期刊文献+
共找到295篇文章
< 1 2 15 >
每页显示 20 50 100
Coseismic Coulomb stress changes induced by a 2020-2021 M_(W)>7.0 Alaska earthquake sequence in and around the Shumagin gap and its influence on the Alaska-Aleutian subduction interface
1
作者 Lei Yang Jianjun Wang Caijun Xu 《Geodesy and Geodynamics》 EI CSCD 2024年第1期1-12,共12页
Three M_(W)>7.0 earthquakes in 2020-2021 occurred in the Shumagin seismic gap and its adjacent area of the Alaska-Aleutian subduction zone,including the Mw7.8 Simeonof thrust earthquake on July 22,2020,the M_(W)7.6... Three M_(W)>7.0 earthquakes in 2020-2021 occurred in the Shumagin seismic gap and its adjacent area of the Alaska-Aleutian subduction zone,including the Mw7.8 Simeonof thrust earthquake on July 22,2020,the M_(W)7.6 Sand Point strike-slip earthquake on October 19,2020,and the M_(W)8.2 Chignik thrust earthquake on July 29,2021.The spatial and temporal proximity of these three earthquakes prompts us to probe stress-triggering effects among them.Here we examine the coseismic Coulomb stress change imparted by the three earthquakes and their influence on the subduction interface.Our results show that:(1)The Simeonof earthquake has strong loading effects on the subsequent Sand Point and Chignik earthquakes,with the Coulomb stress changes of 3.95 bars and 2.89 bars,respectively.The Coulomb stress change caused by the Sand Point earthquake at the hypocenter of the Chignik earthquake is merely around 0.01 bars,suggesting the negligible triggering effect on the latter earthquake;(2)The triggering effects of the Simeonof,Sand Point,and Chignik earthquakes on aftershocks within three months are not well pronounced because of the triggering rates of 38%,14%,and 43%respectively.Other factors may have played an important role in promoting the occurrence of these aftershocks,such as the roughness of the subduction interface,the complicated velocity structure of the lithosphere,and the heterogeneous prestress therein;(3)The three earthquakes caused remarkable coseismic Coulomb stress changes at the subduction interface nearby these mainshocks,with an average Coulomb stress change of 3.2 bars in the shallow region directly inwards the trench. 展开更多
关键词 The 2020-2021 Alaska earthquake SEQUENCE Coseismic Coulomb stress change Mainshock-aftershock triggering The Alaska-Aleutian subduction interface The Shumagin gap
下载PDF
Nano-scale gap filling and mechanism of deposit-etch-deposit process for phase-change material 被引量:1
2
作者 任万春 刘波 +4 位作者 宋志棠 向阳辉 王宗涛 张北超 封松林 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第11期335-339,共5页
Ge2Sb2Te5 gap filling is one of the key processes for phase-change random access memory manufacture. Physical vapor deposition is the mainstream method of Ge2Sb2Te5 film deposition due to its advantages of film qualit... Ge2Sb2Te5 gap filling is one of the key processes for phase-change random access memory manufacture. Physical vapor deposition is the mainstream method of Ge2Sb2Te5 film deposition due to its advantages of film quality, purity, and accurate composition control. However,the conventional physical vapor deposition process cannot meet the gap- filling requirement with the critical device dimension scaling down to 90 nm or below. In this study, we find that the deposit-etch-deposit process shows better gap-filling capability and scalability than the single-step deposition process, especially at the nano-scale critical dimension. The gap-filling mechanism of the deposit-etch-deposit process was briefly discussed. We also find that re-deposition of phase-change material from via the sidewall to via the bottom by argon ion bombardment during the etch step was a key ingredient for the final good gap filling. We achieve void-free gap filling of phase-change material on the 45-nm via the two-cycle deposit-etch-deposit process. We gain a rather comprehensive insight into the mechanism of deposit-etch-deposit process and propose a potential gap-filling solution for over 45-nm technology nodes for phase-change random access memory. 展开更多
关键词 deposit-etch deposit process single step deposit gap filling RE-DEPOSITION
下载PDF
Gap Filling of Net Ecosystem CO<sub>2</sub>Exchange (NEE) above Rain-Fed Maize Using Artificial Neural Networks (ANNs) 被引量:1
3
作者 Babak Safa Timothy J. Arkebauer +2 位作者 Qiuming Zhu Andy Suyker Suat Irmak 《Journal of Software Engineering and Applications》 2021年第5期150-171,共22页
<span style="font-family:Verdana;">The eddy covariance technique is an accurate and direct tool to measure the Net Ecosystem Exchange (NEE) of carbon dioxide. However, sometimes conditions are not amen... <span style="font-family:Verdana;">The eddy covariance technique is an accurate and direct tool to measure the Net Ecosystem Exchange (NEE) of carbon dioxide. However, sometimes conditions are not amenable to measurements using this technique. Thus, different methods have been developed to allow gap-filling and quality assessment of eddy covariance data sets. In this study first, two different Artificial Neural Networks (ANNs) approaches, the Multi-layer Perceptron (MLP) trained by the Back-Propagation (BP) algorithm, and the Radial Basis Function (RBF), were used to fill missing NEE data measured above rain-fed maize at the University of Nebraska-Lincoln Agricultural Research and Development Center near Mead, Nebraska. The gap-filled data were then compared by different statistical indices to gap-filled data obtained with the technique suggested by Suyker and Verma in 2005 [S&V method], and the ANN approach presented by Papale in 2003. The results showed that the RBF network was able to find better fits for missing values compared to the MLP (BP) network and S&V method. In addition, unlike the S&V method, which depends on different gap-filling procedures over the year;the structure of RBF and MLP (BP) networks was constant. However, data analysis indicated Papale’s approach gave better fits than the RBF and MLP (BP) methods. Thus, based on this work, Papale’s approach is the best method to estimate the missing data;though the applied statistical indices, which were used for model evaluation, show little difference between Papale’s approach and the RBF and MLP (BP).</span> 展开更多
关键词 gap filling Net Ecosystem Exchange of Carbon Dioxide Artificial Neural Networks Eddy Covariance System
下载PDF
A Data-Adaptive Filter of the Tahiti-Darwin Southern Oscillation Index and the Associate Scheme of Filling Data Gaps
4
作者 张邦林 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 1994年第4期447-458,共12页
The Tahiti-Darwin Southern Oscillation index provided by Climate Analysis Center of USA has been used in numerous studies. But, it has some deficiency. It contains noise mainly due to high month-to-month variability. ... The Tahiti-Darwin Southern Oscillation index provided by Climate Analysis Center of USA has been used in numerous studies. But, it has some deficiency. It contains noise mainly due to high month-to-month variability. In order to reduce the level of noise in the SO index, this paper introduces a fully data-adaptive filter based on singular spectrum analysis. Another interesting aspect of the filter is that it can be used to fill data gaps of the SO index by an iterative process. Eventually, a noiseless long-period data series without any gaps is obtained. 展开更多
关键词 Southern Oscillation index Data-adaptive filter Scheme of filling data gaps Iterative process
下载PDF
The efficacy of Kriging spatial interpolation for filling temporal gaps in daily air temperature data: A case study in northeast China 被引量:1
5
作者 YanLin Zhang XiaoLi Chang +2 位作者 Ji Liang DongLiang Luo RuiXia He 《Research in Cold and Arid Regions》 CSCD 2016年第5期441-449,共9页
Quality-controlled and serially complete daily air temperature data are essential to evaluating and modelling the influences of climate change on the permafrost in cold regions. Due to malfunctions and location chang... Quality-controlled and serially complete daily air temperature data are essential to evaluating and modelling the influences of climate change on the permafrost in cold regions. Due to malfunctions and location changes of observing stations, temporal gaps (i.e., missing data) are common in collected datasets. The objective of this study was to assess the efficacy of Kriging spatial interpolation for estimating missing data to fill the temporal gaps in daily air temperature data in northeast China. A cross-validation experiment was conducted. Daily air temperature series from 1960 to 2012 at each station were estimated by using the universal Kriging (UK) and Kriging with an external drift (KED), as appropriate, as if all the ob-servations at a given station were completely missing. The temporal and spatial variation patterns of estimation uncertainties were also checked. Results showed that Kriging spatial interpolation was generally desirable for estimating missing data in daily air temperature, and in this study KED performed slightly better than UK. At most stations the correlation coefficients (R2) between the observed and estimated daily series were 〉0.98, and root mean square errors (RMSEs) of the estimated daily mean (Tmean), maximum (Tmax), and minimum (Tmin) of air temperature were 〈3 ℃. However, the estimation quality was strongly affected by seasonality and had spatial variation. In general, estimation uncertainties were small in summer and large in winter. On average, the RMSE in winter was approximately 1 ℃ higher than that in summer. In addition, estimation uncertainties in mountainous areas with complex terrain were significantly larger than those in plain areas. 展开更多
关键词 daily air temperature gap filling Kriging spatial interpolation northeast China
下载PDF
Lexical Gaps" Their Filling and Impacts
6
作者 WANG Quan-zhi 《Journal of Literature and Art Studies》 2017年第6期748-754,共7页
The issue of lexical gaps is one of the major concerns in linguistics. By confining it to one and the same languageand redefining a lexical gap as any lexical item which can potentially occupy a reasonable slot but do... The issue of lexical gaps is one of the major concerns in linguistics. By confining it to one and the same languageand redefining a lexical gap as any lexical item which can potentially occupy a reasonable slot but does not do so inreality in a lexical field, this paper conducts an exploration into the devices for their filling with a purpose tohighlight the impacts thus arising. 展开更多
关键词 LEXICAL gap filling IMPACTS
下载PDF
HARP-SiCoNi工艺在量产环境下提升高台阶比浅沟道隔离填充能力的研究
7
作者 倪立华 丁亚钦 李宗旭 《集成电路应用》 2024年第4期52-54,共3页
阐述基于量产环境中“高台阶比”的“非标准V型”STI结构,使用传统的HARP和SiCoNi组合工艺研究该结构Void Free的填充方案,并测试HARP预沉积厚度和SiCoNi刻蚀量的工艺窗口,实现量产环境下“高台阶比”的“非标准V型”沟槽Void Free填充。
关键词 集成电路制造 STI填充 HARP SiCoNi VOID
下载PDF
The In-orbit Application of 25Nms Gyroscope Fills the Gap in Domestic Market
8
《Aerospace China》 2012年第3期16-16,共1页
After the successful launch of Yaogan 14, the 25Nms control moment gyroscope onboard the Yaogan 14 satellite successfully finished the attitude maneuver commands to the satellite and operates in a normal state. The su... After the successful launch of Yaogan 14, the 25Nms control moment gyroscope onboard the Yaogan 14 satellite successfully finished the attitude maneuver commands to the satellite and operates in a normal state. The successful maiden use of the 25Nms gyroscope fills the gap in the field of small control moment gyroscopes in 展开更多
关键词 The In-orbit Application of 25Nms Gyroscope fills the gap in Domestic Market
下载PDF
国家中药材GAP基地产川芎挥发油化学成分的GC-MS分析 被引量:29
9
作者 吴琦 杨秀伟 《中国中药杂志》 CAS CSCD 北大核心 2008年第3期276-280,共5页
目的:研究国家中药材GAP基地"川芎GAP都江堰示范基地"种植川芎挥发油的化学成分,为其质量控制和标准制定提供科学依据。方法:采用水蒸气蒸馏法提取挥发油,GC毛细管柱色谱法进行分析,归一化法测定其相对含量,气相色谱-质谱联... 目的:研究国家中药材GAP基地"川芎GAP都江堰示范基地"种植川芎挥发油的化学成分,为其质量控制和标准制定提供科学依据。方法:采用水蒸气蒸馏法提取挥发油,GC毛细管柱色谱法进行分析,归一化法测定其相对含量,气相色谱-质谱联用技术辅助人工检索鉴定其化学成分。结果:检出142个色谱峰,鉴定了62个化合物,占挥发油总量的87.36%。总结了川芎挥发油中苯酞类化合物及其衍生物的质谱裂解规律,主要存在侧链断裂脱烯/烃和开环脱水再脱羰基两个电子轰击裂解途径。并以此为依据,推测了4,5-二氢-3,1′-二羟基-3-戊基苯酞的结构。结论:"川芎GAP都江堰示范基地"种植川芎挥发油的主要化学成分为苯酞类化合物及其衍生物;4,5-二氢-3,1′-二羟基-3-戊基苯酞为新的化合物。 展开更多
关键词 川芎 中药材gap基地 挥发油 4 5-二氢-3 1’-二羟基-3-戊基苯酞 气相色谱-质谱
下载PDF
BAMO-GAP基ETPE的合成与性能研究 被引量:6
10
作者 王建峰 黄振亚 侯果文 《火炸药学报》 EI CAS CSCD 北大核心 2016年第2期45-49,共5页
以3,3′-二叠氮甲基氧丁环均聚物(PBAMO)和4,4′-二苯基甲烷二异氰酸酯(MDI)为硬段,聚叠氮缩水甘油醚(GAP)为软段,1,4-丁二醇(BDO)为扩链剂,采用预聚体法合成了BAMO-GAP基含能热塑性弹性体(ETPE);采用FT-IR、NMR方法对ETPE的结构进行了... 以3,3′-二叠氮甲基氧丁环均聚物(PBAMO)和4,4′-二苯基甲烷二异氰酸酯(MDI)为硬段,聚叠氮缩水甘油醚(GAP)为软段,1,4-丁二醇(BDO)为扩链剂,采用预聚体法合成了BAMO-GAP基含能热塑性弹性体(ETPE);采用FT-IR、NMR方法对ETPE的结构进行了表征;研究了合成条件对ETPE的力学性能、相对分子质量、玻璃化转变温度以及软化点的影响。结果表明,合成的ETPE符合预期结构;异氰酸酯指数(R)大于1时生成交联体。n(PBAMO)∶n(GAP)为0.35∶0.65时,ETPE胶片的力学性能最佳;随着n(PBAMO+GAP)∶n(MDI)∶n(BDO)中BDO比例的增大,ETPE的相对分子质量得到提高,改善了胶片的力学性能,PBAMO相对含量的提高导致玻璃化转变温度升高;软化点随n(PBAMO+GAP)∶n(MDI)∶n(BDO)中BDO所占比例、R值、n(PBAMO)∶n(GAP)的增大而升高。 展开更多
关键词 3 3′-双叠氮甲基氧丁环 PBAMO 聚叠氮缩水甘油醚 gap 含能热塑性弹性体 ETPE
下载PDF
GaP_(1-x)N_x混晶(x=0.24%~3.1%)发光复合机制的研究
11
作者 吕毅军 高玉琳 +5 位作者 林顺勇 郑健生 张勇 Mascarenhas A 辛火平 杜武青 《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 2004年第4期491-495,共5页
利用变温光致发光(PL)谱研究了一系列GaP1-xNx混晶的发光复合机制.GaP1-xNx混晶的PL谱从低组分的NN对束缚激子及其声子伴线到高组分杂质带发光的特征,表现出明显的带隙降低的趋势.测量结果显示,在组分x≥0.24%的样品的发光谱中NN1能量... 利用变温光致发光(PL)谱研究了一系列GaP1-xNx混晶的发光复合机制.GaP1-xNx混晶的PL谱从低组分的NN对束缚激子及其声子伴线到高组分杂质带发光的特征,表现出明显的带隙降低的趋势.测量结果显示,在组分x≥0.24%的样品的发光谱中NN1能量之下已经开始出现几个新的束缚态,在低组分的混晶中,只存在一种激活能,仍然保持有束缚激子的特征;而在高组分样品(x≥0.81%)中存在两种激活能.高组分样品一方面仍保留有束缚激子的特征,另一方面也表现出新的发光机制. 展开更多
关键词 发光 半导体 带隙弯曲 变温光致发光 gap1-χNχ混晶 激活能
下载PDF
含有5-氨基四唑的GAP/AN基推进剂的研究
12
作者 郑启龙 刘海涛 +2 位作者 殷成忠 肖乐勤 周伟良 《爆破器材》 CAS 2017年第3期12-16,共5页
为探索5-氨基四唑(5-AT)对推进剂性能的影响,采用浇铸工艺制备了含5-AT的聚叠氮基缩水甘油醚/硝酸铵(GAP/AN)基推进剂试样,通过最小自由能法计算了其能量性能,通过静态力学拉伸试验测试其力学性能,通过靶线法表征其燃烧性能,并测试了其... 为探索5-氨基四唑(5-AT)对推进剂性能的影响,采用浇铸工艺制备了含5-AT的聚叠氮基缩水甘油醚/硝酸铵(GAP/AN)基推进剂试样,通过最小自由能法计算了其能量性能,通过静态力学拉伸试验测试其力学性能,通过靶线法表征其燃烧性能,并测试了其机械感度。结果表明,5-AT的加入可以显著提高燃气中N_2的生成量,但当GAP/增塑剂(A3)的含量较大时,理论比冲及爆温均随着5-AT含量的增加逐渐减小;与GAP/AN推进剂相比,添加质量分数为10%的5-AT后,推进剂的燃速压力指数显著降低0.2,9 MPa下燃速提高了15.3%;推进剂断裂伸长率增加,但拉伸强度下降了57.7%,且机械感度升高。 展开更多
关键词 5-氨基四唑 gap/AN推进剂 能量性能 力学性能 燃烧性能
下载PDF
利用探针-质谱仪研究GAP的分解化学和燃烧化学
13
作者 陈沛 《飞航导弹》 2002年第7期45-49,共5页
在较宽的压力范围和较高的加热速率下 ,研究了分子量分别为 35 0、2 0 0 0的未交联GAP和分子量为 2 0 0 0的固化GAP的燃烧特性(如燃速、温度分布 )、燃烧产物组成、热分解动力学和热分解产物组成 ,并用所获得的数据发展了GAP及以GAP为... 在较宽的压力范围和较高的加热速率下 ,研究了分子量分别为 35 0、2 0 0 0的未交联GAP和分子量为 2 0 0 0的固化GAP的燃烧特性(如燃速、温度分布 )、燃烧产物组成、热分解动力学和热分解产物组成 ,并用所获得的数据发展了GAP及以GAP为基的推进剂的燃烧模型。 展开更多
关键词 探针-质谱仪 gap 分解化学 燃烧化学 含能粘合剂 燃速
下载PDF
Tuning of band gaps for a two-dimensional piezoelectric phononic crystal with a rectangular lattice 被引量:9
14
作者 Yize Wang Fengming Li +2 位作者 Yuesheng Wang Kikuo Kishimoto Wenhu Huang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2009年第1期65-71,共7页
In this paper, the elastic wave propagation in a two-dimensional piezoelectric phononic crystal is studied by considering the mechanic-electric coupling. The generalized eigenvalue equation is obtained by the relation... In this paper, the elastic wave propagation in a two-dimensional piezoelectric phononic crystal is studied by considering the mechanic-electric coupling. The generalized eigenvalue equation is obtained by the relation of the mechanic and electric fields as well as the Bloch-Floquet theorem. The band structures of both the in-plane and anti-plane modes are calculated for a rectangular lattice by the planewave expansion method. The effects of the lattice constant ratio and the piezoelectricity with different filling fractions are analyzed. The results show that the largest gap width is not always obtained for a square lattice. In some situations, a rectangular lattice may generate larger gaps. The band gap characteristics are influenced obviously by the piezoelectricity with the larger lattice constant ratios and the filling fractions. 展开更多
关键词 PIEZOELECTRICITY Phononic crystal Rectangular lattice - Plane-wave expansion method Band gap
下载PDF
The effect of microgene pSVPoMcat to modify Schwann cell on GAP -43 expression after spinal cord injury in adult rats 被引量:3
15
作者 陈礼刚 高立达 +2 位作者 毛伯镛 杨立斌 李开慧 《中国组织工程研究与临床康复》 CAS CSCD 2001年第18期142-143,共2页
Objective To study the effect of microgene pSVP oMcat implanted to modify schwann cell on growth associated protein -43(GAP -43)expression after spinal cord injury in adult rats.Method Hemisected of the T8segment of t... Objective To study the effect of microgene pSVP oMcat implanted to modify schwann cell on growth associated protein -43(GAP -43)expression after spinal cord injury in adult rats.Method Hemisected of the T8segment of the sp inal cord was performed for all the experiment rats.The rats were randomly divided into three groups as follows:Group Awith microgene pSVPoMca t implanted to genetically modify SC;Group B with SC implanted ;Group C with hemisection of the spinal cord o nly.The changes of expression of GAP-43in spinal cord were observed by immunochemistry with antibodies against GAP -43.Simultaneous,the combined behavioral scores(CBS)was measured.Result There were not any different (P >0.05)among the three groups in first week a nd 12week.There were significant di ffeence(P <0.05)among three groups in 2nd,8th,and more dxpression of GAP -43at the 2nd week in gr oup A.The neurofunctional recovery was best in group A.Conclusion The microgene pSVPoMcat implanted t o modify schwann cell can promote the expression of GAP -43in spinal cord a nd func-tional recovery in adults rats after SCI. 展开更多
关键词 spinal cord injury gene gap -43 im plantation rat
下载PDF
TFT-LCD改善Particle Gap的研究 被引量:4
16
作者 高欢 陈文智 +7 位作者 姚晔 张南红 汤展峰 辛志远 李静 范恒亮 韩君奇 尹文祥 《液晶与显示》 CAS CSCD 北大核心 2018年第2期129-137,共9页
Particle Gap是TFT-LCD制程中常见的一种缺陷。以55UHD产品为例,Particle Gap发生率约为1.0%,对产品良率影响较大,为提升液晶屏品质和客户满意度,急需改善此不良。文章结合不良现象研究Particle Gap的主要异物模式,最终通过改善CF研磨... Particle Gap是TFT-LCD制程中常见的一种缺陷。以55UHD产品为例,Particle Gap发生率约为1.0%,对产品良率影响较大,为提升液晶屏品质和客户满意度,急需改善此不良。文章结合不良现象研究Particle Gap的主要异物模式,最终通过改善CF研磨失败异物、沙粒状异物和透明状异物这种模式达到整体Particle Gap降低的效果。首先利用流程图分析影响异物模式的关键步骤,然后通过鱼骨图、决策矩阵、假设检验验证找出影响异物模式的显著因素,最后通过合力促进法总结出显著因素的最佳改善方案,导入量产并文件标准化,可平行推广至55UHD以外的其它尺寸。改善结果表明:通过以上3种异物类型的改善,55UHD Particle Gap发生率降低至少30%,为公司带来了巨大且显著的硬性节省。 展开更多
关键词 薄膜电晶体-液晶显示器 PARTICLE gap CF研磨失败异物 透明状异物 沙粒状异物
下载PDF
ANN-BiLSTM模型在温带荒漠灌丛碳通量数据缺失值插补中的应用 被引量:1
17
作者 冯新妍 贾昕 +4 位作者 黄金泽 高圣杰 袁敏 刘甜甜 靳川 《北京林业大学学报》 CAS CSCD 北大核心 2023年第9期62-72,共11页
【目的】为提高净生态系统碳交换量(NEE)在长期缺失下的插补精度,利用人工神经网络(ANN)和双向长短期记忆网络(Bi-LSTM)将NEE的环境因子和时序特征相结合,提出了ANN-BiLSTM模型。【方法】以宁夏盐池观测站NEE数据及微气象数据为研究对象... 【目的】为提高净生态系统碳交换量(NEE)在长期缺失下的插补精度,利用人工神经网络(ANN)和双向长短期记忆网络(Bi-LSTM)将NEE的环境因子和时序特征相结合,提出了ANN-BiLSTM模型。【方法】以宁夏盐池观测站NEE数据及微气象数据为研究对象,通过随机剔除连续7、15、30、45和90 d的5类缺失情景来评估ANN-BiLSTM模型、随机森林(RF)、人工神经网络(ANN)、K最邻近(KNN)、支持向量回归(SVR)和边际分布采样法(MDS)在NEE长期缺失下的插值结果。【结果】当NEE缺失天数≤30 d时,各模型的插值精度相对可靠,ANN-BiLSTM模型的插值精度最高,决定系数(R^(2))均值在0.48~0.56之间,均方根误差(RMSE)和平均绝对误差(MAE)分别在0.68~1.92μmol/(m^(2)·s)、0.45~1.30μmol/(m^(2)·s)之间。当数据缺失天数≥45 d时,MDS不能对缺失值进行处理,ANN-BiLSTM模型的插值精度明显高于机器学习模型,R^(2)均值> 0.45,RMSE和MAE分别在0.79~1.95μmol/(m^(2)·s)、0.50~1.32μmol/(m^(2)·s)之间。【结论】当温带荒漠灌丛生态系统的NEE数据缺失长度> 30 d时,建议应用ANN-BiLSTM模型对缺失数据进行插补,可以在一定程度上提高NEE长期插值结果的精度。 展开更多
关键词 碳通量 ANN-BiLSTM 机器学习 长期插值
下载PDF
Materials Design on the Origin of Gap States in a High-κ/GaAs Interface
18
作者 Weichao Wang Cheng Gong +3 位作者 Ka Xiong Santosh K.C. Robert M.Wallace Kyeongjae Cho 《Engineering》 SCIE EI 2015年第3期372-377,共6页
Given the demand for constantly scaling micro- electronic devices to ever smaller dimensions, a SiO2 gate dielectric was substituted with a higher dielectric-constant material, Hf(Zr)O2, in order to minimize current... Given the demand for constantly scaling micro- electronic devices to ever smaller dimensions, a SiO2 gate dielectric was substituted with a higher dielectric-constant material, Hf(Zr)O2, in order to minimize current leakage through dielectric thin film. However, upon interfacing with high dielectric constant (high-κ) dielectrics, the electron mobility in the conventional Si channel degrades due to Coulomb scattering, surface-roughness scattering, remotephonon scattering, and dielectric-charge trapping.Ⅲ-Ⅴ and Ge are two promising candidates with superior mobility over Si. Nevertheless, Hf(Zr)O2/Ⅲ-Ⅴ(Ge) has much more complicated interface bonding than Si-based interfaces. Successful fabrication of a high-quality device critically depends on understanding and engineering the bonding configurations at Hf(Zr)O2/Ⅲ-Ⅴ(Ge) interfaces for the optimal design of device interfaces. Thus, an accurate atomic insight into the interface bonding and mechanism of interface gap states formation becomes essential. Here, we utilize first- principle calculations to investigate the interface between HfO2 and GaAs. Our study shows that As--As dimer bonding, Ga partial oxidation (between 3+ and 1+) and Ga- dangling bonds constitute the major contributions to gap states. These findings provide insightful guidance for optimum interface passivation. 展开更多
关键词 high-mobility device high-κ/Ⅲ- interface interfacial gap states first-principle calculations
下载PDF
Band Gap Opening of Graphene by Noncovalent π-π Interaction with Porphyrins
19
作者 Arramel   Andres Castellanos-Gomez Bart Jan van Wees 《Graphene》 2013年第3期102-108,共7页
Graphene has been recognized as a promising 2D material with many new properties. However, pristine graphene is gapless which hinders its direct application towards graphene-based semiconducting devices. Recently, var... Graphene has been recognized as a promising 2D material with many new properties. However, pristine graphene is gapless which hinders its direct application towards graphene-based semiconducting devices. Recently, various ways have been proposed to overcome this problem. In this study, we report a robust method to open a gap in graphene via noncovalent functionalization with porphyrin molecules. Two type of porphyrins, namely, iron protoporphyrin (FePP) and zinc protoporphryin (ZnPP) were independently physisorbed on graphene grown on nickel by chemical vapour deposition (CVD) resulting in a bandgap opening in graphene. Using a statistical analysis of scanning tunneling spectroscopy (STS) measurements, we demonstrated that the magnitude of the band gap depends on the type of deposited porphyrin molecule.The π-π stacking of FePP on graphene yielded a considerably larger band gap value (0.45 eV) than physisorbed ZnPP (0.23 eV). We proposed that the origin of different band gap value is governed due to the metallic character of the respective porphyrin. 展开更多
关键词 Band gap GRAPHENE Scanning TUNNELING Spectroscopy PORPHYRINS π-π Stacking
下载PDF
Sapo Fills the Gaps of 200 W 1064 nm Diode Pumping Modules in China
20
《光机电信息》 2006年第12期62-63,共2页
Wuhan Sapo Laser Industry Ltd.has recently introduced HipoweTM series 1064 nm high power doide laser pumping modules,which not only fill the gaps in Chinese market and end the history of importing this kind products ... Wuhan Sapo Laser Industry Ltd.has recently introduced HipoweTM series 1064 nm high power doide laser pumping modules,which not only fill the gaps in Chinese market and end the history of importing this kind products from abroad,but also have great influence on Chinese laser industry and medical laser market. 展开更多
关键词 high NM Sapo fills the gaps of 200 W 1064 nm Diode Pumping Modules in China
下载PDF
上一页 1 2 15 下一页 到第
使用帮助 返回顶部