 reduces the trigger rate. Those current taking formal refrigeration classes will have to learn the regulations before they can receive their certification and work on such appliances. Other issues address include how soon leaks need to be repaired after they are discovered, when additional time is necessary to repair leaks, and what to do when deciding to retrofit or retire an appliance that leaks above the trigger rate. 2
Recordkeeping Laws
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Section 608 requires HVAC professionals to keep records of their work with refrigerants. First, they must keep a copy of their certification at their place of business. Also, HVAC technicians who service any appliance with 50 pounds or more of ozone depleting refrigerant, must give the owner documentation stating the amount of refrigerant added to the appliance. This will also apply to HFC and other non-exempt refrigerants in 2019. Regulations set to take effect in 2018, will require technicians to keep records of any appliance they dispose containing between 5 and 50 pounds of refrigeration. 3
Staying Informed of Laws and Regulations
The learning doesn’t just end once an HVAC tech finishes vocational training. It’s important to stay informed about changes to laws and regulations. As the EPA continues to make advances for environmental health, HVAC techs might have to embrace new processes and safer products in their line of work.
Additional Sources:
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3 –Explore our research, which influenced the design and development of the Versus system.
The Versus system was imagined, designed, and created by a team of experts in neuroscience, psychology, neurofeedback, and more. Included here are research papers and case studies written by members of our team and our affiliates.
The scientific principles discussed in these papers were considered during the design of Versus. However, Versus is not a registered neurofeedback device and is not intended to diagnose, treat, cure, or prevent any disease or disorder. You should always seek the advice of your physician or other qualified health provider on any questions you may have regarding a medical condition.
Groundbreaking findings: The EEG data recorded from Versus is comparable to that recorded by a conventional wet EEG system.
Scientists are gaming the system. They are using brain training games and neurofeedback to improve cognitive health.
Discover innovative and accessible tools being used to assess and address attentional issues from the classroom to the boardroom.
Could 8 hours a day keep the doctor away? Learn about the health benefits of sleep and the mobile platforms designed to help.
Read how a combination of EEG, psychology, and nutrition helped Red Bull’s high performing athletes reach new heights.
So much stress, so little time? Explore different interventions that may help you effectively cope with and respond to daily stressors.
By training his mind in conjunction with his body, a professional boxer enhanced his physical health and his mental performance.
Carlos Quentin’s Performance Brain Training regimen was a home run. It helped improve his ability to focus and recover from the demands of competition.
As Kerri Walsh Jennings prepared to go for the gold at the London Olympics, she used a prototype of the Versus technology to recover from stress and stay engaged.
In this study, researchers examine the effectiveness of neurofeedback sessions on the at bat and at home performance of Major League Baseball players.
Performance Brain Training helped UCLA’s golf team get and stay on course, with participants showing major improvements in their game.Corinne Sarkies
Corinne B. Sarkies (nee Newquist) was born April 13, 1914 and died December 31, 2005. She is survived by her three children, Jeffrey, Todd (Ilene) and Carol, and her three grandchildren, Jason, Tessa and Daneka Sarkies. One brother, Donald Newquist (Edith), also survives, as well as other members of the extended family. We are grateful to the many people who extended kindness to our mother during her final illness as well. Thank you to her friends at Brittany Park who helped her find a new community that gave her great joy in the last years of her life. Thank you also to Bob and Jeanne Sarkies for your love and support.
A vigil was celebrated on January 4 and the Mass of Christian Burial was on January 5, both at Holy Rosary Church. Burial followed at Holyrood Cemetery.
Memorials may be made to Our Faith, Our Future capital campaign at Holy Rosary.
Arrangements were entrusted to the Howden-Kennedy Funeral Home of West Seattle.The links between hearing impairment (HI) and dementia have been well documented, but factors mediating this relationship remain unknown. Major consequences of HI are social and emotional dysfunction, and as the risk of dementia increases linearly with the severity of HI, it is plausible that socio-emotional difficulties may play a role in this association.
The aim of this study was to develop and validate a tool to analyse levels of hearing-related disability, to investigate ultimately whether subjective disability contributes to risk of cognitive impairment compared with hearing thresholds alone.
Development and validation of the questionnaire, the Social and Emotional Impact of Hearing Impairment (SEI-HI), was conducted in four phases: (1) content; (2) scoring and outcomes; (3) validation; (4) feasibility in a sample of people with cognitive impairment.
Considerable evidence was found for the internal and external reliability of the tool with high construct validity, concurrent validity and test-retest values of the SEI-HI questionnaire. A feasibility check on 31 patients with mild cognitive impairment or dementia showed the SEI-HI questionnaire was easy to administer and well-received.
The SEI-HI questionnaire is a relevant instrument to assess hearing-related disability which can be used in people with cognitive decline to assess further impact on risk of developing dementia.
Manj is one of the UK’s foremost speaker coaches and conference consultants.
He can coach an individual or a team in mastering the art and science of public speaking and presenting. You will learn how to replace any fear with certainty and confidence; how to connect with any size of audience quickly and how to hold their attention whatever the subject matter. He can show you how to speak and move with purpose and to utilise non-verbal communication to achieve specific outcomes every time.
Once you understand the three variables within speaking and communicating, you and your presentation skills make a quantum leap in performance.Tag Info

The classical theory of electric and magnetic fields, both in the static and dynamic case. Also covers general questions about magnets, electric attraction/repulsion etc. Distinct from electrical-engineering.

## When to Use this Tag

covers the classical description of both static and dynamic electromagnetic phenomena, summarised in Maxwell’s equations. For the discussion of electric circuitry, use instead, while should be used for the (non-classical) QFT approach to electromagnetism. The classical counterpart, is typically used, as an alternative to, to emphasise that the question focuses on the dynamical aspects of electric and magnetic phenomena, as opposed to and.

## Introduction

Maxwell's theory provide a classical description of the phenomena arising from static and moving electric charges, either macroscopic or microscopic (such as the electron). The relevant quantities are the electric field $\vec E$ and the magnetic field $\vec B$, which obey (cf. below).

The distinction between electrostatics and electrodynamics is helpful for the following reason: in the static cases, charges effecting an electric field are assumed to be stationary, and currents causing a magnetic field do not change magnitude or direction; thus simplifying the analysis of the equations of motion. The dynamical case allows for both of these to happen, leading to a much richer phenomenology, which includes electromagnetic waves and time-dependent magnetic and electric fields.

## Maxwell's equations

An electric charge is often denoted by $q$ and an electric current by $I$. These objects can be written as the integrals of the densities $\rho,\vec j$, known as the charge and current densities. These densities act as sources for the electric field $\vec E$ and the magnetic field $\vec B$, as described by Maxwell's equations: $$\nabla\cdot\vec E=4\pi\rho$$$$\nabla\cdot\vec B=0$$$$\nabla\times\vec E=-\frac{1}{c}\frac{\partial\vec B}{\partial t}$$$$\nabla\times\vec B=\frac{1}{c}\left(4\pi\vec j+\frac{\partial\vec E}{\partial t}\right)$$

These equations, together with some appropriate boundary conditions, determine the value of the electric and magnetic fields uniquely. The solutions typically exhibit radiation phenomena, in the form of electromagnetic waves, cf.. This phenomenon is the origin of, for example,, and is the fundamental principle behind.

For more details, see,,, and.

## Manifest covariance

The electric and magnetic fields can be combined into a single object, known as the field strength tensor, which is a rank-2 anti-symmetric tensor $F^{\mu\nu}$, with components $$F^{0i}=\frac1cE^i,\qquad F^{ij}=-\epsilon^{ijk}B^k$$

This tensor allows us to recast Maxwell's equations in a manifestly covariant form. To this end, we introduce the so-called four-current, with components $j^\mu=(c\rho,\vec j)$. Using this notation, Maxwell's equation can be written as $$\partial_\mu F^{\mu\nu}=j^\nu,\qquad \partial