Relaci?n entre la congesti?n vehicular, estr?s y rendimiento laboral individual en empresas industriales de fabricaci?n de envases del Callao

Estudiamos la relaci?n entre la congesti?n vehicular, el estr?s y el rendimiento laboral, la congesti?n vehicular es considerado un importante problema de pol?tica p?blica ya que tiene el potencial de afectar la econom?a y los niveles de productividad de un pa?s. Para determinar las relaciones entre estas variables se?aladas se realiz? un estudio con trabajadores de Molpack del Per? (Molpack) y Peruana de Moldeados (Pamolsa) empresas industriales de fabricaci?n de envases ubicadas en la Provincia Constitucional del Callao. El estudio es de car?cter descriptivo de correlaci?n, as? mismo es considerada cuantitativa de tipo transversal. Se utiliz? como poblaci?n a los 110 trabajadores de Molpack del Per? y se obtuvo una muestra de 278 trabajadores para el caso de Pamolsa. Los resultados obtenidos nos demuestran que existe relaci?n entre las variables congesti?n vehicular, estr?s y rendimiento laboral, no obstante la fuerza de la relaci?n es baja

Impact of buffer gas quenching on the S-1(0) -> P-1(1) ground-state atomic transition in nobelium

International audienceUsing the sensitive Radiation Detected Resonance Ionization Spectroscopy (RADRIS) techniquean optical transition in neutral nobelium (No, Z = 102) was identified. A remnant signal when delaying the ionizing laser indicated the influence of a strong buffer gas induced de-excitation of the optically populated level. A subsequent investigation of the chemical homologue, ytterbium (Yb, Z = 70), enabled a detailed study of the atomic levels involved in this process, leading to the development of a rate equation model. This paves the way for characterizing resonance ionization spectroscopy (RIS) schemes used in the studyof nobelium and beyond, where atomic properties are currently unknown

Mortality and pulmonary complications in patients undergoing surgery with perioperative SARS-CoV-2 infection: an international cohort study

Background: The impact of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) on postoperative recovery needs to be understood to inform clinical decision making during and after the COVID-19 pandemic. This study reports 30-day mortality and pulmonary complication rates in patients with perioperative SARS-CoV-2 infection. Methods: This international, multicentre, cohort study at 235 hospitals in 24 countries included all patients undergoing surgery who had SARS-CoV-2 infection confirmed within 7 days before or 30 days after surgery. The primary outcome measure was 30-day postoperative mortality and was assessed in all enrolled patients. The main secondary outcome measure was pulmonary complications, defined as pneumonia, acute respiratory distress syndrome, or unexpected postoperative ventilation. Findings: This analysis includes 1128 patients who had surgery between Jan 1 and March 31, 2020, of whom 835 (74·0%) had emergency surgery and 280 (24·8%) had elective surgery. SARS-CoV-2 infection was confirmed preoperatively in 294 (26·1%) patients. 30-day mortality was 23·8% (268 of 1128). Pulmonary complications occurred in 577 (51·2%) of 1128 patients; 30-day mortality in these patients was 38·0% (219 of 577), accounting for 81·7% (219 of 268) of all deaths. In adjusted analyses, 30-day mortality was associated with male sex (odds ratio 1·75 [95% CI 1·28–2·40], p\textless0·0001), age 70 years or older versus younger than 70 years (2·30 [1·65–3·22], p\textless0·0001), American Society of Anesthesiologists grades 3–5 versus grades 1–2 (2·35 [1·57–3·53], p\textless0·0001), malignant versus benign or obstetric diagnosis (1·55 [1·01–2·39], p=0·046), emergency versus elective surgery (1·67 [1·06–2·63], p=0·026), and major versus minor surgery (1·52 [1·01–2·31], p=0·047). Interpretation: Postoperative pulmonary complications occur in half of patients with perioperative SARS-CoV-2 infection and are associated with high mortality. Thresholds for surgery during the COVID-19 pandemic should be higher than during normal practice, particularly in men aged 70 years and older. Consideration should be given for postponing non-urgent procedures and promoting non-operative treatment to delay or avoid the need for surgery. Funding: National Institute for Health Research (NIHR), Association of Coloproctology of Great Britain and Ireland, Bowel and Cancer Research, Bowel Disease Research Foundation, Association of Upper Gastrointestinal Surgeons, British Association of Surgical Oncology, British Gynaecological Cancer Society, European Society of Coloproctology, NIHR Academy, Sarcoma UK, Vascular Society for Great Britain and Ireland, and Yorkshire Cancer Research

Un nouveau piège à ions circulaire pour la spectrométrie de masse et la structure nucléaire

Nuclear mass measurements give a direct determination of the binding energy, the result of all forces acting in the nucleus. The exploration of nuclear structure requires the measurement of masses far from stability. However the production of radioactive ions is not very selective and the ion of interest is often lost in a background of isobaric contaminants. The use of linear ion traps and buffer gas cooling has been highly developed in recent years, allowing mass measurement of exotic nuclei with high accuracy. This thesis focuses on the development of a novel circular Paul trap, "the ion circus". Its geometry allows confining ions during several turns. Thus, they can be cooled with a lower buffer gas pressure of about 10-4 mbar. Furthermore, during trapping and cooling, the ions may be mass separated with a resolving power sufficient to exclude isobaric contaminants. The first prototype was built and tested at Orsay. Currently, the mass of very exotic nuclei can only be predicted. This thesis also examines the prediction of different mass models by comparing them with the HFB-17 microscopic model. The study of the two-neutron separation energies of HFB-17 revealed numerical instability. To improve this, we have corrected the deformation energies calculated by this model, using as a reference the new isotopic chains 143-146Xe and 223-229Rn, measured with the ISOLTRAP spectrometer at CERN.La détermination de la masse nucléaire permet d'accéder à l'énergie de liaison donc au bilan de toutes les forces agissant dans le noyau. L'exploration de la structure nucléaire requiert la mesure des masses loin de la stabilité. Néanmoins la production des ions radioactifs est peu sélective et l'ion d'intérêt est souvent noyé dans un fond de contaminants isobariques. Ces dernières années, l'utilisation des pièges à ions linéaires et du refroidissement par gaz tampon a été fortement développée permettant la mesure de masse des noyaux exotiques avec une grande précision. Cette thèse porte sur le développement innovant d'un piège de Paul circulaire, "le cirque d'ions". Sa géométrie lui permet de confiner les ions sur un grand nombre de tours. Ainsi, ils peuvent être refroidis avec une pression de gaz tampon de l'ordre de 10-4 mbar. Par ailleurs, il est capable de trier en masse les ions piégés et refroidis avec un pouvoir de résolution suffisant pour séparer des isobares. Nous avons réalisé et testé le premier prototype de ce spectromètre à Orsay. Cette thèse étudie également les prédictions des masses par les différents modèles théoriques, en les comparant avec l'approche microscopique HFB-17. Actuellement, la masse des noyaux très exotiques peut seulement être prédite. L'étude de l'énergie de séparation de deux neutrons avec HFB-17 met en évidence des zones d'instabilité numérique. Afin de l'améliorer, nous avons apporté une correction aux énergies de déformation calculées par ce modèle, en utilisant comme référence les masses des chaînes isotopiques 143-146Xe et 223-229Rn que nous avons mesurées avec le spectromètre ISOLTRAP au CERN

Un nouveau piège à ions circulaire pour la spectrométrie de masse et la structure nucléaire

La détermination de la masse nucléaire permet d'accéder à l'énergie de liaison donc au bilan de toutes les forces agissant dans le noyau. L'exploration de la structure nucléaire requiert la mesure des masses loin de la stabilité. Néanmoins la production des ions radioactifs est peu sélective et l'ion d'intérêt est souvent noyé dans un fond de contaminants isobariques. Ces dernières années, l'utilisation des pièges à ions linéaires et du refroidissement par gaz tampon a été fortement développée permettant la mesure de masse des noyaux exotiques avec une grande précision. Cette thèse porte sur le développement innovant d'un piège de Paul circulaire, "le cirque d'ions". Sa géométrie lui permet de confiner les ions sur un grand nombre de tours. Ainsi, ils peuvent être refroidis avec une pression de gaz tampon de l'ordre de 10-4 mbar. Par ailleurs, il est capable de trier en masse les ions piégés et refroidis avec un pouvoir de résolution suffisant pour séparer des isobares. Nous avons réalisé et testé le premier prototype de ce spectromètre à Orsay. Cette thèse étudie également les prédictions des masses par les différents modèles théoriques, en les comparant avec l'approche microscopique HFB-17. Actuellement, la masse des noyaux très exotiques peut seulement être prédite. L'étude de l'énergie de séparation de deux neutrons avec HFB-17 met en évidence des zones d'instabilité numérique. Afin de l'améliorer, nous avons apporté une correction aux énergies de déformation calculées par ce modèle, en utilisant comme référence les masses des chaînes isotopiques 143-146Xe et 223-229Rn que nous avons mesurées avec le spectromètre ISOLTRAP au CERN.Nuclear mass measurements give a direct determination of the binding energy, the result of all forces acting in the nucleus. The exploration of nuclear structure requires the measurement of masses far from stability. However the production of radioactive ions is not very selective and the ion of interest is often lost in a background of isobaric contaminants. The use of linear ion traps and buffer gas cooling has been highly developed in recent years, allowing mass measurement of exotic nuclei with high accuracy. This thesis focuses on the development of a novel circular Paul trap, "the ion circus". Its geometry allows confining ions during several turns. Thus, they can be cooled with a lower buffer gas pressure of about 10-4 mbar. Furthermore, during trapping and cooling, the ions may be mass separated with a resolving power sufficient to exclude isobaric contaminants. The first prototype was built and tested at Orsay. Currently, the mass of very exotic nuclei can only be predicted. This thesis also examines the prediction of different mass models by comparing them with the HFB-17 microscopic model. The study of the two-neutron separation energies of HFB-17 revealed numerical instability. To improve this, we have corrected the deformation energies calculated by this model, using as a reference the new isotopic chains 143-146Xe and 223-229Rn, measured with the ISOLTRAP spectrometer at CERN.ORSAY-PARIS 11-BU Sciences (914712101) / SudocSudocFranceF

Transport studies of low energy radioactive ion beams produced by photofission at ALTO-LEB

International audienceThe ALTO research platform at the Laboratoire de physique des 2 infinis Irène Joliot Curie (IJCLab) is dedicated to wide-ranging research in nuclear physics, nuclear astrophysics and interdisciplinary activities such as health physics. ALTO-LEB is the low energy beam area of ALTO where neutrons rich exotic nuclei are studied.A new precision experiment is being installed at the ALTOLEB facility : a double Penning trap mass spectrometer MLLTRAP coupled with a RadioFrequency Quadrupole Cooler and Buncher (RFQCB). This last device requires low energy beams with low emittance, low energy dispersion and with few contaminants. This paper focuses on the beam transport at ALTO-LEB, from the target-ion source vault to the RFQCB. Simulations of the ions extraction from the ion source and beam transport calculations are being presented in this work. Those results are also directly connected to the reliability of ALTO-LEB beam lines initiated at IJCLab in 2018

Charting Terra Incognita at Alto and S3

Charting Terra Incognita is a project grant that brings together the IPN Orsay, CSNSM Orsay and Irfu-SPHN laboratories around the common development of knowhow, equipment and techniques for mass spectrometry and nuclear spectroscopy at the low-energy branch of the new S3 spectrometer at Ganil, where likewise the Reglis set-up for intrajet laser spectroscopy is entering its final phase of construction. At the same time its concerted action initiates and sets the pace for the corresponding precursor physics programme at the Alto on-line isotope-separation facility, based on the photofission of uranium. We also collect a review of the Alto laser ion source, which is an essential instrument at any low-energy facility for the production of purified isotopic beams

Charting Terra Incognita at Alto and S3

Charting Terra Incognita is a project grant that brings together the IPN Orsay, CSNSM Orsay and Irfu-SPHN laboratories around the common development of knowhow, equipment and techniques for mass spectrometry and nuclear spectroscopy at the low-energy branch of the new S3 spectrometer at Ganil, where likewise the Reglis set-up for intrajet laser spectroscopy is entering its final phase of construction. At the same time its concerted action initiates and sets the pace for the corresponding precursor physics programme at the Alto on-line isotope-separation facility, based on the photofission of uranium. We also collect a review of the Alto laser ion source, which is an essential instrument at any low-energy facility for the production of purified isotopic beams

Data analysis of Q-value measurements for double-electron capture with SHIPTRAP

A measurement campaign has been carried out for the search for resonantly enhanced neutrinoless double-electron-capture transitions by the determination of the Q_εε -values with the SHIPTRAP Penning-trap mass spectrometer. The Q_εε -values have been determined by measuring the cyclotron-frequency ratios of the mother and daughter nuclides of the transitions. This article describes the experimental approach and the data analysis by the example of neutrinoless double-electron capture in ¹⁵² Gd. Various effects as, e.g., temporal fluctuations and spatial inhomogeneity of the magnetic field, or the variation of the ion number in the trap were found not to affect the frequency ratio on the 1 ppb-level, which is the present statistical uncertainty

Isotope dependence of the Zeeman effect in lithium-like calcium

The magnetic moment μ of a bound electron, generally expressed by the g-factor μ=−g μB s ħ−1 with μB the Bohr magneton and s the electron’s spin, can be calculated by bound-state quantum electrodynamics (BS-QED) to very high precision. The recent ultra-precise experiment on hydrogen-like silicon determined this value to eleven significant digits, and thus allowed to rigorously probe the validity of BS-QED. Yet, the investigation of one of the most interesting contribution to the g-factor, the relativistic interaction between electron and nucleus, is limited by our knowledge of BS-QED effects. By comparing the g-factors of two isotopes, it is possible to cancel most of these contributions and sensitively probe nuclear effects. Here, we present calculations and experiments on the isotope dependence of the Zeeman effect in lithium-like calcium ions. The good agreement between the theoretical predicted recoil contribution and the high-precision g-factor measurements paves the way for a new generation of BS-QED tests