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| 1 | Lipid Distribution in Marine Sediments from the Northern South China Sea and Association with Gas Hydrate显示文摘The distributions of lipids in surface and subsurface sediments from the northern South China Sea were determined. The n-alkanes were in bimodal distribution that is characterized by a centre at n-C16 –n-C20 with maximum at C18(or C19) and n-C27 –n-C31 as well as at C29(or C31). The short-chain alkanes suffered from significant losses due to their slow deposition in the water column, and their presence with a slight even carbon predominance in shallow seafloor sediments was ascribed mainly to the direct input from the benthos. The long-chain alkanes with odd predominance indicate transportion of terrigenous organic matter. Immature hopanoid biomarkers reflect the intense microbial activity for bacteria–derived organic matter and the gradual increase of maturity with burial depth. Abundant n-fatty acid methyl esters(n-FAMEs) that are in distributions coincident with fatty acids were detected in all samples. We proposed that the observed FAMEs originated from the methyl esterification of fatty acids; methanol production by methanotrophs and methanogenic archaea related to the anaerobic oxidation of methane, and sulfate reduction provided an O–methyl donor for methylation of fatty acids. The CH4 released from hydrate dissociation at oxygen isotope stage II of Cores ZD3 and ZS5, which had been confirmed by the occurrence of negative δ13C excursion and spherical pyrite aggregates, could have accelerated the above process and thus maximized the relative content of FAMEs at ZD3-2(400–420 cm depth) and ZS5-2(241–291 cm depth). | OU Wenjia LEI Huaiyan LU Wanjun ZHANG Jie SHI Chunxiao GONG Chujun HAN Chao | 2014 | Acta Geologica Sinica(English Edition)2014，88，1： | 4 |
| 2 | Silicon photonic network-on-chip and enabling components显示文摘As the transistor's feature scales down and the integration density of the monolithic circuit increases continuously,the traditional metal interconnects face significant performance limitation to meet the stringent demands of high-speed,low-power and low-latency data transmission for on-and off-chip communications.Optical technology is poised to resolve these problems.Due to the complementary metal-oxide-semiconductor(CMOS) compatible process,silicon photonics is the leading candidate technology.Silicon photonic devices and networks have been improved dramatically in recent years,with a notable increase in bandwidth from the megahertz to the multi-gigahertz regime in just over half a decade.This paper reviews the recent developments in silicon photonics for optical interconnects and summarizes the work of our laboratory in this research field. | HU Ting QIU Chen YU Ping YANG LongZhi WANG WanJun JIANG XiaoQing YANG Mei ZHANG Lei YANG JianYi | 2013 | Chinese Science Bulletin2013，58，7： | 2 |
| 3 | 1178 J,527 nm near diffraction limited laser based on a complete closed-loop adaptive optics controlled off-axis multi-pass amplification laser system显示文摘A 1178 J near diffraction limited 527 nm laser is realized in a complete closed-loop adaptive optics(AO)controlled off-axis multi-pass amplification laser system.Generated from a fiber laser and amplified by the pre-amplifier and the main amplifier,a 1053 nm laser beam with the energy of 1900 J is obtained and converted into a 527 nm laser beam by a KDP crystal with 62%conversion efficiency,1178 J and beam quality of 7.93 times the diffraction limit(DL).By using a complete closed-loop AO configuration,the static and dynamic wavefront distortions of the laser system are measured and compensated.After correction,the diameter of the circle enclosing 80%energy is improved remarkably from 7.93DL to 1.29DL.The focal spot is highly concentrated and the 1178 J,527 nm near diffraction limited laser is achieved. | Deen Wang Xin Zhang Wanjun Dai Ying Yang Xuewei Deng Lin Chen Xudong Xie Dongxia Hu Feng Jing Zeping Yang Qiang Yuan Xiaofeng Wei Qihua Zhu Wanguo Zheng Xiaomin Zhang Lei Huang | 2021 | High Power Laser Science and Engineering2021，9，2： | 1 |
| 4 | Stability analysis of digitally controlled dual active bridge converters显示文摘The dual active bridge(DAB) converters are widely used in the energy storage equipment and the distributed power systems. However, the existence of switching nonlinearity and control delay can cause serious stability problem to the DAB converters. Thus, this paper,studies the stability of a digitally controlled DAB converter with an output voltage closed loop controller. Firstly, to accurately study the stability in a DAB converter, a discrete-time model established in a whole switching period is obtained. The model considers the output capacitor ESR,the digital control delay, and sample-and-hold process. By using this model, the stabilities of the DAB converter versus the proportional controller parameter and the output capacitor ESR are analyzed and the critical values are predicted accurately. Moreover, the stability boundary ofthe proportional controller parameter and the output capacitor ESR is also obtained. The result shows that the value of the output capacitor ESR can have a great effect on the stability region of the proportional controller parameter. Finally, the theoretical analyses are verified by the simulation and experimental results. | Ling SHI Wanjun LEI Zhuoqiang LI Yao CUI Jun HUANG Yue WANG | 2018 | Journal of Modern Power Systems and Clean Energy2018，6，2： | 1 |
| 5 | Seeding performance of air-assisted centralized seed-metering device for rapeseed显示文摘In order to analyze seed movement characteristics and improve seeding quality of air-assisted centralized metering device for rapeseed,the effects of the model-hole structure on seed feeding performance were investigated using EDEM simulation.Furthermore,the CFD-DEM coupling approach was applied to determine movement trajectories and airflow fields.The impacts of rapeseed varieties and rotational speed on seeding performance were investigated by bench tests.The results showed that the seed feeding quantity increased with the increase of model-hole’s length,depth and section size.Under the model-hole’s depth of 3.0 mm,the type II model-hole and model-hole’s length of 10 mm,both the variation coefficient of seed feeding quantity and hill diameter were lower which meet the seeding quantity requirement of 2 seeds in each hill.It was revealed that the seed population migrated in a large airflow velocity area and the distribution was uniform.The bench tests indicated that rapeseed varieties and rotational speed had a significant effect on the seed feeding quantity in each hill at rotational speed of 10-40 r/min.The variation coefficient of seed feeding quantity in each hill was less than 17.0%for each treatment.The hill diameter,which did not exceed 3.5 cm,tended to reduce with increasing rotational speed.The variation coefficient of seeding quantity in each row and seeding uniformity was less than 6.5%and 32.0%,respectively.Field experiments demonstrated that the seedling was 9-13 plants per meter each row for three rapeseed varieties.The variation coefficient of plants was less than 25.0%for six rows and their yields reached 2761 kg/hm2,which realized the mechanized planting requirements.The results can optimize structure of an air-assisted centralized metering system and improve seeding performance. | Xiaolong Lei Hongji Hu Wenhao Yang Liyang Liu Qingxi Liao Wanjun Ren | 2021 | International Journal of Agricultural and Biological Engineering2021，14，5： | 1 |
| 6 | Unmanned air vehicle adaptability and application evaluation for new rice panicle fertilizers:Fertilizer characteristics and mechanical adaptability显示文摘High-efficiency fertilizers suitable for mechanical spraying can improve the fertilizer application and utilization efficiency.In this study,two types of granular compound fertilizers suitable for unmanned air vehicle spraying were developed using urea,potassium chloride,humic acid,and an amino acid synergist according to the fertilization requirements of rice at the booting stage.The physical and chemical properties of the compound fertilizers were analyzed by Fourier transform infrared spectroscopy and scanning electron microscopy.The release kinetics of the fertilizer was studied via a soil column leaching experiment.The effect of fertilizer particles on unmanned air vehicle spraying uniformity was studied via an orthogonal simulation experiment.Results showed that the chemical interaction between compound-fertilizer raw materials formed complexes such as C-NH-C and-CO-NH-,which caused a change in fertilizer particle morphology.This led to chemical monolayer adsorption or internal fertilizer diffusion,which in turn delayed the fertilizer release by 5−10 d.A simulation bench test showed that the fertilizer particle hardness and roundness exceeded 20 N and 85%,respectively,while the particle size was in the range of 2.07−5.13 mm,which resulted in good unmanned air vehicle spraying uniformity with a lateral variation coefficient of less than 15%.Finally,the experimental field results demonstrated that the new compound fertilizers,when sprayed by an unmanned air vehicle,could improve the economic benefit by 916−2742 CNY ha−1 without reducing the nitrogen utilization rate and rice yield.The new compound fertilizers exhibit delayed release,good spraying uniformity,and improved economic benefit,rendering them suitable for large-scale promotion and application. | Shilin Zhu Wei Zhou Li Zhu Boteng Sun Song Huang Zhenyuan Wu Qin Qin Tao Wang Yong Chen Fei Deng Xiaolong Lei Youfeng Tao Hong Cheng Wanjun Ren | 2022 | Technology in Agronomy2022，2，1： | 0 |
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