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Stable single longitudinal mode erbium-doped silica fiber laser based on an asymmetric linear three-cavity structure 被引量:2
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作者 冯亭 延凤平 +4 位作者 李琦 彭万敬 冯素春 谭思宇 温晓东 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第1期268-272,共5页
We present a stable linear-cavity single longitudinal mode (SLM) erbium-doped silica fiber laser. It consists of four fiber Bragg gratings (FBGs) directly written in a section of photosensitive erbium-doped fiber ... We present a stable linear-cavity single longitudinal mode (SLM) erbium-doped silica fiber laser. It consists of four fiber Bragg gratings (FBGs) directly written in a section of photosensitive erbium-doped fiber (EDF) to form an asymmetric three-cavity structure. The stable SLM operation at a wavelength of 1545.112 nm with a 3-dB bandwidth of 0.012 nm and an optical signal-to-noise ratio (OSNR) of about 60 dB is verified experimentally. Under laboratory conditions, the performance of a power fluctuation of less than 0.05 dB observed from the power meter for 6 h and a wavelength variation of less than 0.01 nm obtained from the optical spectrum analyzer (OSA) for about 1.5 h are demonstrated. The gain fiber length is no longer limited to only several centimeters for SLM operation because of the excellent mode-selecting ability of the asymmetric three-cavity structure. The proposed scheme provides a simple and cost-effective approach to realizing a stable SLM fiber laser. 展开更多
关键词 asymmetric three-cavity structure single longitudinal mode erbium-doped fiber laser linear cavity
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Tri-linear interpolation-based cerebral white matter fiber imaging 被引量:2
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作者 Shan Jiang Pengfei Zhang +2 位作者 Tong Han Weihua Liu Meixia Liu 《Neural Regeneration Research》 SCIE CAS CSCD 2013年第23期2155-2164,共10页
Diffusion tensor imaging is a unique method to visualize white matter fibers three-dimensionally, non-invasively and in vivo, and therefore it is an important tool for observing and researching neural regeneration. Di... Diffusion tensor imaging is a unique method to visualize white matter fibers three-dimensionally, non-invasively and in vivo, and therefore it is an important tool for observing and researching neural regeneration. Different diffusion tensor imaging-based fiber tracking methods have been already investigated, but making the computing faster, fiber tracking longer and smoother and the details shown clearer are needed to be improved for clinical applications. This study proposed a new fiber tracking strategy based on tri-linear interpolation. We selected a patient with acute infarction of the right basal ganglia and designed experiments based on either the tri-linear interpolation algorithm or tensorline algorithm. Fiber tracking in the same regions of interest (genu of the corpus callosum) was performed separately. The validity of the tri-linear interpolation algorithm was verified by quan- titative analysis, and its feasibility in clinical diagnosis was confirmed by the contrast between tracking results and the disease condition of the patient as well as the actual brain anatomy. Statis- tical results showed that the maximum length and average length of the white matter fibers tracked by the tri-linear interpolation algorithm were significantly longer. The tracking images of the fibers indicated that this method can obtain smoother tracked fibers, more obvious orientation and clearer details. Tracking fiber abnormalities are in good agreement with the actual condition of patients, and tracking displayed fibers that passed though the corpus callosum, which was consistent with the anatomical structures of the brain. Therefore, the tri-linear interpolation algorithm can achieve a clear, anatomically correct and reliable tracking result. 展开更多
关键词 neural regeneration NEUROIMAGING diffusion tensor imaging tri-linear interpolation tensor algorithmwhite matter fiber fiber tracking magnetic resonance imaging grants-supported paper NEUROREGENERATION
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Periodic Modulation of Nonlinearity in a Two-Core Photonic Crystal Fiber: A Numerical Investigation 被引量:2
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作者 A. F. G. F. Filho A. G. L. S. O. Mendes +5 位作者 J. R. R. Sousa G. S. Batista A. M. Bastos C. S. Sobrinho M. L. Lyra A. S. B. Sombra 《Journal of Electromagnetic Analysis and Applications》 2015年第2期41-51,共11页
We present a numerical investigation of the propagation and the switching of ultra-short pulses (100 fs) in a two-core nonlinear coupler of photonic crystal fibers constructed with periodically modulated the non-linea... We present a numerical investigation of the propagation and the switching of ultra-short pulses (100 fs) in a two-core nonlinear coupler of photonic crystal fibers constructed with periodically modulated the non-linearity fiber (PMNL-PFC). Our simulations are taking into account different amplitude and frequency modulations of the PMNL-PFC. A coupler for coupling whose length is Lc = 1.8 cm, the transmission characteristics, the compression factor, the crosstalk (Xtalk) and extinction ratio (Xratio) levels of the first order solitons were studied for low to high pump energies considering 2Lc. By an analysis on the reference channel (channel 2), it is observed that at low modulation frequencies an increase occurs in the switching power increasing transmission efficiency. For high modulation frequencies, the transmitted energy efficiency loses. The switching pulses are stronger for low frequency and high amplitude modulation. The Xtalk is a function of the measurement made on the secondary channel (channel 1). It was observed that this unwanted high-frequency energy increases to lessen the measure of the amplitude modulation. In summary, we have demonstrated that introduction of a non-linearity profile takes the periodically modulated PMNL-PFC to strong variations at transmission efficiency, Xtalk, Xratio a function of frequency and modulation amplitude and the input power. 展开更多
关键词 Coupler of Photonic Crystal fibers PERIODICALLY Modulated the Non-linearity Two-Core Nonlinear Crosstalk LEVEL EXTINCTION Ratio LEVEL
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Low Density Linear Polyethylene Reinforced with Alkali and MAPE Treated Fibers from Coffee Pulp
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作者 Ahmat Tom Abel Tame +2 位作者 Paul Nestor Djomou Djonga Bakary Tigana Djonse Justin Eugenie Géraldine Nga Abena 《Open Journal of Composite Materials》 2021年第4期94-110,共17页
In this work fibers derived from coffee</span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> hulls ha</span><span style="font-f... In this work fibers derived from coffee</span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> hulls ha</span><span style="font-family:Verdana;">ve</span><span style="font-family:Verdana;"> been incorporated into Linear Low Density Polyethylene (LLDPE). The influence of the filler content on </span><span style="font-family:Verdana;">the </span><span style="font-family:Verdana;">thermal and physicomechanical properties of the composites obtained was assessed. The results showed that the incorporation of fibers was able to improve the thermostability of LLDPE/Coffee hulls fibers;comparing the treated fiber composite with untreated fiber composites, the chemical treatment reduces by 58.3% the water absorption, while increasing the elongation and tensile strength by about 48% and 17% respectively. Moreover, due to better interfacial interaction induced by MAPE, the corresponding composite exhibited better properties compared to the untreated fiber composite. Results are indicative of the fact that both mercerization and MAPE (coupling agent) have significant positive effects on the fib</span><span style="font-family:Verdana;">er</span><span style="font-family:Verdana;">-matrix interaction in terms of adhesion, wetting and dispersion, this treatment produced a better fiber distribution and consequently a more uniform composite morphology without voids and gaps between the fibers and the matrix, allowing the possibility to use higher fiber contents (up to 30% wt.) with acceptable mechanical properties. 展开更多
关键词 fiber from Coffee fiber Hull linear Low Density Polyethylene Composite MAPE
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Fiber-Optically Triggered Four Parallel GaAs Photoconductive Semiconductor Switches 被引量:1
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作者 施卫 薜红 +2 位作者 李宁 陈素果 代瑞娟 《Plasma Science and Technology》 SCIE EI CAS CSCD 2011年第6期747-750,共4页
Four parallel GaAs photoconductive semiconductor switches (PCSSs) were triggered simultaneously by four 1064 nm laser beams. The transient characteristics of four linear electrical pulses were investigated. When the... Four parallel GaAs photoconductive semiconductor switches (PCSSs) were triggered simultaneously by four 1064 nm laser beams. The transient characteristics of four linear electrical pulses were investigated. When the energy of four laser beams were 16.4 m J, 15.6 m J, 15.3 m J, and 13.7 m J, respectively, four stable electrical pulses of about 25 ns width and 10 ns rise time were obtained at the same bias voltage of 8 kV. The maximum switching voltage amplitude was 3.8 kV. With the triggering pulse energy and bias voltage kept constant, the three GaAs PCSSs were triggered at 10 Hz laser pulse. The method of synchronization calculation was given, and the synchronization of four parallel GaAs PCSSs was calculated to be 79 ps. The influence of bias voltage and laser energy on the voltage amplitude of electrical pulse was analyzed. Furthermore, relationship between the synchronization and the jitter time was also discussed. 展开更多
关键词 GAAS PCSS fiber linear mode electrical pulse SYNCHRONIZATION
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Preparation of ferromagnetic binary alloy fine fibers by organic gel-thermal reduction process 被引量:3
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作者 沈湘黔 曹凯 周建新 《中国有色金属学会会刊:英文版》 EI CSCD 2006年第5期1003-1008,共6页
Ferromagnetic metal fibers with a high aspect ratio (length/diameter) are attractive for use as high performance electromagnetic interference shielding materials. Ferromagnetic binary alloy fine fibers of iron-nickel,... Ferromagnetic metal fibers with a high aspect ratio (length/diameter) are attractive for use as high performance electromagnetic interference shielding materials. Ferromagnetic binary alloy fine fibers of iron-nickel, iron-cobalt and cobalt-nickel were prepared by the organic gel-thermal reduction process from the raw materials of critic acid and metal salts. These alloy fibers synthesized were featured with a diameter of about 1 μm and a length as long as 1 m. The structure, thermal decomposition process and morphologies of the gel precursors and fibers derived from thermal reduction of the gel precursors were characterized by FTIR, XRD, TG/DSC and SEM. The gel spinnability largely depends on the molecular structure of metal- carboxylates formed during the gel formation. The gel consisting of linear-type structural molecules shows good spinnability. 展开更多
关键词 有机凝胶热还原法 铁磁体二元合金光纤 可纺性 线性结构分子 XRD TEM SEM
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Modeling Possibilities of Very High Temperatures and Pressures at Friction Contact Plastics Filled with Glass Fibers on Steel
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作者 Dorin Rus Lucian Capitanu Liliana-Laura Badita 《材料科学与工程(中英文A版)》 2013年第10期667-677,共11页
关键词 接触压力 玻璃纤维 塑料材料 摩擦接触 温度值 钢板 建模 热塑性材料
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LLDPE/碳纤维网复合膜的制备及性能
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作者 石素宇 张学锋 +2 位作者 白雨 王利娜 辛长征 《化工新型材料》 CAS CSCD 北大核心 2024年第3期98-101,108,共5页
为了提高线型低密度聚乙烯(LLDPE)的拉伸强度和模量,将碳纤维(CF)梳理成均匀的碳纤维网,将其作为增强材料与LLDPE复合制备LLDPE/CF复合膜,综合利用热失重分析(TG)、扫描示差量热分析(DSC)、扫描电子显微镜(SEM)及拉伸测试等手段分析碳... 为了提高线型低密度聚乙烯(LLDPE)的拉伸强度和模量,将碳纤维(CF)梳理成均匀的碳纤维网,将其作为增强材料与LLDPE复合制备LLDPE/CF复合膜,综合利用热失重分析(TG)、扫描示差量热分析(DSC)、扫描电子显微镜(SEM)及拉伸测试等手段分析碳纤维网含量对复合膜结构及性能的影响。结果表明:与LLDPE膜相比,LLDPE/CF复合膜的拉伸强度和杨氏模量显著提高并随碳纤维网含量增加而增大,当碳纤维网质量分数仅为1%时,拉伸强度从10.6MPa提高到28.7MPa,提高了171%,杨氏模量由75MPa增大到1119MPa,约提高到原来的15倍;碳纤维网的引入有利于LLDPE/CF复合膜热稳定性能的提高,当碳纤维网含量仅为1%时,LLDPE/CF的初始热分解温度和最大热分解速率温度与LLDPE相比分别提高了21℃和11℃;碳纤维网的引入促进了LLDPE分子链的结晶,使LLDPE/CF复合膜的结晶度增大,有利于拉伸强度和模量提高;SEM结果显示碳纤维网与LLDPE基体间的界面结合较强,有利于力学性能的提高。研究成果可为高性能聚合物/碳纤维复合材料的制备提供实验依据和理论指导价值。 展开更多
关键词 线型低密度聚乙烯 碳纤维网 复合膜 热压成型 高性能
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Effects of Steel Fibers and Iron Filings on Thermal and Mechanical Properties of Concrete for Energy Storage Application
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作者 A.A. Adeyanju K. Manohar 《Journal of Minerals and Materials Characterization and Engineering》 2011年第15期1429-1448,共20页
An experimental study on the thermal properties of iron filings and steel-fiber-reinforced concrete for solar/thermal energy storage application is presented in this report. It takes into account the results of measur... An experimental study on the thermal properties of iron filings and steel-fiber-reinforced concrete for solar/thermal energy storage application is presented in this report. It takes into account the results of measurements of thermal conductivity, thermal resistivity, thermal diffusivity and the results of compressive strength, density as well as energy storage capacity calculated from the knowledge of the above measured parameters. The experimental testing method is described as well: based upon the linear heat source theory, it requires the use of a special probe to be inserted into the sample. The experimentation was forwarded to test concrete aggregate mixtures with three different sizes and same quantity of steel fibers;two different quantities of iron filings and one plain concrete. The measurements were carried out from the pouring time of cubic samples and were ended up when hardened conditions were achieved. The results indicate that the steel fibers and iron filings have influence on the thermal and mechanical properties of the concretes tested, thus the iron filings and steel fibers reinforced concrete is suitable for better solar/thermal energy storage due to an increase in storage capacity over plain concrete. 展开更多
关键词 Steel fiber IRON filings REINFORCED CONCRETE Thermal properties linear HEAT sourcetheory.
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High Alumina Fiber Composite SiO_2 Based Nanoporous Insulation Boards
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作者 SUN Xiaofei WANG Haimei +1 位作者 YUAN Bo WANG Gang 《China's Refractories》 CAS 2015年第4期35-38,共4页
The specimens were prepared with high alumina fiber accounting for 0. 5% , 10% or 15% by mass of the total amount of amorphous silica and high alumina fiber, using phenolic resin as binder, and extra-adding 0 or 0. 5%... The specimens were prepared with high alumina fiber accounting for 0. 5% , 10% or 15% by mass of the total amount of amorphous silica and high alumina fiber, using phenolic resin as binder, and extra-adding 0 or 0. 5% ZnO as sunscreen to cut the cost of SiO2 nanoporous insulation board. The hot volume stability and thermal conductivity (flat plate method ) of the specimens were tested and multi-Jimetion simulation equipment was used to study the thermal insulation performante. The results show that: (1) with high alumina fiber addition increasing, the linear shrinkage rate decreases, but thermal eonductivity changes a little; (2) adding ZnO can decrease thermal conductivity obviously; (3)for the specimen with ZnO and 15% of high alumina fiber, its cold face temperature hardly rises during the simulation experiment at 1 000 ℃ for 2 h, and the cold face temperature of the specimen with the smallest thickness of 2 cm doesn't exceed 180 ℃. 展开更多
关键词 high alumina fiber SILICA nano-pore insulation material linear shrinkage rate thermal conductivity zinc oxide
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不同截面类型玻纤增强PA6的性能
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作者 孟凡地 吴承然 +3 位作者 易琪伟 王彩 孙照亮 邓娇 《工程塑料应用》 CAS CSCD 北大核心 2024年第7期43-48,共6页
对比研究了扁平玻纤及圆形玻纤增强尼龙6 (PA6)复合材料的力学性能、流动性能、收缩翘曲情况、摩擦性能及线膨胀系数(CLTE)。结果表明,随着玻纤含量增加,扁平玻纤及圆形玻纤增强PA6复合材料力学性能均增加,但熔体流动速率(MFR)降低;相... 对比研究了扁平玻纤及圆形玻纤增强尼龙6 (PA6)复合材料的力学性能、流动性能、收缩翘曲情况、摩擦性能及线膨胀系数(CLTE)。结果表明,随着玻纤含量增加,扁平玻纤及圆形玻纤增强PA6复合材料力学性能均增加,但熔体流动速率(MFR)降低;相同玻纤含量下,与圆形玻纤相比,扁平玻纤增强PA6复合材料的拉伸强度、弯曲强度及弯曲弹性模量较低,简支梁缺口冲击强度及MFR较高。在玻纤含量30%的条件下,不同扁平玻纤及圆形玻纤增强PA6复合材料性能存在差异,通过收缩率测试分析,扁平玻纤复合材料比圆形玻纤具有更低的收缩率及横纵收缩比,扁平比越高,横纵收缩比越低,翘曲度越小;通过MFR及注塑螺旋线测试,发现扁平玻纤复合材料具有更好流动性、更高流长比,扁平比越高优势越明显,有利于成型加工;通过滑动摩擦测试结果看出,扁平玻纤复合材料具有更低摩擦系数,随着扁平比增大,摩擦系数越低;通过热机械分析检测,扁平玻纤复合材料在垂直流动方向CLTE低于圆形玻纤,且流动方向和垂直流动方向CLTE差异也较小。扁平玻纤增强材料能改善传统圆形玻纤增强体系的一些不足,优化产品性能。 展开更多
关键词 尼龙6 扁平玻纤 收缩率 流长比 线膨胀系数
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聚丙烯纤维对刚玉-六铝酸钙浇注料抗热震性能的影响
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作者 田朋丹 王刚 +3 位作者 杜鹏辉 冯海霞 王来稳 潘元帅 《耐火材料》 CAS 北大核心 2024年第3期208-212,共5页
为改善刚玉-六铝酸钙浇注料的性能,以刚玉、六铝酸钙(CA_(6))、活性α-Al_(2)O_(3)微粉为主要原料,在1550℃保温4 h,制备了水合氧化铝结合的刚玉-CA_(6)浇注料,研究了不同聚丙烯纤维加入量(外加质量分数分别为0、0.04%、0.08%、0.12%和0... 为改善刚玉-六铝酸钙浇注料的性能,以刚玉、六铝酸钙(CA_(6))、活性α-Al_(2)O_(3)微粉为主要原料,在1550℃保温4 h,制备了水合氧化铝结合的刚玉-CA_(6)浇注料,研究了不同聚丙烯纤维加入量(外加质量分数分别为0、0.04%、0.08%、0.12%和0.16%)对刚玉-CA_(6)浇注料性能尤其是抗热震性的影响。结果表明:1)聚丙烯纤维的加入可使试样平均线膨胀系数减小,但会导致试样强度和体积密度有所降低,进而导致弹性模量减小;2)适量聚丙烯纤维的加入可改善试样抗热震性,但过量的聚丙烯纤维会导致材料内部结构疏松、致密度减小,试样抗热震性反而有所降低;3)聚丙烯纤维加入量为0.08%(w)时,常温抗折强度保持率最高,为53.5%,表现出最佳的抗热震性能。 展开更多
关键词 刚玉-CA_(6)浇注料 聚丙烯纤维 抗热震性 平均线膨胀系数 弹性模量
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颜料与线密度对原液着色涤纶短纤维及纱线颜色的影响
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作者 卢韵静 王雪 +3 位作者 齐元章 宋琳 廉志军 李鑫 《纺织学报》 EI CAS CSCD 北大核心 2024年第3期97-105,共9页
为掌握原液着色涤纶短纤维的颜色对其纱线颜色变化的影响规律,选取红、黄、蓝3种颜色半消光原液着色涤纶短纤维,根据实际生产中主要调整的参数,系统研究了颜料质量分数、纤维线密度对其色度值的影响规律;同时,考察了从纤维到纱线(线密度... 为掌握原液着色涤纶短纤维的颜色对其纱线颜色变化的影响规律,选取红、黄、蓝3种颜色半消光原液着色涤纶短纤维,根据实际生产中主要调整的参数,系统研究了颜料质量分数、纤维线密度对其色度值的影响规律;同时,考察了从纤维到纱线(线密度为20 tex,捻系数为300)的色度值变化,并与特定规格半消光染色短纤维、大有光原液着色短纤维进行对比。结果表明:颜料质量分数显著影响半消光纤维的色度值,在浅、中色之间的差异尤为明显,是中、深色之间的2倍;线密度对纤维色差(ΔE_(CMC(2∶1)))的影响不大,黄色的色差变化较红色、蓝色更明显;半消光原液着色短纤维到纱线的色度值变化不明显,色差在0.8~2.6范围内;在半消光染色纤维中,黄色的色差变化偏大,为3.4~3.9,红色、蓝色与原液着色的色差相当;大有光原液着色涤纶短纤维到纱线的变化与半消光染色短纤维的更为相似,二者的色差ΔE_(CMC(2∶1))、明度差ΔL、饱和度差ΔC以及色调差ΔH基本相同,说明对于特定的颜色类型,可借鉴染色纱线的配色经验,为原液着色纱线配色模型的系数调整提供支持。 展开更多
关键词 涤纶短纤维 原液着色纤维 颜料 线密度 色度值 纱线配色
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一类耦合非线性薛定谔方程组的求解
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作者 仁世杰 李永军 张娟 《兰州文理学院学报(自然科学版)》 2024年第1期39-43,共5页
在可积条件[HJ41x]c(t)=(γ2(t))2=1(C 1t+C 2)2,γ1(t)=γ2(t)=1 C 1t+C 2下,利用特殊变换法和Sine-cosine方法,得到了双芯光纤变系数线性耦合薛定谔方程组i∂∂t u(x,t)+i∂∂x u(x,t)-∂2∂t 2 u(x,t)+γ1(t)u(x,t)2u(x,t)+c(t)v(x,t)=0,i∂... 在可积条件[HJ41x]c(t)=(γ2(t))2=1(C 1t+C 2)2,γ1(t)=γ2(t)=1 C 1t+C 2下,利用特殊变换法和Sine-cosine方法,得到了双芯光纤变系数线性耦合薛定谔方程组i∂∂t u(x,t)+i∂∂x u(x,t)-∂2∂t 2 u(x,t)+γ1(t)u(x,t)2u(x,t)+c(t)v(x,t)=0,i∂∂t v(x,t)+i∂∂x v(x,t)-∂2∂t 2 v(x,t)+γ2(t)v(x,t)2v(x,t)+[HJ]c(t)u(x,t)=0的精确解.其中:C i(i=1,2)是常数;γi(t)(i=1,2)是第i个纤芯的非线性参数;c(t)是两个纤芯之间的线性耦合参数. 展开更多
关键词 双芯光纤 线性耦合 薛定谔方程 可积 Sine-cosine方法
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基于分段线性均值修正的风电叶片疲劳寿命计算方法
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作者 谢利来 胡聪良 +2 位作者 董敏 杨晓辉 刘鹏辉 《复合材料科学与工程》 CAS 北大核心 2024年第8期62-69,共8页
随着风电机组的大型化,疲劳强度设计成为大型风电叶片设计中的最为关键因素之一。目前风电叶片疲劳寿命的计算方法主要采用传统的简化算法,该方法存在诸多的简化与假设,并不能很好地预测风电叶片实际的疲劳损伤,所以需要一种更为合理的... 随着风电机组的大型化,疲劳强度设计成为大型风电叶片设计中的最为关键因素之一。目前风电叶片疲劳寿命的计算方法主要采用传统的简化算法,该方法存在诸多的简化与假设,并不能很好地预测风电叶片实际的疲劳损伤,所以需要一种更为合理的疲劳寿命计算方式。本文根据IEC 61400-5中提出的分段线性均值修正的方法,基于Goodman线性均值修正理论,结合多条已知的疲劳S-N曲线,提出了一种适合大型风电叶片疲劳寿命的计算方法。以目前应用较为广泛的玻纤拉挤板作为分析对象,对比分析了线性均值修正与分段线性均值修正两种方法的差异,最后通过对风电叶片实际疲劳试验损伤的分析以及大型风电叶片主梁疲劳强度的分析,得出如下结论:(1)玻纤拉挤板的疲劳性能并不是线性变化,基于单一S-N曲线的线性预测结果与测试结果存在较大误差,玻纤拉挤板更适合采用基于多条S-N曲线的分段线性CLD模型来描述其疲劳性能的变化,且分段线性均值修正疲劳寿命计算方法能更好地预测试验叶片实际疲劳损伤;(2)叶片设计中更应该关注PS侧主梁的疲劳强度,建议采用基于多条疲劳S-N曲线的分段线性均值修正疲劳寿命计算方法对大型风电叶片的疲劳强度进行计算,提高叶片疲劳设计的可靠性。 展开更多
关键词 风电叶片 疲劳寿命 均值修正 玻纤拉挤板 分段线性 复合材料
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全自动多功能单纤维测试仪的研制和开发
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作者 封妍君 毛绪国 《合成纤维》 CAS 2024年第7期42-45,共4页
全自动多功能单纤维测试仪不仅将单纤维强伸度仪、振动式线密度仪和自动卷曲弹性仪的功能结合为一体,还解决了短纤维测试的关键难点,即纤维的夹持和转移。使用该仪器对不同规格的涤纶短纤维样品进行初步测试,试验结果表明该仪器实现了... 全自动多功能单纤维测试仪不仅将单纤维强伸度仪、振动式线密度仪和自动卷曲弹性仪的功能结合为一体,还解决了短纤维测试的关键难点,即纤维的夹持和转移。使用该仪器对不同规格的涤纶短纤维样品进行初步测试,试验结果表明该仪器实现了短纤维线密度、强伸和卷曲的连续测试,满足试验方法要求,提高了检测效率,填补了该领域的空白。 展开更多
关键词 全自动多功能单纤维测试仪 涤纶短纤维 线密度 卷曲 强伸
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全光纤电流互感器灵敏度特性研究 被引量:25
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作者 肖智宏 程嵩 +3 位作者 张国庆 郭志忠 闫培丽 于文斌 《电力自动化设备》 EI CSCD 北大核心 2017年第1期212-216,共5页
在全光纤电流互感器理想数学模型基础上,建立了全光纤电流互感器灵敏度特性数学模型,该模型揭示了单位长度线性双折射、传感环半径和光纤缠绕匝数是影响全光纤电流互感器灵敏度的3个主要因素,并得出结论:最优光纤长度时全光纤电流互感... 在全光纤电流互感器理想数学模型基础上,建立了全光纤电流互感器灵敏度特性数学模型,该模型揭示了单位长度线性双折射、传感环半径和光纤缠绕匝数是影响全光纤电流互感器灵敏度的3个主要因素,并得出结论:最优光纤长度时全光纤电流互感器灵敏度最高,且最优光纤长度只与单位长度线性双折射有关;全光纤电流互感器灵敏度随着光纤缠绕匝数增多而增大,且增大到最优光纤缠绕匝数时,全光纤电流互感器灵敏度最高。进而提出利用有效匝数来平衡灵敏度和光纤利用率。实验验证了理论分析结果的正确性。 展开更多
关键词 全光纤电流互感器 灵敏度 线性双折射 传感环半径 光纤缠绕匝数 比差
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适用于金属薄板焊接的柔性光纤耦合半导体激光加工光源(英文) 被引量:15
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作者 张俊 彭航宇 +2 位作者 刘云 秦莉 王立军 《发光学报》 EI CAS CSCD 北大核心 2012年第8期895-900,共6页
研制了一种单光纤耦合的柔性半导体激光加工光源,该光源由20个传导热沉封装的激光列阵以线阵合束方式耦合而成,在大通道工业水冷条件下,从600μm芯径、NA为0.2的光纤中连续输出907 W功率,输出光束质量为47 mm·mrad,最终达到工件表... 研制了一种单光纤耦合的柔性半导体激光加工光源,该光源由20个传导热沉封装的激光列阵以线阵合束方式耦合而成,在大通道工业水冷条件下,从600μm芯径、NA为0.2的光纤中连续输出907 W功率,输出光束质量为47 mm·mrad,最终达到工件表面的功率密度为3.21×105W/cm2,最大插头效率达39%。该激光光源具有直接应用在金属薄板焊接的潜力。 展开更多
关键词 半导体激光 线阵合束 光纤耦合 柔性加工光源
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用于高速线阵CCD的数据获取系统 被引量:3
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作者 刘志艳 陈香才 +4 位作者 江晓山 章红宇 向海生 梁忠望 胡俊 《核电子学与探测技术》 CAS CSCD 北大核心 2010年第6期722-725,共4页
介绍一种高速线阵CCD(Charge Coupled Device,光电耦合器件)的数据获取系统。该系统采用了光纤传输,数据通过PCI或USB接口送入计算机。主要介绍了整个数据获取系统的搭建,PCI接口端硬件、软件的设计和上位机数据获取程序的设计。
关键词 线阵CCD 光纤 PCI LABVIEW 数据获取
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FFP边带滤波技术研究 被引量:2
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作者 巩宪锋 王长松 +1 位作者 郭转运 吕可诚 《半导体光电》 CAS CSCD 北大核心 2004年第1期72-75,共4页
 以双光束干涉原理为基础,推导了光纤法布里 珀罗腔(FFP)边带滤波器的反射率方程,讨论了端面反射率对其特性的影响;通过与光纤迈克尔逊、M Z解调方法比较分析了FFP边带滤波器的热稳定性问题;对FFP在光纤光栅传感解调中的应用,采用泰勒...  以双光束干涉原理为基础,推导了光纤法布里 珀罗腔(FFP)边带滤波器的反射率方程,讨论了端面反射率对其特性的影响;通过与光纤迈克尔逊、M Z解调方法比较分析了FFP边带滤波器的热稳定性问题;对FFP在光纤光栅传感解调中的应用,采用泰勒展开方法进行了一阶线性近似,用线性边带滤波方法实现了布拉格光纤光栅传感器的应变测量,最大测量误差为3.8个微应,满量程测量精度为6‰,能满足一般工业测量应用。 展开更多
关键词 光纤法布里—珀罗腔 边带滤波 光纤光栅 波长解调
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