A specially designed hemispherical deflector analyzer (HDA) with 5-element input lens having a movable entry position R0 suitable for electron energy analysis in atomic collisions was constructed and tested. The energy resolution of the HDA was experimentally determined for three different entry positions R0 = 84, 100, 112 mm as a function of the nominal entry potential V(R0) under pre-retardat...

A new kind of data model has recently emerged in which the database is not constrained by a conventional schema. Systems like ACeDB, which has become very popular with biologists, and the recent Tsimmis proposal for data integration organize data in tree-like structures whose components can be used equally well to represent sets and tuples. Such structures allow great exibility in data represen...

Due to product features such as production quality and high surface quality, cold forging extrusion methods are widely used in the of fasteners. Extrudability plays a key role during process is affected by many parameters. Die shape characteristics directly affect deformation. In particular, deformation hardening influenced characteristics. The also significantly affects mechanical properties. ...

conclusions in treatment of intra-articular distal radius fractures in middle-aged patients internal fixation with locking plates may be prefered to pin and plaster as the treatment of choice. results sf-36 test demonstrated a better general health (p < 0.001), mental health (p = 0.006), physical functioning (p < 0.001), social functioning (p < 0.001) and energy/fatigue (p < 0.001) in lcp group...

The formed parts of tubes easily interfere with the equipment when forming complex in 3D free bending technology. Consequently, to solve interferential phenomenon, an active deflection method (ADM) avoid interference was proposed drive deformed tube around its axis by controlling die. extended activity freedom without installing additional motion shafting. However, severe section distortion, su...

• A calibrated, stress-state based SPR process FE model is developed. The joining feasibility and joint quality of a wide range riveted connections investigated. High rivet leg inner radius values are shown to increase the quality. Low central tip depths relate high probabilities successful formation. Machine learning techniques can classify for riveting scenarios. Developing robust numerical s...

Sapphire dies (of single-crystal aluminum oxide) are used to obtain interfacial conditions along the contact surface of the die in a strip-drawing operation. Several solutions based on slip-line field analysis and upper-bound techniques are available for metal-forming problems. However, these solutions generally neglect elasticity and work-hardening and assume that friction is constant along th...

Hydro-joining is composed of hydro-piercing, hole flanging and nut-inlaying processes. In this study, a new hydro-flanging process combining hydro-piercing proposed. An internal pressured fluid used as the supporting medium instead rigid die. Three kinds punch head shapes are designed to explore thickness distribution flanged tube leakage effects between in process. A finite element code DEFORM...

A total of 367 Low Surface Brightness galaxies detected in the 2MASS all-sky near-infrared survey have been observed in the 21 cm H i line using the Arecibo telescope. All have a Ks-band mean central surface brightness, measured within a 5′′ radius, fainter than 18 mag arcsec. We present global H i line parameters for the 107 clearly detected objects and the 21 marginal detections, as well as u...

Let G be a graph of order n. The second stage adjacency matrix of G is the symmetric n× n matrix for which the ij entry is 1 if the vertices vi and vj are of distance two; otherwise 0. The sum of the absolute values of this second stage adjacency matrix is called the second stage energy of G. In this paper we investigate a few properties and determine some upper bounds for the largest eigenvalu...