Development of a large area gas photomultiplier with GEM/μ\muPIC

We are developing a new photon detector with micro pattern gaseous detectors. A semitransparent CsI photocathode is combined with 10cm$\times$10cm GEM/$\mu$PIC for the first prototype which is aimed for the large liquid Xe detectors. Using Ar+C$_2$H$_6$ (10%) gas, we achieved the gas gain of $10^5$ which is enough to detect single photoelectron. We, then, irradiated UV photons from a newly developed solid scintillator, LaF$_3$(Nd), to the detector and successfully detected single photoelectron.Comment: Poster presentation at ICHEP08 Philadelphia, USA, July 2008. 3 pages, LaTeX, 4 eps figure

カハンガタ カンキョウ シリョウ チュウ ジュウキンゾク ノウド ブンセキケイ ノ コウキノウカ : セレン (IV) ノ マイクロカラム チャクショク ニ モトズク モクシ ケイコウ テイリョウホウ

A visible colorimetric sensing device for determination of selenium(VI) is proposed. This method is simply measuring the fluorinated coloration length of a microcolumn to determination Se(IV). The extension of the length of color band was generated by accumulation of a fluorescence reactant (Se-DAN) between Se(VI) and diaminonaphtalene (DAN) on an adsorbent in a micorcolomn. Modification with β-cyclodextrin on octadecyl functional groups (C18)-modified beads as adsorbent of Se-DAN enhanced the florescence. A detection limit of 30 μg L-1 for Se with a linear range up to 150 μg L-1 was obtained. The determination scheme was successfully applied to the analysis of a sample of tap water

Boundedness and stabilization in a three-dimensional two-species chemotaxis-Navier-Stokes system

summary:This paper is concerned with the two-species chemotaxis-Navier–Stokes system with Lotka–Volterra competitive kinetics \begin{align*} \begin{cases} (\n1)_t+u\cdot\na\n1 =\D\n1-\chi_1\na\cdot(\n1\na c)+\mu_1\n1(1-\n1-a_1\n2) &\text{in}\ \om\times(0,\infty), \\ (\n2)_t+u\cdot\na\n2 =\D\n2-\chi_2\na\cdot(\n2\na c)+\mu_2\n2(1-a_2\n1-\n2) &\text{in}\ \om\times(0,\infty), \\ \h{6.3mm}c_t+u\cdot\na c =\D c-(\alpha\n1+\beta\n2)c &\text{in}\ \om\times(0,\infty), \\ \h{3.1mm}u_t+(u\cdot\na)u =\D u+\nabla P+(\gamma\n1+\d\n2)\na\Phi, \quad\na\cdot u=0 &\text{in}\ \om\times(0,\infty) \end{cases} \end{align*} under homogeneous Neumann boundary conditions and initial conditions, where is a bounded domain in R3 with smooth boundary. Recently, in the 2-dimensional setting, global existence and stabilization of classical solutions to the above system were first established. However, the 3-dimensional case has not been studied: Because of difficulties in the Navier–Stokes system, we can not expect existence of classical solutions to the above system. The purpose of this paper is to obtain global existence of weak solutions to the above system, and their eventual smoothness and stabilization