检索结果-南通市图书馆

Boosting proso millet yield by altering canopy light distribution in proso millet/mung bean intercropping systems

The Crop Journal 2020年第2期8卷 365-377页

作者： Xiangwei Gong Uzizerimana Ferdinand ke Dang Jing Li Guanghua Chen Yan Luo pu Yang Baili Feng State key Laboratory of Crop Stress Biology in Arid Areas Shaanxi Research Station of Crop Gene Resources&Germplasm EnhancementMinistry of AgricultureCollege of AgronomyNorthwest A&F UniversityYangling 712100ShaanxiChina

To elucidate the mechanism by which intercropping proso millet(Panicum miliaceum L.)with mung bean(Vigna radiata L.)increases proso millet yield and to determine how this higher yield results from maximization of resources use efficiency,we designed and conducted four strip intercropping row arrangements,including two rows of proso millet alternating with two rows of mung bean(2P2M),four rows of proso millet alternating with two rows of mung bean(4P2M),four rows of proso millet alternating with four rows of mung bean(4P4M),two rows of proso millet alternating with four rows of mung bean(2P4M),sole proso millet(SP,control)and sole mung bean(SM,control)in Yulin,Shaanxi,*** active radiation(PAR)in the canopy,radiation use efficiency(RUE),leaf photosynthetic characteristics,dry matter accumulation and allocation,and yield of proso millet were *** results showed that the intercropping systems had higher PAR than the *** PAR intensities were increased by respectively 2.2%–23.4%,19.8%–59.7%,and 61.2%–133.3%in the proso millet upper,middle and lower canopies compared with *** increase in PAR directly increased RUE,a result attributed mainly to the increase in photosynthetic capacity,including net photosynthetic rate and chlorophyll *** responses resulted in increased dry matter allocation to plant *** of intercropped proso millet was 6.8%–37.3%higher than that under monoculture and the land equivalent ratios for the different intercropping patterns were all greater than unity(>1).In general,yield followed a positive linear function of PAR in the intercropping *** results indicated that intercropping can boost proso millet yield,evidently by altering light distribution within its canopy and consequently increasing RUE,thereby increasing leaf photosynthetic capacity,dry matter accumulation,and allocation to the *** optimum combination for improving the growth and yield of proso millet on the Loe

关键词： intercropping distribution thereby

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

Regioselective enzymatic acylation of troxerutin in nonaqueous medium

引用

Chinese Chemical Letters 2010年第1期21卷 59-62页

作者： Xiao, Yong Mei Mao, pu Zhao, Zhen Yang, Liang Ru Lin, Xian fu Henan Univ Technol Coll Chem & Chem Engn Zhengzhou 450001 Peoples R China Zhejiang Univ Dept Chem Hangzhou 310027 Peoples R China

A series of monosubstituted troxerutin esters have been synthesized by enzyme-catalyzed regioselective acylation of troxerutin in nonaqueous *** divinyl dicarboxylates(CH_2=CH-OOC-(CH_2)_n-COO-CH=CH_2,n = 2,3,4,7,8,11) featuring different chain length as acyl donors and alkaline protease from Bacillus subtilis as catalyst,troxerutin was regioselective acylated at B ethoxyl *** results indicated that the regioselectivity of the enzyme-catalyzed acylation was not affected by the chain length o...

关键词： Troxerutin Acylation Enzymatic synthesis Regioselectivity

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

Childhood Adversity Phenotypes and Risky Health Behaviors among Chinese Adolescents: Extending the Concept of Adversity

引用

Biomedical and Environmental Sciences 2022年第8期35卷 699-710页

作者： WANG Geng fu YUAN Meng Yuan CHANG Jun Jie LI Yong Han SU pu Yu Department of Maternal Child and Adolescent HealthSchool of Public HealthAnhui Medical UniversityHefei 230032AnhuiChina key Laboratory of Population Health Across Life Cycle(Anhui Medical University) Ministry of Education of the People's Republic of ChinaHefei 230032AnhuiChina NHC key Laboratory of study onabnormal gametes and reproductive tract Hefei 230032AnhuiChina

ObjectiveTo present an approach to phenotyping ACEs and explore the association between ACEs and adolescent health risky behaviors based on the social context of *** Totally,5,726 adolescents aged 12-18 years were investigated about their ACEs in the family,peer,school,and personal domains and the occurrence of six types of risky health behaviors(i.e.,smoking,drinking,sexual intercourse,self-harm,and suicidal ideation and attempts).Latent class analysis(LCA)was used to explore the ACE *** Six latent classes of ACEs were identified,including low adversity,school adversity,school adversity and peer victimization,peer victimization,maltreatment and peer victimization,and high adversity,and associated with risky health behaviors in *** physically punished by a teacher,experiencing sexual abuse,and experiencing family trauma most strongly differentiated from the six AcE classes and were correlated with an increased risk for risky adolescent health *** study supports a positive association between ACEs and risky adolescent health *** victimization,school adversity and associated contexts need to be considered in future ACEstudies.

关键词： Adverse childhood experiences Adolescents Healthy risky behaviors Sexual abuse Peer victimization China

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

Numerical study on ULF waves in a dipole field excited by sudden impulse

引用

Science China(Technological Sciences) 2008年第10期51卷 1665-1676页

作者： YANG Biao fu SuiYan ZONG QiuGang WANG Yongfu ZHOU XuZhi pu ZuYin XIE Lun Institute of Space Physics and Applied Technology Peking UniversityBeijing 100871China Center for Atmospheric Research University of Massachusetts LowellLowellMA 01854-3629USA

A three-dimensional numerical model is employed to investigate ULF waves ex-cited by the sudden impulse (SI) of the solar wind dynamic pressure interacting with a dipole magnetosphere. We focus on the solar wind-magnetosphere energy coupling through ULF waves, and the influences of the SI spectrum on the cavity mode structure and the energy deposition due to field line resonances (FLRs) in the magnetosphere. The numerical results show that for a given SI lasting for 1 min with amplitude of 50 mV/m impinging on the subsolar magnetopause, the total ULF energy transported from the solar wind to the magnetosphere is about the magni-tude of 1014 J. The efficiency of the solar wind energy input is around 1%, which depends little on the location of the magnetopause in the model. It is also found that the energy of the cavity mode is confined in the region near the magnetopause, whereas, the energy of the toroidal mode may be distributed among a few specific L-shells. With a given size of the model magnetosphere and plasma density distri-bution, it is shown that the fundamental eigenfrequency of the cavity mode and the central locations of the FLRs do not vary noticeably with the power spectrum of the SI. It is worth noting that the spectrum of the SI affects the excitation of higher harmonics of the global cavity mode. The broader the bandwidth of the SI is, the higher harmonics of cavity mode could be excited. Meanwhile, the corresponding FLRs regions are broadened at the same time, which implies that the global cavity modes and toroidal modes can resonate on more magnetic L-shells when more harmonics of the global cavity modes appear.

关键词： sudden impulse ULF waves global cavity mode toroidal mode field line resonances

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

Diatom-inspired multiscale mineralization of patterned protein–polysaccharide complex structures

引用

National Science Review 2021年第8期8卷 186-197页

作者： ke Li Yingfeng Li Xinyu Wang Mengkui Cui Bolin An Jiahua pu Jintao Liu Boyang Zhang Guijun Ma Chao Zhong School of Physical Science and Technology Shanghai Tech University Center for Materials Synthetic Biology Shenzhen Institute of Synthetic BiologyShenzhen Institutes of Advanced TechnologyChinese Academy of Sciences CAS key Laboratory of Quantitative Engineering Biology Shenzhen Institute of Synthetic BiologyShenzhen Institutes of Advanced TechnologyChinese Academy of Sciences

Marine diatoms construct their hierarchically ordered, three-dimensional(3D) external structures called frustules through precise biomineralization processes. Recapitulating the remarkable architectures and functions of diatom frustules in artificial materials is a major challenge that has important technological implications for hierarchically ordered composites. Here, we report the construction of highly ordered,mineralized composites based on fabrication of complex self-supporting porous structures—made of genetically engineered amyloid fusion proteins and the natural polysaccharide chitin—and performing in situ multiscale protein-mediated mineralization with diverse inorganic materials, including SiO2, TiO2and Ga2O3. Subsequently, using sugar cubes as templates, we demonstrate that 3D fabricated porous structures can become colonized by engineered bacteria and can be functionalized with highly photoreactive minerals,thereby enabling co-localization of the photocatalytic units with a bacteria-based hydrogenase reaction for a successful semi-solid artificial photosynthesis system for hydrogen evolution. Our study thus highlights the power of coupling genetically engineered proteins and polysaccharides with biofabrication techniques to generate hierarchically organized mineralized porous structures inspired by nature.

关键词： biomimetic mineralization patterned porous structure genetic engineering amyloid protein artificial photosynthesis

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Optimal squeezed cooling of a mechanical oscillator using measurement-based vector feedback

引用

Science China(Physics,Mechanics & Astronomy) 2023年第7期66卷 55-61页

作者： Zhi-Cheng Gong Cheng-Yu Shen Tian-Hua Mao Chang-pu Sun Yong Li Hao fu School of Science Hainan UniversityHaikou 570228China Innovation Academy for Precision Measurement Science and Technology Chinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100190China Graduate School of China Academy of Engineering Physics Beijing 100193China Beijing Computational Science Research Center Beijing 100193China Center for Theoretical Physics Hainan UniversityHaikou 570228China

Measurement-based feedback has been adopted as an efficient cooling scheme capable of suppressing the thermal fluctuation of a mechanical resonator to a level limited by measurement *** present a scheme of squeezed cooling in which the limit of feedback cooling imposed by the measurement imprecision is surpassed by parametrically squeezing the mechanical resonator in a periodically oscillating optical *** stabilize the parametrically amplified quadrature and simultaneously optimize the cooling for the squeezed quadrature,a measurement-based vector feedback capable of independently controlling the orthogonal motional quadrature is *** experiment demonstrates that the optimal condition for the squeezed cooling closely depends on the strength of *** the ability to keep the orthogonal quadrature well decoupled,optimal squeezed cooling of the mechanical resonator under strong squeezing is achieved with the squeezed variance becoming 8.1 dB below the limit of feedback cooling and the creation of a 31.7 dB thermomechanical squeezed *** this research is conducted in the classical regime,the scheme of squeezed cooling can be naturally extended to quantum systems with the prospects of creating quantum squeezing of a room-temperature mechanical resonator and enabling displacement measurement beyond the standard quantum limit.

关键词： squeezed cooling measurement-based feedback parametric squeezing optimal control optomechanics

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

Two-dimensional MgSiP_(2) with anisotropic electronic properties and good performances for Na-ion batteries

引用

Chinese Chemical Letters 2021年第3期32卷 1081-1085页

作者： Chunying pu Jiahui Yu Ling fu Jia Wang Houyong Yanga Dawei Zhou Chaozheng He Institute of Environment and Energy Catalysis School of Materials Science and Chemical EngineeringXi’an Technological UniversityXi’an 710021China College of Physics and Electronic Engineering Nanyang Normal UniversityNanyang 473061China Shaanxi key Laboratory of Optoelectronic functional Materials and Devices School of Materials Science and Chemical EngineeringXi'an Technological UniversityXi'an 710021China

Using the global particle-swarm optimization method and density functional theory,we predict a new stable two-dimensional layered material:MgSiP_(2)with a low-buckled honeycomb *** HSE06 calculation shows that MgSiP_(2)is an indirect-gap semiconductor with a band-gap of 1.20 eV,closed to that of bulk *** remarkably,MgSiP_(2)exhibits worthwhile anisotropy along with electron and hole carrier mobility.A ultrahigh electron mobility is even up to 1.29×10^(4)cm^(2)V^(-1)s^(-1).while the hole mobility is nearly zero along the a *** large difference of the mobility between electron and hole together with the suitable band-gap suggest that MgSiP_(2)may be a good candidate for solar cell or photochemical catalysis ***,we explore MgSiP_(2)as an anode for sodium-ion batte *** Na adsorption,the semiconducting MgSiP_(2)transforms to a metallic state,ensuring good electrical conductivity.A maximum theoretical capacity of 1406 mAh/g,a small volume change(within 9.5%),a small diffusion barrier(~0.16 eV)and low average open-circuit voltages(~0.15 V)were found fo r MgSiP_(2)as an anode for sodium-ion *** results are helpful to deepen the understanding of MgSiP_(2)as a nanoelectronic device and a potential anode for Na-ion batteries.

关键词： First-principles calculations Two-dimensional MgSiP_(2) Anode materials Sodium-ion batteries Carrier mobility

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

NDUFA8 potentially rescues Wolbachia-induced cytoplasmic incompatibility in Laodelphax striatellus

引用

Insect Science 2023年第6期30卷 1689-1700页

作者： Jie Chen Meng-ke Wang Qi-Xian Xie Xiao-Li Bing Tong-pu Li Xiao-Yue Hong Department of Entomology Nanjing Agricultural UniversityNanjingChina

The endosymbiont Wolbachia manipulates host reproduction by several strategies, one of the most important of which is cytoplasmic incompatibility (CI). CI can be rescued when Wolbachia-infected males mate with females infected with the same Wolbachia strain. However, the potential rescue mechanism of CI in the small brown planthopper Laodelphax striatellus is unclear. In this study, comparative transcriptome analysis was applied to explore the effect of Wolbachia on L. striatellus eggs. A total of 1387 differentially expressed genes were identified. RNA interference of 7 Wolbachia-upregulated key planthopper genes reduced egg reproduction, suggesting that Wolbachia might improve fecundity in L. striatellus by affecting these 7 genes. Suppressing the expression of another upregulated gene, NDUFA8 (encoding NADH dehydrogenase [ubiquinone] 1 α subcomplex subunit 8-like) by RNA interference significantly increased the mortality of early embryos without affecting the number of deposited eggs. Wolbachia infection upregulated the mRNA level of NDUFA8, and dsNDUFA8 treatment of Wolbachia-infected females recreated CI-like symptoms, suggesting that NDUFA8 is associated with the rescue phenotype. Because all L. striatellus populations worldwide are infected with Wolbachia, NDUFA8 is a potential pest control target.

关键词： cytoplasmic incompatibility Laodelphax striatellus NDUFA8 reproduc-tion rescue Wolbachia

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

Promoted porous Co_3O_4-Al_2O_3 catalysts for ammonia decomposition

引用

Science China Chemistry 2018年第11期61卷 1389-1398页

作者： Zhe-Shan Zhang Xin-pu fu Wei-Wei Wang Zhao Jin Qi-Sheng Song Chun-Jiang Jia key Laboratory for Colloid and Interface Chemistry Key Laboratory of Special Aggregated Materials School of Chemistry and Chemical Engineering Shandong University

Transition metal catalysts have been considerably used for NH3 decomposition because of the potential application in COx-free H2 generation for fuel cells. However, most transition metal catalysts prepared via traditional synthetic approaches performed the inferior stability due to the agglomeration of active components. Here, we adopted an efficient method, aerosol-assisted self- assembly approach （AASA）, to prepare the optimized cobalt-alumina （C0304-A1203） catalysts. The C0304-A1203 catalysts exhibited excellent catalytic performance in the NH3 decomposition reaction, which can reach 100% conversion at 600 ℃and maintain stable for 72 h at a gaseous hourly space velocity （GHSV） of 18000 cm3 gcat-1 h-1. The catalysts were characterized by various techniques including transmission electron microscope （TEM）, scanning electron microscope （SEM）, nitrogen sorption, temperature-programmed reduction by hydrogen （H2-TPR）, ex-situ/in-situ Raman and ex-situ/in-situ X-ray diffraction （XRD） to obtain the information about the structure and property of the catalysts. H2-TPR and in-situ XRD results show that there is strong interaction between the cobalt and alumina species, which influences the redox properties of the catalysts. It is found that even a low content of alumina （10 at%） is able to stabilize the catalysts due to the adequate dispersion and rational interaction between different components, which ensures the high activity and superior stability of the cobalt-alumina catalysts.

关键词： cobalt-alumina catalyst aerosol-assisted self-assembly approach ammonia decomposition anti-sintering redox prop-erties

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

Concentration　level　of　heavy　metals　in　the　Great　Wall　Bay，　Antarctica　in　austral　summer

引用

Journal of Environmental Sciences 1996年第2期8卷 173-177页

作者： pu Jiabin fu Yunna Li Zhongping (Institute of Marine Environmental Protection, SOA, Dalian 116023, China) Inst. of Mar. Environ. Protection SOA Dalian 116023 China

Heavy metals in different marine environmental mediums from the Great Wall Bay, Antarctica were determined. Sea water samples from 14 stations, surface sediments from 2 stations and marine organisms from 1 station were analyzed for Cu, Pb, Zn, Cd, Cr, Hg concentrations, The results showed that the terrestrial input characteristics of Cu, Pb and Cr in sea water was evident. Zn concentration in the outlet water was high. The difference of each heavy metal concentration in two sediments was low. The enriching ability of seaweed to Zn was relatively high. Generally speaking, the concentration level of heavy metals in the Great Wall Bay was low.

关键词： Antarctica Great Wall Bay heavy metals.

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：