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2024年1月23日乌什M_(S)7.1地震序列b值随时间演化特征

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地震地磁观测与研究 2024年第3期45卷 9-15页

作者：翟娟洪德全周康云田雨桐赵梦强杨震朱亮淮南市地震局安徽232001 安徽省地震局合肥230031 哈密地震监测中心站新疆维吾尔自治区839000

选取2024年1月23日乌什M_(S)7.1地震序列目录,利用最大似然法计算该地震序列b值大小,分析震中区b值随时间的演化特征,得到以下认识:①震中区b值在强余震前呈明显下降变化特征,但无法准确评估b值下降后强余震的发生次数;②b值能够反映研... 详细信息

选取2024年1月23日乌什M_(S)7.1地震序列目录,利用最大似然法计算该地震序列b值大小,分析震中区b值随时间的演化特征,得到以下认识:①震中区b值在强余震前呈明显下降变化特征,但无法准确评估b值下降后强余震的发生次数;②b值能够反映研究区不同时间的应力水平,对强余震的预测具有一定指示意义。

关键词：乌什M_(S)7.1地震序列 b值最大似然法时间演化特征

Process Intensifi cation by CO_(2)for High Quality Carbon Nanotube Forest Growth:Double-Walled Carbon Nanotube Convexity or Single-Walled Carbon Nanotube Bowls?

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Nano Research 2009年第11期2卷 872-881页

作者： Jiaqi Huang Qiang Zhang mengqiang zhao Fei Wei Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Introduction of CO_(2)is a facile way to tune the growth of vertically aligned double-or single-walled carbon nanotube(CNT)forests on *** the absence of CO_(2),a double-walled CNT convexity was *** increasing concentration of CO_(2),the morphologies of the forests transformed first into radial blocks,and finally into bowl-shaped ***,the wall number and diameter distribution of the CNTs were also modulated by varying the amount of CO_(2).With increasing CO_(2)concentration,CNTs with fewer wall number and smaller diameter were *** addition of CO_(2)is speculated to generate water and serve as a weak oxidant for high quality CNT *** can tune the growth rate and the morphologies of the forests,prevent the formation of amorphous carbon,and reduce the wall number of the CNTs.

关键词： Carbon nanotube forest carbon dioxide chemical vapor deposition self organization process intensification

A review of the large-scale production of carbon nanotubes:The practice of nanoscale process engineering

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Chinese Science Bulletin 2012年第2期57卷 157-166页

作者： HUANG JiaQi ZHANG Qiang zhao mengqiang WEI Fei Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Carbon nanotubes(CNTs) are nanomaterials that have attracted great research interest because of their unique properties and promising *** controllable synthesis of CNTs is a precondition for their broad *** this review,we consider nanoscale process engineering and assess recent progress in the mass production of ultra-long,inexpensive CNTs with good alignment as well as tunability in wall number and diameter for fundamental and engineering science applications across multiple ***-edge nanoscale process engineering research in the areas of physics,chemistry,materials,engineering,ecology,and social science will allow us to obtain high added value and multi-functional advanced *** synthesis of CNTs with controllable chirality,good-alignment,and predetermined sizes and lengths still presents great *** multidisciplinary scientific research,advanced CNT-based materials will promote the development of a sustainable society.

关键词：碳纳米管工程实践大规模生产纳米工艺纳米材料科学应用社会科学可持续发展

Carbon nanotubes for supercapacitors:Consideration of cost and chemical vapor deposition techniques

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Journal of Natural Gas Chemistry 2012年第3期21卷 233-240页

作者： Chao Zheng Weizhong Qian Chaojie Cui Guanghui Xu mengqiang zhao Guili Tian Fei Wei Department of Chemical Engineering Tsinghua UniversityBeijing 100084China

In this topic, we first discussed the requirement and performance of supercapacitors using carbon nanotubes （CNTs） as the electrode, including specific surface area, purity and cost. Then we reviewed the preparation technique of single wailed CNTs （SWNTs） in relatively large scale by chemical vapor deposition method. Its catalysis on the decomposition of methane and other carbon source, the reactor type and the process control strategies were discussed. Special focus was concentrated on how to increase the yield, selectivity, and purity of SWNTs and how to inhibit the formation of impurities, including amorphous carbon, multiwalled CNTs and the carbon encapsulated metal particles, since these impurities seriously influenced the performance of SWNTs in supercapacitors. Wish it be helpful to further decrease its product cost and for the commercial use in supercapacitors.

关键词： supercapacitor carbon nanotubes: chemical vapor deposition catalysis methane

Binder-Free Activated Carbon/Carbon Nanotube Paper Electrodes for Use in Supercapacitors

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Nano Research 2011年第9期4卷 870-881页

作者： Guanghui Xu Chao Zheng Qiang Zhang Jiaqi Huang mengqiang zhao Jingqi Nie Xianghua Wang Fei Wei Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical Engineering Tsinghua University Beijing 100084 China CNGC Wuzhou Engineering Design and Research Institute Beijing 100053 China

新奇便宜、轻、灵活、平的 rollup 或便携设备为多功能的便携式的电子学被要求并且作为在当代的电池和 supercapacitors 使用的材料的选择开发新万用、灵活的电极材料是关键挑战。这里，为在先进 supercapacitors 的使用的没有文件夹的... 详细信息

新奇便宜、轻、灵活、平的 rollup 或便携设备为多功能的便携式的电子学被要求并且作为在当代的电池和 supercapacitors 使用的材料的选择开发新万用、灵活的电极材料是关键挑战。这里，为在先进 supercapacitors 的使用的没有文件夹的激活的碳(交流)/carbon nanotube (CNT ) 纸电极基于便宜、工业等级的排列 CNT 被制作了。由砍的一个二拍子的圆舞策略，排列 CNT 被驱散进单个长 CNT，然后交流的 90 wt%99 wt% 粉末被合并到 CNT 肉和 AC/CNT 纸电极被免职在一个过滤器上制作。AC/CNT 纸电极的特定的能力，率表演，和力量密度比对一个交流 / 乙炔黑人电极的相应价值好。电容到达了 267.6 F/g 的最大的价值， CNT 5 wt% 装载，并且精力密度和功率密度是 22.5

关键词：电极材料碳纳米管超级电容器无粘结剂活性炭纳米复合材料便携式电子产品锂离子电池

Automatic modeling algorithm of stochastic error for inertial sensors

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Control Theory and Technology 2024年第1期22卷 81-91页

作者： Luodi zhao Long zhao School of Automation Science and Electrical Engineering Beihang UniversityBeijing100191China Digital Navigation Center Beihang UniversityBeijing100191China Science and Technology on Aircraft Control Laboratory Beihang UniversityBeijing100191China

This paper proposes an automatic algorithm to determine the properties of stochastic processes and their parameters for inertial error. The proposed approach is based on a recently developed method called the generalized method of wavelet moments (GMWM), whose estimator was proven to be consistent and asymptotically normally distributed. This algorithm is suitable mainly (but not only) for the combination of several stochastic processes, where the model identification and parameter estimation are quite difficult for the traditional methods, such as the Allan variance and the power spectral density analysis. This algorithm further explores the complete stochastic error models and the candidate model ranking criterion to realize automatic model identification and determination. The best model is selected by making the trade-off between the model accuracy and the model complexity. The validation of this approach is verified by practical examples of model selection for MEMS-IMUs (micro-electro-mechanical system inertial measurement units) in varying dynamic conditions.

关键词： GMWM Stochastic process Inertial sensor Sensor calibration Error model Allan variance

Meeting the challenges of invasive alien species

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National Science Review 2024年第3期11卷 296-298页

作者： Weijie zhao NSR news

The Xinjiang Uygur Autonomous Region of China is famous for its tomato production. Abundant sunshine, large day–night temperature difference and the abundant irrigation by snowmelt from the Tianshan Mountains produce...

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Ling-Ling Chen: RNA has its own features;don't study it as a protein

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National Science Review 2024年第2期11卷 301-305页

作者： Weijie zhao NSR

Non-coding RNA(ncRNA) has been a very active research area over the past 30 years. From small nc RNA – the discovery of RNA interference won the lead researchers the Nobel Prize, to long ncRNA(lncRNA), which has attracted much attention in recent years, various nc RNAs participate in all kinds of biological processes and show a variety of biomedical application prospects.

关键词： RNA

One dimensional CeO_(2) nanorods/poly(ethylene oxide) solid composite electrolyte for all-solid-state lithium-ion batteries

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Journal of Rare Earths 2024年第3期42卷 570-577,I0005页

作者： Yudi Guo Erqing zhao Xiaofang zhao Shuailei Liu School of Chemistry and Materials Engineering Xinxiang UniversityXinxiang453003China School of Chemistry and Chemical Engineering Henan Institute of Science and TechnologyXinxiang453003China

The research of poly(ethylene oxide)(PEO)-based solid composite electrolyte with high ionic conductivity and excellent interfacial stability is the key to the development of all-solid-state lithium-ion batteries(ASSLIBs). Herein, uniform nanorod structured CeO_(2) fillers were controllably synthesized by electrospinning, which were subsequently filled into PEO polymer to prepare CeO_(2)/PEO solid composite electrolyte. The addition of CeO_(2) nanorods can reduce both the glass transition temperature and the melting point of PEO polymer, and also interact with PEO and lithium bis(trifluoromethanesulphonyl)imide(LITFSI) by Lewis acid—base reaction. Therefore, the solid composite electrolyte exhibits a high ionic conductivity of 4.52 × 10^(-4)S/cm, a wide electrochemical stability window of about 4.8 V, and a good interfacial stability with Li at 55℃. Moreover, the LiFePO_4/Li ASSLIB divulges the discharging specific capacity of 165, 162, 156 and 146 mA,h/g at 0.2, 0.5, 1 and 2 C, respectively, and achieves the capacity retention of 90.3% after 150 cycles at 0.5 C. Consequently, one dimensional CeO_(2) nanorods can be considered as an alternative filler for polymeric solid electrolyte.

关键词： Poly(ethylene oxide) Solid composite electrolyte CeO_(2)nanorods Ionic conductivity Rare earths