520 research outputs found
Performance and Reliability of Integrated Solar Thermal Electronics and Devices
The performance and reliability of solar thermal electrical device is studied. A
3-Uniform states and orthogonal arrays
In a recent paper (Phys. Rev. A 90, 022316 (2014) ), Goyeneche et al.
established a link between the combinatorial notion of orthogonal arrays and
k-uniform states and present open issue. (B) Find for what N there are
3-uniform states of N-qubits. In this paper, we demonstrate the existence of
3-uniform states of N-qubits for N=11,..,15"
Low-Cost QCM Sensor System for Screening Semen Samples
Artificial insemination is a well-established part of modern agricultural practice. A viable semen sample is judged by the total number of spermatozoa (sperm) in the sample and the motility of the sperm. In this paper, we report the development of a reusable measurement cell and electronics for screening semen samples based on the Quartz Crystal Microbalance (QCM) and Universal Frequency to Digital Converter (UFDC-1) to produce a low-cost sensor system. After introducing the semen sample at one end of the measurement cell, sperm swim down a channel before causing a frequency change on the QCM. Data is presented that shows the different frequency changes using a commercial frequency counter caused by porcine semen samples, one two days old and one twenty one days old. Similar data is presented for a motile semen sample measurement using the low-cost UFDC-1
Low-Cost QCM Sensor System for Screening Semen Samples
Artificial insemination is a well-established part of modern agricultural practice. A viable semen sample is judged by the total number of spermatozoa (sperm) in the sample and the motility of the sperm. In this paper, we report the development of a reusable measurement cell and electronics for screening semen samples based on the Quartz Crystal Microbalance (QCM) and Universal Frequency to Digital Converter (UFDC-1) to produce a low-cost sensor system. After introducing the semen sample at one end of the measurement cell, sperm swim down a channel before causing a frequency change on the QCM. Data is presented that shows the different frequency changes using a commercial frequency counter caused by porcine semen samples, one two days old and one twenty one days old. Similar data is presented for a motile semen sample measurement using the low-cost UFDC-1
Electrical properties of individual tin oxide nanowires contacted to platinum electrodes
A simple and useful experimental alternative to field-effect transistors for measuring electrical properties
free electron concentration nd, electrical mobility , and conductivity in individual nanowires has been
developed. A combined model involving thermionic emission and tunneling through interface states is proposed
to describe the electrical conduction through the platinum-nanowire contacts, fabricated by focused ion
beam techniques. Current-voltage I-V plots of single nanowires measured in both two- and four-probe
configurations revealed high contact resistances and rectifying characteristics. The observed electrical behavior
was modeled using an equivalent circuit constituted by a resistance placed between two back-to-back Schottky
barriers, arising from the metal-semiconductor-metal M-S-M junctions. Temperature-dependent I-V measurements
revealed effective Schottky barrier heights up to BE= 0.4 eV
Kondo effect in a one-electron double quantum dot: Oscillations of the Kondo current in a weak magnetic field
We present transport measurements of the Kondo effect in a double quantum dot
charged with only one or two electrons, respectively. For the one electron case
we observe a surprising quasi-periodic oscillation of the Kondo conductance as
a function of a small perpendicular magnetic field |B| \lesssim 50mT. We
discuss possible explanations of this effect and interpret it by means of a
fine tuning of the energy mismatch of the single dot levels of the two quantum
dots. The observed degree of control implies important consequences for
applications in quantum information processing
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