نتایج جستجو برای: roof

تعداد نتایج: 8289  

Journal: :The Journal of neuroscience : the official journal of the Society for Neuroscience 2006
Xun Cheng Ching-mei Hsu D Spencer Currle Jia Sheng Hu A James Barkovich Edwin S Monuki

The roof plate is a well known signaling center in CNS development, but its roles in the developing telencephalon and the common holoprosencephaly (HPE) malformation have been uncertain. Using cellular ablations in mice, we show that roof plate cell loss causes failed midline induction and HPE in the dorsal telencephalon. This morphologic phenotype is accompanied by selective deficits in midlin...

2013
Igor Kondrychyn Cathleen Teh Melvin Sin Vladimir Korzh

BACKGROUND Neurulation is driven by apical constriction of actomyosin cytoskeleton resulting in conversion of the primitive lumen into the central canal in a mechanism driven by F-actin constriction, cell overcrowding and buildup of axonal tracts. The roof plate of the neural tube acts as the dorsal morphogenetic center and boundary preventing midline crossing by neural cells and axons. METHO...

Journal: :Neuron 2003
Samantha J. Butler Jane Dodd

During spinal cord development, commissural neurons extend their axons ventrally, away from the roof plate. The roof plate is the source of a diffusible repellent that orients commissural axons in vitro and, thus, may regulate the trajectory of commissural axons in vivo. Of three Bmps expressed in the roof plate, BMP7, but not BMP6 or GDF7, mimics the roof plate activity in vitro. We show here ...

2015
Linjia Bai Yunfeng Zhang

Collapse of roof could cause severe economic loss and poses safety risk to residents in the building. This paper presents a nonlinear dynamic analysis of steel framed roof structures with force limiting devices under combined static and transient wind loading. Two types of force limiting devices – one with selfcentering behavior and the other exhibiting bilinear-like hysteresis are examined for...

Journal: :The American journal of sports medicine 1995
S M Howell S J Barad

This study determined that knee extension (range, -30 degrees to 2 degrees) and the slope of the intercondylar roof (range, 26 degrees to 46 degrees) vary widely between knees in both men and women. We found a weak relationship between knee extension and the slope of the intercondylar roof (r2 = 0.207); therefore, roof angle cannot be predicted by clinically measuring knee extension. CLINICAL R...

Journal: :Journal of orthopaedic research : official publication of the Orthopaedic Research Society 1997
B C Goss M L Hull S M Howell

Contact between an anterior cruciate ligament graft and the intercondylar roof has been termed roof impingement. Grafts with impingement sustain permanent damage, and if the injury is extensive enough, then the graft may fail, causing recurrent instability. This study evaluated two mechanical factors that could be responsible for the graft injury associated with roof impingement: an increase in...

1998
GERHARD MEISTER ANDRÉ ROTHKIRCH RAFAEL WIEMKER JOHANN BIENLEIN HARTWIG SPITZER

Remotely sensed images with a pixel size of about 1 m can nowadays be acquired by airborne scanners and in the near future also by high resolution satellites. With such a high spatial resolution, remotely sensed data of urban areas can resolve structures like a roof into the different surface segments with different inclinations, e.g. in the case of a gabled roof. We have measured the BRDF (Bid...

2013
Xiao-kun Jing Yuan-qi Li

Gable roof buildings are widely used in industrial buildings. Based on wind tunnel tests with rigid models, wind pressure distributions on gable roof buildings with different aspect ratios were measured simultaneously. Some characteristics of the measured wind pressure field on the surfaces of the models were analyzed, including mean wind pressure, fluctuating wind pressure, peak negative wind ...

Journal: :Journal of cardiovascular electrophysiology 2010
Caihua Sang Chenxi Jiang Jianzeng Dong Xingpeng Liu Ronghui Yu Deyong Long Ribo Tang Lingyun Gao Man Ning Gang Chen Weiju Li Changsheng Ma

OBJECTIVE The present study aimed to evaluate a new method for validation of complete linear block at the left atrial (LA) roof. BACKGROUND Linear lesions at the LA roof have been reported to improve the success rate of catheter ablation of atrial fibrillation (AF). METHODS Complete linear block at the LA roof was evaluated in 31 patients after complete isolation of pulmonary vein antrum (P...

2008
Aparajithan Sampath Jie Shan

This paper presents an approach to creating a polyhedral model of building roof from LiDAR point clouds using clustering techniques. A building point cloud is first separated into planar and breakline sections using the eigenvalues of the covariance matrix in a small neighbourhood. The planar components from the point cloud are then grouped into small patches containing 6-8 points and their nor...

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