检索结果-南通市图书馆

Design and experimental investigation of potential low-thermalconductivity high-entropy rare-earth zirconates

Journal of Advanced Ceramics 2024年第8期13卷 1132-1142页

作者： Lu Liu Hongying Dong Peng Zhang shaokun wang Haolei Qil Mengyu Ding Zhefeng Li Yu Bai Wen Ma School of Chemical Engineering Inner Mongolia University of TechnologyHohhot 010051China Inner Mongolia Key Laboratory of Thin Film and Coatings School of Materials Science and EngineeringInner Mongolia University of TechnologyHohhot 010051China

Developing new high-entropy rare-earth zirconate(HE-RE_(2)Zr_(2)O_(7))ceramics with low thermal conductivity is essential for thermal barrier coating *** this work,the average atomic spacings,interatomic forces,and average atomic masses of 16 rare-earth elements occupying the A site of the cubic A_(2)B_(2)O_(7) crystal structure were calculated by density functional *** three physical qualities,as vectors,characterize the corresponding rare-earth *** distance between two vectors quantitatively describes the difference between two rare-earth *** greater differences between two rare-earth elements,the disorder degree of HE-RE_(2)Zr_(2)O_(7)is greater,and therefore,the thermal conductivity is *** to the theoretical calculations,the thermal conductivity of the ceramics gradually increases in the order of(SC_(0.2)Y_(0.2)La_(0.2)Ho_(0.2)Yb_(0.2))_(2)Zr_(2)0_(7),(SC_(0.2)Ce_(0.2)Nd_(0.2)Eu_(0.2)Gd_(0.2))_(2)Zr_(2)0_(7),(SC_(0.2)Y_(0.2)Tm_(0.2)Yb_(0.2)Lu_(0.2))_(2)Zr_(2)0_(7),and(Sc_(0.2)Er_(0.2)Tm_(0.2)Yb_(0.2)Lu_(0.2))_(2)Zr_(2)O_(7).Using the solution precursor plasma spray method and pressureless sintering method,four types of HE-RE2Zr2Oz powder and bulk samples were *** samples all showed a single defective fluorite structure with a uniform distribution of the elements and a stable phase *** thermal conductivities of the sintered HE-RE_(2)Zr_(2)0_(7) bulk samples ranged from 1.30 to 1.45 Wm^(-1).K^(-1) at 1400℃,and their differences were consistent with the theoretical calculation *** the ceramics,(Sc_(0.2)Y_(0.2)La_(0.2)Ho_(0.2)Yb_(0.2))_(2)Zr_(2)O_(7) had the lowest thermal conductivity(1.30 W·m^(-1)·K^(-1),1400℃),highest thermal expansion coefficient(10.19×10^(-6) K^(-1),200-1400℃),highest fracture toughness(1.69±0.28 MPa·m^(1/2)),and smallest brttleness index(3.03μm^(1/2)).Therefore,(Sc_(0.2)Y_(0.2)La_(0.2)Ho_(0.2)Yb_(0.2))_(2)Zr_(2)0_(7)is considered to be an ideal candidate material for

关键词： high-entropy ceramics rare-earth zirconate(HE-RE_(2)Zr_(2)O_(7)) composition design thermal conductivity thermal barriercoatings(TBCs)

来源：

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

唐菖蒲蛋白磷酸酶GhPP2C1基因功能及其对ABA的响应

引用

中国农业大学学报 2024年第3期29卷 113-124页

作者：王少坤李静如刘晨义鸣放吴健中国农业大学园艺学院/花卉发育与品质调控北京市重点实验室北京100193

为探究唐菖蒲GhPP2C1(Protein phosphatase 2C1)的功能及对脱落酸(Abscisic acid,ABA)的响应,以唐菖蒲‘Rose Supreme’为试材,利用同源克隆的方法获得ABA信号转导过程中的关键蛋白磷酸酶基因GhPP2C1,利用实时荧光定量分析、亚细胞定位... 详细信息

为探究唐菖蒲GhPP2C1(Protein phosphatase 2C1)的功能及对脱落酸(Abscisic acid,ABA)的响应,以唐菖蒲‘Rose Supreme’为试材,利用同源克隆的方法获得ABA信号转导过程中的关键蛋白磷酸酶基因GhPP2C1,利用实时荧光定量分析、亚细胞定位和启动子β-葡萄糖苷酸酶(GUS)染色等方法检测其对ABA的响应情况;对其启动子序列进行响应元件分析;在拟南芥中异源过表达GhPP2C1基因,对转基因株系进行ABA敏感性测定、株型分析及下游基因表达情况分析。结果表明:1)GhPP2C1的表达在ABA处理的诱导下显著上调。2)GhPP2C1定位于细胞质中,可被ABA处理诱导入核。3)GhPP2C1基因启动子包含ABA、赤霉素(Gibberellins,GAs)、干旱和低温相关响应元件。在烟草叶片和拟南芥根尖中,GhPP2C1启动子活性可被ABA激活。4)在拟南芥中异源过表达GhPP2C1基因导致ABA信号通路中下游基因的表达量显著下降并出现分枝数、株高和种荚数量明显增加的表型。综上,推测唐菖蒲GhPP2C1可能通过减弱ABA信号传导,促进种子休眠解除,且在植株营养生长过程中也发挥作用。

关键词：唐菖蒲 GhPP2C1 脱落酸异源转化拟南芥

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Inhibiting effect of[HOEmim][BF_4]and[Amim]Cl ionic liquids on the cross-linking reaction of bituminous coal

引用

International Journal of Mining Science and Technology 2016年第2期26卷 353-359页

作者： wang Lanyun Xu Yongliang wang shaokun Song Zhipeng State Key Laboratory Cultivation Base for Gas Geology and Gas Control Henan Polytechnic University State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology

In order to reduce the hazard of coal spontaneous combustion,the cross-linking reaction between O-containing functional groups of coal should be *** the inhibitory effect of an ionic liquid(IL) on the cross-linking reaction was *** O-containing functional groups change the weight loss and H_2O,CO_2,CO yields of bituminous coal before and after[H0Emim][BF_4]and[Amim]Cl pre-treatment and were detected by Fourier Transform Infrared spectroscopy(FT1R) and Thermo Gravimetric(TC) *** results show that | AmimjCI has a weaker ability to inhibit the cross-linking reaction of bituminous coal compared to[HOEmim][BF_4].Besides,based on Quantum Chemistry calculation,it was found that the different inhibiting effects of |H0Emim][BF_4]and[Amim]Cl are greatly related to their anions and the H linked with C2 atom on the imidazole *** H-donor ability of coal will be enhanced by[HOEmim][BF_4]leading to a weaker cross-linking reaction of coal.

关键词： Ionic liquid Inhibit Cross-linking reaction Bituminous coal

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

高重复频率谐波自锁模Nd∶YVO_(4)激光器实验特性研究

引用

中国激光 2024年第7期51卷 217-226页

作者：王劭昆胡淼许蒙蒙姬莹莹厉泽荣李浩珍毕美华周雪芳杭州电子科技大学通信工程学院浙江杭州310018

研究了高重复频率的谐波自锁模Nd∶YVO_(4)激光器。理论证明了当增益介质与谐振腔的光学长度的比值接近最简分数时,激光器的纵模模式间距可以被修改为增益介质自由光谱范围的整数倍,并对应谐波锁模脉冲输出。开展了相关实验,结果表明,... 详细信息

研究了高重复频率的谐波自锁模Nd∶YVO_(4)激光器。理论证明了当增益介质与谐振腔的光学长度的比值接近最简分数时,激光器的纵模模式间距可以被修改为增益介质自由光谱范围的整数倍,并对应谐波锁模脉冲输出。开展了相关实验,结果表明,当泵浦功率为6.57 W,增益介质和谐振腔的光学长度分别为11.0 mm和25.8 mm时,对应最简分数为3/7,获得了3倍增益介质自由光谱范围的模式间距纵模分布,对应谐波锁模脉冲的重复频率为40.92 GHz,平均输出功率为790.7 mW。实验还发现,当固定增益介质的光学长度时,获得的谐波锁模脉冲输出对应的谐振腔腔长存在锁定范围,进一步验证了谐振腔腔长锁定范围与增益介质的光学长度成正比。

关键词：激光器激光技术 Nd∶YVO_(4)晶体高重复频率谐波锁模

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Scale dependence of plant species richness and vegetation-environment relationship along a gradient of dune stabilization in Horqin Sandy Land, Northern China

引用

Journal of Arid Land 2014年第3期6卷 334-342页

作者： XiaoAn ZUO shaokun wang XueYong ZHAO Jie LIAN Naiman Desertification Research Station Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences Laboratory of Stress Ecophysiology and Biotechnology Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences

Ecological patterns and processes in dune ecosystems have been a research focus in recent years, however the information on how dune stabilization influences the spatial scale dependence of plant diversity is still lacking. In this study, we measured the plant species richness, soil properties and altitude across four spatial scales （1, 10, 100 and 1,000 m2） at three different dune stabilization stages （mobile dune, semi-fixed dune and fixed dune） in Horqin Sandy Land, Northern China. We also examined the relationships between plant species richness, community composition and environmental factors along the gradient of dune stabilization. Our results showed that plant species richness increased with the increase of spatial scales in each dune stabilization stage, as well as with the increase of dune stabilization degrees. Canonical correspondence analysis （CCA） showed that plant distribu- tions in the processes of dune stabilization were determined by the combined environmental gradient in relation to soil organic carbon （SOC）, total nitrogen （TN）, carbon/nitrogen （C/N）, pH, electrical conductivity （EC）, soil water content （SWC）, fine sand （FS）, very fine sand （VFS）, silt and clay （SC）, and altitude. Plant species richness was significantly and positively correlated to SOC and TN in mobile dune, and significantly and positively correlated to SOC, TN, C/N, VFS and SC in semi-fixed dune. However, no significant correlation between plant species richness and environmental factors was observed in fixed dune. In addition, plant species richness in different dune stabili- zation stages was also determined by the combined gradient of soil properties and altitude. These results suggest that plant species richness has obvious scale dependence along the gradient of dune stabilization. Soil resources depending on dune habitats and environmental gradients caused by dune stabilization are important factors to de- termine the scale dependence of species diversity in sand dune eco

关键词： CCA environmental gradient sandy land ecosystem spatial scale dependence species diversity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

System Design For Aircraft Fuel Control And Maintenance Test-bed

System Design For Aircraft Fuel Control And Maintenance Test...

引用

第26届中国控制与决策会议

作者： Zhang Chuntang wang shaokun College of Automation and Electronic Engineering Qingdao University of Science ＆ Technology

ISBN: (纸本)9781479937066

The fuel system is one of the most important component parts of aircraft and plays a vital role for the smooth implementation of the safety of aircraft mission. The platform uses computer software and hardware simulation technology（Making combination of software and hardware simulation which not only covers troubleshooting content requirements but also avoids assembling Air Material）.The working principle of the fuel control system,power check, troubleshooting and field repair process can be simulated by the system. So it could be utilized to train the students repairing ability and also as a meaningful assessment method to evaluate the trainees.

关键词： Aircraft fuel system Process control Troubleshooting Simulation test

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Land cover changes and the effects of cultivation on soil properties in Shelihu wetland,Horqin Sandy Land,Northern China

引用

Journal of Arid Land 2013年第1期5卷 71-79页

作者： Jie LIANI XueYong ZHAO XiaoAn ZUO shaokun wang XinYuan wang YongQing LUO Naiman Desertification Research Station Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China University of Chinese Academy of Sciences Beijing 100049 China

Land cover change plays an essential role in the alternation of soils properties. By field investigation and applying satellite images, land cover information in the Shelihu wetland was carried out in an area of 2,819 hm2 in 1985, 1995, 2000, 2005, 2010 and 2011, respectively, in Horqin Sandy Land. A total of 57 soil sampling sites across Shelihu were chosen in wet meadow （CL0）, cropland （CL） and sandy land （SL） according to the spatial characteristics of water body change. Soil texture, organic carbon （SOC）, total nitrogen （TN） and total phosphorus （TP） contents, electrical conductivity （EC） and pH were measured at the soil depths of 0-10, 10-20 and 20-40 cm to examine the influence of agricultural conversion and continuous cultivation on soil properties. The results showed that the study area was covered by water body in 1985, which gradually declined afterwards and then reclaimed rapidly at a mean annual rate of 132.1 hm2/a from wet meadow to cropland since 1995. In 2011, water body was drained and the area was occupied by 10.8% of CL0, 76.9% of CL and 12.3% of SL. Large amounts of SOC, TN and TP were accumulated in the above depths in CL0. Soil in CL0 also had higher EC and silt and clay fractions, lower pH than in SL and CL. Soil in SL was seriously degraded with lower contents of SOC, TN and TP than in CL and CL0. SOC, TN content and EC in CL decreased with the increase of cultivation age, while pH showed a reverse trend with significance at plough horizon. The agricultural conversion in Shelihu was driven by the comprehensive factors of precipitation reduction, economic development and intense competitions for irrigation water. Continuous cultivation in this process is not sustainable because of SOC degradation and nutrient content reduction. The key point is that conventional tillage and removal of residuals induced further land degradation. Wetland reclamation for immediate economic interests led to greater costs in the long-term environmental restoration i

关键词： wetland soil degradation wetland reclamation continuous cultivation Horqin Sandy Land

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Variation in soil water content to rainfall under Caragana microphylla shrub in Horqin Sandy Land

引用

Journal of Arid Land 2010年第3期2卷 174-179页

作者： wang, shaokun Zhao, XueYong Qu, Hao Luo, YaYong Yun, JianYing Chinese Acad Sci Naiman Desertificat Res Stn Cold & Arid Reg Environm & Engn Res Inst Lanzhou 730000 Peoples R China Chinese Acad Sci Grad Univ Beijing 100039 Peoples R China

In order to investigate the spatio-temporal variability of soil water content to rainfall under Caragana microphylla shrub in Horqin Sandy Land,a plot of 25 m × 25 m,where there were 6 shrub canopies of C. microphylla,was sited for measuring soil water content at two soil layers of 0-20 cm (top layer) and 20-40 cm (lower layer). Soil water content was measured on the 1st,5th,10th and 15th day after a 42 mm rainfall in Naiman of Inner Mongolia. The results showed that soil water contents at both layers under C. microphylla shrub were gradually decreased after the rain. Soil water content at the top layer outside the shrub canopy was higher than that inside the shrub canopy within 5 days,and became similar inside and outside the shrub canopy on the 10th day after the 42 mm rainfall,and it was lower outside than that inside the shrub canopy on the 15th day. The soil water content at lower layer in the area without shrubs was higher than that under shrub canopy all along. All the measured values of soil water content can be fitted to a variogram model. There was significant autocorrelation of the values of soil water content between top layer and lower layer,except for the fourth measured values of soil water content at top layer. The range and spatial dependence of soil water content at top layer were lower than that at lower layer.

关键词： Horqin Sandy Land Caragana microphylla soil water content spatial variability

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

可调谐脉宽的全固态自锁模突发脉冲激光器

引用

光通信技术 2024年第4期48卷 58-62页

作者：厉泽荣胡淼许蒙蒙王劭昆周雪芳毕美华杭州电子科技大学通信工程学院杭州310018

针对目前脉冲激光器产生突发脉冲功率低、装置复杂等问题,设计一种可调谐脉宽的全固态自锁模突发脉冲激光器,理论分析了腔内法布里-珀罗(F-P)结构的自锁模激光器的突发脉冲产生机理,建立了自锁模突发脉冲激光器的理论模型。实验结果表明... 详细信息

针对目前脉冲激光器产生突发脉冲功率低、装置复杂等问题,设计一种可调谐脉宽的全固态自锁模突发脉冲激光器,理论分析了腔内法布里-珀罗(F-P)结构的自锁模激光器的突发脉冲产生机理,建立了自锁模突发脉冲激光器的理论模型。实验结果表明:随着激光晶体长度的增加,突发脉冲的脉宽变宽;当激光晶体长度为5 mm、泵浦光功率为5.5 W时,获得了光束质量因子为1.42的突发脉冲,突发脉冲的重复频率为13.64 GHz,最大平均输出功率0.78 W,对应的斜效率和光光转化率分别为9.57%和8.73%。

关键词：自锁模激光器 Nd:YVO_(4) 突发脉冲纵模模式分布

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Impact of sand burial on maize(Zea mays L.)productivity and soil quality in Horqin sandy cropland,Inner Mongolia,China

引用

Journal of Arid Land 2016年第4期8卷 569-578页

作者： wang shaokun ZHAO Xueyong ZHAO Halin LIAN Jie LUO Yongqing YUN Jianying Naiman Desertification Research Station Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences Laboratory of Stress Ecophysiology and Biotechnology Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences

Croplands are often suffering from sand burial in dry regions of northern China. For studying this phenomenon, we carried out a case study of field experiment including four sand burial levels, i.e. shallow （1-3 cm）, moderate （8-12 cm） and deep （15-20 cm） sand burials, and no sand burial （control, CK）, in a typical agro-pastoral transitional zone in Naiman Banner of eastern Inner Mongolia. The aim of this study was to assess the impacts of sand burial on maize （Zea rnays L.） productivity and the soil quality along a gradient of burial depths. Results showed that there was a strong negative effect of sand burial on maize productivity and soil quality, which significantly declined （P〈0.05） under moderate and deep sand burial treatments. In comparison with the CK, the maize yield and above-ground biomass reduced by 47.41% and 39.47%, respectively. The soil silt and clay, soil water, soil organic carbon and total nitrogen contents under deep sand burial decreased by 67.85%, 40.32%, 86.52% and 82.11%, respectively, while microbial biomass carbon, microbial abundance and enzyme activity decreased by 89.78%, 42.28%-79.66% and 69.51%-97.71%, respectively. There was no significant effect on crop productivity and soil quality with shallow sand burial treatment. The correlations analysis showed that there was significant positive correlations of both maize yield and above-ground biomass with soil silt and clay, soil organic carbon and total nitrogen contents, pH, electrical conductivity, soil water content, microbial abundance and biomass and all tested soil enzyme activities. Stepwise regression analysis indicated that soil water and total nitrogen contents, urease, cellobiohydrolase and peroxidase activities were key determining factors for maize productivity. This combination of factors explains reason of the decreased maize productivity with deep sand burial. We found that degradation of cropland as a result of sand burial changed soil physical-chemical properties and soil

关键词： sand burial soil quality enzyme activity maize productivity sandy cropland

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：