Spatial Simulation of Population in China's Coastal Zone based on Multi-source Data

Coastal zone is not only the hotspot of population aggregation and rapid economic growth, but also eco- environmentally sensitive, vulnerable to natural disasters.Detailed spatial distribution information of population is of great significance for solving resource allocation and disaster risk management in the coastal zone.This paper took the coastal cities in China as the study area.We combined the NPP- VIIRS data and NDVI data to construct Human Settlements Index(HSI), and selected the proportion of residential area per unit grid as a parameter to enhance the inter-demographic difference.Then, we used the dynamic partitioning samples and model to obtain the 1000 m grid population distribution data in the coastal zone of China(POP).To show the advantages of our proposed modeling approach, the published Chinese 1000 m grid population data(TPOP)and world population data with 100 m resolution(WorldPOP)were used to compare with our simulated POP data.For the comparison, three indicators were chosen: the macroscopic distribution characteristics, difference between urban and rural area, and population distribution within city.Results show that all the three data can reflect the macroscopic distribution characteristics of population in China&#39;s coastal zone, while POP has the best performance of depicting urban and rural differences in population distribution and the most detailed features of population distribution within city.According to the census and POP data, due to the influence of the coastal terrain and regional to national economic development strategies, the population distribution in China&#39;s coastal zone has obvious regional characteristics:(1)Topographically, the population density of montane and tidal flats areas is generally low(below 5 person/hm~2), while that of plain and estuary delta areas is generally high(over 10 person/hm~2).(2)At macroscopic scale, areas with high population density(over 25 person/hm~2)are mainly concentrated in coastal plain areas such as the Circum Bohai Sea region, the Yangtze River delta and the Pearl River delta;the population distribution in the north of the Yangtze River has the pattern of large dispersion and small concentration, especially in the provinces of Shandong and Jiangsu, the population distribution in the south of the Yangtze River is relatively concentrated, mainly in the coastal lowlands and plains in Zhejiang, Fujian, and Guangdong.(3)Regarding the urban and rural differences, the higher the urban level is, the more significant the gradient characteristics of population distribution will be;meanwhile, there is a huge difference in population density among urban, suburbs and exurban areas.</p

社会主义市场经济条件下公平与效率关系的再思考

公平、效率及其关系问题一直是经济学界所争论的难题之一，甚至有的人称之为经济学的“斯克芬斯”之谜。对此，仁者见仁，智者见智。“效率优先，兼顾公平”无论是作为一种理论探讨还是作为一项战略实施都应具有其特定的历史性，都应该随着社会实践的发展而有所创新。目前，在中国经济处于转型时期，尤其在居民收入差距不断拉大，社会分配不公现象日益严重的状况下，重新审视公平与效率的关系，对公平与效率战略进行重新抉择就显得更为重要了。 本文主要分为四章： 第一章主要就公平与效率的一般性理论问题进行了总结和评论，涉及公平与效率的基本概念；马克思主义者关于公平与效率理论的论述；中外理论界关于公平与效率抉择理论的评述等。 ...学位：法学硕士院系专业：马列主义理论教学部_科学社会主义与国际共产主义运动学号：19990700

土地经营权编入民法典路径研究——以新修订《农村土地承包法》为契机

《农村土地承包法》修订通过,立法上明确土地承包经营权"三项两类"利用方式,就决定了土地经营权并非一元属性。应区分不同情形,债权型的土地经营权由民法典合同编调整,物权型的土地经营权由民法典物权编调整。根据物权法定原则,赋予流转五年以上的土地经营权以物权效力,设立农地耕作权。将原《物权法》中"土地承包经营权"章名,在民法典物权编中修改为"土地承包经营权与土地经营权"。明确土地承包经营权以"户"为单位享有,集体经济组织成员依法享有土地承包各项权益,以此为基础建构土地承包经营权有偿退出机制。立法宗旨上,民法典应持完善土地承包法立场,详细规定土地经营权制度,保障乡村振兴战略稳步实施

论有效供给与有效需求——萨伊、凯恩斯供求理论之比较及其现实意义

供给不等于有效供给 ,需求不等于有效需求。萨伊、凯恩斯之供求理论既有区别亦有联系 ,两者是一分为二 ,合二为一的关系。两者的结合点才是解决生产过剩 (市场疲软 )的真正手段

论民法典合同编(草案)不当得利第三人返还条款立法取舍——以刑事追赃视角切入

我国《民法典合同编(草案)》第771条规定不当得利第三人返还条款,当第三人有偿时,不区分主观善意或恶意第三人就可取得利益,如此立法值得商榷。一方面,当刑事追赃涉及第三人利益需要民事..

Simulation Design of a Terminal Short-Circuit Type Inter-Digital Band Pass Filter

基于悬置线交指滤波器通带内插入损耗比较小,具有很高的选择性和很大的带外衰减,常应用于无线电收、发接收机以及雷达通信系统中。将综合设计法和微波电路仿真软件AdS(AdVAnCEd dESIgn SySTEM)相结合,设计悬置线终端短路式交指带通滤波器。根据交指滤波器的理论得到每个杆的归一化单位长自电容和两相邻杆的归一化单位长互电容,得到滤波器的最初尺寸。并利用AdS软件建模、仿真、优化调整,最后得到该滤波器的几何参数尺寸终值。该设计方法简单,适合工程应用。Inter-digital band-pass filters based on overhanging lines are often used in wireless transceivers and radar communication systems due to their low pass-band inserting attenuation,precise selectivity and high outer-band attenuation.The combination of traditional calculation method and microwave ADS(Advanced Design System) software is used to design a filter of this type.The normalized self-capacitor,mutual capacitor of unit length and the initial value of the geometry parameters of the filter are obtained in accordance with the theory of inter-digital band-pass filter.ADS software is utilized to build model,make simulation and optimizing adjustments.This method is simple and suitable for designing filter in practice.福建省自然科学基金资助项目(2006J0410);福建省科技计划项目(2008H0032

一种快速搜索散乱点云数据k邻近的算法

针对逆向工程中散乱点云数据的k近邻搜索,提出一种快速搜索散乱点云k邻近点的算法。该算法根据点云数据的范围、点的总数及最近点数目k,确定合适的立方体边长,采用空间划分策略,把数据划分成多个子立方体;然后用哈希表记录每个子立方体所包含的数据点及每个点所在的立方体索引号,并排除不包含数据的子立方体,以此确定邻近点的最佳搜索范围。实验结果表明:该算法有效的提高k近邻搜索的速度,同时保证了搜索结果的正确性。福建省自然科学基金(2009J01266

Effect of steric hindrance on the biodegradation of dissolved methyl-phenanthrene

以菲(Phe)和甲基菲(MP:1-MP、3-MP、4-MP、9-MP)为研究对象,运用同步荧光法研究微生物Novosphingobium; pentaromativorans; US6-1对5种溶解态多环芳烃(PAHs)的降解特性.结果显示:MP在8*10~(-7),1.2*10~(-6)mol/L2种浓度下,其生物降解; 过程符合零级动力学,降解速率均为:4-MP<9-MP<1-MP<3-MP;5种PAHs的最大生物降解速率同理论最大跨膜通量存在良好的线性关系;N; aN_3对Phe降解速率影响较小,但抑制MP降解且抑制程度与取代基位置有关.The biodegradation of dissolved phenanthrene (Phe) and; methyl-phenanthrene (MP), including 1-MP, 3-MP, 4-MP and 9-MP by the; bacterium Novosphingobium pentaromativorans US6-1was individually; studied using synchronous fluorescence spectrometry. The biodegradation; of MP was adequately described by zero-order kinetics at two; concentrations, i.e., 8*10~(-7)mol/L and 1.2*10~(-6)mol/L. The rates of; biodegradation were generally in the following order:; 4-MP<9-MP<1-MP<3-MP. There was a good linear relationship between the; measured maximum biodegradation rates and the theoretical maximum; transmembrane fluxes. The addition of NaN_3exerted little effects on the; biodegradation of Phe but inhibited that of MP, with the degree of; inhibition dependent on the position of the methyl substituent.国家自然科学基金资助项目; 国家海洋局海洋溢油鉴别与损害评估技术重点实验室开放基金资助项目; 高等学校博士学科点专项科研基金资助项

Simulation design of terminal open-circuit type interdigital band-pass filter

基于悬置线交指带通滤波器通带内插入损耗比较小,具有很高的选择性和很大的带外衰减,常应用于无线电收、发接收机以及雷达通信系统中.将综合设计法和微波电路仿真软件AdS相结合,设计悬置线终端开路式交指带通滤波器.根据交指滤波器的理论得到每个杆的归一化单位长自电容和两相邻杆的归一化单位长互电容,得到滤波器的最初尺寸.利用AdS软件建模、仿真、优化调整,最后得到该滤波器的几何参数尺寸终值.该设计方法简单,适合工程应用.The interdigital band-pass filter based on suspended line with low pass-band insertion,precise selective and high out-band attenuation,which is often used in wireless transceiver and radar communication system.In order to design band-pass filter which hangs to place the open-circuit type of the line terminal,the traditional calculate method is combined with the microwave ADS software,the self-capacitor,mutual capacitor and the initial value of the geometry parameter of the interdigital band-pass filter are obtained according to the exact design theory of the interdigital band-pass filter.by building model,simulation,and optimization adjustment,the final value of the geometry parameter for the filter is gotten.The method is simple in designing filter and easily available for engineering applications.福建省自然科学基金资助项目(2006J0410);福建省科技计划项目(2008H0032

若尔盖高寒草地微地形的土壤微生物群落多样性特征

结合坡面微地形变化,从土壤微生物群落多样性角度研究典型缓丘区不同坡位上土壤微生物群落特征,了解微地形生境下土壤微生物群落变化趋势.研究结果表明,土壤微生物群落培养的平均颜色变化率(AWCD)增长曲线呈现中坡位>坡顶>下坡位>上坡位>坡底的规律,中坡位土壤微生物群落代谢活性最高,坡底土壤微生物群落对基质的利用能力最低;在土壤微生物多样性指数比较中发现,除McIntosh均一度指数变化不显著外,其余土壤微生物多样性指数在不同坡位上存在显著差异.其中,中坡位的Shannon丰富度指数及Simpson优势度指数最大,显著高于坡底指数值(P<0.05);对土壤微生物群落碳源利用特征分析,氨基酸类利用率变化明显大于其他碳源,而胺类及酚酸类的利用程度较低,表明氨基酸类是土壤微生物利用的主要碳源;通过主成分分析发现,不同坡位的土壤微生物群落对碳源利用具有选择性,糖类、氨基酸类、聚合物类及酚酸类是对土壤微生物群落功能多样性差异贡献较大的碳源.美国国家地理科研基金资助项目(9336-13);;福州大学科技发展基金资助项目(510211