3,098 research outputs found
Apollo communications system. Task E-59B - MSFTP-2 bit synchronizer performance analysis
Mathematical model for predicting performance degradation of MSFTP-2 bit synchronizer used in MSF
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Novel Nuclear Magnetic Resonance Techniques for Studying Biological Molecules
Valuing Distributed Energy Resources for Non-Wires Alternatives
Distributed energy resources (DER) as non-wires alternatives, regardless of
owner, have the potential to reduce system operating costs and delay system
upgrades. However, it is difficult to determine the appropriate economic signal
to incentivize DER investors to install capacity that will benefit both the DER
investors and the system operator. In an attempt to determine this co-optimal
price signal, we present a bilevel optimization framework for determining the
least cost solution to distribution system over-loads. A key output of the
framework is a spatiotemporal price signal to DER owners that simultaneously
guarantees the DER owners' required rate of return and minimizes the system
operation costs. The framework is demonstrated with a case by which the system
operator considers utility owned battery energy storage systems, traditional
system upgrades, and energy purchase from DER owners. The results show that by
valuing DER for non-wires alternatives the utility owned storage system sizes
can be reduced, less hardware upgrades are necessary, and upfront capital costs
as well as operating costs are reduced.Comment: under revie
Blogging in the physics classroom: A research-based approach to shaping students' attitudes towards physics
Even though there has been a tremendous amount of research done in how to
help students learn physics, students are still coming away missing a crucial
piece of the puzzle: why bother with physics? Students learn fundamental laws
and how to calculate, but come out of a general physics course without a deep
understanding of how physics has transformed the world around them. In other
words, they get the "how" but not the "why". Studies have shown that students
leave introductory physics courses almost universally with decreased
expectations and with a more negative attitude. This paper will detail an
experiment to address this problem: a course weblog or "blog" which discusses
real-world applications of physics and engages students in discussion and
thinking outside of class. Specifically, students' attitudes towards the value
of physics and its applicability to the real-world were probed using a
26-question Likert scale survey over the course of four semesters in an
introductory physics course at a comprehensive Jesuit university. We found that
students who did not participate in the blog study generally exhibited a
deterioration in attitude towards physics as seen previously. However, students
who read, commented, and were involved with the blog maintained their initially
positive attitudes towards physics. Student response to the blog was
overwhelmingly positive, with students claiming that the blog made the things
we studied in the classroom come alive for them and seem much more relevant.Comment: 20 pages, 6 figure
Characteristics of a Nonvolatile SRAM Memory Cell Utilizing a Ferroelectric Transistor
The SRAM cell circuit is a standard for volatile data storage. When utilizing one or more ferroelectric transistors, the hysteresis characteristics give unique properties to the SRAM circuit, providing for investigation into the development of a nonvolatile memory cell. This paper discusses various formations of the SRAM circuit, using ferroelectric transistors, n-channel and p-channel MOSFETs, and resistive loads. With varied source and supply voltages, the effects on the timing and retention characteristics are investigated, including retention times of up to 24 hours
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