To enhance the absolute position accuracy and solve complex modeling computational complexity problems in traditional compensation methods for aviation drilling robots, a method based on extreme learning machine model was proposed this article. The method, which influence of geometric factors non-geometric robot is considered, builds positional error prediction machine. As input output training data, theoretical errors measured by high-precision laser tracker were used to train construct...

Abstract Two sediment cores recovered from Dahu Swamp, which is located in eastern Nanling Mountains south China, were selected for investigation of palaeoclimatic changes. Multi‐proxy records the two including lithological variation, organic carbon isotope ratio, dry bulk density, matter content, magnetic susceptibility, humification degree, median grain size and geochemical proxies reveal that during last deglaciation three drier phases correspond to Oldest, Older Younger Dryas cooling...

The position accuracy of an aviation drilling robot has detrimental effects on the assembly quality, mechanical strength and life aircraft in manufacturing. To enhance robot, a compensation method based error similarity correlation is proposed. Firstly, positional joint space kinematic model are presented to illustrate that co-kriging can be used estimate robot. Then, cross-variogram errors introduced. Co-kriging applied estimated along x, y, z axes absolute error. values filtered by using...

To enhance the perpendicularity accuracy in robotic drilling system, a normal sensor calibration method is proposed to identify errors of zero point and laser beam direction displacement sensors simultaneously. The procedure adjustment system introduced firstly. Next measurement model on datum plane constructed based principle distance for sensors. An extended Kalman filter algorithm used errors. Then surface attitude adjustments are presented ensure that axis drill bit coincides with at...

Zhong, W., Ma, Q. H., Xue, J. B., Zheng, Y. M., Cai, & Ou, 2009: Humification degrees of a lacustrine sedimentary sequence as an indicator past climatic changes in the last c . 49 000 years South China. Boreas , 10.1111/j.1502‐3885.2009.00119.x. ISSN 0300‐9483. An 860 cm long sediment core recovered from Dahu Swamp was used to test potential degree humification (expressed corrected absorbance values, HD cab ) sediments The chronological this established using 10 AMS 14 C dates and...

Purpose To improve the accuracy of industrial robots’ absolute positioning, a Kriging calibration is proposed. Design/methodology/approach This method particularly designs semivariogram for connecting joint space and working space. After that, equations are determined solved to predict position errors targets. Subsequently, simple convenient error compensation, which can be implemented on control command, Findings The verification experiment position-error multiplicity done in KUKA R210...

A plastic, 95-GHz rectangular waveguide with an integrated plastic flange has been successfully demonstrated using micro hot embossing and electroplating technologies. The prototype device shows s/sub 11/ 21/ values of -20.7 dB -1.35 at 95GHz, respectively, the signal transmission rate is 73.3% as compared to commercial all-metal waveguides 85%. time domain measurement showed system losses are mainly due discontinuity interfaces between network analyzer adaptors input/output ports could be...

A micromachined W-band iris filter was successfully demonstrated using micro hot embossing and selective electroplating technologies. The design follows the insertion loss method with a Chebyshev polynomial to synthesize desired spectral responses numerical simulations were performed finite-element tool, high frequency structure simulator (HFSS), study effects of thickness on bandwidth center frequency. measured prototype performance has transmission -3.49 dB return -18 at resonant 95 GHz....

Here is presented an optimized RF-LDMOS (Radio Frequency Lateral Double Diffused MOS) structure with double grounded G-shield and multiple drift region implants which significantly improved HCI high RF performance especially for frequency application. The experimental data shown both excellent have been achieved. Measured full load test, we gained 1.42 W/mm 1.36 output power density 68.76% 65.97% drain efficiency in 2110MHz 2600MHz respectively. And the I <sub...

A 350-cm-long sediment core sequence from Dahu Swamp situated in the eastern Nanling Mountains was selected for high-resolution paleoclimatic reconstruction since Late Glacial period. The multi-proxy records of this paper reveal several evidently dry and cold events that may coincide with Oldest Dryas, Older Younger Dryas late deglacial Two relatively wetter warmer phases occurred ca. 15,000–14,400 cal yr B.P. 13,500–12,800 respectively correspond to Bølling Allerød warming events. event...

腐殖质具有对气候环境变化响应敏感的特点,已经展示出了作为古气候演变研究载体的重要潜力和优势.当前,腐殖化度对气候环境变化指示意义的研究主要应用于泥炭沉积上,而对于湖泊沉积物中腐殖化度气候环境变化的研究,至今尚未见到报道.根据新疆东疆北部巴里坤湖湖泊沉积物腐殖化度的分析,同时结合年代学、有机质含量、总有机碳、自生碳酸盐δ¹³C,δ¹⁸O的分析结果,认为该湖泊沉积物中腐殖化度可以较为敏感地反映气候环境变化的相关消息.较高的腐殖化度,指示气候相对湿润,而较低的腐殖化度值,指示气候相对干燥.在此基础上,结合多指标变化,初步划分了巴里坤湖地区近9.4cal kaBP以来经历了干(9.4-7.5cal kaBP)-湿(7.5-5.8cal kaBP)-干(5.8-3.0 cal kaBP)-湿(3.0-1.0cal kaBP)-干(1.0-0cal kaBP)五个阶段.;The humification of peat deposits has been reported as a useful proxy to indicate...

The environmental change on earth is a hot issue for discussions in many fields and it results from energy conversion of various natural factors. In order to investigate the urban heat island (UHI) phenomenon summer Wuhan (Hubei Province, P.R. China), very representative city which cold winter, causes UHI, we conducted moving observations an area with same predominant wind direction collected lot data. After data handling analysis, series graphs tables were obtained reflect real UHI effect...

This paper discussed modeling, design, fabrication and characterization of a new cantilever-type electrostatic zipping actuator. The actuator was designed to achieve high displacements fabricated using multi-layer polysilicon foundry process PolyMUMPS. out-of-plane displacement is satisfy the requirements in specific optical applications. In this we presented design considerations displacement, forces stability. force between curved cantilever bottom electrode on substrate pulls down. With...

The advantages of polymers have made them popular choices in many micro device applications. benefits low material and fabrication costs been demonstrated micro-fluidic devices. conductivities dielectric constants provide potentials for high quality-factor RF MEMS Nevertheless, the extension using electronic components has not well explored. In this work, we investigated processes performances coplanar waveguide (CPW) transmission lines, with which phase shifters, tuners, switches...

In order to remove the image noise more effectively，an denoising algorithm based on Nonsubsampled Contourlet Transform (NSCT) and bilateral filtering in spatial domain is proposed.The noisy first decomposed into multi-scale multi-directional subbands by NSCT, direction of each high-pass component processed new threshold function which obtained Bayes that stratified estimation..During reconstruction, low-pass subband constructed further denoisied domain.Experimental results demonstrate...