Tuesday, September 4, 2007
Think about this...
Friday, August 24, 2007
From time to time we hear, here in Brazil, some bureaucrat (sometimes even governors and presidents) talking about "applied" (meaning, technological) research as a kind of opposite to "fundamental" (meaning, academic) research. Although this kind of nonsense is also observed in other countries (particularly I remember one of the last ministers of science and technology of the Kohl government in Germany saying something like that), it seems to be more widespread here under the equator.
In my opinion there are only two kinds of researches: good ones and bad ones. Of course some misguided minds of the academy may be doing research only for the sake of the research. This is not "academic", it is simply bad! As it is bad to do technological research funded only by government money, without a (paying) link from the industrial sector of the country. Should we do "free" research to foster our industry? This should be denounced to the WTO as a hidden economic subside!
I agree that a government should be allowed to promote research in some critical areas, like it was the case of the genoma project, but the creativity of the scientist should not be hindered by allowing only "meaningful" research to be funded.
Let us prove this by absurd, suppose we decide to fund only socially relevant science. Surely a noble intent. Who will decide what is socially relevant? It is my guess that this will be done by a committee of three to four people. Suppose the wisest scientists are chosen to form this commission (not likely to happen), even so we exchange about 10000 thinking heads by three to four! As the popular wisdom tells, 10000 heads think better than three to four.
Another reason to let the researcher do science at his/her will is the impact on the new generations. Once I was lecturing materials science for the freshmen's year of the Escola Politécnica and there was this exercise about carbon nanotubes. After the class, one student asked me who has working on that in my department. I answered that no one did and that the technology behind that exercise was so weird (it was an experiment by IBM, who built a CMOS transistor using a carbon nanotube as gate, mounting it using an AFM) that it was unlikely that this would become commercial anytime soon. But who knows? Suppose that a real breakthrough in microelectronic device technology would come by some similar technique. Should our engineers need to learn after the university what is a carbon nanotube to survive in the job market? Research in those areas, which are not directly linked to the country reality, is necessary for the sake of our students. They must be well prepared to face the competition and this can be done only by lecturers who are aware of the major developments in the world, and this is done using research.
Sunday, May 13, 2007
I was impressed by the large amount of presentations concerning the convenience or inconvenience of changing the description of pure elements, with the introduction of some physically based equation of state to handle the pressure/volume state variables. As mentioned by Larry Kaufman, these changes would require major changes in the thermodynamic descriptions of all systems, which surely is a huge task. In my opinion this is true, but someone will eventually start doing this. I believe that the actual descriptions will coexist with new, improved, physically-based models, until these acquire the same coverage of described systems and the same level of confidence of the existing models.
Another highlight of the last meeting was the elevated number of presentations dedicated to the use of the existing models and thermodynamic databases to modeling derivate thermodynamic properties, which are not usually experimentally determined, like viscosity of molten slags (Nicholas Grundy, using FactSage), surface tension (Risto Pajarre) and solder wettability (Zbigniew Moser).
As always Prof. John Morral´s presentation was a show! The "lecture" dealt with teaching phase diagram topology to undergraduate students. The techniques described have high learning potential for this arid topic (at least to our students).
The most impressive presentation was due to Prof. Dr. Byeong-Jo Lee, of the Pohang University in South Korea. He showed how standard thermodynamics, incorporation capillarity effects through tyhe Gibbs-Thompson equation was able to justify size-effects observed in nanotechnology. He exemplified considering two cases: the size-dependency of melting point in platinum nanoclusters and nanowires and the size-dependent composition of Si-Ge nanowires. His results clearly show that the usual thermodynamic tools are valid up to a quite small scale, which would not be accepted by most physicist as possible.
In the social side we had a pleasant meeting, as always. Most of the participants know each other from previous CALPHADs and the new participants are well received in general, so they quickly become part of the family. One anonymous (so nobody will be hurt due to the authorship, literally) quotation, which all participants agreed, clearly defines the CALPHAD meeting was "It was so much alcohol!" (referring to something that happened in last year´s CALPHAD, in Israel). Could not be perfectly realized in the present meeting due to the unusual closing time of the hotel bars (9 pm) and the long distance to the town, but even so we had our liquid amount available :-).
The conference excursion was to the Gettysburg battlefield. We were blessed with a sunny day as can be inferred from these photos. It was an unusual excursion, I had never visited a battlefield before. And sometimes it was a little bit awkward to walk literally over the grave of so many dead people. Our competent and passionate guide helped us to overcome this strange feeling and allowed to us, foreigners, to have some insight on the way that the Americans handle these historical events.
The banquett was very nice. The following photos show our table. As you can see, the motto was, "there is always one place more" ;-).
Finally, one has to mention our trip to the Mad Mex bar in State College. Of course, only some of us still had some energy after five days of drinking (err..., I mean, of congress), but nevertheless, it was fun. My congratulations to the "Stone Arrogant Bastard Ale", which could be easily renamed "Stone Arrogant Bastard Bitter Ale". I finish this report with some of the pictures of that night.
Wednesday, April 18, 2007
Ethanol as automobile fuel and the brazilian PROALCOOL project: interview with Prof. Dr. Stephan Wolynec
Prof. Dr. Stephan Wolynec is full professor (emeritus) at the Department of Metallurgical and Materials Engineering of the Escola Politécnica da USP. He is one of the most important brazilian researchers in the field of metallic corrosion and was deeply involved with the PROALCOOL project since the begining. I invited him for an interview and he, graciously, accepted. The content of this interview follows...
(Noted added for the help of the reader: Telex is an ancient communication medium, found today only in Technology Museums around the world - it was the poor equivalent of an e-mail twenty to thirty years ago).
CGS: Please review the role of the university and of the research centers in the PROALCOOL project.
SW: The use of ethanol as a substitute of gasoline in cars in Brazil was motivated by the petroleum crisis started in 1973, which was aggravated in the last years of that decade. To overcome this situation, the Brazilian government launched the “Proalcool” program, through which it stimulated the car manufacturers to develop an ethanol fuel powered car.
The response of car manufacturers was positive, and their initial concern was basically directed, as expected, to optimize the parameters responsible for the engine performance. It was believed that it was sufficient to replace the engine of the gasoline powered car by the new engine to obtain the ethanol fuel powered car. However, it was soon realized that the ethanol fuel was not compatible with most of the materials used in the gasoline car due to corrosion problems, and that the undertaking of new materials selection was mandatory.
Two manufacturers (Fiat and Volkswagen), after adopting some surface treatments in some components of the gasoline car, started the production of ethanol fuel powered cars in the beginning of the 80’s. A euphoric start of a new automotive transport era was witnessed, which gradually began to fade due to the technical shortcomings of the new vehicle, which had in corrosion its implacable enemy. The complaints of bad performance of the vehicle, difficulties in starting the engine in cold days, the high fuel consumption, were growing, and the sales of these vehicles were collapsing. It seemed that the ethanol car had no chances to compete with its older brother, the gasoline car. However, in August of 1980 the government summoned a meeting between the car manufactures, universities and research institutes in order to discuss the possibilities of a collaborative work to solve the corrosion problems in ethanol fuel powered cars. The response of the participants of that meeting was highly positive, and the collaborative work started almost immediately. As a consequence, in the end of 1981 the ethanol fuel powered cars were already representing more than 50% of new cars in the automobile market. The participation of research institutes and university was decisive in the solution of corrosion problems. The new ethanol car became, in terms of performance and fuel consumption as good, or even better, than the gasoline car.
CGS: Which part did you play in this?
SW: At that time I was head of the Corrosion and Electroplating Laboratory at the Technological Research Institute of the State of São Paulo (IPT). This laboratory became heavily involved in the study of corrosion and corrosion protection against ethanol fuel. We performed decisive works initially with Ford and afterwards with Volkswagen. More than 10 papers were published and a considerable amount of technical reports were issued for different manufacturers involved in the task of solving the corrosion problems in ethanol cars.
CGS: The introduction of ethanol as an automobile fuel lead to considerable corrosion related difficulties at the time. Could you please explain this to our audience?
SW: The corrosion problems in the ethanol car were observed in many components. However, the most critical was that of the carburetor. At that time the carburetors in Brazil were essentially made of Zamak alloy (zinc-aluminum-copper alloy), and only in some few cars aluminum alloy carburetors were used. Already during the development stage it was found that Zamak and aluminum alloy were not corrosion resistant to ethanol and that some protective coating was necessary. Thus, the first attempt was to apply to Zamak carburetors a double dip chromate coating, but it was soon realized that the improvement in corrosion resistance it provided was only temporary.
In the first ethanol cars the corrosion of the carburetor, which is a vital component of a vehicle, was responsible for a considerable amount of corrosion products, which were dragged by the fuel, obstructing the calibrated orifices and interfering with the normal flux of the fuel, causing frequent problems of engine adjustment and increasing the ethanol consumption.
It can be stated that the ethanol car became viable only after the corrosion problems of the carburetor were solved. This was achieved when the Zamak carburetors became plated with electroless nickel. The idea of using this type of coating come out in a meeting at IPT that I and my colleagues from the Corrosion and Electroplating Laboratory had with the people of Ford R&D Laboratory. The Ford car manufacturer was the first to produce ethanol cars with this type of carburetor.
Coatings of other components of the car had also to be substituted for new coatings resistant to ethanol fuel. Thus, in the fuel tank the lead/tin coating (terne plate) was substituted by a tin coating with an intermediary coating of copper. All zinc coated components, chromatized or not, were substituted by cadmium chromatized components.
The ethanol car, in terms of materials used in its manufacture, became significantly different from the gasoline car. More than 300 components in the ethanol car are different from those used in gasoline car.
CGS: The recent introduction of the bi-fuel engines (the so called FLEX technologies), in my opinion, was quite smooth, in the meaning the the whole development, from the idea to the production, was made in a couple of years. Does this means that the above mentioned corrosion issues have been solved?
SW: I am not acquainted with this development. But, the development of the ethanol car had a very satisfactory effect upon the Brazilian car manufacturers. Before this development, we used to joke that their R&D laboratory was the telex. Every time they had a technical problem, they sent a telex to the parent firm in Unites States or Germany, and got the answer on how to solve it. But this did not work with the ethanol car. The development of this car forced the Brazilian car manufacturers to invest in their own R&D capabilities. Thus, I believe that presently they have highly qualified people and facilities to undertake the development of such technologies as the FLEX bi-fuel engines. Moreover, with the development of the ethanol car I am sure they learned how to solve the corrosion problems.
CGS: What are the actual research challenges in corrosion in ethanol media?
SW: Up to now the corrosion mechanism in ethanol media has not been properly established. This is a scientific challenge, but if we learn about this mechanism, new methods of corrosion protection could be discovered, both more efficient and cheaper.
CGS: Was the Proalcool project a successful example of interaction between universities, research centers and industries? Have we learned something from this experience?
SW: It certainly was. We had a big challenge to develop a new type of car, powered by ethanol fuel. In no place in the world there was a ready answer for this challenge. The Proalcool program showed that by joining efforts of industry engineers with that of university and research institutes scientists it was possible to develop, without relying on imported technology, and in a relatively short time, a Brazilian know-how. From this experience we learned that the scientific and technological expertise of our universities and research institutes can efficiently support the innovation efforts of our industries.
Thursday, April 5, 2007
I found this request quite strange, specially because this experiment is not feasible. First I postponned the request, but after some insistence she convinced me to perform the calculation. One has to consider that this involved a lot of effort, since the calculation was not trivial. At the end, however, the result was surprizing.
This figure, reproduced from my thesis, illustrates this. It shows the specific heat of FCC Ni-Al system as a function of the composition, across the composition fields of Ni3Al and NiAl phases. As can be observed, a sharp local maximum of Cp is found at the stoichiometric composition of each compound (xNi = 0.5 for NiAl and xNi=0.75 for Ni3Al). Details of this calculation can be found here.
As the result was quite unexpected I rushed to my supervisor, Prof. Dr. Gerhard Inden and showed him, what I believed, was a major contribution of my thesis to science. His answer was a cold shower: "This is an artifact" (for those who are not familiar, an artifact, in the present sense, refers to a false result introduced by some error of the program used for the calculation). I, of course, believed in my result so I kept insisting this maxima were real and not an artifact. The "struggle" which followed was hard, and I finally convinced him after finding a way to prove that the maxima should indeed exist (which was quite fortunate, since I used this proof in the above mentioned paper).
After all this I contacted Suzana and sent the graphics I calculated. Only after that she told me the true story behind her request. This started when our common friend, Alessandra (Sandrinha) Kusoffsky, by then working in her Ph.D. at the Royal Institute of Technology, obtained a quite symmilar result using a different thermodynamical model and showed her supervisor, Prof. Dr. Bo Sundman. He, of course, didn´t believe the result was true and attributted it to some artifact of the calculation. Sandra then turned to Suzana asking for help. Suzana did what I consider the most amazing scientific request I am aware of. She contacted almost all major players of the world in the field (and I am very thankful to her for including me in this list) asking to repeat the calculation, while protecting the original information. Of course some never bothered to answer the request, but I did and some others too. Sandra´s results are published here . It contains a different proof of the phenomenon. Later Marcel Sluiter and Prof. Kawazoe published two, more fundamental, proofs in Phys. Rev. B, here and here.
Unfortunatelly Sandra´s paper got so long to get published that I could not quote it in my own paper. I took care of explicitly stating her primacy in the discovery at the acknowledgements section.
After all this experience I got convinced that the scientific world is composed by three kinds of people:
- the graduate students, who blindly believe in all results they get,
- the supervisors, who believe that everything the gradutate students do should be, at least, strongly questioned,
- and Suzana Fries, who, regardless of believing or not, try to check if there is some truth, even if she needs to move the whole world to achieve this goal :-).
Saturday, March 31, 2007
Brazil can be considered a newcomer in science. The particularities of the Portuguese model of colonization resulted , for example , in the foundation of the first "university institution" only in the XIX th century (a school of medicine in Salvador, Bahia). My own institution, the "Escola Politécnica de São Paulo" is considered one of the oldest engineering schools in the country, being founded only in 1894. The creation of the University of São Paulo, the leading university in the country, dates from 1934. This, together with the agrarian roots of the country resulted in the critical lack of specialized personal at the beginning of the industrialization, in the 1950's.
This was attacked by the governments with the foundation of grant agencies (CNPq by the federal government and the FAPESP, by the São Paulo State government),which started huge programs of grants to master and doctor studies. The lack of specialized was so critical that most of these new masters and doctors was absorbed by newly founded universities and not by the industries. The industries, on the other side, were either multinational corporations or family business and both, in most cases, were not interested in the specialization of their workers. The need for technological improvement in the industry was also damped by disastrous protectionist policies adopted specially by the military regime between 1964 and the mid 1970's.
Nowadays the situation is different. The new formed masters and doctors cannot be absorbed by universities and research centers and usually spend long times in post-doc positions, depending on official grants. In the industries, on the other side, the growth of unemployment rates lead their engineers and technicians to search the university looking for a master or doctor diploma in the hope of becoming protected. Three quarters of my master students, for example, work in the industry. This should be good news, apparently. I, for example, select the the themes of the master dissertations asking to the student about specific problems which could be solved at their work. My hope is, that doing so, I am contributing to a technology transfer to their workplaces. Unfortunately this does not happen. It is a common practice of the brazilian industries to ignore the efforts of their workers, disregarding technologies which would lead to productivity enhancement. I blame the above described history for this.
In my opinion this situation require a corrective action. The leaders at the industry should learn that working with the university is not only desirable, but also necessary for maintenance of their markets. The recent devaluation of the dollar against the brazilian real will prove fatal for technologically obsolete industries. We, the universities, are ready for this dialog. The next move belongs to the industrial partners.
Saturday, March 17, 2007
This process has the advantage of avoiding the publication of bad manuscripts, without producing bad feelings in the science community. Usually it works fine, but being myself author of several manuscripts and of referee reports about other authors' manuscripts, I detected several common 'errors' of the peer reviewing process, which I will list below. My intent is not blaming someone, I did myself most of these errors. I just want to start a discussion about this matter, which I consider quite important in the actual scientific world.
Peer review 'errors':
- Most referees (specially from English speaking countries) confuse their tasks with the one of a spellchecker, pointing at interminable lists of spell and grammar errors in the manuscript. Many times this is quite useful for other authors like me, who do not come from English speaking countries, but this should not be the main concern of a referee. He (she) should simply refuse a badly written manuscript or require more spellchecking before publication. I also observed that some referees point 'errors' which are actually a matter of writing stile. The author of the manuscript should be allowed to write his manuscript using his (her) own stile, provided it conforms with the standard of the language.
- Most referees fall under a strong temptation: finding something, at any cost, to criticize in the manuscript. It should be possible to find some submitted manuscript which is already ready for publication without interference of the referee. A good referee should admit this possibility before reading the manuscript and I am not meaning only those written by famous authors.
- When requiring mandatory changes in the manuscript, the referee should consider if what he (she) is requiring is feasible. I received reports about my own manuscripts requiring absurd providences which actually would inviabilize its publication. Usually withdrawing the submission and resubmitting to another magazine 'solves' the problem (simply due to the change of the referee).
- As there are good 'a priori' manuscripts, there are also bad ones. A referee should not fall under the temptation of accepting the manuscript at any cost, fearing to hurt the feelings of the author. One should, however, take care of not confusing his (her) opinion about what is wrong or right (specially what is or what is not modern) in science with the scientific value of the manuscript itself. This issue should be moderated by the editor , who should not restrict his (her) task concerning to a manuscript to forwarding it to the referee.
Cláudio G. Schön
My intent here, as the title suggests, is to present and to discuss my opinion about Science and Technology. This includes higher education, since I am a university associate professor (at the Department of Metallurgical and Materials Engineering of the Escola Politécnica da Universidade de São Paulo) and Politics, which affects all of the former.
Have a nice reading!
Cláudio Geraldo Schön