检索结果-南通市图书馆

Intraday patterns of price clustering in Bitcoin

在线全文

学校读者我要写书评

暂无评论

Financial Innovation 2022年第1期8卷 56-80页

作者： Donglian Ma Hisashi Tanizaki Shenzhen Audencia Business School Shenzhen UniversityShenzhen 518060China Graduate School of Economics Osaka UniversityOsaka 560-0043Japan

In this study,an investigation is conducted into the phenomenon of price clustering in Bitcoin(btc)denominated in the Japanese yen(JPY).It answers two questions using tick-by-tick data.The first is whether price clustering exists in btc/JPY transactions,and the other is how the scale of price clustering varies throughout a trading day.With the assistance of statistical measures,the last two digits of btc price were discovered to cluster at the numbers that end with’00’.In addition,the scales of btc/JPY clustering at’00’tended to decline at the specific hour intervals.This study contributes to the emerging literature on price clustering and investor behavior.

关键词： btc Price clustering Intraday pattern Tick-by-tick

Microwave-assisted synthesis of nanoscale Eu(btc)(H_2O)·DMF with tunable luminescence

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

Science China Chemistry 2015年第6期58卷 973-978页

作者： Song Dang Shuyan Song Jing Feng Hongjie Zhang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences

Nanoscale europium(III) metal-organic frameworks, Eu(btc)(H2O)?DMF, were synthesized by rapid microwave-assisted method. The components of the as-prepared products were confirmed by the elemental analysis, X-ray powder diffraction(XRD), thermal gravimetric analysis(TGA) and Fourier-transform infrared spectra(FTIR) analyses. Eu(btc)(H2O)?DMF with various morphologies, including particle-like, rod-like, straw-sheaf-like nanostructures, could be simply prepared by controlling the concentrations of the starting reactants. The optical measurements on the obtained Eu(btc)(H2O)?DMF indicated that all the nanomaterials show the characteristic emissions of the Eu3+ ions at 578, 590, 612, 650, and 699 nm, which were attributed to 5D0?7FJ(J=0–4) transitions of the Eu3+ ion, respectively. It was also noticed that the luminescent properties of the as-prepared products were heavily dependent on the morphologies and sizes of the nanomaterials. The assembled straw-sheaf-like architectures displayed the strongest emissions and the longest luminescence lifetime, which was mainly due to the fewest surface defects.

关键词：微波辅助合成纳米结构发光性能铕离子 btc DMF 傅里叶变换红外光谱粉末X射线衍射

Underlying mechanism of the hydrothermal instability of Cu3（btc）2 metal-organic framework

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2016年第1期10卷 103-107页

作者： Nadeen AI-Janabi Abdullatif Alfutimie Flor R. Siperstein Xiaolei Fan School of Chemical Engineering and Analytical Science The University of Manchester Oxford Road Manchester M13 9PL UK

水导致了 Cu 3(btc)2(btc = benzene-1,3,5-tricarboxylate ) 的分解金属器官的框架(MOF ) 用动态水被学习蒸汽吸附。散布的小角度的 X 光检查，红外线的光谱学和微分扫描热量测定分析的 Fourier 变换表明在潮湿的溪流下面的 Cu 3(btc)2... 详细信息

水导致了 Cu 3(btc)2(btc = benzene-1,3,5-tricarboxylate ) 的分解金属器官的框架(MOF ) 用动态水被学习蒸汽吸附。散布的小角度的 X 光检查，红外线的光谱学和微分扫描热量测定分析的 Fourier 变换表明在潮湿的溪流下面的 Cu 3(btc)2 MOF 分解的内在的机制是进 Cu-btc 协作的水分子的互相贯通从 Cu 中心代替器官的连接器(btc ) 。

关键词：金属有机 btc 热不稳定框架机制傅里叶变换红外光谱差示扫描量热分析小角X射线散射

A novel btc decoding algorithm based on the genetic algorithm in optical communication systems

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

Optoelectronics Letters 2014年第2期10卷 123-125页

作者：袁建国田杨胡夏黄胜林金朝庞宇 Key Lab. of Optical Fiber Communication Technology Chongqing University of Posts and Telecommunications

Combining the advantages of both the genetic algorithm(GA) and the chase decoding algorithm, a novel improved decoding algorithm of the block turbo code(btc) with lower computation complexity and more rapid decoding speed is proposed in order to meet the developing demands of optical communication systems. Compared with the traditional chase decoding algorithm, the computation complexity can be reduced and the decoding speed can be accelerated by applying the novel algorithm. The simulation results show that the net coding gain(NCG) of the novel btc decoding algorithm is 1.1 dB more than that of the traditional chase decoding algorithm at the bit error rate(BER) of 10-6. Therefore, the novel decoding algorithm has better decoding correction-error performance and is suitable for the btc in optical communication systems.

关键词：光通信系统解码算法遗传算法 btc 计算复杂度 Turbo码译码算法仿真结果

A novel RS btc coding scheme for optical communications

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2012年第4期8卷 284-288页

作者：袁建国贾跃幸胡云霞 Key Laboratory of Optical Fiber Communication Technology Chongqing University of Posts and Telecommunications

A novel Reed Solomon(RS) block turbo code(btc) coding scheme of RS(63,58)×RS(63,58) for optical communications is proposed.The simulation results show that the net coding gain(NCG) of this scheme at the sixth iteration is more than that of other coding schemes at the third iteration for the bit error rate(BER) of 10-12.Furthermore,the novel RS btc has shorter component code and rapider encoding and decoding speed.Therefore,the novel RS btc coding scheme can be better used in high-speed long-haul optical communication systems,and the novel RS btc can be regarded as a candidate code of the super forward error correction(super-FEC) code.Moreover,the encoding/decoding design and implementation of the novel RS btc are also presented.

关键词：光通信系统编码方案 btc RS 编码/解码 Turbo码超强前向纠错通信编码

Unequal error protection system for robust video transmission

在线全文

学校读者我要写书评

暂无评论

High Technology Letters 2006年第1期12卷 24-30页

作者：王粤 Du Yinggang Yu Songyu Qiao Yantao Wang Jia Institute of Image Communication ＆ Information Processing Research Shanghai Jiaotong University Shanghai 200030 P.R. China

With the development of multimedia communication services, robust video transmission over wireless environment poses many challenges. A UEP_btc_STBC_OFDM system is proposed to provide unequal error protection for the source coded video stream in dispersive fading channel. The scheme concatenates the Block Turbo code (btc) with the space-time block code (STBC) for an orthogonal frequency division multiplexing (OFDM) system. With the proposed system, both the good error correcting capability of btc and the concurrent large diversity gain characteristic of STBC can be achieved simultaneously with low encoding and decoding complexity. Furthermore, by combining with the data partition of H.264 and different btc codes, this system can guarantee high QoS control of video transmission. Simulation result shows that the proposed system outperforms other reported schemes and has good performance of video transmission.

关键词：视频传输 UEP H.264 btc STBC OFDM 误差防护

多酸阴离子对金属有机骨架纳米晶生长的调控（英文）

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

Science China Materials 2015年第5期58卷 370-377页

作者：徐晓斌陆言杨勇 Farhat Nosheen 王训 Department of Chemistry Tsinghua University

在金属阳离子和多酸阴离子之间广泛存在着一种超分子相互作用,它经常被用来合成多酸基金属-有机骨架晶态材料.这种相互作用还可以用来调控金属-有机骨架材料的成核生长过程,从而实现其纳米晶体的可控制备.本文将Keggin型多酸阴离子引入... 详细信息

在金属阳离子和多酸阴离子之间广泛存在着一种超分子相互作用,它经常被用来合成多酸基金属-有机骨架晶态材料.这种相互作用还可以用来调控金属-有机骨架材料的成核生长过程,从而实现其纳米晶体的可控制备.本文将Keggin型多酸阴离子引入到金属-有机骨架材料的前驱体溶液中作为调节剂,得到一系列形貌规则、尺寸均一的[Cu3(btc)2]n(btc=1,3,5-苯三甲酸)纳米晶,包括八面体、截角八面体、多级空心球、空心八面体等.此外,这种体系可以用于构建贵金属纳米晶@金属-有机骨架复合材料,其催化性质相对于单纯的贵金属纳米晶有较大提高.

关键词：纳米晶 Cu btc 多酸阴离子 POMs 调控调节控制

在线全文

学校读者我要写书评

暂无评论

直流输电换流阀晶闸管过电压保护研究

电力系统保护与控制 2020年第10期48卷 182-187页

作者：王振任孟干国建宝张蕴馨周亮刘道民中国南方电网超高压输电公司检修中心广东广州510663 中电普瑞电力工程有限公司北京102200

晶闸管承受过电压的能力较弱,瞬时过电压可导致晶闸管的击穿。首先研究了直流输电核心设备之一晶闸管换流阀发生晶闸管过电压击穿对直流输电系统的影响,分析了直流输电换流阀晶闸管配置过电压保护的必要性。然后对btc和BOD两种晶闸管过... 详细信息

晶闸管承受过电压的能力较弱,瞬时过电压可导致晶闸管的击穿。首先研究了直流输电核心设备之一晶闸管换流阀发生晶闸管过电压击穿对直流输电系统的影响,分析了直流输电换流阀晶闸管配置过电压保护的必要性。然后对btc和BOD两种晶闸管过电压保护方式进行了理论计算与分析,并采用PSPICE软件搭建了仿真模型进行仿真分析。最后在实验室搭建实验电路对两种过电压保护电路性能进行了验证。研究表明两种保护方式均可以实现晶闸管过电压保护的要求。

关键词：晶闸管过电压保护 BOD btc 仿真模型

在线全文

学校读者我要写书评

暂无评论

控制btc焊点空洞率的工艺方法研究

丝网印刷 2022年第22期 40-44页

作者：周祥苏州工业园区职业技术学院

电子工业使用各类底部端子元器件btc焊点的焊接过程中容易产生气泡,形成空洞缺陷。文章对焊接过程中btc焊点产生空洞的机理进行分析,并通过实验来分析工艺方法对焊点空洞率的影响规律。

关键词： btc 焊点空洞率工艺