DSN acquisition of Magellan high-rate telemetry data

The Magellan Project levied the stringent requirement of a 98 percent high-rate telemetry data capture rate on the Deep Space Network (DSN) during the Magellan Prime Mapping Mission. To meet this requirement, the DSN undertook extensive development of the DSN Telemetry System, as well as extensive DSN operation planning and test and training. In actuality, the DSN substantially exceeded the requirement by achieving a Prime Mapping Mission high-rate telemetry data capture rate of 99.14 percent. This article details the DSN telemetry system development, and DSN operations planning and test and training. In addition, the actual high-rate telemetry data outages are comprehensively presented and analyzed

Application of Subset Simulation to Seismic Risk Analysis

This paper presents the application of a new reliability method called Subset Simulation to seismic risk analysis of a structure, where the exceedance of some performance quantity, such as the peak interstory drift, above a specified threshold level is considered for the case of uncertain seismic excitation. This involves analyzing the well-known but difficult first-passage failure problem. Failure analysis is also carried out using results from Subset Simulation which yields information about the probable scenarios that may occur in case of failure. The results show that for given magnitude and epicentral distance (which are related to the ‘intensity’ of shaking), the probable mode of failure is due to a ‘resonance effect.’ On the other hand, when the magnitude and epicentral distance are considered to be uncertain, the probable failure mode correspondsto the occurrence of ‘large-magnitude, small epicentral distance’ earthquakes

Quantum Loop Subalgebra and Eigenvectors of the Superintegrable Chiral Potts Transfer Matrices

It has been shown in earlier works that for Q=0 and L a multiple of N, the ground state sector eigenspace of the superintegrable tau_2(t_q) model is highly degenerate and is generated by a quantum loop algebra L(sl_2). Furthermore, this loop algebra can be decomposed into r=(N-1)L/N simple sl_2 algebras. For Q not equal 0, we shall show here that the corresponding eigenspace of tau_2(t_q) is still highly degenerate, but splits into two spaces, each containing 2^{r-1} independent eigenvectors. The generators for the sl_2 subalgebras, and also for the quantum loop subalgebra, are given generalizing those in the Q=0 case. However, the Serre relations for the generators of the loop subalgebra are only proven for some states, tested on small systems and conjectured otherwise. Assuming their validity we construct the eigenvectors of the Q not equal 0 ground state sectors for the transfer matrix of the superintegrable chiral Potts model.Comment: LaTeX 2E document, using iopart.cls with iopams packages. 28 pages, uses eufb10 and eurm10 fonts. Typeset twice! Version 2: Details added, improvements and minor corrections made, erratum to paper 2 included. Version 3: Small paragraph added in introductio

Correlation functions for the three state superintegrable chiral Potts spin chain of finite lengths

We compute the correlation functions of the three state superintegrable chiral Potts spin chain for chains of length 3,4,5. From these results we present conjectures for the form of the nearest neighbor correlation function.Comment: 10 pages; references update

Co-Morbidity Of Alzheimer’s Disease And Stroke: Cognitive Deficits And Cellular Pathologies In Two Co-Morbid Animal Models

Prior to beta-amyloid (Aβ) protein accumulation into plaques in Alzheimer’s disease (AD), neuroinflammation and oxidative stress have been shown to contribute to early cognitive decline. These cellular pathologies are coincident in stroke, which is considered a risk factor for AD. This study investigated the co-morbid effects of AD and stroke on behavioural and cellular pathology in two rodent models. Motor function, memory and microglial neuroinflammation were investigated in a stroke and Aβ injection model and mutant human amyloid precursor protein (APP) transgenic model with stroke. Injections of endothelin-1 into the right striatum were used to model stroke and AD was modelled through either intracerebroventricular Aβ25-35 injections or a transgenic rat that overproduces a mutated form of human APP. Furthermore, the effectiveness of a targeted antioxidant therapy (CAT-SKL) was investigated in the stroke and Aβ injection model. Memory deficits were present in both co-morbid conditions and CAT-SKL was able to ameliorate the memory deficit in the stroke and Aβ injection model. In the transgenic model, the co-morbid condition resulted in gait alterations. Levels of activated microglia in the infarct region were increased in the transgenic co-morbid condition. Exacerbation of activated microglia in the basal forebrain of the co-morbid stroke and Aβ injection model was observed and was attenuated by CAT-SKL treatment. The findings of this study demonstrate the co-morbid effects in the pathogenesis of AD pathologies. This study suggests that neuroinflammation plays a crucial role in AD and use of targeted therapies, such as CAT-SKL, should be the focus of future research on therapeutic strategies for AD

Comment on ``A new efficient method for calculating perturbative energies using functions which are not square integrable'': regularization and justification

The method recently proposed by Skala and Cizek for calculating perturbation energies in a strict sense is ambiguous because it is expressed as a ratio of two quantities which are separately divergent. Even though this ratio comes out finite and gives the correct perturbation energies, the calculational process must be regularized to be justified. We examine one possible method of regularization and show that the proposed method gives traditional quantum mechanics results.Comment: 6 pages in REVTeX, no figure

Biological relationships of mites associated with insects

Thesis (M.A.)--Boston University, 1950Our knowledge of Acarina is limited. Life histories have not been studied because it is difficult to rear these mites in the laboratory. Of the two-hundred or more identified mite larvae known in 1946, only twelve are known as nymphs or adults. However, this lack of knowledge in taxonomy does not appear to hinder the work on the biological relationships of mites associated with insects. Mites attacking members of the order, Orthoptera, were described by Lawrence (1940), Howard (1918), Hamilton (1914), Wehrle and Welch (1925), and Radford (1946). The mites attacked mainly the grasshoppers and locueta. These mites belonged to four families: Trombidiidae, Erythraeidae, Tarsonemidae, and Tyroglyphidae. Walsh (1868), Shimer (1868), Lignieres (1893), Riley (1873), and Ewing (1912) gave accounts of mites attacking the scale insect eggs and adults. These mites, which play an important part in the natural control of scale insects, include: Hemisarcoptes malus (Shimer), Monieziella entomophaga Laboulbene, Tydeus cocoophagus Ewing, Bdells cardinalis Banks, Cyta brevipalpa Ewing, Anystis agilis Banks, Eupalus sp., Tetranychus telariue Linne, and Oribata sp.. Of the mites which are parasitic on members of the order Hymenoptera, the most important one is Acarapis woodi (Rennie) which is the causative agent of the well-known Isle of Wight disease of honey bees. The mites infest the tracheal system of the bees and cause death due to the possible secretion of a toxic substance by the mite. White (1921), who reported on this acarine disease, experimented with healthy bees in an attempt to secure information on the mechanical effects of obstruction of the honey bee's tracheal system. The transmission of this disease was reported on by Burnside, Sturtevant, and Halst (1949). Other mites associated with hymenopterans were commensals. The Gamasid mites of the genus, Antennophorus, were described by Wheeler (1910) and Michael (1891, 1894). A certain biological specificity in the relationships with ants wes shown by these mites. One species of Gamasid mite usually was found with only one or two species of ants. LeVeque (1930, 1931) worked extensively on the mites belonging to the genus, Dinogamasus, Kramer. She described several new species of this genus and listed the different groups in whioh the species of Dinogamasus were placed. The groups listed were the perkinsi group, the alfkeni group, the ootoconus group, and the braunsi group. Descriptions of oommon features of the members of the groups and keys for distinguishing between the various species were also included. Marshall (1938), Shapiro, Saliternik, and Belferman (1944) reported the finding of larvae of bydrachnid mites as external parasites on adult mosquitoes. Other records of these water-mite larval parasites were made by Wolcott (1905) and Soar and Williamson (1925). The larvae of Hydrachna (Mulller) Latreille live parasitically on aquatic insects, larvae of Limnoohares Latreille live parasitically on water-bugs, larvae of Eylais Latreille are parasites on insects which leave the water and became aerial, and larvae of the family Hydryphantidae leave the water and live parasitically on aerial fnsects. Mites found on Buprestid beetles and Cerambycid beetles attack in particular in the ventral joints and sutures of the host insect. Lawrence (1940a) described a mite, Pysmephorus crassipes, which was found on the beetles. Anothe mite parasite of beetles, Uropoda vegetans de Geer, reported on by Riley (1877), developed an adaptive organ for attachment. The organ was an extensile organ which issued from the anal vent just beneath the extremity of the body and stuck to the beetle by means of a flattened disc. The mite parasite, Pediculoides ventricosus Newport, which attacks the grain moth, Sitotroga oereallela Oliv. is beneficial to man. It acts as a natural control for the destruction of the grain moth. More recently in 1948 mites of the genus Leptus were found parasitic on species of Corythucha. This discussion given on mite-insect relationship is not by any means complete, but it does point to the fact that investigations have been carried out and that there are great opportunities tor any researcher who may be interested in this field of study

Remote sensing of Pacific hurricane and radiometric measurements from foam and slicks

There are no author-identified significant results in this report

A strategic study of establishing the industrial needs in pattern design and technology in Mainland China

2007-2008 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe