In this paper we design and implement an embedded surveillance system by use of ultrasonic signal coding of ultrasonic sensors with multiple pyroelectric infrared sensors (PIR) to detect an intruder in a home or a storehouse. The PIR sensors are placed on the ceiling, and the ultrasonic sensor module consists of a transmitter and a receiver which are placed in a line direction; however, ultraso...

Ultrasonic receiver circuit with Phase-locked loop 4046 Ultrasonic amplifier with high amplification factor · Transformer-coupled ultrasonic transmitter circuit. General-Purpose CMOS Rail-to-Rail Amplifier. ADP7104. 20 V, 500 mA, Low The circuit shown in Figure 1 is a completely self-contained distance sensor that utilizes an ultrasonic transmitter and sensitive analog receiver in conjunction.

primary immune thrombocytopenia is an acquired bleeding disorder with no clinically apparent cause of thrombocytopenia. clinical indicators of itp include easy bruising of the skin, prolonged bleeding on injury, mucocutaneous lesions such as petechiae and ecchymosis, epistaxis, gastrointestinal bleeding, hematuria and bleeding from the gums. it is important for a dentist to be aware of the clin...

background & aims of the study: corrosion and scaling play undesirable effects on transmission and distribution system of drinking water. the aim of this study was to assess the corrosion and scaling potential of drinking water resources in babol city. materials and methods: totally, 54 water samples were collected from 27 wells in spring and autumn. calciu m hardness, ph, total alkalinity, tot...

oriental hybrid lily “arabian red” mother scales were stored in moist cocopeat and perlite (1:1) for 3 or 5 months at 25 ̊c. the numbers of scale bulblets per mother scale were nearly identical in two durations. increasing storage duration promoted the growth of roots (number and length) and no. scales per scale bulblets. and, diameters of scale bulblets were more in longer storage duration (5 m...

background: in helical tomotherapy (ht), the scaling factor (sf) is the time in seconds that each leaf viewing a target would need to be open to deliver the prescribed dose. the sf is patient-specific and is used to calculate the rotational period of the gantry, and the total treatment time (ttt) of the ht. the sf is generally difficult to estimate. currently, it takes about one hour to fully o...

in this paper, a new non-contact ultrasonic abrasive finishing mechanism is designed and fabricated. this mechanism combines the function of ultrasonic vibrations and the magnetic abrasive finishing (maf) process. a permanent magnet which is mounted on a horn has been used as the processing tool. this polishing tool is vibrated at an ultrasonic frequency with piezo-electric actuators. ultrasoni...

The Scaling Law for the Discrete Kinetic Growth Percolation Model The critical exponent of the total number of finite clusters α is calculated directly without using scaling hypothesis both below and above the percolation threshold pc based on a kinetic growth percolation model in two and three dimensions. Simultaneously, we can calculate other critical exponents β and γ, and show that the scal...

PURPOSE A variety of instruments, including circular staplers, ultrasonic scalpels, lasers, and bipolar electrothermal devices, are currently used when performing a hemorrhoidectomy. This study compared outcomes between hemorrhoidectomies performed with an ultrasonic scalpel and conventional methods. METHODS The study was a randomized prospective review of data available between May 2013 and ...