568 research outputs found
Salmon River Road Construction
No full textAn explosion in the Salmon River Canyon on the Salmon River road project. Description reads: ""Shooting rock points on Salmon River road above French Creek. A CCC job. Forest: Nez Perce, State: Idaho, Date: 7/1935, Author: K.D. Swan""
Creating a modern educational environment: a view through the prism of the ideas of K.D. Ushinskyi
No full textАвтор розглядає створення сучасного освітнього середовища крізь призму ідей К.Д. Ушинського.The author examines the creation of a modern educational environment through the prism of the ideas of K.D. Ushinskyi
Fall Roundup
No full textA field full of cattle is framed by a meandering creek in the foreground and a range of hills in the background. A few coyboys and their dogs can be seen on the edges of the herd of cows. Description reads: ""The fall roundup in Bear Valley. Forest: Sawtooth N.F., State: Idaho, Date: 9-24-35, Author: K.D. Swan""
Inter institutional workshop on breakwaters
No full text(1) Functional requirements for Breakwaters - Prof. K.d' Angremond (2) Development of fishery harbors in India - Mr. K. Omprakash (3) Non-rubble Breakwaters and optimisation - Prof. K.d' Angremond (4) Wave energy caisson Breakwaters - Dr. S. Neelamani (5) Partially suspended porous wall Breakwaters - Dr. J.S. Mani (6) Case studies on stability of Breakwaters - Prof. V. Sundar (7) Introduction on Ennore coal port project - Mr. L.A. Mayboom (8) Design of Breakwaters for Ennore port - Mr. R. Haggie (9) Construction of Breakwaters for Ennore port - Mr. S. PearsonHydraulic EngineeringCivil Engineering and Geoscience
On-demand generation of background-free single photons from a solid-state source
No full textTrue on-demand high-repetition-rate single-photon sources are highly sought after for quantum information processing applications. However, any coherently driven two-level quantum system suffers from a finite re-excitation probability under pulsed excitation, causing undesirable multi-photon emission. Here, we present a solid-state source of on-demand single photons yielding a raw second-order coherence of g(2)(0)=(7.5±1.6)×10-5 without any background subtraction or data processing. To this date, this is the lowest value of g(2)(0) reported for any single-photon source even compared to the previously reported best background subtracted values. We achieve this result on GaAs/AlGaAs quantum dots embedded in a low-Q planar cavity by employing (i) a two-photon excitation process and (ii) a filtering and detection setup featuring two superconducting single-photon detectors with ultralow dark-count rates of (0.0056±0.0007) s-1 and (0.017±0.001) s-1, respectively. Re-excitation processes are dramatically suppressed by (i), while (ii) removes false coincidences resulting in a negligibly low noise floor.QN/Zwiller La
A voltage contrast detector with double channel energy analyser in a scanning electron microscope
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