There is a continuing need for the development of cost-effective and sustainable mid-infrared light sources applications such as gas sensing infrared beacons. A natural replacement conventional incandescent still widely used in semiconductor LEDs, but to achieve emission at long wavelengths requires realization devices with narrow effective bandgaps, inherently leading relatively poor internal ...

A simple apparatus for the preparation of ketene (CH,--C =O) from acetone vapor is described by Ott, Schr6ter, and Packendofff (1). A more rigid and convenient apparatus has been designed and used by the writer (Fig. 1). Pyrex glass used in both the filamentsupport and bulb reduces the possibility of cracking or breaking. The removable filament-support makes it possible to replace the filament ...

Highly accurate group delay measurements in long singlemode fibers were achieved over the full 1200-1600 nm spectral range by measuring phase shifts of a modulated lightwave. The high modulation frequency is shifted down to the kilohertz range using a second optical modulation at the fiber output end, so that low-frequency ultrasensitive detection and phase measurement can be performed with hig...

Full-color, three-dimensional images of objects under incoherent illumination are obtained by a digital holography technique. Based on self-interference of two beam-split copies of the object's optical field with differential curvatures, the apparatus consists of a beam-splitter, a few mirrors and lenses, a piezo-actuator, and a color camera. No lasers or other special illuminations are used fo...

Emergency l ight ing systems are frequently employed as a required safety feature within business premises. These systems comprise essentially of a control circuit, a battery pack, a trickle charging circuit, and either an in-built incandescent lamp, or an inverter that will allow the battery supply to drive the existing fluorescent tubes. It is the latter version, and the requisite DC-AC inver...

AIM This was to determine the temperature changes produced in dentine discs of primary teeth placed below a glass ionomer, microhybrid flow resin or microhybrid resin during the photocuring process with conventional halogen lamps and LEDs at different distances. STUDY DESIGN Experimental design. MATERIALS AND METHODS This in vitro study was carried out in the research laboratory of the Univ...

In companies or goods storage places, to see the value of load current in RST phase, we still use Clamp Ampere and doing power distribution using manual work by moving on phase from one MCB another until it is evenly distributed so that process takes time. this study, method observation literature study was used implement ACS712 sensor as a prototype splitter automation system 3-phase source ba...

In order to reduce the heat transfer between indoor and outdoor environments influence of ambient temperature fluctuation on environment, adding micro-PCM building envelope is one effective means. Micro-PCM can ?intelligently? control by absorbing or releasing during phase change maintain stability. this paper, temperature-adjustable mortar was prepared using with a 25?C, painted surface cement...

An egg incubator is a tool that helps the process of hatching eggs using an electric heater and equipped with rack functions to evenly distribute heat in incubator. Good temperature control something greatly affects results. In this study, system was designed PID method Ziegler Nichols Open Loop Step Response tuning method. The specifically for free-range chicken which require normal 37 °C-39 °...