国际学术会议发言

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国际学术会议发言

1. Prologue

国际学术会议发言

Thank you, Mr. Chairman, for your gracious introduction. I am honored to have the chance to address you on this special occasion. The topic of my pa-pe-r is “Transaction Cost and Farmers’ Choice of Agricultural Products Selling”. The outline of my talk as follows. The first part I want to introduce the background of this research. The second part suggests a si-mp-le household choice model .The third part covers the data used in this research. And then, we introduce the empirical results. Finally, a si-mp-le conclusion is given.

2. Introduction

Well, let’s move on the first part of this topic .The motivation of this work like this. Institutional economics posits that agents ma-ki-ng decisions on different types of transactions do so in a costly way .For example , farmers deciding sell a particular crop to whom base their decisions not only on the price they expect to receive in each market choice but also on additional costs related to transacting in these markets.

I want to use a picture to illustrate it. For example, given some market channels, farmers’ choices can be regarded as equilibrium between the surplus and the additional costs that related to transacting .Especially in developing countries, high-value crop producers fully participate in the market and the transaction cost has been the hard constraint to farmers. Furthermore, Farmers’ market choices can be taken as a choice dilemma of transaction cost and production surplus. Consequently, the scientific question of this research is how transaction cost affects planters’ choices.

3. Methodology

Let’s move to the theoretical model of our research. Consider a household model in one rotation. In stage 1 , famer η needs to allocate the input factors .This process can qbe set into a function like this Q Q ( p , w , z ) , Qη means the output farmers decide qto produce .p implies the Output price W implies Input Price and. z: is fixed input. Once produce what and produce how many are decided, next question to be considered is how much products to be transacted in market. Here we use three cc()Cη means how functions to describe this question. The first equation, c p , z

much agricultural products used by famers themselves. p implies the price the cagricultural product, z suggests the fluctuation of Cη. The second equation q Q c , qη means the amount of agricultural products transacted in

qnmarket. The third equation i q implies the amount exchanged in nth time.

In Stage 3, farmers will decide to sell the products to whom. Chanel j’s market price is

bdecided by an exogenesis price and farmers’ negotiating power. pijp*

jB(qi,zi)Besides this, we use a matrix to show the net profit of Chanel j X ik ik , ik

and then farmers’ choice can be expressed in a typical choice model

exp(Xij)Pr(jij|Xik)1 exp(Xij) k1

Based on the choice model, another important concept is famers’ channel choice .Here, we set five types .They rank by the market barriers. Accordingly, we set a group discrete number to express them. Y: dependent variable Y=5,means farmer choose

brokers. Y=1, farmers sell products to consumers directly.

4. Data and estimation procedures

Here, we illustrate the data distribution with this map. According to the Agricultural regionalization from Department of Agriculture, The apple specialization areas in China contain two parts: Bo Sea area and Loess Plateau. Bo Sea Area in red color, contains Hebei, Shandong and Liaoning 3 provinces. And Loess Plateau in green color, contains Shanxi, Henan, Shaanxi and Gansu 4 provinces. Firstly, we use PPS method to get the first stage sampling unit 14 counties in 7 provinces. Then use random sample method to get village and household. They are our sample distribution.

5. Empirical Results

6. Conclusions

国际会议作报告英语发言稿2016-12-19 23:35 | #2楼

Thank you, prof. …. My name is ….. I’m from ….. I am very pleased to be here to join this forum. The topic of my presentation is properties of rapid construction materials for soil pavement of field airfield. As is shown in the picture, the main parts of my research are about soil pavement.

My presentation will include these four parts:

First, some background information about this research; second, the main work we have done; third, some conclusions we have got and the last: innovation and presentation of our published pa-pe-rs.

Why I choose this item? I think it can be illustrated from the following four parts. First, the existing quantity of airfields is still not sufficient and the airfields have many shortcomings especially in war time. Second, the complementary facilities, such as highway runways are far less than airfields, however, have more weakness. Third, a certain amount of field airfield is quite necessary considering some emergencies such as rescue and disaster relief. Forth, the field airfield can fill the void of airfield and they can be combined to be airfield network.

The meaning and aim of this research contains three parts. Fast, convenient and validity, fast means the field airfield must be constructed

as fast as possible, convenient means the construction should need the minimum equipment, labor and materials considering the actual construction condition, validity means the constructed airfield is able to support the operation of given aircraft in specifically time.

Just like many other territories, the situation of the research is that the U.S. Army takes advanced line. The U.S. Army declares that they can reach to anywhere on the earth in 96 hours, the most important method for force projection is though aircraft, thus rapid construction of pavement is the key problem for rapid force transportation.

The main work we have done can be summarized as four parts, materials choosing, scheme ma-ki-ng, mechanical properties research and water-stable properties research.

We choose two kinds of soils, which are got from Xi’an, Shanxi province and Jiuquan, Gansu province separately. The sand from Ba River was considerate to investigate the influence of sand to the properties of stabilized soil. The chosen three kinds of powders are cement, lime and new-type stabilizer developed by Chang’an University. The principles in considering the function of 4 kings of fibers are referring different length, type and mixing them.

On account of the time, I will make a brief description about the experiment scheme. In summary, three parts were proposed to distinguish the affecting factors in ma-ki-ng experiment scheme. They are powder control, fiber control and other factors. Taking powder control for example, the dosage of cement is respectively 6%, 8% and 10% when the soil is stabilized only by cement, while the dosage of cement decrease to 3%, 5% and 7% when the lime is addicted to stabilized soil. The following two factors are stabilizer and sand.

Six kinds of experiments were performed to investigate the influence of above factors to the mechanical properties of stabilized soil. The aim of compaction test is to find the maximum dry density and optimum moisture content. The aim of compression strength test is to determine the optimum dosage of cement, lime, powder stabilizer and fiber, meanwhile evaluating the performance of stabilized soil. The aim of splitting tension strength test is similar to compression strength test, the left picture is sample stabilized by cement, while the right picture is the sample stabilized by fiber and cement. The direct sheer is another important parameter in geotechnical engineering. It influences the foundation bearing capacity and many other properties especially for soil base and base course. The left picture shows the course of ma-ki-ng

sample and the right picture shows the test process.

The CBR test and rebound modulus test are referenced from highway test specification to evaluating the comprehensive capacities of each structure level of the pavement. For both the two tests, the left picture shows the course of ma-ki-ng sample and the right picture shows the test process. What should be noted is that the number of sample is at least 6, the last result is the average value of these date got from test after eliminating the bad results.

Four kinds of experiments were performed to investigate the influence of above factors to the water-stable properties of stabilized soil. The scouring test is not the stated experiment in current specification. It is performed by us through looking up large quantity of interrelated literature, and two different ways to carry out. The left picture shows the method of vibration table and the right picture shows the method of fatigue test instrument. Penetrant test refers to the experiment in relating concrete specification. The left picture shows the process of saturation, the right picture shows the test process.

Cantabria test and other tests are all original experiments; they are used in stabilized soil for first time, here I will not develop my narrative.

As regards the innovation, I think it throughout the whole research, including materials choosing, scheme ma-ki-ng, mechanical and water-stable experiments. I think it can be drawled from the following keywords, such as soil choosing, sand, powders, fibers, and so on. Three main parts can be summarized. First, se-le-cting two kinds of soils, three kinds of powders, several combinations; second, several kinds of fibers, different length and admixture; third, comprehensive experiments, test method and test instrument.

英文国际学术会议开幕词演讲稿2016-12-19 17:31 | #3楼

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 Association, 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 issue, 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!

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