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| 1 | TFT-LCD Touch Mura不良的研究和改善显示文摘Touch Mura在整个TFT-LCD制作流程中非常容易发生,并且严重影响产品性能。文章主要研究了液晶量、Sub PS设计、PS段差设计及工艺参数Total pitch对Touch Mura的影响。实验结果表明液晶量的增加能够补偿敲击偏移,减轻Touch Mura不良;Sub PS的Z字形设计由于阻挡效应能够有效减轻Touch Mura;Main PS和Sub PS的段差越大,Touch Mura margin越小;工艺参数Total Pitch越接近设计值,Touch Mura风险越小。所以在设计过程中优化液晶量和Main-Sub PS段差设计及Sub PS设计能够有效减低Touch Mura风险,此外,生产过程中对工艺参数Total pitch的管控也至关重要。 | 齐鹏 施园 刘子源 | 2013 | 液晶与显示2013，28，2： | 24 |
| 2 | 微小盲孔于电镀制作的困难点与产品可靠性探讨显示文摘随着3G通信技术在中国的开放,拉开了3G手机的帷幕。3G乃至4G以上的相关移动通讯产品功能的增加,使HDI(高密度印制电路板)朝向四个技术趋势发展:一是高阶层,基本为二阶HDI结构,部分甚至需要三,四阶的HDI结构;二是缩小线宽间距,线宽间距基本在75μm左右,更小的达到50~60μm;三是堆叠设计的盲孔与电镀铜填孔;四是微盲孔的直径和焊盘的直径越来越小,微盲孔孔径发展需求从0.10mm(4mil)缩小到0.075mm(3mil)乃至0.050mm(2mil)。通讯产品功能的增加,将促使HDI高集成化发展,盲孔孔径微小化是HDI高集成化发展的一个重要方向;本文主要探讨盲孔孔径微小化后对电镀加工制作的困难度与信赖性要求。盲孔孔径从4mil发展到3mi l乃至2mi l后对电镀制程的相关搭配,以及我们应该采用何种微盲孔电镀方式来提高微盲孔的可靠性,确保微盲孔可靠性可达到相关信赖性的要求。 | 陈文德 陈臣 | 2009 | 印制电路信息2009，0，S1： | 10 |
| 3 | Calculation and characteristics analysis of blade pitch loads for large scale wind turbines显示文摘Based on the electric pitch system of large scale horizontal-axis wind turbines,the blade pitch loads coming mainly from centrifugal force,aerodynamic force and gravity are analyzed,and the calculation models for them are established in this paper.For illustration,a 1.2 MW wind turbine is introduced as a practical sample,and its blade pitch loads from centrifugal force,aerodynamic force and gravity are calculated and analyzed separately and synthetically.The research results showed that in the process of rotor rotating 360o,the fluctuation of blade pitch loads is similar to cosine curve when the rotor rotational speed,in-flow wind speed and pitch angle are constant.Furthermore,the amplitude of blade pitch load presents quite a difference at a different pitch angle.The ways of calculation for blade pitch loads are of the universality,and are helpful for further research of the individual pitch control system. | DAI JuChuan1,2,HU YanPing1,LIU DeShun1,2 & LONG Xin3 1 School of Electromechanical Engineering,Hunan University of Science and Technology,Xiangtan 411201,China 2 College of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China 3 Hara XEMC Windpower Co.,Ltd.,Xiangtan 411000,China | 2010 | Science China(Technological Sciences)2010，53，5： | 7 |
| 4 | Synthesis of fluorescent carbon quantum dots from aqua mesophase pitch and their photocatalytic degradation activity of organic dyes显示文摘A synthesis strategy of fluorescent carbon quantum dots(CQDs) with high quantum yield(QY) using aqua mesophase pitch(AMP) as the carbon source has been developed via the hydrothermal method in this study. The hydrothermal temperature and soaking time have important effects on the morphology and QY of CQDs. As-prepared CQDs at 120℃ holding for 24 h(CQDs-120-24) have the uniform size of about 2.8 nm, and the QY can reach 27.6%. The obtained CQDs are successfully modified with ammonia and thionyl chloride, respectively, and they exhibit an excellent photocatalytic performance on degrading rhodamine B(Rh B), methyl blue(MB) and indigo carmine(IC). Importantly, the degradation percentage of N-CQDs on Rh B under natural light for 4 h reaches 97% with the degradation rate constant of 0.02463 min^(-1) and it can maintain 93% after repetitively used 5 times. The results indicate that these as-prepared CQDs have the potential application in degrading organic dyes. | Youliang Cheng Mengsha Bai Jian Su Changqing Fang Hang Li Jing Chen Jieming Jiao | 2019 | Journal of Materials Science & Technology2019，35，8： | 6 |
| 5 | The recent progress of pitch-based carbon anodes in sodium-ion batteries显示文摘Sodium-ion batteries(SIBs)have attracted significant attentions as promising alternatives to lithium-ion batteries for large-scale energy storage applications.Here carbon materials are considered as the most competitive anodes for SIBs based on their low-cost,abundant availability and excellent structural stability.Pitch,with high carbon content and low cost,is an ideal raw precursor to prepare carbon materials for large-scale applications.Nevertheless,the microstructures of pitch-based carbon are highly ordered with smaller interlayer distances,which are unfavorable for Na ion storage.Many efforts have been made to improve the sodium storage performance of pitch-based carbon materials.This review summarizes the recent progress about the application of pitch-based carbons for SIBs anodes in the context of carbon’s morphology and structure regulation strategies,including morphology adjustment,heteroatoms doping,fabricating heterostructures,and the increase of the degree of disorder.Besides,the advantages,present challenges,and possible solutions to current issues in pitch-based carbon anode are discussed,with the highlight of future research directions.This review will provide a deep insight into the development of low-cost and high-performance pitch-based carbon anode for SIBs. | Mingchi Jiang Ning Sun Razium Ali Soomro Bin Xu | 2021 | Journal of Energy Chemistry2021，30，4： | 5 |
| 6 | Experimental Investigation of the Resistance Performance and Heave and Pitch Motions of Ice-Going Container Ship Under Pack Ice Conditions显示文摘In order to analyze the ice-going ship's performance under the pack ice conditions, synthetic ice was introduced into a towing tank. A barrier using floating cylinder in the towing tank was designed to carry out the resistance experiment. The test results indicated that the encountering frequency between the ship model and the pack ice shifts towards a high-velocity point as the concentration of the pack ice increases, and this encountering frequency creates an unstable region of the resistance, and the unstable region shifts to the higher speed with the increasing concentration. The results also showed that for the same speed points, the ratio of the pack ice resistance to the open water resistance increases with the increasing concentration, and for the same concentrations, this ratio decreases as the speed increases. Motion characteristics showed that the mean value of the heave motion increases as the speed increases, and the pitch motion tends to increase with the increasing speed. In addition, the total resistance of the fullscale was predicted. | GUO Chun-yu XIE Chang ZHANG Jin-zhao WANG Shuai ZHAO Da-gang | 2018 | China Ocean Engineering2018，32，2： | 5 |
| 7 | Non-enhanced Low-tube-voltage High-pitch Dual-source Computed Tomography with Sinogram Affirmed Iterative Reconstruction Algorithm of the Abdomen and Pelvis显示文摘Objective To investigate the image quality, radiation dose and diagnostic value of the low-tube-voltage high-pitch dual-source computed tomography(DSCT) with sinogram affirmed iterative reconstruction(SAFIRE) for non-enhanced abdominal and pelvic scans. Methods This institutional review board-approved prospective study included 64 patients who gave written informed consent for additional abdominal and pelvic scan with DSCT in the period from November to December 2012. The patients underwent standard non-enhanced CT scans(protocol 1) [tube voltage of 120 k Vp/pitch of 0.9/filtered back-projection(FBP) reconstruction] followed by high-pitch non-enhanced CT scans(protocol 2)(100 k Vp/3.0/SAFIRE). The total scan time, mean CT number, signal-to-noise ratio(SNR), image quality, lesion detectability and radiation dose were compared between the two protocols. Results The total scan time of protocol 2 was significantly shorter than that of protocol 1(1.4±0.1 seconds vs. 7.6±0.6 seconds, P<0.001). There was no significant difference between protocol 1 and protocol 2 in mean CT number of all organs(liver, 55.4±6.3 HU vs. 56.1±6.8 HU, P=0.214; pancreas, 43.6±5.9 HU vs. 43.7±5.8 HU, P=0.785; spleen, 47.9±3.9 HU vs. 49.4±4.3 HU, P=0.128; kidney, 32.2±2.3 HU vs. 33.1±2.3 HU, P=0.367; abdominal aorta, 44.8±5.6 HU vs. 45.0±5.5 HU, P=0.499; psoas muscle, 50.7±4.1 HU vs. 50.3±4.5 HU, P=0.279). SNR on images of protocol 2 was higher than that of protocol 1(liver, 5.0±1.2 vs. 4.5±1.1, P<0.001; pancreas, 4.0±1.0 vs. 3.6±0.8, P<0.001; spleen, 4.7±1.0 vs. 4.1±0.9, P<0.001; kidney, 3.1±0.6 vs. 2.8±0.6, P<0.001; abdominal aorta, 4.1±1.0 vs. 3.8±1.0, P<0.001; psoas muscle, 4.5±1.1 vs. 4.3±1.2, P=0.012). The overall image noise of protocol 2 was lower than that of protocol1(9.8±3.1 HU vs. 11.1±3.0 HU, P<0.001). Image quality of protocol 2 was good but lower than that of protocol 1(4.1±0.7 vs. 4.6±0.5, P<0.001). Protocol 2 perceived 229 of 234 lesions(97.9%) that were detected in protocol 1 in the abdomen and pelvis. Radiation dose of protocol 2 was lower than that of protocol 1(4.4±0.4 m Sv vs. 7.3±2.4 m Sv, P<0.001) and the mean dose reduction was 41.4%. Conclusion The high-pitch DSCT with SAFIRE can shorten scan time and reduce radiation dose while preserving image quality in non-enhanced abdominal and pelvic scans. | Hao Sun Hua-dan Xue Zheng-yu Jin Xuan Wang Yu Chen Yong-lan He Da-ming Zhang Liang Zhu | 2014 | Chinese Medical Sciences Journal2014，29，4： | 3 |
| 8 | A solvothermal pre-oxidation strategy converting pitch from soft carbon to hard carbon for enhanced sodium storage显示文摘Due to its low cost and easy availability, the pitch is considered a promising precursor for soft carbon anodes. However, pitch-derived soft carbon shows a high graphitization degree and small interlayer spacing, resulting in its much lower sodium storage performance than hard carbon. We propose a novel preoxidation strategy to introduce additional oxygen atoms into the low-cost soft carbon precursor pitch to fabricate a defect-rich and large-interlayer spacing hard carbon anode(HPP-1100). Compared with the direct pyrolysis of pitch carbon, the sodium storage capacity of HPP-1100 is significantly improved from 120.3 m Ah/g to 306.7 m Ah/g, with an excellent rate and cycling capability(116.5 m Ah/g at 10 C). Moreover, when assorted with an O_(3)-Na(NiFeMn)1/3O_(2)cathode, the full cell delivers a high reversible capacity of 274.0 m Ah/g at 0.1 C with superb cycle life. This work provides a new solution for realizing the application of low-cost pitch anodes in Na-ion batteries. | Jing Wang Lei Yan Binhua Liu Qingjuan Ren Linlin Fan Zhiqiang Shi Qingyin Zhang | 2023 | Chinese Chemical Letters2023，34，4： | 3 |
| 9 | Numerical study of air layer drag reduction of an axisymmetric body in oscillatory motions显示文摘The air layer drag reduction(ALDR)of an axisymmetric body in oscillatory motions is investigated in this paper with open source toolbox OpenFOAM.The unsteady Reynolds-averaged Navier-Stokes(URANS)equations are used to determine the viscous flow and the volume of fluid(VOF)model is adopted to capture the interface of the air-water two-phase flow.The k-e turbulence model is adopted to simulate the turbulence.The dynamic mesh technique is applied to model the movement of the axisymmetric body.Firstly,the ALDR results are validated by the experimental data.Then,the effects of the movements of the body on the drag reduction during the ALDR state are investigated.Two representative kinds of movements are considered,namely,the pitch and the heave.The numerical results show that the drag reduction varies during the movements and the average drag reduction rates will be reduced.The variation of the drag reduction is related to the morphological change of the air layer.The heave motion is more likely to reduce the effects of the ALDR than the pitch motion.For both oscillatory motions,the large motion amplitude and the low motion period are not conductive to improving the effects of the ALDR.The effects of the oscillatory motion on the ALDR are more sensitive at high water speeds than at low water speeds.Besides,increasing the air flow ratio can be considered as one way to improve the effects of the ALDR. | Xiao-jie Zhao Zhi Zong Yi-chen Jiang | 2021 | Journal of Hydrodynamics2021，33，5： | 2 |
| 10 | A PATTERN RECOGNITION APPROACH FOR TONE CLASSIFICATION OF ISOLATED SYLLABLE IN PUTONGHUA显示文摘In this paper,a new approach of pattern recognition for tone classification of Putonghua Which is im-portant for speech recognition of Putonghua is discribed.In this method,four parameters of the fundamen-tal frequency trajectory are selected based on a large number of statistical experiments.It is assumed thatthe four parameters satisfy multidimensional Gaussion distribution and a non-Euclidean distancefunction for each tone class is derived according to the rule of minimum probability of calssification error.the optimal decision results are obtained in a sense of statistics.It is proved that this method provides verysatisfactory results by the experiments for speaker-independent tone classification of Putonghua. | HUANG Zezhen and YANG Xingjun(Department of Radio Electronics . Tsinghua University ) | 1989 | Chinese Journal of Acoustics1989，8，4： | 1 |
| 11 | Interaction between electromagnetic waves and energetic particles by a realistic density model显示文摘Using a realistic density model,we present a first study on the interactions between electromagnetic waves and energetic particles in the inner magnetosphere.Numerical calculations show that as the latitude λ increases,the number density ne increases,and resonant frequency range moves to lower pitch angles.During L-mode/electron and L-mode/proton interactions,the pitch angle diffusion dominates over the momentum diffusion.This indicates that L-mode waves are primarily responsible for pitch angle scattering.For R-mode/electron interaction,the momentum diffusion is found to be comparable to the pitch angle diffusion,implying that R-mode waves can play an important role in both pitch angle scattering and stochastic acceleration of electrons.For R-mode/proton interaction,diffusion coefficients locate primarily below pitch angle 60° and increase as kinetic energy increases,suggesting that R-mode waves have potential for pitch angle scattering of highly energetic (~1 MeV) protons but cannot efficiently accelerate protons. | HE YiHua1,2,CHEN LiangXu1,XIAO FuLiang1 & YANG Chang1 1 School of Physics and Electronic Sciences,Changsha University of Science and Technology,Changsha 410004,China 2 State Key Laboratory of Space Weather,Chinese Academy of Sciences,Beijing 100190,China | 2010 | Science China(Technological Sciences)2010，53，9： | 1 |
| 12 | Pitch control strategy before the rated power for variable speed wind turbines at high altitudes显示文摘The wind turbines in the world's highest wind farm with an altitude of over 4 000 m in Naqu county of China were put into operation in 2014.Compared with the wind turbines at lower altitudes,the rated wind speed of these wind turbines are much larger,and the corresponding tip-speed ratio at the rated power reduces significantly due to the lower air density.Hence,the power coefficient at the point of the rated power is decreased to a rather low level.To improve the performance of the wind turbines at very high altitudes,this paper proposes a new pitch control strategy for variable speed wind turbines at the constant-speed phase,especially at the rated-speed phase before the rated power is reached.It is shown that the new pitch control strategy works very well for the wind farms at very high altitude and with low air density,with the catch of the wind energy enhaneed and the aerodynamic loads significantly reduced. | Ming-wei Ge Wei-ming Ke Hong-xia Chen | 2019 | Journal of Hydrodynamics2019，31，2： | 1 |
| 13 | INVESTIGATION OF UNSTEADY EXCITATION EFFECTS ON AERODYNAMIC PROPERTIES OF AIRFOILS显示文摘In this paper, the techniques to manage and control the flow over airfoils by using the external unsteady excitations are investigated. The mechanisms of these excitation effects are also explored. The principal goal of this study is to gain a better understanding and to find the possible ways for enhancing the aerodynamic efficients. The experimental investigations are carried out in two low-speed wind tunnels. The test models are two dimensional airfoils with different section geometries. Four means of excitations have been used in these experiments. (1) The pitch oscillation of the airfoil high-angle-of-attack situation. (2) The moving surface effects of the airfoil with a leading edge rotating cylinder. (3) Oscillating leading edge flaperon. (4) Small oscillating spoiler located near the leading edge of the airfoil. The lift, drag and pitch moment coefficients are measured in these experiments. But, we will put the emphasis only on the 'dynamic amplifying effects' on aerodynamic lift in this paper. | Cui E J, Fu G M Yu X T Beijing Institute of Aerodynamics P.O. Box 7215, Beijing, China | 1991 | Chinese Journal of Aeronautics1991，6，2： | 1 |
| 14 | Friction and wear characteristics of robust carbon–carbon composites developed solely from petroleum pitch without reimpregnation显示文摘Friction and wear characteristics correlating the fiber reinforcement percentage of carbon–carbon (C/C) composites solely developed from petroleum pitch matrices were investigated. This study exhibits the tribo-characteristics of C/C composites developed in a single-step carbonization process for varying loads for the first time without a reimpregnation process. A pin-on-disc tribometer with a sliding speed of 0.5 m/s and loads of 5, 10, and 20 N with a flat tool grade stainless steel pin as a static partner was employed. Further, polarized light optical and scanning electron microscopes (SEM) were utilized for a morphological analysis. Elastic modulus and strength were determined by a compression test. A result analysis is conducted to analyze sliding wear accompanied with minor abrasion. The composites with a high percentage of reinforcement exhibit credible wear resistance and mechanical robustness. | Shishobhan SHARMA Bharat PATEL Rasmika PATEL | 2020 | Friction2020，8，5： | 1 |
| 15 | Seabeam 2112系统在南海首次调查显示文摘本文主要介绍Seabeam 2112多波束等深刈幅测量系统,对系统参数、性能、精度的测试调试及对南海北坡海山区域进行调查。最后对该系统的几点认识。 | 周华诚 | 1996 | 海洋测绘1996，17，1： | 1 |
| 16 | IC设计中的建库技术研究及实现显示文摘随着数字电子技术的迅速发展,基于设计的标准单元已经成为主流的设计风格。主要改进了标准单元库中版图库的建库技术,接着结合与门版图设计实例详细讲解了这些建库技术的应用。 | 黄义定 | 2005 | 微计算机信息2005，21，11Z： | 1 |
| 17 | 教育目标分类学提纲动作技能领域(二)显示文摘 | | 1986 | 华东师范大学学报(教育科学版)1986，4，4： | 1 |
| 18 | Close up observation and inversion of low-altitude ENA emissions during a substorm event显示文摘During a series of substorm events on November 12 2004, the Neutral Atom Detector Unit(NUADU) flying onboard the TC-2 spacecraft observed, close to perigee, bright low-altitude Energetic Neutral Atom(ENA) emissions from both north and south poles. Through utilizing high temporal and spatial resolution data inversion techniques we present here a global view the associated processes of energetic ion deposition and injection at the uniquely high temporal resolution of a few minutes. It is demonstrated that the ENA emissions observed came mainly from the, low-altitude, high magnetic latitude polar region. Since precipitating ions follow magnetic field lines and have more chance to produce ENA emissions through charge exchange there.Therefore, the employment of a low-orbit satellite to record at high temporal and spatial resolution ENA image data is inferred to be the best way to monitor those dynamic ring current variations that occur during geomagnetic activity. | Li LU Susan MCKENNA-LAWLOR Jan BALAZ | 2019 | Science China Earth Sciences2019，62，6： | 1 |
| 19 | 无姿态补偿的水下信标绝对位置传递研究显示文摘文章介绍了长基线系统(Long Baseline)相对和绝对校准工作,分析了姿态补偿纵摇(Pitch)和横摇(Roll)对水下信标定位精度的影响机理,对无姿态补偿的绝对位置传递的可行性进行了可行分析研究,给出了基于最小二乘的信标位置计算方法。分析计算了Pitch和Roll的影响。对比了计算得到的无姿态补偿的结果与有姿态补偿结果符合情况及差异,得出了无姿态补偿计算结果可信的结论。该方法满足大多数水下定位作业的要求。利用该方法进行了海上实地测试,验证了通过多个水下信标构成的基阵,在进行相对校准和绝对校准后,在无姿态补偿情况下亦可以完成水下构件安装等高精度水下工程。 | 田春和 王崇明 | 2015 | 水道港口2015，36，1： | 1 |
| 20 | ACOUSTICAL PROPERTIES OF QING显示文摘The qing was an important percussion musical instrument in ancient China.Qing is a stone plate withspecial form.The vibration of qing is studied both theoretically and experimentally in this paper.Thevibrational modes of a qing have been calculated by using finite element method in accordance with the ex-perimental results.As compared with a rectangular plate,the frequency relations between the overtones arevaried with the changes of shape of the qing.From the analysis,it is possible to speculate upon the idea ofdesign of the qing in ancient time.In order to confirm the idea,the sound of qing has been simulated bycomputer and judged subjectively.An empirical formula for the calculation of the pitch frequency of qingsound is given. | CHEN Tong(Institute of Acoustics Academa Sinica)WANG Zhongyan(Keli High Technology Corporation) | 1989 | Chinese Journal of Acoustics1989，8，4： | 1 |
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