ALBERT

Description: As one of the most destructive and costly natural disasters, drought has far-reaching negative effects on agriculture, water resources, the environment, and human life. Scientific understanding of propagation from meteorological to hydrological drought is of great significance for accurate forecasting of hydrological drought and preventing and mitigating drought disasters. The objective of this study is to analyze the spatio-temporal variational characteristics of propagation from meteorological drought to hydrological drought and the associated driving mechanisms in the eastern Qilian Mountains using the standard precipitation index (SPI), standardized runoff index (SRI), and drought propagation intensity index (DPI). The results show that there has been meteorological humidification and hydrological aridification in the upper reaches of the Shiyang River Basin over the last 56 years; especially in the 2000s, the intensity of hydrological drought was the strongest and the intensity of meteorological drought was the weakest, indicating the propagation intensity of meteorological drought to hydrological drought was extremely strong during this period. The changes of meteorological and hydrological dry–wet are different, both on seasonal and monthly scales. The meteorological dry–wet is shown to have had a significant effect both on the current and month-ahead hydrological dry–wet, where the one-month lag effect was most obvious. The relationship between meteorological and hydrological droughts also vary in space: Hydrological aridification in the Huangyang River, and the rivers east of it, was greater than that in the western tributaries. The drought propagation intensities from west to east showed a decreasing trend, excluding the Huangyang River. Climate and land-use changes are the main factors affecting the propagation from meteorological drought to hydrological drought. When the natural vegetation area accounted for between 76.3–78%, the cultivated land area between 0.55–3.6% and the construction area between 0.08–0.22% were a peer-to-peer propagation process from meteorological drought to hydrological drought in the upper reaches of the Shiyang River.

Description: The construction of a reasonable evaluation index system for low-carbon cities is an important part of China’s green development strategy in urban areas. In this study, based on the theoretical framework for the concept of low-carbon cities, the perspectives from three index systems—that is, the Drivers, Pressures, State, Impact, Response model of intervention (DPSIR), a complex ecosystem, and a carbon source/sink process—were integrated to extract common indicators from existing evaluation index systems for low-carbon cities. Subsequently, a standardized evaluation index system for low-carbon cities that contained five indicators—carbon emission, low carbon production, low carbon consumption, low-carbon policy, and social economic development—was established. Thereafter, Xiamen was selected for an empirical analysis by determining the indicator weight with an entropy weight method and by carrying out a comprehensive evaluation using a linear summation model. The results showed that the weights of the five selected primary indicators for the evaluation of low-carbon cities were: low-carbon production 〉 low-carbon consumption 〉 social economic development 〉 carbon emission 〉 low-carbon policy. Among the secondary indicators, the average entropy weight of “pollution emission” was the highest at 0.1591, while the average entropy weight of “urbanization rate” was the lowest at 0.0360. Furthermore, the comprehensive index of low-carbon development in 2015 was higher than that in 2010, while the rate of economic growth was greater than the growth rate of carbon emission, which indicated that the relative decoupling of economic growth from carbon emission was basically achieved.

Description: Living environment reconstruction in Wenchuan earthquake disaster-hit areas received substantial attention internationally, so it is imperative to examine out the methods employed, to evaluate community reconstruction and recovery performances. However, the existing evaluation systems for post-disaster reconstruction practices are mostly generalized models, and thus, the actual differences among various reconstruction modes and local characteristics are given insufficient attention. After 10 years of reconstruction and recovery, Dujiangyan, Beichuan, and Wenchuan have exhibited distinct differences and characteristics because of two different reconstruction modes: “paired assistance” and “self-construction”. Based on a thorough review of the literature and expert judgments, this article focuses on the introduction of evaluation factors comprising the opinions and requirements of disaster victims. Adopting the “four-step method” to select the evaluation factors through conceptual consolidation, analytical structuring, indicator identification, and index creation, this article summarizes the homogeneities and heterogeneities of the three different areas. The results reveal that people in different areas under the influences of different reconstruction modes and local characteristics will emphasize different evaluation factors and demonstrate different levels of concern for the same factor. This article analyzes the three areas and establishes an adaptable evaluation index system to provide scientific guidance to community recovery evaluations in different areas after major disasters.

Description: As translocation strategy has been pursued by cluster firms, two types of nonlocal subsidiaries, nonlocal manufacturing subsidiaries (NMS) and nonlocal R&D subsidiaries (NRS) contribute to their holding firms’ innovation in different ways. Prior studies have not paid much attention to the role of NMS and NRS, and how their effects are contingent on distance. To address this gap, this paper assesses the contribution of NMS and NRS on cluster firms’ innovation performance respectively and ascertains the moderating effect of geographical distance and social distance. The empirical investigation is conducted using a sample of 79 Chinese cluster firms. Our results indicate that both NMS and NRS have positively influenced cluster firms’ innovative performance. Moreover, geographical distance negatively moderates both the role of NMS and NRS. On the other hand, social distance only increases the influence of NRS on their holding firms’ innovation. Thus, spatial distance may hamper knowledge acquisition through NMS and NRS while loosely connected NRS would contribute more to their parent companies in local clusters. Our research contributes to the literature on cluster firms’ relocation strategy by clarifying the distinct role of NMS and NRS and recognizing the contingent effect caused by geographical and social distance.

Description: Epoxy asphalt (EA) concrete is widely used in constructing long-span steel bridge pavements (SBDPs). This study aims to derive a fatigue damage evolution law, conducting an experimental investigation of SBDP. First, a general theoretical form of the fatigue damage evolution law of materials is established based on the thermal motion of atoms. Then, fatigue experiments demonstrate that this evolution law well represents the known damage–life relationships of SBDP. Taking into account the experimental relationships between damage and fatigue life under symmetrical cyclic loadings with different overload amplitudes and temperature variations, a detailed damage evolution law is deduced. Finally, the role of damage accumulation is discussed on the basis of the proposed damage evolution law for the extreme situation of heavy overload and severe environments. The results show that both heavy loading and falling temperatures increase the fatigue damage of SBDP considerably. EA shows a fatigue life two to three times longer than that of modified matrix asphalt (SMA) or guss asphalt (GA). For the same thickness, EA pavement is demonstrated to be more suitable for an anti-fatigue design of large-span SBDP under high traffic flows and low temperatures.