نتایج جستجو برای: cold forming machine
تعداد نتایج: 477734 فیلتر نتایج به سال:
Aims. The purpose of this study is to examine the prediction that the deuterated H + 3 ion, H 2 D + , can be found exclusively in the coldest regions of molecular cloud cores. This is also a feasibility study for the detection of the ground-state line of ortho-H 2 D + at 372 GHz with APEX. Methods. The (1 10 → 1 11) transition of H 2 D + at 372 GHz was searched towards selected positions in the...
To determine the force and energy parameters of cold roll-beating external splines, characteristics deformation zone in are analysed. The geometric dimensions position change with movement roller, contact arc, reduction very small, there is an incomplete initial stage roll-beating. A discrete analytical method for calculating unit pressure proposed, process discretized into infinite number cold...
Magnesium alloys have, in recent years, been recognized as highly promising biodegradable materials, especially for vascular stent applications. Forming of magnesium alloys into high-precision thin-wall tubes has however presented a technological barrier in the fabrication of vascular stents, because of the poor workability of magnesium at room temperature. In the present study, the forming pro...
To study the cold-forming effect on yield strength distribution of cold-formed thick-walled steel, material tensile tests and axial compression were conducted steel-lipped channels. undertake tests, five types lipped channel sections with varied thicknesses nominal strengths selected. The test samples taken from web, flange, curled edge, corner sections, respectively. Next, a corresponding mode...
BACKGROUND This study compared the use of static cold storage versus continuous hypothermic machine perfusion in a cohort of kidney transplant recipients at high risk for delayed graft function (DGF). METHODS In this national, multicenter, and controlled trial, 80 pairs of kidneys recovered from brain-dead deceased donors were randomized to cold storage or machine perfusion, transplanted, and...
Trace elements of quartz document the physical-chemical evolutions growth, which has been a great and most applied tool in study geological settings quartz-forming environments. A classic method is using graphic diagram plots visualizing trace element discriminations trends, examples including Al-Ti (Rusk, 2012, https://doi.org/10.1007/978-3-642-22161-3_14) Ti-Al-Ge (Schrön et al., 1988, https:...
The goal of recommender system is to provide desired items for users. One of the main challenges affecting the performance of recommendation systems is the cold-start problem that is occurred as a result of lack of information about a user/item. In this article, first we will present an approach, uses social streams such as Twitter to create a behavioral profile, then user profiles are clusteri...
Cold orbital forging (COF) as an advanced incremental metal-forming technology has been widely used in processing vehicle parts. During the COF process, vibration on machine injures service life of and quality forged part. The study control is therefore necessary. In this study, dynamic model established, performances some key positions are obtained using Matlab&Simulink software. Subsequen...
background: human error is the most important cause of occupational and non-occupational accidents. because, it seems necessary to identify, predict and analyze human errors, and also offer appropriate control strategies to reduce errors which cause adverse consequences, the present study was carried out with the aim of identifying human errors while operating meat grinder and offer suggestions...
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