Electronic structure of copper intercalated transition metal dichalcogenides: First-principles calculations

We report first principles calculations, within density functional theory, of copper intercalated titanium diselenides, CuxTiSe2, for values of x ranging from 0 to 0.11. The effect of intercalation on the energy bands and densities of states of the host material is studied in order to better understand the cause of the superconductivity that was recently observed in these structures. We find that charge transfer from the copper atoms to the metal dichalcogenide host layers causes a gradual reduction in the number of holes in the otherwise semi-metallic pristine TiSe2, thus suppressing the charge density wave transition at low temperatures, and a corresponding increase in the density of states at the Fermi level. These effects are probably what drive the superconducting transition in the intercalated systems.Comment: 8 pages, 6 figure

Work Satisfaction of Arab Social Services Employees in Southern Israel

The purpose of this study is to describe work satisfaction of Arab social services employees in Southern Israel, to compare it with work satisfaction of Jewish social services employees, and to ascertain if work satisfaction of Arab and Jewish employees is either similar or different. In the State of Israel, the national government which has a historical conflict with the Arab people has to approve all local administrations, policies, taxes, and budgets. In this study two hypotheses are posited. The first hypothesis states that work satisfaction of Arab social services employees who are controlled by administrative structures nominated by the Israeli government differs from work satisfaction of Jewish social services employees. The second hypothesis states that work satisfaction of Arab social services employees who are governed by an elected local administrative structure is somewhat similar to work satisfaction of Jewish social services employees. Forty four employees of Arab and Jewish social services departments filled out questionnaires which included five dimensions concerning work satisfaction. They were divided into three groups: Group A included 15 Arab social services employees of two nominated administrative structures; group B included 15 Arab social services employees of an elected local administrative structure; and group C included 14 Jewish social services employees. I The findings of the study lead to accepting both hypotheses. Work satisfaction among Jewish social services employees was 4.35 on a S-Point Scale, (1= strongly dissatisfied... J= strongly satisfied). Work satisfaction among Arab social services employees who are governed by an elected local administrative structure was 3.95. In comparison, work satisfaction among Arab social services employees who are controlled by nominated administrative structures was 3.65. The findings in this study indicate that administrative structures, whether elected or not, can increase or decrease work satisfaction of employees, and that Arab social services employees are less satisfied than Jewish social services employees under the administrative circumstances explained in this study. Implications and limitations of this study are discussed later in this paper

Component Data Base for Space Station Resistojet Auxiliary Propulsion

The resistojet was baselined for Space Station auxiliary propulsion because of its operational versatility, efficiency, and durability. This report was conceived as a guide to designers and planners of the Space Station auxiliary propulsion system. It is directed to the low thrust resistojet concept, though it should have application to other station concepts or systems such as the Environmental Control and Life Support System (ECLSS), Manufacturing and Technology Laboratory (MTL), and the Waste Fluid Management System (WFMS). The information will likely be quite useful in the same capacity for other non-Space Station systems including satellite, freeflyers, explorers, and maneuvering vehicles. The report is a catalog of the most useful information for the most significant feed system components and is organized for the greatest convenience of the user

How do sovereign wealth funds pay their portfolio companies’ executives? Evidence from Kuwait

Sovereign wealth funds (SWFs) are major players in the global markets. This paper examines the possible value SWFs bring to their domestic holdings by examining the impact of SWF ownership on firms’ executive compensation. Using data on Kuwaiti SWFs, we find that having an SWF as an ultimate owner enhances the pay–performance sensitivity (PPS) to levels matching those in more developed markets. This pay–performance enhancement increases as the rights of the SWF to manage and oversee the firm’s cash-flow increase. Moreover, having an SWF as the firm’s ultimate owner alleviates the adverse effects of the divergence in cash-flow and control rights. This evidence supports the notion that SWFs create value for their target investments through activism, monitoring and corporate governance enhancements

Potential propellant storage and feed systems for space station resistojet propulsion options

The resistojet system has been defined as part of the baseline propulsion system for the initial Operating Capability Space Station. The resistojet propulsion module will perform a reboost function using a wide variety of fluids as propellants. There are many optional propellants and propellant combinations for use in the resistojet including (but not limited to): hydrazine, hydrogen, oxygen, nitrogen, water, carbon dioxide, and methane. Many different types of propulsion systems have flown or have been conceptualized that may have application for use with resistojets. This paper describes and compares representative examples of these systems that may provide a basis for space station resistojet system design

Window-based Streaming Graph Partitioning Algorithm

In the recent years, the scale of graph datasets has increased to such a degree that a single machine is not capable of efficiently processing large graphs. Thereby, efficient graph partitioning is necessary for those large graph applications. Traditional graph partitioning generally loads the whole graph data into the memory before performing partitioning; this is not only a time consuming task but it also creates memory bottlenecks. These issues of memory limitation and enormous time complexity can be resolved using stream-based graph partitioning. A streaming graph partitioning algorithm reads vertices once and assigns that vertex to a partition accordingly. This is also called an one-pass algorithm. This paper proposes an efficient window-based streaming graph partitioning algorithm called WStream. The WStream algorithm is an edge-cut partitioning algorithm, which distributes a vertex among the partitions. Our results suggest that the WStream algorithm is able to partition large graph data efficiently while keeping the load balanced across different partitions, and communication to a minimum. Evaluation results with real workloads also prove the effectiveness of our proposed algorithm, and it achieves a significant reduction in load imbalance and edge-cut with different ranges of dataset