Xem 1-17 trên 17 kết quả Ultrasonic systems
  • The idea of using ultrasonic waves in medical and engineering fields came from military applications of sound waves in sonar systems. Sokolov, Firestone, Simons, and several other researchers are among the ones who studied this high frequency kind of wave in the first half of twentieth century. Ultrasonic waves are defined as those with frequencies higher than 20 kHz. The constant development of data acquisition systems and probes seems to work, removing the upper limit of the wave frequency that can be acquired.

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  • This book reviews a big window of opportunity for piezoelectric ceramics, such as new materials, material combinations, structures, damages and porosity effects. In addition, applications of sensors, actuators, transducers for ultrasonic imaging, positioning systems, energy harvesting, biomedical and microelectronic devices are described. The book consists of fourteen chapters. The genetic algorithm is used for identification of RLC parameters in the equivalent electrical circuit of piezoelectric transducers.

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  • If we are to realize the everyday benefits promised by pervasive computing and context- aware applications, we must first develop the foundation systems that will make those applications easy to develop, to deploy, and to maintain. We must develop systems that provide the necessary contextual information with accuracy, robustness, and scalability. We must also address the technical challenges of engineering these systems for use by humans and mobile devices in indoor environments.

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  • The development of ultrasonic volumetric imaging is closely linked to the development of systems that are able to operate bidimensional array transducers. These arrays are useful for ultrasonic volumetric imaging, because they produce steered and focused beams throughout a volume of interest.

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  • In this Unit, the operation of each block on Main Unit will be introduced. After study complete, users are able to use KL-62001 as measurement and assist tool for KL-620 experiments. Discussion: When connecting CHIP to the GND, the analog signal received from A/D Converter will send to single chip for decoding and output to 7 segment display? When sending the analog signal to the PC, the signal should be converted to digital format. As the result, this technique will be used when connecting the main unit to the PC. Check next exercise?...

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  • This book brings together some of the latest research in robot applications, control, modeling, sensors and algorithms. Consisting of three main sections, the first section of the book has a focus on robotic surgery, rehabilitation, self-assembly, while the second section offers an insight into the area of control with discussions on exoskeleton control and robot learning among others. The third section is on vision and ultrasonic sensors which is followed by a series of chapters which include a focus on the programming of intelligent service robots and systems adaptations....

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  • The current book consists of eighteen chapters divided into three sections. Section I includes nine topics in characterization techniques and evaluation of advanced ceramics dealing with newly developed photothermal, ultrasonic and ion spattering techniques, the neutron irradiation and the properties of ceramics, the existence of a polytypic multi-structured boron carbide, the oxygen isotope exchange between gases and nanoscale oxides and the evaluation of perovskite structures ceramics for sensors and ultrasonic applications....

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  • Growing linkages between MFIs and the banking system in Africa appear to be mutually beneficial. MFIs rely on banks for a variety of services, including deposit facilities, liquidity management services, and in some cases, emergency credit lines to cover cash shortfalls. For banks, the benefits are the opportunity to expand their client base through MFIs, and to expand their operations through the network of MFIs (including in the rural sector).

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  • In November 1999, the Department of Dental Surgery at Chubu National Hospital, National Institute of Longevity Science (Now: National Center for Geriatrics and Gerontologyʣ, established the first oral care outpatient clinic in the nation. We have instructed many people in methods of systematic oral care, and the service has earned a good reputation.

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  • Symantec has established some of the most comprehensive sources of Internet threat data in the world through the Symantec™ Global Intelligence Network. More than 240,000 sensors in over 200 countries and territories monitor attack activity through a combination of Symantec products and services such as Symantec DeepSight™ Threat Management System, Symantec Managed Security Services and Norton™ consumer products, as well as additional third-party data sources.

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  • The vertical cascade flue system from Evinox prevents multiple flue penetrations through roofs or walls by allowing up to 11 boilers on 11 levels to share a common 110mm flue riser, making it ideal for modern buildings with glass facades. The Evinox range of wall hung, condensing system and combination boilers are designed for use with our unique cascade flue system for apartment installations. An inbuilt non return valve on the boiler fan, allows for direct connection to the cascade system.

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  • If used in a way that acknowledges that humans are an intrinsic part of ecosystems, the phrase “healthy ecosystem” can be justified: humans are implicated in activities that degrade ecosystems, yet humans can also be agents for the maintenance or restora- tion of ecosystems. And the health of humans is in some way a measure of the health of the ecosystem in which they live and depend, and vice versa. ‘Health’ is also powerful metaphor for the condition of an eco- system, and ecosystem approaches to human health make critical contributions to public health.

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  • Whereas spark erosion and lasermachining are suitable for any metal, the use of mechanical precision machining and the tools suitable for this type depend on the stability of the alloy. For brass and copper, natural diamondmicrotools are suitable and widely used, while for stainless steel and nickel- based alloys, hardmetal tools are needed. Figure 1.3 shows a natural diamond cutter, whereas Figure 1.4 shows a hard metal drill. Figure 1.5 shows photos of a rhodium honeycombmicrochannel catalyst system.

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  • This chapter include all of the following content: Dipsticks, float systems, pressure-measuring devices (hydrostatic system), capacitive devices, ultrasonic level gauge, radar (microwave) sensors, nucleonic (or radiometric) sensors, other techniques, choice between different level sensors.

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  • The level of surface water quality protection is variable around the world in large part due to the relative effectiveness of environmental regulation and the degree to which science influences the regulatory process. In the United States, at the federal level, the Total Maximum Daily Load (TMDL) has been an effective policy and water quality management tool for dealing with both point source and non-point source pollution.

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  • BMW first introduced Park Distance Control (PDC) on the 7 series (E32) in 1992. PDC is a driver assistance system that facilitates parking and manoeuvring in confined spaces. The rear area of the vehicle is monitored by four ultrasonic transducers that are integrated into the rear bumper. On some vehicles, the front area of the vehicle is also monitored by four additional ultrasonic transducers in the front bumper. Ultrasonics is the term used to describe sound above the human hearing range at frequencies between 20 kHz and 1000 MHz.

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  • (BQ) Part 2 book "Ultrasound imaging and therapy" presents the following contents: Diagnostic ultrasound imaging (ultrasound elastography, quantitative ultrasound techniques for diagnostic imaging and monitoring, task based design and evaluation of ultrasonic imaging systems,...), therapeutic and interventional ultrasound imaging.

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