Thermal control panel Patent

Development and characteristics of thermal sensitive panel for controlling ratio of solar absorptivity to surface emissivity for space vehicle temperature contro

Variable-transparency wall regulates temperatures of structures

An effective temperature regulating wall consists of one layer /e.g., one of the paraffins/ relatively opaque to thermal radiation in the solid state and transparent to it in the molten state and placed between two transparent layers. A mirror coating is applied to back layer

Thermal control wall panel Patent

Thermal control wall panel with application to spacecraft cabin

Self supporting space vehicle Patent

Development and characteristics of self supporting space vehicl

High-performance control of dual-inertia servo-drive systems using low-cost integrated SAW torque transducers

Abstract—This paper provides a systematic comparative study of compensation schemes for the coordinated motion control of two-inertia mechanical systems. Specifically, classical proportional–integral (PI), proportional–integral–derivative (PID), and resonance ratio control (RRC) are considered, with an enhanced structure based on RRC, termed RRC+, being proposed. Motor-side and load-side dynamics for each control structure are identified, with the “integral of time multiplied by absolute error” performance index being employed as a benchmark metric. PID and RRC control schemes are shown to be identical from a closed-loop perspective, albeit employing different feedback sensing mechanisms. A qualitative study of the practical effects of employing each methodology shows that RRC-type structures provide preferred solutions if low-cost high-performance torque transducers can be employed, for instance, those based on surface acoustic wave tecnologies. Moreover, the extra degree of freedom afforded by both PID and RRC, as compared with the basic PI, is shown to be sufficient to simultaneously induce optimal closed-loop performance and independent selection of virtual inertia ratio. Furthermore, the proposed RRC+ scheme is subsequently shown to additionally facilitate independent assignment of closed-loop bandwidth. Summary attributes of the investigation are validated by both simulation studies and by realization of the methodologies for control of a custom-designed two-inertia system

Implementing spatial segregation measures in R.

Reliable and accurate estimation of residential segregation between population groups is important for understanding the extent of social cohesion and integration in our society. Although there have been considerable methodological advances in the measurement of segregation over the last several decades, the recently developed measures have not been widely used in the literature, in part due to their complex calculation. To address this problem, we have implemented several newly proposed segregation indices in R, an open source software environment for statistical computing and graphics, as a package called seg. Although there are already a few standalone applications and add-on packages that provide access to similar methods, our implementation has a number of advantages over the existing tools. First, our implementation is flexible in the sense that it provides detailed control over the calculation process with a wide range of input parameters. Most of the parameters have carefully chosen defaults, which perform acceptably in many situations, so less experienced users can also use the implemented functions without too much difficulty. Second, there is no need to export results to other software programs for further analysis. We provide coercion methods that enable the transformation of our output classes into general R classes, so the user can use thousands of standard and modern statistical techniques, which are already available in R, for the post-processing of the results. Third, our implementation does not require commercial software to operate, so it is accessible to a wider group of people

Improving patient outcomes through use of the teach-back method in the Post Anesthesia Care Unit

The setting for this Clinical Nurse Leader (CNL) project was the Post Anesthesia Care Unit (PACU) at a level I trauma center in the Bay Area. The goal was to improve the discharge education performed by the PACU nurses to improve patient safety and decrease the chance of complications or readmissions to this hospital. With no clear instructions for how discharge teaching should be done, the nurses have many differing styles which leaves room for gaps in discharge planning. This influenced the implementation of the teach-back method during discharge planning in order to ensure proper education and increased patient understanding. A literature review revealed that the teach-back method has helped to decrease hospital readmissions and prevents complications patients may experience during home self-care. The Joint Commission, Agency for Healthcare Research and Quality, and the Institute for Healthcare Improvement all state that the teach-back method for discharge planning is best practice. Project data was collected through observation, microsystem assessments and through nurse and patient surveys. Interventions included nurse education at staff meetings, one on one in-service educations and teach-back handouts. The pre-intervention nurse survey (n=26) showed that 80% of the nurses were familiar with the teach-back method while only 36% of nurses used teach-back during discharge planning regularly. The patient survey (n=25) revealed that patients were able to retain 68% of the information presented during discharge education. One on one in-service education on the teach-back method is still being conducted at this time, with high nurse satisfaction. Follow-up surveys will commence when 100% of the staff have completed the in-service. The expected final outcome of this project is the implementation of the teach-back method during discharge planning by all nurses and increased patient understanding of discharge education

Method and apparatus for shock protection Patent

Removable potting compound for instrument shock protectio

Corporate Governance, Performance and Risk-Taking in the U.S. Banking Industry

In this dissertation, we first examine the relationship between performance of the bank holding company and several board characteristics. We use five proxies for bank performance including Tobin’s Q, ROA, loan loss reserve ratio, non-performing asset ratio, and net charge-offs ratio. Board characteristic variables we include are board size, proportion of outsiders, CEO power, CEO tenure and board tenure. We find that a large board enhances bank performance, as proxied by Tobin’s Q and loan quality variables. We find no evidence that board structure or CEO power influences firm performance. We see that CEO and board tenure have a positive effect on firm performance. We further employ a crisis dummy during the period 2007 through 2009 to determine if the relationships between firm performance and board characteristics changed during the crisis. Our crisis results show us that board size has a negative effect on Tobin’s Q and the non-performing asset ratio during the crisis. Further, we find that board structure decreases the non-performing asset ratio during the crisis. We next examine the relationship between risk-taking of the bank holding company and several board characteristics. We use four accounting based proxies for bank risk-taking including credit risk, liquidity risk, capital ratio and operational risk. We also use three market based proxies for bank risk including market beta, idiosyncratic risk and the standard deviation of its stock return. Board characteristic variables we include are board size, board independence, CEO duality, CEO tenure and board tenure. We find that a large board reduces both balance sheet and market risk. We further investigate the relationships between risk-taking and board characteristics changed during the financial crisis of 2007-2009. We find that our results are robust during the crisis

Corporate Governance, Performance and Risk-Taking in the U.S. Banking Industry

In this dissertation, we first examine the relationship between performance of the bank holding company and several board characteristics. We use five proxies for bank performance including Tobin’s Q, ROA, loan loss reserve ratio, non-performing asset ratio, and net charge-offs ratio. Board characteristic variables we include are board size, proportion of outsiders, CEO power, CEO tenure and board tenure. We find that a large board enhances bank performance, as proxied by Tobin’s Q and loan quality variables. We find no evidence that board structure or CEO power influences firm performance. We see that CEO and board tenure have a positive effect on firm performance. We further employ a crisis dummy during the period 2007 through 2009 to determine if the relationships between firm performance and board characteristics changed during the crisis. Our crisis results show us that board size has a negative effect on Tobin’s Q and the non-performing asset ratio during the crisis. Further, we find that board structure decreases the non-performing asset ratio during the crisis. We next examine the relationship between risk-taking of the bank holding company and several board characteristics. We use four accounting based proxies for bank risk-taking including credit risk, liquidity risk, capital ratio and operational risk. We also use three market based proxies for bank risk including market beta, idiosyncratic risk and the standard deviation of its stock return. Board characteristic variables we include are board size, board independence, CEO duality, CEO tenure and board tenure. We find that a large board reduces both balance sheet and market risk. We further investigate the relationships between risk-taking and board characteristics changed during the financial crisis of 2007-2009. We find that our results are robust during the crisis