Dynamic Magnetography of Solar Flaring Loops

We develop a practical forward fitting method based on the SIMPLEX algorithm with shaking, which allows the derivation of the magnetic field and other parameters along a solar flaring loop using microwave imaging spectroscopy of gyrosynchrotron emission. We illustrate the method using a model loop with spatially varying magnetic field, filled with uniform ambient density and an evenly distributed fast electron population with an isotropic, power-law energy distribution.Comment: ApJ Letters, in pres

Miniature modular microwave end-to-end receiver

An end-to-end microwave receiver system contained in a single miniature hybrid package mounted on a single heatsink is presented. It includes an input end connected to a microwave receiver antenna and an output end which produces a digital count proportional to the amplitude of a signal of a selected microwave frequency band received at the antenna and corresponding to one of the water vapor absorption lines near frequencies of 20 GHz or 30 GHz. The hybrid package is on the order of several centimeters in length and a few centimeters in height and width. The package includes an L-shaped carrier having a base surface, a vertical wall extending up from the base surface and forming a corner therewith, and connection pins extending through the vertical wall. Modular blocks rest on the base surface against the vertical wall and support microwave monolithic integrated circuits on top surfaces thereof connected to the external connection pins. The modular blocks lie end-to-end on the base surface so as to be modularly removable by sliding along the base surface beneath the external connection pins away from the vertical wall

Gary Grossman Oral History Interview

https://scholarlycommons.pacific.edu/raymond-college/1072/thumbnail.jp

\u3cem\u3eRhizobium japonicum\u3c/em\u3e Mutants Defective in Symbiotic Nitrogen Fixation

Rhizobium japonicum strains 3I1b110 and 61A76 were mutagenized to obtain 25 independently derived mutants that produced soybean nodules defective in nitrogen fixation, as assayed by acetylene reduction. The proteins of both the bacterial and the plant portions of the nodules were analyzed by two-dimensional polyacrylamide gel electrophoresis. All of the mutants had lower-than-normal levels of the nitrogenase components, and all but four contained a prominent bacteroid protein not observed in wild-type bacteroids. Experiments with bacteria grown ex planta suggested that this protein was derepressed by the absence of ammonia. Nitrogenase component II of one mutant was altered in isoelectric point. The soluble plant fraction of the nodules of seven mutants had very low levels of heme, yet the nodules of five of these seven mutants contained the polypeptide of leghemoglobin. Thus, the synthesis of the globin may not be coupled to the content of available heme in soybean nodules. The nodules of the other two of these seven mutants lacked not only leghemoglobin but most of the other normal plant and bacteroid proteins. Ultrastructural examination of nodules formed by these two mutants indicated normal ramification of infection threads but suggested a problem in subsequent survival of the bacteria and their release from the infection threads

Developments in impact damage modeling for laminated composite structures

Damage tolerance is the most critical technical issue for composite fuselage structures studied in the Advanced Technology Composite Aircraft Structures (ATCAS) program. The objective here is to understand both the impact damage resistance and residual strength of the laminated composite fuselage structure. An understanding of the different damage mechanisms which occur during an impact event will support the selection of materials and structural configurations used in different fuselage quadrants and guide the development of analysis tools for predicting the residual strength of impacted laminates. Prediction of the damage state along with the knowledge of post-impact response to applied loads will allow for engineered stacking sequencies and structural configurations; intelligent decisions on repair requirements will also result

Automation Laboratory Development With Design Implementation Scheme and Simulation Software

This paper describes the development of the Automation Control Lab in the Mechanical Engineering Technology Program of the Engineering Technology Department at Old Dominion University. The reorganization goal of the development is to help students design, test, and implement their automation designs effectively. Three processes are adopted to achieve this goal: (1) floor-plan design and inventory control of the components, (2) using Automation Studio to dynamically check each design, and (3) using industrial Programmable Logic Controllers (PLC) controllers to download PLC programs

Accounting Enforcement’s Determinants—A Global Study

The purpose of this study is to investigate whether the national characteristics of culture, religion and political factionalization are associated with the strength of accounting enforcement. The study uses data on percentages of religious adherents in a sample nation, the Hofstede cultural dimensions and political factionalization as key independent variables. This study also controls for national legal code (e.g., Common Law or Civic Code) and market liquidity. It uses factor analysis to generate factor scores from the data. These factor scores are then used as the independent variables. The dependent variable, accounting enforcement, is drawn from Brown, Preiato and Tarca (2014). The findings demonstrate that these national characteristics are strongly associated with national accounting regulatory enforcement. The implications of this research are that national characteristics should be taken into account in considering the impact of accounting standards on accounting comparability across nations. The limitation of this study is that, like much international research, the sample size is limited, here to 42 nations. This study provides an important contribution to the literature by helping establish that national characteristics do affect accounting enforcement efforts cross-nationally. This helps researchers and regulators better understand whether international standards can provide the link in comparability across nations that proponents are seeking. It does so by focusing on the variation in enforcement across nations rather than on the standards themselves

Category-Based and Association-Based Map Displays by Human Subjects

Visual displays are important for information retrieval. A good visual display should not only help the viewer to see and sense the information, but also abstract and present the semantic structure of the underlying information to facilitate searching and browsing. Depending on the type of structures shown on the display, visual displays for information retrieval can be classified as hierarchical displays, network displays, scatter displays, and map displays (LiD, 1993)