Dynamic Trust Federation in Grids

Grids are becoming economically viable and productive tools. Grids provide a way of utilizing a vast array of linked resources such as computing systems, databases and services online within Virtual Organizations (VO). However, today’s Grid architectures are not capable of supporting dynamic, agile federation across multiple administrative domains and the main barrier, which hinders dynamic federation over short time scales is security. Federating security and trust is one of the most significant architectural issues in Grids. Existing relevant standards and specifications can be used to federate security services, but do not directly address the dynamic extension of business trust relationships into the digital domain. In this paper we describe an experiment in which we highlight those challenging architectural issues and we will further describe how the approach that combines dynamic trust federation and dynamic authorization mechanism can address dynamic security trust federation in Grids. The experiment made with the prototype described in this paper is used in the NextGRID project for the definition of requirements for next generation Grid architectures adapted to business application need

Detection Rates for Kaluza-Klein Dark Matter

We consider the lightest Kaluza-Klein particle at N=1 mode (LKP) of universal extra dimension to be the candidate for Dark Matter and predict the detection rates for such particles for Germenium and NaI detectors. We have also calculated the nature of annual modulation for the signals in these two types of detectors for LKP Dark Matter. The rates with different values of speed of solar system in the Galactic rest frame are also evaluated.Comment: Submitted to Phys. Rev.

A new liver perfusion and preservation system for transplantation Research in large animals

A kidney perfusion machine, model MOX-100 (Waters Instruments, Ltd, Rochester, MN) was modified to allow continuous perfusion of the portal vein and pulsatile perfusion of the hepatic artery of the liver. Additional apparatus consists of a cooling system, a membrane oxygenator, a filter for foreign bodies, and bubble traps. This system not only allows hypothermic perfusion preservation of the liver graft, but furthermore enables investigation of ex vivo simulation of various circulatory circumstances in which physiological perfusion of the liver is studied. We have used this system to evaluate the viability of liver allografts preserved by cold storage. The liver was placed on the perfusion system and perfused with blood with a hematocrit of approximately 20% and maintained at 37°C for 3 h. The flows of the hepatic artery and portal vein were adjusted to 0.33 mL and 0.67 mL/g of liver tissue, respectively. Parameters of viability consisted of hourly bile output, oxygen consumption, liver enzymes, electrolytes, vascular resistance, and liver histology. This method of liver assessment in large animals will allow the objective evaluation of organ viability for transplantation and thereby improve the outcome of organ transplantation. Furthermore, this pump enables investigation into the pathophysiology of liver ischemia and preservation. © 1990 Informa UK Ltd All rights reserved: reproduction in whole or part not permitted

Stochastic Heterostructures in B/N-Doped Carbon Nanotubes

Carbon nanotubes are one-dimensional and very narrow. These obvious facts imply that under doping with boron and nitrogen, microscopic doping inhomogeneity is much more important than for bulk semiconductors. We consider the possibility of exploiting such fluctuations to create interesting devices. Using self-consistent tight-binding (SCTB), we study heavily doped highly compensated nanotubes, revealing the spontaneous formation of structures resembling chains of random quantum dots, or nano-scale diode-like elements in series. We also consider truly isolated impurities, revealing simple scaling properties of bound state sizes and energies.Comment: 4 pages RevTeX, 4 PostScript figure

One slope or two? Detecting statistically significant breaks of slope in geophysical data, with application to fracture scaling relationships

The scaling of displacement as a function of length is important for a variety of applications which depend on the mechanical and hydraulic properties of faults and fractures. Recently it has been suggested that the power-law exponent nu which has been found to characterise this relationship may change significantly at a characteristic length for a variety of reasons, for example when cracks begin to interact, or when faults grow to a length comparable to a characteristic size in the brittle layer. Such a break of slope requires a second straight line, requiring two extra model parameters. Here we present a new method for analysing such data, which penalises the extra parameters using a modified form of Schwarz's Information Criterion, and a Bayesian approach which represents uncertainty in the unknown parameters. We apply the method to data from the Krafla fissure zone in the north of Iceland, and find a significant break of slope, from nu approximate to 3/2 to nu approximate to 2/3, at a characteristic length of 12 m

Measurement of shower development and its Moli\`ere radius with a four-plane LumiCal test set-up

A prototype of a luminometer, designed for a future e+e- collider detector, and consisting at present of a four-plane module, was tested in the CERN PS accelerator T9 beam. The objective of this beam test was to demonstrate a multi-plane tungsten/silicon operation, to study the development of the electromagnetic shower and to compare it with MC simulations. The Moli\`ere radius has been determined to be 24.0 +/- 0.6 (stat.) +/- 1.5 (syst.) mm using a parametrization of the shower shape. Very good agreement was found between data and a detailed Geant4 simulation.Comment: Paper published in Eur. Phys. J., includes 25 figures and 3 Table

Biogas production potential from co-digestion of composted faecal sludge mixed with rice husks and sawdust

The global demand for energy is increasing, with 80% of total energy obtained from fossil fuels rich in greenhouse gases. Biogas is an effective alternative to fossil fuels. Thus, this study aimed at evaluating biogas production potential from co-digestion of com posted faecal sludge (FS) mixed with rice husks (RH) and sawdust (SD). FS of 2000g, 3000g was mixed with RH and SD (2mm, 4mm). The ratios for RH and SD were 1: 0, 0: 1, 1: 1, 3: 1, 1: 3; each mixed with FS, composted for 20days followed by biogas production. Quantity and quality of biogas were measured using water and NaOH displacements, respectively. CH4 con tent ranged between 74-76%. Digester with 2000g FS and 100g RH (4mm) performed excel lently, producing 17.2 L of biogas. Conclusively, RH, SD and FS have potential to produce biogas. However, a comparative study should be done on fresh and composted materials to assess the influence of composting on biogas production

PERATAAN TENAGA KERJA DENGAN MENGGUNAKAN MICROSOFT PROJECT PADA PROYEK REHABILITASI PUSKESMAS MINANGA

Tenaga Kerja merupakan salah satu unsur penting dalam pelaksanaan suatu proyek karena pengaruhnya cukup besar terhadap biaya dan waktu penyelesaian suatu pekerjaan proyek. Akan tetapi, seringkali kita temui pemborosan tenaga kerja dalam hal ini tidak meratanya tenaga kerja dalam setiap item–item pekerjaan. Oleh karena itu dibutuhkannya suatu usaha untuk meminimumkan fluktuasi yang terjadi yaitu dengan melakukan perataan jam kerja pada pekerja sehingga dalam pengalokasiannya diperoleh solusi tenaga kerja yang lebih efektif dan efisien.Microsoft Project 2016 merupakan software yang digunakan untuk membantu manejer proyek dalam mengembangkan rencana, menetapkan sumber daya untuk tugas–tugas, pelacakan kemajuan, mengolah anggaran, dan menganalisis beban kerja.Data awal yang harus dimasukkan adalah data proyek, data aktivitas proyek, durasi, hubungan antar pekerjaan,dan kebutuhan pekerja. Dari Microsoft Project 2016 didapat hasil penggunaan tenaga kerja terbesar pada minggu terakhir bulan november sampai minggu terakhir bulan desember dimana dibutuhkan pekerja sebanyak 100 orang dan diperoleh schedule terbaik pada proyek Rehabilitasi Puskesmas Minanga Kata Kunci: Tenaga Kerja, Microsoft Project 2016, Perataa