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frequency compression

Hui Ye
Bone cells sense mechanical load, which is essential for bone growth and remodeling. In a fracture, this mechanism is compromised. Electromagnetic stimulation has been widely used to assist in bone healing, but the underlying mechanisms are largely unknown. A recent hypothesis suggests that electromagnetic stimulation could influence tissue biomechanics; however, a detailed quantitative understanding of EM-induced biomechanical changes in the bone is unavailable. This paper used a muscle/bone model to study the biomechanics of the bone under EM exposure...
March 19, 2018: Medical & Biological Engineering & Computing
Karthika Suresh, Dharmendar Kumar Sharma, Ramya Chulliyil, Ketan Dinkar Sarode, V Ravi Kumar, Arindam Chowdhury, Guruswamy Kumaraswamy
We use single particle tracking to investigate colloidal dynamics in hybrid assemblies comprising colloids enmeshed in a crosslinked polymer network. These assemblies are prepared using ice templating and are macroporous monolithic structures. We investigate microstructure-property relations in assemblies that appear chemically identical, but show qualitatively different mechanical response. Specifically, we contrast elastic assemblies that can recover from large compressive deformations with plastic assemblies that fail on being compressed...
March 20, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Gustavo S Oderich, Rodrigo Macedo, David H Stone, Edward Y Woo, Jean M Panneton, Timothy Resch, Nuno V Dias, Björn Sonesson, Marc L Schermerhorn, Jason T Lee, Manju Kalra, Randall R DeMartino, Giuliano de A Sandri, Emanuel J Ramos Tenorio
OBJECTIVE: Retrograde open mesenteric stenting (ROMS) through laparotomy was introduced as an alternative to surgical bypass in patients with acute mesenteric ischemia (AMI). The purpose of this study was to evaluate the indications and outcomes of ROMS for treatment of AMI and chronic mesenteric ischemia. METHODS: We reviewed the clinical data and outcomes of all consecutive patients treated by ROMS in seven academic centers from 2001 to 2013. ROMS was performed through laparotomy with retrograde access into the target mesenteric artery and stent placement using a retrograde or antegrade approach...
March 13, 2018: Journal of Vascular Surgery
Pei Huang, Yuanqing Li, Xiao-Guang Yu, Wei-Bin Zhu, Shu-Yan Nie, Hao Zhang, Jin-Rui Liu, Ning Hu, Shao-Yun Fu
The mimicry of human skin to detect both oncoming and physical-contacting object is of great importance in the fields of manufacturing, artificial robots and vehicles, etc. Herein, a novel bio-inspired flexible and highly responsive dual-mode strain/magnetism composite sensor which works via both contact and contactless modes, is first fabricated by incorporating Fe3O4/silicone system into a carbon fiber aerogel. The distance-dependence of magnetic field endorses the CFA/Fe3O4/silicone composite possible for spatial sensing due to the introduction of Fe3O4 magnetic nanoparticles...
March 15, 2018: ACS Applied Materials & Interfaces
T V Sachin Krishnan, Kento Yasuda, Ryuichi Okamoto, Shigeyuki Komura
We discuss thermal and active fluctuations of a compressible bilayer vesicle by using the results of hydrodynamic theory for vesicles. Coupled Langevin equations for the membrane deformation and the density fields are employed to calculate the power spectral density matrix of membrane fluctuations. Thermal contribution is obtained by means of the fluctuation dissipation theorem, whereas active contribution is calculated from exponentially decaying time correlation functions of active random forces. We obtain the total power spectral density as a sum of thermal and active contributions...
March 15, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Yoichi Takeuchi, Yoshie Ojima, Saeko Kagaya, Satoshi Aoki, Tasuku Nagasawa
BACKGROUND: Complications associated with diagnostic native percutaneous renal biopsy (PRB) must be minimized. While life threatening major complications has been extensively investigated, there is little discussion regarding minor bleeding complications, such as a transient hypotension, which directly affect patients' quality of life. There is also little evidence supporting the need for conventional manual compression following PRB. Therefore, this study evaluated the relationship between minor and major complications incidence in patients following PRB with or without compression...
March 14, 2018: Clinical and Experimental Nephrology
Shuyuan Zhu, Zhiying He, Xiandong Meng, Jiantao Zhou, Bing Zeng
Transform-domain downward conversion (TDDC) for image coding is usually implemented by discarding some high-frequency components from each transformed block. As a result, a block of fewer coefficients is formed, and a lower compression cost is achieved due to the coding of only a few low-frequency coefficients. In this paper, we focus on the design of a new TDDC-based coding method by using our proposed interpolation-compression directed filtering (ICDF) and error-compensated scalar quantization (ECSQ), leading to the compression-dependent TDDC (CDTDDC)-based coding...
June 2018: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
Ming-Sheng Tan, Yan-Lei Wang, Ying-Na Qi, Chun-Ke Dong, Wei Wang, Ping Yi, Feng Yang, Xiang-Sheng Tang, Qing-Ying Hao
OBJECTIVE: To explore the effect and underlying mechanism of decompression(DE)combined with Governor Vessel(GV)electro-acupuncture(EA) on rats with acute severe upper cervical spinal cord compression injury. METHODS: Thirty SPF rats were randomly divided into 5 groups(control group A, B and experiment group C, D, E), 6 rats in each group. The model of acute severe upper cervical spinal cord compression injury were made by forcing a balloon catheter put in atlas pillow clearance...
January 25, 2018: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
Diren Arsoy, Nicholas J Giori, Steven T Woolson
BACKGROUND: The use of chemoprophylaxis to prevent thromboembolic disease after primary THA and TKA can be associated with postoperative bleeding complications. Mechanical prophylaxis has been studied as an alternative to chemoprophylaxis with greater safety in patients undergoing THA, but no data have been published comparing the safety of chemoprophylaxis versus mechanical methods for patients undergoing TKA. The risk of readmission resulting from bleeding and venous thromboembolism (VTE) has also not been determined for patients undergoing THA or TKA when treated with low-molecular-weight heparin (LMWH) alone compared with mechanical prophylaxis plus aspirin (ASA)...
February 2018: Clinical Orthopaedics and related Research
Shaoteng Wu, Liancheng Wang, Zhiqiang Liu, Xiaoyan Yi, Yang Huang, Chao Yang, Tongbo Wei, Jianchang Yan, Guodong Yuan, Junxi Wang, Jinmin Li
Recently, horizontal nanowires (NWs) have attracted much attention due to their increased compatibility with NW-based integrated nanoelectronic and nanophotonic systems. However, it still remains challenging to synthesize horizontal NWs efficiently. Here we introduce a novel method towards controllable growth of horizontal GaN NWs using HVPE with an Au/Ni thin film as the catalyst. By simply flipping the substrate, horizontal GaN NWs with various growth directions and cross sections have been obtained on a sapphire substrate with various facet orientations...
March 9, 2018: Nanoscale
Min Wu, Xianming Fu, Ying Ji, Wanhai Ding, Dali Deng, Yehan Wang, Xiaofeng Jiang, Chaoshi Niu
BACKGROUND: Microvascular decompression (MVD) of the trigeminal nerve is the most effective treatment for trigeminal neuralgia (TN). However, when encountering with classical trigeminal neuralgia caused by venous compression, the procedure becomes much more difficult, and failure or recurrence due to incomplete decompression may become frequent. This study aimed to investigate the anatomical variation of the culprit veins, and discuss the surgical strategy for different types respectively...
March 3, 2018: World Neurosurgery
Cosimo Durante, Giorgio Grani, Livia Lamartina, Sebastiano Filetti, Susan J Mandel, David S Cooper
Importance: Thyroid nodules are common, being detected in up to 65% of the general population. This is likely due to the increased use of diagnostic imaging for purposes unrelated to the thyroid. Most thyroid nodules are benign, clinically insignificant, and safely managed with a surveillance program. The main goal of initial and long-term follow-up is identification of the small subgroup of nodules that harbor a clinically significant cancer (≈10%), cause compressive symptoms (≈5%), or progress to functional disease (≈5%)...
March 6, 2018: JAMA: the Journal of the American Medical Association
Colas Schretter, Shaun Bundervoet, David Blinder, Ann Dooms, Jan D'hooge, Peter Schelkens
Upcoming phased-array 2-D sensors will soon enable fast high-definition 3-D ultrasound imaging. Currently, the communication of raw radio-frequency (RF) channel data from the probe to the computer for digital beamforming is a bottleneck. For reducing the amount of transferred data samples, this paper investigates the design of an adapted sparse sampling technique for image reconstruction inspired by the compressed sensing framework. Echo responses from isolated points are generated using a physically based simulation of ultrasound wave propagation through tissues...
March 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Taku Inada, Sei Nishida, Taigo Kawaoka, Toshiyuki Takahashi, Junya Hanakita
Study Design: A retrospective study. Purpose: Our objectives were to determine the association between the pathological changes of disc herniation and the interval between primary and revision surgeries and to investigate the frequency and site of the dural laceration in the primary and revision surgeries. Overview of Literature: Among 382 patients who underwent microsurgical lumbar discectomy, we investigated 29 who underwent revision surgery to analyze recurrent herniation pathologies and complications to determine the manner in which lumbar disc herniation can be more efficiently managed...
February 2018: Asian Spine Journal
Sunghoon Choi, Haenghwa Lee, Donghoon Lee, Seungyeon Choi, Chang-Lae Lee, Woocheol Kwon, Jungwook Shin, Chang-Woo Seo, Hee-Joung Kim
PURPOSE: This work describes the hardware and software developments of a prototype chest digital tomosynthesis (CDT) R/F system. The purpose of this study is to validate the developed system for its possible clinical application on low-dose chest tomosynthesis imaging. METHODS: The prototype CDT R/F system was operated by carefully controlling the electromechanical subsystems through a synchronized interface. Once a command signal was delivered by the user, a tomosynthesis sweep started to acquire 81 projection views (PVs) in a limited angular range of ±20°...
March 3, 2018: Medical Physics
Junkai Zhang, Lili Yang, Xiaoxin Wu, Maobin Wei, Yanqing Liu, Chunxiao Gao, Jinghai Yang, Yanzhang Ma
Fe3+ doped chrysotile nanotubes (NTs) have been synthesized under controlled hydrothermal conditions, and have been characteristic of layered-walls and room-temperature ferromagnetism. High-pressure in-situ impedance spectra and synchrotron XRD measurements are performed on Fe-doped chrysotile NTs to reveal the electrical transport and structural properties under compression. Sample resistance (Rsum) was found to increase with the pressure elevation, accompanying the step decrease in the grain boundary relaxation frequency (fgb), which reflects the bandgap broadening and dipoles polarization weakening due to the application of pressure...
March 2, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Zheng Yu, Hua Y Geng, Y Sun, Y Chen
The metal-semiconductor-metal transition in dense lithium is considered as an archetype of interplay between interstitial electron localization and delocalization induced by compression, which leads to exotic electride phases. In this work, the dynamic dielectric response and optical properties of the high-pressure electride phases of cI16, oC40 and oC24 in lithium spanning a wide pressure range from 40 to 200 GPa by first-principles calculations are reported. Both interband and intraband contribution to the dielectric function are deliberately treated with the linear response theory...
March 1, 2018: Scientific Reports
Arif Hussain, Candice Yong, Katherine H R Tkaczuk, Yi Qian, Jorge Arellano, C Daniel Mullins, Eberechukwu Onukwugha
OBJECTIVE: Real-world data regarding patient factors associated with the occurrence of spinal cord compression (SCC) or pathological fracture (PF), or need for bone surgery (BS), or use of radiation therapy (RAD) (i.e. skeletal complications and radiation therapy; SCRT) are limited for women with metastatic breast cancer (BCa). Given the substantial clinical and economic burden of these events in advanced BCa, we conducted the present study to understand the prevalence and identify the risk factors associated with these events among elderly women presenting with de novo metastatic BCa...
2018: PloS One
Jan Vollert, Walter Magerl, Ralf Baron, Andreas Binder, Elena K Enax-Krumova, Gerd Geisslinger, Janne Gierthmühlen, Florian Henrich, Philipp Hüllemann, Thomas Klein, Jörn Lötsch, Christoph Maier, Bruno Oertel, Sigrid Schuh-Hofer, Thomas R Tölle, Rolf-Detlef Treede
As an indirect approach to relate previously identified sensory phenotypes of patients suffering from peripheral neuropathic pain to underlying mechanisms, we used a published sorting algorithm to estimate the prevalence of denervation, peripheral and central sensitization in 657 healthy subjects undergoing experimental models of nerve block (compression block, topical lidocaine), primary (sunburn, topical capsaicin), or secondary hyperalgesia (intradermal capsaicin, electrical high-frequency stimulation), and in 902 patients suffering from neuropathic pain...
February 24, 2018: Pain
Christopher Hernandez, Lenitza Nieves, Al C de Leon, Rigoberto Advincula, Agata A Exner
Shell-stabilized gas nanobubbles have recently captured the interest of the research community for their potential application as ultrasound contrast agents for molecular imaging and therapy of cancer. However, the very existence of sub-micron gas bubbles (especially uncoated bubbles) has been a subject of controversy in part due to their predicted Laplace overpressure reaching several atmospheres, making them supposedly thermodynamically unstable. In addition, the backscatter resulting from ultrasound interaction with nanoparticles should not be readily detectable at clinically-relevant frequencies...
March 1, 2018: ACS Applied Materials & Interfaces
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