应用改进Hill估计计算在险价值

通过广义最小二乘法对Hill估计进行改进,估计尾部指数,克服了传统的Hill估计对样本阈值依赖的缺陷,并将此法应用到了在险价值的计算上。由于传统的计算方法带来一些系统误差,对其进行了一些修正,并对中国的上证指数、恒生指数、道琼斯指数、纳斯达克指数,以及日经指数做了在险价值的计算,进行了比较和分析。     

Stability and boundedness properties of certain second-order differential equations

In this paper, we investigated the differential equation

     

明代易州山厂略论

明代为了获取燃料,明朝政府曾在山林资源丰富的山区开设山厂,采伐木植以烧制柴炭。易州地处北京西南部的太行山区,自古以来山林资源就极为丰富,且距离京城较近,因而成为理想的柴炭采办地。明代在此开设易州山厂,并设立提督易州山厂一职专门负责管理柴炭采办事宜。易州山厂自宣德年间设立,直至嘉靖初年,期间经历多次地点迁移和管理体制上的变革,且一直是明代内府柴炭的主要来源地。得益于易州山厂的发展,很大程度上解决了明代京城的柴炭供应问题。而易州山厂对明代边地生态、防务的危害,以及由此产生的一系列管理体制上的弊端,也是不可忽视的。     

How to repair the Hill cipher

INTRODUCTION Owing to the advance in network technology, information security is an increasingly important problem. Popular application of multimedia tech- nology and increasingly transmission ability of net- work gradually leads us to acquire information di- rectly and clearly through images. Hence, data secu- rity has become a critical and imperative issue. Hill cipher is a block cipher that has several advantages such as disguising letter frequencies of the plaintext, its simplicity be…     

湖北团风大崎山苔藓植物名录

团风大崎山森林公园位于湖北省东部,大别山南麓,长江中下游北岸,通过对200余号标本的整理及鉴定,初步统计出团风大崎山共有苔藓植物26科46属98种,其中苔类植物8科8属10种,藓类植物18科38属88种。     

独辟蹊径独抒性灵 --明袁宏道《虎丘记》的闲暇式阅读

作者写虎丘,取景独具只眼,立意奇警,其浓彩泼墨的焦点不在林泉幽壑,名胜古迹,而重在市民郊游和中秋度曲、听曲的世俗风情.句句写实,却见翻变妙构和奇思神韵,富有雅、俗得兼的美致.俗之美,在人众,在繁闹,在入情,在新艳;雅之美,在曲高和寡,在寂然幽静,在陶醉销魂,在清声响彻.作者“信口而出,信口而谈“,表现了“独抒性灵,不拘格套“的创作风格和审美指向.     

唐代中国诗词对日本词作发端的影响

早在中国的唐代,词刚刚出现之初即已传入日本。综观一千多年前日本词学的起步阶段,有两组中国词起到了决定性作用,这就是张志和的《渔父》五首和白居易的《忆江南》三首。正是在它们的影响下,日本诗人开始了词的创作,其中包括嵯峨天皇的《渔歌》以及有智子公主和滋野贞主的奉和之作,还有兼明亲王的《忆龟山》,此外还有一组越调诗也颇值得关注。与此同时,中国的唐诗从内容上也滋养了日本词的创作。     

浙江畲族80年文化变迁——《浙江景宁县敕木山畲民调查记》回访调查

1929年夏天,史图博和李化民在浙江景宁敕木山村作畲族文化调查研究。时隔83年后回访敕木山村,从饮食、服饰、建筑和民歌等四个方面来调查畲族传统文化变迁。由于政府政策作用和社会经济发展等因素,畲族生活饮食和建筑等方面在向现代生活方式方向发展,而服饰和民歌等方面传统文化正面临传承危机和保护发展等问题。     

Soundscape of the West Lake Scenic Area with profound cultural background—a case study of Evening Bell Ringing in Jingci Temple,China

From the case study of Evening Bell Ringing at Nanping Hill,one of the West Lake Cultural Landscapes in Hangzhou,China,we investigated the soundscape of a scenic area with a profound cultural background.First,we conducted the soundscape physical index of the area in both winter and spring seasons to analyze its objective graphical expression.Second,we focused on people’s reactions to the soundscape in order to obtain a subjective evaluation of each component in the soundscape and integrated environment.Then,the relationship between the objective data and the subjective evaluation was analyzed.Finally,the impacts of the natural environment,history,and cultural factors on the evaluation of the Jingci Temple soundscape were studied.It was found that natural sounds,cultural sounds,and historic sounds were widely acclaimed in people’s subjective feelings,which indicated the close relationships among historical and cultural background,soundscape,and natural environment.Thus,the conclusion was made that soundscape should be consistent with the local natural environment and the historical and cultural background.     

论《夜归鹿门歌》中对比手法的运用

《夜归鹿门歌》是唐代孟浩然创作的一首七言古诗。诗人通过夜归鹿门的所见所闻所感,抒发了自己的隐逸情怀。从艺术上看,此诗八句四联,通过多角度对比,诗人表现了自己的归隐之心。