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Published on: February 1, 2018
Early Experience with Electric Scooter Injuries Requiring Neurosurgical Evaluation in District of Columbia: A Case
Cody D Schlaff1, Kenneth D Sack1, Ross-Jordon Elliott1
1The George Washington University School of Medicine and Health Sciences, The George Washington University Hospital, Washington, DC, USA; Department of Neurological Surgery, The George Washington University Hospital, Washington, DC, USA.
Background:
To decrease vehicular traffic in major metropolitan cities throughout the United States, multiple ridesharing companies have launched dockless electric scooters and bicycles throughout cities. From September 2017 through November 2018, Washington, DC, launched a 15-month dockless vehicle pilot program to allow for the rapid entry and growth of electric scooters within the metropolitan area. This rapid growth resulted in a number of minor and significant injuries.
Case Description:
We reviewed the electronic medical record of The George Washington University Hospital to investigate and characterize the types of electric scooter-related injuries resulting in neurosurgical consultation in the 15-month period of the Washington, DC, scooter pilot program. Thirteen patients sustained injuries serious enough to merit neurosurgical consultation, including 1 patient whose symptoms required procedural intervention by a neurointerventional radiologist and another patient who was pronounced dead soon after arrival to the hospital.
Conclusions:
In this case series, we highlight more severe injuries that resulted in hospitalization or intervention, including skull fracture, central cord syndrome, and vertebral compression fracture. This case series aims to illustrate the potential severity of injuries related to electric scooters, raise awareness on the issues of safety and public health, and call for further investigation into injuries relating to electric scooters.
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Series and Parallel Resistors
This experiment demonstrates how current is distributed in resistors connected in series or parallel, and thus describes how to calculate the total "effective" resistance. Using Ohm's law, it possible to convert between the voltage and current through a resistance, if the resistance is known.
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Balmer Series
Balmer Series
Niels Bohr proposed a model for the hydrogen atom in 1913 that described discrete energy states are associated with a fixed electron orbit around the nucleus. Importantly, an atom cannot discharge energy while its electrons are in stationary states. An electron can only emit energy by changing energy states. To change energy states, an electron must move from one orbit to another by either absorbing or emitting energy. This change can only occur if the absorbed or emitted energy...

