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Highly stable and efficient perovskite solar cells produced via high-boiling point solvents and additive engineering synergistically

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Science China Chemistry 2020年第6期63卷 818-826页

作者： Qingbo Wei Zhangwen Ye Xiaodong Ren Feng Fu Zhou yang Shengzhong(Frank)Liu dong yang Key Laboratory of Applied Surface and Colloid Chemistry of the Ministry of Education Shaanxi Engineering Lab for Advanced Energy TechnologySchool of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi'an 710062China Key Laboratory of Chemical Reaction Engineering of Shaanxi Province College of Chemistry&Chemical EngineeringYan'an UniversityYan'an 716000China Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Materials Science and Engineering Penn StateUniversity ParkPA16802USA

The active absorber layer plays a crucial role in a perovskite solar ***,we used high boiling pointγ-butyrolactone(GBL)as the main solvent,Pb(SCN)2 and dimethyl sulfoxide(DMSO)as an effective additive in the FA0.83MA0.17Cs0.05PbI(3-x)Brx solution to improve the quality of perovskite *** GBL will delay the crystallization speed of the perovskite,and lead to the grain growth assisted by *** synergistic effect of the solvent engineering and additive engineering is beneficial to the slow growth of the grain *** is found that the addition of Pb(SCN)2 increases Gibbs free energy barrier for the nucleation,leading to the formation of fewer nuclei,which results in a high quality of perovskite absorbers with larger grains and smoother *** synergistic effect of solvents and Pb(SCN)2 on the morphology and photovoltaic performances is *** to devices without the additive,the efficiency of devices with 5%Pb(SCN)2-doped FA0.83MA0.17Cs0.05PbI(3-x)Brx is raised to 19.01%from 15.21%.We believe this breakthrough regarding high efficiency perovskite solar cells will help for their transitions.

关键词： perovskite additive crystallinity grain size efficiency

Study on the Perturbation Characteristics of Two-Channel Laser Propagation in Atmospheric Turbulence

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Communications in Theoretical Physics 2019年第6期71卷 731-735页

作者： Xiao-dong yang Ming Gao School of Optoelectronic Engineering Xi’an Technological University

In order to study the influence factors of acquisition detection target information by lidar and understand the influence degree of each factor, the two-channel phase perturbation model and the two-channel eikonal variance model are derived in detail by using the geometrical optics method in this paper, and each factor is discussed in detail. The results show that the transmission distance is the main factor to affect the two-channel perturbation. With the increase of the transmission distance, the disturbing degree will gradually weaken. With the increase of transverse coordinates,the disturbing of two channels will also be weakened. In order to further weaken the disturbing degree, the feature dimension should be far larger than the wavelength, but far less than the transmission distance.

关键词： atmospheric turbulence two-channel phase perturbation eikonal variance

Whole genome re-sequencing reveals evolutionary patterns of sacred lotus (Nelumbo nucifera)

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Journal of Integrative Plant Biology 2018年第1期60卷 2-15页

作者： Longyu Huang Mei yang Ling Li Hui Li dong yang Tao Shi Pingfang yang Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture Wuhan Botanical Garden of Chinese Academy of SciencesWuhan 43oo74 China University of Chinese Academy of Sciences Beijing 100049 China Sino-African Joint Research Center Chinese Academy of Sciences Wuhan 430074 China Hubei Collaborative Innovation Center for Grain Industry Jingzhou 434025 China

Sacred lotus(Nelumbo nucifera or lotus) is an important aquatic plant in horticulture and ecosystems. As a foundation for exploring genomic variation and evolution among different germplasms, we re-sequenced 19 individuals from three cultivated temperate lotus subgroups(rhizome,seed and flower lotus), one wild temperate lotus subgroup(wild lotus), one tropical lotus group(Thai lotus) and an outgroup(Nelumbo lutea). Through genetic diversity and polymorphism analysis by non-missing SNP sites widely distributed in the whole genome, we confirmed that wild and Thai lotus exhibited greater differentiation with a higher genomic diversity compared to cultivated lotus. Rhizome lotus had the lowest genomic diversity and a closer relationship to wild lotus, whereas the genomes of seed and flower lotus were admixed. Genes in energy metabolism process and plant immunity evolved rapidly in lotus, reflecting local *** established that candidate genes in genomic regions with significant differentiation associated with temperate and tropical lotus divergence always exhibited highly divergent expression pattern. Together, this study comprehensive and credible interpretates important patterns of genetic diversity and relationships, gene evolution, and genomic signature from ecotypic differentiation of sacred lotus.

关键词： Nelumbo nucifera Whole genome re-sequencing reveals evolutionary patterns of sacred lotus Figure

Bleeding of two lumbar arteries caused by one puncture following percutaneous nephrolithotomy:A case report

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World Journal of Clinical Cases 2020年第22期8卷 5790-5794页

作者： Qian Liu Chuan yang Kai Lin dong yang Tumor and Interventional Radiology Hanchuan People’s HospitalHanchuan 432300Hubei ProvinceChina Urology Hanchuan People’s HospitalHanchuan 432300Hubei ProvinceChina Interventional Radiology Hanchuan People’s HospitalHanchuan 432300Hubei ProvinceChina

BACKGROUND Lumbar artery bleeding is an uncommon complication of percutaneous nephrolithotomy(PCNL).This report presents a rare complication where two lumbar arteries were injured by a single puncture following *** scarce reports of this complication have been *** SUMMARY A 24-year-old man presented with a 2.2 cm right renal calculus,which was managed by *** nephrostomy tube removal on the 6th postoperative day,intense bleeding was observed in the fistula and the *** angiography was undertaken immediately;however,an initial selective renal angiogram revealed no evidence of renal vascular *** of these injuries involved a pseudoaneurysm from a peripheral branch in the first right lumbar artery,while the other involved an arteriovenous fistula from a peripheral branch in the second right lumbar ***,coil embolization was performed *** This case is being reported to inform clinicians that lumbar artery damage is one of the causes of severe bleeding after PCNL and could involve damage of more than one artery.

关键词： Percutaneous nephrolithotomy Lumbar artery Pseudoaneurysm Arteriovenous fistula Embolization Case report

Control allocation for aircraft with input constraints based on improved cuckoo search algorithm

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Defence Technology（防务技术） 2017年第1期13卷 1-5页

作者： Yao LU Chao-yang dong Qing WANG School of Aeronautic Science and Engineering BUAABeijing 100191China School of Automation Science and Electrical Engineering BUAABeijing 100191China

The control allocation problem of aircraft whose control inputs contain integer constraints is investigated. The control allocation problem is described as an integer programming problem and solved by the cuckoo search algorithm. In order to enhance the search capability of the cuckoo search algorithm, the adaptive detection probability and amplification factor are designed. Finally, the control allocation method based on the proposed improved cuckoo search algorithm is applied to the tracking control problem of the innovative control effector aircraft. The comparative simulation results demonstrate the superiority and effectiveness of the proposed improved cuckoo search algorithm in control allocation of aircraft.

关键词： Control allocation Optimization Cuckoo search algorithm Innovative control effector aircraft Tracking

Realizing high thermoelectric properties in p-type polycrystalline SnSe by inducing DOS distortion

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Rare Metals 2021年第10期40卷 2819-2828页

作者： Yu-Ping Wang Bing-Chao Qin dong-yang Wang Tao Hong Xiang Gao Li-dong Zhao School of Materials Science and Engineering Beihang UniversityBeijing 100191China Center for High Pressure Science and Technology Advanced Research(HPSTAR) Beijing 100094China

SnSe crystals have been discovered as one of the most efficient thermoelectric materials due to their remarkable thermal and electrical transports. But the polycrystalline SnSe possesses much lower performance especially for the low carrier mobility and electrical conductivity. We firstly attempted to explain and verify the difference in the electrical conductivity as a function of temperature between p-type crystalline and polycrystalline SnSe by considering the grain boundary effects in the polycrystalline samples. On the basis of 2% Na doping to optimize the carrier concentration, the carrier mobility is improved by further introducing In, leading to enhanced carrier mobility from 3 to 9 cm2·V^(-1)·s^(-1) in polycrystalline SnSe. Moreover, In doping introduces extra resonant levels in SnSe, which increases the density of states near Fermi level and leads to an enhanced band effective mass. Large Seebeck coefficient of ~205 l V·K^(-1) at 300 K and maximum power factor of ~7.5 l W·cm^(-1)·K^(-2) at 773 K can be obtained in the Sn_(0.975)Na_(0.02)In_(0.005) Se sample,leading to a competitively high dimensionless figure of merit(ZT) value exceeding 1.1 at 773 K.

关键词： Thermoelectric p-type polycrystalline SnSe Carrier mobility Resonant effect Band effective mass

Perturbations of Frames

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Acta Mathematica Sinica,English Series 2014年第7期30卷 1089-1108页

作者： dong yang CHEN Lei Li Ben Tuo ZHENG School of Mathematical Sciences Xiamen University School of Mathematical Sciences and LPMC Nankai University Department of Mathematics University of MemphisMemphisTN 38152-3240USA

In this paper, we give some sufficient conditions under which perturbations preserve Hilbert frames and near-Riesz bases. Similar results are also extended to frame sequences, Riesz sequences and Schauder frames. It is worth mentioning that some of our perturbation conditions are quite different from those used in the previous literatures on this topic.

关键词： Hilbert frames near-Riesz basis Schauder frames perturbation

Influence of particle contact models on soil response of poorly graded sand during cavity expansion in discrete element simulation

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第6期10卷 1154-1170页

作者： yang dong Behzad Fatahi Hadi Khabbaz Henry Zhang School of Civil and Environmental Engineering University of Technology Sydney (UTS) WSP in Australia & New Zealand Sydney Office

The discrete element method(DEM) has been extensively adopted to investigate many complex geotechnical related problems due to its capability to incorporate the discontinuous nature of granular materials. In particular, when simulating large deformations or distortion of soil(e.g. cavity expansion),DEM can be very effective as other numerical solutions may experience convergence problems. Cavity expansion theory has widespread applications in geotechnical engineering, particularly to the problems concerning in situ testing, pile installation and so forth. In addition, the behaviour of geomaterials in a macro-level is utterly determined by microscopic properties, highlighting the importance of contact models. Despite the fact that there are numerous contact models proposed to mimic the realistic behaviour of granular materials, there are lack of studies on the effects of these contact models on the soil ***, in this study, a series of three-dimensional numerical simulations with different contact constitutive models was conducted to simulate the response of sandy soils during cylindrical cavity expansion. In this numerical investigation, three contact models, i.e. linear contact model, rolling resistance contact model,and Hertz contact model, are considered. It should be noted that the former two models are linear based models, providing linearly elastic and frictional plasticity behaviours, whereas the latter one consists of nonlinear formulation based on an approximation of the theory of Mindlin and Deresiewicz. To examine the effects of these contact models, several cylindrical cavities were created and expanded gradually from an initial radius of 0.055 m to a final radius of 0.1 m. The numerical predictions confirm that the calibrated contact models produced similar results regarding the variations of cavity pressure, radial stress, deviatoric stress, volumetric strain, as well as the soil radial displacement. However, the linear contact model may resu

关键词： Discrete element method(DEM) Cavity expansion Contact models Behaviour of geomaterials

A General Law of Precise Asymptotics for Products of Sums under Dependence

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Acta Mathematica Sinica,English Series 2010年第1期26卷 107-116页

作者： Yong ZHANG Xiao Yun yang Zhi Shan dong College of Mathematics Jilin University Changchun 130012 P. R. China

Let {Xn,n ≥ 1} be a strictly stationary LNQD （LPQD） sequence of positive random variables with EX1 = μ 〉 0, and VarX1 = σ^2 〈 ∞. Denote by Sn = ∑i=1^n Xi and γ = σ/μ the coefficients of variation. In this paper, under some suitable conditions, we show that a general law of precise asymptotics for products of sums holds. It can describe the relations among the boundary function, weighted function, convergence rate and limit value in the study of complete convergence.

关键词： general law precise asymptotics products of sums NA (PA) LNQD (LPQD)