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Research on Characters of Leaf Epidermal Cells' Quantities of Solanaceous Vegetable Crops

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Journal of Northeast Agricultural University(English Edition) 2010年第3期17卷 1-5页

作者： YU Longfeng AN Fuquan gao jinhe LI Fuheng Lincang Teachers College Lincang 677000 Yunnan China College of Life Sciences Northeast Agricultural University Harbin 150030 China

Tomatoes, peppers and eggplants＇ seedings were used as experiment materials to study the leaf development mechanism of solanaceous vegetable crops by using blot observation method. Results showed that an increasing trend was presented at the density of cells and stomata in upper and lower epidermis, but a declined trend was presented at the cells＇ diameters and the size of stomata with the joint position rising. At the same joint position, no matter in adaxial side or abaxial side, there were some differences among cells diameters, size of stomata, density of cells and stomata.

关键词： solanaceous vegetable crop leaf quantitative character

Construction Method of Deep-Buried Long-Length Tunnel

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Construction Method of Deep-Buried Long-Length Tunnel

Research progress of soft soil foundation treatment technology

作者： Ping Li Qingrui Lu Shijun Chen Renhui Dai jinhe gao Xiaoyi Jiang School of Civil and Architectural Engineering East China University of Technology State Key Laboratory of Nuclear Resources and Environment(East China University of Technology)

Grew up to solve the deep buried tunnels in the process of large diameter TBM excavation overexcavation problems and obstacles in a complex geological environment problems such as TBM, through the combination of drilling and blasting method and TBM at home and abroad were elaborated the expansion digging method of construction application, show that the drilling and blasting method and TBM method combined with the construction to prevent deep grew up section tunnel overbreak problems and improve resource utilization and avoid TBM card machine under complicated geological problems effectively.

关键词： Deep buried long tunnel overbreak card machine the construction method combined

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Research progress of soft soil foundation treatment technolo...

作者： Xiaoyi Jiang Qingrui Lu Shijun Chen Renhui Dai jinhe gao Ping Li School of Civil and Architectural Engineering East China University of Technology State Key Laboratory of Nuclear Resources and Environment(East China University of Technology)

With the extensive improvement of infrastructure in China in the past ten years,the soft soil foundation is becoming more and more ***,the improvement of soft soil foundation treatment has become a difficult problem that today’s engineering designers have to *** paper systematically reviews the development of soft soil foundation treatment technology in our country,and emphatically introduces the development process of foundation treatment at home and abroad,especially in our country in recent years,which embodies the cross and comprehensive application of various foundation treatment technologies and forms a unique composite reinforcement technology.

关键词： soft soil foundation treatment Overview Composite reinforcement technology Composite foundation

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高氏家族与云南佛教

曲靖师范学院学报 2013年第1期32卷 59-63页

作者：高金和临沧师范高等专科学校外语系云南临沧677000

高氏家族是云南历史上的一个名门望族。大理国时期,高氏家族世袭大理国宰相,分封高氏子弟统治大理国的八府四郡。元明清时期,高氏土司长期统治鹤庆、永胜、姚安三地。高氏家族笃信佛教,高氏家族大力出资在各地捐建寺庙,高氏家族中的不... 详细信息

高氏家族是云南历史上的一个名门望族。大理国时期,高氏家族世袭大理国宰相,分封高氏子弟统治大理国的八府四郡。元明清时期,高氏土司长期统治鹤庆、永胜、姚安三地。高氏家族笃信佛教,高氏家族大力出资在各地捐建寺庙,高氏家族中的不少重要成员还出家为僧。高氏家族对云南的佛教文化产生了深远的影响,云南的很多佛教名山都和高家有着深厚的历史渊源。

关键词：历史文化高氏家族云南佛教

Record-high efficiency perovskite LEDs achieved by accelerating radiative recombination

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Science China Materials 2024年第9期67卷 3039-3040页

作者： Feng gao Department of Physics Chemistry and BiologyLinköping UniversityLinköping58183Sweden

Light-emitting diodes(LEDs)have revolutionized the lighting and displays due to their superior energy *** increasing demand for more efficient and brighter thin-film LEDs in flat-panel displays and solid-state lighting applications has driven extensive research into perovskite materials,which show great promise for high brightness and efficiency.

关键词： lighting radiative high

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Stress tensor determination by modified hydraulic tests on pre-existing fractures:Method and stress constraints

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第5期16卷 1637-1648页

作者： Guiyun gao Chenghu Wang Ke gao National Institute of Natural Hazards Ministry of Emergency Management of ChinaBeijing100085China Beijing Engineering Research Center of Earthquake Observation Beijing100085China Key Laboratory of Compound and Chained Natural Hazards Dynamics Ministry of Emergency Management of ChinaBeijing100085China Department of Earth and Space Sciences Southern University of Science and TechnologyShenzhen518055China

The hydraulic testing of pre-existing fractures(HTPF)is one of the most promising in situ stress measurement methods,particularly for three-dimensional stress tensor ***,the stress tensor determination based on the HTPF method requires at least six tests or a minimum of 14-15 tests(under different conditions)for reliable *** this study,we modified the HTPF method by considering the shear stress on each pre-existing fracture,which increased the number of equations for the stress tensor determination and decreased the number of tests *** shear stresses were attributed to different fractures by random sampling;therefore,the stress tensors were obtained by searching for the optimal solution using the least squares criterion based on the Monte Carlo ***,we constrained the stress tensor based on the tensile strength criterion,compressive strength criterion,and vertical stress *** inverted stress tensors were presented and analyzed based on the tensorial nature of the stress using the Euclidean mean stress *** stress-measurement campaigns in Weifang(Shandong Province,China)and Mercantour road tunnel(France)were implemented to highlight the validity and efficiency of the modified HTPF(M-HTPF)*** results showed that the M-HTPF method can be applied for stress tensor inversion using only three to four tests on pre-existing fractures,neglecting the stress *** inversion results were confined to relatively small distribution dispersions and were significantly reliable and stable due to the shear stresses on the fractures and the stress constraints *** M-HTPF method is highly feasible and efficient for complete stress tensor determination in a single borehole.

关键词： Stress tensor Hydraulic tests on pre-existing fractures Mean stress Stress constraint Hydraulic fracturing

Thermal and mechanical behavior of casting copper alloy wheel during wheel and belt continuous casting process

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China Foundry 2024年第1期21卷 82-90页

作者： Kun gao Yan Peng School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina

To investigate the thermal and mechanical behavior of casting wheel,a two-dimensional thermoelastic-plastic finite element model was used to predict the temperature,stress and distortion distribution of the casting wheel during the wheel and belt continuous casting *** effects of grinding thickness and casting speed on the thermal and mechanical behaviors of the center of the hot face of the casting wheel were discussed in *** each rotation,the casting wheel passes through four different spray *** results show that the temperature distribution of the casting wheel in different spray zones is similar,the temperature of the hot face is the highest and the temperature reaches the peak in the spray zoneⅢ.The stress and distortion depend on the temperature distribution,and the maximum stress and distortion of the hot face are 358.2 MPa and 1.82 mm,*** temperature at the center of the hot face decreases with increasing grinding thickness and increases with increasing casting speed.

关键词： casting wheel finite element model grinding thickness casting speed hot face spray zones

Numerical simulation of fluid flow and free surface fluctuations during wheel and belt casting process

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Journal of Iron and Steel Research International 2024年第5期31卷 1117-1126页

作者： Kun gao Yan Peng National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao066004HebeiChina

The unstable fluid flow and severe free surface fluctuations in the wheel and belt caster can affect the quality of the cast *** lower level height tends to entrap inclusions in the molten *** the other hand,the higher level height makes the production process more dangerous due to the overflow of high temperature fluid from the mold.A computational model of the molten metal pouring process was *** transient fluid flow and free surface fluctuations behavior were calculated using the three-dimensional large eddy simulation model and the volume of fluid *** results show that the flow velocity of the main jet gradually decreases under the influence of the low kinetic energy fluid in the *** is an obvious oscillation in the tail of the jet,while the flow field is asymmetric in *** jet is closer to the inside radius side due to the Coanda effect,and there is a recirculation zone on the inside radius and the outside radius respectively,according to the 10 s time-averaged *** with the industrial observation and simulation results,the shape of the free surface is a wave that varies with *** addition,the free surface height is lowest and the flow velocity is highest in the region near the jet.

关键词： Fluid flow Free surface Wheel and belt caster Large eddy simulation Volume of fluid method

On the core entropy of Newton maps

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Science China Mathematics 2024年第1期67卷 77-128页

作者： Yan gao Department of Mathematics Shenzhen UniversityShenzhen 518060China

In this paper,we define the core entropy for postcritically-finite Newton maps and study its continuity within this *** show that the entropy function is not continuous in this family,which is different from the polyn... 详细信息

关键词： core entropy extended Newton graph critical marking polynomial Newton map