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On a Heuristic Viewpoint Concerning the Conversion and Transformation of Sound into Light
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作者 Alessandro Rizzo 《Journal of High Energy Physics, Gravitation and Cosmology》 CAS 2024年第1期363-385,共23页
In the study of Terrestrial Gamma-ray Flashes (TGFs) and Sonoluminescence, we observe parallels with larger cosmic events. Specifically, sonoluminescence involves the rapid collapse of bubbles, which closely resembles... In the study of Terrestrial Gamma-ray Flashes (TGFs) and Sonoluminescence, we observe parallels with larger cosmic events. Specifically, sonoluminescence involves the rapid collapse of bubbles, which closely resembles gravitational collapse in space. This observation suggests the potential formation of low-density quantum black holes. These entities, which might be related to dark matter, are thought to experience a kind of transient evaporation similar to Hawking radiation seen in cosmic black holes. Consequently, sonoluminescence could be a valuable tool for investigating phenomena typically linked to cosmic scale events. Furthermore, the role of the Higgs boson is considered in this context, possibly connecting it to both TGFs and sonoluminescence. This research could enhance our understanding of the quantum mechanics of black holes and their relation to dark matter on Earth. 展开更多
关键词 Planck Mass Gravity light PHONONS Phononic Field Vacuum Hydrodynamics SONOLUMINESCENCE Hawking Radiation Quantum Black Holes theory of General Singularity
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On the Vacuum Hydrodynamics of Moving Bodies—The Theory of General Singularity
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作者 Alessandro Rizzo 《Journal of High Energy Physics, Gravitation and Cosmology》 CAS 2024年第3期875-905,共31页
The Theory of General Singularity is presented, unifying quantum field theory, general relativity, and the standard model. This theory posits phonons as fundamental excitations in a quantum vacuum, modeled as a Bose-E... The Theory of General Singularity is presented, unifying quantum field theory, general relativity, and the standard model. This theory posits phonons as fundamental excitations in a quantum vacuum, modeled as a Bose-Einstein condensate. Through key equations, the role of phonons as intermediaries between matter, energy, and spacetime geometry is demonstrated. The theory expands Einsteins field equations to differentiate between visible and dark matter, and revises the standard model by incorporating phonons. It addresses dark matter, dark energy, gravity, and phase transitions, while making testable predictions. The theory proposes that singularities, the essence of particles and black holes, are quantum entities ubiquitous in nature, constituting the very essence of elementary particles, seen as micro black holes or quantum fractal structures of spacetime. As the theory is refined with increasing mathematical rigor, it builds upon the foundation of initial physical intuition, connecting the spacetime continuum of general relativity with the hydrodynamics of the quantum vacuum. Inspired by the insights of Tesla and Majorana, who believed that physical intuition justifies the infringement of mathematical rigor in the early stages of theory development, this work aims to advance the understanding of the fundamental laws of the universe and the perception of reality. 展开更多
关键词 Planck Mass GRAVITY light PHONONS Phononic Field Vacuum Hydrodynamics Bose-Einstein Condensate PHONONS Quantum Vacuum Unification GRAVITY Dark Matter Dark Energy theory of General Singularity
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基于LightGBM算法和出行链理论的电动汽车充电负荷多时间尺度预测模型
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作者 庞松岭 范凯迪 +1 位作者 陈超 窦洁 《汽车技术》 CSCD 北大核心 2024年第6期9-16,共8页
为提高电动汽车充电负荷预测的准确性,设计了一种基于轻量级梯度提升机(LightGBM)算法和出行链理论的电动汽车充电负荷多时间尺度预测模型。利用出行链描述用户出行过程,采用蒙特卡洛法抽取时空数据,计算不同区域出行和停留时间的概率... 为提高电动汽车充电负荷预测的准确性,设计了一种基于轻量级梯度提升机(LightGBM)算法和出行链理论的电动汽车充电负荷多时间尺度预测模型。利用出行链描述用户出行过程,采用蒙特卡洛法抽取时空数据,计算不同区域出行和停留时间的概率密度函数,采用牛顿法划分多时间尺度充电概率,明确驾驶时空分布与充电状况,并运用模糊数学定理与LightGBM分类充电负荷数据,构建了多季节多时段预测模型。采用LightGBM高效并行计算模式,明确充电负荷变化规律,实现了多时间尺度预测。试验结果表明:所建立的模型在不同季节和电动汽车数量条件下,预测误差低于100 kW,预测空报率低于3%,可准确展现充电负荷的变化规律。 展开更多
关键词 轻量级梯度提升机 出行链理论 充电负荷 多时间尺度 预测模型
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A Topological Magueijo-Smolin Varying Speed of Light Theory, the Accelerated Cosmic Expansion and the Dark Energy of Pure Gravity 被引量:8
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作者 Mohamed Salah El Naschie Leila Marek-Crnjac +1 位作者 Mohamed Atef Helal Ji-Huan He 《Applied Mathematics》 2014年第12期1780-1790,共11页
The paper presents a detailed analysis of ordinary and dark energy density of the cosmos based on two different but complimentary theories. First, and starting from the concept of the speed of light being an average o... The paper presents a detailed analysis of ordinary and dark energy density of the cosmos based on two different but complimentary theories. First, and starting from the concept of the speed of light being an average over multi-fractals, we use Magueijo-Smolin’s ingenious revision of Einstein’s special relativity famous formula E = mc2 to a doubly special formula which includes the Planck energy as invariant to derive the ordinary energy density E(O) = mc2/22 and the dark energy density E(D) = mc2(21/22) wheremis the mass andcis the speed of light. Second we use the topological theory of pure gravity to reach the same result thus confirming the correctness of the theory of varying speed of light as well as the COBE, WMAP and Type 1a supernova cosmological measurements. 展开更多
关键词 Dark ENERGY QUANTUM GRAVITY VARYING Speed of light theory ENERGY of QUANTUM Wave QUANTUM Non-Demolition
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Quantization of light energy directly from classical electromagnetic theory in vacuum 被引量:2
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作者 佘卫龙 《Chinese Physics B》 SCIE EI CAS CSCD 2005年第12期2514-2521,共8页
It is currently believed that light quantum or the quantization of light energy is beyond classical physics, and the picture of wave-particle duality, which was criticized by Einstein but has attracted a number of exp... It is currently believed that light quantum or the quantization of light energy is beyond classical physics, and the picture of wave-particle duality, which was criticized by Einstein but has attracted a number of experimental researches, is necessary for the description of light. It is shown in this paper, however, that the quantization of light energy in vacuum, which is the same as that in quantum electrodynamics, can be derived directly from the classical electromagnetic theory through the consideration of statistics based on classical physics. Therefore, the quantization of energy is an intrinsic property of light as a classical electromagnetic wave and has no need of being related to particles. 展开更多
关键词 the nature of light quantization of light energy classical electromagnetic theory consideration of statistics
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Mechanisms of ultrasonic modulation of multiply scattered incoherent light based on diffusion theory 被引量:1
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作者 朱莉莉 李晖 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第1期536-541,共6页
An analytic equation interpreting the intensity of ultrasound-modulated scattering light is derived, based on diffusion theory and previous explanations of the intensity modulation mechanism. Furthermore, an experimen... An analytic equation interpreting the intensity of ultrasound-modulated scattering light is derived, based on diffusion theory and previous explanations of the intensity modulation mechanism. Furthermore, an experiment of ultrasonic modulation of incoherent light in a scattering medium is developed. This analytical model agrees well with experimental results,which confirms the validity of the proposed intensity modulation mechanism. The model supplements the existing research on the ultrasonic modulation mechanism of scattering light. 展开更多
关键词 ultrasound-modulated scattering light intensity modulation mechanism diffusion theory incoherent light
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Thermal Analysis of Organic Light Emitting Diodes Based on Basic Heat Transfer Theory 被引量:1
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作者 张稳稳 吴朝新 +3 位作者 刘迎文 董军 严学文 侯洵 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第8期139-143,共5页
We investigate the thermal characteristics of standard organic light-emitting diodes (OLEDs) using a simple and clear 1D thermal model based on the basic heat transfer theory. The thermal model can accurately estima... We investigate the thermal characteristics of standard organic light-emitting diodes (OLEDs) using a simple and clear 1D thermal model based on the basic heat transfer theory. The thermal model can accurately estimate the device temperature, which is linearly with electrical input power. The simulation results show that there is almost no temperature gradient within the OLED device working under steady state conditions. Furthermore, thermal analysis simulation results show that the surface properties (convective heat transfer coetficient and surface emissivity) of the substrate or cathode can significantly affect the temperature distribution of the OLED. 展开更多
关键词 OLEDS Thermal Analysis of Organic light Emitting Diodes Based on Basic Heat Transfer theory EML
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Light Propagation in the Second post-Newtonian Approximation of Scalar-Tensor Theory of Gravity 被引量:2
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作者 DONG Peng LI Lei 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第3期457-461,共5页
在这份报纸,我们使用公制的系数和在分级张肌的理论的第二 Newtonian 以后近似获得导出秒顺序光繁殖方程和轻偏转角度并且把它与以前的工作作比较的运动的方程。这些结果为象与 micro-arcsecond 和 nano-arcsecond 精确性瞄准天体测量... 在这份报纸,我们使用公制的系数和在分级张肌的理论的第二 Newtonian 以后近似获得导出秒顺序光繁殖方程和轻偏转角度并且把它与以前的工作作比较的运动的方程。这些结果为象与 micro-arcsecond 和 nano-arcsecond 精确性瞄准天体测量学的 ASTROD, GAIA,达尔文和 SIM 一样的精确天体测量学使命是有用的,并且为第二个 Newtonian 以后框架和位置推算历需要让观察决定星并且太空船位置。 展开更多
关键词 引力理论 牛顿 张量 标量 光传播 逼近 运动方程 近似理论
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Light-Front Hamiltonian, Path Integral and BRST Formulations of the Chern-Simons Theory under Appropriate Gauge-Fixing 被引量:6
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作者 Usha Kulshreshtha Daya Shankar Kulshreshtha James P. Vary 《Journal of Modern Physics》 2010年第6期385-392,共8页
The Chern-Simons theory in two-space one-time dimensions is quantized on the light-front under appropriate gauge-fixing conditions using the Hamiltonian, path integral and BRST formulations.
关键词 HAMILTONIAN QUANTIZATION Path Integral QUANTIZATION BRST QUANTIZATION CHERN-SIMONS Theories light-CONE QUANTIZATION light-FRONT QUANTIZATION Constrained Dynamics Quantum Electrodynamics Models in Lower Dimensions
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Toward a Local Theory of Light
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作者 Richard A. Hutchin 《Optics and Photonics Journal》 2015年第7期247-259,共13页
Quantum mechanics is a probabilistic theory of the universe suggestive of a mean value theory similar to thermodynamics prior to the introduction of the atomic theory. If QM will follow a similar path to thermodynamic... Quantum mechanics is a probabilistic theory of the universe suggestive of a mean value theory similar to thermodynamics prior to the introduction of the atomic theory. If QM will follow a similar path to thermodynamics, then a local deterministic theory must be developed which matches QM predictions. There have been four tough barriers to a local theory of light, of which Bell’s Theorem has been considered the ultimate barrier. The other three barriers are explaining spontaneous emission, the reflection of a small fraction of light at a dielectric interface and the splitting action of a polarizer on polarized light (Malus’ Law). The challenge is that in a local theory of light, everything must have a specific cause and effect. There can be nothing spontaneous or hidden. Local solutions to all four of these barriers are presented in this paper, integrating results from two previous papers and adding the solution paths to the third and fourth barriers as well, which are nearly identical. A previous paper [1] used results from Einstein’s famous 1917 paper on stimulated emission to provide a deterministic local model for spontaneous emission. A second paper [2] showed that QM predictions in tests of Bell’s theorem could be matched with a local model by modifying the definition of entanglement in a manner invisible to quantum mechanics. This paper summarizes and extends those two results and then presents a deterministic model of reflection from a dielectric interface and transmission of polarized light through a polarizer that both match quantum mechanics. As the framework of a local theory of light emerges, it is not surprising that we find corners of physics where small disagreements with quantum mechanics are predicted. A new Bell type test is described in this paper which can distinguish the local from the nonlocal theory, giving predictions that must disagree slightly but significantly with quantum mechanics. If such experiments are proven to disagree with quantum mechanics, then the door to a local theory of light will be opened. 展开更多
关键词 ENTANGLED PHOTONS Bell’s Theorem LOCAL theory of light Tests of Quantum Mechanics Spontaneous Emission Malus’ Law Reflection from a Dielectric
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Faster than the Speed of Light Is a Quantum Phenomena
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作者 Ardeshir Irani 《Journal of High Energy Physics, Gravitation and Cosmology》 CAS 2023年第2期379-382,共4页
Classical Mechanics using Einstein’s theories of relativity places a limit on speed as the speed of light. Quantum Mechanics has no such limitation. To understand space accelerating faster than the speed of light and... Classical Mechanics using Einstein’s theories of relativity places a limit on speed as the speed of light. Quantum Mechanics has no such limitation. To understand space accelerating faster than the speed of light and information being exchanged instantaneously between two entangled electrons separated by huge distances, one uses Planck’s length, Planck’s time, and Planck’s mass to indicate that space and time are discrete and therefore along with masses smaller than Planck’s mass are Quantum Mechanical in nature. Faster than the speed of light c = 3 × 10<sup>8</sup> m/s is a classical effect only in dimensions of space lower than our 3-D Universe, but it is a Quantum effect in all dimensions of space. Because space can oscillate sending out ripples from the source, it is the medium used for transporting light waves and gravity waves. 展开更多
关键词 Faster than the Speed of light CLASSICAL QUANTUM Planck’s Units Space as a Medium Comparison with String theory
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Light-Front Hamiltonian, Path Integral and BRST Formulations of the Chern-Simons-Higgs Theory in the Broken Symmetry Phase
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作者 Usha Kulshreshtha Daya S. Kulshreshtha James P. Vary 《Journal of Modern Physics》 2013年第4期38-48,共11页
In the present work we study the Hamiltonian, path integral and BRST formulations of the Chern-Simons-Higgs theory in two-space one-time dimensions, in the so-called broken symmetry phase of the Higgs potential (where... In the present work we study the Hamiltonian, path integral and BRST formulations of the Chern-Simons-Higgs theory in two-space one-time dimensions, in the so-called broken symmetry phase of the Higgs potential (where the phase φ(xμ) of the complex matter field Φ(xμ) carries the charge degree of freedom of the complex matter field and is akin to the Goldstone boson) on the light-front (i.e., on the hyperplanes defined by the fixed light-cone time). The theory is seen to possess a set of first-class constraints and the local vector gauge symmetry. The theory being gauge-invariant is quantized under appropriate gauge-fixing conditions. The explicit Hamiltonian and path integral quantization is achieved under the above light-cone gauges. The Heisenberg equations of motion of the system are derived for the physical degrees of freedom of the system. Finally the BRST quantization of the system is achieved under appropriate BRST gauge-fixing, where the BRST symmetry is maintained even under the BRST light-cone gauge-fixing. 展开更多
关键词 light-FRONT QUANTIZATION HAMILTONIAN QUANTIZATION Path Integral QUANTIZATION BRST QUANTIZATION Constrained Dynamics Gauge SYMMETRY Chern-Simons-Higgs theory Broken SYMMETRY Phase HIGGS Potential Spontaneous SYMMETRY Breaking
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基于纽介堡方程的色纺织物颜色预测
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作者 杨柳 李羽佳 +2 位作者 俞琰 马磊 张瑞云 《纺织学报》 EI CAS CSCD 北大核心 2024年第1期83-89,共7页
色纺织物由多种色纤维混合织造,其颜色预测过程复杂,基于格拉斯曼色光混合理论和印刷网点的纽介堡方程,建立了便于计算的颜色预测模型。预测过程分2种情况讨论,一种是取决于表面一层色纤维,另一种是取决于最上面2层纤维相互作用。当考... 色纺织物由多种色纤维混合织造,其颜色预测过程复杂,基于格拉斯曼色光混合理论和印刷网点的纽介堡方程,建立了便于计算的颜色预测模型。预测过程分2种情况讨论,一种是取决于表面一层色纤维,另一种是取决于最上面2层纤维相互作用。当考虑最上面2层纤维相互叠加时,相互堆叠简化为与同色堆叠或与两色堆叠。根据不同方式各自建立颜色预测模型,选出预测色差最小的模型并对其优化。结果表明:当以色纺织物最上面2层纤维堆叠组成的色元对混色织物颜色预测时,2层纤维组分不同,认为堆叠顺序对该色元颜色值无影响建立的模型预测色差最小,且对该模型中各色元占比面积系数进行一阶线性回归修正后能较好地用于色纺织物表面颜色值的预测。 展开更多
关键词 格拉斯曼色光混合理论 色纺织物 纽介堡方程 颜色预测 色差
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基于健康信念理论的轻食智能厨具设计策略——以减肥人群为例
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作者 李纳璺 许丽本 《设计》 2024年第11期98-101,共4页
针对减肥人群对肥胖后果认识不到位、健康饮食习惯难以养成的现状,提出基于健康信念理论的轻食智能厨具设计策略。运用健康信念理论分析减肥人群生理、心理、行为特征,得到用户需求和设计机会点,总结出厨具产品在功能、使用、交互方面... 针对减肥人群对肥胖后果认识不到位、健康饮食习惯难以养成的现状,提出基于健康信念理论的轻食智能厨具设计策略。运用健康信念理论分析减肥人群生理、心理、行为特征,得到用户需求和设计机会点,总结出厨具产品在功能、使用、交互方面的触点,结合产品情感化设计原则,从本能层、行为层、反思层提出轻食智能厨具的设计策略。轻食智能厨具设计策略。该方法可为面向健康饮食场景中的轻食厨具产品设计和健康设计的探索扩宽思路。 展开更多
关键词 轻食厨具 健康信念理论 减肥人群 情感化设计 健康饮食
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基于ERK/p38 MAPK信号通路探究解毒活血汤治疗Ⅲ型前列腺炎的作用机制
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作者 严张仁 殷宏伟 +3 位作者 潘俊卿 邓思巧 刘灿 张乃忻 《云南中医药大学学报》 2024年第1期67-78,共12页
目的探究解毒活血汤调控ERK/p38 MAPK信号通路治疗Ⅲ型前列腺炎的作用机制。方法采用去势手术+苯甲酸雌二醇(EB)诱导慢性前列腺炎大鼠模型。36只SD大鼠随机分为空白组(生理盐水,4 mL·kg^(-1))、模型组(生理盐水,4 mL·kg^(-1)... 目的探究解毒活血汤调控ERK/p38 MAPK信号通路治疗Ⅲ型前列腺炎的作用机制。方法采用去势手术+苯甲酸雌二醇(EB)诱导慢性前列腺炎大鼠模型。36只SD大鼠随机分为空白组(生理盐水,4 mL·kg^(-1))、模型组(生理盐水,4 mL·kg^(-1))、阳性药物对照组(前列康片混悬液,4 mL·kg^(-1))、解毒活血汤低(4 mL·kg^(-1))、中(8mL·kg^(-1))、高剂量组(12 mL·kg^(-1)),每组6只,所有实验动物连续给药30 d。苏木精-伊红(HE)染色观察各组大鼠组织病理学变化;免疫组化法、RT-PCR、Western Blot技术检测相关炎症因子及蛋白表达水平。结果与正常对照组相比,慢性前列腺炎大鼠前列腺组织增生及水肿明显、炎症浸润增加,而阳性药物对照组及解毒活血汤各剂量组大鼠前列腺组织病变减轻或消失、炎症浸润减少,且与解毒活血汤剂量成正比;免疫组化表示模型组p38、P-p38、STAT3、P-STAT3表达较高,阳性药物对照组、不同剂量解毒活血汤组的p38、P-p38、STAT3、P-STAT3表达呈下降趋势,且均低于模型组。RT-PCR结果显示阳性药物对照组及解毒活血汤低、中、高剂量组均能降低大鼠前列腺组织中TNF-α、IL-2、IL-6的表达水平;Western Blot检测提示大鼠疾病发生进展过程中p38、P-p38、P-ERK1/2、STAT3、P-STAT3呈高表达状态,解毒活血汤能够降低其表达,从而降低相关炎症因子的过度激活。结论解毒活血汤能够抑制ERK/p38 MAPK信号通路的过度激活,从而降低IL-2、IL-6、TNF-α等炎症因子的表达,以改善前列腺组织炎症反应。 展开更多
关键词 解毒活血汤 Ⅲ型前列腺炎 ERK/p38 MAPK通路 毒瘀理论
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冯培民教授基于“六郁浊毒”论治慢性胃炎相关汗证经验 被引量:1
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作者 郑英伦 王秋雨 +2 位作者 郑攀攀 赵方 冯培民 《亚太传统医药》 2024年第3期99-102,共4页
冯培民教授基于“六郁浊毒”学说治疗慢性胃炎相关汗证辨治经验,认为本病以脾胃气虚为基础,气、血、痰、火、湿、食与五脏六腑结郁生汗,积生浊毒。因此,应见汗知著,立足于中州,治以三仁汤为基,行气清郁,加之清火泄浊、消食化浊、通瘀活... 冯培民教授基于“六郁浊毒”学说治疗慢性胃炎相关汗证辨治经验,认为本病以脾胃气虚为基础,气、血、痰、火、湿、食与五脏六腑结郁生汗,积生浊毒。因此,应见汗知著,立足于中州,治以三仁汤为基,行气清郁,加之清火泄浊、消食化浊、通瘀活血、补气滋阴等治法,为慢性胃炎相关汗证临床防治提供新思路。 展开更多
关键词 六郁学说 浊毒学说 慢性胃炎 汗证 临证经验
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Theoretical analysis of the double-differential cross-sections of neutron,proton,deuteron,^(3)He,andαfor the p+^(6) Li reaction
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作者 Fang-Lei Zou Xiao-Jun Sun +10 位作者 Jing-Shang Zhang Hai-Rui Guo Yin-Lu Han Rui-Rui Xu Xi Tao Ji-Min Wang Xiao-Dong Sun Yuan Tian Tao Ye Yong-Li Xu Chun-Tian Liang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2024年第3期181-197,共17页
Based on the unified Hauser–Feshbach and exciton model,which can describe the particle emission processes between discrete energy levels with energy,angular momentum,and parity conservations,a statistical theory of l... Based on the unified Hauser–Feshbach and exciton model,which can describe the particle emission processes between discrete energy levels with energy,angular momentum,and parity conservations,a statistical theory of light nucleus reaction(STLN)is developed to calculate the double-differential cross-sections of the outgoing neutron and light charged particles for the proton-induced^(6) Li reaction.A significant difference is observed between the p+^(6) Li and p+^(7) Li reactions owing to the discrepancies in the energy-level structures of the targets.The reaction channels,including sequential and simultaneous emission processes,are analyzed in detail.Taking the double-differential cross-sections of the outgoing proton as an example,the influence of contaminations(such as^(1) H,^(7)Li,^(12)C,and^(16)O)on the target is identified in terms of the kinetic energy of the first emitted particles.The optical potential parameters of the proton are obtained by fitting the elastic scattering differential cross-sections.The calculated total double-differential cross-sections of the outgoing proton and deuteron at E_(p)=14 MeV agree well with the experimental data for different outgoing angles.Simultaneously,the mixed double differential cross-sections of^(3) He andαare in good agreement with the measurements.The agreement between the measured data and calculated results indicates that the two-body and three-body breakup reactions need to be considered,and the pre-equilibrium reaction mechanism dominates the reaction processes.Based on the STLN model,a PLUNF code for the p+^(6) Li reaction is developed to obtain an ENDF-6-formatted file of the double-differential cross-sections of the nucleon and light composite charged particles. 展开更多
关键词 Statistical theory of light nucleus reaction p+^(6)Li reaction light composite charged particle Double-differential cross-sections Two-body breakup Three-body breakup
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翘曲板材三维重构及智能化压平的建模研究
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作者 马宝 马晓宝 +5 位作者 兰媛 任玉成 刘云飞 马彦芝 王荣军 江连运 《工程科学学报》 EI CSCD 北大核心 2024年第5期875-886,共12页
为提高板材压平质量和效率,实现智能化压平,本文采用结构光相机获取翘曲板材点云数据,进行点云分割、点云去噪和点云精简等预处理,利用最小二乘法拟合重构了翘曲板材的三维曲面.采用微分几何的曲面理论计算得到板材的翘曲曲率,提出基于... 为提高板材压平质量和效率,实现智能化压平,本文采用结构光相机获取翘曲板材点云数据,进行点云分割、点云去噪和点云精简等预处理,利用最小二乘法拟合重构了翘曲板材的三维曲面.采用微分几何的曲面理论计算得到板材的翘曲曲率,提出基于三维曲面特征的翘曲板材垫铁支点和压下点的优化方法,根据三点弯曲矫平理论得到了压力下和压下位移.翘曲板材三维轮廓的重构方法和翘曲曲率计算模型确定了垫铁位置和压下位置点优化原则,为翘曲板材智能化压平提供了理论模型.理论和实验的结果显示,重构的三维曲面与实际结果吻合,基于重构三维曲面数据计算的压平力与实测结果偏差大约为2.21%,初始平直度17.2 mm·m^(-1),压平矫直后减小为3.28 mm·m^(-1),结果准确,方法可行. 展开更多
关键词 板材压平 结构光视觉 三维曲面 矫直理论 有限元仿真
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基于鲁棒性主成分分析的低照度图像增强算法
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作者 胡乘其 王书朋 王瑜婧 《计算机应用与软件》 北大核心 2024年第2期244-249,共6页
由于低照度图像对比度和信噪比低,传统图像增强算法在提高图像对比度的同时容易造成噪声放大。针对该问题,提出基于鲁棒性主成分分析(RPCA)的低照度图像增强算法。算法依据Retinex理论将图像分解为照度分量和反射分量,使用伽马矫正对照... 由于低照度图像对比度和信噪比低,传统图像增强算法在提高图像对比度的同时容易造成噪声放大。针对该问题,提出基于鲁棒性主成分分析(RPCA)的低照度图像增强算法。算法依据Retinex理论将图像分解为照度分量和反射分量,使用伽马矫正对照度分量进行增强。将增强后的照度分量与反射分量合成为最终的增强图像。其中图像分解采用RPCA方法实现,因为该方法可以有效地将照度信息与噪声分离,从而避免增强照度分量时放大噪声。为了提高计算效率,算法采用非精确增广拉格朗日乘子法(Inexect-ALM,IALM)求解RPCA分解问题。实验结果表明,该算法在增强图像对比度的同时避免了放大噪声,其主观评价与客观指标都优于几种经典的图像增强算法,有较好的视觉效果和较低的计算复杂度。 展开更多
关键词 图像增强 低照度图像 RETINEX理论 鲁棒性主成分分析
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融合残差结构与注意力机制的暗光图像增强算法
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作者 刘瑶 贾晓芬 《重庆工商大学学报(自然科学版)》 2024年第4期86-96,共11页
目的低光工况或拍摄技巧影响都可能获得低光照图像,为解决此类图像对比度低、噪声大、颜色失真等问题,提出一种卷积神经网络增强模型RetKIND,包括分解网络、亮度调整网络和降噪网络。方法它借助残差模块(RB)和跳跃连接,有效抑制分解网... 目的低光工况或拍摄技巧影响都可能获得低光照图像,为解决此类图像对比度低、噪声大、颜色失真等问题,提出一种卷积神经网络增强模型RetKIND,包括分解网络、亮度调整网络和降噪网络。方法它借助残差模块(RB)和跳跃连接,有效抑制分解网络在分解时产生的噪声;融合U-Net架构、空洞卷积和EBAM高效注意力机制构建降噪网络,利用空洞卷积扩大感受野,提取更多图像信息,提高EBAM在通道和空间上提取反射图的细节、纹理、颜色等特征的能力,实现图像去噪;由UC(亮度调整网络中的自定义模块)和普通卷积组成亮度调整网络,旨在减少光照图细节缺失,提高光照分量对比度。融合去噪后的反射分量和增强后的光照分量,得到正常光照图像。结果仿真结果表明:在LOL数据集上,相较R2RNet,FPSNR和FSSIM值分别上升了6.2%和4.2%;相较URetinex-Net,FPSNR和FSSIM值分别上升了5.9%和1.2%;相较DEANet,FPSNR和FSSIM值分别上升了2.9%和1.1%。结论Ret-KIND模型既能提升图像亮度,又能降低图像的噪声,有助于推动低光图像增强模型应用到目标检测领域。 展开更多
关键词 低光照图像增强 去噪 RB残差模块 EBAM注意力机制 RETINEX理论
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