This study presents the crashworthiness performance of Al6061 tubes with stiffened quatrefoil sections under axial and oblique impact conditions. Influences different types stiffeners through depth in design a sectional crash absorber structure are investigated, numerically. Four stiffener patterns considered angles 0º, 10º, 20º, 30º measured from horizontal axis. Force-displacement characteris...

The work analyzes the influence of number passes in a shell and tubes condenser heat exchanger, with an inlet pressure R134a refrigerant equal to 1.2 MPa. fluid that circulates is water or water-based nanofluid fraction aluminum oxide nanoparticles (Al2O3), methodology used subdivides exchanger into three distinct regions: overheated region, saturated subcooled region. main parameters analyze t...

A 325 MHz aluminum prototype of a spatially periodic RF quadrupole focusing linac was developed at the Institute Modern Physics, Chinese Academy Sciences, as promising candidate for front end high-current linac. It consists an alternating series crossbar H-type drift tubes and sections. Owing to its special geometry, cavity fabrication is major hurdle engineering development application. In thi...

introduction: transhiatal esophagectomy is a widely accepted approach for palliative resection of subcarinal esophageal cancers. this study was designed to evaluate the necessity of routine thoracostomy tube insertion in this technique.  methods: this descriptive study was conducted on 123 consecutive patients with esophageal cancers undergoing transhiatal esophagectomy from march 2001 to febru...

هیدروفرمینگ لوله به‌طور گسترده، در تولید قطعات ساختاری اتومبیل استفاده می‌شود. یکی از خصوصیات تولید‌شده با این فرایند، نسبت استحکام به وزن بالا می‌باشد. لولۀ فشار پایین، روش‌های پیشنهاد‌شده برای حل مشکلات قبیل نیاز بالای سیال و آب‌بندی روش انجام پایین لوله، شبیه فشردن جسم جامد است آن برخلاف بالا، قالب بالایی طول فرایند ثابت نبوده هم‌زمان اعمال داخلی حرکت کرده را تحت قرار می‌دهد. مقاله، لوله‌های...

Abstract This paper presents the modeling of a cold forging process for rotary sleeve. The EN 42CrMo4 steel part was first modeled numerically by finite element method using simulation software DEFORM 3D ver. 11.0. After that, developed verified experimental tests carried out in laboratory conditions with use 1:2 scale tools and material model aluminum alloy AW-6060. Finite (FEM) results demons...

Electrodeposited aluminum films and template-synthesized aluminum nanorods are examined as negative electrodes for lithium-ion batteries. The lithium-aluminum alloying reaction is observed electrochemically with cyclic voltammetry and galvanostatic cycling in lithium half-cells. The electrodeposition reaction is shown to have high faradaic efficiency, and electrodeposited aluminum films reach t...