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Li Zhu, Wei Tan, Zumao Peng, Mengya Deng, Xieguang Zhang, Guowu Yang
A rapid method was developed for the simultaneous determination of 15 nutrients containing eight vitamin E, six γ-oryzanols and β-carotene in rice by ultra high performance liquid chromatography-linear ion trap/orbitrap high resolution mass spectrometry (UHPLC-LTQ/Orbitrap HRMS). The analytes were extracted by methanol containing 0.05% (v/v) 2,6-di-tert-butyl-4-methylphenol (BHT) under the ultrasonic condition, then separated by a Poroshell 120 PFP column (150 mm×3.0 mm, 2.7 μm) with a gradient elution program using 0...
September 8, 2017: Se Pu, Chinese Journal of Chromatography
Ullah Habib, D Wilfred Cecilia, S Shaharun Maizatul
Ionic liquids (ILs) based ultrasonic-assisted extract has been applied for the extraction of essential oil from Persicaria minor leaves. The effects of temperature, sonication time, and particle size of the plant material on the yield of essential oil were investigated. Among the different ILs employed, 1-ethyl-3-methylimidazolium acetate was the most effective, providing a 9.55% yield of the essential oil under optimum conditions (70 ℃, 25 min, IL:hexane ratio of 7:10 (v/v), particle size 60-80 mesh). The performance of 1-ethyl-3-methylimidazolium acetate in the extraction was attributed to its low viscosity and ability to disintegrate the structural matrix of the plant material...
June 8, 2017: Se Pu, Chinese Journal of Chromatography
Zhen Wang, Zhiyu Xiao, Chuanshou Huang, Liping Wen, Weiwen Zhang
The present article studied the effect of ultrasonic surface rolling process (USRP) on the microstructure and wear behavior of a selective laser melted Ti-6Al-4V alloy. Surface characteristics were investigated using optical microscope, nano-indentation, scanning electron microscope, transmission electron microscope and laser scanning confocal microscope. Results indicated that the thickness of pore-free surfaces increased to 100~200 μm with the increasing ultrasonic surface rolling numbers. Severe work hardening occurred in the densified layer, resulting in the formation of refined grains, dislocation walls and deformation twins...
October 19, 2017: Materials
Wei Zhang, Guang'an Xiao, Shenfei Qin, Amanda B Reed-Maldonado, Jian Xu, Guanghua Chen, Lei Wang, Tie Zhou
BACKGROUND AND PURPOSE: Transurethral seminal vesiculoscopy (TSV) provides an efficient approach to diagnose and treat the hematospermia but still need further improvement in manipulation and corresponding instruments. In this study, we develop an innovative technique with ultrasonic lithotripter (EMS) to treat severe, persistent hematospermia. PATIENTS AND METHODS: Data of patients who underwent TSV with or without ultrasonic lithotripter between May 2012 and December 2015 was reviewed...
October 19, 2017: Journal of Endourology
Tingting Gang, Manli Hu, Yongxin Hao, Ruixiang Zhou, Rongxin Tong, Xueguang Qiao, Qiangzhou Rong
An integrated ultrasonic detection system that consists of emission and detection has been proposed and demonstrated experimentally. The proposed emission source is based on plastic optical fiber (POF). In order to promote the coupling of ultrasound-to-POF, and the end of the POF is heated to form a circular pedestal. A homemade fiber Fabry-Perot interferometer is employed to evaluate the coupling efficiency of ultrasound-to-POF. The sensing head is spliced with a short section of hollow-core fiber and single-mode fiber, resulting in an air microbubble formation by discharging...
August 20, 2017: Applied Optics
Junghyun Wee, Drew Hackney, Philip Bradford, Kara Peters
Fiber Bragg grating (FBG) sensors are typically spot-bonded onto the surface of a structure to detect ultrasonic waves in laboratory demonstrations. However, to protect the rest of the optical fiber from any environmental damage during real applications, bonding the entire length of fiber, called continuous bonding, is commonly done. In this paper, we investigate the impact of continuously bonding FBGs on the measured Lamb wave signal. In theory, the ultrasonic wave signal can bi-directionally transfer between the optical fiber and the plate at any adhered location, which could potentially produce output signal distortion for the continuous bonding case...
September 1, 2017: Applied Optics
Zheng Li, Shiling Yan, Qingnan Xie, Chenyin Ni, Zhonghua Shen
The ultrasonic bulk waves generated by a high-power continuous laser scanning along the surface of aluminum material were theoretically investigated. Although the temperature rise generated by this scanning laser irradiation was small, it provided a large temperature gradient, which was able to generate measurable ultrasonic waves. Detailed discussions were given to the influence of scanning speed on the generation propagation direction and the amplitude of the wavefront. The longitudinal and transverse waves would be generated in the material only when the scanning speeds reached a certain range...
May 20, 2017: Applied Optics
Jian Zhang, Sio Hang Pun, Yuanyu Yu, Duyang Gao, Jiujiang Wang, Peng Un Mak, Kin Fong Lei, Ching-Hsiang Cheng, Zhen Yuan
Photoacoustic tomography (PAT) as a hybrid technology combines the high optical contrast and high acoustic resolution in a single imaging modality. However, most of the available PAT systems cannot comprehensively or accurately characterize biological systems at multiple length scales due to the use of narrow bandwidth commercial ultrasonic transducers. In this study, we fabricated a novel multi-band capacitive micromachined ultrasonic transducer (CMUT) array, and first developed a CMUT-based multi-band photoacoustic tomography (MBPAT) imaging system...
May 10, 2017: Applied Optics
Christian Wong, Kasper Gosvig, Stig Sonne-Holm
BACKGROUND: Muscle imbalance has been suggested as implicated in the pathology of adolescent idiopathic scoliosis (AIS). The specific "pathomechanic" role of the paravertebral muscles as being scoliogenic (inducing scoliosis) or counteracting scoliosis in the initial development and maintenance of this spinal deformity has yet to be clarified in humans. In the present study, we investigated the radiographic changes of temporal paralysis using botulinum toxin A as localized injection therapy (ITB) in the psoas major muscle in AIS patients...
2017: Scoliosis and Spinal Disorders
Claudio Larosa, Niranjan Patra, Marco Salerno, Lara Mikac, Remo Merijs Meri, Mile Ivanda
A polymer nanocomposite was produced by ultrasonic-assisted dispersion of multiwalled carbon nanotubes (MWCNTs) in a polycarbonate matrix using p-xylene and dichloromethane as the solvents. The filler loading was varied from 1 to 3 wt % in order to examine the effect of MWCNTs on the structure and properties of the composites. The nanocomposites were characterized by DSC, DTA, TGA, UV-vis, FTIR and Raman spectroscopy to evaluate the changes induced by the filler in the polymer matrix. UV-vis, FTIR and Raman spectroscopy measurements confirmed the presence of the dispersed phase in the composite films, while TGA and DSC analysis of the nanocomposites revealed enhanced thermal stability and decreased crystallinity, respectively, as compared to the neat polymer...
2017: Beilstein Journal of Nanotechnology
Risa Aoki, Ryojun Toyoda, Julius Fritz Kögel, Ryota Sakamoto, Jatish Kumar, Yasutaka Kitagawa, Koji Harano, Tsuyoshi Kawai, Hiroshi Nishihara
One-dimensional (1D) coordination polymers (CPs) experiences severe limitations in exfoliation into individual strands, which hamper their utility as functional 1D nanomaterials. Here we demonstrate the synthesis of chiral 1D-CPs that feature the bis(dipyrrinato)zinc(II) complex motif. They can be exfoliated into single strands upon ultrasonication in organic media, retaining lengths of up to 3.19 μm (ca. 2600 monomer units). Their chiroptical structure allows the exfoliated wires to show circularly polarized luminescence at an intensity 5...
October 19, 2017: Journal of the American Chemical Society
Huizhong Jiang, Zhen Li, Ran Sun, Dachuan Liu, Ningpu Liu
PURPOSE: To assess changes in the thickness of the subfoveal retina and choroid after phacoemulsification using enhanced depth imaging optical coherence tomography (EDI-OCT). METHODS: A prospective study was conducted on 100 patients. The subfoveal choroidal thickness (SFCT) was measured at 7 points and the retinal thickness was measured at 5 points (before surgery, and 1 day, 1 week, 1 month, and 3 months after surgery). RESULTS: The foveal choroidal thickness showed a thickening trend (but p > 0...
October 19, 2017: Ophthalmic Research
Julie Boulanger-Bertolus, Millie Rincón-Cortés, Regina M Sullivan, Anne-Marie Mouly
Throughout life, rats emit ultrasonic vocalizations (USV) when confronted with an aversive situation. However, the conditions classically used to elicit USV vary greatly with the animal's age (isolation from the dam in infancy, versus nociceptive stimulation in adults). The present study is the first to characterize USV responses to the same aversive event throughout development. Specifically, infant, juvenile and adult rats were presented with mild foot-shocks and their USV frequency, duration, and relationship with respiration and behavior were compared...
October 18, 2017: Scientific Reports
Jie Xu, Feng Li, Fengling Chang
This paper aims to 137 cases of breast malignant tumors confirmed by surgery and pathology were collected. All patients received ultrasound examination and were not treated by radiotherapy or chemotherapy before operation. The preoperative ultrasound images of breast cancer patients and postoperative pathological characteristics of paraffin sections were retrospectively observed. Ultrasound indicators included tumor size, shape, ratio of the longest/shortest dimension, edge of the spiculation and peripheral hyperechoic halo sign, internal echo types, micro calcification, posterior echo types, blood flow and signs of lymph node metastasis...
July 2017: Pakistan Journal of Pharmaceutical Sciences
Alessandra De Gregorio, Emilio Pedrotti, Giulia Stevan, Margherita Montali, Simonetta Morselli
PURPOSE: To evaluate long-term efficacy and safety of repeated ultrasonic circular cyclocoagulation (UCCC) in patients with uncontrolled glaucoma. METHODS: Forty eyes of 40 patients affected by primary or secondary uncontrolled glaucoma under maximal tolerated medical therapy were enrolled in this prospective non-comparative case series study. A complete ophthalmic examination was performed before and after each month for 1 year. The UCCC treatment was repeated at 4 months if the intraocular pressure (IOP) was > 21 mmHg without major complications...
October 17, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
Saeed Nojavan, Mina Yazdanpanah
Water-insoluble β-cyclodextrin polymer was synthesized by chemical cross-linking using epichlorohydrin (EPI) as a cross-linker agent. The produced water-insoluble polymer was used as a sorbent for the micro-solid phase extraction (μ-SPE) of benzene, toluene, ethylbenzene and xylenes (BTEX) from water samples. The μ-SPE device consisted of a sealed tea bag envelope containing 15mg of sorbent. For the evaluation of the extraction efficiency, parameters such as extraction and desorption time, desorption solvent and salt concentration were investigated...
October 10, 2017: Journal of Chromatography. A
Zheng Xu, Hao Chen, Xu Yan, Menglu Qian, Qian Cheng
We investigated the use of the Schlieren method to calibrate the sound pressure in an ultrasonic standing-wave field. Specifically, we derived an equation to calculate the light intensity of the diffraction fringe induced by the standing-wave field. The results indicated that the sound pressure in the standing-wave field relates to the light intensity of the diffraction fringe. Simulations and experiments were conducted to verify the theoretical calculation. We demonstrated that the ratio of the light intensity of different diffraction orders relates to the sound pressure amplitude, allowing the pressure amplitude to be calibrated with the Schlieren method...
August 21, 2017: Optics Express
De Cai, Guangyao Li, Dongqing Xia, Zhongfei Li, Zhendong Guo, Sung-Liang Chen
Photoacoustic endoscopy (PAE) is a promising tool for the detection of atherosclerotic plaque. In this work, we propose a novel design of a side-viewing PAE probe based on a synthetic aperture focusing technique (SAFT) to enable high transverse resolution over large depth of focus (DOF) along the radial direction. A point-like ultrasonic detector is used to ensure a wide detection angle and thus a large synthetic aperture for SAFT. We first perform numerical simulation to optimize the PAE probe design, which involves the placement of the point-like detector and the diameter of a reflection rod mirror...
August 21, 2017: Optics Express
G A Cranch, L Johnson, M Algren, S Heerschap, G A Miller, T S Marunda, R L Holtz
Fiber laser ultrasonic sensors are demonstrated to be capable of measuring acoustic emission generated by cracks in aluminum panels. A single laser sensor is integrated into a riveted lap joint, which is subject to accelerated fatigue. Acoustic emission generated by crack formation in the panel in addition to other acoustic events due to fretting within the joint are clearly resolved by the laser sensor. Localization of an acoustic emission event is demonstrated with a multiplexed array of three laser sensors...
August 7, 2017: Optics Express
Shasha Chen, Zhi Zeng, Na Hu, Bo Bai, Honglun Wang, Yourui Suo
Lycium ruthenicum Murr. (LR) is a functional food that plays an important role in anti-oxidation due to its high level of phenolic compounds. This study aims to optimize ultrasound-assisted extraction (UAE) of phenolic compounds and antioxidant activities of obtained extracts from LR using response surface methodology (RSM). A four-factor-three-level Box-Behnken design (BBD) was employed to discuss the following extracting parameters: extraction time (X1), ultrasonic power (X2), solvent to sample ratio (X3) and solvent concentration (X4)...
March 1, 2018: Food Chemistry
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