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Discussion on the Safe and Guaranteed Access of Interchange Widening in Reconstruction and Extension of Highway

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Journal of Architectural Research and Development 2021年第2期5卷 55-58页

作者： Heng Zhang Xuguang zheng jing Zhou China Merchants Chongqing Communications Technology Research&Design Institute Co. Ltd.Chongqing 400067China

In the process of reconstruction and extension of highways,the most important thing is to ensure that the overall level of the widening of interchanges is comprehensively improved to ensure safe ***,due to the heavy and difficult tasks in the widening of interchanges,higher requirements are put forward for the construction quality of the *** the actual construction of the project,it is necessary to actively analyze and explain the specific construction of the interchange widening project to ensure that the improvement level of the interchange widening in highway reconstruction and extension project is effectively *** paper gives a detailed introduction to the main construction technology for interchange widening project,clarifies the technical points of safety and guaranteed access,and proposes corresponding safeguard measures to ensure the comprehensive upgrade of the construction quality and standard of interchange widening in highway reconstruction and extension.

关键词： Expressway reconstruction and extension project Widening of interchange Safety and guaranteed access

水泥搅拌桩复合地基的承载力与破坏模式研究（英文）

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2018年第4期19卷 266-276页

作者： Hai-zuo ZHOU Gang zheng Xiao-xuan YU Tian-qi ZHANG jing-jin LIU School of Civil Engineering Tianjin University Key Laboratory of Coastal Civil Engineering Structure and Safety of Ministry of Education Tianjin University State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University

目的:工程规范中采取保守设计方法导致含有埋深的复合地基的承载力被严重低估。本文基于设计表格的方法展示水泥搅拌站复合地基的承载力系数(N_c、N_q和N_γ),分析埋深存在时的3种破坏模式,探讨承载力系数N_q和破坏模式随着各类因素(桩... 详细信息

目的:工程规范中采取保守设计方法导致含有埋深的复合地基的承载力被严重低估。本文基于设计表格的方法展示水泥搅拌站复合地基的承载力系数(N_c、N_q和N_γ),分析埋深存在时的3种破坏模式,探讨承载力系数N_q和破坏模式随着各类因素(桩长、置换率和埋置深度)变化的原因。创新点:1.确定简化的均质化水泥搅拌桩加固地基模型;2.建立非连续布局优化法(DLO)模型,计算工程实用设计表格;3.分析极限承载力系数N_q、破坏模式和各类影响因素的内在关联。方法:1.通过等效强度法确定合理的均质化数值计算模型,并与群桩模型和前人研究进行对比验证(图4和表1);2.通过极限分析上限解结合非连续布局优化法,进行大量计算,建立极限承载力系数的设计表格(图6~8)。结论:1.对于无埋深工况,承载力系数N_c随着置换率的增长而增大,直到某一临界值,此时发生实体基础破坏。2.在置换率较低时,承载力系数N_γ随着置换率的增长而减小,因为此时加固区内的等效内摩擦角减小。3.埋置深度对承载力和破坏模式产生复杂影响;当破坏模式从实体基础转化为复合型破坏时,N_q增长;随着桩长进一步增加,破坏面通过加固区内部时,N_q在减小之后保持不变。

关键词：承载力水泥搅拌桩埋置深度破坏模式

Na_2SrP_2O_7∶Sm^(3+)橙色荧光粉的制备与发光性能的研究

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人工晶体学报 2015年第5期44卷 1233-1239页

作者：刘峥张菁谢思维周诗灿桂林理工大学化学与生物工程学院桂林541004

利用稀土离子Sm3+作为激活剂,采用传统的高温固相法制备了Na2Sr P2O7∶χSm3+(χ=0.02mol%)橙色荧光粉。用扫描电镜、X射线衍射仪和荧光分光光度计对粉体的表面形貌、晶体结构和荧光光谱进行了表征。XRD分析和荧光光谱分析得出:最佳的... 详细信息

利用稀土离子Sm3+作为激活剂,采用传统的高温固相法制备了Na2Sr P2O7∶χSm3+(χ=0.02mol%)橙色荧光粉。用扫描电镜、X射线衍射仪和荧光分光光度计对粉体的表面形貌、晶体结构和荧光光谱进行了表征。XRD分析和荧光光谱分析得出:最佳的烧结温度为700℃。该荧光粉能够被404 nm光高效激发,发射光谱在可见光区呈三峰发射,峰值位于564 nm、603 nm、647 nm,其最强发射峰位于603 nm处,对应于Sm3+的4G5/2→6H7/2特征发射。设定发射波长为603 nm,得到荧光粉的激发光谱为一个主峰位于404 nm的宽带激发峰,表明该荧光粉可被紫外光和近紫外光有效地激发。研究了Sm3+掺杂浓度和助熔剂NH4Cl含量对Na2Sr P2O7∶Sm3+橙色荧光粉荧光性能的影响,得出Sm3+的最佳掺杂量为2mol%。3wt%的助熔剂NH4Cl有利于荧光粉颗粒的分散,减小平均粒径,改善晶粒形貌,提高荧光粉的相对发光强度,还能降低制备所需的温度。

关键词：高温固相法 Na2SrP2O7∶Sm3+ 橙色荧光粉 NH4Cl 发光性能

Bio-inspired artificial cilia with magnetic dynamic properties

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Frontiers of Materials Science 2015年第2期9卷 178-184页

作者： Leilei SUN Yongmei zheng Key Laboratory of Bio-lnspired Smart Interfacial Science and Technology of the Ministry of Education School of Chemistry and Environment Beihang University Beijing 100191 China

Inspired by the structure and properties of natural cilia, we focused on a facile template-free approach to prepare magnetic artificial cilia grown on the substrate （glass, PDMS, or others）. In an applied magnetic field, the cilia formed spontaneously and immediately from magnetic nanoparticles and elastomeric polymer in a liquid solvent by bottom-up self-assembly. The length of prepared cilia could be in the scale of millimeter and reach a high aspect ratio of even over 100. We studied the effect of the magnetic strength applied and the size of nanoparticles to get tunable scale of cilia. The cilia show reversibly bending in an external magnetic field and this bending actuation gave some important functions： to transport macroscopic nonmagnetic materials on the cilia and to mix liquids.

关键词： artificial cilia magnetic nanoparticle actuation liquids mixing

Influence of the Metal Ions on the Allylic Rearrangement Reac- tion of 3,4,5,6-Tetrahydrophthalic Anhydride

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Chinese Journal of Chemistry 2015年第12期33卷 1347-1352页

作者： Yuanchao Pang Yanzhen zheng Center for Applied Chemical Research Frontier Institute of Science and Technology and MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter College of Science Xi'an Jiaotong University Xi'an Shannxi 710054 China

To further investigate the influence of metal ions on the allylic rearrangement of 3,4,5,6-tetrahydrophthalic an- hydride during the hydrothermal reaction, metal ions such as manganese（Ⅱ）, zinc（Ⅱ） and cadmium（Ⅱ） have been employed in the synthesis, which leads to the formation of three new lamellar coordination polymers, [MnⅡs（μ3-OH）3（1-chec）（1,2-chedc）（2,3-chedc）2（H20）] （3Mn）, [ZnⅡs（μ3-OH）3（1-chec）（1,2-chedc）（2,3-chedc）2（H20）] （4Zn）, and [CdⅡ3（μ3-OH）2（1,2-chedc）2] （5Cd）（1-chec=cyclohexene-l-carboxylate, 1,2-chedc=cyclohexene-1,2- dicarboxylate, 2,3-chedc=cyclohexene-1,2-dicarboxylate）. Interestingly, the allylic rearrangement reaction is metal-dependent, which occurs only in 3Mn and 4Zn, resulting in the formation of one chiral carbon atom of the corresponding dicarboxylate ligands in both compounds. In addition, the magnetic property of compound 3Mn was studied, which revealed strong antiferromagnetic interactions between the metal centers.

关键词： metal-dependent allylic rearrangement solvothermal reaction antiferromagnetic interaction

Partial Charging of Capacitors for Improving Voltage Profiles of CSI Fed Motor Drives

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Chinese Journal of Electrical Engineering 2020年第4期6卷 77-85页

作者： zheng Wang Yang Xu School of Electrical Engineering Southeast UniversityNanjing 210096China

The fast switching behaviors of wide bandgap devices bring some challenges such as high du/dt and limited short-circuit current withstand capability to the reliable operation of the motor *** current-source-inverter(CSI)provides a promising solution in mitigating those challenges by owning the DC-link choke,the reverse-voltage blocking switches and AC commutation *** further reduce du/dt on switches of CSI fed motor drives,the technique of partial charging of capacitors have been investigated in this *** designing the series-connected and the parallel-connected partial-charging circuit for capacitors in DC-link,the voltage profile of CSI could be ***,the zero-voltage-switching(ZVS)is achieved for main power switches,the du/dt is reduced and the overvoltage protection is *** working mechanism of the technique of partial charging of capacitor is described and one example is discussed on the dual three-phase motor *** experimental verification is presented to show the performance of partial charging technique for improving voltage profile of CSI fed motor drives.

关键词： Current source inverter partial charging voltage profile zero-voltage switching overvoltage protection

Effects of different forms of yeast Saccharomyces cerevisiae on growth performance,intestinal development,and systemic immunity in early-weaned piglets

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Journal of Animal Science and Biotechnology 2016年第1期7卷 78-85页

作者： Zongyong Jiang Shaoyong wei Zhilin Wang Cui Zhu Shenglan Hu Chuntian zheng Zhuang Chen Youjun Hu Li Wang Xianyong Ma Xuefen Yang Key Laboratory of Animal Nutrition and Feed(South China) Ministry of Agriculture of ChinaState Key Laboratory of Livestock and Poultry BreedingGuangdong Public Laboratory of Animal Breeding and NutritionInstitute of Animal ScienceGuangdong Academy of Agricultural Sciences Agro-biological Gene Research Center Guangdong Academy of Agricultural Sciences

The present study was conducted to determine effects of different forms of yeast （Saccharomyces cerevisiae, strain Y200007） on the growth performance, intestinal development, and systemic immunity in early-weaned piglets. A total of 96 piglets （14-d old, initial average body weight of 4.5 kg） were assigned to 4 dietary treatments：（1） basa diet without yeast （Control）; （2） basal diet supplemented with 3.00 g/kg live yeast （LY）; （3） basal diet supplemented with 2.66 g/kg heat-killed whole yeast （HKY）; and （4） basal diet supplemented with 3.00 g/kg superfine yeast powders （SFY）. Diets and water were provided ad libitum to the piglets during 3-week experiment. Growth performance of piglets was measured weekly. Samples of blood and small intestine were collected at days 7 and 21 of experiment. Dietary supplementation with LY and SFY improved G：F of piglets at days ]-21 of the experiment （P 〈 0.05） compared to Control group. Serum concentrations of growth hormone （GH）, triiodothyronine （T3）, tetraiodothyronine （T4）, and insulin growth factor 1 （iGF-1） in piglets at day 21 of the experiment were higher when fed diets supplemented with LY and SFY than those in Control group （P 〈 0.05）. Compared to Control group, contents of serum urea nitrogen of piglets were reduced by the 3 yeast-supplemented diets （P 〈 0.05）. Diets supplemented with LY increased villus height and villus-to-crypt ratio in duodenum and jejunum of piglets （P 〈 0.05） compared to other two groups at day 7 of the experiment. Feeding diets supplemented with LY and SFY increased （P 〈 0.05） serum concentrations of IgA, IL-2, and IL-6 levels in piglets compared to Control. The CD4＋/CD8＋ ratio and proliferation of T-lymphocytes in piglets fed diets supplemented with LY were increased compared to that of Control group at day 7 of the experiment （P 〈 0.05）. In conclusion, dietary supplementation with both LY and SFY enhanced feed conversion, small intestinal development, and systemic immunity in early-weaned piglets

关键词： Growth performance Immunity Intestinal development Piglets Saccharomyces cerevisiae Yeast

Inhibitory Effects of Cypermethrin on Interactions of the Androgen Receptor with Coactivators ARA70 and ARA55

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Biomedical and Environmental Sciences 2020年第3期33卷 158-164页

作者： DING Zhen SHEN Jun Yu HONG Jia wei ZHANG Rui LI zheng WANG Qi ZHANG Jin Peng ZHANG Mei Rong XU Li Chun School of Public Health Xuzhou Medical UniversityXuzhou 221000JiangsuChina

Objective The purpose of this study was to investigate the anti-androgenic mechanism of cypermethrin involving *** Mammalian two-hybrid assays were performed to study the effects of cypermethrin on interactions of the androgen receptor(AR)with the coactivators androgen receptor-associated protein70(ARA70)and androgen receptor-associated protein 55(ARA55).Results The results showed that AR–ARA70 and AR–ARA55 interactions were remarkably enhanced by dihydrotestosterone(DHT,P≤0.05).Cypermethrin inhibited DHT-induced AR–ARA70 and AR–ARA55 interactions significantly(P≤0.05).Conclusion The study indicates that cypermethrin exhibits inhibitory effects on AR transcription associated with repression of AR–ARA70 and AR–ARA55 interactions in a ligand-dependent *** data show novel anti-androgenic mechanisms of cypermethrin that contribute to male reproductive toxicology.

关键词： Cypermethrin Androgen receptor signaling Androgen receptor-associated protein 70 Androgen receptor-associated protein 55

Differentiation potential of human adipose tissue derived stem cells into photoreceptors through explants culture and enzyme methods

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International Journal of Ophthalmology(English edition) 2017年第1期10卷 23-29页

作者： wei-wei Xu Li Huang Kelvin K.L.Chong Doreen S.Y.Leung Benjamin EL.Li zheng-Qin Yin Yi-Fei Huang Chi Pui Pang Department of Ophthalmology and Visual Sciences theChinese University of Hong KongHong Kong 999077China Department of Ophthalmology Chinese People's LiberationArmy General HospitalBeijing 100853China

AIM： To investigate the retinal photoreceptor differentiation potential of human orbital adipose tissue-derived stem cells （ADSCs） generated by enzyme （EN） and explant （EX） culture ***： We investigated potentials of human orbital ADSCs to differentiate into photoreceptors through EN and EX culture methods. EN and EX orbital ADSCs were obtained from the same donor during rehabilitative orbital decompression, and then were subject to a 3-step induction using Noggin, DKK-1, IGF-1 and b-FGF at different time points for 38d. Stem cell, eye-field and photoreceptor-related gene and protein markers were measured by reverse transcription-polymerase chain reaction （RT-PCR） and immunofluorescent （IMF） ***： Both EX and EN orbital ADSCs expressed CD133, a marker of cell differentiation. Moreover, PAX6 and rhodopsin, markers of the retinal progenitor cells, were detected from EX and EN orbital ADSCs. In EX orbital ADSCs, PAX6 mRNA was detected on the 17th day and then the rhodopsin mRNA was detected on the 24th day. In contrast, the EN orbital ADSCs expressed PAX6 and rhodopsin mRNA on the 31st day. EX orbital ADSCs expressed rhodopsin protein on the 24th day, while EN orbital ADSCs expressed rhodopsin protein on the 31st day. CONCLUSION： Orbital ADSCs isolated by direct explants culture show earlier and stronger expressions of markers towards eye field and retinal photoreceptor differentiation than those generated by conventional EN method.

关键词： photoreceptor cells cell differentiation adultstem cells tissue engineering explants culture enzymaticdigestion