国际会议演讲稿

作者：cong | 发布时间：2020-10-01 07:05:12 收藏本文下载本文

第1篇：国际会议演讲稿

Freeze–thaw cycle test and damage mechanics models of

alkali-activated slag concrete＇＇＇＇

Thank you for your invitation and warm hospitality.“Freeze–thaw cycle test and damage mechanics models of alkali-activated slag concrete” I would like to thank Profeor Cui ,for inviting me to deliver this“Freeze-thaw cycle test and damage mechanics models of alkali-activated slag concrete”.Theplentiful studies on a new green binding material—alkali-activated concrete.The effect of freeze-thaw cycles on in concrete was studied by experiment.，I shall explore a poible agenda for analysis to enable understanding of the alkali-activated slag concrete.“new green binding material—alkali-activated cement”the introduction of Freeze–thaw cycle test and damage mechanics models of alkali-activated slag concrete.Now let's look at the ppt In recent years, there are plentiful studies on a new green binding material—alkali-activated cement, it can be prepared by wastes containing kaolinite(原文introduction第一句)The binding materials with three-dimensional network structure are yield by shrinking and polymerization reaction.With the arriving of low carbon economy time, international governments attach more importance to energy saving, emiion reducing and cycled economics.(原文第二段)a genuine low carbon cement.（ppt第3页）–I'd like to talk is the materialswe can see clear that the Slag used in this study was metallurgy blast furnace slag, was supplied by Jiangxi Building Materials Plant, PR China, its specific surface is 410 m2/kg.chemical compositions of slag are listed in.（ppt第4页）

NaOH and Na2SiO3 sodium silicate multiplex solution was used as alkali activator, module of sodium silicate is 3.34.Sand with finene modulus of 2.78 was used as fine aggregate.Limestone were used as crushed rock aggregate(5–20 mm:20–40 mm = 45:55).(引用原文Materials第二段结论)Mix proportion and specimen preparation ,.Mix proportion and specimen preparation.Mix proportion, workability and compreive strength at 28 d of ASC are listed in.It was prepared by a single decubital axis compellent beater with content of 60 L.the samples were demoulded and cured

under scheduled regimes.Thirty samples were tested for freeze–thaw cycle tests.Table 1.Mix proportion, workability and strength of ASC(引用原文第二部分第二小点)（ppt第5页）The Freeze–thaw resistance was tested according to ASTM C666 and GB/T 50082-2009 “Standard for test methods of long-term performance and durability of ordinary concrete”.Six samples of each batch were tested, the average value of 6 samples was served as the finial freeze–thaw resistance.Ma and dynamic elasticity modulus were tested once after an interval of 25 times cycles, maximal cycle times(when relative dynamic elasticity modulus was 60% and percentage of ma lo was 5% at lowest)can denote freeze–thaw resistance of ASC.TDR-16V computer controlled concrete fast freeze–thaw cycle testing machine and DT-10W dynamic elasticity modulus testing machine were used to conduct the tests.(原文2.3 /ppt第6页)

–thaw resistance mechanism of ASC 2.Freeze–thaw resistance durability of ASC(ppt 第7页)

Results of fast freeze–thaw cycle tests of ASC are listed in Table 3.As can be seen:(1)With the increase of freeze–thaw cycle times, relative dynamic elasticity modulus of ASC are descending slowly, this shows excellent ductility, relative dynamic elasticity modulus of A1–A5 are all about 90% at 300 times cycle（ppt第8页）(2)It is improper to set ma lo of ASC as the evaluation index of freeze–thaw destroy, because ma lo of A1–A5 vary indistinctively in the progre of freeze–thaw, it cannot reflect the destroy degree of concrete exactly, thus it is improper to use it to test and evaluate the freeze–thaw damage of ASC(which is shown in Fig.1).（ppt第9页）

The first is ASC used industrial waste – slag as raw materials, and it had excellent freeze–thaw resistance with frost-resisting grade of F300 at lowest, relative dynamic elasticity modulus were about 90% after 300 times freeze–thaw cycles, it also had little ma lo, surface freeze–thaw damage layers were very thin, which can effectively restrain freeze–thaw damage of concrete from worsening.(ppt第10页)The second is Different from freeze–thaw cycle damage models of PC, dynamic elasticity modulus attenuation models were superior to accumulative freeze–thaw damage models, and power function models were superior to exponential function models with better precision and relativity.（ppt第10页）

Thank you very much for the privilege of presenting this paper

第2篇：英文国际会议演讲稿

英文国际会议演讲稿范文

英文会议演讲稿篇1：英文国际学术会议开幕词演讲稿

Distinguished guests, distinguished delegates, ladies and gentlemen, and all the friends:

At this special time of wonderful August, With a pleasant subtropical climate in Xiamen, Our respectable guests are here getting together , undertaken by XMU , the 2014 10th International Conference on Natural Computation and the 2014 11th International Conference on Fuzzy Systems and Knowledge Discovery , will be open.Now, First of all, please allow me to give our hearty welcome to all of

you present, and thank you , for your friendly coming.We feel so proud, and appreciated as well to be the host of the event.It is a great honor for us to have all you here to attend this conference, of which the theme is the academic exchange about the advanced technologies on Computer Science.Here I’d be delighted to introduce our conventioneers in brief.Apart from our faculty and students, Most of the delegates and guests are prestigious experts and scientists, who are related in these fields from all over the world.With many significant achievements, they are the most dynamic leaders in the movements of the science and technology.ICNC-FSKD is a premier international forum for scientists and researchers to present the state of the art of data mining and intelligent methods inspired from nature, particularly biological, linguistic, and physical systems, with applications to computers, circuits, systems, control, communications, and more.This is an exciting and emerging interdisciplinary area in which a wide range of theory and methodologies are being investigated and developed to tackle complex and challenging problems.As the host, I would like to take this opportunity to give you a general introduction about our school..Xiamen University(XMU), founded in 1921 ,is the first university in China founded by overseas Chinese.Before 1949, it was named University of Amoy.The school motto: Pursue Excellence, Strive for Perfection(自强不息, 止于至善).Now this university ranked the 13th in China, which is in the front rank in China and maintain the top 20 ranking in china.This university is one of the comprehensive universities directly affiliated with the Education Ministry, is located in the city of Xiamen in Fujian Province.In 1995 it was included in the list of the “211 Project” for the state key construction;in 2000 it became one of China’s higher-level universities designated for the state key construction of the “985 Project”.For this conference, we are following the agenda here.The meeting is supposed to last for three days，and to be separated into two parts.To begin with , we’ll invite some representatives from our guests to give lectures about their latest researches and reports on the iue, and then we will have some symposiums.During the conference we are pleased to be your guide to this city.If anything needed, don’t hesitate to contact us.We believe by our collaboration we are sure to make this gathering a consummation.And finally I wish you an unforgettable and prefect experience here.Thanks!

英文会议演讲稿篇2：英文国际学术会议开幕词演讲稿

Distinguished guests, distinguished delegates, ladies and gentlemen, and all the friends:

At this special time of wonderful March, in this grand hall of the beautiful campus, Our respectable guests are here getting together.Jointly sponsored by China Remote Sensing Aociation, undertaken by Remote Sensing Institution of NUIST at Nanjing, the first International Conference on Remote Sensing technology , will be open.Now, First of all, please allow me to give our hearty welcome to all of you present, and thank you , for your friendly coming.We feel so proud, and appreciated as well to be the host of the event.It is a great honor for us to have all you here to attend this conference, of which the theme is the academic exchange about the advanced technologies on RS.Here I’d be delighted to introduce our conventioneers in brief.Apart from our faculty and students, Most of the delegates and guests are prestigious experts and scientists, who are related in these fields from all over the world.With many significant achievements, they are the most dynamic leaders in the movements of the science and technology.As the host, I would like to take this opportunity to give you a general introduction about our school.Nanjing University of Information Science Technology(NUIST), founded in 1960 and renamed from Nanjing Institute of Meteorology in 2004, was designated in 1978 as one of the key institutions of higher learning in China.The university consists of 24 departments or colleges, 12 scientific research institutions and one international training center.The university, covering an area of 140 hectares with a floor space of 420000 square meters, boasts 42 basic and special laboratories such as Key Laboratory of Meteorological Disasters and Sino-American Remote Sensing Laboratory.With a total collection of over 1,170,000 books, the library was listed as one of the most completed literature libraries in China in terms of atmospheric sciences.For this conference, we are following the agenda here.The meeting is supposed to last for three days，and to be separated into two parts.To begin with , we’ll invite some representatives from our guests to give lectures about their latest researches and reports on the iue, and then we will have some symposiums.During the conference we are pleased to be your guide to this city.If anything needed, don’t hesitate to contact us.We believe by our collaboration we are sure to make this gathering a consummation.And finally I wish you an unforgettable and prefect experience here.Thanks!

英文会议演讲稿篇3：英语国际会议报告演讲稿

Good morning everyone!It is my pleasure to give a presentation here.As a student whose major is safety engineering, I’d like to introduce a safety evaluation method today, the LEC evaluation.As the PPT shows, my presentation is mainly divided into three parts.Firstly, let me introduce LEC briefly.Maybe some of you have learned about LEC in college, it is used to ae the degree of danger when people work in potentially dangerous environment.It is a half-quantitative safety evaluation method which claifies one certain system and determine if the system is safe enough.Then, what does each letter mean?D means danger, it shows how dangerous the system is.L means likelihood, it shows the poibility of the accident.E means the extent of exposure, it shows that how often do workers work in dangerous environment.C means consequence, it shows the severity of accidents.Here ,it is a chart, each part is divided into several levels.Take the likelihood as an example, it has seven levels, the points range from 0.1 to 10 as the poibility rising.And if the score of D is over 320,itmeans this system is extremely dangerous and cannot continue operating.Through LEC evaluation, we can make sure if we need to rectify and reform the workplace, so that we can take some measures for safety to avoid accidents.It is easy to use and it is feasible for the situation which is lack of specific evaluation models or data.The LEC method is widely used in various fields, such as aircraft industry, railway industry, metallurgic industry, coal-mining industry and so on.The usage of LEC doesn’t have many differences.Firstly, we should select the evaluation unit, thenidentify the main danger in the unit.Next , we need to evaluate the danger by using that chart and get a conclusion.

第3篇：国际会议的演讲稿

国际会议的最终演讲稿

good afternoon ladies and gentlemen: my name is shaoshasha,i am a senior in china jiliang university and majoring in busine management.i am honored to be here to deliver an introduction of our group case study.this is our team member tanglihua ,sundan and me as we all know.sony and lenovo both enjoy high reputation among the ma.therefore, as a famous brand over asia, sony competes with lenovo in domestic market only by obtaining the knowledge of the comparative disadvantage and corresponding betterment, and this is the primary iue we should to settle.taking the customers#39;demand as an base, we launched a market research and thereby get an understanding that the technical standard is the computer’s feature.since qfd is of great usefulne in analyzing dates, we apply it in our study in order to figure the approach of sony‘s improvement.in addition, quality function deployment is to help transform the customer wants into engineering characteristics for a product or service, prioritizing each product or service characteristic while simultaneously setting the development targets for the product

——文章来源网络整理，仅供参考 or service.then according to the qfd analysis，we could get the new technical standards.based on market research we are able to get the customer satisfaction form.according to the form, we can figure that customers pay attention to laptop#39;s proceing speed, weight, memory mount and corresponding cognition and perception.technological indicators for proceing speed are basic frequency and internal memory, for weight is material, size and thickne;for volume is hard disk.these are the features for these technical indicators, in term to lenovo and sony.then let me to explain qfd of snoy laptop.first we rank the significance degree of customer need thereby to conclude the planning matrix.after customer needs are known, we can get technical requirement quality table relevancy, relationship matrix and correlation matrix(影响程度划分表)after completing the above analysis, the house of quality is our final plan.from the key qualities characters setting, sony takes a leadership in basic frequency, material and hard disk.with drawbacks in size and thickne.while internal memory is neck and neck between us and lenovo.therefore we draw conclusions as follows:

——文章来源网络整理，仅供参考 1、in terms of basic frequency, lenovo performs better, however, the difficulty for improvement is relatively high.therefore, it is better to develop the attributes later rather than now.2、the amount of memory of sony and lenovo are equal;correspondingly we can take several steps to target a competitive advantage.3、as for material, sony has a patent for using light material and in contrast, lenovo does not.as a result, sony has an advantage.however, there are also some shortcomings, for instance: reliability.therefore.we should learn from the other competitors in order to improve our products.4、when it comes to the size, sony has some advantages, whereas size is the attribute which is of the lowest technological difficulty.hence in order to beat the competitors in the market, sony should be le than 11 inch.5、the thickne of sony is among the best in the opening market;however it is difficult for development.consequently ir would better be delayed the technological improvement.6、the most important one is hard disk, there is much potential for improvement ,therefore we want that the hard-disk can turn to 250g.——文章来源网络整理，仅供参考 from the improving goals, we can see the improvements we made in parameters of size and hard-disk to get the new technical standards this is our qfd analysis.if you have any comments about our case analysis, you are welcome to contact us.thanks for your time.——文章来源网络整理，仅供参考

第4篇：模拟国际会议演讲稿

Recsplorer:Recommendation Algorithms Based on Precedence Mining

1.Introduction Thank you very much, Dr.Li, for your kind introduction.Ladies and gentlemen, Good morning!I am honored to have been invited to speak at this conference.Before I start my speech, let me ask a question.Do you think recomemdations from others are useful for your internet shopping? Thank you.It is obvious that recommendations play an important role in our daily consumption decisions.Today, my topic is about Recommendation Algorithms Based on Precedence Mining.I want to share our interesting research result on recommendation algorithms with you.The content of this presentation is divided into 5 parts: in seion 1, I will intruduce the tradictional recommendation and our new strategy;in seion 2, I will give the formal definition of Precedence Mining;in seion 3, I will talk about the novel recommendation algorithms;experimental result will be showed in seion 4;and finally, I will make a conclusion.2.Body Seion 1: Introduction The picture on this slide is an instance of recommemdation application on amazon.Recommender systems provide advice on products, movies,web pages, and many other topics, and have become popular in many sites, such as Amazon.Many systems use collaborative filtering methods.The main proce of CF is organized as follow: first, identify users similar to target user;second, recommend items based on the similar users.Unfortunately, the order of consumed items is neglect.In our paper, we consider a new recommendation strategy based on precedence patterns.These patterns may encompa user preferences, encode some logical order of options and capture how interests evolve.Precedence mining model estimate the probability of user future consumption based on past behavior.And these probabilities are used to make recommendations.Through our experiment, precedence mining can significantly improve recommendation performance.Futhermore, it does not suffer from the sparsity of ratings problem and exploit patterns acro all users, not just similar users.This slide demonstrates the differences between collaborative filtering and precedence mining.Suppose that the scenario is about course selection.Each quarter/semester a student chooses a course, and rates it from 1 to 5.Figure a)shows five transcripts, a transcript means a list of course.U is our target student who need recommendations.Figure b)illustrates how CF work.Aume similar users share at least two common courses and have similar rating, then u3 and u4 are similar to u, and their common course h will be a recommendation to u.Figure c)presents how precedence mining work.For this example, we consider patterns where one course follows another.Suppose patterns occour at least two transcrips are recognized as significant, then(a,d),(e,f)and(g,h)are found out.And d, h, and f are recommendation to u who has taken a, g and e.Now I will a probabilistic framework to solve the precedence mining problems.Our target user has selected course a , we want to compute the probability course x will follow, i.e., Pr[x|a].﹁howerve, what we really need to calculate is Pr[x|aX] rather than Pr[x|a].Because in our context, we are deciding if x is a good recommendation for the target user that has taken a.Thus we know that our target user’s transcript does not have x before a.For instance, the transcript no.5 will be omitted.In more common situation, our target user has taken a list of courses, T = {a,b,c,…} not

﹁just a.Thus, what really need is Pr[x|TX].The question is how to figure out this probability.I will answer it later.Seion 2: Precedence Mining We consider a set D of distinct courses.We use lowercase letters(e.g., a, b, …)to refer to courses in D.A transcript T is a sequence of courses, e.g., a-> b-> c-> d.Then the definition of Top-k Recommendation Problem is as follows.Given a set transcripts over D for n users, the extra transcript T of a target user, and a desired number of recommendations k, our goal is to: 1.Aign a score score(x)(between 0 and 1)to every course x ∈ D that reflects how likely it is the target student will be interested in taking x.If x ∈ T , then score(x)= 0.2.Using the score function, select the top k courses to recommend to the target user.To compute scores, we propose to use the following statistics, where x, y ∈ D: f(x): the number of transcripts that contain x.g(x;y): the number of transcripts in which x precedes course y.This slide shows the calculation result of f(x)and g(x,y).For example, from the table, we know that f(a)is 10 and g(a,c)is 3.We propose a precedence mining model to solve the Top-k Recommendation Problem.Here are ﹁some notation: xy, which we have memtioned in seion 1, refers to transcript where x occurs without a preceding y;x﹁y refers to transcript where x occurs without y following it.We use quantities f(x)and g(x,y)to compte probabilities that encode the precedence information.For instance, from formular 1 to 7.I would not tell the detail of all formulars.We just pay attention to

﹁formular 5, note that this quantity above is the same as: Pr[x﹁y |yx] which will be used to compute score(x).As we know, the target user usually has taken a list of courses rather than a course, so we need to

﹁extent our probability calculation formulars.For example, suppose T={a,b}, Pr[xT] the probability x occurs without either an a or b preceding it;Pr[x﹁T] the probability x occurs without either an a or b following it.This probability can be calculated exactly.So how to calculate it?

Seion 3: Recommendation Algorithms Let’s review seion 2.The main goal of the recommendation algorithms is to calculate the score(x), and then select the top k courses based on these scores.Traditional recommendation algorithms compute a recommendation score for a course x in D only based on its frequency of occurence.It does not take into account the courses taken by the target user.Our recommendation algorithms called SingleMC conquer the shortcoming of the traditional ones.It computes the score(x)using the formular 5.The detail is as follows: a student with a transcrip T of taken courses, for the course y ∈ T, if y and x appear together in transcripts satisfies the

﹁threshold θ, then compute the Pr[x﹁y |yx], reflecting the likelihood the student will take course x

﹁and ignoring the effect of the other courses in T;finally the maximum of Pr[x﹁y |yx] is choosen as the score(x).Here is the calculation formular of score(x)of SignleMC.For example, with the higer score, d will be recommended.Another new recommendation algorithm named Joint Probabilities algorithm, JointP for short, is proposed.Unlike SingleMC, JointP takes into account the complete set of courses in a transcript.In formular 12, we cannot compute its quantity exactly, Remember this problem we have mentioned.Our solution is to use approximations.This slide is about the first approximating formular.And this the second approximating formular.The system is courseRand, and data set for experiment contains 7,500 transcripts.This slide shows the new recommendation algoritms with black color and the traditional ones with blue color.The chart on this slide indicates our new recommendation algorithms beat the traditional ones in precision, because the former ones exploit patterns acro all users, while the latter ones just use the similar users.The chart on this slide points out our new recommendation algorithms also beat the traditional ones in coverage for the same reason.Seion 5: Conclusion and Summary In conclusion, we proposed a novel precedence mining model, developed a probabilistic framework for making recommendations and implemented a suite of recommendation algorithms that use the precedence information.Experimental result shows that our new algorithms perform better than the traditional ones, and our recommendation system can be easily generalized to other scenarios, such as purchases of books, DVDs and electronic equitment.To sum up, first, I introduced the motivation and the outline of work;second, I gave the definition of precedence mining model;third, I described some new recommendation algorithms using precedence information;forth, I showed our experimental results to compare the new algorithms with traditional ones.Finally, I made a conclusion of our work..That’s all.Thank you!Are there any questions?

第5篇：国际会议英语演讲稿

下面请看参加国际会议的英文版演讲稿

On the International Day of United Nations peacekeepers, we honour the sacrifices of the men and women who lost their lives while serving under the UN flag.This year's commemoration is a somber one.The past 14 months have been especially deadly for UN peacekeeping.Ambushes in Darfur...Terrorism in Kabul...And a plane crash in Haiti...These were among the tragedies that struck peacekeeping last year, killing 121 people.That toll was nearly matched in a few seconds with the devastating earthquake that struck Haiti last January.The United Nations Stabilization Miion in Haiti lost 96 peacekeepers--the biggest single lo of life in peacekeeping history.But that dark day also became one of our finest hours, as the men and women of MINUSTAH set aside their own trauma, got the miion quickly back on its feet, and helped the people of Haiti cope with the horrific aftermath.As we honour such moving displays of courage and dedication, we also pay tribute to the more than 122,000 military, police and civilian personnel who serve with distinction in our operations acro the world.Their efforts directly help millions of people...By providing security and promoting reconciliation...By clearing land-mines and demobilizing combatants...By strengthening institutions and the rule of law...By delivering aid and repatriating refugees and displaced persons

By supporting democratic elections, reforming the security sector...and so much more.peacekeeping is an indispensable part of the UN’s work for a better world.Let us give it the support it needs to succeed.

第6篇：模拟国际会议演讲稿

1.Introduction Thank you very much.Mr.Jiao, for your kind introduction.Ladies and gentlemen, Good afternoon!My name is Lijia, came from Harbin Engineering University.I am honored to have been invited to speak at this conference.Before I start my speech, let me ask a question.Do you know what can affect the properties of foam concrete? Do you think how to reinforced the properties of foam concrete？Most of the investigations on foam concrete in the past have been conﬁned（被限于）to neat cement paste, cement paste with partial replacement with admixtures and to cement–sand mixes.Today, my topic is about Inﬂuence of ﬁller type on the properties of foam concrete.I want to share our interesting research result on reinforced concrete frame with you.The content of this presentation is divided into 4 parts: In section 1, I will introduce what is the foam concrete.In section 2, I will talk about Parameters investigated and mix compositions.In section 3, I will give Eﬀect of water–solids ratio on design density.And finally, I will make a conclusion.2.Body Section 1: the foam concrete Now, I will introduce the foam concrete.Pre-formed(成型的)foam concrete is manufactured（加工）by adding foam, prepared by aerating（充气）a foaming agent solution, to cement paste or cement mortar（灰

浆）.The composition（合成物）, physical properties（性能）and uses of foam concrete were discued in detail（详细的）by Valore, Short and Kinniburgh, Rudnai and Taylor.Although several investigations have been conducted on the properties of foam concrete, most of them deal with cement–sand mixes, neat cement paste with or without partial replacement（局部替换）using admixtures（掺合料）.Few studies report on the inﬂuence of ﬁller type on the properties of foam concrete.By using ﬂy ash（粉煤灰）as ﬁller(ﬁne aggregate细骨料)instead of sand, the high volume（体积）utilization（利用）of ﬂy ash becomes poible可能, thus providing a means of eco-nomic（经济）and safe disposal（处理）of this waste product.Comparison（比较）of strength of air-cured foam concrete made with cement-sand and cement–ﬂy ash for masonry（砌体结构）by Durack and Weiqing show that for products of comparable density（比较密度）, mixes with ﬂy ash as ﬁne aggregate in place of sand gave relatively higher strength.Section 2: Parameters(参数)investigated and mix compositions（组成成分）

So much for the foam concrete, now I will move on to Parameters(参数)investigated and mix compositions.As the experimental programme(实验程序)was aimed at studying the eﬀect of the ﬁllers on the properties like density（密度）, ﬂow behaviour（流动特性）, water absorption（吸水率）and strength of foam concrete, the following mixes

were investigated by keeping the basic ﬁller–cement ratio constant（恒定不变）at 1:1 by weight.The foam required for three densities（密度）of foam concrete viz.1000, 1250, 1500 kg/m3 were arrived at as per ASTMC 796-97.In the cement–sand–ﬂy ash mixes 50% of the sand is replaced with ﬂy ash and in the cement–ﬂy ash mixes all the sand is replaced with ﬂy ash.Section 3: Eﬀect of water–solids ratio（水砂比率）on design density That bring me to Eﬀect of water–solids ratio（水砂比率）on design density.I think this part is the most important in my presentation, I will explain in detail.As the foam is added to the wet foam concrete mix, the consistency（稠度）of the wet mix is very important to get the design density.Fig.2(a)and(b)show the variation of density ratio（密度变化率）(measured fresh density divided（分离）by design density)with water–solids ratio for mixes with diﬀerent ﬁller type for each of the design densities, viz., 1000 and 1500 kg/m3, respectively（分别地）.It is observed that at lower water–solids ratios, i.e., at lower consistency, the density ratio is higher than unity（个体）.The mix is too stiﬀ（严格地）to mix properly thus causing the bubbles（气泡）to break during mixing resulting in increased density.At higher water–solids ratios there is also an increase in density ratio as higher water contents make the slurry（泥浆）too thin to hold the bubbles resulting in segregation（分离）of the foam from the mix along with segregation of the mix itself thus causing

an increase in measured density.Therefore, as shown in Fig.2(a)and(b), a density ratio of unity or nearly unity is achieved only at a particular consistency.This consistency requirement for the mix before adding foam to it can be expreed in terms of water–solids ratio.It is also observed that the water–solids ratio required to obtain a density ratio value of one, depends on the ﬁller type.Section 4: Conclusion The conclusions drawn from this study and summarized below are applicable（合适的）to the characteristics of the materials（材料特性）used and the range of parameters（参数范围）investigated:(i)the consistency of pre-formed foam concrete mixtures(deﬁned as the water–solids ratio for achieving the target（目标）density)mainly depends on the ﬁller type, i.e., relatively higher for mixes with ﬂy ash as ﬁller compared to mixes with sand;(ii)the ﬂow behaviour mainly depends on the foam volume and as the foam volume increases the ﬂow decreases.For a given density, foam concrete with ﬂy ash as ﬁller showed relatively（相当的）higher ﬂow values;(iii)for a given density, an increase in ﬂy ash content of the mix results in increased strength.In comparison（比较）to cement–sand mixes, cement–ﬂy ash mixes showed relatively higher water absorption（吸收）.That’s all.Thank you!Are there any questions?

The picture on this slide is

So much for......, now I will move on to......This slide shows the calculation result

As we know, the target user usually has taken a list of courses rather than a course, so we need to extent our probability calculation formulars.For example, suppose T={a,b}, Pr[x﹁T] the probability x occurs without either an a or b preceding it;Pr[x﹁T] the probability x occurs without either an a or b following it.This probability can be calculated exactly.So how to calculate it?

That bring me to Recommendation Algorithms.I think this part is the most important in my presentation, I will explain in detail.In conclusion, we proposed a novel precedence mining model, developed

To sum up, first, I introduced the motivation and the outline of work;second, I gave the definition of precedence mining model;third, I described some new recommendation algorithms using precedence information;forth, I showed our experimental results to compare the new algorithms with traditional ones.Finally, I made a conclusion of our work..That’s all.Thank you!Are there any questions?