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Hans U Stauffer, K Arafat Rahman, Mikhail N Slipchenko, Sukesh Roy, James R Gord, Terrence R Meyer
Interference-free hybrid femtosecond/picosecond vibrational coherent anti-Stokes Raman scattering (CARS) of nitrogen is reported for temperature measurements of 1300-2300 K in high-pressure, laminar H2 -air and CH4 -air diffusion flames up to 10 bar. Following coherent Raman excitation by 100 fs duration pump and Stokes pulses, a time-asymmetric probe pulse is used for the detection of spectrally resolved N2 CARS signals at probe delays as early as ∼200-300  fs. This allows for full rejection of nonresonant contributions while being independent of collisions for single-shot precision of ±2% at elevated pressures...
October 15, 2018: Optics Letters
Sara L Johnson, Douglas A Christensen, Christopher R Dillon, Allison Payne
In focused ultrasound (FUS) thermal ablation of diseased tissue, acoustic beam and thermal simulations enable treatment planning and optimization. In this study, a treatment-planning methodology that uses the hybrid angular spectrum (HAS) method and the Pennes' bioheat equation (PBHE) is experimentally validated in homogeneous tissue-mimicking phantoms. Simulated three-dimensional temperature profiles are compared to volumetric MR thermometry imaging (MRTI) of FUS sonications in the phantoms, whose acoustic and thermal properties are independently measured...
October 15, 2018: International Journal of Hyperthermia
H P Kok, G Schooneveldt, A Bakker, R de Kroon-Oldenhof, L Korshuize-van Straten, C E de Jong, E Steggerda-Carvalho, E D Geijsen, L J A Stalpers, J Crezee
INTRODUCTION: On-line adaptive hyperthermia treatment planning can be useful to suppress treatment limiting hot spots and improve tumor temperatures during locoregional hyperthermia. This requires adequate prediction of changes in heating patterns after phase-amplitude steering. We investigated the predictive value of simulated SAR and temperature for changes in measured temperature after phase-amplitude steering during locoregional hyperthermia. METHODS: All treatment sessions of 75 patients with pelvic malignancies treated between September 2013 and March 2018 were evaluated...
October 9, 2018: International Journal of Hyperthermia
Christopher Brian Abraham, Jak Loree-Spacek, Robert Andrew Drainville, Samuel Pichardo, Laura Curiel
Three different magnetic resonance imaging (MRI) coils were developed and assessed for use with an experimental platform designed to generate hyperthermia in mice using magnetic resonance-guided focused ultrasound (MRgFUS). An ergonomic animal treatment bed was integrated with MRI coils. Three different coil designs optimized for small targets were tested, and performance in targeting and conducting accurate temperature imaging was evaluated. Two transmit/receive surface coils of different diameters (4 and 7 cm) and a transmit-only/receive-only (TORO) coil were used...
October 8, 2018: International Journal of Hyperthermia
Qi Zhu, Siyuan Li, Jianfeng Jin, Zhixin Xu, Xiaodong Li, Xudong Sun, Ji-Guang Li
Temperature-sensitive luminescent materials have aroused great interest for practical applications in optical sensors. Layered rare-earth hydroxides (LRHs) possess rich interlayer chemistry and adjustable composition, thus they are the charming candidates for designing functional materials, usually through an ion exchange processing. Surprisingly, in this work, the intercalation of neutral Tb (III) complex rather than ion exchange was successfully performed in situ into the gallery of Y/Eu binary LRHs by hydrothermal processing...
October 5, 2018: Chemistry, An Asian Journal
Karolina Elzbieciak, Lukasz Marciniak
A new approach to enhance the sensitivity of transition metal ion based nanocrystalline luminescent thermometer is presented. It was shown that the increase of Cr3+ concentration in three types of garnet host namely Y3 Al5 O12 , Y3 Ga5 O12 , and Y3 Al2 Ga3 O12 allows for significant enhancement of their performance in non-contact thermometry. This phenomenon is related to the weakening of the crystal field strength due to enlargement of average Cr3+ -O2- distance at higher Cr3+ concentrations. By increasing Cr3+ concentration from 0...
2018: Frontiers in Chemistry
Emad S Ebbini, Claudio Simon, Dalong Liu
No abstract text is available yet for this article.
March 2018: IEEE Signal Processing Magazine
Shu Hu, Bi-Ju Liu, Jia-Min Feng, Cheng Zong, Kai-Qiang Lin, Xiang Wang, De-Yin Wu, Bin Ren
Precise measurement of the temperature right at the surface of thermoplasmonic nanoparticles is a grand challenge but extremely important for the photochemical reaction and photothermal therapy. We present here a method capable of measuring the surface temperature of plasmonic nanostructures with surface-enhanced Raman spectroscopy (SERS), which is not achievable by existing methods. We observe a sensitive shift of stretching vibration of phenyl isocyanide (PIC) molecule with temperature (0.232 cm-1/ºC) as a result of the temperature-dependent molecular orientation change...
October 3, 2018: Journal of the American Chemical Society
Anthony Fiorino, Dakotah Thompson, Swathi Yadlapalli, Chang Jiang, Orie T Shafer, Pramod Reddy, Edgar Meyhofer
Significant recent evidence suggests that metabolism is intricately linked to the regulation and dysfunction of complex cellular and physiological responses ranging from altered metabolic programs in cancers and aging to circadian rhythms and molecular clocks. While the metabolic pathways and their fundamental control mechanisms are well established, the precise cellular mechanisms underpinning, for example, enzymatic pathway control, substrate preferences or metabolic rates, remain far less certain. Comprehensive, continuous metabolic studies on model organisms, such as the fruit fly Drosophila melanogaster, may provide a critical tool for deciphering these complex physiological responses...
September 27, 2018: Scientific Reports
Henrik Odéen, Joshua de Bever, Lorne W Hofstetter, Dennis L Parker
PURPOSE: To implement and evaluate an efficient multiple-point MR acoustic radiation force imaging pulse sequence that can volumetrically measure tissue displacement and evaluate tissue stiffness using focused ultrasound (FUS) radiation force. METHODS: Bipolar motion-encoding gradients were added to a gradient-recalled echo segmented EPI pulse sequence with both 2D and 3D acquisition modes. Multiple FUS-ON images (FUS power > 0 W) were interleaved with a single FUS-OFF image (FUS power = 0 W) on the TR level, enabling simultaneous measurements of volumetric tissue displacement (by complex subtraction of the FUS-OFF image from the FUS-ON images) and proton resonance frequency shift MR thermometry (from the OFF image)...
September 26, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Poya Yasaei, Zahra Hemmat, Cameron J Foss, Shixuan Justin Li, Liang Hong, Amirhossein Behranginia, Leily Majidi, Robert F Klie, Michel W Barsoum, Zlatan Aksamija, Amin Salehi-Khojin
Van der Waals interactions in 2D materials have enabled the realization of nanoelectronics with high-density vertical integration. Yet, poor energy transport through such 2D-2D and 2D-3D interfaces can limit a device's performance due to overheating. One long-standing question in the field is how different encapsulating layers (e.g., contact metals or gate oxides) contribute to the thermal transport at the interface of 2D materials with their 3D substrates. Here, a novel self-heating/self-sensing electrical thermometry platform is developed based on atomically thin, metallic Ti3 C2 MXene sheets, which enables experimental investigation of the thermal transport at a Ti3 C2 /SiO2 interface, with and without an aluminum oxide (AlOx ) encapsulating layer...
September 4, 2018: Advanced Materials
Siyu Liu, Ruochong Zhang, Zesheng Zheng, Yuanjin Zheng
This paper reviews the theories and applications of electromagnetic⁻acoustic (EMA) techniques (covering light-induced photoacoustic, microwave-induced thermoacoustic, magnetic-modulated thermoacoustic, and X-ray-induced thermoacoustic) belonging to the more general area of electromagnetic (EM) hybrid techniques. The theories cover excitation of high-power EM field (laser, microwave, magnetic field, and X-ray) and subsequent acoustic wave generation. The applications of EMA methods include structural imaging, blood flowmetry, thermometry, dosimetry for radiation therapy, hemoglobin oxygen saturation (SO₂) sensing, fingerprint imaging and sensing, glucose sensing, pH sensing, etc...
September 21, 2018: Sensors
Babak Bazrafshan, Ahmad Koujan, Frank Hübner, Christian Leithäuser, Norbert Siedow, Thomas J Vogl
The purpose of this study was to develop a thermometry software tool for temperature monitoring during laser-induced interstitial thermotherapy (LITT). C++ programming language and several libraries including DICOM Toolkit, Grassroots DICOM library, Insight Segmentation and Registration Toolkit, Visualization Toolkit and Quasar Toolkit were used. The software's graphical user interface creates windows displaying the temperature map and the coagulation extent in the tissue, determined by the magnetic resonance imaging (MRI) thermometry with the echo planar imaging sequence and a numerical simulation based on the radiation and heat transfer in biological tissues, respectively...
September 22, 2018: Biomedizinische Technik. Biomedical Engineering
Chuanli Cheng, Chao Zou, Qian Wan, Yangzi Qiao, Min Pan, Changjun Tie, Dong Liang, Hairong Zheng, Xin Liu
PURPOSE: The aim of this study was to propose dual-step iterative temperature estimation (DITE) of a fat-referenced proton resonance frequency shift (PRFS) method to improve both the accuracy and precision of temperature estimations in fat-containing tissues. METHODS: A fat-water signal model with multiple fat peaks was used to simultaneously estimate the temperature, fat/water intensity and <mml:math xmlns:mml=""> <mml:mrow> <mml:msubsup> <mml:mi>T</mml:mi> <mml:mn>2</mml:mn> <mml:mo>*</mml:mo> </mml:msubsup> </mml:mrow> </mml:math> , and field offset...
September 19, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Tiziana Cesca, Giovanni Perotto, Giovanni Pellegrini, Niccolò Michieli, Boris Kalinic, Giovanni Mattei
The laser-induced plasmon heating of an ordered array of silver nanoparticles, under continuous illumination with an Ar laser, was probed by rare-earth fluorescence thermometry. The rise in temperature in the samples was monitored by measuring the temperature-sensitive photoluminescent emission of a europium complex (EuTTA) embedded in PMMA thin-films, deposited onto the nanoparticles array. A maximum temperature increase of 19 °C was determined upon resonant illumination with the surface plasmon resonance of the nanoarray at the highest pump Ar laser power (173 mW)...
September 14, 2018: Scientific Reports
Kerstin Fiebig, Thomas Jourdan, Martin H Kock, Roswitha Merle, Christa Thöne-Reineke
Temperature monitoring during critical care provides important data required to guide treatment delivery. Body temperatureis an easily quantified clinical parameter that can yield much information concerning the health of an animal. In researchsettings, temperature has been adopted as a means to judge humane endpoints. Therefore, reliable, noninvasive, and inexpensivemethods for temperature monitoring are becoming a necessity in research laboratories. This study aimed to determinethe accuracy and agreement of using an infrared camera as an alternative method of temperature measurement in mice andto compare the accuracy of this noninvasive method with established subcutaneous, intraperitoneal, and rectal techniques...
September 12, 2018: Journal of the American Association for Laboratory Animal Science: JAALAS
F Leroux, K Pandey, R Rehbi, F Chevy, C Miniatura, B Grémaud, D Wilkowski
Topology, geometry, and gauge fields play key roles in quantum physics as exemplified by fundamental phenomena such as the Aharonov-Bohm effect, the integer quantum Hall effect, the spin Hall, and topological insulators. The concept of topological protection has also become a salient ingredient in many schemes for quantum information processing and fault-tolerant quantum computation. The physical properties of such systems crucially depend on the symmetry group of the underlying holonomy. Here, we study a laser-cooled gas of strontium atoms coupled to laser fields through a four-level resonant tripod scheme...
September 4, 2018: Nature Communications
Lei Shen, Tao-Rong Xie, Run-Zhou Yang, Yan Chen, Jian-Sheng Kang
Temperature distributions inside a living cell reflect the thermodynamics and functions of cellular components. We used a newly-developed method of mitochondrial thermometry based on Rhodamine B methyl ester, which equilibrates as a thermosensitive mixture of nonfluorescent and fluorescent resonance forms. Prostaglandin E2 (PGE2 ) is released from hepatic non-parenchymal Kupffer cells and acts as an inflammatory factor to impact various functions of hepatocytes. The activity of PGE2 on energy mechanism of hepatocytes has not been fully elucidated and in particular, which PGE2 receptor mediates the functions has been elusive...
August 30, 2018: Scientific Reports
Ricardo Morán-Navarro, Javier Courel-Ibáñez, Alejandro Martínez-Cava, Elena Conesa-Ros, Alejandro Sánchez-Pay, Ricardo Mora-Rodriguez, Jesús G Pallarés
This experiment investigates the validity of six thermometers with different measuring sensors, operation and site of application, to estimate core temperature (Tc ) in comparison to an ingestible thermometric sensor based on quartz crystal technology. Measurements were obtained before, during and after exercise in the heat, controlling the presence of air-cooling and skin sweating. Twelve well-trained men swallowed the ingestible thermometer 6 h before the trial. After pre-exercise resting measurements at 20 °C, subjects entered a heat chamber held at 40 °C...
August 22, 2018: Annals of Biomedical Engineering
Xiangfu Wang, Ye Wang, Jihong Yu, Yanyan Bu, Xiaohong Yan
An efficient soft chemistry method to modify the phase, shape and optical thermometry of NaGdF4 :2%Er3+ nano-phosphors through doping Ca2+ ion is reported. With the introduction of Ca2+ , the phase changes from the GdF3 :2%Er3+ to NaGdF4 :2%Er3+ was achieved, and the shapes of NaGdF4 :2%Er3+ were modified from irregular particles to pure hexagonal NaGdF4 microtubes. These modifications derive from the charge redistribution on the nucleus surface through internal electron charge transport between Gd3+ in a lattice and co-doped Ca2+ ion...
August 20, 2018: Optics Express
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