时间:2022-09-21 06:43:32
导语:在长城介绍的撰写旅程中,学习并吸收他人佳作的精髓是一条宝贵的路径,好期刊汇集了九篇优秀范文,愿这些内容能够启发您的创作灵感,引领您探索更多的创作可能。
1、长城(The Great Wall),又称万里长城,是中国古代的军事防御工事,是一道高大、坚固而且连绵不断的长垣,用以限隔敌骑的行动。长城不是一道单纯孤立的城墙,而是以城墙为主体,同大量的城、障、亭、标相结合的防御体系。
2、长城修筑的历史可上溯到西周时期,发生在首都镐京(今陕西西安)的著名的典故“烽火戏诸侯”就源于此。春秋战国时期列国争霸,互相防守,长城修筑进入第一个,但此时修筑的长度都比较短。秦灭六国统一天下后,秦始皇连接和修缮战国长城,始有万里长城之称。明朝是最后一个大修长城的朝代,今天人们所看到的长城多是此时修筑。
3、长城资源主要分布在河北、北京、天津、山西、陕西、甘肃、内蒙古、黑龙江、吉林、辽宁、山东、河南、青海、宁夏、新疆等15个省区市。其中河北省境内长度2000多千米,陕西省境内长度1838千米。根据文物和测绘部门的全国性长城资源调查结果,明长城总长度为8851.8千米,秦汉及早期长城超过1万千米,总长超过2.1万千米。
4、1961年3月4日,长城被国务院公布为第一批全国重点文物保护单。1987年12月,长城被列入世界文化遗产。
(来源:文章屋网 )
1:长城介绍导游词英文
Everybody is good! Welcome to badaling scenic area tourism.
The Great Wall is one of the seven wonders of the world. It is the blood of the working people in ancient China, is also a symbol of ancient Chinese culture and the pride of the Chinese nation. Visitors, we have come to the famous badaling Great Wall, on both sides of the mountain, is the pine and cypress, like hidden-away east, birds sounds, gurgling streams, is full of poetic. To the distance, you can see the Great Wall is divided into south and north two peak, winding in the mountain ridges, long teng hu yue, spectacular, the scenery is very spectacular. The Great Wall built around the mountain, ups and downs, twists and turns. This period of the Great Wall of the wall is made of neat huge stone is some stone for up to 2 meters, weighing hundreds of pounds. Internal fill soil and stones, to the top of the wall where the ground covered square brick, very smooth. The wall of the lateral horse-refraining pits of building has 2 meters high, and have made a in, next shot mouth, for look and shooting. Every city wall, built a fortress of square ChengTai type. ChengTai have high low and high called the enemy, is the watchman sergeant and accommodation; Low called Taiwan, height and the wall was similar but prominent wall, have the crenel around, is where the patrol.
Badaling at an altitude of 1000 meters, the twists and turns of the Great Wall, such as the dragon take off on the mountains. It is not only a hardworking, the crystallization of the wisdom of the Chinese nation, is also an excellent representative of ancient architecture engineering. The badaling Great Wall, the distant, rolling hills, XiongChen, stiffness of the north to the mountain. Due to the Great Wall and grand Great Wall for to the mountain, to the mountain is more dangerous.
Here are the beacon tower, also known as beacons, Wolf yantai. Independent buildings is not connected to the Great Wall. Once the enemy pounce, communicate its kindle wars and light smoke during the day is called "ran, called flint fire at night. When the Ming dynasty, also on the relationship between the war with the enemy made a strict rules: the enemy hundreds, burning a smoke point a gun; Five hundred people, burning two smoke point two guns; More than one thousand people, three smoke SAN pao; More than five thousand people, four smoke four guns; More than ten thousand people, five five gun smoke. In this way, on the border of the military intelligence can rapid transfer to the imperial city ouchi. See the beacon tower, and then tell you a story, called "must play leud" : the zhou dynasty had a king named weeks you king, he has a beautiful woman, her temper is very strange, always don't smile, think of some way to you king. He lit up a distress signal (fire), as a result, drew leud come white, she laughed, you king is also very happy. But, really have an enemy to attack, you king lit the fire, but no one come, and he was killed by the enemy. There is a story, called "meng jiangnu cry Great Wall collapse" : legend was Meng Gusheng a daughter named meng jiangnu. Because of qin shi huang to build the Great Wall, need a lot of manpower. Qin shi huang was caught many people go to the Great Wall.
All of a sudden, I do not know where to come up to a rumor: only the wan xi is buried under the Great Wall, can make the Great Wall and solid, qin shi huang was, sent people seize wan xi. Wan xi good fled to Bangladesh. People see wan xi meng home good handsome, talented, good let meng jiangnu and wan xi of their marriage. The two men marry less than 10 days, good wan xi is the rulers who grasp to go to repair the Great Wall. In the fall, meng jiangnu saw her husband hasn't come back, give him the woolies. Along the way, reject, hardships, day and night, all the way to the Great Wall. Local people told her: wan xi good would have buried under the wall. She was grief-stricken, crying. Instantly, and dark, the Great Wall was crying collapsed in eight hundred. Just then, qin shi huang to have the Great Wall, with fine features, when he saw meng jiangnu just want her to do concubine. For qin shi huang meng jiangnu agree to her three conditions: one is for wan xi is a grave; The second is to make good full chao wenwu festivals wan xi; Three is in the middle of the Great Wall and the tomb of wan xi good repair a like flying grand bridge. After three things done, she threw herself into the sea.
Visitors, this is three stories about the Great Wall. Now the Great Wall tourist stop here, thank you!
2:长城介绍导游词英文
Good morning! My name is Chen Ying snow, carefree travel guide, today is a great pleasure to serve you, you can call me snow! Today we are going to visit the Great Wall of landscape is famous in the world. The Great Wall is the world's precious historical relics, hope everyone to love the Great Wall, don't litter scribble, oh!
The Great Wall has a long history, a history of more than 2000 years, the spring and autumn period and the warring states period, the warring states to mutual defense, has built the Great Wall in the dangerous place. According to records zuozhuan: in 656 BC, "chu mahjong layout" is about the earliest record of the Great Wall. Out the six nations after the unification of China, qin to defense the north south invasion of the huns, in 224 BC, the qin, zhao and yan in The Three Kingdoms of the north Great Wall, re-hung, coherent rise. Some west about (now min county, gansu province) north mountain, east to liaodong, which is commonly known as the "Great Wall", still remains. Since then, the han, the northern wei dynasty, their, beiqi, sui dynasties had built the Great Wall. The composition
In Ming dynasty, in order to defense the invasion of alien, built the Great Wall before and after 18 times, total length of 6700 km, east of shanhaiguan, west to jiayuguan, today we visit this section of the Great Wall is built in the Ming dynasty, is located in the badaling.
Now we have arrived at the foot of badaling. Tourists friends, please look up at the Great Wall: it is like a huge dragon, winding between mountains. Please follow me to the Great Wall, see: every three hundred meters on the walls of the Great Wall there is a square ChengTai, is an ancient fortress to station troops. It is said that war, between the ChengTai can mutual echo. On the top of the walls are covered with very flat square brick, like a wide road, probably ErSanTai car can be parallel. Outside the wall along with many more than two meters high, the rows of the crenel, for? With hope and shot. The composition
My friends, have a look at your feet? Guess what weigh? Tell you! This is a stone, a piece of have two or three one thousand catties! At that time, there is no train, automobile, also have no crane, is by the shoulder of countless countless hands, step by step, carry on the steep mountains. This is how many working people sweat and wisdom, to condense into the former does not see the head, after see the tail of the Great Wall!
This is the Great Wall! This is the west jiayuguan, east to shanhaiguan, which meet the sea sunrise and gobi desert sun, or turned on the peaks, or bent over in the valley, the ups and downs, stretching thousands of miles of the Great Wall. It is such a magnificent verve, Great Wall is a great miracle in the history of the world!
Dear visitors, today's visit here will be over, thank you very much for my support and cooperation. The majestic Great Wall forever awaits respectfully you the presence!
3:长城介绍导游词英文
Everybody is good! Welcome to badaling scenic area tourism. Accompany you visit together, today I am very happy, hope all can spend a good time in badaling.
Right now, I would go to visit the door
Badaling Great Wall, and now, I'll about matters needing attention: the Great Wall is one of the famous wonders of the world, it is like a dragon entrenched in north China's vast land. It is the crystallization of labor people's blood law in ancient China, is also a symbol of ancient Chinese culture and the pride of the Chinese nation, please don't scribble on the brick fluidized.
Visitors, now we have come to the famous badaling Great Wall, to the distance, you can see the Great Wall is divided into south and north two peak, winding in the mountain ridges, long teng hu yue, spectacular, the scenery is very spectacular. Look here is a two openings and u-shaped walls satin afraid brought to the barbican. Both inside and outside the barbican wall on both sides have the crenel wall, all defensive ring. If the enemy breached close into the city, will have been all around guarding city will panic in the enemy like fall in the urn. The barbican is an important part of the Great Wall. It is generally built on terrain dangerous traffic arteries. Badaling the barbican is no exception. Built on the ridge, restricted by terrain, mountain potential, low west high east, east narrow width, only 5000 square meters. There is no hole in the barbican, lack of water, usually few troops, guarding city forces in the northwest three mile fork city. Barbican in a "examine the courtyard mansion", the original is stay accommodation for the emperor passed in or officials. Barbican 63.9 meters apart, between the two door XiMenMei TiE "north gate lock-and-key", it meant I have spoken in front.
City on the doorway, ancient into install a huge double wooden door, door installation has wooden needle and latches. At ordinary times, both doors open and the pedestrian travel free access; Wartime gate closed, sealed hard; Once struck back order, city door is the export of hammering dashed forward. Barbican east gate lintel TiE as "the agent to fill", built during Ming jiajing eighteen years. Town "outside" the commonplace GuanCheng city on the stage, the original is embedded with a piece of stone, is the Ming wanli years of print. From the inscriptions could look around the Great Wall, has the more than 80 years time to complete. This tablet is a record of construction time, length of the Great Wall and the officer and tube foreman, burning head, head of the potter, mason head and name, in order to make clear the responsibility. Stand to look down on the city, we see in constant traffic and visitors through the door. Here is not only an important military defense of the ancient barrier, but also traffic arteries. From here, nantong changping, Beijing, north to yanqing, northwest to xuanhua, zhangjiakou, "convenient way from now on,". Badaling is hence the name.
When we came to linhai Great Wall, at the foot of the Great Wall, look up, the endless winding high steps, as if is a path to a blue sky of the ladder, and he seems like a dragon hou lie in rolling peaks.
Along the stairs up, came to the first gate "range gate", the ancient scene immediately appear at present, the gate is a two layers of ancient buildings, two sides of the ancients of flags fluttering, increased the antique appeal. The second floor is "clearly" lake mountain, standing there, "the east lake park" as a painting, panoramic view, I'd like to bring a "lake mountain" may be just that.
The walk, we came to the second gate "Gu Jing floor", standing on the roof of almost half of linhai city is clearly visible. Go up again, we finally boarded the highest floor of the Great Wall "Bai Yunlou", "finally finished!" I shouted happily. Standing on the "Bai Yunlou", panoramic view of the city, you see the white tower is the tallest building in linhai city, the distance of the "white band" is the yongning river to the sea.
2、然后就是叫物料员去仓库领用物料,俗称备料。
3、准备好物料以后,接着准备相应的工作夹具,作业指导书,如果是第一次生产的话,还要通知相关技术人员到现场指导。
4、物料都就绪以后,然后就安排生产人员进行生产。
5、将成品生产出来以后,再然后就是OQC品管进行质量检查,检查没有问题以后进行包装。
【关键词】脱硝技术 工艺选择 SCR脱硝 脱硝设计
中图分类号:TG333.7 文献标识码:A 文章编号:1009-914X(2013)35-266-01
1. 前言
我国是以燃煤为主的发展中国家,其能源构成以煤炭为主,消耗量占一次能源消费量的76%左右。随着经济的快速发展,煤耗的增加,燃煤造成的大气污染日趋严重,特别是燃煤烟气中的氮氧化物(NOx),是大气污染的主要污染物之一。据统计,我国大气污染物中NOx 60 %来自于煤的燃烧,其中火电厂发电用煤又占了全国燃煤的70%。2000 年我国火电厂氮氧化物排放量控制在500万t 左右,按照目前的排放控制水平,到2020年,氮氧化物排放量将达到1000万t 以上。NOx对大气的污染已成为一个不容忽视的重要问题,控制和治理氮氧化物污染已迫在眉睫。燃煤烟气脱氮称为烟气脱硝,脱硝是控制NOx污染的一个重要途径。近年来国内外研究开发了一系列燃煤烟气脱硝技术,并取得了一定成果。
2. 烟气脱硝技术的介绍
烟气脱硝技术按治理工艺可分为湿法脱硝和干法脱硝。湿法脱硝包括:酸吸收法、碱吸收法、氧化吸收法、络盐吸收法等;干法脱硝主要有:选择性催化还原法、非选择性催化还原法、等。此外,近十几年来国内外一些科研人员还开发了用微生物来处理含NOX废气,成为研究的热点。
2.1 湿法烟气脱硝技术
湿法烟气脱硝是利用液体吸收剂将NOx溶解的原理来净化燃煤烟气,其最大的障碍是NO很难溶于水,往往要求将NO首先氧化为NO2。为此一般先将NO通过与氧化剂O3 、ClO2或KMnO4反应,氧化生成NO2,然后NO2被水或碱性溶液吸收,实现烟气脱硝。
湿法脱硝技术优点:脱硝效率较高;因吸收剂种类较多,来源广泛,适应性强;能以硝酸盐等形式回收NOX,可达到综合利用的目的。缺点是其技术比较复杂,设备容量大不易建造,成本较高,而且易造成溶液的二次污染。
2.2 干法脱硝技术
与湿法相比,干法净化处理含NOX尾气的主要优点是:设备及工艺过程简单,脱除NOX的效率也较高,无废水和废弃物处理,不易造成二次污染。
2.2.1 选择性催化还原(SCR)脱硝
SCR脱硝原理是利用NH3和催化剂(铁、钒、铬、钴或钼等碱金属)在温度为200~450℃时将NOX还原为N2。NH3具有选择性,只与NOX发生反应,基本上不与O2反应,所以称为选择性催化还原脱硝。
SCR法是国际上应用最多,技术最成熟的一种烟气脱硝技术。在欧洲已有120多台大型的SCR装置的成功应用经验,其NOX的脱除率达到80%~90%;日本大约有170套SCR装置,接近100000MW容量的电厂安装了这种设备;美国政府也将SCR技术作为主要的电厂控制NOX技术。
该法的优点是:由于使用了催化剂,故反应温度较低;净化率高,可达85%以上;工艺设备紧凑,运行可靠;还原后的氮气放空,无二次污染。但也存在一些缺点:烟气成分复杂,某些污染物可使催化剂中毒;高分散的粉尘微粒可覆盖催化剂的表面,使其活性下降;系统中存在一些未反应的NH3和烟气中的SO2作用,生成易腐蚀和堵塞设备的(NH4)2SO4和NH4HSO4,同时还会降低氨的利用率;投资与运行费用(投资费用80美元/千瓦)较高。
2.2.2 非选择性催化还原(SNCR)脱硝
与SCR法相比,SNCR法除不用催化剂外,基本原理和化学反应基本相同。SNCR法通过在烟道气中产生的氨自由基与NOX反应,以去除NOX。因没有催化剂作用,反应所需温度较高(900~1200℃),温度控制是关键,以免氨被氧化成氮氧化物。
该法的优点是不需催化剂,投资较SCR法小(投资费用15美元/千瓦)。但氨液消耗量大,NOX的脱除率也不高。目前大部分锅炉都不采用此法,主要原因是:(1)效率不高;(2)反应剂和运载介质(空气)的消耗量大;(3)氨的泄漏量大;(4)生成的(NH4)2SO4和NH4HSO4会腐蚀和堵塞设备。
2.3 微生物法脱氮
采用微生物净化含NOX废气的净化机理是:适宜的脱氮菌在有外加碳源的情况下,利用NOX作为氮源,将NOX还原为最基本无害的氮气,而脱氮菌本身获得生长繁殖。其中NO2先溶于水中形成NO3-及NO2-,然后被微生物还原为氮气,烟气中的NO则直接被吸附在微生物表面还原为氮气。
用微生物进行废气脱硝能有效地脱除废气中的NOX,具有工艺简单、能耗和处理费用低、效率高、无二次污染等优点。但要实现工业应用还存在一些问题:(1)微生物的生长速度相对较慢,要处理大流量的烟气,还需对菌种作进一步的筛选;(2)微生物的生长需适宜的环境;(3)微生物的生长会造成塔内填料的堵塞。
3. 火电厂脱硝工程的工艺选择
通过上述主要脱硝技术介绍可以看出,SCR技术对烟气NOx的控制效果十分显著,它具有工作温度低,技术成熟可靠,易于操作,脱硝效率高等优点,是目前世界唯一大规模投入商业应用并能满足日益严峻环保要求的控制措施,非常适合应用于大中型火力发电厂脱硝工程。
4. SCR烟气脱硝工程实例
某发电厂二期工程2×660MW国产超临界燃煤汽轮发电机组机组,响应国家节能减排号召,严格执行环保排放标准,3号炉同步建设烟气脱硝装置,4号炉考虑预留烟气脱硝装置,配套脱硝工艺为浙江融智能源科技有限公司的选择性催化还原法(SCR),并由其设计、供货。
4.1工艺流程
3号炉烟气脱硝装置配置两个脱硝反应器, 一套氨储存、蒸发、供应系统,氨区设计考虑4号炉预留脱硝还原剂供应,烟气从锅炉省煤器出来后进入脱硝进口烟道,在此位置处通过氨喷射格栅喷入氨气与烟气进行混合。含有氨气的烟气进入脱硝反应器,在反应器中完成脱硝反应,经脱硝后的烟气进入空气预热器,经除尘、脱硫净化处理后排入大气。本脱硝装置不设置旁路。
脱硝还原剂氨气是由液氨储罐中液氨经液氨蒸发器加热蒸发产生纯氨气,与稀释风机提供的空气在混合气中混合稀释后,喷入脱硝烟道中。
脱硝装置采用板式催化剂,板间距为6mm,这种催化剂不易堵塞。由于脱硝装置为高尘布置,在运行过程催化剂表面会积灰,需采用声波吹灰器进行定期吹扫。每层催化剂均设置声波吹灰器,压缩空气取自锅炉。
4.2系统设计
本脱硝系统主要设计参数如表1所示。
本烟气脱硝工程设计主要分三部分:SCR本体设计部分;氨区设计部分;辅助系统设计部分。
4.2.1、SCR本体设计部分
本工程脱硝系统设计脱硝效率为80%。SCR催化剂按2+1方式布置(即初始布置二层,预留一层)。系统不设置SCR装置旁路和省煤器高温旁路。SCR装置设置检修、测试平台, SCR系统主要设备如下:
A)、SCR反应器:每台炉设置两台反应器,反应器的长、宽、高分别为:12m、12m和12.6m.
B)、吹灰系统:反应器每层催化剂设置3台声波吹灰器,吹灰介质为检修用压缩空气,压力为0.45~0.7MPa。每台吹灰器的单位时间空气耗量为6Nm3/min,吹扫频率为72次/h。
C)、灰斗:在每个SCR脱硝出口烟道处设置3个灰斗,以收集大颗粒飞灰,防止其随烟气进入空预器。
D)、催化剂:采用板式催化剂,活性温度为300~420℃,催化剂间距为6mm。催化剂基材为不锈钢材质,活性物质为TiO2、钒化合物等。催化剂化学寿命为24000h。
4.2.2氨区设计部分
脱硝还原剂采用液氨。液氨储存、制备、供应系统包括液氨卸料压缩机、液氨储罐、液氨蒸发器、氨气缓冲罐、氨气稀释槽、废水泵等。
氨区占地面积为24m×21.6m。主要设备规范见表2:
4.2.3辅助系统设计
压缩空气系统:从锅炉压缩检修用空气母管、仪用压缩空气母管接出。
蒸汽系统:蒸发液氨所需的蒸汽从锅炉蒸汽管道上接出。
4.3 脱硝系统的运行
4.3.1氨气流量控制
液氨经过蒸发器产生脱硝所需氨气(浓度为100%),在混合器中被空气稀释成5%(体积比例)浓度以下,然后喷入烟道中进行反应。为保证进入脱硝烟道氨气浓度在5%以下,稀释风量按最大氨耗量时所需空气流量设计,并在运行时保持空气流量不变。
运行过程中氨耗量需根据反应器进出口烟气中NOx浓度来调整控制。脱硝系统设有停止喷氨烟气温度、最低喷氨烟气温度、最高连续运行温度,当烟气温度低于最低喷氨温度或高于最高连续运行温度时,需停止喷氨。
4.3.2吹灰控制
吹灰系统采用声波吹灰方式,吹灰器的数量为3台/层,能将催化剂中的积灰尽可能多地吹扫干净,此种吹灰方式可避免因死角而造成催化剂失效导致脱硝效率的下降和反应器烟气阻力的增加。每一层催化剂吹灰的顺序为每层每次运行一台声波喇叭,每组每次运行十秒钟,每一循环的间隔为十分钟。吹灰频率可根据反应器的压降进行调整控制。
4.4 实际运行情况
该电厂二期2×660MW机组3号炉烟气脱硝装置投运以来,运行稳定,未发生设备故障。催化剂采用声波吹灰器吹灰效果良好,催化剂层积灰很少。氨区系统供氨连续稳定,无设备故障,未发生氨泄漏。烟气脱硝装置与锅炉主机同步于2009年3月27日下午3点顺利通过168小时试运行,于2010年4月份顺利通过性能试验,各项性能指标满足设计要求。
在性能试验期间,主要数据见表3。
5. 结束语
选择性催化还原法(SCR)烟气脱硝工艺是非常成熟、可靠的工艺,并在火力发电厂660MW机组上得到应用,该工程脱硝装置运行稳定,脱硝装置的各项性能指标均满足性能要求,SCR烟气脱硝工艺应在大型火力发电厂脱硝工程上给予推广应用。
参考文献:
[1]王振宇. 燃煤电厂的除尘、脱硫、脱销技术[J]. 环境保护科学,2005.
[2] 吴忠标. 大气污染控制技术[M]. 北京:化学工业出版社,2002.
[3]李晓东,杨卓如. 国外氮氧化物气体治理的研究进展[J]. 环境工程,1996.
吉林省辽源矿业集团总医院,吉林辽源136200
[摘要]目的探讨纳米银敷料结合重组牛碱性成纤维细胞生长因子凝胶治疗烧伤残余创面的临床效果。方法选取我院自2011年10月—2013年10月收治的76例出现烧伤残余创面患者随机分为观察组与参考组,各为38例,观察组患者采用纳米银敷料结合重组牛碱性成纤维细胞生长因子凝胶治疗,参考组患者采用无菌石蜡油纱布联合生理盐水换药,比较两组患者创面愈合时间、感染例数、治疗7d时创面细菌培养情况及药物不良反应。结果参考组患者创面愈合时间明细小于观察组(P<0.05);参考组患者出现13例感染,感染率为34.2%,观察组患者出现3例感染,感染率为7.9%,数据比较有统计学意义(P<0.05);参考组患者7d时创面细菌检出率明显高于观察组(P<0.05);两组患者药物不良反应比较无统计学意义(P>0.05)。结论采用纳米银敷料结合重组牛碱性成纤维细胞生长因子凝胶治疗烧伤残余创面,抗菌作用显著,能够促进创面修复,值得推广使用。
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关键词 ]纳米银敷料;重组牛碱性成纤维细胞生长因子凝胶;烧伤残余创面
[中图分类号]R446[文献标识码]A[文章编号]1672-5654(2014)05(c)-0160-02
近年来烧伤患者不断增加,严重威胁人们健康,烧伤后创面处理不及时彻底可导致感染、反复溃烂等,延迟创面愈合。传统临床治疗中主要采用高渗盐水及生理盐水等联合外用抗菌素药物作为换药药物,然而仍然存在较高的感染率等,纳米银敷料作为新型敷料,能够维持创面的动态活性银,可用于各类创口的治疗,重组牛碱性成纤维细胞生长因子在创面的修复中效果显著,为对二者结合治疗烧伤伤残余创面的治疗效果进行探讨,笔者对我院收治的76例出现烧伤残余创面的患者进行研究分析,报道如下。
1资料与方法
1.1一般资料
我院自2011年10月—2013年10月收治的出现76例(80处创面)烧伤残余创面患者,男43例,女33例,年龄18~55岁,平均年龄(30.25±4.18)年,创面大小(4.32±0.53)cm2,其中深Ⅱ度44处,Ⅲ度36处,距离治疗时间>21d,热液烫伤39例,火焰烧伤37例,残余创面位置:四肢45处,躯体35处,排除出血倾向或出血性疾病、严重心肺肝肾障碍、血液系统疾病及严重感染、并发症、病情危重患者,排除糖尿病等代谢性疾病患者,所有患者均无银过敏史,将患者随机分为参考组与观察组,各为38例,两组患者年龄、病情及性别等比较无统计学意义(P>0.05),可进行比较。
1.2方法
使用材料:纳米银敷料(生产公司:深圳市爱杰特医药科技有有限公司,生产许可:20030851),重组牛碱性成纤维细胞生长因子凝胶(生产公司:珠海亿胜生物制药有限公司。国药准字:S20040001)。观察组:彻底对创面消毒清理后,采用生理盐水对创面进行清洁,之后在创面涂抹重组牛碱性成纤维细胞生长因子凝胶,每次300IU/cm2,之后敷贴纳米银敷料;参考组:采用生理盐水对创面彻底清理后,采用无菌石蜡油纱布对创面进行包扎,两组患者均每天换药1次。
1.3观察指标
对两组患者创面愈合时间进行观察,同时记录创面出现的疼痛加重、红肿、创面脓性分泌物等,在治疗7d时分别对两组患者创面细菌进行培养,同时记录患者药物不良反应发生情况。
1.4统计学分析
本次研究均采用spss18.0统计学软件处理所有患者的临床资料,采用均数加减标准差表示(x±s)计量资料,采用t检验计数资料,采用χ2检验组间对比,P<0.05为差异具有统计学意义。
2结果
①参考组患者创面平均愈合时间为(28.34±6.13)d,观察组患者创面平均愈合时间为(19.68±5.28)d,数据比较有统计学意义(P<0.05)。
②参考组13例患者康复期间出现创面感染,感染发生率为34.2%,观察组3例患者康复期间出现创面感染,感染发生率为7.9%,差异有统计学意义(P<0.05);治疗7d时,参考组患者致病细菌检出率明显高于观察组,差异有统计学意义(P<0.05),详见表1。
③观察组患者在治疗期间未出现局部或全身过敏症状,无创面疼痛,患者肝肾、血常规检查等均正常,参考组患者治疗期间未出现任何不良反应,数据比较无统计学意义(P>0.05)。
3讨论
纳米银敷料具有杀菌、抗菌效果,阴离子释放后,结合带负电荷的菌体蛋白质,并使其变形沉淀银同时与酶的巯基结合,从而形成稳定的硫酸盐[1],抑制系列巯基的酶活性,将细菌呼吸酶系统阻断,对细菌代谢进行干扰,并最终导致细菌死亡,从而起到有效的抑菌及杀菌。银的杀菌机制与化学合成的抗菌剂不同,通过重金属离子对细菌蛋白质的变性产生作用,从而具有不易耐药、广谱杀菌的作用[2]。纳米银敷料化学特性稳定,能够与真菌及细菌的DNA结合,并促使其结构的改变,使真菌及细菌活性受到抑制[3]。重组牛碱性成纤维细胞生长因子作为生物活性较强的促分裂元,能够刺激成纤维细胞、上皮细胞、血管内皮细胞、真皮细胞等具有再生及促修复作用[4]。药物能够促进内皮细胞分裂,诱导其分泌某些蛋白酶,溶解并侵入周围基质,形成纤维细胞及毛细血管,建立侧支循环,促进新的毛细血管网的形成,血液流量、肉芽组织毛细血管数量等均明显增加,创面微循环有效改善[5]。重组牛碱性成纤维细胞生长因子等在创伤、烧伤及慢性溃疡的治疗中能够有效促进伤口愈合,能够促进供皮区、烧创伤、手术创面的良好愈合[6]。本次研究中,观察组患者创面平均愈合时间明显短于参考组(P<0.05),患者治疗中感染发生率明显低于参考组(P<0.05),治疗7d后观察组患者细菌检出率明显低于参考组(P<0.05),由此可见,纳米银敷料结合重组牛碱性成纤维细胞生长因子凝胶治疗烧伤残余创面;本次治疗中,两组患者均未出现不良反应,比较无统计学意义(P>0.05),由此可知,纳米银敷料及重组牛碱性成纤维细胞生长因子凝胶在创面治疗中均不会产生严重不良反应,安全性高,值得推广使用。
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参考文献]
[1]李民,牛亚明,林倩君,等.纳米银敷料对烧伤创面保护作用的观察[J].中国医师进修杂志,2006,29(5):11-13.
[2]李晓鲁,黄跃生,彭毅志,等.纳米晶体银敷料治疗烧伤后残余创面的多中心临床研究[J].中华烧伤杂志,2006,22(1):15-18.
[3]郭立君,李校堃,许华,等.重组牛碱性成纤维细胞生长因子治疗Ⅱ度烧伤的临床疗效[J].中国生物制品学杂志,2002,12(5):63-64.
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[5]刘族安,夏照帆,唐洪泰,等.重组牛碱性成纤维细胞生长因子凝胶对烧伤创面的疗效研究[J].第二军医大学学报,2004,12(11):36-37.
想要成为一位合格的小导游,一份精彩、生动的导游词必不可少。导游词中,既要有对景区的整体介绍,也要有对某个景点的重点讲解,如果还能对景点名称的由来侃侃而谈,并且巧妙地穿插景观背后的历史和故事,引用名人留下的诗句或对联,就更能激发游客的兴趣了。快跟上我的脚步,打造一份独特的导游词,让更多的游客进一步领略世界文化遗产的艺术魅力,留下美好的回忆吧!
当我们与游客初次见面时,首先应向游客问好,然后进行自我介绍,再说欢迎词,最后告知将会带大家去哪一处景点,说明游览的目的,最重要的是别忘了带上你的热情与礼貌哟!请注意,本次列车即将到达旅程的第一站――八达岭长城。
“各位游客大家好,欢迎大家搭乘我们的游览专列,我是你们的导游。首先,我要祝贺大家即将成为真正的‘好汉’!因为我们今天将登上八达岭长城,真正感受‘不到长城非好汉’的意境。”
在游客们准备下车,开始今天的游览行程之前,小导游不妨先总体介绍这处景点的基本情况,比如它的地理位置在哪儿,它在全国甚至全世界有什么地位,等等。
“现在,我们的列车马上就要进入八达岭景区了。大家看,前面的那座就是军都山,长城就像一条巨龙盘踞在这座山上。长城是中华文化的瑰宝,是世界文化遗产之一,被誉为世界建筑的奇迹!它东起山海关,西至嘉峪关,是中国古代人民智慧血汗的结晶,也是中国古代文化的象征和中华民族的骄傲。我们今天要参观的八达岭长城是明代修筑的,它气势磅礴,正是万里长城的精华。”
当游客步入景区时,导游的核心任务就是向他们展示这一景区的最大魅力与特色,并重点介绍几处著名的风光或景观。简单来说,我们可以按照游览顺序,对所选景观逐一进行生动的、具体的描述和解说,使游客尽情览景点风光。
“朋友们,我们现在已经来到了长城脚下,请大家先朝远处看。长城像不像一条在崇山峻岭上伏卧的巨龙?它时隐时现,正准备腾空翱翔呢!长城高大坚固,它是由巨大的条石和城砖筑成的,是我国古代重要的军事防御工程。
让我们登上长城看看吧。这里的城砖十分平坦,道路十分宽阔,要是在古代,五六匹马可以并排行走。请大家再走近些看看,这里的城墙外沿还有两米多高的成排的垛子,大家能猜到垛子上方形的口子有什么功用吗?大家猜对了!这些方形的口子又称为t望口或射口,供古时戍守的将士们t望侦察和射击防御。我们再稍稍抬头,可以看到城墙顶上每隔三百多米就有一座方形的城台,那是屯兵的堡垒。打仗的时候,城台之间还可以相互呼应呢。”
成功的导游词不需要“眉毛胡子一把抓”,但要使内容更丰富、语言更生动,快向我学习这几个小妙招:首先,恰当地使用比喻、拟人、夸张、象征等手法,使静止的景观化为生动鲜活的画面,让游客沉浸和陶醉其中;其次,运用列数字的方法描述景观的特点,让游客真正游有所得、有所收获;再次,可以不失时机地穿插趣味盎然的神话传说、民间故事、诗文典故,引发游客的好奇心理,给他们留下深刻的印象。
“八达岭长城的墙体平均高7.8米,墙底宽6.5米至7.5米,顶宽4.5米。往下看是由两个门洞和U字形墙组成的瓮城。由于长城是一个完整的军事防御体系,因此它不仅有瓮城和城墙,还有传报军情的烽火台。
大家知道吗?长城是有感情的呢。关于长城有一个传说,相传秦始皇时劳役繁重,青年男女范杞梁、孟姜女新婚不到三天,新郎就被抓去修长城了。孟姜女在家等了很久也不见丈夫归来,就万里寻夫来到长城脚下。不料丈夫已经变成一堆白骨,孟姜女悲恸不已,在此大哭了三天三夜,哭倒了长城,自己也变成了一块望夫石。”
当我们旅游专列第一站的游览接近尾声时,小导游们可千万别忘了有礼貌地向游客道别,顺便也给今天的游览行程做一个小结。
一下车,就看到了一块大石碑,上面写着“八达岭长城”五个亮晶晶的大字。再往前看,一条长龙卧在那蜿蜒的山峰上,一眼望不到边。早在车上,导游就介绍过了,八达岭长城史称天下九塞之一,是万里长城的精华,在明长城中独具代表性。既然是九塞之一,当然是十分陡峭。所以年老体弱的可以先坐滑车到第四个烽火台,再登三个烽火台到山顶,如果要当好汉的那就要从山脚第一个烽火台一直往上登到第七个烽火台到山顶。听了导游的介绍后,我就跃跃欲试,当然我是要做好汉的了。
我刚站在八达岭城的入城口,我的腿就不禁抖起来,那看起来耸入云霄的烽火台与笔挺的台阶着实让我不寒而栗。我心里不禁有点后悔了,那么陡,怎么爬得上去啊!做滑车多省心啊!可是这世界上是没有后悔药的。既然已经来到了长城脚底下了,那就登上山顶征服长城吧!也不枉我来此一趟了。我战胜了心中的胆怯大步往上攀登。
刚开始台阶虽有些陡,但还能爬得上去,可过来一会儿,就越来越陡了,只好借助于长城两端建好的栏杆,扶着那长长地栏杆一步一步往上爬,慢慢地我终于登上了第一个烽火台,脚就像罐了铅一样,很酸!我站在烽火台上极目远眺心旷神怡,山下都是郁郁葱葱的树林,风迎面吹来,把我一身汗水吹得无影无踪。我的力气又回来了,继续吧!爬过一道道斜坡和高高的台阶,爬一会儿休息一会儿,不管认识的,还是不认识的,老的少的,经过身边的时候都不忘相互提醒喊声“加油”。经过漫长的上下斜坡路和近乎垂直地台阶。我和妈妈都没了力气,那长长的台阶似乎得意地在对我说:“哈哈,没力气了吧,登不上去了吧,就别当好汉了,回去吧!”我的心中似乎一下子又充满了力量,用手甩去额头的汗珠,手攀着那漫长而又结实的栏杆,脚踏着坚定的步伐,心中充满了登上长城的信念。
那天天气非常好,一大早我们就坐车去八达岭长城了。大概过了一个小时,透过车窗,我看见远处出现了连绵不断的高山,山峰上隐隐约约出现了白色的城墙,城墙在红彤彤的朝霞的映衬下,犹如一条歪歪扭扭的金丝带,爸爸告诉我那就是闻名中外的长城。旅游车离长城越来越近,我的心也越来越激动,感觉时间过得真慢!几分钟后,我们的车就来到了离长城脚下不远处的车站,我迫不及待地下了车。
首先映入我眼帘的是镌刻在路边巨石上的名言:不到长城非好汉。我们在巨石前拍照留影,爸爸兴奋地对我说:“我们今天一定要做回好汉!”买好门票,我们就进入景区了。我站在长城的入口处,向远方眺望,只见长城蜿蜒曲折、连绵不断,远处的游人似一个个小点,缓缓地上下移动。我们一边登长城,爸爸一边向我介绍长城的知识。爸爸告诉我,八达岭长城是1505年的明朝开始兴建的,主要是为了抵御外敌的入侵,城墙两边锯齿形的叫垛口,上面有?望口,下面有射击口,高高的像楼房似的建筑叫烽火台,当士兵发现有敌人入侵时,就点燃烽火台上预先准备好的柴火,远处的士兵看见烽火台上冒出的黑烟,便知道有敌情,会迅速赶来增援。听了爸爸的介绍,我想:我国古代的人民真聪明啊!
不知不觉中,我们就登上了一个烽火台,我向北面望去,只见城墙脚下山石起伏,我的眼前仿佛浮现了当年战争的残酷场面:千军万马滚滚而来,城墙上战鼓喧天,入侵的敌人有的手提大刀,有的手持长枪,还有的肩扛炸药……长城上的士兵奋勇抵抗,到处是厮杀声,到处是呐喊声,到处是鲜血和尸体……我再看长城的南面,一块巨大的广告牌展现在我的眼前,上面用中英文写着:同一个世界,同一个梦想。我想这既是2008年北京奥运会的宣传语,也是我们今天生活的真实写照,我们生活在和平年代,要更加珍惜来之不易的美好生活!
由于这天北风很大,我们走得很慢,有时是走两步退一步,所以我们不得不拉着扶手缓慢挪动身体,其他的游客也是走走停停,显得非常吃力,但是大家都没有停下来的意思,因为我们的共同目标都是长城的最高处--海拔888米的“好汉坡”。
长城距今有2000多年的历史,总长50000多公里,是人类历史上占地面积最大的建筑。长城非常雄伟。它西起嘉峪关,东到三海关,全长有6700多公里,通称“万里长城”。城墙平均高7、8米,顶宽7、8米,可以5马并骑。万里长城全部都用大条石和城砖砌成的。如果把大条石和城砖连起来,就能绕地球一圈多。万里长城不但雄伟,而且美观。雄伟的巨龙穿行在丛林之中,城墙上面分布着成千上万座高大的烽火台,显得雄奇险峻充满巨大的艺术魅力。万里长城表现了劳动人民的智慧和才干,是我国宝贵的历史遗产。
名师点评:小作者给我们介绍了万里长城的有关知识,通过阅读小作者的文章,我们了解到了长城的历史、外貌及其在历史上的地位。文章语言描写生动形象,表达了小作者对长城的赞美之情。“东到三海关”改为“东到山海关”。
五年级:女孩载童年