Lanthanum

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Lanthanum is a chemical element with the symbol La and atomic number 57. (Wikipedia.org)






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2020 IEEE International Conference on Plasma Science (ICOPS)

IEEE International Conference on Plasma Science (ICOPS) is an annual conference coordinated by the Plasma Science and Application Committee (PSAC) of the IEEE Nuclear & Plasma Sciences Society.


2020 IEEE International Magnetic Conference (INTERMAG)

INTERMAG is the premier conference on all aspects of applied magnetism and provides a range of oral and poster presentations, invited talks and symposia, a tutorial session, and exhibits reviewing the latest developments in magnetism.


2020 Joint Conference of the IEEE International Frequency Control Symposium and International Symposium on Applications of Ferroelectrics (IFCS-ISAF)

Ferroelectric materials and applications


2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII)

The world's premiere conference in MEMS sensors, actuators and integrated micro and nano systems welcomes you to attend this four-day event showcasing major technological, scientific and commercial breakthroughs in mechanical, optical, chemical and biological devices and systems using micro and nanotechnology.The major areas of activity in the development of Transducers solicited and expected at this conference include but are not limited to: Bio, Medical, Chemical, and Micro Total Analysis Systems Fabrication and Packaging Mechanical and Physical Sensors Materials and Characterization Design, Simulation and Theory Actuators Optical MEMS RF MEMS Nanotechnology Energy and Power


2019 41st Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC)

The conference program will consist of plenary lectures, symposia, workshops andinvitedsessions of the latest significant findings and developments in all the major fields ofbiomedical engineering.Submitted papers will be peer reviewed. Accepted high quality paperswill be presented in oral and postersessions, will appear in the Conference Proceedings and willbe indexed in PubMed/MEDLINE & IEEE Xplore


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Antennas and Propagation, IEEE Transactions on

Experimental and theoretical advances in antennas including design and development, and in the propagation of electromagnetic waves including scattering, diffraction and interaction with continuous media; and applications pertinent to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques.


Applied Superconductivity, IEEE Transactions on

Contains articles on the applications and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Power applications include magnet design as well asmotors, generators, and power transmission


Device and Materials Reliability, IEEE Transactions on

Provides leading edge information that is critical to the creation of reliable electronic devices and materials, and a focus for interdisciplinary communication in the state of the art of reliability of electronic devices, and the materials used in their manufacture. It focuses on the reliability of electronic, optical, and magnetic devices, and microsystems; the materials and processes used in the ...


Dielectrics and Electrical Insulation, IEEE Transactions on

Electrical insulation common to the design and construction of components and equipment for use in electric and electronic circuits and distribution systems at all frequencies.


Display Technology, Journal of

This publication covers the theory, design, fabrication, manufacturing and application of information displays and aspects of display technology that emphasize the progress in device engineering, device design, materials, electronics, physics and reliabilityaspects of displays and the application of displays.


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Most published Xplore authors for Lanthanum

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Xplore Articles related to Lanthanum

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Production Cross Sections for (n,t) Reactions in Some Medium and Heavy Mass Nuclei at 14.6 MeV

IEEE Transactions on Nuclear Science, 1979

The cross section for (n, t) reaction of 14.6 MeV neutrons with isotopes of the natural elements calcium, iron, yittrium, and lanthanum, and with enriched isotopes strontium-86, calcium-114, tellurium-130, and thallium-205 were measured by the activation technique using high-energy resolution gamma-ray spectrometry. The experimentally determined values of the cross sections are in good agreement with values calculated by an empirical ...


Investigation of LaBr/sub 3/ detector timing resolution

IEEE Nuclear Science Symposium Conference Record, 2005, 2005

Lanthanum bromide (LaBr/sub 3/) scintillation detectors are currently being developed for use in time-of-flight (TOF) PET. In recent years, studies have been aimed at the parameterization of the LaBr/sub 3/ scintillation properties. We have utilized the findings of these studies in the development of simulation tools to investigate and predict the performance of TOF PET detectors of realistic geometries. Here, ...


Theoretical investigations of temperature-compensated cuts for vibrating beam LGT resonators

2007 IEEE International Frequency Control Symposium Joint with the 21st European Frequency and Time Forum, 2007

In this paper, the possibility of temperature-compensated cuts for different kinds of vibrations in Langatate resonators is investigated. Theoretical investigations of vibrating beam resonators with a rectangular cross-section in extensional, flexural and torsional modes are given.


Microstructure control in the growth of large area Tl-2212 thin films

IEEE Transactions on Applied Superconductivity, 2003

Large area high temperature superconducting thin films are needed for the implementation of a range of passive microwave devices. We have been investigating the critical processing issues that control the surface resistance values in 2 inch films grown on lanthanum aluminate substrates, including the possibility of batch processing wafers in a vertical geometry. We have shown that the microstructure of ...


Diode-laser pumped erbium-doped fluorozirconate fibre amplifier for the 1530 nm communications window

Electronics Letters, 1990

An erbium-doped fluorozirconate fibre amplifier has been pumped at 1480 nm using a semiconductor diode laser. The small signal gain was 15 dB for 25 mW launched pump power. The ASE bandwidth was 45 nm and the predicted noise figure was 5 dB.<<ETX>>


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IEEE-USA E-Books

  • Production Cross Sections for (n,t) Reactions in Some Medium and Heavy Mass Nuclei at 14.6 MeV

    The cross section for (n, t) reaction of 14.6 MeV neutrons with isotopes of the natural elements calcium, iron, yittrium, and lanthanum, and with enriched isotopes strontium-86, calcium-114, tellurium-130, and thallium-205 were measured by the activation technique using high-energy resolution gamma-ray spectrometry. The experimentally determined values of the cross sections are in good agreement with values calculated by an empirical equation. The cross section ratios of (n,t) and (n,p) reactions were calculated on the basis of the statistical model.

  • Investigation of LaBr/sub 3/ detector timing resolution

    Lanthanum bromide (LaBr/sub 3/) scintillation detectors are currently being developed for use in time-of-flight (TOF) PET. In recent years, studies have been aimed at the parameterization of the LaBr/sub 3/ scintillation properties. We have utilized the findings of these studies in the development of simulation tools to investigate and predict the performance of TOF PET detectors of realistic geometries. Here, we present a model to simulate the combined scintillator and photomultiplier tube (PMT) response to incident photons. This model allows us to study the effects of crystal response, geometry, and surface finish, PMT response, transit time spread, and noise, as well as discrimination techniques on the coincidence resolving time achievable in various detector configurations. Results from the simulations are benchmarked against several experimental measurements with two different PMTs and LaBr/sub 3/ crystals of varying cerium concentration and geometry. A comparison is also made to the time resolution achievable with LYSO. Good agreement between measurement and simulation has been achieved with detectors consisting of 4/spl times/4/spl times/30 mm/sup 3/ crystals suitable for use in a TOF PET scanner. Ultimately, this guides the improvement of TOF detectors by identifying the individual contribution of each detector component on the time resolution that can be achieved.

  • Theoretical investigations of temperature-compensated cuts for vibrating beam LGT resonators

    In this paper, the possibility of temperature-compensated cuts for different kinds of vibrations in Langatate resonators is investigated. Theoretical investigations of vibrating beam resonators with a rectangular cross-section in extensional, flexural and torsional modes are given.

  • Microstructure control in the growth of large area Tl-2212 thin films

    Large area high temperature superconducting thin films are needed for the implementation of a range of passive microwave devices. We have been investigating the critical processing issues that control the surface resistance values in 2 inch films grown on lanthanum aluminate substrates, including the possibility of batch processing wafers in a vertical geometry. We have shown that the microstructure of vertically-processed films shows a systematic variation in microstructure from top to bottom which can seriously degrade the uniformity of the superconducting properties. We have also used electron backscattered diffraction to analyze the fine-scale mosaic structure of thin films of varying thickness and processing conditions to show that the best surface resistance values are not found in films with the sharpest epitaxial relationship between the substrate and film. We propose an explanation for this counterintuitive observation based on how the films can relieve stresses generated during processing.

  • Diode-laser pumped erbium-doped fluorozirconate fibre amplifier for the 1530 nm communications window

    An erbium-doped fluorozirconate fibre amplifier has been pumped at 1480 nm using a semiconductor diode laser. The small signal gain was 15 dB for 25 mW launched pump power. The ASE bandwidth was 45 nm and the predicted noise figure was 5 dB.<<ETX>>

  • Laser diode pumped Pr/sup 3+/-doped and Pr/sup 3+/-Yb/sup 3+/-codoped fluoride fiber amplifiers operating at 1.3 mu m

    Both Pr/sup 3+/-doped and Pr/sup 3+/-Yb/sup 3+/-codoped singlemode fibres with high numerical apertures are pumped by laser diodes with InGaAs/GaAs strained quantum well structures. A net gain of 5.2 dB is obtained from Pr/sup 3+/-doped fluoride fibre pumped by laser diodes operating at 1.1017 mu m and a net gain of 3.2 dB is obtained from Pr/sup 3+/-Yb/sup 3+/-codoped fibre pumped by laser diodes operating at 0.98 mu m. The pumping efficiency difference between Pr/sup 3+/-doped and Pr/sup 3+/-Yb/sup 3+/-codoped fibre is discussed.<<ETX>>

  • A PLZT optical phase modulator and its applications

    An electrooptic phase modulator was designed and fabricated, using the quadratic electrooptic effect in PLZT (lead lanthanum zirconate titanate) ceramic of composition 10/65/35. The modulator can be operated at either the fundamental or double frequency of the AC signal driver. The modulator proved effective as a phase modulation device in a phase-detection-based measurement of a small birefringence shift in thin-film materials.<<ETX>>

  • Kinetic Model for Phosphorus Removal from the Pre-Dams by Rare Earth Adsorbent

    Pre-reservoirs are small reservoirs having an average theoretical water retention time of a few days. They are situated immediately above the larger main reservoir or lake, whose nutrient loading it is their purpose to reduce. Rare earth sorbents were put into pre-dams to purify pollutants in water. A theoretical deduction showed that low-concentration phosphate adsorption process accorded with a second-order kinetic equation according to academic hypothesis. The result was validated by the phosphate adsorption onto rare earth adsorbent. The factor (m/V)b had the close relation with the adsorption speed and the adsorbent dosage, intensity exponent b=0.53 (0¿b¿1) in this test condition. All the results demonstrated that low-phosphate adsorption on the adsorbent surface was mono-layer chemisorption and that the hypothesis of kinetic inference was reasonable in pre-dams.

  • Electrical Properties of Undoped and Lanthanum Doped BaTi0.6Zr0.4O3

    Lanthanum doped BaTi<sub>0.6</sub>Zr<sub>0.4</sub>O<sub>3</sub> composition x = 0.005, 0.01, 0.02, 0.05 and 0.1 in Ba<sub>1-x</sub>La<sub>x</sub>Ti<sub>0.6[ 1-5x/12]</sub>Zr<sub>0.4</sub>O<sub>3</sub> were prepared by modified chemical route. (COOH)<sub>2</sub>ldr2H<sub>2</sub>O, Ba(NO<sub>3</sub>)<sub>2</sub>, ZrOCl<sub>2</sub>ldr8H<sub>2</sub>O and La<sub>2</sub>O<sub>3</sub> are used to precipitate barium oxalate hydrate, lanthanum oxalate hydrate and zirconium oxy-hydroxide from its water solution onto the surface of suspended TiO<sub>2</sub> particles. The lanthanum doped BaTi<sub>0.6</sub>Zr<sub>0.4</sub>O<sub>3</sub> composition was found to be cubic by XRD analysis. A gradual shift of 2thetas angles to the higher angle with increasing lanthanum percentage in the BTZ reveals the contraction of perovskite lattice. The frequency dependence of dielectric permittivity and loss tan delta of the ceramics has been investigated. It is found that dielectric permittivity (epsiv<sub>tau</sub>) decreases and loss tan delta decreases with increase in lanthanum percentage. Neither of the samples shows semiconductivity, which is believed to be because of titanium vacancy compensation.

  • Self-Assembled Lanthanum Gallate Microdots and Holes on Si

    Doped lanthanum gallate thin films deposited on Si(111) substrates by radio frequency (RF)-sputtering reveal the presence of self-assembled islands that are of the order of microns in size. These microdots are accompanied by slightly larger holes which form part of the same overall arrangement as the microdots. We present the results of our scanning electron microscope (SEM) and energy dispersive spectrometry (EDS) investigations of these microdots. The formation of the microdots is compared to that of quantum dots (QDs) on semiconductor surfaces, and a model is proposed for the formation process of the microdots and the holes by analogy with the nucleation and growth of islands at the nano-scale



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