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theoretical studies on the structures and reactivity of stannylenoids *** structures and isomerization of stannylenoid H_2SnLiF

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Chinese Journal of chemistry 1996年第4期14卷 310-314页

作者： QIU, Hua-Yu deng, cong-haoinstitute of theoretical chemistry, shandong university, jinan, shandong 250100, china Institute of theoretical chemistry Shandong University Jinan Shandong 250100 China

The structures of singlet stannylenoid H2SnLiF have been examined by ab initio MO theory. Four equilibrium states and three transition states of isomerization reaction are located. The calculation shows that the p-complex 1 is the most stable and experimentally detectable. The other three species, three-membered ring 2, o-complex 3 and tetrahedron 4, are also local minima on the potential energy surface, but are higher in energy.

关键词： Stannylenoid ab initio p-complex structure isomerization reaction

Gait Recognition Under Different Clothing Conditions Via Deterministic Learning

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IEEE/CAA Journal of Automatica Sinica 2024年第6期11卷 1530-1532页

作者： Muqing deng cong wang School of Automation Guangdong University of TechnologyGuangzhou 510006China School of Control Science and Engineering Shandong UniversityJinan 250100China

Dear Editor,This letter deals with the robustness problem of gait recognition method against maximum number of clothing *** selecting four kinds of time-varying silhouette features,gait dynamics underlying different individuals’gait features is effectively modeled by radial basis function(RBF)neural networks through deterministic *** kind of dynamics information has little sensitivity to the variance between gait patterns under different clothing *** order to eliminate the effect of clothing differences,the training patterns under different clothing conditions further constitute a uniform training dataset,containing all kinds of gait dynamics under different clothing conditions.A rapid recognition scheme is presented on published gait *** experiments demonstrate the efficacy of the proposed method.

关键词： networks neural individual

Sustainable Intensification and Large-scale Operation of Cultivated Land Use at the Farmers’ Scale:A Case Study of shandong Province,china

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Chinese Geographical Science 2024年第1期34卷 149-167页

作者： LI Li LYU Xiao ZHANG Anlu NIU shandong PENG Wenlong School of Public Administration Huazhong Agricultural UniversityWuhan430070China Department of Geography University of ZurichZurich8057Switzerland School of Humanities and Law Northeastern UniversityShenyang110169China School of Geography and Tourism Qufu Normal UniversityRizhao276800China

Sustainable intensification of cultivated land use(SICLU) and large-scale operations(LSO) are widely acknowledged strategies for enhancing agricultural ***,the existing literature has faced challenges in precisely defining SICLU and constructing comprehensive indicators,which has hindered the exploration of factors influencing LSO within the SICLU *** address this gap,we integrated self-efficacy theory into the design of an index framework for evaluating *** subsequently employed econometric models to analyze the significant factors that impact *** findings reveal that SICLU can be divided into four key dimensions:intensive management,efficient output,resource conservation,and ecological environment ***,it is crucial to incorporate belief-based cognitive factors into the index system,as farmers’ understanding of fertilizer and pesticide application significantly influences their willingness to engage in ***,we identify grain market turnover as the most influential factor in promoting LSO,with single-factor contribution rates reaching 70.9% for cultivated land transfer willingness and 62.5% for the total planting ***,unlike irrigation and agricultural machinery inputs,increased labor inputs correspond to larger planting areas for *** trend may be attributed to reduced labor availability because of rural labor migration,whereas the reduction in irrigation and agricultural input is contingent on innovations in production practices and the transfer of cultivated land management ***,SICLU dynamically influences LSO,with each index related to SICLU having an optimal range that fosters *** insights offer valuable guidance for policymakers,emphasizing farmers as their central focus,with the adjustment of input and output factors as a means to achieve LSO as the ultimate *** conclusion,we propose research avenues for further enriching the SICLU framework to ensur

关键词： sustainable intensification of cultivated land use(SICLU) self-efficacy status quo bias input and output Boosted Regression Tree willingness to transfer cultivated land cultivated land planting areas shandong,china

Nonadiabatic collision model calculations of ion-pair formation cross sections of Cs+O2→Cs++O2-

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Chinese Journal of chemistry 1995年第3期13卷 193-198页

作者： CAI, Zheng-Ting MU, Yu-Guang deng, cong-haoinstitute of theoretical chemistry, shandong university, jinan, shandong 250100, china Institute of theoretical chemistry Shandong University Jinan Shandong 250100 China

This paper has improved Hickman's nonadiabatic collision model by substituting Hickman's constant velocity classical straight line trajectory approximation with the solution of motion equation mR=-dV(R)/dR, and has calculated the cross sections of ion-pair formation Cs+O2 -Cs++O2- with the improved nonadiabatic collision model (INCM). A comparison of our results with other theoretical and experimental results has been made.

关键词： Ion-pair formation reaction nonadiabatic collision model two-state potential energy surface quantum scattering theory.

Nonvariational calculation of eigenenergies for ~3S states of helium-like systems

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Chinese Science Bulletin 1997年第4期42卷 301-304页

作者： wang yixuan and deng conghaoinstitute of theoretical chemistry, shandong university, jinan 250100, china Institute of theoretical chemistry Shandong University Jinan China

COMPARED with the popular hyperspherical coordinate scheme, the HHGLF method proposed by deng and others has the advantages of rapid hyperradial convergence, analytical solution and huge basis set calculation. However, the problem of slow convergence in the hyperangle part still exists as other hyperspherical harmonics (HH) methods do. To solve the prob-

关键词： hyperspherical coordinates 3S excited states nonvariational calculation helium-like systems.

THE ISOMERIC STRUCTURES OF H_2SnLiF,THE PROTOTYPE STANNYLENOID

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Chinese Chemical Letters 1996年第6期7卷 569-570页

作者： Hua Yu QIU and cong Hao deng(theoretical chemistry Group, shandong university, jinan 250100) shandong UNIV THEORET CHEM GRPJINAN 250100PEOPLES R CHINA

The structures of four isomeric forms of the medel stannylenoid, H2SnLiF, havebeen examined by ah initio MO theory. The most stable structure is suggested to be the p-complex 1. The other three species, three-membered ring 2,a-complex 3 and tetranedron 4, are also local minima on the potential energy surface, but are higher in energy

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theoretical studies on Lewis acidity scale and bonding character of boron trihalides BX_3(X=F, Cl, Br, I) by DV-X_α quantum chemical approach

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Chinese Journal of chemistry 1997年第1期15卷 17-20页

作者： CAI, Zheng-Ting LI, Ci-Rant ZHANG, Rui-Qin deng, cong-haoinstitute of theoretical Chemstry, Department of chemistry, Department of Physics shandong university, jinan, shandong 250100, china Institute of theoretical chemistry Jinan Shandong 250100 China Department of chemistry shandong university Jinan Shandong 250100 China Department of Physics shandong university Jinan Shandong 250100 China [*]Institute of theoretical chemistry Jinan Shandong 250100 China

The Lewis acidity scale of boron trihalides BX3 (X=F, Cl, Br, I) and character of the boron-halogen bonds have been studied by means of DV-Xa approach. Present results show that the acid strength of boron trihalides i... 详细信息

关键词： Lewis acidity scale boron trihalides valence of boron DV-Xα quantum chemical approach

Development and evaluation of an online monitoring single-particle optical particle counter with polarization detection

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Journal of Environmental Sciences 2024年第4期138卷 585-596页

作者： Weijie Yao Xiaole Pan Yu Tian Hang Liu Yuting Zhang shandong Lei Junbo Zhang yinzhou Zhang LinWu Yele Sun Zifa wang State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China

We developed a single-particle optical particle counter with polarization detection(SOPC)for the real-time measurement of the optical size and depolarization ratio(defined as the ratio of the vertical component to the parallel component of backward scattering)of atmospheric particles,the polarization ratio(DR)value can reflect the irregularity of the *** SOPC can detect aerosol particles with size larger than 500 nm and the maximum particle count rate reaches~1.8×10^(5)particles per *** SOPC uses a modulated polarization laser to measure the optical size of particles according to forward scattering signal and the DR value of the particles by backward S and P signal *** sampling rate of the SOPC was 106#/(sec·channel),and all the raw data were processed *** calibration curve was obtained by polystyrene latex spheres with sizes of 0.5-10μm,and the average relative deviation of measurement was 3.96% for sub 3μm particles.T-matrix method calculations showed that the DR value of backscatter light at 120°could describe the variations in the aspect ratio of particles in the above size *** performed insitu observations for the evaluation of the SOPC,the mass concentration constructed by the SOPC showed good agreement with the PM_(2.5)measurements in a nearby state-controlled monitoring *** instrument could provide useful data for source appointment and regulations against air pollution.

关键词： Instrument development Single particle detection Measurement uncertainty Optical simulation Mass concentration

Structures and isomerization of cabenoids H_2CLiBr

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Chinese Science Bulletin 1997年第3期42卷 207-210页

作者： QIU Huayu and deng conghaotheoretical chemistry Group, shandong university, jinan 250100, china theoretical chemistry Group Shandong University Jinan China

ALTHOLIGH carbenoids as the active organometallic intermediates have been widely used in organic syntheses, up to now, only few simple saturated and unsaturated carbenoids, such as H2CLiF, Cl3CLi, HCLiF2 and HCCLiF, h... 详细信息

关键词： ab initio carbenoid three-membered ring isomerization.