Status and outlook of hiking trails in the central part of the Low Tatra Mountains in Slovakia between 1980–1981 and 2013–2014

This study presents a methodology for assessment of the condition of hiking trails (HTs) and their impact zones in the central part of the Low Tatra mountain range, based on comparison of two complex data sets gathered in 33 years apart. The first field investigation was performed in 1980 and 1981, and the second in 2013 and 2014. The main goal was to perform a landscape typology in order to assess the susceptibility of landscape complexes to occurrence of anthropogenic and natural destruction processes and to assess the condition and prospects of HTs and their impacts on the adjacent alpine environment. Landscape complexes were characterised by selected abiotic, biotic and technical parameters of HTs and their impact zones. Due to the high variability of these parameters over the length of the HTs, we had to decide on how to map them. This was done using a square grid with 100 m-sized cells. For each cell with HT, the parameters were assigned the typical value within that cell. In total, 26.3 km of HT were studied, stretching over 266 grid cells. On comparison of the two data sets, it was seen that, 64% (171 grid cells) display a generally positive condition, with 54% (143 grid cells) even exhibiting significant improvement or continuously positive state of their condition. 36% (95 grid cells) were in bad condition, including 3% (9 grid cells) whose state had deteriorated, and 2% (6 grid cells) whose state had significantly deteriorated, in the time between the two assessments.     

CT冠状动脉造影应用于急性胸痛临床实践研究进展

急性胸痛是一个重要的公共卫生问题,它可以造成高昂的医疗成本支出,并显著影响人民健康。急性冠脉综合征是急性胸痛血管性病变的主要原因,影像学检查可以快速、有效地对血管性病变进行排查诊断。本文主要就CT冠状动脉造影在急性胸痛中的临床实践做一综述。      

延吉市春季一次霾污染过程特征及成因分析

利用ERA-interim再分析资料、空气质量监测数据及常规气象观测数据,结合HYSPLIT后向轨迹模式对2019年3月18—20日延吉市出现的一次连续3d霾污染天气进行分析.结果表明:此次严重空气污染期间,低层受槽前西南暖湿气流影响,地面处于均压场控制下,低层950hPa存在明显逆温,利于污染天气的出现和发展.日最高...     

Geochemistry of Sediments from the Lopare Basin (Bosnia and Herzegovina): Implications for Paleoclimate, Paleosalinity, Paleoredox and Provenance

A combined inorganic and organic geochemical study was carried out on marls and mudstones collected from the Lower Miocene Lopare Basin, Bosnia and Herzegovina. A total of 46 samples collected from two boreholes, Pot 1 (depth of 193 m) and Pot 3 (depth of 344 m), showed that element abundances like boron (B), lithium (Li), strontium (Sr), uranium (U), chromium (Cr), nickel (Ni), magnesium (Mg), sodium (Na) and calcium (Ca) are much higher than average than in the upper continental crust (UCC). Chemical composition indicates at least two sources: (i) Mesozoic ophiolites occurring in the north of the investigated area, and (ii) dacito-andesitic pyroclastics (Mesozoic to Cenozoic). Lopare Basin sedimentation was influenced by strong evaporation resulting in a partly hypersaline lake, which formed during a warm climatic period, probably during the Miocene Climatic Optimum. A brief episode of humid climate conditions resulted in the basin filling-up and deposition of felsic sediments enriched in thorium (Th). Organic geochemistry shows that the majority of studied sediments contains predominantly immature to marginally mature algal organic matter (OM). The biomarker patterns are generally in agreement with the geological history of the Lopare Basin and inorganic and mineralogical data. Conversely, the molecular distribution of n-alkanes as reliable climatic and δ-MTTC as paleosalinity indicators do not support this conclusion.     

重力数据在德令哈地区区域性综合解释中的开发应用研究

基于德令哈地区最新1∶25万重力数据,结合相关已知资料,进行了重力异常新提取和反演解释,研究表明,德令哈地区现今的重力异常特征能够反映基底构造.本文通过小波断裂分析方法,解释了14条区域性断裂构造,通过帕克法密度界面反演计算,划分了德令哈地区“五凹三隆”基底结构,明确了德令哈现今区域基底的隆凹格局,推断了基底隆起凹陷起...     

交替方向隐式时域有限差分算法的应用与发展

探讨了近年来出现的交替方向隐式时域有限差分法(ADI—FDTD)的应用和发展。该方法采用求解微分方程的交替方向隐式改进了FDTD算法，无条件稳定，时间步长不受Courant稳定条件的限制，从而节约了计算时间。提供了微带线电路、平行波导板等计算实例。同时针对ADI—FDTD内存占用量较大，数值色散增加等存在的不足，讨论了一些改进方法。     

约坝跋煲蛩胤治鲈?徐文体;王玉

制中心 广东广州510300,广州市疾病预防控制中心,广东广州510300登革热;;疫情;;流行病学因素目的分析2006年广州市登革热疫情,寻找病例发病后被及时报告的影响因素,为下一步疾病监测系统及早发现病例提供参考。方法通过对2006年广州市部分网络直报、现场调查和医院上报病例资料时     

基于加速遗传算法的投影寻踪模型在水质评价中的应用研究

提出将改进的实码加速遗传算法(RAGA)与投影寻踪评价模型(PPE)相结合,同时优化多维参数(投影方向),建立了多元数据分类与评价模型。对长春南湖水的营养状态做出了评价,取得满意效果,为水质分析与评价提供一种新的方法与思路。     

Neotethyan Evolution of the Ankara Mélange,Turkey: An Intraoceanic Subduction-Accretion System

<正>We report here new geochemical and geochronological data from mafic-ultramafic rock suites in the Ankara Mélange in north-central Turkey,and present a new tectonic model for its origin.Considered as one of most important relics of the Neotethyan realm in the region,the Ankara Mélange occurs between the Sakarya Continent     

TREND OF PRECIPITATION VARIATION IN HUBEI PROVINCE SINCE THE 1960S

1INTRODUCTIONOneoftheeffectsofglobalwarmingisthatprecipita-tionhasincreasedoversomeareasintheworld,andthegaugedataofprecipitation (excludingAntarctica)showthatglobalprecipitationhasincreasedslightlybyabout9mmforthe20thcentury, whichwas verysmallcomparedwiththeinterannualandmul-ti-decadalvariability(NEWetal.,2001).Butregion-ally,thereexisted agreatdealofdifferences,suchasinmostpartsofAfrica, Amazon,westernSouthAmerica,theweatherhasbecomedrier,andinmostpartsofEuropeandCanada,thereexisted…