检索结果-南通市图书馆

Climate Governance and Sustainable Development

在线全文

学校读者我要写书评

暂无评论

Contemporary World 2022年第4期 37-41页

作者： zhang haibin the School of International Relations Peking University Climate Change and Low Carbon Development Committee Chinese Meteorological Society

Climate change is one of the most severe challenges faced by all countries in the world *** international community is following closely the development of global climate *** is generally believed that the United Nations Conference on the Human Environment held in 1972 marked the beginning of global environment governance,and that the initiation of global climate negotiations under the framework of the UN was the start of global climate governance.

关键词： climate Climate Sustainable

Simulation extractable SNARKs based on target linearly collision-resistant oracle

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2024年第9期67卷 2853-2866页

作者： WANG LiGuan LI Yuan zhang ShuangJun CAI DongLiang KAN haibin Shanghai Key Laboratory of Intelligent Information Processing School of Computer ScienceFudan UniversityShanghai 200433China Shanghai Engineering Research Center of Blockchain Shanghai 200433China Yiwu Research Institute of Fudan University Yiwu 322000China

The famous zero-knowledge succinct non-interactive arguments of knowledge(zk-SNARK) was proposed by Groth in ***, the construction is based on quadratic arithmetic programs which are highly efficient concerning the proof length and the verification complexity. Since then, there has been much progress in designing zk-SNARKs, achieving stronger security,and simulated extractability, which is analogous to non-malleability and has broad applications. In this study, following Groth's pairing-based zk-SNARK, a simulation extractability zk-SNARK under the random oracle model is constructed. Our construction relies on a newly proposed property named target linearly collision-resistant, which is satisfied by random oracles under discrete logarithm assumptions. Compared to the original Groth16 zk-SNARK, in our construction, both parties are allowed to use such a random oracle, aiming to get the same random number. The resulting proof consists of 3 group elements and only 1 pairing equation needs to be verified. Compared to other related works, our construction is shorter in proof length and simpler in verification while preserving simulation extractability. The results also extend to achieve subversion zero-knowledge SNARKs.

关键词： quadratic arithmetic program simulation extractability subversion zero-knowledge succinct non-interactive arguments of knowledge target linearly collision-resistant

Design of Embryo-electronic Systems Capable of Self-diagnosing and Self-healing and Configuration Control

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2009年第6期22卷 637-643页

作者： Xu Guili Xia Zhenghao Wang haibin zhang Zhai Wang Youren College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

As aerospace vehicles travel in a hellish environment, the reliability of the measuring and controlling systems has played a critical role in the credibility of a whole airborne system. Embryo-electronic system is a bionic hardware capable of self-diagnosing and self-healing. This article presents a new approach to design embryo-electronic systems and introduces their bionic principles, system structures and fanlt-tolerant mechanism. As the current methods cannot meet the requirements for large-scale embryo-electronic systems, this article advances a new shift-register-based configuration memory of embryonic system to solve the problem by using the inter-cell communication to reduce the gene storage capacity of a single cell. The article designs an overall structure of the shift-register-based configuration memories of the embryonic system and connects them into a chain structure. The article also designs an inner circuit of the cell, the control of shift-register-based configuration memory and the way of runtime dynamic configuration. The simulation of field programmable gate array （FPGA） evidences the realizability of the proposed design. Compared to the SRAM-based one, this memory can save 90% of the area when constructing embryonic systems larger than 128× 128 under the same condition.

关键词： aerospace vehicle embryonic systems configuration control dynamic reconfiguration fault-tolerant

Effects of the US withdrawal from Paris Agreement on the carbon emission space and cost of China and India

在线全文

学校读者我要写书评

暂无评论

Frontiers in Energy 2018年第3期12卷 362-375页

作者： Hancheng DAI Yang XIE haibin zhang Zhongjue YU Wentao WANG College of Environmental Sciences and Engineering Peking UniversityBeijing 100875 China School of Economics and Management Beihang University Beijing100191 China School of International Studies Peking University Beijing 100875China School of Environmental Science and Engineering Shanghai Jiao TongUniversity Shanghai 200240 China The Administrative Center for China's Agenda 21 Ministry of Scienceand Technology Beijing 100038 China

Climate mitigation has become a global issue and most countries have promised their greenhouse gas reduction target. However, after Trump took office as president of the United States （US）, the US withdrew from the Paris Agreement. As the biggest economy, this would have impacts on the emission space of other countries. This paper, by using the integrated model of energy, environ- ment and economy/computable general equilibrium （IMED/CGE） model, assesses the impacts of the US withdrawal from Paris Agreement on China, India in terms of carbon emission space and mitigation cost under Nationally Determined Contributions （NDCs） and 2~C scenarios due to changed emission pathway of the US. The results show that, under the condition of constant global cumulative carbon emissions and fixed burden sharing scheme among the countries, the failure of the US to honor its NDC commitment will increase its carbon emission space and decrease its mitigation cost. However, the carbon emission space of other regions, including China and India, will be reduced and their mitigation costs will be raised. In 2030, under the 2℃ target, the carbon price will increase by US$14.3 to US$45.3/t in China and by US S10.7 to US$33.9/t in India. In addition, China and India will incur additional GDP loss. Under the 2℃ target, the GDP loss of China would increase by US$23.3 to US$72.6 billion （equivalent to US$17.4 to US$54.2/capita）, and that of India would rise by US$14.2 to US$43.1 billion （equivalent to US$9.3 to US$28.2/capita）.

关键词： Paris Agreement China and India the US withdrawal carbon emission space mitigation cost

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

盾构下穿既有建筑物桩基托换工程施工技术

建设监理 2024年第5期 114-117页

作者：戴长康张海彬陈乔松黄生辉方程广州轨道交通建设监理有限公司广东广州510000

广州海珠湾隧道工程建造阶段中,由于盾构段设计线路途经既有建筑且建筑无法拆除,选用桩基托换设计方案来保护既有建筑的安全稳定。该技术的特点就是不需对原建筑物进行拆除、重建,而采用新增托换桩基础、受力结构,达到建筑荷载转换的效... 详细信息

广州海珠湾隧道工程建造阶段中,由于盾构段设计线路途经既有建筑且建筑无法拆除,选用桩基托换设计方案来保护既有建筑的安全稳定。该技术的特点就是不需对原建筑物进行拆除、重建,而采用新增托换桩基础、受力结构,达到建筑荷载转换的效果。托换结果表明,被托换桩的上覆荷载能够有效地转移到新建托换桩上,盾构机在下穿既有建筑期间,托换结构及建筑沉降量均在预警范围内,由此表明本项托换技术方案可行。

关键词：既有建筑物桩基托换预应力张拉切桩

在线全文

学校读者我要写书评

暂无评论

彩色小麦品系农艺性状与营养品质分析

麦类作物学报 2024年第10期44卷 1270-1278页

作者：叶君吴晓华王小兵崔国惠李元清刘文景张海斌赵轩微刘娟李梁代亚博张德健路战远史学芬赵贤内蒙古自治区农牧业科学院作物科学研究所内蒙古呼和浩特010031 内蒙古大学生命科学学院内蒙古呼和浩特010021 鄂尔多斯市农牧业科学研究院内蒙古鄂尔多斯017000 巴彦淖尔市现代农牧事业发展中心内蒙古巴彦淖尔015000

为鉴选彩色小麦优异种质,以29份彩色小麦品系为试验材料,测定其生育期、株高、穗粒重、穗粒数、千粒重、蛋白质含量、淀粉含量、铁含量、锌含量和钙含量等农艺性状与营养品质指标,并对测定指标进行相关性分析、主成分分析及聚类分析。... 详细信息

为鉴选彩色小麦优异种质,以29份彩色小麦品系为试验材料,测定其生育期、株高、穗粒重、穗粒数、千粒重、蛋白质含量、淀粉含量、铁含量、锌含量和钙含量等农艺性状与营养品质指标,并对测定指标进行相关性分析、主成分分析及聚类分析。结果显示,供试材料的生育期平均为99.45 d,株高为99.45 cm,穗粒数为49.15,穗粒重为2.12 g,千粒重为42.10 g,蛋白质含量为15%,淀粉含量为65%,Fe含量为33.59 mg·kg^(-1),Zn含量为35.05 mg·kg^(-1),Ca含量为309.88 mg·kg^(-1)。蛋白质、淀粉和锌含量的遗传多样性最高,均为2.05。相关性分析表明,蛋白质含量与锌含量呈极显著正相关(R=0.58),与淀粉含量呈极显著负相关(R=-0.30)。通过主成分分析将10个参数降维至3个主成分,第一主成分的主效因子为蛋白质含量,第二主成分的主效因子为株高,第三主成分的主效因子为千粒重、铁和钙含量。通过主成分因子的综合评分,评分较高的品系有20TS020-6、20TS116-1和20TSJ012。聚类分析表明,供试彩色小麦品系可划分为3大类群,第Ⅰ类群有9份品系,蛋白质含量、株高、千粒重、铁和钙含量较高;第Ⅱ类群有12份品系,蛋白质含量、株高、千粒重、铁和钙含量居中;第Ⅲ类群有8份品系,蛋白质含量、株高、千粒重、铁和钙含量较低。粒色对产量相关的农艺性状没有显著效应,但紫粒小麦和蓝粒小麦的淀粉和钙含量较高。

关键词：彩色小麦品系农艺性状营养品质综合评价

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

阿什旦牦牛在甘南地区的适应性观察

畜牧兽医杂志 2024年第5期43卷 37-39页

作者：赵光平毛红霞杨树猛牟永娟张海滨甘南藏族自治州畜牧工作站甘肃合作747000

为了提高甘南牦牛生产性能,甘南州畜牧工作站与中国农业科学院兰州畜牧与兽药研究所依托项目从青海省牦牛繁育推广服务中心引进阿什旦牦牛种公牛20头,分别投放在甘肃省甘南州合作市、夏河县、临潭县、卓尼县的部分牦牛养殖专业合作社试... 详细信息

为了提高甘南牦牛生产性能,甘南州畜牧工作站与中国农业科学院兰州畜牧与兽药研究所依托项目从青海省牦牛繁育推广服务中心引进阿什旦牦牛种公牛20头,分别投放在甘肃省甘南州合作市、夏河县、临潭县、卓尼县的部分牦牛养殖专业合作社试养,进行了适应性观察。经过对阿什旦牦牛在甘南地区的生长发育、生理指标、采食、抗病性能等方面观察发现阿什旦牦牛在甘南地区具有良好的适应性,表明阿什旦牦牛可以被引进甘南地区。

关键词：阿什旦牦牛甘南地区适应性观察

维普期刊数据库博看期刊

Manipulating photogenerated electron flow in nickel single‐atom catalysts for photocatalytic CO_(2)reduction into tunable syngas

在线全文

学校读者我要写书评

暂无评论

Carbon Energy 2024年第8期6卷 205-213页

作者： Yida zhang Qingyu Wang Lihui Wu haibin Pan Chengyuan Liu Yue Lin Gongming Wang Xusheng Zheng National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefeiAnhuiChina College of Chemistry and Materials Science University of Science and Technology of ChinaHefeiAnhuiChina Department of Chemistry Hefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefeiAnhuiChina

The key to designing photocatalysts is to orient the migration of photogenerated electrons to the target active sites rather than dissipate at inert ***,we demonstrate that the doping of phosphorus(P)significantly enriches photogenerated electrons at Ni active sites and enhances the performance for CO_(2)reduction into *** photocatalytic CO_(2)reduction,Ni single‐atom‐anchored P‐modulated carbon nitride showed an impressive syngas yield rate of 85μmol gcat^(−1)h^(−1)and continuously adjustable CO/H_(2)ratios ranging from 5:1 to 1:2,which exceeded those of most of the reported carbon nitride‐based single‐atom *** studies reveal that P doping improves the conductivity of catalysts,which promotes photogenerated electron transfer to the Ni active sites rather than dissipate randomly at low‐activity nonmetallic sites,facilitating the CO_(2)‐to‐syngas photoreduction process.

关键词： carbon nitride CO_(2)photoreduction electron flow Ni single atoms syngas

Generalized Irreducible α-Matrices and Its Applications

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

Advances in Linear Algebra & Matrix Theory 2018年第3期8卷 111-121页

作者： Yi Sun haibin zhang Chaoqian Li School of Mathematics and Statistics Yunnan University Kunming China Jilin Vocational College of Industry and Technology Jilin China

The class of generalized α-matrices is presented by Cvetkovi?, L. (2006), and proved to be a subclass of H-matrices. In this paper, we present a new class of matrices-generalized irreducible α-matrices, and prove that a generalized irreducible α-matrix is an H-matrix. Furthermore, using the generalized arithmetic-geometric mean inequality, we obtain two new classes of H-matrices. As applications of the obtained results, three regions including all the eigenvalues of a matrix are given.

关键词： Generalized Irreducible α-Matrices H-Matrices Irreducible Nonsingular Eigenvalues