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| 1 | Influences of wide-narrow seeding on soil properties and winter wheat yields under conservation tillage in North China Plain显示文摘In order to promote the winter wheat yield and guarantee seeding quality in double-cropping system,no-tillage or reduced tillage planting modes with different row spacing have been implemented to result in different levels of yield.A three-year(2012-2015)field experiment was conducted on the experimental farm at Zhuozhou of Hebei Province in North China Plain to compare winter wheat yield from the two planting modes:wide-narrow row space planting mode(WN)and uniform row space planting mode(UR)Both planting modes were performed under reduced tillage conditions with straw mulching.The results showed that in North China Plain WN had positive impacts on crop yield,yield components,leaf area index(LAI)and intercepted photosynthetically active radiation(IPAR)index.Comparing with the UR,IPAR and LAI index for WN were enhanced by 4.8%and 5.2%,respectively.The average yield for WN was 7.2%,significantly greater than that of UR under the same quantity and density.In addition,for WN mode,machinery could pass through with less blocking under large amount of straw mulching,which largely improved tillage efficiency and potentially popularized the conservation tillage technology in North China plain.It is therefore recommended that wide-narrow row space planting mode(WN)combined with reduced tillage and straw mulching be more suitable for conservation tillage in double-cropping pattern areas in North China Plain. | Hongnan Hu Caiyun Lu Qingjie Wang Hongwen Li Jin He Dijuan Xu Xianliang Wang | 2018 | International Journal of Agricultural and Biological Engineering2018，11，4： | 4 |
| 2 | Design and experiment of anti-vibrating and anti-wrapping rotary components for subsoiler cum rotary tiller显示文摘The commonly used subsoiling cum rotary tiller machine(SRT)in Northern China is a combination of subsoiler and horizontal rotary tiller,however backfilling of the subsoiling slot,excessive vibration and plant residue wrapping on rotary components has been rarely considered.Therefore,the rotary components and assembly were redesigned to address these issues and to an SRT fitted with IT225 short curve rotary blades behind the V-shape subsoiling slots and IIT245 long curve rotary blades between the tines.Long and short blades were fitted on a rotor in a double helix,with optimal spiral angles of 65° and 90°,and phase angle of 147°and 180°,respectively.Compared with the commonly used SRT(CSRT),the additional anti-wrapping cutting blades in the circumferential and axial direction of ASRT could remove hanging residue on the blade holders,wrapping on the rotor and formation of an isolation layer.Moreover,the cutting edge curve of anti-wrapping cutting blades was an exponential curve.Field tests demonstrated that the redesigned SRT with anti-vibrating and anti-wrapping rotary components(ASRT)had was a significant advancement over the CSRT.Moreover,the working depth of rotary tillage was more stable,while other observations confirmed that backfilling of the subsoiling slot was also improved. | Kan Zheng Allen D.McHugh Hongwen Li Qingjie Wang Caiyun Lu Hongnan Hu Wenzheng Liu Zhiqiang Zhang Peng Liu Jin He | 2019 | International Journal of Agricultural and Biological Engineering2019，12，4： | 4 |
| 3 | Performance of waterjet on cutting maize stalks: A preliminary investigation显示文摘Large amounts of crop stalks left in the field as a result of conservation agriculture cause blockage during no-till planting.To solve this issue,pure waterjet was used to cut off the maize stalks so that the rear furrow opener could pass through without blockage.In this investigation,an experimental study on depth of cut,which was the main performance indicator of pure waterjet on cutting maize stalks,was presented.A full factorial design with 200 tests was implemented with respect to three operation parameters,that is traverse speed,waterjet pressure,and standoff distance were considered as variables.An analysis of variance(ANOVA)was carried out in order to determine the statistical significance of individual operation parameters.Using multilinear stepwise regression analysis,a model to predict the cut of depth from the predicted pure waterjet operation to cut maize stalks was then developed.All three operation parameters significantly influenced the cutting performance.Moreover,the results indicated that depth of cut increased with the increase of waterjet pressure,the decrease of traverse speed,and decrease in standoff distance.Waterjet pressure provided major contribution to depth of cut,followed by traverse speed,then standoff distance,which was demonstrated by both ANOVA and regression analysis.The experimental results showed that when the standoff distance was closer than 10 mm and waterjet pressure was 280 MPa,all maize stalks specimen could be cutoff thoroughly.With the consideration of field operating conditions,waterjet pressure of 280 MPa or higher and 10 mm to 15 mm standoff distance were recommended for maize stalks cutting.This analysis provided a realistic approach for the optimization of the ultra-high pressure pure waterjet parameters in maize stalks cutting,which could be used to relieve the occurrence of straw blockage in no-till planting. | Hongnan Hu Hongwen Li Qingjie Wang Jin He Caiyun Lu Yingbo Wang Chunlei Wang | 2019 | International Journal of Agricultural and Biological Engineering2019，12，5： | 1 |
| 4 | Anti-blocking performance of ultrahigh-pressure waterjet assisted furrow opener for no-till seeder显示文摘No-till planting method is widely used for maize-wheat two-crops-a-year area in the North China Plain.However,cruel soil conditions,especially the large number of maize stalks which are hard to cutoff covering,often cause an unsatisfying planting quality.Based on the authors’previous investigation,ultrahigh-pressure(UHP)waterjet is capable to solve this problem and obtain qualified seedbeds.Thus,a UHP waterjet assisted furrow opener for no-till seeder was designed.Field tests showed that double-disc furrow openers worked well with UHP waterjet,since the sharpened disc blades could help to cut soil and residue,meanwhile,minimize soil disturbance.Response surface method(RSM)was used to investigate the relationship among forward speed,waterjet pressure,jet impingement angle and anti-blocking performance(stalks cutoff ratio and depth of soil cutting),and a Box-Behnken three-factor design was used to identify the optional operation parameters.A total of 17 combinations were conducted,and the results showed all three operation parameters significantly affected anti-blocking performance.Stalks cutoff ratio and depth of soil cutting increased with the increase of waterjet pressure,jet impingement angle,and decreased with the increase of forward speed.The optimization analysis indicated that when waterjet pressure was 267-280 MPa,jet impingement angle was 80.2°to 90.0°and forward speed was 4.00-4.42 km/h,the overall performance of UHP waterjet assisted double-disc furrow opener for no-till seeder was maximized.Stalks cutoff ratio could be above 95%and no blockage occurred.This study may provide a new approach and reference for the anti-blocking technology of no-tillage seeding. | Hongnan Hu Hongwen Li Qingjie Wang Jin He Caiyun Lu Yingbo Wang Peng Liu | 2020 | International Journal of Agricultural and Biological Engineering2020，13，2： | 1 |
| 5 | Research progress of rubrene as an excellent multifunctional organic semiconductor显示文摘Rubrene,a superstar in organic semiconductors,has acliieved imprecedented achievements in the application of electronic devices,and research based on its various photoelectric properties is still in progress.In this review,we introduced the preparation of rubrene crystal,summarized the applications in organic optoelectronic devices with the latest research achievements based on rubrene semiconductors.An outlook of future research directions and cliallenges of rubrene semiconductor for applications is also provided. | Si Liu Hongnan Wu Xiaotao Zhang Wenping Hu | 2021 | Frontiers of physics2021，16，1： | 0 |
| 6 | Deep insight into the charge transfer interactions in 1,2,4,5-tetracyanobenzene-phenazine cocrystal显示文摘A new charge transfer cocrystal of 1,2,4,5-tetracyanobenzene(TCNB)-phenazine(PTC)was prepared by solvent evaporation method.The donor and acceptor molecules of cocrystal are stacked face to face with a mixed-stacking,implying a strong charge transfer(CT)interactions in the cocrystal system.The spectroscopic studies,single-crystal X-ray diffraction structure,density functional theory(DFT)and Hirschfield surfaces calculations are carried out to explore the relationship between structure and properties of cocrystal system,which show that the intermolecular interactions in PTC are stronger than those of single components,leading to the stability and photophysical behaviors of cocrystal different from their constitute units.This study will be helpful for the design and preparation of multifunctional cocrystal materials. | Hongnan Wu Yajing Sun Lingjie Sun Liwei Wang Xiaotao Zhang Wenping Hu | 2021 | Chinese Chemical Letters2021，32，10： | 0 |
| 7 | THE BROAD-BAND CCD PHOTOMETRY AND DUST PRODUCTION RATES OF COMET HALE-BOPP显示文摘Based upon broad-band CCD observation data of comet Hale-Bopp obtained by a 60cm telescope at Xinglong Station of Beijing Astronomical Observatory during March-August, 1996, the photometric results of comet Hale-Bopp are reported. Using the photometric results, the dust production rate, radius and mass of nucleus of comet Hale-Bopp are estimated as follows: dM/dt~1.5×10 5 kgs -1, R n~35.5km, and M n~5.65×10 16kg. | Huang Keliang 1 Hu Jingyao 2 Zhou Hongnan 1 (1. Department of Physics, Nanjing Normal University, Nanjing 210097) (2. Beijing Observatory, Chinese Academy of Sciences, Beijing 100080) | 2000 | 中国科学院上海天文台年刊2000，，S1： | 0 |
| 8 | Silicon photonics for high-capacity data communications显示文摘In recent years,optical modulators,photodetectors,(de)multiplexers,and heterogeneously integrated lasers based on silicon optical platforms have been verified.The performance of some devices even surpasses the traditional III-V and photonic integrated circuit(PIC)platforms,laying the foundation for large-scale photonic integration.Silicon photonic technology can overcome the limitations of traditional transceiver technology in high-speed transmission networks to support faster interconnection between data centers.In this article,we will review recent progress for silicon PICs.The first part gives an overview of recent achievements in silicon PICs.The second part introduces the silicon photonic building blocks,including low-loss waveguides,passive devices,modulators,photodetectors,heterogeneously integrated lasers,and so on.In the third part,the recent progress on high-capacity silicon photonic transceivers is discussed.In the fourth part,we give a review of high-capacity silicon photonic networks on chip. | YAOCHENG SHI YONG ZHANG YATING WAN YU YU YUGUANG ZHANG XIAO HU XI XIAO HONGNAN XU LONG ZHANG BINGCHENG PAN | 2022 | Photonics Research2022，10，9： | 0 |
| 9 | Million-Q integrated Fabry-Perot cavity using ultralow-loss multimode retroreflectors显示文摘The monolithic integration of Fabry-Perot cavities has many applications,such as label-free sensing,high-finesse filters,semiconductor lasers,and frequency comb generation.However,the excess loss of integrated reflectors makes it challenging to realize integrated Fabry-Perot cavities working in the ultrahigh-Q regime(>10^(6)).Here,we propose and experimentally demonstrate what we believe is the first silicon integrated million-Q Fabry-Perot cavity.Inspired by free-space optics,a novel monolithically integrated retroreflector is utilized to obtain near-unity reflectance and negligible reflection losses.The corner scattering in the retroreflector is prevented by the use of the TE_(1) mode,taking advantage of its zero central field intensity.Losses incurred by other mechanisms are also meticulously engineered.The measurement results show resonances with an ultrahigh intrinsic Q factor of≈3.4×10^(6)spanning an 80-nm bandwidth.The measured loaded Q factor is≈2.1×10^(6).Ultralow reflection losses(≈0.05 dB)and propagation losses(≈0.18 dB/cm)are experimentally realized. | HONGNAN XU YUE QIN GAOLEI HU HON KI TSANG | 2022 | Photonics Research2022，10，11： | 0 |
| 10 | Breaking the resolution-bandwidth limit of chip-scale spectrometry by harnessing a dispersion-engineered photonic molecule显示文摘The chip-scale integration of optical spectrometers may offer new opportunities for in situ bio-chemical analysis,remote sensing,and intelligent health care.The miniaturization of integrated spectrometers faces the challenge of an inherent trade-off between spectral resolutions and working bandwidths.Typically,a high resolution requires long optical paths,which in turn reduces the free-spectral range(FSR).In this paper,we propose and demonstrate a ground-breaking spectrometer design beyond the resolution-bandwidth limit.We tailor the dispersion of mode splitting in a photonic molecule to identify the spectral information at different FSRs.When tuning over a single FSR,each wavelength channel is encoded with a unique scanning trace,which enables the decorrelation over the whole bandwidth spanning multiple FSRs.Fourier analysis reveals that each left singular vector of the transmission matrix is mapped to a unique frequency component of the recorded output signal with a high sideband suppression ratio.Thus,unknown input spectra can be retrieved by solving a linear inverse problem with iterative optimizations.Experimental results demonstrate that this approach can resolve any arbitrary spectra with discrete,continuous,or hybrid features.An ultrahigh resolution of<40 pm is achieved throughout an ultrabroad bandwidth of>100 nm far exceeding the narrow FSR.An ultralarge wavelength-channel capacity of 2501 is supported by a single spatial channel within an ultrasmall footprint(≈60×60μm^(2)),which represents,to the best of our knowledge,the highest channel-to-footprint ratio(≈0.69μm^(−2))and spectral-to-spatial ratio(>2501)ever demonstrated to date. | Hongnan Xu Yue Qin Gaolei Hu Hon Ki Tsang | 2023 | Light(Science & Applications)2023，12，3： | 0 |
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