-
3741
Optimization of Carbon Ion Treatment Plans by Integrating Tissue Specific α/β-Values for Patients with Non-Resectable Pancreatic Cancer.
Published 2016-01-01“…By the use of the treatment planning system Syngo RT Planning (Siemens, Erlangen, Germany) treatment plans with carbon ion beams have been created. Dose calculation was based on [Formula: see text]-values for both organs at risk (OAR) and the tumor. …”
Get full text
Article -
3742
On the occurrence and characteristics of intense low-altitude electric fields observed by Freja
Published 1995-07-01“…In contrast to the observations within the auroral acceleration region characterized by intense converging electric fields associated with electron precipitation, upward ion beams and upward field-aligned currents, the intense electric fields observed by Freja are often found to be diverging and located within regions of downward field-aligned currents outside the electron aurora. …”
Get full text
Article -
3743
Massively parallel direct writing of nanoapertures using multi-optical probes and super-resolution near-fields
Published 2022-09-01“…However, conventional methods are limited by low throughput and scalability, and tend to use electron beams or focused-ion beams to create nanostructures. In this study, we developed a procedure for massively parallel direct writing of nanoapertures using a multi-optical probe system and super-resolution near-fields. …”
Get full text
Article -
3744
On the occurrence and characteristics of intense low-altitude electric fields observed by Freja
Get full text
Article -
3745
Conceptual model of IMSIC-250 cyclotron magnet
Published 2022-11-01“…Proton therapy with accelerator systems has been used in the last 30 years to destroy tumors by producing highly energetic ion beams. Although different systems have been introduced and designed to accelerate ions, the superconductive cyclotron accelerator is one of the most efficient treatment equipment compared to other systems. …”
Get full text
Article -
3746
Geometrical Properties of the Nucleus and Chromosome Intermingling Are Possible Major Parameters of Chromosome Aberration Formation
Published 2022-08-01“…Using the Monte Carlo codes Relativistic Ion Tracks (RITRACKS) and Radiation-Induced Tracks, Chromosome Aberrations, Repair and Damage (RITCARD), we investigated how geometrical properties of the cell nucleus, irradiated with ion beams of linear energy transfer (LET) ranging from 0.22 keV/μm to 195 keV/μm, influence the yield of simple and complex exchanges. …”
Get full text
Article -
3747
Laser Ion Acceleration: Status and Perspectives for Fusion
Published 2011-10-01“…Based on the Radiation Pressure Acceleration mechanism, laser-accelerated ion beams can be generated with solid-state density, thus exceeding beams from conventional accelerators by about 14 orders of magnitudes. …”
Get full text
Article -
3748
The Influence of a Magnetic Field on the Sorption of Radionuclides by Clinoptilolite and Composite Sorbents Based on Zeolites
Published 2024-03-01“…The complex made it possible to carry out all the main methods of analysis using ion beams. The targets were placed in the exit, at the Chamber for PIXE. …”
Get full text
Article -
3749
Prospects for the Application of Surface Treatment of Alloys by Electron Beams in State-of-the-Art Technologies
Published 2020-10-01“…The advantages of pulsed electron beam application as compared with laser beams, plasma flows, ion beams are mentioned. Promising trends of the electron-beam processing application are analysed: (1) the surface smoothing, the elimination of surface microcracks with simultaneous change in structural-phase state of the surface layer for creating the high production technologies of finishing treatment of critical metal products of intricate shape from Ti–6Al–4V alloy and titanium, steels of different classes, WC–10 wt.% Co hard alloy, aluminium; (2) the removal of microburrs being formed in manufacturing of precision moulds (SKD11 steel) and biomedical materials (Ti–6Al–4V alloy); (3) the finishing surface treatment of moulds and dies; (4) the improvement of functional properties of metallic biomaterials: stainless steel, titanium and its alloys, the titanium-nickelide-based alloys possessing the shape memory effect, magnesium alloys; (5) the treatment of medical materials and implants; (6) the formation of surface alloys for powerful electrodynamic systems; (7) the improvement of characteristics of aircraft engine and compressor blades; (8) the formation of thermobarrier coatings being applied to combustion-chamber surface; (9) the increase in fatigue service life of steels and alloys; (10) the hardening of rails’ tread surface. …”
Get full text
Article -
3750
A small step towards solving the global chip shortage problem – physical failure analysis
Published 2022“…Hence, this study was performed to provide solutions for the uniform deprocessing of copper interconnects using Xe+ Plasma Focused Ion Beams (Xe+ PFIBs), through the improvement of existing Gas-Assisted Milling (GAM) techniques and the pioneering of surface disruption strategies to counter channelling effects in aligned grains. …”
Get full text
Final Year Project (FYP) -
3751
Time-resolved characteristics of deuteron-beam generated by plasma focus discharge
Published 2018“…The plasma focus has been widely investigated as a radiation source, including as ion-beams, electron-beams and as a source of x-ray and neutron production, providing considerable scope for use in a variety of technological situations. …”
Article -
3752
Microdosimetry and Dose-Averaged LET Calculations of Protons in Liquid Water: A Novel Geant4-DNA Application
Published 2021-10-01“…Microdosimetry provides a theoretical framework for the description of these events, and has been used in several studies to address problems such as the characterization of Linear Energy Transfer (LET) and Relative Biological Effectiveness (RBE) of ion beams for proton therapy applications. Microdosimetry quantities and their distributions can be obtained by means of Monte Carlo simulations. …”
Get full text
Article -
3753
Heavy-Ion-Induced Lung Tumors: Dose- & LET-Dependence
Published 2022-06-01“…The goal of this study is to reduce uncertainties in estimating particle-radiation-induced risk of lung tumorigenesis for manned travel into deep space by improving our understanding of the high-LET-dependent dose-response from exposure to individual ion beams after low particle doses (0.03–0.80 Gy). …”
Get full text
Article -
3754
First direct comparison of whole beam and single beamlet divergences in a negative ion source with simultaneous BES and CFC tile calorimetry measurements
Published 2021-02-01“…The measurement of single beamlet divergence is challenging due to the multi-beamlet nature of the negative ion sources that are required for such systems; diagnostic systems compatible with large high power ion beams can only provide spatially averaged measurements, leading to mixing of beamlet signals within diagnostic results. …”
Get full text
Article -
3755
TOF Analysis of Ions Accelerated at High Repetition Rate from Laser-Induced Plasma
Published 2022-12-01“…Generation methods such as target normal sheath acceleration or similar allow for collimated laminar ion beams to be produced in a compact environment through the use of short-burst terawatt lasers and are a growing field of investment. …”
Get full text
Article -
3756
Feasibility and Safety of Repeated Carbon Ion Radiotherapy for Locally Advanced Unresectable Pancreatic Cancer
Published 2021-02-01“…Purpose: The feasibility and safety of re-irradiation with carbon ion beams for locally recurrent unresectable pancreatic cancer (URPC) after carbon ion radiotherapy (CIRT) was evaluated. …”
Get full text
Article -
3757
Complementary sample preparation strategies (PVD/BEXP) combining with multifunctional SPM for the characterizations of battery interfacial properties
Published 2021-01-01“…In this method, commercial battery materials can be either directly grown on the current collector substrates, or polished by obliqued Ar-ion beams to get a nanoscale flat surface which allows the multifunctional SPM to study sample directly in the liquid electrolyte or in protective oxygen/H2O free environment. …”
Get full text
Article -
3758
Impact of Hypoxia on Carbon Ion Therapy in Glioblastoma Cells: Modulation by LET and Hypoxia-Dependent Genes
Published 2020-07-01“…Hypoxia-induced radioresistance was studied in two human GB cells (U251, GL15) exposed to X-rays or to carbon ion beams with various LET (28, 50, 100 keV/µm), and in genetically-modified GB cells with downregulated EPO signaling. …”
Get full text
Article -
3759
Laser-driven neutrons for time-of-flight experiments?
Published 2020-01-01“…In the last decades, the development of ultra-short (femtosecond) and ultra-high power (> 1018 W/cm2) lasers has opened the door to a vast number of new applications, including the production and acceleration of pulsed ion beams. These have been recently used to produce pulsed neutron beams, reaching fluxes per pulse similar and even higher than those of conventional neutron beams, hence becoming an alternative for the pulsed neutron beam users community. …”
Get full text
Article -
3760
Application of dense plasma focus devices and lasers in the radiation material sciences for the goals of inertial fusion beyond ignition
Published 2020-07-01“…By means of 1-ns laser interferometry and neutron measurements, the characteristics of plasma streams and fast ion beams, as well as the dynamics of their interaction with solid-state targets, have been investigated. 3D profilometry, optical and scanning electron microscopy, atomic emission spectroscopy, X-ray elemental and structural analyses, and precise weighing of specimens before and after irradiation have provided data on the roughening threshold and the susceptibility to damage of the materials under investigation. …”
Get full text
Article