Lawrence K. Williams

[Excerpt] In 1952, Professor Williams graduated cum laude from Tufts University. He received his Masters Degree in 1954 from the University Illinois. In 1960, he earned a PhD in psychology from the University of Michigan. Professor Williams served in the U.S. Army from 1954-56, and worked as a research psychologist. In 1961 he came to Cornell University as an assistant professor, and became a full professor in 1969. When he retired in 1999, his colleagues awarded him an emeritus professorship. During his long career, Professor Williams served for a period as chairman of the Department of Organizational Behavior and for 25 years was the director of graduate studies for the school of Industrial and Labor Relations. He served on the committees of over 250 graduate students and was chairman for more than 70 students. He was also one of the founders and directors of GOALS, a foundation to support under represented minority graduate students in Human Resources and Industrial Relations. Professor Williams was also a Fulbright scholar in Peru during 1967-72

Grain boundary partitioning of Ar and He

An experimental procedure has been developed that permits measurement of the partitioning of Ar and He between crystal interiors and the intergranular medium (ITM) that surrounds them in synthetic melt-free polycrystalline diopside aggregates. ^(37)Ar and ^(4)He are introduced into the samples via neutron irradiation. As samples are crystallized under sub-solidus conditions from a pure diopside glass in a piston cylinder apparatus, noble gases diffusively equilibrate between the evolving crystal and intergranular reservoirs. After equilibration, ITM Ar and He is distinguished from that incorporated within the crystals by means of step heating analysis. An apparent equilibrium state (i.e., constant partitioning) is reached after about 20 h in the 1450 °C experiments. Data for longer durations show a systematic trend of decreasing ITM Ar (and He) with decreasing grain boundary (GB) interfacial area as would be predicted for partitioning controlled by the network of planar grain boundaries (as opposed to ITM gases distributed in discrete micro-bubbles or melt). These data yield values of GB-area-normalized partitioning, K¯^(Ar)_(ITM), with units of (Ar/m^3 of solid)/(Ar/m^2 of GB) of 6.8 x 10^3 – 2.4 x 104 m^(-1). Combined petrographic microscope, SEM, and limited TEM observation showed no evidence that a residual glass phase or grain boundary micro-bubbles dominated the ITM, though they may represent minor components. If a nominal GB thickness (δ) is assumed, and if the density of crystals and the grain boundaries are assumed equal, then a true grain boundary partition coefficient (K^(Ar)_(GB) = X^(Ar)_(crystals)/X^(Ar)_(GB) may be determined. For reasonable values of δ, K^(Ar)_(GB) is at least an order of magnitude lower than the Ar partition coefficient between diopside and melt. Helium partitioning data provide a less robust constraint with K¯^(He)_(ITM) between 4 x 10^3 and 4 x 10^4 cm^(-1), similar to the Ar partitioning data. These data suggest that an ITM consisting of nominally melt free, bubble free, tight grain boundaries can constitute a significant but not infinite reservoir, and therefore bulk transport pathway, for noble gases in fine grained portions of the crust and mantle where aqueous or melt fluids are non-wetting and of very low abundance (i.e., <0.1% fluid). Heterogeneities in grain size within dry equilibrated systems will correspond to significant differences in bulk rock noble gas content

Dry Dilution Refrigerator with He-4 Precool Loop

He-3/He-4 dilution refrigerators (DR) are very common in sub-Kelvin temperature research. We describe a pulse tube precooled DR where a separate He-4 circuit condenses the He-3 of the dilution loop. Whereas in our previous work the dilution circuit and the He-4 circuit were separate, we show how the two circuits can be combined. Originally, the He-4 loop with a base temperature of ~ 1 K was installed to make an additional cooling power of up to 100 mW available to cool cold amplifiers and electrical lines. In the new design, the dilution circuit is run through a heat exchanger in the vessel of the He-4 circuit so that the condensation of the He-3 stream of the DR is done by the He-4 stage. A much reduced condensation time (factor of 2) of the He-3/He-4 gas mixture at the beginning of an experiment is achieved. A compressor is no longer needed with the DR as the condensation pressure remains below atmospheric pressure at all times; thus the risk of losing expensive He-3 gas is small. The performance of the DR has been improved compared to previous work: The base temperature of the mixing chamber at a small He-3 flow rate is now 4.1 mK; at the highest He-3 flow rate of 1.2 mmol/s this temperature increases to 13 mK. Mixing chamber temperatures were measured with a cerium magnesium nitrate (CMN) thermometer which was calibrated with a superconducting fixed point device.Comment: Cryogenic Engineering Conference 201

Recent results on the nonmesonic weak decay of hypernuclei within a one-meson-exchange model

We update our previous results for the nonmesonic decay of $^{12}_\Lambda$C and $^5_\Lambda$He. We pay special attention to the role played by Final State Intreractions on the decay observables. We follow a One-Meson-Exchange model which includes the exchange of the $\pi, \rho, K, K^*, \eta$ and $\omega$ mesons. We also present recent predictions for different observables concerning the decay of the doubly strange $^6_{\Lambda \Lambda}$He hypernucleus.Comment: 4 pages. Contribution to the Mesons and Light Nuclei'01 Conference, Prague, 2-6 July 200

MS-028: Papers of Daniel Chisholm, Co. K 116th PA, Civil War

The Chisholm papers include letters to friends and family members, mostly to his father, where he recounts interesting anecdotes of his war experiences and his thoughts on the Lincoln election and later assassination. There is a list of friends and soldiers who died in the war created by Daniel and his brother Alex, and a journal of Daniel’s which covers the fighting from November 8, 1864 to Lee’s surrender in April 1865. He comments on the action at Hatcher’s Run, Fort Stedman, White Oak Road, and Lynchburg Road Bridge. He also mentions General Humphrey’s taking command of the Second Corps, daily camp life and picketing, and the execution of deserters. Special Collections and College Archives Finding Aids are discovery tools used to describe and provide access to our holdings. Finding aids include historical and biographical information about each collection in addition to inventories of their content. More information about our collections can be found on our website https://www.gettysburg.edu/special-collections/collections/.https://cupola.gettysburg.edu/findingaidsall/1027/thumbnail.jp

A four channel He-3 cooled balloon-borne bolometer radiometer

A four channel He-3 cooled balloon-borne bolometer radiometer was constructed. The principal goal of the instrument is to measure the anisotropy of the 3 K cosmic background radiation on angular scales of 4 to 180 deg. The goal is to improve the sensitivity of the measurements to Delta T/T is less than .00001. A secondary goal is to survey the galactic thermal dust emission in the submillimeter range

Exhortation to Persevere and Grow in Holiness, Love, and Integrity (1 Thess 4:1-12) (Chapter in 1 & 2 Thessalonians)

Excerpt: In the first three chapters of 1 Thessalonians, Paul\u27s primary concern involved extending compassion and comfort to a suffering and troubled church. There is a gracious, warm, generous tone. He reminds them of how special they are, and how attentive God is to their plight. He reminds them of how God has worked among them in power in the past, he is at work in the present, and he will act again on their behalf through Messiah Jesus at his return. He confesses to them his longing to have close fellowship with them-they are loved and missed. But Paul\u27s purpose in writing is not purely to offer reassurance and comfort. He also writes to them to remind them of God\u27s expectations for their lifestyle and behavior. It is important for them to know that God has called them into his glorious kingdom\u27\u27 (2:12), but this calling is also a privilege, a lifelong response and responsibility. They are called to live according to kingdom standards. The constitution of their kingdom citizenship requires holiness, not impurity (4:7). Three main topics are treated in this early section of chapter four: holiness (4:1-8), love (4:9-10), and integrity (4:11-12)