Development of cosmic x-ray polarimeter

We present a performance study of a cosmic X-ray polarimeter which is based on the photoelectric effect in gas, and sensitive to a few to 30 keV range. In our polarimeter, the key device would be the 50 μm pitch Gas Electron Multiplier (GEM). We have evaluated the modulation factor using highly polarized X-ray, provided by a synchrotron accelerator. In the analysis, we selected events by the eccentricity of the charge cloud of the photoelectron track. As a result, we obtained the relationship between the selection criteria for the eccentricity and the modulation factors; for example, when we selected the events which have their eccentricity of > 0.95, the polarimeter exhibited with the modulation factor of 0.32. In addition, we estimated the Minimum Detectable Polarization degree (MDP) of Crab Nebula with our polarimeter and found 10 ksec observation is enough to detect the polarization, if we adopt suitable X-ray mirrors

Development of cosmic x-ray polarimeter

We present a performance study of a cosmic X-ray polarimeter which is based on the photoelectric effect in gas, and sensitive to a few to 30 keV range. In our polarimeter, the key device would be the 50 μm pitch Gas Electron Multiplier (GEM). We have evaluated the modulation factor using highly polarized X-ray, provided by a synchrotron accelerator. In the analysis, we selected events by the eccentricity of the charge cloud of the photoelectron track. As a result, we obtained the relationship between the selection criteria for the eccentricity and the modulation factors; for example, when we selected the events which have their eccentricity of > 0.95, the polarimeter exhibited with the modulation factor of 0.32. In addition, we estimated the Minimum Detectable Polarization degree (MDP) of Crab Nebula with our polarimeter and found 10 ksec observation is enough to detect the polarization, if we adopt suitable X-ray mirrors

A case of soft palate schwannoma that developed with obstructive sleep apnea syndrome (OSAS)

Obstructive sleep apnea syndrome (OSAS) caused by tumors in the upper airway is a relatively rare entity. In this report, we present a soft palate schwannoma causing latent OSAS. Schwannoma in the soft palate itself is rare and, to our best knowledge, has never been reported to cause OSAS. Although the OSAS improved after surgery, it had been severe without the patient noticing it. We should consider the possibility of latent OSAS in patients with tumors in the upper airway. In addition, we also should consider the possibility of a latent tumor in the upper airway in OSAS patients. Keywords: Obstructive sleep apnea syndrome, Schwannoma, Soft palate tumo

DLB カンジャニ オケル ゲンチョウ ノ リンショウテキ トクチョウ ： ゲンシ ノ サウンドトラック

博士(医学)熊本大

Nonlinear modelling of three phase multi limb transformers

SIGLEAvailable from British Library Document Supply Centre-DSC:DXN019237 / BLDSC - British Library Document Supply CentreGBUnited Kingdo