Category Ranking
98%
Total Visits
921
Avg Visit Duration
2 minutes
Citations
20
Article Abstract
In this paper we discuss probe properties in terms of probe currents, probe sizes, energy spread, virtual source sizes, and brightness in a 1.2-MV cold field-emission (cold FE) transmission electron microscope (TEM) equipped with a magnetic gun lens. The probe size increased gradually in proportion to the (3/8)th power of the probe current, very unusual behavior in cold FE guns but typical behavior in thermionic guns. This is due to the magnetic gun lens, which caused large emission angles for electron beams in the probe before being limited by aberrations at the gun and acceleration tube. The brightness reached the maximum at 1.62 × 10 A/(msr) and then decreased with increasing the emission current. The energy spread of the beam, including the Boersch effect, was 0.32-0.50 eV, comparable to that of conventional cold FE guns without magnetic gun lens. Experimental analysis indicated that neither noises nor aberrations caused the probe size increase under the optimized illumination condition. The virtual source size increased from 11.1 to 24.7 nm with the increase in the emission current. To describe this behavior, we conjecture that this brightness reduction is due to increase in the virtual source size caused by trajectory displacement created by stochastic Coulomb interactions near the emitter.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.ultramic.2019.04.002 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Evaluation of Perception of Photic Phenomena Through Diffractive Multifocal Intraocular Lens Designs by Its Virtual Implantation.
J Refract Surg
September 2025
JENVIS Research, Jena, Germany.
Purpose: To analyze the difference in objective and subjective photic phenomena following virtual implantation of three different presbyopia-correcting diffractive intraocular lens (IOL) designs.
Methods: The study was conducted at JENVIS Research Germany. A prospective cross-over and double-masked trial design was used.
Reimagining Acute Diabetes Care: Insights From the Victorian Virtual Emergency Department.
Diabetes Care
September 2025
Victorian Virtual Emergency Department, Northern Health, Epping, Victoria, Australia.
Objective: New approaches to diabetes care are needed to better identify and manage diabetes emergencies outside of hospitals.
Research Design And Methods: A descriptive analysis of routinely collected data was conducted using data from the Victorian Virtual Emergency Department (VVED) Diabetes, a telehealth service that provides emergency care, including ketone testing by ambulance personnel, for patients across Victoria, Australia, experiencing non-life-threatening diabetes-related emergencies.
Results: Between July and December 2024, VVED Diabetes managed 868 diabetes-related emergencies, with 82.
Multi-modal virtual reality system for tinnitus treatment methods and validation.
PLoS One
September 2025
Department of Otorhinolaryngology-Head and Neck Surgery, Ansan Hospital, Korea University College of Medicine, Ansan, Republic of Korea.
Virtual reality (VR) has been utilized in clinical treatment because it can efficiently simulate situations that are difficult to control in the real world. In this study, we evaluated the efficacy of VR in patients with chronic subjective tinnitus. We assessed the clinical effectiveness based on electroencephalogram (EEG) analysis and questionnaire responses after patients participated in a 6-8-week VR-based tinnitus relief program.
View Article and Find Full Text PDFInnovations in communication training for medical and nursing students: Virtual reality communication tool for application and evaluation with key stakeholders and students (VR-TALKS) - a study protocol.
PEC Innov
December 2025
Institute for General Practice and Palliative Care, Hannover Medical School, Germany.
Background: In healthcare education, virtual reality (VR), simulating real-world situations, is emerging as a tool to improve communication skills, particularly in sensitive scenarios involving patients and caregivers. While promising, VR-based education also poses challenges such as avatar realism, cognitive load, and the need for pedagogical grounding.
Objective: This protocol paper presents the VR-TALKS project, which aims to develop, apply, and evaluate VR scenarios designed to teach healthcare students communication skills in serious illness scenarios.
Student Integration into Hospital Clinical Pharmacy Services in an Advanced Pharmacy Practice Experience: A Process Evaluation.
Can J Hosp Pharm
September 2025
, BSP, ACPR, PharmD, PhD, is Professor and Director with the College of Pharmacy, Faculty of Health, Dalhousie University, Halifax, Nova Scotia.
Background: Student integration into clinical pharmacy services during Advanced Pharmacy Practice Experiences (APPEs) is helpful for both student learning and patient care. Identifying how to integrate students into clinical pharmacy services during APPEs is likely to be site-specific, depending on the pharmacy department's service emphasis and capacity in the particular health care setting.
Objective: To identify elements of rotation implementation that facilitated pharmacy students' learning and integration into hospital clinical pharmacy services during a Collaborative Health Care (CHC) setting APPE.