Vacua Analysis in Extended Supersymmetry Compactifications

We analyse geometric type IIA flux compactifications leading to N=4 gauged supergravities in four dimensions. The complete landscape of isotropic vacua is presented, which turns out to belong to a unique theory. The solutions admit an uplift to maximal supergravity due to the vanishing of the flux-induced tadpoles for all the supersymmetry-breaking branes. Such an uplift is sketched out and the full N=8 mass spectra are discussed. We find the interesting presence of a non-supersymmetric and nevertheless stable minimum.Comment: 7 pages, contribution to the proceedings of the XVII European Workshop on String Theory, Padua 201

The best of both worlds? An exploratory study of human resource management practices in U.S.-based Japanese affiliates

Japanese management practices have received considerable attention and notoriety over the past fifteen years as Westerners have searched for an understanding of Japan's meteoric economic success. As Japan's foreign direct investments have skyrocketed in the last few years attention has shifted from what the Japanese are doing at home to what they are doing overseas. In spite of this, however, relatively little empirical research has actually been conducted on the management of foreign affiliates of Japanese firms. This chapter reports the results of an exploratory study examining the characteristics of human resource management practices and policies in 49 Japanese manufacturing and service affiliates located in the United States. It describes the policies and practices of personnel selection, compensation, appraisal, and development in terms of three archetypal strategies for managing human resources. This chapter also examines the extent to which policies and practices conform to predications for the three HRM strategy types, as well as the degree of consistency found between stated organizational policies and actual practice

The Josephson critical current in a long mesoscopic S-N-S junction

We carry out an extensive experimental and theoretical study of the Josephson effect in S-N-S junctions made of a diffusive normal metal (N) embedded between two superconducting electrodes (S). Our experiments are performed on Nb-Cu-Nb junctions with highly-transparent interfaces. We give the predictions of the quasiclassical theory in various regimes on a precise and quantitative level. We describe the crossover between the short and the long junction regimes and provide the temperature dependence of the critical current using dimensionless units $eR_{N}I_{c}/\epsilon_{c}$ and $k_{B}T/\epsilon_{c}$ where $\epsilon_{c}$ is the Thouless energy. Experimental and theoretical results are in excellent quantitative agreement.Comment: 5 pages, 4 figures, slighly modified version, publishe

The transfer of human resource management systems overseas: An exploratory study of Japanese and American maquiladoras

The field of international management has, until recently, largely ignored how human resources management (HRM) systems in overseas subsidiaries are designed and how design impacts performance. In addition, there is virtually no research comparing the HRM systems in Japanese and Western affiliates. In an attempt to begin to address this important issue, this chapter presents the results of a study of Japanese and American maquiladoras (in-bond assembly plants) in Mexico. This chapter examines the relative influence of parent company strategy, strategic role of the affiliate, parent company administrative heritage, and host country environment on the HRM systems in eight maquiladoras, four Japanese and four American, located in Tijuana, Mexico. Using a contingency framework, this chapter also describes the fits between each maquiladora's HRM system and its internal and external environments. Finally, it identifies the resulting impact of these fits on performance, both at the individual employee and affiliate levels

Self-aligned charge read-out for InAs nanowire quantum dots

A highly sensitive charge detector is realized for a quantum dot in an InAs nanowire. We have developed a self-aligned etching process to fabricate in a single step a quantum point contact in a two-dimensional electron gas and a quantum dot in an InAs nanowire. The quantum dot is strongly coupled to the underlying point contact which is used as a charge detector. The addition of one electron to the quantum dot leads to a change of the conductance of the charge detector by typically 20%. The charge sensitivity of the detector is used to measure Coulomb diamonds as well as charging events outside the dot. Charge stability diagrams measured by transport through the quantum dot and charge detection merge perfectly.Comment: 11 pages, 3 figure