Density wave instability in a 2D dipolar Fermi gas

We consider a uniform dipolar Fermi gas in two-dimensions (2D) where the dipole moments of fermions are aligned by an orientable external field. We obtain the ground state of the gas in Hartree-Fock approximation and investigate RPA stability against density fluctuations of finite momentum. It is shown that the density wave instability takes place in a broad region where the system is stable against collapse. We also find that the critical temperature can be a significant fraction of Fermi temperature for a realistic system of polar molecules.Comment: 10 figure

Analytical Method of Active Ingredient in Glue-Line-Treated Plywood

A rather efficient method for quantitative analysis of the active ingredient in a glue-line-treated plywood was found by using formic acid and toluene in combination as the extraction solvents. A recovery rate of more than 95% was achieved

Dye sensitization of polymer/fullerene solar cells incorporating bulky phthalocyanines

The light-harvesting efficiency of P3HT:PCBM solar cells can be improved by incorporating near-IR dye molecules such as silicon phthalocyanine derivatives with bulky axial groups (SiPc). In order to study the size effect of the axial groups on the dye sensitization in P3HT:PCBM solar cells, we synthesized five SiPc derivatives with different axial groups: SiPc[OSi(C_{n}H_{2n+1})_{3}]_{2} (SiPcn, n = 2, 3, 4, 6) and SiPc[OSi(iBu)_{2}C_{18}H_{37}]_{2} (SiPcB18). The power conversion efficiency (PCE) increased in the order of n = 2–4, reached the maximum at around n = 4 and 6, and then decreased for SiPcB18 with the longest axial groups. As a result, the PCE was improved to 4.2%, which is larger by 10% than that of P3HT:PCBM control cells without dye molecules. We therefore conclude that the butyl or hexyl chain in the axial ligand is the most appropriate for the dye sensitization in P3HT:PCBM solar cells

Continuous perfusion of pulmonary arteries during total cardiopulmonary bypass favorably affects levels of circulating adhesion molecules and lung function

AbstractObjectives: Lung injury is a serious complication of cardiopulmonary bypass in infants with congenital heart disease and pulmonary hypertension. Cessation of blood flow in the pulmonary arteries during cardiopulmonary bypass is known to provoke lung dysfunction. We assessed the effect of continuous pulmonary perfusion on circulating adhesion molecules and on lung function. Methods: Fourteen infants with congenital heart disease and pulmonary hypertension were enrolled in the study. During total cardiopulmonary bypass, 8 patients underwent continuous perfusion of the pulmonary arteries (perfusion group), and the remaining 6 patients did not (control group). Plasma levels of circulating intercellular adhesion molecule 1, soluble granule membrane protein 140, and sialyl Lewisx and PaO2/fraction of inspired oxygen ratios were measured before commencement and serially for 24 hours after termination of bypass. Results: Plasma levels of circulating intercellular adhesion molecule 1 decreased significantly at the termination of bypass in both groups but returned to prebypass levels immediately in the control group, whereas in the perfusion group the values remained significantly less than those before bypass. Plasma levels of soluble granule membrane protein 140 in the control group were significantly higher at 6 and 12 hours after bypass than levels before bypass, whereas in the perfusion group the values remained at the prebypass level throughout the postbypass period. Trends of plasma levels of sialyl Lewisx were alike in both groups. PaO2/fraction of inspired oxygen ratios in the control group decreased significantly from 6 hours after bypass, whereas values in the perfusion group remained at the prebypass value throughout the postbypass period. Conclusions: This study suggests that in infants having congenital heart disease and pulmonary hypertension, continuous pulmonary perfusion during total cardiopulmonary bypass minimizes ischemic insult and neutrophil-endothelial interaction mediated by adhesion molecules in the pulmonary microvessels.J Thorac Cardiovasc Surg 2001;122:242-

Random Walk or A Run: Market Microstructure Analysis of the Foreign Exchange Rate Movements based on Conditional Probability

Using tick-by-tick data of the dollar-yen and euro-dollar exchange rates recorded in the actual transaction platform, a "run" -- continuous increases or decreases in deal prices for the past several ticks -- does have some predictable information on the direction of the next price movement. Deal price movements, that are consistent with order flows, tend to continue a run once it started i.e., conditional probability of deal prices tend to move in the same direction as the last several times in a row is higher than 0.5. However, quote prices do not show such tendency of a run. Hence, a random walk hypothesis is refuted in a simple test of a run using the tick by tick data. In addition, a longer continuous increase of the price tends to be followed by larger reversal. The findings suggest that those market participants who have access to real-time, tick-by-tick transaction data may have an advantage in predicting the exchange rate movement. Findings here also lend support to the momentum trading strategy.