S142电离氢区──分子云复合体的红外发射研究

本文使用ＩＲＡＳ巡天数据的最新版本ＩＲＡＳ巡天图（ＩＳＳＡ─ｃｏａｄｄｅｄ），经过进一步处理，得到了Ｓ１４２复合体红外发射的强度、温度及尘埃的分布。分析结果表明，分子云复合体的红外发射（在３０角分的尺度范围内）总光度１．１×１０４Ｌ⊙，红外连续发射在１２μｍ和１００μｍ有着较大的延伸，热而小的尘埃微粒的平均色温是１７０Ｋ，冷而大的尘埃平均色温为２９Ｋ，尘埃粒子密度随着对于最大值位置的偏移而迅速下降，ＨⅡ区内尘埃是严重衰减的。     

昌平南口山前断裂断层分段的地震学特征

利用北京昌平南口地区的地震活动性、震源参数与介质特性等对南口山前断裂进行断层分段，结果表明该断层各段的地震学特征差异明显，与地质学手段所得到的部分结果是一致的     

Scaling of foreign attractiveness for countries and states

People’s behavior on online social networks, which store geo-tagged information showing where people were or are at the moment, can provide information about their offline life as well. In this paper we present one possible research direction that can be taken using Flickr dataset of publicly available geo-tagged media objects (e.g., photographs, videos). Namely, our focus is on investigating attractiveness of countries or smaller large-scale composite regions (e.g., US states) for foreign visitors where attractiveness is defined as the absolute number of media objects taken in a certain state or country by its foreign visitors compared to its population size. We also consider it together with attractiveness of the destination for the international migration, measured through publicly available dataset provided by United Nations. By having those two datasets, we are able to look at attractiveness from two different perspectives: short-term and long-term one. As our previous study showed that city attractiveness for Spanish cities follows a superlinear trend, here we want to see if the same law is also applicable to country/state (i.e., composite regions) attractiveness. Finally, we provide one possible explanation for the obtained results.     

Models of molecular outflows

In this contribution, I present a broad historical review of the various hydrodynamical models that have been considered for explaining molecular outflows, and of their merits and failures when compared with observations. Wind-driven bubbles, viscous jet mixing-layers, and jet bowshocks, are discussed in turn. Most general properties of outflows can be understood in terms of a simple bowshock model. However, the detailed structure of outflows is more complex and not yet fully understood, given the presence of time variability in the jet velocity and/or direction. Finally, I discuss constraints on wind properties (momentum, mass-loss rate, radius) that can be derived from molecular outflows driven by jet bowshocks.     

Big location‐based social media messages from China's Sina Weibo network: Collection,storage, visualization,and potential ways of analysis

China's social media platform, Sina Weibo, like Twitter, hosts a considerable amount of big data: messages, comments, pictures. Collecting and analyzing information from this treasury of human behavior data is a challenge, although the message exchange on the network is readable by everyone through the web or app interface. The official Application Programming Interface (API) is the gateway to access and download public content from Sina Weibo and is used to collect messages for all mainland China. The nearby_timeline() request is used to harvest only messages with associated location information. This technical note serves as a reference for researchers who do not speak Mandarin but want to collect data from this rich source of information. Ways of data visualization are presented as a point cloud, density per areal unit, or clustered using Density‐Based Spatial Clustering of Applications with Noise (DBSCAN). The relation of messages to census information is also given.     

和原行星状星云成协的致密反射星云

对从IRAS点源表中选择出来的原行星状星云的光学证认和有缝光谱、CCD直接成像观测表明,其中三个与致密的反射星云成协,即PPN No.34=IRAS16559—2957、PPN No.35=IRAS16552—3050和PPN No.38=IRAS17150—3224。本文根据球对称尘埃壳层模型,计算了中心星光度和颜色的变化,反射星云的可见期等。认为近距的原行星状星云在早中期阶段将有致密的反射星云与它成协。     

基于流媒体技术的应急视频广播系统

地震发生后,迅速将应急情况、灾情信息传达到各级政府、各相关单位,将提高应急救援效率,减轻地震灾害损失。采用基于流媒体技术的应急视频广播系统,各级应急单位和人员使用普通电脑就可以进行应急视频的接收,第一时间了解应急及灾情信息。     

气象远程教育培训系统省级站的构建及应用

概述了气象远程教育培训系统省级站在职工教育培训方面的重要性,介绍了气象远程教育培训系统省级站构建的设计功能与目标,提出了气象远程教育培训系统省级站在网络结构、网络安全、设备选型等方面的技术方法,解读了分布式视频服务器软件、流媒体课件录制软件的功能和实用技术,并通过实例,说明了省级远程教育培训系统在加强气象职工教育培训、提高气象职工素质方面所发挥的积极作用。     

Crushed recycled glass as a filter medium and comparison with silica sand

The objective of this work was to evaluate crushed recycled glass as a medium for rapid filtration. In the first part of this work, physical and hydraulic characteristics of the glass medium were studied. In the second part, pilot scale inline filtration experiments were carried out using raw waters from three different water sources. Two physically identical filter columns were operated in parallel in all the experiments. One filter contained a silica sand medium that is widely used in Turkey, whereas the other filter contained crushed recycled glass. Experiments were repeated five times as follows: (i) Without the use of a coagulant, (ii–iii) with 5 mg/L and 10 mg/L of alum, and (iv–v) with 5 mg/L and 10 mg/L of ferric chloride. Turbidity, particle counts, and head losses were measured and compared as functions of time. The following were observed: (1) Provided that a coagulant was used, the filter containing crushed glass produced effluent turbidities and particle counts similar to those obtained with the sand filter. (2) The crushed glass medium generated both a smaller clean‐bed head loss and smaller clogging head losses than those of the sand filter. It is concluded that crushed glass shows significant promise as an alternative to silica sand in rapid filtration.     

东南极拉斯曼丘陵硼硅酸盐矿物组合硅硼镁铝矿-硼柱晶石-电气石的形成过程及其岩石学意义

东南极拉斯曼丘陵长英质片麻岩中产出大量的电气石-硼柱晶石-硅硼镁铝矿之硼硅酸盐矿物组合,这些矿物(电气石除外)的形成晚于变质峰期一般的硅酸盐矿物.电气石可多次出现,硅硼镁铝矿之后形成硼柱晶石,很少见两种以上的硼硅酸盐矿物能够同时结晶,各种硼硅酸盐矿物在同一期、甚至同一阶段内呈递进关系.在硼硅酸盐矿物的结晶过程中,B2O...