Altering level shifts and spontaneous decay rates of distant atoms \\ using partially-transparent asymmetric mirror interfaces

In three dimensions, dipole-dipole interactions which alter atomic level shifts and spontaneous decay rates only persist over distances comparable to the wavelength of the emitted light. To provide novel tools for quantum technology applications, like quantum sensing, many attempts have been made to extend the range of these interactions. In this paper we show that this can be achieved with the help of partially-transparent asymmetric interfaces {\em without} involving negative index metamaterials. Suppose two atoms are placed on opposite sides of the interface, each at the position of the mirror image of the other. In this case, their emitted light interferes exactly as it would when the atoms are right next to each~other. Hence their dipole-dipole interaction assumes an additional maximum, even when the actual distance of the atoms is several orders of magnitude larger than their transition wavelength.Comment: 12 pages, 4 figure

Canadian Network for Mood and Anxiety Treatments (CANMAT) and International Society for Bipolar Disorders (ISBD) 2018 guidelines for the management of patients with bipolar disorder

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/142934/1/bdi12609.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/142934/2/bdi12609_am.pd

Efficiency of primary saliva secretion: an analysis of parameter dependence in dynamic single-cell and acinus models, with application to aquaporin knockout studies

Secretion from the salivary glands is driven by osmosis following the establishment of osmotic gradients between the lumen, the cell and the interstitium by active ion transport. We consider a dynamic model of osmotically driven primary saliva secretion and use singular perturbation approaches and scaling assumptions to reduce the model. Our analysis shows that isosmotic secretion is the most efficient secretion regime and that this holds for single isolated cells and for multiple cells assembled into an acinus. For typical parameter variations, we rule out any significant synergistic effect on total water secretion of an acinar arrangement of cells about a single shared lumen. Conditions for the attainment of isosmotic secretion are considered, and we derive an expression for how the concentration gradient between the interstitium and the lumen scales with water- and chloride-transport parameters. Aquaporin knockout studies are interpreted in the context of our analysis and further investigated using simulations of transport efficiency with different membrane water permeabilities. We conclude that recent claims that aquaporin knockout studies can be interpreted as evidence against a simple osmotic mechanism are not supported by our work. Many of the results that we obtain are independent of specific transporter details, and our analysis can be easily extended to apply to models that use other proposed ionic mechanisms of saliva secretion

Location aware system using Bluetooth low energy

Location aware system have been available to the outdoor scenarios for various different uses such as GPS (Global Positioning System) navigation and finding restaurants nearby. However, that is not true for indoor scenarios as GPS and Assisted GPS (A-GPS) technology used for outdoors simply doesn’t work for indoor scenarios. Therefore, Location Aware System using Bluetooth Low Energy (BLE) is a project set out to research and explore the use BLE for a location aware system for indoor use. The system set-up includes Bluetooth BLE broadcasters and a mobile application to explore the possibility of creating an “indoor GPS”. Several BLE broadcasters have been set-up to broadcast advertisement messages. The mobile application is then programmed to pick up the messages broadcasted by the BLE broadcasters and to make use of the information in the messages to track and locate the user of the mobile application. The results from this project have shown that the system is promising and could potentially be implemented in the future.Bachelor of Engineering (Computer Science

SON68 glass dissolution driven by magnesium silicate precipitation

International audienc

Long-term alteration of basaltic glass: Mechanisms and rates

International audienc

Remote Non-Invasive Fabry-Pérot Cavity Spectroscopy for Label-Free Sensing

One way of optically monitoring molecule concentrations is to utilise the high sensitivity of the transmission and reflection rates of Fabry-Pérot cavities to changes of their optical properties. Up to now, intrinsic and extrinsic Fabry-Pérot cavity sensors have been considered with analytes either being placed inside the resonator or coupled to evanescent fields on the outside. Here we demonstrate that Fabry-Pérot cavities can also be used to monitor molecule concentrations non-invasively and remotely, since the reflection of light from the target molecules back into the Fabry-Pérot cavity adds upwards peaks to the minima of its overall reflection rate. Detecting the amplitude of these peaks reveals information about molecule concentrations. By using an array of optical cavities, a wide range of frequencies can be probed at once and a unique optical fingerprint can be obtained

A comparative study of the dissolution mechanisms of amorphous and crystalline feldspars at acidic pH conditions

International audienceAbstract The dissolution of amorphous and crystalline oligoclase, a Na-feldspar with traces of Ca and K, was investigated at 90 °C and acidic pH of 1.5 and 3 to unravel the impact of long- and short-range orders on silicate dissolution mechanisms. Experiments were conducted in solutions spiked with 29 SiO 2 (aq) and saturated with respect to SiO 2 (am). Through morphology, structural, and composition characterizations, we showed that on the amorphous samples (glass samples), the altered layer was mostly formed by leaching, while a combination of both interfacial precipitation and leaching explains the layers formed on the crystalline sample. As expected, the altered layer was thicker at the most acidic pH and it became passivating on crystalline sample at pH 3. The alteration was faster on amorphous oligoclase than on its crystalline equivalent due to the more open structure of the glass. The preferential release of Al was suggested to play a key role, by weakening the silicate network of both substrates. Finally, in this study, a large overestimation of the global alteration of the materials was noticed based on the solution analyses. Discrepancies with solid analyses were attributed to an underestimation (≥2-fold factor) of the total reactive surface area