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Oxygen Defects in Nanostructured Metal-Oxide Gas Sensors:Recent Advances and Challenges

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Chinese Journal of Chemistry 2020年第12期38卷 1832-1846页

作者： Wenjie Ding dandan liu Jiajia liu Jiatao Zhang Beijing Key Laboratory of Construction-Toiloroble Advanced Functional Materials and Green Applications Experimental Center of Advanced MaterialsSchool of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China

Defect engineering has been the most promising strategy to modulate the surface microstructure and electronic structure of the metal oxides,which wilgovern the efficiency of a given oxide for the applications in heterogeneous catalysis,energy storage and conversion fields,and gas *** reviewsummarizes recent research advances on understanding the role of oxygen vacancies of the metal oxides in gas *** different strategies foroxygen vacancy productions are summarized and ***,the proper characterization techniques for oxygen vacancy are ***,the structure-activity relationships between vacancy engineering and gas sensing ablity are further illustrted coupling the experimental results and theoretical ***,the key challenges and prospects regarding defect engineering in gas sensing are highlighted.

关键词： vacancy oxides Oxygen

Time series analysis model for forecasting unsteady electric load in buildings

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Energy and Built Environment

Energy and Built Environment 2024年第6期5卷 900-910页

作者： dandan liu Hanlin Wang Shanghai University of Electric Power Shanghai 201306China

Accurate and reliable load forecasting is crucial for ensuring the security and stability of the power *** paper proposes a combined prediction method based on Empirical Wavelet Transform(EWT)and Autoformer time series prediction model for the non-stationary and non-linear time series of electric *** original sequence is first decomposed by EWT to obtain a set of stable subsequences,and then the Autoformer time series prediction model is used to predict each ***,the prediction results of each subsequence are combined to obtain the final prediction *** proposed EWT-Autoformer prediction model is applied to an electric load example,and the experimental results are compared with the Recurrent Neural Network(RNN)method,Long Short-Term Memory(LSTM)method,and Informer method under the same *** experimental results indicate that compared to LSTM,the method proposed in the paper has an R2 improvement of 9–20 percentage points,an improvement of 6–8 percentage points compared to RNN,an improvement of 3–7 percentage points compared to Informer,and an improvement of 2–3 percentage points compared to *** addition,the RMSE and MAE are also significantly lower than other models.

关键词： Load forecasting EWT Neural networks Informer Autoformer

Influence of mineral species on oil-soil interfacial interaction in petroleum-contaminated soils

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Chinese Journal of Chemical Engineering 2023年第9期61卷 147-156页

作者： Yang Yang dandan liu Xing Liang Xiaobing Li National Center for Coal Preparation and Purification Engineering Research China University of Mining and TechnologyXuzhou 221116China School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116China

The mineral species in soils vary in a wide variety of places,thus resulting in the petroleumcontaminated soil(PCS)with complex ***,the research on the effect of mineral species on oil-soil interactions in PCS takes on a critical *** this study,the desorption and adsorption behaviors of aromatic hydrocarbons(Ar)on two minerals surfaces were ***,the interfacial forces between minerals and Ar were studied and the sources of these forces were ***,molecular dynamics(MD)simulations were conducted to gain insight into the interfacial interaction *** revealed by the results of this study,in comparison with Qs-Ar(quartz sand,Qs),Mnt-Ar(montmorillonite,Mnt)contaminants required higher temperature and activation energies for thermal desorption(201.95 kJ·mol^(-1)vs.127.82 kJ·mol^(-1))The above difference was generated since the adhesive forces between Ar and Mnt surfaces were greater than those between Ar and *** indicated by the analysis of the adhesion force sources,the van der Waals forces were responsible for facilitating oil adhesion to mineral surfaces,even though the electrostatic force prevented oil-mineral ***,the hydrophobic forces facilitated adhesion in 3 *** MD results demonstrated that compared with the Qs system,there existed larger binding energies between Ar and Mnt,a lower diffusion coefficient for Ar on the Mnt surface,as well as more significant adsorption of Ar on *** general,the different mineral species affect the strength of the interaction at the oil-soil interface,which is a guideline for proposing targeted oil-soil separation measures.

关键词： Oil-soil interface Thermal desorption Isothermal adsorption Extended-DLVO(EDLVO) Molecular dynamics

Attribute-Based Access Control Scheme with Efficient Revocation in Cloud Computing

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China Communications 2016年第7期13卷 92-99页

作者： Zhihua Xia Liangao Zhang dandan liu Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science & Technology School of Computer and Software Nanjing University of Information Science & Technology Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology Nanjing University of Information Science & Technology

Attribute-based encryption(ABE) supports the fine-grained sharing of encrypted *** some common designs,attributes are managed by an attribute authority that is supposed to be fully *** concept implies that the attribute authority can access all encrypted data,which is known as the key escrow *** addition,because all access privileges are defined over a single attribute universe and attributes are shared among multiple data users,the revocation of users is inefficient for the existing ABE *** this paper,we propose a novel scheme that solves the key escrow problem and supports efficient user ***,an access controller is introduced into the existing scheme,and then,secret keys are generated corporately by the attribute authority and access ***,an efficient user revocation mechanism is achieved using a version key that supports forward and backward *** analysis proves that our scheme is secure and efficient in user authorization and revocation.

关键词： access control ABE efficient revocation removing escrow cloud computing

Resource Allocation in High Energy-Efficient Cooperative Spectrum Sharing Communication Networks

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Chinese Journal of Electronics 2016年第4期25卷 768-773页

作者： liu dandan HUANG Cong WANG Wenbo GUO Wenbin National Satellite Meteorological Center School of Information and Communication Engineering Beijing University of Posts and Telecommunications

High energy-efficient wireless communication has become hot due to global low-carbon *** systems total transmitting power can be saved by resource allocation in cooperative spectrum sharing *** cooperative spectrum sharing,the secondary user relays the primary users traffic,as a return,the secondary user is admitted to access the licensed spectrum for its own data *** optimal power and time allocation are presented to minimize the overall energy consumption with the users service quality guaranteed in cooperative spectrum *** formulated it as a convex problem and achieve its optimal power and time allocation in closed *** analyze the performance of two different transmission protocols for the single relay channel.

关键词： High energy-efficiency Resource allocation Cooperative spectrum sharing Convex optimization

Facile Route to Enzyme Immobilization： Gloucose Oxidase Entrapped in Titania Under Mild Environmental Conditions and Consequent Electrochemical Sensor Response

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Chemical Research in Chinese Universities 2018年第3期34卷 490-494页

作者： YU Zhihui liu dandan LI Yunqiao Key Laboratory of Beijing on Regional Air Pollution Control College of Environmental and Energy Engineering Beijing University of Technology Beijing 100124 P. R. China National Institute of Metrology Beijing 100029 P. R. China

A facile one-step method to the immobilization of the combination of glucose oxidase（GOD） and catalase（CAT） in mesostructured TiO2 was proposed, The results obtained by transmission electron microspectroscopy and nitrogen adsorption-desorption analysis clearly show that the TiO2 mediated by the combination of GOD and CAT（CGC） has a large surface area and a narrow pore-size distribution. The CGC immobilized on mesostructured TiO2 exhibits direct electrochemistry and good electrocatalytic performance without any electron mediator.

关键词： Direct electrochemistry Glucose oxidase Immobilization

Effect of Cu-ZSM-5 catalysts with different CuO particle size on selective catalytic oxidation of N,N-Dimethylformamide

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Frontiers of Environmental Science & Engineering 2022年第10期16卷 1-10页

作者： Xin Xing Na Li dandan liu Jie Cheng Zhengping Hao College of Environmental Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China National Engineering Laboratory for VOCs Pollution Control Material&Technology Research Center for Environmental Material and Pollution Control TechnologyUniversity of Chinese Academy of SciencesBeijing 101408China

N,N-Dimethylformamide(DMF),a nitrogen-containing volatile organic compound(NVOC)with high emissions from the spray industry,has attracted increasing *** this study,Cu-ZSM-5 catalysts with different CuO particle sizes of 3,6,9 and 12 nm were synthesized and tested for DMF selective catalytic *** crystal structure and physicochemical properties of the catalyst were studied by various characterization *** catalytic activity increases with increasing CuO particle size,and complete conversion can be achieved at 300-350℃.The Cu-12 nm catalyst has the highest catalytic activity and can achieve complete conversion at 300℃.The Cu-6 nm sample has the highest N_(2)selectivity at lower temperatures,reaching 95%at 300℃.The activity of the catalysts is determined by the surface CuO cluster species,the bulk CuO species and the chemisorbed surface oxygen *** high N_(2)selectivity of the catalyst is attributed to the ratio of isolated Cu2+and bulk CuO species,and weak acidity is beneficial to the formation of N_(2).The results in this work will provide a new design of NVOC catalytic oxidation catalysts.

关键词： N,N-Dimethylformamide Selective catalytic oxidation Cu-ZSM-5 CuO particle size

Production of value-added peptides from agro-industrial residues by solid-state fermentation with a new thermophilic protease-producing strain

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Food Bioscience 2023年第3期53卷 526-534页

作者： dandan liu Yiting Guo Yolandani Haile Ma School of Food and Biological Engineering Jiangsu University301 Xuefu RoadZhenjiangJiangsu212013China Institute of Food Physical Processing Jiangsu University301 Xuefu RoadZhenjiangJiangsu212013China

This work aimed to explore an effective way for converting agro-industrial residues into value-added products.A thermophilic protease-producing strain was isolated from soybean meal(SBM)and identified as Bacillus licheniformis by 16S rDNA *** incubating Bacillus licheniformis CPB2 in casein medium for 24 h,the protease activity,peptide yield,and protein conversion rate of the culture could reach 8.87±0.33 U/mL,68.58%,and 82.27%,***’s spent grain(BSG)and SBM were used as co-substrates to produce value-added peptides through thermophilic solid-state fermentation(TSSF)with Bacillus licheniformis *** peptide content of the co-substrates increased from 25.71 mg/g to 112.72 mg/g under the optimal TSSF *** fermented products showed an increased crude protein and free amino acids contents and a decreased crude fat and ash contents as well as trypsin inhibitor activity compared with the unfermented *** could degrade macromolecular proteins into peptides,unfold the protein aggregates,and reduce the particle *** relevance:This work proposed an effective way for the rational and efficient utilization of wet and dry agro-industrial residues to produce value-added products,which showed a broad potential for reducing production costs,saving water resources and energy,and preserving the ecological environment.

关键词： Brewer’s spent grain Soybean meal Thermophilic protease-producing strain Thermophilic solid-state fermentation Value-added peptides

SZ-5 Cabin’s Height Changes during Three Super-storms in 2003

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空间科学学报 2019年第6期39卷 809-815页

作者： HUANG Cong liu dandan GUO Jing ZHANG Xiaoxin Key Laboratory of Space Weather National Satellite Meteorological CenterChina Meteorological AdministrationBeijing 100081 Beijing Aerospace Command and Control Center Beijing 100094

In this work,the daily height variations of SZ-5(Shenzhou-5) cabin from 22 October to 28 November in 2003 are analyzed,which includes the period of the Halloween Storm and the Great November *** significant orbital decays have been observed at the end of October and in late November due to the great solar flares and the severe geomagnetic *** to the equation of the air-drag-force on a spacecraft and the SZ-5 orbital decay information,the relative daily average thermospheric density changes during the three 2003 super-storms are derived and the results are compared with the Naval Research Laboratory Mass Spectrometer Incoherent Scatter Radar Extended Model(NRLMSISE-00).The results show that the daily average thermospheric density(at the altitude of SZ-5,about 350 km) in storm time enhances to approximately 200% as much as that in the quiet time but the empirical model may somewhat underestimate the average thermospheric density changes and the daily contributions of geomagnetic storms to the density enhancements during these severe space weather events.

关键词： Thermosphere density Orbital decay Geomagnetic storm Empirical model