A case of recanalized basilar artery following basilar artery occlusion due to spontaneous dissection

An 85-year-old man who did not have any previous history of heart disease was admitted to our hospital with the chief complaints of disturbance of consciousness, tetraparesis, and bilateral Babinski signs. On admission, intravenous digital subtraction angiography (DSA) showed bilatral vertebral arteries without filling the basilar artery. On the second hospital day, MRI showed a septum in the basilar artery, and no infarctions were noted in the brain stem. He gradually improved with heparin therapy. On the tenth hospital day, intravenous DSA disclosed filling of the basilar artery. On the sixteenth hospital day, conventional cerebral angiography revealed filling of the basilar artery from the left vertebral artery, and string sign and linear shadow (intimal flap) was noted in the basilar artery. He was diagnosed to have the basilar artery dissection. The patient became ambulatory and was discharged independently. This is very rare case of the basilar artery dissection with a good prognosis.     

Fracture toughness and fatigue crack propagation in high strength steel from room temperature to −180°c

Fracture toughness under tensile test and fatigue test on high strength steel at temperature ranging from room temperature to ?180°C were experimentally studied. The value of fracture toughness under fatigue test is considerably tower than that obtained under tensile test.Within the range from room temperature to ?100°C the following results were obtained: the power coefficient δ of the fatigue crack propagation rate $\text{[(dc)/(dN)] = AΔK}{}^5$ is related with [(1)/($\text{T}$)] as: $\text{δ = b}{}_1\text{+ [(a}{}_1\text{)/(kT)]}$. $\text{[(dc)/(dN)]}$ shows Arrhenius type, and, however, different equation from usual stress dependent rate process equation. The trend is in good agreement with the dislocation dynamics theory of fatigue crack propagation.     

Difference between mechanochemical and thermal processes of polymorphic transformation of ZnS and PbO

Mechanochemical and thermal processes of the polymorphic transformations, litharge ? massicot and wurtzite ? zinc blende were compared. Massicot transformed readily to litharge with a slight mechanical stimulation at room temperature whereas the mechanochemical transformation in the opposite direction was almost impossible. The wurtzite ? zinc blende transformation was similar. On the other hand, simple heating of litharge at temperatures higher than 673K enabled the transformation into massicot without any difficulty. Wurtzite was also formed on heating zinc blende without any mechanical aids. The reason for this kind of apparent irreversibility of the transformation, being topotactic and including layer structures, is discussed.     

Theoretical evaluation of carbon monoxide and hydrocarbon reduction by secondary-air injection

In order to evaluate the effects of various factors upon the performance of a thermal reactor with secondary-air injection which reduces carbon monoxide (CO) and hydrocarbon emitted from combustion engines, analytical studies were carried out for a model in which one-dimensional flow of gas is assumed. Effects of factors such as gas temperature, injection rate of secondary air, residence time and air/fuel ratio of the engine have been examined by chemical kinetics, taking 20 chemical species and 52 elementary reactions into consideration. The oxidation rate of CO and methane (CH₄) becomes high when the gas temperature after air injection exceeds about 900 K. For a given gas temperature, there exists an appropriate range for the quantity of injection air in which CO, CH₄ and formaldehyde can be reduced effectively. This range can be widened by either raising the gas temperature or prolonging the residence time. By increasing the air/fuel ratio of the engine, CO and CH₄ emitted from the reactor tend to decrease. These results explain reasonably well the phenomena formerly observed experimentally.     

Seamless proactive handover across heterogeneous access networks

Dual-mode handsets and multimode terminals are generating demand for solutions that enable convergence and seamless handover across heterogeneous access networks. The IEEE 802.21 working group is creating a framework that defines a Media Independent Handover Function (MIHF), facilitates handover across heterogeneous access networks, and helps mobile users experience better performance during mobility events. In this paper, we describe this 802.21 framework and also summarize a Media-independent Pre-Authentication (MPA) mechanism currently under discussion within the IRTF that can further optimize handover performance. We discuss how the 802.21 framework and the MPA technique can be integrated to improve handover performance. Finally, we describe a test-bed implementation and validate experimental performance results of the combined mobility technique.     

A body-mounted camera system for head-pose estimation and user-view image synthesis

In this paper, we propose a body-mounted system to capture user experience as audio/visual information. The proposed system consists of two cameras (head-detection and wide angle) and a microphone. The head-detection camera captures user head motions, while the wide angle color camera captures user frontal view images. An image region approximately corresponding to user view is then synthesized from the wide angle image based on estimated human head motions. The synthesized image and head-motion data are stored in a storage device with audio data. This system overcomes the disadvantages of head-mounted cameras in terms of ease of putting on/taking off the device. It also has less obtrusive visual impact on third persons. Using the proposed system, we can simultaneously record audio data, images in the user field of view, and head gestures (nodding, shaking, etc.) simultaneously. These data contain significant information for recording/analyzing human activities and can be used in wider application domains such as a digital diary or interaction analysis. Experimental results demonstrate the effectiveness of the proposed system.     

GAM-4: a novel microporous silicoaluminophosphate crystal formed by the interzeolite conversion of SAPO-5 zeolite

Journal of Porous Materials - The interzeolite conversion of silicoaluminophosphate-type zeolite, SAPO-5 with AFI topology, was performed using a cyclic secondary amine, pyrrolidine, as an organic...     

γ-Ray measurements in boron neutron capture therapy using BeO ceramic thermoluminescence dosimeter

Journal of Materials Science: Materials in Electronics - In boron neutron capture therapy (BNCT), neutrons and γ-rays cause different biological effects, and it is necessary to discriminate...