Spawning behavior and larval development in Mopalia lignosa and Mopalia muscosa (Mollusca: Polyplacophora) in central California

Spawning behavior and external features of the larval development were studied in the chitons Mopalia muscosa and M. lignosa during the months of April-June, 1974, at Pacific Grove, California. ... The sequence of events in the development of the two species in the same, though some differences in timing exist

Computational Transport Modeling of High-Energy Neutrons Found in the Space Environment

The high charge and high energy (HZE) particle radiation environment in space interacts with spacecraft materials and the human body to create a population of neutrons encompassing a broad kinetic energy spectrum. As an HZE ion penetrates matter, there is an increasing chance of fragmentation as penetration depth increases. When an ion fragments, secondary neutrons are released with velocities up to that of the primary ion, giving some neutrons very long penetration ranges. These secondary neutrons have a high relative biological effectiveness, are difficult to effectively shield, and can cause more biological damage than the primary ions in some scenarios. Ground-based irradiation experiments that simulate the space radiation environment must account for this spectrum of neutrons. Using the Particle and Heavy Ion Transport Code System (PHITS), it is possible to simulate a neutron environment that is characteristic of that found in spaceflight. Considering neutron dosimetry, the focus lies on the broad spectrum of recoil protons that are produced in biological targets. In a biological target, dose at a certain penetration depth is primarily dependent upon recoil proton tracks. The PHITS code can be used to simulate a broad-energy neutron spectrum traversing biological targets, and it account for the recoil particle population. This project focuses on modeling a neutron beamline irradiation scenario for determining dose at increasing depth in water targets. Energy-deposition events and particle fluence can be simulated by establishing cross-sectional scoring routines at different depths in a target. This type of model is useful for correlating theoretical data with actual beamline radiobiology experiments. Other work exposed human fibroblast cells to a high-energy neutron source to study micronuclei induction in cells at increasing depth behind water shielding. Those findings provide supporting data describing dose vs. depth across a water-equivalent medium. This poster presents PHITS data suggesting an increase in dose, up to roughly 10 cm depth, followed by a continual decrease as neutrons come to a stop in the target

Ranging Apparatus and Method Implementing Stereo Vision System

A laser-directed ranging system for use in telerobotics applications and other applications involving physically handicapped individuals. The ranging system includes a left and right video camera mounted on a camera platform, and a remotely positioned operator. The position of the camera platform is controlled by three servo motors to orient the roll axis, pitch axis and yaw axis of the video cameras, based upon an operator input such as head motion. A laser is provided between the left and right video camera and is directed by the user to point to a target device. The images produced by the left and right video cameras are processed to eliminate all background images except for the spot created by the laser. This processing is performed by creating a digital image of the target prior to illumination by the laser, and then eliminating common pixels from the subsequent digital image which includes the laser spot. The horizontal disparity between the two processed images is calculated for use in a stereometric ranging analysis from which range is determined

Risk Allocation across the Enterprise: Evidence from the Insurance Industry

Financial researchers initially regarded hedging activities as a means to reduce total firm risk, which often is defined in terms of cash flow volatility. More recently, researchers have focused on the strategic allocation of risk. Direct tests of risk allocation have been problematic, however, because hedging data are rarely available and, when available, are specific only to a single operation of the firm, such as bank lending. In this study, we exploit unique data from the insurance industry that allows us to observe hedging proxies for both investment and insurance underwriting risks and test the risk allocation hypothesis developed in the finance literature. We also conduct separate examinations of life-health and property-casualty insurers, which reveal differences in the risks and hedging activities of these two types of insurers

Risk Allocation Across the Enterprise: Evidence From the Insurance Industry

Financial researchers initially regarded hedging activities as a means to reduce total firm risk, which often is defined in terms of cash flow volatility. More recently, researchers have focused on the strategic allocation of risk. Direct tests of risk allocation have been problematic, however, because hedging data are rarely available and, when available, are specific only to a single operation of the firm, such as bank lending. In this study, we exploit unique data from the insurance industry that allows us to observe hedging proxies for both investment and insurance underwriting risks and test the risk allocation hypothesis developed in the finance literature. We also conduct separate examinations of life-health and property-casualty insurers, which reveal differences in the risks and hedging activities of these two types of insurers

Employee Equity, Incentive Compensation, and Growth in Entrepreneurial Firms

We examined the relationship between employee equity compensation, incentive compensation, and firm growth using a sample of 480 privately held firms from the Ewing Marion Kauffman Foundation’s database of Ernst & Young Entrepreneur Of The Year (EOY) winners. Using frameworks from agency and motivation theories, we argued that larger percentages of both equity- and incentive-based compensation allocated to top managers and employees would be associated with firm growth. After controlling for firm and industry effects, the results of the study showed that while the firms in the sample preferred providing incentive compensation, providing equity compensation for employees was a positively significant predictor of firm growth over a three-year period. These findings suggest that prescriptions for growth in larger firms developed from agency theory also may be applicable to entrepreneurial firms, and founder/CEOs seeking to grow their firms should consider using equity compensation to motivate their current employees and to attract new ones

Numerical simulation of the final stages of terrestrial planet formation.

Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Science.Microfiche copy available in Archives and Science.Vita.Bibliography: leaves 140-143.Ph.D

Risky Asset Substitution in the Insurance Industry: An Historical Example

In the 1980s, life insurers sold guaranteed investment contracts (GICs) to pension plan sponsors, then backed these contracts with portfolios heavily weighted with higher risk assets such as common stocks and junk bonds. Ultimately this caused considerable loss, and history has repeated itself in many respects in recent years via holdings of equities and mortgage-backed securities. We evaluate the risky asset substitution in the life insurance industry from an historical perspective to determine if organizational form or other factors might be rationale for managerial decisions to engage in asset substitution. We find evidence that stock insurer managers are more likely than their mutual counterparts to engage in this type of risky asset substitution. Our findings provide rich ground for future research as the subprime mortgage and credit default swap debacles unfold, as well as public policy implications for insurance regulators concerned with the fiscal health of the insurance industry