Advanced Experimental Techniques for RF and DC Breakdown Research

Advanced experimental techniques are being developed to analyze RF and DC breakdown events. First measurements with a specially built spectrometer have been made with a DC spark setup [1] at CERN and will soon be installed in the CLIC 30GHz accelerating structure test stand to allow comparison between DC and RF breakdown phenomena. This spectrometer is able to measure the light intensity development during a breakdown in narrow wavelength bands in the visible and near infrared range. This will give information about the important aspects of the breakdown including chemical elements, temperature, plasma parameters and possibly precursors of a breakdown

Demonstrating the high Voc potential of PEDOT:PSS/c-Si heterojunctions on solar cells

In this study, we demonstrate the high surface passivation quality of PEDOT:PSS/c-Si junctions for the first time on solar cell level, reaching a record high Voc value of 688 mV after full-area metallization of the PEDOT:PSS. We achieve this by combining the PEDOT:PSS hole-selective layer at the rear of the crystalline silicon wafer with a well-passivating electron-selective a-Si:H(i/n) layer stack at the front. Our results clearly prove the excellent hole selectivity of PEDOT:PSS on crystalline silicon. © 2017 The Authors. Published by Elsevier Ltd

Empirical comparison of high gradient achievement for different metals in DC and pulsed mode

For the SwissFEL project, an advanced high gradient low emittance gun is under development. Reliable operation with an electric field, preferably above 125 MV/m at a 4 mm gap, in the presence of an UV laser beam, has to be achieved in a diode configuration in order to minimize the emittance dilution due to space charge effects. In the first phase, a DC breakdown test stand was used to test different metals with different preparation methods at voltages up to 100 kV. In addition high gradient stability tests were also carried out over several days in order to prove reliable spark-free operation with a minimum dark current. In the second phase, electrodes with selected materials were installed in the 250 ns FWHM, 500 kV electron gun and tested for high gradient breakdown and for quantum efficiency using an ultra-violet laser.Comment: 25 pages, 13 figures, 5 tables. Follow up from FEL 2008 conference (Geyongju Korea 2008) New Title in JVST A (2010) : Vacuum breakdown limit and quantum efficiency obtained for various technical metals using DC and pulsed voltage source

Pulsed Electric Discharge in Active Metallic Grains for Water Purification Processes

Chemical reactions in electric metal pulse dispersion in the aqueous solutions of inorganic substance (НSiO[3]{–}, Ni{2+}, Н[2]AsO[4]{–}, Mn{2+}, Cr[2]O[7]{2–}) were determined through IR spectroscopy, X-ray phase, chemical, kinetic, and thermodynamic analyses. Under such conditions, both reduction and oxidation reactions occur, as well as, locally initiated by heating, hydrolysis and exchange reactions without changing the oxidation rate of the dissolved substance itself. Reduction and oxidation of dissolved substances is determined by the generation and activation of high dispersed Fe in an electric discharge. Physical and chemical processes which take place under the action of pulse electric discharges upon the layer of metallic grains in salt solution, containing НSiO[3]{–}, Ni{2+}, Н[2]AsO[4]{–}, Mn{2+}, Cr[2]O[7]{2–} ions were determined on the basis of product composition, obtained experimentally and the thermodynamic data. It was shown, that PED discharge in heterogeneous mediums can be used for waste and natural water purification

The silane depletion fraction as an indicator for the amorphous/crystalline silicon interface passivation quality

In silicon heterojunction solar cells, thin amorphous silicon layers passivate the crystalline silicon wafer surfaces. By using in situ diagnostics during plasma-enhanced chemical vapor deposition (PECVD), the authors report how the passivation quality of such layers directly relate to the plasma conditions. Good interface passivation is obtained from highly depleted silane plasmas. Based upon this finding, layers deposited in a large-area very high frequency (40.68 MHz) PECVD reactor were optimized for heterojunction solar cells, yielding aperture efficiencies up to 20.3% on 4 cm

Clinical Application of Low-dose Calcium Regulating Neural Inhibitor in Related Renal Transplantation

摘要 目的探讨低剂量钙调节神经素抑制剂在亲属活体肾脏移植中的安全性与效果。 方法回顾性总结厦门大学附属东南医院亲属活体肾脏移植患者122例：其中除4例为夫妻间供肾移植外其余均为血缘亲属关系供肾。人类白细胞抗原（HLA）全配7例，1个抗原错配20例，2个抗原错配23例，3个抗原错配72例。血型相同者91例，相容者31例。122例供者均经开放式手术取肾，供者取左肾105例，取右肾17例。术后均采用环孢素A(CsA)或他克莫司(TAC)、霉酚酸酯(MMF)及皮质激素(Pred)经典三联免疫抑制剂方案治疗，其中环孢素A方案71例，他克莫司方案51例。根据术后免疫抑制方案中钙调节免疫抑制剂（CNIs...Abstract Aim: Discusses the safety and effection of low-dose calcineurin inhibitors (CNIs) used in living relative donor kidney transplantation. Methods: One hundred and twenty-two patients with living relative donor kidney transplantation in Southeast Hospital Affiliated to Xiamen University were enrolled in this retrospective study. Expect for 4 patients donated by their spouses, the others h...学位：医学硕士院系专业：医学院临床医学系_外科学学号：2452009115299