A5003261877- Gyrotron and Vacuum Electronics Research
- Crop Yield and Soil Fertility
- Microwave Engineering and Waveguides
- Particle accelerators and beam dynamics
- Genetics and Plant Breeding
- Optical Systems and Laser Technology
- Ammonia Synthesis and Nitrogen Reduction
- Pulsed Power Technology Applications
- Radio Frequency Integrated Circuit Design
- Acoustic Wave Resonator Technologies
- Superconducting and THz Device Technology
- Rice Cultivation and Yield Improvement
- Wheat and Barley Genetics and Pathology
- Advanced Power Amplifier Design
- Adaptive optics and wavefront sensing
- Insects and Parasite Interactions
- Radio Wave Propagation Studies
- Bioenergy crop production and management
- Advanced DC-DC Converters
- Nanopore and Nanochannel Transport Studies
- Plant Physiology and Cultivation Studies
- Agricultural Engineering and Mechanization
- Antenna Design and Analysis
- Context-Aware Activity Recognition Systems
- Postharvest Quality and Shelf Life Management
Beijing Vaccum Electronic Research Institute
2007-2024
Zhejiang Ocean University
2024
Institute of Optics and Electronics, Chinese Academy of Sciences
2014-2023
Chinese Academy of Sciences
2014-2023
University of Chinese Academy of Sciences
2023
Ministry of Agriculture and Rural Affairs
2023
Jilin Academy of Agricultural Sciences
2013-2023
Jilin Agricultural University
2021-2023
Hainan University
2023
Robotic Technology (United States)
2022
Integrating deformable mirrors within the optical train of an adaptive telescope was one major innovations in astronomical observation technology, distinguished by its high throughput, reduced surfaces, and incorporation mirror. Typically, voice-coil actuators are used, which require additional position sensors, internal control electronics, cooling systems, leading to a very complex structure. Piezoelectric secondary mirror technologies were proposed overcome these problems. Recently,...
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The appropriate increase of planting densities is the key to obtainment high-yield maize (Zea mays L.). However, lodging a major constraint limit grain yield under increased density in present production. Effects population on stalk and agronomic traits were investigated using two cultivars Denghai 618 (DH618, low with spike height) Xianyu335 (XY335, high height). Four levels treatment imposed by 1.5, 6.0, 7.5, 9.0 × 104 plants ha−1. Results showed that bending strength, rind penetration...
摘要: 选用玉米品种登海661和农大108,设置不同种植密度,研究高产条件下种植密度对夏玉米产量及干物质积累与分配的影响。结果表明,种植密度增加后群体产量和干物质积累量显著增加,单株产量和干物质积累量反之。登海661在9万株 hm-2时充分发挥了生长潜能,可获高产。随种植密度的增加,开花期和乳熟期茎秆干物质积累量的降幅大于叶片,主要影响茎秆干物质积累;成熟期茎秆干物质积累量降幅小于叶片,主要影响叶片干物质积累。乳熟期以后茎秆和叶片的干物质输出率均随种植密度增加显著减少,茎秆的贡献率随种植密度增加显著减少,而叶片的贡献率,随种植密度增加显著增加。密度3~9万株 hm-2时茎秆对籽粒干物质积累量贡献率大,10.5~13.5万株 hm-2时叶片对籽粒库建成影响大。
The cold cathode magnetron is one of the most significant research areas in development magnetrons. Unlike thermionic magnetron, such a device capable to start up instantaneously, while featuring an excellent stability and reliability as compared with one. In this paper, we report on start-up performance four types magnetrons, i.e., barium-tungsten (Ba-W), Ba-W priming, Pd-Ba alloy, diamond coated cathodes. Based measured data, (3.5% weight) alloy was found be best for magnetron. This able...
This article presents a design method for multistage depressed collectors (MDCs) in W-band traveling -wave tubes (TWTs) using microwave tube simulation studio (MTSS) code. First, the conditions of spent electron beam, including position and velocity distributions, were simulated. Then, to verify feasibility effectiveness simulation, output power, electronic efficiency, collector efficiency overall existing 250-W pulsed TWT with single-stage also simulated making use above-spent beam at...
Spatial harmonic magnetrons (SHMs) are effective microwave oscillation sources in short millimeter and terahertz regions. This paper presents the development of a miniaturized W-band SHM, which features small size, lightweight, high power, reliability. In design this first backward spatial wave π/2 -1 mode was used for beam-wave interaction. Then particle-in-cell code employed to analyze its characteristics, including dispersion, separation, field distribution, electron spokes. Based on...
The increase of planting density is a dominant approach for the higher yield maize. However, stalks some varieties are prone to lodging under high conditions. Much research has been done on evaluation maize resistance. But there few comprehensive reports determination resistance in situ without injury field This study introduces non-destructive tester determine different field. force value can be obtained by pulling stalk angles with this instrument, which used evaluate varieties. From 2018...
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摘要: 以矮秆玉米品种登海661 (DH661),中间型玉米品种超试3号(CS3),高秆玉米品种鲁单981 (LD981)和先玉335 (XY335)为试验材料,研究不同株高夏玉米品种同化物积累、转运及分配特性。结果表明,不同株高类型玉米品种干物质积累量在开花期之前差异不显著,其差异主要表现在开花后,随株高的增加,开花后的干物质积累降低。矮秆品种植株中下部茎秆的碳素分配率比高秆品种低,叶片则相反。通过13C同位素示踪研究表明,不同株高类型玉米品种不同部位叶片对产量的贡献不同。随株高降低,中、下部叶片的光合产物转移率相对提高,而上部叶片的转移率有所下降,高秆品种LD981和XY335上部叶片对籽粒的贡献率相对较高,中矮秆品种DH661和CS3下部叶片对籽粒的贡献率相对较高。不同部位叶片在开花前后对籽粒贡献也不相同,高秆品种LD981和XY335上部叶片开花后光合产物的转移率最高;矮秆品种DH661中部叶片开花前光合产物的转移率最高。
Attempts are made to eliminate the effects of non-uniform illumination on precision wave-front measurement. To achieve this, relationship between slope at a single sub-aperture and distributions phase light intensity were first analyzed obtain relevant theoretical formulae. Then, based principle modal reconstruction, influence distribution is introduced into calculation reconstruction matrix. Experiments conducted prove that corrected algorithm improved accuracy reconstruction. Moreover,...
山东泰安 271018; 2 山东登海种业股份有限公司 / 山东省玉米育种与栽培技术 重点实验室, 山东莱州 261448; 3 吉林省农业科学院环资中心, 吉林长春 130033 摘 要: 探明不同株高、穗位高具有超高产潜力(>15 000 kg hm 2 )夏玉米品种的物质生产及光合特性, 有利于密植增 产。本研究在多年高产试验基础上(连续 年达 15
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This article investigates a planar distributed four-beam electron optics system for the folded waveguide traveling wave tube (TWT) operating in W-band. The integrated periodic permanent magnetic (PIPPM) focusing is constructed to achieve multibeam array with adjacent beam separation of 20 mm by 1-D compression, where axial <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${B}_{\text {z}}$...
This letter presents the design and experimental study of a <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$W$ </tex-math></inline-formula> -band traveling wave tube (TWT) with an overall efficiency over 40% using multistage depressed collectors (MDCs). The folded waveguide (FWG) high coupling impedance phase velocity tapering (PVT) circuit has been used to achieve electronic 10%. Furthermore, three-stage...
Lodging reduce sugarcane yield, also results in the increase of harvest loss and head-splitting rate mechanical harvesting.Although there are some researches on lodging resistance sugarcane, few studies effects root-soil multi-factor, which limits discovery most important influence factors effective technical measure sugarcane.This study aimed at: (1) establishing mathematical model relationship between F30° root soil parameters using artificially induced tilt experiment for sugarcane.F30°...