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Time (T) violation can be related with charge-parity (CP) violation through the CPT theorem. The CP violation was discovered experimentally in the [K.sub.0]-meson decays about 35 years ago. The T […]

For the production of high-density ultracold neutrons (UCNs), we placed 0.8 K superfluid helium in a cold neutron moderator. We resolved previous heat-load problems in the spallation neutron source that were particularly serious below 1 K. With a proton-beam power of 400 MeV X 1 &mgr;A, a UCN production rate of 4 UCNcm-3 s-1 at the maximum UCN energy of Ec = 210 neV and a storage lifetime of 81 s were obtained. A cryogenic test showed that the production rate can be increased by a factor of 10 with the same storage lifetime by increasing the proton-beam power as well as 3He pumping speed. [ABSTRACT FROM AUTHOR]

Abstract: A neutron EDM measurement with a comagnetometer is discussed. For magnetometry, polarized xenon atoms are injected into a cylindrical cell where a cylindrically symmetric magnetic field and an electric field are applied for the EDM measurement. The geometric phase effect (GPE), which originates from particle motion in a magnetic field gradient, is analyzed in terms of the Dyson series. The motion of the xenon atom is largely suppressed because of a small mean free path. The field gradient is controlled by means of NMR measurements, where the false effect of Earthʼs rotation is removed. As a result, the GPE is reduced below . [Copyright &y& Elsevier]

We propose an access scheme for a synchroiious dualport (DP) SRAM that minimizes the 8T-DP-cell area and maintains cell stability. A priority row decoder circuit and shifted bit- line access scheme eliminates access conflict issues. Using 65 nm CMOS technology (hp90) with the proposed scheme, we fabricated 32 kB DP-SRAM macros. We obtained a 0.71 μm2 8T-DP-cell for which the cell size is only 1.44 x larger than a 6T-single-port (SP)- cell. The bit-density of the fabricated 32 kB DP-RAM macro is 667 kbit/mm2, which is 25% larger than a conventional 8T SRAM. The standby leakage is 27% less because of the small drive-NMOS transistor of the proposed 8T-DP-cell. [ABSTRACT FROM AUTHOR]

Abstract: An experiment on a Ramsey resonance for pulsed neutrons is discussed. The separated oscillatory fields for nuclear magnetic resonance were synchronized with a neutron pulse, and then the Ramsey resonance was observed as a function of the neutron velocity. The neutron spin was manipulated as a function of the neutron velocity. The phase of one of the oscillatory fields was modulated as a function of the neutron time of flight for a neutron velocity measurement. [Copyright &y& Elsevier]

We report on progress of the development of neutron spin filters based on polarized gaseous 3 He at KENS (Neutron Science Laboratory, KEK). 3 He polarizer cells made of quartz glass and sapphire are prepared and tested. Quartz glass cells with spin relaxation times of more than 100 h are routinely produced. A 3 He polarization of 63% has been achieved with a sapphire cell of a 3 He pressure of 3 atm, and with this 3 He cell, a neutron polarization of about 86% was obtained at thermal energy. [ABSTRACT FROM AUTHOR]

Magnoliae Cortex contains a range of bioactive components including terpenes (e.g. α-, β- and γ-eudesmol), phenylpropanoids (e.g. honokiol and magnolol) and alkaloids (e.g. magnocurarine). We recently reported that pretreatment of PC12 cells with Magnoliae Cortex extract significantly suppresses cytotoxicity induced by H 2 O 2 or 6-hydroxydopamine (6-OHDA) through the induction of drug-metabolizing and antioxidant enzymes. In this study, we investigated whether honokiol and magnolol, which are known to be active components of Magnoliae Cortex, induce drug-metabolizing enzymes and antioxidant enzymes in PC12 cells. We also examined the cytoprotective effect of honokiol and magnolol against H 2 O 2 or 6-OHDA induced cell death in PC12 cells. Our results revealed that honokiol and magnolol induced both NAD(P)H:quinone oxidoreductase 1 (NQO1) and catalase enzyme activities in a concentration-dependent manner. Pretreatment of PC12 cells with magnolol suppressed toxicity induced by H 2 O 2 or 6-OHDA. However, pretreatment of PC12 cells with honokiol showed only a suppressive effect on toxicity induced by H 2 O 2 . Our results suggest that the cytoprotective effect of Magnoliae Cortex extract on PC12 cells is mainly attributable to magnolol and only partially to honokiol.