检索结果-南通市图书馆

Building Resilience Through Disaster Waste Management——UN Environment's Experiences and Approaches

工程科学与技术 2018年第3期50卷 15-23页

作者： PRADHAN Mahesh xu qing International Environmental Technology Centre United Nations Environment Programme Sichuan Academy of Environmental Sciences

Integrating disaster waste issue is a critical component of making humanitarian action fit for the future,anticipating global risks and challenges such as increased vulnerability due to climate change and environmental *** requires a fundamental shift towards a model that not only strengthens the response to crises but also learns and adapts in order to anticipate and act before such waste *** article conducted analyses on the characteristics of disasters in the past two *** confound disaster waste management,including the timing and magnitude of each disaster,and the amounts and types of waste that will be *** these reasons alone,disaster waste management must be an integral part of development planning and *** 10 years since the 2008 Wenchuan earthquake,this article highlights that disaster waste management is not only debris clearance or waste management following a disaster,but also includes prevention and pre-disaster preparedness aspects in terms of enhancing resilience of local ***"mainstreaming,"ensures that disaster waste management(DWM)will be treated as a priority issue,on an ongoing *** on UN Environment's experiences and approaches,this paper emphasises that preparedness is the key,and that priority should be accorded to integrating disaster contingency planning in national and city level waste management strategies as well as mainstreaming waste management issues within broader disaster preparedness and response plans and *** is envisaged that the issues presented and the gaps identified in this paper will provide a basis for future comprehensive and cohesive research on disaster waste *** turn,this research can lead to better preparedness and response on disaster waste management.

关键词： disaster waste disaster risk reduction waste management Sendai Framework

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

Transformation behavior and shape memory effect of Ti_(50-x)Ni_(48)Fe_2Nb_x alloys by aging treatment

引用

Rare Metals 2012年第4期31卷 311-317页

作者： xu, qing Liu, Fushun School of Materials Science and Engineering Beijing University of Aeronautics and AstronauticsBeijing 100191China

The influence of aging treatment on transformation behavior and shape memory of the Ti 50_x Ni_(48) Fe_2 Nb_x(x=0,0.6,0.8,1.0,and 1.2) alloys was investigated using differential scanning calorimeter(DSC),mechanical drawing machine,and microhardness tester in this *** is indicated that the aging treatment has a significant effect on the phase transformation temperatures(M_s,M_f,M_p,A_s,A_f,and A_p) and microhardness of the *** phase transformation temperatures are found to decrease initially with the increasing aging temperature from 300 to 500 ℃ and increase with further increase of the aging *** aging treatment at intermediate temperature between 400 and 500 ℃ results in an improved shape memory *** addition,the highest microhardness value is also obtained.

关键词： Ti-Ni-Fe-Nb shape memory alloys martensitic transformation aging treatment phase transformation temperature

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

Lithium cobaltate:a novel host material enables high-rate and stable lithium-sulfur batteries

引用

Rare Metals 2018年第11期37卷 929-935页

作者： Wen Ma qing xu GRINM Bohan (Beijing) Publisher Co. Ltd.GRINM Group Co.Ltd. Subinstitute of Standardization Theory and Strategy China National Institute of Standardization

Element sulfur is highly attractive due to their potentially low cost and environmental ***, polysulfides dissolution hinders the lithiumsulfur(Li-S) batteries toward commercialization. To overcome these issues, in this work, lithium cobaltate as a commercial material, for the first time, was devoted to engineering the electrode structure and composition to improve the performance. When incorporated with 80% sulfur powder, the synergetic effects of cobalt atoms and interlayer spaces effectively enable the production of Li-S batteries with a relatively high discharge capacity of 1420 mAh·g-1at the low surface current density of 1 mA·cm-2and stable capacity retention of 650 mAh·g-1at high surface current density of 6 mA·cm-2. The introduction of lithium cobaltate is a viable approach for successfully developing practical Li-S batteries.

关键词： Lithium cobaltate Polysulfides dissolution Electrochemical properties Lithium-sulfur batteries

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

Existence of Three HMOLS of Type 2~nu^1

引用

Acta Mathematica Sinica,English Series 2009年第8期25卷 1325-1336页

作者： Yun qing xu Mathematics Department Ningbo University Ningbo 315211 P. R. Uhina

A Latin squares of order v with ni missing sub-Latin squares （holes） of order hi （1 〈= i 〈 k）, which are disjoint and spanning （i.e. ∑k i=l1 nihi = v）, is called a partitioned incomplete Latin squares and denoted by PILS. The type of PILS is defined by （h1n1 h2n2…hknk ）. If any two PILS inaset of t PILS of type T are orthogonal, then we denote the set by t-HMOLS（T）. It has been proved that 3-HMOLS（2n31） exist for n ≥6 with 11 possible exceptions. In this paper, we investigate the existence of 3-HMOLS（2nu1） with u ≥ 4, and prove that 3-HMOLS（2~u1） exist if n ≥ 54 and n ≥7/4u ＋ 7.

关键词： holey Latin square mutually orthogonal Latin square group divisible design

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

On the Spectrum of Mutually r-orthogonal Idempotent Latin Squares

引用

Acta Mathematicae Applicatae Sinica 2015年第3期31卷 813-822页

作者： Yun-qing xu Mathematics Department Ningbo University

Two Latin squares of order v are r-orthogonal if their superposition produces exactly r distinct ordered pairs. The two squares are said to be r-orthogonal idempotent Latin squares and denoted by r-MOILS（v）if they are all idempotent. In this paper, we show that for any integer v≥28, there exists an r-MOILS（v） if and only if r∈[v, v^2]／ {v ＋ 1, v^2-1}.

关键词： Latin square r-orthogonal idempotent

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

On GF(p)-linear complexities of binary sequences

引用

The Journal of China Universities of Posts and Telecommunications 2009年第4期16卷 112-115,124页

作者： xu Li-qing Software Engineering Institute East China Normal University Shanghai 200062 China

Several geometric sequences have very low linear complexities when considered as sequences over GF（p）, such as the binary sequences of period q^n - 1 constructed by Chan and Games [1-2] （q is a prime power p^m, p is an odd prime） with the maximal possible linear complexity q^n-1 when considered as sequences over GF（2）. This indicates that binary sequences with high GF（2） linear complexities LC2 and low GF（p）-linear complexities LCp are not secure for use in stream ciphers. In this article, several lower bounds on the GF（p）-linear complexities of binary sequences is proved and the results are applied to the GF（p）-linear complexities of Blum-Blum-Shub, self-shrinking, and de Bruijn sequences. A lower bound on the number of the binary sequences with LC2 〉 LCD is also presented.

关键词： cryptography stream cipher binary sequences GF(2) linear complexity GF(p)-linear complexity

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

Analysis of torque transmitting behavior and wheel slip prevention control during regenerative braking for high speed EMU trains

引用

Acta Mechanica Sinica 2016年第2期32卷 244-251页

作者： Kun xu Guo-qing xu Chun-Hua Zheng Shenzhen Institutes of Advanced Technology Chinese Academy of Sciencesand The Chinese University of Hong Kong Shenzhen College of Advanced Technology University of Chinese Academy of Sciences School of Electronics and Information Tongji University

The wheel-rail adhesion control for regenerative braking systems of high speed electric multiple unit trains is crucial to maintaining the stability,improving the adhesion utilization,and achieving deep energy *** remain technical challenges mainly because of the nonlinear,uncertain,and varying features of wheel-rail contact *** research analyzes the torque transmitting behavior during regenerative braking,and proposes a novel methodology to detect the wheel-rail adhesion ***,applications to the wheel slip prevention during braking are investigated,and the optimal slip ratio control scheme is proposed,which is based on a novel optimal reference generation of the slip ratio and a robust sliding mode *** proposed methodology achieves the optimal braking *** simulation results for uncertain slippery rails verify the effectiveness of the proposed methodology.

关键词： High speed electric multiple unit(EMU) train Regenerative braking Wheel-rail adhesion Optimal slip ratio

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

A new formula on the Fresnel reflectance and its application in microwave remote sensing

引用

Science China Earth Sciences 2004年第11期47卷 1045-1052页

作者： xu qing LIU Yuguang Key Laboratory of Physical Oceanography of the Ministry of Education Ocean University of China Qingdao 266003 China Key Laboratory of Physical Oceanography of the Ministry of Education Ocean University of China Qingdao 266003 China

A new formula on the Fresnel reflectance is derived based on our understanding of the complex index of refraction and continuity condition of the E-M waves across the interface between two media. The imaginary component of the complex index of refraction is related to the attenuation of the E-M waves propagating in a medium. It does not denote the phase of the E-M waves. The traditional derivation confuses the physical meaning of the imaginary component of the complex index of refraction. The derived formula on the Fresnel reflectance can be used to obtain the emissivity of sea surface, which is useful to retrieve sea surface temperature and sea surface salinity in the microwave remote sensing.

关键词： reflectance, refraction, microwaves, optics, remote sensing.

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

Consolidation Mechanism of Chloride Ion in Soda Residue from Ammonia Soda Process Method

引用

Journal of Wuhan University of Technology(Materials Science) 2023年第3期38卷 616-622页

作者：余海燕 HU Lintong xu qing School of Materials Science and Engineering Tianjin Chengjian UniversityTianjin 300384China Tianjin Key Laboratory of Building Green Functional Materials Tianjin Chengjian UniversityTianjin 300384China

Soda residue-magnesium oxychloride cement is prepared with soda residue from ammonia soda process method,magnesium oxide and magnesium sulfate heptahydrate as main raw materials,and its consolidation mechanism of chloride ion is *** results show that the hydration products of soda residue-magnesium oxychloride cement are mainly 5-phase,gypsum and brucite,which exist in the matrix in needle rod shape,long plate shape and hexagonal plate shape,*** the molar ratio of MgO/MgCl_(2) is 8:1,the concentration of MgSO_(4) is 29%,and the mass ratio of soda residue:magnesium oxide:magnesium sulfate heptahydrate is 45.8:36.4:*** chloride ion consolidation effect of the sample is the best,and the chloride ion consolidation content of the 7 d sample is about 93%.The chloride ion consolidation content of the 28 d sample is about 96%.

关键词： soda residue magnesium oxychloride cement chloride ion hydrate composition

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

Lighting up rotaxanes with AIEgens

引用

Chinese Chemical Letters 2023年第3期34卷 122-133页

作者： Xiao-Qin xu xu-qing Wang Wei Wang School of Chemistry and Molecular Engineering East China Normal UniversityShanghai 200062China Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices South China University of TechnologyGuangzhou 510640China

Aiming at the construction of novel rotaxanes with desired luminescent properties for practical applications, recently the rapid development of rotaxanes decorated with aggregation-induced emission(AIE) luminogens(i.e., AIEgens) has been witnessed. The combination of AIEgens and rotaxanes leads to the successful construction of a novel type of luminescent rotaxanes with many attractive features. In particular, the unique controllable dynamic feature of rotaxanes endows the resultant AIEgen-based rotaxanes precisely tunable emissions under external stimuli, leading to the construction of a novel type of smart luminescent materials. In this minireview, the recent progress of AIEgen-based rotaxanes has been summarized, with an emphasis on the design strategy and potential applications.

关键词： Mechanically interlocked molecules Aggregation-induced emission Molecular shuttles F?rster resonance energy transfer Light harvesting Aggregate

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：