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Thermal performance of a single-layer packed metal pebble-bed exposed to high energy fluxes

Frontiers in Energy 2021年第2期15卷 513-528页

作者： shengchun zhang Zhifeng WANG Hui BIAN Pingrui HUANG Key Laboratory of Solar Thermal Energy and Photovoltaic System Chinese Academy of SciencesBeijing 100190China Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China Beijing Engineering Research Center of Solar Thermal Power Beijing 100190China 2.Lanzhou University of TechnologyLanzhou 730050China

It is difficult to accurately measure the temperature of the falling particle receiver since thermocouples may directly be exposed to the solar *** study analyzes the thermal performance of a packed bed receiver using large metal spheres to minimize the measurement error of particle temperature with the sphere temperature reaching more than 700°C in experiments in a solar furnace and a solar *** numerical models of a single sphere and multiple spheres are verified by the *** multiple spheres model includes calculations of the external incidence,view factors,and heat *** effects of parameters on the temperature variations of the spheres,the transient thermal efficiency,and the temperature uniformity are investigated,such as the ambient temperature,particle thermal conductivity,energy flux,sphere diameter,and sphere *** the convection is not considered,the results show that the sphere emissivity has a significant influence on the transient thermal efficiency and that the temperature uniformity is strongly affected by the energy flux,sphere diameter,and sphere *** the emissivity increases from 0.5 to 0.9,the transient thermal efficiency and the average temperature variance increase from 53.5%to 75.7%and from 14.3%to 27.1%at 3.9 min,*** average temperature variance decreases from 29.7%to 9.3%at 2.2 min with the sphere diameter increasing from 28.57 mm to 50 *** the dimensionless energy flux increases from 0.8 to 1.2,the average temperature variance increases from 13.4%to 26.6%at 3.4 min.

关键词： packed bed solar thermal power plants high heat fluxes radiative heat transfer

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Expression pattern of GASA,downstream genes of DELLA,in Arabidopsis

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Chinese Science Bulletin 2008年第24期53卷 3839-3846页

作者： zhang shengchun WANG XiaoJing College of Life Sciences South China Normal University Guangdong Provincial Key Lab of Biotechnology for Plant Development Guangzhou 510631 China

Separation and functional research of related components involved in gibberellins(GAs) signaling are important to clarify the mechanism of GA *** on the downstream components of DELLA,the key factor of the GA signaling pathway,is limited at ***(GA-Stimulated in Arabidopsis) family contains 15 genes usually regulated by GA in Arabidopsis *** GASA proteins have a cleavable signal peptide in N terminus and a conserved GASA domain including 12 cysteines in C ***-PCR analysis revealed that the expression of GASA4 and GASA6 were down-regulated,but GASA1 and GASA9 were up-regulated in the DELLA mutants,gai-t6 and rga-24,as well as the double mutant,consisting with the results that GASA4 and GASA6 were induced,but GASA1 and GASA9 were inhibited by exogenous *** addition,the expression patterns of other GASA genes were regulated by GA and ABA,separately or *** of GASA genes were expressed in roots,stems,leaves,flowers and developing *** gene driven by the promoters of GASA6,GASA7,GASA8,GASA9,GASA10,GASA11 and GASA12 were used as reporters and it was found that all GASA genes expressed in the growing and differentiating organs and abscission zones,suggesting the role of these genes in cell growth and *** study provided an important basis for functional study of the GASA gene family in the GA and ABA signaling pathway.

关键词： GASA DELLA GA ABA 基因

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SUMO E3 Ligase AtMMS21 Regulates Drought Tolerance in Arabidopsis thaliana

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Journal of Integrative Plant Biology 2013年第1期55卷 83-95页

作者： shengchun zhang Yanli Qi Ming Liu Chengwei Yang Guangdong Key Lab of Biotechnology for Plant Development College of Life Science South China Normal University

Post-translational modifications of proteins by small ubiquitin-like modifiers （SUMOs） play crucial roles in plant growth and development, and in stress responses. The MMS21 is a newly-identified Arabidopsis thaliana L. SUMO E3 ligase gene aside from the SIZ1, and its function requires further elucidation. Here, we show that MMS21 deficient plants display improved drought tolerance, and constitutive expression of MMS21 reduces drought tolerance. The expression of MMS21 was reduced by abscisic acid （ABA）, polyethylene glycol （PEG） or drought stress. Under drought conditions, mms21 mutants showed the highest survival rate and the slowest water loss, and accumulated a higher level of free proline compared to wild-type （WT） and MMS21 over-expression plants. Stomatal aperture, seed germination and cotyledon greening analysis indicated that mms21 was hypersensitive to ABA. Molecular genetic analysis revealed that MMS21 deficiency led to elevated expression of a series of ABA-mediated stress-responsive genes, including COR15A, RD22, and P5CS1 The ABA and drought-induced stress-responsive genes, including RAB18, RD29A and RD29B, were inhibited by constitutive expression of MMS21. Moreover, ABA-induced accumulation of SUMO-protein conjugates was blocked in the mms21 mutant. We thus conclude that MMS21 plays a role in the drought stress response, likely through regulation of gene expression in an ABA-dependent pathway.

关键词： ABA AtMMS21 drought tolerance SUMO.

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Perturbation of Auxin Homeostasis Caused by Mitochondrial FtSH4 Gene-Mediated Peroxidase Accumulation Regulates Arabidopsis Architecture

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Molecular Plant 2014年第5期7卷 856-873页

作者： shengchun zhang Juelin Wu Dongke Yuan Daowei zhang Zhigang Huang Langtao Xiao Chengwei Yang Guangdong Key Lab of Biotechnology for Plant Development College of Life Sciences South China Normal University Guangzhou 510631 China Hunan Provincial Key Laboratory of-Phytohormones and Growth Development Hunan Agricultural University Changsha 410128 China

Reactive oxygen species and auxin play important roles in the networks that regulate plant development and morphogenetic changes, However, the molecular mechanisms underlying the interactions between them are poorly understood. This study isolated a mas （More Axillary Shoots） mutant, which was identified as an allele of the mitochondrial AAA-protease AtFtSH4, and characterized the function of the FtSH4 gene in regulating plant development by medi- ating the peroxidase-dependent interplay between hydrogen peroxide （H2Oz） and auxin homeostasis. The phenotypes of dwarfism and increased axillary branches observed in the mas （renamed as ftsh4-4） mutant result from a decrease in the IAA concentration. The expression levels of several auxin signaling genes, including IAA1, IAA2, and IAA3, as well as several auxin binding and transport genes, decreased significantly in ftsh4-4 plants. However, the H202 and peroxidases levels, which also have IAA oxidase activity, were significantly elevated in ftsh4-4 plants. The ftsh4-4 phenotypes could be reversed by expressing the iaaM gene or by knocking down the peroxidase genes PRX34 and PRX33. Both approaches can increase auxin levels in the ftsh4-4 mutant. Taken together, these results provided direct molecular and genetic evidence for the interaction between mitochondrial ATP-dependent protease, H2O2, and auxin homeostasis to regulate plant growth and development.

关键词： Arabidopsis thaliana auxin development FtSH4 hydrogen peroxide IAA oxidation peroxidase.

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基于GaN的Ku波段四通道T/R组件设计

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火控雷达技术 2024年第2期53卷 90-95页

作者：李宁陈福媛王洁廖原张生春西安电子工程研究所西安710100

本文介绍了一种基于GaN功放芯片的Ku波段四通道T/R组件。该组件具有高效率、高集成、小体积、重量轻、模块化等特点。文章从T/R组件射频链路框架、收发通道指标推算、射频转接仿真方面进行阐述。最终测试结果显示,该组件在2GHz工作带宽... 详细信息

本文介绍了一种基于GaN功放芯片的Ku波段四通道T/R组件。该组件具有高效率、高集成、小体积、重量轻、模块化等特点。文章从T/R组件射频链路框架、收发通道指标推算、射频转接仿真方面进行阐述。最终测试结果显示,该组件在2GHz工作带宽内性能优良,发射功率大于40dBm,效率高于28%;接收增益大于29.5dB,噪声系数小于3.6。

关键词： Ku波段 T/R组件 GaN MMIC

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A Putative Chloroplast-Localized Ca2＋/H＋ Antiporter CCHA1 Is Involved in Calcium and pH Homeostasis and Required for PSII Function in Arabidopsis

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Molecular Plant 2016年第8期9卷 1183-1196页

作者： Chao Wang Weitao Xu Honglei Jin Taijie zhang Jianbin Lai Xuan Zhou shengchun zhang Shengjie Liu Xuewu Duan Hongbin Wang Changlian Peng Chengwei Yang Guangdong Key Lab of Biotechnology for Plant Development College of Life Science South China Normal University Guangzhou 510631 China State Key Laboratory of Biocontrel and Guangdeng Key Laboratory of Plant Resources School of Life Sciences Sun Yat-sen University Guangzhou 510275 China Key Laboratory of Plant Resource Conservation and Sustainable Utilization South Ohina Botanical Garden Chinese Academy of Sciences Guangzheu Guangdong Province 510650 China

Calcium is important for chloroplast, not only in its photosynthetic but also nonphotosynthetic functions. Mul- tiple Ca2＋/H＋ transporters and channels have been described and studied in the plasma membrane and organ- elle membranes of plant cells; however, the molecular identity and physiological roles of chloroplast Ca2＋/H＋ antiporters have remained unknown. Here we report the identification and characterization of a member of the UPFO016 family, CCHA1 （a chloroplast-localized potential Ca2＋/H＋ antiporter）, in Arabidopsis thaliana. We observed that the ccha I mutant plants developed pale green leaves and showed severely stunted growth along with impaired photosystem II （PSII） function. CCHA1 localizes to the chloroplasts, and the levels of the PSII core subunits and the oxygen-evolving complex were significantly decreased in the ccha I mutants compared with the wild type. In high Ca2＋ concentrations, Arabidopsis CCHA1 partially rescued the growth defect of yeast gdtl3 null mutant, which is defective in a Ca2＋/H＋ antiporter. The cchal mutant plants also showed significant sensitivity to high concentrations of CaCI2 and MnCI2, as well as variation in pH. Taken these results together, we propose that CCHA 1 might encode a putative chloroplast-localized Ca2＋/H＋ antiporter with critical functions in the regulation of PSII and in chloroplast Ca2＋ and pH homeostasis in Arabidopsis.

关键词： Ca2+/H+ antiporter Ca2+ homeostasis pH homeostasis CCHA1

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Different mechanisms underlie similar species-area relationships in two tropical archipelagoes

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Plant Diversity 2024年第2期46卷 238-246页

作者： shengchun Li Tieyao Tu Shaopeng Li Xian Yang Yong Zheng Liang-Dong Guo Dianxiang zhang Lin Jiang Key Laboratory of Plant Resources Conservation and Sustainable Utilization South China Botanical GardenChinese Academy of SciencesGuangzhou 510650China ECNU-Alberta Joint Lab for Biodiversity Study Tiantong Forest Ecosystem National Observation and Research StationSchool of Ecological and Environmental SciencesEast China Normal UniversityShanghai 200241China School of Biological Sciences Georgia Institute of TechnologyAtlantaGA 30332USA Jiangxi Academy of Forestry Nanchang 330032China Institute of Eco-Chongming(IEC) Shanghai 202162China State Key Laboratory of Biocontrol School of EcologySun Yat-sen UniversityGuangzhou 510275China School of Geographical Sciences Fujian Normal UniversityFuzhou 350007China State Key Laboratory of Mycology Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China

Despite much research in the field of island biogeography,mechanisms regulating insular diversity remain ***,we aim to explore mechanisms underlying plant species-area relationships in two tropical archipelagoes in the South China *** found positive plant species-area relationships for both coral and continental ***,our results showed that different mechanisms contributed to similar plant species-area relationships between the two *** coral islands,soil nutrients and spatial distance among communities played major roles in shaping plant community structure and species *** contrast,the direct effect of island area,and to a lesser extent,soil nutrients determined plant species richness on continental ***,increasing soil nutrients availability(N,P,K)had opposite effects on plant diversity between the two *** summary,the habitat quality effect and dispersal limitation are important for regulating plant diversity on coral islands,whereas the passive sampling effect,and to a lesser extent,the habitat quality effect are important for regulating plant diversity on continental *** generally,our findings indicate that island plant species-area relationships are outcomes of the interplay of both niche and neutral processes,but the driving mechanisms behind these relationships depends on the type of islands.

关键词： Coral and continental islands Plant diversity Soil nutrients Species-area relationships The sampling effect

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显微镜下精索静脉低位结扎术治疗精索静脉曲张的效果及对性功能的影响

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中外医疗 2024年第16期43卷 13-16页

作者：俞婷唐华陈剑郭昌平王永富叶德川章盛椿三明市第二医院泌尿外科福建三明366000

目的对精索静脉曲张(Varicocele, VC)患者应用显微镜下精索静脉低位结扎术(以下简称低位结扎术),探讨其效果及对精子质量、性功能的影响。方法回顾性选取2020年1月—2022年12月三明市第二医院收治的86例VC患者的临床资料,根据手术方... 详细信息

目的对精索静脉曲张(Varicocele, VC)患者应用显微镜下精索静脉低位结扎术(以下简称低位结扎术),探讨其效果及对精子质量、性功能的影响。方法回顾性选取2020年1月—2022年12月三明市第二医院收治的86例VC患者的临床资料,根据手术方案分组,对照组43例行精索高位结扎术,观察组43例行低位结扎术,比较两组患者围术期指标、精子质量、并发症、性功能。结果观察组手术时间长于对照组,术中出血量、术后3 d疼痛视觉模拟评分、住院时间均优于对照组,差异有统计学意义(P均0.05),术后两组精子质量相关指标比较,观察组优于对照组,差异有统计学意义(P均0.05),术后,观察组上述性功能评分指标均优于对照组,差异有统计学意义(P均<0.05)。结论对VC患者而言,显微镜下精索静脉低位结扎术具有较好应用前景,既能减轻术后疼痛,加速康复,还可提高精子质量,有效提高患者性功能,减少术后并发症发生,值得临床借鉴。

关键词：显微镜精索静脉低位结扎术疗精索静脉曲张性功能

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Signal space transform and multidimensional information joint processing for moving target

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Chinese Journal of Acoustics 2024年第1期43卷 23-48页

作者： SHI Yunjia PIAO shengchun GUO Junyuan zhang Liu Acoustic Science and Technology Laboratory Harbin Engineering UniversityHarbin 150001 Key Laboratory of Marine Information Acquisition and Security(Harbin Engineering University) Ministry of Industry and Information TechnologyHarbin 150001 College of Underwater Acoustic Engineering Harbin Engineering UniversityHarbin 150001

A signal space transform method for detection of line spectrum signals radiated by moving target is *** time-frequency analysis and beamforming processing,a three-dimensional(3D)time-frequency-azimuth signal space is obtained in the array coordinate *** certain target course angle,this 3D signal space is transformed to the time-frequency-relative bearing spectrum signal space in the target coordinate *** theoretical derivation,simulation,and experimental data processing are *** findings demonstrate that the method is capable of converting the target line spectrum signal 3D trajectory to a 2D trajectory on the corresponding slice in the transformed signal space and signal processing gain of multi-dimensional information joint processing is obtained easier than in 3D signal space.

关键词： system. moving transformed

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Arabidopsis Ft SH gene MAS-mediated Interaction of H2O2 with Auxin to Regulate the Plant Growth and Development

Arabidopsis Ft SH gene MAS-mediated Interaction of H2O2 with...

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2010全国植物生物学研讨会

作者： shengchun zhang Chengwei Yang Guangdong Key Lab of Biotechnology for Plant Development College of Life Sciences South China Normal University

Currently ROS as a signaling molecule involved in plant development and stress responses has led to extensive attention researchers,but the interaction between ROS and phytohormones study also very *** obtained a new ...

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