Simultaneous Measurements of an Ultrasound and a Torsional Oscillator for 4He in a Nanoporous Glass

Previously, we carried out ultrasonic measurements for liquid ⁴He filled in a nanoporous glass (Gelsil), and observed an increase in the sound velocity due to decoupling of the superfluid component. At zero pressure, the superfluid transition temperature T _C is suppressed to 1.4 K from the bulk lambda point, 2.17 K. This behavior is the same as torsional oscillator measurements by Yamamoto et al. (Phys. Rev. Lett. 93:075302, 2004). However, the pressure dependence of T _C and the temperature dependence of the superfluid fraction are very different from the torsional oscillator measurements. In order to clarify the origin of the difference, we have developed a new technique of simultaneous measurement of an ultrasound and a torsional oscillator, and the system successfully works for a nanoporous glass. Here, we compare decoupling of the superfluid component for ⁴He films between an ultrasound and a torsional oscillator.     

Catalytic Activities of Alcohol Transformations Over 8-Ring Zeolites

Aluminosilicate H/CHA and H/MTF zeolites show remarkably different catalytic activities in the methanol and ethanol transformations although they have similar pore size of 8-membered ring structures. Moreover, the produced ethylene is further converted on H/CHA, but H/MTF is not active for the ethylene transformation. The correlations between the distinct catalytic differences and their intrinsic structural properties, including topology and acidity, are discussed.     

Organic LED full-color passive-matrix display

Abstract— A full-color 5.2-inch 1/4-VGA passive-matrix organic LED display has been developed, adopting selective deposition for the different emitting materials. The display features 320 (×3) × 240 pixels with an equivalent pixel size of 0.33 × 0.33 mm, white peak luminance of over 150 cd/m², and power consumption of 6 W.     

Theoretical analysis of transient gain phenomena in a fast-axialflow type CO2 laser amplifier

A decrease of output power observed after discharging plasma tubes in a fast-axial flow CO₂ laser amplifier with a short dwell time of about 1 ms is discussed. For the 10P(18) line at 50 torr pressure, the small-signal gain goes from 1.308/m to 1.068/m within 135 s after discharging the plasma tubes, for a gas-flow velocity of 180 m/s and discharge current of 60 mA. The fraction of power decrease is about 15% for the plasma length of 80 cm and the input power of 5 W. Dependences of the observed fraction of power-down and the transient time to reach a stable power on input power and plasma length are theoretically analyzed by introducing the CO₂ dissociation factor as a function of gas-flow velocity, discharge current and plasma length, and gain saturation, resulting in good agreement between the experimental results and computation     

激光诱发光致发光光谱分析在宝石学中的应用——以钻石为例

确定钻石的颜色成因如今已变得越来越重要. 事实上相似颜色的钻石有不同的颜色成因, 如天然的、辐照的、 HPHT处理的或合成的. 借助拉曼显微镜Renishaw Ramanscope System 100B和用514 nm的Ar激光作激发源, 用液氮在-150℃条件下对钻石进行测定, 来研究激光诱发光致发光分析用于确定钻石颜色成因的可靠性.     

Oxidative Dehydrogenation of Propane with CO2 Over Cr/H[B]MFI Catalysts

Abstract  

Cr/silicalite-1 and Cr/H[B]MFI catalysts were prepared by the impregnation method, and Cr/H[B]MFI were further treated by steaming. The catalysts were employed for the oxidative dehydrogenation of propane to propylene with CO₂ as the oxidant. Cr/H[B]MFI showed significantly higher catalytic activity than Cr/silicalite-1, and steamed Cr/H[B]MFI was superior in the reaction stability to Cr/H[B]MFI. The nature of the supported chromium species have been characterized by a number of physicochemical techniques, such as Raman, UV–vis and NMR. It is concluded that the steaming led to the auto-reduction of some Cr⁶⁺ to Cr³⁺, and resultant Cr³⁺ species might be located near the boron center in the borosilicate framework to counterbalance the negative charge of the framework. The transformation of Cr⁶⁺ species to Cr³⁺ species, facilitated by the steaming process and the presence of boron in the catalyst, is responsible for the enhanced stability of oxidative dehydrogenation of propane to propylene with carbon dioxide as the oxidant.     

Reliabilities and concurrent validities of popular self-report measures of depression, anxiety, and social desirability.

135 male and 256 female undergraduates completed the Self-Rating Depression Scale, Beck Depression Inventory, Depression Adjective Check Lists, State-Trait Anxiety Inventory, Taylor Manifest Anxiety Scale, S-R Inventory of Anxiousness, Marlowe-Crowne Social Desirability Scale, and Edwards Social Desirability Scale. Pearson correlation coefficients indicated strong relationships between measures of depression and between measures of anxiety. However, pairs of anxiety and depression measures correlated almost as strongly. All depression and anxiety measures were significantly associated with the Edwards Social Desirability Scale. Findings question the use of a self-report measure of depression to select "depressed" Ss among college students. (34 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

One-Dimensional Phonon State of 4He Films Adsorbed in Straight Nanopores

We have studied heat capacities of ⁴He adsorbed in straight nanopores 1.8, 2.2, and 2.8 nm in diameter. Heat capacities of the ⁴He fluid film on the solid layer at 0.08–0.4 K show power laws close to T in 1.8 nm pores, close to T ² in 2.8 nm pores, and a crossover from T to T ² with increasing temperature in 2.2 nm pores. These heat capacities are explained by a model assuming a phonon dispersion with continuous one-dimensional (1D) states in the axial direction and discrete energy levels in the azimuthal direction. By fitting experimental data to the model, the phonon velocity along the pore axis and the energy gap for propagation in the cross section are derived. At temperatures sufficiently lower than the energy gap, where the thermal wave length of phonons is much longer than the effective pore diameter, the ⁴He fluid films show a T-linear heat capacity of 1D phonons propagating only along the pore axis. At higher temperatures, a 1D-2D crossover of phonons occurs.      

Gianotti-Crosti syndrome associated with cytomegalovirus antigenemia after bone marrow transplantation

Gianotti-Crosti syndrome (GCS) is characterized by a distinctive self-limiting acral papular or papulovesicular eruption associated with an underlying viral illness. It has not been previously reported in patients post-bone marrow transplantation. We report a 6-year-old Japanese boy who underwent allogeneic bone marrow transplantation from an unrelated donor for acute lymphoblastic leukemia (ALL) in second remission. He had clinical and histopathologic findings characteristic of GCS and evidence of subclinical infection with cytomegalovirus (CMV) detected by CMV antigenemia assay. It is likely that CMV is the causative agent for the GCS in this case.