Correlated analytical studies of organic material from the Tagish Lake carbonaceous chondrite

We report on correlated studies of organic material using SIMS, FIB-SEM, and TEM

Two-scale asymptotic homogenization in a MEMS auxetic structure for over etch identification

The development and optimization of Micro electro-mechanical systems (MEMS) devices, due to their small size scale, require testing and precise characterization. As an example, over etch, which is the deviation between the designed masks and the effective dimensions of the suspended parts, strongly influences the performances of MEMS; therefore, to predict the correct functioning of the device its actual value must be carefully identified. In this work, we propose an efficient, time-saving tool to identify fabrication imperfections in MEMS devices. In particular, we replace the complex geometry of a MEMS mechanical filter with an equivalent homogeneous medium, whose linear-elastic effective properties are evaluated employing two-scale asymptotic homogenization and we identify the over etch by minimizing the relative error between experimental data and corresponding predictions obtained for different combinations of over etch

Correlated Microscale Isotope and Scanning Transmission X-Ray Analyses of Isotopically Anomalous Organic Matter from the CR2 Chondrite EET 92042

We discuss correlated examinations of organic matter from the CR2 chondrite EET 92042, using SIMS, STXM and other methods. We found a large, isotopically highly anomalous region of probable presolar origin that is C- and 13C-poor and 15N-rich

Uji Beberapa Dosis Ekstrak Buah Mengkudu (Morinda Citrifolia L.) Terhadap Kadar Glukosa Darah Pada Tikus Wistar (Rattus Norvegicus) Yang Diinduksi Aloksan

: Herbal and natural products of folk medicine have been used for centuries in every culture throughout the world. One of folks medicine that has been used in Indonesia is the noni fruit. According to research conducted by I Ketut Adnyana, et al, there is a decrease in blood glucose levels from noni fruit extract with a dose of 500 mg/kg BW and 1000 mg/kg BW. This research aims to know the minimal dose of noni fruit (Morinda citrifolia L.) extract against a decrease in blood glucose levels in Wistar rats (Rattus norvegicus) induced alloxan. This study used 15 Wistar rats with diabetic induced by 130 mg/kg BW alloxan intraperitoneal. The rats were randomly divided into 5 groups; each group were given Aquades, Insulin Novomix 0,4 IU/100 gr BW, Noni fruit extract 125 mg/kg BW, 250 mg/kg BW, and 500 mg/kg BW. The result data obtained by the results of blood glucose levels evaluation on each rats on the first, second, and second day before the treatment after 6 hours, 12 hours, 18 hours, and 24 hours. Data from the measurement showed that noni fruit extracts with a dose of 125 mg/kg BW has the effect to lower blood glucose levels in Wistar rats induced alloxa

Correlated analyses of D- and 15N-rich carbon grains from CR2 chondrite EET 92042

Extract from introduction: Insoluble organic matter (IOM) and matrix from primitive carbonaceous chondrites carry isotope enrichments (?D?20000', ?15N?3200�) that are comparable to those in interplanetary dust particles [1, this work]. Hence, primitive organics that formed in the protosolar cloud (PSC) – or maybe in the cold outer regions of the protoplanetary disk – survived accretion and planetary processing on the asteroids, the parent bodies of the chondrites

Secondary ion mass spectrometry and x-ray absorption near-edge structure spectroscopy of isotopically anomalous organic matter from CR1 chondrites GRO 95577

We located interstellar organics from a CR1 chondrite with NanoSIMS and analyzed FIB-extracted sections with XANES. D-rich material appears not associated with a functional group, whereas 15N-rich matter shows some affinity to nitrile functionality

Determination of Interface Atomic Structure and Its Impact on Spin Transport Using Z-Contrast Microscopy and Density-Functional Theory

We combine Z-contrast scanning transmission electron microscopy with density-functional-theory calculations to determine the atomic structure of the Fe/AlGaAs interface in spin-polarized light-emitting diodes. A 44% increase in spin-injection efficiency occurs after a low-temperature anneal, which produces an ordered, coherent interface consisting of a single atomic plane of alternating Fe and As atoms. First-principles transport calculations indicate that the increase in spin-injection efficiency is due to the abruptness and coherency of the annealed interface.Comment: 16 pages (including cover), 4 figure

Integrated structure for a resonant micro-gyroscope and accelerometer

This paper presents the study of the mechanical behavior of a microstructure designed to detect acceleration and angular velocity simultaneously. The new resonant micro-sensor proposed, fabricated by the ThELMA© surface-micromachining technique, bases detection of two components of external acceleration (one in-plane component and one out-of plane component) and two components of angular velocity (roll and yaw) on the variation of frequency of several elements set in resonance. The device, despite its small dimensions, provides a differential decoupled detection of four external quantities thanks to the presence of four slender beams resonating in bending and four torsional resonators

Reciclaje de los residuos de la construcción y demolición en Argentina

La creciente conciencia medioambiental y los cada vez más escasos recursos naturales obligan a la migración de una economía lineal, basada en generar, consumir y descartar, a una circular donde los desechos pasen a integrar parte de la materia prima necesaria para los procesos de generación. Los esfuerzos en materia ambiental no resultan suficientes para mitigar el daño al ecosistema. Resulta necesario entonces un compromiso conjunto para abordar la temática entre todos los sectores involucrados. En particular los residuos de la construcción y demolición (RCD) han demostrado un gran potencial de reutilización en países con políticas claras y eficientes. Esto no sólo contribuye a mitigar el impacto ambiental de la industria de la construcción, sino que una gran cantidad de países han generado una economía secundaria al crear cooperativas que se ocupan de la clasificación y comercialización de los RCD. En nuestro país hay un fuerte vacío legal sobre la temática, no se disponen de estadísticas y los esfuerzos realizados son aislados. Es tiempo de tomar conciencia de la necesidad de realizar un uso inteligente de los recursos disponibles. Un análisis de la situación actual en Argentina respecto del tratamiento de los RCD desde el punto de vista normativo, ejemplos de la actividad (casos de estudios) y perspectivas a futuro de la gestión y valorización de los RCD son incluidos en este trabajo.The growing environmental awareness and the increasingly scarce natural resources become neediness the migration of a linear economy, based on generating, consuming and discarding, to a circular one where the waste integrate part of the raw material necessary for the generation processes. Efforts in environmental matters are not enough to mitigate the ecosystem damage. Therefore, it is necessary the compromise among all the sectors involved. In particular, in countries with clear and efficient environmental policies, construction and demolition waste (C&DW) has shown great potential for its reuse. This helps to mitigate the environmental impact of the construction industry, but a large number of countries have generated a secondary economy by creating cooperatives that deal with the classification and commercialization of the C&DWs. In our country there is no legislation on the subject, statistics are not available and the efforts made are isolated. It is time to become aware of the need to make intelligent use of available resources. In this work it is presented an analysis of the current situation in Argentina regarding the treatment of the C&DW from the normative point of view, examples of the activity (case studies) and future perspectives of the management and valorization of the C&DW