oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 9 )

2019 ( 473 )

2018 ( 925 )

2017 ( 887 )

Custom range...

Search Results: 1 - 10 of 347867 matches for " S. He "
All listed articles are free for downloading (OA Articles)
Page 1 /347867
Display every page Item
Management and surgical treatment of parathyroid crisis secondary to parathyroid tumors: report of four cases
Ameerudden S, He X
International Medical Case Reports Journal , 2011, DOI: http://dx.doi.org/10.2147/IMCRJ.S23764
Abstract: nagement and surgical treatment of parathyroid crisis secondary to parathyroid tumors: report of four cases Case report (3794) Total Article Views Authors: Ameerudden S, He X Published Date August 2011 Volume 2011:4 Pages 59 - 66 DOI: http://dx.doi.org/10.2147/IMCRJ.S23764 Shakil Ameerudden, Xianghui He Department of General Surgery, Tianjin Medical University General Hospital, Tianjin, China Abstract: Parathyroid crisis, also known as a parathyroid storm, is a rare and serious complication of primary hyperparathyroidism. Four cases are reported here in which patients presented to hospital with general complaints due to hypercalcemia secondary to hyperparathyroidism. Blood test results upon admission showed high levels of serum calcium and parathyroid hormone, and medical treatment initiated to lower the calcium level was ineffective. After relevant investigations, each patient underwent surgical exploration of the parathyroid glands, followed by excision of a pathological parathyroid tumor. There was a prompt decrease in parathyroid hormone level immediately after surgery. Histology reports revealed that patients had parathyroid adenoma. All patients recovered after surgery, with serum calcium levels restored back to normal and with resolution of all symptoms of hypercalcemia. This report illustrates how often this disease is initially misdiagnosed, and how prompt appropriate surgical treatment provides the best outcome for the patient.
Management and surgical treatment of parathyroid crisis secondary to parathyroid tumors: report of four cases
Ameerudden S,He X
International Medical Case Reports Journal , 2011,
Abstract: Shakil Ameerudden, Xianghui HeDepartment of General Surgery, Tianjin Medical University General Hospital, Tianjin, ChinaAbstract: Parathyroid crisis, also known as a parathyroid storm, is a rare and serious complication of primary hyperparathyroidism. Four cases are reported here in which patients presented to hospital with general complaints due to hypercalcemia secondary to hyperparathyroidism. Blood test results upon admission showed high levels of serum calcium and parathyroid hormone, and medical treatment initiated to lower the calcium level was ineffective. After relevant investigations, each patient underwent surgical exploration of the parathyroid glands, followed by excision of a pathological parathyroid tumor. There was a prompt decrease in parathyroid hormone level immediately after surgery. Histology reports revealed that patients had parathyroid adenoma. All patients recovered after surgery, with serum calcium levels restored back to normal and with resolution of all symptoms of hypercalcemia. This report illustrates how often this disease is initially misdiagnosed, and how prompt appropriate surgical treatment provides the best outcome for the patient.Keywords: parathyroid crisis, hypercalcemia, hyperparathyroidism, hypercalcemic crisis, parathyroid adenoma
Maturation of neurotransmission in the developing rat cochlea: immunohistochemical evidence from differential expression of synaptophysin and synaptobrevin 2
S. He,J. Yang
European Journal of Histochemistry , 2011, DOI: 10.4081/ejh.2011.e2
Abstract: Synaptophysin and synaptobrevin 2 associate closely with packaging and storage of synaptic vesicles and transmitter release, and both play important roles in the development of rat cochlea. We examined the differential expression of synaptophysin and synaptobrevin 2 in the developing Sprague-Dawley rat cochlea, and investigated the relationship between their expression and auditory development. The expression of synaptophysin and synaptobrevin 2 was not observed in Kolliker’s and Corti’s organ at postnatal 1 day (P1) and P5, and the top turn of the cochlea at P10. Expression was detected in the outer spiral bundle (OSB), the inner spiral bundle (ISB), and the medial wall of the Deiters’ cell of the cochlea at P14, and P28, and in the middle or the basal turn of Corti’s organ at P10. Synaptobrevin 2 was expressed in the top of the inner hair cells (IHCs) in Corti’s organ of both P14 and P28 rats. All spiral ganglion neurons (SGNs) were stained at all ages examined. The localization of synaptophysin and synaptobrevin 2 in the cochlea was closely associated with the distribution of nerve fibers and neural activity (the docking and release of synaptic vesicles). Synaptophysin and synaptobrevin 2 were expressed in a dynamic manner during the development of rat cochlea. Their expression differences during the development were in favor of the configuration course constructed between nerve endings and target cells. It also played a key role in the formation of the correct coding of auditory information during auditory system development.
A concentrator for static magnetic field
F. Sun,S. He
Physics , 2013, DOI: 10.2528/PIER13012802
Abstract: We propose a compact passive device as a super-concentrator to create an extremely high uniform static magnetic field over 50T in a large two-dimensional free space from a weak background magnetic field. Such an amazing thing becomes possible for the first time, thanks to space-folded transformation and metamaterials for static magnetic fields. Finite element method (FEM) is utilized to verify the performance of the proposed device.
Transforming magnets
F. Sun,S. He
Physics , 2014, DOI: 10.1038/srep06593
Abstract: Based on the form-invariant of Maxwell's equations under coordinate transformations, we extend the theory of transformation optics to transformation magneto-statics, which can design magnets through coordinate transformations. Some novel DC magnetic field illusions created by magnets (e.g. shirking magnets, cancelling magnets and overlapping magnets) are designed and verified by numerical simulations. Our research will open a new door to designing magnets and controlling DC magnetic fields.
Extending the scanning angle of a phased array antenna by using a null-space medium
F. Sun,S. He
Physics , 2014, DOI: 10.1038/srep06832
Abstract: By introducing a columnar null-space region as the reference space, we design a radome that can extend the scanning angle of a phased array antenna (PAA) by a predetermined relationship (e.g. a linear relationship between the incident angle and steered output angle can be achieved). After some approximation, we only need two homogeneous materials to construct the proposed radome layer by layer. This kind of medium is called a null-space medium, which has been studied and fabricated for realizing hyper-lenses and some other devices. Numerical simulations verify the performance of our radome.
Localized steady-state domain wall oscillators
J. He,S. Zhang
Physics , 2007,
Abstract: We predict a spatially localized magnetic domain wall oscillator upon the application of an external magnetic field and a DC electric current. The amplitude and frequency of the oscillator can be controlled by the field and/or the current. The resulting oscillator could be used as an effective microwave source for information storage application.
Static magnetic field concentration and enhancement using magnetic materials with positive permeability
F. Sun,S. He
Physics , 2013,
Abstract: In this paper a novel compressor for static magnetic fields is proposed based on finite embedded transformation optics. When the DC magnetic field passes through the designed device, the magnetic field can be compressed inside the device. After it passes through the device, one can obtain an enhanced static magnetic field behind the output surface of the device (in a free space region). We can also combine our compressor with some other structures to get a higher static magnetic field enhancement in a free space region. In contrast with other devices based on transformation optics for enhancing static magnetic fields, our device is not a closed structure and thus has some special applications (e.g., for controlling magnetic nano-particles for gene and drag delivery). The designed compressor can be constructed by using currently available materials or DC meta-materials with positive permeability. Numerical simulation verifies good performance of our device.
Graphene nano-ribbon waveguides
S. He,X. Zhang,Y. He
Physics , 2013,
Abstract: Graphene as a one-atom-thick platform for infrared metamaterial plays an important role in optical science and engineering. Here we study the unique properties of some plasmonic waveguides based on graphene nano-ribbon. It is found that a graphene ribbon of finite width leads to the occurrence of coupled edge mode. The single-mode region of a single freestanding graphene ribbon is identified at a fixed frequency of 30 THz. A low-loss waveguide structure, consisting of a graphene layer, a silica buffer layer and silicon substrate is proposed to reduce the propagation loss and obtain a high figure of merit for future integration of waveguide devices. Furthermore, two coupled ribbon configurations, namely, side-side coupling and top-bottom coupling, are investigated. As a device example, a nano-ring cavity of ultra-small size is designed.
Mode Coupling in a Tapered Slow Light Waveguide
S. He,Y. He,Y. Jin,J. He
Physics , 2010,
Abstract: Metamaterials with simultaneous negative permittivity and negative permeability (also called left-handed materials) open new avenues to achieving unprecedented physical properties and functionality unattainable with naturally occurring materials. It has been predicted that a metamaterial slab waveguide can slow down light significantly (even to zero velocity) as the thickness of the core layer approaches a critical thickness. Here we show that coupling between the forward and backward modes becomes significant near the critical thickness due to the good matching of the wavevectors and modal profiles of the two modes. Physical explanation and impact of this coupling are given.
Page 1 /347867
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.