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Nowadays, X-ray sources are advanced tools used to probe the properties of matter and dynamic systems. Large scale accelerator based light source facilities have been constructed around the Globe to meet the scientific, technological and societal needs. Development of compact pocket-style X-ray systems meeting safety regulations is a complementary task requiring stable, reliable, and reproducible sources of X-rays with controllable parameters. In this research we employed a new approach for pyroelectric accelerator operation. Periodically varying temperature of LiTaO crystal enabled us to generate stable quasi-continuous X-ray beam. We managed to observe and characterise the avalanche process at pyroelectric effect. This phenomenon is responsible for multiplication of electrons at the anode while producing X-rays. We have demonstrated the great potential of this compact X-ray source by performing reliable energy-dispersive X-ray spectroscopy for element analysis of two solid samples.
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http://dx.doi.org/10.1038/s41598-025-15436-4 | DOI Listing |
Sci Rep
August 2025
Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany.
Nowadays, X-ray sources are advanced tools used to probe the properties of matter and dynamic systems. Large scale accelerator based light source facilities have been constructed around the Globe to meet the scientific, technological and societal needs. Development of compact pocket-style X-ray systems meeting safety regulations is a complementary task requiring stable, reliable, and reproducible sources of X-rays with controllable parameters.
View Article and Find Full Text PDFMedicine (Baltimore)
January 2025
Department of Neurology, Haiyan People's Hospital Jiaxing, Zhejiang, China.
This study aimed to evaluate changes in cerebral blood flow and perioperative outcomes in patients with unilateral symptomatic carotid artery stenosis before and after carotid artery stenting (CAS), providing insights to guide surgical decision-making. Ninety-six patients with moderate to severe unilateral symptomatic carotid artery stenosis (>50%) admitted to the Neurology Department of the Second Affiliated Hospital of Zhejiang University from June 2023 to April 2024 were included. All patients underwent CAS and magnetic resonance imaging, including diffusion-weighted imaging (DWI) and 3D quasi-continuous arterial spin-labeled perfusion imaging, within 3 days preoperatively and on the third postoperative day.
View Article and Find Full Text PDFPhys Med Biol
January 2025
Department of Medical Physics and Biomedical Engineering, University College London, London WC1E 6BT, United Kingdom.
Transcranial ultrasound is used in a variety of treatments, including neuromodulation, opening the blood-brain barrier, and high intensity focused ultrasound therapies. To ensure safety and efficacy of these treatments, numerical simulations of the ultrasound field within the brain are used for treatment planning and evaluation. This study investigates the accuracy of numerical modelling of the propagation of focused ultrasound through cranial bones.
View Article and Find Full Text PDFLasers Med Sci
June 2024
Laboratory for Laser Aided Additive and Subtractive Manufacturing, Department of Materials Science and Engineering, University of North Texas, 1155 Union Circle-305310, Denton, TX, 76203-5017, USA.
Frequently orthopedic surgeries require mechanical drilling processes especially for inserted biodegradable screws or removing small bone lesions. However mechanical drilling techniques induce large number of forces as well as have substantially lower material removal rates resulting in prolong healing times. This study focuses on analyzing the impact of quasi-continuous laser drilling on the bone's surface as well as optimizing the drilling conditions to achieve high material removal rates.
View Article and Find Full Text PDFLangmuir
January 2024
Department of Chemistry and Biochemistry and Laboratory for Surface Studies, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, United States.
This paper describes a method by which surface-reaction kinetics can be measured by slowly and precisely ramping up the surface temperature at a constant rate while simultaneously collecting X-ray photoelectron spectra (XPS). This approach results in the collection of a large amount of data over relatively small temperature steps to produce quasi-continuous kinetic data. The method is illustrated for the desorption and reaction of diethyl disulfide (DEDS) on a Au(111) substrate in ultrahigh vacuum, where the results can be compared with previous conventional temperature-programmed desorption (TPD) data from Au(111).
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