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平图的transition多项式的Maple计算
Maple calculation of the transition polynomial of plane graph
李美莲,邓青英<br>LI Mei-lian, DENG Qing-ying
- , 2018, DOI: 10.6040/j.issn.1671-9352.0.2017.218
Abstract: 摘要： 将现有的计算方法改进得到了一种新的计算平图的transition多项式的方法。算法使用了圈置换的方法计算每个transition操作所产生的欧拉圈的数目。利用Maple软件编写出了该算法的程序,通过这个程序,可以实现任意一个平图的transition多项式的计算。
Abstract: A new algorithm to evaluate transition polynomials of plane graph is obtained by improving the existing computational method. The algorithm uses cyclic permutations to count the number of Euler cycles to each transition system. The algorithm can be implemented easily by the computer program written in Maple environment
Recommendation algorithm on feature extraction based on user interests
基于用户兴趣特征提取的推荐算法研究*
LIU Mei-lian,LIU Tong-cun,LI Xiao-long,<br>刘枚莲,刘同存,李小龙
计算机应用研究 , 2011,
Abstract: 传统的推荐算法一定程度上降低了网络消费者的搜索成本，但难以实时提供消费者满意的推荐服务，也忽略了用户偏好动态转移性。为了提高电子商务系统的推荐质量，从用户偏好的行为特征入手，建立了网络用户的兴趣特征提取模型，并设计了相应的推荐算法。通过对用户兴趣特征提取模型的检验和用户兴趣度矩阵的建立，依据与目标用户偏好相似的邻居用户对商品的兴趣程度预测用户对未浏览商品的兴趣度，并选择兴趣度值较高的N个商品推荐给用户。实验结果表明，在用户偏好动态转移的情况下，所设计的推荐算法的推荐精度和推荐效率明显提高，提高了网络用户的
Combination Types of Coexistent Multiple Energy Resources in the Ordos Basin and an Analysis of the Upper Paleozoic Sedimentation Control Mechanism
鄂尔多斯盆地多种能源共存富集的组合形式及上古生界沉积控制机制分析
LI Zeng-xue,YU Ji-feng,LI Jiang-tao,HAN Mei-lian,<br>李增学,余继峰,李江涛,韩美莲
地球学报 , 2007,
Abstract: Coal, oil, uranium and natural gas are genetically related to each other in the Ordos basin, and the combination type of their coexistence is varied, showing regular superposition vertically. Late Palaeozoic is an important minerogenetic period in the Ordos basin. Although the basin is a component part of the North China basin basically characterized by similar sedimentation, the Ordos basin has it unique features. Based on an analysis of the sedimentary characteristics and sequence surfaces of Upper Palaeozoic coal-bearing strata in the basin, the authors divided the strata from Benxi Formation to Shihezi Formation into nine third-order sequences and four second-order sequences. On the whole, there exist altogether seven types of mineral resources, including gas in oil, gas in coal, top gas and bottom oil, uranium in oil, uranium in coal, and oil in coal, with each one being independent. During the evolution and development of the basin, different combinations of energy resources were developed within different structural units, which, however, showed certain degrees of correlation.
Effect of assembled technique on rhizosphere soil ecosystem and resource utilization efficiency of cotton in drylands
技术组合对旱地棉花根际生态系统及资源利用效率的影响
LIANG Zhe-Jun,ZHAO Hai-Zhen,WANG Yu-Xiang,QI Hong-Li,LIU Hui-Min,CAO Mei-Lian,<br>梁哲军,赵海祯,王玉香,齐宏立,刘惠民,曹美莲
中国生态农业学报 , 2008,
Abstract: 将膜下滴灌、平衡施肥、群体控制、水肥耦合、二元覆盖等多种单项技术组合，分析了旱地条件下不同技术组合对棉花根际生态系统和资源利用效率的影响。结果表明：与传统技术相比，技术组合可使棉花苗期根际土壤温度平均提高2．0℃，7月、8月高温胁迫时根际土壤温度降低5．3℃，棉花生长后期根际土壤温度提高3．2℃；减缓棉花根际土壤水分波动幅度，提高土壤保水性能；使0～20cm根际土壤容重降低8．1％，孔隙度提高4．8％，微生物总量提高47．1％；棉花单株根体积增加19．1％，根吸附面积增加4．6％；土壤水分利用效率提高85．6％，氮素生产效率提高48．9％；劳动生产率提高18．5％，投入产出比提高37．9％。因此，技术组合可有效提高旱地农业生产效益和资源使用效率。
4-(2-Nitrobenzenesulfonamido)pyridinium trifluoroacetate
Jiang-Sheng Li,Mei-Lian Fan,Wen-Sheng Li,Wei-Dong Liu
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808020825
Abstract: In the title compound, C11H10N3O4S+·C2F3O2 , the dihedral angle between the benzene ring and the pyridinium ring is 88.7 (4)°. In the crystal structure, a network of N—H...O, C—H...O and C—H...F hydrogen bonds links the constituent ions. One O atom of the nitro group is disordered over two positions, with site-occupancy factors of 0.57 (2) and 0.43 (2).
4-(4-Nitrobenzenesulfonamido)pyridinium trifluoroacetate
Jiang-Sheng Li,Mei-Lian Fan,Wen-Sheng Li,Wei-Dong Liu
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808021405
Abstract: In the title compound, C11H10N3O4S+·C2F3O2 , the benzene ring makes an angle of 87.3 (2)° with the pyridinium ring. The nitro group is essentially coplanar with the benzene ring. The F atoms of the CF3 group are disordered over two positions with almost equal occupancy [0.531 (12)/0.469 (12)]. The crystal structure is stabilized by N—H...O and C—H...O hydrogen bonds.
Design and Implementation on Spatial Information Adaptor
空间信息适配器的设计与实现*
CHEN Jun-hui,LU Mei-lian,<br>陈俊晖,卢美莲
计算机应用研究 , 2005,
Abstract: Discusses the status and function of spatial information adaptor within the spatial information service system's framework,then illustrates the design and detailed implementation on the adaptor,finally puts forward an extended scheme to turn spatial information adaptor to self-adapted spatial information adaptor.
The Application of PBL Teaching Mode in the Theory Teaching of Microbiology
PBL教学模式在病原生物学理论教学中的应用
WANG Si,WANG Mei-Lian,WANG Ji-Chun,ZHENG Lan-Yan,SHI Jun-Yan,LUO En-Jie,<br>王 斯,王美莲,王继春,郑兰艳,史俊岩,罗恩杰
微生物学通报 , 2008,
Abstract: PBL 教学法是一种源自西方,近年来引入我国全新教学模式,它主要培养学生的自学能力,发展学生综合思考能力和解决实际问题能.本文作者总结了中国医科大学病原生物学教研室三年来在理论课教学中采用PBL教学模式的实践经验,通过样本成绩分析证明了 PBL 教学方法对于提高学生综合思考能力很有帮助,同时在意见反馈结果中也显示学生对于 PBL 教学模式有很高的热情,可以很好地发挥学生的主观能动性.
The Application of PBL Teaching Mode in the Theory Teaching of Microbiology
PBL教学模式在病原生物学理论教学中的应用
WANG Si,WANG Mei-Lian,WANG Ji-Chun,ZHENG Lan-Yan,SHI Jun-Yan,LUO En-Jie,<br>王 斯,王美莲,王继春,郑兰艳,史俊岩,罗恩杰
微生物学报 , 2008,
Abstract: PBL教学法是一种源自西方, 近年来引入我国全新教学模式, 它主要培养学生的自学能力, 发展学生综合思考能力和解决实际问题能力。本文作者总结了中国医科大学病原生物学教研室三年来在理论课教学中采用PBL教学模式的实践经验, 通过样本成绩分析证明了PBL教学方法对于提高学生综合思考能力很有帮助, 同时在意见反馈结果中也显示学生对于PBL教学模式有很高的热情, 可以很好地发挥学生的主观能动性。
Adsorption and Desorption Behavior and Mechanism of Vanadium on SQD201 Resin
SQD201树脂对钒的吸附-解吸行为及机理
SHI Mei-lian,DUAN You-gou,YAN Wen-bin,GAO Feng,HUA Jun,<br>石美莲,段友构,颜文斌,高峰,华骏
过程工程学报 , 2011,
Abstract: 通过静态吸附-解吸实验研究了SQD201树脂吸附-解吸钒的交换平衡和动力学特性，考察了pH值、温度和溶液浓度对离子交换过程的影响. 结果表明，在298 K、pH=2.0、溶液浓度为0.040 mol/L条件下，SQD201树脂的静态饱和吸附量为573.80 mg/g；钒在SQD201树脂上的吸附是吸热过程，符合Langmuir等温吸附方程. 吸附和解吸过程主要受颗粒扩散控制，吸附过程的表观活化能为20.41 kJ/mol，解吸表观活化能为22.21 J/mol. 吸附机理分析表明，SQD201树脂主要吸附的钒阴离子为H2V10O284-，H2V10O284-与树脂的理论摩尔比为1:4.
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