Chapter 42: Examination month (below)

　　 In the third week, continue to explore the experimental conditions.
　　 There are only two variables this time: the content of solvent additives and the speed.
　　 Xu Qiu designed experimental conditions:
The volume fractions of 　　 are 0.4%, 0.7%, 1%, 1.3%, and 1.6%, in five groups.
The speed of 　　 is 2000, 2200, 2500, 2800r.p.m., a total of four groups.
　　Other conditions are chlorobenzene solvent, solution concentration of 20 mg/ml, donor-acceptor mass ratio of 1:1.3, and no annealing operation.
　　 a total of 20 sets of conditions.
　　 spin coating, evaporation, testing.
　　Finally, the highest efficiency of "0.7%, 2200" samples was achieved, reaching 10.68%.
　　 Xu Qiu is quite satisfied with this result. Although he continues to fine-tune the experimental conditions, there is still room for improvement in efficiency, but there is not much need.
　　 After all, this is just a benchmark system, and it should be able to reach an average level similar to that of other researchers.
　　 If it is a new material synthesized by itself, it is necessary to rush the efficiency and test its performance limit.
　　 On Sunday, Xu Qiu went to the laboratory again.
　　 "Xu Qiu, my efficiency is 9.6%, and I will be 10% soon." Chen Wanqing said happily when they met.
　　 "Congratulations, senior sister." Xu Qiu said.
　　 It seems that there is no need to continue to remind the elder sister. This system only needs to know the two key points of hot coating and solvent additives. The general direction is well grasped, and a few more batches of devices can always reach 10%.
　　 "Senior sister, how is your article, have you voted it out?" Xu Qiu asked.
　　 "Not yet, I have basically written everything, and now there is a lack of data." Chen Wanqing said.
　　 "What data is missing, can't it be tested directly?" Xu Qiu said.
"　　" is the grazing X-ray diffraction experiment I told you before. It needs to be tested at the Magic City Synchrotron Radiation Center, or the Magic City Light Source.
　　 When testing over there, you need to make an appointment in advance. Because scientific researchers from all over the country will come to test, the time is very tight, and the time is arranged by Magic Light Source.
　　 Our next test time is two weeks later, so we have to wait two weeks to test this data before posting the article. "Chen Wanqing said.
　　 "Well, what about Wu Feifei and Duan Yun's articles?" Xu Qiu said.
　　"Wu Feifei's review has been voted out. Teacher Wei voted for EES, EnergyEnviron.Sci., I didn't expect him to be so fierce.
　　Generally, the reviews of such big journals are by appointment. I don't know if he has found a journal editor, but I read Feifei Wu's article and I can write it.
　　 In the past few days, Teacher Wei is helping to revise Duan Yun's essay, and he will start to revise mine after his submission. "Chen Wanqing said.
　　 "EES, isn't that one of the first three reviews you gave me? I remember the impact factor is more than 30." Xu Qiu said.
　　 "Yes, it can be regarded as the top journal in the material field, and then the next big and small journals of the "Nature" series." Chen Wanqing said:
　　 "Wu Feifei's scientific research ability is still good. I also posted a Chem.Mater., and now it has been cited more than 80 times. Teacher Wei regrets that he was too cautious when he invested."
　　 "So he made a big move this time." Xu Qiu said.
　　 "Who knows, maybe it's really a hit. You must let Feifei Wu treat at that time," Chen Wanqing said:
　　 "When we post articles, Teacher Wei will give cash rewards, usually the journal impact factor is multiplied by 200 yuan, and if it is reviewed, it will be halved."
　　 "That's a lot, if it is published, it will cost 3,000 yuan." Xu Qiu said.
　　 "Alright, the money is from Teacher Wei, so I won't give too much, but like some research institutes, for example, my classmates went to the Magic Capital Institute, and the rewards for posting articles were much richer.
　　 The reward for posting articles there is that the square of the impact factor is multiplied by 500 yuan, and the research institute pays the money, but posting articles there is more difficult. "Chen Wanqing said.
　　 "That published an article of "Nature", but it was more than 800,000 yuan." Xu Qiu said in his heart.
　　 "Yes, although there may be only 200,000 left for a work, but it is quite a lot," Chen Wanqing said:
　　 "However, 200,000 people who can post "Nature" may not appreciate it. Most university professors will not be able to produce one for a lifetime of research."
　　…………
　　 The fourth week, the exam month is almost over.
　　 "Material Preparation and Processing" examination room.
　　 Xu Qiu got the test paper, and first looked through it as a whole.
　　 10 noun explanations, 10 points.
　　 10 true or false questions, 10 points.
　　 5 short answer questions, 30 minutes.
　　 4 comprehensive questions, 40 points.
　　 1 calculation question, 10 points.
　　 There is an additional question, "Please write down suggestions for this course.", 5 points.
　　 should be to give the students some welfare points.
　　 After confirming that there is no missing text in the test paper, Xu Qiu started to answer the questions quickly.
　　 The test lasted for two hours, but after one and a half hours, candidates started to hand in papers one after another.
　　 Xu Qiu was not in a hurry to hand in the paper, and dragged it to the last minute.
　　 He had a short answer question that he didn't review, so he had to write a bunch of words based on his own understanding, and he didn't know if he got it right.
　　…………
　　 After the exam, Tao Yan offered a treat and went out for lunch. Xu Qiu and Ren Bin naturally had no reason to refuse.
　　Tao Yan chose a sizzling grill restaurant and came to the shop. He skillfully picked up the menu and ordered chicken thighs, beef short ribs, pork belly, bacon, mushroom platter, sizzling tofu and other ingredients.
　　"Tao Yan, why suddenly call us two to eat~EbookFREE.me~Ren Bin said.
　　 "Do you still need a reason to entertain guests?" Tao Yan said: "Well, mainly after the exam, I feel that my grades are good this semester, and there should be no problem with the postgraduate program."
　　 "I’m so confident before I get my grades," Ren Bin said, "Let’s talk about it, estimate the score."
　　 "Conservatively estimate 3.8, this semester will choose the courses in the Department of Materials, it is easier to get good grades." Tao Yan said.
　　 "I, 3.8!" Ren Bin exclaimed: "Xu Qiu, how about you?"
　　 "I guess it's 3.6. There are two courses outside the department. The GPA should not change much this semester." Xu Qiu thought for a while.
　　 "Hey, I can burn a high incense after a 2.5." Ren Bin sighed.
　　 "You, I still think of a way to pass a few compulsory courses, and the grade point is more than 2.0." Tao Yan said.
　　 "That's what I said." Ren Bin said.
　　 "By the way, Xu Qiu, I will enter the laboratory next semester, do you have any suggestions?" Tao Yan said.
　　 "Then it depends on your future plans. Do you plan to do scientific research all the time, or go for a master's degree and leave." Xu Qiu said.
　　 "Get a master's degree, my postgraduate study is mainly based on the family's request. They said that if I can't hold the postgraduate course, they will let me go for the postgraduate entrance examination." Tao Yan said.
　　 "No wonder you have been so desperately reviewing this semester. It is not so easy for our school to enter the postgraduate entrance examination," Xu Qiu said:
"Speaking of the topic, if you only have a master's degree, you can find some teachers who have cooperated with industry, such as the field of material failure analysis done by Li Xiaobin, or the field of semiconductor packaging done by Huo Xujun. There should be other teachers. You can go to the official website of the Department of Materials Take a look.
　　 Such tutors are not under great research pressure, and they may be directly promoted after graduation. "