R Diaz perez
85529914
Lithium loaded liquid scintillator production for the PROSPECT experiment
This work reports the production and characterization of lithium loaded liquid scintillator (LiLS) for the Precision Reactor Oscillation and Spectrum Experiment (PROSPECT) Fifty nine 90 liter batches of LiLS (6Li mass fraction 0.082% 0.001% were produced and samples from all batches were characterized by measuring their optical absorbance relative to air, light yield relative to a pure liquid scintillator reference, and pulse shape discrimination capability. Fifty seven batches passed the quality assurance criteria and were used for the PROSPECT experiment.
Journal of Instrumentation
Prospect Collaboration J Ashenfelter A Baha Balantekin H R Band Christopher D Bass Denis E Bergeron Danielle Berish Lindsey Jordan Bignell Nathaniel S Bowden J P Brodsky Clinton D Bryan C Camilo Reyes S Campos J J Cherwinka Timothy M Classen Andrew Conant Daniel Davee David J Dean Georg Deichert R Diaz Perez Milind Vaman Diwan Michelle J Dolinski Anna Erickson Michael Febbraro Benjamin Foust Jeremy Gaison Alfredo nmn Galindo-Uribarri Corey Gilbert Brennan Hackett Sunej Hans A B Hansell Bruce L Hayes Karsten M Heeger Jonathan Insler David E Jaffe D C Jones Olga Kyzylova Charles E Lane Thomas Langford J J Larosa B R Littlejohn X Lu D A MartinezCaicedo James Till Matta Robert D McKeown M P Mendenhall P E Mueller H Pieter Mumm James Napolitano Russell Neilson James A Nikkel D Norcini Svetlana Nour Dimitry A Pushin Xin Qian Elisa Romero-Romero Richard Rosero D Sarenac P T Surukuchi Mark Anthony Tyra Robert L Varner Brett Viren C G White J Wilhelmi T Wise Minfang Yeh Yung-Ruey Yen Anzhou Zhang C D Zhang Xingfeng Zhang
221186580
A Spectrometric Approach to Characterize the Rayleigh Scattering Length for Ultrapure Liquid Scintillator Detectors
Good optical transparency is a fundamental requirement of the liquid scintillator (LS) detectors. Characterizing the transparency of an LS to its own emitted light is the key parameter to determine the overall sensitivity of a large volume detector. The attenuation of light in an ultrapure LS is dominated by Rayleigh scattering, which poses an intrinsic limit to the transparency of LS. This work presents a highly sensitive spectrometric approach of measuring the wavelength dependent scattering length of ultraclean liquids by applying the Einstein Smoluchowski Cabannes theory to measured scattered light intensity. The scattering lengths of linear alkyl benzene (LAB) and EJ309 base (Di isopropylnaphthalene, DIN) were measured and reported in the wavelength range of 410 510 nm. The spectral peak maximum of scintillation light emitted by a nominal LS is around 430 nm at which the scattering length for LAB and EJ309 base was determined to be 27.9 2.3 m and 6.1 0.6 m respectively.
Sasmit S Gokhale Richard Rosero R Diaz Perez C Camilo Reyes Sunej Hans Minfang Yeh
227072951
A spectrometric approach to measuring the Rayleigh scattering length for liquid scintillator detectors
Good optical transparency is a fundamental requirement of liquid scintillator (LS) detectors. Characterizing the transparency of a liquid scintillator to its own emitted light is a key parameter to determine the overall sensitivity of a large volume detector. The attenuation of light in an optical pure LS is dominated by Rayleigh scattering, which poses an intrinsic limit to the transparency of LS. This work presents a spectrometric approach of measuring the wavelength dependent scattering length of liquids by applying the Einstein Smoluchowski theory to a measurement of scattered light intensity. The scattering lengths of linear alkyl benzene (LAB) and EJ309 base (Di isopropylnaphthalene, DIN) were measured and are reported in the wavelength range of 410 520 nm. The spectral peak of scintillation light emitted by a nominal LS is around 430 nm at which the scattering lengths for LAB and EJ 309 base were determined to be 27.9 2.3 m and 6.1 0.6 m.
Sasmit S Gokhale Richard Rosero R Diaz Perez C Camilo Reyes Sunej Hans Minfang Yeh
221095878
Light Yield Quenching and Quenching Remediation in Liquid Scintillator Detectors
Quenching of light emission from an LAB based scintillator by the addition of organic amines and carboxylic acids is examined. Chemical functional groups of the quenching agents play an important role in this reduction. It is shown that "salt" formation at a 1:1 mole ratio in a mixed amine acid system, reduces quenching by a factor of 2. Supporting NMR spectra are presented. This "quenching neutralization" has the potential to reduce the light loss incurred when metals complexed with quenching agents are loaded into organic scintillators.
Sunej Hans James B Cumming Richard Rosero R Diaz Perez C Camilo Reyes Sasmit S Gokhale Minfang Yeh
204774252
Determining the probability of locating peaks using computerized peak location methods in gamma ray spectra as a function of the relative peak area uncertainty.
The probabilities of locating peaks with a high relative peak area uncertainty were determined empirically with nine types of peak location software used in laboratories engaged in gamma ray spectrometry measurements. It was found that it is not possible to locate peaks with a probability of 0.95, when they have a relative peak area uncertainty in excess of 50% Locating peaks at these relatively high peak area uncertainties with a probability greater than 0.95 is only possible in the library driven mode, where the peak positions are supposed a priori. The deficiencies of the library driven mode and the possibilities to improve the probabilities of locating peaks are briefly discussed.
Applied radiation and isotopes including data, instrumentation and methods for use in agriculture, industry and medicine
M C Ali Santoro Marios J Anagnostakis Tatiana Boshkova Antonia Camacho M C Fornaciari Iljadica Sean M Collins R Diaz Perez Jose Ubiratan Delgado M Durasavic Maria Amor Duch V H Elvira Regio dos Santos Gomes Arunas Gudelis Daniela Gurau S Hurtado Bermudez Raquel Idoeta Aleksandar Jevremovic Aleksandar Kandic Matjaz Korun K Karfopolous Matthias Laubenstein Stephen Long Romul Mircea Margineanu I Mitsios Daniel Mulas J K Nikolic A I Pantelica Virginia Peyres Medina Leticia S Pibida Constantinos Potiriadis R L da Silva Stephen T Siri Bojan Seslak Leen Verheyen Branko Vodenik Ivana Vukanac Hannah Wiedner Benjamin Zorko
201183926
Trastornos temporomandibulares en escolares mexicanos
espanolObjetivo: determinar la frecuencia de trastornos temporomandibulares (TTM) en escolares. Material y Metodos: se incluyeron 981 escolares de tres escuelas primarias publicas, se registraron variables sociodemograficas y evaluacion de la articulacion temporomandibular con el indice clinico de Helkimo empleado por la Organizacion Mundial de la Salud, las evaluaciones fueron realizadas por 10 pasantes de odontologia previamente capacitados (Kappa interobservador=0.850) la informacion fue procesada en SPSS V.21.0; para determinar la prevalencia de TTM se utilizo estadistica descriptiva, para evaluar la asociacion de TTM con el sexo se utilizo X2. Resultados: la edad promedio fue 8.6+ 1.6 anos, el 54% fueron ninas. 43.4% de la muestra presento trastornos temporomandibulares; 72.3% con trastorno unico, 20.4% con dos TTM y 7.3% mas de dos TTM. Los TTM no mostraron asociacion con el sexo ni con la edad (p>0.05) Discusion: El diagnostico de TTM en escolares es poco frecuente, el crecimiento y desarrollo de los ninos puede modificar la frecuencia y severidad de los trastornos. La frecuencia de TTM fue del 43.4% su distribucion fue similar en ambos sexos. EnglishObjective: To determine temporomandibular disorders (TMD) frequency in schoolchildren. Material and methods: Included 891 school children of three elementary public schools, we registered sociodemographic variables and temporomandibular evaluation with Helkimo clinic index used by World Health Organization, all evaluations were performance by ten undergraduates dentist with prior capacitation (interobserver Kappa=0,850) information was processed in SPSS V.21.0; to determine TMD prevalence we used descriptive statistics, to evaluate association between TMD with sex X2 was used. Results: Mean of age was 8.6+ 1.6 years, 54% were girls, 43.4% of students had temporomandibular disorders, 72.3% only one disorder, 20.4% two and 7.3% more than two disorders. TMD had no association with sex neither age (p>0.05) Discussion: TMD diagnostics in schoolchildren is infrequent, frequency and severity of this disorders will be modified by children's growth and development. TMD frequency was 43.3% its distribution was similar in both sexes.
R Diaz Perez Aguilera Peralta H Gutierrez Valdez Dulce
227146673
Figueroa Alcantara, Hugo Alberto y Ramirez Velazquez, Cesar Augusto (Coordinadores) Investigacion y docencia en bibliotecologia, Mexico: UNAM, Facultad de Filosofia y Letras, Colegio de Bibliotecologia UNAM, Direccion General de Asuntos del Personal Academico, 2007, 304p
R Diaz Perez Frida Margarita
23064594
[Evaluation of Spanish websites useful for the primary care physicians]
OBJECTIVE To assess the usefulness of medical websites in spanish for the primary care physicians using quality criteria chosen by themselves. DESIGN Observational, descriptive, cross sectional study. SETTING Internet. PARTICIPANTS The search was performed in Google and Yahoo using as key words the name of Spanish National Health Service medical specialities, primary care and synonyms. The first one hundred links in spanish for every keyword were included in the study. EXCLUSION CRITERIA paysites, commercial sites, non clinical content, link sites, patient oriented sites and on line editions of printed issues. METHODS A survey was carried out asking the primary care physicians of area IV in Asturias which were the most important criteria that a medical website should fulfil. The results of this survey were used to make an assessment questionnaire. Every site was analysed randomizedly by two researchers and was classified as excelent, good, medium or bad. RESULTS 2.095 medical websites in spanish were found, being repeated 1.218 (58.14% From the 877 analysed websites, 597 (68.07% were excluded. The Intraclass Correlation Coefficient (ICC) was 0.73 (95% CI, 0.66% 0.785% 5 websites (1.8% were rated as excelent and the 77.2% as medium or bad. The sites with better ratings were those oriented to the primary care professionals. CONCLUSIONS The most websites were rated as medium or bad. The evaluation questionnaire is useful for futures studies.
Atencion primaria
I Rancano Garcia Jose Angel Rodrigo Pendas R Villa Estebanez M Abdelsater Fayad R Diaz Perez David Alvarez Garcia
12795403
[Surgical treatment of gastric carcinoma]
Revista de la Facultad de Medicina, Universidad Nacional de Colombia
R Diaz Perez
37882146
Healing and revascularization of apical periodontium and dental pulps in apicoectomized and nonapicoectomized tooth replants in monkeys. A study of fully developed teeth.
This report primarily concerns an experimental study of the effect of apicoectomy on the healing and revascularization of the periodontal membrane and dental pulps in tooth replants. Five rhesus monkeys (Macaca mulatta) were subjected to surgical procedures in which twenty incisor teeth were extracted and immediately replanted. Ten of these incisors were subjected to apicoectomy. Healing and revascularization of periapical tissues and dental pulps were evaluated by histologic and India ink perfusion techniques. Apicoectomized replants were characterized by (1) loss of dental substance (tooth apex) and creation of large periapical spaces, (2) exposure of dental pulps and production of periapical inflammatory processes with destruction of alveolar bone, and (3) blocking of normal healing because of persistence of chronic periapical inflammatory processes. In contrast, nonapicoectomized replants depicted short lived primary inflammatory responses and healing processes characterized by variable histologic responses.
Oral surgery, oral medicine, and oral pathology
W A Castelli Carlos E Nasjleti Raul Guillermo Caffesse R Diaz Perez