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https://www.readbyqxmd.com/read/28078195/using-voice-coils-to-actuate-modular-soft-robots-wormbot-an-example
#1
Markus P Nemitz, Pavel Mihaylov, Thomas W Barraclough, Dylan Ross, Adam A Stokes
In this study, we present a modular worm-like robot, which utilizes voice coils as a new paradigm in soft robot actuation. Drive electronics are incorporated into the actuators, providing a significant improvement in self-sufficiency when compared with existing soft robot actuation modes such as pneumatics or hydraulics. The body plan of this robot is inspired by the phylum Annelida and consists of three-dimensional printed voice coil actuators, which are connected by flexible silicone membranes. Each electromagnetic actuator engages with its neighbor to compress or extend the membrane of each segment, and the sequence in which they are actuated results in an earthworm-inspired peristaltic motion...
December 1, 2016: Soft Robotics
https://www.readbyqxmd.com/read/28069880/repair-of-a-bowel-containing-scrotal-hernia-with-incarceration-contributed-by-femorofemoral-bypass-graft
#2
Gaurav Sharma, Jonathan A Schouten, Kamal M F Itani
The rising use of endovascular techniques utilizing femoral artery access may increase the frequency with which surgeons face the challenge of hernia repair in reoperative groins-which may or may not include a vascular graft. We present a case where a vascular graft contributed to an acute presentation and complicated dissection, and review the literature. A 67-year-old man who had undergone prior endovascular aneurysm repair via open bilateral femoral artery access and concomitant prosthetic femorofemoral bypass, presented with an incarcerated, scrotal inguinal hernia...
January 8, 2017: Journal of Surgical Case Reports
https://www.readbyqxmd.com/read/28049434/why-does-a-cooled-object-feel-heavier-psychophysical-investigations-into-the-weber-s-phenomenon
#3
James S Dunn, David A Mahns, Saad S Nagi
BACKGROUND: It has long been known that a concomitantly cooled stimulus is perceived as heavier than the same object at a neutral temperature-termed Weber's Phenomenon (WP). In the current study, we re-examined this phenomenon using well-controlled force and temperature stimuli to explore the complex interplay between thermal and tactile systems, and the peripheral substrates contributing to these interactions. A feedback-controlled apparatus was constructed using a mechanical stimulator attached to a 5- × 5-mm thermode...
January 3, 2017: BMC Neuroscience
https://www.readbyqxmd.com/read/28047878/th-ab-209-06-an-investigation-of-the-feasibility-of-malignant-lesion-detection-during-routine-breast-cancer-screening-using-a-prototype-acousto-optic-transmission-ultrasound-imaging-system
#4
J R Rosenfield, J S Sandhu, P J La Riviere
PURPOSE: To investigate the feasibility of malignant lesion detection during routine breast cancer screening using an acousto-optic (AO) transmission ultrasound imaging system, particularly in premenopausal women with high breast density. METHODS: A full-field, single-projection ultrasound imaging system was developed that uses a high-resolution AO detector to convert the acoustic intensity transmitted through the compressed breast into a visual image by virtue of the AO effect in nematic liquid crystals...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047456/mo-de-207a-06-ecg-gated-ct-reconstruction-for-a-c-arm-inverse-geometry-x-ray-system
#5
J M Slagowski, Dap Dunkerley
PURPOSE: To obtain ECG-gated CT images from truncated projection data acquired with a C-arm based inverse geometry fluoroscopy system, for the purpose of cardiac chamber mapping in interventional procedures. METHODS: Scanning-beam digital x-ray (SBDX) is an inverse geometry fluoroscopy system with a scanned multisource x-ray tube and a photon-counting detector mounted to a C-arm. In the proposed method, SBDX short-scan rotational acquisition is performed followed by inverse geometry CT (IGCT) reconstruction and segmentation of contrast-enhanced objects...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046767/su-g-bra-08-diaphragm-motion-tracking-based-on-kv-cbct-projections-with-a-constrained-linear-regression-optimization
#6
J Wei, M Chao
PURPOSE: To develop a novel strategy to extract the respiratory motion of the thoracic diaphragm from kilovoltage cone beam computed tomography (CBCT) projections by a constrained linear regression optimization technique. METHODS: A parabolic function was identified as the geometric model and was employed to fit the shape of the diaphragm on the CBCT projections. The search was initialized by five manually placed seeds on a pre-selected projection image. Temporal redundancies, the enabling phenomenology in video compression and encoding techniques, inherent in the dynamic properties of the diaphragm motion together with the geometrical shape of the diaphragm boundary and the associated algebraic constraint that significantly reduced the searching space of viable parabolic parameters was integrated, which can be effectively optimized by a constrained linear regression approach on the subsequent projections...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28041324/frequency-of-symptomatic-vertebral-body-compression-fractures-requiring-intervention-following-single-fraction-stereotactic-radiosurgery-for-spinal-metastases
#7
Michael S Virk, James E Han, Anne S Reiner, Lily A McLaughlin, Daniel M Sciubba, Eric Lis, Yoshiya Yamada, Mark Bilsky, Ilya Laufer
OBJECTIVE The purpose of this study was to determine the rate of symptomatic vertebral body compression fractures (VCFs) requiring kyphoplasty or surgery in patients treated with 24-Gy single-fraction stereotactic radiosurgery (SRS). METHODS This retrospective analysis included all patients who had been treated with 24-Gy, single-fraction, image-guided intensity-modulated radiation therapy for histologically confirmed solid tumor metastases over an 8-year period (2005-2013) at Memorial Sloan Kettering Cancer Center...
January 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28039989/time-domain-characteristics-of-wave-motion-in-dispersive-and-anisotropic-continuum-acoustic-metamaterials
#8
Zhaojun Wang, Xiaoming Zhou
The authors study the wave propagation in continuum acoustic metamaterials whose all or not all of the principal elements of the mass tensor or the scalar compressibility can be negative due to wave dispersion. Their time-domain wave characteristics are particularly investigated by the finite-difference time-domain (FDTD) method, in which algorithms for the Drude and Lorentz dispersion pertinent to acoustic metamaterials are provided necessarily. Wave propagation nature of anisotropic acoustic metamaterials with all admissible material parameters are analyzed in a general manner...
December 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28038750/a-tracheal-scaffold-of-gelatin-chondroitin-sulfate-hyaluronan-polyvinyl-alcohol-with-orientated-porous-structure
#9
Xueping Yu, Guowen Qian, Si Chen, Dong Xu, Xiujuan Zhao, Chang Du
Scaffold of gelatin-chondroitin sulfate-hyaluronan-polyvinyl alcohol (GCH-PVA) with orientated microtubule structure and good hydrophilicity was fabricated by unidirectional freeze-drying method mimicking the composition and structure of tracheal cartilage extracellular matrix. PVA was incorporated to improve flexibility and viscoelasticity of GCH scaffold. All wet scaffolds showed similar compressive elastic modulus with native cartilage. GCH-PVA scaffolds showed high relative remaining stress during relaxation indicating good mechanical stability...
March 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28033626/-overview-and-introduction-of-a-treatment-concept-for-postoperative-care-and-mobilisation-after-free-flap-transplantation-in-the-lower-extremity
#10
M Cerny, J-T Schantz, H Erne, D Schmauss, R E Giunta, H-G Machens, T Schenck
Introduction: Free flap transplants for soft tissue reconstruction in the lower extremity are associated with a higher rate of complications compared with other areas. Mobilisation and the resulting hydrostatic pressure put strain on the flaps. In general, these effects are countered by slowly increasing hydrostatic pressure with the leg being compressed by elastic bandages. These postoperative regimes are also called dangling procedures or "flap training", but are not scientifically validated and therefore there is no consensus or guideline leading to a standard treatment regime...
December 2016: Handchirurgie, Mikrochirurgie, Plastische Chirurgie
https://www.readbyqxmd.com/read/28033533/fatigue-responses-of-the-human-cervical-spine-intervertebral-discs
#11
Narayan Yoganandan, Sagar Umale, Brain Stemper, Bryan Snyder
Numerous studies have been conducted since more than fifty years to understand the behavior of the human lumbar spine under fatigue loading. Applications have been largely driven by low back pain and human body vibration problems. The human neck also sustains fatigue loading in certain type of civilian occupational and military operational activities, and research is very limited in this area. Being a visco-elastic structure, it is important to determine the stress-relaxation properties of the human cervical spine intervertebral discs to enable accurate simulations of these structures in stress-analysis models...
December 15, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28018608/digenic-mutations-of-human-ocrl-paralogs-in-dent-s-disease-type-2-associated-with-chiari-i-malformation
#12
Daniel Duran, Sheng Chih Jin, Tyrone DeSpenza, Carol Nelson-Williams, Andrea G Cogal, Elizabeth W Abrash, Peter C Harris, John C Lieske, Serena Je Shimshak, Shrikant Mane, Kaya Bilguvar, Michael L DiLuna, Murat Günel, Richard P Lifton, Kristopher T Kahle
OCRL1 and its paralog INPP5B encode phosphatidylinositol 5-phosphatases that localize to the primary cilium and have roles in ciliogenesis. Mutations in OCRL1 cause the X-linked Dent disease type 2 (DD2; OMIM# 300555), characterized by low-molecular weight proteinuria, hypercalciuria, and the variable presence of cataracts, glaucoma and intellectual disability without structural brain anomalies. Disease-causing mutations in INPP5B have not been described in humans. Here, we report the case of an 11-year-old boy with short stature and an above-average IQ; severe proteinuria, hypercalciuria and osteopenia resulting in a vertebral compression fracture; and Chiari I malformation with cervico-thoracic syringohydromyelia requiring suboccipital decompression...
2016: Human Genome Variation
https://www.readbyqxmd.com/read/28018282/perceived-duration-increases-with-contrast-but-only-a-little
#13
Christopher P Benton, Annabelle S Redfern
Recent adaptation studies provide evidence for early visual areas playing a role in duration perception. One explanation for the pronounced duration compression commonly found with adaptation is that it reflects adaptation-driven stimulus-specific reduction in neural activity in early visual areas. If this level of stimulus-associated neural activity does drive duration, then we would expect a strong effect of contrast on perceived duration as electrophysiological studies shows neural activity in early visual areas to be strongly related to contrast...
2016: Frontiers in Psychology
https://www.readbyqxmd.com/read/28017771/synthesis-of-asymmetric-movement-trajectories-in-timed-rhythmic-behaviour-by-means-of-frequency-modulation
#14
Carl Haakon Waadeland
Results from different empirical investigations on gestural aspects of timed rhythmic movements indicate that the production of asymmetric movement trajectories is a feature that seems to be a common characteristic of various performances of repetitive rhythmic patterns. The behavioural or neural origin of these asymmetrical trajectories is, however, not identified. In the present study we outline a theoretical model that is capable of producing syntheses of asymmetric movement trajectories documented in empirical investigations by Balasubramaniam et al...
December 22, 2016: Human Movement Science
https://www.readbyqxmd.com/read/28017534/direct-motor-evoked-potentials-and-cortical-mapping-using-the-nim%C3%A2-nerve-monitoring-system-a-technical-note
#15
Suparna Bharadwaj, Faizal Haji, Matthew Hebb, Jason Chui
Motor evoked potentials (MEPs) are commonly used to prevent neurological injury when operating in close proximity to the motor cortex or corticospinal pathway. We report a novel application of the NIM® nerve monitoring system (Medtronic@ NIM response 3.0) for intraoperative direct cortical (dc)-MEPs monitoring. A 69-year-old female patient presented with a 4month history of progressive left hemiparesis resulting from a large right sided posterior frontal meningioma that abutted and compressed the motor cortex...
December 22, 2016: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28011339/assessment-of-accumulated-damage-in-circular-tubes-using-nonlinear-circumferential-guided-wave-approach-a-feasibility-study
#16
Mingxi Deng, Guangjian Gao, Yanxun Xiang, Mingliang Li
The feasibility of using the nonlinear effect of primary Circumferential Guided Wave (CGW) propagation for assessing accumulated damage in circular tubes has been investigated. For a given circular tube, an appropriate mode pair of fundamental and double frequency CGWs is chosen to enable that the second harmonic of the primary wave mode can accumulate along the circumferential direction. After the given circular tube is subjected to compression-compression repeated loading for different numbers of loading cycles, the corresponding ultrasonic measurements are conducted...
March 2017: Ultrasonics
https://www.readbyqxmd.com/read/28006054/cognitive-load-in-voice-therapy-carry-over-exercises
#17
Jenny Iwarsson, David Jackson Morris, Laura Winther Balling
Purpose: The cognitive load generated by online speech production may vary with the nature of the speech task. This article examines 3 speech tasks used in voice therapy carry-over exercises, in which a patient is required to adopt and automatize new voice behaviors, ultimately in daily spontaneous communication. Method: Twelve subjects produced speech in 3 conditions: rote speech (weekdays), sentences in a set form, and semispontaneous speech. Subjects simultaneously performed a secondary visual discrimination task for which response times were measured...
January 1, 2017: Journal of Speech, Language, and Hearing Research: JSLHR
https://www.readbyqxmd.com/read/28005848/broadband-microwave-photonic-phase-shifter-based-on-a-feedback-coupled-microring-resonator-with-small-radio-frequency-power-variations
#18
Jian Tang, Ming Li, Shuqian Sun, Zhiyong Li, Wei Li, Ninghua Zhu
An on-chip microwave photonic phase shifter based on an electrically tunable feedback-coupled microring resonator (FCMR) is proposed and experimentally demonstrated. By properly adjusting the voltage applied on the FCMR, the transmission spectrum with different optical extinction ratios is realized while the phase shift range remains almost unchanged. This proposal solves the conflict between the large range of phase shift and small radio frequency (RF) power variation in the ring-resonator-based microwave photonics phase shifter...
October 15, 2016: Optics Letters
https://www.readbyqxmd.com/read/28005806/hydatid-cyst-of-the-posterior-cervical-region
#19
Muhsin Nuh Aybay, Ibrahim Guler, Ozgur Oner, Suleyman Baktik, Ali Fuat Tekin
Hydatid cyst is an endemically seen parasitic disease and caused by the larval form of Echinococcus parasites. The disease is mostly seen in liver and lung, and the other involvement is rarely seen. Head and neck involvement is extremely rarely seen and its frequency in the literature is reported as less than 1%. It is usually asymptomatic and the symptoms are related to the compression to the adjacent structures. In this paper, the authors report a patient of hydatid cyst localized in the posterior cervical region...
November 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28004324/ct-characteristics-of-traumatic-sacral-fractures-in-association-with-pelvic-ring-injuries-correlation-using-the-young-burgess-classification-system
#20
Nicholas Beckmann, Chunyan Cai
PURPOSE: The purpose of the study is to determine the incidence of sacral fracture patterns on CT imaging of pelvic trauma patients with correlation with mechanism of injury and pelvic ring injury pattern using the Young-Burgess classification system. MATERIALS AND METHODS: This is a retrospective review of all pelvic CTs with pelvic fractures performed at our level 1 trauma center during a 4-year period from July 2010 to June 2014. RESULTS: Sacral fractures were very common in pelvic trauma patients, being present in 60% of patients presenting to our institution with pelvic fractures...
December 21, 2016: Emergency Radiology
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