检索结果-南通市图书馆

New designing for nanostructured 2D materials and 2D superlattices

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Materials 2018年第5期61卷 761-762页

作者： yao xiao Lei Fu The Institute for Advanced Studies (IAS) Wuhan University Wuhan 430072 China College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China

As the most remarkable candidate for the next-generationelectronics, two-dimensional （2D） materials have at-tracted much interest. Recently in a letter in NatureMaterials, Professor David A. Muller and Lain-Jong Liand their cooperators reported the direct synthesis ofone-dimensional （1D） MoS2 channels embedded in 2DWSe2 monolayers through a dislocation-catalyzed strategy[1].

关键词：中国科学材料科学

Isolation, characterization and phylogenetic analysis of a bacterial strain capable of degrading acetamiprid

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2006年第1期18卷 141-146页

作者： yao xiao-hua MIN Hang College of Life Science Zhejiang University Hangzhou 310029 China College of Agriculture Guangxi University Guangxi 530005 China

An aerobic bacterium, capable of degrading the new chloronicotine pesticide acetamiprid, was isolated from the sludge of pesticide factory after successive enrichment cultures and named strain FH2 which is a Gram-negative, rod-shaped, obligate aerobic organism with （（0.5-0.7）×（l.5-3.0））μm of cell size and with monotrichous flagellum. It was identified as a member of Pseudomonas sp. based on morphology, physio-biochemical properties, Biolog GN2, 16S rDNA sequence and phylogenetic characteristic analysis. The isolate could grow optimally at pH 7.0 and 30℃ in acetamiprid-mineral medium with 800 mg/L concentration. About 53.3% acetamiprid was degraded by strain FH2 after incubation for 14 d in acetamiprid-mineral medium and nearly 96.7% degraded when incubated in acetamiprid-yeast mineral medium at 30℃ for 14 d. This paper describes phylogenetic and degradation characterization of a pure bacterium being able to mineralize acetamiprid for the first time.

关键词： acetamiprid biodegradation characterization isolation Pseudomonas sp. 16S rDNA

Polynomial Entropy of Amenable Group Actions for Noncompact Sets

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2023年第7期39卷 1351-1368页

作者： Lei LIU xiao yao ZHOU School of Mathematics and Statistics Shangqiu Normal UniversityShangqiu 476000China School of Mathematical Sciences and Institute of Mathematics Nanjing Normal UniversityNanjing 210023China

In this paper, we define and study polynomial entropy on an arbitrary subset and local measure theoretic polynomial entropy for any Borel probability measure on a compact metric space,and investigate the relation between local measure-theoretic polynomial entropy of Borel probability measures and polynomial entropy on an arbitrary subset. Also, we establish a variational principle for polynomial entropy on compact subsets in the context of amenable group actions.

关键词： Bowen polynomial entropy local measure-theoretic polynomial entropy variational principle amenable group

在线全文

学校读者我要写书评

暂无评论

青稞分蘖角度的QTL定位

作物学报 2025年第1期51卷 260-272页

作者：杨景发余鑫莲姚有华姚晓华王蕾吴昆仑李新青海大学农林科学院/青海省作物分子育种重点实验室/青海省青稞遗传育种重点实验室/青藏高原种质资源研究与利用实验室/青海大学省部共建三江源生态与高原农牧业国家重点实验室青海西宁810016

分蘖角度是青稞株型的主要构成因素,在提高青稞产量与抗倒伏性中发挥着极为重要的作用。为解析青稞分蘖角度的遗传机制,本研究以青稞品种‘达章紫’(株型松散)和‘昆仑10号’(株型紧凑)为亲本构建的RIL群体为材料,基于高密度遗传图谱,... 详细信息

分蘖角度是青稞株型的主要构成因素,在提高青稞产量与抗倒伏性中发挥着极为重要的作用。为解析青稞分蘖角度的遗传机制,本研究以青稞品种‘达章紫’(株型松散)和‘昆仑10号’(株型紧凑)为亲本构建的RIL群体为材料,基于高密度遗传图谱,在多环境中进行青稞分蘖角度的QTL定位,并利用RIL群体衍生的剩余杂合系,对鉴定到的主效QTLqTA7H-1进行精细定位。在青稞7条染色体上共检测到9个控制分蘖角度的QTL,解释表型变异为6.41%~33.57%,其中,qTA3H-1和qTA7H-1为多环境共检测的主效QTL,平均加性效应分别为5.42°(增效)和-3.87°(减效);在减效QTL qTA7H-1初定位区间筛选到4个剩余杂合体,自交衍生F8:9近等基因系,在置信区间内加密设计14对分子标记对RHL群体极端单株进行检测,利用获得的5种交换类型单株,将qTA7H-1进一步界定在PC08(32,252,397)与PA10(41,790,765)约9.54Mb的物理区间内。本研究初步揭示调控青稞分蘖角度的遗传因子,为开展分蘖角度性状的遗传改良与分子设计育种奠定了基础。

关键词：青稞分蘖角度 QTL定位主效位点

同方期刊数据库博看期刊

Promotion of Cooperation in a Spatial Public Goods Game with Long Range Learning and Mobility

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第11期29卷 231-235页

作者： xiao yao HUA Da-Yin Department of Physics Ningbo UniversityNingbo 315211

We studied the effect of population density in a spatial public goods *** found that the effect on the evolution of cooperation is very complex when the strategy learning and mobility of players in a long range are considered in a two-dimensional *** the learning range is larger than the mobility range,the system is driven to enter into a cooperation state for a low population density,because a small local group is beneficial to sustain a high level of *** population density increases to a moderate range,the mobility of players from a domain invaded by defectors supports the evolution stability of *** the mobility range is larger than the learning range,a formation of compact domains of cooperators promotes cooperation as the population density becomes high.

关键词： cooperation operators learning

Infinitely Many Solutions for a Class of Quasi-linear Elliptic Problem

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2024年第3期40卷 728-743页

作者： xiao-yao JIA Zhen-luo LOU School of Economics and Management Zhongyuan University of TechnologyZhengzhou 450007China Mathematics and Statistics School Henan University of Science and TechnologyLuoyang 471023China

In this paper,we study the following quasi-linear elliptic equation:■where Ω?R^(N) is a bounded domain,λ>0 is a *** function ψ(|t|)t is the subcritical term,and φ(|t|)t is the critical Orlicz-Sobolev growth term with respect to φ.Under appropriate conditions on φ,ψ and φ,we prove the existence of infinitely many weak solutions for quasi-linear elliptic equation,for λ∈(0,λ_(0)),where λ_(0)> 0 is a fixed constant.

关键词： quasi-linear elliptic equations variational methods Orlicz-Sobolev spaces

Properties and Application of Oil-well Cement Enhanced with a Novel Composite Toughening Agent

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2007年第2期4卷 52-59页

作者： Hua Sudong yao xiao College of Materials Science and Engineering Nanjing University of Technology Nanjing Jiangsu 210009 China

Brittle fracture of cement sheath, induced by perforation and stimulation treatments, can cause cross flow of formation fluid and increase casing damage. A novel agent XL was developed for solving the problem. Experimental results showed that the toughness of the set cement containing XL was improved remarkably. The engineering properties of the slurry containing XL, drag reducer USZ （0.2% BWOC）, filtrate loss additive F 17B （1.2% BWOC） and crystalloid expanding agent F17A （3% BWOC） could meet technical requirements of cementing operation. After perforation, good quality cement sheath enhanced with XL was observed by CBL/VDL logs in a deep well.

关键词： Oil-well cement cementing cement sheath set cement fiber

Uniqueness on Difference Operators of Meromorphic Functions of Infinite Order

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2024年第2期40卷 511-527页

作者： Hui LI Ming Liang FANG xiao yao School of Science China University of Mining and TechnologyBeijing 100083P.R.China Institute of Mathematics Academy of Mathematics and System SciencesChinese Academy of SciencesBeijing 100190P.R.China School of Sciences Hangzhou Dianzi UniversityHangzhou 310012P.R.China School of Mathematical sciences and LPMC Nankai UniversityTianjin 300071P.R.China

We investigate the uniqueness problems of meromorphic functions and their difference operators by using a new *** is proved that if a non-constant meromorphic function f shares a non-zero constant and ∞ counting multiplicities with its difference operators Δcf(z) and Δ_(c)^(2)f(z), thenΔcf(z)≡Δ_(c)^(2)f(z).In particular,we give a difference analogue of a result of *** method has two distinct features:(ⅰ) It converts the relations between functions into the corresponding *** makes it possible to deal with the uniqueness problem by linear algebra and combinatorics.(ⅱ) It circumvents the obstacle of the difference logarithmic derivative lemma for meromorphic functions of infinite order,since this method does not depend on the growth of the ***,the idea in this paper can also be applied to the case for several variables.

关键词： Uniqueness meromorphic functions difference operators infinite order

A Hint Frequency Based Approach to Enhancing the I/O Performance of Multilevel Cache Storage Systems

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2017年第2期32卷 312-328页

作者： xiao-Dong Meng Chen-Tao Wu Min-Yi Guo Jie Li xiao-yao Liang Bin yao Long Zheng Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China

With the enormous and increasing user demand, I/O performance is one of the primary considerations to build a data center. Several new technologies in data centers, such as tiered storage, prompt the widespread usage of multilevel cache techniques. In these storage systems, the upper level storage typically serves as a cache for the lower level, which forms a distributed multilevel cache system. However, although many excellent multilevel cache algorithms have been proposed to improve the I/O performance, they still have potential to be enhanced by investigating the history information of hints. To address this challenge, in this paper, we propose a novel hint frequency based approach （HFA）, to improve the overall multilevel cache performance of storage systems. The main idea of HFA is using hint frequencies （the total number of demotions/promotions by employing demote/promote hints） to efficiently explore the valuable history information of data blocks among multiple levels. HFA can be applied with several popular multilevel cache algorithms, such as Demote, Promote and Hint-K. Simulation results show that, compared with original multilevel cache algorithms such as Demote, Promote and Hint-K, HFA can improve the I/O performance by up to 20% under different I/O workloads.

关键词： storage system multilevel cache hint I/O performance