检索结果-南通市图书馆

基于RSD的脉冲发生器破碎岩混材料实验仿真

在线全文

学校读者我要写书评

暂无评论

电子科技 2015年第5期28卷 53-56页

作者：李宏达李欣 Alexander GLyublinsky sergey v Korotkov 赵红阳车龙沈阳理工大学装备工程学院辽宁沈阳110168 清华大学机械系北京100084 Ioffe Physical Technical Institute

为了总结用于破碎岩混材料的脉冲发生器其设计原则和规律。通过应用一种反向晶体管开关,研制脉冲发生器进行破碎岩混材料实验,并结合CST软件对电极放电过程进行仿真,确定脉冲发生器的最佳参数。经研究发现,基于RSD脉冲发生器的输出脉冲... 详细信息

为了总结用于破碎岩混材料的脉冲发生器其设计原则和规律。通过应用一种反向晶体管开关,研制脉冲发生器进行破碎岩混材料实验,并结合CST软件对电极放电过程进行仿真,确定脉冲发生器的最佳参数。经研究发现,基于RSD脉冲发生器的输出脉冲可高效破碎岩混材料,其具有安全可控无污染的优点,有望代替炸药爆破方式。

关键词：高压脉冲反向晶体管开关脉冲功率系统

37ka以来日本海沉积物有机质碳和氮稳定同位素变化及其古海洋学意义

在线全文

学校读者我要写书评

暂无评论

地学前缘 2022年第4期29卷 123-135页

作者：邹建军宗娴朱爱美豆汝席林锦辉冯旭光董智 sergey A.GORBARENKO 郑立伟石学法自然资源部第一海洋研究所海洋地质与成矿作用重点实验室山东青岛266061 青岛海洋科学与技术试点国家实验室海洋地质过程与环境功能实验室山东青岛266237 俄罗斯科学院远东分院太平洋海洋研究所俄罗斯符拉迪沃斯托克690041 海南大学南海海洋资源利用国家重点实验室海南海口570000

海洋沉积物有机质碳氮稳定同位素(δ^(13)C、δ^(15)N)广泛用于有机质来源示踪、古生产力和古海洋环境重建。日本海沉积物δ^(13)C和δ^(15)N值一个显著特征是在末次冰盛期(LGM)同步负偏,但是对这一现象产生的原因以及他们的演化过程的... 详细信息

海洋沉积物有机质碳氮稳定同位素(δ^(13)C、δ^(15)N)广泛用于有机质来源示踪、古生产力和古海洋环境重建。日本海沉积物δ^(13)C和δ^(15)N值一个显著特征是在末次冰盛期(LGM)同步负偏,但是对这一现象产生的原因以及他们的演化过程的认识仍然存在明显不足。在本研究中,我们详细调查了37 ka以来日本海中部Lv53-23-1岩心沉积物δ^(13)C和δ^(15)N演化历史。结果显示,沉积物δ^(13)C和δ^(15)N分别介于-26.3‰至-22.5‰和1.6‰至6.1‰,低值出现在LGM(26.5~17 ka)暗色层状泥发育时期,指示较强的陆源输入贡献。在Heinrich冰阶1时期(17~14.5 ka),δ^(13)C和δ^(15)N快速正偏,表明日本海海洋环境发生了明显的转换,对应于对马海峡淹没及对马暖流入侵。14.5 ka之后,沉积物δ^(15)N值恢复到5‰,与开阔大洋海水硝酸盐的δ^(15)N值近似。我们采用二端员混合模型粗略地估算了有机质来源的相对贡献。LGM时期陆源有机质贡献介于65%至80%,14.5 ka以后海源有机质贡献介于60%至80%。除了增加的陆源有机质贡献以外,LGM时期沉积物δ^(15)N亏损还涉及如下过程:(1)较高的含Fe沙尘供给提高日本海表层海洋生物固氮效率;(2)缺氧环境盛行减弱成岩作用对沉积物δ^(15)N影响。37 ka以来,日本海沉积物δ^(13)C和δ^(15)N变化与有机质来源、营养盐的供给、表层生产力和沉积物氧化还原条件相关,实际受海平面和全球气候制约。

关键词：碳氮稳定同位素沉积物有机质来源海平面末次冰期日本海

Generation of dual and quad‑optical frequency combs in the injected radiation free mode‑locked frequency‑shifted feedback laser

在线全文

学校读者我要写书评

暂无评论

Frontiers of Optoelectronics 2023年第3期16卷 43-56页

作者： sergey N.Mantsevich Ekaterina I.Kostyleva Andrey N.Danilin vladimir S.Khorkin Physics Department M.V.Lomonosov Moscow State UniversityMoscow 119991Russia Russian Quantum Center(RQC) Skolkovo 143026Russia

The results of an optoelectronic system—frequency-shifted feedback(FSF)laser experimental examination are *** considered FSF laser is seeded only with optical amplifer spontaneous emission(ASE)and operates in the mode-locked regime,whereby the output radiation is sequence of short pulses with a repetition rate determined by the delay time in its optical feedback *** the frequency domain,the spectrum of such a pulse sequence is an optical frequency comb(OFC).These OFCs we call *** consider the possibility of tunable acousto-optic(AO)dual and quad-comb frequency spacing downconversion in the FSF laser seeded with ASE and operating in the mode-locked *** examined system applies a single frequency shifting loop with single AO tunable flter as the frequency shifter that is fed with several radio frequency signals *** initial OFCs with frequency spacing of about 6.5 MHz may be obtained in the wide spectral range and their width,envelope shape and position in the optical spectrum may be *** dual-combs are obtained with a pair of initial OFCs aroused by two various ultrasound waves in the acousto-optic tunable flter(AOTF).The dual-combs frequency spacing is determined by the frequency diference of the signals applied to the AOTF piezoelectric transducer and can be tuned *** quad-combs are obtained with three initial OFCs,forming a pair of dual-combs,appearing when three ultrasound frequencies feed the AOTF *** quad-combs frequency spacing is defned by the diference between the frequency spacing of ***-combs with more than 5000 spectral lines and tunable frequency spacing are *** successive frequency downconversion gives the possibility to reduce the OFC frequency spacing form several MHz for initial OFC to tens of kHz for quad-combs.

关键词： Frequency-shifted feedback laser Optical frequency combs Acousto-optics Dual-combs Quad-combs

ITO-free silicon-integrated perovskite electrochemical cell for light-emission and light-detection

在线全文

学校读者我要写书评

暂无评论

Opto-Electronic Advances 2023年第9期6卷 45-58页

作者： Maria Baeva Dmitry Gets Artem Polushkin Aleksandr vorobyov Aleksandr Goltaev vladimir Neplokh Alexey Mozharov Dmitry vKrasnikov Albert GNasibulin Ivan Mukhin sergey Makarov Alferov University Khlopina 8/3St.Petersburg 194021Russia Department of Physics and Engineering ITMO UniversityLomonosova 9St.Petersburg 197101Russia Institute of Automation and Control Processes(IACP) Far Eastern Branch of Russian Academy of SciencesUlitsa Radio 5Vladivostok 690041Primorsky KraiRussia Peter the Great St.Petersburg Polytechnic University Polytechnicheskaya 29St.Petersburg 195251Russia Skolkovo Institute of Science and Technology Nobel 3Moscow 121205Russia Qingdao Innovation and Development Center Harbin Engineering UniversityQingdao 266000China.

Halide perovskite light-emitting electrochemical cells are a novel type of the perovskite optoelectronic devices that differs from the perovskite light-emitting diodes by a simple monolayered ***,we develop a perovskite electrochemical cell both for light emission and detection,where the active layer consists of a composite material made of halide perovskite microcrystals,polymer support matrix,and added mobile *** perovskite electrochemical cell of CsPbBr3:PEO:LiTFSI composition,emitting light at the wavelength of 523 nm,yields the luminance more than 7000 cd/m2 and electroluminescence efficiency of 4.3 lm/*** device fabricated on a silicon substrate with transparent single-walled carbon nanotube film as a top contact exhibits 40%lower Joule heating compared to the perovskite optoelectronic devices fabricated on conventional ITO/glass ***,the device operates as a photodetector with a sensitivity up to 0.75 A/W,specific detectivity of 8.56×1011 Jones,and linear dynamic range of 48 *** technological potential of such a device is proven by demonstration of 24-pixel indicator display as well as by successful device miniaturization by creation of electroluminescent images with the smallest features less than 50μm.

关键词： composite inorganic halide perovskite silicon single walled carbon nanotubes light-emitting electrochemical cell photodetector indicator display

Evaluation of Natural Radioactivity Levels for Structural Material Used in the Construction of the Neutrino Detector

在线全文

学校读者我要写书评

暂无评论

World Journal of Nuclear Science and Technology 2015年第1期5卷 43-56页

作者： vladimir G. Zinovyev Anatolii P. Serebrov Ivan A. Mitropolsky Yuriy E. Loginov Georgiy I. Shulyak Tatyana M. Tyukavina sergey L. Sakharov Anatoly v. Chernyj Neutron Research Department National Research Centre “Kurchatov Institute” B.P. Konstantinov Petersburg Nuclear Physics Institute Gatchina Russia

In this work, the evaluation of natural radioactivity and spontaneous fission rates was performed for 8 nuclides from the natural radioactive 238U, 235U and 232Th decay chains. For this purpose, three samples of structural materials of the neutrino detector, i.e. aluminum, titanium and glass were analyzed by gamma spectroscopy and by neutron activation analysis to quantify a specific radioactivity of the samples. According to the results of this investigation, glass and aluminum samples have maximum values of the mean uranium concentrations 7.3(7) × 10-4% and 3.1(6) × 10-5%, respectively, while the lowest value for mean concentration of the uranium was found in titanium samples to be 4.7(3) × 10-6%. Aluminum sample had maximum values of the mean thorium concentrations, 2.5(8) × 10-3%, while the lowest value for mean concentration of the thorium was found in titanium samples to be 6.2(3) × 10-7%.

关键词： Spontaneous Fission Radioactive Decay Chain α-Decay Radionuclide Branching Factor

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

3万年以来日本海西部海冰活动变化

第四纪研究 2020年第3期40卷 690-703页

作者：豆汝席邹建军石学法朱爱美董智石丰登薛心如 Gorbarenko sergey 自然资源部第一海洋研究所海洋地质与成矿作用重点实验室山东青岛266061 青岛海洋科学与技术试点国家实验室海洋地质过程与环境功能实验室山东青岛266237 俄罗斯科学院远东分院太平洋海洋研究所俄罗斯符拉迪沃斯托克690041

海冰是现代气候系统的一个基本组成要素,对气候变化有着重要的调控作用。现今日本海西部仍发育有限的季节性海冰,也是深层水形成的关键区域。由于缺乏沉积岩芯,长期以来对日本海西部海冰范围变化的历史还缺乏深入的认识。本文对日本海西... 详细信息

海冰是现代气候系统的一个基本组成要素,对气候变化有着重要的调控作用。现今日本海西部仍发育有限的季节性海冰,也是深层水形成的关键区域。由于缺乏沉积岩芯,长期以来对日本海西部海冰范围变化的历史还缺乏深入的认识。本文对日本海西部Lv53-18-2岩芯中长393 cm的沉积物进行了粒度分析,采用粒径端元分析方法,重建了过去30.0~5.0 ka海冰和底流活动历史。粒径端元(EM)分析显示,端元3(40~160μm)是指示海冰活动的有效指标;EM1(2~20μm)与可分选粉砂平均粒径呈现一致的变化趋势,是指示底流活动的有效指标,但在15.0~7.8 ka受到冰筏碎屑影响。日本海西部海冰活动由冬季海冰形成和春/夏季海冰融化条件的共同制约。末次冰期-冰盛期(30.0~18.0 ka),在强盛东亚冬季风(EAWM)和低太阳辐射量控制下,日本海西部季节性海冰活动保持微弱;在末次冰消期晚期-中全新世早期(15.0~7.8 ka),EAWM仍然强盛,同时北半球高纬日射量和海平面升高,导致海冰活动十分活跃;7.8~5.0 ka以来,随着EAWM减弱和对马暖流入侵,日本海西部季节性海冰活动显著减弱。在海因里希冰阶(HS)1时段(17.5~15.0 ka),大西洋经向翻转流减弱诱发EAWM增强,同时北半球夏季太阳辐射量和海平面都相对较低,可能导致日本海西部海冰持续覆盖。在季节性海冰形成时期,盐析过程增强了水体垂向对流和底流活动,但是在HS1,深层水体形成源区被常年海冰覆盖,抑制了深层水形成,减弱了研究区底流活动。

关键词：海冰底流活动粒径端元分析可分选粉砂末次冰期日本海

Ultrafast Optomechanical Terahertz Modulators Based on Stretchable Carbon Nanotube Thin Films

在线全文

学校读者我要写书评

暂无评论

Ultrafast Science 2023年第6期3卷 1-9页

作者： Maksim I.Paukov vladimir v.Starchenko Dmitry v.Krasnikov Gennady A.Komandin Yuriy G.Gladush sergey S.Zhukov Boris P.Gorshunov Albert G.Nasibulin Aleksey v.Arsenin valentyn S.volkov Maria G.Burdanova Center for Photonics and 2D Materials Moscow Institute of Physics and TechnologyDolgoprudny.Russia Skolkovo Institute of Science and Technology MoscowRussia Prokhorov General Physics Institute of the Russian Academy of Sciences MoscowRussia Laboratory of Advanced Functional Materials Yerevan State UniversityYerevanArmenia Institute of Solid State Physics of the Russian Academy of Sciences ChernogolovkaRussia.

For terahertz wave applications,tunable and rapid modulation is highly *** studied by means of optical pump-terahertz probe spectroscopy,single-walled carbon nanotube(SWCNT)thin films demonstrated ultrafast carrier recombination lifetimes with a high relative change in the signal under optical excitation,making them promising candidates for high-speed ***,combination of SWCNT thin films and stretchable substrates facilitated studies of the SWCNT mechanical properties under strain and enabled the development of a new type of an optomechanical *** applying a certain strain to the SWCNT films,the effective sheet conductance and therefore modulation depth can be fine-tuned to optimize the designed *** exhibited a photoconductivity change of approximately 2 times of magnitude under the strain because of the structural modification in the SWCNT *** was used to control the terahertz signal with a modulation depth of around 100%without strain and 65%at a high strain operation of 40%.The sensitivity of modulators to beam polarization is also shown,which might also come in handy for the design of a stretchable *** results give a fundamental grounding for the design of high-sensitivity stretchable devices based on SWCNT films.

关键词： strain excitation films

末次冰盛期以来鄂霍次克海北部陆架的海冰变化

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

海洋学报 2023年第5期45卷 1-13页

作者：姜雪蛟王昆山董智邹建军刘季花李贞 sergey Gorbarenko Alexander Bosin 石学法自然资源部第一海洋研究所自然资源部海洋地质与成矿作用重点实验室山东青岛266061 青岛海洋科学与技术试点国家实验室海洋地质过程与环境功能实验室山东青岛266237 俄罗斯科学院远东分院太平洋海洋研究所滨海边疆区符拉迪沃斯托克690041

本文通过高分辨率粒度分析,研究了鄂霍次克海北部陆架Lv87-54-1岩芯记录的海冰活动历史。利用AnalySize程序对粒度数据进行端元分析,提取了3个端元,并将EM3作为海冰指标。EM3含量结果表明,末次冰盛期以来鄂霍次克海北部陆架以活动性海... 详细信息

本文通过高分辨率粒度分析,研究了鄂霍次克海北部陆架Lv87-54-1岩芯记录的海冰活动历史。利用AnalySize程序对粒度数据进行端元分析,提取了3个端元,并将EM3作为海冰指标。EM3含量结果表明,末次冰盛期以来鄂霍次克海北部陆架以活动性海冰覆盖为主。末次冰盛期和海因里希冰阶1期(HS 1)时EM3含量最高,指示海冰活动强烈。冰期时北半球中高纬度气候变冷与北极涛动负相位是导致海冰大规模扩张的主要控制机制,东亚夏季风减弱与黑龙江入海径流量的减少促使鄂霍次克海生成更多的海冰。自波令-阿勒罗德间冰阶开始以来,鄂霍次克海北部陆架海冰生成急剧减少,在新仙女木时期海冰曾出现微弱峰值,随后又快速下降。自全新世以来,受北半球中高纬度气候变暖、秋季太阳辐射量升高、北极涛动正相位和东亚夏季风的增强共同影响,EM3含量一直稳定在较低水平,鄂霍次克海海冰的生成受到明显抑制。

关键词：冰筏碎屑粒度分析端元分析海冰变化鄂霍次克海

Intelligent Robust Control of Redundant Smart Robotic Arm Pt I: Soft Computing KB Optimizer - Deep Machine Learning IT

在线全文

学校读者我要写书评

暂无评论

Artificial Intelligence Advances 2020年第1期2卷 31-58页

作者： Alena v.Nikolaeva sergey v.Ulyanov Dubna State University Universitetskaya Str.19DubnaMoscow Region141980Russia ISESYS LLC(EFKO GROUP) Naberezhnaya Ovchinnikovskaya Str.20 Bld.2MoscowRussia

Redundant robotic arm models as a control object *** of computational intelligence IT on soft computing optimizer of knowledge base in smart robotic manipulators *** computing optimizer is the sophisticated computational intelligence toolkit of deep machine learning SW platform with optimal fuzzy neural network *** methods for development and design technology of control systems based on soft computing introduced in this Part 1 allow one to implement the principle of design an optimal intelligent control systems with a maximum reliability and controllability level of a complex control object under conditions of uncertainty in the source data,and in the presence of stochastic noises of various physical and statistical *** knowledge bases formed with the application of soft computing optimizer produce robust control laws for the schedule of time dependent coefficient gains of conventional PID controllers for a wide range of external perturbations and are maximally insensitive to random variations of the structure of control *** robustness is achieved by application a vector fitness function for genetic algorithm,whose one component describes the physical principle of minimum production of generalized entropy both in the control object and the control system,and the other components describe conventional control objective functionals such as minimum control error,*** application of soft computing technologies(Part I)for the development a robust intelligent control system that solving the problem of precision positioning redundant(3DOF and 7 DOF)manipulators *** of quantum soft computing in robust intelligent control of smart manipulators in Part II described.

关键词： Intelligent control system Knowledge base Soft computing technology Decomposition Redundant robotic manipulator