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| 1 | Shape optimization of 3D curved slots and its application to the squirrel-cage elastic support design显示文摘The squirrel-cage elastic support is one of the most important components of an aero-engine rotor system.A proper structural design will favor the static and dynamic performances of the system.In view of the deficiency of the current shape optimization techniques,a new mapping approach is proposed to define shape design variables based on the parametric equations of 3D curves and surfaces.It is then applied for the slot shape optimization of a squirrel-cage elastic support.To this end,an automatic design procedure that integrates the Genetic Algorithm (GA) is developed to solve the problem.Two typical examples with different shape constraints are considered.Numerical results provide reasonable optimum designs for the improvement of stiffness and strength of the squirrel-cage elastic support. | WANG Dan,ZHANG WeiHong*,WANG ZhenPei & ZHU JiHong Engineering Simulation and Aerospace Computing,The Key Laboratory of Contemporary Design & Integrated Manufacturing Technology,Northwestern Polytechnical University,Xi’an 710072,China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，10： | 8 |
| 2 | 脊柱全景成像技术在脊柱侧弯摄影中的应用显示文摘目的探讨脊柱全景成像检查技术在脊柱侧弯摄影中的应用价值。方法采用Slot检查技术46例脊柱侧弯患者(A组),其中男性19例,女性27例;年龄11~18岁,平均年龄15岁。采用数字化X射线摄影(DR)拼接技术58例脊柱侧弯患者(B组),其中男性33例,女性25例;年龄10~19岁,平均年龄16岁。Slot检查技术,通过一次连续几秒曝光获得从颈椎上段至骶尾椎的脊柱全长影像,与行DR拼接技术(通过2次摄影2张X射线照片,经过剪切、重叠拼接成全脊柱片)进行比较。结果A组患者均一次性完成全脊柱摄影检查,颈、胸、腰、骶、尾椎同时在1张X射线照片上清晰显示,整个图像密度均匀,无拼接伪影。B组患者,23例因患者移动导致重拍,16例因照片拼接误差较大导致重拍,其余19例均一次完成检查。所摄X射线照片中,患者颈、胸、腰、骶、尾椎整体影像与图像细节均显示良好,全脊柱图像可见明显的拼接伪影。B组患者中长度拼接误差14例(24.1%),角度拼接误差49例(84.5%),图像后处理放大率不同拼接误差6例(10.3%)。结论采用Slot全脊柱摄影对脊柱侧弯患者进行术前检查,与过去的DR拼接摄影法相比,不但能够清晰地显示脊柱全长影像,同时极大地提高了测量精度,保证了全幅图像密度均匀一致,对脊柱侧弯患者进行术前计划具有重要的临床意义与应用价值。 | 陈建新 付丽媛 陈自谦 刘冰川 陈坚 李超 | 2012 | 生物医学工程与临床2012，16，2： | 6 |
| 3 | 几种新型手枪射击弹壳上痕迹特征浅析显示文摘为了适应新形势下枪弹检验工作的需要,我中心枪弹处于1997、1998年分别购置了一批新型枪支.其中有13种配用9mm×19mm巴拉贝鲁姆手枪弹的新型手枪,它们分别是213型9毫米手枪、213A型9毫米手枪、七七B型9毫米手枪、七七B2型9毫米手枪、NP20型9毫米手枪、NP22型9毫米手枪、NP28型9毫米手枪、NP38型9毫米手枪、201C型9毫米手枪和NZ75型9毫米手枪.为了让更多的同行了解这13种新型手枪发射子弹的弹壳上的主要痕迹特征,我们制作了一些样本.由于每种枪仅购置了一支,故本文所介绍的有些痕迹特征究竟属于种类特征,抑或是个别特征,还有待于作进一步的实验和研究.将13种枪支划分为5组分别进行论述:一组:213型、213A型; | 姜玮 马新和 | 1999 | 刑事技术1999，24，1： | 4 |
| 4 | 青少年脊柱侧弯72例Slot全脊柱X线摄影技术的应用显示文摘青少年脊柱侧弯在全部脊柱侧弯患者中占70%~80%,可影响患者体型、外观和健康发育,轻者造成脊柱运动功能障碍,严重者造成心肺功能障碍。另外,少数可造成脊髓压迫而致下肢瘫痪及排便功能障碍,因此早发现和早治疗成为首要任务bJ。全脊柱x线摄影是对脊柱侧弯患者进行术前评估病情、测量确定方案和观察治疗效果的基础,合适的X线检查可以显示脊柱侧弯的部位、弯曲程度等。目前,国内由于X线摄影探测器长度限制,无法进行一次性脊柱摄影成像,要想得到全脊柱影像,只能将颈胸椎和腰椎分别摄影后将两张照片拼接叠加进行测量诊断,这种方法得到的影像通常会因为病人体位变化及呼吸运动而造成影像失真,从而造成测量误差,进而影响矫正效果及术后评估。Slot技术,即狭缝曝光采集技术(Slot Radiography)的出现,使得在一张图像上一次完成全脊柱摄影成为可能。本研究回顾性分析了2010年10月~2014年6月采用Slot摄影的72例拟行脊柱侧弯畸形矫正术青少年患者的全脊柱x射线影像,以探讨Slot技术在脊柱侧弯畸形矫正术中的应用价值。 | 沈永榕 陈建新 | 2015 | 功能与分子医学影像学(电子版)2015，4，1： | 4 |
| 5 | Slot Scan摄影技术在双下肢全长摄影的临床应用显示文摘目的:探讨slotscan全景摄影技术在双下肢全长摄影中的临床应用价值。方法:选取2017年6月1日—2018年6月25日行双下肢全长摄影患者135例,利用Slot检查技术,通过一次连续几秒曝光后重建获得包含双髋关节至踝关节的双下肢全长X线影像。结果:135例患者都能顺利地一次性完成双下肢全长检查,通过软件自动拼接重建处理,获得清晰、无形变的双下肢全长X片,范围包括髋关节到足尖。结论:slotscan全景摄影技术简便快捷,在下肢全长摄影中成像速度快、成像精度高、失真度小、测量数据精确可靠,具有重要的临床诊疗意义和应用推广的价值。 | 王世疆 韦芳玉 杨海坚 | 2019 | 影像研究与医学应用2019，3，4： | 4 |
| 6 | Analytical solution of electromagnetic field generated by induction logging tool in a fan-ring slot of drill collar while drilling显示文摘Based on the structural characteristic of metal drill collar for induction logging while drilling, we have given the analytical formulae of lengthways fields Ez and Hz when the tool is located in a fan-ring shaped slot of drill collar by the boundary conditions of electromagnetic field, and derived the other components of electromagnetic field in and out the fan-ring slot from Ez and Hz. In the other intervals of formation, where the drill collar is a solid cylinder, the analytical formulae of field are educed through the method of variable coefficient. The total analytical solutions of field in whole space have been obtained. With the help of the analytical formulae, we have also given numerical examples and analyzed the distributive characteristic of electromagnetic field. From the computational results we find that the secondary scattering field Hz is in a linear relation with the conductivity of stratum. The characteristic of field is very useful for induction logging while drilling, which can be used to measure and analyze the logging responses of the stratum conductivity. This paper sets up a theoretical foundation for us to study the distrbutions of field and to direct the design of logging instruments. | LIU FuPing WANG AnLing YANG ChangChun | 2009 | Science China(Technological Sciences)2009，52，7： | 4 |
| 7 | Hydraulics and swimming behavior of schizothorax prenanti in vertical slot fishways显示文摘This paper presents a novel experiment for the correlation between the hydraulics and the swimming behavior of Schizothorax prenanti,a rare species of fish in southwest China,in passing a vertical slot fishway.With an acoustic Doppler velocimeter,the velocities of a physical model in the equidimension fishway in the Shaping II power station are measured.The hydraulic parameters include the hydraulic head drop,the velocity patterns and the flow rate,and the swimming behavior includes the burst-coast,the sustained swimming and the migratory path,and they are analyzed under the test conditions.The sustained swimming velocity is in the range from 0.65m/s to 1.09m/s.The estimated hydraulic head drop of each pool is calculated and is in the range from 0.08-0.11 m,which means that 2.6% slope is reasonable.For the same slope,the maximum velocity is further reduced from 1.24 m/s to 1.14 m/s by using an L shape baffle structure.The above findings are used as the basis to evaluate the hydraulic performance of the fishways,where the L shape baffle structure is expected to be effective tor creating a preterencial flow for the fish.For the main stream of the pool,an 'Ω' shape flow pattern is more fish-friendly,which can effectively extend the energy dissipation distance and avoid the bursting through a high velocity zone.This paper provides a useful complementary tool for practical designs. | Rui-dong An Jia Li Wen-min Yi Xi Mao | 2019 | Journal of Hydrodynamics2019，31，1： | 4 |
| 8 | Low-cost high-order-mode cavity backed slot array antenna using empty substrate integrated waveguide for the 5G n260 band显示文摘1Introduction A low-cost slot array antenna is proposed for fifth-generation wireless communication(5G)n260 band applications.The antenna is based on the low-cost printed circuit board(PCB)material FR-4.Empty substrate-integrated waveguide is used to avoid high dielectric loss.High-order-mode cavities are introduced to reduce the complexity of the feeding network.The proposed antenna shows a maximum realized gain of 27 dBi with a radiation efficiency of 72.4%.The measurement and simulation results achieve good agreement.The proposed antenna can be a good candidate for low-cost millimeter-wave(mmWave)wireless communication systems. | Zihang QI Xiuping LI Hua ZHU | 2021 | Frontiers of Information Technology & Electronic Engineering2021，22，4： | 2 |
| 9 | Time-slot multiplexing based bandwidth enhancement for fiber distributed acoustic sensing显示文摘Dear editor,The phase-sensitive optical time-domain reflectometry(φ-OTDR)has been demonstrated as the most common technique in fiber distributed acoustic sensing(DAS).However,traditional φ-OTDR based DAS suffered from the inherent trade-off between the maximum frequency response and the distance which can be characterized by distance bandwidth product(DBP),since the time interval of the probe pulses should be larger than the pulse round-trip flight time. | Hao LI Cunzheng FAN Tao LIU Yujia LIU Zhijun YAN Perry SHUM Qizhen SUN | 2022 | Science China(Information Sciences)2022，65，1： | 2 |
| 10 | 岛津大平板多功能透视摄影系统技术规范及应用探讨显示文摘目的:探讨岛津大平板数字X线多功能透视摄影系统技术操作规范,评价数字化大平板X线多功能透视摄影系统的断层融合技术和全景摄影技术在普放特殊位置检查中的重要作用。颈椎寰枢关节胸骨、颞下颌关节、茎突骶尾骨等特殊位置和全脊柱摄影在常规DR摄影位置中不易清晰显示,应用大平板X线多功能透视摄影系统的断层融合和全景摄影技术能解决上述问题。 | 徐晶 夏秀杰 | 2011 | 内蒙古中医药2011，30，19： | 2 |
| 11 | Numerical Simulation of the Air Jet Flow Field in the Melt Blowing Process显示文摘The theoretical model of the flow field of the dual slot die in melt blowing process is founded. The model is solved numerically with finite difference method. The distributions of the air velocity component in x direction along x-axis and y-axis and the air temperature distributions along x-axis and y-axis are obtained via numerical computation. The computation results coincide with the experimental data given by Harpham and Shambaugh. The distributions of the air velocity and air temperature are introduced into the air drag model of melt blowing. The model prediction of the fiber diameter agrees with the experimental data well. | 陈廷 黄秀宝 | 2002 | Journal of Donghua University(English Edition)2002，19，4： | 2 |
| 12 | Flexible ultra-wideband rectangle monopole antenna with O-slot insertion design显示文摘Slot insertion design has proven to be an effective method to increase the bandwidth in the design of microstrip antenna. In this paper, the slot insertion design is applied to the flexible ultra-wideband(UWB)antenna. A flexible rectangular UWB monopole antenna is proposed and fabricated with O-slot design using the transfer printing method. By simulating the influence of O-slot design parameters on electromagnetic performance of the antenna, an optimized antenna design is obtained to keep the reflection coefficient under-10 d B with the frequencies ranging from 3.5 to 17.8 GHz when the antenna is bent with curvature radius as small as 11 mm. The effect of bending on the reflection coefficient is analyzed. Mechanical simulations indicate that the existence of O-slot can reduce the strain concentration on the metal layer of antenna, which enhances the flexibility of the antenna. | Sihong CHEN Taisong PAN Zhuocheng YAN Min GAO Yuan LIN | 2018 | Science China(Information Sciences)2018，61，6： | 1 |
| 13 | 一种改进的用于实现Observer模式的C^(++)框架显示文摘Observer模式是一种有着广泛应用的设计模式。在代码中实现他需要做大量的工作。一个好的框架可以极大地简化这个过程。但现有的几种基于C++的框架,要么使用比较复杂,要么参数的类型或个数受到限制,或者要求对语言本身进行某种扩展。所提出的框架,在完全遵循C++标准的情况下,对上述不足进行了彻底的改进,使得Observer模式在C++中的应用变得相当容易。 | 杜延宁 李志勇 | 2007 | 现代电子技术2007，30，12： | 1 |
| 14 | Numerical investigation of particle deposition on converging slot-hole film-cooled wall显示文摘Numerical research on the dilute particles movement and deposition characteristics in the vicinity of converging slot-hole(console) was carried out, and the effect of hole shape on the particle deposition characteristics was investigated. The EI-Batsh deposition model was used to predict the particle deposition characteristics. The results show that the console hole has an obvious advantage in reducing particle deposition in comparison with cylindrical hole, especially under higher blowing ratio. The coolant jet from console holes can cover the wall well. Furthermore, the rotation direction of vortices near console hole is contrary to that near cylindrical hole. For console holes, particle deposition mainly takes place in the upstream area of the holes. | 周君辉 张靖周 | 2017 | Journal of Central South University2017，24，12： | 1 |
| 15 | Enhanced optical nonlinearity in a silicon–organic hybrid slot waveguide for all-optical signal processing显示文摘Silicon photonic integrated devices used for nonlinear optical signal processing play a key role in ultrafast switching,computing,and modern optical communications.However,current devices suffer from limited operation speeds and low conversion efficiencies due to the intrinsically low nonlinear index of silicon.In this paper,we experimentally demonstrate enhanced optical nonlinearity in a silicon–organic hybrid slot waveguide consisting of an ultranarrow slot waveguide coated with a highly nonlinear organic material.The fabricated slot area is as narrow as 45 nm,which is,to the best of our knowledge,the narrowest slot width that has been experimentally reported in silicon slot waveguides.The nonlinear coefficient of the proposed device with a length of 3 mm is measured to be up to 1.43×10^(6) W^(-1)km^(-1).Based on the nanostructure design,the conversion efficiencies of degenerate four-wave mixing showed enhancements of more than 12 dB and 5 dB compared to those measured for an identical device without the organic material and a silicon strip waveguide,respectively.As a proof of concept,all-optical canonical logic units based on the prepared device with two inputs at 40 Gb/s are analyzed.The obtained logic results showed clear temporal waveforms and wide-open eye diagrams with error-free performance,illustrating that our device has great potential for use in high-speed all-optical signal processing and high-performance computing in the nodes and terminals of optical networks. | YONGHUA WANG SU HE XIAOYAN GAO PIAOPIAO YE LEI LEI WENCHAN DONG XINLIANG ZHANG PING XU | 2022 | Photonics Research2022，10，1： | 1 |
| 16 | 线性模型统计估计在智能天线同步中的应用显示文摘随着移动通信的发展,移动用户迅速增加,移动通信业务量的增长与有限的频谱资源的矛盾日益突出.解决上述矛盾的一种途径是提高频谱的有效利用率.近年来,智能天线作为提高频谱有效利用率的一种技术受到了广泛的关注.智能天线是利用各用户信号空间特征的差异,根据某个接收准则自动调节天线阵列的增益,使得在同一信道上可以接收和发送多个用户的信号而互相不干扰.但是人们必须解决由于信号通过不同的硬件和空间路径传播而在天线阵列接收和发射上引起的不同步问题.本文作者通过分析相位差的产生,从理论上证明了相位差满足线性模型,并研究了如何通过参数估计来解决这一问题. | 王丙进 朱允民 Bing-Jin Yun-Min | 2009 | 四川大学学报(自然科学版)2009，46，6： | 1 |
| 17 | 插装式流量放大阀反馈槽预开量对其性能的影响(英文)显示文摘基于流量反馈原理的Valvistor插装阀具有低泄漏、通流能力强、结构简单等优点,已被广泛应用于液压系统中,主阀反馈槽预开量对其通流能力及静态性能有显著影响。使用Simulation X建立了16通径Valvistor阀的仿真模型,通过实验验证了仿真模型的正确性,详细研究了反馈窄槽预开口量对阀芯性能的影响,结果表明:为了提高阀芯稳定性及使阀芯关闭,主阀反馈槽必须增加预开口量,但预开口量的增加会导致阀芯出现死区,同时降低了阀芯通流能力,研究结果为Valvistor阀性能的进一步提高提供了依据。 | 郭晓霞 马彦伟 张勇 黄家海 权龙 | 2015 | 机床与液压2015，43，24： | 0 |
| 18 | The effect of impeller slot jet on centrifugal pump performance显示文摘To improve the cavitation performance of the centrifugal pump, a new kind of centrifugal pump impeller with slot is proposed. The slot is on the impeller shroud near the suction side of the blade leading edge. So, the fluid with high energy in the impeller front side chamber is drained to the lowest pressure area. The jet flow would compensate the blade inlet flow with a certain energy. With numerical simulations, the pump's inner flows for 5 different slot sizes and their hydraulic performances are compared with those of the prototype pump. The slot jet would result in the increase of the impeller flow rate and the volute area ratio, leading to the head decrease within the whole flow rate range. The slot jet can suppress the reverse flow remarkably at a low flow rate, and the pump efficiency is improved. The slot jet improves the pump cavitation performance effectively, especially at a low flow rate. To some extent, the smaller the slot size is, the better the pump cavitation performance is. The cavitation performance of the slot impeller with a size of 2 mmx 1.75 mm is much better than that of the prototype impeller. Compared with the prototype impeller, the lowest pressure near the slot impeller blade inlet and even the pressure in all forepart regions are improved significantly. The slot impeller is shown to be effective in suppressing the cavitation, and the available net positive suction head is improved. | Ren-hui Zhang Li-chen Yun Jing Li | 2019 | Journal of Hydrodynamics2019，31，4： | 0 |
| 19 | 99PC新面孔——国产商用PC产品,技术选购指南显示文摘在1999年,CPU的发展呈现出一种加速前进的景象:主频更高、速度更快。 首先,龙头大哥Intel在2月率先推出了450MHz和500MHz的Pentium Ⅲ,到下半年将达到700MHz的速度。这种CPU采用了100MHz总线频率,带有“16KB指令缓存+16KB数据缓存”共32KB的L1一级缓存和512KB的二级缓存。与Pentium Ⅱ相比,除了主频更高以外,主要的一个区别就是Pentium Ⅲ内置了70条MMX2指令,Intel称之为SSE(Streaming SIMD Extensions,数据流单指令多数据扩展)指令集。该指令集主要增强了CPU的双精度浮点运算能力,对3D图形处理如三维成像、数字图像、视频编辑等具有优化和加速的作用,并可以大大提高PC在Internet应用、声音处理。 | 雅君 毛睿 | 1999 | 中国经济和信息化1999，0，15： | 0 |
| 20 | A high-isolation coupled-fed building block for metal-rimmed 5G smartphones显示文摘A dual-antenna building block with high isolation is presented for metal-rimmed fifth-generation(5G)smartphones.A coupled-fed loop antenna and a coupledfed slot antenna based on a simple T-slot etched on the ground plane are meticulously designed to form a compact building block. | Aidi REN Chengwei YU Lixia YANG Wei CUI Zhixiang HUANG Ying LIU | 2023 | Frontiers of Information Technology & Electronic Engineering2023，24，11： | 0 |
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