A5066193965- Particle accelerators and beam dynamics
- Gas Sensing Nanomaterials and Sensors
- Particle Accelerators and Free-Electron Lasers
- Advanced Chemical Sensor Technologies
- Superconducting Materials and Applications
- Analytical Chemistry and Sensors
- Gyrotron and Vacuum Electronics Research
- Magnetic confinement fusion research
- Pulsed Power Technology Applications
- Constraint Satisfaction and Optimization
- Advanced Data Storage Technologies
- Spectroscopy and Laser Applications
- Advanced Database Systems and Queries
- Transition Metal Oxide Nanomaterials
- Sensor Technology and Measurement Systems
- Electron and X-Ray Spectroscopy Techniques
- Data Mining Algorithms and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Particle Detector Development and Performance
- Chalcogenide Semiconductor Thin Films
- Environmental Monitoring and Data Management
- Industrial Technology and Control Systems
- Nuclear Physics and Applications
- Industrial Automation and Control Systems
- Advanced Computational Techniques and Applications
San Jose State University
2023
Sensors (United States)
2023
University of Tübingen
2016-2022
Massachusetts Institute of Technology
1989-2003
University of Southern California
1999
This article presents a case study in building and (re)using an ontology specific application domain-air campaign planning. The describes the common built to serve as basis for knowledge sharing discusses several issues raised its construction.
Efforts to create a sustainable hydrogen economy are gaining momentum as governments all over the world investing in production, storage, distribution, and delivery technologies develop infrastructure. This involves transporting gaseous or liquid form using carrier gases such methane, ammonia, mixtures of methane hydrogen. Hydrogen is colorless, odorless gas can easily leak into atmosphere leading economic loss safety concerns. Therefore, deployment robust low-cost sensors for various...
Lead sulfide (PbS) is a p-type semiconductor that often applied in photodetectors and solar cells. One major problem researchers are regularly confronted with the loss of performance when operated air. The sensitivity to ambient, however, makes it an interesting material for application gas sensors. Although lot research has been focused on aging PbS, influencing factors associated changes still matter debate. Resistance measurements differently prepared PbS samples as sensors detection NO2...
The demand for gas sensors that can detect gases selectively at low temperatures has increased steadily over recent years. Most devices use semiconducting metal oxides as sensing materials which often require high operation and suffer from a lack of selectivity. Semiconducting sulfides were found to be reasonable alternative the application in temperatures. Since are relatively new class applied sensors, there is little work on mechanisms overall characteristics these materials. In this...
Here, the splitting of water from humidity at surface WO3 is reported. The production hydrogen occurs under mild conditions 300 °C in presence humidity. Using operando diffuse reflectance infrared Fourier transform spectroscopy and DC resistance measurements complemented with density functional theory calculations, it was possible to elucidate temperature-dependent reactions By examining multiple different nanomaterials °C, found that oxidation by generally valid for WO3. evolution detected...
WO3 is a commonly used material for gas sensing. Although great deal of research has been done on how to tune sensors based WO3, no clear consensus exists what characteristics are inherent the metal oxide: This work looks at six different samples and aims identify which common all materials. Specifically, interaction with humidity examined.
The MIT-Bates Linear Accelerator Center is in the process of constructing an electron storage ring. 190-m ring will be used for internal target experiments with stored beams. It also as a pulse stretcher to provide external beams high duty factors. present design incorporates low beta region /sub x/ 1 m and 4.5 m-space between quadrupoles at location. contain up 80 mA using two turn injection. Extraction one-half integer resonance produce 50 mu A factor over 80%. Injection occur kHz. Design...
An emittance measuring system has been installed at the Bates Linear Accelerator Center. The consists of three wire scanners used to measure electron beam profile, and a microcomputer for data acquisition processing. scanner measures horizontal vertical size with possible resolution 25 mu m. phase spaces can then be determined. Results measurements are presented. Calculations relating theoretical accuracy distance separating waist's location also Another technique used. This involves using...
The markets for modern low-cost electrochemical gas sensors have been growing longer than around. Energy include the oil, and electricity industries as well new developing fast green energy sectors. primary gases to detect combustible hydrocarbons, oxygen, toxic gases. Specifically, we are interested in methane (blue green), ammonia, H 2 renewable sectors but hydrocarbon fuels CO a greenhouse emission. reasons monitoring crosscut all areas of business applications production, transport,...
Hydrogen is one of the most important energy gases as it carbon free and therefore can result in emission reduction greenhouse gas CO 2 . However, hydrogen itself a secondary gas. As gas, does not directly add to global warming by entrapping heat. Instead, reacts with molecules atmosphere that are needed remove CH 4 comparably short-lived approximately 10 years compared which last for centuries. traps at least 100 times much heat Considering difference capacities , combined lifetime, if same...
The first commercially available semiconducting metal oxide gas sensor, patented by Taguchi in the 1970s, was based on SnO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> . Even today, most produced sensors are As computing power becomes more prevalent and used a broader range of applications, materials with complementary sensing characteristics will be needed. WO xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> is promising material...
Near Ambient Pressure Scanning Photoelectron Microscopy adds to the widely used photoemission spectroscopy and its chemically selective capability two key features: (i) possibility analyse samples in a more realistic environmental, gas pressure condition, (ii) investigate system at relevant spatial scale. To achieve these goals approach developed ESCA beamline Elettra Synchrotron facility combines submicron lateral resolution of Microscope with custom designed Cell where up 0.1 mbar is...
The design of the control system for MIT's pulse stretcher ring is described. Heavy use made standard hardware and software elements. Particular emphasis given to a true distributed system, one that can expand both at data acquisition/control processing end. For this purpose, method proposed avoid increasing traffic on network when adding more computers. Issues related real-time response user interfaces are also treated. Measurements summarized.< <ETX...
A linac beam profile measurement system using wire scanners has been implemented at the Bates Linear Accelerator Center. Obtaining an optimum focussing solution is facilitated by system. nearly noninvasive size made of two beams which are accelerated simultaneously in recirculating linac. The scanner's mechanical accuracy near one mil. Beam measurements reproducible to a few mils.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Results of measurements on 24 the 128 new quadrupole magnets for pulse storage/stretcher ring currently under construction at MIT-Bates Accelerator Center are presented. At outset it was decided to measure excitation curves every quadrupole, and same time have enough sensitivity extract harmonic content. Measurements indicate that one can remeasure a quadrupole's strength reproduce value (B/sub o/L/sub eff//a) versus current better than 0.1%. also reserve polarity remnant field by repeated...
Oxygen is the third-most abundant element on this planet and essential to life, lifestyle of humans virtually all sentient life. We need O 2 live additionally use it for both heating transportation. Since so in our everyday there are several applications where oxygen levels be controlled or maintained within a certain range. To make sure that level necessary range, devices needed can monitor feedback/communicate continuously. There types chemical gas sensors which include chemoresistive...
The design of a fast transverse electromagnetic (TEM) kicker for use in the Bates Pulse Stretcher Ring is described. It provides 1-mrad/m kick 1-GeV electron beam, with transition times below 25 ns and 1% flat top. +or-10 kV driver uses switching technique based on MOSFET power transistors that allow complete control over timing simplifies construction greatly. Calculations show reliability such orders magnitude better than provided by present designs.< <ETX...