惠州潼湖湿地植被及植物资源的研究

惠州潼湖湿地位于惠州市西部,地理位置北纬22°59’54"-23°02’04",东经114°10’15"-114°15’55"。湿地面积2654．8 hm2,有3种湿地类型,以湖泊湿地、库塘湿地为主,间有河流湿地。该湿地维管植物64科155属203 种．文章分析了湿地维管植物的生态习性、群落特征和入侵植物等,提出了湿地植被保护的重要性和保护建议。     

河南虞城方言中的“嘞”

虞城位于河南省东南部,地处黄淮平原腹地,介于东经114°49’-116°39’、北纬33°43’-34°52’之间,属商丘市。北邻山东单县,东接砀山县,南连安徽亳州,西与商丘市相接。     

西双版纳的热带雨林奇观

西双版纳位于云南省西南部,处于我国大陆西南边陲,与老挝、缅甸毗邻。“西双”傣语为“十二”,“版纳”意为坝子,西双版纳即为十二块大的坝子。其所处地理位置为21°8′N～22°35′N,99°57′E～101°50′E之间,在     

一题一议

[题目一]图1是全球昼夜状况分布图(AB是昏线),A地此日正午太阳高度为46°,读图回答下列两题。1.此时太阳直射点的坐标是:A.(120°E,23°N)B.(60°W,23°N)C.(120°E,23.5°N)D.(60°W,23.5°N)2.若图中D点此时的太阳高度是10°,则D点的地理纬度和正午太阳高度     

一题一议

[题目一] 一架飞机在当地时间1时30分从乙地（150°W、60°N）处起飞时太阳正好在地平线上,飞机朝正西飞,到达甲地（150°E、60°N）时看见太阳又在地平线附近。请问飞机飞行时间有多长：     

如何真正“读”懂经纬网图

一、经纬度的判定 1．简单型 就大部分学生学习情况而言,对已标出本初子午线（0°经线）和赤道（0°纬线）的经纬网图,要判定某点的经纬度,应该不成问题,只要牢记两点,问题就迎刃而解。①0°经线以东是东经（E）,以西是西经（W）;0°纬线以北是北纬（N）,以南是南纬（S）。②任何两条经（纬）线之间间隔的度数是相等的。如图1,D点的经度为60°E,纬度为600S;E点的经度为60°W,纬度为30°S。     

巧解难得 常规易求

2012年陕西省中考数学试题第25题,不但题型新颖,而且解题方法有所创新,对于开拓学生知识视野,促进思维的角度,丰富解题策略有积极的推动作用.原题是:如图,正三角形ABC的边长为3+3^1/2.（1）如图①,正方形EFPN的顶点E、F在边AB上,顶点N在边AC上,在正三角形ABC及其内部,以A为位似中心,作正方形EFPN的位似正方形E′F′P′N′,且使正方形E′F’P’N′的面积最大（不要求写出作法）.（2）求（1）中作出的正方形E′F’P’N′的边长;（3）如图②,在正三角形ABC中放入正方形DEMN     

一种白色有机电致发光器件

制作了一种白色有机电致发光器件．薄层荧光染料4-（dicyanomethylene）-2-t-butyl-6-（1，1，7，7-tetramethyljulolidyl-9-enyl）（DCJTB）放在两层N，N’-diphenyl—N，N’-bis（1-naphthyl）-（1，1’-biphenyl）-4，4’-diamine（NPB）间．Tris（8-hydroxyquinoline）aluminum（Alq）和4，7-diphenyl-1，10—phenanthroline（Bphen）分别用作电子传输层和激子阻挡层，NPB用作空穴传输层．4，4’，-bis（2，2’-diphenylvinyl）-1，1’-biphenyl（DPVBi）作为蓝光发光层，quinacridone（QAD）掺杂到Alq作为绿光发光层．Bphen的厚度影响到整个器件的亮度、效率和颜色，通过调节Bphen层的厚度，可以得到相当纯正的白光，当Bphen的厚度为4nm时，其色坐标为（0．32，0．34）．     

浅述参加安徽省“国培计划”对我专业发展的提高

教育部、财政部从2010年起实施＂中小学教师国家级培训计划＂。安徽省教育厅、财政厅结合省中小学教师队伍建设实际,组织实施＂‘国培计划’——安徽省农村初中骨干教师‘赢在课堂’远程培训项目（2010）＂,该项目以示范引领、“雪中送炭”和促进改革为宗旨,通过项目实施,帮助农村初中骨干教师解决教育教学中的实际问题,掌握课堂教学技能,提高课堂教学能力,提高教师队伍整体素质。     

腾冲县降水丰沛成因分析

腾冲县位于云南省保山市西南部,西部与缅甸毗邻,历史上曾是古西南丝绸之路的要冲。腾冲位于东经115°40’—116°17’,北纬26°05’—27°08’之间,在气候上属亚热带高原型季风气候,一年分为雨季(5-10月)和旱季(11-4月),冬无严寒、夏无酷暑。最冷月(1月)平均气温9.2℃,最热月(8月)平均气温20.6℃。冬季干燥,日照时间长,夏季多雨潮湿。年平均降雨量1565mm左右,年平均气温15.9℃,平均相对湿度73%。每年4月份降水开始增多,5月份正式进入雨季一直持续到10月份。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.