Superconducting SET with tunable electromagnetic environment

We have studied the environmental effect on superconducting single-electron transistors (S-SETs) by biasing S-SETs with arrays of small-capacitance dc SQUIDs, whose effective impedance can be varied in situ. As the zero-bias resistance of the arrays is increased, Coulomb blockade in the S-SET becomes sharper, and the gate-voltage dependence changes from e-periodic to 2e-periodic. The SQUID arrays could be used as on-chip noise filters.Comment: 2 pages, 3 embedded figures, submitted to LT23 proceedings. Error in Fig. 1 has been fixe

XXZ chain with a boundary

The \XXZ spin chain with a boundary magnetic field $h$ is considered, using the vertex operator approach to diagonalize the Hamiltonian. We find explicit bosonic formulas for the two vacuum vectors with zero particle content. There are three distinct regions when $h\geq0$, in which the structure of the vacuum states is different. Excited states are given by the action of vertex operators on the vacuum states. We derive the boundary $S$-matrix and present an integral formula for the correlation functions. The boundary magnetization exhibits boundary hysteresis. We also discuss the rational limit, the \XXX model.Comment: LaTeX 38 pages, 3 figures; epsf, epic, eepic. (Minor changes in text, and references added

腎細胞癌患者血清中の抗腫瘍抗体について

腎細胞癌19例の血清につき, ヒト腎細胞癌培養株OUR-10に対する抗腫瘍抗体を51Cr release法によるcomplement-dependent cytotoxicity (CDC)とantibody-dependent cell-mediated cytotoxicity (ADCC)の各assayで検討した.19例中8例に抗RCC抗体を認め, OUR-10に対する殺細胞性抗体は補体依存性抗体とし同定した.抗RCC抗体陽性患者では理学的にlow grade例に陽性率が有意に高く臨床的stageとの関係はなかったThe circulating anti-RCC cytotoxic antibodies of eighteen RCC patients, preoperatively, and one inoperable case were studied by 51Cr release CDC and ADCC assays, using the cultured human RCC cell line, OUR-10. Circulating cytotoxic anti-RCC antibodies were detected in eight patients as CDC antibodies. The patients with a low pathological grade had a significantly higher percentage (P less than 0.05) of positive antibody responses