A 500-Electrical-Watt Solar Energy Thermionic Conversion System for a Mars Spacecraft

500-electrical-watt solar energy thermionic conversion system for a mars spacecraf

Impaired Dendritic Expression and Plasticity Of H-Channels in the fmr1(-/Y) Mouse Model of Fragile X Syndrome

Despite extensive research into both synaptic and morphological changes, surprisingly little is known about dendritic function in fragile X syndrome (FXS). We found that the dendritic input resistance of CA1 neurons was significantly lower in fmr1(-/y) versus wild-type mice. Consistent with elevated dendritic I-h, voltage sag, rebound, and resonance frequency were significantly higher and temporal summation was lower in the dendrites of fmr1(-/y) mice. Dendritic expression of the h-channel subunit HCN1, but not HCN2, was higher in the CA1 region of fmr1(-/y) mice. Interestingly, whereas mGluR-mediated persistent decreases in Ih occurred in both wildtype and fmr1(-/y) mice, persistent increases in Ih that occurred after LTP induction in wild-type mice were absent in fmr1(-/y) mice. Thus, chronic upregulation of dendritic Ih in conjunction with impairment of homeostatic h-channel plasticity represents a dendritic channelopathy in this model of mental retardation and may provide a mechanism for the cognitive impairment associated with FXS.FRAXAUniversity of Texas Austin Undergraduate Research FellowshipNational Institutes of Health Grant MH048432Center for Learning and Memor

Study of shell supported ring frames with out- of-plane loading Final report, 24 Jun. - 28 Dec. 1965

Deflections and internal loading distribution of circular cylindrical shell supported ring frames with out-of-plane loading

Row Sport Context in PISA Like Mathematics Problem

The aim of research was to produce valid, practical and had potential-effect to mathematic literacy ability in PISA like mathematics problem in using row sports context at Asian Games 2018. The research method used development research with development studies type. The subjects of the research were the students with 15 years old of class X SMAN 10 Palembang. The techniques of collecting data were used documentation, walkthrough, test, and interview. This research produced the problem about how the students determined how many benches could be made by only knowing length and width of the boats. The results showed that the problem developed (1) valid from the suitability with the framework PISA regarding content, context, literacy process and level of questions that was connected problems with daily life accordance experts review and one to one stage (2) practical because the problem could be understood by students accordance small group stage, and (3) had a potential effect from the result of analyze the student's answer in mathematical literacy ability with representation and reasoning ability as dominant accordance field test stage

Evaluation of superplastic forming and co-diffusion bonding of Ti-6Al-4V titanium alloy expanded sandwich structures

The application of the superplastic forming/diffusion bonding (SPF/DB) process to supersonic cruise research is investigated. The capability of an SPF/DB titanium structure to meet the structural requirements of the inner wing area of the NASA arrow-wing advanced supersonic transport design is evaluated. Selection of structural concepts and their optimization for minimum weight, SPF/DB process optimization, fabrication of representative specimens, and specimen testing and evaluation are described. The structural area used includes both upper and lower wing panels, where the upper wing panel is used for static compression strength evaluation and the lower panel, in tension, is used for fracture mechanics evaluations. The individual test specimens, cut from six large panels, consist of 39 static specimens, 10 fracture mechanics specimens, and one each full size panel for compression stability and fracture mechanics testing. Tests are performed at temperatures of -54 C (-65 F), room temperature, and 260 C (500 F)

PH14-8Mo stainless steel honey comb core shear strength at elevated temperatures, 1 July 1968 - 1 July 1969

PH-8Mo stainless steel honeycomb sandwich cor

Fractal capacitors

A linear capacitor structure using fractal geometries is described. This capacitor exploits both lateral and vertical electric fields to increase the capacitance per unit area. Compared to standard parallel-plate capacitors, the parasitic bottom-plate capacitance is reduced. Unlike conventional metal-to-metal capacitors, the capacitance density increases with technology scaling. A classic fractal structure is implemented with 0.6-μm metal spacing, and a factor of 2.3 increase in the capacitance per unit area is observed. It is shown that capacitance boost factors in excess of ten may be possible as technology continues to scale. A computer-aided-design tool to automatically generate and analyze custom fractal layouts has been developed

Profitability And Capital Structure Of Amex And Nyse Firms

In this study, we found that NYSE and AMEX firms have somewhat different capital structures.  NYSE firms generally use 5% to 8% more debt financing in their capital structures than AMEX firms.  It was also found that the amount of debt in the capital structures of AMEX firms declined somewhat between 1985 and 2003 but remained relatively stable for NYSE firms.  Also, NYSE firms were found to exhibit a strong inverse relationship between firm profitability and the amount on debt in the firm’s capital structure.  This result is generally consistent with Myers and Majluf’s “asymmetric information theory” of capital structure.  No relationship was found between profitability and capital structure for AMEX firms.  Comparison of these results to similar calculations found in Fosberg and Ghosh (2005) for NASDAQ firms shows that, like AMEX firms, NASDAQ firms use less debt in their capital structures than NYSE firms and exhibit no relationship between profitability and capital structure.  Consequently, because these anomalies exist for both AMEX and NASDAQ firms, these two anomalies can not be an exchange listing effect

Effects of constrained trunk movement on frontal plane gait kinematics

Previously it has been shown that constraining step width in gait coincides with decreased trunk displacements. Conversely, external stabilization of the upper body in gait coincides with decreased step width, but this may in part be due to changes in passive dynamics of the leg. In the present study, trunk kinematics during gait were constrained without external stabilization by using an orthosis, to investigate whether step width and dynamic gait stability in the ML direction are changed in relation to trunk kinematics. Nine healthy young adults walked on a treadmill at three different speeds with no intervention and while wearing a thoracolumbar orthosis. Based on marker trajectories, trunk COM displacement, body COM displacement and velocity, step width, and margin-of-stability in ML direction were calculated. The results showed that the orthosis significantly reduced trunk and body COM displacements. As hypothesized, the restriction of trunk movement coincided with significantly decreased step width, while the margin-of-stability was not affected. These findings indicate that, when trunk movements are constrained, humans narrow step width, while maintaining a constant margin-of-stability. In conclusion, the present results in combination with previous work imply that in gait a reciprocal coupling between trunk kinematics and foot placement in the frontal plane subserves control of stability in the frontal plane

Cross-Well Radar II: Comparison and Experimental Validation of Modeling Channel Transfer Function

Close agreement between theory and experiment is critical for adequate understanding and implementation of the Cross-Well Radar (CWR, otherwise known as Cross-Borehole Ground Penetrating Radar) technique, mentioned in a previous paper by the authors. Comparison of experimental results to simulation using a half-space dyadic Green’s function in the frequency domain requires development of transfer functions to transform the experimental data into a compatible form. A Channel Transfer Function (CTF) was developed to avoid having to model the transmitting and receiving characteristics of the antennas. The CTF considers electromagnetic (EM) wave propagation through the intervening media only (soil in this case), and hence corresponds to the simulation results that assume ideal sources and receivers. The CTF is based on assuming the transmitting antenna, soil, and receiving antenna as a cascade of three two-port microwave junctions between the input and output ports of the Vector Network Analyzer (VNA) used in the experimental measurements. Experimentally determined CTF results are then compared with computational model simulations for cases of relatively dry and saturated sandy soil backgrounds. The results demonstrate a reasonable agreement, supporting both the model and CTF formulation