乡村振兴导向下乡村发展能力的多维测度及时空交互特征

乡村振兴要求走乡村内生性发展道路,客观认知乡村发展能力的时空分异格局和交互关系对乡村振兴战略实施具有重要意义。本文从农业产业发展、农村基础建设和农民社会生活三个维度构建测度指标体系,并引入面板向量自回归模型识别影响乡村发展能力的敏感因素,以此测度乡村发展能力指数,进而采用探索性时空数据分析方法揭示乡村发展能力的时空交互特征。结果表明：(1)我国中部地区多维乡村发展能力提升,但呈明显的空间异质性,不同维度间差异化显著;(2)中部地区多维乡村发展能力局域空间格局呈现较强的动态性并整体表现出较强的空间依赖关系;(3)邻接地级市多维乡村发展能力的时空交互网络以正向关联为主,局部空间呈差异化的竞合态势。     

Flexural Behavior of Typical Chinese Traditional Timber Stitching Beams

In Chinese traditional timber buildings, stitching is very common. When the bearing capacity or the rigidity is inadequate, a timber beam is often strengthened with another beam using the stitching method. The timber stitching beams are mainly of two types—the small-top/big-bottom type and the big-top/small-bottom type. To study the bending behavior of these two types of timber stitching beams, including the failure mode, the flexural capacity, the strain distribution at mid-span section, and the maximum deflection, bending tests are carried out on 14 timber stitching beams with Chinese traditional conformation for seven pine beams and seven fir beams. The results show that the failure modes of the small-top/big-bottom type of stitching beams all show brittle fractures at the bottoms of the bottom beams. The failure modes of the big-top/small-bottom type of stitching beams all show brittle fractures at the bottoms of the top beams. The distribution of section strain along the height of each part of the beam basically obeys plane hypothesis. Based on the theoretical and experimental analysis, the calculation formulas of flexural capacity and maximum deflection of these two types of timber stitching beams made of pine and fir are presented.     

A Model for Assessing the Reuse of an Ancient Place of Performance: The Bouleuterion of Teos

Ancient places of performance are often considered for reuse as a means of promoting archaeological sites. Therefore, local authorities and decision makers have a difficult task of balancing the conservation and management of the sites with the carrying capacity. In this paper, the bouleuterion, a ‘rediscovered’ structure, at the Teos archaeological site, in Turkey is evaluated and presented as a preliminary case study with the hopes that these issues will be taken into consideration by the managing body in the creation of a management plan for the site. The evaluation is made by assessing socio-economic and intangible heritage significance, policies guiding changes at the site, a qualitative survey at the site and by defining the structure’s carrying capacity. The site’s strengths, weaknesses, opportunities, and threats are used to create criteria and make proposals for its reuse. The study concludes that the bouleuterion cannot be reused as a venue in its present condition and makes recommendations for future use.     

汉文化对吐鲁番地区少数民族的影响——基于对《吐鲁番出土文书》中容量单位的考察

吐鲁番是一个多民族聚居、多种文化交汇的地区。本文根据《吐鲁番出土文书》和山田信夫刊布的回鹘文文书的记载,从容量单位的角度探讨汉文化对该地区少数民族经济生活的深远影响。     

Gas breakthrough experiments on fine-grained sedimentary rocks

The capillary sealing efficiency of fine‐grained sedimentary rocks has been investigated by gas breakthrough experiments on fully water saturated claystones and siltstones (Boom Clay from Belgium, Opalinus Clay from Switzerland and Tertiary mudstone from offshore Norway) of different lithological compositions. Sand contents of the samples were consistently below 12%, major clay minerals were illite and smectite. Porosities determined by mercury injection lay between 10 and 30% while specific surface areas determined by nitrogen adsorption (BET method) ranged from 20 to 48 m² g ^{? 1}. Total organic carbon contents were below 2%. Prior to the gas breakthrough experiments the absolute (single phase) permeability (k_abs) of the samples was determined by steady state flow tests with water or NaCl brine. The k_abs values ranged between 3 and 550 nDarcy (3 × 10^?21 and 5.5 × 10^?19 m²). The maximum effective permeability to the gas‐phase (k_eff) measured after gas breakthrough on initially water‐saturated samples extended from 0.01 nDarcy (1 × 10^?23 m²) up to 1100 nDarcy (1.1 × 10^?18 m²). The residual differential pressures after re‐imbibition of the water phase, referred to as the ‘minimum capillary displacement pressures’ (P_d), ranged from 0.06 to 6.7 MPa. During the re‐imbibition process the effective permeability to the gas phase decreases with decreasing differential pressure. The recorded permeability/pressure data were used to derive the pore size distribution (mostly between 8 and 60 nm) and the transport porosity of the conducting pore system (10^‐5–10^‐2%). Correlations could be established between (i) absolute permeability coefficients and the maximum effective permeability coefficients and (ii) effective or absolute permeability coefficients and capillary sealing efficiency. No correlation was found between the capillary displacement pressures determined from gas breakthrough experiments and those derived theoretically by mercury injection.     

The role of the stress regime on microseismicity induced by overpressure and cooling in geologic carbon storage

Fluid injection in deep geological formations usually induces microseismicity. In particular, industrial‐scale injection of CO₂ may induce a large number of microseismic events. Since CO₂ is likely to reach the storage formation at a lower temperature than that corresponding to the geothermal gradient, both overpressure and cooling decrease the effective stresses and may induce microseismicity. Here, we investigate the effect of the stress regime on the effective stress evolution and fracture stability when injecting cold CO₂ through a horizontal well in a deep saline formation. Simulation results show that when only overpressure occurs, the vertical total stress remains practically constant, but the horizontal total stresses increase proportionally to overpressure. These hydro‐mechanical stress changes result in a slight improvement in fracture stability in normal faulting stress regimes because the decrease in deviatoric stress offsets the decrease in effective stresses produced by overpressure. However, fracture stability significantly decreases in reverse faulting stress regimes because the size of the Mohr circle increases in addition to being displaced towards failure conditions. Fracture stability also decreases in strike slip stress regimes because the Mohr circle maintains its size and is shifted towards the yield surface a magnitude equal to overpressure minus the increase in the horizontal total stresses. Additionally, cooling induces a thermal stress reduction in all directions, but larger in the out‐of‐plane direction. This stress anisotropy causes, apart from a displacement of the Mohr circle towards the yield surface, an increase in the size of the Mohr circle. These two effects decrease fracture stability, resulting in the strike slip being the least stable stress regime when cooling occurs, followed by the reverse faulting and the normal faulting stress regimes. Thus, characterizing the stress state is crucial to determine the maximum sustainable injection pressure and maximum temperature drop to safely inject CO₂.     

山东省土地生产潜力与环境人口容量研究

通过分析山东省土地资源的数量、质量及利用结构的潜力和预测山东省的人口,进行土地生产潜力与环境人口容量研究,为充分发挥土地潜力提高山东省土地环境的人口容量提供科学依据。     

论唐代的封驳制度

唐代以封还皇帝诏命为对象的封驳制度渊源于两汉,酝酿于初唐,形成于唐代中后期,主要由门下省官员给事中职掌。封驳的目的在于追救缺失,防患于未然,而封还诏敕并加以驳正则是其最主要的方式。在权力高度集中的封建皇权社会,封驳制度在加强权力监督、抑制皇权膨胀等方面无疑有着积极的意义,然而这种作用也不宜高估,唐代中后期三省制的破坏在很大程度上妨碍了封驳作用的发挥,而当政者能否接受逆耳之言、给事中能否履行职责也同样决定着封驳作用的发挥。     

Fighting over the Forests: Environmental Conflict and Decision‐making Capacity in Forest Planning Processes

This paper tells a story of environmental conflict and the attempted political resolution of issues of planning for native forests in Western Australia. It refers to the Western Australian Regional Forest Agreement and Draft Forest Management Plan processes to demonstrate how a range of actors utilise vari‐ous discourses and network relations in attempts to influence governmental decision‐making capacity. Adapting elements of a model of capacity‐building for environmental decision‐making, the paper indicates how traditional exclusionary decision networks serve to inhibit decision capacity, whilst more inclusive processes may be more likely to cope with challenges of reconciling multiple values and decision‐making for managing the forests in the interests of society as a whole.     

基于旅游生产线的景区容量算法

现行的风景区空间日容量的计算方法往往大大高估了景区容量。本文以游客在景区中的移动行为为出发点,将景区旅游线路类比为旅游生产线,其中游客为工件、景点为工序。利用旅游生产线的平行移动特征,推导出在景区日开放时间内能够完成景区游玩的游客批数。然后,以景区线路中的瓶颈景点容量为批量,该批量与批数相乘即得到了景区容量。旅游生产线理论填补了景区容量计算理论支撑的空白,并使景区容量计算真正的科学化、合理化。