Wireless charging, ScienceXArt Comp’n. Vicphys News 5/T2/19

Wireless charging is becoming a common technology that uses electromagnetic induction.  Searching has found a few useful articles that explore current practice and future applications.
There is also a competition linking art to the Periodic Table.

Last week’s Girls in Physics Breakfast was the largest yet, with over 160 people. The date and speaker for the Clayton Breakfast in August are announced below and bookings are now open.

The next meeting of the Vicphysics Teachers’ Network will be on Thursday, 13th June at Melbourne Girls’ College starting at 5:00pm. Teachers are welcome to these meetings. If you wish to come, please email Vicphysics

Frances Sidari (Pres), Jane Coyle (Vice-Pres), Dan O’Keeffe (Sec) and Terry Tan (Treas)

Table of Contents

  1. Wireless Charging: An application of Electromagnetic Induction
  2. Events for Students and the General Public

3. Events for Teachers

4. Physics News from the Web

  •   New definition of kilogram comes into force.
  •   More voltage from bending silicone rubber.
  •   Physics of rowing oars.
 1. Wireless Charging: An application of Electromangnetic Induction
Wireless charging, or more correctly ‘inductive charging’ is now a common technology with new mobile phones using the transformer principle, but without an iron core.  It is a technology with an increasing number of applications.  Some current areas of wireless charging research include:

  • surgical implants
  • electric vehicles
  • public transport
  • charging lane for self driving vehicles
  • solar power satellite
  • powered home appliances from a single source
  • universal power source for communications in an emergency

Some webpages with useful explanations of the technology:

Some articles with an extended discussions of the technology and applications:

2.   Events for Students and the General Public

a) 12th June. VCE Lectures: Special Relativity, 6pm, University of Melbourne
The lectures are based directly on the VCE Study Design, and presented by experts in the various areas. Arrive early at 5.30 pm for a drink and snack. The lectures will start at 6 pm and finish at 7.30 pm and will be held in the Hercus Theatre, Physics South Building.
The lecturer for this session is Dr David Simpson. He asks what is special about relativity and is it really all relative?
To register, click here .  Check here for future lectures.

b) ANSTO Big Ideas Forum,  Applications now open.
The ANSTO Big Ideas Forum brings 22 Year 10 students and 11 teachers from across Australia to Sydney to meet world-class researchers and go hands-on with amazing technology.  Applications must be for two students and one teacher.
When: Monday 11 November -Thursday 14 November, 2019
Applications opened:  Friday 31 May 2019. To apply you film a 40-second video of your two students explaining:“What problem would you like to solve through science for the future of our society?”,
This event is free – flights, travel, accommodation and meals are covered by ANSTO.
For more details click here   Applications close late August.

c) 21st June, Vivid Lives of Stars. 6:30pm, Swinburne University
PhD Student, Poojan Agrawal, will present a talk at Room AMDC301.  The abstract is not yet available.  Check here for details.

d) Science X Art: Elements in everyday life.  A periodic table themed Art Competition.  Entries close 28th June
The competition has primary, middle school and senior school categories.
Each participating school is welcome to submit their top 5 entries per competition category to the Australian Academy of Science.
The theme for the senior school category is ‘Alternative representations of the periodic table‘, with the aim of evaluating Mendeleev’s representation of the periodic table by communication of alternative methods of its representation using different principles (e.g. order by elemental abundance) or to specific audiences (eg. visually impaired).  The medium must be a diagram or a photo and supported by 150 word explanatory description. Individual or team (maximum 2 students) entries are permitted.Entries will be judged on creativity, scientific merit, and demonstration of novelty through image and description.

The closing date is 28th June, with winners announced in National Science Week.
For more details and resources, and to enter, click here.

e) 28th August: Girls in Physics Breakfast at Monash University

This is our fourth year of running Girls in Physics Breakfasts. The aims of the program are:

  • to encourage girls in Years 10 to 12 to appreciate the diversity of careers that studying physics enables,
  • to appreciate the satisfaction that comes from a challenging career in science, and
  • to be aware of the success that women can achieve in the physical sciences.

The one remaining Breakfast for this year is on 28th August at Monash University, Clayton campus, see details below.
At each breakfast, students share a table with two or three women who are either have a career in physics or engineering, or are at university as undergraduates or postgraduates.  At the table, discussion ensures about what the women do, what they like about it as well as their training, future prospects, etc.  As a student at one of  early breakfasts told her teacher, ‘I was talking to a guest at my table and her career sounded so amazing.  Then I realised that in 8 years that could be me.  I got so excited.

There is also a guest speaker at each breakfast who presents a talk on her area of expertise.  After the talk there are activities on Careers in STEM and Q & A panel with three of the guests.

The date, venue, speaker, topic and Trybooking link is:

  • 28th August, Clayton Speaker: Dr Helen Maynard-Casely, ANSTO. Topic: How neutrons can save the world. Closing date: 4:00pm, 19th August.  Trybookings.

Further details: For promotional flyer and more details on the talk, etc, go to our website.
Numbers:  There is an initial maximum of  6 students per school, to ensure that more schools that can participate. On 8th August, any remaining spots will be opened up to schools that have already booked.
Cost: $15 per student with teachers free, a discounted fee is available to schools with a low ICSEA rank.
See the specific Trybookings link for details.

3.  Events for Teachers
a) Physics in the Pub, 6:30pm, 20th June, Hawthorn

Physics in the Pub is an informal, light-hearted night where physicists, astronomers, theoreticians, engineers and educators share their love of science.

When: 6.30 PM Thursday June 20
Where: Beer Deluxe Hawthorn
Sponsored by the AIP, and the following Centres of Excellence CNBP, OzGrav, FLEET and Exciton Science.

The MC is Dr Phil Dooley, science writer.
You are also invited to get involved, if you wish. You have eight minutes to entertain the audience with stand up, a poem, a song or just a damn-good science talk.  Email philuponscience@gmail.comif you want to be involved.

* Acts are limited to strictly eight minutes.
* There are limited slots available on the night with as many participants as possible; final selection will be based on showcasing a range of performers and experience.
* Available resources at the venue: powerpoint, screen, PC/Mac with sound, microphone, PA sound system, dimmable lights
* Participants will need to inform Phil of their requirements for AV/powerpoint etc before the night, and send videos/presentations for testing at least 24 hrs before the event.
* There will be limited help available for set-up and pack-up, so for heavy or complicated equipment, please BYO roadies.
* Participants must ensure that the stage is clean and tidy for the next participant.

b) ANSTO PD Day, Weds, 2nd October, Australian Synchrotron
ANSTO is offering a PD at the Australian Synchrotron  The program will look at a number of syllabus-focused educational resources to teach areas of the Year 9 Science curriculum and Year 12 Physics. You will also hear from prominent scientists and have a tour of the Australian Synchrotron.
Cost: $55, Lunch is not provided.
To book, click here.

4.   Physics from the Web
Items selected from the bulletins of the Institute of Physics (UK) and American Physical Society (APS).
Each item below includes the introductory paragraphs and a web link to the rest of the article.

New definition of the kilogram comes into force
The redefinition of four units of the International System of Units (SI) will come into effect on Monday 20 May meaning that all seven base units are now based on fundamental physical constants. The kilogram, the ampere, the kelvin and the mole are now defined in terms of physical constants rather than an object or phenomenon. The decision to redefine of the four SI base unitswas taken in November 2018 when metrologists and policy-makers from 60 countries around the world met at the General Conference on Weights and Measures in Versailles, France. The change will now become a reality on 20 May to mark World Metrology Day.

There are seven base units of the SI: the second, metre, kilogram, ampere, kelvin, mole and candela.  Some have long been based on physical constants. The second, for example, is set as 9,192,631,770 times the period of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom. The metre, meanwhile, has been defined since 1983 as the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 seconds.

More Voltage from Bending Silicone Rubber
Flexoelectric materials generate a voltage when bent, a property that could be useful in engineering delicate sensors or energy harvesting devices, such as clothes that would produce electricity when a person walks. Researchers have now shown that adding a layer of charge to the middle of a flexible polymer bar can boost the effect by 100 times. The team says that with further development, the effect could be used in real devices within five years.

Physics of rowing oars
Abstract. In each rowing sport, the oars have their very own characteristics most of the time selected through a long time experience. Here we address experimentally and theoretically the problem of rowing efficiency as function of row lengths and blade sizes.  In contrast with previous studies which consider imposed kinematics, we set an imposed force framework which is closer to human constraints. We find that optimal row lengths and blade sizes depend on sports and athlete’s strength, and we provide an optimisation scheme.




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