Coyle, M; Fortin, R. Geological Survey of Canada, Open File 9053, 2023, 1 sheet, https://doi.org/10.4095/332249
<a href="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332249.jpg"><img src="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332249.jpg" title="Geological Survey of Canada, Open File 9053, 2023, 1 sheet, https://doi.org/10.4095/332249" height="150" border="1" /></a>

Coyle, M; Fortin, R. Geological Survey of Canada, Open File 9052, 2023, 1 sheet, https://doi.org/10.4095/332248
<a href="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332248.jpg"><img src="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332248.jpg" title="Geological Survey of Canada, Open File 9052, 2023, 1 sheet, https://doi.org/10.4095/332248" height="150" border="1" /></a>

Coyle, M; Fortin, R. Geological Survey of Canada, Open File 9043, 2023, 1 sheet, https://doi.org/10.4095/332239
<a href="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332239.jpg"><img src="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332239.jpg" title="Geological Survey of Canada, Open File 9043, 2023, 1 sheet, https://doi.org/10.4095/332239" height="150" border="1" /></a>

Coyle, M; Fortin, R. Geological Survey of Canada, Open File 9042, 2023, 1 sheet, https://doi.org/10.4095/332238
<a href="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332238.jpg"><img src="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332238.jpg" title="Geological Survey of Canada, Open File 9042, 2023, 1 sheet, https://doi.org/10.4095/332238" height="150" border="1" /></a>

Coyle, M; Fortin, R. Geological Survey of Canada, Open File 9033, 2023, 1 sheet, https://doi.org/10.4095/332229
<a href="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332229.jpg"><img src="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332229.jpg" title="Geological Survey of Canada, Open File 9033, 2023, 1 sheet, https://doi.org/10.4095/332229" height="150" border="1" /></a>

Coyle, M; Fortin, R. Geological Survey of Canada, Open File 9032, 2023, 1 sheet, https://doi.org/10.4095/332228
<a href="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332228.jpg"><img src="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332228.jpg" title="Geological Survey of Canada, Open File 9032, 2023, 1 sheet, https://doi.org/10.4095/332228" height="150" border="1" /></a>

Coyle, M; Fortin, R. Geological Survey of Canada, Open File 9023, 2023, 1 sheet, https://doi.org/10.4095/332219
<a href="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332219.jpg"><img src="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332219.jpg" title="Geological Survey of Canada, Open File 9023, 2023, 1 sheet, https://doi.org/10.4095/332219" height="150" border="1" /></a>

Coyle, M; Fortin, R. Geological Survey of Canada, Open File 9022, 2023, 1 sheet, https://doi.org/10.4095/332218
<a href="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332218.jpg"><img src="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332218.jpg" title="Geological Survey of Canada, Open File 9022, 2023, 1 sheet, https://doi.org/10.4095/332218" height="150" border="1" /></a>

Coyle, M; Fortin, R. Geological Survey of Canada, Open File 9013, 2023, 1 sheet, https://doi.org/10.4095/332209
<a href="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332209.jpg"><img src="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332209.jpg" title="Geological Survey of Canada, Open File 9013, 2023, 1 sheet, https://doi.org/10.4095/332209" height="150" border="1" /></a>

Coyle, M; Fortin, R. Geological Survey of Canada, Open File 9012, 2023, 1 sheet, https://doi.org/10.4095/332208
<a href="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332208.jpg"><img src="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332208.jpg" title="Geological Survey of Canada, Open File 9012, 2023, 1 sheet, https://doi.org/10.4095/332208" height="150" border="1" /></a>

Coyle, M; Fortin, R. Geological Survey of Canada, Open File 9003, 2023, 1 sheet, https://doi.org/10.4095/332199
<a href="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332199.jpg"><img src="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332199.jpg" title="Geological Survey of Canada, Open File 9003, 2023, 1 sheet, https://doi.org/10.4095/332199" height="150" border="1" /></a>

Coyle, M; Fortin, R. Geological Survey of Canada, Open File 9002, 2023, 1 sheet, https://doi.org/10.4095/332198
<a href="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332198.jpg"><img src="https://geoscan.nrcan.gc.ca/images/geoscan/gid_332198.jpg" title="Geological Survey of Canada, Open File 9002, 2023, 1 sheet, https://doi.org/10.4095/332198" height="150" border="1" /></a>

BGS leads update to maps of the Earth’s magnetic field  British Geological Survey

Superconducting undulators (SCUs) can offer a much higher on-axis undulator field than state-of-the-art cryogenic permanent-magnet undulators with the same period and vacuum gap. The development of shorter-period and high-field SCUs would allow the free-electron laser and synchrotron radiation source community to reduce both the length of undulators and the dimensions of the accelerator. Magnetic measurements are essential for characterizing the magnetic field quality of undulators for operation in a modern light source. Hall probe scanning is so far the most mature technique for local field characterization of undulators. This article focuses on the systematic error caused by thermal contraction that influences Hall probe measurements carried out in a liquid helium cryostat. A novel procedure, based on the redundant measurement of the magnetic field using multiple Hall probes at known relative distance, is introduced for the correction of such systematic error.

The orientation ordering and assembly behavior of silica–nickel Janus particles in a static external magnetic field were probed by ultra small-angle X-ray scattering (USAXS). Even in a weak applied field, the net magnetic moments of the individual particles aligned in the direction of the field, as indicated by the anisotropy in the recorded USAXS patterns. X-ray photon correlation spectroscopy (XPCS) measurements on these suspensions revealed that the corresponding particle dynamics are primarily Brownian diffusion [Zinn, Sharpnack & Narayanan (2023). Soft Matter, 19, 2311–2318]. At higher fields, the magnetic forces led to chain-like configurations of particles, as indicated by an additional feature in the USAXS pattern. A theoretical framework is provided for the quantitative interpretation of the observed anisotropic scattering diagrams and the corresponding degree of orientation. No anisotropy was detected when the magnetic field was applied along the beam direction, which is also replicated by the model. The method presented here could be useful for the interpretation of oriented scattering patterns from a wide variety of particulate systems. The combination of USAXS and XPCS is a powerful approach for investigating asymmetric colloidal particles in external fields.

The Australian Synchrotron Imaging and Medical Beamline (IMBL) uses a superconducting multipole wiggler (SCMPW) source, dual crystal Laue monochromator and 135 m propagation distance to enable imaging and computed tomography (CT) studies of large samples with mono-energetic radiation. This study aimed to quantify two methods for CT dose reduction: wiggler source operation at reduced magnetic field strength, and beam modulation with spatial filters placed upstream from the sample. Transmission measurements with copper were used to indirectly quantify the influence of third harmonic radiation. Operation at lower wiggler magnetic field strength reduces dose rates by an order of magnitude, and suppresses the influence of harmonic radiation, which is of significance near 30 keV. Beam shaping filters modulate the incident beam profile for near constant transmitted signal, and offer protection to radio-sensitive surface organs: the eye lens, thyroid and female breast. Their effect is to reduce the peripheral dose and the dose to the scanned volume by about 10% for biological samples of 35–50 mm diameter and by 20–30% for samples of up to 160 mm diameter. CT dosimetry results are presented as in-air measurements that are specific to the IMBL, and as ratios to in-air measurements that may be applied to other beamlines. As CT dose calculators for small animals are yet to be developed, results presented here and in a previous study may be used to estimate absorbed dose to organs near the surface and the isocentre.

Full Text:

Earth's magnetic field seems steady and true -- reliable enough to navigate by. Yet, largely hidden from daily life, the field drifts, waxes and wanes. The magnetic North Pole is currently shifting toward Siberia, forcing the Global Positioning System that underlies modern navigation to update its software sooner than expected. Every several hundred thousand years, the magnetic field dramatically shifts and reverses its polarity. Magnetic north flips to the geographic South Pole and, eventually, back again. This reversal has happened countless times over Earth's history, but scientists' understanding of why and how the field reverses is limited. The researchers find that the most recent field reversal 770,000 years ago took at least 22,000 years to complete, several times longer than previously thought. The results call into question controversial findings that some reversals could occur within a human lifetime.

Image credit: Brad Singer

ITU-T K.91 - Guide on electromagnetic fields and health

Radiofrequency electromagnetic field (RF-EMF) exposure levels from mobile and portable devices during different conditions of use

Guidance for assessment, evaluation and monitoring of human exposure to radio frequency electromagnetic fields

Monitoring of electromagnetic field levels

Electromagnetic field compliance assessments for 5G wireless networks

Electromagnetic field strength inside and outside of electric vehicles using wireless power transfer technology

Electromagnetic field compliance assessments for 5G wireless networks

Case studies of radio frequency- electromagnetic field (RF-EMF) assessment

Case studies of radio frequency- electromagnetic field (RF-EMF) assessment

Guidance for assessment, evaluation and monitoring of human exposure to radio frequency electromagnetic fields

Monitoring of electromagnetic field levels

Resolution 72 - (Rev. Geneva, 2022) - Measurement concerns related to human exposure to electromagnetic fields

Monitoring of electromagnetic field levels in Latin America

See someone? Say something! by Anonymous

good boy, Mitten Bakery ????

"Who's a good boy?" you petting your cute dog next to me. I asked "Oh me?". You said, "Well if I get two good boys out of it ya!" - I didn't get ur #!

Smokin Hot at Smoker Dad

I Saw U at the Sunset Tavern at the Smoker Dad release show. You were wearing a tight jean skirt, and you told me I had a timeless beauty. Same, girl.

Barrettes at Hop Vine 10.28

I stared, we waved! I looked up how to sign “ur super cute” but was too shy. I like your hair, sweater, how you cover your mouth when you laugh!

I saw u x2 @ SBP

UW & Fremont. You were tall & brunette w glasses. I’m shortish and brunette w glasses. You seemed interested, I’m shy. But I’m interested too

Party at Porter

We were both on the floor at the Porter Robinson show. You were in front of me, tall and blonde. Thanks for making an incredible show even more fun.

Bus 49 Connection

Tall guy in tan sweater, wearing a black mask, purple-haired girl hoping to meet again. We made eye contact a few times in cap hill and I was too shy to look at you. Kinda felt like I was in a kdrama—wanna be my Lee Min Ho?

Dieu en Mouvement

BV Lincoln SQ: 3:30, Sunday. You were exiting. Tall, dark, a beautiful print coat, thin glasses, I said I liked your outfit. You are art in motion.

Fellow Magnetic Fields Fans

We sat in the balcony turret the first night of 69 Love Songs. Thanks for singing along with me! Hope you got to come back for Papa was a Rodeo.

Is it a match? Leave a comment here or on our Instagram post to connect!

Did you see someone? Say something! Submit your own I Saw U message here and maybe we'll include it in the next roundup!

Transcranial magnetic stimulation sounds like — and looks like — something you'd find in a science fiction movie, but it's a real treatment option…

Eurasian reed warblers don’t just get a sense of direction from Earth’s magnetic field – they can also calculate their coordinates on a mental map

Researchers have used quantum light to create a magnetic field with a strength that is measured in imaginary numbers

Eurasian reed warblers don’t just get a sense of direction from Earth’s magnetic field – they can also calculate their coordinates on a mental map

Eurasian reed warblers don’t just get a sense of direction from Earth’s magnetic field – they can also calculate their coordinates on a mental map

A 200-km drive from Jaipur, Alsisar Mahal hosted a three-day music festival after two years in December

A fact sheet about research on electric and magnetic fields and studies examining their potential connection with cancer.

Spin-state effect could lead to new way to run chiral separations on racemic mixtures

Meta-magnetic shape-memory alloys combine ferroelastic order with ferromagnetic order and exhibit attractive multifunctional properties, but they are extremely brittle, showing hardly any tensile deformability, which impedes their practical application. Here, for the first time, an Ni–Cu–Co–Mn–In microwire has been developed that simultaneously exhibits a magnetic field-induced first-order meta-magnetic phase transition and huge tensile superelasticity. A temperature-dependent in situ synchrotron high-energy X-ray diffraction investigation reveals that the martensite of this Ni43.7Cu1.5Co5.1Mn36.7In13 microwire shows a monoclinic six-layered modulated structure and the austenite shows a cubic structure. This microwire exhibits an oligocrystalline structure with bamboo grains, which remarkably reduces the strain incompatibility during deformation and martensitic transformation. As a result, huge tensile superelasticity with a recoverable strain of 13% is achieved in the microwire. This huge tensile superelasticity is in agreement with our theoretical calculations based on the crystal structure and lattice correspondence of austenite and martensite and the crystallographic orientation of the grains. Owing to the large magnetization difference between austenite and martensite, a pronounced magnetic field-induced magnetostructural transition is achieved in the microwire, which could give rise to a variety of magnetically driven functional properties. For example, a large magnetocaloric effect with an isothermal entropy change of 12.7 J kg−1 K−1 (under 5 T) is obtained. The realization of magnetic-field- and tensile-stress-induced structural transformations in the microwire may pave the way for exploiting the multifunctional properties under the coupling of magnetic field and stress for applications in miniature multifunctional devices.

Stars form when gravity pulls together material within giant clouds of gas and dust. But gravity isn’t the only force at work. Both turbulence and […]

The post As Stars Form, Magnetic Fields Influence Regions Big and Small appeared first on Smithsonian Insider.

Most people think of black holes as giant vacuum cleaners sucking in everything that gets too close. But the supermassive black holes at the centers […]

The post Event Horizon Telescope Reveals Magnetic Fields at Milky Way’s Central Black Hole appeared first on Smithsonian Insider.

Using new numerical simulations and observations, scientists may now be able to explain why the Sun’s magnetic field reverses every eleven years. This significant discovery […]

The post 3D simulations reveals why the Sun flips its magnetic field every 11 years appeared first on Smithsonian Insider.