Technology 100 (2009) 1192–1196 Contents lists available at ScienceDirect Bioresource Technology journal homepage: www.elsevier.com/locate/biortech Optimization of culture conditions for hydrogen production by Ethanoligenens harbinense B49 using response surface methodology Wan-Qian Guo a‚ Nan-Qi Ren a‚*‚ Xiang-Jing Wang b‚ Wen-Sheng Xiang b‚ Jie Ding a‚ Yang You a‚ Bing-Feng Liu a a b State Key Laboratory of Urban Water Resource and Environment‚ Harbin Institute of Technology‚ Harbin
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series of high-speed rail lines in order to reduce short-haul air flights. To what extent might CBA be a useful method of evaluating this proposal? The Basic Economic Problem is that needs and wants are unlimited but resources are limited. Cost Benefit analysis (CBA) is a technique for assessing the monetary and social costs and benefits of a capital investment project over a given time period. It is by this method that we decide to which project proposal our limited resources go. CBA has traditionally
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having computers; I will try to show you good and bad sides of using them. In the first place‚ a computer is a really comfortable‚ convenient and helpful thing; it often makes lots of work for us which normally consumes plenty of time.Another useful thing is that computers now are often small and we can take them wherever we want. We can use them f. ex. in planes‚ restaurants or in same waiting rooms.An additional advantage of using the computer is that we can develop our computer skills and we can
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can communicate through the distances and Skype makes us easier to communicate with each other. Until September 2011‚ Skype has 663 million registered users around the world. I.2 Problem 1. What is Skype and what are its features? 2. How to operate Skype? 3. What are the advantages and disadvantages of using Skype? I.3 Purposes The purposes of
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been produced to facilitate our living. One of them was the mobile phone. When the first one was launched in 1973 by a company called Motorola‚ a new lifestyle with many new attributes has been established. What are the benefits that it has brought to us? In my opinion‚ there are three advantages that it has: communication‚ entertainment‚ and providing benefits. The first important one is global communication. Cell phone allows us to communicate with our family and friends no matter where they are
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Nowadays‚ the internet is a widely used instrument‚ without which the modern human might find it difficult to properly function. Every new technology has its ups and downs and the internet is no exception to this rule. Among the positive aspects related to the internet‚ one can mention the huge amount of information that can be found‚ helping the users stay informed and able to search for any type of data. The internet can also ease all kinds of daily activities that would usually be time consuming
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instance‚ you want to buy some goods online‚ you have to provide some of your information to the website so that they can deliver them to you. Maybe your information is hacked and the hackers can use it for much bad purpose like buying other things using your account...Your e-mail box can receive some spam that you don’t want and you feel unsafe when you think that a person is following you in some ways. Furthermore‚ although we can use the Internet as a means of entertainment with a lot of interesting
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At present computers are usually used in many walks of our life. What they mean for us? They have many applications in science‚ technology. Since they were invented in 1948 they have became necessary in our life. Even so computers have also some disadvantages.Using computers offers many pros. Firstly‚ owning to computers we can keep accounts‚ write personal letters and do our homework. It is much easier and more aesthetic to write something in computer and print it than type or pen. Also‚ computer
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What is the centroid method? Would this be an appropriate method for your organization to rely on? The Centroid method is a technique for locating single facilities that considers the existing facilities‚ the distances between them‚ and the volumes of goods to be shipped. My organization does not ship goods to other facilities‚ but we use the centroid method to determine the distance between other city agencies that will enable us to provide our services. City agencies need to be able to pick
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Advantages of the use of the scientific method in psychology There are a number of advantages to using scientific methods in psychology. Firstly an important aspect of imperial data is that it is objective‚ i.e. not affected by expectations of the research. So‚ without objectivity we have no way of being certain that data collected is valid. An example of this is seen with Gardner & Gardner. When they observed Washoe they might have judged that Washoe was using real words because they wanted
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