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Hybrid prefix OFDM with spatial modulation toward terahertz broadband transmission

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Science China(Information Sciences) 2020年第8期63卷 53-55页

作者： Tiebin WANG Weipeng JING Wenlong SONG Information and Computer Engineering College Northeast Forestry University

Dear editor,In the development of 6G, terahertz communications [1] have attracted much attention owing to their potential for providing wireless broadband connections with even higher frequency resources. Furthermore, new transmission technologies have been widely considered for supporting future 6G systems [2]. Specifically, the spatial

关键词： spatial modulation ofdm cyclic prefix terahertz multiple path fading

Design Strategy of Infrared 4-Hydroxybenzylidene-imidazolinone-Type Chromophores based on Intramolecular Charge Transfer:a Theoretical Perspective

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化学物理学报(英文) 2023年第5期36卷 582-592,I0002页

作者： Jian song wenlong Liang Shouning Yang Huayan Yang School of Physics Henan Normal UniversityXinxiang 453007China NMPA Key Laboratory for Research and Evaluation of Innovative Drug Henan Key Laboratory of Organic Functional Molecule and Drug InnovationCollaborative Innovation Center of Henan Province for Green Manufacturing of Fine ChemicalsSchool of Chemistry and Chemical EngineeringHenan Normal UniversityXinxiang 453007China

Partial genetically encoded 4-hy-droxybenzylidene-imidazolinone(HBI)-type chromophores are new promising fluorescent probes,which are suitable for imaging and detection of living cells.How-ever,the lack of infrared chro-mophores hinders the develop-ment seriously.Here more than 30 HBI-type chromophores with reg-ular structure modifications were employed and typical spectral redshift change laws and mechanisms were investigated by quantum methods.Results show that both one-photon spectrum(OPS,absorption/emission)and two-photon absorption(TPA)can achieve large redshift via either extending conjugated lengths of frag-3 or enlarging conjugated areas of frag-1 of HBI skeleton.Spectral redshifts of all chromophores are highly related to intramolecular charge transfer(ICT),but neutral ones are closely related to the total ICT or electron-accept-ing-numbers of frag-3,and the high correlative factor of anions is the aromaticity of frag-2 bridge.The frag-2 bridge with high aromaticity can open a reverse charge transfer channel in anion relative to neutral,obtaining significant redshift.Based on analysis,a new 6-hydroxyl-naphthalene-imidazolinone(HNI)series,which have larger conjugated area in frag-1,are pre-dicted.The OPS and TPA of anionic HNI ones acquire about 76−96 nm and 119−146 nm red-shift relative to traditional HBI series respectively as a whole.The longest emission of anionic HNI-4 realizes more 244 nm redshift relative to HBI-1.Our work clarifies worthy spectral reg-ularities and redshift mechanisms of HBI-type chromophores and provides valuable design strategy for infrared chromophores synthesis in experiment.

关键词： Intramolecular charge transfer Near-infrared fluorescent chromophore 4-Hy-droxybenzylidene-imidazolinone One-photon spectrum Two-photon absorption

Effect of different operation conditions on PCDD/F inhibition by ammonium dihydrogen phosphate:concentrations,distributions and mechanisms

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Waste Disposal and Sustainable Energy 2024年第1期6卷 11-23页

作者： Jiayao Wu Weican Xiang Xiaoxiao Wang Wenlong SONG Yuxuan Ying Xiaoqing Lin Xiaodong Li State Key Laboratory of Clean Energy Utilization National Engineering Laboratory of Waste Incineration Technology and EquipmentInstitute of Thermal Power Engineering of Zhejiang UniversityHangzhou310027ZhejiangChina

Phosphorus-containing compounds are considered as the potential alternatives of traditional inhibitors for suppressing the formation of polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs),but the suppression characteristics are scarcely studied.In this study,ammonium dihydrogen phosphate(ADP)was selected as the inhibitor to inhibit the PCDD/F formation via de novo synthesis at 350℃.The influence of oxygen content and addition method on PCDD/F inhibition was systematically investigated by means of statistical analysis and morphological characterization.The results showed that oxygen enhanced the formation of PCDD/Fs from 1470 ng g^(−1)(9.78 ng I-TEQ g^(−1))to 2110 ng g^(−1)(14.8 ng I-TEQ g^(−1)).ADP significantly inhibited the PCDD/F formation,with inhibition efficiencies ranging from 82.0%to 97.7%.Herein,a higher oxygen content and the premixed way intensified the suppression effect.Dibenzo-p-dioxin(DD)/dibenzofuran(DF)chlorination was proven to be effectively suppressed while chlorophenol(CP)route was not obviously influenced.With the addition of ADP,Cl source was significantly reduced and the formation of organic Cl was effectively inhibited.Also,it decreased the proportion of C–O/C=N and C=O,revealing the efficient inhibition of carbon oxidation.Meanwhile,the formation of copper phosphate and copper pyrophosphate was observed in XPS(X-ray photoelectron spectroscopy)spectra,indicating that the catalytic metal Cu was chelated and passivated by ADP.The premixed way had a better effect on reducing Cl resources,inhibiting oxidation and chelating metals,due to the direct contact with inhibitor.However,the separation method could only depend on the decomposed gases,resulting in a lower inhibition efficiency.

关键词： Ammonium dihydrogen phosphate Polychlorinated dibenzo-p-dioxins and dibenzofuran inhibition Oxygen content Adding way Mechanisms

Measurement of lumber moisture content based on PCA and GSSVM

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Journal of Forestry Research 2018年第2期29卷 547-554页

作者： Jiawei Zhang Wenlong SONG Bin Jiang Mingbao Li Northeast Forestry University Harbin 150040People’s Republic of China Harbin Research Institute of Electrical Instrument HarbinPeople’s Republic of China

Lumber moisture content(LMC) is the important parameter to judge the dryness of lumber and the quality of wooden products.Nevertheless the data acquired are mostly redundant and incomplete because of the complexity of the course of drying,by interference factors that exist in the dryness environment and by the physical characteristics of the lumber itself.To improve the measuring accuracy and reliability of LMC,the optimal support vector machine(SVM) algorithm was put forward for regression analysis LMC.Environmental factors such as air temperature and relative humidity were considered,the data of which were extracted with the principle component analysis method.The regression and prediction of SVM was optimized based on the grid search(GS) technique.Groups of data were sampled and analyzed,and simulation comparison of forecasting performance shows that the main component data were extracted to speed up the convergence rate of the optimum algorithm.The GS-SVM shows a better performance in solving the LMC measuring and forecasting problem.

关键词： Lumber moisture content(LMC) Principle component analysis(PCA) Grid search(GS) Support vector machine(SVM)

Thermally activated delayed fluorescence molecules and their new applications aside from OLEDs

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Chinese Chemical Letters 2019年第10期30卷 1717-1730页

作者： wenlong Chen Fengling song State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalian 116024China Institute of Molecular Sciences and Engineering Shandong UniversityQingdao 266237China

Thermally activated delayed fluorescence(TADF) organic molecules feature with long-lived delayed fluorescence, because they can undergo not only efficient intersystem crossing(ISC), but also efficient reverse intersystem crossing(RISC) at room temperature. As a new type of luminescent molecules, they have exhibited successful applications in organic light emitting diodes(OLEDs). Aside from OLEDs, they are also found to have potential applications in time-resolved luminescence imaging based on long-lived fluorescence property. Meanwhile, due to their excited triplet characteristic originated from efficient ISC,they were found to be applied in triplet-triplet annihilation upconversion(TTA-UC), photodynamic therapy(PDT) and organic photocatalytic synthesis. This review briefly summarizes the characteristics and excellent photophysical properties of TADF organic compounds, then covers their applications to date aside from OLEDs based on their highly efficient ISC ability and RISC ability at room temperature.

关键词： Thermally activated delayed fluorescence Intersystem crossing Time-resolved luminescence Triplet-triplet annihilation upconversion Photodynamic therapy Organic photocatalytic synthesis

Carbon dots-enhanced pH-responsive lubricating hydrogel based on reversible dynamic covalent bondings

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Chinese Chemical Letters 2024年第5期35卷 232-237页

作者： Jianye Kang Xinyu Yang Xuhao Yang Jiahui Sun Yuhang Liu Shutao Wang Wenlong SONG State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China CAS Key Laboratory of Bio-inspired Materials and Interfacial Science CAS Center for Excellence in NanoscienceTechnical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Due to the various pH liquid environment in nature,the pH-responsive lubricating hydrogel is widely investigated and developed for tissue interface substitute.However,the applied liquid environment will lead to poor mechanical property and weaken the pH-responsive capability.In this work,a carbon dotsenhanced pH-responsive lubricating hydrogel is developed by combining a pH-responsive section of dynamic PVA-borax network into a PAAm covalent polymer network.The formed hydrogel presents a partial gel-sol transition under controlled pH environments.At low pH environments(<6.0),the formed lubricating layer originated from dynamic disassembly of PVA-borax hydrogel,and brings the lubricating properties on the hydrogel surface.Moreover,the mechanical strength and lubrication properties are well promoted by introducing the carbon dots into the hydrogel,the blue sol layer can be observed more visually under the fluorescence microscope.The pH-response also exhibits well reversibility.The prepared hydrogel broadens the idea for designing pH-responsive soft materials for soft lubricating actuator or robot.

关键词： pH-responsive Carbon dots Dynamic covalent bonding Lubrication

Robust optimization for volume variation in timber processing

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Journal of Forestry Research 2018年第1期29卷 247-252页

作者： Wei Wang Yongzhi Zhang Jun Cao Wenlong SONG Northeast Forestry University Harbin 150040 People's Republic of China

Volume variation is an uncertainty element which affects timber processing. We studied the volume variation of logs caused by quality defects in traditional timber processing and set up an optimization approach,using a robust optimization method. We used total number of acceptable boards produced to study the relationship between board thickness and raw material logs, using a heuristic search algorithm to control the variation of board volume to improve the output of boards, reduce the quantity of by-products, and lower production costs. The robust optimization method can effectively control the impact of volume variations in timber processing, reduce cutting waste as far as possible using incremental processing and increase profits, maximize the utilization ratio of timber, prevent waste in processing, cultivate the productive type of tree species and save forest resources.

关键词： Timber mill Volume variation Heuristic search algorithm Robust optimization

Krein-space approach to robust fltering for uncertain systems with time-varying bias

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控制理论与应用（英文版） 2013年第4期11卷 634-641页

作者： Heming JIA Wenlong SONG Jin FENG College of Mechanical and Electrical Engineering Northeast Forestry University College of Automation Harbin Engineering University

In this paper, a novel Krein space approach to robust estimation for uncertain systems with accumulated bias is proposed. The bias is impacted by system uncertainties and exists in both state transition and observer matrices. Initial conditions and cross-correlated uncertainty inputs are described by the sum quadratic constraint （SQC）. Without modifying the SQC, the minimal state of the SQC is obtained through Krein space method. The inertia condition for a minimum of a deterministic quadratic form is derived when the coefficient of observer uncertainty input is non-unit matrix. Recursions of Krein space state filtering and bias filtering are developed respectively. Since the cross correlation between uncertainties is considered, a cross correlation gain is introduced into the posteriori estimator. Finally, a numerical example illustrates the performance of the proposed filter.

关键词： Linear system Parameter uncertainty Time-varying bias Sum quadratic form Krein space linear estimation

Supramolecular Semi-convertible Hydrogel Enabled Self-Healing Responsive Lubrication Under Dynamic Shearing

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CCS Chemistry 2023年第11期5卷 2482-2496页

作者： Xuewei Zhang Kaiyao Shi Xuhao Yang Jian Wang Huan Liu Wenlong SONG Shutao Wang State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130023 Department of Cardiology Jilin Provincial Key Laboratory for Genetic Diagnosis of Cardiovascular DiseaseChina-Japan Union Hospital of Jilin UniversityChangchun 130023 CAS Key Laboratory of Bio-inspired Materials and Interfacial Science CAS Center for Excellence in NanoscienceTechnical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190 University of Chinese Academy of Sciences Beijing 100190 Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeijing Advanced Innovation Center for Biomedical EngineeringInternational Research Institute for Multidisciplinary ScienceBeihang UniversityBeijing 100191

Cartilage-inspired hydrogel has attracted great interest due to its tunable mechanics and low friction.However,it is incapable of self-healing under a complex dynamic shearing environment.In this work,a self-healing semi-convertible hydrogel(SHSCH)is developed,which can recover its unique active lubricating function under shearing.Based on the cooperating strategy of noncovalent and covalent bonding,the SHSCH is composed of three interpenetrated networks including:(1)shearresponsive N-fluorenylmethoxycarbonyl-L-tryptophan(FT)supramolecular network,(2)self-healing polyhydroxyethyl acrylamide(PHEAA)network,and(3)rigid polyvinyl alcohol(PVA)covalent network.The shearresponsive lubricating function and mechanical property can be self-healed under a shearing environment through the noncovalent hydrogen-bonding assembly of PHEAA associated by theπ–πassembly of FT.The asdeveloped SCH provides a self-healing model comparable with traditional self-healing lubricating materials through encapsulating lubricant microcapsules or infusing lubricants onto surfaces.We demonstrated a proofof-concept of the self-healing lubrication of a simplified artificial worn cartilage model under a dynamic shearing condition.This study will offer a potential strategy on designing the self-healing soft devices under dynamic stimuli far beyond the lubricating materials.

关键词： semi-convertible hydrogel self-healing shear response lubrication supramolecular hydrogel