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Walkers provided stability to the elderly but cannot assist a person from sitting to standing. The objective of this project is to present the design and analysis of a lift assist walker. This report discusses the design and analysis of a collapsible lift assist walker capable of lifting a patient up to 250 lbs. from seated to standing in under 10 seconds. The designed walker utilized a two stage scissor mechanism with a gas spring assisted embedded linear actuator.

Approved for public release; distribution is unlimited / This thesis estimates the frequency response of a network where the only data is the output obtained from an Autoregressive-moving average (ARMA) model driven by a random input. Models of random processes and existing methods for solving ARMA models are examined. The estimation is performed iteratively by using the Yule-Walker Equations in three different methods for the AR part and the Cholesky factorization for the MA part. The AR parameters are estimated initially, then MA parameters are estimated assuming that the AR parameters have been compensated for. After the estimation of each parameter set, the original time series is filtered via the inverse of the last estimate of the transfer function of an AR model or MA model, allowing better and better estimation of each model's coefficients. The iteration refers to the procedure of removing the MA or AR part from the random process in an alternating fashion allowing the creation of an almost pure AR or MA process, respectively. As the iteration continues the estimates are improving. When the iteration reaches a point where the coefficients converse the last VIA and AR model coefficients are retained as final estimates. / http://archive.org/details/armamodeling00kaya / Lieutenant Junior Grade, Turkish Navy

<p>Ever since it was published in 1982, Alice Walker’s The Color Purple has been celebrated for giving African-American women a voice and for challenging patriarchal structures in society, but it has also been criticised for being stereo-typical in its portrayal of African-American men and women. In this essay I claim that the novel in fact supports patriarchal American society. I discuss this by first looking at the parts of the novel that can be seen as challenging towards patriarchal structures, moving on to a more critical standpoint showing that the resistance towards patriarchal structures in the novel is not at all as strong as it may seem at first.</p>

Thesis (M.A.)--Ohio State University, 1974. / Includes bibliographical references (leaves 92-95). Available online via OhioLINK's ETD Center.

The Sawyer uranium prospect is a subsurface uranium occurrence hosted within the basal Oligocene Catahoula Formation of the Texas coastal plain. The host rocks consist of tuff-ball conglomerate, tuffaceous sandstone and tuffaceous claystone whose geometry and lithological characteristics indicate that they are the products of a crevasse-splay depositional environment. Compositionally, these lithologies are feldspar-depleted litharenites, with the feldspar depletion due to the corrosive, ore-forming processes. These sediments display pedogenic to early diagenetic features including diffuse to discrete micrite nodules, clay cutans, fresh to partially argillized glass shards, clay booklets, authigenic zeolites and sulfides, paleosoil horizons and calcite cement. Uranium mineralization occurs throughout the crevasse-splay channel sediments, with the richest accumulations (0.1% to 0.94% U308) concentrated in the tuff-ball conglomerates at the base of the channel sequences. Uranium is correlatable with anomalous concentrations of Pb, As, Rb and Y within the orebodies. Organic carbon content (0.01% to 0.28%) is uniformly low throughout the ore zone and does not display a significant correlation with uranium mineralization. No uranium minerals were detected by X-ray diffraction techniques; however, SEM energy dispersion analysis shows that uranium occurs as scaly encrustions adsorbed onto the surfaces of favorable mineral grains. The uranium-mineralized lithologies also host an appreciable amount of iron-disulfide minerals which provide data useful in the interpretation of ore paragenesis. Textural relationships between framboidal pyrite and ore-stage marcasite overgrowths provide evidence that the host rocks were reduced prior to uranium mineralization. The presence of organic carbon and botryoidal clusters of pyrite frmnboids suggests that the pre-ore reduction was accomplished by sulfate-reducing bacteria. This pre-ore reduction also resulted in the alteration of detrital ilmenite to pyrite and anatase. Following the initial reduction, the host rocks were invaded by oxygenated, uranium-enriched ground waters creating an oxidation-reduction interface along which uranium and associated trace elements were precipitated. The oxidation of pre-ore pyrite in the alteration tongue released Fe2 + and unstable sulfur oxyanions which were then available for further reaction upon entering the redox interface. The Fe2 + and free sulfur recombined under acidic conditions to form ore-stage marcasite as fine to coarse aggregates and as overgrowths surrounding framboidal pyrite. δ34S values of bulk sulfide samples (-9.9 to +8.4 per mil) support the interpretation of biogenic sulfide precipitation. However, the origin of the reductant responsible for post-ore re-reduction of the alteration tongue is uncertain.

Ever since it was published in 1982, Alice Walker’s The Color Purple has been celebrated for giving African-American women a voice and for challenging patriarchal structures in society, but it has also been criticised for being stereo-typical in its portrayal of African-American men and women. In this essay I claim that the novel in fact supports patriarchal American society. I discuss this by first looking at the parts of the novel that can be seen as challenging towards patriarchal structures, moving on to a more critical standpoint showing that the resistance towards patriarchal structures in the novel is not at all as strong as it may seem at first.

Recent high-resolution seismic imaging has allowed detailed reconstruction of the relationship between fold development and crestal faulting of the Chinook and Cascade folds in the deepwater Gulf of Mexico. Using 3-D seismic and biostratigraphic data, we have found that (1) short wavelength (~2300m), small amplitude folds (~540m) within the upper Cretaceous and upper Jurassic stratigraphic sequences took place no later than the late Jurassic, (2) large wavelength and amplitude fold growth, starting in the early Cretaceous, was produced by salt withdrawal, and (3) periods of increased sedimentation, fold growth, and fault slip occurred during the middle Miocene and late Miocene. Although the dominant stage of long wavelength, large amplitude fold growth started around early Cretaceous, the development of the Cascade and Chinook structures was continuous, punctuated by episodes of accelerated growth during the middle Miocene at rates of 337 and 235 m/Ma in the Cascade and 203 and 230 m/Ma in the Chinook. A later event of accelerated growth occurred during the late Miocene at rates of 1038 m/Ma in the Cascade and 1189 m/Ma in the Chinook. Accompanying fold growth was sedimentation, which was highest at 1949 m/Ma in the Cascade and 2585 m/Ma in the Chinook. Although limb tilt rates varied through fold growth, the highest rates also occurred during the middle Miocene at 0.330 and 0.196 degree/Ma for the Cascade and Chinook, respectively with the development of crestal faults at maximum slip rates of 88 and 90 m/Ma.

Thesis (Ed.D.)--Teachers College, Columbia University. / Typescript; issued also on microfilm. Sponsor: Robert Pace. Dissertation Committee: J. Marion Magill. Includes bibliographical references.

Thesis (M.A.)--Trinity Evangelical Divinity School, 2004. / Abstract. Includes bibliographical references (leaves 75-78).