Results 91 to 100 of about 444,397 (341)

Impact of cosmic rays and solar energetic particles on the Earth’s ionosphere and atmosphere

Journal of Space Weather and Space Climate, 2013
A brief review of the study during COST Action ES0803 of effects due to cosmic rays (CR) and solar energetic particles (SEP) in the ionosphere and atmosphere is presented.
Mateev Lachezar, Lastovicka Jan, Kudela Karel, Asenovski Simeon, Velinov Peter I.Y., Mishev Alexander, Tonev Peter   +6 more
doaj   +1 more source

Sensing Properties of a Novel Temperature Sensor Based on Field Assisted Thermal Emission

Sensors, 2017
The existing temperature sensors using carbon nanotubes (CNTs) are limited by low sensitivity, complicated processes, or dependence on microscopy to observe the experimental results.
Zhigang Pan, Yong Zhang, Zhenzhen Cheng, Jiaming Tong, Qiyu Chen, Jianpeng Zhang, Jiaxiang Zhang, Xin Li, Yunjia Li   +8 more
doaj   +1 more source

Terahertz and higher-order Brunel harmonics: from tunnel to multiphoton ionization regime in tailored fields [PDF]

, 2017
Brunel radiation appears as a result of a two-step process of photo-ionization and subsequent acceleration of electron, without the need of electron recollision. We show that for generation of Brunel harmonics at all frequencies the subcycle ionization dynamics is of critical importance. Namely, such harmonics disappear at low pump intensities when the
arxiv   +1 more source

Calculation of the triple and double cross sections in the proton-hydrogen impact at the ionization channel by removing singularity in the scattering amplitudes

Iranian Journal of Physics Research, 2019
In the present work, the triple and double cross sections of atomic hydrogen ionization in collision with the proton are  calculated. The potential of the interaction is considered as a Coulombic;  also,  the first and second order Born approximations ...
S Amiri, R Fathi, B Chaboki
doaj  

Routine machine quality assurance tests for a self‐shielded gyroscopic radiosurgery system

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Purpose This report describes routine machine quality assurance (QA) (daily, monthly, and annual QA) tests for the Zap‐X® Gyroscopic Radiosurgery® platform. Methods Following the recommendations of the American Association of Physicists in Medicine Task Group (AAPM TG)‐142 and Medical Physics Practice guideline (MPPG) 8.b, routine machine QA ...
Yongsook C. Lee, Ranjini Tolakanahalli, D Jay Wieczorek, Minesh P. Mehta, Michael W. McDermott, Rupesh Kotecha, Alonso N. Gutierrez   +6 more
wiley   +1 more source

The physical chemistry of the enigmatic phospholipid diacylglycerolpyrophosphate

Frontiers in Plant Science, 2012
Phosphatidic acid (PA) is a lipid second messenger that is formed transiently in plants in response to different stress conditions, and plays a role in recruiting protein targets, ultimately enabling an adequate response.
Liza eStrawn, Amy eBabb, Christa eTesterink, Edgar Eduard Kooijman   +3 more
doaj   +1 more source

Hypoxia‐guided treatment planning for lung cancer with dose painting by numbers

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Tumor hypoxia significantly impacts the efficacy of radiotherapy. Recent developments in the technique of dose painting by numbers (DPBN) promise to improve the tumor control probability (TCP) in conventional radiotherapy for hypoxic cancer.
Yazhou Li, Yuanyuan Ma, Jieyan Wu, Hui Zhang, Hongyi Cai, Xinguo Liu, Qiang Li   +6 more
wiley   +1 more source

Revisiting the tunnelling site of electrons in strong field enhanced ionization of molecules [PDF]

, 2014
We investigated electron emissions in strong field enhanced ionization of asymmetric diatomic molecules by quantum calculations. It is demonstrated that the widely-used intuitive physical pic- ture, i.e., electron wave packet direct ionization from the up-field site (DIU), is incomplete.
arxiv   +1 more source

High spatial resolution dosimetry for radiation oncology with “MagicPlates,” a new 976‐pixel monolithic silicon detector

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Purpose We introduce the next generation of “MagicPlate” 2D monolithic pixelated semiconductor detectors – MagicPlate‐976 (MP976). It features a larger array area, higher spatial resolution, and does not require external triggering. We perform a comprehensive characterization for small‐field steep‐dose‐gradient dosimetry applications in ...
Ilia Filipev, Saree Alnaghy, Martin Carolan, Jason Paino, Marco Petasecca, Dean Cutajar, Joel Poder, Justin B. Davies, Bradley M. Oborn, Nicholas Hardcastle, Susanna Guatelli, Michael Lerch, Tomas Kron, Anatoly Rosenfeld   +13 more
wiley   +1 more source

Expert panel on monitoring radiation doses from recurrent medical diagnostic procedures: Sixth Gilbert W. Beebe Webinar

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Recurrent imaging is an essential tool for patient care but with an attendant dose from radiation exposure. Recurrent imaging has been the subject of increasing scrutiny and debate based largely on the risk from increasing cumulative doses. However, the accountability for and actions with recurrent imaging as a special component in the general
Donald P. Frush, Armin Ansari, James A. Brink, Ourania Kosti, David B. Larson, Martha S. Linet, Mahadevappa Mahesh, Ioannis Sechopoulos, Jenia Vassileva   +8 more
wiley   +1 more source