31,213 research outputs found
Numerical modeling of modified Newtonian dynamics in galaxies : testing the external field effects
No full textGalaxies are natural laboratories for testing fundamental physics on the nature of the dark matter. MOdified Newtonian Dynamics (MOND) has been tested for over 20 years on small and large scales. While there are several versions of how MOND extrapolates to the large scales, and these versions are not yet fully successful, the original Bekenstein-Milgrom version of MOND is fully predictive and works very well on galaxy scales. However, little work has been done to explore this theory beyond fitting the rotation curves and Tully-Fisher relation of isolated disc galaxies. So far little is known of MONDian elliptical galaxies accelerating in any galaxy cluster.
A defining feature of MOND is that internal dynamics of the galaxy depends on the overall acceleration of the galaxy. The existence of cuspy triaxial equilibria for elliptical galaxies is the minimal requirement to MOND. With the PhD project here, I constructed and then further studied the evolution and stability of gravitationally bound systems resembling like cuspy elliptical galaxies, both in isolation and when embedded in a uniform external field. I also studied the escape speeds from spiral galaxies, in particular by comparing the potentials of the Milky Way Galaxy in the Cold Dark Matter (CDM) and MOND frameworks
Ph. Schmalz, Architekt, Baugeschäft, Frankfurt a/M., Heinestr. 17, FI 3642, Neubauten, Umbauten, Baugesuche, Gutachten
No full textPH. SCHMALZ, ARCHITEKT, BAUGESCHÄFT, FRANKFURT A/M., HEINESTR. 17, FI 3642, NEUBAUTEN, UMBAUTEN, BAUGESUCHE, GUTACHTEN
Ph. Schmalz, Architekt, Baugeschäft, Frankfurt a/M., Heinestr. 17, FI 3642, Neubauten, Umbauten, Baugesuche, Gutachten ( -
Photonic porous silicon as a pH sensor
Full text linkChronic wounds do not heal within 3 months, and during the lengthy healing process, the wound is invariably exposed to bacteria, which can colonize the wound bed and form biofilms. This alters the wound metabolism and brings about a change of pH. In this work, porous silicon photonic films were coated with the pH-responsive polymer poly(2-diethylaminoethyl acrylate). We demonstrated that the pH-responsive polymer deposited on the surface of the photonic film acts as a barrier to prevent water from penetrating inside the porous matrix at neutral pH. Moreover, the device demonstrated optical pH sensing capability visible by the unaided eye
Alle Welt singt ihr Lob, Ph Benj Ribot Schwabach i/B.
No full textALLE WELT SINGT IHR LOB, PH BENJ RIBOT SCHWABACH I/B.
Alle Welt singt ihr Lob, Ph Benj Ribot Schwabach i/B. ( -
An epidemiological investigation of a food-poisoning outbreak in a Taitung county village
No full textRosenthal Porzellan; Dekor Rosenkavalier, Form Donatello; Porzellanfarik Ph. Rosenthal & Co. A.G. Selb i. Bayern
No full textROSENTHAL PORZELLAN; DEKOR ROSENKAVALIER, FORM DONATELLO; PORZELLANFARIK PH. ROSENTHAL & CO. A.G. SELB I. BAYERN
Rosenthal Porzellan; Dekor Rosenkavalier, Form Donatello; Porzellanfarik Ph. Rosenthal & Co. A.G. Selb i. Bayern ( -
pH dependence of quinone-mediated extracellular electron transfer in a bioelectrochemical system
No full textQuinone-mediated extracellular electron transfer (EET) is a well-known and important microbial respiration process in many natural and engineering systems. While it has been recognized that both the speciation of quinones and cell metabolism are pH-sensitive, the pH dependence of quinone-mediated EET is still unclear. In this study, pH effects in the range of 6.2 to 7.8 were investigated in a bioelectrochemical system using 9,10-anthraquinone-2-sulfonic acid (AQS) as a model quinone. The results showed that the current generation increased at pH 6.2-6.8 and then tended to stabilize, with a slight decrease at pH 7.0-7.8. The open circuit voltage (OCV) changed in a similar manner as a function of pH. The cell growth after current generation at different pH values was also indicated by the total DNA, which increased at pH 6.2-6.8 and then decreased at pH 7.0-7.8. Thermodynamic calculations and cyclic voltammetry measurements indicated that the redox potentials of AQS were negatively correlated with pH. At pH 6.2-7.0, both cell growth and the AQS redox properties had positive effects; at pH 7.0-7.8, while the AQS redox properties still had a positive impact on the EET capacity, the decline in the cell density slowed the increase of the EET capacity. These results provide a fundamental understanding of quinone-mediated EET processes and emphasize the importance of pH. (C) 2016 Elsevier Ltd. All rights reserved
Concept and development of an autonomous wearable micro-fluidic platform for real time pH sweat analysis
Full text linkIn this work the development of an autonomous, robust and wearable micro-fluidic platform capable of performing on-line analysis of pH in sweat is discussed. Through the means of an optical detection system based on a surface mount light emitting diode (SMD LED) and a light photo sensor as a detector, a wearable system was achieved in which real-time monitoring of sweat pH was performed during 55 minutes of cycling activity. We have shown how through systems engineering, integrating miniaturised electrical components, and by improving the micro-fluidic chip characteristics, the wearability, reliability and performance of the micro-fluidic platform was significantly improved
Early diagnosis and successful treatment of acute antibody-mediated rejection of a renal transplant.
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