第一篇:国际学术会议交流方案
Study on the Prediction Model of Bus Arrival Time
The Urban Public Transportation Information Service System, for the bus arrival time showed on the intelligent electronic station board,is designed to provide accurate and timely information which can help travelers choose transit lines and the shortest paths, can improve the travel efficiency and attract more potential travelers.However, the current bus arrival time prediction model under application can’t achieve satisfactory results.This paper analyzes the technology components of the bus arrival time, and builds real-time dynamic models for each component.Finally, it adds up all the technology components of the bus arrival time, gets a much more accurate prediction model.Keywords—electronic station board;bus arrival time;prediction model
(一)INTRODUCTION1、Nowadays, urban public transportation system has attracted the people’s unprecedented attention and experienced a very good development;meanwhile, theory research,system design and implementation of the Advanced Public Transportation Systems(APTS), as an important part of the Intelligent Transportation Systems(ITS),are being promoted.2、Installing the intelligent electronic station board at the bus stop station for showing the distribution of transit lines related to the station, the distance of the bus belong to some transit line and their prediction arrival time, can help passengers know the location of each bus and determine their travel arrangements.3、The Urban Public Transportation Information Service System is an important part of APTS, also reflects the modernization of urban public transportation;it constitutes a part of the modern urban public transportation system, collaborating with the intelligent transit dispatching system, the transit optimization system and the transit evaluation system.(二)TECHNICAL ANALYSIS OF BUS ARRIVAL TIME1、The accuracy of the bus arrival prediction time is directly related to the precision of information showed on the intelligent electronic station board.Therefore, the accuracy of the next bus’s arrival prediction time showed on the intelligent electronic station board is a very key indicator.2、The prediction model of bus arrival time displayed on the intelligent electronic station board need to be improved urgently.meanwhile, theory research,system design and implementation of the Advanced Public Transportation Systems(APTS), as an important part of the Intelligent Transportation Systems(ITS),are being promoted.3、The technology components of the bus arrival time are divided into the following five parts:
The average travel time through the sections;Queuing delay time as a result of the impact of signal control;The time the bus travel through the intersection;Stop time at the last few stop stations as a result of the passengers get off and on before the prediction
stop station;
Lost time of slow down and speed up because of bus entering and leaving the stop at the last
few stop stations before the prediction stop station.(三)THE PREDICTION MODEL OF BUS ARRIVAL TIME
A.The travel time on sections
Travel time is defined as pure running time on sections, does not contain short delayed time because of traffic signal control, the time for passengers getting on and off on each stop station and the stop time for vehicle technical problems.B.The delay time on stop stations before the prediction stop station
The delay time at stop station denotes the lost time when they slow down and speed up because of bus entering and leaving the stop station, the time for opening(closing)the bus doors and the time occupied by passengers to get on(off).C.Queuing delay time as a result of the impact of signal control
D.The time the bus travel through the intersection
It is presumed that the speed of vehicles travel through kth intersection equals to the average vehicle speed of upstream section and downstream section, then the time the bus travel through the kth intersection equals E.Calculating the bus arrival time
(四)CONCLUSION
The average travel time through the sections;Queuing delay time as a result of the impact of signal control;The time the bus travel through the intersection;Stop time at the last few stop stations as a result of the passengers get off and on before the prediction
stop station;
Lost time of slow down and speed up because of bus entering and leaving the stop at the last
few stop stations before the prediction stop station. Finally, I find my explanation about my major is too professional for my classmates to understand, so I
find it is important to make use of examples if I want to make my audience clear.This major's main job is making and optimizing machines.Students of this major will learn the theory of machines and build the machine based on the knowledge.In addition, analyzation optimization of the machine is also required in this major, which will make the machine works well.This major deals with the whole plan of the project including investment regulation, risk control, quality and quantity.All of the work makes the plan goes well and get rich profit.
第二篇:硒—国际学术会议
以单一元素作为议题而举行的国际研讨会,硒是最早的,也是唯一的一个,每五年举办一次,至今已召开八届。其中,第三届和第六届都在中国北京举办;2006年,第八届“硒在生物医药中的应用”国际会议在美国威斯康星大学隆重召开,纳米硒是本届硒全球大会来自中国的唯一参展商。由此可见硒对人体健康的重要性。
硒在人体中的作用是广谱的。迄今为止,已知人类有490余种疾病与缺硒有直接关系。人们把硒称为“明星营养素”、“抗癌之王”等等,国际上发表的硒的生物医学研究科学论文已经超过一万篇,是其他微量元素所不能比拟的。
第三篇:国际学术会议邀请函
国际学术会议邀请函范文
国际学术会议邀请函范文(一)
尊敬的xxx先生/女士:
为进一步满足第二语言教学对汉语句式研究的迫切需要,促进语法研究新成果向国际汉语教学应用的转化,北京语言大学汉语学院拟 于 20xx 年 x 月 xx 日在北京语言大学举办汉语国际教育语境下的句式研究与教学专题研讨会。鉴于您在第二语言研究领域的丰厚学术成果,诚邀您出席并发表鸿文,嘉惠学林。
有关会议安排如下:
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二.会议地点:北京xx大学
三.会议主旨:促进前沿语言学理论的创新及其向国际汉语教学的转化与应用;推动语言学理论的本土化研究
四.会议议题:
1)类型学视角下的汉语句式研究;
2)汉语句式研究的跨文化视角与相关语言事实;
3)跨文化视角下的汉语第二语言句式教学;
4)汉语教材、大纲、教学设计中的句式问题;
5)汉语作为第二语言句式教学中的相关问题
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国际学术会议邀请函范文(二)
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在当今世界文化呈现出多元分化的大趋势下,研究文学经典是树立和坚守基本道德伦理和价值规范的途径。文学经典作为历史长河中形成的各民族核心文化和情感纽带的体现,它所承载的鲜明民族个性不会被时间淹没,起着非常重要的文化传承作用。外国文学研究者要始终保持选择、确立和传播经典作品的自觉意识,积极面对文学经典在跨文化的旅行中发育演变这一现实,着力推进跨文化视界中的文学经典研究。
为了更好地研究经过时间筛选而沉淀下来的文学经典,从构成各民族文化土壤的经典中汲取精神养分,团结学界同仁,加强中外学者在该领域的交
流与合作,做出更大成绩,经中国教育部有关部门批准,XX大学世界文学与比较文学研究所、XX省比较文学与外国文学学会、XX省作家协会外国文学委员会拟定于20XX年11月5日-7日在杭州召开世界文学经典与跨文化沟通国际学术研讨会。
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第四篇:国际学术会议论文
Description of the Antibiotics ShaoZengHua from Class Biology engineer 091 Abstract: Antibiotics is a kind of secondary metabolite that was produced by Microorganism or advanced flora and fauna is antiviral or have other activity.It can disturb other cell’s growth.Antibiotics plays an important role in the people medical treatment development.But using antibiotics for a long period of time lead to the bacteria come into being drug resistant.So we need to know the harm of misusing the antibiotics besides we should use the antibiotics reasonably.Key words: antibiotics, mechanism, the phenomenon of misusage, using with reason.Main body: The typical example of antibiotics is penicillin.The penicillin discovery and the depuration are one of the greatest discoveries in the human history.There have been about ten thousand antibiotics since penicillin apply to clinic use.There are about 200 kind of antibiotics applies in clinical.The antibiotic widespread application saved the innumerable lives;the antibiotic is still at this point doctor treats in the course of infection the essential drugs.Antibiotics not only could destroys bacteria but also could decreased and destroyed the molds, mycoplasma and other that can make person fall ill.Antibiotics have four mechanisms against the hurtfully Microbe.1.Impeding the bacteria composite the cell wall, result in the bacteria blasting to death.2.Interaction with the bacterium cell membrane, the enhancement bacterium cell membrane's permeability, open on the membrane the ion channel, let the bacterium interior the useful material leak off the mycelium or electrolyte balanced being out of balance dies.3.Use with the bacterium ribosome or its response substrate, to suppress the protein mutually synthesis it is mean that the cell survival must the structure protein and the enzyme cannot synthesize.4.Impeding the DNA’s copy and transcription of the bacterium.Even though there are so many advantages of antibiotics there come out a phenomenon that as soon as we fall ill we will take many antibiotics.Than the bacteria have the drug tolerance.The super bacteria’s appear just was owing to the antibiotics’ misusing.The other way, the antibiotics also have the adverse reaction.If we always misusing the antibiotics maybe have an exactly opposite effect.So we must use the antibiotics reasonable.1.If we can use lower level antibiotics than we do not use the higher level 2.We should strictly according to what the doctor had said.Taking the antibiotics in accordance with what the doctor had said.3.Do not taking the antibiotics voluntary.4.Gives off heat reason unclear not to be suitable uses the antibiotic except the condition to be seriously injured, and suspected highly for the bacterium infected person outside, gives off heat reason unclear not to be suitable uses the antibiotic In a word, antibiotic is a double-edged sword.If we use it with reason there will be fewer pains.But misusing the antibiotic and if it continue in this way, we will come back to the situation that we do not have any antibiotics to use in 40 years ago.So in my opinion using antibiotics reasonable is extremely.1.能用窄谱抗生素就不用广谱的, 能用低级的就不用高级的。2.3.服用抗生素要严格按照医嘱、按规定间隔定时服药。如每日4 次, 即每6 小时服1 次;每日3 次, 即每8 小时服1 次, 而不是指在每日三顿饭时服用。4.按处方规定用药, 切忌随意使用。随意反复使用抗生素, 不但不能杀灭体内致病菌,而且容易使残留的致病菌产生耐药性。
5.因细菌性感染导致发热的, 在经抗生素治疗体温正常后, 要及时停用抗生素。
6.最好不要因预防而使用抗生素, 特别是广谱抗生素。
7.病毒性感染一般不使用抗生素, 如果发热原因不明, 且无可疑细菌感染征 象者, 不宜使用抗生素。
阻碍细菌细胞壁的合成,导致细菌在低渗透压环境下膨胀破裂死亡,以这种方式作用的抗生素主要是β-内酰胺类抗生素。哺乳动物的细胞没有细胞壁,不受这类药物的影响。
与细菌细胞膜相互作用,增强细菌细胞膜的通透性、打开膜上的离子通道,让细菌内部的有用物质漏出菌体或电解质平衡失调而死。以这种方式作用的抗生素有多粘菌素和短杆菌肽等。
与细菌核糖体或其反应底物(如tRNA、mRNA)相互所用,抑制蛋白质的合成——这意味着细胞存活所必需的结构蛋白和酶不能被合成。以这种方式作用的抗生素包括四环素类抗生素、大环内酯类抗生素、氨基糖苷类抗生素、氯霉素等。
阻碍细菌DNA的复制和转录,阻碍DNA复制将导致细菌细胞分裂繁殖受阻,阻碍DNA转录成mRNA则导致后续的mRNA翻译合成蛋白的过程受阻。以这种方式作用的主要是人工合成的抗菌剂喹诺酮类(如氧氟沙星)。
抗生素不仅能杀灭细菌而且对霉菌、支原体、衣原体等其它致病微生物也有良好的抑制和杀灭作用.青霉素的发现和提纯是人类历史上最伟大的发现之一。自1941年青霉素应用于临床后,人们相继发现了上万种抗生素,有200余种抗生素应用于临床。抗生素的广泛应用已挽救了无数生命,时至今日抗生素仍然是医生治疗感染过程中不可缺少的药品。
抗生素是一类由微生物(包括细菌、真菌、放线菌属)或高等动植物在生活过程中所产生的具有抗病原体或其它活性的一类次级代谢产物,能干扰其他生活细胞发育功能的化学物质。在人类医疗发展中起了重要作用。但是长期使用抗生素是的细菌长生了耐药性。所以要了解滥用抗生素的危害并且合理使用抗生素。
抗生素(antibiotics)是。现临床常用的抗生素有微生物培养液液中提取物以及用化学方法合成或半合成的化合物。目前已知天然抗生素不下万种。
病菌耐药性增强。一些抗生素的有效率, 已经从20 年前的90%跌到现在的20%以下。除产生
耐药性外, 滥用抗生素产生的过敏和毒性反应, 还将诱发体内菌群失调和继发感染, 对人的听力、肝、肾产生危害。
1.能用窄谱抗生素就不用广谱的, 能用低级的就不用高级的。
2.用口服剂能解决的就不要打针, 肌肉注射能解决的就不要静脉滴注。
3.服用抗生素要严格按照医嘱、按规定间隔定时服药。如每日4 次, 即每6 小时服1 次;每日3 次, 即每8 小时服1 次, 而不是指在每日三顿饭时服用。4.按处方规定用药, 切忌随意使用。随意反复使用抗生素, 不但不能杀灭体内致病菌,而且容易使残留的致病菌产生耐药性。
5.因细菌性感染导致发热的, 在经抗生素治疗体温正常后, 要及时停用抗生素。
6.最好不要因预防而使用抗生素, 特别是广谱抗生素。
7.病毒性感染一般不使用抗生素, 如果发热原因不明, 且无可疑细菌感染征 象者, 不宜使用抗生素。我国滥用抗生素药物现象严重
据新华社信息,世界卫生组织的一份调查报告显示,我国住院患者抗生素药物使用率高达80 % ,其中使用广谱抗生素和联合使用两种以上抗生素的占58 % ,远远高于30 %的国际水平。在我国,滥用抗生素现象还具有明显的地区特征,在一些经济发达地区存在抗生素应用档次过高、疗程过长或不必要用药等过度用药现象;而在经济不发达地区,则出现剂量不足、疗程过短或使用假冒伪劣药品等用药不足的现象,使致病微生物没能彻底杀来而产生耐药性。这两种情况均导致耐药生物的大量出现。
抗生素等抗菌剂的抑菌或杀菌作用,主要是针对“细菌有而人(或其它高等动植物)没有”的机制进行杀伤,有4大类作用机理:
使用原则
临床应用抗生素时必须考虑以下几个基本原则:
(一)严格掌握适应证凡属可用可不用的尽量不用;而且除考虑抗生素的抗菌作用的针对性外,还必须掌握药物的不良反应和体内过程与疗效的关系。
(二)发热原因不明者不宜采用抗生素除病情危重且高度怀疑为细菌感染者外,发热原因不明者不宜用抗生素,因抗生素用后常使致病微生物不易检出,且使临床表现不典型,影响临床确诊,延误治疗。
(三)病毒性或估计为病毒性感染的疾病不用抗生素。抗生素对各种病毒性感染并无疗效,对麻疹、腮腺炎、伤风、流感等患者给予抗生素治疗是无害无益的。咽峡炎、上呼吸道感染者90%以上由病毒所引起,因此除能肯定为细菌感染者外,一般不采用抗生素。
(四)皮肤、粘膜局部尽量避免反应应用抗生素因用后易发生过敏反应且易导致耐药菌的产生。因此,除主要供局部用的抗生素如新霉素、杆菌肽外,其它抗生素特别是青霉素G的局部应用尽量避免。在眼粘膜及皮肤烧伤时应用抗生素要选择告辞适合的时期和合适的剂量。
(五)严格控制预防用抗生素的范围在下列情况下可采用预防治疗:
1.风湿热病人,定期采用青霉素G,以消灭咽部溶血链球菌,防止风湿热复发。
2.风湿性或先天性心脏病进行手术前后用青霉素G或其它适当的抗生素,以防止亚急性细菌性心内膜炎的发生。
3.感染灶切除时,依治病菌的敏感性而选用适当的抗生素。
4.战伤或复合外伤后,采用青霉素G或四环素族以防止气性坏疽。
5.结肠手术前采用卡那霉素,新霉素等作肠道准备。
6.严重烧伤后,在植皮前应用青霉素G消灭创面的溶血性链球菌感染。或按创面细菌和药敏结果采用适当的抗生素防止败血症的发生。
7.慢性支气管炎及支气扩张症患者,可在冬季预防性应用抗生素(限于门诊)。
8.颅脑术前1天应用抗生素;可预防感染。
(六)强调综合治疗的重要性在应用抗生素治疗感染性疾病的过程中,应充分认识到人体防御机制的重要性,不能过分依赖抗生素的功效而忽视了人体内在的因素,当人体免疫球蛋白的质量和数量不足、细胞免疫功能低下,或吞噬细胞性能与质量不足时,抗生素治疗则难以秦效。因此,在应用抗生素的同进应尽最大努力使病人全身状况得到改善;采取各种综合措施,以提高机体低抗能力,如降低病人过高的体温;注意饮食和休息;纠正水、电解质和碱平衡失调;改善微循环;补充血容量;以及处理原发性疾病和局部病灶等。
通俗地讲,抗生素就是用于治疗各种细菌感染或抑制致病微生物感染的药物。抗生素可以是某些微生物生长繁殖过程中产生的一种物质,用于治病的抗生素除由此直接提取外;还有完全用人工合成或部分人工合成的。
重复使用一种抗生素可能会使致病菌产生抗药性。之所以现在提出杜绝滥用抗生素此乃是原因之一。科学地使用抗生素是有的放矢。通常建议做细菌培养并作药敏试验,根据药敏试验的结果选用极度敏感药物,这样就避免了盲目性,而且也能收到良好的治疗效果。
第五篇:丽江国际学术会议
Ladies and gentlemen, we are about to close a meeting which I hope have fully lived up to the expectations of us all.I would like to thank you for your presence here in HIT for your work, your patience, and your help, without which it would not have been possible for this conference to achieve the success that we all recognize.Please allow me to give you some information about our next conference.The Symposium on the Ecosystem China-Australian Floodplain Wetland will be held in Lijiang during Mar.24th-28th, 2015.We invited Giri Kattel, a physicist and philosopher of science from German and Xuhui Dong, a Nobel Prize winner and famous industrialist from Sweden as the conference’s chairmen.The conference will focus on four aspects of wetland ecosystem including features of its long-term evolution, current status and conservation, service function, relevant management and policies.Then let’s talk about the conference place.The old town of Lijiang is a tourist attraction which is located in Yunnan Province and famous for its splendid culture, delicious food, marvelous architecture, breath-taking river, etc.It is an outstanding place to relax ourselves and re-understand traditional China.Now, please enjoy a promotional video of Lijiang.If you are interested in it, please do not hesitate to contact us via telephone, e-mail or visiting our website.