PRESS-NEWS.org - Press Release Distribution
FREE PRESS RELEASES DISTRIBUTION

Grasp of SQUIDs dynamics facilitates eavesdropping

Study presents latest theoretical advances on the dynamics of highly sensitive magnetometers

2014-04-22
(Press-News.org) Theoretical physicists are currently exploring the dynamics of a very unusual kind of device called a SQUID. This Superconducting Quantum Interference Device is a highly sensitive magnetometer used to measure extremely subtle magnetic fields. It is made of two thin regions of insulating material that separate two superconductors – referred to as Josephson junctions – placed in parallel into a ring of superconducting material. In a study published in EPJ B, US scientists have focused on finding an analytical approximation to the theoretical equations that govern the dynamics of an array of SQUIDs. This work was performed by Susan Berggren from the US Navy research lab, SPAWAR Systems Center Pacific, in San Diego, CA, USA and Antonio Palacios of San Diego State University. Its applications are mainly in the military sector, including SQUID array-based low-noise amplifiers and antennas.

Simulating the dynamics of large arrays of SQUIDs costs a great deal of time, computing power and energy. Instead the authors employed an analytical approximation technique known as a perturbation analysis to reduce the computation time to practically zero. This involves selecting small system parameters as perturbation parameters, and applying them to the array of SQUIDs to create a solution, which helps represent the dynamics of such arrays.

In this study, the authors tested two different approximations. They compared the complete analytical solution for the two approaches using the model equation forms traditionally used for the numerical simulations, then plotted both solutions to determine the effects of the approximation errors on the average voltage versus magnetic field response. In a last step, they applied the most precise approximation to a series coupled array of SQUIDs. The resulting model of the average voltage versus magnetic field response helped them evaluate the sensitivity of such magnetometers, while also shaping future applications.

INFORMATION: Reference: S. Berggren and A. Palacios (2014), Analytical Approximations to the Dynamics of an Array of Coupled DC SQUIDs, European Physical Journal B, DOI 10.1140/epjb/e2014-50065-9

For more information visit: http://www.epj.org

The full-text article is available to journalists on request.


ELSE PRESS RELEASES FROM THIS DATE:

Cloaked DNA nanodevices survive pilot mission

Cloaked DNA nanodevices survive pilot mission
2014-04-22
VIDEO: Wyss Institute Core Faculty member William Shih and Technology Development Fellow Steven Perrault explain why DNA nanodevices need protection inside the body and how a virus-inspired strategy helps protect them.... Click here for more information. It's a familiar trope in science fiction: In enemy territory, activate your cloaking device. And real-world viruses use similar tactics to make themselves invisible to the immune system. Now scientists at Harvard's Wyss Institute ...

Carnegie Mellon system lets iPad users explore data with their fingers

Carnegie Mellon system lets iPad users explore data with their fingers
2014-04-22
PITTSBURGH—Spreadsheets may have been the original killer app for personal computers, but data tables don't play to the strengths of multi-touch devices such as tablets. So researchers at Carnegie Mellon University have developed a visualization approach that allows people to explore complex data with their fingers. Called Kinetica, this proof-of-concept system for the Apple iPad converts tabular data, such as Excel spreadsheets, so that data points appear as colored spheres on the touchscreen. People can directly manipulate this data, using natural gestures to sort, ...

Child's autism risk accelerates with mother's age over 30

Childs autism risk accelerates with mothers age over 30
2014-04-22
PHILADELPHIA (April 22, 2014) – Older parents are more likely to have a child who develops an autism spectrum disorder (ASD) than are younger parents. A recent study from researchers from the Drexel University School of Public Health in Philadelphia and Karolinska Institute in Sweden provides more insight into how the risk associated with parental age varies between mothers' and fathers' ages, and found that the risk of having a child with both ASD and intellectual disability is larger for older parents. In the study, published in the February 2014 issue of the International ...

Nanomaterial outsmarts ions

Nanomaterial outsmarts ions
2014-04-22
Ions are an essential tool in chip manufacturing, but these electrically charged atoms can also be used to produce nano-sieves with homogeneously distributed pores. A particularly large number of electrons, however, must be removed from the atoms for this purpose. Such highly charged ions either lose a surprisingly large amount of energy or almost no energy at all as they pass through a membrane that measures merely one nanometer in thickness. Researchers from the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) and Vienna University of Technology (TU Wien) report in the scientific ...

Gym culture likened to McDonalds

Gym culture likened to McDonalds
2014-04-22
Visit a typical gym and you will encounter a highly standardised notion of what the human body should look like and how much it should weigh. This strictly controlled body ideal is spread across the world by large actors in the fitness industry. A new study explores how the fitness industry in many ways resembles that of fast food. One of the authors is from the University of Gothenburg. McDonaldisation of the gym culture is the theme of an article published in Sports, Education and Society, where Thomas Johansson, professor at the University of Gothenburg, together ...

Two genes linked to inflammatory bowel disease

2014-04-22
CINCINNATI—Inflammatory Bowel Disease (IBD), a group of chronic inflammatory disorders of the intestine that result in painful and debilitating complications, affects over 1.4 million people in the U.S., and while there are treatments to reduce inflammation for patients, there is no cure. Now, Cincinnati Cancer Center and University of Cincinnati (UC) Cancer Institute researcher Susan Waltz, PhD, and scientists in her lab have done what is believed to be the first direct genetic study to document the important function for the Ron receptor, a cell surface protein often ...

New design for mobile phone masts could cut carbon emissions

2014-04-22
A breakthrough in the design of signal amplifiers for mobile phone masts could deliver a massive 200MW cut in the load on UK power stations, reducing CO2 emissions by around 0.5 million tonnes a year. Funded by the Engineering and Physical Sciences Research Council (EPSRC), the Universities of Bristol and Cardiff have designed an amplifier that works at 50 per cent efficiency compared with the 30 per cent now typically achieved. Currently, a 40W transmitter in a phone mast's base station* requires just over 130W of power to amplify signals and send them wirelessly ...

Speed-reading apps may impair reading comprehension by limiting ability to backtrack

2014-04-22
To address the fact that many of us are on the go and pressed for time, app developers have devised speed-reading software that eliminates the time we supposedly waste by moving our eyes as we read. But don't throw away your books, papers, and e-readers just yet — research suggests that the eye movements we make during reading actually play a critical role in our ability to understand what we've just read. The research is published in Psychological Science, a journal of the Association for Psychological Science. "Our findings show that eye movements are a crucial part ...

UV-radiation data to help ecological research

UV-radiation data to help ecological research
2014-04-22
Many research projects study the effects of temperature and precipitation on the global distribution of plant and animal species. However, an important component of climate research, the UV-B radiation, is often neglected. The landscape ecologists from UFZ in collaboration with their colleagues from the Universities in Olomouc (Czechia), Halle and Lüneburg have processed UV-B data from the U.S. NASA space agency in such a way that they can be used to study the influence of UV-B radiation on organisms. The basic input data were provided by a NASA satellite that regularly, ...

A family of compact schemes with minimized dispersion and controllable dissipation was developed

A family of compact schemes with minimized dispersion and controllable dissipation was developed
2014-04-22
Spectral properties optimization is an important issue for developing schemes to resolve flow fields that are characterized by a wide range of length scales such as turbulent flows and aero acoustic phenomena. The work finished by Dr SUN Zhensheng and his ground provided a novel approach to optimize the dissipation and dispersion properties of a family of tri-diagonal compact schemes. The corresponding paper entitled "A high-resolution, hybrid compact-WENO scheme with minimized dispersion and controllable dissipation" was published in Sci China-Phys Mech Astron, 2014 Vol. ...

LAST 30 PRESS RELEASES:

Scientists model 'true prevalence' of COVID-19 throughout pandemic

New breakthrough to help immune systems in the fight against cancer

Through the thin-film glass, researchers spot a new liquid phase

Administering opioids to pregnant mice alters behavior and gene expression in offspring

Brain's 'memory center' needed to recognize image sequences but not single sights

Safety of second dose of mRNA COVID-19 vaccines after first-dose allergic reactions

Changes in disparities in access to care, health after Medicare eligibility

Use of high-risk medications among lonely older adults

65+ and lonely? Don't talk to your doctor about another prescription

Exosome formulation developed to deliver antibodies for choroidal neovascularization therapy

Second COVID-19 mRNA vaccine dose found safe following allergic reactions to first dose

Plant root-associated bacteria preferentially colonize their native host-plant roots

Rare inherited variants in previously unsuspected genes may confer significant risk for autism

International experts call for a unified public health response to NAFLD and NASH epidemic

International collaboration of scientists rewrite the rulebook of flowering plant genetics

Improving air quality reduces dementia risk, multiple studies suggest

Misplaced trust: When trust in science fosters pseudoscience

Two types of blood pressure meds prevent heart events equally, but side effects differ

New statement provides path to include ethnicity, ancestry, race in genomic research

Among effective antihypertensive drugs, less popular choice is slightly safer

Juicy past of favorite Okinawan fruit revealed

Anticipate a resurgence of respiratory viruses in young children

Anxiety, depression, burnout rising as college students prepare to return to campus

Goal-setting and positive parent-child relationships reduce risk of youth vaping

New research identifies cancer types with little survival improvements in adolescents and young adul

Oncotarget: Replication-stress sensitivity in breast cancer cells

Oncotarget: TERT and its binding protein: overexpression of GABPA/B in gliomas

Development of a novel technology to check body temperature with smartphone camera

The mechanics of puncture finally explained

Extreme heat, dry summers main cause of tree death in Colorado's subalpine forests

[Press-News.org] Grasp of SQUIDs dynamics facilitates eavesdropping
Study presents latest theoretical advances on the dynamics of highly sensitive magnetometers