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Search Results: 1 - 10 of 237 matches for " Tada "
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Current-Controlled CFTA Based Fractional Order Quadrature Oscillators  [PDF]
Tada Comedang, Pattana Intani
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.713345
Abstract: This paper presents a study of fractional order quadrature oscillators based on current-controlled current follower transconductance amplifiers (CCCFTA). The design realisation and performance of the fractional order quadrature oscillators have been presented. The quadrature oscillators are constructed using three fractional capacitors of orders α = 0.5. The fractional capacitor is not available on the market or in the PSPICE program. Fortunately, the fractional capacitor can be realised by using the approximate method for the RC ladder network approximation. The oscillation frequency and oscillation condition can be electronically/orthogonally controlled via input bias currents. Due to high-output impedances, the proposed circuit enables easy cascading in current-mode (CM). The PSPICE simulation results are depicted, and the given results agree well with the anticipated theoretical outcomes.
Idiopathic Epicardial Ventricular Arrhythmias: Diagnosis and Ablation Technique from the Aortic Sinus of Valsalva
Hiroshi Tada
Indian Pacing and Electrophysiology Journal , 2005,
Abstract: Idiopathic outflow tract arrhythmias (ventricular tachycardias or symptomatic premature ventricular contractions; OT-VT/PVCs) can originate from the left ventricular (LV) epicardium (Epi-VT/PVCs), and radiofrequency (RF) energy applications from the aortic sinus of Valsalva can eliminate Epi-VT/PVCs in selected patients. Among the various ECG findings, the R-wave duration index and R/S amplitude index in leads V1 or V2 are useful for identifying Epi-VT/PVCs, and the Q-wave ratio of leads aVL to aVR and S-wave amplitude in lead V1 are useful for differentiating between an Epi-VT/PVC originating from the LV epicardium remote from the left sinus of Valsalva (LSV) and that from the LSV. Tissue tracking imaging is a promising modality for identifying the origin of OT-VT/PVCs and for differentiating between an Epi-VT/PVC originating from the LV epicardium remote from the LSV and that from the LSV. If the origin of the Epi-VT/PVC is identified within the LSV, coronary and aortic angiography should be performed to assess the anatomic relationships between the Epi-VT/PVC origin and coronary arteries and aortic valve before the RF energy delivery. To avoid potential complications, RF ablation should be performed at the LSV using a maximum power of 35 watts and maximum temperature of 55°C. Epicardial mapping through the coronary venous system and the presence of potentials recorded from the ablation site within the LSV and their changes before and after the RF energy applications may be useful for diagnosing Epi-VT/PVCs or predicting a successful catheter ablation from the LSV.
Toward the Philosophy of CAM: Super-system and Epimedical Sciences
Tomio Tada
Evidence-Based Complementary and Alternative Medicine , 2004, DOI: 10.1093/ecam/neh012
Abstract:
Matrix model criticality and resonant tunneling
Tsukasa Tada
Physics , 2012, DOI: 10.1143/PTP.128.429
Abstract: We suggest that the Hermitian matrix models with resonant tunneling may exhibit novel criticality. Some features of the proposed criticality are explored. In particular, we argue that the new critical point is connected with the first-order transition.
Sine-Square Deformation and its Relevance to String Theory
Tsukasa Tada
Physics , 2014, DOI: 10.1142/S0217732315500923
Abstract: Sine-square deformation, a recently found modulation of the coupling strength in certain statistical models, is discussed in the context of two-dimensional conformal field theories, with particular attention to open/closed string duality. This deformation is shown to be non-trivial and leads to a divergence in the worldsheet metric. The structure of the vacua of the deformed theory is also investigated. The approach advocated here may provide an understanding of string duality through the worldsheet dynamics.
Equilibrium Surface Current and Role of U(1) Symmetry: sum rule and surface perturbations
Yasuhiro Tada
Physics , 2015, DOI: 10.1103/PhysRevB.92.104502
Abstract: We discuss effects of surface perturbations on equilibrium surface currents which contribute to orbital magnetization and orbital angular momentum in systems without time reversal symmetry. We show that, in a U(1) particle number conserving system, disorder and other perturbations at a surface do not affect the equilibrium surface current and corresponding orbital magnetization due to a sum rule which is analogous to Luttinger's theorem. On the other hand, for a superfluid, the sum rule is no longer applicable and hence the surface mass current and corresponding orbital angular momentum can depend on details of a surface.
RP105-Negative B Cells in Systemic Lupus Erythematosus
Syuichi Koarada,Yoshifumi Tada
Clinical and Developmental Immunology , 2012, DOI: 10.1155/2012/259186
Abstract: Systemic lupus erythematosus (SLE) is a multisystem disease characterized by B cells producing autoantibodies against nuclear proteins and DNA, especially anti-double-strand DNA (dsDNA) antibodies. RP105 (CD180), the toll-like receptor- (TLR-) associated molecule, is expressed on normal B cells. However, RP105-negative B cells increase in peripheral blood from patients with active SLE. RP105 may regulate B-cell activation, and RP105-negative B cells produce autoantibodies and take part in pathophysiology of SLE. It is possible that targeting RP105-negative B cells is one of the treatments of SLE. In this paper, we discuss the RP105 biology and clinical significance in SLE.
Nonlinear analysis of flexible beams undergoing large rotations Via symbolic computations
Xiaofeng Yuan,Yukio Tada
Mathematical Problems in Engineering , 2001, DOI: 10.1155/s1024123x01001636
Abstract: In this paper, a two-stage approach is presented for analyzing flexible beams undergoing large rotations. In the first stage, the symbolic forms of equations of motion and the Jacobian matrix are generated by means of MATLAB and written into a MATLAB script file automatically, where the flexible beams are described by the unified formulation presented in our previous paper. In the second stage, the derived equations of motion are solved by means of implicit numerical methods. Several comparison computations are performed. The two-stage approach proves to be much more efficient than pure numerical one.
A simple hepatic cyst with elevated serum and cyst fluid CA19-9 levels: a case report
Hidekatsu Yanai, Norio Tada
Journal of Medical Case Reports , 2008, DOI: 10.1186/1752-1947-2-329
Abstract: A 76-year-old Japanese woman was diagnosed as having an infected hepatic cyst, by physical examination and enhanced abdominal computed tomography. Serum (170 U/ml; reference: < 37 U/ml) and hepatic cyst fluid (371 U/ml) CA19-9 levels were elevated. After the intracystic instillation of minocycline hydrochloride, necrotic cells in the cyst were drained, and it totally collapsed after 1 week. Cyst fluid CA19-9 levels increased remarkably after the intracystic instillation of minocycline hydrochloride, while serum CA19-9 levels decreased significantly.Our study is the first report to reveal the influence of intracystic instillation of minocycline hydrochloride on serum and cyst fluid CA19-9 levels in a patient with a simple hepatic cyst.Benign hepatic cysts are commonly observed in the general population, however, they rarely cause symptoms. Simple hepatic cysts are generally stable in size over time, but may grow slowly and occasionally become symptomatic due to mass effect, rupture, hemorrhage, and infection [1]. We report a patient with a large hepatic cyst with elevated serum and cyst fluid CA19-9 levels. Further, we studied serum and cyst fluid CA19-9 levels in this patient, before and after intracystic instillation of minocycline hydrochloride.A 76-year-old Japanese woman was admitted because of fever and chill. Physical examination revealed percussion tenderness in the right upper quadrant. She had previously been diagnosed as having a large simple hepatic cyst and elevated serum CA19-9 levels. Laboratory examination showed increased serum levels of C-reactive protein (CRP) (14.5 mg/dl; reference: < 0.3 mg/dl) and CA19-9 (170 U/ml; reference: < 37 U/ml), and Escherichia coli were cultured from blood. Enhanced abdominal computed tomography (CT) showed a large hepatic cyst with partially enhanced thickened cystic wall (Figure 1A). From this and the tenderness to touch in her right upper quadrant, we diagnosed an infected hepatic cyst [2], and started antibiotic th
Nonlinear analysis of flexible beams undergoing large rotations Via symbolic computations
Yuan Xiaofeng,Tada Yukio
Mathematical Problems in Engineering , 2001,
Abstract: In this paper, a two-stage approach is presented for analyzing flexible beams undergoing large rotations. In the first stage, the symbolic forms of equations of motion and the Jacobian matrix are generated by means of MATLAB and written into a MATLAB script file automatically, where the flexible beams are described by the unified formulation presented in our previous paper. In the second stage, the derived equations of motion are solved by means of implicit numerical methods. Several comparison computations are performed. The two-stage approach proves to be much more efficient than pure numerical one.
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