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Paleoindians buried Spirit Cave Man in a Nevada cave, and archaeologists excavated these remains in 1940. Radiocarbon testing in 1996 dated the burial and associated grave goods as older than 10,700 years. Living just 10 miles from Spirit Cave, the Fallon Paiute-Shoshone Tribe filed a NAGPRA claim in 1997 requesting the repatriation of the Spirit Cave ancestor they call “The Storyteller.” This claim ignited a 20-year legal dispute that led the Fallon Paiute-Shoshone Tribe to make the gut-wrenching decision to permit DNA testing. This article documents a 10,000-year genetic continuity firmly linking Paleoindians at Spirit Cave to the Lovelock culture and that strongly suggests continuities to modern Paiutes living there today with no population replacement. We explore the associated radiocarbon record of these dynamics to understand the syncopated population movements that responded to shifting resource distributions. Resilience theory provides an operational way to understand this extraordinary continuity through key concepts, including tipping points, early warning signals, sunk-cost effects, and loss-of-resilience hypotheses. The Spirit Cave case also underscores the moribund concepts and assumptions underlying a century of Great Basin anthropological study that misread this long-term episode of Indigenous resilience and survivance.
Objectives/Goals: The University of Minnesota (UMN) CTSI and Medical School sought to increase the diversity of translational research-intensive faculty by recruiting highly promising new-to-UMN tenure track faculty in the Medical School. Increased resources and career development will increase recruitment and address barriers to their promotion and success. Methods/Study Population: In 2019, the Medical School Dean committed to fund 15 Early Career Research Awards (ECRA) Scholars to recruit outstanding new-to-UMN, tenure track faculty. Supplementing usual departmental recruitment packages, ECRA Scholars receive: 75% salary and fringe benefit support for 3 years; an additional $500,000 of research funds; and augmented mentoring and coaching with required participation in the relevant CTSI career development program. Department Chairs propose meritorious candidates for Review Committee consideration based on the Chair nomination letter, scientific plan, mentoring plan, CV, and additional letters of recommendation. To foster community building, there is an annual mini-retreat for the ECRA Scholars and other underrepresented CTSI Scholars with an external visiting professor. Results/Anticipated Results: Fifteen tenure-track faculty have been recruited as ECRA Scholars since 2019 into 9 different departments. One additional Scholar has been accepted and three have completed the program. Three ECRA Scholars were K awardees at the time of recruitment. The CTSI career development programs utilized were the K Accelerator (10), KL2 Scholar (2), and K-R01 (5) Programs, with 3 involved in two programs. The Scholar degrees include 10 PhDs, 3 MD/PhDs, and 2 MDs, with additional MPH/MS (5), MSW (1), and DPT (1) degrees. ECRA Scholars have been awarded multiple NIH R21, Foundation, and internal grants currently under review include Ks and R01s with 5 additional K, 2 new R01, and 1 revised R01 submissions planned for the 2024–2025 academic year. Discussion/Significance of Impact: The ECRA program has successfully augmented recruitment of outstanding underrepresented research-oriented early-stage faculty to the University of Minnesota School of Medicine, contributing to many Departments. The CTSI has provided career development, networking, and a broader community of Scholars, with increased diversity in CTSI programs.
Objectives/Goals: In Fall 2024, we designed a collaborative scholar retreat model to create dialogue among our training programs. The purpose of the retreat was to foster collaboration and provide unique networking opportunity for our KL2, T32, and TL1 scholars to share their research across the translational spectrum and learn more about Clinical and Translational Science Institute (CTSI) resources and tools. Methods/Study Population: The CTSI Fall Scholar Retreat brought together a diverse group of 25 scholars who attended in-person a full-day program. The program included presentations on CTSI resources and Team Science on How to Become a Better Team Member in cross-disciplinary and cross-functional groups. The KL2 Scholars presented motivational talks on their career and professional development journeys. Mentoring roundtable included discussions on subthemes like characteristics of a good mentor/mentee, organizing your mentoring team, different mentor roles, and fears of approaching new mentor/mentee. TL1 and T32 scholars also presented posters describing their ongoing research project from the planning stages to initial observations to completed studies. Results/Anticipated Results: To measure the effectiveness and impact of the CTSI Fall Scholar Retreat, we conducted an evaluation using REDCap survey and received an 88% response rate. On the Likert scale of 1–5 (1 = not at all valuable, 2 = not very valuable, 3 = neutral, 4 = very valuable, and 5 = extremely valuable), 92% of the scholars found the sessions to be valuable. Net Promoter Score of 9.6 (scale of 1–10) was measured to collect the scholar feedback and most of them are likely to recommend the Scholar Retreat to other scholars. Discussion/Significance of Impact: The in-person retreat proved to be a unique platform to interact, collaborate, learn, and grow for all scholars at different levels of their career and research. Inclusion of HRSA-funded T32 post-doctoral program provided cross-level collaboration and helped promote a culture of continuous learning in clinical and translational science.
What problem do today’s circuits address? The very general task of improving performance, through the application of negative feedback, of a great many of the circuits we have met to this point.
In our own version of this course, only a minority of the busy students choose to do projects. But a project can be heaps of fun. To help you conceive of one, here is some information on gadgets and ideas that might inspire a project builder, along with sketches of some great projects of yester-term.
Here, we’d like you to show you how to do one task many ways. This is a favorite device of exam-writers; this kind of question lets the teachers feel that there’s some coherence in the digital material. Students may not feel the same way about these questions.
In this chapter you will configure the Timer/Counter peripheral to interrupt the CPU at a constant rate to output a sampled sine wave from the DAC. On the way, you will land on the Moon.
Deliberate rolling-off of op-amp gain as frequency rises: used to assure stability of feedback circuits despite dangerously-large phase shifts that occur at high frequencies.
In the previous lab, you configured the SAMD21’s internal 10-bit Digital-to-Analog converter to output an analog voltage to an I/O pin and then used the DAC to synthesize a 128 point sine wave. While this worked, updating the DAC in a loop did not provide precise control over the frequency of the output signal and the process of sending data values to the DAC consumed all the processor CPU cycles. This design also did not ensure that samples were output at constant time intervals.
Prehistory: before the microprocessor: Yes, there was a time when computers roamed the Earth, but were not based on microprocessors. In the 1930s electromechanical computers were built using relays; some were true “Turing machines,” fully programmable.
The notion of multiplexing, or time-sharing, is more general and more important than the piece of hardware called a multiplexer (or “mux”). You won’t often use a mux, but you use multiplexing continually in any computer, and in many data-acquisition schemes.
Until now, as we have said in Chapter 8N, we have treated positive feedback as evil or as a mistake: it’s what you get when you get confused about which op-amp terminal you’re feeding. Today you will qualify this view: you will find that positive feedback can be useful: it can improve the performance of a comparator; it can be combined with negative feedback to make an oscillator (“relaxation oscillator”: positive feedback dominates there); or to make a negative impedance converter (this we will not build, but see AoE §4.107, Fig. 4.104: there, negative feedback dominates).
Adjust frequency so as to get a useful image: too high, and you won’t allow time enough to see the waveform move far; too low, and you’ll see the full waveform, but using just a small portion of the scope screen, and thus your time measurements will be only approximate.
The sort of problem we mean to solve with the most important of today’s circuits is the conversion of a sinusoidal power supply voltage – AC coming from the wall supply (often called “line” voltage) – to a constant DC level.
These are just lines that make lots of stops, picking up and letting off anyone who needs a ride. The origin of the word is the same as the origin of the word for the thing that rolls along city streets.
How many bits does the converter need? We can tolerate slices that are two parts in 10,000 wide, or 1/5k. 12 bits give 4K slices (4096), and give an error of 1/8K or 0.012%: this does not quite satisfy the specification.
In the previous microcontroller labs you controlled the I/O ports directly to scan a matrix keyboard, programmed a timer to interrupt at regular intervals to output a sine wave at a specific frequency, and initiated SPI communications with a LCD display to show text messages. In this lab you are going to integrate these elements into a jukebox that plays children’s lullabies using an RTOS.
So far, we have been using (wasting?) one FPGA logic cell flip-flop to create each bit of RAM memory and one or more logic cells for each ROM bit. This is inefficient and, for anything more than a small memory array, could leave us without enough logic cells to implement the rest of our design or require a larger, more expensive device.