Stable transport in proton driven Fast Ignition

Proton beam transport in the context of proton driven Fast Ignition is usually assumed to be stable due to protons high inertia, but an analytical analysis of the process is still lacking. The stability of a charge and current neutralized proton beam passing through a plasma is therefore conducted here, for typical proton driven Fast Ignition parameters. In the cold regime, two fast growing Buneman-like modes are found, with an inverse growth-rate much smaller than the beam time-of-flight to the target core. The stability issue is thus not so obvious, and Kinetic effects are investigated. One unstable mode is found stabilized by the background plasma protons and electrons temperatures. The second mode is also damped, providing the proton beam thermal spread is larger than $\sim$ 10 keV. In Fusion conditions, the beam propagation should therefore be stable.Comment: Submitted to Po

Public Perceptions of the Midwest’s Pavements - Minnesota - Phase III (Targeted Survey Report)

This research is being conducted as part of a larger study of the public’s perceptions of state-maintained rural highway pavements in Wisconsin, Minnesota, and Iowa. Later stages of this project will involve interviewing residents of the three states by telephone to gather information about people’s concerns about the pavements in general and specific stretches of highways in particular. Information from this effort is expected to aid the states’ Departments of Transportation refine the standards used to set pavement reconstruction priorities to better meet the needs of residents

Public Perceptions of the Midwest’s Pavements - Wisconsin - Phase I (Focus Group)

This research is being conducted as part of a larger study of the public\u27s perceptions of state-maintained rural highway pavements in Wisconsin, Minnesota, and Iowa. Later stages of this project will involve interview;ing residents of the three states by telephone to gather information about people\u27s concerns about the pavements in general and specific stretches of highways in particular. Information from this effort is expected to aid the states\u27 Departments of Transportation refine the standards used to set pavement reconstruction priorities to better meet the needs of residents

Public Perceptions of the Midwest’s Pavements - Minnesota - Phase I (focus group)

This research is being conducted as part of a larger study of the public’s perceptions of state-maintained rural highway pavements in Wisconsin, Minnesota, and Iowa. Later stages of this project will involve interviewing residents of the three states by telephone to gather information about people’s concerns about the pavements in general and specific stretches of highways in particular. Information from this effort is expected to aid the states’ Departments of Transportation refine the standards used to set pavement reconstruction priorities to better meet the needs of residents

Laboratory Research

To properly interpret the rapidly growing body of data from comet observations, many types of laboratory measurements are needed. These include: (1) molecular spectroscopy in the visible, ultraviolet, infrared and microwave region of the spectra; (2) laser fluorescent spectroscopy of photofragments; (3) laboratory cross-section or reaction rate measurements using flow tube techniques, fluorescent spectroscopy detection for neutrals and ion-molecule reaction techniques; (4) experiments to simulate solar-wind interactions with comets; (5) studies of the properties and behavior of ice mixtures; (6) experiments on the sublimation rate of ice, and the phase transition from amorphous to crystalline ice; (7) investigations of the irradiation of ice; and (8) the electron impact dissociation and excitation of molecules of cometary interest. A nearly completed experiment on the proton irradiation of ice is described

Strong motion earthquake accelerograms, digitized and plotted data, Volume I - uncorrected accelerograms; Part C - Accelerograms IC041 through IC055

The first set of 20 uncorrected digitized earthquake accelerograms was published in July, 1969 as Volume I, Part A of the present series. That volume also contained introductory material and background information describing the methods used, accuracies, etc. which should be referred to by all users of the data. Parts A and B have contained accelerograms from earthquakes dating from March 10, 1933, and are a portion of a complete series planned in 1969 covering all the important accelerograms to that time. The San Fernando Earthquake, however, provided more than twice as many records as previously available. In view of the importance of this earthquake, it was felt that we should interrupt the original plan and issue this and succeeding Parts containing San Fernando Earthquake accelerograms, before returning to the original series. The record from Pacoima Dam has received a great deal of attention. Included here are 42 seconds containing the main shock and the first clearly identifiable aftershock, together with six further aftershocks. Because of its importance and the high trace amplitudes involved, the Pacoima record was digitized from the original paper film. All the remaining paper film records were digitized from contactnegatives. Although most reproductions of the Pacoima record indicate some dim portions of the trace, the original trace was clearly distinguishable with no ambiguity. The special problems of this particular accelerogram are treated in the paper by Trifunac and Hudson listed in the references on page 5. The six portions of the Pacoima record containing the aftershocks have the following starting times, measured in seconds after the start of the main shock trace: 52. 6, 69. 6, 104. 6, 162. 0, 230. 1, and 309. 1 sec. These starting times are indicated by arrows on the reproduction of the Pacoima record appearing on page 6. Records from-buildings or arrays containing more than one instrument are included together in one. Part where possible. Part C contains records from Holiday Inn at 8244 Orion Blvd., L. A. , the Kajima Building at 250 E. First St., L. A. , (three records each) and the Union Bank at 445 Figueroa St., L. A. (two records.). As in previous reports the printout and plots contain asterisks and arrows, respectively, .indicating where the record was shifted in the digitizer when required. We should like to express our gratitude to personnel from the Jet Propulsion Laboratory who have assisted so capably on the digitizing: Miriam Blount, Jeannyne Gunkel, Jo Jean Kos, Carolyn Level and Florence Sims. In. addition we should like to thank our regular digitizers and assistants, students and otherwise, for their conscientious. work: N. R. Bacheliri, D. A. Blount, Esther Dizack, R. C. Dullien, H. H. Kwai, H. H. Law, V. W: Lee, M. Y. -C. Ngan, W. J. Raymond and K. K. Tung. We would also like to acknowledge the general support off the Earthquake Research Affiliates. The whole program has at all stages been conducted through the generous help of grants from the National Science Foundation, and- we have enjoyed the close cooperation of the staff of the Seismological Field Survey of the National Oceanic and Atmospheric Administration

Analyses of strong motion earthquake accelerograms, Volume IV - Fourier amplitude spectra; Parts N, O, and P - Accelerograms IIN185 to IIN197, IIO198 to IIO201, IIO213, IIP214 to IIP223, IIP231 and IIP232

For each earthquake accelerogram, two spectrum plots are given -- a Fourier amplitude spectrum versus frequency on a linear scale and a log-spectrum, log-frequency plot. In this Volume IV series, Fourier amplitude spectra will be given for all corrected accelerograms, including building response measurements. The corrected records analyzed in this report, Volume IV, Parts N, O, and P, appeared in Volume II, Part N, Report No. EERL 74-54, and Volume II, Parts O and P, Report No. EERL 74-55. Their uncorrected versions were published in Volume I, Part N, Report No. EERL 72-27; Volume I, Part O, Report No. EERL 73-20; and Volume I, Part P, Report No. EERL 73-21

Strong motion earthquake accelerograms, digitized and plotted data, Volume I - uncorrected accelerograms; Part E - Accelerograms IE071 through IE085

The first set of twenty uncorrected digitized earthquake accelerograms was published in July, 1969 as Volume I, Part A, of the present series. That volume also contained introductory material and background information describing the methods used, accuracies, etc. , which should be referred to by all users of the data. The San Fernando Earthquake provided records of such importance that the original plan was interrupted after two parts, and Part C contained the first of the San Fernando Earthquake accelerograms. This issue continues the San Fernando accelerograms and contains fifteen records consisting of three records each from four buildings, two records from Santa Felicia Dam and a ground record from Wheeler Ridge. Some comments on these records follow. IE071. Wheeler Ridge. The entire 30 second record was digitized. The time marks functioned for only two seconds, and therefore the paper speed was calculated from an average value during the preceding calibration test. IE072, 73, 74. 4680 Wilshire Boulevard, Basement, 3rd and 6th Floors. There is a hesitation of 0.2 second duration in the record in the basement during the first second of operation. Aligning this record with the other two may consequently require considerable care. IE075, 76, 77. 3470 Wilshire Boulevard, Sub-basement, 5th and 11th Floors. The sub-basement record was digitized on a different machine from that at Caltech and only 44 seconds could be handled. The upper floor records were digitized to 64 seconds, just short of the total record length. IE078, 79, 80. Los Angeles Water and Power Building, Basement, 7th and 15th Floors. The basement record was digitized to 57 seconds by which time the first aftershock had diminished. The upper floor records were digitized for a further 15 seconds. IE081, 82, Santa Felicia Dam, Outlet Works and Crest. Both records have been digitized the total length. IE082, 83, 84. 3407 Sixth Street, Basement, 4th Floor and Penthouse. The entire 60 second records were digitized. As in previous reports the printout and plots of those records that require shifting in the digitizer contain asterisks and arrows, respectively, indicating where such shifts occurred

Analyses of strong motion earthquake accelerograms, Volume III - Response spectra; Part U - Accelerograms IIU294 through IIU313

This is one of a series of reports presenting earthquake response spectrum curves calculated from corrected accelerograms. In the preface to the first part, Volume III, Part A, Report No. EERL 72-80, there is a summary of response spectrum techniques in earthquake engineering which is available as background material for the data. For each earthquake accelerogram, two spectrum plots are given - relative velocity response versus period on a linear scale, and a tripartite log-log plot giving relative displacement, pseudovelocity, and pseudo-acceleration spectra. The Fourier spectrum is also shown on the linear plot. Digital printout of ordinates of the plotted curves are tabulated for each earthquake. The records analyzed in this report, Volume III, Part U, are the corrected accelerogram records contained in Volume II, Part U, Report No. EERL 75-51, and appeared in their uncorrected form in Volume I, Part U, Report No. EERL 73-26