418 research outputs found

    Corrosion of steel in the Arabian environment

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    Quantification of Head Acceleration Events in Rugby League: An Instrumented Mouthguard and Video Analysis Pilot Study

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    Instrumented mouthguards (iMG) were used to collect head acceleration events (HAE) in men’s professional rugby league matches. Peak linear acceleration (PLA), peak angular acceleration (PAA) and peak change in angular velocity (∆PAV) were collected using custom-fit iMG set with a 5 g single iMG-axis recording threshold. iMG were fitted to ten male Super League players for thirty-one player matches. Video analysis was conducted on HAE to identify the contact event; impacted player; tackle stage and head loading type. A total of 1622 video-verified HAE were recorded. Approximately three-quarters of HAE (75.7%) occurred below 10 g. Most (98.2%) HAE occurred during tackles (59.3% to tackler; 40.7% to ball carrier) and the initial collision stage of the tackle (43.9%). The initial collision stage resulted in significantly greater PAA and ∆PAV than secondary contact and play the ball tackle stages (p &lt; 0.001). Indirect HAE accounted for 29.8% of HAE and resulted in significantly greater ∆PAV (p &lt; 0.001) than direct HAE, but significantly lower PLA (p &lt; 0.001). Almost all HAE were sustained in the tackle, with the majority occurring during the initial collision stage, making it an area of focus for the development of player protection strategies for both ball carriers and tacklers. League-wide and community-level implementation of iMG could enable a greater understanding of head acceleration exposure between playing positions, cohorts, and levels of play.</p

    Improved bioavailability of timolol maleate via transdermal transfersomal gel: Statistical optimization, characterization, and pharmacokinetic assessment

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    AbstractTimolol maleate (TiM), a nonselective β-adrenergic blocker, is a potent highly effective agent for management of hypertension. The drug suffers from extensive first pass effect, resulting in a reduction of oral bioavailability (F%) to 50% and a short elimination half-life of 4h; parameters necessitating its frequent administration. The current study was therefore, designed to formulate and optimize the transfersomal TiM gel for transdermal delivery. TiM loaded transfersomal gel was optimized using two 23 full factorial designs; where the effects of egg phosphatidyl choline (PC): surfactant (SAA) molar ratio, solvent volumetric ratio, and the drug amount were evaluated. The formulation variables; including particle size, drug entrapment efficiency (%EE), and release rate were characterized. The optimized transfersomal gel was prepared with 4.65:1 PC:SAA molar ratio, 3:1 solvent volumetric ratio, and 13mg drug amount with particle size of 2.722μm, %EE of 39.96%, and a release rate of 134.49μg/cm2/h. The permeation rate of the optimized formulation through the rat skin was excellent (151.53μg/cm2/h) and showed four times increase in relative bioavailability with prolonged plasma profile up to 72h compared with oral aqueous solution. In conclusion, a potential transfersomal transdermal system was successfully developed and the factorial design was found to be a smart tool, when optimized

    Организация СТО для легковых автомобилей на участке трассы Р255 «Сибирь»

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    В разделе "Объект и методы исследования" приведена характеристика предприятия. В разделе "Расчеты и аналитика" в технологической части представлены необходимые расчеты для организации станции технического обслуживания. В третьем разделе ВКР представлены результаты проведенного исследования. В разделе "Финансовый менеджмент, ресурсоэффективность, ресурсосбережение" рассчитаны общеэксплуатационные затраты на проведение технического обслуживания и текущего ремонта на предприятии. Срок окупаемости капитальных вложений составит 1,2 года. В разделе "Социальная ответственность" выявлены опасные и вредные факторы, а так же предложены мероприятия по их ликвидации.In the "Object and Methods" shows a characteristic of the company. In the "Calculations and Analytics" in the technological part presents the necessary calculations for the organization of the service station. The third section presents the results of the WRC study. In the "Financial management, resource efficiency, resource conservation" calculated the costs of maintenance and repair work at the enterprise. The payback period of capital investment will be 1.2 years. In the "Social Responsibility" found dangerous and harmful factors, as well as proposed measures for their elimination

    Poultry and Beef Meat as Potential Seedbeds for Antimicrobial Resistant Enterotoxigenic Bacillus Species: A Materializing Epidemiological and Potential Severe Health Hazard

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    Although Bacillus cereus is of particular concern in food safety and public health, the role of other Bacillus species was overlooked. Therefore, we investigated the presence of eight enterotoxigenic genes, a hemolytic gene and phenotypic antibiotic resistance profiles of Bacillusspecies in retail meat samples. From 255 samples, 124 Bacillus isolates were recovered, 27 belonged to B. cereusand 97 were non-B. cereus species. Interestingly, the non-B. cereus isolates carried the virulence genes and exhibited phenotypic virulence characteristics as the B. cereus. However, correlation matrix analysis revealed the B. cereus group positively correlates with the presence of the genes hblA, hblC, and plc, and the detection of hemolysis (p \u3c 0.05), while the other Bacillus sp. groups are negatively correlated. Tests for antimicrobial resistance against ten antibiotics revealed extensive drug and multi-drug resistant isolates. Statistical analyses didn’t support a correlation of antibiotic resistance to tested virulence factors suggesting independence of these phenotypic markers and virulence genes. Of special interest was the isolation of Paenibacillus alvei and Geobacillus stearothermophilus from the imported meat samples being the first recorded. The isolation of non-B. cereus species carrying enterotoxigenic genes in meat within Egypt, suggests their impact on food safety and public health and should therefore not be minimised, posing an area that requires further research
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