Search results for "cavity"
showing 10 items of 641 documents
High-gradient testing of an $S$-band, normal-conducting low phase velocity accelerating structure
2020
A novel high-gradient accelerating structure with low phase velocity, $v/c=0.38$, has been designed, manufactured and high-power tested. The structure was designed and built using the methodology and technology developed for CLIC $100\text{ }\text{ }\mathrm{MV}/\mathrm{m}$ high-gradient accelerating structures, which have speed of light phase velocity, but adapts them to a structure for nonrelativistic particles. The parameters of the structure were optimized for the compact proton therapy linac project, and specifically to 76 MeV energy protons, but the type of structure opens more generally the possibility of compact low phase velocity linacs. The structure operates in S-band, is backward…
The laser and optical system for the RIBF-PALIS experiment
2017
Abstract This paper describes the laser and optical system for the Parasitic radioactive isotope (RI) beam production by Laser Ion-Source (PALIS) in the RIKEN fragment separator facility. This system requires an optical path length of 70 m for transporting the laser beam from the laser light source to the place for resonance ionization. To accomplish this, we designed and implemented a simple optical system consisting of several mirrors equipped with compact stepping motor actuators, lenses, beam spot screens and network cameras. The system enables multi-step laser resonance ionization in the gas cell and gas jet via overlap with a diameter of a few millimeters, between the laser photons an…
Areca nut and its role in oral submucous fibrosis
2014
Areca nut, commonly called as betel nut or supari, is a fruit of areca catechu palm tree, which is native of South Asia and Pacific Islands. The seed or endosperm is consumed fresh, boiled or after sun drying or curing. Chewing areca nut is thought to have central nervous system stimulating effect and along with this it is known to have salivary stimulating and digestive properties. According to the traditional Ayurvedic medicine, chewing areca nut and betel leaf is a good remedy against halitosis. It is also used for its deworming property. Along with these beneficial effects of areca nut one of its most harmful effects on the human body in general and oral cavity in particular is the deve…
Coherent control of stimulated emission inside one-dimensional Photonic Crystals
2005
In this paper, the quasinormal mode (QNM) theory is applied to discuss the quantum problem of an atom embedded inside a one-dimensional (1D) photonic band gap (PBG) cavity pumped by two counterpropagating laser beams. The e.m. field is quantized in terms of the QNMs in the 1D PBG and the atom modeled as a two-level system is assumed to be weakly coupled to just one of the QNMs. The main result of the paper is that the decay time depends on the position of the dipole inside the cavity, and can be controlled by the phase difference of the two laser beams. © 2005 The American Physical Society
Evaluation of a digital radiography to estimate working length
1997
The working lengths obtained with different methods in single-rooted teeth were compared. An endodontic rule in millimeters and calipers was used as a direct method of measurement (on endodontic files). As indirect methods, measurements were taken from conventional x-rays with calipers and with a digital radiological measurement system. No statistically significant differences were obtained between the direct and indirect methods. Three vertical angulations were taken for the indirect methods (0 degree, 15 degrees, and 30 degrees). No significant differences were found between results for the two indirect methods versus the standard method except for the 30 degrees angulation, which resulte…
Biopsy vs. brushing: comparison of two sampling methods for the detection of HPV-DNA in squamous cell carcinoma of the oral cavity
2012
Background: HR HPV infection was proposed as aetiological factor of oral squamous cell carcinomas (OSCC). HPV frequency in OSCC is highly variable, due to the discrepancy in oral sampling procedures, HPV testing methods and inclusion criteria regarding tumour site (strictly oral cavity vs. nearby structures). Our aim was to compare HPV DNA frequency and type-specific distribution in paired cytological and histological samples of SCC strictly located in oral cavity. The correlation between HPV detection rate by each method of sampling and demographical, behavioural and clinical-pathological variables was also examined. Patients and methods: HPV DNA was detected in brushed cells and formalin-…
From palliation to cure: PIPAC for peritoneal malignancies
2019
Introduction Systemic chemotherapy offers poor control over peritoneal disease, maybe as a consequence of restricted drug availability within the abdominal cavity. Locoregional chemotherapy may overcome these shortcomings but its administration is limited to a few patients with confined peritoneal spread. Pressurized intraperitoneal aerosol chemotherapy (PIPAC) emerged in the last years as a novel method of intraperitoneal drug administration. Evidence acquisition We report a meta-analysis of published studies on PIPAC safety and pathological anti-tumoral efficacy on PC from various tumor entities, with the aim of providing more evidence to support further research. This systematic review a…
Non-invasive diagnosis of oral cancer: The role of electro-analytical methods and nanomaterials
2017
Abstract Oral cancer is a kind of head and neck cancer and is each cancerous tissue growth located in the oral cavity. Non-invasive early diagnosis of oral cancer is the most effective means to reduce death from this disease or increase the survival time. In this review, various types of electro-analytical methods for detection of oral cancer were discussed. The emphasis is placed on non-invasive detection of oral based on immune-, geno-, cyto-, apta-, and enzyme-biosensing strategies. In the first part of review, various electrochemical immunosensing methods for the detection of common biomarker in oral cancer and examines their potential as a new method were discussed. In the second part …
Preoperative Radiochemotherapy and Radical Surgery of Advanced Head and Neck Cancers — Results of a Prospective, Multicenter DÖSAK Study
1994
Present research concerning the efficiacy of therapeutic strategies for squamous cell carcinomas of the oral cavity and the oropharynx profits from former observational studies. The so-called retrospective German, Austrian, and Swiss Association for Head and Neck Tumors (DOSAK) study (Platz et al. 1986) served to review existing proposals for classification (UICC 1973, 1978; AJC 1978) and to develop a statistical classification which enables the head and neck oncologist to define prognostically homogeneous patient collectives. The treatment-dependent prognostic index (TPI) was the corresponding result (Platz et al. 1982).
High flow nasal therapy in perioperative medicine: from operating room to general ward
2018
Abstract Background High flow nasal therapy (HFNT) is a technique in which humidified and heated gas is delivered to the airways through the nose via small nasal prongs at flows that are higher than the rates generally applied during conventional oxygen therapy. The delivered high flow rates combine mixtures of air and oxygen and enable different inspired oxygen fractions ranging from 0.21 to 1. HFNT is increasingly used in critically ill adult patients, especially hypoxemic patients in different clinical settings. Main body Noninvasive ventilation delivers positive pressure (end-expiratory and inspiratory pressures or continuous positive airway pressure) via different external interfaces. …