Evangelistic Sermons

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UV Raman and Fluorescence for Multi-Species Measurement in Hydrocarbon-Fueled High-Speed Propulsion

This report documents work performed through the NASA Graduate Student Researchers Program, Grant No. NGT3-52316. Research performed included investigation of two-line fluorescence imaging of OH for temperature measurement and an investigation of negative flame speeds for modeling of premixed turbulent flames. The laboratory work and initial analysis of the fluorescence imaging was performed at NASA Glen Research Center with follow up analysis at Vanderbilt University. The negative flame speed investigation was performed using an opposed jet flow simulation program at Vanderbilt University. The fluorescence imaging work is presented first followed by the negative flame speed investigation

1924-25: Abilene Christian College Bible Lectures - Full Text

PREFACE The lectures in this volume were delivered in the auditorium of Abilene Christian College during the last week of February in 1924 and 1925. Not all of the lectures delivered during these two weeks are given here, some of those delivering lectures not having responded with their manuscripts. These are given to the public in the belief that the splendid sermons delivered here ought to be read by thousands of Christians who did not have the opportunity of hearing them. Many of those who heard them will desire to read them. May this contribution to the literature of Christian teaching from the minds of some of our best and most faithful laborers in the Master’s vineyard be a continued blessing to all whose lives they touch. BATSELL BAXTER. __________________ PUBLISHER’S ANNOUNCEMENT This volume of Abilene Christian College Lectures is the fourth and comprises the lectures for February 1924 and 1925. The lectures for 1919 were published in one volume, 1920 and 1921 were combined in one volume, as were also the lectures for 1922 and 1923. By putting the lectures for two years in one volume, the reader is saved the expense of an additional book in order to receive the full benefit of these lectures. That these discourses are of great value is recognized by thousands who have heard them orally or have read them on the printed page. Such carefully prepared addresses really and truly merit a permanent place in the literature of the brotherhood of the churches of Christ. They are filled with expositions and analyses of much benefit to younger brethren who are entering upon lines of public service for the church, and they contain instruction on the word of God that is of much value to those out of the church as well as those in the church. The four books comprising the Abilene Christian College Lectures will make a most valuable addition to all libraries. We are at this time, January, 1926, in position to furnish complete sets or any volume to complete any broken set that any of our readers may have. When our present supply is gone, the books will probably not be reprinted as no plates have been made, and the books will be scarce. The messages of hope and love contained in this volume will find their place into the homes of many thousands, and it is to be ardently hoped that they will be read attentively and that they may contribute much to the extension of the power and kingdom of our Lord and Savior Jesus Christ. G. II. P. SHOWALTER. Austin, Texas, January 1, 1926

Hippocampus Leads Ventral Striatum in Replay of Place-Reward Information

While the brain is asleep, the hippocampus plays first fiddle in the orchestra of memory; spatial information is reactivated in the hippocampus shortly in advance of emotional memory traces in the vental striatum

The Temporal Signature of Memories: Identification of a General Mechanism for Dynamic Memory Replay in Humans

Reinstatement of dynamic memories requires the replay of neural patterns that unfold over time in a similar manner as during perception. However, little is known about the mechanisms that guide such a temporally structured replay in humans, because previous studies used either unsuitable methods or paradigms to address this question. Here, we overcome these limitations by developing a new analysis method to detect the replay of temporal patterns in a paradigm that requires participants to mentally replay short sound or video clips. We show that memory reinstatement is accompanied by a decrease of low-frequency (8 Hz) power, which carries a temporal phase signature of the replayed stimulus. These replay effects were evident in the visual as well as in the auditory domain and were localized to sensory-specific regions. These results suggest low-frequency phase to be a domain-general mechanism that orchestrates dynamic memory replay in humans

The spike-timing-dependent learning rule to encode spatiotemporal patterns in a network of spiking neurons

We study associative memory neural networks based on the Hodgkin-Huxley type of spiking neurons. We introduce the spike-timing-dependent learning rule, in which the time window with the negative part as well as the positive part is used to describe the biologically plausible synaptic plasticity. The learning rule is applied to encode a number of periodical spatiotemporal patterns, which are successfully reproduced in the periodical firing pattern of spiking neurons in the process of memory retrieval. The global inhibition is incorporated into the model so as to induce the gamma oscillation. The occurrence of gamma oscillation turns out to give appropriate spike timings for memory retrieval of discrete type of spatiotemporal pattern. The theoretical analysis to elucidate the stationary properties of perfect retrieval state is conducted in the limit of an infinite number of neurons and shows the good agreement with the result of numerical simulations. The result of this analysis indicates that the presence of the negative and positive parts in the form of the time window contributes to reduce the size of crosstalk term, implying that the time window with the negative and positive parts is suitable to encode a number of spatiotemporal patterns. We draw some phase diagrams, in which we find various types of phase transitions with change of the intensity of global inhibition.Comment: Accepted for publication in Physical Review

Frequency-specific hippocampal-prefrontal interactions during associative learning

Much of our knowledge of the world depends on learning associations (for example, face-name), for which the hippocampus (HPC) and prefrontal cortex (PFC) are critical. HPC-PFC interactions have rarely been studied in monkeys, whose cognitive and mnemonic abilities are akin to those of humans. We found functional differences and frequency-specific interactions between HPC and PFC of monkeys learning object pair associations, an animal model of human explicit memory. PFC spiking activity reflected learning in parallel with behavioral performance, whereas HPC neurons reflected feedback about whether trial-and-error guesses were correct or incorrect. Theta-band HPC-PFC synchrony was stronger after errors, was driven primarily by PFC to HPC directional influences and decreased with learning. In contrast, alpha/beta-band synchrony was stronger after correct trials, was driven more by HPC and increased with learning. Rapid object associative learning may occur in PFC, whereas HPC may guide neocortical plasticity by signaling success or failure via oscillatory synchrony in different frequency bands.National Institute of Mental Health (U.S.) (Conte Center Grant P50-MH094263-03)National Institute of Mental Health (U.S.) (Fellowship F32-MH081507)Picower Foundatio