Very Low Power Cockcroft-Walton Voltage Multiplier for RF Energy Harvesting Applications

A device was required that could harvest the electromagnetic energy present in ambient radio frequency (RF) signals. A part of this device must convert the AC RF signal received by the antenna into a DC signal that can be used in an embedded application. Since the RF signal amplitude is small, it must first be amplified and rectified to become a usable signal. The Cockcroft-Walton voltage multiplier is a subsystem of the design which ideally converts a 100 mV AC signal coming from the antenna to a 350 mV DC signal. The output of the voltage multiplier is used to power another subsystem. At 10 MHz, the Cockcroft-Walton multiplier was able to output a DC voltage of 350 mV given an AC input signal of 140 mV. The results of the testing show verifiable proof-of-concept that the Cockcroft-Walton voltage multiplier has the potential to be used for low power RF energy harvesting applications

Mobile Device Policies in Archive Reading Rooms

Humanities scholars increasingly use mobile devices such as laptops, iPhones, and iPads in their professional lives. We are exploring the opportunities for employing such devices for supporting scholarly activities in archive reading rooms. As a first step in this process, we are studying how reading room policies related to the use of technological devices impact scholars’ interaction with the source materials in terms of capturing, organizing, note taking, and record keeping for future use of found materials. We studied the policy documents made available by thirty archives and complemented the results by soliciting the perspectives of administrators who craft these policies and scholars who use these archives. We present our analysis and an early prototype of a policy awareness mobile application called AMTracker.Informatio

Drug Policy and the HIV Pandemic in Russia and Ukraine

Over the past three years Russia and Ukraine have experienced one of the fastest growing HIV pandemics in Europe. In contrast to other parts of the world, the main driver behind the rate of infection is injecting drug use. Recent government policies have placed a heavy emphasis on reducing availability and on harsh punishments for drug users. This approach has not succeeded in significantly reducing the level of drug use. It has pushed the drug scene underground and increased risky behaviours among vulnerable groups. In the absence of measures to reduce infections and reverse the rate of transmission, the long-term impact of HIV/AIDS on population growth and economic development is likely to be grave

NJ and PA Once Again: What Happened to Employment When the PA-NJ Minimum Wage Differential Disappeared?

Card and Krueger's analysis of the impact of the 1992 increase in the NJ state minimum wage is very well known and still controversial. Interestingly, the original NJ-PA natural experiment was followed by another one involving the same two states, an experiment that has not yet been noted or examined. In 1996 and 1997, the federal minimum wage was increased in two steps, from $4.25 to$5.15, thereby increasing the minimum wage by $0.90 in PA but by just$0.10 in NJ. We use CPS data from 1995 and 1998 to examine the impacts on employment, using difference-in-difference and difference-in-difference-in-difference estimators that exploit within- state and between-state comparisons. We find consistent evidence that employment of “at-risk” groups was negatively impacted in PA relative to other groups in PA and to comparable groups in NJ.Minimum Wage, Card-Krueger

Ordering the Reidemeister moves of a classical knot

We show that any two diagrams of the same knot or link are connected by a sequence of Reidemeister moves which are sorted by type.Comment: This is the version published by Algebraic & Geometric Topology on 18 May 200

Longitudinal Study of Lanana Creek

A longitudinal study was done to collect data on the various conditions of LananaCreek in Nacogdoches, Texas over a seven week span from September 14 to November 2, 2018. The part of the creek studies is a 3.5 mile stretch from East Austin Street to Hoya Soccer Complex, mostly located on the campus of Stephen F. Austin State University. There were 6 different testing sites selected along this expanse. Collection of samples was performed by the General Chemistry I Honors class as part of the laboratory experience. Once collected, the samples were transported back to the lab for testing. The tests performed on the samples included determination of the pH, total solids, total dissolved solids, water hardness, anion concentration, and alkalinity. Each of these tests analyzes for a different parameter that is essential in evaluating the health of the ecosystem as a whole and gives a good reflection of the overall health of the creek’s surrounding environment. The results were compared to EPA standards. During the testing period, there were significant rain events generating variable results after each sampling, but the overall study shows that LananaCreek is healthy

The Only Early English Translation of Giovanni Botero’s Della ragion di stato: Richard Etherington and MS Sloane 1065

This is the final version of the article. It first appeared from the British Library via http://www.bl.uk/eblj/2016articles/article4.htm

First-Generation College Students & Campus Resources

The purpose of this research was to analyze how campus resources at Valparaiso University affect first-generation college students. Specifically, this study looked at the effect campus resources have on feelings of belonging on campus and academic success. First generation college students are defined as students whose parents have not obtained a four-year degree. This study used a questionnaire that was emailed to every known first-generation college student at Valparaiso University. This consisted of five sections: demographics, campus resource use, the campus community, academic preparedness, and experience. The use of campus resources section used a Likert scale to see how often students used different campus resources. The campus community and academic preparedness sections also used a Likert scale to see how much students related to questions such as, “I feel like I fit in at Valpo”. Finally, the experience section allowed for students to write in specific challenges they have faced on Valparaiso University\u27s campus. These results can help further develop the Persistence and Success Program (PSP), a first-generation college student program on campus

Trace formula for noise corrections to trace formulas

We consider an evolution operator for a discrete Langevin equation with a strongly hyperbolic classical dynamics and Gaussian noise. Using an integral representation of the evolution operator we investigate the high order corrections to the trace of arbitary power of the operator. The asymptotic behaviour is found to be controlled by sub-dominant saddle points previously neglected in the perturbative expansion. We show that a trace formula can be derived to describe the high order noise corrections.Comment: 4 pages, 2 figure