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Continuous size-based sorting of microparticles using reconfigurable scanning-optical-trap arrays 认领 引用
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作者 Zeran Li Xiaoxia Chen +6 位作者 Yanan Zhang Xi Zhang Yuchao Li Tianli Wu Xiaohao Xu Baoli Yao Yao Zhang 《Advanced Photonics Nexus》 CSCD 2026年第5期201-210,共10页
The continuous,high-precision sorting of microparticles by size is crucial for biomedical and materials science,yet achieving label-free operation,dynamic reconfigurability,and high throughput simultaneously remains c... The continuous,high-precision sorting of microparticles by size is crucial for biomedical and materials science,yet achieving label-free operation,dynamic reconfigurability,and high throughput simultaneously remains challenging.Here,we demonstrate continuous,size-based sorting using reconfigurable scanning-optical-trap(SOT)arrays.The method employs a dynamic optical potential landscape of orthogonally arranged guiding and sorting tracks,created via high-speed laser scanning.Sorting is governed by a tunable“sorting gap”at track junctions,in which size-dependent optical forces deterministically route a particle onto a sorting track only if its diameter exceeds a gap-specific critical value.Simulations establish a predictive one-to-one particle-size-to-optimal-gap relationship.Experimentally,the system achieves a sorting resolution of 90%,an average accuracy>90%(peak 98%at 1000 Hz)within a 900 to 1100 Hz frequency window,and successfully performs the simultaneous,continuous sorting of a fourcomponent polydisperse mixture.This reconfigurable,flow-free,and label-free method bridges precise optical manipulation with higher-throughput sorting,offering a versatile platform for analyzing complex colloidal and biological samples. 展开更多
关键词 optical tweezers microparticle sorting acousto-optic deflector reconfigurable optical traps size-based separation
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Study on Ecological Carrying Capacity of Land in Henan Province 认领 引用
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作者 Yanhua SONG Lei WANG Xihui YANG 《Meteorological and Environmental Research》 2022年第4期40-47,50,共8页
In order to explore the technical methods to improve the ecological carrying capacity of regional land under the premise of limited land use area,an open ecological footprint model is established based on the traditio... In order to explore the technical methods to improve the ecological carrying capacity of regional land under the premise of limited land use area,an open ecological footprint model is established based on the traditional ecological footprint model.Using the two models,this paper evaluates the ecological carrying capacity of Henan Province in 2017.The results indicate that the ecological productive footprint of cultivated land in Henan Province is much larger than the ecological carrying capacity,but the ecological consumption footprint is lower than the ecological carrying capacity.The open ecological footprint model can clearly distinguish the internal and the external ecological consumption footprint after corrected by the consumption adjustment coefficient and the land-use structure adjustment coefficient.Based on the open ecological footprint model,the ecological carrying capacity evaluation results of Henan Province are more realistic.The comprehensive ecological carrying capacity in Henan Province has a surplus,but there are significant differences among different land use types.The cultivated land has the largest ecological carrying capacity surplus,while the fossil energy land has a larger ecological carrying capacity deficit.In the process of achieving sustainable development,Henan Province should focus on reducing energy consumption and improving the ecological carrying capacity of fossil energy land.The paper concludes that the open ecological footprint model can simulate the ecological carrying capacity under different land use structures and different consumption structures.According to the simulation results,the technical methods to improve the ecological carrying capacity under the premise of limited land use scale can be proposed.The research can provide reference for land use structure adjustment,land use planning and land protection in Henan Province.It can also provide scientific basis for ecological protection and high-quality development of the Yellow River basin. 展开更多
关键词 Ecological footprint Ecological carrying capacity Open model Consumption adjustment coefficient Land-use structure adjustment coefficient
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Pixel-level landslide stability mapping based on three-dimensional time-series InSAR monitoring and dynamics factors extraction 认领 引用
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作者 Jichao Lv Rui Zhang +4 位作者 Oriol Monserrat Wenfei Mao Xin Bao Renzhe Wu Guoxiang Liu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第7期5194-5217,共24页
Conventional methods for evaluating landslide stability based on physical-mechanical properties and deformation often fail to accurately capture engineering geological conditions and spatiotemporal kinematic evolution... Conventional methods for evaluating landslide stability based on physical-mechanical properties and deformation often fail to accurately capture engineering geological conditions and spatiotemporal kinematic evolution across entire slopes.In this study,we propose a pixel-level landslide stability mapping method that uses three-dimensional time-series interferometric synthetic aperture radar(InSAR)monitoring and dynamic factor extraction.The method was applied to two reactivated landslides,Xiongba and Sela,in Gongjue County,Xizang.Using 212 Sentinel-1 ascending and descending orbit images(acquired between 2017 and 2021),we derived line-of-sight(LOS)deformation velocities using the Small Baseline Subset(SBAS)InSAR technique.Subsequently,these velocities were decomposed into full three-dimensional displacements based on a surface-parallel flow assumption and Helmert variance component estimation.A dual-parameter stability criterion combining the displacement vector angle and rate was established and compared with the traditional tangential angle method by integrating kinematics with elastoplastic principles.The results show that the new criterion effectively reduces sensitivity to deformation fluctuationsand reveals dominant elastic deformation in both landslides,controlled by Poisson’s ratio and stress proportionality.The Xiongba source area,platform,and front edges correspond to the plastic,initial,and elastic stages,respectively,while the Sela landslide exhibits elastic,plastic,and sliding stages,both of which contain secondary deformation zones.Meteorological data analysis identifiedthe Jinsha River’s scouring erosion and seasonal heavy rainfall as the primary external factors triggering landslide reactivation.Additionally,the 2018 Baige landslide-dam burst disaster chain further worsened the Xiongba landslide deformation.These findingsoffer valuable insights for future disaster prevention efforts. 展开更多
关键词 Landslide stability Interferometric synthetic aperture radar(InSAR) Displacement vector angle Xiongba landslide Sela landslide
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Superadiabatic Multiphoton Landau-Zener-Stückelberg-Majorana Effect in a Transmon Qudit 认领 引用
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作者 Pei-Yao Song Jin-Lei Wu Shi-Lei Su 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第4期105-110,共6页
The recently observed two-photon Landau-Zener-Stückelberg-Majorana(LZSM)effect in superconducting circuits[Phys.Rev.Lett.134060602(2025)]has provided a robust pathway for high-fidelity population transfer in qudi... The recently observed two-photon Landau-Zener-Stückelberg-Majorana(LZSM)effect in superconducting circuits[Phys.Rev.Lett.134060602(2025)]has provided a robust pathway for high-fidelity population transfer in qudit systems,but its adiabatic nature necessitates long operation times,which are vulnerable to decoherence. 展开更多
关键词 superconducting circuits physrevlett multiphoton decoherence population transfer transmon qudit superadiabatic qudit systemsbut landau zener st ckelberg majorana
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Fabrication and gas sensing property of honeycomb-like ZnO 认领 引用 被引量：9
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作者 Chao Li Zhi Shuo Yu +4 位作者 Shao Ming Fang Huan Xin Wang Yang Hai Gui Jia Qiang Xu Rong Feng Chen 《Chinese Chemical Letters》 SCIE CAS 2008年第5期599-603,共5页
We report the structural characterization and proposed formation mechanism of honeycomb-like ZnO conglomerations fabricated by direct precipitation method. X-ray diffraction （XRD）, energy-disperse X-ray spectrometry... We report the structural characterization and proposed formation mechanism of honeycomb-like ZnO conglomerations fabricated by direct precipitation method. X-ray diffraction （XRD）, energy-disperse X-ray spectrometry （EDS）, scanning electron microscopy （SEM） showed that the as-prepared ZnO calcined at 700 ℃ were micron sphere particles with honeycomb-like structure. In the UV-vis absorbing spectrum, it was observed that there is a new additional absorption band at 260 nm, and it was speculated that the absorption may be caused by defects on the surface and interface of honeycomb-like ZnO. The as-products showed high sensitivity and short response time to sulfured hydrogen gas. These results demonstrate that honeycomb-like ZnO conglomerations are very promising materials for fabricating H2S gas sensors. 展开更多
关键词 ZnO Precipitation Honeycomb-like Gas sensing property
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Opportunities for production and property research of neutron-rich nuclei around N=126 at HIAF 认领 引用 被引量：4
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作者 Shao-Bo Ma Li-Na Sheng +9 位作者 Xue-Heng Zhang Shi-Tao Wang Kai-Long Wang Chun-Wang Ma Hool-Jin Ong Zhi-Yu Sun Shu-Wen Tang Yu-Hong Yu Xin-Tong Du Xiao-Bao Wei 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2024年第6期101-113,共13页
The study of nuclide production and its properties in the N=126 neutron-rich region is prevalent in nuclear physics and astrophysics research.The upcoming High-energy FRagment Separator(HFRS)at the High-Intensity heav... The study of nuclide production and its properties in the N=126 neutron-rich region is prevalent in nuclear physics and astrophysics research.The upcoming High-energy FRagment Separator(HFRS)at the High-Intensity heavy-ion Accelerator Facility(HIAF),an in-flight separator at relativistic energies,is characterized by high beam intensity,large ion-optical acceptance,high magnetic rigidity,and high momentum resolution power.This provides an opportunity to study the production and properties of neutron-rich nuclei around N=126.In this paper,an experimental scheme is proposed to produce neutron-rich nuclei around N=126 and simultaneously measure their mass and lifetime based on the HFRS separator;the feasibility of this scheme is evaluated through simulations.The results show that under the high-resolution optical mode,many new neutron-rich nuclei approaching the r-process abundance peak around A=195 can be produced for the first time,and many nuclei with unknown masses and lifetimes can be produced with high statistics.Using the time-of-flight corrected by the measured dispersive position and energy loss information,the cocktails produced from 208 Pb fragmentation can be unambiguously identified.Moreover,the masses of some neutron-rich nuclei near N=126 can be measured with high precision using the time-of-flight magnetic rigidity technique.This indicates that the HIAF-HFRS facility has the potential for the production and property research of neutron-rich nuclei around N=126,which is of great significance for expanding the chart of nuclides,developing nuclear theories,and understanding the origin of heavy elements in the universe. 展开更多
关键词 HFRS Fragmentation Neutron-rich nuclei around N=126 Mass measurement Lifetime
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Multi-layer phenomena in petawatt laser-driven acceleration of heavy ions 认领 引用 被引量：2
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作者 苏琬晴 曹喜光 +2 位作者 马春旺 王玉廷 张国强 《Plasma Science and Technology》 SCIE EI CAS CSCD 2024年第2期70-76,共7页
Laser-accelerated high-flux-intensity heavy-ion beams are important for new types of accelerators.A particle-in-cell program(Smilei) is employed to simulate the entire process of Station of Extreme Light(SEL) 100 PW l... Laser-accelerated high-flux-intensity heavy-ion beams are important for new types of accelerators.A particle-in-cell program(Smilei) is employed to simulate the entire process of Station of Extreme Light(SEL) 100 PW laser-accelerated heavy particles using different nanoscale short targets with a thickness of 100 nm Cr, Fe, Ag, Ta, Au, Pb, Th and U, as well as 200 nm thick Al and Ca. An obvious stratification is observed in the simulation. The layering phenomenon is a hybrid acceleration mechanism reflecting target normal sheath acceleration and radiation pressure acceleration, and this phenomenon is understood from the simulated energy spectrum,ionization and spatial electric field distribution. According to the stratification, it is suggested that high-quality heavy-ion beams could be expected for fusion reactions to synthesize superheavy nuclei. Two plasma clusters in the stratification are observed simultaneously, which suggest new techniques for plasma experiments as well as thinner metal targets in the precision machining process. 展开更多
关键词 petawatt laser-plasma interaction laser-driven heavy-ion accelerator for synthesizing superheavy nuclei particle-in-cell multi-layer phenomena target fabrication
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Elucidating the removal mechanism of N,N-dimethyldithiocarbamate in an anaerobic-anoxic-oxic activated sludge system 认领 引用 被引量：2
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作者 Yongmei Li Xianzhong Cao Lin Wang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2014年第3期566-574,共9页
N,N-Dimethyldithiocarbamate （DMDTC） is a typical precursor of N-nitrosodimethylamine （NDMA）. Based on separate hydrolysis, sorption and biodegradation studies of DMDTC, a laboratory-scale anaerobic-anoxic-oxic （... N,N-Dimethyldithiocarbamate （DMDTC） is a typical precursor of N-nitrosodimethylamine （NDMA）. Based on separate hydrolysis, sorption and biodegradation studies of DMDTC, a laboratory-scale anaerobic-anoxic-oxic （AAO） system was established to investigate the removal mechanism of DMDTC in this nutrient removal biological treatment system. DMDTC hydrolyzed easily in water solution under either acidic conditions or strong alkaline conditions, and dimethylamine （DMA） was the main hydrolysate. Under anaerobic, anoxic or oxic conditions, DMDTC was biodegraded and completely mineralized. Furthermore, DMA was the main intermediate in DMDTC biodegradation. In the AAO system, the optimal conditions for both nutrient and DMDTC removal were hydraulic retention time 8 hr, sludge retention time 20 day, mixed-liquor return ratio 3：1 and sludge return ratio 1：1. Under these conditions, the removal efficiency of DMDTC reached 99.5%; the removal efficiencies of chemical organic demand, ammonium nitrogen, total nitrogen and total phosphorus were 90%, 98%, 81% and 93%, respectively. Biodegradation is the dominant mechanism for DMDTC removal in the AAO system, which was elucidated as consisting of two steps： first, DMDTC is transformed to DMA in the anaerobic and anoxic units, and then DMA is mineralized to CO2 and NH3 in the anoxic and oxic units. The mineralization of DMDTC in the biological treatment system can effectively avoid the formation of NDMA during subsequent disinfection processes. 展开更多
关键词 N N-dimethyldithioc arbamate hydrolysis biodegradation aerobic processes anaerobic processes wastewater treatment
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Synthesis of Some Novel 2,3-diaryl-Butadiene Analogues 认领 引用
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作者 Jun Biao CHANG Juan HE +1 位作者 Rong Feng CHEN Jing Xi XIE 《Chinese Chemical Letters》 SCIE CAS 2001年第1期15-18,共4页
In present paper, the 2,3-diaryl-butadiene analogues were synthesized as anti-cancer agents. The structures were confirmed by (HNMR)-H-1 and elemental analysis.
关键词 2,3-dibenzyl-2-butene coupling reaction carbonyl compounds
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Radiation pre-vulcanization effect on properties of the truck tyre's transition layer and the truck tyre 认领 引用 被引量：2
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作者 YANG Mingcheng ZHANG Benshang +4 位作者 ZHU Jun LI Zhaopeng LI Kunhao GUO Dongquan ZHANG Hongna 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2013年第2期31-35,共5页
In this paper,the natural rubber is chosen as the main constituents for the transition layer of all-steel load radial tyre,which is pre-vulcanized by 500-keV E-beam irradiation of up to 60 kGy.The results show that th... In this paper,the natural rubber is chosen as the main constituents for the transition layer of all-steel load radial tyre,which is pre-vulcanized by 500-keV E-beam irradiation of up to 60 kGy.The results show that the green strength of transitional layer increases with the dose,reaching four times as much as the control(without irradiation) at 60 kGy.The final mechanical properties do not differ significantly from those of the control except that the aging and fatigue performance increased.However,thickness of the natural rubber transitional layer for an average single tyre can be reduced by 1 mm(or 1.5 kg) without obvious adverse effect on tyre performance. 展开更多
关键词 抗疲劳性能 过渡层 卡车轮胎 预硫化 全钢载重子午线轮胎 电子束照射 辐射 生坯强度
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Sulfamic acid as a cost-effective and recyclable solid acid catalyst for Friedel-Crafts alkylation of indole withα,β-unsaturated carbonyl compound and benzyl alcohol 认领 引用 被引量：2
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作者 Jing Yang Juan Zhang +3 位作者 Tian Tian Chen De Mei Sun Ji Li Xue Fen Wu 《Chinese Chemical Letters》 SCIE CAS CSCD 2011年第12期1391-1394,共4页
Sulfamic acid was proved to be a cost-effective and recyclable catalyst for Friedel-Crafts type reaction of indole withα,β-unsaturated carbonyl compound and benzyl alcohol.Various indoles,α,β-unsaturated carbonyl ... Sulfamic acid was proved to be a cost-effective and recyclable catalyst for Friedel-Crafts type reaction of indole withα,β-unsaturated carbonyl compound and benzyl alcohol.Various indoles,α,β-unsaturated carbonyl compounds and a benzyl alcohol were successfully used in this type of reaction,and the corresponding products were obtained in good to excellent yields. 展开更多
关键词 Sulfamic acid Michael reaction of indole Acid catalysis Alkylation of indole with benzyl alcohol
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Synthesis and Characterization of Y-Doped SnO_2 as Sensor Materials 认领 引用 被引量：2
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作者 李超 毕磊 +4 位作者 方少明 徐甲强 桂阳海 吴诗德 陈荣峰 《Journal of Rare Earths》 SCIE EI CAS 2007年第S1期505-507,共3页
Yttrium-doped SnO2 powders were successfully synthesized by solution co-precipitation method and characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The sensitivity of sensors based on... Yttrium-doped SnO2 powders were successfully synthesized by solution co-precipitation method and characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The sensitivity of sensors based on Y-doped SnO2 and SnO2 nanocrystals were investigated comparatively. The results indicated that Y-doped SnO2 was with the result of enhancement of sensitivity and selectivity to ethanol and reduction of sensitivity to other gas components. The enhancements of selectivity and sensitivity could be contributed to for two reasons. The first is that rare metal yttrium has a high alkalescence and good catalysis, and the second is that the nanosized crystallite and large specific surface area of Y-doped SnO2 is advantageous for gas-diffusion control as well as an increase in active sites for gas detection. 展开更多
关键词 Y-doped SnO_2 co-precipitation method sensor material sensitivity properties rare earths
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Low-Complexity Channel Estimation for RIS-Assisted ISAC System 认领 引用
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作者 Chen Zhen Li Jianqing +1 位作者 Zhang Haijun Zhang Wei 《China Communications》 SCIE EI CSCD 2025年第4期296-308,共13页
Integrated sensing and communication(ISAC),assisted by reconfigurable intelligent surface(RIS)has emerged as a breakthrough technology to improve the capacity and reliability of 6G wireless network.However,a significa... Integrated sensing and communication(ISAC),assisted by reconfigurable intelligent surface(RIS)has emerged as a breakthrough technology to improve the capacity and reliability of 6G wireless network.However,a significant challenge in RIS-ISAC systems is the acquisition of channel state information(CSI),largely due to co-channel interference,which hinders meeting the required reliability standards.To address this issue,a minimax-concave penalty(MCP)-based CSI refinement scheme is proposed.This approach utilizes an element-grouping strategy to jointly estimate the ISAC channel and the RIS phase shift matrix.Unlike previous methods,our scheme exploits the inherent sparsity in RIS-assisted ISAC channels to reduce training overhead,and the near-optimal solution is derived for our studied RIS-ISAC scheme.The effectiveness of the element-grouping strategy is validated through simulation experiments,demonstrating superior channel estimation results when compared to existing benchmarks. 展开更多
关键词 channel estimation element grouping integrated sensing and communication(ISAC) RIS
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Structural and Electrochemical Properties of Ceria-Doped SnO_2 Prepared by Sol-Gel Method 认领 引用
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作者 李超 毕磊 +4 位作者 方少明 许炎妹 王焕新 徐甲强 陈荣峰 《Journal of Rare Earths》 SCIE EI CAS 2007年第S1期512-514,共3页
Tin dioxide (SnO2) and Ce-doped SnO2 were successfully synthesized by sol-gel method and electrochemical properties were studied in cell with Li as counter electrode. The samples were characterized by X-ray diffractio... Tin dioxide (SnO2) and Ce-doped SnO2 were successfully synthesized by sol-gel method and electrochemical properties were studied in cell with Li as counter electrode. The samples were characterized by X-ray diffraction (XRD) and Transmission electron microscopy (TEM). XRD patterns presented that a second phase (CeO) was observed when the Ce content reached 5%. TEM micrograph indicated that Ce-doped SnO2 had a small particle with mean size of 30 nm. The electrochemical properties were also characterized at room temperature, and the results demonstrated that the Ce-doped SnO2 samples exhibited promising electrochemical properties and Ce doped in as-prepared samples plays an important role. 展开更多
关键词 Ce-doped SnO_2 sol-gel method anode material lithium-ion battery rare earths
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微波辅助磁性固体酸催化纤维素水解的研究 认领 引用 被引量：8
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作者 李学琴 李翔宇 +2 位作者 时君友 段喜鑫 雷廷宙 《林产工业》 北大核心 2017年第3期15-20,共6页
以生物质基磁性固体酸为催化剂,采用微波相结合的辅助手法对预处理的微晶纤维素进行水解研究。以还原糖得率为指标,通过单因素试验和正交试验(四因素三水平)考察水解时间、水解温度、纤维素与催化剂量的比例和微波功率对纤维素水解的影... 以生物质基磁性固体酸为催化剂,采用微波相结合的辅助手法对预处理的微晶纤维素进行水解研究。以还原糖得率为指标,通过单因素试验和正交试验(四因素三水平)考察水解时间、水解温度、纤维素与催化剂量的比例和微波功率对纤维素水解的影响,利用红外光谱(FT-IR)分析纤维素水解残渣。结果表明,微波辅助生物质基磁性固体酸催化剂催化纤维素水解的最佳工艺条件为:水解时间30 min、水解温度80℃、催化剂量与纤维素的比例2:1、微波功率450 W,此时还原糖得率最高,达57.4%;4个因素对纤维素水解影响的主次顺序为:微波功率>催化剂量>水解时间>水解温度。FT-IR分析表明微波辅助纤维素水解残渣中几乎没有纤维素存在,即纤维素基本被完全水解。 展开更多
关键词 生物质 磁性固体酸催化剂 微波辅助 纤维素
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SPAGINS:semiempirical parameterization for fragments in gamma-induced nuclear spallation 认领 引用 被引量：2
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作者 Hui‑Ling Wei Meng‑Die Zhou +8 位作者 Pu Jiao Yu‑Ting Wang Jie Pu Kai‑Xuan Cheng Ya‑Fei Guo Chun‑Yuan Qiao Gong‑Tao Fan Hong‑Wei Wang Chun‑Wang Ma 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2023年第12期112-122,共11页
From the empirical phenomena of fragment distributions in nuclear spallation reactions,semiempirical formulas named SPAGINS were constructed to predict fragment cross-sections in high-energyγ-induced nuclear spallati... From the empirical phenomena of fragment distributions in nuclear spallation reactions,semiempirical formulas named SPAGINS were constructed to predict fragment cross-sections in high-energyγ-induced nuclear spallation reactions(PNSR).In constructing the SPAGINS formulas,theoretical models,including the TALYS toolkit,SPACS,and Rudstam formulas,were employed to study the general phenomenon of fragment distributions in PNSR with incident energies ranging from 100 to 1000 MeV.Considering the primary characteristics of PNSR,the SPAGINS formulas modify the EPAX and SPACS formulas and efficiently reproduce the measured data.The SPAGINS formulas provide a new and effective tool for predicting fragment production in PNSR. 展开更多
关键词 High-energy gamma-rays Spallation reaction Fragment cross-section Empirical formula EPAX SPACS TALYS
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A New Flavone Glycoside from Epimedium koreanum 认领 引用 被引量：3
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作者 Hai Yan ZHANG Tian Zeng ZHAO +1 位作者 Wei Ping YIN Ming Jian WU 《Chinese Chemical Letters》 SCIE CAS 2006年第10期1328-1330,共3页
A novel flavone glycoside named 3＇＇＇-carbonyl-2＇＇-β-L-quinovosyl icariside Ⅱ was isolated from the aerial parts of Epimedium koreanum. Its chemical structure was elucidated on the basis of spectral analysis.
关键词 Epimedium koreanum aerial parts flavone glycoside 3＇＇＇-carbonyl-2＇＇＇-β-L-quinovosylicariside II.
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响应面优化生物质玉米秸秆催化液化工艺研究 认领 引用 被引量：4
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作者 李学琴 雷廷宙 +3 位作者 李翔宇 时君友 王志伟 关倩 《林产工业》 北大核心 2017年第7期26-30,共5页
以获取高得率的生物质液化油为目的,利用生物质玉米秸秆为原料,液化时间、液化温度、催化剂的量为影响因素设计Box-Behnken试验,得到试验因素之间的定量数学模型和交互作用对玉米秸秆液化率的影响,采用响应面法确定玉米秸秆催化液化的... 以获取高得率的生物质液化油为目的,利用生物质玉米秸秆为原料,液化时间、液化温度、催化剂的量为影响因素设计Box-Behnken试验,得到试验因素之间的定量数学模型和交互作用对玉米秸秆液化率的影响,采用响应面法确定玉米秸秆催化液化的最佳工艺条件。结果表明,试验数据建立的二次多项式数学模型显著性极高(P<0.000 1),相关系数R^2=0.953 8,预测值与试验值具有很好的拟合度。当液化时间为63.66 min、液化温度为162.43℃和催化剂的量为4.02%时为最佳的催化液化条件;在该工艺条件下,玉米秸秆的液化率为98.88%,预测值为98.87%,二者相差0.01%;由此得出响应面法优化玉米秸秆催化液化工艺参数更加精准可靠,具有一定的参考价值。 展开更多
关键词 生物质 玉米秸秆 响应面法 催化液化
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Synthesis and Anti-SIV Activity in vitro of Novel 4,4'-Dimethoxy-5,6,5',6'- dimethenedioxy-2-alkyloxycarbonyl Biphenyl Derivatives 认领 引用
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作者 CHENG,Sen-Xiang WANG,Li-Min CHANG,Jun-Biao QU,Ling-Bo CHEN,Rong-Feng XIE,Jing-Xi 《有机化学》 SCIE CAS 北大核心 2004年第Z1期346-347,共2页
　　4,4'-Dimethoxy-5,6,5',6'-dimethenedioxy-2,2'-dimethoxycarbonyl biphenyl (DDB, 1) and its derivatives show anti-HBV and anti-HIV activities.[1] However, their poor solubility was not in favor of bio... 　　4,4'-Dimethoxy-5,6,5',6'-dimethenedioxy-2,2'-dimethoxycarbonyl biphenyl (DDB, 1) and its derivatives show anti-HBV and anti-HIV activities.[1] However, their poor solubility was not in favor of bioavailability.[2,3] In addition,other anti-HIV agents[4] with piperazine moiety have been investigated. Their saturated nitrogen-containing heterocyclic groups play the role of pharmaco-effectivity.[5] It was assumed that the combination of DDB with substituted benzyl piperazines would produce some new compounds with activity against anti-HIV. Therefore, we designed and synthesized a class of novel 4,4'-dimethoxy-5,6,5',6'-dimethenedioxy biphenyls modified by substituted piperazines, and partly evaluated their anti-SIV activity.…… 展开更多
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Method for pests detecting in stored grain based on spectral residual saliency edge detection 认领 引用 被引量：6
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作者 Yao Qin Yanli Wu +1 位作者 Qifu Wang Suping Yu 《Grain & Oil Science and Technology》 CAS 2019年第2期33-38,共6页
Pests detecting is an important research subject in grain storage field.In the past decades,many edge detection methods have been applied to the edge detection of stored grain pests.Although some of them can realize t... Pests detecting is an important research subject in grain storage field.In the past decades,many edge detection methods have been applied to the edge detection of stored grain pests.Although some of them can realize the stored grain pests detecting,precision and robustness are not good enough.Spectral residual(SR)saliency edge detection defines the logarithmic spectrumof image as novelty part of the image information.The remaining spectrumis converted to the airspace to obtain edge detection results.SR algorithm is completely based on frequency domain processing.It not only can effectively simplify the target detection algorithm,but also can improve the effectiveness of target recognition.The experimental results show that the edge results of stored grain pests detected by SR method are effective and stable. 展开更多
关键词 Stored grain pests Saliency detection Spectral residual (SR) Edge detection
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