Passive acoustic quantification of gas releases

The assessment of undersea gas leakages from anthropogenic and natural sources is becoming increasingly important. This includes the detection of gas leaks and the quantification of gas flux. This has applications within oceanography (e.g. natural methane seeps) and the oil and gas industry (e.g. leaks from undersea gas pipelines, carbon capture and storage facilities). Gas escaping underwater can result in the formation of gas bubbles, and this leads to specific acoustic pressure fluctuations (sound) which can be analysed using passive acoustic systems. Such a technique offers the advantage of lower electrical power requirements for long term monitoring. It is common practice for researchers to identify single bubble injection events from time histories or time frequency representations of hydrophone data, and infer bubble sizes from the centre frequency of the emission. Such a technique is well suited for gas releases that represent low flow rates, and involving solitary bubble release. However, for larger events, with the overlapping of bubble acoustic emissions, the inability to discriminate each individual bubble injection event makes this approach inappropriate. In this study, an inverse method to quantify such release is used. The model is first outlined and following this its accuracy at different flow rate regimes is tested against experimental data collected from tests which took place in a large water tank. The direct measurements are compared to estimates inferred from acoustics.<br/

The Iowan Glaciation and the So-Called Iowan Loess Deposits

One cannot work in the Iowan Drift area and in adjacent areas of older drift without confronting the problem of the loess. During the field seasons of 1914 and 1915 while associated with Dr. Wm. C. Alden of the U. S. Geological Survey in reviewing the field evidences for and against an Iowan stage of glaciation, the writer became interested in certain phases of the loess and their interpretations. Through the kindness of his senior colleague, the writer has the privilege of briefly discussing these phases before the Iowa Academy of Science. A more complete discussion will appear in the forthcoming report of the Iowa Geological Survey in connection with the report on the investigations of the Iowan Drift, under the joint authorship of Doctor Alden and the writer

Post-Kansan Erosion

Visitors to the Maquoketa River gorge below Monticello in Jones County have been impressed with its rocky walls of the Niagaran formation which rise in places 100 to 125 feet above the stream. Overlying this rock formation are drift and loess. Crags, turrets, and chimney rocks, similar to the rugged features of the valleys of the driftless area, appear here and there. In fact, the characteristics of this gorge are so nearly like those of the valleys of the driftless area that in the report of the Geology of Jones County the gorge is considered to be pre-glacial in age

Telehealth Visits for Common Concerns in a Primary Care Setting: Establishing a Protocol

Background: Barriers to accessing healthcare in Vermont include: weather conditions, rurality, lack of public transportation systems, and busy schedules. Telehealth mitigates these barriers, providing a safe and effective option on par with in-person visits, while lowering overall healthcare costs and increasing patient satisfaction. This project aimed to expand telehealth visits in a nurse practitioner-run primary care practice, via designing effective protocols and educating clinicians on telehealth use, requirements, documentation, and billing in order to complete telehealth visits successfully. Methods: Infrastructure for telehealth: a workflow protocol, patient education materials, procurement of technological resources including iPads, and necessary, HIPAA compliant, secure accounts. Materials were presented to all clinicians and the practice supervisor, including a complete walk-through mock video visit. A six question Likert scale survey was administered post-presentation. Descriptive statistics were used to analyze survey results. Results: Surveys from 7 APRNs, and 1 MD (n=8) indicated that presentation and live video visit walk through were effective as 100% of clinicians agreed that it enhanced their knowledge and confidence across all measured responses, 75% or more strongly agreeing that presentation was effective. The protocol was successfully implemented on January 17th, 2020 after the educational presentation. Telehealth appointments are available for booking daily and are being used with no major flaws in the protocol identified. Conclusion: A formal protocol for implementation of expanded telehealth use was designed and established into the daily workflow, creating a quality improvement practice change at this clinic. Providing clinician education was associated with increased provider knowledge and confidence

Superimposition of Kansan Drift on Subaftonian Drift in Eastern Iowa

Many new exposures have been made by the Chicago, Milwaukee and St. Paul Railway in the reconstruction of their line across Iowa, Various ones of these have proved to be of especial interest to Pleistocene geologists, and among them are several cuts in the northern part of Clinton County, showing superimposition of the two oldest drifts, the Kansan drift on the Sub- Aftonian drift. This paper is devoted to a description of these and their interpretation

Additional Evidence of Post-Kansan Glaciation in Johnson County, Iowa

Johnson County offers a field of phenomena that are strikingly applicable to the theme of our late Pleistocene controversy, namely. “Has the northeast quarter of Iowa, except the Driftless Area, been invaded by an ice-sheet later than the Kansan?

Alien Registration- Leighton, Helen M. (Lubec, Washington County)

https://digitalmaine.com/alien_docs/2455/thumbnail.jp