中国电子信息制造业时空格局演化及影响因素

为探究后经济危机时期中国电子信息制造业的时空变化及其影响因素,基于基尼系数、空间相关性分析、负二项回归模型等方法,采用天眼查企业数据库以及相关城市统计年鉴数据,对2009－2018年中国电子信息制造业时空格局演化及影响因素进行分析,结果表明：1）中国电子信息制造业稳步发展,由出口导向转为内需拉动。2）企业主要集中在珠三角、长三角地区,长江中游城市群蓄势待发,中部及川渝地区的城市发展迅猛而东北地区陷入发展困境,企业空间分布存在显著的空间正相关关系。3）深圳、东莞等城市一直为产业重要集聚区,城市两级分化严重。3）总体上,企业更倾向于选址在产业协同集聚程度高、创新能力强、劳动力成本较高而经济后发城市;在城市群尺度,不同因素对不同城市群存在异质性,反映产业发展水平、特点存在很大差异,长三角企业偏好创新能力高、产业市场化水平高且交通基础设施完善的城市,珠三角企业偏好劳动力成本高的城市,京津冀城市偏好劳动力成本高且交通基础设施完善的城市,成渝地区企业偏好产业市场化水平高且创新能力弱的后发城市,长江中游城市偏好劳动力成本高的后发城市。     

Modelling hydrological response to a fully‐monitored urban bioretention cell

Municipalities and agencies use green infrastructure to combat pollution and hydrological impacts (e.g., flooding) related to excess stormwater. Bioretention cells are one type of infiltration green infrastructure intervention that infiltrate and redistribute otherwise uncontrolled stormwater volume. However, the effects of these installations on the rest of the local water cycle is understudied; in particular, impacts on stormwater return flows and groundwater levels are not fully understood. In this study, full water cycle monitoring data were used to construct and calibrate a two‐dimensional Richards equation model (HYDRUS‐2D/3D) detailing hydrological implications of an unlined bioretention cell (Cleveland, Ohio) that accepts direct runoff from surrounding impervious surfaces. Using both preinstallation and postinstallation data, the model was used to (a) establish a mass balance to determine reduction in stormwater return flow, (b) evaluate green infrastructure effects on subsurface water dynamics, and (c) determine model sensitivity to measured soil properties. Comparisons of modelled versus observed data indicated that the model captured many hydrological aspects of the bioretention cell, including subsurface storage and transient groundwater mounding. Model outputs suggested that the bioretention cell reduced stormwater return flows into the local sewer collection system, though the extent of this benefit was attenuated during high inflow events that may have exhausted detention capacity. The model also demonstrated how, prior to bioretention cell installation, surface and subsurface hydrology were largely decoupled, whereas after installation, exfiltration from the bioretention cell activated a new groundwater dynamic. Still, the extent of groundwater mounding from the cell was limited in spatial extent and did not threaten other subsurface infrastructure. Finally, the sensitivity analysis demonstrated that the overall hydrological response was regulated by the hydraulics of the bioretention cell fill material, which controlled water entry into the system, and by the water retention parameters of the native soil, which controlled connectivity between the surface and groundwater.     

我国蚕桑丝织业探源

本文根据历史传说、古籍记载、考古发掘,阐述我国蚕丝织业的起源是多中心多源头的,并从蚕、桑生长的适宜生态环境分析,说明黄河中下游及长江下游地区为蚕桑丝织业发源地的合理性.     

Hydrothermal studies in a new diamond anvil cell up to 10 GPa and from −190°C to 1200°C

The new hydrothermal diamond anvil cell (HDAC) has been designed for optical microscopy and X-ray diffraction at pressures up to 10 GPa and temperatures between –190°C and 1200°C. Laser light reffected from the top and bottom anvil faces and the top and bottom solid sample faces produce interference fringes that provide a very sensitive means of monitoring the volume of sample chamber and for observing volume and refractive index changes in solid samples due to transitions and reactions. Synchrotron radiation has been used to make X-ray diffraction patterns of samples under hydrothermal conditions. Individual heaters and individual thermocouples provide temperature control with an accuracy of ±0.5°C. Liquid nitrogen directly introduced into the HDAC has been used to reduce the sample temperature to –190°C. The - phase boundary of quartz has been used to calculate the transition pressures from measured transition temperatures. With this method we have redetermined 5 isochores of H₂O up to 850°C and 1.2 GPa at which the solution rate of the quartz became so rapid that the quartz dissolved completely before the - transition could be observed. When silica solutions were cooled, opal spherules and rods formed.     

常州市农业产业对生态环境的影响及治理对策

作为长江流域传统农业生产大市的常州，随着农业产业结构调整的不断推进，其生态环境的可持续发展正面临着严峻挑战。通过对常州市水质、土壤、空气、声等农业生态环境质量现状的实地调查分析，结合该地各农业产业对生态环境造成污染的不同特点，提出如要从根本上治理农业生态环境污染，农业产业布局的调整是非常重要的一个方面，并对此作了新的布局规划；此外，还指出完善环境管理和改善生产技术也是治理生态环境污染的两个重要对策。     

Rural diversification and socio-economic transformation in Croatia

Rural diversification in Croatia is well advanced because many rural families have been able to find work in secondary and tertiary activities without the need to migrate to the towns. Many rural settlements have now attained an urban character although there are regional variations, including a contrast between the continental zone with a relatively high level of commitment to agriculture and the coastal areas, with pronounced ‘deagrarisation’ where the ports and tourist resorts are well developed and the natural resource conditions for agriculture are poor. These variations are examined at the municipality level with reference to two key indicators: the share of nonagricultural population and the share of workers in the total active population. Four categories of socio-economic transformation are recognised: more urbanised, urbanised, less urbanised and rural. The main regional differences between the continental and coastal areas are confirmed with the latter showing a relatively high level of socio-economic transformation through the prominence of more highly urbanised municipalities. This revised version was published online in July 2006 with corrections to the Cover Date.     

Selection, distribution and way of development of leading industries in the Beijing Kowloon economic belt

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矿物和稀土在饲料工业中的应用

矿物质作为一种重要的饲料添加剂的作用日益为人们所重视。按其作用可划分为营养性添加剂（包括取自矿物中的钙、磷、镁、盐类物质等）以及非营养性添加剂（粘土类矿物、膨润土、海泡石、珍珠岩、蛭石及稀土元素等）。国内外信息表明,矿物饲料添加剂的开发与应用具有广阔的前景。     

浅议矿业权市场的宏观调控与资源配置

本文介绍了矿业权市场的基本框架,论述了矿业权市场宏观调控的重要意义、总体目标、调控手段及其运行机制。对资源配置方式及配置原则进行了探讨,并结合辽宁省情提出了具体建议。     

九孔鲍外套膜表皮细胞的超微结构

利用透射电镜观察九孔鲍（Haliotidaediversicoloraquatilis）的外套膜表皮细胞,结果表明细胞可分为4大类,即普通柱状表皮细胞、嗜碱性粒细胞、嗜酸性粒细胞和感觉细胞。它们在不同区域的分布、形态和数量变化与外套膜的功能分化密切相关。