Low Earth orbit environmental effects on the space station photovoltaic power generation systems

A summary of the Low Earth Orbital Environment, its impact on the Photovoltaic Power systems of the space station and the solutions implemented to resolve the environmental concerns or issues are described. Low Earth Orbital Environment (LEO) presents several concerns to the Photovoltaic power systems of the space station. These concerns include atomic oxygen interaction with the polymeric substrate of the solar arrays, ionized environment effects on the array operating voltage, the effects of the meteoroids and debris impacts and penetration through the different layers of the solar cells and their circuits, and the high energy particle and radiation effects on the overall solar array performance. Potential solutions to some of the degrading environmental interactions that will provide the photovoltaic power system of the space station with the desired life are also summarized

Assessment of the effects of space debris and meteoroids environment on the space station solar array assembly

The methodology used to assess the probability of no impact of space debris and meteoroids on a spacecraft structure is applied to the Space Station solar array assembly. Starting with the space debris and meteoroids flux models, the projected surface area of the solar cell string circuit of the solar array panel and the mast longeron, and the design lifetime, the possibility of no impact on the solar array mast and solar cell string circuits was determined as a function of particle size. The probability of no impact on the cell string circuits was used to derive the probability of no open circuit panel. The probability of meeting a certain power requirement at the end of the design lifetime was then calculated as a function of impacting particle size. Coupled with a penetration and damage models/correlations which relate the particle size to the penetration depth and damage, the results of this analysis can be used to determine the probability of meeting the lower power requirement given a degree of redundancy, and the probability of no impact on the solar array mast

Review of the environmental effects of the Space Station Freedom photovoltaic power module

An overview is provided of the environment in the low Earth orbit (LEO), the interaction of this environment with the Photovoltaic (PV) Power system of the Space Station Freedom is reviewed, and the environmental programs are described that are designed to investigate the interactions of the LEO environment with the photovoltaic power system. Such programs will support and impact the design of the subsystems of the PV module in order to survive the design lifetime in the LEO natural and induced environment

Effect of micrometeorid and space debris impacts on the Space Station Freedom solar array surfaces

Both solar and antisolar surfaces of the Space Station Freedom solar arrays are vulnerable to micrometeoroid and space debris impacts. Impacts on the solar surface result in damage to the active area of the solar cell and a corresponding reduction in generated power. Impacts on the antisolar surface could result in damage to the circuit which interconnects the cells which in turn may produce open circuit strings or panels. An evaluation is presented of the power degradation resulting from the impacts of micrometeoroid and space debris on the solar surface of the array blanket. Moreover, given a particle diameter that could damage the circuit interconnecting the cells, the probability of an open circuit panel is computed, along with the probability that the solar array blanket will meet the power requirement over the design lifetime

Bulky-yet-flexible carbene ligands and their use in palladium cross-coupling

In recent years, several classes of new N-heterocyclic carbene (NHC) ligands were developed around the concept of flexible steric bulk. The steric hindrance of these ligands brings stability to the active species, while ligand flexibility still allows for the approach of the substrate. In this review, the synthesis of several types of new classes, such as IBiox, cyclic alkyl amino carbenes (CAAC), ITent, and IPr* are discussed, as well as how they move the state-of-the-art in palladium catalyzed cross-coupling forward

Environmental interactions of the Space Station Freedom electric power system

The Space Station Freedom operates in a low earth orbit (LEO) environment. Such operation results in different potential interactions with the Space Station systems including the Electric Power System (EPS). These potential interactions result in environmental effects which include neutral species effects such as atomic oxygen erosion, effects of micrometeoroid and orbital debris impacts, plasma effects, ionizing radiation, and induced contamination degradation effects. The EPS design and its interactions with the LEO environment are briefly described and the results of analyses and testing programs planned and performed thus far to resolve environmental concerns related to the EPS and its function in LEO environment

Criminalizing the Other: Exploring the Impact of The Netherlands\u27 Adaptation of Prosecutorial Guidelines on Sentencing Disparities

This research explores the impact of the 2015 institution of prosecution guidelines in the Netherlands. Prior to this switch, the Openbaar Ministerie operated using a punishment point system, which provided a mathematical formula with which to decide sanctions. Though the motivation of this change was to make the overall system more efficient and enable individual prosecutors to consider each case in a customizable and more equitable form, this research demonstrates that the change has served instead as a perpetuator (and in some cases, facilitator) of the persistent ethnic and gender biases already at work in the Netherlands. The social and political history of the country has ensured generations of prejudice and disproportionate experiences within the criminal legal system, especially for racialized Others, which have resulted in discriminatory sentencing for those individuals. This paper shows that these experiences have not changed, or have become more aggravated, after the prosecution guidelines implementation

Covenant of Habitability and the Ohio Landlord-Tenant Legislation

With one exception noted later, Ohio courts have been loathe to accept the fact that enforcement of housing codes has been singularly ineffective on a large scale. Without an implied covenant of habit- ability in rental agreements, the indigent tenant today, living in squalid conditions and often lacking a viable alternative, has no effective means of bettering his condition. To remedy this problem, the Ohio legislature, on July 23, 1974, passed Amended Substitute Senate Bill Number 1032 defining the respective rights and obligations of landlords and tenants by holding the lessor of residential property to an implied covenant of habitability and providing several remedies for enforcing that warranty. This Note will explore the public policy favoring such a covenant, and also much of the existing common and statutory law already recognizing the seriousness of the plight facing the urban tenant. Additionally, Ohio\u27s landlord-tenant legislation will be examined to determine the respective rights, duties and respon- sibilities of both parties to a rental agreement