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| 1 | Survey of convex optimization for aerospace applications显示文摘Convex optimization is a class of mathematical programming problems with polynomial complexity for which state-of-the-art, highly efficient numerical algorithms with predeterminable computational bounds exist. Computational efficiency and tractability in aerospace engineering, especially in guidance, navigation, and control (GN&C), are of paramount importance. With theoretical guarantees on solutions and computational efficiency, convex optimization lends itself as a very appealing tool. Coinciding the strong drive toward autonomous operations of aerospace vehicles, convex optimization has seen rapidly increasing utility in solving aerospace GN&C problems with the potential for onboard real-time applications. This paper attempts to provide an overview on the problems to date in aerospace guidance, path planning, and control where convex optimization has been applied. Various convexification techniques are reviewed that have been used to convexify the originally nonconvex aerospace problems. Discussions on how to ensure the validity of the convexification process are provided. Some related implementation issues will be introduced as well. | Xinfu Liu Ping Lu Binfeng Pan | 2017 | Astrodynamics2017，1，1： | 32 |
| 2 | Use of Double Differential-mode Current Injection Method Equivalent to High Level Illumination for Susceptibility Testing显示文摘To achieve the electric field strength and the induced currents in equivalence in susceptibility tests with the high-level field radiation above 400 MHz,a double differential-mode(DM) current injection method based on directional couplers is proposed.Two cascaded symmetrical directional couplers compose a coupling device to inject the DM currents.When the coupling device is used,two devices are necessary to achieve the equivalence between radiation and injection,i.e.the equivalence between the injected voltages and the field strength,which is linear,regardless of the characteristics of the equipment under test(EUT).The results are verified by experiments using typical coaxial cables and nonlinear devices,where the equivalence between the nonlinear EUT responses induced by radiation and injection at both ends is achieved by using two coupling devices.At a frequency up to 1.75 GHz,the maximal experimental error is only 3.39%.The experimental results confirm the accuracy of the proposed method even both the EUTs work in the nonlinear region.The proposed method is applicable for radiated susceptibility(RS) testing of interconnected systems in the microwave frequency band. | LU Xinfu WEI Guanghui PAN Xiaodong | 2013 | 高电压技术2013，39，10： | 3 |
| 3 | Research on the Equivalence Between Double Differential- mode Current Injection and Radiation Test Method显示文摘There are the application scope limits for single differential-mode current injection test method, so in order to carry out injection susceptibility test for two-pieces equipment interconnected with both ends of a cable simultaneously, a double differential-mode current in- jection test method (DDMCI) is proposed. The method adopted the equivalence source wave theorem and Baum-Liu-Tesche(BLT) equation as its theory foundation. The equivalent corresponding relation between injection voltage and radiation electric field intensity is derived, and the phase relation between the two injection voltage sources is confirmed. The results indicate that the amplitude and phase of the equivalent injection voltage source is closely related to the S parameter of directional coupling device, the transmission line length, and the source vector in BLT equation, but has nothing to do with the reflection coefficient between the two equipment pieces. Therefore, by choosing the right amplitude and phase of the double injection voltage sources, the DDMCI test is equivalent to the radiation test for two interconnected equipment of a system. | PAN Xiaodong WEI Guanghui FAN Lisi LU Xinfu YANG Zhe | 2013 | 高电压技术2013，39，8： | 1 |
| 4 | Development of a target capture sequencing SNP genotyping platform for genetic analysis and genomic breeding in rapeseed显示文摘Rapeseed(Brassica napus)is an oil crop grown worldwide,making it a key plant species in molecular breeding research.However,the complexity of its polyploid genome increases sequencing costs and reduces sequencing accuracy.Target capture coupled with high-throughput sequencing is an efficient approach for detecting genetic variation at genomic regions or loci of interest.In this study,588 resequenced accessions of rapeseed were used to develop a target capture sequencing SNP genotyping platform named BnaPan50T.The platform comprised 54,765,with 54,058 resequenced markers from the pan-genome,and 855 variant trait-associated markers for 12 agronomic traits.The capture quality of BnaPan50T was demonstrated well in 12 typical accessions.Compared with a conventional genotyping array,BnaPan50T has a high SNP density and a high proportion of SNPs in unique physical positions and in annotated functional genes,promising wide application.Target capture sequencing and wholegenome resequencing in 90 doubled-haploid lines yielded 60%specificity,78%uniformity within tenfold coverage range,and 93%genotyping accuracy for the platform.BnaPan50T was used to construct a genetic map for quantitative trait loci(QTL)mapping,identify 21 unique QTL,and predict several candidate genes for yield-related traits in multiple environments.A set of 132 core SNP loci was selected from BnaPan50T to construct DNA fingerprints and germplasm identification resources.This study provides genomics resources to support target capture sequencing,genetic analysis and genomic breeding of rapeseed. | Xiaodong Li Xumei Liu Yonghai Fan Shengting Li Mengna Yu Mingchao Qian Yuling Chen Hongqiao Chen Xinchun Li Bei Liu Xinfu Xu Cunmin Qu Jiana Li Kun Lu | 2023 | The Crop Journal2023，11，2： | 1 |
| 5 | BnbHLH92a negatively regulates anthocyanin and proanthocyanidin biosynthesis in Brassica napus显示文摘Yellow seed trait is a desirable characteristic with potential for increasing seed quality and commercial value in rapeseed,and anthocyanin and proanthocyanidins(PAs)are major seed-coat pigments.Few transcription factors involved in the regulation of anthocyanin and PAs biosynthesis have been characterized in rapeseed.In this study,we identified a transcription factor gene BnbHLH92a(BnaA06T0441000ZS)in rapeseed.Overexpressing BnbHLH92a both in Arabidopsis and in rapeseed reduced levels of anthocyanin and PAs.Correspondingly,the expression profiles of anthocyanin and PA biosynthesis genes(TT3,BAN,TT8,TT18,and TTG1)were shown by quantitative real-time PCR to be inhibited in BnbHLH92a-overexpressing Arabidopsis seeds,indicating that BnbHLH92a represses the anthocyanin and PA biosynthesis pathway in Arabidopsis.BnbHLH92a physically interacts with the BnTTG1 protein and represses the biosynthesis of anthocyanins and PAs in rapeseed.BnbHLH92a also binds directly to the BnTT18 promoter and represses its expression.These results suggest that BnbHLH92a is a novel upstream regulator of flavonoid biosynthesis in B.napus. | Ran Hu Meichen Zhu Si Chen Chengxiang Li Qianwei Zhang Lei Gao Xueqin Liu Shulin Shen Fuyou Fu Xinfu Xu Ying Liang Liezhao Liu Kun Lu Hao Yu Jiana Li Cunmin Qu | 2023 | The Crop Journal2023，11，2： | 0 |
| 6 | Assessing chromatin condensation for epigenetics with a DNA-targeting sensor by FRET and FLIM techniques显示文摘Here we propose a fluorescent sensor,Chroma-V,consisted of a Hoechst ligand(Hoe) to target chromatin DNA and a BODIPY rotor(BDP) to sense the local viscosity that reflects chromatin condensation state.Within Chroma-V,efficient FRET process from Hoe to BDP facilitated a single-excitation ratiometric imaging of nucleus DNA under fluorescence confocal microscope,which utilized the ratio of two channels to enable an intuitive visualization of chromatin condensation state.And fluorescence lifetime imaging(FLIM) based on fluorescent signal from BDP proved to be a more accurate method to quantify the changes of chromatin condensation state under different epigenetic states,including histone acetylation regulated by deacetylase inhibitors,cell apoptosis induced by DNA-bining drugs,and the epithelialmesenchymal transition of HUVEC cells induced by TGF-β. | Xinfu Zhang Lu Wang Ning Li Yi Xiao | 2021 | Chinese Chemical Letters2021，32，8： | 0 |
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