Torsional suspension system for testing space structures

A low frequency torsional suspension system for testing a space structure uses a plurality of suspension stations attached to the space structure along the length thereof in order to suspend the space structure from an overhead support. Each suspension station includes a disk pivotally mounted to the overhead support, and two cables which have upper ends connected to the disk and lower ends connected to the space structure. The two cables define a parallelogram with the center of gravity of the space structure being vertically beneath the pivot axis of the disk. The vertical distance between the points of attachment of the cables to the disk and the pivot axis of the disk is adjusted to lower the frequency of the suspension system to a level which does not interfere with frequency levels of the space structure, thereby enabling accurate measurement

Interpretation: Article I, Section 5

In Article I of the Constitution, the Framers vest the legislative authority of the United States government in a bicameral Congress, and over the ten sections of the Article they systematically flesh out the structure, duties, and powers of that Congress. In the early sections of Article I they describe the membership of each House, giving life to the “Great Compromise” of the Constitutional Convention under which each state has equal representation in the Senate but population-based representation in the House of Representatives. In Section 5, they grant Congress the power to govern itself. Section 5 consists of four separate clauses, each of which addresses different practical aspects of legislative procedure

Suspension systems for ground testing large space structures

A research program is documented for the development of improved suspension techniques for ground vibration testing of large, flexible space structures. The suspension system must support the weight of the structure and simultaneously allow simulation of the unconstrained rigid-body movement as in the space environment. Exploratory analytical and experimental studies were conducted for suspension systems designed to provide minimum vertical, horizontal, and rotational degrees of freedom. The effects of active feedback control added to the passive system were also investigated. An experimental suspension apparatus was designed, fabricated, and tested. This test apparatus included a zero spring rate mechanism (ZSRM) designed to support a range of weights from 50 to 300 lbs and provide vertical suspension mode frequencies less than 0.1 Hz. The lateral suspension consisted of a pendulum suspended from a moving cart (linear bearing) which served to increase the effective length of the pendulum. The torsion suspension concept involved dual pendulum cables attached from above to a pivoting support (bicycle wheel). A simple test structure having variable weight and stiffness characteristics was used to simulate the vibration characteristics of a large space structure. The suspension hardware for the individual degrees of freedom was analyzed and tested separately and then combined to achieve a 3 degree of freedom suspension system. Results from the exploratory studies should provide useful guidelines for the development of future suspension systems for ground vibration testing of large space structures

Evaluation of AnnAGNPS Model for Runoff Simulation on Watersheds from Glaciated Landscape of USA Midwest and Northeast

Runoff modeling of glaciated watersheds is required to predict runoff for water supply, aquatic ecosystem management and flood prediction, and to deal with questions concerning the impact of climate and land use change on the hydrological system and watershed export of contaminants of glaciated watersheds. A widely used pollutant loading model, Annualized Agricultural Non-Point Source Pollution (AnnAGNPS) was applied to simulate runoff from three watersheds in glaciated geomorphic settings. The objective of this study was to evaluate the suitability of the AnnAGNPS model in glaciated landscapes for the prediction of runoff volume. The study area included Sugar Creek watershed, Indiana; Fall Creek watershed, New York; and Pawcatuck River watershed, Rhode Island, USA. The AnnAGNPS model was developed, calibrated and validated for runoff estimation for these watersheds. The daily and monthly calibration and validation statistics (NSE \u3e 0.50 and RSR \u3c 0.70, and PBIAS ± 25%) of the developed model were satisfactory for runoff simulation for all the studied watersheds. Once AnnAGNPS successfully simulated runoff, a parameter sensitivity analysis was carried out for runoff simulation in all three watersheds. The output from our hydrological models applied to glaciated areas will provide the capacity to couple edge-of-field hydrologic modeling with the examination of riparian or riverine functions and behaviors

The Ursinus Weekly, December 17, 1969

Special centennial issue: Ursinus College\u27s 100th Anniversary, 1869-1969 • Editorial: The first hundred years • Focus: Nora Shuler Helfferich, Ursinus College\u27s oldest living alumnus • Reprinted articles: Pa. Governor Martin salutes President McClure and college at ceremony commemorating seventy-fifth anniversary; Ursinus adopts a war time program; Ursinus recipient of new gateway; Apology for peace; Freshman coed evaluates customs, finds friendly spirit on U.C. campus; Customs are savored; Chaperon, Why? Who?; WSGA is frowning on dungarees, slacks for Ursinus campus wear; When Shriner shrieks Ursinus sheiks come dashing from each dorm; Freshman President snatched by Sophs; Ursinus offers special class • Freeland Hall: Don\u27t let it be forgot • Ursinus raises $2,350,000;$550,000 still needed • Search into history substantiates claim of second oldest graduate that Freeland was everything • Ursinus administrators analyze past, present, and future • 1969 season climaxes 76 years • Mangan wins little All-American mention • Bears\u27 football since 1893 • Ray Gurzynski pilots Bear Harriers to 45-4 mark, two championships • Fifty years of girls\u27 field hockey at UC: Bearites to Snell-belles and champs • Albert leads UC Harriers to MAC championship • Footmen end season with 6-win record • 1969 MAC grid statistics • Concise history of Ursinus College: 1869 - present • Ursinus College: One century old, before and afterhttps://digitalcommons.ursinus.edu/weekly/1153/thumbnail.jp

Chronic methamphetamine effects on brain structure and function in rats

Methamphetamine (MA) addiction is a growing epidemic worldwide. Chronic MA use has been shown to lead to neurotoxicity in rodents and humans. Magnetic resonance imaging (MRI) studies in MA users have shown enlarged striatal volumes and positron emission tomography (PET) studies have shown decreased brain glucose metabolism (BGluM) in the striatum of detoxified MA users. The present study examines structural changes of the brain, observes microglial activation, and assesses changes in brain function, in response to chronic MA treatment. Rats were randomly split into three distinct treatment groups and treated daily for four months, via i.p. injection, with saline (controls), or low dose (LD) MA (4 mg/kg), or high dose (HD) MA (8 mg/kg). Sixteen weeks into the treatment period, rats were injected with a glucose analog, [18F] fluorodeoxyglucose (FDG), and their brains were scanned with micro-PET to assess regional BGluM. At the end of MA treatment, magnetic resonance imaging at 21T was performed on perfused rats to determine regional brain volume and in vitro [3H]PK 11195 autoradiography was performed on fresh-frozen brain tissue to measure microglia activation. When compared with controls, chronic HD MA-treated rats had enlarged striatal volumes and increases in [3H]PK 11195 binding in striatum, the nucleus accumbens, frontal cortical areas, the rhinal cortices, and the cerebellar nuclei. FDG microPET imaging showed that LD MA-treated rats had higher BGluM in insular and somatosensory cortices, face sensory nucleus of the thalamus, and brainstem reticular formation, while HD MA-treated rats had higher BGluM in primary and higher order somatosensory and the retrosplenial cortices, compared with controls. HD and LD MA-treated rats had lower BGluM in the tail of the striatum, rhinal cortex, and subiculum and HD MA also had lower BGluM in hippocampus than controls. These results corroborate clinical findings and help further examine the mechanisms behind MA-induced neurotoxicity

The Ursinus Weekly, May 1, 1969

Gordon to present theory of Mayans, Incas at Ursinus • Travelin\u27 II to highlight annual Scott Pierce concert • Ursinus student killed in tragic automobile mishap • U.C. plans Student Union; Students make proposals • Prom, Showboat spark weekend • Dr. Rice, group discuss various Velikovsky ideas • Editorial: We must know why • Focus: Fred Steckhahn • Revolution for the hell of it • Opinion: Dealing with campus disorder • Faculty portrait: Mrs. Downing • Polemic, Pt. 1 • Victory in Vietnam imminent; Gentled put-ons since 1962 • Label hang-up attacked • A.C. Festival • Wrice talks at Ursinus • Letter to the editor • Weekly presents senior countdown • Save us • Whatley comments on security • Protheatre work, Thieves carnival to be presented • Weekly snag: Credibility gap • U.S.G.A.: Fast Day success, jazz concert, Student Union • Structure of antibody revealed by Edelman • Festival scheduled for Parents Day • Beardwood hosts ISC conference • Kerr to discuss college level ed. at alumni seminar • Baseball team loses 3; Two games rained out • Howard\u27s netmen win three straight • Newly organized golf team captures first two matches • Towson included on grid schedule • PMC destroys thinclads; UC to seek revenge in May • Miss Campus Chest is exposed; Do you sleep in the nude? debuts as Campus Chest grinds to a halt • Co-ed accosted by young man known as Petehttps://digitalcommons.ursinus.edu/weekly/1174/thumbnail.jp