71 research outputs found
Local velocity measurements in the shrek experiment at high reynolds number
No full textWe report preliminary results obtained using new local velocity probes in the Superfluid Helium high REynold number von Kármán flow (SHREK) experiment for different forcing conditions. The presentation will focus on the validation of the signals obtained from a hot-wire and a total head pressure tube in both normal and superfluid phases of liquid helium
Review of \u3ci\u3eAmerican Farm Tools: From Hand-Power to Steam-Power\u3c/i\u3e By R. Douglas Hurt
No full textR. Douglas Hurt deals with the invention and development of American farm implements and machinery with a special emphasis on the nineteenth century. The material is organized around the functions of various agricultural machines used in the major grain-growing states. Ten chapters focus on the improvements made in plows, grain drills, corn planters, cultivators, reapers, binders, headers, corn binders, corn shellers, threshing machines, combined harvesters, mowing machines, hay stackers, feed mills, and steam traction engines.
The author decided to describe certain lines of farm equipment without trying to catalogue all agricultural tools, implements, and machines. Therefore the reader will not find descriptions of such items as cotton gins, saw mills, blacksmith tools, windmills, irrigation pumps, wagons, buggies, washing machines, and hardware materials. Also, during the period 1892 to 1914, no mention is made of the manufacture of the internal combustion engine and its uses in stationary gas engines, the early tractors, automobiles, trucks, and electric light plants.
The judicious use of 219 photographs and illustrations gives a visual presentation of the evolution of rural technology. The verbal descriptions of mechanical and technical matters can be readily understood by the general reader. The book includes a good bibliography and a helpful appendix to aid the reader in understanding the importance of metallurgy as an important factor in the manufacture of farm machinery. Better farm machinery had to wait until the making of steel had been perfected.
Some readers would welcome more analysis and interpretation of rural technology. For example, virtually all historians mention that our colonial forefathers used the wooden plow, the sickle, and the flail to grow crops, the same tools used thousands of years earlier in Biblical times. Why was this progress so slow? Why were no new machines invented in colonial America in the 170 years prior to the Revolutionary War? Why did it take two hundred years of experimentation before the first successful track-type Caterpillar engines were built in 1904? Combines were widely used in the Pacific Coast states in the 1880s, yet they were not adopted in the Midwest until the late 1920s, a lag of forty years. Perhaps historians should give more attention to the factors that deter progress and to the obstacles that prevent the adoption of new ideas, to try to explain the inability of people to adopt new methods.
Nevertheless, the narrative is informative and well written. American Farm Tools is a fine addition to the historical record
Captain Nathaniel Wyche Hunter and the Florida Indian Campaigns, 1837-1841
No full textIn January, 1837, Captain Nathaniel Wyche Hunter arrived at Fort Huleman, Florida, to engage in the military campaigns against the Seminole Indians. His letters and diaries during the next four years provide a vivid account of military life in the Peninsula State. Although his observations do not alter the history of the Seminole wars, they do reflect the thoughts of a perceptive officer facing the frustrations common to this theater of frontier warfare. They also present a soldier’s view of the United States government’s action in removing the Florida Indians to lands beyond the Mississippi river
An analysis of sub-swarms in multi-swarm systems
No full textLecture notes in Artificial Intelligence edited by D. Wang and M. Reynold
Completion plans, cultural identities, and sustainability
No full textYou are a part of a collegewide effort to increase access to education and empower students through "open pedagogy." Open pedagogy is a "free access" educational practice that places you - the student - at the center of your own learning process in a more engaging, collaborative learning environment. The ultimate purpose of this effort is to achieve greater social justice in our community in which the work can be freely shared with the broader community. This is a renewable assignment that is designed to enable you to become an agent of change in your community through the framework of the United Nations Sustainable Development Goals (SDGs). For this work, you will integrate the disciplines of Counseling and Business to achieve SDG #4: Quality Education with a focus on 4.4 and 4.7.Assignment Guideline
Diversity and sustainable personal impact
No full textYou are a part of a collegewide effort to increase access to education and empower students through "open pedagogy." Open pedagogy is a "free access" educational practice that places you - the student - at the center of your own learning process in a more engaging, collaborative learning environment. The ultimate purpose of this effort is to achieve greater social justice in our community in which the work can be freely shared with the broader community. This is a renewable assignment that is designed to enable you to become an agent of change in your community through the framework of the United Nations Sustainable Development Goals (SDGs). For this work, you will integrate the disciplines of Counseling and Business to achieve SDG #4: Quality Education with a focus on 4.7: By 2030, ensure that all learners acquire the knowledge and skills needed to promote sustainable development, including, among others, through education for sustainable development and sustainable lifestyles, human rights, gender equality, promotion of a culture of peace and non-violence, global citizenship and appreciation of cultural diversity and of culture’s contribution to sustainable development.Not peer reviewedassignment guidelinesUN Sustainable Development Goals Open Pedagogy Faculty Fellowshi
Student collaboration supporting UN SDG's
No full textYou are a part of a collegewide effort to increase access to education and empower students through "open pedagogy." Open pedagogy is a "free access" educational practice that places you - the student - at the center of your own learning process in a more engaging, collaborative learning environment. The ultimate purpose of this effort is to achieve greater social justice in our community in which the work can be freely shared with the broader community. This is a renewable assignment that is designed to enable you to become an agent of change in your community through the framework of the United Nations Sustainable Development Goals (SDGs). For this work, you will integrate the disciplines of Business and Academics to achieve SDG #4: Quality Education with a focus on 4.7 Sustainability.Assignment Guideline
Isolation and characterization of cDNAs differentially expressed between Cd8+ and Cd4+ T cell lines, 2002
No full textTo detect novel molecules involved in immune functions, a subtracted cDNA library between two closely related murine lymphoid cell lines was constructed using the suppression subtractive hybridization (SSH) technique. Both cells are cytotoxic T lymphocytes, however the 2C is a CD8+ cytotoxic T cell line and the 5.9 is an inflammatory CD4+T cell line (Thl). They can both secrete the cytolysin or perforin and are significantly resistant to cell-mediated lysis. When these two cell lines were subjected to prolonged exposure to reagents that deplete cells of ATP (2-deoxyglucose, sodium azide, and potassium cyanide), the 5.9 cell line became substantially susceptible, but the 2C and other CD8+ cell line still stood out as being strikingly resistant to granule- mediated lysis. A modified differential screening of colonies randomly picked from the constructed subtractive cDNA library and RNA blot analysis were used to identify cDNA clones expressed in 2C and/or 5.9 cytotoxic T cell lines. Thirteen cDNA clones were isolated, from which seven were expressed in both cell lines, and only two were expressed in 2C but not in 5.9 cell line. All the isolated cDNA clones were sequenced. A search of the Gene Bank database with the BLAST X program revealed no extensive homology of IB and 3F cDNA clones to known genes. Limited homology respectively to a zinc finger motif and the transcription factor MTF-1 were observed. Also RT-PCR analysis of cells purified from primary mixed lymphocyte reaction, demonstrated that both IB and 3F cDNA clones were expressed only in CD8+ but not in CD4+ purified cells. This approach of employing subtraction coupled with partial cDNA sequence determination can be useful for a first selection of putative functionally relevant molecules
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