oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
An Efficient Method to Reduce the Numerical Dispersion in the HIE-FDTD Scheme  [PDF]
Juan Chen, Anxue Zhang
Wireless Engineering and Technology (WET) , 2011, DOI: 10.4236/wet.2011.21005
Abstract: A parameter optimized approach for reducing the numerical dispersion of the 3-D hybrid implicit-explicit finite-difference time-domain (HIE-FDTD) is presented in this letter. By adding a parameter into the HIE-FDTD formulas, the error of the numerical phase velocity can be controlled, causing the numerical dispersion to decrease significantly. The numerical stability and dispersion relation are presented analytically, and numerical experiments are given to substantiate the proposed method.
Highly-efficient FDTD method of full-wave analysis on the microstrip defected ground structure
FDTD全波分析缺陷地结构微带线的高效算法实现

LAN Jing,YANG Yang,DAI Jing-Yi,
兰婧
,杨阳,戴婧怡

重庆邮电大学学报(自然科学版) , 2012,
Abstract: The defected ground structure (DGS) has slow wave, high impedance and many other characteristics. It is becoming a research focus for microwave circuit design in recent years. The Courant condition must be satisfied when using the conventional FDTD method to estimate the DGS, which makes the conventional FDTD method inefficient. In this paper, the HIE-FDTD method which is weakly conditionally stable is transformed for analysis of microstrip DGS planar circuits, at the same time, the numerical results for the conventional FDTD method are also rendered for comparing and validation. Finally, it shows that the HIE-FDTD method agrees very well with the conventional FDTD method and saves time remarkably. The absorbing boundary conditions for the HIE-FDTD method are also presented.
Applications of a Three-Dimensional FDTD Method with Weakly Conditional Stability to the Analysis of Microstrip Filters with Fine Scale Structures
Jing Lan;Yang Yang;Jing Yi Dai
PIER Letters , 2011, DOI: 10.2528/PIERL11082213
Abstract: In three-dimensional space, the hybrid implicit-explicit finite-difference time-domain (HIE-FDTD) method is weakly conditionally stable, only determined by two space-discretizations, which is very useful for problems with fine structures in one direction. Its numerical dispersion errors with nonuniform cells are discussed and compared in this paper. To enlarge the applicable field of the HIE-FDTD method to open space, the absorbing boundary conditions (ABCs) for this method are also introduced and applied. Two microstrip filters with fine scale structures in one direction are solved by the HIE-FDTD method. Conventional FDTD method and alternating-direction implicit FDTD (ADI-FDTD) method are also used for comparing. Results analyzed by the HIE-FDTD method agree well with those from conventional FDTD, and the required central process unit (CPU) time is much less than that of the ADI-FDTD method.
Hyper lgE syndrome (HIE): Report of 11 cases
Moeen M,Movahedi M,Farhoodi A
Tehran University Medical Journal , 1997,
Abstract: HIE is a primary immunodeficiency characterized by recurrent staphylococcal abscesses and markedly elevated serum IgE concentrations. These abcesses involve the skin, lungs, joints, and other sites, and there is a unique tendency to form pneumatoceles following staphylococcal pneumonias. Although, there is as yet no clearly defined immunologic cause for this rare syndrome, but some form of T-Cell defect may be cause, leading to matkedly elevation of IgE and eosinophillia. In this study clinical and immunopathological aspects of HIE syndrome in 11 patients have been evaluated
Statistical Analysis of Hie (Cold Sensation) and Hiesho (Cold Disorder) in Kampo Clinic  [PDF]
Tetsuhiro Yoshino,Kotoe Katayama,Kaori Munakata,Yuko Horiba,Rui Yamaguchi,Seiya Imoto,Satoru Miyano,Kenji Watanabe
Evidence-Based Complementary and Alternative Medicine , 2013, DOI: 10.1155/2013/398458
Abstract: A cold sensation (hie) is common in Japanese women and is an important treatment target in Kampo medicine. Physicians diagnose patients as having hiesho (cold disorder) when hie disturbs their daily activity. However, differences between hie and hiesho in men and women are not well described. Hie can be of three types depending on body part where patients feel hie. We aimed to clarify the characteristics of patients with hie and hiesho by analyzing data from new patients seen at the Kampo Clinic at Keio University Hospital between 2008 and 2013. We collected information about patients’ subjective symptoms and their severity using visual analogue scales. Of 4,016 new patients, 2,344 complained about hie and 524 of those were diagnosed with hiesho. Hie was most common in legs/feet and combined with hands or lower back, rather than the whole body. Almost 30% of patients with hie felt upper body heat symptoms like hot flushes. Cold sensation was stronger in hiesho than non-hiesho patients. Patients with hie had more complaints. Men with hiesho had the same distribution of hie and had symptoms similar to women. The results of our study may increase awareness of hiesho and help doctors treat hie and other symptoms. 1. Introduction In Japan, hie (cold sensation) and hiesho (cold disorder) are different terms. While hie is used to describe the subjective, uncomfortable feeling of coldness, hiesho is the diagnosis given by physicians to patients with cold sensations that disturb their daily living. Therefore, the first distinction to make is one between normal and hie groups. Those who experience hie can further be subdivided into hiesho and non-hiesho categories (Figure 1). Figure 1: Hie and hiesho. In Japan hie (cold sensation) and hiesho (cold disorder) are different terms. While hie is the term used to describe the subjective, uncomfortable feeling of coldness, hiesho is the diagnosis given by physician to patients with cold sensation disturbing their daily living. Therefore, the first distinction is between normal and hie group. The hie group is subdivided into hiesho and non-hiesho. Hiesho is the most common diagnosis given in Japanese Kampo clinics [1]. In Japanese Kampo medicine, hiesho is treated as a unique pathological condition. In contrast, cold sensation is only one of many symptoms asked about in a review of systems in Western medicine. One definition of hiesho for diagnosis is an “abnormal, subjective sensitivity to coldness in the lower back, the extremities, other localized regions of the body, or the whole body despite ambient temperatures. It
FDTD全波分析缺陷地结构微带线的高效算法实现  [PDF]
兰婧,杨阳,戴婧怡
重庆邮电大学学报(自然科学版) , 2012,
Abstract: 缺陷地结构(defectedgroundstructure,DGS)具有慢波、高阻抗等特性,是近年来微波电路设计领域的一个研究热点,在运用传统时域有限差分(finite-differencetime-domain,FDTD)方法分析DGS时,因Courant稳定性条件其计算效率受限。提出将一种弱条件稳定的混合隐显式FDTD(hybridimplicit-explicitFDTD,HIE-FDTD)方法经变换应用于分析具有缺陷地结构的微带平面电路,同时用传统FDTD方法的仿真结果与该方法的结果做比较。数值结果表明,该HIE-FDTD方法显著节省了计算时间,是一种高效可行的算法。另外还提出了适用于该方法的吸收边界条件的具体实现方案。
?横轴改?  [PDF]
程滋民
地质与勘探 , 1957,
Abstract: 103?利用500m?机?横?改?成300m??用横?,解决了备件缺乏??。其方法是将500m?横轴的键槽用雷焊填补,再车成300m转机横轴的设计尺寸,即可使用.
IDENTIFIKASI JALUR PEJALAN KAKI DI KAWASAN WATERFRONT, SENG HIE, PONTIANAK  [cached]
GULTOM, Bontor Jumaylinda
Dimensi : Journal of Architecture and Built Environment , 2012,
Abstract: Kota yang terletak pada kondisi geografis berada pada tepian sungai, sebaiknya menggunakan prinsip waterfront dalam perancangan kotanya. Salah satu prinsip waterfront adalah terdapat akses untuk memudahkan manusia berhubungan dengan air. Belakangan ini, terjadi kecenderungan mulai ditinggalkannya transportasi sungai dan beralih ke transportasi darat yang memastikan bahwa hubungan manusia dengan air akan semakin berkurang. Seng Hie sebagai salah satu kawasan waterfront di Pontianak, merupakan daerah yang memungkinkan publik untuk berhubungan langsung dengan air. Apakah di Seng Hie masih terdapat jalur pejalan kaki yang dapat memberi citra kawasan waterfront? Pertanyaaan ini dapat dijawab dengan melakukan penelitian dengan mengidentifikasi jalur pajalan kaki yang berada di kawasan waterfront, Seng Hie. Metode penelitian yang digunakan adalah rasionalistik kualitatif. Menggunakan metode deskriptif dan evaluative berdasarkan parameter teori. Penelitian dilakukan pada kawasan dengan membagi kawasan menjadi 4 (empat) penggal, berdasarkan kondisi eksisting terdapatnya akses yang membagi kawasan. Lingkup penelitian merupakan batasan terhadap keberadaan dan jenis jalur pejalan kaki. Pada kawasan Seng Hie masih ditemukan tersedianya jalur pejalan kaki, dengan 5 (lima) jenis jalur pejalan kaki. Terdapat permasalahan umum pada keseluruhan kawasan, yaitu: tidak terdapat kesinambungan hubungan seluruh jalur pejalan kaki, jalur pejalan kaki tidak dapat memberi kenyamanan bagi publik untuk berhubungan langsung dengan air, jalur pejalan kaki tidak memberi keleluasaan publik untuk menikmati pemandangan sungai, dan dermaga tidak dapat menampung kegiatan komersial yang melayani kegiatan rekreasi. Hasil penelitian tersebut dapat disimpulkan bahwa kawasan Seng Hie tidak menyediakan jalur pejalan kaki yang sesuai dengan prinsip waterfront.
Beam Dynamics Studies for the HIE-ISOLDE Linac at CERN  [PDF]
M. A. Fraser,M. Pasini,R. M. Jones,M. Lindroos
Physics , 2009,
Abstract: The upgrade of the normal conducting (NC) Radioactive Ion Beam EXperiment (REX)-ISOLDE heavy ion accelerator at CERN, under the High Intensity and Energy (HIE)-ISOLDE framework, proposes the use of superconducting (SC) quarter-wave resonators (QWRs) to increase the energy capability of the facility from 3 MeV/u to beyond 10 MeV/u. A beam dynamics study of a lattice design comprising SC QWRs and SC solenoids has confirmed the design's ability to accelerate ions, with a mass-to-charge ratio in the range 2.5 < A/q < 4.5, to the target energy with a minimal emittance increase. We report on the development of this study to include the implementation of realistic fields within the QWRs and solenoids. A preliminary error study is presented in order to constrain tolerances on the manufacturing and alignment of the linac.
管钳子改??活  [PDF]
直爽
地质与勘探 , 1957,
Abstract: ?探??常用的工具――管?子,在工作中损坏是?多的,特?是?子?和?子箍更易?坏,而?子把损坏的?少。因此利用?子把再加工改??活成管?子是一?有效的节?措施。105勘探?已??用?一方法,解?了管?子改??活?题。他们的改??程是:???的???加?剁?,每????可?成????。剁?后,再加?至可??度(?1150°~200℃左右),?行?加工成?子?形?,再???工加工即成成品。其次再利用??粒??(如?之1)改??子箍,首先作成如?之2及3所示的???模,其中3?芯模,4??模。具?作法是???粒??按改?管?子箍所需的?度在?床上切好,放在?中加?,
Page 1 /100
Display every page Item


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