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Investigation of the roles of lignin in biomass-based hydrogel for efficient desalination

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Frontiers of Chemical Science and Engineering 2023年第7期17卷 954-965页

作者： Qizhao Shao lan sun Xinzhou Wu Dafeng Zheng School of Chemistry and Chemical Engineering Guangdong Engineering Research Center for Green Fine ChemicalsSouth China University of TechnologyGuangzhou 510640China

The shortage of freshwater has become a global challenge,and solar-driven interfacial evaporation for desalination is a promising way to alleviate the *** develop highly efficient and environmentally friendly photothermal evaporator,the hydroxyethyl cellulose(HEC)/alkaline lignin(AL)/graphene oxide(GO)hydrogels(CLGs)with remarkable evaporative performance were successfully fabricated by a facile solgel method using biomass *** influence of AL content on the physicochemical properties of the evaporator was *** increasing content of AL improves the mechanical properties,saturated water content and crosslink density of the *** designed materials exhibit outstanding thermal insulation capacity(the thermal conductivity of less than 0.05 W·m^(–1)·K^(-1))and high light absorption capacity of more than 97%.The solar evaporation efficiency and water evaporation rate of the HEC/64 wt%of AL/GO hydrogels(CLG4)achieve 92.1%and 2.55 kg·m^(–2)·h^(-1) under 1 sun,*** salt resistance test results reveal that the evaporation rate of the CLG4 can still reach 2.44 kg·m^(–2)·h^(–1) in 3.5 wt% NaCl *** solar evaporation rate of the CLG4 can maintain in the range of 2.45–2.59 kg·m^(–2)·h^(–) in five *** low-cost lignin-based photothermal evaporator offers a sustainable strategy for desalination.

关键词： lignin photothermal cellulose desalination hydrogel

Theoretical Study on Reaction Mechanism of Aluminum-Water System

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Chinese Journal of Chemical Physics 2008年第3期21卷 245-249页

作者： Yun-lan sun Yan Tian Shu-fen Li Department of Chemical Physics University of Science and Technology of China Hefei 230026 China School of Metallurgy and Resources Anhui University of Technology Maanshan 243002 China

A theoretical study on the reaction of aluminum with water in the gas phase was performed using the hybrid density functional B3LYP and QCISD（T） methods with the 6-311＋G（d,p） and the 6-311＋＋G（d,p） basis sets. The results show that there are three possible reaction pathways that involve four isomers, seven transition structures, and two possible products for the reaction of aluminum with water. The two most favorable reaction pathways were found, whose intermediates and products agreed quite well with experimental results. The enthalpy and Gibbs free energy change of the reaction between A1 and H2O at 298 and 2000 K were calculated. Some results are also in good agreement with the previous calculations or experimental results.

关键词： Aluminum Water Reaction mechanism Hybrid density functional theory

The IOD signal in the upper-ocean Indonesian Throughflow since the mid-1970s

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Acta Oceanologica Sinica 2007年第4期26卷 1-6页

作者： lan Jian sun Shuangwen HONG Jieli Physical Oceanography Laboratory Ocean University of China Qingdao 266100 China

On the basis of simple ocean data assimilation （SODA） reanalysis product, the interannual variability of upper-ocean Indonesian Throughflow （ITF） volume transport since the mid 1970s is examed. The wavelet analysis shows a second prominent interannual oscillation with a period of about 2 ～ 4 a. To reveal any relationship between this band-scale oscillation of upper-ocean ITF and the Indian Ocean dipole （IOD）, the correlation and wavelet analyses are used. The correlation coefficient between the upper-ocean ITF and the IOD reaches - 0.40 with upper-ocean ITF lagging an IOD index by eight months. The wavelet power spectrum of upper-ocean ITF shows similar structure to that of the IOD index. And the evolution of IOD is reproduced by lagged correlation between the upper-ocean ITF and the sea surface temperature anomaly （SSTA） over the Indian Ocean. It suggests that the 2 ～ 4 a band-scale oscillation of upper-ocean ITF is related uniquely to the IOD over the tropical Indian Ocean.

关键词： Indonesian Throughflow Indian Ocean dipole interannual variability

An ultra-sensitive metasurface biosensor for instant cancer detection based on terahertz spectra

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Nano Research 2023年第5期16卷 7304-7311页

作者： Peiliang Wang Jing Lou Yun Yu lang sun lan sun Guangyou Fang Chao Chang Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100094China Innovation Laboratory of Terahertz Biophysics National Innovation Institute of Defense TechnologyBeijing 100071China The Key Laboratory of Electromagnetic Radiation and Sensing Technology Chinese Academy of SciencesBeijing 100190China School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China Air and Missile Defense College Air Force Engineering UniversityXi’an 710051China Institute of Acupuncture and Moxibustion China Academy of Chinese Medical SciencesBeijing 100007China School of Psychological and Cognitive Sciences Beijing Key Laboratory of Behavior and Mental HealthPeking UniversityBeijing 100871China School of Life Science and Technology Xi’an Jiaotong UniversityXi’an 710049China

Metasurface biosensors have become the core label-free and rapid-detection technology in *** cancer and brain cancer are the first leading causes of cancer death among adults and adolescents,respectively,where poor early diagnosis results from expensive detection costs and time *** tackle the above problems,here,we introduce a terahertzdomain metasurface biosensor for cancer diagnosis,relying on a perfectly symmetrical periodic surface structure,which significantly exhibits polarization-insensitivity at 2.05 THz and the high-sensitivity of 504 GHz/RIU(RIU=refractive index unit).According to the frequency shifts and transmittance variations,four cell types are successfully distinguished from each *** minimum number of cells is required for thousands of cells to display the differences of spectra,which is 1/30 of clinical ***,the results were consistent with pathological results(the gold standard in clinic)by Gaussian curve *** proposed biosensor has really achieved the characterization of cells in normal and cancerous *** detection strategy dramatically reduced the cost of detection by reuse and time consumption was reduced to 1/20 of the pathology *** addition,it is flexible to set samples and easy to realize automatic operation due to the great polarization-insensitivity of the proposed biosensor,which can further reduce labor costs in the *** is envisioned that the proposed biosensor will present immense potential in the fields of cancer detection,distinguishing different cancers,identifying primary lesion cancer or metastatic cancer.

关键词： terahertz metasurface biosensor cancer detection

The Dynamics of a Prey-dependent Consumption Model Concerning Integrated Pest Management

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Acta Mathematica Sinica,English Series 2005年第3期21卷 541-554页

作者： Bing LIU Yu Juan ZHANG lan sun CHEN Li Hua sun Department of Mathematics Anshan Normal University Anshan 114005 P. R. China College of Mathematics and Systems Science Xinjiang University Urumqi 830046 P. R. China Deparment of Mathematics Anshan Normal University Anshan 114005 P. R. China Dalian University of Technology Dalian 116024 P. R. China Institute of Mathematics Academy of Mathematics and Systems Science Beijing 100080 P. R. China

A mathematical model for the dynamics of a prey-dependent consumption model concerning integrated pest management is proposed and analyzed. We show that there exists a globally stable pesteradication periodic solution when the impulsive period is less than some critical values. Furthermore, the conditions for the permanence of the system are given. By using bifurcation theory, we show the existence of a nontrival periodic solution if the pest-eradication periodic solution loses its stability. When the unique positive periodic solution loses its stability, numerical simulation shows there is a characteristic sequence of bifurcations, leading to a chaotic dynamics, which implies that dynamical behaviors of prey-dependent consumption concerning integrated pest management are very complex, including period-doubling cascades, chaotic bands with periodic windows, crises, symmetry-breaking bifurcations and supertransients.

关键词： IPM strategy Prey-dependent consumption model Impulsive effect Permanence Chaos

The Global Dynamics of a Class of Vector Fields in R3

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Acta Mathematica Sinica,English Series 2011年第12期27卷 2469-2480页

作者： Xin An ZHANG Zhao Jun LIANG lan sun CHEN School of Mathematics and Statistics Central China Normal University Wuhan 430079 P. R. China Institute of Mathematics Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 P. R. China

In this paper, .we find a bridge connecting a class of vector fields in R3 with the planar vector fields and give a criterion of the existence of closed orbits, heteroclinic orbits *** orbits of a class of vector fields in R3. All the possible nonwandering sets of this class of vector fields fall into three classes：（i） singularities; （ii） closed orbits; （iii） graphs of unions of singularities and the trajectories connecting them. The necessary and sufficient conditions for the boundedness of the vector fields are also obtained.

关键词： Tangent vector field invariant cone heteroclinic orbit vector field

Effects of graphite on the microstructure and properties of ultrafine WC-11Co composites by spark plasma sintering

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Rare Metals 2011年第1期30卷 63-67页

作者： sun lan YANG Tian＇en JIA Chengchang XIONG Ji School of Manufacturing Science and Engineering Sichuan University Chengdu 610065 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

Ultrafine WC-11Co hard metals added with different proportions of graphite were prepared by spark plasma sintering at 40 MPa/1200°C for 5 min,and the influence of graphite as free carbon on the microstructure and mechanical properties were *** XRD analysis showed that decarbonization could be prevented by adding *** hard metals composed of finer and more homogeneous WC grains with little flaws can be achieved after 0 wt.% to 1.5 wt.% graphite was *** hardness and fracture toughness increase initially with increasing graphite content,and with over 1.5 wt.% they descend due to coarse grains and more ***,1.5 wt.% graphite is the optimal addition content in view of the hardness and transverse rupture ***,the coercive force decreases while the saturated magnetic intensity increases with the increase of graphite content.

关键词： composite materials tungsten carbide cobalt graphite spark plasma sintering microstructure mechanical properties

Erosion–corrosion behavior of austenitic cast iron in an acidic slurry medium

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International Journal of Minerals,Metallurgy and Materials 2015年第6期22卷 598-603页

作者： Ke Yang lan sun Yu-zhen Liu Hong-yuan Fan School of Mechanical Engineering and Automation Xihua University School of Manufacturing Science and Engineering Sichuan University

A series of austenitic cast iron samples with different compositions were cast and a part of nickel in the samples was replaced by manganese for economic reason. Erosion–corrosion tests were conducted under 2wt% sulfuric acid and 15wt% quartz sand. The results show that the matrix of cast irons remains austenite after a portion of nickel is replaced with manganese.（Fe,Cr）3C is a common phase in the cast irons, and nickel is the main alloying element in high-nickel cast iron; whereas,（Fe,Mn）3C is observed with the increased manganese content in low-nickel cast iron. Under erosion–corrosion tests, the weight-loss rates of the cast irons increase with increasing time. Wear plays a more important role than corrosion in determining the weight loss. It is indicated that the processes of weight loss for the cast irons with high and low nickel contents are different. The erosion resistance of the cast iron containing 7.29wt% nickel and 6.94wt% manganese is equivalent to that of the cast iron containing 13.29wt% nickel.

关键词： cast irons erosion corrosion weight loss acidic environment

Evaluation of Slow Light Periodic Signals Considering the Distortion in EDF

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Chinese Physics Letters 2014年第3期31卷 82-85页

作者： WANG WU Chong-Qing WANG Zhi LIU Guo-Dong LIU lan-lan sun Zhen-Chao Institute of Optical Information and Key Lab of Luminescence and Optical Information Technology Beijing Jiaotong University Beijing 100044

Based on the fundamental harmonic phase delay, a new definition of fundamental harmonic fractional delay （FHFD） is proposed to evaluate slow light with the consideration of signal distortion, to eliminate the dependence on the choice of the reference point. By solving the rate equation of erbium-doped fiber （EDF）, it is shown that the slow light always accompanies the signal distortion when the periodic signal propagates in EDF, and FHFD depends on the signal distortion, as well as the average input power, the modulation depth and the length of EDF. The results of simulations and experiments indicate that the definition of FHFD is reasonable and effective to evaluate the slow light of periodic signals.

关键词： Signal distortion