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Adaptive Algorithm for Accelerating Direct Isosurface Rendering on GPU

Journal of Electronic Science and Technology 2018年第3期16卷 222-231页

作者： Sergey Belyaev pavel smirnov Vladislav Shubnikov Natalia smirnova the Department of Applied Mathematics Institute of Applied Mathematics and MechanicsPeter the Great St.Petersburg Polytechnic UniversitySt.Petersburg 195251 EPAM Systems Inc. Newtown PA 18940

Direct isosurface volume rendering is the most prominent modern method for medical data *** is based on finding intersection points between the rays corresponding to pixels on the screen and isosurface. This article describes a two-pass algorithm for accelerating the method on the graphic processing unit(GPU). On the first pass, the intersections with the isosurface are found only for a small number of rays, which is done by rendering into a lower-resolution texture. On the second pass, the obtained information is used to efficiently calculate the intersection points of all the other. The number of rays to use during the first pass is determined by using an adaptive algorithm, which runs on the central processing unit(CPU) in parallel with the second pass of the rendering. The proposed approach allows to significantly speed up isosurface visualization without quality loss. Experiments show acceleration up to 10 times in comparison with a common ray casting method implemented on GPU. To the authors’ knowledge, this is the fastest approach for ray casting which does not require any preprocessing and could be run on common GPUs.

关键词： Adaptive algorithms isosurface rendering ray casting volume visualization

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一级相变时的红外特征辐射—熔融结晶和蒸气冷凝或沉淀

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物理学报 2013年第7期62卷 561-567页

作者： Tatartchenko Vitali 刘一凡吴勇周健杰孙大伟袁军朱枝勇 smirnov pavel Rusanov Artem 牛沈军李东振宗志远陈晓飞上海中电振华晶体技术有限公司上海201210

本文报道了一种新的物理现象—一级相变时(熔融结晶,蒸气冷凝或沉淀)的红外特征辐射.实验结果根据相应的理论模型来进行分析.此理论模型是基于一个论断,那就是粒子(原子,分子,团簇)从高能级亚稳态(气态或液态)向低能级稳态(液态或结晶态... 详细信息

本文报道了一种新的物理现象—一级相变时(熔融结晶,蒸气冷凝或沉淀)的红外特征辐射.实验结果根据相应的理论模型来进行分析.此理论模型是基于一个论断,那就是粒子(原子,分子,团簇)从高能级亚稳态(气态或液态)向低能级稳态(液态或结晶态)相变时释放出一个或多个光子.这些光子的能量取决于相变潜热和新相粒子的结合特性.对所有研究过的物质来说,这种能量集中在红外区.这就是为什么这种辐射被称作红外特征辐射.在雾和云的形成过程中,水发生了结晶、冷凝、升华,从而产生了大量红外辐射留在了大气中.因而,该研究的结果必然对大气现象有很重要的影响:它是地球冷却的因素之一;冰雹云的形成伴随着强烈的红外辐射,这种辐射可用来表征高能相转化为低能相的过程,可以作为一种气象预警.红外特征辐射似乎可以用来解释木星的呈红色现象.它可以用于大气储能,就此,继风能、水能、太阳能、地热能后,红外特征辐射成为生态学上第五种纯净的能源.

关键词：熔体结晶蒸气结晶特鲁藤规则大气蓄能

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Highly efficient transient stimulated Raman scattering on secondary vibrational mode of BaWO_(4) crystal due to its constructive interference with self-phase modulation

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Chinese Optics Letters 2023年第3期21卷 113-117页

作者： Igor Kinyaevskiy Valeri Kovalev pavel Danilov Nikita smirnov Sergey Kudryashov Andrey Koribut Andrey Ionin P.N.Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991Russia

An exceptionally high stimulated Raman scattering[SRS]conversion efficiency to the first Stokes component associated with the secondary[low-frequency and low intensity]vibrational mode v2[~330 cm^[-1]]was observed in a BaWO4 crystal in a highly transient regime of *** effect takes place in the range of pump pulse energy from~0.1 to~0.5μJ with maximum energy conversion efficiency up to 35%at 0.2μ*** nature of the observed effects is explained by interference of SRS and self-phase modulation,where the latter is related to a noninstantaneous orientational Kerr nonlinearity in the BaWO4 crystal.

关键词： stimulated Raman scattering secondary vibrational mode self-phase modulation ultrashort laser pulses transient phenomena

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First Order Phase Transitions as Radiation Processes, Part Two

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Optics and Photonics Journal 2014年第2期4卷 26-37页

作者： Vitali A. Tatartchenko pavel V. smirnov Hongrong Jin Shanghai CEC ZhenHua Crystal Technology Co. Ltd. Shanghai China

This paper presents new experimental results concerning the PeTa effect—infrared characteristic radiation under first order phase transitions, especially during deposition and condensation of vapours/gases and the crystallisation of melts. The abbreviation “PeTa effect” means Perel’man-Tatartchenko’s effect. The nature of the PeTa effect is transient radiation that a particle (i.e., atom, molecule or/and cluster) emits during a transition from a meta-stable higher energetic level (in a super-cooled melt or super-saturated vapour) to the stable condensed lower level (in a crystal or liquid). The radiation removes latent heat with photons of characteristic frequencies that are generated under this transition. This paper is the second in a set describing the appearance of PeTa radiation under air cooling with deposition and condensation of air components. The radiation was recorded using an IR Fourier Spectrometer with a highly sensitive MCT detector. Certain peculiarities of the recorded radiation as well as its applications in the physics of the atmospheres of Earth and Jupiter are analysed.

关键词： PeTa Effect First Order Phase Transitions Vapour Condensation Vapour Deposition Melt Crystallisation Infrared Radiation Atmospheric Phenomena Igloo Effect Jupiter

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First Order Phase Transitions as Radiation Processes

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Optics and Photonics Journal 2013年第8期3卷 1-12页

作者： Vitali A. Tatartchenko pavel V. smirnov Yong Wu Shanghai CEC Zhenhua Crystal Technology Co. Ltd. Shanghai China

This paper presents new experimental evidence of the PeTa effect—infrared characteristic radiation under first order phase transitions, especially the crystallization of melts and the deposition and condensation of vapours/gases. The PeTa effect describes the transient radiation that a particle (i.e., atom, molecule or/and cluster) emits transient radiation during a transition from a meta-stable higher energetic level (in a super-cooled melt or a super-saturated vapour) to the stable condensed lower level (in a crystal or a liquid). The radiation removes latent heat with photons of characteristic frequencies that are generated under this transition. The abbreviation “PeTa effect” means Perel’man-Tatartchenko’s effect.

关键词： Peta Effect First Order Phase Transitions Vapour Condensation Vapour Deposition Melt Crystallization Infrared Radiation Atmospheric Phenomena

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Preventive effect of a pectic polysaccharide of the common cranberry Vaccinium oxycoccos L. on acetic acid-induced colitis in mice

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World Journal of Gastroenterology 2006年第41期12卷 6646-6651页

作者： Sergey V Popov pavel A Markov Ida R Nikitina Sergey Petrishev Vasily smirnov Yury S Ovodov Department of Molecular Immunology and Biotechnology Institute of PhysiologyKomi Science CentreThe Urals Branch of the Russian Academy of Sciences50 Pervomaiskaya str.Syktyvkar 167982Russia

AIM： To study isolation and chemical characterization of pectin derived from the common cranberry Vaccin/um oxycoccos L. （oxycoccusan OP） and the testing of its preventive effect on experimental colitis. METHODS： Mice were administrated orally with OP two days prior to a rectal injection of 5% acetic acid and examined for colonic damage 24 h later. Colonic inflammation was characterized by macroscopical injury and enhanced levels of myeloperoxidase activity measured spectrophotometrically with o-phenylene diamine as the substrate. The mucus contents of the colon were determined by the Alcian blue dye binding method. Vascular permeability was estimated using 4% Evans blue passage after i.p. injection of 0.05 mol/L acetic acid. RESULTS： In the mice treated with OP, colonic macroscopic scores （1.1 ± 0.4 vs 2.7, P 〈 0.01） and the total square area of damage （10 ± 2 vs 21 ± 7, P 〈 0.01） were significantly reduced when compared with the vehicle-treated colitis group. OP was shown to decrease the tissue myeloperoxidase activity in colons （42 ± 11 vs 112 ± 40, P 〈 0.01） and enhance the amount of mucus of colitis mice （0.9 ± 0.1 vs 0.4 ± 0.1, P 〈 0.01）. The level of colonic malondialdehyde was noted to decrease in OP-pretreated mice （3.6 ± 0.7 vs 5.1 ± 0.8, P 〈 0.01）. OP was found to decrease the inflammatory status of mice as was determined by reduction of vascular permeability （161 ± 34 vs 241 ± 21, P 〈 0.01）. Adhesion of peritoneal neutrophils and macrophages was also shown to decrease after administration of OP （141 ± 50 vs 235 ± 37, P 〈 0.05）. CONCLUSION： Thus, a preventive effect of pectin from the common cranberry, namely oxycoccusan OP, on acetic acid-induced colitis in mice was detected. A reduction of neutrophil infiltration and antioxidant action may be implicated in the protective effect of oxycoccusan.

关键词： Common cranberry Vaccinium oxycoccos L Pectin Colitis Anti-inflammatory Mice

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