied stress σ. The two samples presented extra contained phases of the intermetallic compound IMCs, Ag3Sn Agang, during solidification. An important refinement in the creep resistance is recognized by supplement 0.7Cu to the ternary Tin-9 Zinc-1.5 Silver solder Alloy. I . e. Tin-9 Zinc-1.5 Silver-0.7 Copper alloy is more strengthening than Tin-first alloy.