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Shishir Pandya, Gabriel A Velarde, Ran Gao, Arnoud S Everhardt, Joshua D Wilbur, Ruijuan Xu, Josh T Maher, Joshua C Agar, Chris Dames, Lane W Martin
Temperature- and electric-field-induced structural transitions in a polydomain ferroelectric can have profound effects on its electrothermal susceptibilities. Here, the role of such ferroelastic domains on the pyroelectric and electrocaloric response is experimentally investigated in thin films of the tetragonal ferroelectric PbZr0.2 Ti0.8 O3 . By utilizing epitaxial strain, a rich set of ferroelastic polydomain states spanning a broad thermodynamic phase space are stabilized. Using temperature-dependent scanning-probe microscopy, X-ray diffraction, and high-frequency phase-sensitive pyroelectric measurements, the propensity of domains to reconfigure under a temperature perturbation is quantitatively studied...
December 5, 2018: Advanced Materials
Christian Prinz, Paula Ramos Delgado, Thomas Wilhelm Eigentler, Ludger Starke, Thoralf Niendorf, Sonia Waiczies
OBJECTIVE: This study examines the influence of the environmental factor temperature on the 19 F NMR characteristics of fluorinated compounds in phantom studies and in tissue. MATERIALS AND METHODS: 19 F MR mapping and MR spectroscopy techniques were used to characterize the 19 F NMR characteristics of perfluoro-crown ether (PFCE), isoflurane, teriflunomide, and flupentixol. T1 and T2 mapping were performed, while temperature in the samples was changed (T = 20-60 °C) and monitored using fiber optic measurements...
December 4, 2018: Magma
D Modena, M Baragona, D Bošnački, B J T Breuer, A Elevelt, R T H Maessen, P A J Hilbers, H M M Ten Eikelder
Magnetic resonance-guided high intensity focused ultrasound (MR-HIFU) is a noninvasive thermal technique that enables rapid heating of a specific area in the human body. Its clinical relevance has been proven for the treatments of soft tissue tumors, like uterine fibroids, and for the treatments of solid tumors in bone. In MR-HIFU treatment, MR-thermometry is used to monitor the temperature evolution in soft tissue. However, this technique is currently unavailable for bone tissue. Computer models can play a key role in the accurate prediction and monitoring of temperature...
December 4, 2018: Physics in Medicine and Biology
Tobias Christopher Klima, Andreas Siegfried Braeuer
We present investigations into remote liquid temperature sensing with Raman spectroscopy using different evaluation methods for the OH stretching vibration band. Water, ethanol and ethanol saturated with nitrogen, all as liquids or liquid-like supercritical fluids, are pumped through a heated microcapillary system at elevated pressures. Raman spectra are recorded from the liquid inside the microcapillary and are evaluated with respect to the temperature sensitivity of the OH stretching vibration. The four approaches applied are (i) to evaluate the center position of the Raman OH-band, (ii) the integrated absolute difference spectrum, (iii) the intensity ratio of two regions of the OH-band, and (iv) the intensity ratio of two fitted Gaussian peaks...
December 3, 2018: Analytical Chemistry
R Shrestha, R Atluri, D P Simmons, D S Kim, T Y Choi
This research work demonstrates an innovative technique to measure the thermal conductivity of a small volume of non-volatile liquids. The method utilizes a micro-pipette thermal sensor (MPTS) (tip diameter < 2 μ m) and is based on laser point heating thermometry and transient heat transfer. A laser beam is irradiated at the sensor tip immersed in a few microliters of the test fluid and the transient temperature change is recorded with the sensor. This temperature change is dependent on the surrounding fluid's thermal properties, such as thermal conductivity and diffusivity...
November 2018: Review of Scientific Instruments
Pierre Farger, Cédric Leuvrey, Mathieu Gallart, Pierre Gilliot, Guillaume Rogez, João Rocha, Duarte Ananias, Pierre Rabu, Emilie Delahaye
The synthesis and characterization of six new lanthanide networks [Ln(L)(ox)(H2 O)] with Ln = Eu3+ , Gd3+ , Tb3+ , Dy3+ , Ho3+ and Yb3+ is reported. They were synthesized by solvo-ionothermal reaction of lanthanide nitrate Ln(NO3 )3 · x H2 O with the 1,3-bis(carboxymethyl)imidazolium [HL] ligand and oxalic acid (H2 ox) in a water/ethanol solution. The crystal structure of these compounds has been solved on single crystals and the magnetic and luminescent properties have been investigated relying on intrinsic properties of the lanthanide ions...
2018: Beilstein Journal of Nanotechnology
Bhanu P Jena, Domenico L Gatti, Suzan Arslanturk, Sebastian Pernal, Douglas J Taatjes
The 'Human Cell Atlas' project has been launched to obtain a comprehensive understanding of all cell types, the fundamental living units that constitute the human body. This is a global partnership and effort involving experts from many disciplines, from computer science, engineering to medicine, and is supported by several private and public organizations, among them, the Chan Zuckerberg Foundation, the National Institutes of Health, and Google, that will greatly benefit humanity. Nearly 37 trillion cells of various shapes, sizes, and composition, are precisely organized to constitute the human body...
November 16, 2018: Micron: the International Research and Review Journal for Microscopy
Shaoshuai Zhou, Changkui Duan, Min Yin, Xiaoli Liu, Shuo Han, Shoubao Zhang, Xiaoman Li
A novel optical thermometry is put forward, based on the cooperation of temperature-induced red shift of the charge transfer band (CTB) edge of the vanadates and thermal population of the thermally coupled energy levels (TCELs). Particularly, temperature-dependent CTB of Sm3+ (Er3+ ) doped LuVO4 was investigated from 300 to 480 K. Then, under the excitation of 360 nm at which the excitation efficiency enhances with temperature due to the temperature induced red shift of the CTB edge, temperature-dependent emissions of the TCELs of Sm3+ and Er3+ were investigated...
October 15, 2018: Optics Express
Andrea D Pickel, Ayelet Teitelboim, Emory M Chan, Nicholas J Borys, P James Schuck, Chris Dames
Individual luminescent nanoparticles enable thermometry with sub-diffraction limited spatial resolution, but potential self-heating effects from high single-particle excitation intensities remain largely uninvestigated because thermal models predict negligible self-heating. Here, we report that the common "ratiometric" thermometry signal of individual NaYF4 :Yb3+ ,Er3+ nanoparticles unexpectedly increases with excitation intensity, implying a temperature rise over 50 K if interpreted as thermal...
November 21, 2018: Nature Communications
Charmaine Childs
In this chapter, the nuance of body temperature is explored in the context of contemporary clinical medicine and technology. It takes the reader through the concept of body and shell as a route to explain the variety of temperature measurements that are observed in health and disease and the interdependence between skin and core temperature in maintaining thermal stability and thermal comfort perception. Methods for the measurement of temperature using different thermometer devices are discussed from the perspective of fundamental clinical assessment and vital signs, temperature monitoring and measurement for life-critical decision making, thermometry in mass screening, and to the future with advances in thermometry and thermography in new applications for diagnosis...
2018: Handbook of Clinical Neurology
Michael Verius, Florian Frank, Elke Gizewski, Gregor Broessner
To demonstrate the importance of calibration measurements in 3 Tesla proton magnetic resonance (MR) spectroscopy (1 H-MRS) thermometry for human brain temperature estimation for routine clinical applications. In vitro proton MR spectroscopy to obtain calibration constants of the water-chemical shift was conducted at 3 Tesla with a temperature-controlled phantom, containing a pH-buffered aqueous solution of N-acetyl aspartate (NAA), creatine (Cr), methylene protons of Cr (Cr2), dimethyl silapentane sulfonic acid (DSS), and sodium formate (NaFor)...
November 20, 2018: Therapeutic Hypothermia and Temperature Management
Chan Wang, Tantan Hu, Tiju Thomas, Shanliang Song, Zhuoqi Wen, Chuanxi Wang, Qijun Song, Minghui Yang
Fluorescence-based nanothermometers have potential to offer accuracy in the measurement of temperature using non-contact approaches. Herein, a C-dot/C-dot based dual-emission temperature sensing platform is fabricated through the electrostatic self-assembly of two kinds of fluorescent CDs with opposite charges. This dual-emission platform consists of several nearly-spherical CDs with two emission centers in blue (440 nm) and orange (590 nm) regions. The orange fluorescence exhibits discernible response to external temperatures in the range of ∼15 to 85 °C; on the other hand, the blue fluorescence remains nearly constant...
November 29, 2018: Nanoscale
Deborah Gates, Victoria Horner, Lindsey Bradley, Takeya Fogle Sheperd, Omena John, Melinda Higgins
BACKGROUND: Accurate temperature measurement in patients with cancer is critical. Many patients are neutropenic; therefore, fever represents an oncologic emergency, and, in many cases, it can be the only indication of a life-threatening infection. Although oral thermometers most closely represent true core temperature, patients may have barriers to oral thermometry. OBJECTIVES: The purpose of this study was to assess the accuracy of two alternative, noninvasive thermometers (tympanic and temporal artery) by comparing them to an oral thermometer...
December 1, 2018: Clinical Journal of Oncology Nursing
Stefano M Bernasconi, Inigo A Müller, Kristin D Bergmann, Sebastian F M Breitenbach, Alvaro Fernandez, David A Hodell, Madalina Jaggi, Anna Nele Meckler, Isabel Millan, Martin Ziegler
About a decade after its introduction, the field of carbonate clumped isotope thermometry is rapidly expanding because of the large number of possible applications and its potential to solve long-standing questions in Earth Sciences. Major factors limiting the application of this method are the very high analytical precision required for meaningful interpretations, the relatively complex sample preparation procedures, and the mass spectrometric corrections needed. In this paper we first briefly review the evolution of the analytical and standardization procedures and discuss the major remaining sources of uncertainty...
September 2018: Geochemistry, Geophysics, Geosystems: G³
Katie E Miles, Bryn Hubbard, Duncan J Quincey, Evan S Miles, Tenzing C Sherpa, Ann V Rowan, Samuel H Doyle
Runoff from high-elevation debris-covered glaciers represents a crucial water supply for millions of people in the Hindu Kush-Himalaya region, where peak water has already passed in places. Knowledge of glacier thermal regime is essential for predicting dynamic and geometric responses to mass balance change and determining subsurface drainage pathways, which ultimately influence proglacial discharge and hence downstream water availability. Yet, deep internal ice temperatures of these glaciers are unknown, making projections of their future response to climate change highly uncertain...
November 14, 2018: Scientific Reports
Paola Saccomandi, Alfonso Lapergola, Fabio Longo, Emiliano Schena, Giuseppe Quero
PURPOSE: Pancreatic cancer is a challenging malignancy with low treatment option and poor life expectancy. Thermal ablation techniques were proposed as alternative treatment options, especially in advanced stages and for unfit-for-surgery patients. This systematic review describes the thermal ablative techniques -i.e., Laser (LA), Radiofrequency (RFA), Microwave (MWA) Ablation, High-Intensity Focused Ultrasound (HIFU) and cryoablation- available for pancreatic cancer treatment. Additionally, an analysis of the efficacy, complication rate and overall survival for each technique is conducted...
November 14, 2018: International Journal of Hyperthermia
Emily L Keller, Hyunho Kang, Christy L Haynes, Renee R Frontiera
Plasmonic materials show great potential for selective photocatalysis under relatively mild reaction conditions. However, the catalytic activity of these plasmonic catalysts can also depend upon the support material that stabilizes the catalysts, where the composition of the catalytic support may change the overall photocatalytic efficiency and yield. It is unknown how changes in the support material may change the plasmon-driven photocatalysis, which may be initiated by plasmon-derived hot carriers, localized heating, or enhanced electromagnetic fields...
November 28, 2018: ACS Applied Materials & Interfaces
Can Li, Sen Yan, Weinan He, Sheng Yang, Jianfei Sun, Ning Gu
Cell inflammation process is reflected through real-time in situ cellular temperature changes. METHODS: A wireless thermometry system for in situ cellular temperature measurements was used in an incubator to detect the HMEC-1 cellular temperature under lipopolysaccharide inflammation production and norepinephrine for inflammation repair. Combining the changes in cell viability, inflammatory factor levels and ATP content caused by different lipopolysaccharide or norepinephrine doses, an obvious inflammatory response and repair effect was obtained...
November 12, 2018: IEEE Transactions on Bio-medical Engineering
Nikolai N Klimov, Zeeshan Ahmed
In recent years, a push for developing novel silicon photonic devices for telecommunications has generated a vast knowledge base that is now being leveraged for developing sophisticated photonic sensors. Silicon photonic sensors seek to exploit the strong confinement of light in nano-waveguides to transduce changes in physical state to changes in resonance frequency. In the case of thermometry, the thermo-optic coefficient, i.e., changes in refractive index due to temperature, causes the resonant frequency of the photonic device such as a Bragg grating to drift with temperature...
October 24, 2018: Journal of Visualized Experiments: JoVE
Tyler J Murphy, Kevin S Murnane
Anesthesia-Induced Hypothermia (AIH) has been reported to be the cause of many postoperative adverse effects, including increased mortality, decreased immune responses, cardiac events, and a greater prevalence of postoperative surgical wound infections. AIH can in some cases be minimized with pre-warming fluids and gases and forced-air heating systems, but such techniques are not always effective and can result in patient burns or other adverse effects. Stimulation of 5-HT2 receptors has been reported to increase body temperature through a variety of mechanisms, and as such, may be a viable target for pharmacologically minimizing AIH...
November 6, 2018: European Journal of Pharmacology
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