Diffusion in a comb-like structure, formed by a main cylindrical tube with identical periodic dead ends of cylindrical shape, occurs slower than that in the same system without dead ends. The reason is that the particle, entering a dead end, interrupts its propagation along the tube axis. The slowdown becomes stronger and stronger as the dead end length increases, since the particle spends more...

Distinct cell types differentiate along the dorsoventral axis of the neural tube. We have cloned and characterized a novel member of the TGF beta gene family, dorsalin-1 (dsl-1), that appears to regulate cell differentiation within the neural tube. dsl-1 is expressed selectively in the dorsal neural tube, and its pattern of expression appears to be restricted by early signals from the notochord...

A tube (resp. an oval tube) in PG(3, q) is a pair T = {L,L}, where {L} ∪ L is a collection of mutually disjoint lines of PG(3, q) such that for each plane π of PG(3, q) containing L the intersection of π with the lines of L is a hyperoval (resp. an oval). The line L is called the axis of T . We show that every tube for q even and every oval tube for q odd can be naturally embedded into a regula...

BACKGROUND Analysis of right ventricular adaptation to tricuspid regurgitation was studied in 10 heart transplant recipients following inadvertent endomyocardial biopsy disruption of the tricuspid apparatus. METHODS AND RESULTS Echocardiography demonstrated progressive diastolic right ventricular cavity enlargement (19.5+/-5.0 to 30.3+/-5.4 cm(2), P<0.0002), with disproportionate elongation a...

In this paper, simulation and analysis of thin steel cylindrical shells with elliptical cutouts under oblique loading were studied using finite element method. First, the numerical results were validated by the results of experimental test performed by an INSTRON 8802 servo hydraulic machine. Also, the effect of cutout angle (θ), cutout size, cutout position (L0/L) and cutout aspect ratios (b/a...

in this paper, we investigate variation of the wavelength, intensity and polarization of the self-assembled inas/gaas quantum dots emission by microphotoluminescence spectroscopy at the liquid helium temperature. the microcavity wafer sample is grown by molecular beam epitaxy (mbe) and chemically etched into the micropillar structure (with elliptical cross section - long and short axis 2µm×1.5µ...

This paper approaches the problem of detecting the orientation of an object while the object is grasped by a robot. Manipulator robots are learning new and exciting ways to interact with their environment every day. Object recognition and grasping algorithms allow a robot to identify, target, and grasped objects of importance. However, a common problem in grasping is maintaining knowledge of th...

In the present era of architecture, different cross-sectional shapes structural concrete elements have been utilized. However, this change in shape has a significant effect on load-carrying capacity. To restore this, use column confinements with elliptical sections gained attention. This paper aim to investigate confined reinforced Carbon Fiber Reinforced Polymer (CFRP) and steel tube axial stu...

The Rotary-Draw Bending (RDB) process is a distinguished process employed for the precision cold bending of a hollow tube with small radius bends using Numerical Control (NC) machines. This research presents an analytical model based on the power law hardening model for the RDB processing of rectangular thin tubes. Based on the constraints of the tube in the dies and its thinness, the plane str...

The establishment of anteroposterior (AP) polarity in the early mouse epiblast is crucial for the initiation of gastrulation and the subsequent formation of the embryonic (head to tail) axis. The localization of anterior and posterior determining genes to the appropriate region of the embryo is a dynamic process that underlies this early polarity. Several studies indicate that morphological and...