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Multidisciplinary Design Optimization with a New Effective Method

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Chinese Journal of Mechanical Engineering 2010年第4期23卷 505-510页

作者： CHEN xiaokai li Bangguo liN Yi National Engineering Laboratory of Electric Vehicle Beijing Institute of Technology Beijing 100081 China

Collaborative optimization （CO） is one of the most widely used methods in multidisciplinary design optimization （MDO）, which is an effective methodology to solve modem complex engineering problems. CO consists of two-level optimization problems which are system optimization problem and subspace optimization problem. The architecture of CO can reserve the autonomy of individual disciplines in maximum, while providing a mechanism for coordinating design problem. However, CO has low computation efficiency and is easy to diverge. For the purpose of solving these problems, the former improved methods were studied. The relaxation factors were used to change the system consistency constraints to inequality constraints, or the response surface estimation was used to surrogate the system consistency constraints. However, these methods didn＇t avoid the computational difficulties very well, furthermore, some new problems arose. The concept of optimum constraint sensitivity was proposed, and the quadratic constraints in system level were reformed. Hence, a new collaborative optimization was developed, which is called system level dynamic constraint collaborative optimization （DCCO）. The novel method is able to increase the exchange of information between system level and disciplinary level. The optimization results of each disciplinary optimization can be feedback to system level with the optimum constraint sensitivity. On the basis of the information, the new system level linear dynamic constraints can be constructed; it is better to reflect the effect of disciplinary level optimizations. The system level optimizer can clearly capture the boundary where disciplinary objective functions become zero, and considerably enhance the convergence. Two standard MDO examples were conducted to verify the feasibility and effectiveness of DCCO. The results show that DCCO can save the solving time, and is much better in terms of convergence and robustness, hence, the new method is more effi

关键词： multidisciplinary design optimization (MDO) collaborative optimization (CO) dynamic constraint

Honeycomb-patterned films of polystyrene/poly(ethylene glycol): Preparation, surface aggregation and protein adsorption

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Science China Chemistry 2009年第7期52卷 969-974页

作者： WAN lingShu KE BeiBei li xiaokai MENG Xianglin ZHANG LuYao XU ZhiKang Key Laboratory of Macromolecular Synthesis and Functionalization of Ministry of Education Institute of Polymer Science and State Key Laboratory of Chemical EngineeringZhejiang UniversityHangzhou 310027China

Highly ordered honeycomb-patterned polystyrene (PS)/poly(ethylene glycol) (PEG) films were prepared by a water-assisted method using an improved setup, which facilitated the formation of films with higher regularity, better reproducibility, and larger area of honeycomb structures. Surface aggregation of hydrophilic PEG and adsorption of bovine serum albumin (BSA) on the honeycomb-patterned films were investigated. Field emission scanning electron microscopy (FESEM) and atomic force microscopy (AFM) were used to observe the surface morphologies of the films before and after being rinsed with water. As confirmed by the FESEM images and the AFM phase images, PEG was enriched in the pores and could be gradually removed by water. The adsorption of fluorescence-labeled BSA on the films was studied in visual form using laser scanning confocal microscopy. Results clearly demonstrated that the protein-resistant PEG was selectively enriched in the pores. This water-assisted method may be a latent tool to prepare honeycomb-patterned biofunctional surfaces.

关键词： honeycomb-patterned film water-assisted method polystyrene poly(ethylene glycol) surface aggregation

Coulomb focusing in attosecond angular streaking

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light(Science & Applications) 2024年第11期13卷 2611-2619页

作者： xiaokai li Xiwang liu Chuncheng Wang Shuai Ben Shengpeng Zhou Yizhang Yang Xiaohong Song Jing Chen Weifeng Yang Dajun Ding Institute of Atomic and Molecular Physics and Advanced Light Field and Modern Medical Treatment Science and Technology Innovation Center of Jilin ProvinceJilin UniversityChangchun 130012China School of Physics and Optoelectronic Engineering Hainan UniversityHaikou 570228China Hefei National Laboratory and Hefei National Research Center for Physical Sciences at the Microscale and School of Physical SciencesUniversity of Science and Technology of ChinaHefei 230026China Center for Theoretical Physics Hainan UniversityHaikou 570228China

Angular streaking technique employs a close-to-circularly polarized laser pulse to build a mapping between the instant of maximum ionization and the most probable emission angle in the photoelectron momentum distribution,thereby enabling the probe of laser-induced electron dynamics in atoms and molecules with attosecond temporal ***,through the jointed experimental observations and improved Coulombcorrected strong-field approximation statistical simulations,we identify that electrons emitted at different initial ionization times converge to the most probable emission angle due to the previously-unexpected Coulomb focusing triggered by the nonadiabatic laser-induced electron *** reveal that the Coulomb focusing induces the observed nonintuitive energy-dependent trend in the angular streaking measurements on the nonadiabatic tunneling,and that tunneling dynamics under the classically forbidden barrier can leave fingerprints on the resulting *** findings have significant implications for the decoding of the intricate tunneling dynamics with attosecond angular streaking.

关键词： angular tunneling thereby

Ultrafast Coulomb explosion imaging of molecules and molecular clusters

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Chinese Physics B 2022年第10期31卷 8-22页

作者： xiaokai li Xitao Yu Pan Ma Xinning Zhao Chuncheng Wang Sizuo Luo Dajun Ding Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China

Taking an image of their structure and a movie of their dynamics of small quantum systems have always been a dream of physicists and chemists. Laser-induced Coulomb explosion imaging(CEI) provides a great opportunity to make this dream a reality for small molecules or their aggregation — clusters. The method is unique for identifying the atomic locations with angstrom spatial resolution and capturing the structural evolution with a femtosecond time scale, in particular for imaging transient state products. This review summarizes the determination of three-dimensional equilibrium geometry of molecules and molecular cluster system through the reconstruction from the fragments momenta, and also shows that the dissociation dynamics on the complex potential energy surface can be tracked in real-time with the ultrafast CEI(UCEI).Furthermore, the detailed measurement and analysis procedures of the CEI, theoretical methods, exemplary results, and future perspectives of the technique are described.

关键词： Coulomb explosion imaging molecular structure molecular cluster ultrafast dissociation dynamics

Genome-wide association study revealed genetic variations of ABA sensitivity controlled by multiple stress-related genes in rice

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Stress Biology 2021年第1期1卷 120-131页

作者： Lei Peng Tingting Xie Zilong Guo xiaokai li Yu Chang Haifu Tu Shengchang Wang Nai Wu Yilong Yao lizhong Xiong National Key Laboratory of Crop Genetic Improvement Hubei Hongshan LaboratoryHuazhong Agricultural UniversityWuhan 430070China

Abscisic acid(ABA)is a critical phytohormone that regulates multiple physiological processes including plant growth and stress *** core ABA signaling pathway has been well established,but genetic variations mediating ABA responses remain largely *** this study,we performed genome-wide association study(GWAS)to identify loci and genes associated with ABA sensitivity(reflected by seed germination inhibition by ABA)in a panel of 425 rice *** seed germination assay revealed that Aus and indica rice had stronger ABA sensitivity than japonica rice.A total of 48 non-redundant association loci were detected in the indica subpopulation and whole population,and 386 genes in these loci were responsive to ABA or abiotic *** association loci were overlapped with previously reported loci for yield under drought stress or for droughtindicative image *** analyses of important candidate genes such as OsSAPK6,a key component in the ABA signaling core,were performed to identify key SNPs/InDels that may affect gene functions through promoter activity regulation,amino acid variation,or gene *** results provide insights into the genetic basis of ABA sensitivity related to stress responses.

关键词： ABA sensitivity Seed germination Stress response Rice

Control of rice ratooning ability by a nucleoredoxin that inhibits histidine kinase dimerization to attenuate cytokinin signaling in axillary buds

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Molecular Plant 2023年第12期16卷 1911-1926页

作者： Yilong Yao Denghao Xiang Nai Wu Yao Wang Yu Chen Yang Yuan Ying Ye Dan Hu Chang Zheng Yu Yan Qingya Lv xiaokai li Guoxing Chen Honghong Hu Haiyan Xiong Shaobing Peng lizhong Xiong National Key Laboratory of Crop Genetic Improvement Hubei Hongshan Laboratoryand National Center of Plant Gene Research(Wuhan)Huazhong Agricultural UniversityWuhan430070China

Rice ratooning,the fast outgrowth of dormant buds on stubble,is an important cropping practice in rice ***,the low ratooning ability(RA)of most rice varieties restricts the application of this cost-efficient system,and the genetic basis of RA remains *** this study,we dissected the genetic architecture of RA by a genome-wide association study in a natural rice *** ratooning ability 3(RRA3),encoding a hitherto not characterized nucleoredoxin involved in reduction of disulfide bonds,was identified as the causal gene of a major locus controlling *** of RRA3 in rice significantly accelerated leaf senescence and reduced RA,whereas knockout of RRA3 significantly delayed leaf senescence and increased RA and ratoon *** demonstrated that RRA3 interacts with Oryza sativa histidine kinase 4(OHK4),a cytokinin receptor,and inhibits the dimerization of OHK4 through disulfide bond *** inhibition ultimately led to decreased cytokinin signaling and reduced *** addition,variations in the RRA3 promoter were identified to be associated with *** of a superior haplotype with weak expression of RRA3 into the elite rice variety Guichao 2 significantly increased RA and ratoon yield by 23.8%.Collectively,this study not only uncovers an undocumented regulatory mechanism of cytokinin signaling through de-dimerization of a histidine kinase receptor-but also provides an eximious gene with promising value for ratoon rice breeding.

关键词： ratoon rice ratooning ability redox histidine kinase cytokinin signaling

Measuring Charge Distribution of Molecular Cations by an Atomic Coulomb Probe Microscope

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Chinese Physics Letters 2022年第11期39卷 12-17页

作者： Xitao Yu Xiaoqing Hu Jiaqi Zhou Xinyu Zhang Xinning Zhao Shaokui Jia Xiaorui Xue Dianxiang Ren xiaokai li Yong Wu Xueguang Ren Sizuo Luo Dajun Ding Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China Institute of Applied Physics and Computational Mathematics Beijing 100088China School of Physics Xi'an Jiaotong UniversityXi'an 710049China

Imaging the charge distributions and structures of molecules and clusters will promote the understanding of the dynamics of the quantum ***,we report a method by using an Ar atom as a tip to probe the charge distributions of benzene(Bz)cations in gas ***,the measured charge distributions of Bz^(+)(δ_(H)=0.204,δ_(C)=-0.037)and Bz^(2+)(δ_(H)=0.248,δ_(C)=0.0853)agree well with the calculated Mulliken distributions,and the structures of Bz2 is reconstructed by using the measured charge *** structures of two Bz2isomers(T-shaped and PD isomers)can be resolved from the measured inter-molecular potential V(R)between two Bz ions,and the structures of Bz dimer agree well with the theoretical predictions.

关键词： isomers charge Probe

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钽铌酸钾晶体的电控偏转色散特性

光学学报 2020年第8期40卷 165-170页

作者：李小凯宋丽培刘伟伟南开大学现代光学研究所天津300350 天津市微尺度光学信息技术科学重点实验室天津300350

钽铌酸钾(KTN)晶体具有很高的二次电光系数,响应速度快,因此可以作为高速电光开关的材料,能在较低电压下快速产生大的光束偏转角。但是KTN晶体的色散问题制约了其作为电光开关在宽光谱范围内的应用。探讨了外加电压、温度及波长对偏转... 详细信息

钽铌酸钾(KTN)晶体具有很高的二次电光系数,响应速度快,因此可以作为高速电光开关的材料,能在较低电压下快速产生大的光束偏转角。但是KTN晶体的色散问题制约了其作为电光开关在宽光谱范围内的应用。探讨了外加电压、温度及波长对偏转特性的影响,发现同时调节电压和温度的方法可以平衡光束偏转角和色散,为KTN晶体用于宽波段光束偏转提供参考。

关键词：物理光学钽铌酸钾晶体电光开关光束偏转色散

Effect of Y_(2)O_(3 )Addition on Preparation and Properties of β-SiAlON Reticular Porous Ceramic Filters

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China's Refractories 2022年第4期31卷 28-33页

作者： GAO Jinxing XU lingling li liya MU Jinghua li xiaokai XU Enxia GUO Donghui MENG Dekang ZHOU Gaofeng CHEN Shoujie School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450052China Henan Xuantong New Materials Technology Co. Ltd.Zhengzhou 450000China Henan Tongyu Metallurgy Materials Group Co. Ltd.Nanyang 473000China

β-Si Al ON reticular porous ceramics(Si_(6-Z)Al_(Z)O_(Z)N_(8-Z),Z=2)were prepared withα-Al_(2)O_(3),AlN and Si as raw materials and Y_(2)O_(3)as the sintering aid by the foam impregnation *** influence of the Y_(2)O_(3)addition(0,3%,6%and 9%,by mass)on the microstructure and the properties of the samples was *** results show that the Y_(2)O_(3)addition is conductive to the sintering of samples and the growth of *** sample added with 6%Y_(2)O_(3)has the optimal properties:the apparent porosity of 82.9%,the bulk density of 0.53 g·cm^(-3),the cold compressive strength of 1.97 MPa,and the residual cold compressive strength of 1.68 MPa after oxidation,which can be used as porous ceramic filters.

关键词： porous ceramics β-SiAlON yttrium oxide foam impregnation method