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From one linear genome to a graph-based pan-genome: a new era for genomics

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Science China(Life Sciences) 2020年第12期63卷 1938-1941页

作者： yucheng liu Zhixi Tian State Key Laboratory of Plant Cell and Chromosome Engineering Center for Genome EditingInstitute of Genetics and Developmental BiologyInnovation Academy for Seed DesignChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

The seeds for genomics were sown with the development of DNA sequencing(Sanger et al., 1977), cultivated with each advance in molecular biology, and have since grown into one of the most important aspects of the life sciences. With the sequencing of the first draft human genome(Venter et al.,2001), the era of post-genomics began. Once one genome has been sequenced, it can be used as the reference for a certain species, and sequences from individuals can be mapped onto it to compare genetic variations among different lines.

关键词： Sanger genome genomics

Two dimensional metal halide perovskites: Promising candidates for light-emitting diodes

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Journal of Energy Chemistry 2019年第10期28卷 97-110页

作者： Lu Zhang yucheng liu Zhou Yang Shengzhong(Frank)liu Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of EducationSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710119ShaanxiChina Laboratory of Applied Surface and Colloid Chemistry National Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologyInstitute for Advanced Energy MaterialsSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710119ShaanxiChina iChEM Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina

Two dimensional halide perovskites are emerging as attractive electroluminescent materials for developing high-performance light-emitting devices owing to their unique structures and/or superior optoelectronic *** review begins with an introduction to the working principles of and the key figures for evaluating the performance of ***,the structure and optoelectronic properties of two dimensional perovskites are summarized and discussed. Their advantages in LED application over their 3D counterparts are systematically *** the theoretically discussion,the progresses on the preparation of two dimensional perovskite materials as well as their performances in LEDs have been summarized. At last,several challenges and prospects are presented for achieving high performance 2D perovskite-based LEDs.

关键词： Perovskite 2D LEDs External quantum efficiency

Multiplicity-Free Gradings on Semisimple Lie and Jordan Algebras and Skew Root Systems

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Algebra Colloquium 2019年第1期26卷 123-138页

作者： Gang Han yucheng liu Kang Lu Department of Mathematics Zhejiang University Hangzhou 310027 China

A G-grading on an algebra, where G is an abelian group, is called multiplicityfree if each homogeneous component of the grading is 1-dimensional. We introduce skew root sys tems of Lie type and skew root systems of Jordan type, and use them to cons true t multiplicity-free gradings on semisimple Lie algebras and on semisimple Jordan algebras respectively. Under certain conditions the corresponding Lie (resp., Jordan) algebras are simple. Two families of skew root systems of Lie type (resp., of Jordan type) are constructed and the corresponding Lie (resp., Jordan) algebras are identified. This is a new approach to study abelian group gradings on Lie and Jordan algebras.

关键词： multiplicity-free grading symplectic abelian group skew root system simple Lie algebra simple Jordan algebra

High-quality perovskite MAPbI_3 single crystals for broad-spectrum and rapid response integrate photodetector

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Journal of Energy Chemistry 2018年第3期27卷 722-727页

作者： Yunxia Zhang yucheng liu Zhou Yang Shengzhong(Frank)liu Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices ShaanxiEngineering Lab for Advanced Energy TechnologyInstitute for Advanced Energy MaterialsSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710119ShaanxiChina iChEM Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina

Organic–inorganic single-crystalline perovskites have attracted significant attentions due to their exceptional progress in intrinsic properties＇ investigation and applications in photovoltaics and optoelectronics. In this study, the large perovskite CH3NH3PbI3 single crystal with the largest length of 80 mm was prepared through the method of inverse-temperature crystallization. Meanwhile, the mass production of integrate photodetectors have been fabricated on the single-crystalline wafer and the photoresponse performances were investigated. The results show that the single-crystalline photodetectors have broad spectrum response to 900 nm, rapid response speed（〈40 μs） and excellent stability. These findings are of great importance for future promising perovskite single crystalline for integrated photoelectronic application.

关键词： Single-crystalline Perovskite Photodetector Rapid response

Super graph-based pan-genome: Bringing rice functional genomic study into a new dawn

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Molecular Plant 2022年第9期15卷 1409-1411页

Rice is one of the earliest domesticated crops that has been cultivated for thousands of ***,unlike other crops that are predominantly domesticated by a singleto neventin one place,the domestication of rice is quite complicated;it independently occurred in Asia and Africa toform the Asian cultivated rice Oryza sativa and the African cultivated rice ***,*** was mainly domesticated from the Asian wild rice *** in East/South Asia(Huang et al.,2012).Furthermore,*** can be classified into two main types:Geng(*** ***)and Xian(*** ***).Geng was domesticated as early as 9000 years ago,while Xian was domesticated lateralong with continuousgene flow from Geng(Choi etal.,2017).*** domesticated from African wild rice *** approximately 3500 years *** and *** diverged approximately 600000 years ago.

关键词： cultivated crops japonica

Constitutive modeling of viscoelastic-viscoplastic behavior of short fiber reinforced polymers coupled with anisotropic damage and moisture effects

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Acta Mechanica Sinica 2019年第3期35卷 495-506页

作者： Ge He yucheng liu Xingqiao Deng Lei Fan Department of Mechanical Engineering Mississippi State UniversityStarkville 39762USA School of Mechanical Engineering and Automation Xihua UniversityChengdu 610039China Department of Engineering Durham UniversityDurham DH1 3LEUK

In this paper, a combined viscoelasticity-viscoplasticity model, coupled with anisotropic damage and moisture effects, is developed for short fiber reinforced polymers (SFRPs) with different fiber contents and subjected to a variety of strain rates. In our model, a rate-dependent yield surface for the matrix phase is employed to identify initial yielding of the material. When an SFRP is loaded at small deformation before yielding, its viscoelastic behavior can be described using the generalized Maxwell model, while when plasticity occurs, a scalar internal state variable (ISV) is used to capture the hardening behavior caused by the polymeric constituent of the composite. The material degradation due to the moisture absorption of the composite is modeled by employing another type of ISV with different evolution equations. The complicated damage state of the SFRPs is captured by a second rank tensor, which is further decomposed to model the subscale damage mechanisms of micro-voids/cracks nucleation, growth and coalescence. It is concluded that the proposed constitutive model can be used to accurately describe complicated behaviors of SFRPs because the results predicted from the model are in good agreement with the experimental data.

关键词： Short fiber reinforced polymer Internal state variable Anisotropic damage Moisture effect Viscoelasticity-viscoplasticity

Temperature driven antagonistic fate determination by two bHLH transcription factors:dormancy or germination

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Science China(Life Sciences) 2023年第5期66卷 1208-1209页

Dormancy or germination is an essential question that seed plants have to *** natural circumstances,seeds of plants usually maintain the status of dormancy until they meet the optimal condition to trigger the germinat... 详细信息

关键词： germination maintain determination

Catalytic Pyrolysis of Soybean Oil with CaO/Bio-Char Based Catalyst to Produce High Quality Biofuel

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Journal of Renewable Materials 2022年第12期10卷 3107-3118页

作者： Lujiang Xu Geliang Xie Xianjun Zhou yucheng liu Zhen Fang Biomass Group College of EngineeringNanjing Agricultural UniversityNanjing210031China

In this paper,CaO/bio-char was synthesized by directly co-pyrolysis of Ca(OH)_(2) and rice straw,and used as catalyst to catalytic pyrolysis of soybean oil to produce high quality *** this co-pyrolysis process,CaO particles has been successfully embedded on the bio-char *** the catalytic pyrolysis process,CaO/biochar showed a good catalytic performance on the deoxygenation of soybean *** temperature affected the pyrolysis reactions and pyrolytic products distributions dramatically,higher pyrolysis temperature lead to seriously cracking reactions,lower bio-oil yield and higher gases yield,and lower pyrolysis temperature lead to higher bio-oil yield with higher oxygenated compounds content and lower hydrocarbons contents,the suitable pyrolysis temperature was around 650℃.Under the optimal conditions(650℃ with WHSV at 6.4 h^(−1) and carrier gas flow rate at 100 ml/min),the selectivity(%)of hydrocarbons in the bio-oil was more than 90%.CaO/bio-char catalyst still shows good catalytic deoxygenation activity after 4 cycles.1 g of CaO/bio-char catalyst can catalyze pyrolysis of 32 g of soybean oil to produce high-quality liquid ***-char based catalyst has been proved to be a promising catalyst for catalytic conversion of triglyceride-based lipids into high quality liquid biofuel.

关键词： Carbonization CaO/bio-char catalytic pyrolysis deoxygenation high quality biofuel

Improved perovskite solar cell efficiency by tuning the colloidal size and free ion concentration in precursor solution using formic acid additive

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Journal of Energy Chemistry 2020年第2期29卷 43-51页

作者： Lina Meng Qingbo Wei Zhou Yang Dong Yang Jiangshan Feng Xiaodong Ren yucheng liu Shengzhong(Frank)liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologyInstitute for Advanced Energy MaterialsSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710119ShaanxiChina Key Laboratory of Chemical Reaction Engineering of Shaanxi Province College of Chemistry and Chemical EngineeringYan'an UniversityYan'an 716000ShaanxiChina iChEM Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina

Improving the quality of the perovskite active layer is crucial to obtaining high performance perovskite solar cells(PSCs). In this work, by introducing formic acid into the formamidinium lead iodide(FAPbI3)precursor solution, we managed to achieve reduced colloidal size in the solution, leading to more uniform deposition of FAPbI3 film with lower trap state density and higher carrier mobility. The solar cells based on the FAPbI3 absorber layer modified with formic acid show significantly better photovoltaic performance than that on the reference FAPbI3 film without formic acid. The device performance shows a close correlation with the colloidal size. Within the range studied from 6.7 to 1.0 nm, the smaller the colloidal size is, the higher the solar cell efficiency. More specifically, the cell efficiency is improved from17.82% for the control cell without formic acid to 19.81% when 0.764 M formic acid was used. Formic acid has also been added into a CH3NH3PbI3(MAPbI3) precursor solution, which exhibits a similar effect on the resulting MAPb I3 films and solar cells, with efficiency improved from 16.07% to 17.00%.

关键词： Perovskite solar cell Crystallization Formic acid Additive