111 research outputs found
Electrolytic survey of water pipes, Champaign-Urbana Illinois
Thesis (BS)--University of Illinois, 1914TypescriptIncludes bibliographical reference
Arrow-mounted ballistic system for measuring performance of arrows equipped with hunting broadheads
Measuring an arrow's ballistic performance such as arrow velocity on impact, total time of flight and arrow shaft oscillation is challenging because of the dynamic nature of arrow flight. This challenge becomes increasingly difficult as the distance of the shot increases. It is also of great interest to bowhunters to understand the ballistic performance of arrows that include hunting broadheads. A miniaturized, sensory data acquisition system, located in the arrow tip and engineered to withstand the high accelerations experienced at launch and impact, enables the precise measurement of arrow ballistics in flight. By continuously recording arrow drag in flight, the system enables measurement of the ballistic performance of an arrow as it travels downrange. The authors have also built an adapter that is connected to the housing of the sensing system to allow for comparative ballistic tests to be performed on hunting broadheads. Here, we present results obtained using the sensing system to perform initial testing on two commercially available broadheads at shot distances of approximately 45 m
High Frequency of Cytomegalovirus-Specific Cytotoxic T-Effector Cells in HLA-A*0201-Positive Subjects during Multiple Viral Coinfections
How the cellular immune response copes with diverse antigenic competition is poorly understood. Responses of virus-specific cytotoxic T lymphocytes (CTL) were examined longitudinally in an individual coinfected with human immunodeficiency virus type 1 (HIV-1), Epstein-Barr virus (EBV), and cytomegalovirus (CMV). CTL responses to all 3 viruses were quantified by limiting dilution analysis and staining with HLA-A*0201 tetrameric complexes folded with HIV-1, EBV, and CMV peptides. A predominance of CMV-pp65-speciflc CTL was found, with a much lower frequency of CTL to HIV-1 Gag and Pol and to EBV-BMLF1 and LMP2. The high frequency of CMV-speciflc CTL, compared with HIV-1- and EBV-specific CTL, was confirmed in an additional 16 HLA-A*0201-positive virus-coinfected subjects. Therefore, the human immune system can mount CTL responses to multiple viral antigens simultaneously, albeit with different strength
Accelerated testing methodology for long-term life prediction of cellulose-based polymeric composite materials
This chapter reviews literature concerning reports on the failure mechanisms that are commonly experienced in the techniques that have been developed to predict life expectancy of polymeric composite materials. It summarizes the main degradation mechanisms in polymeric composite materials, techniques used for estimating the life expectancy of polymers, standards for life prediction, and the properties of cellulose-based polymeric composites. The case study demonstrated the effects of incorporating cellulose derived from several resources to the properties of sand-cement block. The compressive strength of sand-cement block incorporated with bacterial cellulose was evaluated for three different periods. Results showed that bacterial cellulose nanofibers enhance the durability of bricks by increasing their compressive strength up to 27% and reducing the permeability and density of the sand-cement block. In conclusion, accelerated methodology is useful as a potential tool or vehicle for shelf life prediction of composite polymeric materials
2012 ACCF/AHA/ACP/AATS/PCNA/SCAI/STS guideline for the diagnosis and management of patients with stable ischemic heart disease
The recommendations listed in this document are, whenever possible, evidence based. An extensive evidence review was conducted as the document was compiled through December 2008. Repeated literature searches were performed by the guideline development staff and writing committee members as new issues were considered. New clinical trials published in peer-reviewed journals and articles through December 2011 were also reviewed and incorporated when relevant. Furthermore, because of the extended development time period for this guideline, peer review comments indicated that the sections focused on imaging technologies required additional updating, which occurred during 2011. Therefore, the evidence review for the imaging sections includes published literature through December 2011
The Moscow Hostage Crisis An Analysis of Chechen Terrorist Goals; Strategic Insights: v.2, issue 5 (May 2003)
This article appeared in Strategic Insights (May 2003), v.2 no.5Despite the resolution of the hostage situation by the government raid on 27 October, can this terrorist act be considered a success for the Chechens? After all, the Chechens were able to gain international media attention for their cause that they had failed to gain through two wars with Russia. They also were able to show that Chechens could bring the fight to the Russian capital. Infiltrating forces into the Russian capital was no small accomplishment. They had to cover thousands of miles and pass through many checkpoints moving by bus from Grozny to Moscow via Dagestan, crossing borders undetected by the many Russian border and police forces. They also smuggled automatic weapons and a large amount of explosives into the heart of Moscow and hid them for six months prior to the attack. The terrorists received these weapons just before the seizure of 800 Muscovites at the Dubrovka Theater, which is located just blocks from the Kremlin. This incredible feat showed the inability of the Russian government to prevent Chechens from bringing the battle to Moscow. And it could be used to buoy the spirits of people continuing to resist Russian forces back in Chechnya
Evocation of Behavioral Change by the Reinforcer is the Critical Event in both the Classical and Operant Procedures
By definition, in a Pavlovian (classical) procedure a stimulus is presented prior to an eliciting stimulus (reinforcing stimulus) in an operant procedure a response occurs prior to the reinforcer. In spite of the different contingencies implemented by the two procedures, some behavior necessarily precedes the reinforcer in the Pavlovian procedure and some stimulus necessarily precedes the reinforcer in the operant procedure. If conditioning depends on the momentary relation of environmental and behavioral events to a reinforcer, then the two procedures must begin by engaging a common conditioning process. The cumulative effects of that common process are different, however, because of differences in the frequency with which specific environmental and behavioral events are contiguous with the reinforcer (and its elicited response). The view that the critical reinforcing event is the evocation of a change in ongoing behavior evoked by the eliciting stimulus provides the basis for an interpretation of the conditioning process that encompasses the effects of both procedures
- …