When placed in a crowded environment, a semiflexible tube is forced to fold so as to make a more compact shape. One compact shape that often arises in nature is the tight helix, especially when the tube thickness is of comparable size to the tube length. In this paper we use an excluded volume effect to model the effects of crowding. This gives us a measure of compactness for configurations of ...

Nasopharyngeal Carcinoma (NPC) is a highly happening disease. Eustachain tube atrisia after radiotherapy is easy to occur in NPC patients. This study presented 2 cases of re-opening of Eustschian tube atresia after radiotherapy for NPC patients. Two female cases (62 and 64 y old; receiving postradiothapy 6 and 20 y ago, respectively) were diagnosed with Eustachian tube pharyngeal orifice atrisi...

In the laser forming process, a cooling time is usually considered between successive scans to increase temperature gradient and subsequently bending angle. this performed at ambient temperature, which can lead high in operation costs. The rate undesirable changes microstructure depending on type of material. research, by introducing simple method for applying forced with water different distan...

Neural-tube closure is a critical step of embryogenesis, and its failure causes serious birth defects. Coordination of two morphogenetic processes--convergent extension and neural-plate apical constriction--ensures the complete closure of the neural tube. We now provide evidence that planar cell polarity (PCP) signaling directly links these two processes. In the bending neural plates, we find t...

The sections composed of concrete and steel, which include concrete-encased concrete-filled tubes, generally have defects due to the low tensile strength of concrete. Therefore, an appropriate method was used for the combination of concrete-filled tubes (CFT) and prestressing strands which is encased in concrete. The conventional design guidelines are commonly developed for materials with norma...

Gas-phase fundamental and CH and CO overtone spectra (700-17 500 cm -I) of 2,2,2trideuteroacetaldehyde were recorded using FTIR and laser photoacoustic techniques. The Fermi resonance structure in the overtone spectra of the coupled CH stretching and in-plane CH bending vibrations is analyzed with a tridiagonal Hamiltonian, yielding a large effective coupling constant, I k ;bb I = 93 cm I, corr...