keyword
MENU ▼
Read by QxMD icon Read
search

strontium

keyword
https://www.readbyqxmd.com/read/27914093/lsmo-nanoparticles-coated-by-hyaluronic-acid-for-magnetic-hyperthermia
#1
Yuanwei Chen, Ying Wang, Xi Liu, Mai Lu, Jiangwei Cao, Tao Wang
Magnetic hyperthermia with the treating temperature range of 41-46 °C is an alternative therapy for cancer treatment. In this article, lanthanum strontium manganates (La1-x Sr x MnO3, 0.25 ≤ × ≤ 0.35) magnetic nanoparticles coated by hyaluronic acid (HA) which possesses the ability of targeting tumor cells were prepared by a simple hydrothermal method combined with a high-energy ball milling technique. The crystal structure, morphology, magnetic properties of the HA-coated magnetic nanoparticles (MNPs), and their heating ability under alternating magnetic field were investigated...
December 2016: Nanoscale Research Letters
https://www.readbyqxmd.com/read/27913334/switchable-and-tunable-baw-duplexer-based-on-ferroelectric-material
#2
Almonir Abdulgader Mansour, Thottam S Kalkur
A switchable and tunable bulk acoustic wave (BAW) duplexer for RF applications is presented in this paper. The fabricated BAW duplexer was built on sapphire substrate using solidly mounted resonators. A metal-organic solution deposition technique was used to form resonators with barium strontium titanate (BST) thin film and six layers of silicon dioxide and tantalum oxide as Bragg reflector. By applying dc bias, the BST thin film shows an electrostrictive effect, and the two filter paths of the BAW duplexer switch to a bandpass response with center frequencies at 4...
December 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27908253/assessment-of-bone-quality-in-osteoporosis-treatment-with-bone-anabolic-agents-really-something-new
#3
Fabio Massimo Ulivieri, Renata Caudarella, Marzia Camisasca, Daniela Maria Cabrini, Ilaria Merli, Carmelo Messina, Luca Petruccio Piodi
Osteoporosis is a chronic pathologic condition, particularly of the elderly, in which a reduction of bone mineral density (BMD) weakens bone, leading to the so-called fragility fractures, most often of spine and femur. The gold standard exam for the quantitative measurement of BMD is the dual X-ray photon absorptiometry (DXA), a radiological method. However, a relevant number of fragility fractures occurs in the range of normal BMD values, meaning that also qualitative aspects of bone play a role, namely bone architecture and bone geometry...
December 1, 2016: Current Rheumatology Reviews
https://www.readbyqxmd.com/read/27905597/mechanism-for-the-enhanced-oxygen-reduction-reaction-of-la0-6sr0-4co0-2fe0-8o3-%C3%AE-by-strontium-carbonate
#4
Mei Li, Zhongti Sun, Wenqiang Yang, Tao Hong, Zhesheng Zhu, Yanxiang Zhang, Xiaojun Wu, Changrong Xia
Strontium doped lanthanum cobalt ferrite (LSCF) is a widely applied electrocatalyst for the oxygen reduction reaction (ORR) in solid-oxide fuel cells (SOFCs) operated at intermediate temperatures. Sr surface segregation in long-term operation has been reported to have contradicting effects that either degrade or improve the reaction. Thus, it is critical to understand the mechanism of surface Sr compounds on ORR kinetics. This work aims to verify the effect and propose the mechanism by decorating SrCO3 nanoparticles using the infiltration method...
December 1, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27899269/pixe-study-on-the-effects-of-parathyroid-hormone-on-elemental-content-in-rat-bones
#5
M H Eisa, H Shen, W Jin, Abdulaziz S Alaamer, M A Al-Rajhi, Hajo Idriss
Parathyroid hormone (PTH) has attracted considerable interest as a bone anabolic agent. PTH plays a central role in regulating calcium phosphate metabolism and its increases in production in response to low serum calcium levels. A continuous hypersecretion of PTH, as occurs in primary hyperparathyroidism, leads to bone resorption. In this study, the effect of different doses of parathyroid hormone (PTH) on bone mineral content (BMC) in rats was investigated by particle-induced X-ray emission (PIXE). This study will help in investigating further the toxicity of extremely high doses of PTH on BMC...
November 26, 2016: Physica Medica: PM
https://www.readbyqxmd.com/read/27897284/ytterbium-erbium-ion-doped-strontium-molybdate-srmoo4-synthesis-characterization-photophysical-properties-and-application-in-solar-cells
#6
Weifu Sun, Zihan Chen, Junli Zhou, Dongyu Li, Zhen Huang, Xiao Jin, Qin Zhang, Feng Li, Qinghua Li
In this work, ytterbium-erbium co-doped strontium molybdate (SrMoO4, SMO) nanophosphors (NPs), denoted as SMO:Yb/Er, have been successfully prepared. These NPs were then incorporated into TiO2 acceptor films in hybrid solar cells to enhance light harvesting by virtue of an up-conversion process where low energy photons can be converted into high energy photons through multi-photon processes. The results showed that the SMO:Yb/Er single crystal NPs are capable of turning near infrared photons into visible ones that can be easily captured by poly(thieno[3,4-b]-thiophene/benzodithiophene) (PTB7)...
November 29, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27894051/the-influence-of-sr-on-the-microstructure-degradation-and-stress-corrosion-cracking-of-the-mg-alloys-zk40xsr
#7
Lianxi Chen, Yuanhong Bin, Wenqi Zou, Xiaojian Wang, Wei Li
In the present work, new magnesium (Mg) alloys (Mg-4Zn-0.6Zr-xSr, x=0, 0.4, 0.8, 1.2, 1.6wt%; ZK40xSr) were prepared and studied as potential biodegradable materials. The influence of strontium (Sr) addition on the properties of the new Mg alloys was investigated, which included microstructure, corrosion degradation, and the stress corrosion cracking (SCC) susceptibility. The average grain size of the ZK40Sr was approximately 100µm, which was significantly smaller than that of ZK40 alloy without Sr (402.3±40...
November 18, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/27875745/water-as-probe-molecule-for-midgap-states-in-nanocrystalline-strontium-titanate-by-conventional-and-synchronous-luminescence-spectroscopy-under-ambient-conditions
#8
Sean Taylor, Alexander Samokhvalov
Alkaline earth metal titanates are broad bandgap semiconductors with applications in electronic devices, as catalysts, photocatalysts, sorbents, and sensors. Strontium titanate SrTiO3 is of interest in electronic devices, sensors, in the photocatalytic hydrogen generation, as catalyst and sorbent. Both photocatalysis and operation of electronic devices rely upon the pathways of relaxation of excited charge in the semiconductor, including relaxation through the midgap states. We report characterization of nanocrystalline SrTiO3 at room temperature by "conventional" vs...
November 13, 2016: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/27875220/high-quality-factor-low-temperature-dependency-smr-fbar-based-on-bst-using-mod-deposition-method
#9
Almonir Mansour, Thottam Kalkur
This paper presents the design, fabrication and experimental evaluation of switchable and tunable thin film bulk acoustic wave (BAW) resonators and filters with MOSD deposited BST for radio frequency (RF) applications. The switchability and tunability of these devices come from utilizing the electrostrictive effect of ferroelectric materials such as barium strontium titanate (BST) with the application of an external dc bias voltage. The BAW resonators and filters in this paper were fabricated on high resistivity silicon substrate as solidly mounted resonator (SMR) structure with eight layers of silicon dioxide and tantalum oxide as a Bragg reflector...
November 18, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27875020/linking-otolith-microchemistry-and-dendritic-isoscapes-to-map-heterogeneous-production-of-fish-across-river-basins
#10
Sean R Brennan, Daniel E Schindler
Production patterns of highly mobile species, such as anadromous fish, often exhibit high spatial and temporal heterogeneity across landscapes. Such variability is often asynchronous in time among habitats, which stabilizes production at aggregate scales of complexity. Reconstructing production patterns explicitly in space and time across multiple scales, however, remains difficult but is important for prioritizing habitat conservation. This is especially true for fishes inhabiting river basins due to long-range dispersal, high mortality at early life stages, complex population structure and elusive life history variation...
November 22, 2016: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/27867978/osteoporosis-and-strontium-substituted-hydroxyapatites
#11
EDITORIAL
Nikolaos Kourkoumelis
No abstract text is available yet for this article.
October 2016: Annals of Translational Medicine
https://www.readbyqxmd.com/read/27867109/towards-long-lasting-zirconia-based-composites-for-dental-implants-transformation-induced-plasticity-and-its-consequence-on-ceramic-reliability
#12
Helen Reveron, Marta Fornabaio, Paola Palmero, Tobias Fürderer, Erik Adolfsson, Vanni Lughi, Alois Bonifacio, Valter Sergo, Laura Montanaro, Jérôme Chevalier
: Zirconia-based composites were developed through an innovative processing route able to tune compositional and microstructural features very precisely. Fully-dense ceria-stabilized zirconia ceramics (84vol% Ce-TZP) containing equiaxed alumina (8vol%Al2O3) and elongated strontium hexa-aluminate (8vol% SrAl12O19) second phases were obtained by conventional sintering. This work deals with the effect of the zirconia stabilization degree (CeO2 in the range 10.0-11.5 mol%) on the transformability and mechanical properties of Ce-TZP-Al2O3-SrAl12O19 materials...
November 17, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27860352/impact-of-oxygen-deficiency-on-electrochemical-performance-of-k2nif4-type-la1-xsrx-2nio4-%C3%AE-oxygen-electrodes
#13
Ekaterina Kravchenko, Kiryl Zakharchuk, Alexander Viskup, Jekabs Grins, Gunnar Svensson, Vladimir Pankov, Aleksey A Yaremchenko
Perovskite-related (La1-xSrx)2NiO4-δ (x = 0.5-0.8) phases were explored for possible use as oxygen electrodes of solid electrolyte cells, with major focus on the effect of oxygen deficiency on electrocatalytic activity. (La1-xSrx)2NiO4-δ solid solutions were demonstrated to preserve the K2NiF4-type tetragonal structure under oxidizing conditions. Acceptor-type substitution by strontium is compensated by formation of oxygen vacancies and electron-holes and progressively increases high-temperature oxygen nonstoichiometry which reaches as high as δ = 0...
November 14, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27860100/improved-radio-frequency-magneto-optical-trap-of-srf-molecules
#14
Matthew H Steinecker, Daniel J McCarron, Yuqi Zhu, David DeMille
We report the production of ultracold, trapped strontium monofluoride (SrF) molecules with number density and phase-space density significantly higher than previously achieved. These improvements are enabled by three distinct changes to our recently-demonstrated scheme for radio-frequency magneto-optical trapping of SrF: modification of the slowing laser beam geometry, addition of an optical pumping laser, and incorporation of a compression stage to the magneto-optical trap. With these improvements, we observe a trapped sample of SrF molecules at density 2...
November 8, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/27859756/3d-imaging-of-ferroelectric-kinetics-during-electrically-driven-switching
#15
Mousa Ayoub, Hannes Futterlieb, Jörg Imbrock, Cornelia Denz
Čerenkov-type second-harmonic generation microscopy is used for in situ 3D imaging of the switching process of ferroelectric domains in a relaxor-type ferroelectric crystal. The lateral and longitudinal domain wall motion is optically measured and compared with the hysteresis loop to reveal the connection between the domain kinetics and the ferroelectric aging effect in strontium barium niobate.
November 11, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27857214/laser-controlled-atom-source-for-optical-clocks
#16
Ole Kock, Wei He, Dariusz Świerad, Lyndsie Smith, Joshua Hughes, Kai Bongs, Yeshpal Singh
Precision timekeeping has been a driving force in innovation, from defining agricultural seasons to atomic clocks enabling satellite navigation, broadband communication and high-speed trading. We are on the verge of a revolution in atomic timekeeping, where optical clocks promise an over thousand-fold improvement in stability and accuracy. However, complex setups and sensitivity to thermal radiation pose limitations to progress. Here we report on an atom source for a strontium optical lattice clock which circumvents these limitations...
November 18, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27847746/elemental-analysis-of-caries-affected-root-dentin-and-artificially-demineralized-dentin
#17
Young-Hye Sung, Ho-Hyun Son, Keewook Yi, Juhea Chang
OBJECTIVES: This study aimed to analyze the mineral composition of naturally- and artificially-produced caries-affected root dentin and to determine the elemental incorporation of resin-modified glass ionomer (RMGI) into the demineralized dentin. MATERIALS AND METHODS: Box-formed cavities were prepared on buccal and lingual root surfaces of sound human premolars (n = 15). One cavity was exposed to a microbial caries model using a strain of Streptococcus mutans. The other cavity was subjected to a chemical model under pH cycling...
November 2016: Restorative Dentistry & Endodontics
https://www.readbyqxmd.com/read/27844043/geostatistical-analysis-of-trace-elements-pxrf-dataset-of-near-surface-semi-arid-soils-from-central-botswana
#18
Peter N Eze, Valiant S Mosokomani, Theophilus K Udeigwe, Opeoluwa F Oyedele, Adeniyi F Fagbamigbe
Geospatial dataset of trace elements including manganese (Mn), iron (Fe), titanium (Ti), rubidium (Rb), strontium (Sr), thorium (Th), Vanadium (V) and Zirconium (Zr) of near-surface soils in a Cu-Ni prospecting field at Airstrip North, Central Botswana were statistically analysed. Grid sampling method was used in the field data collection. The relatively new portable X-ray fluorescence spectrometer (Delta Premium, 510890, USA) technology in a "soil" mode was used to measure the concentrations of trace elements in the soils...
December 2016: Data in Brief
https://www.readbyqxmd.com/read/27829691/simulating-the-transfer-of-strontium-90-from-soil-to-leafy-vegetables-by-using-strontium-88
#19
Ding Kuke, Liu Shujuan, He Yingxue, Yan Dong, Zhang Fengshou, Wang Shuifeng, Guo Jinghua, Zhang Wei, Wang Xin, Jiang Xiaoyan
The transfer, from soil to Chinese cabbage and spinach, of radioactive strontium-90 released as a result of accidents in nuclear power stations was studied using a stable isotope of strontium, namely nuclide strontium-88 ((88)Sr). The study led to an experimental model for assessing the hazard of radionuclide strontium-90 ((90)Sr) entering the food chain and for predicting the risk to food safety. Chinese cabbage and spinach were grown in pots in a greenhouse and irrigated with deionized water containing known quantities of strontium...
2016: Water, Air, and Soil Pollution
https://www.readbyqxmd.com/read/27814542/predictors-of-pesticide-concentrations-in-freshwater-trout-the-role-of-life-history
#20
Rachel C Scholes, Kimberly J Hageman, Gerard P Closs, Claudine H Stirling, Malcolm R Reid, Rasmus Gabrielsson, Jason M Augspurger
Concentrations of halogenated pesticides in freshwater fish can be affected by age, size, trophic position, and exposure history. Exposure history may vary for individual fish caught at a single location due to different life histories, e.g. they may have hatched in different tributaries before migrating to a specific lake. We evaluated correlations of pesticide concentrations in freshwater brown trout (Salmo trutta) from the Clutha River, New Zealand, with potential predictors including capture site, age, length, trophic level, and life history...
October 28, 2016: Environmental Pollution
keyword
keyword
59286
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"