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Meso-mechanical anisotropy and fracture evolution of reef limestones from the Maldives Islands and the South China Sea

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第12期15卷 3173-3187页

作者： lihui li Chenglong li Beixiu Huang jianguang li Shouding li Xiao li Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing100049China College of Geoscience and Surveying Engineering China University of Mining and TechnologyBeijing100083China AVIC Institute of Geotechnical Engineering Co. Ltd.Beijing100098China

Reef limestone is a biogenic sedimentary rock widely distributed in coral reef areas, acting as an important foundation for coast construction. Due to its special biogenic origin, reef limestone is different from conventional rocks both in terms of rock structure and mechanical properties. In this study, mesoscale uniaxial compression experiments with five different loading directions were conducted on two kinds of reef limestones from the Maldives Islands and the South China Sea, respectively. The real-time high-resolution videos and images of failure processes were recorded simultaneously to investigate the fracture evolution and fracture surface roughness of reef limestones. It demonstrated that the reef limestones belonged to extremely soft to soft rocks, and their uniaxial compressive strength (UCS) values fluctuated with high discreteness. The mesoscale mechanical properties of reef limestones were highly anisotropic and mainly controlled by pore structure. The occurrence of dissolution pores in reef limestone tended to intensify mechanical anisotropy. With the integration of the fracture initiation and propagation features of reef limestones, it is supposed that the intrinsic mechanism of anisotropy was probably attributed to the differences in coral growth direction and dissolution. Furthermore, the quantified fracture surface roughness was revealed to have a good consistency with density and UCS for the reef limestones from the South China Sea. The findings are helpful for providing theoretical and experimental references for engineering construction in coral reef areas.

关键词： Reef limestone Mechanical anisotropy Failure mode Pore structure Fracture surface roughness

A male-specific SCAR DNA marker and sex ratio of seedlings in salak(Salacca zalacca ***)

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Journal of Forestry Research 2017年第1期28卷 47-50页

作者： Rongsheng li jianguang li Guangtian Yin Jinchang Yang Wentao Zou Lei Bai Research Institute of Tropical Forestry Chinese Academy of Forestry Forestry Bureau of Huicheng District Huizhou City

A male-specific SCAR DNA marker was developed using a RAPD DNA marker specific for male plants of Salacca zalacca var. zalacca （salak palm）. The marker is 1579 bp long and has a GC content of 38.5 %. Its sequence contains 1 or 2 open reading frames, indicating the marker is probably a coding region. No highly similar sequences were found in a search of the GenBank database. Sexes were identified using the SCAR DNA marker for three kinds of seedlings grouped by the number of seeds per fruit （1, 2 or 3）. The sex ratio of female to male did not differ significantly from 1：1 for the three kinds of seedlings, implying that the number of seeds per fruit is not a reliable index to identify the sex of a seedling.

关键词： Salacca Salak SCAR. Sex

Workshop Oriented Tolerance Synthesis for Spatial PKM

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Journal of Harbin Institute of Technology(New Series) 2015年第2期22卷 8-17页

作者： jianguang li Jian Ding Yingxue Yao Zhaohong Yi Huaijing Jing Honggen Fang School of Mechatronics Engineering Harbin Institute of Technology Shanghai Aerospace Equipments Manufacturer

To promote the pose accuracy performance of a spatial parallel kinematic Mechanism( PKM) in service,a workshop oriented tolerance synthesis method based on design of experiment( DOE) is proposed,which involves two consecutive stages. In the first stage of DOE,the tolerance factor sensitivities are obtained according to initial tolerance settings with the consideration of the current manufacturing capacity,and the second stage of DOE makes use of them to produce multiple tolerance allocations which can adapt to current manufacturing capacity. A tolerance synthesis procedure is developed and integrated in tolerance design system for PKM. Comparing the results with peer method,the validity and practicability of this method is verified.

关键词： parallel kinematics mechanism(PKM) design of experiment(DOE) tolerance synthesis

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致病性大肠杆菌噬菌体筛选及其杀菌效果试验

辽宁农业职业技术学院学报 2025年第1期27卷 5-10页

作者：王跃儒梁德洁李建光刘衍芬李春艳辽宁农业职业技术学院辽宁营口115009

为大肠杆菌病的噬菌体防控应用提供技术支持,开展致病性大肠杆菌噬菌体筛选及其杀菌效果试验。具体方法:从辽宁某牛场牛奶中分离得到1株大肠杆菌EL4,对其进行染色镜检、细菌16S rRNA测序、动物致病性试验,以此分离菌为宿主菌筛选噬菌体... 详细信息

为大肠杆菌病的噬菌体防控应用提供技术支持,开展致病性大肠杆菌噬菌体筛选及其杀菌效果试验。具体方法:从辽宁某牛场牛奶中分离得到1株大肠杆菌EL4,对其进行染色镜检、细菌16S rRNA测序、动物致病性试验,以此分离菌为宿主菌筛选噬菌体,并对该噬菌体的杀菌效果进行了评估。结果表明:分离得到的EL4菌株在大肠杆菌伊红-美蓝、麦康凯选择鉴定性培养基上菌落形态和显微镜检结果均符合典型大肠杆菌特征;经16S rRNA基因PCR扩增、测序分析并构建系统发育树得知,该菌株与韩国鸡源APEC、美国牛源NADC、产志贺毒素的人源STEC三株大肠杆菌遗传进化关系均较近,同源性均达到99.65%;该菌株可以导致雏鸡腹泻、食欲不振、嗜睡、肝脏发黄、脾脏肿大出血直至死亡等临床症状和病理变化;以该菌株为宿主菌从牛场污水中筛选到一株清晰透亮、能产生晕环的噬菌体,命名为vB_EcoP_L4;噬菌体vB_EcoP_L4能在与宿主菌共培养3 h后迅速杀灭宿主菌,8 h内显示较强的杀菌效果,具防治致病性大肠杆菌病的潜力。

关键词：大肠杆菌噬菌体致病性杀菌试验

Accuracy Analysis for 6-DOF PKM with Sobol Sequence Based Quasi Monte Carlo Method

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Journal of Harbin Institute of Technology(New Series) 2015年第5期22卷 1-8页

作者： jianguang li Jian Ding lijie Guo Yingxue Yao Zhaohong Yi Huaijing Jing Honggen Fang School of Mechatronics Engineering Harbin Institute of Technology Shanghai Aerospace Equipments Manufacturer

To improve the precisions of pose error analysis for 6-dof parallel kinematic mechanism( PKM)during assembly quality control,a Sobol sequence based on Quasi Monte Carlo( QMC) method is introduced and implemented in pose accuracy analysis for the PKM in this paper. The Sobol sequence based on Quasi Monte Carlo with the regularity and uniformity of samples in high dimensions,can prevail traditional Monte Carlo method with up to 98. 59% and 98. 25% enhancement for computational precision of pose error *** a PKM tolerance design system integrating this method is developed and with it pose error distributions of the PKM within a prescribed workspace are finally obtained and analyzed.

关键词： accuracy analysis quasi monte carlo(QMC) sobol sequence parallel kinematic mechanism(PKM)

龙眼DELLAs基因家族的全基因组鉴定及生物信息学分析

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中国农学通报 2025年第5期41卷 30-38页

作者：吴凯彤黄石连王静李建光郭栋梁广东省农业科学院果树研究所/农业农村部南亚热带果树生物学与遗传资源利用重点实验室/广东省果树科学与技术研究重点实验室广州510640

DELLA蛋白是赤霉素信号通路的核心负调控因子,在植物与环境互作和调节植物生长发育方面具有重要的作用。本研究开展龙眼DELLAs基因家族(命名为DlDELLAs)的全基因组鉴定和生物信息学分析。利用前期获得的“鸡蛋本”龙眼基因组数据,搜索... 详细信息

DELLA蛋白是赤霉素信号通路的核心负调控因子,在植物与环境互作和调节植物生长发育方面具有重要的作用。本研究开展龙眼DELLAs基因家族(命名为DlDELLAs)的全基因组鉴定和生物信息学分析。利用前期获得的“鸡蛋本”龙眼基因组数据,搜索鉴定到10个DlDELLAs基因,分别分布在7条染色体上,均含有DELLA保守结构域。亚细胞定位分析发现DlDELLAs蛋白在细胞核、细胞质、叶绿体及内质网中均有分布。进化树分析显示10个龙眼DlDELLAs蛋白被分为5个亚族。顺式作用元件分析发现DlDELLAs基因上游启动子序列包含多个光响应、激素反应、胁迫反应以及植物生长发育相关的元件;DlDELLAs的表达水平在不同器官之间存在差异,大多数DlDELLAs基因在种子、根、茎和花中均有表达,而DlDELLA5、DlDELLA9、DlDELLA10分别只在叶片、种子、根中表达。以上研究丰富了我们对龙眼DlDELLAs基因家族的理解,为后续的基因功能研究奠定了基础。

关键词：龙眼赤霉素赤霉素信号通路 DELLAs基因家族光响应元件基因表达生物信息学

基于ANSYS WORKBENCH的漏斗翻板轴承座加固强度设计

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能源科技 2025年第1期23卷 80-82页

作者：李建光国能黄骅港务有限责任公司河北沧州061113

针对黄骅港主流皮带机转接塔漏斗翻板轴承座断裂后的应急处理情况,为快速恢复生产,应用三维模型软件进行实体设计,在强度和变形等问题上,应用大型通用有限元分析ANSYS WORKBENCH软件,对机械结构进行有限元分析,获取结构件的应力分布云... 详细信息

针对黄骅港主流皮带机转接塔漏斗翻板轴承座断裂后的应急处理情况,为快速恢复生产,应用三维模型软件进行实体设计,在强度和变形等问题上,应用大型通用有限元分析ANSYS WORKBENCH软件,对机械结构进行有限元分析,获取结构件的应力分布云图和总变形分布云图,并对设计结构进行数字化实验。

关键词：漏斗翻板轴承座加固强度设计

25 × 50 Gbps wavelength division multiplexing silicon photonics receiver chip based on a silicon nanowire-arrayed waveguide grating

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Photonics Research 2019年第6期7卷 659-663页

作者： ZHI liU JIASHUN ZHANG XIUli li liANGliANG WANG jianguang li CHUNLAI XUE JUNMING AN BUWEN CHENG State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of SciencesBeijing 100083 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049 China

A high-performance monolithic integrated wavelength division multiplexing silicon(Si) photonics receiver chip is fabricated on a silicon-on-insulator platform. The receiver chip has a 25-channel Si nanowire-arrayed waveguide grating, and each channel is integrated with a high-speed waveguide Ge-on-Si photodetector. The central wavelength, optical insertion loss, and cross talk of the array waveguide grating are 1550.6 nm, 5–8 dB, and-12 –-15 dB, respectively. The photodetectors show low dark current density of 16.9 mA∕cm^2 at-1 V and a high responsivity of 0.82 A/W at 1550 nm. High bandwidths of 23 and 29 GHz are achieved at 0 and-1 V, respectively. Each channel can operate at 50 Gbps with low input optical power even under zero bias,which realizes an aggregate data rate of 1.25 Tbps.

关键词： division chip Gbps optical bias has can dB

Fabrication of a novel silica PLC hybrid integrated triplexer

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Chinese Optics Letters 2010年第6期8卷 588-590页

作者：李俊一安俊明吴远大李建光王红杰胡雄伟 Optoelectronics Research and Development Center Institute of SemiconductorsChinese Academy of Sciences

A new-style silica planar lightwave circuit（PLC） hybrid integrated triplexer,which can demultiplex 1490- nm download data and 1550-nm download analog signals,as well as transmit 1310-nm upload data,is *** combines SiO2 arrayed waveguide gratings（AWGs） with integrated photodetectors（PDs） and a high performance laser diode（LD）.The SiO2 AWGs realize the three-wavelength coarse wavelength-division multiplexing（CWDM）.The crosstalk is less than - 40 dB between the 1490- and 1550-nm channels, and less than - 45 dB between 1310- and 1490- or 1550-nm *** the static performances of the integrated triplexer,its upload output power is 0.4 mW,and the download output photo-generated current is 76μ*** the small-signal measurement,the upstream -3-dB bandwidth of the triplexer is 4 GHz,while the downstream -3-dB bandwidths of both the analog and digital sections reach 1.9 GHz.

关键词： Bandwidth Optoelectronic devices Silica Waveform analysis Waveguides