Physiological assessment of operator workload during manual tracking. 1: Pupillary responses

The feasibility of pupillometry as an indicator for assessing operator workload during manual tracking was studied. The mean and maximum pupillary responses of 12 subjects performing tracking tasks with three levels of difficulty (bandwidth of the forcing function were 0.15, 0.30 and 0.50 Hz respectively) were analysed. The results showed that pupillary dilation increased significantly as a function of the tracking difficulty which was reflected by the significant increase of tracking error (RMS). The present study supplies additional evidence that pupillary response is a sensitive and reliable index which may serve as an indicator for assessing operator workload in man-machine systems

Determination of ball bearing dynamic stiffness

The dynamic radial stiffness characteristics of rolling element bearings are currently determined by analytical methods that have not been experimentally verified. These bearing data are vital to rotating machinery design integrity because accurate critical speeds and rotor stability predictions are highly dependent on the bearing stiffness. A tester was designed capable of controlling the bearing axial preload, speed, and rotor unbalance. The rotor and support structures were constructed to permit critical speeds that are predominantly determined by a 57 mm test bearing. A curve of calculated critical speed versus stiffness was used to determine the actual bearing stiffness from the empirical data. The results of extensive testing are used to verify analytical predictions, increase confidence in existing bearing computer programs, and to serve as a data base for efforts to correct these programs

Section 25-530—Venue or Jurisdiction?

On October 26, 1957, the writer of this paper received a letter from the Chairman of the Judicial Council enclosing a copy of a communication sent to all the members of the Judicial Council suggesting the consideration by the Council of the advisability of seeking an amendment to Section 25-530 of the Nebraska Revised Statutes to provide for venue of actions against nonresident defendants growing out of damages caused by the operation of motor vehicles by such nonresidents of Nebraska while using the public highways of this state in the county in which the accident and damages occurred. The letter suggests that under present Nebraska laws, such a nonresident, when not physically present in Nebraska, can only be found in Lancaster County, Nebraska, where the Secretary of State of the State of Nebraska, his statutory agent, resides. The letter further states that several district judges in this state have held that such actions may be brought only in Lancaster County, Nebraska. A determination of the question as to whether an action against a nonresident of the State of Nebraska for damages caused by such nonresident in the operation of a motor vehicle upon the public streets or highways of Nebraska can be brought in any county other than Lancaster County, the residence of the statutory agent of the nonresident requires the examination and consideration of five sections of Nebraska statutes, to-wit: Sections 25-408, 25-409, 25-504, 25-521, and 25-530

Section 25-530—Venue or Jurisdiction?

On October 26, 1957, the writer of this paper received a letter from the Chairman of the Judicial Council enclosing a copy of a communication sent to all the members of the Judicial Council suggesting the consideration by the Council of the advisability of seeking an amendment to Section 25-530 of the Nebraska Revised Statutes to provide for venue of actions against nonresident defendants growing out of damages caused by the operation of motor vehicles by such nonresidents of Nebraska while using the public highways of this state in the county in which the accident and damages occurred. The letter suggests that under present Nebraska laws, such a nonresident, when not physically present in Nebraska, can only be found in Lancaster County, Nebraska, where the Secretary of State of the State of Nebraska, his statutory agent, resides. The letter further states that several district judges in this state have held that such actions may be brought only in Lancaster County, Nebraska. A determination of the question as to whether an action against a nonresident of the State of Nebraska for damages caused by such nonresident in the operation of a motor vehicle upon the public streets or highways of Nebraska can be brought in any county other than Lancaster County, the residence of the statutory agent of the nonresident requires the examination and consideration of five sections of Nebraska statutes, to-wit: Sections 25-408, 25-409, 25-504, 25-521, and 25-530

Revisiting the Open Access Citation Advantage for Legal Scholarship

Citation studies in law have shown a significant citation advantage for open access legal scholarship. A recent cross-disciplinary study, however, gave opposite results. This article shows how methodology, including the definition of open access and the source of the citation data, can affect the results of open access citation studies

History of the Legal Status of the American Indian With Particular Reference to California

Since the first white men landed in this hemisphere the problem of how to handle the Indians has been of prime importance. Consistently the laws have decreed one way of treatment, and the actual practice of treating with the Indian in the field has been different. In many instances the Spanish, Portuguese, English, French, and Americans have despoiled and murdered the Indians. In this study the writer is interested in the laws and statutes that have been promulgated by the different countries involved as they relate to the Indians of this hemisphere historically, and reflect on the treatment of the Indians of California and their status today

Rotor response for transient unbalance changes in a nonlinear simulation

Transient unbalance shifts were determined not to excite a rotor instability in the high pressure turbomachinery of the Space Shuttle Main Engine using the current rotor dynamic models. Sudden unbalance changes of relatively small magnitudes during fast-speed ramps showed stable nonsynchronous motion depending on the resultant unbalance distribution at subsequent high speed dwells. Transient moment unbalance may initiate a limit cycle subsynchronous response that shortly decays, but a persistent subsynchronous with large amplitudes was never achieved. These limit cycle subsynchronous amplitudes appear to be minimized with lower unbalance magnitudes, which indicates improved rotor balancing would sustain synchronous motion only. The transient unbalance phenomenon was determined to be an explanation for synchronous response shifts often observed during engine tests

Citation Sources for Legal Scholarship: Ranking the Top 28 Law Faculties

This study examines the effects of the data source on citation metrics and faculty rankings by comparing three sources of legal scholarship citation data: Google Scholar, Westlaw, and HeinOnline. It compares six years of citations to works by all of the tenured and tenure-track members of the top twenty-eight faculties as determined by two recent legal citation studies. Rankings generated using the Leiter-Sisk method on the data from the three sources showed moderate to high correlation (0. 77 to 0. 96) to each other. Total citations and total publications for each faculty were moderately to highly correlated to rankings, while faculty size showed low to moderate correlation. Citations-per-faculty member showed very high correlation (0.98 to 0.99) to all three sources. Because citations-per-faculty member is such a strong driver of the Leiter-Sisk method, a school could game the rankings by buying out or otherwise moving less-cited or unproductive faculty, thereby reducing the number of faculty and increasing citations-per-faculty member. Use of metrics like the h-index, which only takes highly cited papers into account, or other composite metrics would reduce the opportunity for gaming in this manner.https://digitalcommons.law.buffalo.edu/law_librarian_book_sections/1004/thumbnail.jp