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电声学科的跨越特点和应用进展

应用声学 2007年第1期26卷 1-7页

作者：管善群北京邮电大学北京100876

本文综述了电声学科由于具有跨越科学与艺术两大领域和跨越多种学科的性质所带来的研究和应用特点,提出了几项近些年值得重视的应用领域和可能发展趋势,希望引起同仁讨论。鉴于我国在其中有些方面有突出成绩,本文将特别加以介绍,也希望... 详细信息

本文综述了电声学科由于具有跨越科学与艺术两大领域和跨越多种学科的性质所带来的研究和应用特点,提出了几项近些年值得重视的应用领域和可能发展趋势,希望引起同仁讨论。鉴于我国在其中有些方面有突出成绩,本文将特别加以介绍,也希望得到大家的关心。本文还有一个附带的期望：促进非电声学科的声学工作者了解和关心电声学科的核心。

关键词：电声头相关传输函数虚拟声乐器数字接口回声抵消音乐技术

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对我国扬声器研究与产业发展的建议之管见

应用声学 2007年第6期26卷 321-325页

作者：管善群北京邮电大学北京100876

据统计，我国已经是扬声器单元的生产大国。但是，我国多数扬声器产品还是处在低、中档技术含量的水平，生产厂的研究能力也还相当薄弱和缺乏战略安排，他们的产品开发也多是处在选料装配的状态。

关键词：扬声器单元产业发展产品开发技术含量研究能力生产厂

采用扬声器的虚拟声滤波器简化及其主观评价(英文)

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声学技术 2006年第6期25卷 547-554页

作者：谢菠荪张林山管善群张承云华南理工大学物理科学与技术学院声学研究所广州510641 北京邮电大学电信工程学院北京100876 广州大学信息与机电工程学院广州510006

对用扬声器的5.1通路环绕声虚拟重放系统的滤波器进行了简化,提出通过零极点的抵消可减少滤波器的脉冲响应长度。主观评价实验表明,在48kHz的采样频率下,采用128点(2.7ms)脉冲响应长度的滤波器进行处理可得到理想的主观听觉效果。采用64... 详细信息

对用扬声器的5.1通路环绕声虚拟重放系统的滤波器进行了简化,提出通过零极点的抵消可减少滤波器的脉冲响应长度。主观评价实验表明,在48kHz的采样频率下,采用128点(2.7ms)脉冲响应长度的滤波器进行处理可得到理想的主观听觉效果。采用64点(1.3ms)脉冲响应长度的滤波器会导致主观听觉效果略为下降,但实际中仍然可用。因而简化滤波器的脉冲响应长度较传统方法的5到10ms的量级要短,采用简单的FIR滤波器即可实现。

关键词：虚拟声环绕声头相关传输函数滤波器

发芽糙米特征营养、食味品质提升及功能性评价研究进展

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食品科学 2025年第1期46卷 284-292页

作者：任传英洪滨张珊袁迪冯俊然山珊张竞一管立军李波黄文功卢淑雯黑龙江省农业科学院食品加工研究所黑龙江省食品加工重点实验室黑龙江省全谷物营养食品工程技术研究中心黑龙江哈尔滨150086 黑龙江省农业科学院农产品质量安全研究所黑龙江哈尔滨150086

发芽糙米作为一种全谷物,保留了完整的皮层和胚,集中了大部分营养素和功能性活性物质,但由于皮层纤维结构致密,蒸饭过程中阻碍了吸水速率、吸水量和淀粉糊化,与大米相比,其蒸煮性和食用品质较差,且难以同煮同熟,因此一直以来未被广大消... 详细信息

发芽糙米作为一种全谷物,保留了完整的皮层和胚,集中了大部分营养素和功能性活性物质,但由于皮层纤维结构致密,蒸饭过程中阻碍了吸水速率、吸水量和淀粉糊化,与大米相比,其蒸煮性和食用品质较差,且难以同煮同熟,因此一直以来未被广大消费者接受。本文综述糙米发芽的生理代谢反应及发芽过程中营养成分、活性成分和食味品质的变化,总结发芽糙米胁迫富集γ-氨基丁酸(γ-aminobutyric acid,GABA)技术和发芽糙米的功能特性研究现状。糙米发芽过程中,多种生物活性物质在酶促反应下富集,尤其是特征成分GABA含量显著提升。多种逆境胁迫均可通过改变Ca^(2+)、H^(+)或底物水平促进GABA富集,一些预处理技术可进一步提升发芽糙米的食味品质。GABA与其他营养成分和活性成分发挥协同作用,赋予发芽糙米抗高血脂、抗高血糖、保护心脏、改善睡眠、抗炎和抗氧化等一系列功效与作用。

关键词：发芽糙米特征营养食味品质功能性

An Improved Ionospheric Delay Correction Method for SBAS

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Chinese Journal of Electronics 2021年第2期30卷 384-389页

作者： WANG shan WANG Ding guan Yingxuan China University of Mining and Technology-Beijing

The existing ionospheric delay correction methods in Satellite based augmentation system(SBAS)were just for single constellation and over *** this paper, we propose a new method to make more accurate ionospheric delay correction and tighter error bound orienting towards GPS and GLONASS. Considering that some Ionospheric pierce points(IPPs) are almost motionless, we make a filtering process to estimate the ionospheric delays at Ionospheric grid points(IGPs) to better reflect the ionospheric temporal variation. Then we conduct a simulation on ionospheric delay estimation at IGPs in dual constellations through planar fit method and filtering method. It can be concluded that the filtering method can bound the ionospheric delay correction error more tightly, simultaneously the ionospheric delay correction accuracy is improved a bit.

关键词： simultaneously the ionospheric delay correction accuracy existing ionospheric delay correction methods single constellation satellite navigation ionospheric delay correction error ionospheric temporal variation Global Positioning System ionospheric electromagnetic wave propagation SBAS tighter error bound orienting accurate ionospheric delay correction ionospheric delays ionospheric delay estimation filtering method ionospheric techniques Ionospheric pierce points Ionospheric grid points improved Ionospheric delay correction method Satellite based augmentation system ionosphere planar fit method delays delay estimation

Analytically Derived Wind Wave Growth Relations

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China Ocean Engineering 2002年第3期17卷 359-368页

作者： guan Changlong(管长龙) SUN qun(孙群) Physical Oceanography Laboratory and Institute of Physical Oceanography Ocean University of Qingdao Qingdao 266003 China Physical Oceanography Laboratory and Institute of Physical Oceanography Ocean University of Qingdao Qingdao 266003 China

By the use of the 3/2 power law presented by Toba combined with the significant wave energy balance equation for wind wave, wind wave growth at a limited fetch is analytically investigated. The new wind wave growth relations (WWGRs) are analytically derived with sheltering coefficient and wind drag coefficient as parameters. The geometrical average of observational values of sheltering coefficient and the arithmetic average of observational values of wind drag coefficient are applied to determine the new WWGRs. Comparisons with existing empirical WWGRs are made.

关键词： wind wave wind wave growth relation 3/2 power law

Large Deviations in Generalized Random Graphs with Node Weights

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Acta Mathematica Sinica,English Series 2018年第10期34卷 1626-1634页

作者： qun LIU Zhi shan DONG Mathematics School and Institute of Jilin University

Generalized random graphs are considered where the presence or absence of an edge de- pends on the weights of its nodes. Our main interest is to investigate large deviations for the number of edges per node in such a generalized random graph, where the node weights are deterministic under some regularity conditions, as well as chosen i.i.d, from a finite set with positive components. When the node weights are random variables, obstacles arise because the independence among edges no longer exists, our main tools are some results of large deviations for mixtures. After calculating, our results show that the corresponding rate functions for the deterministic case and the random case are very different.

关键词： Large deviations mixture generalized random graphs

Flexible High Energy Density Sodium Dual-ion Battery with Long Cycle life

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Energy & Environmental Materials 2022年第4期5卷 1285-1293页

作者： Yongpeng Li qun guan Jianli Cheng Bin Wang Institute of Chemical Materials China Academy of Engineering PhysicsMianyang 621900China Institute of Fundamental and Frontiers Sciences Yangtze Delta Region Institute(Huzhou)University of Electronic Sciences and Technology of ChinaChengdu 611731China

Flexible fiber-shaped sodium dual-ion batteries(FSDIBS)as a proof of concept are fabricated by using the hierarchical ReS_(2) nanosheets anchored on the carbon nanotube(ReS_(2)@CNT)fiber as anode and graphite on the CNT as *** to large interlayer spacing and weak layer coupling force of the ReS_(2) nanosheets and the anion accommodation of the graphite combined with good flexibility of the CNT fiber,the FSDIBS demonstrate outstanding electrochemical performances with high working voltage and high specific volumetric energy density,durable cycling life,and good *** FSDIBS show a specific discharge capacity of 97.8 mAh cm^(−3) at a current density of 630 mA cm^(−3) and high specific energy density of 25.12 mWh cm^(−3)(based on the whole volume of the two electrodes)and superb stability with a capacity retention of 91.8%even after bending for 2100 ***,a series of ex situ/in situ characterizations are verified that the reversible shuttles of the Na^(+) cations and PF_(6)^(-) anions between the anode and cathode are simultaneously occurred during the charge/discharge process.

关键词： dual-ion batteries fiber-shaped flexibility ReS_(2) sodium ions

On large action space in EV charging scheduling optimization

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Science China(Information Sciences) 2022年第2期65卷 45-60页

作者： Zhaoyu JIANG Qing-shan JIA Xiaohong guan Center for Intelligent and Networked Systems Beijing National Research Center for Information Science and Technology Department of Automation Tsinghua University MOE KLINNS Lab Xi'an Jiaotong University

In order to reduce the air pollution by traditional fossil fuel and save the charging cost, much attention has been paid to the charging scheduling of electric vehicles(EVs) in the uncertain supplement of wind power and solar power. Owing to the randomness in the renewable power generation and the EV charging demand, simulation-based policy improvement(SBPI) has been well adopted for making charging decision. However, it is challenging to explore the large action space which grows exponentially with respect to the system scale. We consider this important problem in this paper and make the following ***, we explore the structural property of the problem and develop an urgency index to rank the ***, we apply three methods to search in the action space. Third, we numerically demonstrate the performance of the urgency index and the search methods, and compare the SBPI methods with the CPLEXbased method. It shows that SBPI improves the base policies in all these cases.

关键词： EV simulation-based policy improvement large action space sampling

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