A 421-d activity cycle in the BeX recurrent transient A0538–66 from MACHO monitoring

We present a ∼5-yr optical light curve of the recurrent Be/X-ray transient A0538–66 obtained as a by-product of the MACHO Project. These data reveal both a long-term modulation at P =420.8±0.8 d and a short-term modulation at 16.6510±0.0022 d which, within errors, confirms the previously found orbital period. Furthermore, the orbital activity is only seen at certain phases of the 421-d cycle, suggesting that the long-term modulation is related to variations in the Be star envelope.     

Land Cover Changes and Drivers in the Water Source Area of the Middle Route of the South-to-North Water Diversion Project in China from 2000 to 2015

The Middle Route of the South-to-North Water Diversion Project(MR-SNWDP) in China, with construction beginning in 2003, diverts water from Danjiangkou Reservoir to North China for residential, agriculture and industrial use. The water source area of the MR-SNWDP is the region that is most sensitive to and most affected by the construction of this water diversion project. In this study, we used Landsat Thematic Mapper(TM) and HJ-1 A/B images from 2000 to 2015 by an object-based approach with a hi...     

Mt. Suhora M dwarf survey - Detection of eight short-period variable stars

The Mt. Suhora M dwarf survey searching for pulsations in low mass main sequence stars has acquired CCD photometry of 46 M dwarf stars during the first year of the project (Baran et al., 2011). As a by-product of this search hundreds field stars have been checked for variability. This paper presents our initial result of a search for periodic variables in field stars observed in the course of the survey. On the basis of the periodicity and the shape of the light curves, eight new variables has been detected, among which five are δ Scuti stars and three likely RR Lyrae stars. Although variation in one of the stars has been previously detected, it was classified incorrectly. To support our classification, in August 2010, we performed spectroscopic observations to derive spectral types and luminosity classes for all eight variable stars.     

遥感技术在深圳-大亚湾沿海高速公路工程地质调查及选线中的应用

应用计算机增强和特征信息提取技术,结合航空摄影图像的立体观察对比,对卫星TM数字图像地学信息进行解译研究,并通过野外调查验证,对深圳-大亚湾沿海高速公路沿线工程地质环境进行了迅速评价,经计算机不同处理方法处理获得的TM专题信息图像在进行地质构造解译和岩土体分类中均起到重要作用,而航片在地质体边界圈定和详细定位以及灾害地质现象分析方面效果较好。在不到两个月的时间里就完成了该项目从图像处理、解译到野外调查和成图及报告编写的全过程工作,节约勘察资金50%以上,满足了公路勘查前期工作的需要,也充分体现了遥感技术的优越性。遥感解译研究与常规地质调绘方法相结合,可取得事半功倍的效果,也是公路勘察手段现代化的标志和必经之路。     

土地基础数据库建设探讨

国土资源信息化建设中的"瓶颈"-土地基础数据库建设中存在着较多的实际问题,本文分析了土地基础数据库建设中的主要技术问题,基于建库实践,提出了建库技术路线,以期抛砖引玉,推进信息化建设。     

路线上任意点方位的计算

路线的方位角对于边桩坐标、结构物点坐标的计算很重要，本文详细地介绍了在不同线型路线上任意点．的方位角计算方法，给出了计算公式。     

Multi-criteria,personalized route planning using quantifier-guided ordered weighted averaging operators

This paper presents a generic model for using different decision strategies in multi-criteria, personalized route planning. Some researchers have considered user preferences in navigation systems. However, these prior studies typically employed a high tradeoff decision strategy, which used a weighted linear aggregation rule, and neglected other decision strategies. The proposed model integrates a pairwise comparison method and quantifier-guided ordered weighted averaging (OWA) aggregation operators to form a personalized route planning method that incorporates different decision strategies. The model can be used to calculate the impedance of each link regarding user preferences in terms of the route criteria, criteria importance and the selected decision strategy. Regarding the decision strategy, the calculated impedance lies between aggregations that use a logical “and” (which requires all the criteria to be satisfied) and a logical “or” (which requires at least one criterion to be satisfied). The calculated impedance also includes taking the average of the criteria scores. The model results in multiple alternative routes, which apply different decision strategies and provide users with the flexibility to select one of them en-route based on the real world situation. The model also defines the robust personalized route under different decision strategies. The influence of different decision strategies on the results are investigated in an illustrative example. This model is implemented in a web-based geographical information system (GIS) for Isfahan in Iran and verified in a tourist routing scenario. The results demonstrated, in real world situations, the validity of the route planning carried out in the model.     

Ad hoc shared‐ride trip planning by mobile geosensor networks

Recent developments in miniaturization of computing devices, in location‐sensing technology and in ubiquitous short‐range wireless networks enable new types of social behaviour. This paper investigates one novel application of these technologies, ad hoc inner‐urban shared‐ride trip planning: Transportation clients such as pedestrians are seeking ad hoc shared rides from transportation hosts such as private automobiles, buses, taxi cabs or trains. While centralized trip planners are challenged by assigning clients and hosts in an ad hoc manner, in particular for non‐scheduled hosts, we consider the transportation network as a mobile geosensor network of agents that interact locally by short‐range communication and heuristic wayfinding strategies. This approach is not only fully scalable; we can also demonstrate that with short‐range communication, and hence, incomplete transportation network knowledge a system still can deliver near‐to‐optimal trips.     

Narratives of the Mother Road: Geographic Themes Along Route 66

One of the most culturally significant roads in the world, U.S. Highway 66 (commonly referred to as Route 66) has connected Chicago and Los Angeles since 1926. In order to explore what heritage themes Route 66 sites convey to tourists, we assessed the information presented to visitors at nearly four‐dozen museums and interpretive sites astride the road using the qualitative software Nvivo 10. Five themes dominate interpretation. Route 66 thematically flows east to west with Chicago as the beginning and Los Angeles as the end of the road. Mobility and personal freedom of movement via the automobile are encapsulated in the history of the road. In addition, Route 66 highlights nostalgia for the 1950s with classic American automobiles, music of the era, and neon lights representing this golden age of the highway. Economic decline, and often the economic continuity of communities, is frequently found in interpretive materials. Finally, Route 66 museums are repositories of community memory as oral histories preserve the narratives of individuals and families who owned businesses on and lived near the road for multiple decades. We conclude with several observations about interpretative themes that are overlooked as well as regional differences in the geography of memory along Route 66.