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Sir Isaac Newton (?) showing an optical experiment to an audience in his laboratory. Wood engraving by Martin after C. Laverie.
Posted August 9, 2020
The Laser Institute of America (LIA) is revising Z136.8 Standard for Safe Use of Lasers in Research, Development or Testing. This standard provides recommendations for the safe use of lasers and laser systems that operate at wavelengths between 180 nm and 1 mm and are used to conduct research or used in a research, development, or testing environment. This environment is not limited to universities and national laboratories, but includes medical research facilities and high-tech product development evaluation settings.
You may obtain the public review draft at the link below:
https://www.lia.org/store/product/brsz1361-202x-draft-1-public-review
Comments due September 21st.
Send comments (with optional copy to psa@ansi.org) to: Liliana Caldero (lcaldero@lia.org)
We maintain the LIA consensus product suite on the standing agenda of our periodic Laboratory and Nota Bene teleconferences. See our CALENDAR for the next meeting.
Issue: [13-37]
Category: Facilities Asset Management, Risk Management, Public Safety
Colleagues: Richard Robben, Markus Schaufele
Source: ANSI Standards Action
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Noncooperative Cellular Wireless with Unlimited Numbers of Base Station Antennas
New York University Department of Electrical and Computer Engineering
ABSTRACT: A cellular base station serves a multiplicity of single-antenna terminals over the same time-frequency interval. Time-division duplex operation combined with reverse-link pilots enables the base station to estimate the reciprocal forward- and reverse-link channels. The conjugate-transpose of the channel estimates are used as a linear precoder and combiner respectively on the forward and reverse links. Propagation, unknown to both terminals and base station, comprises fast fading, log-normal shadow fading, and geometric attenuation. In the limit of an infinite number of antennas a complete multi-cellular analysis, which accounts for inter-cellular interference and the overhead and errors associated with channel-state information, yields a number of mathematically exact conclusions and points to a desirable direction towards which cellular wireless could evolve. In particular the effects of uncorrelated noise and fast fading vanish, throughput and the number of terminals are independent of the size of the cells, spectral efficiency is independent of bandwidth, and the required transmitted energy per bit vanishes. The only remaining impairment is inter-cellular interference caused by re-use of the pilot sequences in other cells (pilot contamination) which does not vanish with unlimited number of antennas.
CLICK HERE for complete paper
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Ancient sumo-wrestling competition from the Japanese Heian or Kamakura period (between 794 and 1333)
Predicting Sports Scoring Dynamics with Restoration and Anti-Persistence
Leto Peel
ICTEAM Université catholique de Louvain, Louvain-la-Neuve, Belgium
Aaron Clauset
Department of Computer Science, University of Colorado Boulder
Abstract:
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Smart bluetooth low energy security system
Y. W. Prakash – Vishakha Biradar – Shenil Vincent – Minto Martin – Anita Jadhav
Fr. Conceicao Rodrigues Institute of Technology / Navi Mumbai
The need for security in today’s world has become a mandatory issue to look after. With the increase in a number of thefts, it has become a necessity to implement a smart security system. Due to the high cost of the existing smart security systems which use conventional Bluetooth and other wireless technologies and their relatively high energy consumption, implementing a security system with low energy consumption at a low cost has become the need of the hour. The objective of the paper is to build a cost effective and low energy consumption security system using the Bluetooth Low Energy (BLE) technology. This system will help the user to monitor and manage the security of the house even when the user is outside the house with the help of webpage. This paper presents the design and implementation of a security system using PSoC 4 BLE which can automatically lock and unlock the door when the user in the vicinity and leaving the vicinity of the door respectively by establishing a wireless connection between the physical lock and the smartphone. The system also captures an image of a person arriving at the house and transmits it wirelessly to a webpage. The system also notifies the user of any intrusion by sending a message and the image of the intruder to the webpage. The user can also access the door remotely on the go from the website.
CLICK HERE for complete paper.
New update alert! The 2022 update to the Trademark Assignment Dataset is now available online. Find 1.29 million trademark assignments, involving 2.28 million unique trademark properties issued by the USPTO between March 1952 and January 2023: https://t.co/njrDAbSpwB pic.twitter.com/GkAXrHoQ9T
— USPTO (@uspto) July 13, 2023
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