Rotor design optimization using a free wake analysis

The aim of this effort was to develop a comprehensive performance optimization capability for tiltrotor and helicopter blades. The analysis incorporates the validated EHPIC (Evaluation of Hover Performance using Influence Coefficients) model of helicopter rotor aerodynamics within a general linear/quadratic programming algorithm that allows optimization using a variety of objective functions involving the performance. The resulting computer code, EHPIC/HERO (HElicopter Rotor Optimization), improves upon several features of the previous EHPIC performance model and allows optimization utilizing a wide spectrum of design variables, including twist, chord, anhedral, and sweep. The new analysis supports optimization of a variety of objective functions, including weighted measures of rotor thrust, power, and propulsive efficiency. The fundamental strength of the approach is that an efficient search for improved versions of the baseline design can be carried out while retaining the demonstrated accuracy inherent in the EHPIC free wake/vortex lattice performance analysis. Sample problems are described that demonstrate the success of this approach for several representative rotor configurations in hover and axial flight. Features that were introduced to convert earlier demonstration versions of this analysis into a generally applicable tool for researchers and designers is also discussed

Aerospace medicine and biology: A continuing bibliography with indexes

This bibliography lists 161 reports, articles, and other documents introduced into the NASA scientific and technical information system in November, 1987

Automotive technology status and projections. Volume 2: Assessment report

Current and advanced conventional engines, advanced alternative engines, advanced power train components, and other energy conserving automobile modifications which could be implemented by the end of this century are examined. Topics covered include gas turbine engines, Stirling engines, advanced automatic transmissions, alternative fuels, and metal and ceramic technology. Critical problems are examined and areas for future research are indicated

Banks, Firms, and Jobs

We analyze the heterogeneous employment effects of financial shocks using a rich data set of job contracts, matched with the universe of firms and their lending banks in one Italian region. To isolate the effect of the financial shock, we construct a firm-specific time-varying measure of credit supply. The preferred estimate indicates that the average elasticity of employment to a credit supply shock is 0.36⁠. Adjustment affects both the extensive and the intensive margins and is concentrated among workers with temporary contracts. We also examine the heterogeneous effects of the credit crunch by education, age, gender and nationality

High school law course and how to vitalize it

This item was digitized by the Internet Archive

Center Director's Discretionary Fund 2005 Annual Report

The FY 2005 CDDF projects were selected from the following spaceport and range technology and science areas: fluid system technologies; spaceport structures and materials; command, control, and monitoring technologies; and biological sciences (including support for environmental stewardship). The FY 2005 CDDF research projects involved development of the following: a) Capacitance-based moisture sensors to optimize plant growth in reduced gravity; b) Commodity-free calibration methods; c) Application of atmospheric plasma glow discharge to alter the surface properties of polymers for improved electrostatic dissipation characteristics; d) A wipe-on, wipe-off chemical process to remove lead oxides found in paint; e) A robust metabolite profiling platform for better understanding the "law" of biological regulation; f) An explanation of the excavation processes that occur when a jet of gas impinges on a bed of sand; g) "Smart coatings" to detect and control corrosion at an early stage to prevent further corrosion h) A model that can produce a reliable diagnosis of the quality of a software product; i) The formulation of advanced materials to meet system safety needs to minimize electrostatic charges, flammability, and radiation exposure; j) A lab-based instrument that uses the electro-optic Pockels effect to make static electric fields visible; k) A passive volatile organic compound (VOC) cartridge to filter, identify, and quantify VOCs flowing into or emanating from plant flight experiments

Annual reports of the town of Greenland, New Hampshire for the fiscal year ending December 31, 2009, as compiled by the town officers.

This is an annual report containing vital statistics for a town/city in the state of New Hampshire

1988 August

MSU Clip Sheet newsletters published in August of 1988

Transmitter and Receiver Architectures for Molecular Communications: A Survey on Physical Design with Modulation, Coding, and Detection Techniques

Inspired by nature, molecular communications (MC), i.e., the use of molecules to encode, transmit, and receive information, stands as the most promising communication paradigm to realize the nanonetworks. Even though there has been extensive theoretical research toward nanoscale MC, there are no examples of implemented nanoscale MC networks. The main reason for this lies in the peculiarities of nanoscale physics, challenges in nanoscale fabrication, and highly stochastic nature of the biochemical domain of envisioned nanonetwork applications. This mandates developing novel device architectures and communication methods compatible with MC constraints. To that end, various transmitter and receiver designs for MC have been proposed in the literature together with numerable modulation, coding, and detection techniques. However, these works fall into domains of a very wide spectrum of disciplines, including, but not limited to, information and communication theory, quantum physics, materials science, nanofabrication, physiology, and synthetic biology. Therefore, we believe it is imperative for the progress of the field that an organized exposition of cumulative knowledge on the subject matter can be compiled. Thus, to fill this gap, in this comprehensive survey, we review the existing literature on transmitter and receiver architectures toward realizing MC among nanomaterial-based nanomachines and/or biological entities and provide a complete overview of modulation, coding, and detection techniques employed for MC. Moreover, we identify the most significant shortcomings and challenges in all these research areas and propose potential solutions to overcome some of them.This work was supported in part by the European Research Council (ERC) Projects MINERVA under Grant ERC-2013-CoG #616922 and MINERGRACE under Grant ERC-2017-PoC #780645

A study of the relationship of selected federal court cases to student control policies found in Virginia school board policy manuals

The purpose of this study was to investigate the relationship between the written student control policies established by Virginia school boards and the principles of law found in recent federal court decisions related to student conduct. The researcher also examined the number of student control policies in relation to school division size and location. A further purpose was to relate such policies to school laws contained in the Code of Virginia.;The population for the study consisted of all the school divisions in Virginia, one hundred thirty-seven (137) at the time of this study. of this number, one hundred thirty-one (131) divisions had usable policy manuals since some divisions were combined under one school board. These manuals were made available to the researcher through the Virginia State Department of Education.;All the policy manuals were examined by the researcher through a method known as content analysis. Essentially, hypotheses are formulated; a sample of content is selected; categories are defined; documents are read and coded, using the categories as a guide; content data are tabulated; data are scaled or otherwise statistically treated; and interpretations are made in light of the hypotheses posed.;It was hypothesized that (1) the content of Virginia school board policy manuals matched the categories of student control policies chosen for the study; (2) the content of the manuals agreed with the principles of law found in selected student control federal court decisions, 1965 to 1979; (3) the number of written student control policies varied with school division size and location; and (4) the content of the manuals reflected student control statutes in the Code of Virginia.;It was concluded that most board manuals did not contain all categories of student control policies. The categories which appeared more frequently were health and safety standards, weapons and drugs, and student records. Nor were the board student control policies in agreement with recent court decisions except in areas such as suspension and expulsion, drugs, due process procedures, and corporal punishment. Policy manuals did vary in content according to the size and location of the school division. It was also determined that Virginia statutes for student control did not agree with the content of the manuals except in areas such as civil rights, health and safety standards, administrative standards, and weapons and drugs