Are we overusing IVF?

Peer reviewedPublisher PD

La influencia de UBER como modelo de servicio en la preferencia de los usuarios del segmento B entre los 20-25 años de Ate Vitarte en el año 2018.

Al buscar en las tiendas de App que nos ofrecen los teléfonos móviles, el nombre de “UBER” en este navegador nos devuelve una gran cantidad de buenos comentarios. Frente a este buen número de comentarios, también aparece un notorio número de App’s, donde distinguimos la aparición de los sectores de Taxi. Como si se tratara de la venta de camisetas en los estadios, antes y después del evento deportivo, mucha variedad para elegir. Pero siempre al encontrar una buena opción dejas de lado otra, como en este caso sería la preferencia de App’s sobre el uso de taxis informales, casi habitual entre un fenómeno reciente de nuestra economía y un sector con muchos años a su espalda. Modernidad y tradición se enfrentan de nuevo, cuál enfrentamiento de animales hambrientos, algo que analizaremos en este documento, no es ningún fruto de casualidad

New ADS Functionality for the Curator

In this paper we provide an update concerning the operations of the NASA Astrophysics Data System (ADS), its services and user interface, and the content currently indexed in its database. As the primary information system used by researchers in Astronomy, the ADS aims to provide a comprehensive index of all scholarly resources appearing in the literature. With the current effort in our community to support data and software citations, we discuss what steps the ADS is taking to provide the needed infrastructure in collaboration with publishers and data providers. A new API provides access to the ADS search interface, metrics, and libraries allowing users to programmatically automate discovery and curation tasks. The new ADS interface supports a greater integration of content and services with a variety of partners, including ORCID claiming, indexing of SIMBAD objects, and article graphics from a variety of publishers. Finally, we highlight how librarians can facilitate the ingest of gray literature that they curate into our system.Comment: Submitted to the Proceedings of Library and Information Services in Astronomy VIII, Strasbourg, Franc

Compositional Analysis of Lignocellulosic Feedstocks. 2. Method Uncertainties

The most common procedures for characterizing the chemical components of lignocellulosic feedstocks use a two-stage sulfuric acid hydrolysis to fractionate biomass for gravimetric and instrumental analyses. The uncertainty (i.e., dispersion of values from repeated measurement) in the primary data is of general interest to those with technical or financial interests in biomass conversion technology. The composition of a homogenized corn stover feedstock (154 replicate samples in 13 batches, by 7 analysts in 2 laboratories) was measured along with a National Institute of Standards and Technology (NIST) reference sugar cane bagasse, as a control, using this laboratory's suite of laboratory analytical procedures (LAPs). The uncertainty was evaluated by the statistical analysis of these data and is reported as the standard deviation of each component measurement. Censored and uncensored versions of these data sets are reported, as evidence was found for intermittent instrumental and equipment problems. The censored data are believed to represent the “best case” results of these analyses, whereas the uncensored data show how small method changes can strongly affect the uncertainties of these empirical methods. Relative standard deviations (RSD) of 1−3% are reported for glucan, xylan, lignin, extractives, and total component closure with the other minor components showing 4−10% RSD. The standard deviations seen with the corn stover and NIST bagasse materials were similar, which suggests that the uncertainties reported here are due more to the analytical method used than to the specific feedstock type being analyzed

Effect of reactor irradiation on Santowax OM and WR

Statement of responsibility on title page reads: E.A. Mason, M.L. Lee, S.T. Brewer, and W.N. Bley"Issued: June, 1968."Includes bibliographical referencesM.I.T. DSR Project no. 79819Work performed for the New York Operations Office, U. S. Atomic Energy Commission under contract No. AT(38-1)-33

ACCUMULATION AND RETENTION OF TRITIUM (TRITIATED WATER) IN EMBRYONIC AND LARVAL FISH, AND RADIATION EFFECT.

This report addresses the accumulation and retention of tritium in embryonic and larval fish, and radiation effec

Polarization Dependence of Anomalous X-ray Scattering in Orbital Ordered Manganites

In order to determine types of the orbital ordering in manganites, we study theoretically the polarization dependence of the anomalous X-ray scattering which is caused by the anisotropy of the scattering factor. The general formulae of the scattering intensity in the experimental optical system is derived and the atomic scattering factor is calculated in the microscopic electronic model. By using the results, the X-ray scattering intensity in several types of the orbital ordering is numerically calculated as a function of azimuthal and analyzer angles.Comment: 9 pages, 7 figure

What lies beneath? The role of informal and hidden networks in the management of crises

Crisis management research traditionally focuses on the role of formal communication networks in the escalation and management of organisational crises. Here, we consider instead informal and unobservable networks. The paper explores how hidden informal exchanges can impact upon organisational decision-making and performance, particularly around inter-agency working, as knowledge distributed across organisations and shared between organisations is often shared through informal means and not captured effectively through the formal decision-making processes. Early warnings and weak signals about potential risks and crises are therefore often missed. We consider the implications of these dynamics in terms of crisis avoidance and crisis management