Comparison of individual and paired learning for the measurement of retention

Thesis (Ed.M.)--Boston UniversityThe purpose of this study was to measure and compare retention between children working alone and with a partner using S.R.A. (Scientific Research Associates) reading materials. The S.R.A. laboratory is a series of graded reading experiences intended to be used by individual children working alone and at their own rate of speed. Its general purpose is to improve many reading skills but in this study the retention factor will be the only concern

Venus Radar Mapper (VRM): Multimode radar system design

The surface of Venus has remained a relative mystery because of the very dense atmosphere that is opaque to visible radiation and, thus, normal photographic techniques used to explore the other terrestrial objects in the solar system are useless. The atmosphere is, however, almost transparent to radar waves and images of the surface have been produced via Earth-based and orbital radars. The technique of obtaining radar images of a surface is variously called side looking radar, imaging radar, or synthetic aperture radar (SAR). The radar requires a moving platform in which the antenna is side looking. High resolution is obtained in the cross-track or range direction by conventional radar pulse encoding. In the along-track or azimuth direction, the resolution would normally be the antenna beam width, but for the SAR case, a much longer antenna (or much sharper beam) is obtained by moving past a surface target as shown, and then combining the echoes from many pulses, by using the Doppler data, to obtain the images. The radar design of the Venus Radar Mapper (VRM) is discussed. It will acquire global radar imagery and altimetry data of the surface of Venus

Studies Of The Cleavages And Stabilities Of Carbohydrate Epoxides And Epimines

A novel epoxide ring opening of benzyl 3,4-anhydro-2-benzylox-carbonylamido-2-deoxy-β-D-allopyranoside(I) was affected by phenylboronic anhydride in toluene. One of the products was demonstrated to be benzyl 2-benzyloxycarbonylamido-2-deoxy-4,6-0-phenylboronate-β-D-gulopyranoside. Another product isolated, while not identified, had the properties of an anhydro-sugar different from the starting compound(I). Benzyl 6-0-acetyl-2-benzyloxycarbonylamido-2-deoxy-β-D-allopyranoside(II) also underwent epoxide ring opening in a reaction with phenylboronic acid. An isolated product had the properties of a benzyl 2-benzyloxycarbonyiamido-2-deoxy-D-hexoside different from compounds isolate in the reaction of I with the phenyboronate. This indicated the necessity for an unsubstituted 6-OH group in order for the boron compound to be involved in the ring opening. Supporting this view is the lack of reaction between the blocked benzyl 2,3-anhydro-4,6-0-benzylidene-α-D-allopyranoside and phenylboronic anhydride. The 2,3-epoxide ring of benzyl 2,3-anhydro-4,6-0-benzylidene-α-D-allopyranodie(III) was shown to be remarkably stable in a reaction with boron acetate in nitromethane. The product had retained the 2,3-epoxide ring under conditions that removed the benzylidene group. Trimethylsilyl azide was prepared in good yield in a mild and direct method. The azide was then used to prepare a new, low-melting, compound by dilation of the 6-OH group of I. The epoxide ring remained stable under these conditions The epimine ring of benyl 4,6-0-benzylidene-2,3-dideoxy-2,3-epimino-α-D-allopyranodie(IV) was found to be unreactive with phenylboronate. However IV was deaminated with HNO2 to give the 2,3-unsaturated to give benzyl 4,6-0-benzylidene-α-D-mannopyranoside. The purpose of this study was to test the reactivity of sugar epoxides toward novel, ring-opening reagents. The study is especially concerned with the opening of the epoxide ring of benzyl 3,4-anhydro-2-benzyloxycarbonylamido-2-deoxy-β-D-allopyranoside, which has been found to be quite stable.1 These reagents were also used in a comparative study of the reactivity of epimino rings of sugars. Epimino rings react in a manner analogous to eposice rings. They have also been found to be quite stable in sugars.2,1

A Study of Christian (Systematic) Theology Books Used as Texts in A. T. S. Schools

In an era today of rapid growth in knowledge, the average contemporary man has forgotten the Creator, applauding only the creations of his own mind. It has been and is the task of theologians, whether pastors or professors,. to keep alive the option of belief in the reality of God--to remind man to clap. In the theologian\u27s field of knowledge, as in all arenas of thought, literary works have exploded, bombed, and even splintered in a mind-expanding wilderness of information. Access to this knowledge and its availability to theologians was the impetus for the following study