检索结果-南通市图书馆

Dual effects of spatial updating in both real and virtual environments

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2013年第8期58卷 898-906页

作者： LIU ShuQing zheng xianjun sam LIU XianYun PENG KaiPing Department of Psychology Tsinghua University Academy of Psychology and Behaviour Tianjin Normal University Department of Psychology University of California

When people move around in their environment, spatial updating, which is an automatic cognitive process, is essential to ensuring people can keep track of their relations between them and the surrounding objects, and to "recalculating" the relative position and orientation of those objects with regard to the current position of the persons. Despite the facilitating effect of spatial updating to people's mental representation in most circumstances as demonstrated in most of the existing literature, the effect sometimes can be adversarial. For instance, some research suggested that even though people were asked to ignore their locomotion, it is difficult to suppress updating of the spatial representation during movement. The current two studies were conducted to systematically investigate the dual effects of spatial updating in both real and virtual environments. We used a typical spatial updating paradigm to explore the effects of scene familiarity (familiar vs. novel) and person's locomotion (stationary vs. moving) on change detection accuracy (target object moved or not). The results indicated a facilitating effect of spatial updating in the novel scene condition, but an adversarial effect in the familiar scene condition-the dual effects, in both real and virtual environments.

关键词：虚拟环境空间重影运动过程相对位置对象移动认知过程心理表征

应用特征整合理论优化基于图像符号的信息可视化设计

在线全文

学校读者我要写书评

暂无评论

计算机辅助设计与图形学学报 2016年第1期28卷 16-24页

作者：李义娜蔡壮郑先隽张康南开大学商学院天津300071 天津大学软件学院天津300072 清华大学心理系北京100084

特征整合理论是视觉注意方面最有影响力的重要理论之一,为优化视觉沟通提供了理论基础.文中提出应用玫瑰曲线设计花形图像符号的方法,利用用户在前注意阶段的自动的、无意识的加工过程,引导用户觉察到目标信息,从而优化用户对信息可视... 详细信息

特征整合理论是视觉注意方面最有影响力的重要理论之一,为优化视觉沟通提供了理论基础.文中提出应用玫瑰曲线设计花形图像符号的方法,利用用户在前注意阶段的自动的、无意识的加工过程,引导用户觉察到目标信息,从而优化用户对信息可视化设计的视觉搜索过程.文中提出的图像符号在信息可视化的应用中能够映射6个变量,变量特征容易识别,并且便于表现2个变量间的比例关系.通过对2008年美国教育经费投入的案例研究,实践了基于明确信息搜索目标的信息可视化设计和探索性的信息可视化设计;通过眼动实验测试用户的首次注视时间和5 s的注视时间,探索了用户优先处理的视觉对象,提出了运用花形图像符号控制符号视觉特征相似性以优化用户视觉体验的方法.

关键词：特征整合理论信息可视化图像符号前注意阶段

Metabolic profiling of DREB-overexpressing transgenic wheat seeds by liquid chromatographymass spectrometry

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2020年第6期8卷 1025-1036页

作者： Fengjuan Niu Qiyan Jiang xianjun Sun zheng Hu Lixia Wang Hui Zhang Institute of Crop Sciences National Key Facility for Crop Gene Resources and Genetic ImprovementChinese Academy of Agricultural SciencesBeijing 100081China

DREBs are transcription factors that regulate abiotic stress tolerance in ***,we reported that wheat transgenic lines overexpressing Gm DREB1 showed increased tolerance to drought and salt ***,the molecular basis of increased tolerance is still poorly understood,and whether the overexpression of DREB will cause unexpected effects is also of *** performed seed metabolic profiling of the genetically modified(GM)wheat T349 and three non-GM cultivars with LC-MS to identify the metabolic basis of stress tolerance and to assess the unexpected effects of exogenous gene *** we did not note the appearance of novel metabolites or the disappearance of existing metabolites,overexpression of the transcription factor Gm DREB1 in T349 wheat influenced metabolite levels in *** levels of stress tolerance-associated metabolites were found in the stress-sensitive non-transgenic acceptor counterpart J19,while metabolites associated with cell membrane structure and stability accumulated in *** these metabolites in T349,most showed levels similar to those in the non-GM *** of Gm DREB1 in T349 may cause a shift in its metabolic profile leading to down-regulation of several energy-consuming processes to favor increased yield under stress conditions,which is a reasonable expectation of breeders while creating the GM wheat and Gm DREB1 overexpression did not cause unexpected effects in T349 *** results may be helpful for GM crop research and risk assessment.

关键词： Transgenic wheat Metabolomics LC-MS DREB Drought tolerance

Function of the auxin-responsive gene TaSAUR75 under salt and drought stress

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2018年第2期6卷 181-190页

作者： Yuan Guo Qiyan Jiang zheng Hu xianjun Sun Shoujin Fan Hui Zhang Institute of Crop Science National Key Facility for Crop Gene Resources and Genetic Improvement Chinese Academy of Agricultural Sciences College of Life Science Shandong Normal University

Small auxin-upregulated RNAs(SAURs) are genes regulated by auxin and environmental factors. In this study, we identified a SAUR gene in wheat, Ta SAUR75. Under salt stress,Ta SAUR75 is downregulated in wheat roots. Subcellular localization revealed that Ta SAUR75 was localized in both the cytoplasm and nucleus. Overexpression of Ta SAUR75 increased drought and salt tolerance in Arabidopsis. Transgenic lines showed higher root length and survival rate and higher expression of some stress-responsive genes than control plants under salt and drought stress. Less H_2O_2 accumulated in transgenic lines than in control plants under drought stress. Our findings reveal a positive regulatory role of the auxin-responsive gene Ta SAUR75 in plant responses to drought and salt stress and provide a candidate gene for improvement of abiotic stress tolerance in crop breeding.

关键词： TaSAUR75 Drought Salt ROS Wheat Arabidopsis

Magnetic Inertial Confinement Fusion(MICF)

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2016年第11期18卷 1055-1063页

作者： MIAO Feng zheng xianjun DENG Baiquan LIU Wei OU Wei HUANG Yi Institute of Atomic and Molecular Physics Sichuan University Chengdu 610065 China HOPE Innovations Inc. Ontario L4W0A5 Canada Southwestern Institute of Physics Chengdu 610041 China Southwest University for Nationalities Chengdu 610041 China Institute of Nuclear Science and Technology Sichuan University Chengdu 610064 China

t Based on the similarity in models of the early Sun and the 3-D common focal region of the micro-pinch in X-pinch experiments, a novel hybrid fusion configuration by continuous focusing of multiple Z-pinched plasma beams on spatially symmetric plasma is proposed. By replacing gravity with Lorentz force with subsequent centripetal spherical pinch, the beam- target fusion reactivity is enhanced in a quasi-spherical converging region, thus achieving MICF. An assessment, presented here, suggests that a practical fusion power source could be achieved using deuterium alone. Plasma instabilities can be suppressed by fast rotation resulting from an asymmetric tangential torsion in the spherical focal region of this configuration. Mathematical equivalence with the Sun allows the development of appropriate equations for the focal region of MICF, which are solved numerically to provide density, temperature and pressure distributions that produce net fusion energy output. An analysis of MICF physics and a preliminary experimental demonstration of a single beam are also carried out.

关键词： MICF centripetal spherical pinch beam-target enhancement

RNA-seq analysis of unintended effects in transgenic wheat overexpressing the transcription factor GmDREB1

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2017年第3期5卷 207-218页

作者： Qiyan Jiang Fengjuan Niu xianjun Sun zheng Hu Xinhai Li Youzhi Ma Hui Zhang Institute of Crop Science National Key Facility for Crop Gene Resources and Genetic ImprovementChinese Academy of Agricultural SciencesBeijing 100081China

The engineering of plants with enhanced tolerance to abiotic stresses typically involves complex multigene networks and may therefore have a greater potential to introduce unintended effects than the genetic modification for simple monogenic traits. For this reason, it is essential to study the unintended effects in transgenic plants engineered for stress tolerance. We selected drought-and salt-tolerant transgenic wheat overexpressing the transcription factor, GmDREB1, to investigate unintended pleiotropic effects using RNA-seq analysis. We compared the transcriptome alteration of transgenic plants with that of wild-type plants subjected to salt stress as a control. We found that GmDREB1 overexpression had a minimal impact on gene expression under normal ***1 overexpression resulted in transcriptional reprogramming of the salt response,but many of the genes with differential expression are known to mitigate salt stress and contribute incrementally to the enhanced stress tolerance of transgenic wheat. GmDREB1 overexpression did not activate unintended gene networks with respect to gene expression in the roots of transgenic wheat. This work is important for establishing a method of detecting unintended effects of genetic engineering and the safety of such traits with the development of marketable transgenic crops in the near future.

关键词： Unintended effects Transgenic wheat Transcription factor RNA-seq DREB

50 ppm of Pd dispersed on Ni（OH）2 nanosheets catalyzing semi-hydrogenation of acetylene with high activity and selectivity

在线全文

学校读者我要写书评

暂无评论

Nano Research 2018年第2期11卷 905-912页

作者： Hu, Mingzhen Zhang, Jian Zhu, Wei Chen, zheng Gao, Xin Du, xianjun Wan, Jiawei Zhou, Kebin Chen, Chen Li, Yadong School of Chemistry and Chemical Engineering University of Chinese Academy of Sciences Beijing China Department of Chemistry Tsinghua University Beijing China

We report a highly efficient Pd/Ni（OH）2 catalyst loaded with ultra-low levels of palladium （50 ppm Pd by mass） for the selective hydrogenation of acetylene to ethylene. The turnover frequency for acetylene conversion over the 0.005% Pd/Ni（OH）2 catalyst is twice that of the equivalent 0.8% Pd/Ni（OH）2 catalyst. Notabl an acetylene-to-ethylene selectivity of 80% was achieved over a wide range of temperatures. Aberration-corrected high-angle annular dark-field scanning transmission electron microscopy was used to reveal the atomically dispersed nature of palladium in the 0.005% Pd/Ni（OH）2 catalyst. The excellent selectivity of this catalyst is attributed to its atomically dispersed Pd sites, while the abundant hydroxyl groups of the support significantly enhance the acetylene conversion activity. This work opens up innovative opportunities for new types of highly efficient catalysts with trace noble-metal loadings for a wide variety of reactions.

关键词： catalyst trace-loading palladium hydrogenation

What State Can Do for Human Rights Education

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Journal of Human Rights 2007年第1期6卷 33-35页

作者： zheng xianjun School of Politics and Lawunder the Capital Normal University (Beijing).

The human rights education is an educational activity aimed at cultivating the sense of respecting human rights,1 International organizations, non-government organizations （NGOs）, the State, local groups, families, schools, commtmities and citizens all have their respective and irreplaceable roles in it, while the State is the main body responsible for promoting human fights education. At a time when human fights have walked out of scholars＇ studies and statues of constitutions and laws towards society and life. That is to say, at a time when the slogan of human fights is materialized, there arise some outstanding questions such as： Who are to be the educators？ Who are to be educated？ What should be taught？ How is the education conducted？ This article is to present an initial analysis of the issues associated with the State as the major actor in human fights education.

关键词：

Gene editing and overexpression of soybean miR396a reveals its role in salinity tolerance and development

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2024年第6期12卷 1655-1665页

作者： Xiangqian Chen Xuemin Jiang xianjun Sun zheng Hu Fei Gao Xiuping Wang Hui Zhang Rui Chen Qiyan Jiang State Key Laboratory of Crop Gene Resources and Breeding Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China Key Laboratory of Grain Crop Genetic Resources Evaluation and Utlization Ministry of Agriculture and Rural Affairs Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China Institute of Crop Germplasm and Biotechnology Tianjin Academy of Agricultural SciencesTianjin 300192China National Nanfan Research Institute Chinese Academy of Agricultural SciencesSanya 572000HainanChina College of Life and Environmental Sciences Minzu University of ChinaBeijing 100081China Institute of Coastal Agriculture Hebei Academy of Agriculture and Forestry ScienceTangshan 063299HebeiChina

MicroRNAs(miRNAs)are versatile regulators of gene expression at both the transcription and posttranscription *** microRNA miR396 plays vital roles in growth,development,and resistance to abiotic stresses in many plant ***,the roles and functions of miR396 in soybeans are not well ***,we report that Gm-miR396a influences soybean development and salinity *** found that soybean miR396a was responsive to salt ***-miR396a gene-edited lines(miR396a-GEs),created using CRISPR/Cas9,exhibited more branches,higher grain yields,and greater salinity tolerance than control *** transcripts in lines with altered abundance of miR396a-GE were significantly enriched for biological processes related to hormone *** of the Gm-miR396a precursor(pre-miR396a-OE)resulted in developmental deficiencies including dwarfness,abnormal inflorescences and flowers,smaller and fewer seeds,and small leaves with larger and more numerous *** analysis indicated photosynthesis-related genes were downregulated in pre-miR396a-OE *** results contribute valuable insights into the function of GmmiR396a in soybeans and hold promise for enhancing soybean yield and salinity tolerance through germplasm innovation.

关键词： Glycine max Gm-miR396a Salt stress CRISPR/Cas9