Theory of two-dimensional macroscopic quantum tunneling in a Josephson junction coupled with an LC circuit

We investigate classical thermal activation (TA) and macroscopic quantum tunneling (MQT) for a Josephson junction coupled with an LC circuit theoretically. The TA and MQT escape rate are calculated analytically by taking into account the two-dimensional nature of the classical and quantum phase dynamics. We find that the MQT escape rate is largely suppressed by the coupling to the LC circuit. On the other hand, this coupling gives rise to slight reduction of the TA escape rate. These results are relevant for the interpretation of a recent experiment on the MQT and TA phenomena in grain boundary YBCO Josephson junctions.Comment: 4 pages, 1 figure, Proceedings of LT2

Comparison of Sustained Hemodiafiltration with Acetate-Free Dialysate and Continuous Venovenous Hemodiafiltration for the Treatment of Critically Ill Patients with Acute Kidney Injury

We conducted a prospective, randomized study to compare conventional continuous venovenous hemodiafiltration (CVVHDF) with sustained hemodiafiltration (SHDF) using an acetate-free dialysate. Fifty critically ill patients with acute kidney injury (AKI) who required renal replacement therapy were treated with either CVVHDF or SHDF. CVVDHF was performed using a conventional dialysate with an effluent rate of 25 mL·kg−1 · h−1, and SHDF was performed using an acetate-free dialysate with a flow rate of 300−500 mL/min. The primary study outcome, 30 d survival rate was 76.0% in the CVVHDF arm and 88.0% in the SHDF arm (NS). Both the number of patients who showed renal recovery (40.0% and 68.0%, CVVHDF and SHDF, resp.; P < .05), and the hospital stay length (42.3 days and 33.7 days, CVVHDF and SHDF, resp.; P < .05), significantly differed between the two treatments. Although the total convective volumes did not significantly differ, the dialysate flow rate was higher and mean duration of daily treatment was shorter in the SHDF treatment arm. Our results suggest that compared with conventional CVVHDF, more intensive renal support in the form of post-dilution SHDF with acetate-free dialysate may accelerate renal recovery in critically ill patients with AKI

Spectroscopic estimation of the photon number for superconducting Kerr parametric oscillators

Quantum annealing (QA) is a way to solve combinational optimization problems. Kerr nonlinear parametric oscillators (KPOs) are promising devices for implementing QA. When we solve the combinational optimization problems using KPOs, it is necessary to precisely control the photon number of the KPOs. Here, we propose a feasible method to estimate the photon number of the KPO. We consider coupling an ancillary qubit to the KPO and show that spectroscopic measurements on the ancillary qubit provide information on the photon number of the KPO

Studies on the sulfur uptake by porphyra tenera and ulva pertusa, using 35S

　アオサを35SO4，添加海水で、培養し熱水可溶，不溶， 80%アノレコール可溶，不容の各成分への硫黄の移行を時間的lこ追究した.またアサクサノリ及びアオサを同様に48時間培養し，同じく各成分への硫黄の移行を調べ，更にアノレコール可溶部分については， イオン交換樹脂を用いacidic，basic 及びneutral の3 fraction に分割し，各fraction における硫黄の動向について考察した. ① アオサでは硫黄の大部分は熱水可溶部及びその80% アノレコール不溶部にかなり短時間に入り24時間乃至48時間後lこはほぼ平衡に達する. ② 80%アノレコール可溶の部分ではやや異なり，培養開始後24時間までは比絞的緩慢であるが，その後はかなり大きく増加する. ③ アサクサノリ，アオサいずれも80%アルコール不溶の部分に多く吸収され， 80%アノレコール可容の部分ではアサクサノリの方がアオサに比して少い. ④ このfraction にはtaurine，cysteic acid， cysteinolic acid などのようなアミノスルフォン酸の存在が認められ，それらへの移行が考えられるが確認は出来なかった.The time-course of sulfur uptake and transferring to the fronds of Ulva pertusa was investigated, by means of culturing for I, 6, 12, 24 and 48 hours in the media added 35S04 • Distribution of sulfur and 35S-actiyity in the fronds were looked over from the fractions separated under the procedure of Text-fig. I. And also the sulfur uptake of Porphya tenera and of Ulva pertusa were compared, after the culturing for 48 hours with 35SO4 • The results are as follows. (1) 35S was taken rapidly into each fraction from the outset by Ulva pertusa and poised after 48 hours (see Table 1). (2) However, in the 80% ethanol soluble fraction, 35S-activity increased slowly at the beginning of culture, but after 24 hours, became faster. (3) Making a comparison between Porphyra tenera and Ulva pertusa, a good deal of 35S was taken up into the 80 % ethanol insoluble fractions of both, on the contrary, less activity was found in the 80 % ethanol soluble fraction of Porphyra tenera than Ulva pert usa (see Table 2). (4) In the latter fractions, there were found sulfonyl amino compounds such as taurine, cysteinolic acid or cysteic acid in either Porphyra tenera or Ulva pertusa. It is probable that 35 S-activity exists in these compounds

HT-FED2004-56812 RETRACTION AND BREAKUP OF AN INITIALLY STRETCHED LIGAMENT

ABSTRACT Unsteady motion of an initially stretched ligament in another immiscible fluid is studied numerically for the flow dominated by both inertia and viscosity. Numerical simulations were conducted using an axisymmetric version of a Front-Tracking / Finite Difference code. The ranges of the non-dimensional num