Relationship between the cathodoluminescence emission and resistivity in In doped CdZnTe crystals

Cadmium zinc telluride, CdZnTe, bulk single crystals doped with 1019 at./cm3 of indium in the initial melt were grown by vertical Bridgman technique. The samples were investigated by energy dispersive spectroscopy, cathodoluminiscence (CL), and current-voltage behavior at room temperature. The results shows that Cd and Te vacancy concentration depend on the indium and zinc concentrations. CL measurements indicate a relationship between radiative centers associated to Cd and Te vacancies and resistivity values

Post-synthetic ligand exchange as a route to improve the affinity of ZIF-67 towards CO2

The Zeolitic Imidazolate Framework 67 (ZIF-67) is a highly promising material owing to its exceptional thermal stability, large specific surface area, cost-effectiveness, and versatile applications. One of the potential applications of ZIF-67 is gas separation processes, among which the separation of CO2/CH4 mixtures has attracted great interest nowadays in the biogas sector. However, when it comes to CO2/CH4 separation, ZIF-67 falls short as it lacks the desired selectivity despite its high adsorption capacity. This limitation arises from its relatively low affinity towards CO2. In this study, we have addressed this issue by partially exchanging the ligand of ZIF-67, specifically replacing 2-methylimidazole with 1,2,4 (1H) triazole, which introduces an additional nitrogen atom. This modification resulted in ZIF-67 showing significantly enhanced affinity towards CO2 and, as a result, greater selectivity towards CO2 over CH4. The modified materials underwent thorough characterization using various techniques, and their adsorption capacity was evaluated through high-pressure adsorption isotherms. Furthermore, their separation performance was assessed using the Ideal Solution Adsorption Theory, which provided valuable insights into their potential for efficient gas separation.Financial support from Ministerio de Ciencia e Innovación (Spain, PID2020-116998RB-I00) is gratefully acknowledged. Conselleria de Innovacion, Universidades, Ciencia y Sociedad Digital (CIPROM/2021/022). This study forms part of the Advanced Materials programme and was supported by MCIN with funding from European Union NextGenerationEU (PRTR-C17.I1) and by Generalitat Valenciana

Measurement of 73 Ge(n,γ) cross sections and implications for stellar nucleosynthesis

© 2019 The Author(s). Published by Elsevier B.V.73 Ge(n,γ) cross sections were measured at the neutron time-of-flight facility n_TOF at CERN up to neutron energies of 300 keV, providing for the first time experimental data above 8 keV. Results indicate that the stellar cross section at kT=30 keV is 1.5 to 1.7 times higher than most theoretical predictions. The new cross sections result in a substantial decrease of 73 Ge produced in stars, which would explain the low isotopic abundance of 73 Ge in the solar system.Peer reviewe

Measurement of the 240Pu(n,f) cross-section at the CERN n-TOF facility : First results from experimental area II (EAR-2)

The accurate knowledge of the neutron-induced fission cross-sections of actinides and other isotopes involved in the nuclear fuel cycle is essential for the design of advanced nuclear systems, such as Generation-IV nuclear reactors. Such experimental data can also provide the necessary feedback for the adjustment of nuclear model parameters used in the evaluation process, resulting in the further development of nuclear fission models. In the present work, the 240Pu(n,f) cross-section was measured at CERN's n-TOF facility relative to the well-known 235U(n,f) cross section, over a wide range of neutron energies, from meV to almost MeV, using the time-of-flight technique and a set-up based on Micromegas detectors. This measurement was the first experiment to be performed at n-TOF's new experimental area (EAR-2), which offers a significantly higher neutron flux compared to the already existing experimental area (EAR-1). Preliminary results as well as the experimental procedure, including a description of the facility and the data handling and analysis, are presented

The 33S(n,α)30Si cross section measurement at n-TOF-EAR2 (CERN) : From 0.01 eV to the resonance region

The 33S(n,α)30Si cross section measurement, using 10B(n,α) as reference, at the n-TOF Experimental Area 2 (EAR2) facility at CERN is presented. Data from 0.01 eV to 100 keV are provided and, for the first time, the cross section is measured in the range from 0.01 eV to 10 keV. These data may be used for a future evaluation of the cross section because present evaluations exhibit large discrepancies. The 33S(n,α)30Si reaction is of interest in medical physics because of its possible use as a cooperative target to boron in Neutron Capture Therapy (NCT)

Characterization of the n-TOF EAR-2 neutron beam

The experimental area 2 (EAR-2) at CERNs neutron time-of-flight facility (n-TOF), which is operational since 2014, is designed and built as a short-distance complement to the experimental area 1 (EAR-1). The Parallel Plate Avalanche Counter (PPAC) monitor experiment was performed to characterize the beam prole and the shape of the neutron 'ux at EAR-2. The prompt γ-flash which is used for calibrating the time-of-flight at EAR-1 is not seen by PPAC at EAR-2, shedding light on the physical origin of this γ-flash

Estrategia invasiva de rutina en el síndrome coronario agudo sin elevación del segmento ST con disfunción renal. Resultados del registro ARIAM-SEMICYUC

Objetivo: Evaluar la utilización y efectividad de la estrategia invasiva de rutina (EIR) en pacientes con síndrome coronario agudo sin elevación de ST con disfunción renal en el mundo real. Métodos: Estudio de cohortes retrospectivo basado en el registro ARIAM-SEMICYUC (años 2011- 2014). Se consideró que había disfunción renal cuando el GFR (Cockroft-Gault) era menor de 60 ml/min (disfunción moderada) o de 30 ml/min (disfunción grave). Se excluyeron los pacientes en los que la coronariografía precoz (< 72 h) se debió a shock cardiogénico o isquemia recurrente. El desenlace primario fue la mortalidad hospitalaria. El control del confounding se realizó mediante un análisis de propensión. Resultados: Se analizan 4.279 pacientes, de los cuales un 26% tenía disfunción renal moderada y un 5% disfunción grave. Los pacientes con disfunción renal presentaron una mayor gravedad y comorbilidad, una mayor mortalidad hospitalaria (8,6 frente a 1,8%) y una menor utilización de la EIR (40 frente a 52%). Las OR ajustadas mediante emparejamiento para pacientes sin/con disfunción renal fueron de 0,38 (intervalo de confianza al 95% [IC95%] de 0,17 a 0,81) y 0,52 (IC95% de 0,32 a 0,87), respectivamente (p de interacción 0,4779). El impacto de la EIR (diferencia de riesgos ajustada) fue mayor en el grupo con disfunción renal (−5,1%, IC95% entre −8,1 y −2,1, frente a −1,6%, IC95% entre −2,6 y −0,6, p de interacción = 0,0335). Tampoco se detectó interacción significativa respecto a los demás enlaces considerados (mortalidad en UCI o a los 30 días, riesgo combinado de muerte o infarto, fracaso renal agudo o hemorragias moderadas/graves). Conclusiones: Los resultados evidencian que la efectividad de la EIR es similar en pacientes con función renal normal o reducida y alertan sobre una infrautilización de esta estrategia en estos últimos.Objective: To evaluate the use and effectiveness of a routine invasive strategy (RIS) in patients with acute coronary syndrome without persistent ST-segment elevation with renal dysfunction in the real world scenario. Methods: A retrospective cohort study based on the ARIAM-SEMICYUC Registry (2011-2014) was carried out. Renal dysfunction was defined as GFR (Cockroft-Gault)<60ml/min (moderate dysfunction) or<30ml/min (severe dysfunction). Patients in which early angiography (<72h) was performed due to cardiogenic shock or recurrent myocardial ischemia were excluded. The primary endpoint was hospital mortality. Confounding factors were controlled using propensity score analysis. Results: A total of 4,279 patients were analyzed, of which 26% had moderate renal dysfunction and 5% severe dysfunction. Patients with renal dysfunction had greater severity and comorbidity, higher hospital mortality (8.6 vs. 1.8%), and lesser use of the RIS (40 vs. 52%). The adjusted OR for mortality in patients without/with renal dysfunction were 0.38 (95% confidence interval [95%CI] 0.17 to 0.81) and 0.52 (95%CI 0.32 to 0.87), respectively (interaction P-value=.4779). The impact (adjusted risk difference) of RIS was higher in the group with renal dysfunction (-5.1%, 95%CI -8.1 to -2.1 vs. -1.6%, 95%CI -2.6 to -0.6; interaction P-value=.0335). No significant interaction was detected for the other endpoints considered (ICU mortality, 30-day mortality, myocardial infarction, acute renal failure or moderate/severe bleeding).Conclusions: The results suggest that the effectiveness of IRS is similar in patients with normal or abnormal renal function, and alert to the under-utilization of this strategy in such patients

Measurement of the Ge 70 (n,γ) cross section up to 300 keV at the CERN n-TOF facility

©2019 American Physical Society.Neutron capture data on intermediate mass nuclei are of key importance to nucleosynthesis in the weak component of the slow neutron capture processes, which occurs in massive stars. The (n,γ) cross section on Ge70, which is mainly produced in the s process, was measured at the neutron time-of-flight facility n-TOF at CERN. Resonance capture kernels were determined up to 40 keV neutron energy and average cross sections up to 300 keV. Stellar cross sections were calculated from kT=5 keV to kT=100 keV and are in very good agreement with a previous measurement by Walter and Beer (1985) and recent evaluations. Average cross sections are in agreement with Walter and Beer (1985) over most of the neutron energy range covered, while they are systematically smaller for neutron energies above 150 keV. We have calculated isotopic abundances produced in s-process environments in a 25 solar mass star for two initial metallicities (below solar and close to solar). While the low metallicity model reproduces best the solar system germanium isotopic abundances, the close to solar model shows a good global match to solar system abundances in the range of mass numbers A=60-80.Peer reviewedFinal Published versio