Scanning Fourier Spectroscopy: A microwave analog study to image transmission paths in quantum dots

We use a microwave cavity to investigate the influence of a movable absorbing center on the wave function of an open quantum dot. Our study shows that the absorber acts as a position-selective probe, which may be used to suppress those wave function states that exhibit an enhancement of their probability density near the region where the impurity is located. For an experimental probe of this wave function selection, we develop a technique that we refer to as scanning Fourier spectroscopy, which allows us to identify, and map out, the structure of the classical trajectories that are important for transmission through the cavity.Comment: 4 pages, 5 figure

Tidal Evolution of Close Binary Asteroid Systems

We provide a generalized discussion of tidal evolution to arbitrary order in the expansion of the gravitational potential between two spherical bodies of any mass ratio. To accurately reproduce the tidal evolution of a system at separations less than five times the radius of the larger primary component, the tidal potential due to the presence of a smaller secondary component is expanded in terms of Legendre polynomials to arbitrary order rather than truncated at leading order as is typically done in studies of well-separated system like the Earth and Moon. The equations of tidal evolution including tidal torques, the changes in spin rates of the components, and the change in semimajor axis (orbital separation) are then derived for binary asteroid systems with circular and equatorial mutual orbits. Accounting for higher-order terms in the tidal potential serves to speed up the tidal evolution of the system leading to underestimates in the time rates of change of the spin rates, semimajor axis, and mean motion in the mutual orbit if such corrections are ignored. Special attention is given to the effect of close orbits on the calculation of material properties of the components, in terms of the rigidity and tidal dissipation function, based on the tidal evolution of the system. It is found that accurate determinations of the physical parameters of the system, e.g., densities, sizes, and current separation, are typically more important than accounting for higher-order terms in the potential when calculating material properties. In the scope of the long-term tidal evolution of the semimajor axis and the component spin rates, correcting for close orbits is a small effect, but for an instantaneous rate of change in spin rate, semimajor axis, or mean motion, the close-orbit correction can be on the order of tens of percent.Comment: 40 pages, 2 tables, 8 figure

Effect of Different Carbon Sources on In vitro Shoot Regeneration of Solanum nigrum (Linn) - An Important Antiulcer Medicinal Plant

An efficient in vitro protocol for mass propagation of Solanum nigrum was developed.  In the present study, the effect of various carbon sources, sucrose, glucose, fructose, and maltose was investigated on in vitro shoot regeneration using nodal explants. The frequency, growth and multiplication rate were highly influenced by the type and concentration of carbon sources used.  The highest number of shoots (24.0±0.28) were obtained on MS medium supplemented with 4% fructose, but maximum shoot length (11.0±0.28 cm) was observed on MS medium supplemented with 4% sucrose. The least number of shoots obtained on MS medium supplemented with 1% glucose (3.5±0.50), with a shoot length of (3.4±0.34 cm). Among the different carbon sources used in the present study, fructose at 4% proved to be better choice for multiple shoot regeneration followed by sucrose, maltose and glucose, from nodal explants of Solanum nigrum

Electrochemical impedance spectroscopic investigation on detection of H2S gas using 2D TiO2/rGO nano-composites

In the present work, gas sensor was fabricated using nano-Titanium Dioxide (n-TiO2) and nano-Titanium Dioxide/ Reduced Graphene Oxide composite (n-TiO2/rGO). This H2S (2 ppm) gas sensor was evaluated under different temperatures (Room temperature (27 °C) - 200 °C) and achieved the high response at room temperature. The n-TiO2/rGO-3 sensor is high response (RS=43) due to rGO is covered between n-TiO2 and works like a bridge between the adjoining n-TiO2 particles, these properties to increase the electron transfer and enhance the gas adsorption properties. Also sensor was highly selective towards H2S (2 ppm) compared with various gases (CO, NH3, SO2, and H2)., response and recovery (7 s and 10 s), its long-term stability upto 10 days was studied and it was more stable. The properties of the R1 (grain bulk), R2 (grain boundaries) and Q2 (electrode-sensing film contact) was analyzed by impedance with equivalent circuit. Grain boundaries results was highly changed under H2S gas environment and it was analyzed by equivalent circuit-fitted values

Design of Controller for Bidirectional Non-isolated High Gain Converter in EV Application

An interface between a DC supply and an electric vehicle's drive fed by an inverter is a bidirectional DC-DC converter. In this research, a topology for an electric vehicle based on an induction motor that integrates a high voltage gain bidirectional non-isolated DC/DC converter with a three-phase inverter is proposed. This study compares a bidirectional DC to DC converter inverter system controlled by fuzzy logic (FL), and fractional order proportional integral derivative (FOPID). The suggested converter runs in discontinuous-current mode (DCM), with all switches and diodes switching at zero current. It is possible to operate across a wide duty cycle range while maintaining high output voltage gain, low switching stress, minimal switching losses, and high efficiency. The proposed converter's size and weight are decreased so as to support a wide range of duty cycle operations, maintain lower voltage stress on all devices, ensure equal current sharing among inductors, are simple to control, and require a more compact inductor. The converter also uses a constant input current which offers a choice for various applications. MATLAB Simulink is used to construct, model, and simulate open loop system, closed loop FL and FOPID. The results of these simulations are then reported. The investigations show that FOPID controlled DC-DC converter performed better response

Biomineralization studies in age induced human teeth

Key Engineering Materials361-363 II893-896KEMA

Micro-assembled multi-chamber thermal cycler for low-cost reaction chip thermal multiplexing

10.1016/S0924-4247(02)00384-9Sensors and Actuators, A: Physical1021-2114-121SAAP

A Network Approach to Developing Immuno-Oncology Combinations in Canada

Immune checkpoint inhibitors have revolutionized care for many cancer indications, with considerable effort now being focused on increasing the rate, depth, and duration of patient response. One strategy is to combine immune strategies (for example, CTLA-4 and PD-1/L1–directed agents) to harness additive or synergistic efficacy while minimizing toxicity. Despite encouraging results with such combinations in multiple tumour types, numerous clinical challenges remain, including a lack of biomarkers that reliably predict outcome, the emergence of therapeutic resistance, and optimal management of immune-related toxicities. Furthermore, the selection of ideal combinations from the myriad of immune, systemic, and locoregional therapies has yet to be determined. A longitudinal network-based approach could offer advantages in addressing those critical questions, including long-term follow-up of patients beyond individual trials