基于Centripetal Catmull-Rom曲线的经食道超声心动图左心室分割方法

针对2维超声心动图像噪声大且难于分割的特点,提出基于Centripetal Catmull-Rom曲线的多尺度活动形状模型的左心室分割方法。该算法在金字塔上层提取2维轮廓法线向量特征并采用马氏距离寻找新的特征点位置;在图像金字塔底层快速提取特征点周围的Log-Gabor特征并使用Gentle Ada Boost训练分类器,选择置信度水平最高的点作为新的特征点位置。实验证明,这种方法较之传统活动形状模型分割更为精确且分割结果交互方便,有利于对结果的再编辑。

Calculating Newton’s Gravity (Big G) from Coulomb, Lorentz and Centripetal Force

The velocity of the Earth around the Sun and its corresponding mass are used in a standard centripetal force equation to match what Isaac Newton calculated with the Universal Law of Gravitation in 1687. Electromagnetic calculations are used to prove that electromagnetic forces are an insignificant contributor to the centripetal force or gravity, but do provide the bending force for the planets to maintain a circular orbit around the Sun. It is thus proven using classical physics that the force of gravity is a simple centripetal force with a very small electromagnetic force contribution.

Resulting of pedigree and topology of centripetal spatial schema in Chinese traditional cities

Chinese Traditional Maps and Local Chronicles serve as significant sources for investigating the urban history of ancient Chinese cities.These documents prioritize the abstract representation of topological relationships over precise numerical values and geometric shapes.This is consistent with the traditional Chinese city image and spatial schema emphasizing“harmony between man and nature”.Most Chinese Traditional Maps reflect a centripetal spatial schema,wherein the core area is located at the center,and other locations are positioned hierarchically about the center.Based on this data,this research aims to categorize and examine the development and evolution of the centripetal spatial schema in ancient Chinese cities by constructing a pedigree of types.The authors identify three types and summarize their causes,calculate the topological features,and reveal their correlations with the type of pedigree.This study reveals that cities with different centripetal forms exhibit regular differences in the accessibility,centrality,and functional attributes of central nodes,as well as the proportion of nodes with different attributes in the city.Overall,the conclusion aims to deepen people’s understanding of traditional Chinese spatial concepts at the macro-urban level,particularly in the context of China’s current urban renewal wave.Additionally,it provides practical references for inheriting and applying Chinese traditional construction wisdom.

Symmetric Surface Momentum and Centripetal Force for a Particle on a Curved Surface

The Hermitian surface momentum operator for a particle confined to a 2D curved surface spanned by orthogonal coordinates and embedded in 3D space is expressed as a symmetric expression in derivatives with respect to the surface coordinates and so is manifestly along the surface. This is an alternative form to the one reported in the literature and usually named geometric momentum, which has a term proportional to the mean curvature along the direction normal to the surface, and so"apparently"not along the surface. The symmetric form of the momentum is the sum of two symmetric Hermitian operators along the two orthogonal directions defined by the surface coordinates.The centripetal force operator for a particle on the surface of a cylinder and a sphere is calculated by taking the time derivative of the momentum and is seen to be a symmetrization of the well-known classical expressions.

Acceleration sensing based on piezoresistive effect of carbon nanotube films

Based on piezoresistive effect, the acceleration sensitivity of multi-walled canbon nanotube (MWNT) films was investigated. A three-point bending technique was presented to measure the piezoresistivity, which used a bending stress applied to the samples while making MWNT films wheeling with a rotational machine. The experimental results showed that the fractional increase in resistance increases linearly versus the increase of centripetal acceleration, and there is a linear relationship between the acceleration and the strain. These shed light on using carbon nanotube films as acceleration sensors for many potential applications.

A METHOD OF SHAPE ENCODING AND RETRIEVAL

A method of shape encoding and retrieval is proposed in this letter, which uses centripetal code to encode shape and extracts shape's convex for retrieval. For the rotation invariance and translation invariance of the centripetal code and the normalization of convex,the proposed retrieval method is similarity transform resistant, Experimental results confirm this capability.

Magnetic Inertial Confinement Fusion(MICF)

t Based on the similarity in models of the early Sun and the 3-D common focal region of the micro-pinch in X-pinch experiments, a novel hybrid fusion configuration by continuous focusing of multiple Z-pinched plasma beams on spatially symmetric plasma is proposed. By replacing gravity with Lorentz force with subsequent centripetal spherical pinch, the beam- target fusion reactivity is enhanced in a quasi-spherical converging region, thus achieving MICF. An assessment, presented here, suggests that a practical fusion power source could be achieved using deuterium alone. Plasma instabilities can be suppressed by fast rotation resulting from an asymmetric tangential torsion in the spherical focal region of this configuration. Mathematical equivalence with the Sun allows the development of appropriate equations for the focal region of MICF, which are solved numerically to provide density, temperature and pressure distributions that produce net fusion energy output. An analysis of MICF physics and a preliminary experimental demonstration of a single beam are also carried out.

Cosmic Power Generation and Gravity

By modeling the Sun as an electrical dynamo, the speed and frequency of the Sun’s electromagnetic field is determined. The results confirm the approximate radius of the Sun’s inner core 1,220,000 meters and gravity at its surface, 274 m/s2. The Sun’s rotating electromagnetic field radiates to Pluto and beyond. Like gravity, the near magnetic field of a sphere weakens with the inverse square of the distance. The Sun is a constant speed and constant acceleration machine. Like a set speed Ferris wheel, the orbital speed of planets is faster nearer to the Sun and reduces as the distance increases. The Standard Gravitation Parameter (m3/s2) is analogous to accelerating cubic volume (m3/s2) of the solar system. The planets are being pushed away by a centrifugal force from the constant acceleration of the Sun’s magnetic field, while at the same time being pulled in by the force of the Sun’s centripetal acceleration. Planetary orbits are the result of this balancing of forces. Gravity is a centripetal acceleration derived from a rotating electromagnetic field. Gravity is derived from an electromagnetic field which means it is not a force. There are only three forces in the universe: electromagnetic, strong nuclear and weak nuclear.

Electro Dynamo Theory of Gravity (g)

In this paper, flux transfer events from the Sun to the Earth are represented as an electrical frequency. The Earth’s inner core is modeled as a motor armature and the mechanical speed is calculated from the frequency of flux transfer events. The speed of the inner core creates a centripetal acceleration at the center of the Earth that is much higher than ever thought possible. The synchronous speed is the speed of the electromagnetic field that orbits or rotates around the Earth. All electrical machines have a rotating electromagnetic field that establishes the synchronous speed. Gravity is a centripetal acceleration derived from the synchronous speed of the electromagnetic field. The mechanical speed is somewhat less based on slip, which ranges from 1% to 10% for the electrical machine we call Earth. Flux transfer event from the Sun to the Earth is what powers the machine. By adjusting for the altitude distance, from the inner core to the surface of the Earth, a value of 9.806 m/s2 is calculated. The very nature of gravity has been discovered and explained using electrical equations and classical physics. There are only three forces of nature: electromagnetic, strong nuclear and weak nuclear.

Energy Electromagnetic Force Equivalence, <i>E = F_ex r</i>

By combing the mass energy equivalence formula, E=mc2, with the speed of light and gravity formula, , a new equation for energy is derived. The Energy Electromagnetic Force Equivalence is used to explain the rotational torque of the stars, planets, and galaxy. A greater understanding of the universe is achieved with a simple mathematical expression. Nuclear energy from the Sun is converted to an electrical force which pervades the universe and gives the bodies within it, rotational motion. It is a macro equation for action at a distance. The equation suggests that nuclear energy and electromagnetic force is one of the most basic equations of the universe. It is proposed that there is only one all-encompassing force of the universe, the electromagnetic force.

Theory of Electromagnetism and Gravity —Modeling Earth as a Rotating Solenoid Coil

Presented in this manuscript are conventional electrical engineering tools to model the earth as a rotating electrical machine. Calculations using known parameters of the earth and measured field data has resulted in new understanding of the earth’s electrical system and gyroscopic rotation. The material makeup of the inner earth is better understood based on derived permeability and permittivity constants. The planet has been modeled as simple coils and then as a parallel impedance circuit which has led to fundamental insight into planetary speed control and RLC combination for Schumann Resonance of 7.83 Hz. Torque and Voltage Constants and the inverse Speed Constant are calculated using three methods and all compare favorably with Newton’s Gravitational Constant. A helical resonator is referenced and Schumann’s Resonant ideal frequency is calculated and compared with others idealism. A new theory of gravity based on particle velocity selector at the poles is postulated. Two equations are presented as the needed links between Faraday’s electromagnetism and Newtonian physics. Acceleration and Deceleration of earth is explained as a centripetal governor. A new equation for planetary attraction and the attraction of atomic matter is theorized. Rotation of the earth’s electrical coil is explained in terms of the Richardson effect. Electric power transfer from the sun to the planets is proposed via Flux Transfer Events. The impact of this evolving science of electromagnetic modeling of planets will be magnified as the theory is proven, and found to be useful for future generations of engineers and scientists who seek to discover our world and other planets.

A New View of the Dynamics of Particle Structure

The new view denies the existence of fundamental particles in matter, and instead states that any particle and matter is a dynamic superposition of three natural elements, motion, force, and emptiness. This paper proposes a new theory of the structure of matter and the unification of the four forces. A correct understanding of the logic of material structure will enable atomic energy and nuclear physics to generate new manufacturing ideas. The dissertation expounds the natural distribution of dynamics and forces in space and the new deterministic theory of dynamic relationship. This theory solves problems such as the unity of the four forces and the dynamic laws of the material structure. In practical applications, it can provide new theoretical guidance for industrial manufacturing such as nuclear energy, fusion engineering, new energy, new materials, battery energy storage, new-generation reactors, etc., and then adopt effective means in line with the laws of natural power to make the substances needed by human beings. The supply of resources and energy is perfectly satisfied. Applying this theoretical model of material structure to all aspects of the manufacturing industry will surely open up a new era of material civilization for human beings.

Alleviating limit cycling in training GANs with an optimization technique

In this paper,we undertake further investigation to alleviate the issue of limit cycling behavior in training generative adversarial networks(GANs)through the proposed predictive centripetal acceleration algorithm(PCAA).Specifically,we first derive the upper and lower complexity bounds of PCAA for a general bilinear game,with the last-iterate convergence rate notably improving upon previous results.Then,we combine PCAA with the adaptive moment estimation algorithm(Adam)to propose PCAA-Adam,for practical training of GANs to enhance their generalization capability.Finally,we validate the effectiveness of the proposed algorithm through experiments conducted on bilinear games,multivariate Gaussian distributions,and the CelebA dataset,respectively.

Compressor and Turbine Multidisciplinary Design for Highly Efficient Micro-gas Turbine

Multidisciplinary design optimization （MDO） is widely employed to enhance turbomachinery compo- nents efficiency. The aim of this work is to describe a complete tool for the aero-mechanical design of a radial in- flow turbine and a centrifugal compressor. The high rotational speed of such machines and the high exhaust gas temperature （only for the turbine） expose blades to really high stresses and therefore the aerodynamics design has to be coupled with the mechanical one through an integrated procedure. The described approach employs a fuUy 3D Reynolds Averaged Navier-Stokes （RANS） solver for the aerodynamics and an open source Finite Element Analysis （FEA） solver for the mechanical integrity assessment. Due to the high computational cost of both these two solvers, a meta model, such as an artificial neural network （ANN）, is used to speed up the optimization design process. The interaction between two codes, the mesh genera- tion and the post processing of the results are achieved via in-house developed scripting modules. The obtained results are widely presented and discussed.