The prior training and experience of the supervising elementary school principal in Massachusetts and Rhode Island

Thesis (Ed.M.)--Boston Universit

Microscope Cells Containing Multiple Micromachined Wells

Tech Briefs, May 2003 19 Manufacturing Microscope Cells Containing Multiple Micromachined Wells The cost per cell has been reduced substantially. John H. Glenn Research Center, Cleveland, Ohio An improved design for multiple-well microscope cells and an associated improved method of fabricating them have been devised. [As used here, "well" denotes a cavity that has a volume of about 1 or 2 L and that is used to hold a sample for examination under a microscope. As used here, "cell" denotes a laminate, based on a standard 1- by 3-in. (2.54- by 7.62-cm) microscope slide, that comprises (1) the slide as the lower layer, (2) an intermediate layer that contains holes that serve as the wells, and (3) a top layer that either consists of, or is similar to, a standard microscope-slide cover slip.] The improved design and method of fabrication make it possible to increase (relative to a prior design and method of fabrication) the number of wells per cell while reducing the fabrication loss and reducing the cost per cell to about one-tenth of the prior value. In the prior design and method, the slide, well, and cover-slip layers were made from silicate glass. The fabrication of each cell was a labor-intensive process that included precise cutting and grinding of the glass components, fusing of the glass components, and then more grinding and polishing to obtain desired dimensions. Cells of the prior design were expensive and fragile, the rate of loss in fabrication was high, and the nature of the glass made it difficult to increase the number of cells per well. Efforts to execute alternative prior designs in plastic have not yielded satisfactory results because, for typical applications, plastics are not sufficiently thermally or chemically stable, not sufficiently optically clear, and/or not hard enough to resist scratching. The figure depicts a cell of the present improved type. The slide and cover-slip layers are made of a low-thermal-expansion glass (Pyrex(TradeMark) or equivalent) and the intermediate (well layer) is made of SiO2 - a combination of materials that results in a laminate stronger than one made from layers of silicate glass. Before the layers are assembled into the laminate, the SiO2 layer is micromachined to form the wells plus shallow grooves that, when subsequently covered with the cover slip, become capillary channels that are used to fill the wells with samples. The micromachining is accomplished by use of the same patterning and etching techniques used to fabricate microelectromechanical systems (MEMS)

The Ursinus Weekly, May 19, 1947

Bruins trip \u27Fords for sixth success; Ross notches win • WSGA installs officers at dinner for women • Class of \u2748 names A. Simons, D. Helms to fill top offices • Ruby show offers eye-filling co-eds in modeling roles • AVC aims delivered by Mr. William Batt • Y conducts weekend of fellowship, planning • Alpha Psi Omega welcomes six Curtain Club initiates • Annex man to head next year\u27s sophs • FBI agent addresses students • Varsity Club slates Wednesday banquet • Last FTA program features discussion of Horace Mann • Language clubs elect officers • Choral group picks officers at final business meeting • Fifty hear Messiah recordings • Penn softball team routed as Erma Keyes whiffs ten • Cheyney choir will present concert here on Wednesday • Cricket team to meet \u27Fords • Group hears Mr. J. M. Hohlfeld • Netmen bow to \u27Fords; succumb to Drexel, 8-1 • Drexel nine rallies to trip bruins, 7-4; locals err thrice • Garnet, Drexel top bears in tri-meet • Brodbeck, Curtis tied for softball loop lead • Golfers beaten, 9-0, by strong Blue Hens • Thin-clads score at Rutgers • Women golfers mace S-more; are whitewashed by Beaver, 5-0 • H. Anderson\u27s hitting features 11-1 softball win over B. Mawr • Girls\u27 tennis team wins, 4-1 • Educator speaks at club dinner • Prof. has two articles publishedhttps://digitalcommons.ursinus.edu/weekly/1660/thumbnail.jp

HCI Requirements for eBusiness Computing

This paper provides an examination and categorization of Human Computer Interaction (HCI) requirements for the support of Electronic Business (eBusiness) and Electronic Commerce (eCommerce) in the context of intranets, extranets, and the Internet. The relationship of these HCI requirements to eBusiness is explored. Several methods are used to develop the requirements, including the application of grounded theory. The requirements uncovered are included in a framework to better enable the understanding of eBusiness requirements for the computer desktop

The intracellular distribution of radioiodine labeled lactogenic hormone in the rabbit mammary gland

The bulletin reports on Department of Dairy Husbandry Research Project 28, 'Hormone Enzymes'--P. [2].Digitized 2007 AES.Includes bibliographical references (pages 46-52)

Galaxy Mergers and Gravitational Lens Statistics

We investigate the impact of hierarchical galaxy merging on the statistics of gravitational lensing of distant sources. Since no definite theoretical predictions for the merging history of luminous galaxies exist, we adopt a parametrized prescription, which allows us to adjust the expected number of pieces comprising a typical present galaxy at z=0.65. The existence of global parameter relations for elliptical galaxies and constraints on the evolution of the phase space density in dissipationless mergers, allow us to limit the possible evolution of galaxy lens properties under merging. We draw two lessons from implementing this lens evolution into statistical lens calculations: (1) The total optical depth to multiple imaging (e.g. of quasars) is quite insensitive to merging. (2) Merging leads to a smaller mean separation of observed multiple images. Because merging does not reduce drastically the expected lensing frequency it cannot make $\lambda$-dominated cosmologies compatible with the existing lensing observations. A comparison with the data from the HST Snapshot Survey shows that models with little or no evolution of the lens population are statistically favored over strong merging scenarios. The specific merging scenario proposed by Toomre (1977) can be rejected (95\% level) by such a comparison. Some versions of the scenario proposed by Broadhurst, Ellis \& Glazebrook (1992), are statistically acceptable.Comment: uuencoded postscript file with figure