Sample records for mg tid group

  1. Supermennesket er vor tids ideal

    Brink, Dennis Meyhoff; Meyhoff, Karsten Wind


    Diagnose af vor tids samfunds som et mulighedssamfund modsat tidligere tiders mangelsamfund og fremstilling af den ideologi, der hersker i mulighedssamfundet, som en individualistisk ideologi om permanent selvudvikling....

  2. Supermennesket er vor tids ideal

    Brink, Dennis Meyhoff; Meyhoff, Karsten Wind


    Diagnose af vor tids samfunds som et mulighedssamfund modsat tidligere tiders mangelsamfund og fremstilling af den ideologi, der hersker i mulighedssamfundet, som en individualistisk ideologi om permanent selvudvikling....

  3. Tier identification (TID) for tiered memory characteristics

    Chang, Jichuan; Lim, Kevin T; Ranganathan, Parthasarathy


    A tier identification (TID) is to indicate a characteristic of a memory region associated with a virtual address in a tiered memory system. A thread may be serviced according to a first path based on the TID indicating a first characteristic. The thread may be serviced according to a second path based on the TID indicating a second characteristic.

  4. Sverre Moe: Tid – En social konstruksjon?

    Tække, Jesper


    Sverre Moe, der er professor i sociologi ved Universitetet i Stavanger, har skrevet bogen Tid – En social konstruksjon? Bogen udkom i december 2010 og har altså ligget og ventet på mit skrivebord i næsten et år, da det har været mig umuligt at nde tid til at få den læst og anmeldt før nu. Netop tid...

  5. Efficacy of pregabalin in the treatment of generalized anxiety disorder: double-blind, placebo-controlled comparison of BID versus TID dosing.

    Pohl, Robert B; Feltner, Douglas E; Fieve, Ronald R; Pande, Atul C


    Pregabalin is a new anxiolytic that acts as a presynaptic inhibitor of the release of excessive levels of excitatory neurotransmitters by selectively binding to the alpha2-delta subunit of voltage-gated calcium channels. The current study evaluated the anxiolytic efficacy of BID versus TID dosing of pregabalin in patients with generalized anxiety disorder. Outpatients with Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition generalized anxiety disorder and having baseline Hamilton Anxiety (HAM-A) total scores > or =20 were randomized to 6 weeks of double-blind treatment with pregabalin 200 mg/d (BID; N = 78), 400 mg/d (BID; N = 89), or 450 mg/d (TID; N = 88) or placebo (N = 86). Mean improvement in HAM-A total score at last observation carried forward end point was significantly greater on pregabalin 200 (P = 0.006), 400 (P = 0.001), and 450 mg/d (P = 0.005) compared with placebo. Pairwise comparisons of BID versus TID dosing found no difference in HAM-A change score at end point. All 3 pregabalin dosage groups showed significantly greater efficacy versus placebo at end point on the HAM-A psychic and somatic anxiety factor scores. Improvement on both factors was rapid: significance versus placebo was achieved as early as the first assessment at week 1, with > or =30% reduction in HAM-A severity and equal or greater improvement for every subsequent visit in > or =38% of patients in all 3 pregabalin dosage groups (P < or = 0.001). Pregabalin was well tolerated, and despite the fixed-dose study design, discontinuations caused by adverse events ranged from 9% to 13%--comparable with that observed with placebo (8%). This study demonstrates that pregabalin is an effective treatment of generalized anxiety disorder, with BID dosing showing similar efficacy and comparable tolerability with TID dosing.

  6. TidGen Power System Commercialization Project

    Sauer, Christopher R. [President & CEO; McEntee, Jarlath [VP Engineering & CTO


    ORPC Maine, LLC, a wholly-owned subsidiary of Ocean Renewable Power Company, LLC (collectively ORPC), submits this Final Technical Report for the TidGen® Power System Commercialization Project (Project), partially funded by the U.S. Department of Energy (DE-EE0003647). The Project was built and operated in compliance with the Federal Energy Regulatory Commission (FERC) pilot project license (P-12711) and other permits and approvals needed for the Project. This report documents the methodologies, activities and results of the various phases of the Project, including design, engineering, procurement, assembly, installation, operation, licensing, environmental monitoring, retrieval, maintenance and repair. The Project represents a significant achievement for the renewable energy portfolio of the U.S. in general, and for the U.S. marine hydrokinetic (MHK) industry in particular. The stated Project goal was to advance, demonstrate and accelerate deployment and commercialization of ORPC’s tidal-current based hydrokinetic power generation system, including the energy extraction and conversion technology, associated power electronics, and interconnection equipment capable of reliably delivering electricity to the domestic power grid. ORPC achieved this goal by designing, building and operating the TidGen® Power System in 2012 and becoming the first federally licensed hydrokinetic tidal energy project to deliver electricity to a power grid under a power purchase agreement in North America. Located in Cobscook Bay between Eastport and Lubec, Maine, the TidGen® Power System was connected to the Bangor Hydro Electric utility grid at an on-shore station in North Lubec on September 13, 2012. ORPC obtained a FERC pilot project license for the Project on February 12, 2012 and the first Maine Department of Environmental Protection General Permit issued for a tidal energy project on January 31, 2012. In addition, ORPC entered into a 20-year agreement with Bangor Hydro Electric

  7. TID measurement using oblique transmissions of HF pulses

    Galkin, Ivan; Reinisch, Bodo; Huang, Xueqin; Paznukhov, Vadym; Hamel, Ryan; Kozlov, Alexander; Belehaki, Anna


    The Traveling Ionospheric Disturbance (TID), a wave-like signature of moving plasma density modulation in the ionosphere, is widely acknowledged for its utility in backtracking the anomalous events responsible for the TID generation, and as a major inconvenience to high-frequency (HF) operational systems because of its deleterious impact on the accuracy of navigation and geolocation. The pilot project "Net-TIDE" for the real-time detection and evaluation of TIDs began its operation in 2016 based on the remote-sensing data from synchronized, network-coordinated HF sounding between pairs of DPS4D ionosondes at five participating observatories in Europe. Measurement of all signal properties (Doppler frequency, angle of arrival, and time-of-flight from transmitter to receiver) proved to be instrumental in detecting the TID and deducing the TID parameters: amplitude, wavelength, phase velocity, and direction of propagation. Processing of the measured HF signal data required a specialized signal processing technique that is capable of consistently extracting different signals that have propagated along different ionospheric paths. The multi-path signal environment proved to be the greatest challenge for the reliable TID specification by Net-TIDE, demanding the development of an intelligent system for "signal tracking". The intelligent system is based on a neural network model of a pre-attentive vision capable of extracting continuous signal tracks from the multi-path signal ensemble. Specific examples of the Net-TIDE algorithm suite operation and its suitability for a fully automated TID warning service are discussed.

  8. Design of CMOS logic gates for TID radiation

    Attia, John Okyere; Sasabo, Maria L.


    The rise time, fall time and propagation delay of the logic gates were derived. The effects of total ionizing dose (TID) radiation on the fall and rise times of CMOS logic gates were obtained using C program calculations and PSPICE simulations. The variations of mobility and threshold voltage on MOSFET transistors when subjected to TID radiation were used to determine the dependence of switching times on TID. The results of this work indicate that by increasing the size of P-channel transistor with respect to the N-channel transistors of the CMOS gates, the propagation delay of CMOS logic gate can be made to decrease with, or be independent of an increase in TID radiation.

  9. Compensation for TID Damage in SOI Pixel Devices

    Tobita, Naoshi; Hara, Kazuhiko; Aoyagi, Wataru; Arai, Yasuo; Miyoshi, Toshinobu; Kurachi, Ikuo; Hatsui, Takaki; Kudo, Togo; Kobayashi, Kazuo


    We are investigating adaption of SOI pixel devices for future high energy physic(HEP) experiments. The pixel sensors are required to be operational in very severe radiation environment. Most challenging issue in the adoption is the TID (total ionizing dose) damage where holes trapped in oxide layers affect the operation of nearby transistors. We have introduced a second SOI layer - SOI2 beneath the BOX (Buried OXide) layer - in order to compensate for the TID effect by applying a negative voltage to this electrode to cancel the effect caused by accumulated positive holes. In this paper, the TID effects caused by Co gamma-ray irradiation are presented based on the transistor characteristics measurements. The irradiation was carried out in various biasing conditions to investigate hole accumulation dependence on the potential configurations. We also compare the data with samples irradiated with X-ray. Since we observed a fair agreement between the two irradiation datasets, the TID effects have been investigated...

  10. Vestlig tænkning og tidsånd

    Keldorff, Søren; Olsen, Jan Brødslev


    Om relationen mellem forskningsparadigmer og tidsånd, og hvordan de spejler hinanden. Om hvad der bevæger udviklingen i videnskaberne, og hvorfor det tilsyneladende ikke længere giver mening for forskere og deres studerende at erkende og afsløre de dybereliggende lag i samfundet og mennesker. I s...

  11. Tegnets tid. Fortid, historie og historicitet efter den sproglige vending

    Simonsen, Dorthe Gert

    historieskrivningens sandhedsfordring. Her ud fra forskydes det snævre fokus på tegn, tekst og diskurs i den aktuelle historieteoretiske debat til spørgsmål om tid og “radikal historicitet”. Der indhentes eksempler fra nyere kulturhistorisk forskning, især fra den amerikanske New Historicism....

  12. Simultaneous storm time equatorward and poleward large-scale TIDs on a global scale

    Habarulema, John Bosco; Katamzi, Zama Thobeka; Yizengaw, Endawoke; Yamazaki, Yosuke; Seemala, Gopi


    We report on the first simultaneous observations of poleward and equatorward traveling ionospheric disturbances (TIDs) during the same geomagnetic storm period on a global scale. While poleward propagating TIDs originate from the geomagnetic equator region, equatorward propagating TIDs are launched from the auroral regions. On a global scale, we use total electron content observations from the Global Navigation Satellite Systems to show that these TIDs existed over South American, African, and Asian sectors. The American and African sectors exhibited predominantly strong poleward TIDs, while the Asian sector recorded mostly equatorward TIDs which crossed the geomagnetic equator to either hemisphere on 9 March 2012. However, both poleward and equatorward TIDs are simultaneously present in all three sectors. Using a combination of ground-based magnetometer observations and available low-latitude radar (JULIA) data, we have established and confirmed that poleward TIDs of geomagnetic equator origin are due to ionospheric electrodynamics, specifically changes in E × B vertical drift after the storm onset.

  13. TID Test Results for 4th Generation iPad(TradeMark)

    Guertin, S. M.; Allen, G. R.; McClure, S. S.; LaBel, K. A.


    TID testing of 4th generation iPads is reported. Of iPad subsystems, results indicate that the charging circuitry and display drivers fail at lowest TID levels. Details of construction are investigated for additional testing of components.

  14. TID Simulation of Advanced CMOS Devices for Space Applications

    Sajid, Muhammad


    This paper focuses on Total Ionizing Dose (TID) effects caused by accumulation of charges at silicon dioxide, substrate/silicon dioxide interface, Shallow Trench Isolation (STI) for scaled CMOS bulk devices as well as at Buried Oxide (BOX) layer in devices based on Silicon-On-Insulator (SOI) technology to be operated in space radiation environment. The radiation induced leakage current and corresponding density/concentration electrons in leakage current path was presented/depicted for 180nm, 130nm and 65nm NMOS, PMOS transistors based on CMOS bulk as well as SOI process technologies on-board LEO and GEO satellites. On the basis of simulation results, the TID robustness analysis for advanced deep sub-micron technologies was accomplished up to 500 Krad. The correlation between the impact of technology scaling and magnitude of leakage current with corresponding total dose was established utilizing Visual TCAD Genius program.

  15. Method for Improving Mg Doping During Group-III Nitride MOCVD

    Creighton, J. Randall; Wang, George T.


    A method for improving Mg doping of Group III-N materials grown by MOCVD preventing condensation in the gas phase or on reactor surfaces of adducts of magnesocene and ammonia by suitably heating reactor surfaces between the location of mixing of the magnesocene and ammonia reactants and the Group III-nitride surface whereon growth is to occur.

  16. Kirsten Sand. Arkitekt for sin tid

    Elisabeth Seip


    Full Text Available Towards the end of World War II the retreating Germans burnt down nearly all buildings and other constructions in the counties of Finnmark and the northern parts of Troms in North Norway. The population evacuated but many returned as soon as possible, only to find themselves homeless. At this very demanding point Kirsten Sand decided to travel north, and do whatever she could as an architect to help. The pre-war housing situation was generally difficult. Low building standards and lack of money forced families in the cities to live under bad conditions. Kirsten Sand studied these conditions and took part in the efforts to better the situation. This knowledge provided a good starting point for the work she undertook after the war, in particular her profound understanding of the situation of women, their working conditions and positions in the household and society. Houses designed by Sand and her helpmates are simple but adequate, taking into account these women’s point of view. Ingebjørg Hage has thrown light on the work of Kirsten Sand in Finnmark and Troms in several ways. This article aims at describing Sand’s background as an architect before she left Oslo to travel north. It describes how housing and housing policy since long had been central to architects, especially so within the group she belonged to. In pre-war Oslo she had been engaged in planning and designing hospitals. During a period as inspector for the health authorities she learned a lot about the living conditions of people in general. After establishing her own architect’s office she mostly designed family houses, and during the war she engaged in research that further deepened her knowledge in the field. Thus she was particularly well equipped for the demanding tasks she undertook in the summer of 1945.

  17. TID-Effect Compensation and Sensor-Circuit Cross-Talk Suppression in Double-SOI Devices

    Honda, Shunsuke; Sekigawa, Daisuke; Subedi, Bipin; Asano, Mari; Tobita, Naoshi; Aoyagi, Wataru; Arai, Yasuo; Ishikawa, Akimasa; Ono, Yoshimasa; Ushiki, Itaru


    We are developing double silicon-on-insulator (DSOI) pixel sensors for various applications such as for high-energy experiments. The performance of DSOI devices has been evaluated including total ionization damage (TID) effect compensation in transistors using a test-element-group (TEG) up to 2 MGy and in integration-type sensors up to 100 kGy. In this article, successful TID compensation in a pixel-ASD-readout-circuit is shown up to 100 kGy for the application of DSOI to counting-type sensors. The cross-talk suppression in DSOI is being evaluated. These results encourage us that DSOI sensors are applicable to future high-energy experiments such as the BELLE-II experiment or the ILC experiment.

  18. A simplified traveling ionospheric disturbance (TID) specification model based on TID Detector Built In Texas (TIDDBIT) and GPS total electron content (TEC) measurements.

    Duly, T. M.; Crowley, G.; Azeem, I.


    There is currently a great deal of interest in Traveling Ionospheric Disturbances (TIDs) from both an observational and modeling perspective, especially as they apply to operational systems that rely on nowcasting the ionospheric state. ASTRA has developed a new observational system to measure TID characteristics called TIDDBIT (TID Detector Built in Texas). TIDDBIT is a fully digital HF Doppler sounder that uses CW signals across a spaced array. TIDDBIT systems have been deployed in Texas, Virginia, Florida, Hawaii, and Peru. TIDDBIT measures the entire wave packet, including the horizontal and vertical phase propagation speeds as a function of TID period from the acoustic (1-min) to the gravity wave (10-90 min) part of the spectrum. It is desirable to be able to use these data to specify the TID structure not only at the measurement height, but to extend it in 3D to greater and lower heights, and beyond the immediate vicinity of the TIDDBIT system. We present a simplified model to specify TIDs based on the ion continuity equation for plasma density (Hooke 1970). Linearity of the neutral wind perturbations is assumed, and the different spectral components of the measured TID perturbations are added linearly. We use TID observations from the TIDDBIT sounder in Virginia and Peru as input into the model, and develop a 4D regional specification (spanning ~500 x 500 km in the horizontal direction and 90-1000 km altitude range) of both the perturbed electron density and the perturbed neutral wind from the corresponding atmospheric gravity wave (AGW). The model is also applied to TID measurements derived by GPS TEC measurements from the continental United States during the 11 March 2011 Tohoku Earthquake to study the theoretical launch angle of AGWs from the west coast of the United States.

  19. TID-dependent current measurements of IBL readout chips

    Dette, Karola [TU Dortmund, Experimentelle Physik IV (Germany); CERN (Switzerland); Collaboration: ATLAS Pixel-Collaboration


    The ATLAS detector consists of several subsystems with a hybrid pixel detector as the innermost component of the tracking system. The pixel detector has been composed of three layers of silicon sensor assemblies during the first data taking run of the LHC and has been upgraded with a new 4th layer, the so-called Insertable B-Layer (IBL), in summer 2014. Each silicon sensor of the IBL is connected to a Front End readout chip (FE-I4) via bump bonds. During the first year of data taking an increase of the LV current produced by the readout chips was observed. This increase could be traced back to radiation damage inside the silicon. The dependence of the current on the Total Ionizing Dose (TID) and temperature has been tested with X-ray irradiations and will be presented in this talk.

  20. A platform for TID testing of diodes and transistors

    Goncalez, Odair L., E-mail: [Instituto de Estudos Avancados (IEAv/DCTA), Sao Jose dos Campos, SP (Brazil); Vaz, Rafael G., E-mail: [Instituto Tecnologico da Aeronautica (DCTA/ITA), Sao Jose dos Campos, SP (Brazil); Wirth, Gilson, E-mail: [Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS (Brazil)


    The development of any project aimed at space or aeronautical applications in high-altitude flights must consider the undesirable effects of the continuous action of ionizing radiation in materials and components. The effects of this radiation must be known, in a way that corrective actions can be considered in the design of equipment that must operate for long-time intervals in an environment with permanent ionizing radiation. Electronic instruments operating under ionizing radiation suffer adverse effects on its performance, resulting from the interaction of radiation with their basic components. In electronic circuits, these effects appear as transient or permanent deviations of electrical parameters of the circuit, malfunction or even complete failure of the system. In order to perform irradiation surveys for measuring total ionization dose effects (TID) it was proposed a test platform. It was designed for batch testing, allowing to test up to ten samples of analog devices of the same type in each batch. This work reports the results of some measurements of parametric variations induced by accumulated dose in Commercial Off The Shelf (COTS) diodes and transistors usually employed in general purpose electronic circuits with potential for space deployment. The irradiations were carried out with 1.17 and 1.33 MeV gamma-rays from a {sup 60}Co radioactive source at Instituto de Estudos Avancados irradiation facility following international standards for spatial qualification. (author)

  1. Statistical Techniques for Analyzing Process or "Similarity" Data in TID Hardness Assurance

    Ladbury, R.


    We investigate techniques for estimating the contributions to TID hardness variability for families of linear bipolar technologies, determining how part-to-part and lot-to-lot variability change for different part types in the process.

  2. Sådan klarer en progressiv sig i en mørk tid

    Ibsen, Malte Frøslee


    Der er stor forskel på at være progressiv i en progressiv tid – og at være det i en tid, hvor mørket sænker sig, og fortvivlelsen truer med at stå i vejen for vreden og handlingen. Fem dyder, den progressive skal til at lære sig oven på Trumps sejr i USA......Der er stor forskel på at være progressiv i en progressiv tid – og at være det i en tid, hvor mørket sænker sig, og fortvivlelsen truer med at stå i vejen for vreden og handlingen. Fem dyder, den progressive skal til at lære sig oven på Trumps sejr i USA...

  3. TID and SEE Response of an Advanced Samsung 4G NAND Flash Memory

    Oldham, Timothy R.; Friendlich, M.; Howard, J. W.; Berg, M. D.; Kim, H. S.; Irwin, T. L.; LaBel, K. A.


    Initial total ionizing dose (TID) and single event heavy ion test results are presented for an unhardened commercial flash memory, fabricated with 63 nm technology. Results are that the parts survive to a TID of nearly 200 krad (SiO2), with a tractable soft error rate of about 10(exp -l2) errors/bit-day, for the Adams Ten Percent Worst Case Environment.

  4. Analysis of traveling ionospheric disturbances (TIDs) in GPS TEC launched by the 2011 Tohoku earthquake

    Crowley, Geoff; Azeem, Irfan; Reynolds, Adam; Duly, Timothy M.; McBride, Patrick; Winkler, Clive; Hunton, Don


    Traveling ionospheric disturbances (TIDs) have been detected using various measurement techniques, including HF sounders, incoherent scatter radars, in situ measurements, and optical techniques. However, observations of TIDs have tended to be sparse and there is a need for additional observations to provide new scientific insight into the geophysical source phenomenology and wave propagation physics. The dense network of GPS receivers around the globe offers a relatively new data source to observe and monitor TIDs. In this paper, we use total electron content (TEC) measurements from ~4000 GPS receivers throughout the continental United States to observe TIDs associated with the 11 March 2011 Tohoku tsunami. The tsunami propagated across the Pacific to the U.S. west coast over several hours, and we show that corresponding TIDs were observed in the US. Using this network of GPS receivers we present a 2D imaging of TEC perturbations and calculate various TID parameters, including horizontal wavelength, speed, and period. Well-formed, planar TIDs were detected over the west coast of the U.S. ~10 h after the earthquake. Fast Fourier transform analysis of the observed waveforms revealed that the period of the wave was 15.1 min with a horizontal wavelength of 194.8 km, phase velocity of 233.0 m/s, and an azimuth of 105.2° (propagating nearly due east in the direction of the tsunami wave). These results are consistent with the TID observations in airglow measurements from Hawaii earlier in the day and with other GPS TEC observations.

  5. TiD: Standalone software for mining putative drug targets from bacterial proteome.

    Gupta, Reena; Pradhan, Dibyabhaba; Jain, Arun Kumar; Rai, Chandra Shekhar


    TiD is a standalone application, which relies on basic assumption that a protein must be essential for pathogens survival and non-homologous with host to qualify as putative target. With an input bacterial proteome, TiD removes paralogous proteins, picks essential ones, and excludes proteins homologous with host organisms. The targets illustrate non-homology with at least 40 out of 84 gut microbes, considered safe for human. TiD classifies proposed targets as known, novel and virulent. Users can perform pathway analysis, choke point analysis, interactome analysis, subcellular localization and functional annotations through web servers cross-referenced with the application. Drug targets identified by TiD for Listeria monocytogenes, Bacillus anthracis and Pseudomonas aeruginosa have revealed significant overlaps with previous studies. TiD takes <2h to scan putative targets from a bacterial proteome with ~5000 proteins; hence, we propose it as a useful tool for rational drug design. TiD is available at Copyright © 2016 Elsevier Inc. All rights reserved.

  6. NMR and IR studies of hydroxyl groups in CaNa and MgNa forms of zeolites A

    Pruski, M.; Ernst, H.; Pfeifer, H.; Staudte, B.


    By measurement of MAS proton magnetic resonance and near-infrared spectra, the existence of bridging hydroxyl groups in MgNaA and CaNaA zeolites is excluded. The MAS proton magnetic resonance lines observed at 2.5-3 ppm for CaNaA and at 3.5 ppm for MgNaA (apart from the small contributions of "terminal" OH groups) and the corresponding bands at 4576 and 4525 cm -1 in the near-infrared spectra are attributed to hydroxyl groups attached to the exchangeable cations.

  7. Statistical Angle-of-Arrival and Doppler Method for GPS Radio Interferometry of TIDS

    Afraimovich, E. L.; Palamartchouk, K. S.; Perevalova, N. P.

    A Statistical Angle-of-arrival and Doppler Method for GPS radio interferometry (SADM-GPS) is proposed for determining the characteristics of the Travelling Ionospheric Disturbances (TIDs) by measuring variations of GPS phase derivatives with respect to time and spatial coordinates. These data are used to calculate corresponding values of the velocity vector, in view of a correction for satellite motion based on current information available regarding the angular coordinates of the satellites. Through a computer simulation it was shown that multi satellite GPS radio interferometry in conjunction with the SADM-GPS algorithm allows for detecting and measuring the velocity vector of TIDs in virtually the entire azimuthal range of possible TID propagation directions

  8. TiD - Introducing and Benchmarking an Event-Delivery System for Brain-Computer Interfaces.

    Breitwieser, Christian; Tavella, Michele; Schreuder, Martijn; Cincotti, Febo; Leeb, Robert; Muller-Putz, Gernot R


    In this paper, we present and analyze an event distribution system for brain-computer interfaces (BCIs). Events are commonly used to mark and describe incidents during an experiment and are therefore critical for later data analysis or immediate real-time processing. The presented approach, called TiD (Tools for brain-computer interaction - interface D), delivers messages in XML format via a bus-like system using TCP (transmission control protocol) connections or shared memory. A dedicated server dispatches TiD messages to distributed or local clients. The TiD message is designed to be flexible and contains time stamps for event synchronization, whereas events describe incidents which occur during an experiment. TiD was tested extensively towards stability and latency. The effect of an occurring event jitter was analyzed and benchmarked on a reference implementation under different conditions as GBit and 100 MBit Ethernet or WiFi with a different number of event receivers. A 3 dB signal attenuation, which occurs when averaging jitter influenced trials aligned by events, is starting to become visible at around 1-2 kHz in case of a GBit connection. Mean event distribution times across operating systems are ranging from 0.3 ms to 0.5 ms for aGBit network connection for 106 events. Results for other environmental conditions are available in the paper. References already using TiD for event distribution are provided showing the applicability of TiD for event delivery with distributed or local clients.

  9. TID and I-TD controller design for magnetic levitation system using genetic algorithm

    Debdoot Sain


    Full Text Available This article is about the design of controllers for magnetic levitation (Maglev system in both simulation and real time. Local linearization around the equilibrium point has been done for the nonlinear Maglev system to obtain a linearized model transfer function. In this study, the design of integral-tilted-derivative (I-TD controller has been proposed for the Maglev system and its performance is compared with conventional tilted-integral-derivative (TID controller. In this study, TID controller parameters have been optimized through genetic algorithm (GA and those set of values have been employed for the design of I-TD controller. A performance comparison between TID and I-TD controller is then investigated. The analysis shows the superiority of I-TD controller over TID controller in terms of maximum overshoot, gain margin and phase margin. The settling time remains almost same in both the cases. In future, a detailed study of robustness in presence of model uncertainties will be incorporated as a scope of further research.

  10. High frequency based detection of TIDs in the Net-TIDE project: challenges and opportunities for long HF paths

    Verhulst, Tobias


    Travelling Ionospheric Disturbances (TIDs) are the ionospheric signatures of atmospheric gravity waves. TIDs carry along information about their sources of excitations which may be either natural (energy input from the auroral region, earthquakes/tsunamis, hurricanes, solar terminator, and others) or artificial (ionospheric modification experiments, nuclear explosions, and other powerful blasts like industrial accidents). TIDs contribute to the energy and momentum exchange between different regions of the ionosphere, especially during geomagnetic storms. Their tracking is important because the TIDs affect all services that rely on predictable ionospheric radio wave propagation. Although a number of methods have been proposed to measure TID characteristics, none is able to operate in real time for monitoring purposes. In the framework of a new NATO Science for Peace and Security multi-year project (2014--2017) we are exploiting for the first time the European network of high precision ionospheric DPS4D sounders and the related software to directly identify TIDs over Europe and specify in real-time the gravity wave parameters based on measuring the variations of the angles-of-arrival and Doppler frequencies of ionospherically reflected HF radio signals. The project will run until 2017 and is expected to result in a pilot network of DPS4D ionospheric sounders in Europe, enhanced with a system to process the TID observations for real-time diagnostics and issue warnings for TIDs and the potential disturbance over the area. Based on these warnings the end-users can put in action specific mitigation techniques to protect their systems. The technical challenges of operating long distance ionospheric HF radio links for the detection of TIDs will be discussed.

  11. Observations of Traveling Ionospheric Disturbances (TIDs) Over the United States Associated With the Tsunami Generated by the 2011 Tohoku Earthquake

    Duly, T. M.; Azeem, I.; Crowley, G.; Vadas, S.; Makela, J. J.; Reynolds, A.


    The March 11, 2011 Tohoku earthquake generated a massive tsunami off the Pacific coast of Japan which in turn forced intense atmospheric gravity waves (AGW) that were seen in GPS Total Electron Content (TEC) data and airglow measurements as traveling ionospheric disturbance (TID) signatures as far away as Hawaii. What is unknown is how far these TIDs traveled after being launched by the tsunami and the role of the underlying neutral atmosphere on their propagation characteristics. For the first time, we show that TIDs associated with the Tohoku tsunami were observed in GPS TEC data for several hours over the west coast of the US and as far inland as Colorado. The results presented here show a range of TIDs generated by gravity wave packets propagating into the ionosphere from below. We present results indicating the presence of TIDs with periods ranging from 15 to 30 minutes, and horizontal wavelengths from 150 km to 400 km. The azimuth of the observed TID wave train was 121.8 ± 1.8° (angle measured in degrees east of north), which matches the azimuth of the tsunami near the Pacific coast of the US. The observed period of the TIDs was one of the spectral components of the tsunami wave packet as it approached the Pacific coast of the US. These results suggest that the tsunami was the source of the TIDs over the US. Additionally, the TID periods and horizontal wavelengths clearly vary in longitude. These variations agree with theoretical gravity wave results concerning propagation and dissipation in the thermosphere.

  12. Tanker om tid og rum - eller det spatio-temporale univers

    Brande-Lavridsen, Hanne


    Begrebet rum eller rumlig har vi alle en mening om, specielt os, der arbejder med stedfæstede (geografiske) data. Begrebet tid er imidlertid ikke så entydigt. Gennem historien har forskellige videnskabelige retninger forsøgt at komme med en definition på tidsbegrebet, hver fra sit synspunkt; et...... historisk, et religiøst, et naturvidenskabeligt, et filosofisk osv. Endnu er det ikke lykkedes videnskaben at komme frem til en entydig, tværfaglig definition. Vi har således alle vor egen opfattelse af, hvad tid er, og kan også forholde os til tiden, men det er straks sværere at forklare tidsbegrebet...

  13. Hvordan spilder vi børns tid på en nyttig måde?

    Holm, Claus


    Forstå at spilde tid for at vinde tid! Dette gode gamle råd kommer fra filosoffen Jean-Jacques Rousseau, og regeringen kan med fordel følge det, når den reviderer den pædagogiske læreplan for de nul- til seksårige børn......Forstå at spilde tid for at vinde tid! Dette gode gamle råd kommer fra filosoffen Jean-Jacques Rousseau, og regeringen kan med fordel følge det, når den reviderer den pædagogiske læreplan for de nul- til seksårige børn...

  14. Superspace description of wagnerite-group minerals (Mg,Fe,Mn)2(PO4)(F,OH).

    Lazic, Biljana; Armbruster, Thomas; Chopin, Christian; Grew, Edward S; Baronnet, Alain; Palatinus, Lukas


    Reinvestigation of more than 40 samples of minerals belonging to the wagnerite group (Mg, Fe, Mn)2(PO4)(F,OH) from diverse geological environments worldwide, using single-crystal X-ray diffraction analysis, showed that most crystals have incommensurate structures and, as such, are not adequately described with known polytype models (2b), (3b), (5b), (7b) and (9b). Therefore, we present here a unified superspace model for the structural description of periodically and aperiodically modulated wagnerite with the (3+1)-dimensional superspace group C2/c(0β0)s0 based on the average triplite structure with cell parameters a ≃ 12.8, b ≃ 6.4, c ≃ 9.6 Å, β ≃ 117° and the modulation vectors q = βb*. The superspace approach provides a way of simple modelling of the positional and occupational modulation of Mg/Fe and F/OH in wagnerite. This allows direct comparison of crystal properties.

  15. Platinum-group minerals in the LG and MG chromitites of the eastern Bushveld Complex, South Africa

    Oberthür, Thomas; Junge, Malte; Rudashevsky, Nikolay; de Meyer, Eveline; Gutter, Paul


    The chromitites of the Bushveld Complex in South Africa contain vast resources of platinum-group elements (PGE); however, except for the economic upper group (UG)-2 chromitite seam, information on the distribution of the PGE in the ores and on the mineralogical nature, assemblages, and proportions of platinum-group minerals (PGM) is essentially missing. In the present geochemical and mineralogical study, PGE concentrates originating from the lower group (LG)-6 and middle group (MG)-1/2 chromitites were investigated with the intention to fill this gap of knowledge. Chondrite-normalized PGE patterns of bulk rock and concentrates are characterized by a positive slope from Os to Rh, a slight drop to Pt, and an increase to Pd again. The pronounced similarities of the PGE patterns indicate similar primary processes of PGE concentration in the chromitites, namely "sulfide control" of the PGE mineralization, i.e., co-precipitation of chromite and sulfide. Further, the primary control of PGE concentration in chromitites appears to be dual in character: (i) base-level concentrations of IPGE (up to ˜500 ppb) hosted within chromite and (ii) co-precipitation of chromite and sulfide, the latter containing virtually the entire remaining PGE budget. Sulfides (chalcopyrite, pentlandite, and pyrite; pyrrhotite is largely missing) are scarce within the chromitites and occur mainly interstitial to chromite grains. Pd and Rh contents in pentlandite are low and erratic. Essentially, the whole PGE inventory of the ores occurs in the form of discrete PGM. The PGM are almost always associated with sulfides. The dominant PGM are various Pt-Pd-Rh sulfides (cooperite/braggite [(Pt,Pd)S] and malanite/cuprorhodsite [CuPt2S4]/[CuRh2S4]), laurite [RuS2], the main carrier of the IPGE (Os, Ir, Ru), sulfarsenides [(Rh,Pt,Ir)AsS], sperrylite [PtAs2], Pt-Fe alloys, and a large variety of mainly Pd-rich PGM. The LG and MG chromitites have many characteristics in common and define a general, "typical

  16. Provenance and sedimentary analysis of the basal portion of the Bambuí Group at Arcos (MG

    Matheus Kuchenbecker


    Full Text Available The origin and evolution of Bambuí Basin has been a matter of debate, in much intensified by the recent exploratory efforts carried out by public and private companies looking for natural gas. In the southeastern portion of the basin there are rare opportunities to access the contact between the sedimentary rocks and its basement, whose characteristics are crucial to understanding the processes of basin installation and the early sedimentation. The analysis of drill cores allowed us to describe the lowermost Bambuí Group in Arcos (MG region, including its basement. The sampled section displays as basement an archean granodiorite (ca. 2.8 – 2.9 Ga, fractured at the time of sedimentation. The Bambuí Group basal unit is dm-thick, massive lodgment tillite. Grains of zircon separated from the tillite matrix were dated and show a main age peak at ca. 2.8 Ga, indicating provenance from the own basement. On the tillite rests an impure limestone that passes gradually to a muddy unit, in a retrogradational filling trend. Terrigenous fragments in the impure limestone suggests that the basement has continued to be a source of sediments in the bottom of the section. The pelitic rocks that occurs to the top has a litochemical signature compatible with acidic source rocks, and shows Sm-Nd model ages of 1.7 Ga. These data suggests that rocks from the Brasília Belt have acted as a source for the pelitic rocks, supporting the interpretation of a foreland set for the basin.

  17. Single Event Transient and TID Study in 28 nm UTBB FDSOI Technology

    Liu, Rui; Evans, Adrian; Chen, Li; Li, Yuanqing; Glorieux, Maximilien; Wong, Richard; Wen, Shi-Jie; Cunha, Joao; Summerer, Leopold; Ferlet-Cavrois, Véronique


    Measuring single-event transient (SET) pulse widths is critical for developing proper mitigation schemes to single-event effects (SEE), especially for advanced technologies. This paper presents a test chip design implementing advanced techniques for measuring SETs implemented in a 28 nm Ultra-Thin Body and Box (UTBB) FDSOI technology. Experimental results of heavy ion and Co-60 irradiation experiments are presented. The heavy ion experiments confirm that this technology has very low SEE sensitivity. Laser test results show that pulse distortion (broadening) plays a key role when evaluating the effect of SETs. Total Ionizing Dose (TID) effects were also evaluated by measuring the Ring Oscillator (RO) frequencies and static current during heavy ion and Co-60 irradiation. Experimental results showed that the RO frequencies degraded up to 10% (heavy ion), and 40% (Co-60) after 1000 krad(Si) irradiation, but the logic in the chip functioned without error.

  18. Hydrogen adsorption on Be, Mg, Ca and Sr doped graphenes: The role of the dopant in the IIA main group

    Luo, Huijuan; Li, Hejun; Fu, Qiangang


    Hydrogen (H2) adsorption on the IIA elements doped double-vacancy graphenes (BeG, MgG, CaG and SrG) was studied by using dispersion-corrected density functional theory calculations. Through investigation of different numbers of hydrogen dockings from two directions, it is found that 1H2/BeG, 1H2/MgG, 8H2/CaG and 8H2/SrG are the most stable adsorption configurations for Be, Mg, Ca and Sr doped graphenes, respectively. Atomic radius, electronegativity and ionization potential of the IIA dopant contribute to the dominating adsorption mechanism under specific H2 concentration. The study would facilitate exploration of high performance graphene-related supports for hydrogen storage.

  19. Development and Initial Validation of the NyTid Test: A Movement Assessment Tool for Compulsory School Pupils

    Tidén, Anna; Lundqvist, Carolina; Nyberg, Marie


    This study presents the development process and initial validation of the NyTid test, a process-oriented movement assessment tool for compulsory school pupils. A sample of 1,260 (627 girls and 633 boys; mean age of 14.39) Swedish school children participated in the study. In the first step, exploratory factor analyses (EFAs) were performed in…

  20. Ferromagnetism in IV main group element (C and transition metal (Mn doped MgO: A density functional perspective

    Vinit Sharma


    Full Text Available The formation of magnetic moment due to the dopants with p-orbital (d-orbital is named d0 (d − magnetism, where the ion without (with partially filled d states is found to be responsible for the observed magnetic properties. To study the origin of magnetism at a fundamental electronic level in such materials, as a representative case, we theoretically investigate ferromagnetism in MgO doped with transition metal (Mn and non-metal (C. The generalized gradient approximation based first-principles calculations are used to investigate substitutional doping of metal (Mn and non-metal (C, both with and without the presence of neighboring oxygen vacancy sites. Furthermore, the case of co-doping of (Mn, C in MgO system is also investigated. It is observed that the oxygen vacancies do not play a role in tuning the ferromagnetism in presence of Mn dopants, but have a significant influence on total magnetism of the C doped system. In fact, we find that in MgO the d0 magnetism through C doping is curtailed by pairing of the substitutional dopant with naturally occurring O vacancies. On the other hand, in case of (Mn, C co-doped MgO the strong hybridization between the C (2p and the Mn(3d states suggests that co-doping is a promising approach to enhance the ferromagnetic coupling between the nearest-neighboring dopant and host atoms. Therefore, (Mn,C co-doped MgO is expected to be a ferromagnetic semiconductor with long ranged ferromagnetism and high Curie temperature.

  1. Randomised study of Casodex 50 MG monotherapy vs orchidectomy in the treatment of metastatic prostate cancer. The Scandinavian Casodex Cooperative Group

    Iversen, P; Tveter, K; Varenhorst, E


    The effect of Casodex (ICI 176,334), a new, once-daily, selective antiandrogen, given as 50 mg monotherapy, was compared with orchidectomy in a randomised, multicentre, open study in 376 patients with metastatic prostate cancer. At 3 months, PSA was reduced by 86% in the Casodex group and by 96% ...

  2. Randomised study of Casodex 50 MG monotherapy vs orchidectomy in the treatment of metastatic prostate cancer. The Scandinavian Casodex Cooperative Group

    Iversen, P; Tveter, K; Varenhorst, E


    The effect of Casodex (ICI 176,334), a new, once-daily, selective antiandrogen, given as 50 mg monotherapy, was compared with orchidectomy in a randomised, multicentre, open study in 376 patients with metastatic prostate cancer. At 3 months, PSA was reduced by 86% in the Casodex group and by 96% ...

  3. TID and Displacement Damage Effects in Vertical and Lateral Power MOSFETs for Integrated DC-DC Converters

    Faccio, F; Michelis, S; Faccio, Federico; Fuentes, C; Allongue, B; Sorge, R; Orlandi, S


    TID and displacement damage effects are studied for vertical and lateral power MOSFETs in five different technologies in view of the development of radiation-tolerant fully integrated DC-DC converters. Investigation is pushed to the very high level of radiation expected for an upgrade to the LHC experiments. TID induces threshold voltage shifts and, in n-channel transistors, source-drain leakage currents. Wide variability in the magnitude of these effects is observed. Displacement damage increases the on-resistance of both vertical and lateral high-voltage transistors. In the latter case, degradation at high particle fluence might lead to a distortion of the output characteristics curve. HBD techniques to limit or eliminate the radiation-induced leakage currents are successfully applied to these high-voltage transistors, but have to be used carefully to avoid consequences on the breakdown voltage.

  4. Identitetshantering på Facebook : En kvalitativ studie om förhållningssättet till den egna identiteten hos två olika åldersgrupper på vår tids mest offentliga scen

    Kåge, Isabelle


    Title: Identity management on Facebook: a qualitative study in approaches to personal identity between two different age groups on the most public stage of our time (Identitetshantering på Facebook: En kvalitativ studie om förhållningssättet till den egna identiteten hos två olika åldersgrupper på vår tids mest offentliga scen). Number of pages: 43. Author: Isabelle Kåge. Tutor: Amelie Hössjer. Course: Media and Communication Studies C. Period: Fall Semester 2010. University: Division of Medi...

  5. Zoladex plus flutamide vs. orchidectomy for advanced prostatic cancer. Danish Prostatic Cancer Group (DAPROCA)

    Iversen, P


    The study comprised 262 patients with previously untreated advanced carcinoma of the prostate. Patients were randomized either to undergo orchidectomy or to receive combined treatment with Zoladex, 3.6 mg every 4 weeks, plus flutamide, 250 mg t.i.d. At present the median follow-up is 39 months....... The objective response to therapy was better in the Zoladex plus flutamide group, but no differences in subjective response, time to disease progression, or survival have been demonstrated between the 2 groups. Adverse effects were more common in the Zoladex plus flutamide group. Thus, 'total androgen blockade......' with Zoladex plus flutamide was not clinically superior to orchidectomy in the treatment of patients with advanced prostatic cancer....

  6. Stratigraphy of the Lower Bambuí Group in the Arcos Region (MG: a Contribution from Boreholes

    Marly Babinski


    Full Text Available This study presents the fi rst results of the sample analysis of two boreholes drilled in a quarry located in the Arcos region(MG. Petrographic analysis (macro- and microscopic observations was performed and made possible to study in detailan approximately 175 meter-section, which shows the basement and 10 sedimentary units. The basement is represented bydark green to gray fi ne- to medium-grained granodiorite. At the base of the sedimentary sequence, Unit 1 is representedby a decimetric layer of polymictic diamictite and is overlain by the impure limestones of Unit 2. Unit 3 is carbonatic andcontains calcilutite and layers of carbonaceous shale. This unit gradually changes to Unit 4, which is composed of marland mudstone. Unit 5 is composed of a thick sequence of massive calcarenites, which begins to show lamellar layers andmicrobial structures in Unit 6. Unit 7 is similar to the previous one, but contains several intraclastic layers. The numberof lamellar layers decreases sharply, giving rise to a thick interval with considerable granulometric variations in Unit 8, which grades to the oolitic calcarenite of Unit 9. At the top of the sequence, Unit 10 is a thick package of stromatolitic dolarenite. Thisstratigraphic arrangement allows the identifi cation of progradational/retrogradational trends. The sedimentological features, especially those present in the basal portion, suggest that at least part of the carbonatic sequence could represent a cap carbonate, supporting a glacial origin for the diamictite. Other data also collected from the basal units suggest that changes occurred in the source area at the beginning of the fi lling of the basin.

  7. Tid1/Rdh54 translocase is phosphorylated through a Mec1- and Rad53-dependent manner in the presence of DSB lesions in budding yeast.

    Ferrari, Matteo; Nachimuthu, Benjamin Tamilselvan; Donnianni, Roberto Antonio; Klein, Hannah; Pellicioli, Achille


    Saccharomyces cerevisiae cells with a single double-strand break (DSB) activate the ATR/Mec1-dependent checkpoint response as a consequence of extensive ssDNA accumulation. The recombination factor Tid1/Rdh54, a member of the Swi2-like family proteins, has an ATPase activity and may contribute to the remodelling of nucleosomes on DNA. Tid1 dislocates Rad51 recombinase from dsDNA, can unwind and supercoil DNA filaments, and has been implicated in checkpoint adaptation from a G2/M arrest induced by an unrepaired DSB. Here we show that both ATR/Mec1 and Chk2/Rad53 kinases are implicated in the phosphorylation of Tid1 in the presence of DNA damage, indicating that the protein is regulated during the DNA damage response. We show that Tid1 ATPase activity is dispensable for its phosphorylation and for its recruitment near a DSB, but it is required to switch off Rad53 activation and for checkpoint adaptation. Mec1 and Rad53 kinases, together with Rad51 recombinase, are also implicated in the hyper-phosphorylation of the ATPase defective Tid1-K318R variant and in the efficient binding of the protein to the DSB site. In summary, Tid1 is a novel target of the DNA damage checkpoint pathway that is also involved in checkpoint adaptation.

  8. Pharmacokinetics of venlafaxine extended release 75  mg and desvenlafaxine 50  mg in healthy CYP2D6 extensive and poor metabolizers: a randomized, open-label, two-period, parallel-group, crossover study.

    Nichols, Alice I; Focht, Kristen; Jiang, Qin; Preskorn, Sheldon H; Kane, Cecelia P


    Genetically driven variations in the level of cytochrome P450 (CYP) 2D6 metabolic activity have been shown to significantly affect the pharmacokinetic behaviour of medications that are substrates of this enzyme. To evaluate the impact of CYP2D6 extensive metabolizer (EM) and poor metabolizer (PM) phenotypes on the pharmacokinetics of single doses of venlafaxine extended release (ER) and desvenlafaxine (administered as desvenlafaxine succinate). This study used a randomized, open-label, two-period, parallel-group, crossover design. The enrolled healthy subjects participated in the study for approximately 8 weeks, which included ≤ 6 weeks of screening procedures and two separate 1-week partial inpatient confinement periods (separated by a 4-day washout period), during which venlafaxine ER or desvenlafaxine was administered and blood samples were collected. Subjects were admitted to partial inpatient confinement in a laboratory setting for the two separate study periods where each study drug was individually administered. Blood samples for pharmacokinetic analyses were collected during the 120 hours following administration of each study drug. Plasma concentrations of the study drugs were measured by a third-party analyst using liquid chromatography-tandem mass spectrometry. Healthy subjects were recruited through newspaper advertisements and genotyped to determine their CYP2D6 metabolic phenotype (i.e. EM or PM) using internally developed and commercially available assays. Subjects were reimbursed for their participation in this study. Single, sequentially administered oral doses of the dual-acting, serotonin and norepinephrine reuptake inhibiting antidepressants venlafaxine ER (75  mg) and desvenlafaxine (50  mg) were administered. The main outcome measures were differences in the geometric means for area under the plasma concentration-time curve from time zero to infinity (AUC(∞)) and peak plasma concentration (C(max)) between EMs and PMs. Comparisons were

  9. Exigências nutricionais em macronutrientes minerais (Ca, P, Mg, Na e K para novilhos de diferentes grupos genéticos Macrominerals (Ca, P, Mg, Na, and K requirements for young bulls from different genetic groups

    Fernando de Paula Leonel


    Full Text Available Determinaram-se as exigências em macronutrientes minerais (Ca, P, Mg, Na e K utilizando-se 44 novilhos não-castrados, pertencentes a quatro grupos genéticos (Nelore; F1 Nelore x Aberdeen-Angus; F1 Nelore x Pardo-Suíço e F1 Nelore x Simental, com média de 10 e 11 meses de idade e peso vivo inicial de 362 ± 35 kg. A ração experimental foi composta de feno de capim-braquiária (Brachiaria decumbens, Stapf., farelo de soja, milho (grão moído, melaço em pó e suplementos de macro e micronutrientes inorgânicos. As exigências líquidas para ganho de peso, em cada macronutriente, foram obtidas por meio da derivada primeira de suas respectivas equações, estimadas a partir de regressão não-linear do conteúdo do nutriente (Ca, P, Mg, Na e K, em função do peso de corpo vazio do animal. Para conversão do peso vivo em peso de corpo vazio, utilizou-se a equação obtida a partir da regressão do peso corporal vazio dos animais experimentais em função de seus pesos imediatamente antes do abate. As exigências de mantença foram estimadas de acordo com as recomendações do NRC e ARC e os coeficientes de absorção adotados para os cinco macronutrientes foram aqueles propostos pelo ARC. O teste de identidade de modelos indicou não haver diferenças entre as equações de regressão para os minerais entre os quatro grupos genéticos estudados. Não foram verificadas, pela análise de variância, diferenças entre as exigências de macrominerais entre os diferentes grupos genéticos.The objective of this trial was to determine the macrominerals requirements (Ca, P, Mg, Na, and K for young bulls from different genetic groups. Forty-four young bulls from the following genetic groups were used: Nellore, F1 Nellore x Aberdeen-Angus, F1 Nellore x Brown Swiss, and F1 Nellore x Simmental. Animals averaged 362 ± 35 kg of initial body weight and between 10 to 11 months of age. Diet contained signal grass hay (Brachiaria decumbens, Stapf., soybean

  10. Repeat spinal anesthesia in cesarean section: A comparison between 10 mg and 12 mg doses of intrathecal hyperbaric (0.05%) bupivacaine repeated after failed spinal anesthesia: A prospective, parallel group study.

    Bhar, Debasish; RoyBasunia, Sandip; Das, Anjan; Chhaule, Subinay; Mondal, Sudipta Kumar; Bisai, Subrata; Chattopadhyay, Surajit; Mandal, Subrata Kumar


    Spinal anesthesia for cesarean section is not a 100% successful technique. At times, despite straightforward insertion and drug administration, intrathecal anesthesia for cesarean section fails to obtain any sensory or motor block. Very few studies and literature are available regarding repeat administration of spinal anesthesia and its drug dosage, especially after first spinal failure in cesarean section lower segment cesarean section (LSCS) due to fear of the excessive spread of drug. The aim of our study is to compare the outcome between two different doses of 0.5% hyperbaric bupivacaine repeated intrathecally after failed spinal. After taking informed consent and Ethical Committee approval this prospective, randomized single-blinded study was conducted in 100 parturients of American Society of Anesthesiologists I-II who were posted for elective LSCS and had Bromage score 0 and no sensory block even at L4 dermatome after 10 min of first spinal anesthesia; were included in the study. Group A (n = 50) patients received 2.4 ml and Group B (n = 50) patients received 2 ml of 0.5% hyperbaric bupivacaine respectively for administering repeat spinal anesthesia. Heart rate (HR), systolic blood pressure (SBP), diastolic blood pressure (DBP), oxygen saturation, respiratory rate and electrocardiogram were monitored both intra- and post-operatively and complications were recorded. Incidence of high spinal, bradycardia, hypotension, respiratory complications, and nausea vomiting are significantly higher in Group A compared to Group B (P cesarean section with 10 mg of 0.5% hyperbaric bupivacaine provided after first spinal anesthesia, the level of sensory block is below L4 and motor power in Bromage scale is 0.

  11. Non-contact atomic force microscopy study of hydroxyl groups on the spinel MgAl2O4(100) surface.

    Federici Canova, F; Foster, A S; Rasmussen, M K; Meinander, K; Besenbacher, F; Lauritsen, J V


    Atom-resolved non-contact atomic force microscopy (NC-AFM) studies of the magnesium aluminate (MgAl(2)O(4)) surface have revealed that, contrary to expectations, the (100) surface is terminated by an aluminum and oxygen layer. Theoretical studies have suggested that hydrogen plays a strong role in stabilizing this surface through the formation of surface hydroxyl groups, but the previous studies did not discuss in depth the possible H configurations, the diffusion behaviour of hydrogen atoms and how the signature of adsorbed H is reflected in atom-resolved NC-AFM images. In this work, we combine first principles calculations with simulated and experimental NC-AFM images to investigate the role of hydrogen on the MgAl(2)O(4)(100) surface. By means of surface energy calculations based on density functional theory, we show that the presence of hydrogen adsorbed on the surface as hydroxyl groups is strongly predicted by surface stability considerations at all relevant partial pressures of H(2) and O(2). We then address the question of how such adsorbed hydrogen atoms are reflected in simulated NC-AFM images for the most stable surface hydroxyl groups, and compare with experimental atom-resolved NC-AFM data. In the appendices we provide details of the methods used to simulate NC-AFM using first principles methods and a virtual AFM.

  12. Etisk kompetanseheving i norske kommuner – hva er gjort, og hva har vært levedyktig over tid?

    Elisabeth Gjerberg


    Full Text Available De senere år har pleie- og omsorgstjenesten i mange norske kommuner startet med ulike former for etikkarbeid, oftest initiert av KS’ prosjekt “Samarbeid om etisk kompetanseheving”. Hensikten med vår studie var å evaluere innsatsen i de kommunene som deltok i prosjektet fra starten av, med vekt på hvilke tiltak som var iverksatt, hvilke virksomheter dette omfattet, og om tiltakene har fortsatt utover prosjektperioden. Studien har et kvalitativt design. Materialet er hovedsakelig basert på telefonintervjuer med kontaktpersoner for etikksatsingen i 34 kommuner. Det transkriberte materialet er analysert ved kvalitativ innholdsanalyse. Med unntak av fem kommuner som aldri kom i gang med etikkarbeidet, hadde de fleste startet etikkrefleksjon innenfor flere tjenester, oftest i sykehjem og hjemmetjenester. Noen kommuner hadde imidlertid ikke klart å videreføre etikkarbeidet utover en prosjektperiode. Det var stor variasjon både i etikkarbeidets forankring i kommunen, omfang, hyppighet og metoder. Et gjennomgående funn er vektlegging av behovet for etikkkompetanse og oppfølging av dem som skal lede etikkarbeidet. Flertallet av kommunene som fortsatt gjennomfører etikkrefleksjon, tar utgangspunkt i egen praksis, men et mindretall anvender strukturerte metoder. Dersom etikkarbeidet i kommunen skal være levedyktig over tid, bør arbeidet forankres på flere nivåer i organisasjonen, og de som skal lede dette arbeidet, bør få styrket sin kompetanse i etikk og etikkrefleksjon.Nøkkelord: etikk, evaluering, kommunehelsetjenestenEnglish summary: Building ethical competence in Norwegian municipalities: What has been done and what has been sustainable?“Cooperation for building ethics competence” is a national project aimed to stimulate moral reflection and build competence in ethics in community health services in Norway. This article is based on an evaluation of the activities implemented by the first 34 participating municipalities

  13. Case studies of the propagation characteristics of auroral TIDS with EISCAT CP2 data using maximum entropy cross-spectral analysis

    S. Y. Ma

    Full Text Available In this paper case studies of propagation characteristics of two TIDs are presented which are induced by atmospheric gravity waves in the auroral F-region on a magnetic quiet day. By means of maximum entropy cross-spectral analysis of EISCAT CP2 data, apparent full wave-number vectors of the TIDs are obtained as a function of height. The analysis results show that the two events considered can be classified as moderately large-scale TID and medium-scale TID, respectively. One exhibits a dominant period of about 72 min, a mean horizontal phase speed of about 180 m/s (corresponding to a horizontal wavelength of about 780 km directed south-eastwards and a vertical phase speed of 55 m/s for a height of about 300 km. The other example shows a dominant period of 44 min, a mean horizontal phase velocity of about 160 m/s (corresponding to a horizontal wavelength of about 420 km directed southwestwards, and a vertical phase velocity of about 50 m/s at 250 km altitude.

    Key words. Ionosphere · Auroral ionosphere · Ionosphere-atmosphere interactions · Wave propagation

  14. Structure, bonding and energetics of N-heterocyclic carbene (NHC) stabilized low oxidation state group 2 (Be, Mg, Ca, Sr and Ba) metal complexes: A theoretical study

    Ashim Baishya; V Rao Mundlapati; Sharanappa Nembenna; Himansu S Biswal


    A series of N-heterocyclic carbene stabilized low oxidation state group 2 metal halide and hydrides with metal-metal bonds ([L(X) M-M(X) L]; L = NHC ((CHNH)2C:), M = Be, Mg, Ca, Sr and Ba, and X = Cl or H) has been studied by computational methods. The main objective of this study is to predict whether it is possible to stabilize neutral ligated low oxidation state alkaline-earth metal complexes with metal-metal bonds. The homolytic metal-metal Bond Dissociation Energy (BDE) calculation, Natural Bond Orbital (NBO) and Energy Decomposition Analyses (EDA) on density functional theory (DFT) optimized [L(X)M-M(X)L] complexes revealed that they are as stable as their -diketiminate, guanidinate and -diimine counterparts. The optimized structures of the complexes are in trans-linear geometries. The bond order analyses such as Wiberg Bond Indices (WBI) and Fuzzi Bond Order (FBO) confirm the existence of single bond between two metal atoms, and it is covalent in nature.

  15. A uniform LMI formulation for tuning PID, multi-term fractional-order PID, and Tilt-Integral-Derivative (TID) for integer and fractional-order processes.

    Merrikh-Bayat, Farshad


    In this paper first the Multi-term Fractional-Order PID (MFOPID) whose transfer function is equal to [Formula: see text] , where kj and αj are unknown and known real parameters respectively, is introduced. Without any loss of generality, a special form of MFOPID with transfer function kp+ki/s+kd1s+kd2s(μ) where kp, ki, kd1, and kd2 are unknown real and μ is a known positive real parameter, is considered. Similar to PID and TID, MFOPID is also linear in its parameters which makes it possible to study all of them in a same framework. Tuning the parameters of PID, TID, and MFOPID based on loop shaping using Linear Matrix Inequalities (LMIs) is discussed. For this purpose separate LMIs for closed-loop stability (of sufficient type) and adjusting different aspects of the open-loop frequency response are developed. The proposed LMIs for stability are obtained based on the Nyquist stability theorem and can be applied to both integer and fractional-order (not necessarily commensurate) processes which are either stable or have one unstable pole. Numerical simulations show that the performance of the four-variable MFOPID can compete the trivial five-variable FOPID and often excels PID and TID.

  16. Lykke i ulykkens tid

    Thomsen, Torsten Bøgh


    Taking its point of departure in two contemporary Danish poets, Victor Boy Lindholm and Theis Ørntoft, the article discusses affective poetic responses to the climate crisis. The concepts of ‘eco-mourning’ and ‘climate-melancholia’ are examined in order to deliberate the possibility for human hap...

  17. Lykke i ulykkens tid

    Thomsen, Torsten Bøgh


    Taking its point of departure in two contemporary Danish poets, Victor Boy Lindholm and Theis Ørntoft, the article discusses affective poetic responses to the climate crisis. The concepts of ‘eco-mourning’ and ‘climate-melancholia’ are examined in order to deliberate the possibility for human hap...

  18. Tid/skrift

    Diderichsen, Adam

    En samlet fremstilling af Derridas filosofi med særlig vægt på hans forhold til fænomenologien.......En samlet fremstilling af Derridas filosofi med særlig vægt på hans forhold til fænomenologien....

  19. Zoladex plus flutamide vs. orchidectomy for advanced prostatic cancer. Danish Prostatic Cancer Group (DAPROCA)

    Iversen, P


    The study comprised 262 patients with previously untreated advanced carcinoma of the prostate. Patients were randomized either to undergo orchidectomy or to receive combined treatment with Zoladex, 3.6 mg every 4 weeks, plus flutamide, 250 mg t.i.d. At present the median follow-up is 39 months......' with Zoladex plus flutamide was not clinically superior to orchidectomy in the treatment of patients with advanced prostatic cancer....

  20. Space group and hydrogen positions of single crystal delta-AlOOH, (Al0.84Mg0.07Si0.09)H0.98O2 and its relation to stishovite and brucite

    Kudoh, Y.; Kuribayashi, T.; Suzuki, A.; Ohtani, E.; Kamada, T.


    A single crystal of δ-AlOOH synthesized by Suzuki et al. (2000) at conditions of 1000^oC and 21 GPa was used in this study. A set of X-ray diffraction intensities up to sinθ/λ=0.80 Å-1 were measured with a single crystal of 83×35×24 μm using MoKα radiation (50 kV, 40 mA). Al:Mg:Si ratio 0.84:0.07:0.09 measured by EDS with the same crystal used in the X-ray diffraction intensity measurement yielded the chemical formula (Al0.84Mg0.07Si0.09)H0.98O_2. Suzuki et al. (2000) reported the space group P2_1nm from powder X-ray data but the systematic absence of reflections observed in this study indicated another space group Pnn2. The systematic absence of reflections observed in the present work were h+l odd for h0l and k+l odd for 0kl, indicating possible space group Pnn2 or Pnnm. The N(Z) test for a center of symmetry indicated an acentric space group. The non-centrosymmetric space group Pnn2 was therefore employed and was confirmed by the structural refinement. The agreement factors for 109 independent reflections (Io>= 3.0σ Io) were R=3.6% with anisotropic temperature factors. The difference Fourier synthesis was calculated and two significant Fourier peaks H1 and H2 for the possible hydrogen sites were found. The H1 site locates around two-fold rotation axis with H1-H1 distance of 0.55 Å. The H1 site is considered to be for symmetrical statistical distribution of hydrogen atoms. The H2-H2 are separated with H2-H2 distance 2.12 Å which is larger than the sum of van der Waals radii of hydrogen atoms. The partial occupancy of Mg and Si atoms at Al site suggests the possibility of limited solid solution among δ-AlOOH, stishovite SiO_2 and hypothetical rutile-structured Mg(OH)_2. The H1 site is considered to be for AlOOH and the H_2 site for Mg(OH)_2.

  1. The effects of lumiracoxib 100 mg once daily vs. ibuprofen 600 mg three times daily on the blood pressure profiles of hypertensive osteoarthritis patients taking different classes of antihypertensive agents

    MacDonald, T M; Richard, D; Lheritier, K; Krammer, G


    Aims: To examine whether the blood pressure (BP) profiles of lumiracoxib and high-dose ibuprofen differed in patients treated with different classes of antihypertensive medications. Methods: A 4-week, multicentre, randomised, double-blind study has compared the effects of lumiracoxib 100 mg once daily (od) (n = 394) and ibuprofen 600 mg three times daily (tid) (n = 393) on ambulatory BP in osteoarthritis (OA) patients with controlled hypertension. Here, we present subgroup analyses for patients receiving different antihypertensive classes. The primary outcome was a comparison of the change in 24-h mean systolic ambulatory BP (MSABP) from baseline to week 4. Patients receiving angiotensin receptor blockers (ARBs) or angiotensin-converting enzyme inhibitors (ACEIs) represented the largest subgroups receiving antihypertensive monotherapy. Results: For patients receiving an ARB monotherapy, the least squares mean (LSM) 24-h MSABP at week 4 fell with lumiracoxib 100 mg od and increased with ibuprofen 600 mg tid, creating an estimated treatment difference of 8.1 mmHg in favour of lumiracoxib (p treatment difference was 8.2 mmHg (p treatment differences were greater than observed in the overall population (5.0 mmHg in favour of lumiracoxib). In patients receiving diuretics or calcium channel blockers, treatment differences in MSABP were smaller and not statistically significant, although they remained in favour of lumiracoxib. Conclusion: Lumiracoxib 100 mg od resulted in less destabilisation of BP than high-dose ibuprofen 600 mg tid, and this effect was the greatest in subgroups treated with drugs blocking the renin-angiotensin system. PMID:20518950

  2. NREL and Sandia National Laboratories (SNL) Support of Ocean Renewable Power Company's TidGen™ Power System Technology Readiness Advancement Initiative Project

    LiVecchi, Al [National Renewable Energy Laboratory (NREL), Golden, CO (United States)


    This document summarizes the tasks identified for National Laboratory technical support of Ocean Renewable Power Corporation (ORPC) DOE grant awarded under the FY10 Industry Solicitation DE-FOA-0000293: Technology Readiness Advancement Initiative. The system ORPC will deploy in Cobscook Bay, ME is known as the TidGen™ Power System. The Turbine Generator Unit (TGU) each have a rated capacity of 150 to 175 kW, and they are mounted on bottom support frames and connected to an onshore substation using an underwater power and control cable. This system is designed for tidal energy applications in water depths from 60 to 150 feet. In funding provided separately by DOE, National Laboratory partners NREL and SNL will provide in-kind resources and technical expertise to help ensure that industry projects meet DOE WWPP (Wind and Water Power Program) objectives by reducing risk to these high value projects.

  3. Dose escalation improves therapeutic outcome: post hoc analysis of data from a 12-week, multicentre, double-blind, parallel-group trial of trospium chloride in patients with urinary urge incontinence

    Bödeker Rolf-Hasso


    Full Text Available Abstract Background Flexible dosing of anticholinergics used for overactive bladder (OAB treatment is a useful strategy in clinical practice for achieving a maximum effective and maximum tolerated level of therapeutic benefit. In this post hoc analysis we evaluated the efficacy and tolerability of trospium chloride treatment for urinary urge incontinence (UUI with focus on flexible dosing. Methods The data came from a 12-week, randomised, double-blind, phase IIIb study in which 1658 patients with urinary frequency plus urge incontinence received trospium chloride 15 mg TID (n = 828 or 2.5 mg oxybutynin hydrochloride TID (n = 830. After four weeks, daily doses were doubled and not readjusted in 29.2% (242/828 of patients in the trospium group, and in 23.3% (193/830 in the oxybuytnin group, until the end of treatment. We assessed the absolute reduction in weekly UUI episodes and the change in intensity of dry mouth, recorded in patients' micturition diaries. Adverse events were also evaluated. Statistics were descriptive. Results Dose escalation of either trospium or oxybutynin increased reduction in UUI episodes in the population studied. At study end, there were no relevant differences between the "dose adjustment" subgroups and the respective "no dose adjustment" subgroups (trospium: P = 0.249; oxybutynin: P = 0.349. After dose escalation, worsening of dry mouth was higher in both dose adjusted subgroups compared to the respective "no dose adjustment" subgroups (P P Conclusions Flexible dosing of trospium was proven to be as effective, but better tolerated as the officially approved adjusted dose of oxybutynin. Trial registration (parent study The study was registered with the German Federal Institute for Drugs and Medical Devices (BfArM, Berlin, Germany, registration number 4022383, as required at the time point of planning this study.

  4. The cost-effectiveness of exenatide twice daily (BID) vs insulin lispro three times daily (TID) as add-on therapy to titrated insulin glargine in patients with type 2 diabetes

    Gordon, J.; McEwan, P.; Sabale, U.; Kartman, B.; Wolffenbuttel, B. H. R.


    Objective: To evaluate the cost-effectiveness of exenatide twice daily (BID) vs bolus insulin lispro three times daily (TID) as add-on therapy when glycemic control is sub-optimal with titrated basal insulin glargine and metformin. Methods: The analysis was based on the recent 4B Study, which compar

  5. 存储单元抗 TID/SEL电路加固技术面积代价研究%Study on the Memory Cell TID/SEL Hardening by Design Technology Area Cost

    王文; 桑红石; 沈绪榜


    In space radiation environment ,total ionizing dose (TID) effect and single event latch (SEL) have serious impact on the reliability of memory devices . Total Ionizing Dose effect and Single Event Latch and radiation hardening technologies were discussed ,especially the Radiation Harden by Design hardening technologies .Four types of new TID/SEL tolerable memory cells are designed to compare the area cost with the available designs .The results show TID/SEL tolerable memory cell design generally increases the cell area by 87 .5% at least .One of the proposed programs could make a good trade-off between the hardening performance and the area cost .%在太空辐射环境中,总剂量辐射(Total Ionizing Dose ,TID)效应和单粒子闩锁(Single Event Latch ,SEL)效应严重影响存储器的可靠性.由此讨论了存储单元 TID效应和SEL效应的原理,探讨了基于电路的加固技术(RHBD),设计了4种新的抗TID/SEL存储单元加固方案,并和现有几种方案进行对比,研究了这些加固方案的面积代价.研究结果表明,抗TID/SEL RHBD方案普遍会使存储单元的版图面积增加87.5%以上.提出了一种加固方案,可以在加固性能和面积代价上得到较好的折衷.

  6. Alumovesuvianite, Ca19Al(Al,Mg)12Si18O69(OH)9, a new vesuvianite-group member from the Jeffrey mine, asbestos, Estrie region, Québec, Canada

    Panikorovskii, Taras L.; Chukanov, Nikita V.; Aksenov, Sergey M.; Mazur, Anton S.; Avdontseva, Evgenia Yu; Shilovskikh, Vladimir V.; Krivovichev, Sergey V.


    Alumovesuvianite (IMA 2016-014), ideally Ca19Al(Al,Mg)12Si18O69(OH)9, is a new vesuvianite-group member found in the rodingite zone at the contact of a gabbroid rock with host serpentinite in the abandoned Jeffrey mine, Asbestos, Estrie Region, Québec, Canada. It occurs as prismatic tetragonal crystals up to 4 × 4 × 6 mm3 in size encrusting walls of cavities in a granular diopside. Associated minerals are diopside, grossular and prehnite. Single crystals of alumovesuvianite are transparent colorless or light pink with a vitreous lustre. The dominant crystal forms are {100}, {110}, {210}, {111}, {101} and {001}. The Mohs hardness is 6.5. The specific gravitiy is D meas = 3.31(1) g/cm3 and D calc = 3.36 g/cm3, respectively. The mineral is optically uniaxial (-), ω = 1.725(2), ɛ = 1.722(2). The chemical composition, determined by SEM-WDS (wavelength-dispersive spectroscopy on a scanning electron microscope; all oxides except H2O) and TG (thermogravimety; H2O) analysis, is: SiO2 37.1 wt%, Al2O3 18.8 wt%, CaO 36.6 wt%, MgO 2.48 wt%, Mn2O3 0.67 wt%, Fe2O3 0.22 wt%, H2O 2.61 wt%, total 98.5 wt%. The empirical formula based on 19 Ca atoms per formula unit and taking into account the MAS-NMR (magic-angle spinning nuclear magnetic resonance) data, is: Ca19.00(Al0.92Fe3+ 0.08)Σ1.00(Al9.83Mg1.80Mn3+ 0.25)Σ11.88Si17.98O69.16(OH)8.44. The most intense IR absorption bands lie in the ranges 412-609, 897-1024, and 3051-3671 cm-1. The eight strongest lines of the powder X-ray diffraction pattern are (I-d(Å)-hkl): 22-2.96-004, 100-2.761-432, 61-2.612-224, 25-2.593-600, 20-1.7658-831, 20-1.6672-734, 21-1.6247-912, and 22-1.3443-880. Alumovesuvianite is tetragonal, space group P4/n, unit-cell parameters refined from the powder data are a = 15.5603(5) Å, c = 11.8467(4) Å, V = 2868.3(4) Å3, Z = 2. The crystal structure has been refined to R 1 = 0.036 for 3098 unique observed reflections with |F o| ≥ 4σ F . The structure refinement provides the bond length of 1.916 Å and

  7. A randomised comparison of bicalutamide ('Casodex') 150 mg versus placebo as immediate therapy either alone or as adjuvant to standard care for early non-metastatic prostate cancer. First report from the Scandinavian Prostatic Cancer Group Study No. 6

    Iversen, P; Tammela, T L J; Vaage, S


    To assess the efficacy and tolerability of bicalutamide 150 mg ('Casodex'(1)) as immediate therapy, either alone or as adjuvant to treatment of curative intent, in patients with early (T1b-T4, any N, M0) prostate cancer.......To assess the efficacy and tolerability of bicalutamide 150 mg ('Casodex'(1)) as immediate therapy, either alone or as adjuvant to treatment of curative intent, in patients with early (T1b-T4, any N, M0) prostate cancer....

  8. Tid og rum i boligen

    Duelund Mortensen, Peder; Welling, Helen; Wiell Nordberg, Lene


    Institut for Planlægning på Kunstakademiets Arkitektskole har iværksat forskningsprojektet 'Den situationsbestemte bybolig', der gennem interviewundersøgelser med beboere i tre udvalgte nyere boligbebyggelser spørger : 'Hvad gør I ved boligen - hvad gør boligen ved jer?'. Forskerne (artiklens for...

  9. Atualização sobre comorbidade entre transtorno do déficit de atenção e hiperatividade (TDAH) e transtornos invasivos do desenvolvimento (TID)

    Daniel Segenreich; Paulo Mattos


    CONTEXTO: Atualmente, a comorbidade transtorno do déficit de atenção e hiperatividade (TDAH) e transtornos invasivos do desenvolvimento (TID) não pode ser estabelecida por meio dos critérios da DSM-IV. Entretanto, diversos pesquisadores questionam esta impossibilidade descrevendo quadros clínicos de pacientes que apresentam características de ambos os transtornos. Esta revisão busca estes achados e propõe uma reflexão sobre o assunto. OBJETIVO: Revisar, de modo seletivo, estudos mais signific...

  10. Reduction of [Cp*Sb]4 with Subvalent Main-Group Metal Reductants: Syntheses and Structures of [(L(1) Mg)4 (Sb4 )] and [(L(2) Ga)2 (Sb4 )] Containing Edge-Missing Sb4 Units.

    Ganesamoorthy, Chelladurai; Krüger, Julia; Wölper, Christoph; Nizovtsev, Anton S; Schulz, Stephan


    [Cp*Sb]4 (Cp*=C5 Me5 ) reacts with [L(1) Mg]2 and L(2) Ga with formation of [(L(1) Mg)4 (μ4 ,η(1:2:2:2) -Sb4 )] (L(1) =iPr2 NC[N(2,6-iPr2 C6 H3 )]2 , 1) and [(L(2) Ga)2 (μ,η(2:2) -Sb4 )] (L(2) =HC[C(Me)N(2,6-iPr2 C6 H3 )]2 , 2). The cleavage of the Sb-Sb and Sb-C bonds in [Cp*Sb]4 are the crucial steps in both reactions. The formation of 1 occurred by elimination of the Cp* anion and formation of Cp*MgL(1) , while 2 was formed by reductive elimination of Cp*2 and oxidative addition of L(2) Ga to the Sb4 unit. 1 and 2 were characterized by heteronuclear NMR spectroscopy and single-crystal X-ray diffraction, and their bonding situation was studied by quantum chemical calculations.

  11. Treatment of patients with essential hypertension: amlodipine 5 mg/benazepril 20 mg compared with amlodipine 5 mg, benazepril 20 mg, and placebo.

    Kuschnir, E; Acuña, E; Sevilla, D; Vasquez, J; Bendersky, M; Resk, J; Glazer, R


    This multicenter, double-masked, randomized, parallel-group study compared the efficacy, tolerability, and safety of amlodipine 5 mg/benazepril 20 mg, amlodipine 5 mg, benazepril 20 mg, and placebo in patients with essential hypertension. After a placebo run-in period, 308 patients (all white) were randomized to treatment groups and took medication once daily for 8 weeks. Blood pressure was measured after 4 and 8 weeks of treatment in the 23- to 26-hour period after dosing. Patients wore a noninvasive blood pressure monitor for 24 hours before randomization and before the final visit. Investigators recorded adverse experiences at randomization and at study weeks 4 and 8, and obtained specimens for laboratory testing at randomization and at study week 8. Three hundred seven patients were evaluated for efficacy, and 308 for tolerability and safety. At end point (the last postrandomization measurement for each patient), the reduction in mean sitting diastolic blood pressure with the amlodipine 5 mg/benazepril 20 mg treatment was statistically significantly greater than with any comparative therapy. The results of 24-hour monitoring showed that the amlodipine/benazepril treatment, unlike monotherapy, maintained the hourly mean diastolic blood pressure at amlodipine 5 mg/benazepril 20 mg versus 67.5%, 53.3%, and 15.8% with amlodipine, benazepril, and placebo, respectively. This difference between the amlodipine/benazepril treatment group and each comparative single-agent treatment group was statistically significant. Drug-related adverse events occurred in 15.6% of patients in the amlodipine/benazepril group and in 24.7%, 6.5%, and 11.7% of patients in the amlodipine, benazepril, and placebo groups, respectively. Edema occurred less often in the amlodipine/benazepril group than in the amlodipine group. Overall, once-daily therapy with amlodipine 5 mg/benazepril 20 mg provided an antihypertensive effect that was statistically and clinically superior to amlodipine 5 mg

  12. Results of a phase II trial with second-line cystemustine at 60 mg/m{sup 2} in advanced soft tissue sarcoma: A trial of the EORTC early clinical studies group

    Chollet, P. [Centre Jean Perrin and Inserm U71, 58 rue Montalembert, B.P. 392, 63011 Clermont-Ferrand Cedex 1 (France); Fumoleau, P. [Centre Rene Gauducheau, Site Hospitalier Nord, Boulevard Jacques Monod, 44805 Saint-Herblain Cedex (France); Lentz, M.A. [EORTC Data Center, Avenue E. Mounier, 83-B. 11, 1200 Brussels (Belgium); Chevallier, B. [Centre Henri Becquerel, Rue d' Amiens, 76038 Rouen Cedex (France); Roche, H. [Centre Claudius Regaud, 20-24 rue du Pont-Saint-Pierre, 31052 Toulouse Cedex (France); Kerbrat, P. [Centre Eugene Marquis, Rue de la bataille Flandre-Dunkerque, B.P. 6279, 35062 Rennes Cedex (France); Tubiana, N. [C.H.U. Dupuytren, 2 avenue Martin Luther King, 87042 Limoges Cedex (France); Adenis, A. [Centre Oscar Lambret, Rue Frederic Combemale, B.P. 307, 59020 Lille Cedex (France); Krakowski, I. [Centre Alexis Vautrin, Avenue de Bourgogne, 54511 Vandoeuvre-les-Nancy Cedex (France); Cure, H. [Centre Jean Perrin and Inserm U71, 58 rue Montalembert, B.P. 392, 63011 Clermont-Ferrand Cedex 1 (France)


    The aim of this phase II trial was to examine the efficacy of a new nitrosourea, cystemustine, in soft tissue sarcoma. Between January 1990 and March 1991, 32 pretreated patients with advanced soft tissue sarcoma were enrolled. Cystemustine was given every 2 weeks at 60 mg/m{sup 2} via a 15-min i.v. infusion. All eligible patients were considered evaluable for response and toxicity (WHO criteria). Of the 32 enrolled patients, 4 were ineligible, leaving 28 evaluable patients. All but 1 had been pretreated: 6 with adjuvant chemotherapy, 18 patients with first-line palliative chemotherapy without nitrosourea, 3 with both treatments, and 18 had received radiotherapy. Median age was 54 years (range 20-73) and median performance status was 1 (0-2). One partial response (PR, duration 12 weeks), 2 stable disease and 25 progressions were observed, giving an overall response rate of 3.57% (confidence interval: 0.1-18.4%). Toxicity was mild, and was mainly neutropenia (no grade 3 or 4), thrombocytopenia (3.57% grade 3 and grade 4) and nausea-vomiting (no grade 3 or 4). It should be noted that the treatment for the patient who obtained a PR was third line with no previous response. Cystemustine with this schedule appears to have a low clinical activity and toxicity in advanced soft tissue sarcoma. (Copyright (c) 1998 Elsevier Science B.V., Amsterdam. All rights reserved.)

  13. Evaluation of the effect of the specific CCR1 antagonist CP-481715 on the clinical and cellular responses observed following epicutaneous nickel challenge in human subjects

    Borregaard, Jeanett; Skov, Lone; Wang, Lisy;


    and cellular infiltration in skin biopsies following epicutaneous nickel challenge in allergic subjects. SUBJECTS/METHODS: In this phase 1/2 study, 40 subjects were randomized to 5 days of treatment in four parallel groups (placebo three times daily (TID), placebo once daily (QD), 1000 mg CP-418 715 TID...

  14. Mifepristone 5 mg versus 10 mg for emergency contraception: double-blind randomized clinical trial

    Carbonell JL


    Full Text Available Josep Lluis Carbonell,1 Ramon Garcia,2 Adriana Gonzalez,2 Andres Breto,2 Carlos Sanchez2 1Mediterranea Medica Clinic, Valencia, Spain; 2Eusebio Hernandez Gynecology and Obstetrics Teaching Hospital, Havana, Cuba Purpose: To estimate the efficacy and safety of 5 mg and 10 mg mifepristone for emergency contraception up to 144 hours after unprotected coitus. Methods: This double-blind randomized clinical trial was carried out at Eusebio Hernandez Hospital (Havana, Cuba. A total of 2,418 women who requested emergency contraception after unprotected coitus received either 5 mg or 10 mg mifepristone. The variables for assessing efficacy were the pregnancies that occurred and the fraction of pregnancies that were prevented. Other variables assessed were the side effects of mifepristone, vaginal bleeding, and changes in the date of the following menstruation. Results: There were 15/1,206 (1.2% and 9/1,212 (0.7% pregnancies in the 5 mg and 10 mg group, respectively (P=0.107. There were 88% and 93% prevented pregnancies in the 5 mg and 10 mg group, respectively. The side effect profiles were similar in both groups. Delayed menstruation ≥7 days was experienced by 4.9% and 11.0% of subjects in the 5 mg and 10 mg group, respectively (P=0.001. There was a significant high failure rate for women weighing >75 kg in the 5 mg group. Conclusion: It would be advisable to use the 10 mg dose of mifepristone for emergency contraception as there was a trend suggesting that the failure rate of the larger dose was lower. Keywords: mifepristone, emergency contraception

  15. Vitamin K prophylaxis for premature infants: 1 mg versus 0.5 mg.

    Costakos, Dennis T; Greer, Frank R; Love, Laureen A; Dahlen, Lynn R; Suttie, John W


    We studied babies (22 to 32 weeks gestational age) of mothers wishing to breast-feed. Group 1 received 1 mg of vitamin K and Group 2 received 0.5 mg of vitamin K. The Day 2 plasma levels of vitamin K were 1900 to 2600 times higher on average, and the Day 10 vitamin K levels 550 to 600 times higher on average, relative to normal adult plasma values, whether an initial prophylaxis dose of 0.5 mg or 1 mg was used. We conclude that 0.5 mg as the initial dose of vitamin K intramuscularly or intravenously would likely be more than adequate to prevent hemorrhagic disease of the newborn, and that 0.3 mg/per kg may be used for babies with birth weights below 1000 g. To decrease vitamin K intakes in this population, new preparations of total parenteral nutrition multivitamins are needed.

  16. Expressió, purificació i cristal·lització de la proteïna HMGA1a humana amb oligonucleòtids rics en ATs

    Sánchez Giraldo, Raquel


    En tota mena de càncers es troben altes concentracions de proteïnes HMGA. Per comprendre el mecanisme d’acció d'aquestes proteïnes cal determinar l’estructura tridimensional dels complexos d’aquestes amb el DNA. Amb aquesta finalitat en aquest projecte es persegueix l’obtenció de co-cristalls de la proteïna HMGA1a i els seus fragments amb oligonucleòtids sintètics rics en seqüències ATs i també provar la cristal·lització d’un pèptid sintètic amb una seqüència similar a la prote...

  17. Magnesium homeostasis in cardiac myocytes of Mg-deficient rats.

    Michiko Tashiro

    Full Text Available To study possible modulation of Mg(2+ transport in low Mg(2+ conditions, we fed either a Mg-deficient diet or a Mg-containing diet (control to Wistar rats for 1-6 weeks. Total Mg concentrations in serum and cardiac ventricular tissues were measured by atomic absorption spectroscopy. Intracellular free Mg(2+ concentration ([Mg(2+]i of ventricular myocytes was measured with the fluorescent indicator furaptra. Mg(2+ transport rates, rates of Mg(2+ influx and Mg(2+ efflux, were estimated from the rates of change in [Mg(2+]i during Mg loading/depletion and recovery procedures. In Mg-deficient rats, the serum total Mg concentration (0.29±0.026 mM was significantly lower than in control rats (0.86±0.072 mM after 4-6 weeks of Mg deficiency. However, neither total Mg concentration in ventricular tissues nor [Mg(2+]i of ventricular myocytes was significantly different between Mg-deficient rats and control rats. The rates of Mg(2+ influx and efflux were not significantly different in both groups. In addition, quantitative RT-PCR revealed that Mg deficiency did not substantially change mRNA expression levels of known Mg(2+ channels/transporters (TRPM6, TRPM7, MagT1, SLC41A1 and ACDP2 in heart and kidney tissues. These results suggest that [Mg(2+]i as well as the total Mg content of cardiac myocytes, was well maintained even under chronic hypomagnesemia without persistent modulation in function and expression of major Mg(2+ channels/transporters in the heart.

  18. Evaluation of sedative effects of single and repeated doses of 50 mg and 150 mg tolperisone hydrochloride. Results of a prospective, randomized, double-blind, placebo-controlled trial.

    Dulin, J; Kovács, L; Ramm, S; Horvath, F; Ebeling, L; Kohnen, R


    Sedative effects of single and repeated doses of 50 mg and 150 mg tolperisone hydrochloride (Mydocalm), a centrally active muscle-relaxing agent, were evaluated in a placebo-controlled double-blind clinical trial. A total of 72 healthy young adults balanced by sex were randomized to receive 50 mg or 150 mg tolperisone hydrochloride or placebo t.i.d. for a period of 8 days. Control examinations were performed in the mornings of days 1 and 8 before intake of the morning dose and at 1.5, 4 and 6 hours postdose. The psychomotoric test battery used in this trial revealed no sedative effects of tolperisone hydrochloride in the given doses at any control examination. Subjective mood ratings quantified by the Welzel Colored Scales were not impaired either. The lack of differences in sedative potentials of tolperisone hydrochloride and placebo was confirmed by tests on differences and by tests on equivalence using 95% CI. The present study substantiates clinical experience and previous clinical trials demonstrating that tolperisone hydrochloride, though being a centrally active muscle relaxant, does not cause any sedation and does not impair reaction times.

  19. Effect of Ni on Mg based hydrogen storage alloy Mg3Nd

    TONG Yanqing; OUYANG Liuzhang; ZHU Min


    Magnesium-neodymium based alloys were prepared by induction melting in an alumina crucible under protection of pure argon atmosphere. XRD patterns show that the as-melted Mg-Nd and Mg3NdNi 0.1 diffraction peaks can be excellently indexed with D03 structure (BiF3 type, space group Fm3m ). The lattice constant of Mg3Nd phase is 0.7390 nm, which is determined by XRD analysis using Cohen's extrapolation method. The reversible hydrogen storage capacity reaches 1.95wt.% for Mg3Nd and 2.68wt.% for Mg3NdNi0.1 . The desorption of hydrogen takes place at 291 ℃ for Mg3Nd and at 250 ℃ for Mg3NdNi 0.1 . The alloys could absorb hydrogen at room temperature with rapid hydriding and dehydriding kinetics after only one cycle. The enthalpy (ΔH ) and entropy (ΔS ) of Mg3Nd-H dehydriding reaction were -68.2 kJ·mol-1 H2 and -0.121 kJ·(K·mol)-1 H2 determined by using van't Hoff plot according to the pressure-composition-isotherms (P-C-I) curve measured at different temperatures. Hydrogen absorption kinetic property of Mg3NdNi 0.1 alloy was also measured at room temperature.

  20. Comparison of rizatriptan 5 mg and 10 mg tablets and sumatriptan 25 mg and 50 mg tablets.

    Kolodny, A; Polis, A; Battisti, W P; Johnson-Pratt, L; Skobieranda, F


    This randomized, double-blind, two-attack, placebo-controlled, crossover study explored the efficacy and tolerability of rizatriptan 10 mg compared with sumatriptan 50 mg as well as rizatriptan 5 mg compared with sumatriptan 25 mg in the acute treatment of migraine. Following randomization to one of six possible treatment sequences, patients (n = 1447) treated two sequential attacks, of moderate or severe intensity, separated by at least 5 days. Patients assessed pain severity, migraine-associated symptoms, and functional disability at 0.5, 1, 1.5, and 2 h post treatment. Compared with placebo, all treatments were effective. On the primary endpoint of time to pain relief, rizatriptan 10 mg was not statistically different from sumatriptan 50 mg [odds ratio (OR) 1.10, P = 0.161], and rizatriptan 5 mg was statistically superior to sumatriptan 25 mg (OR 1.22, P = 0.007). In general, rizatriptan 10 mg and 5 mg treatment resulted in improvement compared with the corresponding doses of sumatriptan on measures of pain severity, migraine symptoms, and functional disability and the 5-mg dose reached statistical significance on almost all measures. All treatments were generally well tolerated.

  1. Phase transition and optoelectronic properties of MgH2

    Nayak, Vikas; Verma, U. P.


    In this article, structural and electronic properties of MgH2 have been studied. The aim behind this study was to find out the ground state crystal structure of MgH2. For the purpose, density functional theory (DFT)-based full-potential linearized augmented plane wave (FP-LAPW) calculations have been performed in three different space groups: P42/mnm (α-MgH2), Pa3 (β-MgH2) and Pbcn (γ-MgH2). It has been found that the ground state structure of MgH2 is α-MgH2. The present study shows that α-MgH2 transforms into γ-MgH2 at a pressure of 0.41 GPa. After further increase in pressure, γ-MgH2 transforms into β-MgH2 at a pressure of 3.67 GPa. The obtained results are in good agreement with previously reported experimental data. In all the studied phases, the behavior of MgH2 is insulating and its optical conductivity is around 6.0 eV. The α-MgH2 and γ-MgH2 are anisotropic materials while β-MgH2 is isotropic in nature.

  2. Substitution of Mn for Mg in MgB_2*

    Fitzpatrick, Michael D.; Johnston, David C.; Miller, Lance L.; Hill, Julienne M.


    The study of solid solutions in which the Mg in MgB2 is partially replaced by magnetic 3d or 4f atoms can potentially reveal important information on the superconducting state of MgB_2. As an end-member of the hypothetical Mg_1-xMn_xB2 system, MnB2 is isostructural with MgB2 and is an antiferromagnet below TN = 760 K which becomes canted at 157 K. A previous study by Moritomo et al.[1] examined the structure and properties of multi-phase samples with 0.01J. Phys. Soc. Japan b70, 1889 (2001).; “Effects of transition metal doping in MgB2 superconductor", Y. Moritomo at al. arXiv:cond-mat/0104568.

  3. Perbandingan Efektivitas Pemberian Efedrin Oral Dosis 25 mg dengan 50 mg Preoperatif terhadap Kejadian Hipotensi Pascaanestesi Spinal pada Seksio Sesarea

    Selly Oktarina Rosita


    Full Text Available Oral ephedrine is one alternative to prevent hypotension with less adverse effects. The purpose of this study was to determine the effective dose of oral ephedrine given 30–45 minutes before spinal anesthesia to reduce incidence of hypotension. The research was a single-blind randomized experimental study involving 32 pregnant women, ASA II, who underwent caesarean section with spinal anesthesia at Dr. Hasan Sadikin Hospital Bandung from March to May 2012. Subjects were divided into two groups, 25 mg ephedrine and 50mg ephedrine groups. Data was analyzed using Mann Whitney and chi-square test, p<0.05 was considered significant. Statistical analysis showed there was a significant difference (p=0.049 in incidence of hypotension between 25 mg group and 50mg group. 25mg group required more intravenous ephedrine after spinal anesthesia (p=0.040. The conclusion of this study was that oral 50mg ephedrine given 30–45 minutes before performing spinal anesthesia will reduce the incidence of hypotension after spinal anesthesia in comparison to oral 25mg ephedrine. In 25mg group, the amount of ephedrine intravenous administered is higher compared with 50mg group.

  4. Midazolam 12 mg is moderately counteracted by 250 mg caffeine in man.

    Mattila, M J; Vainio, P; Nurminen, M L; Vanakoski, J; Seppälä, T


    Caffeine (Caf) counteracts various effects of benzodiazepines (BZDs). Since the effects of zolpidem, a short-acting atypical GABA(A)-BZD agonist, were not antagonized by Caf, we studied an interaction between Caf and midazolam (Mid) in healthy volunteers. In Study 1, 108 healthy students divided to 6 parallel groups were given Mid 12 mg (capsule) and Caf 125 and 250 mg (in decaffeinated coffee), alone and in combinations in the double-blind placebo-controlled manner. Objective and subjective tests were done before and at 45 and 90 min after intake. Ranked delta-values (changes from baseline) were analyzed by one-way contrast ANOVA and Scheffe's tests. In Study 2, six healthy subjects took Mid 15 mg (tablet) with and without Caf 300 mg. The dynamic effects were analyzed as in Study 1 and the plasma concentrations were assayed. In Study 1, learn effects after placebo (ad + 15%) were seen for letter cancellation and digit symbol substitution tests. Midazolam alone significantly (p 0.05). In conclusion, in a parallel group study, sedative effects of Mid 12 mg were only moderately antagonized by Caf 250 mg but not by Caf 125 mg. In a cross-over study, a weak interaction was found subjectively but not in objective measures.

  5. Raman scattering study of α-MgH2 and γ-MgH2

    Kuzovnikov, M. A.; Efimchenko, V. S.; Filatov, E. V.; Maksimov, A. A.; Tartakovskii, I. I.; Ramirez-Cuesta, A. J.


    Two modifications of MgH2 have been studied by Raman spectroscopy: α-MgH2 with the P42/mnm space group and γ-MgH2 with the Pbcn space group. The latter was prepared from α-MgH2 by exposing it to a pressure of 5.6 GPa at 470 °C for 1.5 h. A comparison of the experimental spectra with ab-initio calculations allowed identification of a few phonon modes. A broad feature in the Raman spectrum of α-MgH2 in the range 1470-1790 cm-1 was identified as the B2g phonon mode. A Raman spectrum of γ-MgH2 consists of five discernible peaks at 186 cm-1, 313 cm-1, 509 cm-1, 660 cm-1, 706 cm-1 and of three broad features in the regions 890-980 cm-1, 1010-1220 cm-1 and 1240-1430 cm-1. The peaks are identified as the 1Ag (186 cm-1), 3B3g (509 cm-1), 2Ag (660 cm-1) and 3B1g (706 cm-1) phonon modes.

  6. Adsorption of arginine, glycine and aspartic acid on Mg and Mg-based alloy surfaces: A first-principles study

    Fang, Zhe; Wang, Jianfeng; Yang, Xiaofan; Sun, Qiang; Jia, Yu; Liu, Hairong; Xi, Tingfei; Guan, Shaokang


    Studying the adsorption behaviors of biomolecules on the surface of Mg and Mg-based alloy has a fundamental and important role for related applications in biotechnology. In the present work, we systematically investigate and compare the adsorption properties of three typical amino acids, i.e., Arg (arginine), Gly (glycine) and Asp (aspartic acid), which form RGD tripeptide, on the Mg (0 0 0 1) surface with various doping (Zn, Y, and Nd), and aim to realize proper binding between biomolecules and Mg and Mg-based biomedical materials. Our results show that flat adsorption configurations of the functional groups binding to the surfaces are favored in energy for all the three selected amino acids. In specific, for the amino acids adsorped on clean Mg (0 0 0 1) surface, the adsorption energy (Eads) of Arg is found to be -1.67 eV for the most stable configuration, with amino and guanidyl groups binding with the surface. However, Gly (Asp) is found to binding with the surface through amino and carboxyl groups, with a -1.16 eV (-1.15 eV) binding energy. On the 2% Zn doped Mg (0 0 0 1) alloy surface (Mg-Zn (2%)), the Eads are significantly increased to be -1.91 eV, -1.32 eV and -1.35 eV for Arg, Gly and Asp, respectively. While the Mg-Y (1%) and Mg-Nd (1%) slightly weaken the adsorption of three amino acids. Moreover, we have performed detail discussions of the binding properties between amino acids and surfaces by projected density of states (PDOS) combined with charge transfer analyses. Our studies provide a comprehensive understanding on the interactions between amino acids and Mg and Mg-based alloy surfaces, with respect to facilitate the applications of Mg and Mg-based biomedical alloys in biosensing, drug delivery, biomolecule coating and other fields in biotechnology.

  7. Zolpidem 10 mg given at daytime is not antagonized by 300 mg caffeine in man.

    Mattila, M J; Nurminen, M L; Vainio, P; Vanakoski, J


    Caffeine counteracts various effects of traditional benzodiazepines (BZDs). As zolpidem, a short-acting hypnotic, is an atypical GABAA-BZD agonist, we investigated when caffeine would counteract the effects of zolpidem as well. In daytime study I, zolpidem 10 mg (capsule) and caffeine 150 or 300 mg (in decaffeinated coffee) were given, alone and in combinations, to parallel groups (n = 15-17) of healthy students in double-blind and placebo-controlled manner. Objective and subjective tests were done before and 45 min and 90 min after intake. Ranked delta values (changes from baseline) were analysed by one-way contrast ANOVA and Scheffe's tests. In daytime study II, four healthy subjects took zolpidem 10 mg alone, and together with blinded caffeine 250 mg or (at -45 min) erythromycin 750 mg. Objective and subjective effects were measured and plasma zolpidem concentrations assayed at baseline and 45 min and 90 min after zolpidem intake. In study I, practice effects after placebo (ad + 30%) were seen for letter cancellation and digit symbol substitution but not for flicker fusion tests. Zolpidem alone significantly impaired (P effects of zolpidem and either dose of caffeine matched those measured after zolpidem alone. Zolpidem + caffeine 300 mg was not stronger than zolpidem + caffeine 150 mg in impairing immediate memory and causing subjective sedation. In study II, zolpidem caused objective and subjective sedation; neither caffeine nor erythromycin modulated the effects of zolpidem or plasma zolpidem concentrations. The sedative effects of 10 mg of zolpidem are not antagonized by 150-300 mg of caffeine in pharmacodynamic or pharmacokinetic terms.

  8. Atomic Structure of Ca40+xMg25Cu35-x Metallic Glasses (Preprint)


    13 Approved for public release; distribution unlimited fivefold bonds, with local atom arrangements very similar to the competing Mg2Cu ( Laves phase ...Ca50Mg25Cu25 alloys forms three equally probable crystal phases , CaMg2 Cu2Mg and CaCu [5,6]. CaMg2 is a hexagonal Laves phase (space group P63/mmc...containing 12 Mg and 4 Ca atoms in the first shell. Cu2Mg is a cubic Laves phase (space group is Fd-3m, space group number 227) with the lattice


    Head Librarian


    The wide variety of scientific and technical activity engaged in by people working at CERN means that the Library cannot always provide a deep on-site coverage in areas which are outside the core subjects of particle physics and accelerators. As many of you have already experienced, one way of solving this is to borrow books from other libraries. Our Inter-Library Loan (ILL) service currently obtains about 1000 books on loan per year for readers at CERN. However, there may be books which groups need on a more permanent basis, in which case a loan from either our own collection or via ILL is not the appropriate solution. Instead, groups might prefer to purchase such books from their own budgets. To facilitate this, the CERN Library has set up a procedure with the SPL Division, by which you can submit your purchase request to us and be charged via a TID when you receive the book. In addition, via our database interface WebLib, we can provide you with a private virtual catalogue of your group's collection, which...

  10. Mg spin affects adenosinetriphosphate activity

    Tulub, Alexander A


    The Schlegel-Frisch ab initio molecular dynamics (ADMP) (DFT:B3LYP), T = 310 K, is used to study complexation between adenosinetriphosphate (ATP), ATP subsystem, and magnesium cofactor [Mg(H2O)6]2+, Mg subsystem, in a water pool, modeled with 78 water molecules, in singlet (S) and triplet (T) states. The computations prove that the way of ATP cleavage is governed by the electron spin of Mg. In the S state Mg prefers chelation of \\gamma-\\beta-phosphate oxygens (O1-O2), whereas in the T state it chelates \\beta-\\alpha-phosphate oxygens (O2-O3) or produces a single-bonded intermediate. Unlike the chelates, which initiate ionic reaction paths, the single-bonded intermediate starts off a free-radical path of ATP cleavage, yielding a highly reactive adenosinemonophosphate ion-radical, .AMP-, earlier observed in the CIDNP (Chemically Induced Dynamic Nuclear Polarization) experiment (A.A. Tulub, 2006). The free-radical path is highly sensitive to Mg nuclear spin, which through a hyperfine interaction favors the produc...

  11. Individ og gruppe i forandringens tid

    Lading, Aase


    Artiklen handler om individuelle og gruppeorienterede reaktioner på de professionelle og personlige krav, som stilles til mennesker på en arbejdsplads, der gennemgår omfattende  forandringer. Den viser, hvordan individet i forhold til gruppen får stor betydning, når velkendte rutiner nedbrydes og...

  12. Tv-serien som vor tids roman?

    Nielsen, Jakob Isak


    Artiklen gør rede for de forbindelseslinjer, der er mellem den nyere amerikanske tv-serie og en række andre udtryksformer (fx radiospillet og spillefilmen) for dernæst at fokusere på tv-seriens slægtskab med romanen. Alene i Danmark har såvel kulturjournalister som forskere påpeget ligheder de...... to udtryksformer imellem, og artiklen vil forsøge at skabe et overblik over berøringsfladerne og parallellerne. Artiklens tese er, at sammenligningen er gangbar i forhold til en række parametre – særligt hvis man indsnævrer de i udgangspunktet temmelig heterogene og vidtfavnende udtryksformer ”romanen” og ”tv......-serien” og fokuserer på bestemte eksempler og strømninger samt på bestemte distributions-, brugs- og oplevelsesformer (særligt DVD-udgivelsen ifm. tv-serier fx). Eksemplerne er primært fra en række nyere amerikanske tv-serier fra The Sopranos (HBO, 1999-2007) og frem, og artiklen vil afslutningsvist påpege...

  13. Tid til at optrappe i Ukraine

    Nielsen, Kristian L.


    Man redder ingen menneskeliv ved at nægte ukrainerne midler til at forsvare sig selv. Man vinder ikke en krig med tæpper, som præsident Petro Porosjenko fortalte den amerikanske kongres i september....

  14. Genstande fra middelalder og nyere tid


    Finds from Aggersborg: selection of artefacts from the medieval and later periods: soap-stone plaque, window-glass and drinking-vessels, rush-holder and decorative mount, pottery, foot of copper-alloy cauldron, handles, lacing-pin, coins, scabbard-mount and mount from kidney dagger, arrow...

  15. Tid i sprog. Aktionsartteoriernes fire grundpiller

    Volkmar Engerer


    Full Text Available Dieser Beitrag beschäftigt sich mit Aktionsarten und dem heutigen Theoriestand auf diesem Gebiet. Es werden nicht eigentlich neue Ergebnisse der Aktionsartforschung präsentiert, vielmehr werden die neueren Theorien daraufhin untersucht, inwieweit ihr Design den Prämissen und Erfordernissen der modernen Sprach- und Grammatiktheorie entspricht. Meine These ist, dass die neuen Theorien von Aktionsart zwei traditionell unversöhnliche Forschungsparadigmen, die universalistische und die morphologische Sicht auf Aktionsarten, in Bezug auf Aktionsart überwunden und in ihrer Synthese gleichzeitig die sprachtheoretisch relevanten Annahmen der jeweiligen Extremposition in einem integrierten theoretischen Rahmen bewahrt haben. Diese Vereinigung bzw. Versöhnung zwischen diesen beiden Positionen hat, wie ich zeige, zu einer Reihe gemeinsamer Züge in ansonsten sehr verschiedenen Aktionsarttheorien geführt. In diesem Beitrag arbeite ich vier dieser "Grundpfeiler" heraus. Einmal "beschränkter Universalismus", der den Blick von der unendlichen Vielfalt ontologischer Aktionsartunterscheidungen auf die (beschränkte Vielfalt sprachlicher Ausrücke und deren kognitive Relevanz lenkt. Der zweite Pfeiler kann als "grammatische Relevanz" gut auf den Nenner gebracht werden, weil er Aktionsarten als grammatisch-systemische Spracheinheiten rehabilitiert. Die dritte Haupteigenschaft moderner Aktionsarttheorien bezeichne ich als "Aktionsart-Reduktionismus", womit ich die Konsequenz andeute, dass Aktionsarten ein zureichender Abstraktionsgrad als grammatische Einheiten zukommen muss, wenn sie universell in den Sprachen der Welt aufscheinen sollen. Der letzte Grundpfeiler schließlich ist "syntaktische Aktionsart", welche Aktionsart in den syntaktischen Aufbau höherer Konstituenten integriert mit einbezieht und sie damit zu einem grammatischen, alle Ebenen des Sprachsystems durchziehenden Phänomen macht.

  16. Konfliktens anatomi i en postavantgardistisk tid

    Simonsen, Karen Margrethe


    Postavantgardistisk kunst kræver en gentænkning af det politiske. Artiklen diskuterer, ud fra en analyse af to værker af Pablo Henrik Llambías, hvilke betingelser moderne (relationelle) værker  kan sætte for denne. Udgangspunktet er henholdsvis Chantal Mouffe og Ernesto Laclaus hegemoni- og konfl...... konflikttænkning og Fredric Jamesons kontradiktionsbegreb, som udvikles inden for en forpligtende totalitet. Undervejs inddrages Nicolas Bourriauds begreb om den relationelle kunst....

  17. Tid og velfærd

    Bonke, Jens

    Gennem interview med 2.700 danskere og udfyldelse af 6.600 dagbøger giver denne rapport en beskrivelse af danskernes tidsanvendelse i 2001, og der sammenlignes med resultaterne fra en lignende undersøgelse i 1987. Hvilke aktiviteter er danskere involveret i, hvor ofte foretages de, og hvor lang t...

  18. Uraanikütid / Malte Henk

    Henk, Malte


    Kasahstani Tuumafüüsika Instituudist viiakse reaktorikütus tuumajäätmete ümbertöötlemistehasesse Majak ühes Venemaa kinnises linnas. Geo ajakirjanikud veetsid nädala inimestega, kes seda tööd teevad

  19. Manglende tid og ændret livsstil

    Hansen, Karina Birch


    smitter tydeligvis af på de valg af fødevarer, der foretages i de danske supermarkeder. Her foretrækker flere og flere hurtige retter eller egentlige færdigretter. Sammenlignet med andre EU-lande ligger Danmark fortsat lavere, hvad angår forbrugernes interesse for convenience-produkter og færdigretter...

  20. Konfliktens anatomi i en postavantgardistisk tid

    Simonsen, Karen Margrethe


    Postavantgardistisk kunst kræver en gentænkning af det politiske. Artiklen diskuterer, ud fra en analyse af to værker af Pablo Henrik Llambías, hvilke betingelser moderne (relationelle) værker  kan sætte for denne. Udgangspunktet er henholdsvis Chantal Mouffe og Ernesto Laclaus hegemoni- og konfl...

  1. Debye Temperature of the MgCNi3 Superconductor

    魏志锋; 陈小龙; 王福明; 李文超; 贺蒙


    We have determined the Debye temperature of the MgCNi3 superconductor by using the Rietveld refinementmethod based on the powder x-ray diffraction data. MgCNi3 crystallizes in the cubic perovskite structure with space group Pm-3m and lattice constant a = 3.8089 . The temperature factors of the atoms Mg, C and Ni are 0.52, 0.45 and 0.44, respectively. The Debye temperature of MgCNi3 is calculated to be θD = 440K.

  2. Mg K-edge XANES of sepiolite and palygorskite

    Sanchez del Rio, M. [ESRF, BP 220 F-38043 Grenoble Cedex (France)]. E-mail:; Suarez, M. [Dpto. Geologia, Universidad de Salamanca, E-37008 Salamanca (Spain); Garcia Romero, E. [Dpto. Cristalografia y Mineralogia, U. Complutense de Madrid, E-28040 Madrid (Spain); Alianelli, L. [INFM, c/o ESRF, BP 220 F-38043 Grenoble Cedex (France); Felici, R. [INFM, c/o ESRF, BP 220 F-38043 Grenoble Cedex (France); Martinetto, P. [Lab. Cristallographie, CNRS, Grenoble BP 166, F-38042 Grenoble Cedex 09 (France); Dooryhee, E. [Lab. Cristallographie, CNRS, Grenoble BP 166, F-38042 Grenoble Cedex 09 (France); Reyes-Valerio, C. [INAH, Mexico DF (Mexico); Borgatti, F. [TASC-INFM Area Science Park, I-34012 Trieste (Italy); Doyle, B. [TASC-INFM Area Science Park, I-34012 Trieste (Italy); Giglia, A. [TASC-INFM Area Science Park, I-34012 Trieste (Italy); Mahne, N. [TASC-INFM Area Science Park, I-34012 Trieste (Italy); Pedio, M. [TASC-INFM Area Science Park, I-34012 Trieste (Italy); Nannarone, S. [TASC-INFM Area Science Park, I-34012 Trieste (Italy)


    We present a study of the Mg K-edge on sepiolite and palygorskite performed at the INFM BEAR beamline at Elettra synchrotron light source (Trieste). These two clays, although having very similar structures, show some different features in their near-edge. Mg is in octahedral coordination with oxygens, hydroxyl groups or water, for both palygorskite and sepiolite. The differences found in the near-edge seem to reflect the fact that, on average, an Mg atom in palygorskite 'sees' less Mg in higher coordination shells than sepiolite.


    Sikander A . K


    Full Text Available Macular edema is a frequent manifestation of diabetic retinopathy and animportant cause of visual disturbance in diabetic patients. AIM: To compare the efficacy and safety of 1mg and 4mg intravitreal triamcinolone acetonide (IVTA in the management of diabetic macular edema. SETTING: Sarojini Devi Eye Hospital, Hyderabad. MATERIAL AND METHODS: 42 eyes of 42 patients with diabetic macular edema were randomly assigned torecei ve either 1 - mg or 4 - mg dose of Intravitreal triamcinolone acetonide (IVTA. Each patient underwent a complete comprehensive eye examination at baseline andat each visit.Fundus fluorescein angiography and optical coherence angiographywas done at baseline an d at 1, 3 and 6 months.BCVA, lens status, IOP wererecorded at each follow up visit. Each patient’s BCVA was measured in snellen’s lines and converted into logarithm of minimum angle of resolution (log MAR scale for analysis. STATISTICAL ANALYSIS USED : The data were statistically evaluated using the Wilcoxon signedrank test, Mann - Whitney test and t tests wherever applicable. A p value of lessthan . 05 was considered significant. RESULTS: There was no statistically significant difference in the mean foveal thickness measurement at baseline (p=.723 or at 3 rd month (p=.878 between the sub - groups. BCVA significantly improved from baseline to subsequent visits in both the groups, but there was no statistically significant difference observed in the mean baseli ne BCVA between the two sub - groups (p=.754. There was no statistically significant difference observed in IOP between the two sub - groups at any follow up visit. CONCLUSIONS: The results of our study suggest that 1 - mg dose of IVTA is as effective as 4 - mgdo se of IVTA in improving the functional and anatomical outcome in macularedema associated with diabetic retinopathy.

  4. CsMgPO4

    Nikolay S. Slobodyanik


    Full Text Available Caesium magnesium orthophosphate is built up from MgO4 and PO4 tetrahedra (both with . m. symmetry linked together by corners, forming a three-dimensional framework. The Cs atoms have .m. site symmetry and are located in hexagonal channels running along the a- and b-axis directions.

  5. Atualização sobre comorbidade entre transtorno do déficit de atenção e hiperatividade (TDAH e transtornos invasivos do desenvolvimento (TID Update on the comorbidity of attention-deficit/hyperactivity disorder (ADHD and pervasive developmental disorder (PDD

    Daniel Segenreich


    Full Text Available CONTEXTO: Atualmente, a comorbidade transtorno do déficit de atenção e hiperatividade (TDAH e transtornos invasivos do desenvolvimento (TID não pode ser estabelecida por meio dos critérios da DSM-IV. Entretanto, diversos pesquisadores questionam esta impossibilidade descrevendo quadros clínicos de pacientes que apresentam características de ambos os transtornos. Esta revisão busca estes achados e propõe uma reflexão sobre o assunto. OBJETIVO: Revisar, de modo seletivo, estudos mais significativos da literatura para compilar uma atualização sobre a comorbidade transtorno do déficit de atenção e hiperatividade (TDAH e transtornos invasivos do desenvolvimento (TID. MÉTODO: Por meio de busca no sistema Medline, selecionaram-se todos os artigos em inglês, publicados entre 2000 e 2005, sobre sintomas de TDAH em pacientes com TID, sintomas autistas em pacientes com TDAH e duplo diagnóstico TDAH/TID, utilizando-se os termos "ADHD", "pervasive", "autism", "ADD", "Asperger" e "PDD". RESULTADOS: Encontraram-se 10 artigos que atendiam aos critérios. Embora haja poucos estudos com amostras pequenas, diferentes autores identificaram um subgrupo distinto de pacientes com TID e maior freqüência e gravidade de sintomas de desatenção e hiperatividade, que aparentemente apresentam menor resposta ao tratamento com estimulantes. CONCLUSÃO: Embora o diagnóstico duplo TDAH e TID não seja corroborado pelo DSM-IV, alguns resultados sugerem que essa comorbidade não deva ser desconsiderada.BACKGROUND: Nowadays, the attention-deficit hyperactivity disorder/pervasive developmental disorder (ADHD/PDD comorbidity is not accepted by DSM-IV criteria. However, researchers from both areas put in check this impossibility and describe patients who have both clinical aspects from attention-deficit hyperactivity disorder (ADHD and pervasive developmental disorder (PDD. In this article we search for this findings proposing new insights on this assumption

  6. The van der Waals potentials of MgCa, MgSr, MgBa, CaSr, CaBa, and SrBa

    Wei, L. M.; Li, P.; Tang, K. T.


    Based on the facts that the potential energy curves of the homo-nuclear group 2 dimers (group IIA metal), except Be2, are conformal, and they can be described by the Tang-Toennies potential model, a set of simple combining rules are proposed for the parameters of the reduced potentials of the hetero-nuclear dimers. Together with the well-established combining rules of the range parameters of the exponential repulsion and the known dispersion coefficients, these rules enable us to determine the ground state potential energy curves of MgCa, MgSr, MgBa, CaSr, CaBa, and SrBa from those of Mg2, Ca2, Sr2, and Ba2. The determined potentials are comparable to some ab initio calculations and in excellent agreement with the experiment.

  7. Effect of the partial substitution of Mg by Al on the crystal structure and hydrogenation behavior of La2Mg17

    ZHANG Qing'an; WANG Changchun; SI Tingzhi


    The effect of the partial substitution of Mg by Al on the crystal structure of La2Mg17 has been investigated. It was found that the La2Mg17 phase disappears after the partial substitution of Mg by Al. The La2(Mg0.9Al0.1)17 alloy contains La(Mg,Al)12 and La(Mg,Al)2. Further increasing the Al content, the La2(Mg0.8Al0.2)17 alloy consists of La(Mg,Al)12, La(Mg,Al)2, and Mg. The La(Mg0.93Al0.07)12 phase in the La2(Mg0.9Al0.1)17 alloy crystallizes with the ThMn12-type structure in space group I4/mmm (No.139). The lattice parameters were determined to be a = 1.03246(7) nm and c = 0.59410(6) nm. In the ThMn12-type structure, Al atoms occupy 8f site but the Al content is limited. Moreover, the hydrogenation characteristics have also been compared. La2Mg17 decomposes into LaH3 and MgH2 under hydrogen, but the La(Mg0.93Al0.07)12 phase can be hydrogenated into LaH3, MgH2, and La3Al11 at 473 K.

  8. Improved efficacy of intramuscular weekly administration of clodronate 200 mg (100 mg twice weekly) compared with 100 mg (once weekly) for increasing bone mineral density in postmenopausal osteoporosis.

    Frediani, Bruno; Bertoldi, Ilaria; Pierguidi, Serena; Nicosia, Antonella; Picerno, Valentina; Filippou, Georgios; Cantarini, Luca; Galeazzi, Mauro


    Clodronate is a bisphosphonate used for the treatment of postmenopausal osteoporosis and all conditions characterized by excess bone resorption. We have previously reported that intramuscular (IM) therapy with clodronate at a dose of 100 mg/week displays significant effects on bone mineral density (BMD) although a plateau effect is observed after 1 year of treatment. Previous reports indicate that the densitometric effects of bisphosphonates directly correlate with the drug dosage and suggest that using IM clodronate at doses higher than 100 mg/week may result in improved efficacy. However, to the best of our knowledge, this has never been proved. The primary endpoint of the study was the effect on BMD of IM clodronate 100 mg once weekly or 100 mg twice weekly in patients with postmenopausal osteoporosis. The incidence of non-traumatic vertebral fractures and adverse events was also reported. The present study was a randomized, open-label, parallel-group trial conducted between January 2007 and December 2009 in the Osteoporosis and Osteoarticular Instrumental Diagnosis Centre (University of Siena, Siena, Italy). The study involved 60 women, aged 57-78 years, with a history of postmenopausal osteoporosis for more than 5 years. Patients were randomized to receive IM clodronate 100 mg once weekly (Group A, 30 patients) or 100 mg twice weekly (Group B, 30 patients), for 2 years. Significant increases compared with baseline in BMD were observed for both groups at 1 and 2 years, with significantly higher increases for Group B compared with Group A. Group B displayed a BMD increase (± SD) at the lumbar spine of +4.0 % (± 2.1) and +5.9 % (± 2.0) at 1 and 2 year(s), respectively, compared with +2.8 % (± 1.7) and +3.5 % (± 2.2), respectively, observed for Group A. Similarly, Group B showed better performance compared with Group A for BMD increase at the femoral neck, with an observed increase of +3.5 % (± 1.7) and +5.4 % (± 1.8) at 1 and 2 year(s), respectively

  9. Decay rate of reindeer pellet-groups

    Anna Skarin


    Full Text Available Counting of animal faecal pellet groups to estimate habitat use and population densities is a well known method in wildlife research. Using pellet-group counts often require knowledge about the decay rate of the faeces. The decay rate of a faecal pellet group may be different depending on e.g. substrate, size of the pellet group and species. Pellet-group decay rates has been estimated for a number of wildlife species but never before for reindeer (Rangifer tarandus. During 2001 to 2005 a field experiment estimating the decay rate of reindeer pellet groups was performed in the Swedish mountains close to Ammarnäs. In total the decay rate of 382 pellet groups in three different habitat types (alpine heath, birch forest and spruce forest was estimated. The slowest decay rate was found in alpine heath and there the pellet groups persisted for at least four years. If decay was assumed to take place only during the bare ground season, the estimated exponential decay rate was -0.027 pellet groups/week in the same habitat. In the forest, the decay was faster and the pellet groups did not persist more than two years. Performing pellet group counts to estimate habitat use in dry habitats, such as alpine heath, I will recommend using the faecal standing crop method. Using this method makes it possible to catch the animals’ general habitat use over several years. Abstract in Swedish / Sammanfattning:Nedbrytningshastighet av renspillningInom viltforskningen har spillningsinventeringar använts under flera årtionden för att uppskatta habitatval och populationstäthet hos olika djurslag. För att kunna använda data från spillningsinventeringar krävs ofta att man vet hur lång tid det tar för spillningen att brytas ner. Nedbrytningshastigheten är olika beroende på marktyp och djurslag. Nedbrytningshastighet på spillning har studerats för bland annat olika typer av hjortdjur, men det har inte studerats på ren (Rangifer tarandus tidigare. I omr

  10. Methylglyoxal (MG) and cerebro-renal interaction: does long-term orally administered MG cause cognitive impairment in normal Sprague-Dawley rats?

    Watanabe, Kimio; Okada, Kana; Fukabori, Ryoji; Hayashi, Yoshimitsu; Asahi, Koichi; Terawaki, Hiroyuki; Kobayashi, Kazuto; Watanabe, Tsuyoshi; Nakayama, Masaaki


    Methylglyoxal (MG), one of the uremic toxins, is a highly reactive alpha-dicarbonyl compound. Recent clinical studies have demonstrated the close associations of cognitive impairment (CI) with plasma MG levels and presence of kidney dysfunction. Therefore, the present study aims to examine whether MG is a direct causative substance for CI development. Eight-week-old male Sprague-Dawley (SD) rats were divided into two groups: control (n = 9) and MG group (n = 10; 0.5% MG in drinking water), and fed a normal diet for 12 months. Cognitive function was evaluated by two behavioral tests (object exploration test and radial-arm maze test) in early (4-6 months of age) and late phase (7-12 months of age). Serum MG was significantly elevated in the MG group (495.8 ± 38.1 vs. 244.8 ± 28.2 nM; p < 0.001) at the end of study. The groups did not differ in cognitive function during the course of study. No time-course differences were found in oxidative stress markers between the two groups, while, antioxidants such as glutathione peroxidase and superoxide dismutase activities were significantly increased in the MG group compared to the control. Long-term MG administration to rats with normal kidney function did not cause CI. A counter-balanced activation of the systemic anti-oxidant system may offset the toxicity of MG in this model. Pathogenetic significance of MG for CI requires further investigation.

  11. Mg2+ coordination in catalytic sites of F1-ATPase.

    Weber, J; Hammond, S T; Wilke-Mounts, S; Senior, A E


    Coordination of the Mg2+ ion in Mg-nucleotide substrates by amino acid residue side chains in the catalytic site of Escherichia coli F1-ATPase was investigated. From the X-ray structure of the mitochondrial enzyme [Abrahams, J. P., Leslie, A. G. W., Lutter, R., and Walker, J. E. (1994) Nature 370, 621-628], it may be inferred that the hydroxyl of betaThr-156 is a direct ligand of Mg2+, whereas the carboxyls of betaGlu-181, betaGlu-185, and betaAsp-242 might contribute via intervening water molecules. Elimination of each respective functional group by site-directed mutagenesis, followed by determination of Mg-nucleotide and uncomplexed nucleotide binding affinities using a tryptophan probe, showed that betaThr-156, betaGlu-185, and betaAsp-242 are all involved in Mg2+ coordination, whereas betaGlu-181 is not. A derived structural model for the octahedral coordination around the Mg2+ ion is presented. The results indicate that the ADP-containing site in the X-ray structure is the catalytic site of highest affinity. Correct Mg2+ coordination is required for catalytic activity at physiological rates. Elimination of any one of the Mg2+-coordinating residues led to complete loss of Mg2+-dependent nucleotide binding cooperativity of the catalytic sites.

  12. Volatile magnesium octahydrotriborate complexes as potential CVD precursors to MgB2. Synthesis and characterization of Mg(B3H8)2 and its etherates.

    Kim, Do Young; Yang, Yu; Abelson, John R; Girolami, Gregory S


    The solid-state reaction of MgBr2 and NaB3H8 at 20 degrees C, followed by sublimation at 80 degrees C and 0.05 Torr, affords Mg(B3H8)2 as a white solid. Similar reactions with MgBr2(Et2O) and MgBr2(Me2O)1.5 afford the crystalline ether adducts Mg(B3H8)2(Et2O)2 and Mg(B3H8)2(Me2O)2, respectively. In contrast, reactions of MgBr2 with NaB3H8, the presence of excess solvent result in the formation of nonvolatile, probably ionic, magnesium compounds of the type [MgLx][B3H8]2. The adducts Mg(B3H8)2(Et2O)2 and Mg(B3H8)2(Me2O)2 are the first crystallographically characterized magnesium complexes of the B3H8- ligand; in both structures, the magnesium center adopts a distorted cis-octahedral geometry with two bidentate B3H8 groups and two Et2O ligands. Owing to their volatility, Mg(B3H8)2(Et2O)2 and Mg(B3H8)2(Me2O)2 are potential precursors for the deposition of MgB2 thin films, although preliminary efforts to employ them as chemical vapor deposition sources produce boron-rich MgBx films instead, with x approximately 7. Finally, the synthesis and structure of Cp2Mg(thf) are described: this mono-thf adduct of Cp2Mg bears two eta5-Cp groups, unlike other Lewis base adducts of Cp2Mg, which contain one eta5-Cp group and one eta1- or eta2-Cp group.

  13. A 0.18 micrometer CMOS Thermopile Readout ASIC Immune to 50 MRAD Total Ionizing Dose (SI) and Single Event Latchup to 174MeV-cm(exp 2)/mg

    Quilligan, Gerard T.; Aslam, Shahid; Lakew, Brook; DuMonthier, Jeffery J.; Katz, Richard B.; Kleyner, Igor


    Radiation hardened by design (RHBD) techniques allow commercial CMOS circuits to operate in high total ionizing dose and particle fluence environments. Our radiation hard multi-channel digitizer (MCD) ASIC (Figure 1) is a versatile analog system on a chip (SoC) fabricated in 180nm CMOS. It provides 18 chopper stabilized amplifier channels, a 16- bit sigma-delta analog-digital converter (SDADC) and an on-chip controller. The MCD was evaluated at Goddard Space Flight Center and Texas A&M University's radiation effects facilities and found to be immune to single event latchup (SEL) and total ionizing dose (TID) at 174 MeV-cm(exp 2)/mg and 50 Mrad (Si) respectively.

  14. Formation of Mg2Ni with enhanced kinetics: Using MgH2 instead of Mg as a starting material

    Zhao, Bin; Fang, Fang; Sun, Dalin; Zhang, Qingan; Wei, Shiqiang; Cao, Fenglei; Sun, Huai; Ouyang, Liuzhang; Zhu, Min


    At a temperature over the decomposition point (375 °C) of MgH2, the formation of Mg2Ni is greatly enhanced from the 2MgH2+Ni system, as compared to the 2Mg+Ni system. In support of this finding, in-situ observation of X-ray absorption fine structure of the two systems indicates that MgNi bonds form faster in the 2MgH2+Ni system than in the 2Mg+Ni system. Furthermore, theoretical modeling also shows that Mg atoms are readily released from MgH2 using much less energy and thus are more available to react with Ni once the dehydrogenation of MgH2 occurs, as compared to normal Mg.

  15. Thermodynamic modeling of the La-Mg-Y system and Mg-based alloys database

    DU Zhenmin; GUO Cuiping; LI Changrong; ZHANG Weijing


    As an example of the La-Mg-Y system, the method how to set up the thermodynamic model of individual phases was introduced in the process of thermodynamic optimization. The solution phases (liquid, body-centered cubic,face-centered cubic, hexagonal close-packed and double hexagonal close-packed) were modeled with the Redlich-Kister equation. The compound energy model has been used to describe the thermodynamic functions of the intermetallic compounds in the La-Mg-Y systems. The compounds Mg2Y, Mg24Y5, Mg12La, Mg17La2, Mg41La5, Mg3La and Mg2La in the La-Mg-Y system were treated as the formulae (Mg, Y)2(La,Mg, Y), Mg24(La,Mg, Y)4Y, Mg12(La, Y), Mg17(La, Y)2,Mg41(La,Y)5, Mg3(La,Mg,Y) and Mg2(La,Y), respectively. A model (La,Mg,Y)0.5(La,Mg,Y)0.5 was applied to describe the compound MgM formed by MgLa and MgY in order to cope with the order-disorder transition between body-centered cubic solution (A2) and MgM with CsCl-type structure (B2) in the La-Mg-Y system. The Gibbs energies of individual phases were optimized in the La-Mg, La-Y and La-Mg-Y systems by CALPHAD technique. The projection of the liquidus surfaces for the La-Mg-Y system was predicted. The Mg-based alloys database including 36 binary and 15 ternary systems formed by Mg, Al, Cu, Ni, Mn, Zn and rare earth elements was set up in SGTE standard.

  16. Mg-based compounds for hydrogen and energy storage

    Crivello, J.-C.; Denys, R. V.; Dornheim, M.; Felderhoff, M.; Grant, D. M.; Huot, J.; Jensen, T. R.; de Jongh, P.; Latroche, M.; Walker, G. S.; Webb, C. J.; Yartys, V. A.


    Magnesium-based alloys attract significant interest as cost-efficient hydrogen storage materials allowing the combination of high gravimetric storage capacity of hydrogen with fast rates of hydrogen uptake and release and pronounced destabilization of the metal-hydrogen bonding in comparison with binary Mg-H systems. In this review, various groups of magnesium compounds are considered, including (1) RE-Mg-Ni hydrides (RE = La, Pr, Nd); (2) Mg alloys with p-elements (X = Si, Ge, Sn, and Al); and (3) magnesium alloys with d-elements (Ti, Fe, Co, Ni, Cu, Zn, Pd). The hydrogenation-disproportionation-desorption-recombination process in the Mg-based alloys (LaMg12, LaMg11Ni) and unusually high-pressure hydrides synthesized at pressures exceeding 100 MPa (MgNi2H3) and stabilized by Ni-H bonding are also discussed. The paper reviews interrelations between the properties of the Mg-based hydrides and p- T conditions of the metal-hydrogen interactions, chemical composition of the initial alloys, their crystal structures, and microstructural state.

  17. A Prevenção do HIV / AIDS segundo o olhar das mulheres: o caso do Grupo de Direitos Reprodutivos em Juiz de Fora / MGª La prevencíon del HIV/SIDA según el punto de vista de las mujeres: el caso del grupo de derechos reproductivos en Juiz de Fora / MG, Brasil HIV/AIDS prevention according to womens view: the reproductive rights group case in Juiz de Fora / MG, Brazil

    Elenir Pereira de Paiva


    ção, as estatísticas indicam aumento significativo de mulheres infectadas pelo HIV. Os objetivos foram: 1 identificar as informações que as participantes do Grupo de Direitos Reprodutivos possuem sobre as formas de prevenção contra HIV/AIDS; 2 identificar estratégias de prevenção contra o HIV/AIDS que as mulheres do Grupo de Direitos Reprodutivos adotam em sua prática sexual; 3 analisar as formas de prevenção contra o HIV/AIDS adotadas pelas mulheres do Grupo de Direitos Reprodutivos no Departamento de Urgência e Emergência Norte (DUEN em Juiz de Fora- MG. Metodologia: privilegiou-se a pesquisa qualitativa, sob a forma de estudo de caso², oriundas do grupo de discussão mencionado. Para coleta de dados, empregou-se a entrevista semi-estruturada, juntamente com observação participante³ com registro em diário de campo. Os resultados sugerem que as participantes ainda mantêm perplexidades quanto às formas de transmissão do HIV, prosseguem representando a AIDS como doença perigosa e incurável4 e, a despeito de valorizarem o preservativo como mecanismo de prevenção, encontram resistência dos parceiros no que concerne ao uso do mesmo. O grupo refere não adotar métodos preventivos de forma contínua. Teorias de aprendizagem5 foram analisadas com o objetivo de conhecer em qual tipo de aprendiz estamos trabalhando. Ao final apresentam-se algumas considerações e sugestões, tendo em vista tornar mais efetivas as ações educativas nesta área da saúde pública.

  18. Gastroduodenal tolerance of 75 mg clopidogrel versus 325 mg aspirin in healthy volunteers. A gastroscopic study.

    Fork, F T; Lafolie, P; Tóth, E; Lindgärde, F


    Clopidogrel is a new antiplatelet agent that offers increased protection over aspirin in preventing vascular ischaemic events in patients with symptomatic atherosclerosis. In a large, randomized, international study of clopidogrel and aspirin (n = 19,185 patients) clopidogrel was associated with a lower incidence of gastrointestinal adverse events, including gastrointestinal haemorrhage and hospitalizations because of gastrointestinal haemorrhage. The aim of the study was to determine whether macroscopic differences in the gastric mucosa between aspirin- and clopidogrel-treated subjects could be detected by gastroscopy after short-term treatment. Thirty-six healthy volunteers were randomized in a double-blind, double-dummy, parallel design, to 75 mg/day of clopidogrel or 325 mg/day of aspirin for 8 days. Gastroscopy was performed at base line before administration of study drug and directly after treatment completion. Gastroduodenal effects were measured in accordance with a modified Lanza scale. At base line no difference between the groups was detected (median Lanza score, 0.0 in both groups). At the end of treatment the aspirin group showed a median score of 7.5, and the clopidogrel group showed an unchanged median score of 0.0 (P < 0.001). In the aspirin group 13 individuals reported 19 adverse events versus 8 individuals and 13 adverse events for clopidogrel, with approximately half of the adverse events being gastrointestinal in each group. No serious adverse events were reported. In contrast to aspirin, short-term treatment with clopidogrel does not induce macroscopic changes in the gastroduodenal mucosa. The study results show that in patients without gastroduodenal disease clopidogrel, but not aspirin, does not induce any gastroscopically evident erosions during short-term treatment.

  19. Preparation and Hydrogen Storage Properties of Mg-Rich Mg-Ni Ultrafine Particles

    Jianxin Zou


    Full Text Available In the present work, Mg-rich Mg-Ni ultrafine powders were prepared through an arc plasma method. The phase components, microstructure, and hydrogen storage properties of the powders were carefully investigated. It is found that Mg2Ni and MgNi2 could be obtained directly from the vapor state reactions between Mg and Ni, depending on the local vapor content in the reaction chamber. A nanostructured MgH2 + Mg2NiH4 hydrogen storage composite could be generated after hydrogenation of the Mg-Ni ultrafine powders. After dehydrogenation, MgH2 and Mg2NiH4 decomposed into nanograined Mg and Mg2Ni, respectively. Thermogravimetry/differential scanning calorimetry (TG/DSC analyses showed that Mg2NiH4 phase may play a catalytic role in the dehydriding process of the hydrogenated Mg ultrafine particles.

  20. Transitive conformal holonomy groups

    Alt, Jesse


    For $(M,[g])$ a conformal manifold of signature $(p,q)$ and dimension at least three, the conformal holonomy group $\\mathrm{Hol}(M,[g]) \\subset O(p+1,q+1)$ is an invariant induced by the canonical Cartan geometry of $(M,[g])$. We give a description of all possible connected conformal holonomy groups which act transitively on the M\\"obius sphere $S^{p,q}$, the homogeneous model space for conformal structures of signature $(p,q)$. The main part of this description is a list of all such groups which also act irreducibly on $\\R^{p+1,q+1}$. For the rest, we show that they must be compact and act decomposably on $\\R^{p+1,q+1}$, in particular, by known facts about conformal holonomy the conformal class $[g]$ must contain a metric which is locally isometric to a so-called special Einstein product.

  1. Highly (100) oriented MgO growth on thin Mg layer in MTJ structure

    Jimbo, K [Department of Physical Electronics, Tokyo Institute of Technology, 2-12-1-S3-42 O-okayama, Meguro, Tokyo 152-8552 (Japan); Nakagawa, S, E-mail:


    In order to apply Stress Assisted Magnetization Reversal (SAMR) method to perpendicular magnetoresistive random access memory (p-MRAM) with magnetic tunnel junction (MTJ) using MgO (001) oriented barrier layer, multilayer of Ta/ Terfenol-D/ Mg/ MgO and Ta/ Terfenol-D/ MgO were prepared. While the MgO layer, deposited directly on the Terfenol-D layer, did not show (100) orientatin, very thin metallic Mg layer, deposited prior to the MgO deposition, was effective to attain MgO (100) orientation. The crystalline orientation was very weak without Mg, however, the multilayer with Mg showed very strong MgO(100) peak and the MgO orientation was shifted depending on the Mg thickness.

  2. Fabrication and superconducting properties of internal Mg diffusion processed MgB2 wires using MgB4 precursors

    Xu, Da; Wang, Dongliang; Yao, Chao; Zhang, Xianping; Ma, Yanwei; Oguro, Hidetoshi; Awaji, Satoshi; Watanabe, Kazuo


    Monofilament MgB2/Nb/Monel wires were fabricated using three different MgB4 precursors by an internal Mg diffusion (IMD) process. The wire geometry and heat-treatment conditions were optimized in order to improve the critical current density (J c) of the MgB2 wire. The influences of the quality of MgB4 powders, such as the particle size and MgO impurity, on the microstructure and superconducting properties of the wires were discussed. Although there were small amounts of voids, unreacted MgB4 particles and MgO impurity existed in the superconducting layers, and the transport layer J c of the wire with the MgB4 precursor reached 3.0 × 104 A cm-2 at 4.2 K and 10 T, which was comparable to that of IMD-processed wires fabricated using boron precursors. Both the non-barrier J c and engineering J c of MgB2 wire made using a MgB4 precursor were enhanced due to the improved grain connectivity and the enlarged fill factor.

  3. Determination of the 36Mg(n ,γ )37Mg reaction rate from Coulomb dissociation of 37Mg

    Shubhchintak; Chatterjee, R.; Shyam, R.


    We use the Coulomb dissociation (CD) method to calculate the rate of the 36Mg(n ,γ )37Mg radiative capture reaction. The CD cross sections of the 37Mg nucleus on a 208Pb target at the beam energy of 244 MeV/nucleon, for which new experimental data have recently become available, were calculated within the framework of a finite-range distorted-wave Born approximation theory that is extended to include the projectile deformation effects. Invoking the principle of detailed balance, these cross sections are used to determine the excitation function and subsequently the rate of the 36Mg(n ,γ )37Mg reaction. We compare these rates to those of the 36Mg(α ,n )39Si reaction calculated within a Hauser-Feshbach model. We find that for T9 as large as up to 1.0 (in units of 109 K) the 36Mg(n ,γ )37Mg reaction is much faster than the 36Mg(α ,n )39Si one. The inclusion of the effects of 37Mg projectile deformation in the breakup calculations enhances the (n ,γ ) reaction rate even further. Therefore, it is highly unlikely that the (n ,γ )β -decay r -process flow will be broken at the 36Mg isotope by the α process.

  4. The coordination of Mg in foraminiferal calcite

    Branson, Oscar; Redfern, Simon A. T.; Tyliszczak, Tolek; Sadekov, Aleksey; Langer, Gerald; Kimoto, Katsunori; Elderfield, Henry


    The Mg/Ca ratio of foraminiferal calcite is a widely accepted and applied empirical proxy for ocean temperature. The analysis of foraminifera preserved in ocean sediments has been instrumental in developing our understanding of global climate, but the mechanisms behind the proxy are largely unknown. Analogies have been drawn to the inorganic precipitation of calcite, where the endothermic substitution of Mg for Ca is favoured at higher temperatures. However, evidence suggests that foraminiferal Mg incorporation may be more complex: foraminiferal magnesium is highly heterogeneous at the sub-micron scale, and high Mg areas coincide with elevated concentrations of organic molecules, Na, S and other trace elements. Fundamentally, the incorporation mode of Mg in foraminifera is unknown. Here we show that Mg is uniformly substituted for Ca within the calcite mineral lattice. The consistency of Mg-specific X-ray spectra gathered from nano-scale regions across the shell (‘test’) reveals that the coordination of Mg is uniform. The similarity of these spectra to that produced by dolomite shows that Mg is present in an octahedral coordination, ideally substituted for Ca in a calcite crystal structure. This demonstrates that Mg is heterogeneous in concentration, but not in structure. The degree of this uniformity implies the action of a continuous Mg incorporation mechanism, and therefore calcification mechanism, across these compositional bands in foraminifera. This constitutes a fundamental step towards a mechanistic understanding of foraminiferal calcification processes and the incorporation of calcite-bound palaeoenvironment proxies, such as Mg.

  5. Group X

    Fields, Susannah


    This project is currently under contract for research through the Department of Homeland Security until 2011. The group I was responsible for studying has to remain confidential so as not to affect the current project. All dates, reference links and authors, and other distinguishing characteristics of the original group have been removed from this report. All references to the name of this group or the individual splinter groups has been changed to 'Group X'. I have been collecting texts from a variety of sources intended for the use of recruiting and radicalizing members for Group X splinter groups for the purpose of researching the motivation and intent of leaders of those groups and their influence over the likelihood of group radicalization. This work included visiting many Group X websites to find information on splinter group leaders and finding their statements to new and old members. This proved difficult because the splinter groups of Group X are united in beliefs, but differ in public opinion. They are eager to tear each other down, prove their superiority, and yet remain anonymous. After a few weeks of intense searching, a list of eight recruiting texts and eight radicalizing texts from a variety of Group X leaders were compiled.

  6. Ipilimumab 10 mg/kg versus ipilimumab 3 mg/kg in patients with unresectable or metastatic melanoma

    Ascierto, Paolo A; Del Vecchio, Michele; Robert, Caroline


    BACKGROUND: A phase 2 trial suggested increased overall survival and increased incidence of treatment-related grade 3-4 adverse events with ipilimumab 10 mg/kg compared with ipilimumab 3 mg/kg in patients with advanced melanoma. We report a phase 3 trial comparing the benefit-risk profile...... of ipilimumab 10 mg/kg versus 3 mg/kg. METHODS: This randomised, double-blind, multicentre, phase 3 trial was done in 87 centres in 21 countries worldwide. Patients with untreated or previously treated unresectable stage III or IV melanoma, without previous treatment with BRAF inhibitors or immune checkpoint...... for metastatic melanoma, and Eastern Cooperative Oncology Group performance status. The patients, investigators, and site staff were masked to treatment assignment. The primary endpoint was overall survival in the intention-to-treat population and safety was assessed in all patients who received at least one...

  7. Modeling and stabilities of Mg/MgH2 interfaces: A first-principles investigation

    Tang, Jia-Jun; Yang, Xiao-Bao; Chen, Li-Juan; Zhao, Yu-Jun


    We have theoretically investigated the modeling and the structural stabilities of various Mg/MgH2 interfaces, i.e. Mg(10bar 10)/MgH2(210), Mg(0001)/MgH2(101) and Mg(10bar 10)/MgH2(101), and provided illuminating insights into Mg/MgH2 interface. Specifically, the main factors, which impact the interfacial energies, are fully considered, including surface energies of two phases, mutual lattice constants of interface model, and relative position of two phases. The surface energies of Mg and MgH2, on the one hand, are found to be greatly impacting the interfacial energies, reflected by the lowest interfacial energy of Mg(0001)/MgH2(101) which is comprised of two lowest energy surfaces. On the other hand, it is demonstrated that the mutual lattice constants and the relative position of two phases lead to variations of interfacial energies, thus influencing the interface stabilities dramatically. Moreover, the Mg-H bonding at interface is found to be the determinant of Mg/MgH2 interface stability. Lastly, interfacial and strain effects on defect formations are also studied, both of which are highly facilitating the defect formations. Our results provide a detailed insight into Mg/MgH2 interface structures and the corresponding stabilities.

  8. Modeling and stabilities of Mg/MgH2 interfaces: A first-principles investigation

    Jia-Jun Tang


    Full Text Available We have theoretically investigated the modeling and the structural stabilities of various Mg/MgH2 interfaces, i.e. Mg(101¯0/MgH2(210, Mg(0001/MgH2(101 and Mg(101¯0/MgH2(101, and provided illuminating insights into Mg/MgH2 interface. Specifically, the main factors, which impact the interfacial energies, are fully considered, including surface energies of two phases, mutual lattice constants of interface model, and relative position of two phases. The surface energies of Mg and MgH2, on the one hand, are found to be greatly impacting the interfacial energies, reflected by the lowest interfacial energy of Mg(0001/MgH2(101 which is comprised of two lowest energy surfaces. On the other hand, it is demonstrated that the mutual lattice constants and the relative position of two phases lead to variations of interfacial energies, thus influencing the interface stabilities dramatically. Moreover, the Mg-H bonding at interface is found to be the determinant of Mg/MgH2 interface stability. Lastly, interfacial and strain effects on defect formations are also studied, both of which are highly facilitating the defect formations. Our results provide a detailed insight into Mg/MgH2 interface structures and the corresponding stabilities.

  9. Tenoxicam 20 mg or 40 mg after thoracotomy: a prospective, randomized, double-blind, placebo-controlled study.

    Merry, A F; Sidebotham, D A; Middleton, N G; Calder, M V; Webster, C S


    Forty-five adults undergoing thoracotomy were randomized to receive placebo, tenoxicam 20 mg or tenoxicam 40 mg IV during chest wall closure. All patients received intraoperative fentanyl and intercostal blocks followed by morphine by patient-controlled analgesia. Patient numbers 13 to 45 also received thoracic epidural analgesia by continuous infusion of bupivacaine 0.125%, patient numbers 25 to 45 having fentanyl 2 microg/ml added to the epidural infusion. Efficacy parameters and adverse reactions were assessed over the first 24 hours postoperatively. On a 100 mm visual analogue scale, mean (SD) pain at rest (adjusted area under curve for hours 1 to 24) was 25.8 (12.5), 17.4 (14.8) and 16.5 (13.3) mm for groups receiving placebo, 20 mg and 40 mg tenoxicam, respectively (ANOVA: P<0.05). There were no significant differences between study groups postoperatively in pain on coughing, opioid consumption, blood gas measurements, nausea, vomiting, sedation, blood loss, haemoglobin or serum creatinine. One patient in each tenoxicam group reported epigastric pain, rated moderate. These data support the inclusion of tenoxicam 20 mg IV in the management of pain at rest for patients undergoing thoracotomy, but do not show additional benefit for a higher dose.

  10. Corrosion behavior of Mg and Mg-Zn alloys in simulated body fluid

    GAO Jia-cheng; WU Sha; QIAO Li-ying; WANG Yong


    The corrosion behavior of Mg and Mg-Zn in simulated body fluid was studied.The mass loss of pure Mg,Mg-Zn-Zr and Mg-Zn-Zr-Y in simulated body fluid was measured using photovoltaic scale meter.Corrosion rate was determined through electrochemical tests.Finally,the corrosion mechanism was tbermodynamically studied.The results show that the corrosion rate decreases with the lapse of time for both pure Mg and Mg alloys.The purer the alloy,the borer the corrosion resistance exhibits.The corrosion behavior of Mg alloy is improved by the addition of trace Y.

  11. Group morphology

    Roerdink, Jos B.T.M.


    In its original form, mathematical morphology is a theory of binary image transformations which are invariant under the group of Euclidean translations. This paper surveys and extends constructions of morphological operators which are invariant under a more general group TT, such as the motion group

  12. Phase transformations and hydrogen-storage characteristics of Mg-transition metal-oxide alloys

    Song, Myoung Youp; Baek, Sung Hwan; Bobet, Jean-Loius; Park, Hye Ryoung


    Samples with the compositions of 76.5 wt%Mg-23.5 wt%Ni (Mg-Ni), 71.5 wt%Mg-23.5 wt%Ni-5 wt% Fe2O3 (Mg-Ni-Fe2O3) and 71.5 wt%Mg-23.5 wt%Ni-5 wt% Fe2O3 (spray conversion) (Mg-Ni-scFe2O3), 71.5 wt%Mg-23.5 wt%Ni-5 wt% Fe (Mg-Ni-Fe) and 80 wt%Mg-13.33 wt%Ni-6.67 wt%Fe (Mg-13Ni-7Fe) were prepared by reactive mechanical grinding. Mg-13Ni-7Fe has the highest hydriding and dehydriding rates. After hydriding-dehydriding cycling, all the samples contain the Mg2Ni phase. The samples with Fe2O3 and Fe2O3(spray conversion) as starting materials contain the Mg(OH)2 phase after hydriding-dehydriding cycling as well as after reactive mechanical grinding. Mg-Ni-Fe and Mg-13Ni-7Fe contain the MgH2 phase after reactive mechanical grinding. Phases, space groups, cell parameters, contents and crystallite sizes were analyzed by Full Pattern Matching Refinement program, one of the Rietveld analysis programs, from the XRD powder patterns of Mg-Ni-scFe2O3 after reactive mechanical grinding and after hydriding-dehydriding cycling. The MgH2 phase formed in the Mg-Ni-Fe and Mg-13Ni-7Fe mixtures after reactive mechanical grinding is considered to help the pulverization of the materials during reactive mechanical grinding, leading to the high hydriding and dehydriding rates of these mixtures.

  13. Effect of organic ligands on Mg partitioning and Mg isotope fractionation during low-temperature precipitation of calcite

    Mavromatis, Vasileios; Immenhauser, Adrian; Buhl, Dieter; Purgstaller, Bettina; Baldermann, Andre; Dietzel, Martin


    Calcite growth experiments have been performed at 25 oC and 1 bar pCO2 in the presence of aqueous Mg and six organic ligands in the concentration range from 10-5 to 10-3 M. These experiments were performed in order to quantify the effect of distinct organic ligands on the Mg partitioning and Mg stable isotope fractionation during its incorporation in calcite at similar growth rates normalized to total surface area. The organic ligands used in this study comprise of (i) acetate acid, (ii) citrate, (iii) glutamate, (iv) salicylate, (v) glycine and (vi) ethylenediaminetetraacetic acid (EDTA), containing carboxyl- and amino-groups. These fuctional groups are required for bacterial activity and growth as well as related to biotic and abiotic mineralization processes occurring in sedimentary and earliest diagenetic aquatic environments (e.g. soil, cave, lacustrine, marine). The results obtained in this study indicate that the presence of organic ligands promotes an increase in the partition coefficient of Mg in calcite (DMg = (Mg/Ca)calcite (Mg/Ca)fluid). This behaviour can be explained by the temporal formation of aqueous Mg-ligand complexes that are subsequently adsorbed on the calcite surfaces and thereby reducing the active growth sites of calcite. The increase of DMg values as a function of the supersaturation degree of calcite in the fluid phase can be described by the linear equation LogDMg =0.3694 (±0.0329)×SIcalcite - 1.9066 (±0.0147); R2=0.92 In contrast, the presence of organic ligands, with exception of citrate, does not significantly affect the Mg isotope fractionation factor between calcite and reactive fluid (Δ26Mgcalcite-fluid = -2.5 ±0.1). Citrate likely exhibits larger fractionation between the Mg-ligand complexes and free aqueous Mg2+, compared to the other organic ligands studied in this work, as evidenced by the smaller Δ26Mgcalcite-fluid values. These results indicate that in Earth's surface calcite precipitating environments that are

  14. Non-resonant microwave absorption studies of superconducting MgB2 and MgB2 + MgO

    Janhavi P Joshi; Subhasis Sarangi; A K Sood; Dilip Pal; S V Bhat


    Non-resonant microwave absorption (NRMA) studies of superconducting MgB2 and a sample containing ∼ 10% by weight of MgO in MgB2 are reported. The NRMA results indicate near absence of intergranular weak links in the pure MgB2 sample. A linear temperature dependence of the lower critical field c1 is observed indicating a non- wave superconductivity. However, the phase reversal of the NRMA signal which could suggest wave symmetry is also not observed. In the MgB2 + MgO sample, much larger low field dependent absorption is observed indicating the presence of intergranular weak links. The hysteretic behavior of NRMA is compared and contrasted in the two samples. In the pure MgB2 sample, a large hysteresis is observed between the forward and the reverse scans of the magnetic field indicating strong pinning of flux lines. This hysteresis saturates a few degrees below c while in the MgB2 + MgO sample, a much slower increase of hysteresis with decreasing temperature is observed, a signature of weaker pinning.

  15. Group devaluation and group identification

    Leach, C.W.; Rodriguez Mosquera, P.M.; Vliek, M.L.W.; Hirt, E.


    In three studies, we showed that increased in-group identification after (perceived or actual) group devaluation is an assertion of a (preexisting) positive social identity that counters the negative social identity implied in societal devaluation. Two studies with real-world groups used order manip

  16. Weight loss, HbA1c reduction, and tolerability of cetilistat in a randomized, placebo-controlled phase 2 trial in obese diabetics: comparison with orlistat (Xenical).

    Kopelman, Peter; Groot, Gerrit de H; Rissanen, Aila; Rossner, Stephan; Toubro, Soren; Palmer, Richard; Hallam, Rob; Bryson, Andrew; Hickling, Roger I


    The objective of this multicenter, randomized, double-blind study was to determine the efficacy and safety of cetilistat and orlistat relative to placebo in obese patients with type 2 diabetes, on metformin. Following a 2-week run-in, patients were randomized to placebo, cetilistat (40, 80, or 120 mg three times daily), or orlistat 120 mg t.i.d., for 12 weeks. The primary endpoint was absolute change in body weight from baseline. Secondary endpoints included other measures of obesity and glycemic control. Similar reductions in body weight were observed in patients receiving cetilistat 80 or 120 mg t.i.d. or 120 mg t.i.d. orlistat; these reductions were significant vs. placebo (3.85 kg, P = 0.01; 4.32 kg, P = 0.0002; 3.78 kg, P = 0.008). In the 40 mg t.i.d. and placebo groups, reductions were 2.94 kg, P = 0.958 and 2.86 kg, respectively. Statistically significant reductions in glycosylated hemoglobin (HbA(1c)) were noted. Cetilistat was well tolerated, and showed fewer discontinuations due to adverse events (AEs) than in the placebo and orlistat groups. Discontinuation in the orlistat group was significantly worse than in the 120 mg cetilistat and placebo groups and was entirely due to gastrointestinal (GI) AEs. Treatment with cetilistat 80 or 120 mg t.i.d., or with orlistat 120 mg t.i.d., significantly reduced body weight and improved glycemic control relative to placebo in obese diabetic patients. Cetilistat was well tolerated with the number of discontinuations due to AEs being similar to placebo.

  17. The conduction bands of MgO, MgS and HfO2

    Boer, P.K. de; Groot, R.A. de


    Electronic structure calculations for MgO, MgS and HfO2 are reported. It is shown that the conduction bands of MgO and MgS have predominantly anion character, contrary to the common picture of the conduction band being derived from cation states. In transition metal oxides, unoccupied anion states a

  18. TRPM6 forms the Mg2+ influx channel involved in intestinal and renal Mg2+ absorption.

    Voets, T.; Nilius, B.; Hoefs, S.J.G.; Kemp, J.W.C.M. van der; Droogmans, G.; Bindels, R.J.M.; Hoenderop, J.G.J.


    Mg2+ is an essential ion involved in a multitude of physiological and biochemical processes and a major constituent of bone tissue. Mg2+ homeostasis in mammals depends on the equilibrium between intestinal Mg2+ absorption and renal Mg2+ excretion, but little is known about the molecular nature of

  19. Hydrogen storage systems from waste Mg alloys

    Pistidda, C.; Bergemann, N.; Wurr, J.; Rzeszutek, A.; Møller, K. T.; Hansen, B. R. S.; Garroni, S.; Horstmann, C.; Milanese, C.; Girella, A.; Metz, O.; Taube, K.; Jensen, T. R.; Thomas, D.; Liermann, H. P.; Klassen, T.; Dornheim, M.


    The production cost of materials for hydrogen storage is one of the major issues to be addressed in order to consider them suitable for large scale applications. In the last decades several authors reported on the hydrogen sorption properties of Mg and Mg-based systems. In this work magnesium industrial wastes of AZ91 alloy and Mg-10 wt.% Gd alloy are used for the production of hydrogen storage materials. The hydrogen sorption properties of the alloys were investigated by means of volumetric technique, in situ synchrotron radiation powder X-ray diffraction (SR-PXD) and calorimetric methods. The measured reversible hydrogen storage capacity for the alloys AZ91 and Mg-10 wt.% Gd are 4.2 and 5.8 wt.%, respectively. For the Mg-10 wt.% Gd alloy, the hydrogenated product was also successfully used as starting reactant for the synthesis of Mg(NH2)2 and as MgH2 substitute in the Reactive Hydride Composite (RHC) 2LiBH4 + MgH2. The results of this work demonstrate the concrete possibility to use Mg alloy wastes for hydrogen storage purposes.

  20. Coherent interface structures and intergrain Josephson coupling in dense MgO/Mg2Si/MgB2 nanocomposites

    Ueno, Katsuya; Nagashima, Yukihito; Seto, Yusuke; Matsumoto, Megumi; Sakurai, Takahiro; Ohta, Hitoshi; Takahashi, Kazuyuki; Uchino, Takashi


    Many efforts are under way to control the structure of heterointerfaces in nanostructured composite materials for designing functionality and engineering application. However, the fabrication of high-quality heterointerfaces is challenging because the crystal/crystal interface is usually the most defective part of the nanocomposite materials. In this work, we show that fully dense insulator (MgO)/semiconductor(Mg2Si)/superconductor(MgB2) nanocomposites with atomically smooth and continuous interfaces, including epitaxial-like MgO/Mg2Si interfaces, are obtained by solid phase reaction between metallic magnesium and a borosilicate glass. The resulting nanocomposites exhibit a semiconductor-superconducting transition at 36 K owing to the MgB2 nanograins surrounded by the MgO/Mg2Si matrix. This transition is followed by the intergrain phase-lock transition at ˜24 K due to the construction of Josephson-coupled network, eventually leading to a near-zero resistance state at 17 K. The method not only provides a simple process to fabricate dense nanocomposites with high-quality interfaces, but also enables to investigate the electric and magnetic properties of embedded superconducting nanograins with good intergrain coupling.

  1. The Coordination of Mg in Foraminiferal Calcite

    Branson, O.; Redfern, S. A.; Tyliszczak, T.; Sadekov, A.; Langer, G.; Elderfield, H.


    The Mg/Ca ratio in calcite shells ('tests') of foraminifera is an empirical ocean temperature proxy widely used to interpret palaeoclimates. We explore the distribution and local environment of Mg in foram tests using STXM and NEXAFS spectroscopy to test the fundamental assumptions behind the proxy, and shed light on the mechanisms underpinning this vital oceanographic tool. Throughout the development of the Mg/Ca proxy, it has been assumed that Mg in foraminifera tests substitutes directly into the calcite lattice (1). This assumption is based on XRD analyses of various high-Mg biogenic carbonates, where Mg concentrations are manifest in the shifted position of diffraction peaks (2, 3). The extrapolation of this trend to foraminiferal calcite links the proxy to inorganic precipitation experiments, and provides a theoretical mechanistic framework to understand the link between Mg/Ca and temperature: the substitution of Mg is endothermic, and favoured at higher temperatures. However, the concentration of Mg in most foraminifera (0-10 mmol/mol Mg/Ca) is below the detection limit of XRD methods, and the analogy to inorganic systems has not been explicitly tested. Electron microprobe (4-6), LA-ICP-MS (7) and high-resolution nanoSIMS mapping (Sadekov, unpub.) of foraminifera tests have revealed the presence of high 'trace element' bands running in plane with the test surface, enriched in Mg, Sr, S, organic molecules and other trace elements. This emphasises a key question highlighted by Dodd (1) when the proxy was still in its infancy: how is Mg incorporated into mineral skeletons? By direct substitution into the calcite lattice, interstitially in a separate distinct mineral phase, or associated with organic compounds? We address this fundamental question using scanning transmission X-ray microscopy (STXM) and X-ray absorption spectroscopy at ALS beamline 11.0.2 to examine the distribution and local atomic environment of Mg in two contrasting species of foraminifera

  2. Existing form and effect of zirconium in pure Mg, Mg-Yb, and Mg-Zn-Yb alloys

    YU Wenbin; HE Hong; LI Chunmei; LI Qing; LIU Zhiyi; QIN Bing


    The existing form and grain refining effects of small zirconium addition in pure Mg, Mg-Yb and Mg-Zn binary alloys, and Mg-Zn-Yb ternary alloy (ZK60-Yb) were investigated. The results show that Zr element exists mainly in single and cluster particles of pure α-Zr or Zn-Zr compounds inside grains and at grain boundaries. Only the particles located in the interior of grains can act as the nucleus for α-Mg growth and effectively promote the formation of Fine equiaxed grains. The broken and dispersed Zr-rich particles produced during the hot extrusion process can form nebulous banded structure in which these free particles may act as obstacles to dislocation motion in wrought magnesium alloys.

  3. Mg2+-induced vesicles of tetradecyldimethylamine oxide and magnesium dodecyl sulfate.

    Teng, Minmin; Song, Aixin; Hao, Jingcheng


    A Mg2+-induced vesicle phase was prepared from a mixture of tetradecyldimethylamine oxide (C14DMAO) and magnesium dodecyl sulfate [Mg(DS)2] in aqueous solution. Study of the phase behavior shows that at the appropriate mixing ratios, Mg2+-ligand coordination between C14DMAO and Mg(DS)2 results in the formation of molecular bilayers, in which Mg2+ can firmly bind to the head groups of the two surfactants. The area of the head group can be reduced because of the complexation. In this case, no counterions exist in aqueous solution because of the fixation of Mg2+ ions to the bilayer membranes. Therefore, the charges of the bilayer membranes are not shielded by salts. The birefringent solutions of Mg(DS)2 and C14DMAO mixtures consist of vesicles which were determined by transmission electron microscopy (TEM) images and rheological measurements. Magnesium oxide (MgO) nanoplates were obtained via the decomposition of Mg(OH)2 which were synthesized in Mg2+-induced vesicle phase which was used as the microreactor under the existence of ammonia hydroxide. The morphologies and structures of the obtained MgO nanoplates have been characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicate that the crystal growth is along the (111) direction which can be affected by the presence of a vesicle phase having a fixation of Mg2+ ions to the bilayer membranes.

  4. Atomic Structure of Ca40+xMg25Cu35-x Metallic Glasses (Postprint)


    arrangements very similar to the competing Mg2Cu ( Laves phase ) and YCu2 crystals. Simi- lar comparison of coordination polyhedra in the amorphous structure of...hexagonal Laves phase (space group P63/mmc, space group number 194) with lattice parameters a¼ 5.170 Å and c¼ 8.50 Å. This crystal structure contains three...centered (0,0,12,4) Friauf polyhedron containing 12 Mg and 4 Ca atoms in the first shell. Cu2Mg is a cubic Laves phase (space group is Fd-3 m, space group

  5. Algebraic Groups


    The workshop continued a series of Oberwolfach meetings on algebraic groups, started in 1971 by Tonny Springer and Jacques Tits who both attended the present conference. This time, the organizers were Michel Brion, Jens Carsten Jantzen, and Raphaël Rouquier. During the last years, the subject...... of algebraic groups (in a broad sense) has seen important developments in several directions, also related to representation theory and algebraic geometry. The workshop aimed at presenting some of these developments in order to make them accessible to a "general audience" of algebraic group......-theorists, and to stimulate contacts between participants. Each of the first four days was dedicated to one area of research that has recently seen decisive progress: \\begin{itemize} \\item structure and classification of wonderful varieties, \\item finite reductive groups and character sheaves, \\item quantum cohomology...

  6. Group Grammar

    Adams, Karen


    In this article Karen Adams demonstrates how to incorporate group grammar techniques into a classroom activity. In the activity, students practice using the target grammar to do something they naturally enjoy: learning about each other.

  7. Loss of Endothelial Barrier in Marfan Mice (mgR/mgR Results in Severe Inflammation after Adenoviral Gene Therapy.

    Philipp Christian Seppelt

    Full Text Available Marfan syndrome is an autosomal dominant inherited disorder of connective tissue. The vascular complications of Marfan syndrome have the biggest impact on life expectancy. The aorta of Marfan patients reveals degradation of elastin layers caused by increased proteolytic activity of matrix metalloproteinases (MMPs. In this study we performed adenoviral gene transfer of human tissue inhibitor of matrix metalloproteinases-1 (hTIMP-1 in aortic grafts of fibrillin-1 deficient Marfan mice (mgR/mgR in order to reduce elastolysis.We performed heterotopic infrarenal transplantation of the thoracic aorta in female mice (n = 7 per group. Before implantation, mgR/mgR and wild-type aortas (WT, C57BL/6 were transduced ex vivo with an adenoviral vector coding for human TIMP-1 (Ad.hTIMP-1 or β-galactosidase (Ad.β-Gal. As control mgR/mgR and wild-type aortas received no gene therapy. Thirty days after surgery, overexpression of the transgene was assessed by immunohistochemistry (IHC and collagen in situ zymography. Histologic staining was performed to investigate inflammation, the neointimal index (NI, and elastin breaks. Endothelial barrier function of native not virus-exposed aortas was evaluated by perfusion of fluorescent albumin and examinations of virus-exposed tissue were performed by transmission electron microscopy (TEM.IHC and ISZ revealed sufficient expression of the transgene. Severe cellular inflammation and intima hyperplasia were seen only in adenovirus treated mgR/mgR aortas (Ad.β-Gal, Ad.hTIMP-1 NI: 0.23; 0.43, but not in native and Ad.hTIMP-1 treated WT (NI: 0.01; 0.00. Compared to native mgR/mgR and Ad.hTIMP-1 treated WT aorta, the NI is highly significant greater in Ad.hTIMP-1 transduced mgR/mgR aorta (p = 0.001; p = 0.001. As expected, untreated Marfan grafts showed significant more elastolysis compared to WT (p = 0.001. However, elastolysis in Marfan aortas was not reduced by adenoviral overexpression of hTIMP-1 (compared to untreated



    @@ With its headquarters in the historic city of Yangzhou,Jiangsu Muyang Group Co.,Ltd has since its founding in 1967 grown into a well-known group corporation whose activities cover research&development.project design,manufacturing,installation and services in a multitude of industries including feed machinery and engineering,storage engineering,grain machinery and engineering,environmental protection,conveying equipment and automatic control systems.

  9. A comparison of roxatidine acetate 150 mg once daily and 75 mg twice daily in gastric ulcer healing.

    Rösch, W


    In 363 outpatients with endoscopically confirmed gastric ulcers the efficacy and safety of roxatidine acetate 150 mg at night was compared to 75 mg twice daily. After 8 weeks' treatment substantial reductions in gastric ulcer diameter were obtained in addition to healing rates of 83.7 and 86% for the twice daily and night-time dosing, respectively. Daily reductions in day and night-time epigastric pain were obtained with no significant differences between treatment groups for pain scores or antacid tablet consumption. Furthermore, cigarette smoking did not influence the healing rates produced by either treatment schedule. 26 patients reported 32 adverse reactions and 5 patients discontinued treatment because of side effects, although only 1 of these was a severe reaction. The present data suggest that a single night-time dose of roxatidine acetate 150 mg is as safe and effective as the twice daily dose regimen for the management of acute gastric ulceration.

  10. Abelian groups

    Fuchs, László


    Written by one of the subject’s foremost experts, this book focuses on the central developments and modern methods of the advanced theory of abelian groups, while remaining accessible, as an introduction and reference, to the non-specialist. It provides a coherent source for results scattered throughout the research literature with lots of new proofs. The presentation highlights major trends that have radically changed the modern character of the subject, in particular, the use of homological methods in the structure theory of various classes of abelian groups, and the use of advanced set-theoretical methods in the study of undecidability problems. The treatment of the latter trend includes Shelah’s seminal work on the undecidability in ZFC of Whitehead’s Problem; while the treatment of the former trend includes an extensive (but non-exhaustive) study of p-groups, torsion-free groups, mixed groups, and important classes of groups arising from ring theory. To prepare the reader to tackle these topics, th...

  11. UHV and Ambient Pressure XPS: Potentials for Mg, MgO, and Mg(OH)2 Surface Analysis

    Head, Ashley R.; Schnadt, Joachim


    The surface sensitivity of x-ray photoelectron spectroscopy (XPS) has positioned the technique as a routine analysis tool for chemical and electronic structure information. Samples ranging from ideal model systems to industrial materials can be analyzed. Instrumentational developments in the past two decades have popularized ambient pressure XPS, with pressures in the tens of mbar now commonplace. Here, we briefly review the technique, including a discussion of developments that allow data collection at higher pressures. We illustrate the information XPS can provide by using examples from the literature, including MgO studies. We hope to illustrate the possibilities of ambient pressure XPS to Mg, MgO, and Mg(OH)2 systems, both in fundamental and applied studies.

  12. Diffusion of Ca and Mg in Calcite

    Cygan, R.T.; Fisler, D.K.


    The self-diffusion of Ca and the tracer diffusion of Mg in calcite have been experimentally measured using isotopic tracers of {sup 25}Mg and {sup 44}Ca. Natural single crystals of calcite were coated with a thermally-sputtered oxide thin film and then annealed in a CO{sub 2} gas at one atmosphere total pressure and temperatures from 550 to 800 C. Diffusion coefficient values were derived from the depth profiles obtained by ion microprobe analysis. The resultant activation energies for Mg tracer diffusion and Ca self-diffusion are respectively: E{sub a}(Mg) = 284 {+-} 74 kJ/mol and E{sub a}(Ca) = 271 {+-} 80 kJ/mol. For the temperature ranges in these experiments, the diffusion of Mg is faster than Ca. The results are generally consistent in magnitude with divalent cation diffusion rates obtained in previous studies and provide a means of interpreting the thermal histories of carbonate minerals, the mechanism of dolomitization, and other diffusion-controlled processes. The results indicate that cation diffusion in calcite is relatively slow and cations are the rate-limiting diffusing species for the deformation of calcite and carbonate rocks. Application of the calcite-dolomite geothermometer to metamorphic assemblages will be constrained by cation diffusion and cooling rates. The direct measurement of Mg tracer diffusion in calcite indicates that dolomitization is unlikely to be accomplished by Mg diffusion in the solid state but by a recrystallization process.

  13. Solvation of Mg in Helium-4: Are there Meta-stable Mg Dimers ?

    Krotscheck, Eckhard


    Experiments on the formation of magnesium complexes in $^4$He nanodroplets were interpreted as the observation of the formation of weakly bound magnesium complexes. We present results for single Mg and Mg dimer solvation using the hypernetted chain / Euler-Lagrange method as well as path integral Monte Carlo simulations. We find that the phonon-mediated, indirect Mg-Mg interaction adds an oscillatory component to the direct Mg-Mg interaction. We undertake a step-by-step examination of the ingredients of the calculation of the phonon-induced interaction, comparing the results of semi-analytic HNC-EL calculations for bulk and single impurity results with experiments as well as Monte Carlo data. We do not find evidence for a sufficiently strong secondary minimum in the effective Mg-Mg interaction to support a metastable state.

  14. The role of MgO content in ex situ MgB2 wires

    Kovac, P.; Hugek, I.; Meligek, T.;


    An experimental study of the effect of MgO content in the MgB2 powder used for ex situ made composite wires was carried out. Two single-core MgB2/Fe/Cu wires were made using commercial MgB2 powders from Alfa Aesar containing different fraction of MgO. Critical temperature and critical currents...... of as-deformed and heat-treated wires were measured. The differences between the wires are discussed and correlated with the MgO content. It was found that by increasing the amount of MgO, the inter-grain connectivity worsens, but well distributed and low size MgO particles improve flux pinning....

  15. Group Anonymity

    Chertov, Oleg; 10.1007/978-3-642-14058-7_61


    In recent years the amount of digital data in the world has risen immensely. But, the more information exists, the greater is the possibility of its unwanted disclosure. Thus, the data privacy protection has become a pressing problem of the present time. The task of individual privacy-preserving is being thoroughly studied nowadays. At the same time, the problem of statistical disclosure control for collective (or group) data is still open. In this paper we propose an effective and relatively simple (wavelet-based) way to provide group anonymity in collective data. We also provide a real-life example to illustrate the method.

  16. Aging Behavior of Mg-Y-Zr and Mg-Nd-Zr Cast Alloys


    Aging behavior of Mg-3.6Y-0.5Zr and Mg-2.7Nd-0.5Zr alloys was investigated by microhardness measurement and transmission electron microscopy. In the case of Mg-Y-Zr alloy, the presence of β″ phase, a major strengthener, having base centered orthorhombic structure with its lattice constants of aβ″=0.64 nm, bβ″=2.22 nm,and cβ″=0.52 nm was identified. In the case of Mg-Nd-Zr alloy aged at 250℃, the presence ofβ″ and β′phases was identified. The crystal structure ofβ″ phase was found to be DO19 and its orientation relationships with Mg matrix were [0001]β″//[0001]Mg and [01-10]β″//[0110]Mg. The β′ phase had face centered cubicstructure and its orientation relationships with Mg matrix were [011]β′//[0001]Mg and [-11-1]β′//[-2110]Mg.The Mg-2.7Nd-0.5Zr alloy showed higher hardness compared with Mg-3.6Y-0.5Zr alloy.

  17. In vitro and in vivo comparison of binary Mg alloys and pure Mg.

    Myrissa, Anastasia; Agha, Nezha Ahmad; Lu, Yiyi; Martinelli, Elisabeth; Eichler, Johannes; Szakács, Gábor; Kleinhans, Claudia; Willumeit-Römer, Regine; Schäfer, Ute; Weinberg, Annelie-Martina


    Biodegradable materials are under investigation due to their promising properties for biomedical applications as implant material. In the present study, two binary magnesium (Mg) alloys (Mg2Ag and Mg10Gd) and pure Mg (99.99%) were used in order to compare the degradation performance of the materials in in vitro to in vivo conditions. In vitro analysis of cell distribution and viability was performed on discs of pure Mg, Mg2Ag and Mg10Gd. The results verified viable pre-osteoblast cells on all three alloys and no obvious toxic effect within the first two weeks. The degradation rates in in vitro and in vivo conditions (Sprague-Dawley® rats) showed that the degradation rates differ especially in the 1st week of the experiments. While in vitro Mg2Ag displayed the fastest degradation rate, in vivo, Mg10Gd revealed the highest degradation rate. After four weeks of in vitro immersion tests, the degradation rate of Mg2Ag was significantly reduced and approached the values of pure Mg and Mg10Gd. Interestingly, after 4 weeks the estimated in vitro degradation rates approximate in vivo values. Our systematic experiment indicates that a correlation between in vitro and in vivo observations still has some limitations that have to be considered in order to perform representative in vitro experiments that display the in vivo situation.

  18. Informal groups

    E. van den Berg; P. van Houwelingen; J. de Hart


    Original title: Informele groepen Going out running with a group of friends, rather than joining an official sports club. Individuals who decide to take action themselves rather than giving money to good causes. Maintaining contact with others not as a member of an association, but through an Inter

  19. The Mg impurity in nitride alloys

    Zvanut, M. E.; Willoughby, W. R.; Sunay, U. R. [Department of Physics, University of Alabama at Birmingham, Birmingham AL (United States); Koleske, D. D.; Allerman, A. A. [Sandia National Laboratory, Albuquerque NM (United States); Wang, Ke; Araki, Tsutomu [Department of Photonics, Ritsumeikan University, Kusatsu, Shiga (Japan); Nanishi, Yasushi [Department of Photonics, Ritsumeikan University, Kusatsu, Shiga, Japan and WCU Program, Department of Materials Science and Engineering, Seoul National University, Seoul (Korea, Republic of)


    Although several magnetic resonance studies address the Mg acceptor in GaN, there are few reports on Mg doping in the alloys, where hole production depends strongly on the Al or In content. Our electron paramagnetic resonance (EPR) measurements of the p-type alloys suggest that the Mg impurity retains the axial symmetry, characteristic of a p-type dopant in both alloys; however, In and Al produce additional, different characteristics of the acceptor. In InGaN, the behavior is consistent with a lowering of the acceptor level and increasing hole density as In concentration increases. For AlGaN, the amount of neutral Mg decreases with increasing Al content, which is attributed to different kinetics of hydrogen diffusion thought to occur in samples with higher Al mole fraction.

  20. Thermodynamic optimization of Mg-Nd system

    MENG Fan-gui; LIU Hua-shan; LIU Li-bin; JIN Zhan-peng


    Based on the reported experimental data, the phase diagram of Mg-Nd binary system was optimized using the CALPHAD approach. Gibbs energies of the disordered BCC_A2 and ordered BCC_B2 phases were modeled with a single expression based on a 2-sublattice model. Liquid and terminal solutions, such as dHCP and HCP, were modeled as substitutional solutions. Intermediate phases Mg2Nd, Mg3Nd and Mg41Nd5 were treated as stoichiometric compounds. The optimization was carried out in the Thermo-Calc package. A set of thermodynamic parameters is obtained. Calculated phase diagram, enthalpies of formation and Gibbs energies of formation are in reasonable agreement with the experimental data.

  1. The bulk-Moon MgO/FeO ratio: A highlands perspective

    Warren, P. H.


    Compositional data for nonmare (highlands) samples suggest that the Moon's mg ratio (MgO/FeO) is higher than general estimates. Geochemically representative highlands soils have mg ratios of 0.66 (Apollo 16), 0.69 (Luna 20) and 0.73 (ALHA81005). These soils are mixtures of unrelated pristine nonmare rocks, of which there are at least three groups: Mg-rich rocks, ferroan anorthosites, and KREEP. Other than Mg-rich rocks, virtually all pristine rocks have mg 0.65. Thus, assuming the mixing process that sampled Mg-rich materials was random, the average mg of Mg-rich parent magmas was probably at least 0.70. More direct evidence can be derived from the Mg-rich rocks themselves. Nine of them have bulk-rock mg 0.87. Two (15445 A and 67435 PST) contain Fo(92) olivine. Production of melts that crystallized Fo(92) olivine implies that the mg ratios of source regions in lunar mantle were commensurably high. A quantification of this constraint is developed assuming that the parent melts formed by equilibrium (batch) partial melting. Implications of the model are discussed.

  2. Influence of Light Calcining Hydration of Magnesite on MgO Sintering

    LI Huan; YU Jingkun; KUANG Shibo


    Sintered magnesia clinker (also called sintered MgO ) was prepared with Mg(OH)2 (prepared by light calcining hydration of magnesite) and magnesite as starting materials, respectively, by the technical process : light calcining (850 ℃ 1 h )→grinding → molding →firing ( 1 600 ℃ 3 h ). The morphology and struc-ture of light calcined MgO powders prepared with mag-nesite or Mg(OH)2 were analyzed by XRD, SEM and FT-IR. The sinterability and microstructure of sintered magnesia prepared with magnesite or Mg(OH)2 were re-searched. The results showed that: (1) light calcined MgO powders prepared with magnesite or Mg (OH)2 were both face-centered cubic structure. The light cal-cined MgO prepared with magnesitehad the residual of functional group CO32- , and that prepared with Mg (OH)2 didn't have CO32-, and was easy to break, which reduced the grinding time. (2) Because of the high activity of the light calcined MgO prepared with Mg(OH)2 and the catalysis of the water residual in the decomposing process of Mg(OH)2, the apparent porosity of sintered magnesia decreased to 0.6% from 2.0% of before hydration, closed porosity decreased to 2.8% from 6.1%, and bulk density increased to 3.46 g·cm-3 from 3.29 g·cm-3

  3. MgH{sub 2} as dopant for improved activation of commercial Mg ingot

    Jain, P., E-mail: [Hydrogen Research Institute, Université du Québec à Trois-Rivières, 3351 des Forges, Trois-Rivières, Québec G9A 5H7 (Canada); Lang, J. [Hydrogen Research Institute, Université du Québec à Trois-Rivières, 3351 des Forges, Trois-Rivières, Québec G9A 5H7 (Canada); Skryabina, N.Y. [Department of Physics, Perm State University, 15, Bukireva, 614990 Perm (Russian Federation); Fruchart, D. [Institut Néel, BP 166, 38042 Grenoble Cedex 9 (France); Santos, S.F [CECS, Federal University of ABC, Rua Santa Adélia 166, Santo André, SP 09210-170 (Brazil); Binder, K.; Klassen, T. [Institute of Materials Technology, Helmut-Schmidt-University, University of the Federal Armed Forces, Holstenhofweg 85, 22043 Hamburg (Germany); Huot, J., E-mail: [Hydrogen Research Institute, Université du Québec à Trois-Rivières, 3351 des Forges, Trois-Rivières, Québec G9A 5H7 (Canada)


    Highlights: •We propose a simple method to reduce production cost of light weight materials for hydrogen storage applications. •Cheaper Mg ingot rather than expensive MgH{sub 2} is used as starting material. •Effect of MgH{sub 2} as catalytic powder for improved activation behavior of Mg is demonstrated. -- Abstract: In this paper, we propose a method to decrease the activation time (first hydrogenation) of commercial Mg. This new alternative processing route uses a combination of cold rolling and short time ball milling to obtain full hydrogen capacity quickly in the first hydrogenation. As ball milling of ductile materials leads to particle agglomeration, brittle Mg plates produced by repetitive cold rolling were used as starting material. These rolled plates were then ball milled for 30 min with and without the addition of 5 wt% Mg or MgH{sub 2} powders. All the synthesized samples were investigated for hydrogen storage, absorption–desorption behavior and microstructure using X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and pressure-composition temperature (PCT) methods. Results showed slow activation behavior for cold rolled Mg plates, which was slightly improved after milling. Further improvement was obtained by adding 5 wt% of Mg powder during ball milling. In contrast, when the plates were ball milled with 5 wt% of MgH{sub 2} powder a drastic improvement in activation behavior was observed with hydrogen capacity reaching up to 6.2 wt% in comparison to 2.74 wt% for undoped and 3.57 wt% for Mg doped samples. These results reveal that ball milling with ductile Mg powder deforms only the surface of Mg plates while brittle MgH{sub 2} powders causes fracturing and cracks, increasing the surface area and generating heterogeneous nucleation sites within the bulk material.

  4. The influence of Mg-Zr master alloy microstructure on the corrosion of Mg

    Gandel, D. S.; Easton, M. A.; Gibson, M. A.; Abbott, T.; Birbilis, N.

    In this study, sixteen Mg-Zr alloys were produced to investigate the role of Zr on corrosion of Mg. Alloys were produced using two different commercial Mg-Zr master alloys commonly used for grain refining Mg, but which contain different Zr particle size distributions. It is seen that the master alloy with a smaller Zr particle size leads to an alloy containing more Zr in solid solution. The ratio of Zr in solid solution and in particle form was observed to have a marked effect on the corrosion of Mg.

  5. Features of Mg2Si Layer Growth in Si/Mg2Si Multilayers

    L.E. Konotopskyi


    Full Text Available Features of magnesium siliced layer growth in Si/Mg2Si multilayers in initial state and after thermal annealing were studied by methods of transmission electron microscopy and X-Ray scattering. As-deposited magnesium silicide layers are amorphous with nanocrystal inclusions of metastable h-Mg2Si. Formation of Mg2Si in hexagonal modification occurs under the influence of stress produced by silicon layers. At T = 723 К Mg2Si layers finished crystallizes in hexagonal modification, with some coarsening of grains. That is accompanied with 7.3 % reduction in period of the Si/Mg2Si multilayer.

  6. Influence of Mg Content on Deformability of AlMg Alloys during Extrusion

    Leśniak D.


    Full Text Available In this study the research on deformability of AlMg alloys with high Mg contents in extrusion was carried out. The different shapes from AlMg alloys containing 3.5%, 4.5% and 5.5% of Mg were extruded on 500 T semi-industrial press by using one-hole and multi-hole flat dies. The extrudates surface quality was under investigations in relation with the temperature-speed parameters of the extrusion process. The metal exit speed was estimated depending on the extrudates shape, wall thickness and Mg content. The alloy’s border solidus and liquidus temperatures were also determined.


    L. Taylor


    The CMS Communications Group, established at the start of 2010, has been busy in all three areas of its responsibility: (1) Communications Infrastructure, (2) Information Systems, and (3) Outreach and Education. Communications Infrastructure There are now 55 CMS Centres worldwide that are well used by physicists working on remote CMS shifts, Computing operations, data quality monitoring, data analysis and outreach. The CMS Centre@CERN in Meyrin, is the centre of the CMS offline and computing operations, hosting dedicated analysis efforts such as during the CMS Heavy Ion lead-lead running. With a majority of CMS sub-detectors now operating in a “shifterless” mode, many monitoring operations are now routinely performed from there, rather than in the main Control Room at P5. The CMS Communications Group, CERN IT and the EVO team are providing excellent videoconferencing support for the rapidly-increasing number of CMS meetings. In parallel, CERN IT and ...

  8. Lego Group

    Møller Larsen, Marcus; Pedersen, Torben; Slepniov, Dmitrij


    The last years’ rather adventurous journey from 2004 to 2009 had taught the fifth-largest toy-maker in the world - the LEGO Group - the importance of managing the global supply chain effectively. In order to survive the largest internal financial crisis in its roughly 70 years of existence......, the management had, among many initiatives, decided to offshore and outsource a major chunk of its production to Flextronics. In this pursuit of rapid cost-cutting sourcing advantages, the LEGO Group planned to license out as much as 80 per cent of its production besides closing down major parts...... of the production in high cost countries. Confident with the prospects of the new partnership, the company signed a long-term contract with Flextronics. This decision eventually proved itself to have been too hasty, however. Merely three years after the contracts were signed, LEGO management announced that it would...

  9. Group play

    Tychsen, Anders; Hitchens, Michael; Brolund, Thea


    of group dynamics, the influence of the fictional game characters and the comparative play experience between the two formats. The results indicate that group dynamics and the relationship between the players and their digital characters, are integral to the quality of the gaming experience in multiplayer......Role-playing games (RPGs) are a well-known game form, existing in a number of formats, including tabletop, live action, and various digital forms. Despite their popularity, empirical studies of these games are relatively rare. In particular there have been few examinations of the effects...... of the various formats used by RPGs on the gaming experience. This article presents the results of an empirical study, examining how multi-player tabletop RPGs are affected as they are ported to the digital medium. Issues examined include the use of disposition assessments to predict play experience, the effect...

  10. On submodule characterization and decomposition of modules over group rings

    Uc, Mehmet; Alkan, Mustafa


    In this paper, for a commutative unity ring R and a finite group G, we characterize some submodule properties of RG- module MG introduced in [8]. Our aim is to decompose MG into RG-submodules by defining an idempotent in EndRG MG and to verify the relation between the quotient of group module and the quotient of related module.

  11. Elevated temperature properties of Mg- 12Li-Al-MgO composites

    WEI Xiao-wei; HUANG Qing-min


    The compressive creep of Mg-12Li-Al-MgO particulate composites was investigated, which were produced by the reaction of reinforcement materials (B2O3) with Mg-12Li-Al alloy melt in the temperature range of 100-190 ℃ and under different compressive stress in the range of 40-70 MPa with special apparatus. The content of MgO particulates is about 0, 5%, 10%,15%(volume fraction) in Mg-12Li-Al alloy respectively. The results reveal that the creep resistance of the particulate composites is increased with increasing the content of MgO particulates and considerable improvementin creep resistance is observed in Mg-12Li-Al-MgO composites. However, over all range of temperatures and stresses, the creep data for these composites can be correlated using an empirical equation εs =Aσnexp(-Q/RT), where n is 4.93 and Q is about 78.1 kJ/mol for Mg-14Li-Al alloy and n is between 7.48 and 9.47 and Q is 111.2-137.3 kJ/mol for Mg-12Li-Al-MgO composites. The different compressive creep behavior of the composites is associated with the different material constant A. The compressive creep rate is controlled by the lattice diffusion of Li and dislocation climb.

  12. Ultrafast Synthesis and Related Phase Evolution of Mg2Si and Mg2Sn Compounds

    Zhang, Qiang; Lu, Qiangbing; Yan, Yonggao; Su, Xianli; Tang, Xinfeng


    Both Mg2Si and Mg2Sn compounds were synthesized by an ultra-fast self-propagating high-temperature synthesis (SHS) method. The data regarding SHS were obtained via theoretical calculation combined with experiments, showing that the adiabatic temperature T ad and ignition temperature T ig of Mg2Si are a little higher than those of Mg2Sn. The mechanism of phase evolution and the concomitant microstructure evolution during the synthesis process of Mg2Si and Mg2Sn compounds were investigated by adopting SHS technique coupled with a sudden quenching treatment. Differential scanning calorimetry (DSC), field emission scanning electron microscopy (FESEM), and x-ray powder diffraction (XRD) results indicate that Mg2Si compound can be directly synthesized through the reaction of Mg and Si elements at around 850 K. Correspondingly, the formation of Mg2Sn needs to undergo melting of Sn and the subsequent feeble reaction between Mg and Sn elements before the large scale transformation at 730 K. As the groundwork, this research embodies great significance for future study on the ultrafast SHS process of the ternary Mg2Si1-x Sn x solid solutions.

  13. Formation and Corrosion Resistance of Mg-Al Hydrotalcite Film on Mg-Gd-Zn Alloy

    Ba, Z. X.; Dong, Q. S.; Kong, S. X.; Zhang, X. B.; Xue, Y. J.; Chen, Y. J.


    An environment-friendly technique for depositing a Mg-Al hydrotalcite (HT) (Mg6Al2(OH)16-CO3ṡ4H2O) conversion film was developed to protect the Mg-Gd-Zn alloy from corrosion. The morphology and chemical compositions of the film were analyzed by scanning electronic microscope (SEM) equipped with energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and Raman spectroscopy (RS), respectively. The electrochemical test and hydrogen evolution test were employed to evaluate the biocorrosion behavior of Mg-Gd-Zn alloy coated with the Mg-Al HT film in the simulated body fluid (SBF). It was found that the formation of Mg-Al HT film was a transition from amorphous precursor to a crystalline HT structure. The HT film can effectively improve the corrosion resistance of magnesium alloy. It indicates that the process provides a promising approach to modify Mg-Gd-Zn alloy.

  14. Group Connections: Whole Group Teaching.

    Griffiths, Dorothy


    A learner-centered approach to adult group instruction involved learners in investigating 20th-century events. The approach allowed learners to concentrate on different activities according to their abilities and gave them opportunities to develop basic skills and practice teamwork. (SK)

  15. Melting relations in the MgO-MgSiO3 system up to 70 GPa

    Ohnishi, Satoka; Kuwayama, Yasuhiro; Inoue, Toru


    Melting experiments in a binary system MgO-MgSiO3 were performed up to 70 GPa using a CO2 laser heated diamond anvil cell. The quenched samples were polished and analyzed by a dualbeam focused ion beam (FIB) and a field emission scanning electron microscope (FE-SEM), respectively. The liquidus phase and the eutectic composition were determined on the basis of textual and chemical analyses of sample cross sections. Our experimental results show that the eutectic composition is the Si/Mg molar ratio of 0.76 at 35 GPa and it decreases with increasing pressure. Above 45 GPa, it becomes relatively constant at about 0.64-0.65 Si/Mg molar ratio. Using our experimental data collected at a wide pressure range up to 70 GPa together with previous experimental data, we have constructed a thermodynamic model of the eutectic composition of the MgO-MgSiO3 system. The eutectic composition extrapolated to the pressure and temperature conditions at the base of the mantle is about 0.64 Si/Mg molar ratio. The modeled eutectic composition is quite consistent with a previous prediction from ab initio calculations (de Koker et al. in Earth Planet Sci Lett 361:58-63, 2013), suggesting that the simple assumption of a non-ideal regular solution model can well describe the melting relation of the MgO-MgSiO3 system at high pressure. Our results show that the liquidus phase changes from MgO-periclase to MgSiO3-bridgmanite at 35 GPa for the simplified pyrolite composition ( 0.7 Si/Mg molar ratio), while MgSiO3-bridgmanite is the liquidus phase at the entire lower mantle conditions for the chondritic composition ( 0.84 Si/Mg molar ratio).

  16. Hydrogen in La2MgNi9D13: the role of magnesium.

    Denys, Roman V; Yartys, Volodymyr A; Webb, Colin J


    Reversible hydrogen storage capacity of the La(3-x)Mg(x)Ni(9) alloys, charged by gaseous hydrogen or by electrochemical methods, reaches its maximum at composition La(2)MgNi(9). As (La,Mg)Ni(3-3.5) alloys are the materials used in advanced metal hydride electrodes in Ni-MH batteries, this raises interest in the study of the structure-properties interrelation in the system La(2)MgNi(9)-H(2) (D(2)). In the present work, this system has been investigated by use of in situ synchrotron X-ray and neutron powder diffraction in H(2)/D(2) gas and by performing pressure-composition-temperature measurements. The saturated La(2)MgNi(9)D(13.1) hydride forms via an isotropic expansion and crystallizes with a trigonal unit cell (space group R3m (No.166); a = 5.4151(1) Å; c = 26.584(2) Å; V = 675.10(6) Å(3)). The studied hybrid structure is composed of a stacking of two layers resembling existing intermetallic compounds LaNi(5) (CaCu(5) type) and LaMgNi(4) (Laves type). These are occupied by D to form LaNi(5)D(5.2) and LaMgNi(4)D(7.9). The LaNi(5)D(5.2) slab has a typical structure observed for all reported LaNi(5)-containing hybrid structures of the AB(5) + Laves phase types. However, the Laves type slab LaMgNi(4)D(7.9) is different from the characterized individual LaMgNi(4)D(4.85) hydride. This results from the filling of a greater variety of interstitial sites in the La(2)MgNi(9)D(13)/LaMgNi(4)D(7.9), including MgNi(2), Ni(4), (La/Mg)(2)Ni(2), and (La/Mg)Ni(3), in contrast with individual LaMgNi(4)D(4.85) where only La(2)MgNi(2) and Ni(4) interstitials are occupied. Despite a random distribution of La and Mg in the structure, a local hydrogen ordering takes place with H atoms favoring occupation of two Mg-surrounded sites, triangles MgNi(2) and tetrahedra LaMgNi(2). A directional bonding between Ni, Mg, and hydrogen is observed and is manifested by a formation of the NiH(4) tetrahedra and MgH(6) octahedra, which are connected to each other by sharing H vertexes to form a

  17. Construct and concurrent validation of the MG-QOL15 in the practice setting.

    Burns, Ted M; Grouse, C K; Conaway, Mark R; Sanders, Donald B


    Health-related quality of life (HRQOL) estimates can play an important role in patient care by providing information about the patient's perception of impairment and disability and the degree to which the patient tolerates disease manifestations. The 15-item myasthenia gravis quality of life scale (MG-QOL15) is an HRQOL evaluative instrument specific to patients with myasthenia gravis (MG) that was designed to be easy to administer and interpret. In this multicenter study we demonstrate the construct validity of the MG-QOL15 in the practice setting. To assess the construct validity, score distributions were examined for test items in different MG patient groups that represent the clinical spectrum of the disease. For example, patients in remission more frequently scored test items as normal than did patients in other groups. Patients with lower (better) MG composite scores also more frequently scored items as normal than did patients with higher (worse) scores. There was also appropriate correlation between the MG-QOL15 and the other MG-specific scales studied. The study findings shed light on what troubles MG patients. The MG-QOL15 has construct validity in the clinical practice setting and represents an efficient and valuable tool for assessing HRQOL for patients with MG.

  18. Crystal structure of the CorA Mg2+ transporter.

    Lunin, Vladimir V; Dobrovetsky, Elena; Khutoreskaya, Galina; Zhang, Rongguang; Joachimiak, Andrzej; Doyle, Declan A; Bochkarev, Alexey; Maguire, Michael E; Edwards, Aled M; Koth, Christopher M


    The magnesium ion, Mg2+, is essential for myriad biochemical processes and remains the only major biological ion whose transport mechanisms remain unknown. The CorA family of magnesium transporters is the primary Mg2+ uptake system of most prokaryotes and a functional homologue of the eukaryotic mitochondrial magnesium transporter. Here we determine crystal structures of the full-length Thermotoga maritima CorA in an apparent closed state and its isolated cytoplasmic domain at 3.9 A and 1.85 A resolution, respectively. The transporter is a funnel-shaped homopentamer with two transmembrane helices per monomer. The channel is formed by an inner group of five helices and putatively gated by bulky hydrophobic residues. The large cytoplasmic domain forms a funnel whose wide mouth points into the cell and whose walls are formed by five long helices that are extensions of the transmembrane helices. The cytoplasmic neck of the pore is surrounded, on the outside of the funnel, by a ring of highly conserved positively charged residues. Two negatively charged helices in the cytoplasmic domain extend back towards the membrane on the outside of the funnel and abut the ring of positive charge. An apparent Mg2+ ion was bound between monomers at a conserved site in the cytoplasmic domain, suggesting a mechanism to link gating of the pore to the intracellular concentration of Mg2+.

  19. Atazanavir increases the plasma concentrations of 1200 mg raltegravir dose.

    Krishna, Rajesh; East, Lilly; Larson, Patrick; Valiathan, Chandni; Deschamps, Kathleen; Luk, Julie Ann; Bethel-Brown, Crystal; Manthos, Helen; Brejda, John; Gartner, Michael


    Raltegravir is a human immunodeficiency virus (HIV)-1 integrase strand transfer inhibitor currently marketed at a dose of 400 mg twice-daily (b.i.d.). Raltegravir 1200 mg once-daily (q.d.) (investigational q.d. formulation of 2 × 600 mg tablets; q.d. RAL) was found to be generally well tolerated and non-inferior to the marketed 400 mg b.i.d. dose at 48 weeks in a phase 3 trial. Since raltegravir is eliminated mainly by metabolism via a uridine diphosphate glucuronosyltransferase (UGT) 1A1-mediated glucuronidation pathway, co-administration of UGT1A1 inhibitors may increase the plasma levels of q.d. RAL. To assess this potential, the drug interaction of 1200 mg raltegravir using atazanavir, a known UGT1A1 inhibitor, was studied. An open-label, randomized, 2-period, fixed-sequence phase 1 study was performed in adult healthy male and female (non-childbearing potential) subjects ≥ 19 and ≤ 55 years of age, with a body mass index (BMI) ≥ 18.5 and ≤ 32.0 kg/m(2) . Subjects (n = 14) received a single oral dose of 1200 mg raltegravir in period 1. After a washout period of at least 7 days, the subjects received oral doses of 400 mg atazanavir q.d. for 9 consecutive days, with a single oral dose of 1200 mg raltegravir co-administered on day 7 of period 2. Serial blood samples were collected for 72 h following raltegravir dosing and analysed using a validated bioanalytical method to quantify raltegravir plasma concentrations. Co-administration with atazanavir yielded GMRs (90% CIs) for raltegravir AUC0-∞ , Cmax and C24 of 1.67 (1.34, 2.10), 1.16 (1.01, 1.33) and 1.26 (1.08, 1.46), respectively. There was no effect of raltegravir on serum total bilirubin. In contrast, atazanavir increased the mean bilirubin by up to 200%, an effect that was preserved in the atazanavir/raltegravir treatment group. Administration of single q.d. RAL alone and co-administered with multiple oral doses of atazanavir were generally well tolerated in healthy subjects. The results show that

  20. Forty-eight weeks treatment with clevudine 30 mg qd versus lamivudine 100 mg qd for chronic hepatitis B infection: a double-blind randomized study.

    Lau, George K K; Leung, Nancy


    Clevudine is a pyrimidine analogue with potent activity against hepatitis B virus (HBV) replication in vitro. In a previous pivotal phase III clinical study, 24 weeks treatment with clevudine 30 mg has been shown to profoundly suppress HBV replication and normalize serum alanine aminotransferase level. In this study, we compare the efficacy and safety of clevudine (30 mg daily) versus lamivudine (100 mg daily) for 48 weeks in treatment-naive chronic hepatitis B e antigen (HBeAg) positive patients. Ninety-two chronic HBeAg positive patients were randomized to receive clevudine 30 mg daily or lamivudine 100 mg daily in a 1:1 ratio. The clevudine group demonstrated greater viral suppression at week 48 when compared with the lamivudine group (median reduction: 4.27 vs. 3.17 log(10) copies/ml at week 48, pviral rebound during lamivudine therapy but no resistance was found in the clevudine group during 48-week treatment period. A 48-week dosing with clevudine 30 mg daily was superior to lamivudine 100 mg daily in suppressing HBV replication, with no emergence of viral breakthrough in patients with HBeAg positive chronic hepatits B.

  1. Perbandingan Gabapentin 600 mg dengan 1.200 mg per Oral Preoperatif terhadap Nilai Visual Analogue Scale dan Pengurangan Kebutuhan Petidin Pascaoperasi pada Modifikasi Mastektomi Radikal

    Ardi Zulfariansyah


    Full Text Available Gabapentin is a GABA analog which has the effect of anti hyperalgesia, anti allodynia, and anti nociceptive. This research was conducted in order to assess the effect of 600mg and 1,200 mg gabapentin given preoperatively to assess visual analogue scale (VAS score and reduction of pethidine requirement. The study was done by conducting a double blind randomized controlled trial on 38 patients, aged 18–65 years, with ASA physical status I–II. Patients were divided into two groups: 600 mg gabapentin and 1,200 mg gabapentin group. The quality of pain was assessed using VAS score. The results were statistically analyzed using Mann-Whitney Test with 95% confidence interval and considered significant if p value <0.05. From the results, the VAS values obtained at rest and during mobilization were significantly different (p<0.05. The 1,200 mg gabapentin group received less additional pethidine (10.5% vs 15.8%, although no significant difference was shown (p=0.631. The conclusion of this study is that administration of 1,200 mg gabapentin per oral pre operatively is better when compared to 600 mg in reducing post operative visual analog scale score in modified radical mastectomy. However, it do not reduce the need for analgesic significantly.


    Pratibha Rai


    Full Text Available BACKGROUND Mifepristone is Selective Progesterone Receptor Modulators (SPRMS and is emerging as a best medical treatment increasing the quality of life as well as saving the patient from surgery. This drug has shown great effectiveness, e.g.: 2.5 mg, 5 mg and 10 mg, but with less reduction in uterine volume as well as reduction in fibroids size. Ref. 1 Yang Y et al. AIM The aim of this study was to evaluate the safety and improvement of life pattern using 10 mg and 25 mg daily doses of Mifepristone for six months with a nine month follow-up period for the regress of fibroids as well as uterine volume to improve quality of life without any surgery in premenopausal women with complaint of menorrhagia, dysmenorrhoea, abdominal discomfort, dyspareunia, rectal pain, urinary problem and weakness due to anaemia. DESIGN The research was a randomized double blind clinical study undertaken at Patliputra Medical College Hospital, Dhanbad (Jharkhand. SEARCH METHOD I had searched a number of international journals, reference lists, databases and ongoing trails and the internet. Also searched the specialised register of Cochrane menstrual disorders and subfertility (Cochrane menstrual disorder and subfertility. The Cochrane central register of control trails (Central. The Cochrane library 2011, Issue 4. METHODOLOGY The trial was done on 100 patients. Patients were divided into two equal groups (All were with symptomatic uterine fibroids to evaluate safety as well as quality of life. Dose decided was 10 mg (A and 25 mg (B of Mifepristone. Subjects were taken from Gynaecological outdoor of Patliputra Medical College Hospital, Dhanbad, (Jharkhand, after taking their consent. All women were between the age group of 35 to 48 years with symptomatic multiple fibroids of various sizes and site. At enrolment patients of both groups underwent clinical assessment, Per Abdomen (P/A and Per Vaginal (P/V examination, USG for uterine volume and size of fibroid. Endometrial

  3. Safety and tolerability of donepezil 23 mg in moderate to severe Alzheimer's disease

    Zou Heng


    Full Text Available Abstract Background Donepezil 23 mg/d, recently approved in the United States for treatment of moderate to severe Alzheimer's disease (AD, was developed to address the need for an additional treatment option for patients with advanced AD. This report, based on a pivotal phase 3 study, presents a detailed analysis of the safety and tolerability of increasing donepezil to 23 mg/d compared with continuing 10 mg/d. Method Safety analyses comprised examination of the incidence, severity, and timing of treatment-emergent adverse events (AEs and their relationship to treatment initiation; changes in weight, electrocardiogram, vital signs, and laboratory parameters; and the incidence of premature study discontinuation. The analysis population (n = 1434 included all randomized patients who took at least 1 dose of study drug and had a postbaseline safety assessment. To further examine the effect of transition from a lower to a higher donepezil dose, a pooled analysis of safety data from 2 phase 3 trials of donepezil 5 mg/d and 10 mg/d was also performed. Results The safety population comprised 1434 patients: donepezil 23 mg/d (n = 963; donepezil 10 mg/d (n = 471; completion rates were 71.1% and 84.7%, respectively. The most common AEs were nausea, vomiting, and diarrhea (donepezil 23 mg/d: 11.8%, 9.2%, 8.3%; donepezil 10 mg/d: 3.4%, 2.5%, 5.3%, respectively. AEs that contributed most to early discontinuations were vomiting (2.9% of patients in the 23 mg/d group and 0.4% in the 10 mg/d group, nausea (1.9% and 0.4%, diarrhea (1.7% and 0.4%, and dizziness (1.1% and 0.0%. The percentages of patients with AEs in the 23 mg/d group, as well as the timing, type, and severity of these AEs, were similar to those seen in previous donepezil trials with titration from 5 to 10 mg/d. Serious AEs were uncommon (23 mg/d, 8.3%; 10 mg/d, 9.6%. Discussion The 23 mg/d dose of donepezil was associated with typical cholinergic AEs, particularly gastrointestinal-related AEs

  4. Hydrodechlorination of Tetrachloromethane over Palladium Catalysts Supported on Mixed MgF₂-MgO Carriers.

    Bonarowska, Magdalena; Wojciechowska, Maria; Zieliński, Maciej; Kiderys, Angelika; Zieliński, Michał; Winiarek, Piotr; Karpiński, Zbigniew


    Pd/MgO, Pd/MgF₂ and Pd/MgO-MgF₂ catalysts were investigated in the reaction of CCl₄ hydrodechlorination. All the catalysts deactivated in time on stream, but the degree of deactivation varied from catalyst to catalyst. The MgF₂-supported palladium with relatively large metal particles appeared the best catalyst, characterized by good activity and selectivity to C₂-C₅ hydrocarbons. Investigation of post-reaction catalyst samples allowed to find several details associated with the working state of hydrodechlorination catalysts. The role of support acidity was quite complex. On the one hand, a definite, although not very high Lewis acidity of MgF₂ is beneficial for shaping high activity of palladium catalysts. The MgO-MgF₂ support characterized by stronger Lewis acidity than MgF₂ contributes to very good catalytic activity for a relatively long reaction period (~5 h) but subsequent neutralization of stronger acid centers (by coking) eliminates them from the catalyst. On the other hand, the role of acidity evolution, which takes place when basic supports (like MgO) are chlorided during HdCl reactions, is difficult to assess because different events associated with distribution of chlorided support species, leading to partial or even full blocking of the surface of palladium, which plays the role of active component in HdCl reactions.

  5. A single-blind, randomized comparison of olanzapine at a starting dose of 5 mg versus 20 mg in acute schizophrenia.

    Mauri, Massimo Carlo; Colasanti, Alessandro; Rossattini, Matteo; Moliterno, Donatella; Baldi, Marialuisa L; Papa, Pietro


    Acute psychotic episodes represent critical situations during the course of schizophrenia. Olanzapine (OLZ), a second-generation antipsychotic, is efficacious in acute settings at dosages of 5 to 20 mg/d, and it can be considered a first-line treatment for patients with an acute episode of schizophrenia. The aim of this study was to evaluate the efficacy and tolerability of OLZ at a starting dose of 5 mg versus 20 mg in acute schizophrenic patients and to compare titration versus nontitration.Fifty-one schizophrenic inpatients were randomly assigned to receive OLZ at 5 mg/d (26 patients, group 1) or 20 mg/d (25 patients, group 2) as a starting dosage during an exacerbation phase. In group 1, the OLZ dosage was increased to a mean dosage of 10.55 (+/- 4.00) mg/d. Group 2 received OLZ at a fixed dose of 20 mg throughout the hospitalization period. Olanzapine was significantly and clinically effective on Brief Psychiatric Rating Scale (BPRS), Positive and Negative Syndrome Scale, PANSS positive symptoms, and Hamilton Rating Scale for Depression in both groups. There were no significant differences between groups 1 and 2 in the percent improvement in BPRS, Positive and Negative Syndrome Scale, PANSS positive symptoms, PANSS negative symptoms, or Hamilton Rating Scale for Depression; but group 2 was significantly superior in the mean percent improvement in the BPRS items of anxiety (P < 0.001) and suspiciousness (P < 0.05). In conclusion, the higher doses evidence more efficacy on anxiety and suspiciousness, so it seems to be useful to begin therapy with a full dose of the drug to obtain the maximum effect without any significant side effects.


    L. Taylor


    The CMS Communications Group has been busy in all three areas of its responsibility: (1) Communications Infrastructure, (2) Information Systems, and (3) Outreach and Education. Communications Infrastructure The 55 CMS Centres worldwide are well used by physicists working on remote CMS shifts, Computing operations, data quality monitoring, data analysis and outreach. The CMS Centre@CERN in Meyrin, is the centre of the CMS Offline and Computing operations, and a number of subdetector shifts can now take place there, rather than in the main Control Room at P5. A new CMS meeting room has been equipped for videoconferencing in building 42, next to building 40. Our building 28 meeting room and the facilities at P5 will be refurbished soon and plans are underway to steadily upgrade the ageing equipment in all 15 CMS meeting rooms at CERN. The CMS evaluation of the Vidyo tool indicates that it is not yet ready to be considered as a potential replacement for EVO. The Communications Group provides the CMS-TV (web) cha...


    L. Taylor


    The CMS Communications Group, established at the start of 2010, has been strengthening the activities in all three areas of its responsibility: (1) Communications Infrastructure, (2) Information Systems, and (3) Outreach and Education. Communications Infrastructure The Communications Group has invested a lot of effort to support the operations needs of CMS. Hence, the CMS Centres where physicists work on remote CMS shifts, Data Quality Monitoring, and Data Analysis are running very smoothly. There are now 55 CMS Centres worldwide, up from just 16 at the start of CMS data-taking. The latest to join are Imperial College London, the University of Iowa, and the Università di Napoli. The CMS Centre@CERN in Meyrin, which is now full repaired after the major flooding at the beginning of the year, has been at the centre of CMS offline and computing operations, most recently hosting a large fraction of the CMS Heavy Ion community during the lead-lead run. A number of sub-detector shifts can now take pla...

  8. Preparation of Metallic Isotope 26Mg

    WuXiaolei; ZhangFuming; GanZaiguo; GuoJunsheng; QinZhi


    Some special isotope material is usually used in nuclear experiments. It can be served as ion beam or target. When new superheavy nuclide 265Bh (Z=107) is synthesized, a reaction of 243Am target with 26Mg ion beamis selected to produce new isotope 265Bh. The preparation and production of this rare and extremely expensive isotope 26 Mg used for ion beam substance will be a key problem in synthesizing experiment of 265Bh. Theavailable chemical form of isotope 26Mg in commercial product usually is oxide or other compound, which are not required in our experiment. They need to be transformed to metal form as a proper working substance in ion source.

  9. Hydrogenation properties of Mg-Al alloys

    Andreasen, Anders


    In this paper the properties of Mg-Al alloys in relation to hydrogen storage are reviewed. The main topics of this paper are materials preparation, hydrogen capacity, thermodynamics of hydride formation, and the kinetics of hydride formation and decomposition. Hydrogenation of Mg-Al leads...... to disproportionation with the formation of magnesium hydride and metallic aluminum as the final product. Experimental evidence renders this process reversible. It is observed that the enthalpy of hydride formation of magnesium is lowered upon alloying with Al due to a slightly endothermic disproportionation reaction....... Further, it is found that the kinetics of hydrogenation, as well dehydrogenation, may be significantly improved by alloying compared to pure Mg. The expense of these improvements of the hydrogenation/dehydrogenation properties is a lower gravimetric hydrogen density in the hydrogenated product, (C) 2008...

  10. High Spin States in ^24Mg

    Schwartz, J.; Lister, C. J.; Wuosmaa, A.; Betts, R. R.; Blumenthal, D.; Carpenter, M. P.; Davids, C. N.; Fischer, S. M.; Hackman, G.; Janssens, R. V. F.


    The ^12C(^16O,α)^24Mg reaction was used at 51.5MeV to populate high angular momentum states in ^24Mg. Gamma-rays de-exciting high spin states were detected in a 20 detector spectrometer (the AYE-ball) triggered by the ANL Fragment Mass Analyser (FMA). Channel selection, through detection of ^24Mg nuclei with the appropriate time of flight, was excellent. All the known decays from high spin states were seen in a few hours, with the exception of the 5.04 MeV γ-decay of the J^π=9^- state at 16.904 MeV footnote A.E.Smith et al., Phys. Lett. \\underlineB176, (1986)292. which could not be confirmed. The potential of the technique for studying the radiative decay of states with very high spin in light nuclei will be discussed.

  11. Phase equilibrium in Mg-Cu-Y

    Mezbahul-Islam, Mohammad; Medraj, Mamoun


    Magnesium-based bulk metallic glasses (BMG) have potential in applications ranging from biomedical to sports equipment and the Mg-Cu-Y system offers some of the most promising alloys. Phase relations and ternary solubility of the binary and ternary compounds of this system have been experimentally investigated. The Isothermal section of Mg-Cu-Y system at 673 K for the entire composition range has been constructed. Phase relations in the Cu-rich (>66 at.% Cu) region of the Mg-Cu-Y system has been determined for the first time. The homogeneity range of three ternary compounds has been determined. Solidifications behavior of several key alloys have been discussed based on the differential scanning calorimetry (DSC) experiments and thermodynamic calculations. Extensive analysis of the DSC curves has been carried out to relate them to the corresponding phase transformation reactions and temperatures. Some of the most promising metallic glass forming regions have been analyzed using thermodynamic calculations.

  12. Miconazole nitrate vaginal suppository 1,200 mg versus oral fluconazole 150 mg in treating severe vulvovaginal candidiasis.

    Fan, Shangrong; Liu, Xiaopingliu; Liang, Yiheng


    Miconazole is a synthetic imidazole antifungal that has a broad spectrum of activity against Candida albicans and non-albicans Candida species. The aim of this study was to evaluate the efficacy and safety of miconazole nitrate vaginal suppository and oral fluconazole in treating severe vulvovaginal candidiasis (SVVC). In this prospective, randomized case control study, 577 cases of consecutive patients with SVVC were studied at the Gynecological Clinic of Peking University Shenzhen Hospital from January 1, 2009 through December 31, 2010. Patients with SVVC were treated with two doses of miconazole nitrate vaginal suppository 1,200 mg or two doses of fluconazole 150 mg. The patients were followed up for 7-14 and 30-35 days following the second dose of therapy. The mycological cure rates of the patients on days 7-14 of follow-up were 75.9% (220/290) and 84.0% (241/287) in the miconazole and fluconazole groups, respectively (p 0.05). The study demonstrated that two doses of miconazole nitrate vaginal suppository 1,200 mg were as effective as two doses of an oral fluconazole 150 mg regimen in the treatment of patients with SVVC. © 2015 S. Karger AG, Basel.

  13. Superconductivity in MgB2


    In January of 2001 the superconductivity of the compound MgB2 with a critical temperature Tc of up to 39 K was discovered. This Tc is the highest in all intermetallic compound and alloy superconductors. MgB2 has a simple structure and its manufacturing capital cost is lower, therefore it could become a practical superconductor in the future. The recent progress is reviewed here which covers the progress in electronic structure, high Tc mechanism, superconducting parameters (Debye temperature, specific heat coefficient of electron, critical fields, coherent length, penetration depth, energy gap, critical current and relaxation rate of flux). Moreover the issue on power transmission is discussed.

  14. Electron microscopy observations of MgB 2 wire prepared by an internal Mg diffusion method

    Shimada, Y.; Kubota, Y.; Hata, S.; Ikeda, K.; Nakashima, H.; Matsumoto, A.; Togano, K.; Kumakura, H.


    Microstructure in a high-density MgB2 wire fabricated by an internal Mg diffusion (IMD) process has been investigated by electron microscopy imaging and analysis at different scales. In the IMD process, a pure Mg rod was used as Mg source, and nanosized SiC powders were mixed with amorphous B powders. In the case of a heat treatment at 640 °C for 1 h carried out after rolling and drawing processes, the wire has two microstructural features that degrade critical current density: uncrystallized zones composed mainly of unreacted B and SiC powders, and cracks partly filled with course Mg2Si crystals. Those cracks were formed in the uncrystallized zones as well as in crystallized MgB2 zones. It indicate that the cracks formed by the mechanical milling and drawing remain after the heat treatment.

  15. Efficient hydrogen storage with the combination of lightweight Mg/MgH2 and nanostructures.

    Cheng, Fangyi; Tao, Zhanliang; Liang, Jing; Chen, Jun


    Efficient hydrogen storage plays a key role in realizing the incoming hydrogen economy. However, it still remains a great challenge to develop hydrogen storage media with high capacity, favourable thermodynamics, fast kinetics, controllable reversibility, long cycle life, low cost and high safety. To achieve this goal, the combination of lightweight materials and nanostructures should offer great opportunities. In this article, we review recent advances in the field of chemical hydrogen storage that couples lightweight materials and nanostructures, focusing on Mg/MgH(2)-based systems. Selective theoretical and experimental studies on Mg/MgH(2) nanostructures are overviewed, with the emphasis on illustrating the influences of nanostructures on the hydrogenation/dehydrogenation mechanisms and hydrogen storage properties such as capacity, thermodynamics and kinetics. In particular, theoretical studies have shown that the thermodynamics of Mg/MgH(2) clusters below 2 nm change more prominently as particle size decreases.

  16. Low dose Mifepristone (100 mg for medical termination of pregnancy

    Shikha Seth


    Full Text Available Background: Abortion is the most common entity in the practice of obstetrics and gynaecology. Different methods and modes have been opted for until now to find an effective regimen with the least complications. We have tried the minimal dose (100 mg of Mifepristone (PO instead of the presently recommended 200 mg for medical abortion in early first trimester cases. Objectives: The objective of the study was to determine the efficacy of low dose (100 mg Mifepristone for medical termination of early pregnancy with oral Misoprostol 800 μg, 24 hours later.Design: A prospective analytical study was conducted on a population of 82 early-pregnant patients who have requested medical abortions.Method: Pregnant women of less than 56 days gestation age from their last menstrual period, requesting medical abortion were selected over a period of 14 months from January 2007 to March 2008. They were given 100 mg Mifepristone orally on Day-1, followed by 800 μg Misoprostol orally 24 hours later on Day-2, keeping the patient in the ward for at least 6 hours. Abortion interval, success rate, post-abortion bleeding and side-effects were noted. Success was defined as complete uterine evacuation without the need for surgical intervention.Results: The total success rate of this minimal dose Mifepristone regimen was 96.25%. Pain and nausea were the predominant side-effects noted. In total 72 (90% women had completely aborted within 5 hours of taking Misoprostol. Three (3.75% women only required suction aspiration, hence termed as failed medical abortion. The abortion interval increased with the gestation age. All three failures were of the more-than-42-day gestational age group. The overall mean abortion interval was 4.68 ± 5.32 hours.Conclusion: Mifepristone 100 mg, followed 24 hours later by Misoprostol 800 μg orally, is a safe and effective regimen for medical abortion.

  17. Preparation and Characterization of the New Superconductor MgB2

    SUN Yu-Ping; ZHAO Zhong-Xian; SONG Wen-Hai; DAI Jian-Ming; WU Xing-Cai; WANG Kai-You; ZHAO Bing; XIAO Hong; DU Jia-Ju; WEN Hai-Hu


    Polycrystalline samples of the new superconductor MgB2 are prepared by a solid-state reaction using Mg and Bpowders. The resistance measurement shows that the onset transition temperature and zero resistance transitiontemperature are Tonsetc = 43.8 K and Tc0 = 37 K, respectively. The Tco strongly depends on measuring current. The diamagnetic transition temperature of ~38 K is obtained by the ac susceptibility measurement. X-ray powderdiffraction spectra of MgB2 can be indexed using hexagonal structure with space group P6/mmm and latticeparameters a = 0.30864 and c = 0.35212 nm. A second phase, probably MgO, is also found.

  18. The reactive Mg-liquid infiltration to obtain long superconducting MgB$_{2}$ cables

    Giunchi, G


    An alternative “in situ” process to the MgB2 wire manufacturing is represented by the Reactive Mg-Liquid Infiltration (Mg-RLI) process [1], in which the precursor wire is constituted by a metallic sheath encasing a central Mg rod, surrounded by the B powders. We demonstrated that this peculiar “internal Mg” assembly is able to produce very dense superconducting material of high critical current density, with an acceptable fill factor, up to 0.28. Furthermore the Mg-RLI allows also to easily dope the MgBB2 material either by carbon or nanoSiC powders. In order to realize long cables with this technique, two different approaches may be applied. The first one relies on the assembly of thin wires, fine enough that the liquid Mg cannot freely percolate along the wire during the reaction, and the second one relies on the assembly of thick hollow wires, reacted with a continuous supply of Mg to avoid deficiency of Mg in some part of the precursor wire. Both techniques have been demonstrated feasible and the ...

  19. The Interplay of Al and Mg Speciation in Advanced Mg Battery Electrolyte Solutions.

    See, Kimberly A; Chapman, Karena W; Zhu, Lingyang; Wiaderek, Kamila M; Borkiewicz, Olaf J; Barile, Christopher J; Chupas, Peter J; Gewirth, Andrew A


    Mg batteries are an attractive alternative to Li-based energy storage due to the possibility of higher volumetric capacities with the added advantage of using sustainable materials. A promising emerging electrolyte for Mg batteries is the magnesium aluminum chloride complex (MACC) which shows high Mg electrodeposition and stripping efficiencies and relatively high anodic stabilities. As prepared, MACC is inactive with respect to Mg deposition; however, efficient Mg electrodeposition can be achieved following an electrolytic conditioning process. Through the use of Raman spectroscopy, surface enhanced Raman spectroscopy, (27)Al and (35)Cl nuclear magnetic resonance spectroscopy, and pair distribution function analysis, we explore the active vs inactive complexes in the MACC electrolyte and demonstrate the codependence of Al and Mg speciation. These techniques report on significant changes occurring in the bulk speciation of the conditioned electrolyte relative to the as-prepared solution. Analysis shows that the active Mg complex in conditioned MACC is very likely the [Mg2(μ-Cl)3·6THF](+) complex that is observed in the solid state structure. Additionally, conditioning creates free Cl(-) in the electrolyte solution, and we suggest the free Cl(-) adsorbs at the electrode surface to enhance Mg electrodeposition.

  20. Comparing Doping Methodologies in Mg2Si/AgMg System

    Polymeris, G. S.; Theodorakakos, A.; Mars, K.; Godlewska, E.; Lioutas, Ch. B.; Hatzikraniotis, E.; Paraskevopoulos, K. M.


    Morphological and optical characterizations for the Mg2Si samples doped with Ag are presented. Two different doping methodologies with silver, namely in situ and ex situ doping, were studied for the case of Mg2Si of self-propagating high-temperature synthesis. Electron microscopy measurements in both scanning and transmission configurations verified the presence of AgMg precipitates embedded in the Mg2Si matrix and similar results were also yielded by FTIR spectroscopy. Finally, the dependence of silver content in both forms of dopant and inter-metallic constituent is studied upon doping technology.

  1. Confinement of Mg-MgH2 systems into carbon nanotubes changes hydrogen sorption energetics.

    Liang, Jian-jie; Kung, W-C Paul


    The density functional theory (DFT) method was used to study the effect of nanoconfinement on the energetics of Mg-MgH2 systems. Varying levels of loading of the Mg/MgH2 particles into a (10,10) carbon nanotube were examined, and the corresponding energetics were computed. A clear trend was observed that, as the level of loading increases (increasing confinement), the net energy change in the hydrogen sorption/desorption processes decreases to a significant level when the loading approaches the maximum. The confinement was found not to depend on the tube length of the confining nanotubes.

  2. Necessary actions in order to reduce the probability for a region being without power supply for a longer period; Tiltak for aa redusere sannsynligheten for at et omraade er stroemloest over lang tid

    Ulsberg, Helge; Gaaserud, Oeystein; Loneland, Knut; Kristensen, Roar


    In January 2007 the inhabitants of the municipality of Steigen in Nordland county experienced a protracted power failure in the main power supply. A storm led to a breakdown on one of the two power supply lines which serve the region. The remaining power line turned out to be in such a bad condition that it did not stand up to the increased load. In November 2007 an excavator caused serious damage to the power distribution network in Oslo. The railways in the Eastern central region of Norway including Oslo came to a total halt. Critical societal functions were cut off from data communication for 10 hours. Both cases aroused considerable media interest and clearly demonstrated society's dependency of a reliable power supply. During the summer of 2007 NVE Norwegian Water Resources and Energy Directorate initiated the establishment of a joint project group, with representatives from Statnett SF (the main national grid owner and operator), the Directorate for Civil Defence and Emergency Planning and NVE. The objective was to analyse and assess the need for relevant improvement in procedures, guidance and regulations, in order to reduce the possibility of a similar incident, meaning a region without power supply over a longer period. The procedure project has a main limitation where it meets with the responsibilities of the power network suppliers. The basis for the project activities are the Energy Act and the Act on Supervision of Electricity Installations and Networks with further regulations. The project will sum up conditions and elements which are of vital importance when it comes to reduce the possibility of an extensive power failure: The correct and solid planning of the plants; The control during the construction process and after the finalization; The systematic control and implementation of maintenance and refurbishment; The updating of the plants in order to ensure delivery quality and safety level; Develop risk and vulnerability analyses for extreme


    L. Taylor


    Communications Infrastructure The 55 CMS Centres worldwide are well used by physicists working on remote CMS shifts, Computing operations, data quality monitoring, data analysis and outreach. The CMS Centre@CERN in Meyrin is particularly busy at the moment, hosting about 50 physicists taking part in the heavy-ion data-taking and analysis. Three new CMS meeting room will be equipped for videoconferencing in early 2012: 40/5B-08, 42/R-031, and 28/S-029. The CMS-TV service showing LHC Page 1, CMS Page 1, etc. ( is now also available for mobile devices: Figure 12: Screenshots of CMS-TV for mobile devices Information Systems CMS has a new web site: ( using a modern web Content Management System to ensure content and links are managed and updated easily and coherently. It covers all CMS sub-projects and groups, replacing the iCMS internal pages. It also incorporates the existing CMS public web site (http:/...


    L. Taylor


      Outreach and Education We are fortunate that our research has captured the public imagination, even though this inevitably puts us under the global media spotlight, as we saw with the Higgs seminar at CERN in December, which had 110,000 distinct webcast viewers. The media interest was huge with 71 media organisations registering to come to CERN to cover the Higgs seminar, which was followed by a press briefing with the DG and Spokespersons. This event resulted in about 2,000 generally positive stories in the global media. For this seminar, the CMS Communications Group prepared up-to-date news and public material, including links to the CMS results, animations and event displays []. There were 44,000 page-views on the CMS public website, with the Higgs news article being by far the most popular item. CMS event displays from iSpy are fast becoming the iconic media images, featuring on numerous major news outlets (BBC, CNN, MSN...) as well as in the sci...


    L. Taylor


    The recently established CMS Communications Group, led by Lucas Taylor, has been busy in all three of its main are areas of responsibility: Communications Infrastructure, Information Systems, and Outreach and Education Communications Infrastructure The damage caused by the flooding of the CMS Centre@CERN on 21st December has been completely repaired and all systems are back in operation. Major repairs were made to the roofs, ceilings and one third of the floor had to be completely replaced. Throughout these works, the CMS Centre was kept operating and even hosted a major press event for first 7 TeV collisions, as described below. Incremental work behind the scenes is steadily improving the quality of the CMS communications infrastructure, particularly Webcasting, video conferencing, and meeting rooms at CERN. CERN/IT is also deploying a pilot service of a new videoconference tool called Vidyo, to assess whether it might provide an enhanced service at a lower cost, compared to the EVO tool currently in w...

  6. Effect of Mg-Nb oxides addition on hydrogen sorption in MgH{sub 2}

    Rahman, M.W.; Castellero, A. [Dipartimento di Chimica IFM, NIS Centre of Excellence, Universita di Torino, Via Pietro Giuria 9, 10125 Torino (Italy); Enzo, S. [Dipartimento di Chimica, Universita di Sassari, 07100 Sassari (Italy); Livraghi, S.; Giamello, E. [Dipartimento di Chimica IFM, NIS Centre of Excellence, Universita di Torino, Via Pietro Giuria 9, 10125 Torino (Italy); Baricco, M., E-mail: [Dipartimento di Chimica IFM, NIS Centre of Excellence, Universita di Torino, Via Pietro Giuria 9, 10125 Torino (Italy)


    Highlights: > H{sub 2} sorption reactions in MgH{sub 2} with 1 mol% MgNb{sub 2}O{sub 6}, Mg{sub 4}Nb{sub 2}O{sub 9} and Mg{sub 3}Nb{sub 6}O{sub 11} have been investigated. > Ball-milled samples showed the presence of a mixture of {beta} and {gamma} allotropes of MgH{sub 2}. > The presence of Mg-Nb oxides significantly accelerates the hydrogen absorption and desorption processes. > Experimental results are discussed on the basis of thermodynamic and kinetic arguments. - Abstract: H{sub 2} absorption and desorption reactions in MgH{sub 2} promoted by ball-milling with 1 mol% MgNb{sub 2}O{sub 6}, Mg{sub 4}Nb{sub 2}O{sub 9} and Mg{sub 3}Nb{sub 6}O{sub 11} have been investigated. MgH{sub 2} was milled with the bare oxides for 12 h under a high purity Ar atmosphere. Absorption and desorption reactions in the ball-milled samples were studied by in situ X-ray diffraction (XRD) in isothermal conditions with Anton Paar XRK 900 reaction chamber. XRD patterns for absorption were recorded at 573 K under hydrogen pressure of 0.9 MPa and for desorption at 623 K in vacuum. Experimental data were analysed according to the Rietveld method. Ball-milled samples showed the presence of a mixture of {beta} and {gamma} allotropes of MgH{sub 2}, with significantly broadened diffraction peaks due to reduced crystallite size and strain, together with bare additives. The presence of Mg-Nb oxides significantly accelerates the hydrogen absorption and desorption processes. The amount of hydrogen absorbed in the presence of Mg-Nb-O phases is lower than the maximum stoichiometric capacity, because of the presence of a non-reactive MgO layer on the surface of the powders or at the grain boundaries. Experimental results are discussed on the basis of thermodynamic and kinetic arguments.

  7. Preparation of an additive-free sample with a MgH2 phase by planetary ball milling of Mg with10 wt% MgH2

    Hong, Seong-Hyeon; Song, Myoung Youp


    In order to prepare an additive-free sample with a MgH2 phase, 90 wt% Mg+10 wt% MgH2 (named Mg-10MgH2) was milled under hydrogen atmosphere in a planetary ball mill for different durations (2 h, 5 h, and 10 h). The hydrogen absorption and release properties of the prepared samples were investigated and compared with those of purchased pure MgH2 samples. Mg-10MgH2 milled for 5 h had the largest quantity of hydrogen released at 648 K for 100 min of 5.96 wt%. Mg-10MgH2 milled for 5 h released 0.11 wt% H for 10 min, 4.85 wt% H for 30 min, and 5.83 wt% H for 60 min at 648 K at the first cycle. Mg-10MgH2 milled for 5 h absorbed 5.39 wt% H for 5 min and 5.92 wt% H for 60 min at 648 K at the second cycle. Dehydriding curves were also obtained at the first cycle of Mg-10MgH2 samples milled for 5 h using Mg powder with or without sieving (200 mesh). The dehydriding curve at 648 K of a Mg-10MgH2 sample milled for 5 h in the planetary ball mill was compared with that of the sample milled for 24 h in a horizontal ball mill.

  8. Necessary actions in order to reduce the probability for a region being without power supply for a longer period; Tiltak for aa redusere sannsynligheten for at et omraade er stroemloest over lang tid

    Ulsberg, Helge; Gaaserud, Oeystein; Loneland, Knut; Kristensen, Roar


    In January 2007 the inhabitants of the municipality of Steigen in Nordland county experienced a protracted power failure in the main power supply. A storm led to a breakdown on one of the two power supply lines which serve the region. The remaining power line turned out to be in such a bad condition that it did not stand up to the increased load. In November 2007 an excavator caused serious damage to the power distribution network in Oslo. The railways in the Eastern central region of Norway including Oslo came to a total halt. Critical societal functions were cut off from data communication for 10 hours. Both cases aroused considerable media interest and clearly demonstrated society's dependency of a reliable power supply. During the summer of 2007 NVE Norwegian Water Resources and Energy Directorate initiated the establishment of a joint project group, with representatives from Statnett SF (the main national grid owner and operator), the Directorate for Civil Defence and Emergency Planning and NVE. The objective was to analyse and assess the need for relevant improvement in procedures, guidance and regulations, in order to reduce the possibility of a similar incident, meaning a region without power supply over a longer period. The procedure project has a main limitation where it meets with the responsibilities of the power network suppliers. The basis for the project activities are the Energy Act and the Act on Supervision of Electricity Installations and Networks with further regulations. The project will sum up conditions and elements which are of vital importance when it comes to reduce the possibility of an extensive power failure: The correct and solid planning of the plants; The control during the construction process and after the finalization; The systematic control and implementation of maintenance and refurbishment; The updating of the plants in order to ensure delivery quality and safety level; Develop risk and vulnerability analyses for extreme

  9. Destabilization of Mg Hydride by Self-Organized Nanoclusters in the Immiscible Mg-Ti System

    Asano, Kohta; Westerwaal, Ruud J.; Anastasopol, Anca; Mooij, Lennard P A; Boelsma, Christiaan; Ngene, Peter; Schreuders, Herman; Eijt, Stephan W H; Dam, Bernard


    Mg is an attractive hydrogen storage material not only because of its high gravimetric and volumetric hydrogen capacities but also because of it low material costs. However, the hydride of MgH2 is too stable to release hydrogen under moderate conditions. We demonstrate that the formation of

  10. Energy Bands and Fermi Surface for beta-MgMh and beta-MgTl

    Skriver, Hans Lomholt


    The energy bands of ordered β′-MgHg and β′-MgTl have been calculated by the relativistic linear-muffintin-orbital method. We show how the gross features of the energy bands may be estimated from Wigner-Seitz rules. The densities of states are calculated and the heat capacities derived. The Fermi...

  11. Destabilization of Mg Hydride by Self-Organized Nanoclusters in the Immiscible Mg-Ti System

    Asano, Kohta; Westerwaal, Ruud J.; Anastasopol, Anca; Mooij, Lennard P A; Boelsma, Christiaan; Ngene, Peter; Schreuders, Herman; Eijt, Stephan W H; Dam, Bernard


    Mg is an attractive hydrogen storage material not only because of its high gravimetric and volumetric hydrogen capacities but also because of it low material costs. However, the hydride of MgH2 is too stable to release hydrogen under moderate conditions. We demonstrate that the formation of nanomete

  12. Cytotoxic effects of MgO nanoparticles on human umbilical vein endothelial cells in vitro.

    Ge, S; Wang, G; Shen, Y; Zhang, Q; Jia, D; Wang, H; Dong, Q; Yin, T


    The MgO nanoparticles are widely used in many fields. However, the toxicity of these nanoparticles to cells and organs remains fairly undiscovered. In this study, the cytotoxicity of MgO nanoparticles on human umbilical vein endothelial cells (HUVECs) in vitro was examined. The morphology and size of MgO nanoparticles were analysed by the transmission electron microscope (TEM) and nanoparticle size analyser. MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2 h-tetrazolium bromide) assay, 4',6-diamidino-2-phenylindole (DAPI) staining analysis, NO release and total antioxidation competence (T-AOC) assay were used to evaluate the cytotoxicity of MgO nanoparticles. The results showed that most MgO nanoparticles were spherical with agglomerated state and the diameter of single particle was about 100 nm. Meanwhile, low concentration (below 200 [micro sign]g/ml) of MgO nanoparticles suspension showed no cytotoxicity by MTT assay. However, once the concentration of MgO nanoparticles was higher than 500 [micro sign]g/ml, the relative growth rate was lower than the control. The DAPI staining analysis results showed no significant difference of the cells morphology between the groups with or without MgO nanoparticles. In addition, the MgO nanoparticles significantly enhanced the NO release and T-AOC content of the HUVECs. The testing results indicated that low concentration of MgO nanoparticles exhibited non-cytotoxicity.

  13. Proteome of Salmonella enterica serotype Tyhimurium Grown in Low Mg2+/pH Medium

    Shi, Liang; Ansong, Charles; Smallwood, Heather S.; Rommereim, Leah M.; McDermott, Jason E.; Brewer, Heather M.; Norbeck, Angela D.; Taylor, Ronald C.; Gustin, Jean K.; Heffron, Fred; Smith, Richard D.; Adkins, Joshua N.


    To determine the impact of a low Mg2+/pH defined growth medium (MgM) on the proteome of Salmonella enterica serotype Typhimurium, we cultured S. Typhimurium cells in the medium under two different conditions termed MgM Shock and MgM Dilution and then comparatively analyzed the bacterial cells harvested from these conditions by a global proteomic approach. Proteomic results showed that MgM Shock and MgM Dilution differentially affected the S. Typhimurium proteome. MgM Shock induced a group of proteins whose induction usually occurred at low O2 level, while MgM Dilution induced those related to the type III secretion system (T3SS) of Salmonella Pathogenicity Island 2 (SPI2) and those involved in thiamine or biotin biosynthesis. The metabolic state of the S. Typhimurium cells grown under MgM Shock condition also differed significantly from that under MgM Dilution condition. Western blot analysis not only confirmed the proteomic results, but also showed that the abundances of SPI2-T3SS proteins SsaQ and SseE and biotin biosynthesis proteins BioB and BioD increased after S. Typhimurium infection of RAW 264.7 macrophages. Deletion of the gene encoding BioB reduced the bacterial ability to replicate inside the macrophages, suggesting a biotin-limited environment encountered by S. Typhimurium within RAW 264.7 macrophages.

  14. Wide pH range for fluoride removal from water by MHS-MgO/MgCO₃ adsorbent: kinetic, thermodynamic and mechanism studies.

    Zhang, Kaisheng; Wu, Shibiao; Wang, Xuelong; He, Junyong; Sun, Bai; Jia, Yong; Luo, Tao; Meng, Fanli; Jin, Zhen; Lin, Dongyue; Shen, Wei; Kong, Lingtao; Liu, Jinhuai


    A novel environment friendly adsorbent, micro-nano hierarchical structured flower-like MgO/MgCO3 (MHS-MgO/MgCO3), was developed for fluoride removal from water. The adsorbent was characterized and its defluoridation properties were investigated. Adsorption kinetics fitted well the pseudo-second-order model. Kinetic data revealed that the fluoride adsorption was rapid, more than 83-90% of fluoride could be removed within 30 min, and the adsorption equilibrium was achieved in the following 4 h. The fluoride adsorption isotherm was well described by Freundlich model. The maximum adsorption capacity was about 300 mg/g at pH=7. Moreover, this adsorbent possessed a very wide available pH range of 5-11, and the fluoride removal efficiencies even reached up to 86.2%, 83.2% and 76.5% at pH=11 for initial fluoride concentrations of 10, 20 and 30 mg/L, respectively. The effects of co-existing anions indicated that the anions had less effect on adsorption of fluoride except phosphate. In addition, the adsorption mechanism analysis revealed that the wide available pH range toward fluoride was mainly resulted from the exchange of the carbonate and hydroxyl groups on the surface of the MHS-MgO/MgCO3 with fluoride anions.

  15. Mesoporous carbon stabilized MgO nanoparticles synthesized by pyrolysis of MgCl2 preloaded waste biomass for highly efficient CO2 capture.

    Liu, Wu-Jun; Jiang, Hong; Tian, Ke; Ding, Yan-Wei; Yu, Han-Qing


    Anthropogenic CO2 emission makes significant contribution to global climate change and CO2 capture and storage is a currently a preferred technology to change the trajectory toward irreversible global warming. In this work, we reported a new strategy that the inexhaustible MgCl2 in seawater and the abundantly available biomass waste can be utilized to prepare mesoporous carbon stabilized MgO nanoparticles (mPC-MgO) for CO2 capture. The mPC-MgO showed excellent performance in the CO2 capture process with the maximum capacity of 5.45 mol kg(-1), much higher than many other MgO based CO2 trappers. The CO2 capture capacity of the mPC-MgO material kept almost unchanged in 19-run cyclic reuse, and can be regenerated at low temperature. The mechanism for the CO2 capture by the mPC-MgO was investigated by FTIR and XPS, and the results indicated that the high CO2 capture capacity and the favorable selectivity of the as-prepared materials were mainly attributed to their special structure (i.e., surface area, functional groups, and the MgO NPs). This work would open up a new pathway to slow down global warming as well as resolve the pollution of waste biomass.

  16. Modification effect of lanthanum on primary phase Mg2Si in Mg-Si alloys

    WANG Liping; GUO Erjun; MA Baoxia


    The modifying effect of La addition on primary phase Mg2Si in Mg-5Si alloys was investigated. The results showed that a proper amount of La could effectively modify the primary phase Mg2Si. Based on the present experiment, the optimal modification effect was obtained with an addition of about 0.5 wt.% La. The size of the primary phase Mg2Si was considerably reduced to 25 μm or less and the morphology was modified from a coarse dendritic shape to a polyhedral shape. However, when the addition of La increased to 0.8 wt.% or higher, the primary Mg2Si grew into a coarse dendritic morphology again. Moreover, it was found that some LaSi2 compounds were formed during solidification and the amount of the compounds appeared to increase gradually with increasing La content.

  17. Microstructure and hardness of Mg-based composites reinforced with Mg2Si particles

    Mustafa Aydin; Cem Ozgür; Osman San


    Magnesium powders were mechanically alloyed with SiO2 powder particles having different particle sizes using high-energy ball milling techniques under Ar atmosphere for 1 h. The powders were consolidated with cold pressing under 560 Mpa. They were then sintered at 550℃ for 45 min under Ar atmosphere. The composites obtained on the Mg-SiO2 system were investigated using the Archimedes principle, a differential scanning calorimeter, X-ray diffraction, optic microscopy, and scanning electron microscopy. For the mechanically alloyed powders, the solid-state reaction of the synthesis of Mg2Si and MgO progressed further during sintering of the materials. The results showed that the strengthening mechanisms were dependent on dispersion hardening of fine Mg2Si and MgO particulates dispersed homogeneously in the matrix.

  18. Growth of MgO on multi-layered graphene and Mg in PVA matrix

    Marka, Sandeep K.; Mohiddon, Md. Ahamad; Prasad, Muvva D.; Srikanth, Vadali V. S. S.


    An easy and low temperature in-situ growth of MgO micro-rods on multi-layered graphene (MLG) in poly vinyl alcohol (PVA) matrix is elucidated. MLG decked with nanosized fragments of MgO and PVA are used as the starting materials to form MgO micro-rods (width = ∼1 μm and length = ∼4 μm) and MLG filled PVA composite film. Simple solution mixing, spin coating and simple drying processes are used to obtain the PVA composite. The growth mechanism of MgO micro-rods and the role of PVA in the growth of MgO micro-rods are explained on the basis of the observed morphological, structural and phase characteristics and a further controlled synthesis experiment, respectively.

  19. Mg based alloys obtained by mechanical alloying

    Ordonez, S. [Univ. de Santiago de Chile (Chile). Fac. de Ingenieria; Garcia, G.; Serafini, D.; San Martin, A.


    In the present work, we studied the production of magnesium alloys, of stoichiometry 2Mg + Ni, by mechanical alloying (MA) and the behavior of the alloys under hydrogen in a Sievert`s type apparatus. The elemental powders were milled under argon atmosphere in a Spex 8000 high energy ball mill. The milled materials were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Only minimum amounts of the Mg{sub 2}Ni intermetallic compound was obtained after 22 h of milling time. Most of the material was sticked to the inner surface of the container as well as to the milling balls. Powders milled only for 12 hours transforms to the intermetallic at around 433 K. Effects of the MA on the hydrogen absorption kinetics were also studied. (orig.) 10 refs.

  20. Bulk amorphous Mg-based alloys

    Pryds, Nini


    The present paper describes the preparation and properties of bulk amorphous quarternary Mg-based alloys and the influence of additional elements on the ability of the alloy to form bulk amorphous. The main goal is to find a Mg-based alloy system which shows both high strength to weight ratio...... and a low glass transition temperature. The alloys were prepared by using a relatively simple technique, i.e. rapid cooling of the melt in a copper wedge mould. The essential structural changes that are achieved by going from the amorphous to the crystalline state through the supercooled liquid state...... are discussed in this paper. On the basis of these measurements phase diagrams of the different systems were constructed. Finally, it is demonstrated that when pressing the bulk amorphous alloy onto a metallic dies at temperatures within the supercooled liquid region, the alloy faithfully replicates the surface...

  1. Novel alginate based coatings on Mg alloys

    Sangeetha, K.; Roy, Abhijit [Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15261 (United States); Singh, Satish [Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, PA 15261 (United States); Lee, Boeun [Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15261 (United States); Kumta, Prashant N., E-mail: [Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15261 (United States); Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, PA 15261 (United States); Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA 15261 (United States); Center for Complex Engineered Multifunctional Materials, University of Pittsburgh, Pittsburgh, PA 15261 (United States); Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261 (United States)


    Coatings on yttrium doped magnesium (Mg4Y) alloy substrates were prepared using alginate hydrogels by dip coating method to improve the surface bioactive properties of the substrate. Furthermore, composite coatings containing nano-sized calcium phosphate corresponding to hydroxyapatite (HA) phase entrapped within alginate hydrogel were also synthesized on the Mg4Y substrates. Surface characteristics of these coated substrates have been investigated using FTIR-ATR, SEM and EDS. The results show that the coatings with alginate alone are not stable in vitro; however, incorporation of NanoCaPs slightly improves the stability of these coatings. In addition, these composite coatings showed cell attachments with fibronectin incorporation. These results indicate that alginate hydrogels have the potential to be used as bioactive coating materials for different biofunctional applications.

  2. Electronic structure of MgB2

    P Modak; R S Rao; B K Godwal; S K Sikka


    Results of ab initio electronic structure calculations on the compound MgB2 using the FPLAPW method employing GGA for the exchange-correlation energy are presented. Total energy minimization enables us to estimate the equilibrium volume, / ratio and the bulk modulus, all of which are in excellent agreement with experiment. We obtain the mass enhancement parameter by using our calculated (F) and the experimental specific heat data. The c is found to be 24.7 K.

  3. Orientation relationships between icosahedral clusters in hexagonal MgZn2 and monoclinic Mg4Zn7 phases in Mg-Zn(-Y) alloys

    Rosalie, Julian M.; Somekawa, Hidetoshi; Singh, Alok; Mukai, Toshiji


    Intermetallic precipitates formed in heat-treated and aged Mg-Zn and Mg-Zn-Y alloys have been investigated via electron microscopy. Coarse spheroidal precipitates formed on deformation twin boundaries contained domains belonging to either the MgZn2 hexagonal Laves phase or the monoclinic Mg4Zn7 phase. Both phases are structurally related to the quasi-crystalline phase formed in Mg-Zn-Y alloys, containing icosahedrally coordinated zinc atoms arranged as a series of broad rhombohedral units. This rhombohedral arrangement was also visible in intragranular precipitates where local regions with the structures of hexagonal MgZn2 and Mg4Zn7 were found. The orientation adopted by the MgZn2 and Mg4Zn7 phases in twin-boundary and intragranular precipitates was such that the icosahedral clusters were aligned similarly. These results highlight the close structural similarities between the precipitates of the Mg-Zn-Y alloy system.

  4. Interstitial Fe in MgO

    Mølholt, T E; Gunnlaugsson, H P; Svane, A; Masenda, H; Naidoo, D; Bharuth-Ram, K; Fanciulli, M; Gislason, H P; Johnston, K; Langouche, G; Ólafsson, S; Sielemann, R; Weyer, G


    Isolated Fe-57 atoms were studied in MgO single-crystals by emission Mossbauer spectroscopy following implantation of Mn-57 decaying to Fe-57. Four Mossbauer spectral components were found corresponding to different Fe lattice positions and/or charge states. Two components represent Fe atoms substituting Mg as Fe2+ and Fe3+, respectively; a third component is due to Fe in a strongly implantation-induced disturbed region. The fourth component, which is the focus of this paper, can be assigned to Fe at an interstitial site. Comparison of its measured isomer shift with ab initio calculations suggests that the interstitial Fe is located on, or close to, the face of the rock-salt MgO structure. To harmonize such an assignment with the measured near-zero quadrupole interaction a local motion process (cage motion) of the Fe has to be stipulated. The relation of such a local motion as a starting point for long range diffusion is discussed.

  5. Comparison of hydrogen storage properties of pure Mg and milled pure Mg

    Myoung Youp Song; Young Jun Kwak; Seong Ho Lee; Hye Ryoung Park


    Hydrogen storage properties of pure Mg were studied at 593 K under 12 bar H2. In order to increase the hydriding and dehydriding rates, pure Mg was ground under hydrogen atmosphere (reactive mechanical grinding, RMG) and its hydrogen storage properties were subsequently investigated. Pure Mg absorbed hydrogen very slowly. At the number of cycles () of 1, pure Mg absorbed 0.05 wt% H for 5 min, 0.08 wt% H for 10 min and 0.29 wt% H for 60 min at 593 K under 12 bar H2. Activation was completed at the fifth cycle. At = 6, pure Mg absorbed 1.76 wt% H for 5 min, 2.17 wt% H for 10 min and 3.40 wt% H for 60 min. The activation of pure Mg after RMG was completed at the sixth cycle. At = 7, pure Mg after RMG absorbed 2.57 wt% H for 5 min, 3.21 wt% H for 10 min and 4.15 wt% H for 60 min.


    Hema Divakar


    Full Text Available BACKGROUND The aim of the study is to determine the non-inferiority of a single dose of 500 mg Ferric Carboxymaltose (FCM (Group 1 to a single dose of 1000 mg (Group 2 in treating women with postpartum anaemia. MATERIALS AND METHODS Women were recruited within 24 hours of delivery and randomised to one of the two study groups excluded were mothers with non-iron deficiency anaemia, iron intolerance and haematological disease. Haematological markers were measured at baseline and at 6 weeks after treatment. Main Outcome Measures- The primary outcome was an Hb increase ≥20 g/L. Secondary outcomes included the proportion of patients attaining Hb ≥120 g/L and the mean Hb change. Design- Open label, randomised, non-blinded, prospective study. Setting- Maternity units of four hospitals in Southern India. Population- Women ≥18 years old with haemoglobin of >60 - 20 g/L between Groups 1 and 2 (91.4% versus 96.7%. Similar proportions of women in both groups became non-anaemic achieving an Hb of >120 g/L (57% versus 45.7%. The mean Hb change was comparable between the groups and both doses were well tolerated. CONCLUSION A single dose of 500 mg FCM (cost INR 2000.00 is non-inferior to a 1000 mg dose (cost INR 5000.00 in the treatment of postpartum anaemia. This has major implications for the scaling up of the eradication of iron-deficiency anaemia in India, since double the number of women who would otherwise have been treated with the 1000 mg dose can be treated with half the dose at less than half the cost with similar outcomes. Tweetable Abstract- A single dose of 500 mg FCM is a safe, efficacious and cost-effective treatment for PPA in India.

  7. Electronic structure of ferromagnet-insulator interfaces: Fe/MgO and Co/MgO

    Mueller, M.


    In this thesis the electronic structure of Fe/MgO{sub x} and Co/MgO{sub x} ferromagnet-insulator interfaces, representing material systems which are widely used in magnetic tunnel junctions, is studied by means of spin- and angle-resolved photoemission spectroscopy. The photoemission studies focus particularly on the response of the ferromagnetic electronic system in contact with MgO of varying stoichiometries, as this reflects the mechanisms of metal-oxide bonding at real ferromagnet-insulator interfaces. The correlation between chemical bonding and electronic structure formation is analyzed by combining information from core- and valence-band photoemission spectroscopy. The spectral features are compared to band structure calculations, which are performed using the SPR-KKR method. The Fe/MgO and Co/MgO systems are prepared by molecular beam epitaxy under ultrahigh vacuum conditions on well-defined (4 x 6) GaAs(001) substrates. A structural analysis by means of low-energy electron diffraction (LEED) reveals their body-centered cubic crystalline structure, whereas the chemical characterization by Auger electron spectroscopy is used to quantify the chemical environment at the sample surfaces. The magnetic analysis, using the magneto-optical Kerr effect, reveals the uniaxial anisotropy of the ferromagnetic layers. A crucial parameter is given by the MgO degree of oxidation, which is addressed by means of core-level spectroscopy and quantified by suitable fitting procedures of the Mg 2p core level. The results of the photoemission experiments show, that the electronic structure of the Fe/MgO and Co/MgO ferromagnet/insulator interfaces and, consequently, the interfacial spin polarization are sensitively controlled by the interface chemistry. In particular, three distinct scenarios are identified: the nearly stoichiometric, the oxygen-deficient and the over-oxidized ferromagnet/MgO interface. Each case is defined by innate characteristics of the electronic structure at

  8. FeII/MgII, [Fe/Mg] Ratios and High-z Quasars

    Korista, K; Corbin, M R; Freudling, W; Korista, Kirk; Kodituwakku, Nalaka; Corbin, Michael; Freudling, Wolfram


    It has been suggested in the literature that the (Fe/alpha) abundance ratio may be used as a chronometer, due to a delay in this ratio reaching its solar value as predicted by galactic chemical evolution models. Using grids of photoionization models along a sequence of the (Fe/Mg) abundance ratio vs.\\ metallicity with time in a giant elliptical starburst scenario, we investigate the relationship between the (Fe/Mg) abundance ratio and the FeII/MgII emission line flux ratio under the assumption that these lines originate in photoionized clouds within the broad emission line regions of quasars.

  9. Prospective, randomised trial of the time dependent antiplatelet effects of 500 mg and 250 mg acetylsalicylic acid i. v. and 300 mg p. o. in ACS (ACUTE).

    Zeymer, Uwe; Hohlfeld, Thomas; Vom Dahl, Jürgen; Erbel, Raimund; Münzel, Thomas; Zahn, Ralf; Roitenberg, Alexander; Breitenstein, Stefanie; Pap, Ákos Ferenc; Trenk, Dietmar


    Little is known about the onset of action after intravenous or oral administration of acetylsalicylic acid (ASA) in patients with acute coronary syndromes (ACS). The aim of the study was to compare intravenous 250 or 500 mg acetylsalicylic acid (ASA) with oral 300 mg in ASA naïve patients with ACS concerning the onset of antiplatelet effects measured by time dependent thromboxane inhibition. A total of 270 patients with ACS acid (AA)-induced platelet thromboxane release (TXB2) 5 minutes (min) after study drug administration. Both 250 mg and 500 mg ASA i. v. inhibited TXB2 formation nearly completely (geometric means: from 581.7 and 573.9 ng/ml at baseline to 3.9 and 3.1 ng/ml at 5 min, respectively) compared to 300 mg oral ASA (geometric means: from 652.0 to 223.7 ng/ml) (p-value, ANCOVA: < 0.0001). Similar results were obtained for inhibition of AA-induced platelet aggregation (Multiplate ASPItest; from means 86.41 and 85.72 U to 23.04 and 20.57 U at 5 min, respectively) compared to 300 mg oral ASA from mean 87.18 to 75.56 U (p-value, ANCOVA: <0.0001). The rate of bleedings was low and comparable between the groups. In summary, the administration of a single dose of 250 or 500 mg ASA IV compared to 300 mg orally is associated with a faster and more complete inhibition of thromboxane generation and platelet aggregation. Bleeding complications were comparable between the groups.




    Full Text Available AIMS AND OBJECTIVES To Compare the Safety and Efficacy of Rosuvastatin (10 Mg and Atorvastatin (20 Mg in Cases of Dyslipidaemia Over Six Weeks of Treatment. MATERIALS AND METHODS Inclusion Criteria: Both male and female (Excluding Pregnancy above 18 years of age with hypercholesterolaemia, having LDL-C concentration of >159 and, 259 mg/dL and triglyceride concentration of <400 mg/dL, who had failed to have achieved LDL-C goals laid down by the NECP ATP-III guidelines after therapeutic lifestyle change (TLC: HDL-C level: <40 mg/dL for men and, <50 mg/dL for women. 60 cases of dyslipidaemia were selected and 30 were treated with rosuvastatin 10 mg (Study group ‘A’ and 30 of them were treated with atorvastatin 20 mg (study group ‘B’. Exclusion Criteria 1. Use of lipid lowering agents within the past 6 months. 2. Any history of known familial hypercholesterolaemia. 3. Any history of serious or hypersensitivity reactions to other statins. 4. Uncontrolled hypothyroidism; uncontrolled hypertension. 5. Acute liver diseases or hepatic dysfunction. After estimation of total cholesterol, triglycerides, HDL- cholesterol and LDL-c in a basal state, 30 patients were put on rosuvastatin 10 mg and 30 patients were put on atorvastatin 20 mg daily after night meals. After taking drugs, lipid fractions were re-estimated at the end of 4 weeks and 6 weeks. Clinical examination and questions about occurrence of side effects were carried out at interval of 2 weeks. Present study was conducted in the Department of Medicine and Pathology, of Katihar Medical College, Katihar, B. N. Mandal University, Madhepura; Bihar. Approval of the Institutional Ethical Committee was taken. Study conducted by “Keith C et al (2006” showed 37.1±1.3%, improvement in patients treated with RSV (10 and 38.5±1%, with (ATV 20, (ARIES TRIAL, “Cheng J. W. et al (2004” found 43% improvement in levels of LDL-C, with RSV (10 and “Herregod et al (2008” found that RSV (10

  11. A comparison of roxatidine acetate 150 mg once daily and 75 mg twice daily in duodenal ulcer healing.

    Hentschel, E; Schütze, K


    A randomised multicentre, double-blind study of the efficacy and safety of roxatidine acetate 150 mg at bedtime or 75 mg twice a day was conducted in 300 outpatients with endoscopically confirmed duodenal ulcers. After 14 days' treatment with roxatidine acetate substantial reductions in ulcer sizes had been obtained, in addition to healing rates of 87 to 89%, with no significant differences between the dosage regimens. There were graded reductions in day and night-time assessment of epigastric pain for both treatment groups and no differences in the mean numbers of antacid tablets consumed. In addition, cigarette smoking did not influence the healing rates produced by either treatment schedule. 11 patients reported 12 mild adverse reactions, with gastrointestinal symptoms the most frequent, and no clinically significant alterations in laboratory values. The present data suggests that a single bedtime dose of roxatidine acetate 150 mg produces effective duodenal ulcer healing and pain relief equivalent to that produced by a twice daily dosage regimen.

  12. From mapping class groups to automorphism groups of free groups

    Wahl, Nathalie


    We show that the natural map from the mapping class groups of surfaces to the automorphism groups of free groups, induces an infinite loop map on the classifying spaces of the stable groups after plus construction. The proof uses automorphisms of free groups with boundaries which play the role...... of mapping class groups of surfaces with several boundary components....

  13. A first-principles study of the thermodynamic and electronic properties of Mg and MgH2 nanowires.

    Wu, Xinxing; Zhang, Ruiqi; Yang, Jinlong


    In this article, we studied the thermodynamic and electronic properties of Mg and MgH2 nanowires with different diameters, and elucidated why MgH2 nanowires are good hydrogen storage materials through first-principles calculations. Previous experiments have shown that the orientation relationship between Mg and MgH2 nanowires is the Mg[0001] direction parallel to the MgH2[110] direction. In our calculations, Mg nanowires oriented along the [0001] direction and MgH2 nanowires oriented along the [110] direction were built from bulk Mg and MgH2 crystals, respectively. We found that as the diameters of Mg and MgH2 nanowires decrease, Mg and MgH2 nanowires become more unstable, and the hydrogen desorption energies and temperatures of MgH2 nanowires decrease. That is, the thinner the MgH2 nanowires get, the more dramatically hydrogen desorption temperatures (Td) will decrease. Meanwhile, we also found that when the diameters of MgH2 nanowires are larger than 1.94 nm, the Td almost maintain the same value at about 440 K, only about 40 K lower than that of bulk MgH2 crystal; if the diameters are less than 1.94 nm, the Td reduce very quickly. In particular, compared with bulk MgH2 crystal, the Td of the thinnest MgH2 nanowire with a diameter of 0.63 nm can be reduced by 164 K. In addition, the electronic structure calculations showed that Mg nanowires are metals, while MgH2 nanowires are semiconductors. In particular, our results showed that the electronic structures of MgH2 nanowires are influenced by the surface effect and quantum size effect. That is to say, the band gaps of MgH2 nanowires are controlled by surface electronic states and the size of MgH2 nanowires.

  14. Ropivacaine 7.5 mg/mL for Caesarean Section

    N. K. Nguyen


    Full Text Available Background. Pain after Caesarean delivery is partly related to Pfannenstiel incision, which can be infiltrated with local anaesthetic solutions. Methods. A double- blind randomized control trial was designed to assess the analgesic efficacy of 7.5 mg/mL ropivacaine solution compared to control group, in two groups of one hundred and forty four parturients for each group, who underwent Caesarean section under spinal anaesthesia: group R (ropivacaine group and group C (control group. All parturients also received spinal sufentanil (2.5 g. Results. Ropivacaine infiltration in the Pfannenstiel incision for Caesarean delivery before wound closure leads to a reduction of 30% in the overall consumption of analgesics (348 550 mg for group R versus 504 426 mg for group C with <.05, especially opioids in the first 24 hours, but also significantly increases the time interval until the first request for an analgesic (4 h 20 min ± 2 h 26 for group R versus 2 h 42 ± 1 h 30 for group C. The P values for the two groups were: <.0001 for paracetamol, <.0001 for ketoprofen and P for nalbuphine which was the most significant. There is no significant difference in the threshold of VAS in the two series. Conclusion. This technique can contribute towards a programme of early rehabilitation in sectioned mothers, with earlier discharge from the post-labour suite.

  15. Microstructural evolution of Mg-7Al-2Sn Mg alloy during multi-directional impact forging

    M.G. Jiang


    Full Text Available Multi-directional impact forging (MDIF was applied to a Mg-7Al-2Sn (wt.% Mg alloy to investigate its effect on the microstructural evolution. MDIF process exhibited high grain refinement efficiency. After MDIF 200 passes, the grain size drastically decreased to 20 µm from the initial coarse grains of ~500 µm due to dynamic recrystallization (DRX. Meanwhile, original grain boundaries remained during MDIF and large numbers of fine spherical β-Mg17Al12 particles dynamically precipitated along the original grain boundaries with high Al concentration, acting as effective pinning obstacles for the suppression of DRXed grain growth. Besides, micro-cracks nucleated during MDIF and propagated along the interface between the remained globular or cubic Al-Mn particles and Mg matrix.

  16. Proton resonance elastic scattering of $^{30}$Mg for single particle structure of $^{31}$Mg

    The single particle structure of $^{31}$Mg, which is located in the so-called “island of inversion”, will be studied through measuring Isobaric Analog Resonances (IARs) of bound states of $^{31}$Mg. They are located in the high excitation energy of $^{31}$Al. We are going to determine the spectroscopic factors and angular momenta of the parent states by measuring the excitation function of the proton resonance elastic scattering around 0 degrees in the laboratory frame with around 3 MeV/nucleon $^{30}$Mg beam. The present study will reveal the shell evolution around $^{32}$Mg. In addition, the spectroscopic factor of the (7/2)$^{−}$ state which was not yet determined experimentally, may allow one to study the shape coexistence in this nucleus.

  17. Effect of organic ligands on Mg partitioning and Mg isotope fractionation during low-temperature precipitation of calcite in the absence of growth rate effects

    Mavromatis, Vasileios; Immenhauser, Adrian; Buhl, Dieter; Purgstaller, Bettina; Baldermann, Andre; Dietzel, Martin


    Calcite growth rate has been previously shown to be the dominating parameter controlling both Mg partitioning and Mg isotope fractionation during calcite growth. In natural calcite precipitation environments - characterized by abundant organic material - the presence of dissolved organic molecules may affect these two parameters. In order to assess the role of organic molecules, steady state calcite growth experiments have been performed at 25 °C, 1 bar pCO2 and constant, within analytical uncertainty growth rate (rp = 10-7.4 mol m-2 s-1) in the presence of aqueous Mg and six organic ligands in the concentration range from 0.01 to 10 mM. The organic ligands used in this study are: (i) acetic acid, (ii) citric acid, (iii) glutamic acid, (iv) salycilic acid, (v) glycine, and (vi) ethylenediaminetetraacetic acid (EDTA). These contain one or more carboxyl- and amino-groups that are commonly present in natural organic substances found in lacustrine, fluvial, soil, cave, as well as in marine and earliest diagenetic porewater environments. Results shown here indicate that the presence of these carboxyl- and amino-groups promotes an increase in the partition coefficient of Mg in calcite (DMg = (Mg/Ca)calcite/(Mg/Ca)fluid) that can be attributed to their adsorption onto the calcite surfaces and the subsequent reduction of the active sites of growth. This increase of DMg values as a function of the supersaturation degree of calcite in the fluid phase can be described by the linear equation:

  18. Thermodynamic Property Study of Nanostructured Mg-H, Mg-Ni-H, and Mg-Cu-H Systems by High Pressure DSC Method

    Huaiyu Shao


    Full Text Available Mg, Ni, and Cu nanoparticles were synthesized by hydrogen plasma metal reaction method. Preparation of Mg2Ni and Mg2Cu alloys from these Mg, Ni, and Cu nanoparticles has been successfully achieved in convenient conditions. High pressure differential scanning calorimetry (DSC technique in hydrogen atmosphere was applied to study the synthesis and thermodynamic properties of the hydrogen absorption/desorption processes of nanostructured Mg-H, Mg-Ni-H, and Mg-Cu-H systems. Van’t Hoff equation of Mg-Ni-H system as well as formation enthalpy and entropy of Mg2NiH4 was obtained by high pressure DSC method. The results agree with the ones by pressure-composition isotherm (PCT methods in our previous work and the ones in literature.

  19. Porous Ceramic Composite ZrO2(MgO)-MgO for Osteoimplantology

    Buyakov, A. S.; Kulkov, S. N.


    Pore and crystalline structure, biocompatibility of ceramic composite ZrO2(MgO)-MgO were studied. The main mechanical characteristics were determined and it has been shown that compression strength directly depends on microstresses obtained from X-ray data. In-vitro studies of mesenchymal stromal stem cells (MMSC), cultivated on material surface are shown that cell proliferation and differentiation of MMSC goes throw osteogenic type.

  20. Flunarizine in migraine prophylaxis: efficacy and tolerability of 5 mg and 10 mg dose levels.

    Centonze, V; Magrone, D; Vino, M; Caporaletti, P; Attolini, E; Campanale, G; Albano, O


    The use of flunarizine, a drug which has proven its efficacy in migraine, is often associated with important side effects. The aim of this paper has been to check their incidence at different dose levels (5 mg vs 10 mg). Our data confirm the occurrence of important side effects (in particular weight gain); on the other hand, they emphasize the dose-dependency of the side effects.

  1. 9Mg(OH)(2)·MgCl(2)·4H(2)O, a high temperature phase of the magnesia binder system.

    Dinnebier, Robert E; Freyer, Daniela; Bette, Sebastian; Oestreich, Melanie


    The metastable phase 9Mg(OH)(2)·MgCl(2)·4H(2)O (9-1-4 phase) was found at the extended metastable isotherm of Mg(OH)(2) in the system MgO-MgCl(2)-H(2)O at 120 °C and occurs as intermediate binder phase during setting of magnesia cement due to temperature development of the setting reaction. The crystal structure of the 9-1-4 phase was solved from high resolution laboratory X-ray powder diffraction data in space group I2/m (C2/m) (a = 22.2832(3) Å, b = 3.13501(4) Å, c = 8.1316(2) Å, β = 97.753(1)°, V = 562.86(2) Å(3), and Z = 1). Structural and characteristical relations of the phases in the system MgO-MgCl(2)-H(2)O can be derived, with which the development of the cement or concrete qualities becomes explainable.

  2. Comparison of Efficiencies and Mechanisms of Catalytic Ozonation of Recalcitrant Petroleum Refinery Wastewater by Ce, Mg, and Ce-Mg Oxides Loaded Al2O3

    Chunmao Chen


    Full Text Available The use of catalytic ozonation processes (COPs for the advanced treatment of recalcitrant petroleum refinery wastewater (RPRW is rapidly expanding. In this study, magnesium (Mg, cerium (Ce, and Mg-Ce oxide-loaded alumina (Al2O3 were developed as cost efficient catalysts for ozonation treatment of RPRW, having performance metrics that meet new discharge standards. Interactions between the metal oxides and the Al2O3 support influence the catalytic properties, as well as the efficiency and mechanism. Mg-Ce/Al2O3 (Mg-Ce/Al2O3-COP reduced the chemical oxygen demand by 4.7%, 4.1%, 6.0%, and 17.5% relative to Mg/Al2O3-COP, Ce/Al2O3-COP, Al2O3-COP, and single ozonation, respectively. The loaded composite metal oxides significantly increased the hydroxyl radical-mediated oxidation. Surface hydroxyl groups (–OHs are the dominant catalytic active sites on Al2O3. These active surface –OHs along with the deposited metal oxides (Mg2+ and/or Ce4+ increased the catalytic activity. The Mg-Ce/Al2O3 catalyst can be economically produced, has high efficiency, and is stable under acidic and alkaline conditions.

  3. Laser cooling of MgCl and MgBr in theoretical approach

    Wan, Mingjie; Shao, Juxiang; Huang, Duohui; Yang, Junsheng; Cao, Qilong; Jin, Chengguo; Wang, Fanhou, E-mail: [Computational Physics Key Laboratory of Sichuan Province, Yibin University, Yibin 644007 (China); Gao, Yufeng [Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065 (China)


    Ab initio calculations for three low-lying electronic states (X{sup 2}Σ{sup +}, A{sup 2}Π, and 2{sup 2}Π) of MgCl and MgBr molecules, including spin-orbit coupling, are performed using multi-reference configuration interaction plus Davidson correction method. The calculations involve all-electronic basis sets and Douglas–Kroll scalar relativistic correction. Spectroscopic parameters well agree with available theoretical and experimental data. Highly diagonally distributed Franck-Condon factors f{sub 00} for A{sup 2}Π{sub 3/2,1/2} (υ′ = 0) → X{sup 2}Σ{sup +}{sub 1/2} (υ″ = 0) are determined for both MgCl and MgBr molecules. Suitable radiative lifetimes τ of A{sup 2}Π{sub 3/2,1/2} (υ′ = 0) states for rapid laser cooling are also obtained. The proposed laser drives A{sup 2}Π{sub 3/2} (υ′ = 0) → X{sup 2}Σ{sup +}{sub 1/2} (υ″ = 0) transition by using three wavelengths (main pump laser λ{sub 00}; two repumping lasers λ{sub 10} and λ{sub 21}). These results indicate the probability of laser cooling MgCl and MgBr molecules.

  4. Fabrication of all-MgB Josephson junctions using MgO insulator layer

    Oba, T. [Graduate School of Engineering, Iwate University, 4-3-5, Ueda, Morioka 020-8551 (Japan); Goto, S. [Lightom, 95-2 Sugo, Takizawa 020-0173 (Japan); Sasaki, S.; Nakanishi, Y.; Fujino, T. [Graduate School of Engineering, Iwate University, 4-3-5, Ueda, Morioka 020-8551 (Japan); Harada, Y. [JST Satellite Iwate, Japan Science and Technology Agency, 3-35-2 Iiokashinden, Morioka, Iwate 020-0852 (Japan); Nakamura, M. [Graduate School of Engineering, Iwate University, 4-3-5, Ueda, Morioka 020-8551 (Japan); Saito, A. [Department of Electrical Engineering, Yamagata University, 4-3-16, Jonan, Yonezawa, Yamagata 992-8510 (Japan); Yoshizawa, M. [Graduate School of Engineering, Iwate University, 4-3-5, Ueda, Morioka 020-8551 (Japan)], E-mail:


    We report on the fabrication and properties of all-MgB{sub 2} tunnel junctions with an MgO barrier. Superconductor-insulator-superconductor (SIS) junctions were fabricated on C-plane sapphire substrates. MgB{sub 2} films were grown in an ultra-high vacuum in the 10{sup -9} Torr range. The MgO insulating layer was evaporated using an electron-beam gun. SIS junctions of 30 {mu}m in diameter were fabricated by standard photolithography and Ar ion milling techniques. The critical temperature (T{sub C}) of the lower MgB{sub 2} layer after the SIS junction fabrication process was 36.7 K, which remained the same as that of the bare MgB{sub 2} film. We observed tunneling behavior in the current-voltage (I-V) characteristics of the present junctions. A superconducting gap was clearly observed at around 2.7 mV (=2{delta})

  5. Preference for rizatriptan 10-mg wafer vs. eletriptan 40-mg tablet for acute treatment of migraine.

    Láinez, M J A; Evers, S; Kinge, E; Allais, G; Allen, C; Rao, N A; Massaad, R; Lis, K


    Preference is a composite, patient-oriented endpoint incorporating efficacy, tolerability, formulation, and convenience of medications. The objective of this study was to compare patient preference for rizatriptan 10-mg wafer vs. eletriptan 40-mg tablet for acute treatment of migraine. In this multicentre, open-label, two-period, crossover study, out-patients were randomly assigned to treat the first of two moderate to severe migraines with rizatriptan or eletriptan and the second with the alternate therapy. Patients completed diary assessments at baseline and up to 24 h after taking study medication. At the last visit, patients completed a psychometrically validated preference questionnaire. A total of 372 patients (mean age 38 years, 85% female) treated two migraine attacks, and 342 patients (92%) expressed a preference for treatment. Significantly more (P rizatriptan 10-mg wafer [61.1%; 95% confidence interval (CI) 55.7, 66.3] to eletriptan 40-mg tablet (38.9%; 95% CI 33.7, 44.3). The most common reason given for preference of either treatment was speed of headache relief. At 2 h, 80% and 69% of patients reported that rizatriptan and eletriptan, respectively, was convenient or very convenient to take (mean convenience score 1.99 vs. 2.31, respectively; P rizatriptan 10-mg wafer to the eletriptan 40-mg tablet for acute treatment of migraine. The single most important reason for preference was speed of relief, consistent with results from previous preference studies.

  6. Laser cooling of MgCl and MgBr in theoretical approach.

    Wan, Mingjie; Shao, Juxiang; Gao, Yufeng; Huang, Duohui; Yang, Junsheng; Cao, Qilong; Jin, Chengguo; Wang, Fanhou


    Ab initio calculations for three low-lying electronic states (X(2)Σ(+), A(2)Π, and 2(2)Π) of MgCl and MgBr molecules, including spin-orbit coupling, are performed using multi-reference configuration interaction plus Davidson correction method. The calculations involve all-electronic basis sets and Douglas-Kroll scalar relativistic correction. Spectroscopic parameters well agree with available theoretical and experimental data. Highly diagonally distributed Franck-Condon factors f00 for A(2)Π3/2,1/2 (υ' = 0) → X(2)Σ(+) 1/2 (υ″ = 0) are determined for both MgCl and MgBr molecules. Suitable radiative lifetimes τ of A(2)Π3/2,1/2 (υ' = 0) states for rapid laser cooling are also obtained. The proposed laser drives A(2)Π3/2 (υ' = 0) → X(2)Σ(+) 1/2 (υ″ = 0) transition by using three wavelengths (main pump laser λ00; two repumping lasers λ10 and λ21). These results indicate the probability of laser cooling MgCl and MgBr molecules.

  7. Dehydrogenation kinetics of air-exposed MgH2/Mg2Cu and MgH2/MgCu2 studied with in situ X-ray powder diffraction

    Andreasen, A.; Sørensen, M.B.; Burkarl, R.


    The dehydrogenation kinetics of air exposed samples of MgH2/Mg2Cu and MgH2/MgCu2 have been studied with in situ time resolved X-ray powder diffraction. The X-ray setup enabled the recording of full diffraction patterns within 150 s, thereby allowing the study of structural changes combined...... sample was found to be 108 kJ/mol and 160 kJ/mol, respectively. Furthermore, substantially improved dehydrogenation kinetics of MgH2 and resistance towards oxidation of Mg due to the presence of Mg2Cu/MgCu2 are discussed in relation to previous work....

  8. Two Proton Knockout from ^32Mg

    Fallon, P.; Rodriguez-Vieitez, E.; Macchiavelli, A. O.; Clark, R. M.; Lee, I.-Y.; Wiedeking, M.; Gade, A.; Adrich, P.; Bazin, D.; Bowen, M.; Campbell, C. M.; Cook, J. M.; Dinca, D. C.; Glasmacher, T.; McDaniel, S.; Mueller, W. F.; Ratiewicz, A. F.; Siwek, K.; Terry, J. R.; Wiesshaar, D.; Yoneda, K.; Brown, B. A.; Otsuka, T.; Tostevin, J. A.; Utsuno, Y.


    We present data and calculations on the near-dripline nucleus ^30Ne. Gamma-ray decays from excited states as well as inclusive and exclusive cross-sections were measured in the ^9Be(^32Mg,^30Ne γ)X two-proton knockout reaction at incident beam energies of 99.7 and 86.7 MeV/A. The measured inclusive cross section sigma = 0.22(4)mb is suppressed compared to calculation and is indicative of a reduced overlap of initial and final state wavefunctions. We interpret this reduction as a result of large 4p4h intruder components present in ^30Ne, but not ^32Mg. Large 4p4h amplitudes are predicted to generate increased T=1 paring strengths and to help stabilize the heavier fluorine isotopes against neutron decay. A new gamma-ray transition at 1443 keV is assigned to the decay of the 4^+ state based on the spin dependent sigma for 2 proton knockout from the (d5/2)^4 configuration.

  9. Enhancing mechanical properties of calcite by Mg substitutions: An ab initio study

    Elstnerova, Pavlina; Friak, Martin; Hickel, Tilmann; Fabritius, Helge Otto; Lymperakis, Liverios; Petrov, Michal; Raabe, Dierk; Neugebauer, Joerg; Nikolov, Svetoslav; Zigler, Andreas; Hild, Sabine


    Arthropoda representing a majority of all known animal species are protected by an exoskeleton formed by their cuticle. The cuticle represents a hierarchically structured multifunctional bio-composite based on chitin and proteins. Some groups like Crustacea reinforce the load-bearing parts of their cuticle with calcite. As the calcite sometimes contains Mg it was speculated that Mg may have a stiffening impact on the mechanical properties of the cuticle. We present a theoretical parameter-free quantum-mechanical study of thermodynamic, structural and elastic properties of Mg-substituted calcite. Our results show that substituting Ca by Mg causes an almost linear decrease in the crystal volume with Mg concentration and of substituted crystals. As a consequence the calcite crystals become stiffer giving rise e.g. to substantially increased bulk moduli.

  10. Mg/Si Mineralogical Ratio of Low-Mass Planet Hosts. Correction for the NLTE Effects

    Adibekyan, V.; Gonçalves da Silva, H. M.; Sousa, S. G.; Santos, N. C.; Delgado Mena, E.; Hakobyan, A. A.


    Mg/Si and Fe/Si ratios are important parameters that control the composition of rocky planets. In this work we applied non-LTE correction to the Mg and Si abundances of stars with and without planets to confirm/reject our previous findings that [Mg/Si] atmospheric abundance is systematically higher for Super-Earth/Neptune-mass planet hosts than stars without planets. Our results show that the small differences of stellar parameters observed in these two groups of stars are not responsible for the already reported difference in the [Mg/Si] ratio. Thus, the high [Mg/Si] ratio of Neptunian hosts is probably related to the formation efficiency of these planets in such environments.

  11. Materials science of Mg-Ni-based new hydrides

    Orimo, S.; Fujii, H. [Hiroshima Univ. (Japan). Faculty of Integrated Arts and Sciences


    One of the advantageous functional properties of Mg alloys (or compounds) is to exhibit the reversible hydriding reaction. In this paper, we present our systematic studies regarding the relationship between nanometer- or atomistic-scale structures and the specific hydriding properties of the Mg-Ni binary system, such as(1) nanostructured (n)-Mg{sub 2}Ni, (2) a mixture of n-Mg{sub 2}Ni and amorphous (a)-MgNi,(3) pure a-MgNi, and(4) n-MgNi{sub 2}. Further studies on(5) an a-MgNi-based system for clarifying the effect of the short-range ordering on the structural and hydriding properties and(6) a MgNi{sub 2}-based system for synthesizing the new Laves phase structure are also presented. The materials science of Mg-Ni-based new hydrides will provide indispensable knowledge for practically developing the Mg alloys as hydrogen-storage materials. (orig.)

  12. Factors Influencing MgO Content of RE-Mg Nodularizing Alloy%REMg球化剂中MgO含量的影响因素

    杨宇鹏; 肖勇


    The effect of Mg in nodularizing alloy was introduced.When the total content of Mg was constant,the formation of MgO reduced the content of the effective Mg that would influence the nodularizing capability of the nodualrizing alloy.The source of MgO in nodularizing alloy was analyzed as follows:the MgO formed during the melting process of the nodularizing alloy and the MgO formed during the analysis sample preparing process.It was pointed out after analyzing two cases:(1) the MgO content of nodularizing alloy is the main factor influencing its nodularzing capability,therefore the MgO content should be reduced by improving its melting process; (2)In order to ensure the veracity of MgO content test it's necessary to use correct sample preparing method.%介绍了Mg在球化剂中的作用.当w(Mg总)一定时,MgO的生成降低了w(Mg有效)的含量,影响到球化剂的球化能力.分析了球化剂中MgO的来源:球化剂熔炼过程中产生MgO、在制取分析样品过程中产生MgO.通过2个案例的分析,指出:(1)球化剂中MgO含量的高低是影响其球化能力的主要因素,应通过改进熔炼工艺来降低w(MgO)量;(2)为确保球化剂中w(MgO)量检测的准确性,应采用正确的样品制备方法.

  13. Thermochemistry of MgCr2O4, MgAl2O4, MgFe2O4 spinels in SO2-O2-SO3 atmosphere

    Anna Gerle


    Full Text Available The present paper investigates high-temperature sulphate corrosion of basic refractory ceramics containing magnesium spinels (MgAl2O4, MgFe2O4, MgCr2O4 and their solid solutions widely used in metallurgy, chemical, ceramic and glass industry. This group of refractories are exposed to a number of destructive factors during a working campaign. One of such factors is gas corrosion caused by sulphur oxides. However, gas sulphate corrosion of basic refractory materials containing magnesium spinels, which has a great practical meaning for the corrosion resistance of the material main components, is not sufficiently examined. This work presents a thermodynamic analysis of (MgCr2O4, MgAl2O4, MgFe2O4−SO2−O2−SO3 system aimed to calculate: i the standard free enthalpy of chemical reactions, ii the equilibrium composition of the gas mixture initially containing SO2 and O2 and iii sulphates equilibrium dissociation pressure and equilibrium partial pressure for the reaction of SO3 with the spinels to predict the temperature range of corrosion products’ stability. A thermochemical calculation provides information about equilibrium state in the analysed system. In real conditions the state of equilibrium does not have to be achieved. For this reason, the results of calculations were compared with experimental data. The experiment results were consistent with the theoretical predictions.

  14. Effects of nifedipine GITS 20 mg or enalapril 20 mg on blood pressure and inflammatory markers in patients with mild-moderate hypertension.

    Agabiti Rosei, Enrico; Morelli, Patrizia; Rizzoni, Damiano


    Calcium antagonists, angiotensin-converting enzyme (ACE) inhibitors and other drug classes either alone or in combination have been recommended for the treatment of hypertension. Nifedipine gastrointestinal therapeutic system (GITS) 20 mg is a new low-dose formulation with an improved tolerability. The aim of the present study was to compare the effects of nifedipine GITS 20 mg and enalapril 20 mg on blood pressure and circulating adhesion molecules in hypertensive patients. This randomized, double-blind, multicentre trial compared the blood pressure lowering effects of a 12-week treatment of nifedipine GITS 20 mg vs enalapril 20 mg in 264 patients with mild-to-moderate hypertension. Nifedipine GITS 20 mg induced a reduction of clinic blood pressure, which was similar to that observed with enalapril 20 mg. Nifedipine GITS and enalapril lowered mean sitting diastolic blood pressure by 11.8 and 12.4 mmHg, respectively, while systolic blood pressure was reduced by 15.3 and 16.3 mmHg, respectively. Ambulatory blood pressure monitoring-derived blood pressure data showed similar results in both groups without any statistically significant differences between treatments. Both enalapril and nifedipine tended to reduce ICAM-1 and E-selectin, while only nifedipine reduced von Willebrand factor. Both treatments were well tolerated. Our findings demonstrate a similar antihypertensive effectiveness of a low dose (20 mg) of nifedipine GITS in comparison with a standard dose of enalapril (20 mg). Given its clinical efficacy and good tolerability, low-dose nifedipine GITS may be considered a valuable treatment option for hypertensive patients.

  15. Effect of Mg and C contents in MgCNi3, and structure and superconductivity of MgCNi3-xCox


    The effect of Mg and C contents on TC in MgCNi3, and structure and superconductivity of MgCNi3-xCox were studied. It is found that the excess of Mg and C in initial material mixture is favorable to improvement in TC and helps to obtain single_phase samples. For preparing MgCNi3 superconductor, the optimum composition of starting materials is MgC1.45Ni3 with excess of Mg (20 wt.%) of the stoichiometric composition. In MgCNi3-xCox system, a continuous solid solution is formed, lattice parameter decreases slightly and TC decreases obviously with increasing x. A suppression of superconductivity is observed due to the substitution of Co (Mn) for Ni. The suppression effect is smaller for the substitution of Co than that of Mn.

  16. Tuinbouw Integraal Digitaal (TID); Inventarisatie, analyse en programmavoorstel

    Verloop, C.M.; Verdouw, C.N.; Wolfert, J.; Beulens, A.J.M.; Dijkxhoorn, Y.; Snels, J.C.M.A.; Splinter, G.M.


    In dit rapport wordt de huidige situatie op het gebied van integrale digitale informatievoorziening in de tuinbouwsector in kaart gebracht en geanalyseerd. Vervolgens worden de contouren geschetst van een mogelijk programma voor verbetering en integratie van deze digitale informatievoorziening. Hier

  17. Tid og timing: Et metodisk perspektiv på produktionsanalyse

    Kirsten Frandsen


    Full Text Available In recent years, media production studies have grown into a thriving field of research, which has given rise to a discussion of the theoretical and methodological approaches it employs (Paterson et al., 2016; Frandsen, 2007; Bruun, 2010, 2016b. This article is a contribution to this development. The focal point is a discussion of how time and timing are important in media production research. The article points out that time is not just a matter of the amount of time that researchers have for their data collection. In production studies, the researcher constructs the object for analysis, and time is to be considered depending on the type of analytical object you are trying to create, on the temporality that is present in the production process behind specific genres and subject areas, and on the changes the media are undergoing. A particular aspect of time is timing, which has both a performative and a strategic dimension. The importance of time and timing will be illustrated with examples from our own and other researchers’ projects.

  18. Salmonella typhi--tid til aendring af den empiriske behandling

    Gade, Christina; Engberg, Jørgen; Weis, Nina


    In the present case series report we describe seven recent cases of typhoid fever. All the patients were travellers returning from Pakistan, where typhoid is endemic. Salmonella typhi isolated from the patients by blood culture were reported as intermediary susceptible to fluoroquinolones in six...... out of seven cases. We recommend that empiric treatment of suspected cases of typhoid fever includes a third generation cephalosporin such as ceftriaxon. Furthermore, the present report stresses the importance of typhoid vaccination of travellers to areas where typhoid is endemic. Udgivelsesdato: 2008...

  19. Salmonella typhi--tid til aendring af den empiriske behandling

    Gade, Christina; Engberg, Jørgen; Weis, Nina


    In the present case series report we describe seven recent cases of typhoid fever. All the patients were travellers returning from Pakistan, where typhoid is endemic. Salmonella typhi isolated from the patients by blood culture were reported as intermediary susceptible to fluoroquinolones in six...

  20. Storm induced large scale TIDs observed in GPS derived TEC

    C. Borries


    Full Text Available This work is a first statistical analysis of large scale traveling ionospheric disturbances (LSTID in Europe using total electron content (TEC data derived from GNSS measurements. The GNSS receiver network in Europe is dense enough to map the ionospheric perturbation TEC with high horizontal resolution. The derived perturbation TEC maps are analysed studying the effect of space weather events on the ionosphere over Europe.

    Equatorward propagating storm induced wave packets have been identified during several geomagnetic storms. Characteristic parameters such as velocity, wavelength and direction were estimated from the perturbation TEC maps. Showing a mean wavelength of 2000 km, a mean period of 59 min and a phase speed of 684 ms−1 in average, the perturbations are allocated to LSTID. The comparison to LSTID observed over Japan shows an equal wavelength but a considerably faster phase speed. This might be attributed to the differences in the distance to the auroral region or inclination/declination of the geomagnetic field lines.

    The observed correlation between the LSTID amplitudes and the Auroral Electrojet (AE indicates that most of the wave like perturbations are exited by Joule heating. Particle precipitation effects could not be separated.

  1. Uudised : Rubik 3001. Akordionipätid ja muu folk


    Koostöös Erkki Tero ja Tristan Priimäega annab artistinime Rubik 3001 kandev Janek Murd 10. märtsil välja esimese singli "Miru mir" mais-juunis ilmuvalt uuelt albumilt (kolme looga singel ilmub värskel Raadio Kosmos netileheküljel Aprillis ilmub ka kolme looga singel "My Mind Is Going". Üritusest sarjast MAAjaILM 11. märtsil Tartu Vanemuises

  2. Lads i senmoderne felle? Skolemotstand i individualiseringens tid

    Lena Marie Johansen


    Full Text Available Artikkelen diskuterer skoletilpasning og fremtidsorientering hos elever i et klasseperspektiv, med utgangspunkt i en etnografisk studie av arbeiderklasseungdom ved en bygg- og anleggslinje og middelklasseungdom ved en medie- og kommunikasjonslinje. Vi viser at det som på ett nivå fremstår som en felles oppslutning om skolens betydning og en felles tro på det senmoderne samfunnets mange muligheter, har svært ulik mening og får ulike implikasjoner for bygg- og anleggselevene og medie- og kommunikasjonselevene. For middelklasseelevenes del ser fortellingen ut til å stimulere drømmer om egen fremtid på måter som kan bidra til økt lærelyst. For arbeiderklasseelevene ser fortellingen derimot ut til å forsterke en frakopling mellom selvfortolkning og faktiske muligheter.

  3. Electrochemical formation of Mg-Li-Ca alloys by codeposition of Mg, Li and Ca from LiCl-KCl-MgCl2-CaCl2 melts.

    Yan, Yong De; Zhang, Mi Lin; Xue, Yun; Han, Wei; Cao, Dian Xue; Jing, Xiao Yan; He, Li Yi; Yuan, Yi


    This work presents electrochemical formation of Mg-Li-Ca alloys via codeposition of Mg, Li and Ca on a molybdenum electrode in KCl-LiCl-MgCl(2)-CaCl(2) melts at 943 K. Cyclic voltammograms (CVs) showed that the underpotential deposition (UPD) of calcium on pre-deposited magnesium leads to the formation of a liquid Mg-Ca alloy, and the succeeding underpotential deposition of lithium on pre-deposited Mg-Ca alloy leads to the formation of a liquid Mg-Li-Ca solution. Chronopotentiometric measurements indicated that the codepositon of Mg, Li and Ca occurs at current densities more negative than -0.31 A cm(-2) in LiCl-KCl-MgCl(2) (5 wt%) melts containing 1 wt% CaCl(2). Chronoamperograms demonstrated that the onset potential for the codeposition of Mg, Li and Ca is -2.200 V, and the codeposition of Mg, Li and Ca is formed when the applied potentials are more negative than -2.200 V. X-Ray diffraction (XRD) indicated that Mg-Li-Ca alloys with different phases were formed via galvanostatic electrolysis. The microstructures of typical alpha and beta phases of Mg-Li-Ca alloys were characterized by optical microscope (OM) and scanning electron microscopy (SEM). The analysis of energy dispersive spectrometry (EDS) showed that the element Ca mainly distributes along grain boundary in Mg-Li-Ca alloys. The results of inductively coupled plasma analysis determined that the chemical compositions of Mg-Li-Ca alloys correspond with the phase structures of XRD patterns, and the lithium and calcium contents of Mg-Li-Ca alloys depend on the concentrations of MgCl(2) and CaCl(2).

  4. Decay of a narrow and high spin {sup 24}Mg + {sup 24}Mg resonance

    Salsac, M.-D. [IPHC, Universite Louis Pasteur, CNRS-IN2P3, Strasbourg (France)], E-mail:; Haas, F.; Courtin, S. [IPHC, Universite Louis Pasteur, CNRS-IN2P3, Strasbourg (France); Algora, A. [INR, Debrecen (Hungary); Beck, C. [IPHC, Universite Louis Pasteur, CNRS-IN2P3, Strasbourg (France); Beghini, S. [Universita di Padova and INFN, Padova (Italy); Behera, B.R. [INFN Laboratori Nazionali di Legnaro, Legnaro (Italy); Chapman, R. [University of the West of Scotland, Paisley (United Kingdom); Corradi, L. [INFN Laboratori Nazionali di Legnaro, Legnaro (Italy); Dombradi, Z. [INR, Debrecen (Hungary); Farnea, E. [Universita di Padova and INFN, Padova (Italy); Fioretto, E.; Gadea, A. [INFN Laboratori Nazionali di Legnaro, Legnaro (Italy); Jenkins, D.G. [University of York, York (United Kingdom); Latina, A. [INFN Laboratori Nazionali di Legnaro, Legnaro (Italy); Lebhertz, D. [IPHC, Universite Louis Pasteur, CNRS-IN2P3, Strasbourg (France); Lenzi, S. [Universita di Padova and INFN, Padova (Italy); Liang, X. [University of the West of Scotland, Paisley (United Kingdom); Marginean, N. [INFN Laboratori Nazionali di Legnaro, Legnaro (Italy); Montagnoli, G. [Universita di Padova and INFN, Padova (Italy)] (and others)


    The {sup 24}Mg + {sup 24}Mg reaction has been studied at the Legnaro Tandem at a CM bombarding energy of 45.7 MeV where a narrow and high spin resonance has been reported previously. The decay of the resonance into the inelastic and fusion-evaporation channels has been investigated. The ON and OFF resonance decay yields have been measured using, for the inelastic channels, the fragment spectrometer PRISMA and the {gamma} array CLARA, and, for the fusion-evaporation channels, the Si array EUCLIDES and the {gamma} array GASP. Strong resonant effects have been observed in the inelastic channels involving the 2{sub 1}{sup +} and 4{sub 1}{sup +} states of the {sup 24}Mg ground state band. Weaker effects are also seen in certain fusion-evaporation channels. The properties of the studied resonance are in agreement with molecular model predictions. It is also proposed that the narrow and high spin {sup 24}Mg + {sup 24}Mg resonance corresponds to the formation of a fast rotating and highly prolate deformed {sup 48}Cr after a Jacobi shape transition and just before fission.

  5. Mechanical Properties of Mg-Gd and Mg-Y Solid Solutions

    Kula, Anna; Jia, Xiaohui; Mishra, Raj K.; Niewczas, Marek


    The mechanical properties of Mg-Gd and Mg-Y solid solutions have been studied under uniaxial tension and compression between 4 K and 298 K (-269 °C and 25 °C). The results reveal that Mg-Gd alloys exhibit higher strength and ductility under tension and compression attributed to the more effective solid solution strengthening and grain-boundary strengthening effects. Profuse twinning has been observed under compression, resulting in a material texture with strong dominance of basal component parallel to compression axis. Under tension, twining is less active and the texture evolution is controlled mostly by slip. The alloys exhibit pronounced yield stress asymmetry and significantly different work-hardening behavior under tension and compression. Increasing of Gd and/or Y concentration leads to the reduction of the tension-compression asymmetry due to the weakening of the recrystallization texture and more balanced twinning and slip activity during plastic deformation. The results suggest that under compression of Mg-Y alloys slip is more active than twinning in comparison to Mg-Gd alloys.

  6. Refinements in an Mg/MgH2/H2O-Based Hydrogen Generator

    Kindler, Andrew; Huang, Yuhong


    Some refinements have been conceived for a proposed apparatus that would generate hydrogen (for use in a fuel cell) by means of chemical reactions among magnesium, magnesium hydride, and steam. The refinements lie in tailoring spatial and temporal distributions of steam and liquid water so as to obtain greater overall energy-storage or energy-generation efficiency than would otherwise be possible. A description of the prior art is prerequisite to a meaningful description of the present refinements. The hydrogen-generating apparatus in question is one of two versions of what was called the "advanced hydrogen generator" in "Fuel-Cell Power Systems Incorporating Mg-Based H2 Generators" (NPO-43554), NASA Tech Briefs, Vol. 33, No. 1 (January 2009), page 52. To recapitulate: The apparatus would include a reactor vessel that would be initially charged with magnesium hydride. The apparatus would exploit two reactions: The endothermic decomposition reaction MgH2-->Mg + H2, which occurs at a temperature greater than or equal to 300 C, and The exothermic oxidation reaction MgH2 + H2O MgO + 2H2, which occurs at a temperature greater than or equal to 330 C.

  7. Synthesis and characterization of LiF: Mg, Ti for ionizing radiations dosimetry; Sintesis y caracterizacion de LiF: Mg, Ti para dosimetria de radiaciones ionizantes

    Lozano R, I. B.


    Among the different thermoluminescence materials (Tl), the LiF:Mg, Ti is the most used for dosimetric purposes, because its equivalence to the human tissue, it has an effective atomic number of 8.14, the best known commercial dosemeter of this kind is the TLD-100. However, because this dosimeter is an imported product, is quite expensive for many research groups and hospitals. The purpose of this work is the optimization of its synthesis, as the dosimetric characterization, so it can replace the imported dosimeters. The synthesis of LiF:Mg, Ti is a careful process, since one of the reagents, the ion fluorine is highly corrosive. In this work the synthesis of the LiF:Mg, Ti was done by the molten substance method, was used LiF of analytical grade and the magnesium (Mg) and titanium (Ti) activators were incorporated in aqueous solution. For to optimize the handle of the material Tl, we elaborated pellets and teflon (Ptfe) was used as agglutinate material, in a 2:3 proportion. First was prepared the LiF, incorporating just Mg as dopant with a concentration of 400 parts per million (ppm). After the Ti with concentrations from 15 to 120 ppm was incorporated keeping fixed the concentration of Mg (400 ppm). The morphological and structural characterization of the Tl material were made by scanning electron microscopy and X-ray diffraction. The optimal concentration of Ti, was determined as a function of the radiation dose sensibility of the Tl material. The material prepared with 60 ppm of the Ti showed a higher sensibility. However, also the rest of the preparations had the requirements recommended by the international agencies to be used in ionizing radiations dosimetry. For the dosimetric characterization were used samples with 400 ppm of Mg, 400 ppm Mg and 30 ppm Ti, 400 ppm Mg and 60 ppm Ti. The LiF:Mg showed its dosimetric peak at 240 C, while the LiF:Mg, Ti (30 ppm and 60 ppm Ti) showed their dosimetric peak at 220 C and 222 C respectively. The study of the Tl

  8. Multiple Group Analysis in Multilevel Structural Equation Model Across Level 1 Groups.

    Ryu, Ehri


    This article introduces and evaluates a procedure for conducting multiple group analysis in multilevel structural equation model across Level 1 groups (MG1-MSEM; Ryu, 2014). When group membership is at Level 1, multiple group analysis raises two issues that cannot be solved by a simple extension of the standard multiple group analysis in single-level structural equation model. First, the Level 2 data are not independent between Level 1 groups. Second, the standard procedure fails to take into account the dependency between members of different Level 1 groups within the same cluster. The MG1-MSEM approach provides solutions to these problems. In MG1-MSEM, the Level 1 mean structure is necessary to represent the differences between Level 1 groups within clusters. The Level 2 model is the same regardless of Level 1 group membership. A simulation study examined the performance of MUML (Muthén's maximum likelihood) estimation in MG1-MSEM. The MG1-MSEM approach is illustrated for both a multilevel path model and a multilevel factor model using empirical data sets.

  9. Formation and Stability of Hollow MgO Nanoshells

    Krishnan, G.; Palasantzas, G.; Kooi, B.J.


    High temperature annealing of gas phase synthesized Mg nanoparticles surrounded by an MgO shell leads to formation of hollow MgO nanoshells due to the evaporation assisted Kirkendall effect. Under electron beam exposure in TEM, the (220) MgO facets reduce their high surface energy by forming cube fa

  10. cDNA library Table: mg [KAIKOcDNA[Archive

    Full Text Available mg NA mg-- p50 midgut fifth instar larval stage D3 mixed pBluescript SK- EcoR1 for ...5' Xho1for 3' sequenced from T3 primer (5' -> 3') AU001868-AU002476,BY916287-BY916543 mg[number],mg[number]_1 ...

  11. The three shapes of 32Mg

    Poves A.


    Full Text Available The N=20 and N=28 “islands of inversion” are described by large scale shell model calculations which mix configurations with different Nħω or equivalently with different number of particles promoted from the sd-shell to the pf -shell. We pay particular attention to the properties of the states at fix Nħω which turn out to be the real protagonists of the physics at N=20. In particular we study the appearance of spherical, deformed and superdeformed structures in 32Mg at fixed 0p-0h, 2p-2h and 4p-4h configurations. Finally we submit that the islands of deformation at N=20 and N=28 merge in the Magnesium isotopes

  12. Simultaneous polymerization of Mg and Zr alkoxides

    Mendez-Vivar, J.; Lara, V.H. [Univ. Autonoma Metropolitana-Iztapalapa, Depto. de Quimica, Mexico, D. F. (Mexico); Mendoza-Serna, R.; Ayala-Morales, A. [Facultad de Estudios Superiores Zaragoza, UNAM, Carrera de Ingenieria Quimica, Mexico, D. F. (Mexico); Bosch, P. [Inst. de Investigaciones en Materiales, UNAM Circuito Exterior, Mexico, D. F. (Mexico)


    The preparation of homogeneous MgO-ZrO{sub 2} ceramics by the sol-gel process is of interest because of its potential technological applications as dielectric materials in thin films and membranes. In this work we used magnesium methoxide and zirconium n-propoxide as precursors. The simultaneous polymerization of the alkoxides was performed via the sol-gel process, using acetylacetone (acacH) and isoeugenol (isoH) separately as the chelating agents, in order to control the hydrolysis and condensation steps. Spectroscopic studies have been performed on the sols, gels, xerogels and oxides, including Fourier transform infrared (FTIR) spectroscopy and small Angle X-ray Scattering (SAXS). (orig.)

  13. Mg II Absorbing Galaxies: Morphologies and Kinematics

    Churchill, C; Kacprzak, G G; Churchill, Chris; Steidel, Chuck; Kacprzak, Glenn


    In this contribution, we review our current knowledge of the properties of galaxies, and their extended halos, selected by MgII absorption in the spectra of background quasars. We then describe recent efforts to quantify the morphologies and orientations of galaxies and explore how these relate to the gas kinematics. In a sample of 26 galaxies, we find no clear connection between the orientation of the quasar line of sight through the galaxy and the velocity spread of the gas. However, it appears that the quantity of gas "stirred up" in the halo may be correlated to asymmetry in the galaxy morphology. Since the galaxies have fairly normal morphologies, this connection may suggest that galaxies with extended halos experienced an interaction or merging event a few dynamical times prior to the epoch of observation.

  14. Multiaxial magnetic ordering in NdMg

    Deldem, M; Galera, R M; Morin, P; Schmitt, D; Ouladdiaf, B


    NdMg is a cubic compound (CsCl-type) which orders antiferromagnetically at T sub N =61 K. The magnetization measurements show a second transition at T sub R =35 K. Over the whole order range, the powder neutron diffraction pattern can be indexed on the hypothesis of a collinear structure, the magnetic moments being parallel to the wave vector. The neutron diffraction experiments on a single crystal, under an applied magnetic field, establish that the transition at T sub R corresponds to a change from a collinear structure to a multiaxial one. The magnetic moments successively point along a fourfold axis, in the collinear structure, and along twofold axes in the multiaxial one. This sequence of magnetic structures is consistent with the coexistence of ferroquadrupolar gamma-couplings and antiferroquadrupolar epsilon-couplings. (author)

  15. Preparation of Mg-MgH2 flakes by planetary ball milling with stearic acid and their hydrogen storage properties

    Hong, Seong-Hyeon; Song, Myoung Youp


    Many studies preparing magnesium hydride using catalyst addition were performed, resulting in the preparation of additive-containing magnesium hydride. Preparation of a sample with a MgH2 phase without additives requires high pressure and high temperature and is time-demanding. In order to prepare an additive-free sample with a MgH2 phase, 90 wt% Mg+10 wt% MgH2 (named 90Mg+10MgH2) was milled under a hydrogen atmosphere with 6 wt% stearic acid as a process-controlling agent, which led to a formation of Mg-MgH2 flakes. The hydrogen storing and releasing properties of the prepared flakes were investigated and compared with those of purchased MgH2. A sample with a majority fraction of MgH2 phase was prepared by planetary ball milling of 90 Mg+10 MgH2 with 6 wt% stearic acid. The resultant particles of 90 Mg+10 MgH2 obtained after hydridingdehydriding cycling were much smaller and had significantly more cracks and defects than those of MgH2 after hydriding-dehydriding cycling. 90 Mg+10 MgH2 released 0.12 wt% hydrogen for 4 min, 3.70 wt% for 20 min, and 5.30 wt% for 60 min at 648 K at the first cycle.

  16. Estabilidad de tabletas de Rifampicina 300 mg

    Lisette Martínez Miranda


    Full Text Available Se realizó el estudio de estabilidad de las tabletas de rifampicina 300 mg. Se utilizó para la cuantificación del principio activo un método analítico desarrollado y validado por cromatografía líquida de alta resolución en fase reversa y detección ultravioleta. El estudio de estabilidad de las tabletas se efectuó mediante los métodos de vida útil y acelerado en condiciones isotérmicas; no se obtuvo una variación notable de la concentración en el tiempo de estudio y se demostró así la estabilidad química y térmica del principio activo, por lo que se proponen 2 años como fecha de vencimiento. La humedad relativa de 75, 84 y 92 % tuvo influencia en la estabilidad de la formulación en el período analizado.The stability study of rifampicin 300 mg was conducted. An analytical method developed and validated by high pressure liquid chromatography in reverse phase and ultraviolet detection was used for the quantification of the actives principle. The stability study of the tablets was conducted by the method of useful life and the accelerated method under isothermic conditions. There was no significant variation of the concentration during the time of study and, thus, the chemical and thermal stability of the active principle was proved. A period of 2 years was proposed as expiration date. A relative humidity of 75, 84 and 92% influenced on the stability of the formulation in the analyzed period.

  17. Validation of the MG-DIS: a disability assessment for myasthenia gravis.

    Raggi, Alberto; Leonardi, Matilde; Schiavolin, Silvia; Antozzi, Carlo; Brenna, Greta; Maggi, Lorenzo; Mantegazza, Renato


    This paper is aimed to present the validation of the myasthenia gravis disability assessment (MG-DIS), a MG-specific patient-reported disability outcome measure. Consecutive MG patients were enrolled, followed-up for 12 months and administered the SF-36, the WHO disability assessment schedule (WHODAS 2.0) and the preliminary 31-item MG-DIS addressing impairments and activity limitations. Factor structure and metric properties were assessed. In total, 109 patients were enrolled: 76 were females, mean age 50, mean MG duration 10.4 years, 86 were AChR-positive. The MG-DIS was reduced to 20 items, explaining 70.6 % of the original questionnaire variance, four subscales (generalized impairment-related problems; bulbar function-related problems; mental health and fatigue-related problems; vision-related problems) and an overall disability index. The MG-DIS has good metric properties (Cronbach's alpha ranging between .808 and .930), is stable, showed to be more sensitive than the WHODAS 2.0 and SF-36 to detect group differences and longitudinal changes and was well correlated with the MG-composite (.642). The MG-DIS includes items representing ocular, generalized, bulbar and respiratory symptoms, and is therefore well-built around MG-specific features. MG-DIS can be used in clinical trials as well as in observational or epidemiological studies to characterize patients' disability level and address the amount of improvement in disability. Further studies are needed to explore the possibility of a shorter disability scale.

  18. Evidence for beta -delayed neutron emission from /sup 31/Mg and /sup 32/Mg

    Zaidins, C S; De Saint-Simon, M; Détraz, C; Epherre-Rey-Campagnolle, Marcelle; Guillemaud, D; Klapisch, Robert; Langevin, M; Naulin, F; Thibault, C; Touchard, F


    Investigates the time spectrum of beta -delayed neutron emission from /sup 30-34/Na and their descendants using beta -neutron coincidence detection. The authors have been able to assign an upper limit of 0,4% to the probability of beta -delayed neutron emission, p/sub n/, from the /sup 30/Na daugher isotope /sup 30/Mg. In fitting the time spectra of beta -delayed neutrons from /sup 31/Na and /sup 32/Na, we find a definitive component from subsequent daughter decay as well. This provides evidence for beta -delayed neutron emission from /sup 31/Mg and /sup 32/Mg with P/sub n/ values of the order of 2% for each. (7 refs).

  19. Ultrathin hexagonal MgO nanoflakes coated medical textiles and their enhanced antibacterial activity

    Veeran Ponnuvelu, Dinesh; Selvaraj, Aravind; Prema Suriyaraj, Shanmugam; Selvakumar, Rajendran; Pulithadathail, Biji


    A facile hydrothermal method for development of ultrathin MgO nanoplates from different precursors and their enhanced antibacterial activity after coating onto medical textiles is reported. Ultrathin MgO nanoplates having hexagonal structure were characterized using UV-visible spectroscopy, atomic force microscopy, field emission scanning electron microscopy, x-ray diffraction and high resolution transmission electron microscopy. The formation of MgO nanoplates was found to exhibit profound anionic effect leading to ultrathin, planar structures with exposed MgO [111] facets, which may be responsible for enhanced antimicrobial activity. Medical fabrics (bleached 100% cotton) were coated with MgO nanoplates using pad-dry-cure method. The antibacterial activity of these fabrics was tested against Bacillus subtilis and Escherichia coli. The MgO nanoplates coated onto the fabric were found to have good adherence properties owing to their two-dimensional structure and were durable even after repeated washings without substantial reduction in the antimicrobial activity. The enhanced antibacterial activity may be attributed to the presence of oxygen vacancies, surface oxygen anions and hydroxyl groups on the surface of MgO nanoplates. This cost-effective functional finish (anti-microbial) to cotton fabric using MgO nanoplates may be suitable for many prospective medical applications and can serve as an alternative to the costlier silver based antimicrobial textiles.

  20. Mg-Enriched Engineered Carbon from Lithium-Ion Battery Anode for Phosphate Removal

    Zhang, Yan; Guo, Xingming; Yao, Ying; Wu, Feng; Zhang, Cunzhong; Chen, Renjie; Lu, Jun; Amine, Khalil


    Three Mg-enriched engineered carbons (mesocarbon microbeads, MCMB) were produced from lithium-ion battery anode using concentrated nitric acid oxidization and magnesium nitrate pretreatment. The obtained 15%Mg-MCMB, 30%Mg-MCMB, and 40%Mg-MCMB have magnesium level of 10.19, 19.13, and 19.96%, respectively. FTIR spectrum shows the functional groups present on the oxidized MCMB including OH, C=O, C–H, and C–O. XRD, SEM-EDX, and XPS analyses show that nanoscale Mg(OH)2 and MgO particles were presented on the surface of the Mg-MCMB samples, which could serve as the main adsorption mechanism as to precipitate phosphate from aqueous solutions. The sorption experiments indicate that Mg modification dramatically promotes MCMB’s phosphate removal ability and phosphate removal rates reach as high as 95%. Thus, modification of the spent LIBs anode could provide a novel direction of preparing wastewater adsorbent and develop an innovative way to achieve sustainable development.

  1. Thermodynamic and kinetic destabilization of magnesium hydride using Mg-In solid solution alloys.

    Zhou, Chengshang; Fang, Zhigang Zak; Lu, Jun; Zhang, Xiaoyi


    Efforts to thermodynamically destabilize magnesium hydride (MgH2), so that it can be used for practical hydrogen storage applications, have been a difficult challenge that has eluded scientists for decades. This letter reports that MgH2 can indeed be destabilized by forming solid solution alloys of magnesium with group III and IVB elements, such as indium. Results of this research showed that the equilibrium hydrogen pressure of a Mg-0.1In alloy is 70% higher than that of pure MgH2. The temperature at 1 bar hydrogen pressure (T1bar) of Mg-0.1In alloy was reduced to 262.9 °C from 278.9 °C, which is the T1bar of pure MgH2. Furthermore, the kinetic rates of dehydrogenation of Mg-0.1In alloy hydride doped with a titanium intermetallic (TiMn2) catalyst were also significantly improved compared with those of MgH2.

  2. Ageing processes in Al-Cu-Mg alloys with different Cu/Mg ratios

    Macchi, C. [IFIMAT, UNCentro and CONICET, Pinto, Tandil (Argentina); Somoza, A. [IFIMAT, UNCentro and CICPBA, Pinto, Tandil (Argentina); Ferragut, R.; Dupasquier, A. [LNESS and CNISM, Politecnico di Milano, Como (Italy); Polmear, I.J. [Emeritus Professor, Department of Materials Engineering, Monash University, Melbourne, Vic. (Australia)


    Three age-hardenable Al-Cu-Mg alloys with different Cu/Mg ratios were studied by means of positron annihilation lifetime spectroscopy and Vickers hardness as a function of the artificial ageing time at 175 C. Complementary information on the decomposition sequence was obtained by means of differential scanning calorimetry. The results are discussed in terms of the different structures that are formed during the precipitation sequence of the supersaturated solid solution. (copyright 2009 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)



    The objective of the present work is to study the casting characteristics of various Al-Li alloys, which include fluidity and strengths of the alloys and their interaction with cast molds. Materials investigated are Al-Li-Mg and Al-Li-Cu-Mg alloys with Li content of 2.5 wt%. The results show that sand molds with resin binders are good for Al-Li casting. Ceramic coatings can further reduce the metal-mold interactions. However, the permeability is also reduced by coating. The fluidity of Li-bea...

  4. Porous composite materials ZrO{sub 2}(MgO)-MgO for osteoimplantology

    Buyakov, Ales, E-mail: [Institute of Strength Physics and Materials Science SB RAS, Tomsk, 634055 (Russian Federation); National Research Tomsk State University, Tomsk, 634050 (Russian Federation); Litvinova, Larisa, E-mail:; Shupletsova, Valeria, E-mail: [Immanuel Kant Baltic Federal University, Kaliningrad (Russian Federation); Kulbakin, Denis, E-mail: [Tomsk Cancer Research Institute, Tomsk, 634050 (Russian Federation); Kulkov, Sergey, E-mail: [Institute of Strength Physics and Materials Science SB RAS, Tomsk, 634055 (Russian Federation); National Research Tomsk State University, Tomsk, 634050 (Russian Federation); National Research Tomsk Polytechnic University, Tomsk, 634050 (Russian Federation)


    The pore structure and phase composition of ceramic composite material ZrO{sub 2}(Mg)-MgO at different sintering temperatures were studied. The main mechanical characteristics of the material were determined and it was shown that they are close to the characteristics of natural bone tissues. It was shown that material structure has a positive effect on the pre-osteoblast cells proliferation. In-vitro studies of pre-osteoblast cells, cultivation on material surface showed a good cell adhesion, proliferation and differentiation of MMSC by osteogenic type.

  5. The Influence of MgH2 on the Assessment of Electrochemical Data to Predict the Degradation Rate of Mg and Mg Alloys

    Wolf-Dieter Mueller


    Full Text Available Mg and Mg alloys are becoming more and more of interest for several applications. In the case of biomaterial applications, a special interest exists due to the fact that a predictable degradation should be given. Various investigations were made to characterize and predict the corrosion behavior in vitro and in vivo. Mostly, the simple oxidation of Mg to Mg2+ ions connected with adequate hydrogen development is assumed, and the negative difference effect (NDE is attributed to various mechanisms and electrochemical results. The aim of this paper is to compare the different views on the corrosion pathway of Mg or Mg alloys and to present a neglected pathway based on thermodynamic data as a guideline for possible reactions combined with experimental observations of a delay of visible hydrogen evolution during cyclic voltammetry. Various reaction pathways are considered and discussed to explain these results, like the stability of the Mg+ intermediate state, the stability of MgH2 and the role of hydrogen overpotential. Finally, the impact of MgH2 formation is shown as an appropriate base for the prediction of the degradation behavior and calculation of the corrosion rate of Mg and Mg alloys.

  6. The influence of MgH2 on the assessment of electrochemical data to predict the degradation rate of Mg and Mg alloys.

    Mueller, Wolf-Dieter; Hornberger, Helga


    Mg and Mg alloys are becoming more and more of interest for several applications. In the case of biomaterial applications, a special interest exists due to the fact that a predictable degradation should be given. Various investigations were made to characterize and predict the corrosion behavior in vitro and in vivo. Mostly, the simple oxidation of Mg to Mg2+ ions connected with adequate hydrogen development is assumed, and the negative difference effect (NDE) is attributed to various mechanisms and electrochemical results. The aim of this paper is to compare the different views on the corrosion pathway of Mg or Mg alloys and to present a neglected pathway based on thermodynamic data as a guideline for possible reactions combined with experimental observations of a delay of visible hydrogen evolution during cyclic voltammetry. Various reaction pathways are considered and discussed to explain these results, like the stability of the Mg+ intermediate state, the stability of MgH2 and the role of hydrogen overpotential. Finally, the impact of MgH2 formation is shown as an appropriate base for the prediction of the degradation behavior and calculation of the corrosion rate of Mg and Mg alloys.

  7. Calibration of the DH6500-MG02 and DH6500-MG03 antennas

    Nielsen, Jeppe Majlund; Pivnenko, Sergey

    frequencies. For the DH6500-MG03 horn the measurement comprises on-axis gain, and on-axis polarization at 601 frequencies. For both horns, the input reection coecient was measured at 601 frequencies. The measurement was carried out at the DTU-ESA Spherical Near-Field Antenna Test Facility in April 2013...

  8. Mechanical and Corrosive Properties of Two Magnesium Wires: Mg4Gd and Mg6Ag

    Maier, Petra; Szakács, Gabor; Wala, Marcin; Hort, Norbert

    The mechanical and corrosive properties of two Magnesium wires are studied in the field of microhardness, tension-, compression-and 3-point-bending tests, corrosion and its influence on the mechanical properties. Due to recrystallization during their complex forming processes (casting, extrusion, wire drawing), both wires show a fine grained microstructure resulting in high strength and ductility. However, the ductility is mostly evaluated by 3-point bending and compression; due to the notch effect in the clamp area, the maximum tensile strength and elongation under tension cannot be measured. Both alloys show a tensile-compressive yield asymmetry. Even RE-elements are known to reduce this asymmetry, the Mg-Gd alloy shows 100 MPa higher strength in tension than compression. The asymmetry of the Mg-Ag wire is similar. Overall the wires show very high strength and hardness, Mg6Ag slightly higher compared to Mg4Gd. Strong pitting corrosion is found and reduces strongly the tensile and bending strength.

  9. Synthesis and Luminescence Properties of Red Phosphors:Mn2+ Doped MgSiO3 and Mg2SiO4 Prepared by Sol-Gel Method


    Sol-gel method was utilized to synthesize two different series of red silicate phosphors:MgSiO3 and Mg2SiO4 powder samples doped with Mn2+, conducted the investigation of red long-lasting phosphor: MgSiO3:Eu2+, Dy3+, Mn2+. TGA curves of the gel precursor for two series depicted that the loss of residual organic groups and NO3 groups occurs below 450 ℃. According to the XRD patterns, the major diffraction peaks of the MgSiO3 and Mg2SiO4 series are consistent with a proto-enstatite structure (JCPDS No.11-0273) and a forsterite structure (JCPDS No.85-1364) respectively. With the excitation at 415 nm, the red emission band of Mn2+ ions is peaked at 661 nm for MgSiO3:1%(atom fraction) Mn2+ or 644 nm for Mg2SiO4:1%(atom fraction) Mn2+. Compared with Mg2SiO4:Mn2+ samples, MgSiO3:Mn2+ samples exhibit higher luminescence intensity and higher quenching concentration. In addition, the two series co-doped with Eu2+, Dy3+, Mn2+ were also prepared. Photo-luminescence and afterglow properties of the two co-doped series were analyzed, which show that MgSiO3:Eu2+, Dy3+, Mn2+ is more suitable for a red long-lasting phosphor.

  10. Comparison of initial loading doses of 5 mg and 10 mg for warfarin therapy

    Sidnei Lastória


    Full Text Available CONTEXT: The question of what is the best loading dosage of warfarin when starting anticoagulant treatment has been under discussion for ten years. We were unable to find any comparative studies of these characteristics conducted here in Brazil. OBJECTIVE: To compare the safety and efficacy of two initial warfarin dosage regimens for anticoagulant treatment. METHODS: One-hundred and ten consecutive patients of both sexes, with indications for anticoagulation because of venous or arterial thromboembolism, were analyzed prospectively. During the first 3 days of treatment, these patients were given adequate heparin to keep aPTT (activated partial thromboplastin time between 1.5 and 2.5, plus 5 mg of warfarin. From the fourth day onwards, their warfarin doses were adjusted using International Normalized Ratios (INR; target range: 2 to 3. This prospective cohort was compared with a historical series of 110 patients had been given 10 mg of warfarin on the first 2 days and 5 mg on the third day with adjustments based on INR thereafter. Outcomes analyzed were as follows: recurrence of thromboembolism, bleeding events and time taken to enter the therapeutic range. RESULTS: Efficacy, safety and length of hospital stay were similar in both samples. The sample that were given 10 mg entered the therapeutic range earlier (means: 4.5 days vs. 5.8 days, were on lower doses at discharge and had better therapeutic indicators at the first return appointment. CONCLUSIONS: The 10 mg dosage regimen took less time to attain the therapeutic range and was associated with lower warfarin doses at discharge and better INR at first out-patients follow-up visit.

  11. Integrated Groups and Smooth Distribution Groups

    Pedro J. MIANA


    In this paper, we prove directly that α-times integrated groups define algebra homo-morphisms. We also give a theorem of equivalence between smooth distribution groups and α-times integrated groups.

  12. Pressure-induced structural transitions in MgH2.

    Vajeeston, P; Ravindran, P; Kjekshus, A; Fjellvåg, H


    The stability of MgH2 has been studied up to 20 GPa using density-functional total-energy calculations. At ambient pressure alpha-MgH2 takes a TiO2-rutile-type structure. alpha-MgH2 is predicted to transform into gamma-MgH2 at 0.39 GPa. The calculated structural data for alpha- and gamma-MgH2 are in very good agreement with experimental values. At equilibrium the energy difference between these modifications is very small, and as a result both phases coexist in a certain volume and pressure field. Above 3.84 GPa gamma-MgH2 transforms into beta-MgH2, consistent with experimental findings. Two further transformations have been identified at still higher pressure: (i) beta- to delta-MgH2 at 6.73 GPa and (ii) delta- to epsilon-MgH2 at 10.26 GPa.

  13. Magnetocaloric phenomena in Mg-ferrite nanoparticles

    Burianova, S; Holec, P; Plocek, J [Charles University, Faculty of Science, Department of Inorganic chemistry, Prague (Czech Republic); Poltierova-Vejpravova, J, E-mail: burianovasimona@email.c, E-mail: jana@mag.mff.cuni.c


    A comparative study of magnetocaloric effect (MCE) in superparamagnetic (SPM) regime is reported in two different types of magnesium ferrite nanostructures. The samples were prepared either by microemulsion method as MgFe{sub 2}O{sub 4} nanoparticles encapsulated in amorphous SiO{sub 2}, or as matrix-less nanoparticles using hydrothermal synthesis in supercritical water conditions. The particle diameter in all prepared samples was obtained from XRD measurements and TEM analysis. All samples show a SPM behavior above the blocking temperature, T{sub B}. The entropy change, {Delta}S was finally derived from the measurements of magnetization, M(H,T) curves at defined temperature intervals. We observed, that all samples show a broad peak of {Delta}S in the temperature range that is fairly above the T{sub B}. The values of the {Delta}S also depend on the particle size, and they are of about two orders lower than those reported in the famous giant magnetocaloric materials.

  14. Group typicality, group loyalty and cognitive development.

    Patterson, Meagan M


    Over the course of childhood, children's thinking about social groups changes in a variety of ways. Developmental Subjective Group Dynamics (DSGD) theory emphasizes children's understanding of the importance of conforming to group norms. Abrams et al.'s study, which uses DSGD theory as a framework, demonstrates the social cognitive skills underlying young elementary school children's thinking about group norms. Future research on children's thinking about groups and group norms should explore additional elements of this topic, including aspects of typicality beyond loyalty.

  15. Which finite simple groups are unit groups?

    Davis, Christopher James; Occhipinti, Tommy


    We prove that if G is a finite simple group which is the unit group of a ring, then G is isomorphic to either (a) a cyclic group of order 2; (b) a cyclic group of prime order 2^k −1 for some k; or (c) a projective special linear group PSLn(F2) for some n ≥ 3. Moreover, these groups do all occur...

  16. Structural relationships among MgZn2 and Mg4Zn7 phases and transition structures in Mg-Zn-Y alloys

    Rosalie, Julian M.; Somekawa, Hidetoshi; Singh, Alok; Mukai, Toshiji


    Isothermal ageing of plastically deformed Mg-Zn-Y alloys resulted in precipitation along ? twin boundaries. The bulky precipitates so formed had structures similar to those recently reported for the rod-like ? precipitates, but afforded a more detailed study by high-resolution TEM due to their larger size. The core of the precipitates often had the structure of the monoclinic Mg4Zn7 phase, and had the orientation ? ; ? with either the matrix or the twin. On this Mg4Zn7 phase, the hexagonal MgZn2 phase grew in two orientations, both with ? . One of these orientations formed a known orientation relationship ? ; ? with the matrix. The part of the precipitate with the MgZn2 structure was usually in direct contact with the twin boundary. Both the Mg4Zn7 and MgZn2 phases have layered structures that can be described with similar building blocks of icosahedrally coordinated atoms. The atomic positions of zinc atoms comprise the vertices of these icosahedra and form 'thick' rhombic tiles. The orientations of these rhombuses remain unchanged across the interfaces between the two phases. Near the interface with MgZn2, transition structures formed in the Mg4Zn7 phase, with the Zn:Mg atom ratio between those of the Mg4Zn7 and MgZn2 phases. In these transition structures, the unit cell of the Mg4Zn7 phase is extended along [100] or [001] by half a unit cell length by continuation of the rhombic tiling. Structures of these extended unit cells are proposed.

  17. Effects of Ca additions on some Mg-alloy hydrides

    Lupu, D.; Biris, A.; Indrea, E.; Bucur, R.V.


    The hydrogenation of the alloy of composition CaMg/sub 1/ /sub 8/Ni/sub 0/ /sub 5/ containing CaMg/sub 2/ and MgNi/sub 2/ shows fast activation kinetics. The Mg/sub 2/Ni phase is observed in the dehydrided samples. The three plateaus on the hydrogen desorption isotherms correspond to the most stable magnesium hydrides observed up to now in Mg-alloy ( H = 20 to 24 kcal/mol H/sub 2/). The effects of Ca additions on the hydrogen storage capacity and desorption rates of some Mg-rich alloys have been studied. 16 references, 3 figures, 1 table.

  18. Pressureless sintering of translucent MgO ceramics

    Chen Dianying [Department of Chemical, Materials and Biomolecular Engineering, Institute of Materials Science, University of Connecticut, Storrs, CT 06269 (United States); Jordan, Eric H. [Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269 (United States)], E-mail:; Gell, Maurice [Department of Chemical, Materials and Biomolecular Engineering, Institute of Materials Science, University of Connecticut, Storrs, CT 06269 (United States)


    MgO nanocrystalline powders were synthesized via a wet precipitation process. X-ray diffraction analysis of the heat-treated precursor powders shows that a crystalline MgO phase forms at {approx}500 deg. C. Translucent MgO ceramics were prepared by pressureless sintering the nanocrystalline MgO powders at 1400 deg. C for 2 h under ambient atmosphere. The as-sintered MgO ceramics have a relative density of 98.1% with an average hardness of 6.8 GPa. Scanning electron microscope characterization revealed that the translucent MgO ceramics have an average grain size of {approx}6 {mu}m.

  19. Acaricidal effects of fluazuron (2.5 mg/kg) and a combination of fluazuron (1.6 mg/kg) + ivermectin (0.63 mg/kg), administered at different routes, against Rhipicephalus (Boophilus) microplus parasitizing cattle.

    Gomes, Lucas Vinicius Costa; Lopes, Welber Daniel Zanetti; Cruz, Breno Cayeiro; Teixeira, Weslen Fabricio; Felippelli, Gustavo; Maciel, Willian G; Bichuette, Murilo Abud; Ruivo, Maycon A; Alcantara Colli, Marcos Henrique; Carvalho, Rafael Silveira; Martinez, Antonio Campanha; Soares, Vando Edésio; da Costa, Alvimar José


    The present study aimed to evaluate the acaricidal efficacy of fluazuron (2.5 mg/kg), administered as a pour-on, in comparison to an injectable formulation containing fluazuron (1.6 mg/kg) + ivermectin (0.63 mg/kg), against Rhipicephalus (Boophilus) microplus in naturally and experimentally infested cattle. Two studies were conducted with different tick strains, one with artificial infestations (Stall Test, using leight animals per group) and one with natural infestations (utilizing ten animals per group). In both studies, the animals were randomized, according to average tick counts performed on days -3, -2 and -1, into four groups: T01, negative control (saline solution); T02, pour-on fluazuron (2.5 mg/kg); T03: subcutaneous fluazuron (1.6 mg/kg) + ivermectin (0.63 mg/kg); and T04 subcutaneous ivermectin (0.63 mg/kg). Based on obtained results, and considering the utilized tick strains, it was possible to conclude that the pour-on fluazuron (2.5 mg/kg) formulation demonstrated high acaricidal efficacy, with protection periods ranging from 49 to 77 days against Rhipicephalus (Boophilus) microplus. On the other hand, for the injectable fluazuron (1.6 mg/kg) + ivermectin (0.63 mg/kg) formulation, it was not possible to observe elevated anti-R. (B.) microplus effect on both artificial and experimental infestation studies. Results observed for this combination were similar or inferior to those obtained by subcutaneous ivermectin (0.63 mg/kg). Future studies with this formulation containing fluazuron (1.6 mg/kg) + ivermectin (0.63 mg/kg), regarding pharmacokinetic and/or bioavailability profiles, or even studies analyzing both this active principles separately, are needed, seeking to better understand the effects of such combination against Rhipicephalus (Boophilus) microplus parasitizing cattle.


    XIAO Shijing; LU Honglan; ZHANG Minghui


    The supported catalysts for propylene polymerization were prepared by milling Mg (OEt)2 with EB (ethylbenzoate) and treating with TiCl4 solution. When TiCl4/(Mg (OEt)2/EB) (mol.) ratio was increased, decrease in contents of -OEt and Ti of the catalysts was observed, while the content of EB increased. It is proved by analyses of IR, X-ray and XPS that during co-milling Mg(OEt)2with EB no reactions have taken place. But after treatment with TiCl4 solution, Mg (OEt)2 converts into MgCl2 and EB coordinates on the resulting MgCl2 carrier, a surface complex forms.The activity of catalysts,isotacticityand vicosimetric molecular weight of polypropylene increase with the decrease of the content of ethoxyl group. The kinetic curves of propene polymerization obtained with present catalysts system display decay curves. It is found from the triad tacticity calculated from the expanded spectra of methyl carbon region that, ethoxyl group in catalyst has an effect on the configuration of polymer chain.

  1. RAPID COMMUNICATION: Formation of MgB2 at ambient temperature with an electrochemical process: a plausible mechanism

    Jadhav, A. B.; Subhedar, K. M.; Hyam, R. S.; Talaptra, A.; Sen, Pintu; Bandyopadhyay, S. K.; Pawar, S. H.


    The binary intermetallic MgB2 superconductor has been synthesized by many research groups. However, the mechanism of its formation is not clearly understood. In this communication, a comprehensive mechanism of the formation of MgB2 from Le Chatelier's principle of equilibrium reaction has been explained both for solid-state reaction and electrodeposition methods.

  2. Lipid peroxidation in the kidney of rats treated with V and/or Mg in drinking water.

    Scibior, Agnieszka; Zaporowska, Halina; Niedźwiecka, Irmina


    Spontaneous and stimulated lipid peroxidation (LPO) after vanadate and magnesium treatment was studied in kidney supernatants obtained from outbred 5-month-old, albino male Wistar rats. The 2-month-old animals daily received: group I (control), deionized water to drink; group II, water solution of sodium metavanadate, NaVO(3) (SMV, 0.125 mg V ml(-1)); group III, water solution of magnesium sulfate, MgSO(4) (MS, 0.06 mg Mg ml(-1)); and group IV, water solution of SMV-MS at the same concentrations as in groups II and III for V and Mg, respectively, over a 12-week period. FeSO(4), NaVO(3) and MgSO(4) were selected as agents that may modify LPO process in in vitro conditions. Spontaneous malondialdehyde (MDA) levels in kidney supernatants increased significantly in the rats in groups II and IV, compared with groups I and III; and they were also significantly higher in all the groups of rats compared with the liver supernatants. The total antioxidant status (TAS) in groups II and IV tended to be higher too. Vanadium concentration in the kidney of the rats in groups II and IV increased, whereas the kidney Mg content in groups II, III and IV decreased, compared with levels in the liver. As the two-way ANOVA indicated, the changes in the basal MDA level, TAS and Mg concentration in the liver of rats at combined V and Mg application only resulted from independent action of V. As far as the in vitro results are concerned, in the supernatants obtained from the rats in groups II and IV, a significant increase in MDA level was demonstrated in the presence of 30 microm of exogenous FeSO(4) as well as 30, 100, 200 and 400 microm NaVO(3) and 100, 200, 400, 600, 800 and 1000 microm MgSO(4), compared with groups I and III. The 600, 800 and 1000 microm of exogenous MgSO(4) also significantly elevated MDA production in the supernatants obtained from the rats in group III, compared with spontaneously formed MDA in the same supernatants. The three-way ANOVA showed that the changes in

  3. Phase equilibria in the Mg-rich corner of the Mg-Zn-La system at 350℃

    LI Hongxiao; REN Yuping; HUANG Mingli; CHEN Qin; HAO Shiming


    The phase equilibria in the Mg-rich corner of the Mg-Zn-La system at 350℃ have been investigated by scanning electron microscopy, X-ray diffraction, and electron probe microanalysis. It has been shown that the linear compound (Mg,Zn)17La2 existed in the Mg-Zn-La system at 350℃. The linear compound (so-called T phase) was with the C-centred orthorhombic crystal structure induced by the solution of significant quantities of the third element. The three-phase region α(Mg) + MgZn(La) + T and the two-phase region composed of the α(Mg) and the linear-compound T phase existed in the Mg-rich corner of the Mg-Zn-La system at 350℃.

  4. Structural and electronic properties of Mg and Mg-Nb co-doped TiO2 (101) anatase surface

    Sasani, Alireza; Baktash, Ardeshir; Mirabbaszadeh, Kavoos; Khoshnevisan, Bahram


    In this paper, by using density functional theory, Mg and Nb-Mg co-doping of TiO2 anatase (101) surfaces are studied. By studying the formation energy of the defects and the bond length distribution of the surface, it is shown that Mg defects tend to stay as far as possible to induce least possible lattice distortion while Nb and Mg defects stay close to each other to cause less stress to the surface. By investigating band structure of the surface and changes stemmed from the defects, potential effects of Mg and Mg-Nb co-doping of TiO2 surface on dye-sensitized solar cells are investigated. In this study, it is shown that the Nb-Mg co-doping could increase JSC of the surface while slightly decreasing VOC compared to Mg doped surface, which might result in an increase in efficiency of the DSSCs compared to Nb or Mg doped surfaces.

  5. Synthesis kinetics of Mg_2Sn in Mg-Sn powder mixture using non-isothermal differential scanning calorimetry

    WU Yu-feng; DU Wen-bo; ZUO Tie-yong


    The non-isothermal heating process of Mg-Sn powder mixture was studied by differential scanning calorimetry(DSC) technique and the synthesis kinetics of Mg_2Sn was evaluated by the model-free and model-fitting methods. The activation energy and conversion function of Mg_2Sn synthesis reaction are calculated to be 281.7 kJ/mol and g(α)=[-ln(1-α)]~(1/4), respectively. The reaction mechanism of 2Mg+Sn→Mg_2Sn under non-isothermal condition is regarded as "nucleation and growth". During the non-isothermal heating process, the phase transformation occurred in the Mg-Sn powder mixture was analyzed by XRD and the microstructure evolution of Mg_2Sn was observed by optical microscopy, which is in good agreement with the reaction mechanism of 2Mg+Sn→Mg_2Sn deduced from the kinetic evaluation.

  6. Performance of Mg-14Li-1Al-0.1Ce as anode for Mg-air battery

    Ma, Yibin; Li, Deyu [School of Chemical Engineering and Technology, Harbin Institute of Technology, West Street No. 92, Harbin 150001 (China); Li, Ning [School of Chemical Engineering and Technology, Harbin Institute of Technology, West Street No. 92, Harbin 150001 (China); Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001 (China); Zhang, Milin; Huang, Xiaomei [Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001 (China)


    In this research, a new Mg-air battery based on Mg-14Li-1Al-0.1Ce was prepared and the battery performance was investigated by constant current discharge test. The corrosion behavior of Mg, AZ31 and Mg-Li-Al-Ce were studied by self-corrosion rate measurement and potentiodynamic polarization measurement. The characteristics of Mg-Li-Al-Ce after discharge were investigated by electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results show that Mg-Li-Al-Ce is more active than Mg and AZ31. The self-corrosion rate is found to be in the order: Mg-Li-Al-Ce < Mg < AZ31. It has been observed that the Mg-air battery based on Mg-Li-Al-Ce offers higher operating voltage, anodic efficiency and capacity than those with Mg and AZ31. SEM and EIS results show that the discharge product of Mg-Li-Al-Ce is loosely adhered to the alloy surface, and thus Mg-Li-Al-Ce could keep high discharge activity during discharge. (author)

  7. Group Cohesion in Experiential Growth Groups

    Steen, Sam; Vasserman-Stokes, Elaina; Vannatta, Rachel


    This article explores the effect of web-based journaling on changes in group cohesion within experiential growth groups. Master's students were divided into 2 groups. Both used a web-based platform to journal after each session; however, only 1 of the groups was able to read each other's journals. Quantitative data collected before and…

  8. Understanding and Enhancing Hydrogen Diffusion in MgH2 and NaMgH3

    Sholl, David; Hao, Shiqiang


    The transport properties of hydrogen in metal hydrides are crucial to the kinetics of H2 storage in these materials. We use first-principles calculations to identify the defects that are relevant for H transport in MgH2 and NaMgH3. In both materials, the physically relevant defects are charged and H diffusion is dominated by mobility of negatively charged interstitial H. Interestingly, the diffusion of these species occurs via concerted mechanisms with low energy barriers. To improve the charged interstitial H diffusivity, a series of transition-metal additives are screened to lower the formation energy of mobile defects. Our results provide a practical way to examine and alter H diffusion in light metal hydrides.

  9. Secondary ageing in an Al-Cu-Mg alloy with high Cu/Mg ratio

    Dupasquier, A.; Folegati, P. [Politecnico di Milano (Italy). Ist. di Fisica della Materia; Ferragut, R. [Politecnico di Milano (Italy). Ist. di Fisica della Materia; IFIMAT, Univ. Nacional del Centro de la Provincia de Buenos Aires and CICPBA, Tandil (Argentina); Massazza, M.; Riontino, G. [Ist. Nazionale di Fisica della Materia, Dipt. di Chimica I.F.M., Univ. di Torino (Italy); Somoza, A. [IFIMAT, Univ. Nacional del Centro de la Provincia de Buenos Aires and CICPBA, Tandil (Argentina)


    The mechanisms governing secondary ageing (structural transformations occurring at low temperature after a heat treatment at higher temperature) were investigated by combined measurements of positron lifetimes, Vickers microhardness measurements and differential scanning calorimetry (DSC) on a laboratory alloy (Al-4.5 wt.% Cu-0.56 wt.% Mg). The results show that hardening occurs at a much slower rate than in case of primary ageing at RT. The positron lifetime data suggest that the hardening rate is controlled by slow release of vacancies from Cu-rich clusters formed during the initial high temperature treatment. The hardening stage is concomitant with an increase of the positron lifetime, and has probably the same origin, which is the formation of solute clusters containing vacancies and Mg as essential components. The formation at low temperature of new structures is also demonstrated by DSC. (orig.)

  10. Room-temperature perpendicular magnetic anisotropy of MgO/Fe/MgO ultrathin films

    Kozioł-Rachwał, A.; Ślęzak, T.; Przewoźnik, J. [Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków (Poland); Skowroński, W.; Stobiecki, T. [Department of Electronics, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków (Poland); Wilgocka-Ślęzak, D. [Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Kraków (Poland); Qin, Q. H.; Dijken, S. van [NanoSpin, Department of Applied Physics, Aalto University School of Science, P.O. Box 15100, FI-00076 Aalto (Finland); Korecki, J. [Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków (Poland); Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Kraków (Poland)


    We used the anomalous Hall effect to study the magnetic properties of MgO/Fe(t)/MgO(001) structures in which the Fe thickness t ranged from 4 Å to 14 Å. For the iron deposited at 140 K, we obtained perpendicular magnetization at room temperature below the critical thickness of t{sub c} = (9 ± 1) Å. In the vicinity of t{sub c}, the easy magnetization axis switched from an out-of-plane orientation to an in-plane orientation, and the observed spin-reorientation transition was considered in terms of the competition among different anisotropies. The perpendicular magnetization direction was attributed to magnetoelastic anisotropy. Finally, the temperature-dependent spin-reorientation transition was analyzed for Fe thicknesses close to t{sub c}.

  11. Prevention of Streptozotocin-Induced Diabetic Nephropathy by MG132: Possible Roles of Nrf2 and IκB

    Wang, Yangwei; Tan, Yi; Miao, Lining


    Our previous study showed that proteasomal inhibitor MG132 can prevent diabetic nephropathy (DN) along with upregulation of nuclear factor (erythroid-derived 2)-like 2 (Nrf2). The present study was to investigate whether MG132 can prevent DN in wild-type and Nrf2-KO mice. Type 1 diabetes was induced in wild-type and Nrf2-KO mice by multiple low doses of streptozotocin. Two weeks after streptozotocin injection, both wild-type and Nrf2-KO mice were randomly divided into four groups: control, MG132, DM, and DM/MG132. MG132 (10 μg/kg/day) or vehicle was administered intraperitoneally for 4 months. Renal function, morphology, and biochemical changes were measured after 4-month treatment with MG132. MG132 treatment suppressed proteasomal activity in the two genotypes. In wild-type mice, MG132 attenuated diabetes-induced renal dysfunction, fibrosis, inflammation, and oxidative damage along with increased Nrf2 and IκB expression. Deletion of Nrf2 gene resulted in a partial, but significant attenuation of MG132 renal protection in Nrf2-KO mice compared with wild-type mice. MG132-increased IκB expression was not different between wild-type and Nrf2-KO mice. This work indicates that MG132 inhibits diabetes-increased proteasomal activity, resulting in Nrf2 and IκB upregulation and renal protection, which could be used as a strategy to prevent diabetic nephropathy. PMID:28373900

  12. Superiority of fesoterodine 8 mg vs 4 mg in reducing urgency urinary incontinence episodes in patients with overactive bladder: results of the randomised, double-blind, placebo-controlled EIGHT trial.

    Chapple, Christopher; Schneider, Tim; Haab, François; Sun, Franklin; Whelan, Laurence; Scholfield, David; Dragon, Erika; Mangan, Erin


    To assess the superiority of fesoterodine 8 mg vs 4 mg for improvement in urgency urinary incontinence (UUI) episodes and other diary variables, diary-dry rate (proportion of patients with >0 UUI episodes on baseline diary and 0 UUI episodes on post-baseline diary), and improvements in measures of symptom bother, health-related quality of life (HRQL), and other patient-reported outcomes (PROs). This was a 12-week, randomised, double-blind, placebo-controlled, multinational trial of men and women aged ≥18 years with overactive bladder (OAB) symptoms including UUI ( ID NCT01302067). Patients were randomised (2:2:1) to receive fesoterodine 8 mg, fesoterodine 4 mg, or placebo once daily; those randomised to fesoterodine 8 mg started with fesoterodine 4 mg once daily for 1 week, then 8 mg once daily for the remaining 11 weeks. Patients completed bladder diaries at baseline and weeks 4 and 12 and the Patient Perception of Bladder Condition (PPBC), Urgency Perception Scale (UPS), and Overactive Bladder Questionnaire (OAB-q) at baseline and week 12. The primary endpoint was change from baseline to week 12 in UUI episodes per 24 h. At week 12, patients receiving fesoterodine 8 mg (779 patients) had significantly greater reductions from baseline in UUI episodes, micturitions, and urgency episodes than patients receiving fesoterodine 4 mg (790) or placebo (386); diary-dry rate was significantly higher in the fesoterodine 8-mg group vs the fesoterodine 4-mg and placebo groups (all P fesoterodine 8 mg also had significantly greater improvements in scores on the PPBC, UPS, and all OAB-q scales and domains than patients receiving fesoterodine 4 mg or placebo (all P fesoterodine 4 mg had significantly greater improvements in UUI episodes, urgency episodes, and micturitions; significantly higher diary-dry rates; and significantly greater improvement in PPBC scores and OAB-q scores than patients receiving placebo (all P fesoterodine groups (placebo group, 3

  13. Effect of Qingyitang on activity of intracellular Ca2+-Mg2+-ATPase in rats with acute pancreatitis

    Ying Qiu; Yong-Yu Li; Shu-Guang Li; Bo-Gen Song; Gui-Fen Zhao


    AIM: To study the change of intracellular calcium-magnesium ATPase (Ca2+-Mg2+-ATPase) activity in pancreas, liver and kidney tissues of rats with acute pancreatitis (AP), and to investigate the effects of Qingyitang (QYT) (Decoction for clearing the pancreas) and tetrandrine (Tet) and vitamin E (VitE) on the activity of Ca2+-Mg2+-ATPase.METHODS: One hundred and five Sprague-Dawley rats were randomly divided into: normal control group, AP group,treatment group with QYT (1 mi/100 g) or Tet (0.4 ml/L00 g)or VitE (100 mg/kg). AP model was prepared by a retrograde injection of sodium taurocholate into the pancreatic duct.Tissues of pancreas, liver and kidney of the animals were taken at 1 h, 5 h, 10 h respectively after AP induction, and the activity of Ca2+-Mg2+-ATPase was studied using enzymehistochemistry staining. Meanwhile, the expression of Ca2+-Mg2+-ATPase of the tissues was studied by RT-PCR.RESULTS: The results showed that the positive rate of Ca2+-Mg2+-ATPase in AP group (8.3%, 25%, 29.2%) was lower than that in normal control group (100%) in all tissues (P<0.01), the positive rate of Ca2+-Mg2+-ATPase in treatment group with QYT (58.3%, 83.3%, 83.3%), Tet (50.0%,70.8%, 75.0%) and VitE (54.2%, 75.0%, 79.2%) was higher than that in AP group (8.3%, 25.0%, 29.2%) in all tissues (P<0.01). RT-PCR results demonstrated that in treatment groups Ca2+-Mg2+-ATPase gene expression in pancreas tissue was higher than that in AP group at the observing time points, and the expression at 5 h was higher than that at L h. The expression of Ca2+-Mg2+-ATPase in liver tissue was positive, but without significant difference between different groups.CONCLUSION: The activity and expression of intracellular Ca2+-Mg2+-ATPase decreased in rats with AP, suggesting that Ca2+-Mg2+-ATPase may contribute to the occurrence and development of cellular calcium overload in AP. QYT, Tet and VitE can increase the activity and expression of Ca2+-Mg2+-ATPase and may relieve intracellular calcium

  14. Transition of interface oxide layer from porous Mg(OH)2 to dense MgO induced by polyaniline and corrosion resistance of Mg alloy therefrom

    Luo, Yizhong; Sun, Yang; Lv, Jinlong; Wang, Xianhong; Li, Ji; Wang, Fosong


    The feasibility of polyaniline emeraldine base (EB) for enhancing long-term corrosion resistance of magnesium alloy (AZ91D Mg alloy) was confirmed, since the complex impedance of Mg alloy protected by EB/epoxy resin (ER) composite coating with 10 wt% EB loading maintained around 2 GΩ cm2 even after 80 day exposure in 0.5 M NaCl solution, while that of pure ER coated analogue decreased to 0.17 MΩ cm2 only after 31 days. The improvement in corrosion resistance was attributed to the transition of interface layer from porous Mg(OH)2 dominated one underneath pure ER coating to dense MgO dominated one underneath EB/ER coating, induced by the redox interaction of EB with Mg alloy. When the EB loading in EB/ER coating increased from 0 to 10 wt%, the relative XPS peak area ratio of MgO to Mg(OH)2 increased from 0.78 to 1.18, indicating that EB behaved as effective corrosion inhibitor causing the transformation of oxide layer from porous Mg(OH)2 to dense MgO.

  15. Group Work Publication-1991.

    Zimpfer, David G.


    Lists 21 new publications in group work, of which 9 are reviewed. Those discussed include publications on group counseling and psychotherapy, structured groups, support groups, psychodrama, and social group work. (Author/NB)

  16. [Fluconazole 1200mg or 800mg for cryptococcal meningitis treatment in Ivory Coast].

    Kouakou, G A; Ello, N F; Kassi, N A; Keita, M; Doumbia, A; Mossou, C; Kassi, F K; Tanon, A; Ehui, E; Eholié, S P


    Assessing the use of high-dose fluconazol monotherapy (1200mg or 800mg) in the treatment and prognosis of HIV-associated cryptococcal meningitis in Ivory Coast. A retrospective study carried out from August 2008 to August 2011 based on patients charts suffering from CM in the Abidjan Tropicals and Infectious Disease Unit. Mortality rate and associated factors were analyzed. Forty-six cases of cryptococcal meningitis (2.5% of hospitalizations) were included. The sex-ratio was of 1.2. The median age was 40.5 [35-47] years. The symptomatology was subacute (93.5%). The main clinical symptoms were syndrome of pure meningeal irritation (65%), fever (100%); 35% of patients had encephalomeningits. Twenty-one (45.7%) was ART-naïve patients. Fluconazole 1200mg was prescribed to 29 (63%) patients. Therapeutic lumbar punctures were performed in 42 (91.3) patients. The mortality rate was 50%. Significant predictors of mortality were encephalomeningitis and therapeutic lumbar puncture. Cryptococcal meningitis associated mortality remains high despite the use of high-dose fluconazole monotherapy. Therapeutic lumbar punctures help to improving the prognosis. Copyright © 2016 Elsevier Masson SAS. All rights reserved.

  17. Combinatorial search for hydrogen storage alloys: Mg-Ni and Mg-Ni-Ti

    Oelmez, Rabia; Cakmak, Guelhan; Oeztuerk, Tayfur [Dept. of Metallurgical and Materials Engineering, Middle East Technical University, 06531 Ankara (Turkey)


    A combinatorial study was carried out for hydrogen storage alloys involving processes similar to those normally used in their fabrication. The study utilized a single sample of combined elemental (or compound) powders which were milled and consolidated into a bulk form and subsequently deformed to heavy strains. The mixture was then subjected to a post annealing treatment, which brings about solid state reactions between the powders, yielding equilibrium phases in the respective alloy system. A sample, comprising the equilibrium phases, was then pulverized and screened for hydrogen storage compositions. X-ray diffraction was used as a screening tool, the sample having been examined both in the as processed and the hydrogenated state. The method was successfully applied to Mg-Ni and Mg-Ni-Ti yielding the well known Mg{sub 2}Ni as the storage composition. It is concluded that a partitioning of the alloy system into regions of similar solidus temperature would be required to encompass the full spectrum of equilibrium phases. (author)

  18. Prevalence of gastroduodenal ulcers/erosions in patients taking low-dose aspirin with either 15 mg/day of lansoprazole or 40 mg/day of famotidine: the OITA-GF study 2.

    Tamura, Akira; Murakami, Kazunari; Kadota, Junichi


    The preventive effects of histamine 2 receptor antagonists vs. proton pump inhibitors on low-dose aspirin (LDA)-related gastroduodenal mucosal injury have not been fully investigated. We conducted a cross-sectional study to compare the prevalence of gastroduodenal ulcers or erosions in patients taking LDA with either 40 mg/day of famotidine or 15 mg/day of lansoprazole for at least three months. Of 84 eligible patients, two taking 40 mg/day of famotidine and four taking 15 mg/day of lansoprazole refused to undergo upper gastrointestinal endoscopy. Ultimately, we performed upper gastrointestinal endoscopy in 78 patients taking either 40 mg/day of famotidine (group F, n = 31) or 15 mg/day of lansoprazole (group L, n = 47). The prevalence of gastroduodenal ulcers or erosions and the magnitude of gastric mucosal injury evaluated using modified Lanza scores were compared between the two groups. No patients in either group had gastroduodenal ulcers. Gastroduodenal erosions were more prevalent in group F than in group L (48.4% vs. 17.0%, p = 0.005). The modified Lanza scores (mean ± SD) were significantly higher in group F than in group L (0.9 ± 1.3 vs. 0.3 ± 0.7, p = 0.007). A multivariate logistic regression analysis showed that the use of lansoprazole was negatively associated with gastroduodenal erosions. This study suggests that 15 mg/day of lansoprazole may be more effective in preventing the development of LDA-related gastroduodenal erosions than 40 mg/day of famotidine. The preventive effects of these two regimens on the development of LDA-related gastroduodenal ulcers require further investigation.

  19. Preparation of 24Mg-Fe-Cu Target

    FAN; Qi-wen; DU; Ying-hui; ZHANG; Rong


    <正>The three-layer-sandwich targets of 24Mg-Fe-Cu needed to be prepared in the physics experiment. The middle layers are thin ferromagnetic Fe layers of about 3.2 mg/cm2. The recoil stopper layers are thick crystallized and defect-free Cu layers of about 15 mg/cm2. The thickness of the 24Mg target layers is about 300 μg/cm2, and the uniformity should be better than 90%.

  20. Efficacy and safety of tamsulosin hydrochloride 0.2 mg and combination of tamsulosin hydrochloride 0.2 mg plus solifenacin succinate 5 mg after transurethral resection of the prostate: a prospective, randomized controlled trial

    Shin YS


    Full Text Available Yu Seob Shin,1,* Li Tao Zhang,1,* Jae Hyung You,1 In Sung Choi,1 Chen Zhao,2 Jong Kwan Park1 1Department of Urology, Chonbuk National University and Research Institute of Clinical Medicine of Chonbuk National University-Biomedical Research Institute and Medical Device Clinical Trial Center of Chonbuk National University, Jeonju, Republic of Korea; 2Department of Urology, Renji Hospital, Shanghai Jiao Tong University School of Medicine, and Shanghai Institute of Andrology, Shanghai, People’s Republic of China *These authors contributed equally to this work Objective: The objective of this study was to evaluate the safety and efficacy of tamsulosin hydrochloride 0.2 mg (TAM and its combination with solifenacin succinate 5 mg (SOL after transurethral resection of the prostate (TURP.Patients and methods: The patients were randomized into three groups: TURP (group 1, TURP plus TAM (group 2, and TURP plus TAM + SOL (group 3. Patients in group 2 and group 3 received medication for 4 weeks. The primary efficacy end points were the mean change in total International Prostate Symptom Score (IPSS and IPSS subscores. The secondary end points included quality-of-life score, Overactive Bladder Symptom Score, and short-form voiding and storage score of International Continence Society.Results: In total, 37 men (31.8% in group 1, 37 men (31.8% in group 2, and 42 men (36.2% in group 3 completed the study. In total IPSS, no significant improvement was seen from baseline to the end of treatment in groups 2 and 3 compared with group 1. However, in group 2, the decrement in the IPSS storage score was smaller than group 1 (P=0.02, and in group 3, the decrement in the IPSS voiding score was smaller than group 1 (P=0.05. In groups 2 and 3 compared with group 1, improvements in the quality of life score, total score of Overactive Bladder Symptom Score, and short-form voiding score and storage score of International Continence Society were not statistically

  1. MgB2 tunnel junctions and SQUIDs

    Brinkman, A.; Rowell, J.M.


    Recent advances in the realization and understanding of MgB2 tunnel junctions and SQUIDs are surveyed. High quality MgB2 junctions with suitable tunnel barriers have been realized based on both oriented and epitaxial thin MgB2 films. Multiband transport properties, such as the existence of two energ

  2. Hydrogen absorption and desorption in rapidly solidified Mg- Al alloys

    Urgnani, J.; Di Chio, M.; Palumbo, M.; Feuerbacher, M.; Fernandez, J. F.; Leardini, F.; Baricco, M.


    The addition of Al to Mg has been indicated as a suitable way to destabilise the hydride phase, in order to bring the absorption and desorption reactions close to reasonable temperatures and pressure values for hydrogen storage. Rapid solidification is known to refine the microstructure of Mg-Al alloys and it might improve the H2 absorption/desorption kinetics. In this paper, the interaction of H2 with rapidly solidified Mg-Al alloys have been studied for three different composition: Mg38.5Al61.5, Mg69Al31 and Mg72Al28. For Mg72Al28, no significant changes in the microstructure have been obtained by rapid solidification. In Mg69Al31, a significant grain refinement has been observed, whereas, for Mg38.5Al61.5, the formation of a metastable hexagonal phase has been found. In all cases, a disproportionation reaction has been observed after H2 absorption, leading to MgH2. After heating up to 430 °C the hydrogenated samples, a main desorption reaction from MgH2 has been observed, which brings again to the starting phases. Experimental results have been discussed on the basis of a thermodynamic assessment of the Mg-Al-H system.

  3. Thermodynamic assessment of the Bi-Mg binary system

    Chunju NIU; Changrong LI; Zhenmin DU; Cuiping GUO; Yongjuan JING


    The Bi-Mg binary system had been assessed by adopting the ionic melt and the modified quasi-chemical models to describe the liquid phase with short range ordering behavior.In general considerations of the development of the thermodynamic database of the multi-component Mg-based alloys and the consistency of the thermodynamic models of the related phases,the Gibbs energy descriptions of all the phases in the Bi-Mg binary system were reasonably re-modeled and critically re-assessed in the present work.Especially for the liquid phase,the associate model was used with the constituent species Bi,Mg and Bi2Mg3.The Mg-rich terminal phase hcp_A3 was modeled as a substitutional solution following Redlich-Kister equation and the Bi-rich terminal phase Rhombohedral_A7 was treated as a pure Bi substance since the extremely small solubility of Mg in Bi. The low and high temperature nonstoichiometric compounds β-Bi2Mg3 and α-Bi2Mg3 were described by the sublattice models (Bi,Va)2Mg3 and (Bi)1 (Bi,Va)aMg6 respectively based on their structure features.A set of self-consistent thermodynamic parameters of the Bi-Mg system was obtained and the experimental thermodynamic and phase equilibrium data were well reproduced by the optimized thermodynamic data.

  4. Hydrogen absorption and desorption in rapidly solidified Mg- Al alloys

    Urgnani, J; Di Chio, M; Palumbo, M; Baricco, M [Dipartimento di Chimica I.F.M. and NIS, Universita di Torino, via P. Giuria, 10125, Torino (Italy); Feuerbacher, M [Institut fuer Mikrostrukturforschung, Forschungszentrum Juelich GmbH, Leo-Brand- Strasse, 52428 Juelich (Germany); Fernandez, J F; Leardini, F, E-mail: jacopo.urgnani@unito.i [Departamento de Fisica de Materiales, Universidad Autonoma de Madrid, Cantoblanco, 28049, Madrid (Spain)


    The addition of Al to Mg has been indicated as a suitable way to destabilise the hydride phase, in order to bring the absorption and desorption reactions close to reasonable temperatures and pressure values for hydrogen storage. Rapid solidification is known to refine the microstructure of Mg-Al alloys and it might improve the H{sub 2} absorption/desorption kinetics. In this paper, the interaction of H{sub 2} with rapidly solidified Mg-Al alloys have been studied for three different composition: Mg{sub 38.5}Al{sub 61.5}, Mg{sub 69}Al{sub 31} and Mg{sub 72}Al{sub 28}. For Mg{sub 72}Al{sub 28}, no significant changes in the microstructure have been obtained by rapid solidification. In Mg{sub 69}Al{sub 31}, a significant grain refinement has been observed, whereas, for Mg{sub 38.5}Al{sub 61.5}, the formation of a metastable hexagonal phase has been found. In all cases, a disproportionation reaction has been observed after H{sub 2} absorption, leading to MgH{sub 2}. After heating up to 430 deg. C the hydrogenated samples, a main desorption reaction from MgH{sub 2} has been observed, which brings again to the starting phases. Experimental results have been discussed on the basis of a thermodynamic assessment of the Mg-Al-H system.

  5. Group theories: relevance to group safety studies.

    Benevento, A L


    Promoting safety in the workplace has been attempted in a variety of ways. Increasingly, industries are using groups such as safety teams and quality circles to promote worker safety. Group influences on individual behavior and attitudes have long been studied in the social psychology literature, but the theories have not been commonly found outside the psychology arena. This paper describes the group theories of group polarization, risky shift, social loafing, groupthink and team think and attempts to apply these theories to existing studies that examine work group influences on safety. Interesting parallels were found but only one study examined group influences as their primary focus of research. Since groups are increasingly used for safety promotion, future research on safety that studies group influences with respect to current group theories is recommended.

  6. Cardiovascular effect of dental anesthesia with articaine (40 mg with epinefrine 0,5 mg % and 40 mg with epinefrine 1 mg%) versus mepivacaine (30 mg and 20 mg with epinefrine 1 mg%) in medically compromised cardiac patients: a cross-over, randomized, single blinded study.

    Torres-Lagares, Daniel; Serrera-Figallo, María-Ángeles; Machuca-Portillo, Guillermo; Corcuera-Flores, José-Ramón; Machuca-Portillo, Carmen; Castillo-Oyagüe, Raquel; Gutiérrez-Pérez, José-Luis


    The aim of the present study is to compare cardiovascular safety profiles of two dental anesthetics: articaine versus two standard mepivacaine solutions used during etiological periodontal treatment in cardiovascular patients. Using a cross-over study design, ten cardiovascular patients were randomly assigned to dental treatment with 1.8 mL of a local anesthetic injected on each quadrant of the mouth: Articaine (40 mg with Epinephrine 0.5 mg % and 40 mg with Epinephrine 1mg %) or Mepivacaine (30 mg and 20 mg with Epinephrine 1mg %). A computer programme enabled continuous longitudinal data collection: O2 saturation, blood pressure (BP) and heart rate (HR). No severe clinical side effects were observed. During the treatment period, we observed statistically significant differences as regards HR between injections with and without adrenalin (p< 0.039) and as regards systolic (p< 0.046) and diastolic (p < 0.046) blood pressure during the stabilization period. In both cases, the parameters under study increase. Age, gender, jaw treated, treatment duration and the rest of cardiovascular variables did not affect the results. None of the patients underwent ischemic alterations or any other complication derived from the treatment or the anesthesia. According to the results of our study, dental anesthetics with standard concentrations of Epinephrine seem to alter HR and BP. Although no cardiac ischemic alterations or any other cardiovascular complications have been observed, we must be cautious with the administration of anesthetics containing vasoconstrictors in patients with cardiovascular diseases.

  7. Corrosion Resistance of the Superhydrophobic Mg(OH)2/Mg-Al Layered Double Hydroxide Coatings on Magnesium Alloys

    Zhang, Fen; Zhang, Changlei; Zeng, Rongchang; Song, Liang; Guo, Lian; Huang, Xiaowen


      Coatings of the Mg(OH)2/Mg-Al layered double hydroxide (LDH) composite were formed by a combined co-precipitation method and hydrothermal process on the AZ31 alloy substrate in alkaline condition...

  8. Fabrication of Mg-doped ZnO thin films by laser ablation of Zn:Mg target

    Kim, Tae Hyun; Park, Jin Jae; Nam, Sang Hwan; Park, Hye Sun; Cheong, Nu Ri [Department of Chemistry, Kyunghee University, Seoul 130-701 (Korea, Republic of); Song, Jae Kyu [Department of Chemistry, Kyunghee University, Seoul 130-701 (Korea, Republic of)], E-mail:; Park, Seung Min [Department of Chemistry, Kyunghee University, Seoul 130-701 (Korea, Republic of)], E-mail:


    Mg-doped ZnO thin films were fabricated by laser ablation of Zn:Mg targets consisting of Mg metallic strips and Zn disk in oxygen atmosphere with a goal to facilitate convenient control of Mg contents in the films. The characteristics of the deposited films were examined by analyzing their photoluminescence (PL), X-ray diffraction and X-ray photoelectron spectroscopy (XPS) spectra. Mg contents as analyzed by XPS indicate that the target composition is fairly transferred to the deposited films. The wurtzite structure of ZnO was conserved even for the highly doped ZnO films and there was no Mg- or MgO-related XRD peaks. With increase in the Mg content, the bandgap and PL peak energy shifted to blue and the Stokes shift became larger.

  9. Pregnancy-induced changes in the long-term pharmacokinetics of 1.1 mg vs. 5 mg folic acid: a randomized clinical trial.

    Shere, Mahvash; Nguyen, Patricia; Tam, Carolyn; Stern, Seth; Kapur, Bhushan; O'Connor, Deborah L; Koren, Gideon


    The objective of this randomized clinical trial was to compare steady-state gestational RBC and plasma folate concentrations in pregnant women supplementing daily with 1.1 mg (regular dose) vs. 5 mg (high dose) folic acid. Thirty-seven pregnant women, who were not previously taking folic acid, were enrolled in this open-label, 2-arm, randomized clinical trial after informed consent. Participants were randomly assigned either 1.1 or 5 mg of folic acid-containing prenatals until gestational age (g.a.) 30 weeks. Plasma and RBC folate concentrations were measured at baseline, g.a.6 weeks, g.a.12 weeks, and g.a.30 weeks using a chemiluminescent immunoassay. Results showed sustained significant increase in RBC folate in the 5 mg group between g.a.6 weeks and g.a.30 weeks (P pregnancy alter long-term folate pharmacokinetics. Despite supplementation over an extended period of time, steady-state does not seem to be achieved in either dose group within our study.

  10. Coherent interface structures and intergrain Josephson coupling in dense MgO/Mg{sub 2}Si/MgB{sub 2} nanocomposites

    Ueno, Katsuya; Takahashi, Kazuyuki; Uchino, Takashi, E-mail: [Department of Chemistry, Graduate School of Science, Kobe University, Nada, Kobe 657-8501 (Japan); Nagashima, Yukihito [Nippon Sheet Glass Co., Ltd., Konoike, Itami 664-8520 (Japan); Seto, Yusuke [Department of Planetology, Graduate School of Science, Kobe University, Nada, Kobe 657-8501 (Japan); Matsumoto, Megumi; Sakurai, Takahiro [Center for Support to Research and Education Activities, Kobe University, Nada, Kobe 657-8501 (Japan); Ohta, Hitoshi [Molecular Photoscience Research Center, Kobe University, Nada, Kobe 657-8501 (Japan)


    Many efforts are under way to control the structure of heterointerfaces in nanostructured composite materials for designing functionality and engineering application. However, the fabrication of high-quality heterointerfaces is challenging because the crystal/crystal interface is usually the most defective part of the nanocomposite materials. In this work, we show that fully dense insulator (MgO)/semiconductor(Mg{sub 2}Si)/superconductor(MgB{sub 2}) nanocomposites with atomically smooth and continuous interfaces, including epitaxial-like MgO/Mg{sub 2}Si interfaces, are obtained by solid phase reaction between metallic magnesium and a borosilicate glass. The resulting nanocomposites exhibit a semiconductor-superconducting transition at 36 K owing to the MgB{sub 2} nanograins surrounded by the MgO/Mg{sub 2}Si matrix. This transition is followed by the intergrain phase-lock transition at ∼24 K due to the construction of Josephson-coupled network, eventually leading to a near-zero resistance state at 17 K. The method not only provides a simple process to fabricate dense nanocomposites with high-quality interfaces, but also enables to investigate the electric and magnetic properties of embedded superconducting nanograins with good intergrain coupling.

  11. Structural and electronic properties of Mg and Mg-Nb co-doped TiO2 (101) anatase surface

    Sasani, Alireza [Department of Science, Karaj Islamic Azad University, Karaj, Alborz, P.O. Box 31485-313 (Iran, Islamic Republic of); Baktash, Ardeshir [Institute of Nano Science and Nano Technology, University of Kashan, Kashan, P.O. Box 87317-51167 (Iran, Islamic Republic of); Mirabbaszadeh, Kavoos, E-mail: [Department of Energy Engineering and Physics, Amirkabir University of Technology, Tehran, P. O. Box 15875-4413 (Iran, Islamic Republic of); Khoshnevisan, Bahram [Institute of Nano Science and Nano Technology, University of Kashan, Kashan, P.O. Box 87317-51167 (Iran, Islamic Republic of)


    Highlights: • Formation energy of Mg and Mg-Nb co-doped TiO{sub 2} anatase surface (101) is studied. • Effect of Mg defect to the TiO{sub 2} anatase (101) surface and bond length distribution of the surface is studied and it is shown that Mg defects tend to stay far from each other. • Effect of Mg and Nb to the bond length distribution of the surface studied and it is shown that these defects tend to stay close to each other. • Effects of Mg and Mg-Nb defects on DSSCs using TiO{sub 2} anatase hosting these defects are studied. - Abstract: In this paper, by using density functional theory, Mg and Nb-Mg co-doping of TiO{sub 2} anatase (101) surfaces are studied. By studying the formation energy of the defects and the bond length distribution of the surface, it is shown that Mg defects tend to stay as far as possible to induce least possible lattice distortion while Nb and Mg defects stay close to each other to cause less stress to the surface. By investigating band structure of the surface and changes stemmed from the defects, potential effects of Mg and Mg-Nb co-doping of TiO{sub 2} surface on dye-sensitized solar cells are investigated. In this study, it is shown that the Nb-Mg co-doping could increase J{sub SC} of the surface while slightly decreasing V{sub OC} compared to Mg doped surface, which might result in an increase in efficiency of the DSSCs compared to Nb or Mg doped surfaces.

  12. NF3 Decomposition over Mn/MgO and Cr/MgO Without Water%NF3在Mn/MgO和Cr/MgO上的分解反应

    殷春晓; 毕翠玉; 张烽林; 徐秀峰


    用Mn (NO3)2和Cr(NO3)3溶液浸渍MgO制备了Mn/MgO和Cr/MgO系列脱氟剂;考察了无水条件下,NF3在Mn/MgO和Cr/MgO上的分解反应,并对反应前后的脱氟剂进行了XRD、N2吸附-脱附和EDX表征,分析了影响脱氟活性的原因.实验结果表明,Mn/MgO的脱氟活性显著高于MgO,但Cr/MgO的脱氟活性比MgO低;在反应气体积组成2%NF3/98%He、流量50 mL/min、脱氟剂用量2 g、400℃的条件下,NF3在10%(Mn原子与MgO的质量比)Mn/MgO上的全转化时间达460 min.依据表征结果和热力学计算数据,认为NF3与Mn/MgO反应生成的表层MnF3可与MgO进行氟/氧交换,促进了MgO的氟化反应,提高了Mn/MgO的脱氟活性;而NF3与Cr/MgO反应生成的表层CrF3不能与MgO进行氟/氧交换反应,且低比表面积、低孔体积的CrF3致密层附着在MgO表面,限制了NF3扩散至MgO孔中进行分解反应,降低了Cr/MgO的脱氟活性.

  13. Mg Alloy Foam Fabrication via Melt Foaming Method

    Donghui YANC; Changhwan SEO; Bo-Young HUR


    For the first time AZ91 (MgAl9Zn1) and AM60 (MgAl6) Mg alloy foams with homogeneous pore structures were prepared successfully via melt foaming method using CaCO3 as blowing agent. It is revealed that the blowing gas to foam the melt is not CO2 but CO, which comes from liquid-solid reaction between Mg melt. The reaction temperature is more than 100℃ lower than CaCO3 decomposition, which makes Mg alloy melts foam into cellular structure much more easily in the temperature range from 690℃ to 750℃.

  14. Study on Organization and Operation Mode of SMT-MG

    LI Chunquan; YU Tao; ZHOU Dejian


    SMT-MG is a typical application of grid in electric product manufacturing. The organization and operation mode are key problems in SMT-MG. In this paper, SMT-MG is taken as research object. Its mesh three-dimensional matrix organization mode is presented. Meanwhile from operation foundation, process, environment and target four aspects, operation principles are explored. Operation mechanisms of SMT-MG such as adaptive evolution, PUSH/PULL driving, cooperation and game, feedback, regulation/control, coordination, impetus mechanism and so on are studied. Finally, the operation flow of SMT-MG is introduced.

  15. The relation between the content of Al in Mg- Al alloy and the burning point of Mg - Al alloy%Mg-Al合金中Al含量对Mg-Al合金燃点影响的实验研究

    王世俊; 王泉; 汪岘


    研究了 Mg-Al合金中Al含量对Mg-Al合金燃点的影响,实验证明了保护熔剂能够有效的防止Mg-Al合金在熔炼中Mg和Al的氧化与燃烧,且在Al含量在10%~90%的Mg-Al合金中,Al含量40%的燃点最高,而在Al含量超过80%以后Mg-Al合金不发生燃烧现象.

  16. Lipid peroxidation in the liver of rats treated with V and/or Mg in drinking water.

    Scibior, Agnieszka; Zaporowska, Halina; Niedźwiecka, Irmina


    The effect of V(5+) and Mg treatment on spontaneous and stimulated lipid peroxidation (LPO) was studied in liver supernatants obtained from outbred 5-month-old, albino male Wistar rats. The 2-month-old animals daily received deionized water to drink (control, group I); group II - water solution of NaVO(3) (SMV) at a concentration of 0.125 mg V ml(-1); group III - water solution of MgSO(4) (MS) at a concentration of 0.06 mg Mg ml(-1), group IV - water solution of SMV-MS at the same concentrations as in groups II and III for V and Mg, respectively, over a 12-week period. Three metal salts were selected as agents that may modify the LPO process (FeSO(4), NaVO(3) and MgSO(4)). V-intoxicated rats and those treated with V and Mg in combination had higher liver spontaneous malondialdehyde (MDA) formation, compared with the control and Mg-supplemented animals. In the same groups of animals the total antioxidant status (TAS) was also significantly lowered, in comparison with the control. In the supernatants obtained from the above-mentioned groups of rats a significant increase in MDA concentration was found in the presence of exogenous 30 microm FeSO(4) as well as 30, 100, 200 and 400 microm NaVO(3), compared with groups I and III. Significantly elevated MDA production was also observed in the supernatants obtained from the rats exposed to V and Mg in combination in the presence of exogenous 100 and 200 microm MgSO(4) in comparison with the control and group III as well as in the presence of exogenous 400 and 600 microm MgSO(4) compared only with group III. In vitro treatment with 1000 microm MgSO(4 )of control liver supernatants and those obtained from group III significantly enhanced MDA level, compared with spontaneous MDA formation. The two-way ANOVA indicated that the changes in the basal MDA level and in TAS in the rats at combined V and Mg application, were not due to V-Mg interaction, but resulted from independent action of V. In addition, the three-way ANOVA

  17. Efficacy of orlistat 60 mg on weight loss and body fat mass in US Army soldiers.

    Smith, Tracey J; Crombie, Aaron; Sanders, Leslee Funderburk; Sigrist, Lori D; Bathalon, Gaston P; McGraw, Susan; Young, Andrew J


    A higher body mass index is associated with exercise-related injuries and increased risk for musculoskeletal and connective tissue disorders, which are relevant to military personnel. Studies show the efficacy of orlistat 60 mg for promoting weight and body fat loss in civilians; however, its efficacy among predominantly young, male soldiers is unknown. This study's objective was to examine the effect of a 6-month, standard education-based weight-management program with and without orlistat 60 mg on changes in weight and body fat in overweight soldiers. Data were collected for this randomized, controlled trial from March 2008 to November 2010 at Fort Bragg, NC. Participants were enrolled in an education-based weight management program (n=435; 75% men) and were randomized to placebo or orlistat 60 mg, three capsules daily with meals. All participants were recommended to maintain a reduced-energy, low-fat diet. Among study completers (14% retention rate; placebo n=22, orlistat n=35) members of both groups lost significant weight from baseline (placebo -3.0±5.2 kg; orlistat -3.2±4.7 kg; Porlistat group lost fat mass (-2.5±3.9 kg; Porlistat group lost more fat mass vs the placebo group (-1.3±2.9 kg vs ?0.6±1.8 kg, respectively; POrlistat 60 mg may be an effective adjunct to an education-based weight management program in a mostly young, male soldier population.

  18. Hydrothermal Synthesis and Characterization of 3R Polytypes of Mg-Al Layered Double Hydroxides

    Budhysutanto, W.N.


    Layered Double Hydroxides (LDH) is a unique group of clays that have an anionic exchange capability. This research explored the hydrothermal method as an alternative method to synthesize Mg-Al LDH. It is a simple and more environmentally friendly compared to the conventional method of co-precipitati

  19. The High-Pressure Phase of MgB2C2

    Woerle, Michael; Fischbach, Urs; Widmer, Daniel; Krumeich, Frank; Nesper, Reinhard; Evers, Juergen; Stalder, Roland; Ulmer, Peter


    A high-pressure modification of MgB2C2 was synthesized and structurally characterized. The compound crystallizes in the orthorhombic space group Pnnm, with the lattice parameters a = 7.19633(3) angstrom, b = 4.61791(13) angstrom and c = 2.77714(8) angstrom. The compound contains heterographene B-C n

  20. Crystallographic Characteristic of Intermetallic Compounds in Al-Si-Mg Casting Alloys Using Electron Backscatter Diffraction

    ZOU Yongzhi; XU Zhengbing; HE Juan; ZENG Jianmin


    The Al-Si-Mg alloy which can be strengthened by heat treatment is widely applied to the key components of aerospace and aeronautics. Iron-rich intermetallic compounds are well known to be strongly influential on mechanical properties in Al-Si-Mg alloys. But intermetallic compounds in cast Al-Si-Mg alloy intermetallics are often misidentified in previous metallurgical studies. It was described as many different compounds, such as AlFeSi, Al8Fe2Si, Al5(Fe, Mn)3Si2 and so on. For the purpose of solving this problem, the intermetallic compounds in cast Al-Si alloys containing 0.5% Mg were investigated in this study. The iron-rich compounds in Al-Si-Mg casting alloys were characterized by optical microscope(OM), scanning electron microscope(SEM), energy dispersive X-ray spectrometer(EDS), electron backscatter diffraction(EBSD) and X-ray powder diffraction(XRD). The electron backscatter diffraction patterns were used to assess the crystallographic characteristics of intermetallic compounds. The compound which contains Fe/Mg-rich particles with coarse morphologies was Al8FeMg3Si6 in the alloy by using EBSD. The compound belongs to hexagonal system, space group P2m, with the lattice parameter a=0.662 nm, c=0.792 nm. The β-phase is indexed as tetragonal Al3FeSi2, space group I4/mcm, a=0.607 nm and c=0.950 nm. The XRD data indicate that Al8FeMg3Si6 and Al3FeSi2 are present in the microstructure of Al-7Si-Mg alloy, which confirms the identification result of EBSD. The present study identified the iron-rich compound in Al-Si-Mg alloy, which provides a reliable method to identify the intermetallic compounds in short time in Al-Si-Mg alloy. Study results are helpful for identification of complex compounds in alloys.

  1. Intrinsic Conductivity in Magnesium-Oxygen Battery Discharge Products: MgO and MgO2

    Smith, Jeffrey G.; Naruse, Junichi; Hiramatsu, Hidehiko


    O, the equilibrium concentration of carriers in MgO2 is low, and moderate-to-poor mobility further limits conductivity. If equilibrium behavior is realized, then we conclude that (i) sluggish charge transport in MgO or MgO2 will limit battery performance when these compounds cover the cathode support and (ii) what...

  2. Magnetic translation groups as group extension

    Florek, Wojciech


    Extensions of a direct product T of two cyclic groups Z_n1 and Z_n2 by an Abelian (gauge) group G with the trivial action of T on G are considered. All possible (nonequivalent) factor systems are determined using the Mac Lane method. Some of resulting groups describe magnetic translation groups. As examples extensions with G=U(1) and G=Z_n are considered and discussed.

  3. The structure of ? precipitates in Mg-Zn-Y alloys

    Singh, Alok; Rosalie, Julian M.; Somekawa, Hidetoshi; Mukai, Toshiji


    It is shown here by high-resolution electron microscopy that the structure of rod-like ? precipitates perpendicular to the basal planes of the magnesium matrix in Mg-Zn-Y alloys consist of complex domains at nanoscale. These domains can be recognized to be those of monoclinic Mg4Zn7 phase and hexagonal Laves phase MgZn2 with axial orientations ? . Due to disorder, often complete unit cells of the Mg4Zn7 structure cannot be recognized. Inside a domain of Mg4Zn7, the structure may locally transform to that of MgZn2. The structure of both the phases are composed of similar units of icosahedral coordinations. Maintaining the above axial orientation, the Mg4Zn7 can exhibit two orientation relationships with the matrix, ? or ? . The hexagonal MgZn2 forms in the monoclinic Mg4Zn7 in two different orientations, related to rhombic units (with angle ∼72°) in the Mg4Zn7 unit cell. With the common axial relationship given above, these two orientation relationships can be given as ? or ? . One of these two variants forms a known orientation relationship ? , ? with the matrix. The structure of the MgZn2 was found to be modified by the ordering of zinc layers perpendicular to the hexagonal axis.

  4. Interaction of hydrogen with an Mg-Al alloy (poster)

    Andreasen, A.; Andreasen, J.W.; Burkarl, R.;


    The properties of magnesium as a hydrogen storage medium may be positively altered by the addition of Al: thermodynamic properties, kinetics and heat transfer of the hydride bed can be improved. The interaction of hydrogen with a Mg-Al alloy pre-exposedto air has been studied with in-situ time...... energy for dehydrogenation of the Mg-Al alloy is found to be approx. 160 kJ/mol. This is not significantly higher than for pure and fully activated Mg.Furthermore, it is found that Mg-Al is hydrogenated to MgH2 + Al and upon dehydrogenation a Mg-Al alloy is reformed. Pure Mg is not observed during...

  5. Group Dynamic Processes in Email Groups

    Alpay, Esat


    Discussion is given on the relevance of group dynamic processes in promoting decision-making in email discussion groups. General theories on social facilitation and social loafing are considered in the context of email groups, as well as the applicability of psychodynamic and interaction-based models. It is argued that such theories may indeed…

  6. Interagency mechanical operations group numerical systems group



    This report consists of the minutes of the May 20-21, 1971 meeting of the Interagency Mechanical Operations Group (IMOG) Numerical Systems Group. This group looks at issues related to numerical control in the machining industry. Items discussed related to the use of CAD and CAM, EIA standards, data links, and numerical control.

  7. AREVA group overview; Presentation du groupe AREVA



    This document presents the Group Areva, a world nuclear industry leader, from a financial holding company to an industrial group, operating in two businesses: the nuclear energy and the components. The structure and the market of the group are discussed, as the financial assets. (A.L.B.)

  8. Enhanced post-annealing stability of perpendicular Ta/CoFeB/Mg/MgO multilayers by inhibiting Ta diffusion

    Li, Xu-Jing; Jiang, Shao-Long; Zhang, Jing-Yan; Liu, Qian-Qian; Liu, Yi-Wei; Zhao, Jian-Cheng [Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083 (China); Wu, Zheng-Long [Analytical and Testing Center, Beijing Normal University, Beijing 100875 (China); Feng, Chun, E-mail: [Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083 (China); Li, Ming-Hua [Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083 (China); Yu, Guang-Hua, E-mail: [Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083 (China)


    Graphical abstract: To reveal the underlying mechanism of Mg influence on the enhanced post-annealing stability of perpendicular Ta/CoFeB/Mg/MgO multilayers, the X-ray photoelectron spectroscopy analysis have been performed. It is found that a certain amount of Mg interlayer at the CoFeB/MgO interface could prevent the Ta oxidation to some extent due to the oxygen deficit MgO{sub x} (x < 1), and consequently lower the diffusion motivation of Ta from the bottom layer to the CoFeB/MgO interfaces to some extent during the annealing process. The prevention of Ta diffusion realizes the effective hybridization of Fe and O at the CoFeB/MgO interface and maintains interfacial magnetic anisotropy (K{sub CoFeB/MgO}). As a result, the perpendicular magnetic anisotropy at high annealing temperatures was maintained. - Highlights: • High annealing stability of perpendicular Ta/CoFeB/Mg/MgO multilayers was realized. • X-ray photoelectron spectroscopy analysis has been performed to explore the reasons. • The prevention of Ta diffusion was realized by introducing Mg at the CoFeB/MgO interface. - Abstracts: To reveal the underlying mechanism of Mg influence on the enhanced post-annealing stability of perpendicular Ta/CoFeB/Mg/MgO multilayers, the X-ray photoelectron spectroscopy analysis has been performed. It is found that a certain amount of Mg interlayer at the CoFeB/MgO interface could prevent the Ta oxidation, and consequently lower the diffusion motivation of Ta from the bottom layer to the CoFeB/MgO interfaces to some extent in the annealing process. The prevention of Ta diffusion realizes the effective hybridization of Fe and O at the CoFeB/MgO interface and maintains interfacial magnetic anisotropy (KCoFeB/MgO). As a result, the perpendicular magnetic anisotropy at high annealing temperatures is maintained.

  9. Pre-emptive 8 mg dexamethasone and 120 mg etoricoxib for pain prevention after periodontal surgery: A randomised controlled clinical trial

    Kranti Konuganti


    Full Text Available Several anti-inflammatory drugs have been used to reduce pain and discomfort after periodontal surgeries. This study evaluates the efficacy of using etoricoxib and dexamethasone for pain prevention after open-flap debridement surgery. In this study, 60 patients who were undergoing open flap debridment surgery were randomly assigned to receive a single dose preoperative medication 1 hour prior to surgery. The patients were divided into three groups. In Group 1, 20 patients were given placebo drug orally. In Group 2, 20 patients were given 8 mg Dexamethasone orally and in Group 3, 20 patients were given 120 mg Etoricoxib orally. Patients were instructed to complete a pain diary hourly for the first 8 hours after each surgery and three times a day on the following 3 days. The four point verbal rating scale (VRS 4 and Numerical rate scale were used to assess discomfort. Post-operative Assessment of Pain and Discomfort showed that persistent discomfort and pain were found to be more in the placebo group compared to dexamethasone and etoricoxib group. The adoption of a preemptive medication protocol using either etoricoxib or dexamethasone may be considered effective for pain and discomfort prevention after open-flap debridement surgeries.

  10. Thermodynamic description of the Mg-Nd-Zn ternary system

    Qi, H.Y.; Huang, G.X.; Bo, H.; Xu, G.L. [School of Material Science and Engineering, Central South University, Changsha, Hunan 410083 (China); Liu, L.B., E-mail: [School of Material Science and Engineering, Central South University, Changsha, Hunan 410083 (China); Education Ministry Key Laboratory of Non-ferrous Materials Science and Engineering, Central South University, Changsha, Hunan 410083 (China); Center of Phase Diagram and Materials Design and Manufacture, Changsha, Hunan 410083 (China); Jin, Z.P. [School of Material Science and Engineering, Central South University, Changsha, Hunan 410083 (China); Education Ministry Key Laboratory of Non-ferrous Materials Science and Engineering, Central South University, Changsha, Hunan 410083 (China); Center of Phase Diagram and Materials Design and Manufacture, Changsha, Hunan 410083 (China)


    A thermodynamic description of the Mg-Nd-Zn system was developed by means of the CALPHAD (CALculation of PHAse Diagrams) method. The constituent binary systems Mg-Nd and Nd-Zn were re-optimized based on the experimental phase equilibria and thermodynamic properties available in the literature. Combining with the thermodynamic parameters of the Mg-Zn system cited from the reference, the Mg-Nd-Zn ternary system was evaluated. The Gibbs energies of the solution phases (liquid, BCC{sub A}2, DHCP, HCP{sub A}3 and HCP{sub Z}n) were described by the subregular solution model with the Redlich-Kister polynomial function, and those of the stoichiometric compounds, Nd{sub 2}Zn{sub 17}, NdZn{sub 11H}, NdZn{sub 11L}, Nd{sub 3}Zn{sub 22}, Nd{sub 13}Zn{sub 58}, Nd{sub 3}Zn{sub 11}, NdZn{sub 3}, NdZn{sub 2} and Mg{sub 2}Nd, were described by the sublattice model. The compounds Mg{sub 3}Nd and Mg{sub 41}Nd{sub 5} in the Mg-Nd-Zn system were treated as the formulae (Mg, Zn){sub 3}(Mg, Nd) and (Mg, Nd, Zn){sub 41}(Mg, Nd){sub 5}. The order-disorder transition between BCC{sub B}2 and BCC{sub A}2 phases was treated using a two-sublattice model (Mg, Nd, Zn){sub 0.5}(Mg, Nd, Zn){sub 0.5}. Based on experimental data, four stable ternary compounds {tau}{sub 1}(Mg{sub 7}Nd{sub 1}Zn{sub 12}), {tau}{sub 2}(Mg{sub 7}Nd{sub 2}Zn{sub 11}), {tau}{sub 3}(Mg{sub 6}Nd{sub 1}Zn{sub 3}) and {tau}{sub 4}(Mg{sub 6}Nd{sub 3}Zn{sub 11}) were taken into consideration in this system. A set of self-consistent thermodynamic parameters of the Mg-Nd-Zn system was obtained. Projection of the liquidus surface, selected vertical and isothermal sections were calculated using the proposed thermodynamic description. Comprehensive comparisons between the calculated and measured phase diagrams show that almost all the accurate experimental information is satisfactorily accounted for by the present thermodynamic description.

  11. About group digital signatures

    Adriana Cristina Enache


    ...).A group digital signature is a digital signature with enhanced privacy features that allows members of a given group to anonymously sign messages on behalf of the group, producing a group signature...

  12. Balancing the Osteogenic and Antibacterial Properties of Titanium by Codoping of Mg and Ag: An in Vitro and in Vivo Study.

    Zhao, Yaochao; Cao, Huiliang; Qin, Hui; Cheng, Tao; Qian, Shi; Cheng, Mengqi; Peng, Xiaochun; Wang, Jiaxin; Zhang, Yin; Jin, Guodong; Zhang, Xianlong; Liu, Xuanyong; Chu, Paul K


    To simultaneously enhance the osteogenic and antibacterial properties of titanium, we introduced magnesium (Mg), silver (Ag), or both by using the plasma immersion ion implantation (PIII) technique, producing three PIII sample groups, namely, Mg-doped titanium (Mg-PIII), Ag-doped titanium (Ag-PIII), and Mg and Ag codoped titanium (Mg/Ag-PIII). The in vitro antibacterial efficacy of Mg/Ag-PIII group was about 7-10% higher than that of Ag-PIII. In vitro and in vivo results demonstrated that osteogenic property of Mg/Ag PIII group was better than that of Ag-PIII or Mg-PIII. It was believed that the galvanic effects between Mg and Ag NPs played a key role in facilitating the release of Mg but reducing the release of silver, answering for the selective performances of the Mg/Ag-PIII group over bacterial and mammalian cells. This study demonstrated that the integration of multiple functional elements could be realized by the dual-source PIII technique, and in this case, the antibacterial properties and osteogenic property of titanium could be balanced.

  13. Full-potential KKR-calculations for MgO and divalent impurities in MgO

    Baranov, A. N.; Stepanyuk, V. S.; Hergert, W.; Katsnelson, A. A.; Settels, A.; Zeller, R.; Dederichs, P. H.


    We present a detailed investigation of bulk properties of MgO and lattice relaxations around divalent impurities in MgO by means of the full-potential Korringa-Kohn-Rostoker Green's function method. The local-density approximation and the perturbative generalized gradient corrections are used to calculate the lattice constant and bulk modulus of MgO. We obtain a very good description of the ground properties of MgO. Lattice relaxations around divalent impurities in MgO are determined using an...

  14. Superior MgH2 Kinetics with MgO Addition: A Tribological Effect

    Kondo-Francois Aguey-Zinsou


    Full Text Available The kinetics of hydrogen absorption/desorption in magnesium can be improved without any catalysis assistance and MgO was found to be more effective than the best catalyst reported so far, i.e., Nb2O5. Herein, a quantitative analysis of the hydrogen kinetics in magnesium modified with MgO was performed in order to identify possible rate controlling mechanisms. While hydrogen absorption was found to be diffusion controlled as commonly reported, hydrogen desorption evolved from nucleation and growth to an interface controlled process depending on the desorption temperature. Comparison with the effect of Nb2O5 indicates that similar rate limiting steps occur regardless of the oxide additive. These findings are reconciled by considering the tribological effect of solid oxide additives, as a correlation between oxides electronegativity and improvement in hydrogen kinetics was found. Such a correlation clearly highlights the mechanical effect of solid oxides in facilitating the grinding and stabilisation of small magnesium particles for efficient and fast hydrogen kinetics.

  15. From $^{27}$Mg to ${33}$Mg transition to the "Island of inversion"

    Yordanov, Deyan

    Since introduced in nuclear physics, the concept of shell structure and magic numbers has governed our understanding of nuclear matter in atomic nuclei close to stability. Nuclear species with a magic number of protons and/or neutrons are known to be more stable and close to spherical in shape. Experimental studies of 30Ne, 31Na and 32Mg, systems with a closed neutron sd shell (N=20), provide evidence for a ground-state deformation in these nuclei. The observed phenomenon is understood as an inversion of the normal spherical ground-state configuration, expected according to the traditional shell model, with deformed states governed by particle-hole excitations over the N=20 shell gap. The properties of nuclei in this Island of inversion are of particular importance for the theoretical modeling of the region. The present doctoral dissertation reports on the first determination of the nuclear ground-state spins and magnetic moments of 31,33Mg, obtained by means of laser spectroscopy in combination with nuclear...

  16. Structure of Mg$_n$ and Mg$_n^+$ clusters up to n=30

    Janecek, Stefan


    We present structure calculations of neutral and singly ionized Mg clusters of up to 30 atoms, as well as Na clusters of up to 10 atoms. The calculations have been performed using density functional theory (DFT) within the local (spin-)density approximation, ion cores are described by pseudopotentials. We have utilized a new algorithm for solving the Kohn-Sham equations that is formulated entirely in coordinate space and, thus, permits straightforward control of the spatial resolution. Our numerical method is particularly suitable for modern parallel computer architectures; we have thus been able to combine an unrestricted simulated annealing procedure with electronic structure calculations of high spatial resolution, corresponding to a plane-wave cutoff of 954eV for Mg. We report the geometric structures of the resulting ground-state configurations and a few low-lying isomers. The energetics and HOMO-LUMO gaps of the ground-state configurations are carefully examined and related to their stability properties...

  17. Clustering effects in 48Cr composite nuclei produced via 24Mg + 24Mg reaction

    Cinausero M.


    Full Text Available In the framework of studying clustering effects in N=Z light nuclei, an experiment was carried out to get information on the properties of the 48Cr composite nuclei produced via the 24Mg +24Mg reaction. In particular, the study regards the 48Cr at 60 MeV of excitation energy where a resonance with a narrow width (170 KeV has been found by measuring the elastic and anelastic channels. To determine the deformation of this state, evaporative Light Charged Particles (LCP are measured and compared to the Statistical Model (SM predictions, which are very sensitive to nuclear deformation. The experiment was performed at LNL using the 8ĒLP apparatus to select LCPs and a Parallel Plate Avalanche Counter (PPAC system to detect the Evaporation Residues (ER. Preliminary results on the measurements of ER – LCP and LCP – LCP angular correlations are presented which indicate the presence of a very large deformation.The analysis will proceed with the extraction of the LCP energy spectra and with the angular correlations for high multiplicity channels to determine the deformation.

  18. Effect of Hongteng Yangwei decoction on serum MG7-Ag, PG, TPS and OPN level of patients with gastric cancer

    Yan-Hua Fei; Nan-Yao Wang; Qiong Wang


    Objective:To explore Hongteng Yangwei decoction on patients with gastric cancer serum associated antigen (MG7-Ag), pepsin (PG), tissue polypeptide specific antigen (TPS) and osteopontin (OPN) levels, so as to provide the basis for treatment of gastric cancer.Method:From April 2012 to April 2015 due to gastric cancer received treatment of 90 cases of patients into the study, and then balance divided into group A, group B, group C, 30 cases of each group. Group A patients took Hongteng Yangwei decoction treatment, group B taking Wei Fu Chun pills treatment, group C with western medicine treatment. Before treatment for all patients, after January, the treatment of February after the detection, the main indicators of detection MG7-Ag, PG, TPS and OPN.Result:Level comparison MG7-Ag and SFAS in patients who received treatment before treatment, 1 month, 2 months of serum MG7-Ag detection after treatment patients were lower than those before treatment, difference had statistical significance: group A, patients taking Yangwei decoction treatment group C, B group of patients, the difference had no statistical significance. Treatment for 1 month, 2 months, a group of patients with serum PG levels higher than before treatment, and higher than that of B and C groups of patients, the differences were statistically significant. Serum levels of OPN and TPS level was significantly lower than that before treatment, difference was statistically significant, a group of patients with serum OPN, TPS level lower than B and C groups of patients, the difference was statistically significant.Conclusion:For the patients with gastric cancer Hongteng Yangwei decoction, serum levels of OPN and TPS decreased significantly. Serum PG increased, effect was significant, the patient serum MG7-Ag level with the western medicine, Wei Fu Chun pills in efficacy had no significant change, should be further in-depth study.

  19. Cathepsin B antisense oligodeoxynucleotide suppresses invasive potential of MG-63 cells

    He Maolin; Xiao Zengming; Li Shide; Chen Anmin


    Objective To study the biological effects of cathepsin B phosporotbioated antisense oligodeoxynucleotide on human osteosarcoma cell line MG-63 after transfection. Methods A 18-mer phosphorothioate antisense oligodeoxynucleotide (ASODN) targeted against the cathepsin B mRNA was transfected into the human osteosarcoma cell line MG-63 by lipofectamine 2000. The sense and nonsense oligodeoxynucleotides to cathepsin B and blank vector were used as controls. The expression of cathepsin B mRNA was examined by RT-PCR and the expression of cathepsin B was examined by Western blot. The invasive capability of MG-63 cells was evaluated by the boydern chamber assay. Results The expression of cathcpsin B was obviously inhibited in antlsense oligodeoxynucleotide treated cells compared with the control cells. The number of invading MG-63 cells was significantly lower in the ASODN-treated groups than that in the control groups. Conclusion The cathepsin B ASODN significantly inhibits the expression of cathepsin B and invasive ability of MG-63 cell in osteosarcoma.

  20. Thermodynamic re-optimization of the Cu-Mg-Sn system at the Cu-Mg side

    Miettinen J.


    Full Text Available Thermodynamic description of the ternary Cu-Mg-Sn system at its Cu-Mg side is presented. The thermodynamic parameters of the binary sub-systems, Cu-Mg, Cu-Sn and Mg-Sn, are taken from the earlier SGTE-based assessments (modifying the Mg-Sn description slightly and those of the Cu-Mg-Si system are optimized in this study using the experimental thermodynamic and phase equilibrium data. The solution phases of the systems are described with the substitutional solution model and the intermetallic Cu2Mg compound (Laves C15, treated as simple semi-stoichiometric phases of the (A,BpCq type, is described with the twosublattice model. The present ternary description is valid for tin contents up to 45 wt% (xSn≈0.30.

  1. Recycling of AZ31 Mg alloy with high purity Mg deposition layer by hot working (solid recycling)

    Chino, Y.; Mabuchi, M. [Inst. for Structural and Engineering Materials, National Inst. of Advanced Industrial Science and Technology, Nagoya (Japan); Yamamoto, A.; Iwasaki, H.; Tsubakino, H. [Div. of Materials Science and Engineering, Graduate School of Himeji Inst. of Tech., Himeji (Japan)


    Solid recycling of AZ31 Mg alloy with vapor deposition coating layer of high purity Mg was evaluated. In the open die forging experiments, two AZ31 Mg alloy specimens with the pure Mg layer were sufficiently bonded by forging at 673 K. Furthermore, the Al and Zn of the AZ31 substrate diffused up to the center of the pure Mg layer. By the theoretical analysis, it is suggested that the grain boundary diffusion enhanced by grain refinement due to hot forging contributes to the solid state bonding of the specimens. Also, the solid recycled specimen was fabricated from the AZ31 Mg substrate with pure Mg layer by hot extrusion at 673 K. The solid recycled specimen showed almost the same tensile properties as the virgin extruded specimen. This is probably related not only to the grain boundary diffusion but also severe plastic deformation by hot extrusion. (orig.)

  2. Quasi-quantum groups from strings

    Jureit, J -H


    Motivated by string theory on the orbifold ${\\cal M}/G$ in presence of a Kalb-Ramond field strength $H$, we define the operators that lift the group action to the twisted sectors. These operators turn out to generate the quasi-quantum group $D_{\\omega}[G]$, introduced in the context of conformal field theory by R. Dijkgraaf, V. Pasquier and P. Roche, with $\\omega$ a 3-cocycle determined by a series of cohomological equations in a tricomplex combining de Rham, \\u{C}ech and group cohomologies. We further illustrate some properties of the quasi-quantum group from a string theoretical point of view.

  3. Corrosion behavior of Mg/graphene composite in aqueous electrolyte

    Selvam, M. [Centre for Nano Science and Technology, KS Rangasamy College of Technology, Tiruchengode, 637215, Tamil Nadu (India); Saminathan, K., E-mail: [Centre for Nano Science and Technology, KS Rangasamy College of Technology, Tiruchengode, 637215, Tamil Nadu (India); Siva, P. [Centre for Nano Science and Technology, KS Rangasamy College of Technology, Tiruchengode, 637215, Tamil Nadu (India); Saha, P. [Department of Ceramic Engineering, National Institute of Technology, Rourkela, India-769008 (India); Rajendran, V. [Centre for Nano Science and Technology, KS Rangasamy College of Technology, Tiruchengode, 637215, Tamil Nadu (India)


    In the present work, the electrochemical corrosion behavior of magnesium (Mg) and thin layer graphene coated Mg (Mg/graphene) are studied in different salt electrolyte such as NaCl, KCl and Na{sub 2}SO{sub 4}. The phase structure, crystallinity, and surface morphology of the samples are investigated using X-ray diffraction (XRD) analysis, scanning electron microscopy coupled with energy dispersive X-ray analysis (SEM/EDAX), and Raman spectroscopy techniques. The electrochemical corrosion behavior of the Mg and graphene coated Mg are also investigated using Electrochemical Impedance Spectroscopy (EIS) analysis. The tafel plot reveals that the corrosion of Mg drastically drops when coated with thin layer graphene (Mg/graphene) compared to Mg in KCl electrolyte. Moreover, the EIS confirms that Mg/graphene sample shows improve corrosion resistance and lower corrosion rate in KCl solution compare to all other electrolytes studied in the present system. - Highlights: • The corrosion behavior of magnesium alloy (AZ91) was investigated in three different electrolyte solution. • To study the anti-corrosion behavior of graphene coated with magnesium alloy. • To improve the corrosion resistance for magnesium alloy. • Nyquist plots confirms that MgG shows better corrosion resistance and lower corrosion rate in KCl solution.

  4. Interaction of hydrogen with an Mg-Al alloy (poster)

    Andreasen, A.; Andreasen, J.W.; Burkarl, R.


    The properties of magnesium as a hydrogen storage medium may be positively altered by the addition of Al: thermodynamic properties, kinetics and heat transfer of the hydride bed can be improved. The interaction of hydrogen with a Mg-Al alloy pre-exposedto air has been studied with in-situ time...... energy for dehydrogenation of the Mg-Al alloy is found to be approx. 160 kJ/mol. This is not significantly higher than for pure and fully activated Mg.Furthermore, it is found that Mg-Al is hydrogenated to MgH2 + Al and upon dehydrogenation a Mg-Al alloy is reformed. Pure Mg is not observed during...... dehydrogenation, suggesting that the formation of Mg-Al is fast compared to the liberation of hydrogen fromMgH2. From thermodynamical calculations using the semi-empirical Miedema model a slightly lower heat of hydride formation is found. Based on comparison with previous experiments on Mg exposed to air...

  5. Neutron spectroscopy of gamma-MgH2

    Kolesnikov, Alexander; Antonov, Vladimir; Efimchenko, Vadim; Granroth, Garrett; Klyamkin, S. N.; Levchenko, A. V.; Sakharov, Michael; Ren, Yang; Ramirez-Cuesta, Timmy


    Under ambient conditions, magnesium dihydride exists in two forms, alpha-MgH2 (the most stable modification) and gamma-MgH2 (a less stable modification). The alpha-phase partly transforms to gamma-MgH2 in the course of ball-milling and under high pressure and temperature. Due to the high hydrogen content of 7.6 wt.%, MgH2 has been intensively studied as a prospective material for hydrogen storage. By exposing of alpha-MgH2 to a pressure of 5 GPa and temperature 840 K, we prepared a sample, in which about 60% of the alpha-MgH2 was transformed to gamma-MgH2. We have measured inelastic neutron scattering (INS) spectra of both the high pressure treated MgH2 and starting alpha-MgH2, and extracted the spectrum for gamma-MgH2. The differences between the INS spectra and their agreement with the first-principles calculations for these compounds will be discussed.

  6. Mg isotope fractionation during microbe-mineral interactions

    Kim, Insu; Ryu, Jong-sik; Lee, Kwang-sik; Lee, Dongho


    Magnesium is involved in various biogeochemical processes important to the global climate change over geological time-scale. Mg isotopes allow us to directly trace the Mg cycle in the Earth's surface but the factors controlling Mg isotopic compositions have not fully understood yet. Here, we conducted a batch experiment using two bacterial species (Shewanella putrefaciens and Burkholderia fungorum) and three major Mg-bearing minerals (biotite, dolomite and hornblende). All elemental concentrations increased by 336 h and then reached to steady-state values, of which Mg concentrations varied depending on minerals and bacterial species. This result indicates that the mineral dissolution is affect by the presence of microbes, which either provide organic acids or attach onto mineral surface. The Mg isotopic compositions of initial minerals biotite, dolomite and hornblende are -0.35o of biotite, -0.99o of dolomite, and -0.24o of hornblende, in δ26Mg. Similarly, δ26Mg values increased by 336 h and reached to steady-state values, which also varied with minerals and microbes. During dissolution of three minerals, the light isotope of Mg is preferentially incorporated into the dissolved phases and then the dissolved δ26Mg values become consistent with those of minerals with the time.

  7. Low-energy radioactive ion beam production of 22Mg

    Duy, N. N.; Kubono, S.; Yamaguchi, H.; Kahl, D.; Wakabayashi, Y.; Teranishi, T.; Iwasa, N.; Kwon, Y. K.; Khiem, L. H.; Kim, Y. H.; Song, J. S.; Hu, J.; Ayyad, Y.


    The 22Mg nucleus plays an important role in nuclear astrophysics, specially in the 22Mg(α,p)25Al and proton capture 22Mg(p,γ)23Al reactions. It is believed that 22Mg is a waiting point in the αp-process of nucleosynthesis in novae. We proposed a direct measurement of the 22Mg+α resonance reaction in inverse kinematics using a radioactive ion (RI) beam. A 22Mg beam of 3.73 MeV/u was produced at CRIB (Center for Nuclear Study (CNS) low-energy RI Beam) facility of the University of Tokyo located at RIKEN (Japan) in 2011. In this paper we present the results about the production of the 22Mg beam used for the direct measurement of the scattering reaction 22Mg(α,α)22Mg, and the stellar reaction 22Mg(α,p)25Al in the energy region concerning an astrophysical temperature of T9=1-3 GK.

  8. Laser multi-layer cladding of Mg-based alloys

    陈长军; 王东生; 王茂才


    By laser multi-layer cladding using a pulsed Nd-YAG irradiation the thickness of the cladding zone Mg-based alloys(ZM2 and ZM5) can reach about 1. 0 mm. The microstructure of the substrate and the cladding zone wasstudied using optical microscope, scanning electron microscopy(SEM), X-ray diffractometry(XRD) and micro hard-ness analysis. It is observed that constituent of ZM5 alloy is δ+Mg17 Al12, that of ZM2 alloy is α+MgZn+Mg9Ce.That of cladding layer ZM2 alloy(L-ZM2) is Mg+ Mg2 Zn11 +MgCe; while that of the cladding layer ZM5 alloy(L-ZM5) is Mg+Mg32 (Al, Zn)49. The hardness of the cladding area can be increased to values above HV127. Veryfine uniform microstructure and the produced new phases of nanometer/sub-micrometer order were obtained. Now,many repaired Mg-based alloy components have been passed by flying test in outside field.

  9. Introduction to Sporadic Groups

    Luis J. Boya


    Full Text Available This is an introduction to finite simple groups, in particular sporadic groups, intended for physicists. After a short review of group theory, we enumerate the 1+1+16=18 families of finite simple groups, as an introduction to the sporadic groups. These are described next, in three levels of increasing complexity, plus the six isolated ''pariah'' groups. The (old five Mathieu groups make up the first, smallest order level. The seven groups related to the Leech lattice, including the three Conway groups, constitute the second level. The third and highest level contains the Monster group M, plus seven other related groups. Next a brief mention is made of the remaining six pariah groups, thus completing the 5+7+8+6=26 sporadic groups. The review ends up with a brief discussion of a few of physical applications of finite groups in physics, including a couple of recent examples which use sporadic groups.

  10. Effects of Mg substitution on the structural and magnetic properties of Co0.5Ni0.5-x Mg x Fe2O4 nanoparticle ferrites

    R, M. Rosnan; Z, Othaman; R, Hussin; Ali, A. Ati; Alireza, Samavati; Shadab, Dabagh; Samad, Zare


    In this study, nanocrystalline Co-Ni-Mg ferrite powders with composition Co0.5Ni0.5-x Mg x Fe2O4 are successfully synthesized by the co-precipitation method. A systematic investigation on the structural, morphological and magnetic properties of un-doped and Mg-doped Co-Ni ferrite nanoparticles is carried out. The prepared samples are characterized using x-ray diffraction (XRD) analysis, Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), and vibrating sample magnetometry (VSM). The XRD analyses of the synthesized samples confirm the formation of single-phase cubic spinel structures with crystallite sizes in a range of ˜ 32 nm to ˜ 36 nm. The lattice constant increases with increasing Mg content. FESEM images show that the synthesized samples are homogeneous with a uniformly distributed grain. The results of IR spectroscopy analysis indicate the formation of functional groups of spinel ferrite in the co-precipitation process. By increasing Mg2+ substitution, room temperature magnetic measurement shows that maximum magnetization and coercivity increase from ˜ 57.35 emu/g to ˜ 61.49 emu/g and ˜ 603.26 Oe to ˜ 684.11 Oe (1 Oe = 79.5775 A·m-1), respectively. The higher values of magnetization M s and M r suggest that the optimum composition is Co0.5Ni0.4Mg0.1Fe2O4 that can be applied to high-density recording media and microwave devices. Project supported by the Ibnu Sina Institute for Scientific and Industrial Research, Physics Department of Universiti Teknologi Malaysia and the Ministry of Education Malaysia (Grant Nos. Q.J130000.2526.04H65).

  11. Phase Equilibria, Crystal Structure and Hydriding/Dehydriding Mechanism of Nd4Mg80Ni8 Compound.

    Luo, Qun; Gu, Qin-Fen; Zhang, Jie-Yu; Chen, Shuang-Lin; Chou, Kuo-Chih; Li, Qian


    In order to find out the optimal composition of novel Nd-Mg-Ni alloys for hydrogen storage, the isothermal section of Nd-Mg-Ni system at 400 °C is established by examining the equilibrated alloys. A new ternary compound Nd4Mg80Ni8 is discovered in the Mg-rich corner. It has the crystal structure of space group I41/amd with lattice parameters of a = b = 11.2743(1) Å and c = 15.9170(2) Å, characterized by the synchrotron powder X-ray diffraction (SR-PXRD). High-resolution transmission electron microscopy (HR-TEM) is used to investigate the microstructure of Nd4Mg80Ni8 and its hydrogen-induced microstructure evolution. The hydrogenation leads to Nd4Mg80Ni8 decomposing into NdH2.61-MgH2-Mg2NiH0.3 nanocomposites, where the high density phase boundaries provide a great deal of hydrogen atoms diffusion channels and nucleation sites of hydrides, which greatly enhances the hydriding/dehydriding (H/D) properties. The Nd4Mg80Ni8 exhibits a good cycle ability. The kinetic mechanisms of H/D reactions are studied by Real Physical Picture (RPP) model. The rate controlling steps are diffusion for hydriding reaction in the temperature range of 100 ~ 350 °C and surface penetration for dehydriding reaction at 291 ~ 347 °C. In-situ SR-PXRD results reveal the phase transformations of Mg to MgH2 and Mg2Ni to Mg2NiH4 as functions of hydrogen pressure and hydriding time.

  12. Phase Equilibria, Crystal Structure and Hydriding/Dehydriding Mechanism of Nd4Mg80Ni8 Compound

    Luo, Qun; Gu, Qin-Fen; Zhang, Jie-Yu; Chen, Shuang-Lin; Chou, Kuo-Chih; Li, Qian


    In order to find out the optimal composition of novel Nd-Mg-Ni alloys for hydrogen storage, the isothermal section of Nd-Mg-Ni system at 400 °C is established by examining the equilibrated alloys. A new ternary compound Nd4Mg80Ni8 is discovered in the Mg-rich corner. It has the crystal structure of space group I41/amd with lattice parameters of a = b = 11.2743(1) Å and c = 15.9170(2) Å, characterized by the synchrotron powder X-ray diffraction (SR-PXRD). High-resolution transmission electron microscopy (HR-TEM) is used to investigate the microstructure of Nd4Mg80Ni8 and its hydrogen-induced microstructure evolution. The hydrogenation leads to Nd4Mg80Ni8 decomposing into NdH2.61-MgH2-Mg2NiH0.3 nanocomposites, where the high density phase boundaries provide a great deal of hydrogen atoms diffusion channels and nucleation sites of hydrides, which greatly enhances the hydriding/dehydriding (H/D) properties. The Nd4Mg80Ni8 exhibits a good cycle ability. The kinetic mechanisms of H/D reactions are studied by Real Physical Picture (RPP) model. The rate controlling steps are diffusion for hydriding reaction in the temperature range of 100 ~ 350 °C and surface penetration for dehydriding reaction at 291 ~ 347 °C. In-situ SR-PXRD results reveal the phase transformations of Mg to MgH2 and Mg2Ni to Mg2NiH4 as functions of hydrogen pressure and hydriding time.

  13. Comparison of beclomethasone dipropionate (2 and 3 mg) and prednisolone sodium phosphate enemas (30 mg) in the treatment of ulcerative proctitis. An adrenocortical approach.

    Mulder, C J; Endert, E; van der Heide, H; Houthoff, H J; Wiersinga, W; Wiltink, E H; Tytgat, G N


    Twenty-three patients with attacks of distal ulcerative colitis were treated randomly with either 2 or 3 mg of topically administered beclomethasone dipropionate (BDP) or 30 mg of prednisolone sodium phosphate (PP). The effect of the steroid enemas on adrenocortical function was assessed by ACTH tests, which were performed before and after treatment. Endoscopic, clinical and histological scores were comparable in the three treatment groups in this pilot trial. Fasting cortisol in the PP group decreased significantly from 0.47 +/- 0.12 mumol/l before to 0.22 +/- 0.14 mumol/l (P less than 0.05) after therapy; in the BDP group no significant changes were found. Urinary cortisol excretion in the PP group was not detectable after therapy; in the BDP group no changes were found. It is concluded that in the topical treatment of ulcerative colitis, BDP may be preferable to PP because it exerts a promising anti-inflammatory action without affecting adrenocortical function.

  14. Thermodynamic modeling of the Ba - Mg binary system

    Ren, Xin; Li, Changrong; Du, Zhenmin; Guo, Cuiping; Chen, Sicheng [Univ. of Science and Technology, Beijing (China). School of Materials Science and Engineering


    On the basis of the thermochemical and phase equilibrium experimental data, the phase diagram of the Ba - Mg binary system has been assessed by means of the calculation of phase diagrams technique. The liquid phase is of unlimited solubility and modeled as a solution phase using the Redlich-Kister equation. The intermetallic compounds, Mg{sub 17}Ba{sub 2}, Mg{sub 23}Ba{sub 6} and Mg{sub 2}Ba, with no solubility ranges are treated as strict stoichiometric compounds with the formula Mg{sub m} Ba{sub n}. Two terminal phases, BccBa and HcpMg, are kept as solution phases, since the solubilities of the two phases are of considerable importance. After optimization, a set of self-consistent thermodynamic parameters has been obtained. The calculated values agree well with the available experimental data.

  15. Mg-ion indiffusion of lithium niobate single crystal fiber

    阙文修; 姚熹; 霍玉晶


    A core-cladding waveguide structure of lithium niobate single crystal fiber with different refractive index profiles has been obtained by using an Mg-ion indiffusion process. The propagation loss of the dadded crystal fiber is measured to be 14 times as low as that of the undadded crystal fibers. Mechanisms of Mg-ion indiffusion and reasons of lattice distortion are analyzed and discussed. It is found by X-ray diffraction analysis as well as scanning electron microscopy that MgO-rich layer in the magnesium diffused surface exhibits the crystal structure of a new compound from the Li-Mg-Nb-O ternary system. It is proposed, for the first time, that this new compound in MgO-rich layer is the real source of Mg-ion indiffusion lithium niobate.

  16. Effects of Mg and Si ions on the symmetry of δ-AlOOH

    Komatsu, K.; Sano-Furukawa, A.; Kagi, H.


    We conducted powder neutron diffraction for δ-AlOOH samples with and without Mg and Si ions under ambient conditions in order to investigate the long-standing problem of the symmetry of this phase. The observed reflection conditions clearly show that the space group of pure δ-AlOOH is P21 nm with ordered hydrogen bonds, whereas that of δ-(Al0.86Mg0.07Si0.07)OOH is Pnnm or Pnn2 with disordered hydrogen bonds. It is more likely that the space group of δ-(Al0.86Mg0.07Si0.07)OOH is Pnnm, because cation or hydrogen ordering that breaks the mirror plane perpendicular to c axis in the Pnnm structure would not occur. The previously reported inconsistency for the space group of this phase was caused by the substitution of Mg and Si ions to Al site, i.e., the disordered cations with different valences may fluctuate hydrogen positions, and the disordered hydrogen causes the symmetry change.

  17. Safety and efficacy of a fixed-dose cyclosporin microemulsion (100 mg) for the treatment of psoriasis.

    Shintani, Yoichi; Kaneko, Natumi; Furuhashi, Takuya; Saito, Chiyo; Morita, Akimichi


    Cyclosporin is a second-line modality for the treatment of psoriasis. The long-term efficacy of cyclosporin and potential adverse side-effects, however, are a concern to patients. Therefore, a cyclosporin microemulsion (Neoral), which is steadily absorbed at an ultra-low dosage (1-2 mg/kg per day) or low dosage (2-3 mg/kg per day), is currently recommended. The dose must be calculated based on patient bodyweight and the blood concentration monitored regularly, which is time-consuming. Furthermore, the concentration is related to the safety profile, but not to efficacy. We examined whether a fixed-dose cyclosporin microemulsion (100 mg/day) is effective for treating psoriasis. Enrolled patients (n = 40) were given either 100 mg cyclosporin emulsion once daily (group A) or 50 mg twice daily (group B), regardless of patient weight and condition, before meals in a randomized controlled study. Patient bodyweight ranged 50-80 kg. We assessed the serum cyclosporin concentration 1 h after administrating the medicine (C1 score), Psoriasis Area and Severity Index (PASI) score, quality of life, and the results of regular blood examinations. The improvement rate was 69.4 ± 4.8% in group A and 73.4 ± 4.3% in group B. PASI-50 was achieved by 82% in group A and 84% in group B. At 6 weeks, the number of patients with PASI-50 was significantly higher in group A than in group B. PASI-75 and -90 were also achieved in both groups with no significant difference between groups. Administration of a fixed-dose cyclosporin microemulsion (100 mg/day) is practical for second-line psoriasis treatment. © 2011 Japanese Dermatological Association.

  18. MgO nanoparticles as antibacterial agent: preparation and activity

    Zhen-Xing Tang; Bin-Feng Lv


    Bacterial pollution is a great risk for human health. Nanotechnology offers a way to develop new inorganic antibacterial agents. Nano-inorganic metal oxide has a potential to reduce bacterial contamination. MgO is an important inorganic oxide and has been widely used in many fields. Many studies have shown that MgO nanoparticles have good antibacterial activity. Therefore, in this paper, the main synthesis methods, antibacterial activity and antibacterial mechanisms of MgO nanoparticles are r...

  19. MgO nanoparticles as antibacterial agent: preparation and activity

    Zhen-Xing Tang; Bin-Feng Lv


    Bacterial pollution is a great risk for human health. Nanotechnology offers a way to develop new inorganic antibacterial agents. Nano-inorganic metal oxide has a potential to reduce bacterial contamination. MgO is an important inorganic oxide and has been widely used in many fields. Many studies have shown that MgO nanoparticles have good antibacterial activity. Therefore, in this paper, the main synthesis methods, antibacterial activity and antibacterial mechanisms of MgO nanoparticles are r...

  20. Oxidation of Mg adsorbed on Ru(001): A photoemission study

    Malik, I.J.; Hrbek, J. (Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)); Shek, M. (National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973 (United States)); Bzowski, A.; Kristof, P.; Sham, T.K. (Department of Chemistry, University of Western Ontario, London, Ontario NA6 5B7 (Canada))


    We studied the interaction of oxygen with Mg overlayers adsorbed on Ru(001). Soft x-ray synchrotron radiation was used to explore photoemission from the valence band, the O 2{ital p}, O 2{ital s}, and Mg 2{ital p} levels, as well as intra- and interatomic Auger processes. The photoemission results are complemented by thermal desorption data. The O/Mg/Ru system shows photoemission features characteristic of molecular orbitals of a dioxygen species.

  1. MgO nanoparticles as antibacterial agent: preparation and activity

    Tang, Zhen-Xing, E-mail: [Department of Food Science, Anqing, Vocational and Technical College, Anqing, Anhui (China); Lv, Bin-Feng [Date Palm Research Center, King Faisal University, (Saudi Arabia)


    Bacterial pollution is a great risk for human health. Nanotechnology offers a way to develop new inorganic antibacterial agents. Nano-inorganic metal oxide has a potential to reduce bacterial contamination. MgO is an important inorganic oxide and has been widely used in many fields. Many studies have shown that MgO nanoparticles have good antibacterial activity. Therefore, in this paper, the main synthesis methods, antibacterial activity and antibacterial mechanisms of MgO nanoparticles are reviewed. (author)

  2. Attempts at doping indium in MgB2

    Grivel, Jean-Claude


    Indium (In) doped MgB2 polycrystalline samples were prepared by solid-liquid phase reaction in Ar. After reaction at 800 °C, less than 1 at.% Mg was replaced by In in the MgB2 phase, without significant influence on its lattice parameters and only a slight decrease of its superconducting transition...... in both the doped and undoped samples....

  3. Hydrodechlorination of Tetrachloromethane over Palladium Catalysts Supported on Mixed MgF2-MgO Carriers

    Magdalena Bonarowska


    Full Text Available Pd/MgO, Pd/MgF2 and Pd/MgO-MgF2 catalysts were investigated in the reaction of CCl4 hydrodechlorination. All the catalysts deactivated in time on stream, but the degree of deactivation varied from catalyst to catalyst. The MgF2-supported palladium with relatively large metal particles appeared the best catalyst, characterized by good activity and selectivity to C2-C5 hydrocarbons. Investigation of post-reaction catalyst samples allowed to find several details associated with the working state of hydrodechlorination catalysts. The role of support acidity was quite complex. On the one hand, a definite, although not very high Lewis acidity of MgF2 is beneficial for shaping high activity of palladium catalysts. The MgO-MgF2 support characterized by stronger Lewis acidity than MgF2 contributes to very good catalytic activity for a relatively long reaction period (~5 h but subsequent neutralization of stronger acid centers (by coking eliminates them from the catalyst. On the other hand, the role of acidity evolution, which takes place when basic supports (like MgO are chlorided during HdCl reactions, is difficult to assess because different events associated with distribution of chlorided support species, leading to partial or even full blocking of the surface of palladium, which plays the role of active component in HdCl reactions.

  4. Enhanced voltage-controlled magnetic anisotropy in magnetic tunnel junctions with an MgO/PZT/MgO tunnel barrier

    Chien, Diana; Li, Xiang; Wong, Kin; Zurbuchen, Mark A.; Robbennolt, Shauna; Yu, Guoqiang; Tolbert, Sarah; Kioussis, Nicholas; Khalili Amiri, Pedram; Wang, Kang L.; Chang, Jane P.


    Compared with current-controlled magnetization switching in a perpendicular magnetic tunnel junction (MTJ), electric field- or voltage-induced magnetization switching reduces the writing energy of the memory cell, which also results in increased memory density. In this work, an ultra-thin PZT film with high dielectric constant was integrated into the tunneling oxide layer to enhance the voltage-controlled magnetic anisotropy (VCMA) effect. The growth of MTJ stacks with an MgO/PZT/MgO tunnel barrier was performed using a combination of sputtering and atomic layer deposition techniques. The fabricated MTJs with the MgO/PZT/MgO barrier demonstrate a VCMA coefficient, which is ˜40% higher (19.8 ± 1.3 fJ/V m) than the control sample MTJs with an MgO barrier (14.3 ± 2.7 fJ/V m). The MTJs with the MgO/PZT/MgO barrier also possess a sizeable tunneling magnetoresistance (TMR) of more than 50% at room temperature, comparable to the control MTJs with an MgO barrier. The TMR and enhanced VCMA effect demonstrated simultaneously in this work make the MgO/PZT/MgO barrier-based MTJs potential candidates for future voltage-controlled, ultralow-power, and high-density magnetic random access memory devices.

  5. Comparing the Electrochemical Performance of LiFePO4/C Modified by Mg Doping and MgO Coating

    Jianjun Song


    Full Text Available Supervalent cation doping and metal oxide coating are the most efficacious and popular methods to optimize the property of LiFePO4 lithium battery material. Mg-doped and MgO-coated LiFePO4/C were synthesized to analyze their individual influence on the electrochemical performance of active material. The specific capacity and rate capability of LiFePO4/C are improved by both MgO coating and Mg doping, especially the Mg-doped sample—Li0.985Mg0.015FePO4/C, whose discharge capacity is up to 163 mAh g−1, 145.5 mAh g−1, 128.3 mAh g−1, and 103.7 mAh g−1 at 1 C, 2 C, 5 C, and 10 C, respectively. The cyclic life of electrode is obviously increased by MgO surface modification, and the discharge capacity retention rate of sample LiFePO4/C-MgO2.5 is up to 104.2% after 100 cycles. Comparing samples modified by these two methods, Mg doping is more prominent on prompting the capacity and rate capability of LiFePO4, while MgO coating is superior in terms of improving cyclic performance.

  6. Hydrogen generation via hydrolysis of nanocrystalline MgH2 and MgH2-based composites

    HU Lian-xi; WANG Er-de


    Nanocrystalline MgH2 and MgH2-based composites with 25% (mass fraction) of Al, Ca, or CaH2 as an individual additive respectively were prepared by ball milling. The crystallite size and morphology of the as-milled powders were characterized and their hydrolysis behaviours were investigated in comparison with commercial polycrystalline MgH2. The results show that the crystallite size of both MgH2 and MgH2-based composites is reduced to less than 13 nm after milling for 15 h. Due to its enhanced specific surface area and unique nanocrystalline structure, the as-milled MgH2 shows much better hydrolysis kinetics than the commercial polycrystalline MgH2, with the hydrolysed fraction upon hydrolysing for 70 min enhances from 7.5% to about 25%. As compared with the as-milled MgH2, the MgH2-based composites with either CaH2 or Ca as an additive present further greatly improved hydrolysis kinetics, with the hydrolysed fraction for 80 min achieving about 76% and 62% respectively.However, the addition of Al doesn't show any positive effect on the improvement of the hydrolysis kinetics of MgH2.

  7. Effect of sterilization process on surface characteristics and biocompatibility of pure Mg and MgCa alloys

    Liu, X.L.; Zhou, W.R.; Wu, Y.H.; Cheng, Y. [Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871 (China); Zheng, Y.F., E-mail: [Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871 (China); State Key Laboratory for Turbulence and Complex System, College of Engineering, Peking University, Beijing 100871 (China); Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871 (China)


    The aim of this work was to investigate the effect of various sterilization methods on surface characteristics and biocompatibility of MgCa alloy, with pure Mg as a comparison, including steam autoclave sterilization (SA), ethylene oxide steam sterilization (EO), glutaraldehyde sterilization (GD), dry heat sterilization (DH) and Co60 γ ray radiation sterilization (R) technologies. The surface characterizations were performed by environmental scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, grazing incidence X-ray diffraction, water contact angle and surface free energy measurement, whereas the cytotoxicity and hemocompatibility were evaluated by cellular adhesive experiment, platelet adhesion and hemolysis test. The results showed that the five sterilization processes caused more changes on the surface of MgCa alloy than that on the surface of pure Mg. The GD sterilization caused the most obvious changes on the surface of the pure Mg, and the SA sterilization made the largest alteration on the MgCa alloy surface. The GD and DH sterilization processes could cause increases on surface free energy for both pure Mg and MgCa alloys, while the other three sterilization processes reduced the surface free energy. The DH and GD sterilization processes caused the least alteration on the cell adhesion on pure Mg surface, whereas the EO sterilization performed the greatest impact on the cell adhesion on the Mg–Ca alloy surface. The hemolysis percentage of pure Mg and MgCa alloys were reduced by SA sterilization, meanwhile the other four sterilization processes increased their hemolysis percentages significantly, especially for the EO sterilization. - Highlights: • The effect of sterilization on surface chemistry and biocompatibility was studied. • Sterilization caused more surface changes on MgCa alloy than pure Mg. • Co60 γ ray radiation is the most appropriate sterilization process.

  8. Mg-doped hydroxyapatite nanoplates for biomedical applications: A surfactant assisted microwave synthesis and spectroscopic investigations

    Mishra, Vijay Kumar [Department of Physics, Faculty of Science, Banaras Hindu University, Varanasi 221005 (India); Bhattacharjee, Birendra Nath; Parkash, Om [Department of Ceramic Engineering, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005 (India); Kumar, Devendra, E-mail: [Department of Ceramic Engineering, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005 (India); Rai, Shyam Bahadur, E-mail: [Department of Physics, Faculty of Science, Banaras Hindu University, Varanasi 221005 (India)


    Highlights: • Microwave irradiation technique: employed for the synthesis of Mg-HAp nanoplates. • Surfactant (EDTA) assisted synthesis of Mg-HAp. • FT-IR and Raman analysis of functional groups of Mg-HAp. - Abstract: Nanoplates of Mg doped hydroxyapatite (Mg-HAp) were derived successfully and rapidly via microwave irradiation technique. Hydroxyapatite (HAp) is the hard tissues and main inorganic component in mammals. Different nanostructures of HAp exist in different parts of human bone but nanorods are very common due to its intrinsic nature to grow in rode-like structure under physiological as well as under applied ambient conditions in laboratory. On the addition of Mg at very low level (0.06 mol%) in pure HAp results the formation of 2-D plate-like nanostructures rather than rod-like which is the matter of interest. In this attempt our efforts have been focused on the study of effect of Mg incorporation on structural and spectroscopic properties of HAp prepared via microwave irradiation technique. This technique is preferred due to several advantages viz. very fast as well as homogeneous heating, time/energy saving and eco-friendliness. The calcium nitrate tetrahydrate (Ca(NO{sub 3}){sub 2}⋅4H{sub 2}O)) as a source of calcium, magnesium nitrate hexahydrate (Mg(NO{sub 3}){sub 2}⋅6H{sub 2}O) as a source of magnesium, disodium hydrogen phosphate dihydrate (NaH{sub 2}PO{sub 4}⋅2H{sub 2}O) as a source of phosphorous and sodium ethylene diamine tetra acetate (NaEDTA) as a surfactant were used as starting reagents. Sodium hydroxide (NaOH) pellets were employed to adjust the pH value of final solution. The solution of fixed pH value was kept into the microwave oven generating waves of frequency 2.45 GHz (water absorption frequency) and power 750 W for 8 min. The precipitate thus obtained was washed, centrifuged and then dried at 100 °C for 2 h. Dried powder was then calcined at 700 °C for 2 h. The bright white powder thus obtained was characterized

  9. Boron isotope effect in superconducting MgB2.

    Bud'ko, S L; Lapertot, G; Petrovic, C; Cunningham, C E; Anderson, N; Canfield, P C


    We report the preparation method of and boron isotope effect for MgB2, a new binary intermetallic superconductor with a remarkably high superconducting transition temperature T(c)(10B) = 40.2 K. Measurements of both temperature dependent magnetization and specific heat reveal a 1.0 K shift in T(c) between Mg11B2 and Mg10B2. Whereas such a high transition temperature might imply exotic coupling mechanisms, the boron isotope effect in MgB2 is consistent with the material being a phonon-mediated BCS superconductor.

  10. Mg-Zr-Sr alloys as biodegradable implant materials.

    Li, Yuncang; Wen, Cuie; Mushahary, Dolly; Sravanthi, Ragamouni; Harishankar, Nemani; Pande, Gopal; Hodgson, Peter


    Novel Mg-Zr-Sr alloys have recently been developed for use as biodegradable implant materials. The Mg-Zr-Sr alloys were prepared by diluting Mg-Zr and Mg-Sr master alloys with pure Mg. The impact of Zr and Sr on the mechanical and biological properties has been thoroughly examined. The microstructures and mechanical properties of the alloys were characterized using optical microscopy, X-ray diffraction and compressive tests. The corrosion resistance was evaluated by electrochemical analysis and hydrogen evolution measurement. The in vitro biocompatibility was assessed using osteoblast-like SaOS2 cells and MTS and haemolysis tests. In vivo bone formation and biodegradability were studied in a rabbit model. The results indicated that both Zr and Sr are excellent candidates for Mg alloying elements in manufacturing biodegradable Mg alloy implants. Zr addition refined the grain size, improved the ductility, smoothed the grain boundaries and enhanced the corrosion resistance of Mg alloys. Sr addition led to an increase in compressive strength, better in vitro biocompatibility, and significantly higher bone formation in vivo. This study demonstrated that Mg-xZr-ySr alloys with x and y ≤5 wt.% would make excellent biodegradable implant materials for load-bearing applications. Copyright © 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

  11. Defect structure of ultrafine MgB{sub 2} nanoparticles

    Bateni, Ali; Somer, Mehmet, E-mail:, E-mail: [Department of Chemistry, Koc University, Rumelifeneri Yolu, Sariyer, Istanbul (Turkey); Repp, Sergej; Erdem, Emre, E-mail:, E-mail: [Institut für Physikalische Chemie, Universität Freiburg, Albertstr. 21 79104 Freiburg (Germany); Thomann, Ralf [Freiburger Materialforschungzentrum (FMF) für Physikalische Chemie, Universität Freiburg, Stefan-Meier Str. 21 79104 Freiburg (Germany); Acar, Selçuk [Pavezyum Chemicals, Orhanlı Mah. Ulu Sokak, No. 3, 34956 Tuzla, Istanbul (Turkey)


    Defect structure of MgB{sub 2} bulk and ultrafine particles, synthesized by solid state reaction route, have been investigated mainly by the aid of X-band electron paramagnetic resonance spectrometer. Two different amorphous Boron (B) precursors were used for the synthesis of MgB{sub 2}, namely, boron 95 (purity 95%–97%, <1.5 μm) and nanoboron (purity >98.5%, <250 nm), which revealed bulk and nanosized MgB{sub 2}, respectively. Scanning and transmission electron microscopy analysis demonstrate uniform and ultrafine morphology for nanosized MgB{sub 2} in comparison with bulk MgB{sub 2}. Powder X-ray diffraction data show that the concentration of the by-product MgO is significantly reduced when nanoboron is employed as precursor. It is observed that a significant average particle size reduction for MgB{sub 2} can be achieved only by using B particles of micron or nano size. The origin and the role of defect centers were also investigated and the results proved that at nanoscale MgB{sub 2} material contains Mg vacancies. Such vacancies influence the connectivity and the conductivity properties which are crucial for the superconductivity applications.

  12. Mg(BH4)2和MgH2对RDX热分解特性的影响%Effect of Mg(BH4) 2 and MgH2 on Thermal Decomposition Performance of RDX

    姚淼; 陈利平; 堵平; 彭金华


    在黑索今(RDX)中加入具有高热值的金属氢化物(Mg(BH4)2和MgH2)有望提高RDX的爆炸性能,但同时给RDX的安全使用带来挑战.为了探索RDX与这2种金属氢化物的相容性与安定性,采用差示扫描量热法(DSC)研究Mg(BH4)2和MgH2对RDX热分解性能的影响,并由DSC得到的数据计算动力学参数,参照GJB770B——2005的方法分析这2种金属氢化物与RDX的相容性和安定性.结果表明,加入Mg(BH4)2使RDX的表观活化能从159.22 kJ/mol增加至180.27 kJ/mol,加入MgH2使RDX的表观活化能降低至133.69 kJ/mol; Mg(BH4)2与RDX的相容性为1级,MgH2与RDX的相容性为3级,加入Mg(BH4)2使RDX的安定性有所提高,加入MgH2降低了RDX的安定性.因此,在将MgH2作为RDX的高能添加剂以前,必须首先提高其与RDX的相容性以保证试验和存储过程的安全.%Metal hydrides ( Mg ( BH4) 2 and MgH2 ) with high heat values are expected to improve the explosion properties of RDX. However, they bring safety problems at the same time. In order to explore the consistencies between RDX and these two kinds of metal hydrides, the DSC was used to study the thermal decomposition characteristics of RDX influenced by the addition of Mg( BH4) 2 and MgH2. The consistencies between RDX and two kinds of metal hydrides were calculated and compared though the standard GJB770B - 2005 respectively. In addition, the stabilities of the mixtures were obtained, too. The results show that the addition of Mg(BH4)2 increases the apparent activation energy from 159. 22 kj/mol to 182.27 kj/mol and the addition of MgH2 decreases the apparent activation energy of RDX to 133. 69 kj/mol. The consistency grade of Mg( BH4 )2/RDX is 1 and the consistency grade of MgH2/RDX is 3 besides, the addition of Mg(BH4)2 is benefit to the stability of RDX and the addition of MgH2 lower the stability of RDX. So, how to enhance the consistency between RDX and MgH2 is the principal problem when adding MgH2 to RDX.

  13. Randomized clinical trial of dexketoprofen/tramadol 25 mg/75 mg in moderate-to-severe pain after total hip arthroplasty

    McQuay, H. J.; Moore, R. A.; Berta, A.; Gainutdinovs, O.; Fülesdi, B.; Porvaneckas, N.; Petronis, S.; Mitkovic, M.; Bucsi, L.; Samson, L.; Zegunis, V.; Ankin, M. L.; Bertolotti, M.; Pizà-Vallespir, B.; Cuadripani, S.; Contini, M. P.; Nizzardo, A.


    Background. The aim was to evaluate the analgesic efficacy and safety of the dexketoprofen/tramadol 25 mg/75 mg fixed-dose combination vs dexketoprofen (25 mg) and tramadol (100 mg) in moderate-to-severe acute pain after total hip arthroplasty. Methods. This was a randomized, double-blind, parallel-group study in patients experiencing pain of at least moderate intensity on the day after surgery, compared with placebo at first administration to validate the pain model. The study drug was administered orally every 8 h throughout a 5 day period. Rescue medication, metamizole 500 mg, was available during the treatment period. The evaluation of efficacy was based on patient assessments of pain intensity and pain relief. The primary end point was the mean sum of the pain intensity difference values throughout the first 8 h (SPID8). Results. Overall, 641 patients, mean age 62 (range 29–80) yr, were analysed; mean (sd) values of SPID8 were 247 (157) for dexketoprofen/tramadol, 209 (155) for dexketoprofen, 205 (146) for tramadol, and 151 (159) for placebo. The primary analysis confirmed the superiority of the combination over dexketoprofen 25 mg (P=0.019; 95% confidence interval 6.4–73) and tramadol 100 mg (P=0.012; 95% confidence interval 9.5–76). The single components were superior to placebo (P<0.05), confirming model sensitivity. Most secondary analyses supported the superiority of the combination. The incidence of adverse drug reactions was low and similar among active treatment groups. Conclusion. The efficacy results confirmed the superiority of dexketoprofen/tramadol over its single components, even at higher doses (tramadol), with a safety profile fully in line with that previously known for these agents in monotherapy. Clinical trial registration. EudraCT 2012-004548-31 (; NCT01902134 (

  14. Spectroscopic properties of MgH2, MgD2, and MgHD calculated from a new ab initio potential energy surface.

    Li, Hui; Le Roy, Robert J


    A three-dimensional potential energy surface for the ground electronic state of MgH2 has been constructed from 9030 symmetry-unique ab initio points calculated using the icMRCI+Q method with aug-cc-pVnZ basis sets for n=3, 4, and 5, with core-electron correlation calculated at the MR-ACPF level of theory using cc-pCVnZ basis sets, with both calculations being extrapolated to the complete basis set limit. Calculated spectroscopic constants of MgH2 and MgD2 are in excellent agreement with recent experimental results: for four bands of MgH2 and one band of MgD2 the root-mean-square (rms) band origin discrepancies were only 0.44 and 0.06 cm(-1), respectively, and the rms relative discrepancies in the inertial rotational constants (B[v]) were only 0.0196% and 0.0058%, respectively. Spectroscopic constants for MgHD were predicted using the same potential surface.

  15. Group Work: How to Use Groups Effectively

    Burke, Alison


    Many students cringe and groan when told that they will need to work in a group. However, group work has been found to be good for students and good for teachers. Employers want college graduates to have developed teamwork skills. Additionally, students who participate in collaborative learning get better grades, are more satisfied with their…

  16. A multicentric, open label, randomised, postmarketing efficacy study comparing multidose of lincomycin hydrochloride capsule 500 mg with multidose cefpodoxime proxetil tablet 200 mg in patients with tonsillitis, sinusitis.

    Kothadiya, Ajay


    Tonsillitis causes considerable short and medium term morbidity, and can be recurrent. Sinusitis can be acute (less than 4 weeks), subacute (4-8 weeks) or chronic (8 weeks or more). To study the comparative efficacy and safety of multidose treatments of lincomycin hydrochloride 500 mg capsules against cefpodoxime proxetil 200 mg tablets on its outcome in the Indian scenario are the aims and objective of the study. A total of 41 tonsillitis, sinusitis cases of either gender aged above 18 years were enrolled in the study. The diagnosis of sonsillitis, sinusitis was made based on examination of symptoms and throat swab. A randomised treatment of either lincomycin hydrochloride 500 mg capsules or cefpodoxime proxetil 200 mg tablets twice daily for five days alongwith other concomitant medications depending on related symptoms was given to 40 patients. At the end of study, all patients were re-evaluated and the response rate was assessed. The most common clinical symptoms were body temperature, headache, throat pain, postnasal discharge, mucopus, odynophagia, sinus tenderness, nasal congestion, pharyngeal congestion and tonsillar congestion. The overall response rate of lincomycin hydrochloride in all the symptoms except headache was more effective than cefpodoxime proxetil. Out of 100% (n = 20) patients in each group, 67.89% in lincomycin and 52.27% in cefpodoxime patients achieved complete relief, in all the clinical symptoms. The study suggests that lincomycin hydrochloride capsules, a conventional antibiotic indicates effective treatment for relief from tonsillitis and sinusitis, as compared to new third generation antibiotic.

  17. Small Group Research

    McGrath, Joseph E.


    Summarizes research on small group processes by giving a comprehensive account of the types of variables primarily studied in the laboratory. These include group structure, group composition, group size, and group relations. Considers effects of power, leadership, conformity to social norms, and role relationships. (Author/AV)

  18. Free Boolean Topological Groups

    Ol’ga Sipacheva


    Full Text Available Known and new results on free Boolean topological groups are collected. An account of the properties that these groups share with free or free Abelian topological groups and properties specific to free Boolean groups is given. Special emphasis is placed on the application of set-theoretic methods to the study of Boolean topological groups.

  19. The effects of Ni and Mg{sub 2}Ni interlayer on hydrogenation properties of Pd sandwiched Mg films

    Jain, Pragya, E-mail: [Centre for Non-Conventional Energy Resources, University of Rajasthan, Jaipur 302055 (India); Jain, Ankur; Vyas, Devendra; Verma, Reena [Centre for Non-Conventional Energy Resources, University of Rajasthan, Jaipur 302055 (India); Khan, S.A. [Inter University Accelerator Centre, New Delhi 110 067 (India); Jain, I.P., E-mail: [Centre for Non-Conventional Energy Resources, University of Rajasthan, Jaipur 302055 (India)


    Research highlights: > Hydrogen storage in solid state media has been centre of attraction due to several merits over other methods i.e. liquid and gaseous storage of hydrogen. > Particular attention has been focused on Mg based materials because high capacity storage can be achieved in these materials. However, problems regarding high thermodynamic stability and slow kinetics must be addressed before these hydrides can be used for transportation applications. > Thin films are a good approach to understand the mechanism of hydrogen sorption processes in Mg based materials, but on the other hand it is very difficult to measure hydrogen content in thin films using conventional Sievert type method due to low amount of available hydrogen in thin films. > ERDA technique has been proven as a useful tool for depth profiling and content measurement of hydrogen in thin films. > The present research is an attempt to measure hydrogen content in Pd sandwiched Mg thin films using ERDA. Additionally the effect of Ni and Mg2Ni layer on these systems has also been observed and discussed. - Abstract: The scope of present study is to investigate and compare the areal hydrogen concentration of Pd/Mg/Ni/Pd and Pd/Mg/Mg{sub 2}Ni/Pd films with the Pd/Mg/Pd base system using Elastic Recoil Detection Analysis (ERDA) technique. Metals were deposited on Si substrate by thermal evaporation and electron gun evaporation technique followed by hydrogenation for 2 h at 150 deg. C and 2 bar hydrogen pressure. ERDA study reveals that Pd/Mg/Ni/Pd and Pd/Mg/Mg{sub 2}Ni/Pd films absorb 7.08 x 10{sup 17} and 1.68 x 10{sup 18} hydrogen atoms/cm{sup 2}, respectively, in comparison to 4 x 10{sup 17} atoms/cm{sup 2} absorbed by base system. The influence of Ni and Mg{sub 2}Ni interlayer on the hydrogen storage properties of base system were investigated by changes in structural and surface topographical properties using XRD and AFM techniques, respectively. These results strongly supports the ERDA findings

  20. Effect of strontium on crystallization of Mg2Si phase in Al-Si-Mg casting alloys

    廖恒成; 丁毅; 孙国雄


    Optical microscope and SEM were used to observe the changes of the microstructure of Al-11.6%Si-0.4%Mg alloys with varying strontium additions and the effect of strontium on the crystallization of Mg2Si phase was discussed. It is found that Mg2Si phase nucleates on the surfaces of the eutectic silicon flakes in the unfully modified alloys, growing as meshwork or bamboo-shoot shape, however, very few and fine Mg2Si particles phase are isolated at the boundaries of the eutectic cells in the fully modified alloys. Strontium has an important influence on the crystallization of Mg2Si phase in Al-Si-Mg casting alloys and it is thought to be related to the increase of the amount of dendritic α phase and the modifying degree of eutectic silicon phase.

  1. Scleractinian Fossil Corals as Archives of Seawater δ26Mg

    Gothmann, A. O.; Higgins, J. A.; Adkins, J. F.; Stolarski, J.; Bender, M. L.


    The recovery of environmental signatures from coral skeletons is often made difficult by 'vital effects', which cause skeletal chemistry to deviate from the expected composition of aragonite in equilibrium with seawater. Recent studies show that Mg isotopes in scleractinian corals are subject to vital effects, which appear as a departure of the δ26Mg coral temperature dependence from that of inorganic aragonite [1]. However, different from the case for Mg/Ca or δ44Ca in coral, the magnitude of the observed Mg-isotope vital effect is small (on the order of 0.1 ‰ or less). In addition, measurements of different species of modern coral show similar fractionations, suggesting that coral δ26Mg is not species dependent [2]. Together, these observations indicate that corals should faithfully record the seawater Mg-isotope composition, and that vital effects will not bias reconstructions. We measured Mg isotopes in a set of extremely well-preserved fossil scleractinian corals, ranging in age from Jurassic through Recent, to reconstruct past seawater δ26Mg. Well-preserved fossil corals of similar age show a range in δ26Mg of ~0.2 ‰, pointing to the presence of vital effects. However, our results show little variability in the δ26Mg of fossil corals across different geologic ages, suggesting that seawater δ26Mg has remained relatively constant throughout the Cenozoic and Mesozoic. This pattern has implications for our understanding of the mechanisms driving secular variations in seawater Mg/Ca. In particular, our data imply that dolomitization rates have not changed enough during the Mesozoic and Cenozoic to account for secular variations in seawater Mg/Ca. Our coral δ26Mg record agrees with a Cenozoic record from bulk foraminifera, further supporting the faithfulness of the coral archive. However, both of these records disagree with a third Cenozoic Mg-isotope record, derived from species-specific planktic forams [3]. [1] Saenger, C. et al. (2014) Chem. Geol

  2. Growth of high Mg content wurtzite MgZnO epitaxial films via pulsed metal organic chemical vapor deposition

    Alema, Fikadu; Ledyaev, Oleg; Miller, Ross; Beletsky, Valeria; Osinsky, Andrei; Schoenfeld, Winston V.


    We report on the growth of high Mg content, high quality, wurtzite MgxZn1-xO (MgZnO) epitaxial films using a pulsed metal organic chemical vapor deposition (PMOCVD) method. Series of MgZnO films with variable Mg concentration were deposited on bare and AlN coated sapphire substrates. The band gap of the films estimated using UV-visible transmission spectra ranges from 3.24 eV to 4.49 eV, corresponding to fraction of Mg between x=0.0 and x=0.51, as determined by Rutherford backscattering spectroscopy. The cathodoluminescence (CL) measurement has shown a blue-shift in the peak position of MgZnO with an increasing Mg content. No multi-absorption edges and CL band splitting were observed, suggesting the absence of phase segregation in the as grown films. The crystal structure and phase purity of the films were also confirmed by XRD analysis. Hall effect measurement in van der Pauw configuration was employed to evaluate the electrical properties of the films. With a rise in Mg incorporation into the ZnO lattice, the films became very resistive, consistent with the widening of the band gap. The AFM measurement on the films has shown a decreasing surface roughness with an Mg content. To the best of our knowledge, the current result shows the highest Mg content (x=0.51), high quality, wurtzite MgZnO epitaxial film ever grown by MOCVD. The high Mg incorporation without phase separation is believed to be due to the non-equilibrium behavior of the PMOCVD in which the kinetic processes dominate the thermodynamic one.

  3. Microstructure, In Vitro Corrosion Behavior and Cytotoxicity of Biodegradable Mg-Ca-Zn and Mg-Ca-Zn-Bi Alloys

    Bakhsheshi-Rad, H. R.; Hamzah, E.; Tok, H. Y.; Kasiri-Asgarani, M.; Jabbarzare, S.; Medraj, M.


    The effects of bismuth (Bi) addition on the microstructure and corrosion behavior of the Mg-Ca-Zn-Bi alloys were evaluated using electron microscopy, electrochemical test and electrochemical impedance spectroscopy. Microstructural observations showed that Mg-1.2Ca-1Zn- xBi ( x = 0.5, 1.5, 3 wt.%) are composed of Mg2Ca, Ca2Mg6Zn3 and Mg3Bi2 phases while a new phase Mg2Bi2Ca appeared after the addition of 5 and 12 wt.% Bi to the Mg-1.2Ca-1Zn alloy. Furthermore, the additions of 0.5 wt.% Bi to the Mg-1.2Ca-1Zn alloy slightly improved the corrosion behavior of the alloy, while further increase in Bi amount from 1.5 to 12 wt.% has a deleterious effect on the corrosion behavior of the ternary Mg-1.2Ca-1Zn alloy which is driven by galvanic coupling effect. Cytotoxicity tests indicate that the Mg-1.2Ca-1Zn presents higher cell viability compared to Mg-1.2Ca-1Zn-0.5Bi alloy. In addition, the cell viability of both alloys increased with increasing incubation time while diluting the extracts to 50% and 10% improved the cell viabilities. The present results suggest that the Mg-1.2Ca-1Zn-0.5Bi can be interesting candidate for the development of degradable biomaterials and it is worthwhile for further investigation in an in vivo environment.

  4. Synthesis and crystal structure of NaMgFe(MoO43

    Manel Mhiri


    Full Text Available The iron molybdate NaMgFe(MoO43 {sodium magnesium iron(III tris[molybdate(VI]} has been synthesized by the flux method. This compound is isostructural with α-NaFe2(MoO43 and crystallizes in the triclinic space group P-1. Its structure is built up from [Mg,Fe]2O10 units of edge-sharing [Mg,Fe]O6 octahedra which are linked to each other through the common corners of [MoO4] tetrahedra. The resulting anionic three-dimensional framework leads to the formation of channels along the [101] direction in which the Na+ cations are located.

  5. Preparation of hydrogen by methanol decomposition over Fe/MgO, Co/MgO and Ni/MgO catalysts%甲醇在Fe/MgO、Co/MgO和Ni/MgO催化剂上裂解制备氢气

    朱刚; 焦宝娟


    The catalysts of Fe, Co and Ni supported on MgO were prepared by the means of impregnation. Methanol decomposition over Fe/MgO, Co/MgO and Ni/MgO catalysts were systematically investigated at 600℃. The results indicated that the production of H2 by methanol decomposition could be realized over these catalysts and carbon nano-tubes were produced at the same time. Ni/MgO was the best one among the three catalysts.%采用浸渍法制备出3种MgO负载型过渡金属催化剂Fe/MgO、Co/MgO和Ni/MgO,系统研究了甲醇在3种催化剂上于600℃下的裂解产物.结果表明,3种催化剂均能催化甲醇裂解产生富氢气体,同时产生碳纳米管.其中,Ni/MgO具有最佳的催化效果.

  6. MSUD Family Support Group

    ... Group The MSUD Family Support Group is a non-profit 501 (c)(3) organization for those with MSUD ... Family Support Group is a 501(c)(3) non-profit organization with no paid staff. Funds are needed ...

  7. Profinite graphs and groups

    Ribes, Luis


    This book offers a detailed introduction to graph theoretic methods in profinite groups and applications to abstract groups. It is the first to provide a comprehensive treatment of the subject. The author begins by carefully developing relevant notions in topology, profinite groups and homology, including free products of profinite groups, cohomological methods in profinite groups, and fixed points of automorphisms of free pro-p groups. The final part of the book is dedicated to applications of the profinite theory to abstract groups, with sections on finitely generated subgroups of free groups, separability conditions in free and amalgamated products, and algorithms in free groups and finite monoids. Profinite Graphs and Groups will appeal to students and researchers interested in profinite groups, geometric group theory, graphs and connections with the theory of formal languages. A complete reference on the subject, the book includes historical and bibliographical notes as well as a discussion of open quest...

  8. Homomorphisms of quantum groups

    Meyer, Ralf; Woronowicz, Stanisław Lech


    We introduce some equivalent notions of homomorphisms between quantum groups that behave well with respect to duality of quantum groups. Our equivalent definitions are based on bicharacters, coactions, and universal quantum groups, respectively.

  9. Ototoxicity of 12 mg/kg cisplatin in the Fischer 344/NHsd rat using multiple dosing strategies.

    Harrison, Ryan T; Seiler, Brittany M; Bielefeld, Eric C


    Ototoxicity continues to be a major dose-limiting side effect of cis-diamminedichloroplatinum(II) (cisplatin). With an ongoing need to develop pharmaceutical protection strategies for cisplatin's ototoxicity, there is also a need to develop stable in-vivo mammalian models of cisplatin ototoxicity. The current study examined the difference in ototoxicity of a cumulative 12 mg/kg dose of cisplatin in the Fischer 344/NHsd rat when administered over four different dosing protocols. Hearing sensitivity was measured using free-field auditory brainstem response thresholds under anesthesia. Rats were divided into four groups. The first group was administered 12 mg/kg of cisplatin in a single bolus infusion. The second group was administered two 6 mg/kg infusions separated by 7 days. The third group was administered 3 mg/kg injections once per day for 4 consecutive days. The fourth group was administered 3 mg/kg injections in four injections separated by 3 days each. Hearing thresholds and body weights were measured at 3 and 7 days after the final cisplatin exposure. Postmortem sensory cell counts were used to confirm injury to the auditory system. The 4 consecutive days of 3 mg/kg induced a greater mortality rate and greater hearing loss at day 3 than the other experimental protocols. The 3 mg/kg administered every 3 days induced less sensory cell loss than the other conditions. The findings indicate that 4 consecutive days of 3 mg/kg cisplatin is not a viable ototoxicity model in the Fischer 344/NHsd rat, but that the other models are all effective in inducing comparable cochlear injuries.

  10. High-precision Mg isotopic systematics of bulk chondrites

    Schiller, Martin; Handler, Monica R.; Baker, Joel A.


    Variations of the mass-independent abundance of 26Mg ( δ26Mg*) and stable Mg ( δ25Mg) isotope composition of chondrites are important because they constrain the homogeneity of 26Al and Mg isotopes in the proto-planetary disc and the validity of the short-lived 26Al-to- 26Mg chronometer applied to meteorites. We present high-precision Mg isotope data and Al/Mg ratios of chondrites representing nearly all major chondrite classes, including a step-leaching experiment on the CM2 chondrite Murchison. δ26Mg* variations in leachates of Murchison representing acid soluble material are ≤ 30 times smaller than reported for neutron-rich isotopes of Ti and Cr and do not reveal resolvable deficits in δ26Mg* (-0.002 to + 0.118‰). Very small variations in δ26Mg* anomalies in bulk chondrites (-0.006 to + 0.019‰) correlate with increasing 27Al/ 24Mg ratios and δ50Ti, reflecting the variable presence of calcium-aluminium-rich inclusions (CAIs) in some types of carbonaceous chondrites. Similarly, release of radiogenic 26Mg produced by 26Al decay from CAI material in the step-leaching of Murchison best explains the high δ26Mg* observed in the last, aggressive, leaching steps of this experiment. Overall, the observed variations in δ26Mg* are small and potential differences beyond that which result from the presence of CAI-like material cannot be detected within the analytical uncertainties of this study (± 0.004‰). The results do not allow radical heterogeneity of 26Al (≥±30%) or measurable Mg nucleosynthetic heterogeneity (≥±0.005‰) to have existed on a planetesimal scale in the proto-planetary disc. Combined with published δ26Mg* data for CAIs, the bulk chondrite data yield a precise initial ( 26Al/ 27Al) 0 = (5.21 ± 0.06) × 10 -5 and δ26Mg* = -0.0340 ± 0.0016‰ for the Solar System. However, it is not possible with the currently available data to determine with certainty whether CAIs and the material from which planetesimals accreted including

  11. Comparison of 1 mg and 2 mg overnight dexamethasone suppression tests for the screening of Cushing's syndrome in obese patients.

    Sahin, Mustafa; Kebapcilar, Levent; Taslipinar, Abdullah; Azal, Omer; Ozgurtas, Taner; Corakci, Ahmet; Akgul, Emin Ozgur; Taslipinar, Mine Yavuz; Yazici, Mahmut; Kutlu, Mustafa


    Obesity is currently a major public health problem and one of the potential underlying causes of obesity in a minority of patients is Cushing's syndrome (CS). Traditionally, the gold standard screening test for CS is 1 mg dexamethasone overnight suppression test. However, it is known that obese subjects have high false positive results with this test. We have therefore compared the 1 mg and 2 mg overnight dexamethasone suppression tests in obese subjects. Patients whose serum cortisol after ODST was >50 nM underwent and a low-dose dexamethasone suppression test (LDDST); 24-hour urine cortisol was collected for basal urinary free cortisol (UFC). For positive results after overnight 1-mg dexamethasone suppression test we also performed the overnight 2-mg dexamethasone suppression test. We prospectively evaluated 100 patients (22 men and 78 women, ranging in age from 17 to 73 years with a body mass index (BMI) >30 kg/m2 who had been referred to our hospital-affiliated endocrine clinic because of simple obesity. Suppression of serum cortisol to rate in 1 mg overnight test and 2% in 2 mg overnight test (p=0.001). There was no correlation between the cortisol levels after ODST and other parameters. Our results indicate that the 2 mg overnight dexamethasone suppression test (ODST) is more convenient and accurate than 1-mg ODST as a screening test for excluding CS in subjects with simple obesity.

  12. Food Groups Recipes


    15 pages In 2011, My Plate replaced the Food Pyramid as a visual representation for the USDA Dietary Guidelines. This publication, a group of recipes based on this new division of food groups, reflects the effort of the USDA and other groups to translate science-based research into everyday practice for Americans. Fifteen recipes (3 from each food group) show ways to use foods from each food group. They are complete with basic nutritional analyses and food group amounts.

  13. Locally minimal topological groups

    Außenhofer, Lydia; Chasco, María Jesús; Dikranjan, Dikran; Domínguez, Xabier


    A Hausdorff topological group $(G,\\tau)$ is called locally minimal if there exists a neighborhood $U$ of 0 in $\\tau$ such that $U$ fails to be a neighborhood of zero in any Hausdorff group topology on $G$ which is strictly coarser than $\\tau.$ Examples of locally minimal groups are all subgroups of Banach-Lie groups, all locally compact groups and all minimal groups. Motivated by the fact that locally compact NSS groups are Lie groups, we study the connection between local minimality and the ...

  14. GROUP PROFILE Computer Technique

    Andrey V. Sidorenkov


    Full Text Available This article contains a description of the structure, the software and functional capabilities, and the scope and purposes of application of the Group Profile (GP computer technique. This technique rests on a conceptual basis (the microgroup theory, includes 16 new and modified questionnaires, and a unique algorithm, tied to the questionnaires, for identification of informal groups. The GP yields a wide range of data about the group as a whole (47 indices, each informal group (43 indices, and each group member (16 indices. The GP technique can be used to study different types of groups: production (work groups, design teams, military units, etc., academic (school classes, student groups, and sports.

  15. Separation of reaction mechanisms at low energy. Study of the reactions: {sup 27}Al(d,p) {sup 28}Al, {sup 24}Mg(d,p) {sup 25}Mg, and {sup 24}Mg(d, {alpha}) {sup 22}Na; Sur la separation des mecanismes de reaction a basse energie. Etude des reactions: {sup 27}Al(d,p) {sup 28}Al, {sup 24}Mg(d,p) {sup 25}Mg, et {sup 24}Mg(d, {alpha}) {sup 22}Na

    Mermaz, M. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires


    The two sets of angular distributions of (d,p) reactions on Al and Mg, measured between 2 and 6 MeV, have given the possibility to test, in analysing the statistical fluctuations of cross-section, the validity of the separation of their mean values in two parts, one 'direct', another given by the statistical mechanism. With the same method of analysis we have studied excitation functions for several alpha groups of the reaction {sup 24}Mg(d, {alpha}) {sup 22}Na and given an evidence for an intermediate structure for the alpha channel leading to the 3. excited state of {sup 22}Na. The angular distribution of the wide resonance at 15.9 MeV in {sup 26}Al has been obtained. (author) [French] Les deux ensembles de distributions angulaires des reactions (d,p) sur Al et Mg, mesures entre 2 et 6 MeV, nous ont permis, en analysant les fluctuations statistiques de sections efficaces, de verifier la possibilite de la separation de leurs valeurs moyennes en deux composantes: l'une 'directe', l'autre due au mecanisme statistique. Avec la meme methode d'analyse nous avons etudie les fonctions d'excitation des premiers groupes alpha de la reaction {sup 24}Mg(d,{alpha}) {sup 22}Na et mis en evidence une structure intermediaire pour la voie de reaction aboutissant au 3eme niveau de {sup 22}Na. Nous avons obtenu la distribution angulaire de la resonance large situee a une energie d'excitation de 15,9 MeV dans {sup 26}Al. (auteur)

  16. Melt Protection of Mg-Al Based Alloys

    María J. Balart


    Full Text Available This paper reports the current status of Mg melt protection in view to identify near-future challenges, but also opportunities, for Mg melt protection of Mg-Al based alloys. The goal is to design and manufacture sustainable Mg alloys for resource efficiency, recycling and minimising waste. Among alternative cover gas technologies for Mg melt protection other than SF6: commercially available technologies containing―HFC-134a, fluorinated ketone and dilute SO2―and developed technologies containing solid CO2, BF3 and SO2F2, can potentially produce toxic and/or corrosive by-products. On the other hand, additions of alkaline earth metal oxides to Mg and its alloys have developed a strong comparative advantage in the field of Mg melt protection. The near-future challenges and opportunities for Mg-Al based alloys include optimising and using CO2 gas as feedstock for both melt protection and grain refinement and TiO2 additions for melt protection.

  17. Multiband model for tunneling in MgB2 junctions

    Brinkman, A.; Golubov, A.A.; Rogalla, H.; Dolgov, O.V.; Kortus, J.; Kong, Y.; Jepsen, O.; Andersen, O.K.


    A theoretical model for quasiparticle and Josephson tunneling in multiband superconductors is developed and applied to MgB2-based junctions. The gap functions in different bands in MgB2 are obtained from an extended Eliashberg formalism, using the results of band structure calculations. The temperat

  18. Size effects in MgO cube dissolution.

    Baumann, Stefan O; Schneider, Johannes; Sternig, Andreas; Thomele, Daniel; Stankic, Slavica; Berger, Thomas; Grönbeck, Henrik; Diwald, Oliver


    Stability parameters and dissolution behavior of engineered nanomaterials in aqueous systems are critical to assess their functionality and fate under environmental conditions. Using scanning electron microscopy, transmission electron microscopy, and X-ray diffraction, we investigated the stability of cubic MgO particles in water. MgO dissolution proceeding via water dissociation at the oxide surface, disintegration of Mg(2+)-O(2-) surface elements, and their subsequent solvation ultimately leads to precipitation of Mg(OH)2 nanosheets. At a pH ≥ 10, MgO nanocubes with a size distribution below 10 nm quantitatively dissolve within few minutes and convert into Mg(OH)2 nanosheets. This effect is different from MgO cubes originating from magnesium combustion in air. With a size distribution in the range 10 nm ≤ d ≤ 1000 nm they dissolve with a significantly smaller dissolution rate in water. On these particles water induced etching generates (110) faces which, above a certain face area, dissolve at a rate equal to that of (100) planes.1 The delayed solubility of microcrystalline MgO is attributed to surface hydroxide induced self-inhibition effects occurring at the (100) and (110) microplanes. The present work underlines the importance of morphology evolution and surface faceting of engineered nanomaterials particles during their dissolution.

  19. Antioxidant status in MgO nanoparticle-exposed rats.

    Kiranmai, G; Reddy, A Rama Narsimha


    In this present study, antioxidant status was evaluated in rat serum following exposure to magnesium oxide (MgO) nanoparticles. The lungs of rats were intratracheally instilled with (single dose) phosphate-buffered saline (PBS) + 1% of Tween 80 (solvent control) or MgO or carbonyl iron (negative control) or quartz particles (positive control) at a dose of 1 and 5 mg/kg of body weight. The blood samples were collected at 1, 7, and 30 days of postinstillation of nanoparticles after their exposure, and different parameters were estimated to assess the oxidative stress induced by the instillation of MgO. Exposure of rats to MgO produced a significant (p MgO nanoparticle-exposed rats indicates the reduction in antioxidant defense mechanisms due to the instillation of MgO. These results indicate that exposure to MgO nanoparticles induces oxidative stress by reducing the total antioxidant capacity in rats. The findings suggest possible occupational health hazard in chronic exposures.

  20. Multiwavelength observations of the Type IIb supernova 2009mg

    Oates, S. R.; Bayless, A. J.; Stritzinger, M. D.


    We present Swift Ultra-Violet Optical Telescope and X-Ray Telescope (XRT) observations, and visual wavelength spectroscopy of the Type IIb supernova (SN) 2009mg, discovered in the Sb galaxy ESO 121-G26. The observational properties of SN 2009mg are compared to the prototype Type IIb SNe 1993J...

  1. The luminescence properties of MgUO4

    Jong, K.P. de; Krol, D.M.; Blasse, G.


    The luminescence of MgUO4 has been investigated. Emission and excitation spectra as well as the decay time and the quantum efficiency of the emission were measured at 4.2 K. The temperature dependence of the emission spectrum and the emission intensity was studied. The results show that in MgUO4 the

  2. Mg2+ homeostasis: the balancing act of TRPM6.

    Wijst, J.A.J. van der; Bindels, R.J.; Hoenderop, J.G.J.


    PURPOSE OF REVIEW: The tight control of blood magnesium (Mg) levels is of central importance for numerous physiological processes. A persistent low Mg status (hypomagnesemia) is associated with severe health risks and is involved in the pathogenesis of type 2 diabetes mellitus, osteoporosis, asthma,

  3. Selective antibacterial effects of mixed ZnMgO nanoparticles

    Vidic, Jasmina, E-mail: [VIM, Institut de la Recherche Agronomique (France); Stankic, Slavica, E-mail:; Haque, Francia [CNRS, Institut des Nanosciences de Paris, UMR 7588 (France); Ciric, Danica; Le Goffic, Ronan; Vidy, Aurore [VIM, Institut de la Recherche Agronomique (France); Jupille, Jacques [CNRS, Institut des Nanosciences de Paris, UMR 7588 (France); Delmas, Bernard [VIM, Institut de la Recherche Agronomique (France)


    Antibiotic resistance has impelled the research for new agents that can inhibit bacterial growth without showing cytotoxic effects on humans and other species. We describe the synthesis and physicochemical characterization of nanostructured ZnMgO whose antibacterial activity was compared to its pure nano-ZnO and nano-MgO counterparts. Among the three oxides, ZnO nanocrystals-with the length of tetrapod legs about 100 nm and the diameter about 10 nm-were found to be the most effective antibacterial agents since both Gram-positive (B. subtilis) and Gram-negative (E. coli) bacteria were completely eradicated at concentration of 1 mg/mL. MgO nanocubes (the mean cube size {approx}50 nm) only partially inhibited bacterial growth, whereas ZnMgO nanoparticles (sizes corresponding to pure particles) revealed high specific antibacterial activity to Gram-positive bacteria at this concentration. Transmission electron microscopy analysis showed that B. subtilis cells were damaged after contact with nano-ZnMgO, causing cell contents to leak out. Our preliminary toxicological study pointed out that nano-ZnO is toxic when applied to human HeLa cells, while nano-MgO and the mixed oxide did not induce any cell damage. Overall, our results suggested that nanostructured ZnMgO, may reconcile efficient antibacterial efficiency while being a safe new therapeutic for bacterial infections.

  4. Electron beam induced oxidation of Al–Mg alloy surfaces

    Palasantzas, G.; Agterveld, D.T.L. van; Hosson, J.Th.M. De


    Electron beam currents of a few nanoamperes, currently used in nanometer scale scanning Auger/electron microscopy, induces severe oxidation of Al–Mg alloy surfaces at room temperature. Auger peak-to-peak oxygen curves for Al–Mg surfaces support the hypothesis that the electron beam creates

  5. Electron beam induced oxidation of Al–Mg alloy surfaces

    Palasantzas, G.; Agterveld, D.T.L. van; Hosson, J.Th.M. De


    Electron beam currents of a few nanoamperes, currently used in nanometer scale scanning Auger/electron microscopy, induces severe oxidation of Al–Mg alloy surfaces at room temperature. Auger peak-to-peak oxygen curves for Al–Mg surfaces support the hypothesis that the electron beam creates additiona

  6. Superconductivity in noncentrosymmetric Mg10Ir19B16

    Klimczuk, T.; Xu, Q.; Morosan, E.; Thompson, J.D.; Zandbergen, H.W.; Cava, R.J.


    Mg10Ir19B16, a previously unreported compound in the Mg-Ir-B chemical system, is found to be superconducting at temperatures near 5 K. The fact that the compound exhibits a range of superconducting temperatures between 4 and 5 K suggests that a range of stoichiometries is allowed, though no structur

  7. Multiwavelength observations of the Type IIb supernova 2009mg

    Oates, S. R.; Bayless, A. J.; Stritzinger, M. D.


    We present Swift Ultra-Violet Optical Telescope and X-Ray Telescope (XRT) observations, and visual wavelength spectroscopy of the Type IIb supernova (SN) 2009mg, discovered in the Sb galaxy ESO 121-G26. The observational properties of SN 2009mg are compared to the prototype Type IIb SNe 1993J...

  8. Effect of Platinum Group Metal Doping in Magnesium Diboride Wires

    Grivel, Jean-Claude; Alexiou, Aikaterini; Namazkar, Shahla


    The effect of some platinum group metals(PGM = Rh, Pd, and Pt) on the microstructure and critical current density of Cu/Nb-sheathed MgB2 wires has been studied using Mg1-x PGMxB2 powders with low doping levels. It was found that Pt and Pd do not enter the MgB2 lattice and have only limited....... The results are discussed in comparison with previous investigations using other transition metals for doping on the Mg site....

  9. Flórula ruderal da cidade de Lavras, MG Ruderal plants from Lavras, MG

    Manuel Losada Gavilanes


    Full Text Available Efetuou-se o levantamento e a identificação das plantas ruderais ocorrentes na cidade de Lavras, MG. Foram identificadas 175 espécies, representando 122 gêneros, pertencentes a 41 famílias. As famílias. Compositae, Leguminosae, Graminese, Malvaceae, Convolvulaceae, Cyperaceae, Euphorbiaceae e Amaranthaceae, são as que apresentaram o maior número de espécies. O material foi coletado em áreas ajardinadas, beiras de caminhos, calçadas, muros e cercas, e em terrenos baldios.A survey and identification of ruderal plants occuring in Lavras City, state of Minas Gerais, Brazil, was carried out. One hundred and seventy five species, representing 122 genera belonging to 41 families were indentified. Families Compositae, Leguminosae, Gramineae, Malvaceae, Convolvulaceae, Cyperaceae, Euphorbiaceae, and Amaranthaceae presented the greatest numbers of species among all families. All plant materials were collected in garden areas, along roadsides and streets, walls and fences, and wastelands.

  10. Theoretical Limiting Potentials in Mg/O2 Batteries

    Smith, Jeffrey G.; Naruse, Junichi; Hiramatsu, Hidehiko


    A rechargeable battery based on a multivalent Mg/O2 couple is an attractive chemistry due to its high theoretical energy density and potential for low cost. Nevertheless, metal-air batteries based on alkaline earth anodes have received limited attention and generally exhibit modest performance....... In addition, many fundamental aspects of this system remain poorly understood, such as the reaction mechanisms associated with discharge and charging. The present study aims to close this knowledge gap and thereby accelerate the development of Mg/O2 batteries by employing first-principles calculations...... by the presence of large thermodynamic overvoltages. In contrast, MgO2-based cells are predicted to be much more efficient: superoxide-terminated facets on MgO2 crystallites enable low overvoltages and round-trip efficiencies approaching 90%. These data suggest that the performance of Mg/O2 batteries can...

  11. Electron Theory Research in Mg-Y Alloy

    郭旭涛; 何良菊; 李培杰; 曾大本


    Adding yttrium to magnesium can improve the mechanical properties,especially the mechanical behavior at high temperature.The valence electron structures of Mg-Y alloy were analyzed with the empirical electron theory of solids and molecules(EET).Calculation shows that yttrium is on the fifth hybrid level and magnesium is on the third one in pure metal crystals.By comparing with aluminum in Mg-Al alloy,it is shown that the reason why the solution strengthening effect of yttrium is better than that of aluminum in Mg-Al alloy is the enhanced bond energy according to EET.And it is concluded from EET analysis that intermetallics Mg24Y5 can significantly improve the properties of magnesium alloys because yttrium atoms occupy the centers of the octahedron and Mg-Y bonds efficiently strengthen the alloy matrix.

  12. Microstructure and properties of Mg-Al binary alloys

    ZHENG Wei-chao


    Full Text Available The effects of different amounts of added Al, ranging from 1 % to 9 %, on the microstructure and properties of Mg-Al binary alloys were investigated. The results showed that when the amount of added Al is less than 5%, the grain size of the Mg-Al binary alloys decreases dramatically from 3 097 μm to 151 μm with increasing addition of Al. Further addition of Al up to 9% makes the grain size decrease slowly to 111 μm. The α-Mg dendrite arms are also refined. Increasing the amount of added Al decreases the hot cracking susceptibility of the Mg-Al binary alloys remarkably, and enhances the micro-hardness of the α-Mg matrix.

  13. Microstructure and properties of Mg-Al binary alloys

    ZHENG Wei-chao; LI Shuang-shou; TANG Bin; ZENG Da-ben


    The effects of different amounts of added Al, ranging from 1% to 9%, on the microstructure and properties of Mg-Al binary alloys were investigated. The results showed that when the amount of added Al is less than 5%, the grain size of the Mg-Al binary alloys decreases dramatically from 3 097 μm to 151 μm with increasing addition of Al. Further addition of Al up to 9% makes the grain size decrease slowly to 111 μm. The α-Mg dendrite arms are also refined. Increasing the amount of added Al decreases the hot cracking susceptibility of the Mg-Al binary alloys remarkably, and enhances the micro-hardness of the α-Mg matrix.

  14. Chemical synthesis of superconducting MgB{sub 2} nanopowder

    Bansal, Narottam P., E-mail: [Materials and Structures Division, NASA Glenn Research Center, Cleveland, OH 44135 (United States); Goldsby, Jon C.; Rogers, Richard B. [Materials and Structures Division, NASA Glenn Research Center, Cleveland, OH 44135 (United States); Susner, Michael A.; Sumption, Michael D. [Center for Superconducting and Magnetic Materials, Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210 (United States)


    Highlights: • MgB{sub 2} nanopowder has been synthesized by chemical method. • Powder characterized by XRD and SEM. • Superconducting behavior confirmed by susceptibility and magnetization measurements. • Nanopowder will facilitate the fabrication of small diameter MgB{sub 2} filaments. - Abstract: Superconducting MgB{sub 2} nanopowder has been synthesized through chemical reaction between lithium borohydride and magnesium hydride at relatively low temperatures. From quantitative Rietveld analysis, the average crystallite size of MgB{sub 2} powder was evaluated to be 33 nm. The superconducting transition temperature of the MgB{sub 2} nanopowder was found to be 38.8-38.9 K from magnetization and DC susceptibility measurements. Powder morphology has been evaluated by scanning electron microscopy.

  15. Synthesis and Thermodynamic Properties of MgO·B2O3·4H2O

    LIU,Zhi-Hong(刘志宏); GAO,Shi-Yang(高世扬); HU,Man-Cheng(胡满成); XIA,Shu-Ping(夏树屏)


    A new magnesium borate MgO@ B2O3 @ 4H2O was synthesized by the method of phase transformation of double salt and characterized by XRD, IR spectra and TG. The structural formula of this compound was Mg[B2O(OH)6] @H2O. The enthalpy of solution of MgO@B2O3@4H2O in HCl (1.0492 mol@ L-1) was determined. With the incorporation of the standard molar enthalpies of formation of MgO (s), H3BO3(s), and H2O (Ⅰ),the standard molar enthalpy of formation of - (3135.31 ±1.68) kJ@ mol-1 of MgO@B2O3@4H2O was obtained. Thermodynamic properties of this compoumd were also calculated by group contribution method.

  16. Ordered groups and infinite permutation groups


    The subjects of ordered groups and of infinite permutation groups have long en­ joyed a symbiotic relationship. Although the two subjects come from very different sources, they have in certain ways come together, and each has derived considerable benefit from the other. My own personal contact with this interaction began in 1961. I had done Ph. D. work on sequence convergence in totally ordered groups under the direction of Paul Conrad. In the process, I had encountered "pseudo-convergent" sequences in an ordered group G, which are like Cauchy sequences, except that the differences be­ tween terms of large index approach not 0 but a convex subgroup G of G. If G is normal, then such sequences are conveniently described as Cauchy sequences in the quotient ordered group GIG. If G is not normal, of course GIG has no group structure, though it is still a totally ordered set. The best that can be said is that the elements of G permute GIG in an order-preserving fashion. In independent investigations around that t...

  17. Effect of Calcination at Synthesis of Mg-Al Hydrotalcite Using co-Precipitation Method

    Niar Kurnia Julianti


    Full Text Available The use of hydrotalcite in catalysis has wide attention in academic research and industrial parties. Based on its utilization, hydrotalcite can be active catalyst or support. This research is focused on the investigation of characteristic like spesific surface area of Mg-Al hydrotalcite which is prepared with different temperature of calcination. Synthesis of Mg-Al hydrotalcites with Mg/Al molar ratio 3:1 were prepared by co-precipitation method. Mg(NO33.6H2O and Al(NO33.9H2O as precursors of Mg-Al hydrotalcite. Na2CO3 was used as precipitant agent and NaOH was used as buffer solution. The solution was mixed and aging for 5 hours at 650oC. The dried precipitate was calcined at 2500oC, 3500oC, 4500oC, 5500oC and 6500oC. The characterization of functional group was determined by Fourier Transform Infra Red (FT-IR. The Identical peaks diffractogram were analyzed by X-Ray Diffraction (XRD. The spesific surface area was determined by adsorption-desorption of nitrogen. The largest surface area that obtained from the calcination temperature of 650oC is 156.252 m2/g.

  18. Exploring several different routes to produce Mg- based nanomaterials for Hydrogen storage

    Leiva, D. R.; Chanchetti, L. F.; Floriano, R.; Ishikawa, T. T.; Botta, W. J.


    Severe mechanical processing routes based on high-energy ball milling (HEBM) or severe plastic deformation (SPD) can be used to produce Mg nanomaterials for hydrogen storage applications. In the last few years, we have been exploring in our research group different SPD processing routes in Mg systems to achieve good activation (first hydrogenation) and fast H-absorption/desorption kinetics, combined with enhanced air resistance. In this paper, we compare SPD techniques applied to Mg with HEBM applied to MgH2. Both advanced - melt spinning (MS), high-pressure torsion (HPT) - and more conventional - cold rolling (CR), cold forging (CF)- techniques are evaluated as means of production of bulk samples with very refined microstructures and controlled textures. In the best SPD processing conditions, attractive H-absorption/desorption kinetic properties are obtained, which are comparable to the ones of MgH2 milled powders, even if the needed temperatures are higher - 350°C compared to 300°C.CR and CF stand out as the processes with higher potential for industrial application, considering the level of the attained hydrogen storage properties, its simplicity and low cost.

  19. Mg Isotope Fractionation Between E. coli and Growth Medium

    Basset, R.; Lemelle, L.; Albalat, E.; Telouk, P.; Albarède, F.


    Magnesium is a major element in both microbial cells and minerals, immune to redox conditions and atmospheric interactions. In organic cells, Mg can be associated with membranes, with cytoplasm (either as an isolated ion or bound to proteins). Its isotope composition can be used to constrain the contribution of organic material to carbonate fluxes and the overall cycle of this element in the exogenous environment [1, 2]. Cells of DH5α E. coli strain were grown in Luria Broth medium and the Mg isotope fractionation between the cells and their growth medium determined after calcination in Pt crucibles, chemical purification by cation exchange chemistry in HCl medium [3] and isotopic analysis on a Nu HR MC-ICPMS. The yield is better than 96%. The Mg contents of 2.19 ± 0.08 mg per g DW in cells and 0.117 ± 0.001 mg per g DW in Luria Broth medium are consistent with literature data [4]. About half of the Mg initially present in the LB medium is taken up by the growing cells. At high cellular concentrations (OD600 = 3.5), cells are enriched in 26Mg by 0.97 ± 0.14 ‰ with respect to the culture medium. Although E. coli may not be a good proxy for oceanic plankton, such a substantial fractionation of Mg isotopes suggests that incorporation of even a few percent organic matter into oceanic oozes depletes oceanic Mg in its heavy isotopes and therefore accounts for the isotopic difference between riverine and marine Mg. [1] Drever, The Sea 5 (1974) 337-357 [2] Tipper et al., EPSL 250 (2006) 241-253 [3] Chang et al., JAAS 18 (2003) 296-301 [4] Outten et al., Science 292 (2001), 2488-2492

  20. Hydrogen reversibility of LiBH₄-MgH₂-Al composites.

    Hansen, Bjarne R S; Ravnsbæk, Dorthe B; Skibsted, Jørgen; Jensen, Torben R


    The detailed mechanism of hydrogen release in LiBH4-MgH2-Al composites of molar ratios 4 : 1 : 1 and 4 : 1 : 5 are investigated during multiple cycles of hydrogen release and uptake. This study combines information from several methods, i.e., in situ synchrotron radiation powder X-ray diffraction, (11)B magic-angle spinning (MAS) NMR, Sievert's measurements, Fourier transform infrared spectroscopy and simultaneous thermogravimetric analysis, differential scanning calorimetry and mass spectroscopy. The composites of LiBH4-MgH2-Al are compared with the behavior of the LiBH4-Al and LiBH4-MgH2 systems. The decomposition pathway of the LiBH4-MgH2-Al system is different for the two investigated molar ratios, although it ultimately results in the formation of LiAl, Mg(x)Al(1-x)B2 and Li2B12H12 in both cases. For the 4 : 1 : 1-molar ratio, Mg(0.9)Al(0.1) and Mg17Al12 are observed as intermediates. However, only Mg is observed as an intermediate in the 4 : 1 : 5-sample, which may be due to an earlier formation of Mg(x)Al(1-x)B2, reflecting the complex chemistry of Al-Mg phases. Hydrogen release and uptake reveals a decrease in the hydrogen storage capacity upon cycling. This loss reflects the formation of Li2B12H12 as observed by (11)B NMR and infrared spectroscopy for the cycled samples. Furthermore, it is shown that the Li2B12H12 formation can be limited significantly by applying moderate hydrogen partial pressure during decomposition.

  1. Resetting of Mg isotopes between calcite and dolomite during burial metamorphism: Outlook of Mg isotopes as geothermometer and seawater proxy

    Hu, Zhongya; Hu, Wenxuan; Wang, Xiaomin; Lu, Yizhou; Wang, Lichao; Liao, Zhiwei; Li, Weiqiang


    Magnesium isotopes are an emerging tool to study the geological processes recorded in carbonates. Calcite, due to its ubiquitous occurrence and the large Mg isotope fractionation associated with the mineral, has attracted great interests in applications of Mg isotope geochemistry. However, the fidelity of Mg isotopes in geological records of carbonate minerals (e.g., calcite and dolomite) against burial metamorphism remains poorly constrained. Here we report our investigation on the Mg isotope systematics of a dolomitized Middle Triassic Geshan carbonate section in eastern China. Magnesium isotope analysis was complemented by analyses of Sr-C-O isotopic compositions, major and trace element concentrations, and petrographic and mineralogical features. Multiple lines of evidence consistently indicated that post-depositional diagenesis of carbonate minerals occurred to the carbonate rocks. Magnesium isotope compositions of the carbonate rocks closely follow a mixing trend between a high δ26Mg dolomite end member and a low δ26Mg calcite end member, irrespective of sample positions in the section and calcite/dolomite ratio in the samples. By fitting the measured Mg isotope data using a two-end member mixing model, an inter-mineral Δ26Mgdolomite-calcite fractionation of 0.72‰ was obtained. Based on the experimentally derived Mg isotope fractionation factors for dolomite and calcite, a temperature of 150-190 °C was calculated to correspond to the 0.72‰ Δ26Mgdolomite-calcite fractionation. Such temperature range matches with the burial-thermal history of the local strata, making a successful case of Mg isotope geothermometry. Our results indicate that both calcite and dolomite had been re-equilibrated during burial metamorphism, and based on isotope mass balance of Mg, the system was buffered by dolomite in the section. Therefore, burial metamorphism may reset Mg isotope signature of calcite, and Mg isotope compositions in calcite should be dealt with caution in

  2. Effect of Mg content on microstructure and corrosion behavior of hot dipped Zn–Al–Mg coatings

    Yao, Caizhen; Lv, Haibing [Research Centre of Laser Fusion, CAEP, P.O.Box 919-988-5, Mianyang, Sichuan 621900 (China); Zhu, Tianping [Department of Chemical and Materials Engineering, The University of Auckland, PB 92019, Auckland 1142 (New Zealand); Zheng, Wanguo [Research Centre of Laser Fusion, CAEP, P.O.Box 919-988-5, Mianyang, Sichuan 621900 (China); Yuan, Xiaodong, E-mail: [Research Centre of Laser Fusion, CAEP, P.O.Box 919-988-5, Mianyang, Sichuan 621900 (China); Gao, Wei, E-mail: [Department of Chemical and Materials Engineering, The University of Auckland, PB 92019, Auckland 1142 (New Zealand)


    In this article, Zn–Al–Mg coatings were prepared by hot dipping method. The surface morphology, cross–section microstructure, microhardness, composition, corrosion behaviour of ZAM coatings were investigated by using X–ray diffraction (XRD), Optical microscope, Environmental scanning electron microscopy equipped with EDS (FESEM–EDS), Microhardness tester and Electrochemical analysis respectively. Corrosion test was also performed in a standard salt fog spray chamber. Microstructure studies indicates that Zn grain size was refined and eutectic areas at Zn grain boundary areas increased with increasing Mg content. ZA5M1.5 and ZA5M2 coatings have two distinct layers. Mg tends to exist in the outer layer while Al is in the inner layer. The inner layer is composed of Al{sub 5}Fe{sub 2}Zn{sub 0.4} intermetallic, which may to contribute to the microhardness. The outer layer is Zn grains surrounded by Zn–Mg etutectics, which may improve the corrosion resistance. The microhardness is more than 700 HV{sub 50g} for Al-rich layer and around 151 HV{sub 25g} for Mg-rich layer. The improved corrosion resistance of Zn–5%Al-1.5%Mg coating comes from the corrosion product of flocculent type simonkolleite, which prolongs the micro-path and impedes the movement of O{sub 2} and H{sub 2}O, ultimately retards the overall corrosion process. - Highlights: • Two-layer structured Zn–Al–Mg coatings were prepared by hot dipping method. • Mg exists in the outer layer while Al exists in the inner layer of Zn–Al–Mg coating. • Zn–Al–Mg coating has better protective ability than Zn and Zn–Al coatings. • The Mg-modified simonkolleite is the reason of the enhanced corrosion resistance.

  3. The role of Mg dopant on the morphological, structural and optical properties of Mg doped zinc oxide grown through hydrothermal method

    Susetyo, P.; Fauzia, V.; Sugihartono, I.


    ZnO nanorods is a low cost II-VI semiconductor compound with huge potential to be applied in optoelectronic devices i.e. light emitting diodes, solar cells, gas sensor, spintronic devices and lasers. In order to improve the electrical and optical properties, group II, III and IV elements were widely investigated as dopand elements on ZnO. In this work, magnesium (Mg) was doped into ZnO nanorods. Samples were prepared firstly by deposition of undoped ZnO seed layer on indium thin oxide coated glass substrates by ultrasonic spray pyrolysis method and then followed by the growth of ZnO nanorods doped by three different Mg concentrations by hydrothermal method. Based on the morphological, microstructural and optical characterizations results, it is concluded that the increase of magnesium concentration tends to reduce the diameter of ZnO nanorods, increases the bandgap energy and decreases the UV absorption the luminescence in UV and visible range.

  4. Effects of huaier aqueous extract on apoptosis, migration and invasion of osteosarcoma MG63 cells%槐耳浸膏对骨肉瘤 MG63细胞凋亡、迁移和侵袭的影响

    崔洋; 刘伟东; 史进; 孟红梅


    Objective To investigate the apoptosis , migration and invasion of ostosarcoma MG 63 cells exposed different doses of huaier in vitro.Methods Ostosarcoma MG63 cells were administrated with gradient doses of huaier at 0 mg/ml,1 mg/ml,2 mg/ml,4 mg/ml for 24 h,48 h and 72 h.Cell viability was measured by Cell Counting Kits-8(CCK-8).The distribution of cell-cycle and the rate of apoptosis were analyzed by flow cytometry . The migratory ability of cells was observed by scratch assay .The invasive capability of cells was deteced by transwell assay.Results Compared to the control group,the viabilities of osteosarcoma MG63 cells exposed gradient doses of huaier were significantly inhibited ( P<0.01 ) .The results of flow cytometry revealed that huaier could induce G 2 cell-cycle arrest and promote the apoptosis of MG63 cells(P<0.01).The scratch assay suggested that huaier could inhibited the migratory ability of MG63 cells(P<0.01).Furthermore,the invasiveness of MG63 cells was obviously suppressed by huaier ( P<0.01 ) .Conclusion Huaier could inhibit the proliferation , migration and invasion and promote the apoptosis of osteosarcoma MG 63 cells in vitro.%目的探讨槐耳浸膏对体外骨肉瘤MG63细胞的凋亡、转移和侵袭的影响。方法不同浓度的槐耳浸膏(0、1.0 mg/ml、2.0 mg/ml和4.0 mg/ml)作用于体外培养的骨肉瘤MG63细胞24 h、48 h和72 h。采用细胞增殖与毒性检测方法( CCK-8法),测定槐耳对细胞活力的影响;通过流式细胞仪检测槐耳对细胞周期及凋亡的影响;采用细胞划痕实验观察槐耳对细胞迁移能力的影响;通过Transwell实验检测槐耳对细胞侵袭能力的影响。结果和对照组相比,2.0 mg/ml和4.0 mg/ml浓度的槐耳作用于骨肉瘤MG63细胞24 h、48 h、72 h后可以抑制细胞的活力( P均<0.01);流式细胞仪分析结果显示,槐耳可以将大鼠MG63细胞周期阻滞于G2期( P均<0.01),可以促进大鼠MG63

  5. Long-term retention on treatment with lumiracoxib 100 mg once or twice daily compared with celecoxib 200 mg once daily: A randomised controlled trial in patients with osteoarthritis

    Notter Marianne


    Full Text Available Abstract Background The efficacy, safety and tolerability of lumiracoxib, a novel selective cyclooxygenase-2 (COX-2 inhibitor, has been demonstrated in previous studies of patients with osteoarthritis (OA. As it is important to establish the long-term safety and efficacy of treatments for a chronic disease such as OA, the present study compared the effects of lumiracoxib at doses of 100 mg once daily (o.d. and 100 mg twice daily (b.i.d. with those of celecoxib 200 mg o.d. on retention on treatment over 1 year. Methods In this 52-week, multicentre, randomised, double-blind, parallel-group study, male and female patients (aged at least 40 years with symptomatic primary OA of the hip, knee, hand or spine were randomised (1:2:1 to lumiracoxib 100 mg o.d. (n = 755, lumiracoxib 100 mg b.i.d. (n = 1,519 or celecoxib 200 mg o.d. (n = 758. The primary objective of the study was to demonstrate non-inferiority of lumiracoxib at either dose compared with celecoxib 200 mg o.d. with respect to the 1-year retention on treatment rate. Secondary outcome variables included OA pain in the target joint, patient's and physician's global assessments of disease activity, Short Arthritis assessment Scale (SAS total score, rescue medication use, and safety and tolerability. Results Retention rates at 1 year were similar for the lumiracoxib 100 mg o.d., lumiracoxib 100 mg b.i.d. and celecoxib 200 mg o.d. groups (46.9% vs 47.5% vs 45.3%, respectively. It was demonstrated that retention on treatment with lumiracoxib at either dose was non-inferior to celecoxib 200 mg o.d. Similarly, Kaplan-Meier curves for the probability of premature discontinuation from the study for any reason were similar across the treatment groups. All three treatments generally yielded comparable results for the secondary efficacy variables and all treatments were well tolerated. Conclusion Long-term treatment with lumiracoxib 100 mg o.d., the recommended dose for OA, was as effective and well

  6. Single-particle and collective motion in unbound deformed $ ^{39}\\text{Mg} $

    Fossez, K; Michel, N; Liu, Quan; Nazarewicz, W


    Background: Deformed neutron-rich magnesium isotopes constitute a fascinating territory where the interplay between collective rotation and single-particle motion is strongly affected by the neutron continuum. The unbound $fp$-shell nucleus $ ^{39}\\text{Mg} $ is an ideal candidate to study this interplay. Purpose: In this work, we predict the properties of low-lying resonant states of $ ^{39}\\text{Mg} $, using a suite of realistic theoretical approaches rooted in the open quantum system framework. Method: To describe the spectrum and decay modes of $ ^{39}\\text{Mg} $ we use the conventional Shell Model, Gamow Shell Model, Resonating Group Method, Density Matrix Renormalization Group method, and the non-adiabatic Particle-Plus-Rotor model formulated in the Berggren basis. Results: The unbound ground state of $ ^{39}\\text{Mg} $ is predicted to be either a $ J^{\\pi} = {7/2}^- $ state or a $ {3/2}^- $ state. A narrow $ J^{\\pi} = {7/2}^- $ ground-state candidate exhibits a resonant structure reminiscent of that of...

  7. Improved hydrogen sorption kinetics in wet ball milled Mg hydrides

    Meng, Li


    In this work, wet ball milling method is used in order to improve hydrogen sorption behaviour due to its improved microstructure of solid hydrogen materials. Compared to traditional ball milling method, wet ball milling has benefits on improvement of MgH{sub 2} microstructure and further influences on its hydrogen sorption behavior. With the help of solvent tetrahydrofuran (THF), wet ball milled MgH{sub 2} powder has much smaller particle size and its specific surface area is 7 times as large as that of dry ball milled MgH{sub 2} powder. Although after ball milling the grain size is decreased a lot compared to as-received MgH{sub 2} powder, the grain size of wet ball milled MgH{sub 2} powder is larger than that of dry ball milled MgH{sub 2} powder due to the lubricant effect of solvent THF during wet ball milling. The improved particle size and specific surface area of wet ball milled MgH{sub 2} powder is found to be determining its hydrogen sorption kinetics especially at relatively low temperatures. And it also shows good cycling sorption behavior, which decides on its industrial applicability. With three different catalysts MgH{sub 2} powder shows improved hydrogen sorption behavior as well as the cyclic sorption behavior. Among them, the Nb{sub 2}O{sub 5} catalyst is found to be the most effective one in this work. Compared to the wet ball milled MgH{sub 2} powder, the particle size and specific surface area of the MgH{sub 2} powder with catalysts are similar to the previous ones, while the grain size of the MgH{sub 2} with catalysts is much finer. In this case, two reasons for hydrogen sorption improvement are suggested: one is the reduction of the grain size. The other may be as pointed out in some literatures that formation of new oxidation could enhance the hydrogen sorption kinetics, which is also the reason why its hydrogen capacity is decreased compared to without catalysts. After further ball milling, the specific surface area of wet ball milled Mg

  8. First-principles study on mechanical properties of LaMg3 and LaCuMg2

    王明辉; 潘荣凯; 李鹏博; 卞楠; 唐壁玉; 彭立明; 丁文江


    With the substitution of part Mg in LaMg3by Cu, the elastic constantsC11 andC12 increase whileC44 decreases, implying an enhanced Poisson effect and smaller resistance to (100) shear. Furthermore, the bulk modulusB increases, while the shear modulusG, elastic modulusE and anisotropic ratioA are reduced. The calculated Debye temperature of LaCuMg2 is lower, implying the weaker interaction between atoms in LaCuMg2. Then, the stress-strain curves in entire range and the ideal strength at critical strain are studied. The present results show that the lowest ideal tensile strength for LaMg3 and LaCuMg2is in the direction. The ideal shear strength on the (110) slip system of LaMg3 is greater than LaCuMg2. The density of states and charge density distribution are further studied to understand the inherent mechanism of the mechanical properties.

  9. Improved Hydrogen Storage Properties of Mg(BH4)2-Mg(AlH4)2 Combined Systems

    Xiao, Haoyuan; Leng, Haiyan; Yu, Zhigang; Li, Qian; Chou, Kuo-Chih

    Magnesium borohydride and Magnesium alanate were synthesized by mechanochemical metathesis reaction. The thermal decomposition behaviors of Mg(BH4)2-nMg(AlH4)2(n=0.5,1) systems were investigated as potential hydrogen storage materials. The results showed that the systems started to desorb H2 at 120 °C and desorbed 3.9 wt.% and 4.9 wt.% H2 below 300 °C when n equals 0.5 and 1, respectively, while individual Mg(BH4)2 started to desorb H2 at 250 °C and desorbed only 0.82 wt.% H2. Because of the exist of the Mg(AlH4)2, the isothermal desorption kinetics of Mg(BH4)2 in the Mg(BH4)2-0.5Mg(AlH4)2 systems was 50% faster than that of pristine Mg(BH4)2. In addition, the re-hydrogenation rates also increased 49.4% and 37.9%.

  10. Microstructures and mechanical properties of Al-Mg and Al-Zn-Mg based alloys containing minor scandium and zirconium

    尹志民; 姜锋; 潘青林; 郭飞跃; 朱大鹏; 宋练鹏; 曾渝; 王涛


    A series of Al-Mg and Al-Zn-Mg based alloys with and without Sc, Zr were prepared by ingot metallurgy. The mechanical properties and microstructures of the studied alloys under different treatment conditions were studied. In addition, the existing form and acting mechanism of minor Sc and Zr in Al-Mg and Al-Zn-Mg based alloys were analyzed and discussed. The following conclusions can be drawn. First, adding of minor Sc and Zr to those alloys can increase the strength of Al-Mg and Al-Zn-Mg based alloys by 25%, while the ductility can remain in 15% and 8%, respectively. Second, in Al-Mg and Al-Zn-Mg based alloys, minor Sc and Zr mainly exist in two forms of aluminides containing Sc and Zr, one is Al3(Sc,Zr)I precipitated from the melt during solidification, the other is Al3(Sc,Zr)Ⅱ precipitated during homogenization. The former is the most effective grain refiner for α(Al) solid solution matrix, and the latter is coherent with the matrix and can strongly pin dislocations and subboundaries, which can effectively restrain recrystallization of the alloys during hot deformation, annealing and solid solution. Third, strengthening caused by adding minor Sc and Zr to the studied alloys is mainly due to fine-grain strengthening, precipitation strengthening and substructure strengthening of Al3(Sc, Zr) caused by restraining recrystallization.

  11. The epithelial Mg2+ channel transient receptor potential melastatin 6 is regulated by dietary Mg2+ content and estrogens.

    Groenestege, W.M.; Hoenderop, J.G.J.; Heuvel, L.P.W.J. van den; Knoers, N.V.A.M.; Bindels, R.J.M.


    The kidney is the principal organ responsible for the regulation of the body Mg(2+) balance. Identification of the gene defect in hypomagnesemia with secondary hypocalcemia recently elucidated transient receptor potential melastatin 6 (TRPM6) as the gatekeeper in transepithelial Mg(2+) transport, wh

  12. Phosphatizing of Mg particles to improve the protective performance of Mg-rich primer on A2024 Al alloy

    Wang, Jianguo; Zuo, Yu; Tang, Yuming; Lu, Xiangyu


    Mg-rich primer as a new type protective coating provides cathodic protection for Al alloy. In this paper, a kind of phosphatizing surface treatment on Mg particles was studied in order to improve the protective performance of Mg-rich primer. After treated with phosphoric acid, a protective magnesium phosphate layer was formed on the surface of Mg particles, which had no negative influence on the cathodic protection of the Mg-rich primer for Al alloy. The coating resistance of the treated Mg-rich primer was bigger than that of untreated primer, meanwhile the coating capacitance of the treated Mg-rich primer was smaller than that of untreated primer, suggesting that the barrier effect of the primer was improved and the lifetime was extended. The magnesium phosphate layer could reduce the consumption rate of Mg particles. Meanwhile, the phosphate radicals transported to Al alloy substrate to form a product layer composed of magnesium phosphate and aluminum phosphate on the substrate surface, which decreased the corrosion rate of Al alloy and improved the protective performance of the primer.

  13. Laser cladding of a Mg based Mg-Gd-Y-Zr alloy with Al-Si powders

    Chen, Erlei; Zhang, Kemin; Zou, Jianxin


    In the present work, a Mg based Mg-Gd-Y-Zr alloy was subjected to laser cladding with Al-Si powders at different laser scanning speeds in order to improve its surface properties. It is observed that the laser clad layer mainly contains Mg2Si, Mg17Al12 and Al2(Gd,Y) phases distributed in the Mg matrix. The depth of the laser clad layer increases with decreasing the scanning speed. The clad layer has graded microstructures and compositions. Both the volume fraction and size of Mg2Si, Mg17Al12 and Al2(Gd,Y) phases decreases with the increasing depth. Due to the formation of these hardening phases, the hardness of clad layer reached a maximum value of HV440 when the laser scanning speed is 2 mm/s, more than 5 times of the substrate (HV75). Besides, the corrosion properties of the untreated and laser treated samples were all measured in a NaCl (3.5 wt.%) aqueous solution. The corrosion potential was increased from -1.77 V for the untreated alloy to -1.13 V for the laser clad alloy with scanning rate of 2 mm/s, while the corrosion current density was reduced from 2.10 × 10-5 A cm-2 to 1.64 × 10-6 A cm-2. The results show that laser cladding is an efficient method to improve surface properties of Mg-Rare earth alloys.

  14. Simulating GTP:Mg and GDP:Mg with a simple force field: a structural and thermodynamic analysis.

    Simonson, Thomas; Satpati, Priyadarshi


    Di- and tri-phosphate nucleotides are essential cofactors for many proteins, usually in an Mg(2+) -bound form. Proteins like GTPases often detect the difference between NDP and NTP and respond by changing conformations. To study such complexes, simple, fixed charge force fields have been used, which allow long simulations and precise free energy calculations. The preference for NTP or NDP binding depends on many factors, including ligand structure and Mg(2+) coordination and the changes they undergo upon binding. Here, we use a simple force field to examine two Mg(2+) coordination modes for the unbound GDP and GTP: direct, or "Inner Sphere" (IS) coordination by one or more phosphate oxygens and indirect, "Outer Sphere" (OS) coordination involving one or more bridging waters. We compare GTP: and GDP:Mg binding with OS and IS coordination; combining the results with experimental data then indicates that GTP prefers the latter. We also examine different kinds of IS coordination and their sensitivity to a key force field parameter: the optimal Mg:oxygen van der Waals distance Rmin . Increasing Rmin improves the Mg:oxygen distances, the GTP: and GDP:Mg binding affinities, and the fraction of GTP:Mg with β + γ phosphate coordination, but does not improve or change the GTP/GDP affinity difference, which remains much larger than experiment. It has no effect on the free energy of GDP binding to a GTPase. Copyright © 2012 Wiley Periodicals, Inc.

  15. Effect of Synthesized MgNi4Y Catalyst on Hydrogen Desorption Properties of Milled MgH2

    ChitsazKhoyi, Leila; Raygan, Shahram; Pourabdoli, Mehdi


    It has been reported that ball milling and adding catalyst can improve hydrogen desorption properties of MgH2. In this study, simultaneous effect of adding catalyst and ball milling on hydrogen desorption properties of MgH2 was studied. Mechanical alloying and heat treatment methods were used to synthesize MgNi4Y intermetallic as a catalyst. In this regard, pure Mg, Ni, and Y elemental powders were ball milled in different conditions and then heat treated at 1073 K (800 °C) for 4 hours. XRD and FESEM methods were used to investigate properties of the samples. It was found that, after 10 hours of ball milling and then heat treating at 1073 K (800 °C), MgNi4Y intermetallic was formed almost completely. The results of Sievert tests showed that as-received MgH2 did not release any significant amount of hydrogen at 623 K (350 °C). But, after ball milling for 10 hours, 0.8 wt pct hydrogen was released from MgH2 at 623 K (350 °C) in 40 minutes. Adding 10 wt pct catalyst via ball milling to MgH2 led to releasing 3.5 wt pct hydrogen in the same conditions. In addition, increasing ball milling time from 10 to 65 hours increased the amount of released hydrogen from 51 to 85 pct of theoretical hydrogen desorption value and improved kinetic of desorption process.

  16. Low temperature phase transition and crystal structure of CsMgPO{sub 4}

    Orlova, Maria, E-mail: [Institute of Mineralogy and Petrography, University of Innsbruck, Innrain 52, Innsbruck 6020 (Austria); Khainakov, Sergey [Departamento de Química Física y Analítica, Universidad de Oviedo—CINN, 33006 Oviedo (Spain); Servicios Científico Técnicos, Universidad de Oviedo, 33006 Oviedo (Spain); Michailov, Dmitriy [Department of Chemistry, University of Nizhny Novgorod, 23 Gagarin av., Nizhny Novgorod 603950 (Russian Federation); Perfler, Lukas [Institute of Mineralogy and Petrography, University of Innsbruck, Innrain 52, Innsbruck 6020 (Austria); Langes, Christoph [Institute of Pharmacy, University of Innsbruck, Innrain 52, Innsbruck 6020 (Austria); Kahlenberg, Volker [Institute of Mineralogy and Petrography, University of Innsbruck, Innrain 52, Innsbruck 6020 (Austria); Orlova, Albina [Department of Chemistry, University of Nizhny Novgorod, 23 Gagarin av., Nizhny Novgorod 603950 (Russian Federation)


    CsMgPO{sub 4} doped with radioisotopes is a promising compound for usage as a radioactive medical source. However, a low temperature phase transition at temperatures close to ambient conditions (∼−40 °C) was observed. Information about such kind of structural changes is important in order to understand whether it can cause any problem for medical use of this compound. The phase transition has been investigated in detail using synchrotron powder diffraction, Raman spectroscopy and DFT calculations. The structure undergoes a transformation from an orthorhombic modification, space group Pnma (RT phase) to a monoclinic polymorph, space group P2{sub 1}/n (LT phase). New LT modification adopts similar to RT but slightly distorted unit cell: a=9.58199(2) Å, b=8.95501(1) Å, c=5.50344(2) Å, β=90.68583(1)°, V=472.198(3) Å{sup 3}. CsMgPO{sub 4} belongs to the group of framework compounds and is made up of strictly alternating MgO{sub 4}- and PO{sub 4}-tetrahedra sharing vertices. The cesium counter cations are located in the resulting channel-like cavities. Upon the transformation a combined tilting of the tetrahedra is observed. A comparison with other phase transitions in ABW-type framework compounds is given. - Graphical abstract: Structural behavior of β-tridymite-type phosphate CsMgPO{sub 4}, considered as potential chemical form for radioactive Cs-source has been studied at near ambient temperatures. A phase transition at (∼−40 °C) has been found and investigated. It has been established that the known orthorhombic RT modification, space group Pnma, adopts a monoclinic cell with space group P2{sub 1}/n at low temperatures. In this paper, we present results of structural analysis of changes accompanying this phase transition and discuss its possible impact on the application properties. - Highlights: • β-Tridymite type phosphate CsMgPO{sub 4} undergoes so called translationengleiche phase transition of index 2 at −40 °C. • The structure

  17. Communication in Organizational Groups

    Monica RADU


    Organizational group can be defined as some persons between who exist interactive connections (functional, communication, affective, normative type). Classification of these groups can reflect the dimension, type of relationship or type of rules included. Organizational groups and their influence over the individual efficiency and the efficiency of the entire group are interconnected. Spontaneous roles in these groups sustain the structure of the relationship, and the personality of each indi...

  18. Preparation of MgB2 Superconducting Materials%MgB2超导材料的制备




  19. Effects of Mg content on pore structure and electrochemical corrosion behaviors of porous Al-Mg alloys

    何文远; 肖逸锋; 吴靓; 许艳飞; 钱锦文; 贺跃辉; 郑学军


    Porous Al-Mg alloys with different nominal compositions were successfully fabricated via elemental powder reactive synthesis, and the phase composition, pore structure, and corrosion resistance were characterized with X-ray diffractometer, scanning electron microscope and electrochemical analyzer. The volume expansion ratio, open porosity and corrosion resistance in 3.5% (mass fraction) NaCl aqueous solution of the alloys increase at first and then decrease with the increase of Mg content. The maxima of volume expansion ratio and open porosity are 18.3% and 28.1% for the porous Al-56%Mg (mass fraction) alloy, while there is the best corrosion resistance for the porous Al-37.5% Mg (mass fraction) alloy. The pore formation mechanism can be explained by Kirkendall effect, and the corrosion resistance can be mainly affected by the phase composition for the porous Al-Mg alloys. They would be of the potential application for filtration in the chloride environment.

  20. Fabrication and spectroscopic properties of transparent Nd3+:MgO and Er3+:MgO ceramics

    Sanamyan, T.; Cooper, C.; Gilde, G.; Sutorik, A. C.; Dubinskii, M.


    We present the results of the development and comprehensive characterization of fully densified Er3+:MgO and Nd3+:MgO transparent ceramics fabricated from specially formulated nanopowders. Also presented are the spectroscopic characterization results (absorption, fluorescence and emission lifetimes) of Er3+ and Nd3+ dopant ions in MgO in the temperature range 10 to 300 K. To the best of our knowledge, this is the first reported successful demonstration of bulk MgO host material doped with rare earth (RE) ions. Spectroscopic results are indicative of a single-site RE ion incorporation with a nearly perfect single crystalline environment within the MgO ceramic grains. The results are presented with major emphasis on potential laser application and the outlook for substantially improved laser power scaling at room temperature based on the unique thermal properties of the host material.

  1. Possibility of a 2D SiC monolayer formation on Mg(0001) and MgO(111) substrates

    Kuzubov, A. A.; Eliseeva, N. S.; Krasnov, P. O.; Tomilin, F. N.; Fedorov, A. S.; Tolstaya, A. V.


    The geometrical characteristics of a 2D SiC monolayer on Mg(0001) and MgO(111) plates regarded as potential materials for growing two-dimensional silicon carbide were studied. The most favorable positions of the atoms of 2D SiC on the substrates were determined. In the 2D SiC/Mg(0001) system, unlike in 2D SiC/MgO(111), the deviation of the carbon atom from the silicon carbide monolayer was insignificant (0.08 Å). Consequently, magnesium can be used as a substrate for growing two-dimensional silicon carbide. The use of MgO(111) is not recommended because of a significant distortion of the 2D SiC surface.

  2. Fabrication of hierarchical core-shell polydopamine@MgAl-LDHs composites for the efficient enrichment of radionuclides

    Zhu, Kairuo; Lu, Songhua; Gao, Yang; Zhang, Rui; Tan, Xiaoli; Chen, Changlun


    Novel hierarchical core/shell structured polydopamine@MgAl-layered double hydroxides (PDA@MgAl-LDHs) composites involving MgAl-layered double hydroxide shells and PDA cores were fabricated thought one-pot coprecipitation assembly and methodically characterized by X-ray diffraction, Fourier transformed infrared spectroscopy, scanning/transmission electron microscopy, selected area electron diffraction, elemental mapping, thermogravimetric analysis and X-ray photoelectron spectroscopy technologies. U(VI) and Eu(III) sorption experiments showed that the PDA@MgAl-LDHs exhibited higher sorption ability with a maximum sorption capacity of 142.86 and 76.02 mg/g at 298 K and pH 4.5, respectively. More importantly, according to XPS analyses, U(VI) and Eu(III) were sorbed on PDA@MgAl-LDHs via oxygen-containing functional groups, and the chemical affinity of U(VI) by oxygen-containing functional groups is higher than that of Eu(III). These observations show great expectations in the enrichment of radionuclides from aquatic environments by PDA@MgAl-LDHs.

  3. Superconductivity in dense MgB2 wires.

    Canfield, P C; Finnemore, D K; Bud'ko, S L; Ostenson, J E; Lapertot, G; Cunningham, C E; Petrovic, C


    MgB2 becomes superconducting just below 40 K. Whereas porous polycrystalline samples of MgB2 can be synthesized from boron powders, in this Letter we demonstrate that dense wires of MgB2 can be prepared by exposing boron filaments to Mg vapor. The resulting wires have a diameter of 160 microm, are better than 80% dense, and manifest the full chi = -1/4pi shielding in the superconducting state. Temperature-dependent resistivity measurements indicate that MgB2 is a highly conducting metal in the normal state with rho(40 K) = 0.38 microOmega cm. By using this value, an electronic mean-free path, l approximately 600 A can be estimated, indicating that MgB2 wires are well within the clean limit. Tc, Hc2(T), and Jc data indicate that MgB2 manifests comparable or better superconducting properties in dense wire form than it manifests as a sintered pellet.


    郭冬丽; 宁佩芳; 袁媛


    Objective: To study the dynamic change and its diagnostic significance of MG7 expression in the process of gastric cancer development. Methods: The expression level of antigen MG7 was determined by immunohistochemistry method in 406 cases of gastric mucosa. The classification of intestinal metaplasia of gastric mucosa was determined by histochemistry method in 82 cases. Results: The positive rate of MG7 expression in normal gastric mucosa, intestinal metaplasia and dysplasia of gastric mucosa and gastric cancer were increased gradually (P<0.01). The positive rate of MG7 expression in superficial gastritis, atrophic gastritis and gastric cancer were increased on sequence (P<0.01). The positive rate of antigen MG7 expression in type Ⅲ intestinal metaplasia of gastric mucosa had significant difference,compared with that in type Ⅰ an Ⅱ intestinal metaplasia (P<0.05). Conclusion: MG7 antigen had close relationship with gastric cancer. Type Ⅲ intestinal metaplasia, atrophic gastritis and dysplasia should be followed up in order to improve the early detection of gastric cancer. MG7 antigen had great clinical value in the dynamic follow-up of gastric precursors.

  5. Oxidation and growth of Mg thin films on Ru(001)

    Huang, H. H.; Jiang, X.; Siew, H. L.; Chin, W. S.; Sim, W. S.; Xu, G. Q.


    The oxidation and growth of ultra-thin Mg films on a Ru(001) substrate have been studied using X-ray photoelectron spectroscopy (XPS) and thermal desorption spectroscopy (TDS) in the temperature range of 300-1500 K. Our results suggest that the growth of Mg thin films follows a layer-by-layer mode. Upon oxygen adsorption at 300 K, two O 1s peaks were detected on the Mg film. The peak at 532.2-532.6 eV could be attributed to either dioxygen or partially reduced species (O δ-, δfilm to 800 K causes the conversion of the dioxygen or partially reduced species to the oxide state. Thermal desorption peaks of MgO were directly detected at 1000-1127 and 1350-1380 K, respectively. However, initial evaporation of Mg atoms onto an oxygen pre-adsorbed surface yields a fully oxidized MgO. Further Mg deposition results in the formation of a partially oxidized film with the observation of an O 1s peak at 532.2 eV.

  6. Combustion and sensitivity characteristics of Mg/TF pyrolants

    Kuwahara, T.; Matsuo, S.; Shinozaki, N. [Aerospace Division, Nissan Motor Co Ltd, Saitama (Japan)


    Burning rate and sensitivity characteristics of energetic mixtures composed of metal particles and oxidizers, the so called `pyrolants`, were studied experimentally. The pyrolants tested were made of various particle sizes of magnesium (Mg) and poly-tetrafluoroethylene (TF). Mg/TF pyrolant produces high combustion flame temperature, so it is used as heat sources and igniter pyrolants. The maximum flame temperature (Tf) of Mg/TF pyrolant is 3271 K at 0.1 MPa, and 3483 K at 1 MPa. These values are obtained when Mg concentration is 30 %. When the Mg concentrations are less than 50 %, the pyrolants are not able to burn stably at one atmosphere. The burning rate increases with increasing concentration of Mg and decreases with increasing the mean diameter of Mg particles at constant pressure. Sensitivity characteristics were evaluated with drop hammer test and the weight used was 5 kg. Explosive energy decreased with increasing burning rate, so there is strong relationship between burning rate and explosive energy. (authors) 8 refs.

  7. Characterization of Mg2+ Distributions around RNA in Solution


    Binding of metal ions is an important factor governing the folding and dynamics of RNA. Shielding of charges in the polyanionic backbone allows RNA to adopt a diverse range of folded structures that give rise to their many functions within the cell. Some RNA sequences fold only in the presence of Mg2+, which may be bound via direct interactions or occupy the more diffuse “ion atmosphere” around the RNA. To understand the driving forces for RNA folding, it is important to be able to fully characterize the distribution of metal ions around the RNA. In this work, a combined Grand Canonical Monte Carlo-Molecular Dynamics (GCMC-MD) method is applied to characterize Mg2+ distributions around folded RNA structures. The GCMC-MD approach identifies known inner- and outer-shell Mg2+ coordination, while also predicting new regions occupied by Mg2+ that are not observed in crystal structures but that may be relevant in solution, including the case of the Mg2+ riboswitch, for which alternate Mg2+ binding sites may have implications for its function. This work represents a significant step forward in establishing a structural and thermodynamic description of RNA–Mg2+ interactions and their role in RNA structure and function. PMID:27819065

  8. Electronic Structure of New Superconducting Perovskite MgCNi3

    Li CHEN; Hua LI; Liangmo MEI


    The electronic structures of new superconducting perovskite MgCNis and related compounds MgCNi2T (T=Co, Fe,and Cu) have been studied using MS-Xα method. In MgCNi3, the main peak of density of states is located below the Fermi level and dominated by Ni d. From the results of total energy calculations, it was found that the number of Ni valence electron decreases faster for the Fe-doped case than that for the Co-doped case. The valence state of Ni changes from +1.43 in MgCNi2Co to +3.02 in MgCNi2Fe. It was confirmed that Co and Fe dopants in MgCNi3 behave as a source of d-band holes and the suppression of superconductivity occurs faster for the Fe-doped case than that for the Co-doped case. In order to explain the fact that Co and Fe dopants in MgCNi3 behave as a source of d-band holes rather than magnetic scattering centers that quench superconductivity, we have also investigated the effects of electron (Cu) doping on the superconductivity and found that both electron (Cu) doping and hole (Co, Fe)doping quench superconductivity exist. Comparing with the hole (Co) doping, there was no much difference between Cu and Co doping. This suggests that Co and Fe doping do not actas magnetic impurity.

  9. Synthesis of superconductor MgCNi3 with carbon nanotubes

    Xia Qing-Lin; Yi Jian-Hong; Peng Yuan-Dong; Luo Shu-Dong; Wang Hong-Zhong; Li Li-Ya


    MgCNia, an intermetallic compound superconductor with a cubic perovskite crystal structure, has been synthesized using fine Mg and Ni powders and carbon nanotubes (CNTs) as starting materials by the conventional powder metallurgy method. The composition, microstructure and superconductivity are characterized using x-ray diffraction (XRD), energy dispersive x-ray (EDX) analysis, scanning electron microscopy (SEM), and superconducting quantum interference device (SQUID) magnetometer. The results indicate that the phases of the synthesized samples are MgCNi3 (major phase) and traces of C and MgO. The MgCNi3 particle sizes range from several hundreds of nanometres to several micrometres.The onset superconducting transition temperature Tc of the MgCNi3 sample is about 7.2 K. The critical current density Jc is about 3.44 × 104 A/cm2 calculated according to the Bean model from the magnetization hysteresis loop of the slab MgCNi3 sample at 5 K and zero applied field.

  10. Integral Data Test of HENDL1.0/MG and VisualBUS with Neutronics Shielding Experiments (Ⅰ)

    高纯静; 许德政; 李静惊; 吴宜灿; 邓铁如


    HENDL1.0/MG, a multi-group working library of the Hybrid Evaluated Nuclear Data Library, was home-developed by the FDS Team of ASIPP (Institute of Plasma Physics, Chinese Academy of Sciences) on the basis of several national data libraries. To validate and qualify the process of producing HENDL1.0/MG, simulating calculations of a series of existent spherical shell benchmark experiments (Al, Mo, Co, Ti, Mn, W, Be and V) have been performed with HENDL1.0/MG and the multifunctional neutronics code system named VisualBUS home-developed also by FDS Team.

  11. A Redetermination of the Dissociation Energy of MgO(+)

    Bauschlicher, Charles W., Jr.; Langhoff, Stephen R.; Partridge, Harry


    In 1986, we reported a dissociation energy (D(sub 0) of 2.31 eV for the X(sup 2)Pi ground state of MgO(+). This value was determined by computing the dissociation energy to the Mg(2+) + O(-) limit and adjusting the value to the Mg(+) + O limit using the experimental Ionization Potential (IP) of Mg(+) and the Electron Affinity (EA) of O. The success of this method relies on the assumption that there is little covalent contribution to the bonding. The very small (0.04 eV) correlation contribution to the binding energy was taken as corroboration for the validity of this approach. Our earlier theoretical value was estimated to be accurate to at least 0.2 eV. It is in excellent agreement with the subsequent value of 2.30 +/- 0.13 eV determined by Freiser and co-workers from photodissociation experiments. It is also consistent with the upper (less than 3.1 eV) and lower (greater than 1.1 eV) bounds determined by Rowe obtained by studying the reactions of Mg(+) with 03 and NO2. However, it is inconsistent with an upper bound of 1.7 eV reported by Kappes and Staley based on their failure to observe MgO(+) in the reaction of Mg(+) with N2O. The picture became somewhat clouded, however, by the recent guided-ion beam mass spectrometric studies of Dalleska and Armentrout. Their initial analysis of the reaction data for Mg(+) + O2 lead to a bond dissociation energy of 2.92 +/- 0.25 eV, which is considerably larger than the value of 2.47 +/- 0.06 eV deduced from their studies of the Mg(+)+NO2 reaction.

  12. Fabrication of Mg2Si/AZ91D Composites from Mg-SiO2%Mg-SiO2体系制备Mg2Si/AZ91D复合材料的研究

    王军; 陈刚; 赵玉涛; 徐萌; 张道理; 黄康; 彭蕾


    采用原位合成技术制备了Mg2Si/AZ91D复合材料, 并通过光学显微镜(OM)、扫描电镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)等对添加碱土、稀土元素的影响进行了研究. 结果表明: AZ91D镁合金中加入SiO2(其中Si占合金质量的3%)后, 出现多边形状或树枝晶状的初生Mg2Si相, 以及汉字状的共晶Mg2Si相, 树枝晶状Mg2Si的平均尺寸约25~50 μm, 汉字状Mg2Si的平均尺寸约12~15 μm;Mg2Si对镁合金中的β-Mg17Al12相有细化作用. 添加Ca, Sr, Y对Mg2Si形貌、尺寸有明显的改善, 当添加0.9%Ca, 0.1%Sr, 0.5%RE(80%Y)变质处理后, Mg2Si形貌全部变为多边形状, 平均尺寸约0.8~5 μm.

  13. Fine-Filament MgB2 Superconductor Wire

    Cantu, Sherrie


    Hyper Tech Research, Inc., has developed fine-filament magnesium diboride (MgB2) superconductor wire for motors and generators used in turboelectric aircraft propulsion systems. In Phase I of the project, Hyper Tech demonstrated that MgB2 multifilament wires (MgB2 rotor coil packs for a superconducting generator. The ultimate goal is to enable low-cost, round, lightweight, low-AC-loss superconductors for motor and generator stator coils operating at 25 K in next-generation turboelectric aircraft propulsion systems.

  14. Superconductivity of metallic boron in MgB2.

    Kortus, J; Mazin, I I; Belashchenko, K D; Antropov, V P; Boyer, L L


    Boron in MgB2 forms stacks of honeycomb layers with magnesium as a space filler. Band structure calculations indicate that Mg is substantially ionized, and the bands at the Fermi level derive mainly from B orbitals. Strong bonding with an ionic component and considerable metallic density of states yield a sizable electron-phonon coupling. Together with high phonon frequencies, which we estimate via zone-center frozen phonon calculations to be between 300 and 700 cm(-1), this produces a high critical temperature, consistent with recent experiments. Thus MgB2 can be viewed as an analog of the long sought, but still hypothetical, superconducting metallic hydrogen.

  15. Ultrasonic Properties of the MgB2 Superconductor

    YU Ri-Cheng; JIN Chang-Qing; LI Shao-Chun; WANG Ru-Ju; LI Feng-Ying; LIU Zhen-Xing; ZHU Jia-Lin


    The sound velocities of longitudinal and shear waves are measured on a polycrystalline MgB2 superconductor with Tc of 39 K. The specimen used in the experiments is pressed and heated using the MgB2 powder. The elastic moduli, Debye temperature and specific heat at room temperature are obtained based on sound velocity data. The results indicate that the velocities are much higher than those in the usual materials, while elastic constants remain reasonably soft, which may be due to the high transition temperature of the MgB2 superconductor.


    Jiang, Weilin; Zhu, Zihua; Varga, Tamas; Bowden, Mark E.; Manandhar, Sandeep; Roosendaal, Timothy J.; Hu, Shenyang Y.; Henager, Charles H.; Kurtz, Richard J.; Wang, Yongqiang


    As a candidate material for fusion reactor designs, silicon carbide (SiC) under high-energy neutron irradiation undergoes atomic displacement damage and transmutation reactions that create magnesium as one of the major metallic products. The presence of Mg and lattice disorder in SiC is expected to affect structural stability and degrade thermo-mechanical properties that could limit SiC lifetime for service. We have initiated a combined experimental and computational study that uses Mg+ ion implantation and multiscale modeling to investigate the structural and chemical effects in Mg implanted SiC and explore possible property degradation mechanisms.

  17. Molecular dynamics of MgSiO3 perovskite melting

    Liu Zi-Jiang; Cheng Xin-Lu; Yang Xiang-Dong; Zhang Hong; Cai Ling-Cang


    The melting curve of MgSiO3 perovskite is simulated using molecular dynamics simulations method at high pressure. It is shown that the simulated equation of state of MgSiO3 perovskite is very successful in reproducing accurately the experimental data. The pressure dependence of the simulated melting temperature of MgSiO3 perovskite reproduces the stability of the orthorhombic perovskite phase up to high pressure of 13OGPa at ambient temperature, consistent with the theoretical data of the other calculations. It is shown that its transformation to the cubic phase and melting at high pressure and high temperature are in agreement with recent experiments.

  18. Group Psychotherapy in Iceland.

    Ívarsson, Ómar


    In this overview of group psychotherapy in Iceland, an attempt will be made to describe how it is practiced today, give some glimpses into its earlier history, and clarify seven issues: (1) the standing of group psychotherapy in Iceland, its previous history, and the theoretical orientation of dynamic group therapy in the country; (2) the role of group therapy in the health care system; (3) how training in group therapy is organized; (4) the relationship between group psychotherapy research and clinical practice; (5) which issues/processes can be identified as unique to therapy groups in Iceland; and (6) how important are group-related issues within the social background of the country; and (7) what group work holds for the future.

  19. Locally minimal topological groups

    enhofer, Lydia Au\\ss; Dikranjan, Dikran; Domínguez, Xabier


    A Hausdorff topological group $(G,\\tau)$ is called locally minimal if there exists a neighborhood $U$ of 0 in $\\tau$ such that $U$ fails to be a neighborhood of zero in any Hausdorff group topology on $G$ which is strictly coarser than $\\tau.$ Examples of locally minimal groups are all subgroups of Banach-Lie groups, all locally compact groups and all minimal groups. Motivated by the fact that locally compact NSS groups are Lie groups, we study the connection between local minimality and the NSS property, establishing that under certain conditions, locally minimal NSS groups are metrizable. A symmetric subset of an abelian group containing zero is said to be a GTG set if it generates a group topology in an analogous way as convex and symmetric subsets are unit balls for pseudonorms on a vector space. We consider topological groups which have a neighborhood basis at zero consisting of GTG sets. Examples of these locally GTG groups are: locally pseudo--convex spaces, groups uniformly free from small subgroups (...

  20. Effect of protease inhibitor MG132 on cancer cachexia%蛋白酶体抑制剂MG132对肿瘤恶病质的改善作用

    张刘平; 陈志雄; 安昌勇; 寇耀; 唐华; 汤为学


    Objective To study the role of different MG132 doses in prevention and treatment of cancer cachexia. Methods A mouse cancer cachexia model was induced by inoculating mouse colon cancer 26 cells into male BALB/c mice. Eighty-eight male BALB/c mice were divided into healthy control (HC) group (re =8) , cancer cachexia (CC) group (re = 16) , low concentration MG132 prevention (PL) group (re =8) , moderate MG132 concentration prevention ( PM) group (re = 16) and high MG132 concentration prevention (PH) group (re =8) , low MG132 concentration treatment (TL) group (n =8) , moderate MG132 concentration treatment (TM) group (n =16) and high MG132 concentration treatment ( TH) group (re =8). Their BMI, diet intake and tumor volume were measured daily. Mice in prevention groups and treatment groups were intraperitoneally injected with MG132 (0.01, 0. 1 and 0.5 mg/kg) on days 5 and 12 after inoculation of colon cancer 26 cells. Eight mice in each group were killed on day 19 after inoculation of colon cancer 26 cells and their tumor, left gastrocnemius muscle and epididymis adipose tissue were weighed. Serum levels of glucose (Glu) , triglyceride (TG) , total protein (TP) and albumin (ALB) were measured. The remaining 8 mice in CC group, PM group and TM group received the original treatment till their death and their survival time was recorded. Results The spontaneous activity and non-tumor BMI, the weight of cross-cut gastrocnemius muscle fiber, gastrocnemius muscle and epididymis adipose, and the serum Glu and ALB levels were significantly higher and the survival time was longer whereas the serum TG level was significantly lower in MG132 prevention and treatment groups than in CC group (P <0. 05). The best effect of MG132 on cancer cachexia was observed in PM and TM groups (P <0. 05) . The tumor growth was significantly inhibited in PH group (P <0. 05) . Conclusion MG132 at a moderate dose can rather effectively prevent and improve cancer cachexia, and prolong the survival

  1. Higher arithmetic Chow groups

    Gil, J I Burgos


    We give a new construction of higher arithmetic Chow groups for quasi-projective arithmetic varieties over a field. Our definition agrees with the higher arithmetic Chow groups defined by Goncharov for projective arithmetic varieties over a field. These groups are the analogue, in the Arakelov context, of the higher algebraic Chow groups defined by Bloch. The degree zero group agrees with the arithmetic Chow groups of Burgos. Our new construction is shown to be a contravariant functor and is endowed with a product structure, which is commutative and associative.

  2. Single shot spinal anaesthesia with hypobaric bupivacaine for hip fracture repair surgery in the elderly. Randomized, double blinded comparison of 3.75 mg vs. 7.5 mg.

    Errando, C L; Soriano-Bru, J L; Peiró, C M; Ubeda, J


    Arterial hypotension is the most frequent adverse effect of subarachnoid anaesthesia in the elderly sustaining a femoral proximal fracture. Decreasing the local anaesthetic dose reduces the incidence of hypotension but shortens sensory block duration that could be insufficient in some surgical procedures. Sensory block duration could be prolonged using hypobaric local anaesthetics. We evaluated whether low hypobaric bupivacaine doses were adequate for this type of surgery while maintaining the haemodynamic stability. A prospective, randomized, double blinded study was designed. Patients over 65 years old, sustaining traumatic hip fracture, were assigned to one of two groups: B0.5 group, hypobaric bupivacaine 7.5mg 5mg/ml (control group), and B0.25 group, hypobaric bupivacaine 3.75 mg 2.5mg/ml (study group). After subarachnoid injection, sensory level and motor blockade degree were registered, as were blood pressure, and heart rate at basal time and at 2, 5, 10, 15, 20 and 30 min after injection. The doses of vasopressor needed were registered as well. Surgical conditions and the duration of the surgical procedure-whether rescue analgesia or anaesthesia was needed-and sensory level regression to T12, were registered as well. Sixty four patients was the calculated sample size. The study was stopped in an interim analysis because an elevated number of patients in the B0.25 group needed iv rescue anaesthesia. In the analyzed cases, blood pressure was significantly lower in the B0.5 group at the 15 and 30 min measurements. Vasopressor drugs needs were similar between groups [ephedrine accumulated mean (SD) doses 11.4 (5.2) mg vs. 9.1 (2.7) mg, p=0.045)]. Sensory block regression to T12 was faster in the B0.25 group, [(mean (SD) 68.2 (29.0) min vs. 112.8 (17.3) min in the B0.5 group, p<0.05]. Five out of 19 patients in the B0.25 group needed intravenous anaesthesia rescue before surgery started. Lowering hypobaric bupivacaine dose to 3.75 mg in subarachnoid anaesthesia

  3. An Evaluation of Theraphy with Fluconazole 150 mg Tablets Compared to Fluconazole 150 mg Tablets Plus Dermoxen Lenitiva Cream in The Time to Reduce Simptomatology in Women with Vulvovaginal Candidiasis

    Davide Carati


    Full Text Available Aim of the study. Authors investigated first of all the time to onset of first relief of symptoms. Secondary measures included the time to overall relief of symptoms and the reoccurrence rate over the first 45 days after the first visit. Methods. A randomized, open-label, parallel study evaluated 47 women with moderate to severe symptoms of Vulvo Vaginal Candidiasis (VVC. Patients were divided into two groups of treatment: group 1 followed a therapy with Fluconazole 150 mg tablets, while group 2 had a therapy based on Fluconazole 150 mg tablets coadjuvated by Dermoxen Lenitiva cream. Results. The time at which 50% of patients experienced first relief of symptoms was 24.6 hours for Group 1, while for Group 2 it was 12.4 hours (P<0.05. There were significant differences between the two groups in respect to the time of first relief of symptoms and reoccurrence of infection within 45 days of treatment. Conclusions. Combined treatment with Fluconazole 150 mg tablets and by Dermoxen Lenitiva cream provides statistically significant improvement in the time of first relief of symptoms, complete relief of symptoms and relapse time in the treatment of VVC compared to fluconazole 150 mg tablets only.

  4. Low temperature phase transition and crystal structure of CsMgPO4

    Orlova, Maria; Khainakov, Sergey; Michailov, Dmitriy; Perfler, Lukas; Langes, Christoph; Kahlenberg, Volker; Orlova, Albina


    CsMgPO4 doped with radioisotopes is a promising compound for usage as a radioactive medical source. However, a low temperature phase transition at temperatures close to ambient conditions (~-40 °C) was observed. Information about such kind of structural changes is important in order to understand whether it can cause any problem for medical use of this compound. The phase transition has been investigated in detail using synchrotron powder diffraction, Raman spectroscopy and DFT calculations. The structure undergoes a transformation from an orthorhombic modification, space group Pnma (RT phase) to a monoclinic polymorph, space group P21/n (LT phase). New LT modification adopts similar to RT but slightly distorted unit cell: a=9.58199(2) Å, b=8.95501(1) Å, c=5.50344(2) Å, β=90.68583(1)°, V=472.198(3) Å3. CsMgPO4 belongs to the group of framework compounds and is made up of strictly alternating MgO4- and PO4-tetrahedra sharing vertices. The cesium counter cations are located in the resulting channel-like cavities. Upon the transformation a combined tilting of the tetrahedra is observed. A comparison with other phase transitions in ABW-type framework compounds is given.

  5. Preparation of a sample with a single MgH2 phase by horizontal ball milling and the first hydriding reaction of 90 wt% Mg-10 wt% MgH2

    Hong, Seong-Hyeon; Song, Myoung Youp


    In order to prepare an additive-free sample with a single MgH2 phase, 90 wt% Mg-10 wt% MgH2 (named 90Mg-10MgH2) was milled under a hydrogen atmosphere in a horizontal ball mill, and then hydrided. The hydrogen absorption and desorption properties of the prepared samples were investigated, and compared with those of milled pure Mg and purchased MgH2. X-ray diffraction analysis, measurement of specific BET surface areas, and observation of the prepared samples by scanning electron microscope were performed. The 90Mg-10MgH2 sample after hydriding-dehydriding cycling had small and large particles with fine particles on their surfaces, and had much finer particles and more defects than the milled pure Mg sample after hydridingdehydriding cycling. The specific BET surface areas of the milled Mg and 90Mg-10MgH2 were measured as 7.81 and 99.81 m2/g, respectively. A sample that had almost a single MgH2 phase could be prepared by horizontal ball milling and the first hydriding reaction of 90Mg-10MgH2. 90Mg-10MgH2 released 5.82 wt% H for about 70 min, while unmilled MgH2 (Aldrich) released 6.04 wt% H for about 100 min, at 648 K.

  6. Elastic and inelastic scattering of 0. 8 GeV polarized protons from /sup 24/Mg and /sup 26/Mg

    Blanpied, G.S.; Ritchie, B.G.; Barlett, M.L.; Hoffmann, G.W.; McGill, J.A.; Milner, E.C.; Jones, K.W.; Nanda, S.K.; de Swiniarski, R.


    Data on 800 MeV polarized proton scattering on /sup 24/Mg and /sup 26/Mg are presented. Angular distributions and analyzing power data have been extracted from fits to 26 peaks in the spectra for /sup 24/Mg and 23 peaks in /sup 26/Mg. Although there are a variety of shapes for the angular distributions, the analyzing power data for all states are positive and similar in magnitude and seem to be consistent with a two-body operator for the excitation with a spin structure much like that for the free proton-nucleon system. Evidence for a level in /sup 26/Mg at 8.03 MeV with J>4 is presented. Comparison between the observed angular distribution, coupled channels, and distorted wave Born approximation calculations, and the angular distributions of excited states in neighboring nuclei, support the assignment of J/sup ..pi../ = 5/sup -/ or 6/sup +/. Coupled channels calculations for the 0/sup +/, 2/sup +/, 4/sup +/, and 6/sup +/ members of the ground state rotational bands of /sup 24/Mg and /sup 26/Mg are compared to the data. Deformation parameters from distorted wave Born approximation calculations are determined for most of the angular distributions.

  7. Effect of Mg on microstructures and properties of Al-Mg-Si-Cu aluminium alloys for automotive body sheets

    LIU Hong; SONG Wen-ju; ZHAO Gang; LIU Chun-ming; ZUO Liang


    The effects of variation of Mg content on microstructures,the tensile properties and the formability of Al-Mg-Si-Cu alloys for automotive body sheets were investigated by means of scan electron microscopy,optical metallographic analysis,tensile and Ericsson tests.The results show that for Al-Mg-Si-Cu aluminium alloys with excessive Si,with an increment of Mg content,the strength enhances,the specific elongation and Erisson values of alloys decrease,and the number of Mg2 Si constituent increases and that of Al(MnFe)Si type constituents reduces.Al-MgSi-Cu aluminium alloys with excessive Si for automotive body sheets can present obviously the paint bake hardenability during the paint bake cycle (I.e.artificial aging at 170 ℃ for 30 min immediately after the solution treatment and quenching).Suitable Mg content should be controlled in the range of 0.8% and 1.2 % (mass fraction).

  8. As-cast microstructure of Al-Zn-Mg and Al-Zn-Mg-Cu alloys added erbium

    MAO Jian-wei; JIN Tou-nan; XU Guo-fu; NIE Zuo-ren


    The effects of different contents of rare earth element, and erbium, on the as-cast microstructures of Al-6Zn-2Mg and Al-6Zn-2Mg-1.8Cu alloys were studied by optical microscopy, scanning electron microscopy, X-ray diffractometry, transmission electron microscopy and EDS analysis. The results show that the netlike structure of as-cast alloys can be remarkably refined, and the distance of dendritic structure decreases, with Er addition. However, the improvement results on Al-Zn-Mg-Cu are not better than that of Al-Zn-Mg. Er and Al can interact to form Al3Er phase, which is coherent with α(Al) matrix, with trace Er addition to the Al-Zn-Mg alloy. The refinement effect of Al-Zn-Mg alloys is familiar with the formation and precipitation of coherent Al3Er phases. The ternary compound AlCuEr, similar with AlCuSc phase, will form when Er is added to Al-Zn-Mg-Cu alloy, which suppresses the formation of Al3Er phase and doesn't solve in the following heat treatment.

  9. Basolateral Mg2+ extrusion via CNNM4 mediates transcellular Mg2+ transport across epithelia: a mouse model.

    Daisuke Yamazaki

    Full Text Available Transcellular Mg(2+ transport across epithelia, involving both apical entry and basolateral extrusion, is essential for magnesium homeostasis, but molecules involved in basolateral extrusion have not yet been identified. Here, we show that CNNM4 is the basolaterally located Mg(2+ extrusion molecule. CNNM4 is strongly expressed in intestinal epithelia and localizes to their basolateral membrane. CNNM4-knockout mice showed hypomagnesemia due to the intestinal malabsorption of magnesium, suggesting its role in Mg(2+ extrusion to the inner parts of body. Imaging analyses revealed that CNNM4 can extrude Mg(2+ by exchanging intracellular Mg(2+ with extracellular Na(+. Furthermore, CNNM4 mutations cause Jalili syndrome, characterized by recessive amelogenesis imperfecta with cone-rod dystrophy. CNNM4-knockout mice showed defective amelogenesis, and CNNM4 again localizes to the basolateral membrane of ameloblasts, the enamel-forming epithelial cells. Missense point mutations associated with the disease abolish the Mg(2+ extrusion activity. These results demonstrate the crucial importance of Mg(2+ extrusion by CNNM4 in organismal and topical regulation of magnesium.

  10. Bending strain tolerance of MgB2 superconducting wires

    Kováč, P.; Hušek, I.; Melišek, T.; Kulich, M.; Kopera, L.


    This work describes the strain tolerance of MgB2 superconductors subjected to variable bending stresses. Bending of MgB2 wire was done at room temperature in different modes: (i) direct bending of straight annealed samples to variable diameters and by (ii) indirect bending by straightening of bent and annealed samples. I c-bending strain characteristics of samples made by in situ PIT and by the internal magnesium diffusion (IMD) process were measured at 4.2 K. The results show a good agreement between the direct and indirect bending mode, which allows easier estimation of limits important for the winding process of MgB2 superconductors with brittle filaments. A comparison of MgB2 wires made by in situ PIT and IMD processes showed improved strain tolerance for IMD due to better grain connectivity the low annealing temperature, which does not appear to reduce the mechanical strength of sheath material.


    mine, have a nearly ideal "picrotephroite" composition which is halfway between ... The iron and manganese ores, which are in proximity with each other but well .... From the chemical analysis of the studied Mn-Mg olivines, the numbers of.

  12. $^{31}$Mg $\\beta$-NMR applied in chemistry and biochemistry

    Magnesium ions, Mg$^{2+}$, are essential in biological systems, taking part in practically all phosphate chemistry, in photosynthesis as an integral component of chlorophyll, and they are regulated via transport through selective membrane proteins. Nonetheless, the function of magnesium ions in biochemistry is difficult to characterize, as it is practically invisible to current experimental techniques. With this proposal we aim to advance the use of $^{31}$Mg $\\beta$-NMR to liquid samples, building on the experience from the successful Letter of Intent INTC-I-088 “$\\beta$-NMR as a novel technique for biological applications”. Initially a series of experiments will be conducted aiming to characterize the coordination chemistry of Mg$^{2+}$ in ionic liquids (ILs), demonstrating that it is possible within the lifetime of the radioisotope to achieve binding of Mg$^{2+}$ to a molecule dissolved in the IL. ILs are chosen as they display a very low vapor pressure, and are thus straightforwardly compatible with t...

  13. Interpreting the Mg IIh andk Line Profiles of Mira Variables

    Wood, B. E.; Karovska, M.


    We use radiative transfer calculations to reproduce the basic appearance of Mg II lines observed from Mira variables. These lines have centroids that are blueshifted by at least 30 km s-1 from the stellar rest frame. It is unlikely that flow velocities in the stellar atmospheres are this fast, so radiative transfer effects must be responsible for this behavior. Published hydrodynamic models predict the existence of cool, downflowing material above the shocked material responsible for the Mg II emission, and we demonstrate that scattering in this layer can result in Mg II profiles as highly blueshifted as those that are observed. However, our models also show that scattering within the shock plays an equally strong role in shaping the Mg II profiles, and our calculations illustrate the importance of partial redistribution and the effects of being out of ionization equilibrium.

  14. Attempts at doping indium in MgB2

    Grivel, J.-C.


    Indium (In) doped MgB2 polycrystalline samples were prepared by solid-liquid phase reaction in Ar. After reaction at 800 °C, less than 1 at.% Mg was replaced by In in the MgB2 phase, without significant influence on its lattice parameters and only a slight decrease of its superconducting transition temperature. For all studied In concentrations in the nominal composition, the formation of InMg was evidenced by X-ray diffraction. The critical current density and accommodation field of the wires are decreased in the samples containing In. The flux pinning mechanism can be described by surface pinning in both the doped and undoped samples.

  15. Facile fabrication of hydrophobic surfaces on mechanically alloyed-Mg/HA/TiO{sub 2}/MgO bionanocomposites

    Khalajabadi, Shahrouz Zamani [Medical Devices and Technology Group (MEDITEG), Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor (Malaysia); Abdul Kadir, Mohammed Rafiq, E-mail: [Medical Devices and Technology Group (MEDITEG), Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor (Malaysia); Izman, Sudin; Mohd Yusop, Mohd Zamri [Department of Materials, Manufacturing and Industrial Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor (Malaysia)


    Highlights: • Mg/HA/TiO{sub 2}-based nanocomposite was produced using mechanical alloying. • The hydrophobic surface coverage was fabricated on the mechanical alloyed samples by annealing. • The morphological characteristics, phase evolution and wettability of nanocomposites and the hydrophobic surface coverage were investigated. • The activation energies and reaction kinetic of the powder mixture of nanocomposites were calculated. - Abstract: The effect of mechanical alloying and post-annealing on the phase evolution, microstructure, wettability and thermal stability of Mg–HA–TiO{sub 2}–MgO composites was investigated in this study. Phase evolution and microstructure analysis were performed using X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy and atomic force microscopy, as well as the wettability determined by contact angle measurements with SBF. The 16-h mechanical alloying resulted in the formation of MgTiO{sub 3}, CaTiO{sub 3}, Mg{sub 3}(PO{sub 4}){sub 2} and Mg(OH){sub 2} phases and a decrease in wettability of the nanocomposites. A hydrophobic film with hierarchical structures comprising nanoflakes of MgTiO{sub 3}, nano-cuboids of CaTiO{sub 3}, microspheres of Mg{sub 3}(PO{sub 4}){sub 2} and Mg(OH){sub 2} was successfully constructed on the surface of the Mg-based nanocomposites substrates as a result of the post-annealing process. After 1-h annealing at 630 °C, the synthesized hydrophobic surface on the nanocomposite substrates decreased the wettability, as the 8-h-mechanically alloyed samples exhibited a contact angle close to 93°. The formation activation energies and reaction kinetics of the powder mixture were investigated using differential thermal analysis and thermal gravimetric analysis. The released heat, weight loss percentage and reaction kinetics increased, while the formation activation energies of the exothermic reactions decreased following an increase in the milling time.

  16. On Interpreting the Photoelectron Spectra of MgO

    Bauschlicher, Charles W., Jr.; Partridge, Harry; Arnold, James (Technical Monitor)


    The (sup 2)Sigma(+) and (sup 2)Pi states of MgO(-) and the (sup 1)Sigma(+), (sup 1)Pi, and (sup 3)Pi states of MgO are studied using the averaged coupled-pair functional (ACPF) approach. The computed spectroscopic constants are in good agreement with the available experimental data. The computed Franck-Condon factors and photodetachment overlaps are compared with experiment.

  17. Photoionization of excited states of neon-like Mg III

    Narendra Singh; Man Mohan


    The close coupling -matrix method is used to calculate cross-sections for photoionization of Mg III from its first three excited states. Configuration interaction wave functions are used to represent two target states of Mg III retained in the -matrix expansion. The positions and effective quantum numbers for the Rydberg series converging to the excited state 2226 \\ 2 of the residual ion, are predicted.

  18. Preparation and characterization of MgB2 superconductor

    Shashwati Sen; D K Aswal; Ajay Singh; T V Chandrasekhar Rao; K P Muthe; J C Vyas; L C Gupta; S K Gupta; V C Sahni


    The MgB2 superconductor, synthesized using solid-state and liquid-phase sintering methods, have been characterized for various properties. The upper critical field, irreversibility line and critical current density have been determined using magnetization data. The current–voltage characteristics recorded under an applied magnetic field revealed the existence of vortex glass transition. The surface analysis using X-ray photoelectron spectroscopy shows that MgB2 is sensitive to atmospheric degradation.

  19. TEM microstructure of mechanically alloyed Ti-12Mg powders

    T. S. KIM; B. T. LEE; J. P. AHN; J. K. PARK; J. C. BAE


    The microstructures of mechanical alloyed(MA) Ti-12%Mg alloy powders were examined using a high resolution TEM (HRTEM). The effect of MA atmospheres such as argon gas and liquid isopropyl alcohol on the resultant microstructure was investigated. Both the MA powders form a homogeneous Ti-Mg solid solution, but the oxidation behavior is distinguished. The phase change was studied as a function of milling conditions and annealing temperatures.

  20. Structures and stabilities of (MgO)n nanoclusters.

    Chen, Mingyang; Felmy, Andrew R; Dixon, David A


    Global minima for (MgO)n structures were optimized using a tree growth-hybrid genetic algorithm in conjunction with MNDO/MNDO/d semiempirical molecular orbital calculations followed by density functional theory geometry optimizations with the B3LYP functional. New lowest energy isomers were found for a number of (MgO)n clusters. The most stable isomers for (MgO)n (n > 3) are 3-dimensional. For n < 20, hexagonal tubular (MgO)n structures are more favored in energy than the cubic structures. The cubic structures and their variations dominate after n = 20. For the cubic isomers, increasing the size of the cluster in any dimension improves the stability. The effectiveness of increasing the size of the cluster in a specific dimension to improve stability diminishes as the size in that dimension increases. For cubic structures of the same size, the most compact cubic structure is expected to be the more stable cubic structure. The average Mg-O bond distance and coordination number both increase as n increases. The calculated average Mg-O bond distance is 2.055 Å at n = 40, slightly smaller than the bulk value of 2.104 Å. The average coordination number is predicted to be 4.6 for the lowest energy (MgO)40 as compared to the bulk value of 6. As n increases, the normalized clustering energy ΔE(n) for the (MgO)n increases and the slope of the ΔE(n) vs n curve decreases. The value of ΔE(40) is predicted to be 150 kcal/mol, as compared to the bulk value ΔE(∞) = 176 kcal/mol. The electronic properties of the clusters are presented and the reactive sites are predicted to be at the corners.