974 research outputs found
What are the cultural challenges that Risk Management Professionals face when working in Latin American companies with an implemented risk management framework?
While organizations are concerned about threats and uncertainty in their business objectives and goals; risks also represent rewards and opportunities. Risk attitudes are determined on individual, familiar, social, and corporate beliefs which are inherent, in the nature of the business and organizational culture that influ-ence risk management effectiveness. Risk management varies depending on the region where it is implemented, different variables come on stage as well as local laws and regulations. Companies face several challenges when it comes into aligning local poli-cies versus corporate guidelines. Employees from all levels must participate actively to learn and apply risk methodolo-gies and frameworks. Their success is not determined by either the type implemented nor the interactions among several departments, but by the level of maturity of the re-sources and tools in place. Latin America represents a singular case of analysis as its socio-economic reality in-fluences in the performance of international risk management practices and standards. This region also faces the challenges of making organizations aware of risk manage-ment practices to be less vulnerable and more profitable. Cultural behaviors within a country impact on the performance and acceptance of risk management practices in organizations established in Latin America. In this paper we will also discuss how Latin culture defines the tone of risk management best practices and outcomes within transnational companies which operate under different risk management frameworks
Women's reproductive rights in the inter-American system of human rights: conclusions from the Field, June - September 2014
The Inter-American System of Human Rights has proven to be a forum for the advancement of women’s reproductive rights in the Inter-American region. However, the Inter-American System faces significant challenges in promoting structural transformative change that enables women’s enjoyment of their reproductive health rights. This report examines three reproductive rights cases from the Inter- American Commission on Human Rights and the Inter-American Court of Human Rights: MarÃa Mamerita Mestanza Chávez v. Peru; Paulina Ramirez Jacinto v. Mexico; and Artavia Murillo et al. v. Costa Rica. In the summer of 2014, interviews were conducted with representatives in each of the case study countries, with the objective of the research being two-fold: (1) to understand how each of the cases developed, and the subsequent challenges and advancements; and (2) to learn from these cases in order to suggest recommendations for how actors can make better use of the Inter-American System as one of several avenues for protecting, promoting and fulfilling women’s reproductive rights. The report first discusses challenges in implementing women’s reproductive health rights, and then explores how the Inter-American System can strengthen its work on women’s reproductive health rights
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46 p. Recurso Electr?nic
Developments on a Cold Bead Pull Test Stand for SRF Cavities
Final tuning and field profile characterization of SRF cavities always takes place at room temperature. However, important questions remains as to what happens when the cavity is cooled to LHe temperature, in particular with multi cell systems. To enable the characterization of cavities in the cold, we have designed and commissioned a cold bead pull test stand at HZB. The present test stand is designed to be integrated in HoBiCaT Horizontal bi cavity testing facility [1] with the ability to provide electric field profile measurements under realistic superconducting conditions T 1.8K . In this paper mechanical and operational details of the apparatus will be described as well as future plans for the development and usage of this facilit
Cold Bead Pull Test Stand for SRF Cavities
Bead pull measurements represent a final step in the fabrication process of an SRF cavity. These tests allow to characterise the flatness of the field profile in order to mechanically tune the cavity to achieve design specifications. The realization of a bead pull measurement is always performed at room temperature and therefore it is influenced by the material physical properties resulting into higher surface losses as compared to the superconducting state. Moreover, questions like mechanical deformation due to asymmetrical thermal shrinkage through the cool down process and the stress created by the tuner actuation have not yet been answered experimentally. In this paper, an upgrade of the former Cold Bead pull system developed by HZB [1] is presented. This test stand is capable of holding a 9 cell Tesla cavity at LHe temperature providing a realistic insight to cavity parameters under operation conditions. In addition, a copper test pill box is placed in series with the multi cell cavity in order to perform 1.8K calibration of the bead. Test results of the commissioned test stand prototype are presented on this pape
High Q Cavity Operation Study on the Thermoelectrically Induced Contribution to RF Surface Resistance
We present a study concerning the operation of a superconducting RF cavity non doped niobium in horizontal testing with the focus on understanding the thermoelectrically induced contribution to the surface resistance. Starting in 2009, we suggested a means of reducing the residual resistance by warming up a cavity after initial cooldown to about 20 K and cooling it down again [1]. In subsequent studies we used this technique to manipulate the residual resistance by more than a factor of 2 [2]. We postulated that thermocurrents during cooldown generate additional trapped magnetic flux that impacts the cavity quality factor. Since several questions remained open, we present here a more extensive study including measurement of two additional passband modes of the 9 cell cavity that confirms the effect. We also discuss simulations that substantiate the claim. While the layout of the cavity LHe tank system is cylindrically symmetric, we show that the temperature dependence of the material parameters result in a non symmetric current distribution. Hence a significant amount of magnetic flux can be generated at the RF surface resulting in an increased surface resistance [3
Quasi-Exact Solvability and the direct approach to invariant subspaces
We propose a more direct approach to constructing differential operators that
preserve polynomial subspaces than the one based on considering elements of the
enveloping algebra of sl(2). This approach is used here to construct new
exactly solvable and quasi-exactly solvable quantum Hamiltonians on the line
which are not Lie-algebraic. It is also applied to generate potentials with
multiple algebraic sectors. We discuss two illustrative examples of these two
applications: an interesting generalization of the Lam\'e potential which
posses four algebraic sectors, and a quasi-exactly solvable deformation of the
Morse potential which is not Lie-algebraic.Comment: 17 pages, 3 figure
Determination of antibiotic residues and withdrawal time in milk from the town of Cartago, Valle del Cauca
P?ginas 25-31Recurso Electr?nicoEl control de residuos de antimicrobianos, en productos de origen animal, es de gran importancia, ya que estos pueden ocasionar problemas de salud al consumidor, as? como interferencias en los procesos tecnol?gicos y p?rdidas econ?micas significativas para la industria; por ello, resulta conveniente establecer sistemas adecuados de control de residuos de los antimicrobianos utilizados en el ganado vacuno lechero y as? entregar un producto de excelente calidad para el consumidor. En este estudio, se emplearon seis antimicrobianos (ceftiofur, espiramicina, tilosina, oxitetraciclina, amoxicilina, cloxacilina) que se administraron v?a intramuscular y una asociaci?n (cloxacilina-ampicilina) administrado v?a intramamaria en 115 vacas cruzadas (Holstein-ceb?). Se tomaron muestras de leche a 1, 3 y cada 12 horas postratamiento y se analizaron con la prueba microbiol?gica Delvotest SP-NT. Los resultados indicaron que el 89,3% de los animales no presentaron residuos de ceftiofur, mientras que el 65,2% tuvieron residuos de oxitetraciclina, en rangos de 72 y 156 horas. Residuos de tilosina se obtuvieron entre 108 y 168 horas, con un pico m?ximo a las 108 horas (58,8%), el cual coincide con la detecci?n de residuos de espiramicina (69,2%). Se detectaron residuos de amoxicilina a partir de las 48 y hasta las 84 horas, con una frecuencia del 65% a las 84 horas. Finalmente, los tratamientos intramamarios con la asociaci?n cloxacilina-ampicilina indicaron que la detecci?n de residuos disminuye despu?s de las 60 horas (42,9%).ABSTRACT. Control of antimicrobial residues in animal products is very important, since they may cause consumer?s health problems and interfere with technological processes causing significant economic losses to the food industry. Thus, it is necessary to establish suitable control systems for antimicrobials used in dairy cattle and in this way to deliver a high quality product to the consumers. In this study, we used 6 antimicrobials (ceftiofur, spiramycin, tylosin, oxytetracycline, amoxicillin and cloxacillin-ampicillin association) that were administered via intramuscular route and one antimicrobial (cloxacillin-ampicillin association) administered via intramammary in 115 crossbred cows (Holstein-Zebu), to evaluate antimicrobial residues in milk. Samples of milk were taken, at 1, 3, and every 12 hours post-treatment and analyzed by the microbiological test Delvotest SP-NT). The results indicated that 89,3% of the animals did not present residues of Ceftiofur, whereas 65,2% had residues of Oxytetracycline between 72 and 156 hours post-treatment. Residues of Tylosin were found between 108 to 168 hours, with a peak at 108 hours (58.8%), which coincides with the detection of residues of Spiramycin (69.2%). Residues of amoxicillin were detected at 48 hr and still remained at 84 hours, with a frequency of 65% by this time. Finally, intramammary treatment with Ampicillin- Cloxacillin indicated that the detection of residues decreased after 60 hours (42.9%)
RF Feedback and Detuning Studies for the BESSY Variable Pulse Length Storage Ring Higher Harmonic SC Cavities
For the feasibility of the BESSY VSR upgrade project of BESSY II two higher harmonic systems at a factor of 3 and 3.5 of the ring s RF fundamental of 500 MHz will be installed in the ring. Operating in continuous wave at high average accelerating field of 20 MV m and phased at zerocrossing, the superconducting cavities have to be detuned within tight margins to ensure stable operation and lowpower consumption at a loaded Q of 5 107. The field variation of the cavities is mainly driven by the repetitive transient beam loading of the envisaged complex bunch fill pattern in the ring. Within this work combined LLRF cavity and longitudinal beam dynamics simulation will demonstrate the limits for stable operation, especially the coupling between synchrotron oscillation and RF feedback settings. Further impact by beam current decay and top up injection shots are being simulate
Production of the 1.5 GHz fundamental power couplers for VSR demo
Research Instruments RI and Thales have been pro ducing the first two prototype 1.5 GHz fundamental power couplers for the VSR Variable pulse length Storage Ring DEMO since early 2021 and delivered these prototypes in late March 2023. These couplers are designed to provide up to 16 kW CW power to two 1.5 GHz superconducting cavities of the VSR DEMO module and provide variable coupling with a Qext range from 6 106 to 6 107. The paper describes the challenges in fabricating a scaled coupler and provides details on the modifications to the design as a re sult of these challenges. The impact of the late stage design modification is discussed along with how this affects future conditioning plan
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