The necessity of the use of the block and parallel modeling of the nonlinear continuous mappings with NN is firstly expounded quantitatively. Then, a practical approach for the block and parallel modeling of the nonli...The necessity of the use of the block and parallel modeling of the nonlinear continuous mappings with NN is firstly expounded quantitatively. Then, a practical approach for the block and parallel modeling of the nonlinear continuous mappings with NN is proposed. Finally, an example indicating that the method raised in this paper can be realized by suitable existed software is given. The results of the experiment of the model discussed on the 3-D Mexican straw hat indicate that the block and parallel modeling based on NN is more precise and faster in computation than the direct ones and it is obviously a concrete example and the development of the large-scale general model established by Tu Xuyan.展开更多
This paper studies a queueing model with the finite buffer of capacity K in wireless cellular networks, which has two types of arriving calls--handoff and originating calls, both of which follow the Markov arriving pr...This paper studies a queueing model with the finite buffer of capacity K in wireless cellular networks, which has two types of arriving calls--handoff and originating calls, both of which follow the Markov arriving process with different rates. The channel holding times of the two types of calls follow different phase-type distributions. Firstly, the joint distribution of two queue lengths is derived, and then the dropping and blocking probabilities, the mean queue length and the mean waiting time from the joint distribution are gotten. Finally, numerical examples show the impact of different call arrival rates on the performance measures.展开更多
In this paper,based on coupled network generated by chaotic logarithmic map,a novel algorithm for constructing hash functions is proposed,which can transform messages and can establish a mapping from the transformed m...In this paper,based on coupled network generated by chaotic logarithmic map,a novel algorithm for constructing hash functions is proposed,which can transform messages and can establish a mapping from the transformed messages to the coupled matrix of the network.The network model is carefully designed to ensure the network dynamics to be chaotic.Through the chaotic iterations of the network,quantization and exclusive-or (XOR) operations,the algorithm can construct hash value with arbitrary length.It is shown by simulations that the algorithm is extremely sensitive to the initial values and the coupled matrix of the network,and has excellent performance in one-way,confusion and diffusion,and collision resistance.展开更多
南水入冀新水情下,百泉泉域地下水环境发生改变,岩溶地下水地球化学过程有待查明。综合利用数值模拟、机器学习(自组织聚类)和同位素(δD和δ^(18)O)等方法系统揭示了矿业活动与南水入冀下百泉泉域岩溶地下水地球化学过程,并基于熵变权...南水入冀新水情下,百泉泉域地下水环境发生改变,岩溶地下水地球化学过程有待查明。综合利用数值模拟、机器学习(自组织聚类)和同位素(δD和δ^(18)O)等方法系统揭示了矿业活动与南水入冀下百泉泉域岩溶地下水地球化学过程,并基于熵变权水质指数(Entropy-weighted water quality index,EWQI)进行了水质分级评价。南水入冀后,百泉泉域岩溶地下水位整体抬升。时间上,呈现出既有年际动态变化又有年内季节变化特征。空间上,补给区表现为剧变型,而径流、排泄区呈缓变型。地下水降落漏斗主要分布在泉域东南部的煤、铁矿密集区。泉域岩溶地下水呈弱碱性,水化学类型以Ca-HCO_(3)型和Ca-SO_(4)型为主导。主要阴阳离子质量浓度遵循ρ(HCO_(3)^(-))>ρ(SO_(4)^(2-))>ρ(Cl^(-))和ρ(Ca^(2+))>ρ(Mg^(2+))>ρ(Na^(+))>ρ(K^(+))的顺序。各离子沿着径流路径呈现出逐渐增大的空间分布特征。岩溶地下水化学成分主要受岩石(方解石、白云石和石膏)风化溶解和反向阳离子交换作用主导。人为活动对泉域岩溶地下水系统中的SO_(4)^(2-)和NO_(3)^(-)质量浓度有一定程度影响。岩溶地下水来源于大气降水,并且在入渗前发生了二次蒸发作用,氘盈余值在径流过程中有所降低。水质评价结果表明,岩溶地下水质量整体优于第四系地下水,分别有50%的岩溶水和37.5%的第四系水样满足饮用目的。TDS、ρ(SO_(4)^(2-))和ρ(NO_(3)^(-))是影响泉域地下水水质的关键指标。引起泉域岩溶地下水系统水质恶化的潜在人类活动主要包括矿山排水、农业灌溉和城市污水排放。通过水质分级评价,提出了泉域地下水环境保护措施。研究结果将有助于为百泉泉域岩溶地下水资源的供水安全和地下水环境保护治理提供参考。展开更多
茶多酚是一类从茶叶中提取的多酚类物质的总称,在医药、食品和农业等领域具有广阔的应用前景。基于CNKI和WOS数据库,采用文献计量学方法,应用CiteSpace和VOSviewer软件对1953-2023年茶多酚研究论文进行数据挖掘和定量分析。结果表明:①7...茶多酚是一类从茶叶中提取的多酚类物质的总称,在医药、食品和农业等领域具有广阔的应用前景。基于CNKI和WOS数据库,采用文献计量学方法,应用CiteSpace和VOSviewer软件对1953-2023年茶多酚研究论文进行数据挖掘和定量分析。结果表明:①70年来,CNKI和WOS数据库中茶多酚研究论文数量均呈逐渐增长趋势。CNKI数据库中,论文主要发表在《福建茶叶》《食品工业科技》《食品科学》等期刊上,轻工业手工业学科的发文最多,基金资助以国家自然科学基金、国家科技支撑计划、国家重点研发计划等为主;WOS数据库中,论文主要发表在Journal of Agricultural and Food Chemistry、Food Chemistry、International Journal of Biological Macromolecules等期刊上,属于Food Science Technology学科的发文最多,基金资助以National Natural Science Foundation of China、United States Department of Health and Human Services、National Institutes of Health等为主;②从国家间的合作来看,中国发文量最大,同United States以及Philippines、Sri Lanka、Singapore等亚洲国家合作研究紧密,与India合作较少;③CNKI数据库中,浙江大学、江南大学、西南大学等是主要的研究机构,杨贤强、王岳飞、沈生荣等团队是国内主要的研究团队,国内研究涉及茶多酚的提取、抗氧化特性及其药理活性等方面;WOS数据库中,Rutgers University Systerm、Chinese Academy of Sciences、Zhejiang University等是主要的研究机构,Hara Y和Mukhtar H是主要的研究团队,国际研究更加关注茶多酚在医疗健康领域中的应用;④CNKI数据库中,“抗氧化”“壳聚糖”“保鲜”等是出现频率较高的关键词,茶多酚在食品领域中的应用是国内研究的前沿领域;WOS数据库中,关键词“catechins”“epigallocatechin gallate”“inhibition”等出现频率较高,国际研究前沿聚焦茶多酚与人体健康间的互作关系。通过文献综合分析可以帮助科研人员掌握该领域的研究现状和热点动态,明确未来研究方向。展开更多
低碳城市研究已经成为全球城市领域研究热点。伴随着研究文献的快速增长,很多低碳城市知识处于“诞生—进化—扬弃”的快速“迭代”中,给低碳城市研究者和实践者有效知识图景的建立带来巨大的挑战。文章立足科学知识图谱理论,采用CiteSp...低碳城市研究已经成为全球城市领域研究热点。伴随着研究文献的快速增长,很多低碳城市知识处于“诞生—进化—扬弃”的快速“迭代”中,给低碳城市研究者和实践者有效知识图景的建立带来巨大的挑战。文章立足科学知识图谱理论,采用CiteSpace共引文分析方法,以Web of Science为数据来源,开展全球低碳城市知识网络研究,以求展现更为全面且具有针对性的知识图景。研究发现在知识网络形态方面,低碳城市知识网络存在:(1)“四大”知识集聚区;(2)“中心—外围”组织形式;(3)三阶段演化的时序阶段。在知识网络重点内容方面,低碳城市认知类知识基础包含了认知理论、碳排放定量化方法、低碳城市关联现象3个方面,低碳实践类知识基础包含了可持续转型、循环经济、智慧城市三大方向。而前沿知识包含了可再生能源、环境政策、数字经济、绿色金融、碳交易5个方面。基于知识网络归纳,文章认为低碳城市研究存在如下发展趋势:(1)呈现跨学科属性与可持续发展多目标融合的特点;(2)呈现明显的“认知”与“实践”的辩证式演进趋势;(3)存在“殊途也不同归”的实践导向。展开更多
基金The project was supported by the National Natural Science Foundation of China (60375014) and the Postdoctoral Sci-ence Foundation of China
文摘The necessity of the use of the block and parallel modeling of the nonlinear continuous mappings with NN is firstly expounded quantitatively. Then, a practical approach for the block and parallel modeling of the nonlinear continuous mappings with NN is proposed. Finally, an example indicating that the method raised in this paper can be realized by suitable existed software is given. The results of the experiment of the model discussed on the 3-D Mexican straw hat indicate that the block and parallel modeling based on NN is more precise and faster in computation than the direct ones and it is obviously a concrete example and the development of the large-scale general model established by Tu Xuyan.
基金supported by the Postgraduate Innovation Project of Jiangsu University (CX10B 003X)
文摘This paper studies a queueing model with the finite buffer of capacity K in wireless cellular networks, which has two types of arriving calls--handoff and originating calls, both of which follow the Markov arriving process with different rates. The channel holding times of the two types of calls follow different phase-type distributions. Firstly, the joint distribution of two queue lengths is derived, and then the dropping and blocking probabilities, the mean queue length and the mean waiting time from the joint distribution are gotten. Finally, numerical examples show the impact of different call arrival rates on the performance measures.
基金supported by the Program for New Century Excellent Talents in University of China(No.NCET-06-0510)National Natural Science Founda-tion of China(No. 60874091)Six Projects Sponsoring Talent Summits of Jiangsu Province(No. SJ209006)
文摘In this paper,based on coupled network generated by chaotic logarithmic map,a novel algorithm for constructing hash functions is proposed,which can transform messages and can establish a mapping from the transformed messages to the coupled matrix of the network.The network model is carefully designed to ensure the network dynamics to be chaotic.Through the chaotic iterations of the network,quantization and exclusive-or (XOR) operations,the algorithm can construct hash value with arbitrary length.It is shown by simulations that the algorithm is extremely sensitive to the initial values and the coupled matrix of the network,and has excellent performance in one-way,confusion and diffusion,and collision resistance.
文摘南水入冀新水情下,百泉泉域地下水环境发生改变,岩溶地下水地球化学过程有待查明。综合利用数值模拟、机器学习(自组织聚类)和同位素(δD和δ^(18)O)等方法系统揭示了矿业活动与南水入冀下百泉泉域岩溶地下水地球化学过程,并基于熵变权水质指数(Entropy-weighted water quality index,EWQI)进行了水质分级评价。南水入冀后,百泉泉域岩溶地下水位整体抬升。时间上,呈现出既有年际动态变化又有年内季节变化特征。空间上,补给区表现为剧变型,而径流、排泄区呈缓变型。地下水降落漏斗主要分布在泉域东南部的煤、铁矿密集区。泉域岩溶地下水呈弱碱性,水化学类型以Ca-HCO_(3)型和Ca-SO_(4)型为主导。主要阴阳离子质量浓度遵循ρ(HCO_(3)^(-))>ρ(SO_(4)^(2-))>ρ(Cl^(-))和ρ(Ca^(2+))>ρ(Mg^(2+))>ρ(Na^(+))>ρ(K^(+))的顺序。各离子沿着径流路径呈现出逐渐增大的空间分布特征。岩溶地下水化学成分主要受岩石(方解石、白云石和石膏)风化溶解和反向阳离子交换作用主导。人为活动对泉域岩溶地下水系统中的SO_(4)^(2-)和NO_(3)^(-)质量浓度有一定程度影响。岩溶地下水来源于大气降水,并且在入渗前发生了二次蒸发作用,氘盈余值在径流过程中有所降低。水质评价结果表明,岩溶地下水质量整体优于第四系地下水,分别有50%的岩溶水和37.5%的第四系水样满足饮用目的。TDS、ρ(SO_(4)^(2-))和ρ(NO_(3)^(-))是影响泉域地下水水质的关键指标。引起泉域岩溶地下水系统水质恶化的潜在人类活动主要包括矿山排水、农业灌溉和城市污水排放。通过水质分级评价,提出了泉域地下水环境保护措施。研究结果将有助于为百泉泉域岩溶地下水资源的供水安全和地下水环境保护治理提供参考。
文摘茶多酚是一类从茶叶中提取的多酚类物质的总称,在医药、食品和农业等领域具有广阔的应用前景。基于CNKI和WOS数据库,采用文献计量学方法,应用CiteSpace和VOSviewer软件对1953-2023年茶多酚研究论文进行数据挖掘和定量分析。结果表明:①70年来,CNKI和WOS数据库中茶多酚研究论文数量均呈逐渐增长趋势。CNKI数据库中,论文主要发表在《福建茶叶》《食品工业科技》《食品科学》等期刊上,轻工业手工业学科的发文最多,基金资助以国家自然科学基金、国家科技支撑计划、国家重点研发计划等为主;WOS数据库中,论文主要发表在Journal of Agricultural and Food Chemistry、Food Chemistry、International Journal of Biological Macromolecules等期刊上,属于Food Science Technology学科的发文最多,基金资助以National Natural Science Foundation of China、United States Department of Health and Human Services、National Institutes of Health等为主;②从国家间的合作来看,中国发文量最大,同United States以及Philippines、Sri Lanka、Singapore等亚洲国家合作研究紧密,与India合作较少;③CNKI数据库中,浙江大学、江南大学、西南大学等是主要的研究机构,杨贤强、王岳飞、沈生荣等团队是国内主要的研究团队,国内研究涉及茶多酚的提取、抗氧化特性及其药理活性等方面;WOS数据库中,Rutgers University Systerm、Chinese Academy of Sciences、Zhejiang University等是主要的研究机构,Hara Y和Mukhtar H是主要的研究团队,国际研究更加关注茶多酚在医疗健康领域中的应用;④CNKI数据库中,“抗氧化”“壳聚糖”“保鲜”等是出现频率较高的关键词,茶多酚在食品领域中的应用是国内研究的前沿领域;WOS数据库中,关键词“catechins”“epigallocatechin gallate”“inhibition”等出现频率较高,国际研究前沿聚焦茶多酚与人体健康间的互作关系。通过文献综合分析可以帮助科研人员掌握该领域的研究现状和热点动态,明确未来研究方向。
文摘低碳城市研究已经成为全球城市领域研究热点。伴随着研究文献的快速增长,很多低碳城市知识处于“诞生—进化—扬弃”的快速“迭代”中,给低碳城市研究者和实践者有效知识图景的建立带来巨大的挑战。文章立足科学知识图谱理论,采用CiteSpace共引文分析方法,以Web of Science为数据来源,开展全球低碳城市知识网络研究,以求展现更为全面且具有针对性的知识图景。研究发现在知识网络形态方面,低碳城市知识网络存在:(1)“四大”知识集聚区;(2)“中心—外围”组织形式;(3)三阶段演化的时序阶段。在知识网络重点内容方面,低碳城市认知类知识基础包含了认知理论、碳排放定量化方法、低碳城市关联现象3个方面,低碳实践类知识基础包含了可持续转型、循环经济、智慧城市三大方向。而前沿知识包含了可再生能源、环境政策、数字经济、绿色金融、碳交易5个方面。基于知识网络归纳,文章认为低碳城市研究存在如下发展趋势:(1)呈现跨学科属性与可持续发展多目标融合的特点;(2)呈现明显的“认知”与“实践”的辩证式演进趋势;(3)存在“殊途也不同归”的实践导向。
