首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 62 毫秒
1.
防止石墨电极高温氧化的实验研究   总被引:2,自引:0,他引:2  
通过对石墨电极高温防氧化失重实验,对石墨电极高温防氧化机理进行了初步研究。采取向电极表面直接喷淋防氧化溶液的方法,迅速降低石墨电极表面温度,并在电极表面生成连续、均匀的防氧化膜,显著提高石墨电极高温抗氧化能力,达到降低石墨电极消耗的目的。  相似文献   

2.
固体氧化物燃料电池是一种新型、高效的能源转换装置,其具有高的发电效率、可不使用贵金属作催化剂等优点.论文采用活性炭的酸化,添加辅助催化剂,变换新型载体,改变催化剂的活性,从而制备C-催化剂.实验通过红外光谱、荧光、循环伏安法等表征手段,对催化剂的电化学性质、结构、形貌以及对乙醇电催化氧化性能进行研究.实验结果表明:无水乙醇在C/SiO_2/石墨电极上的氧化峰电流远远大于在C/石墨电极和SiO_2/石墨电极上的对应的氧化峰电流,表明该催化剂对无水乙醇的电催化活性较好.  相似文献   

3.
用电化学沉积方法制备了一种过渡金属铁氰化物——铁氰化钴膜(CoHCF)修饰石墨电极(SG),对电极特性进行了表征.在pH7.00的磷酸盐缓冲溶液中,CoHCF/SG电极对次黄嘌呤、黄嘌呤、鸟嘌呤、腺嘌呤的电化学氧化均具有催化作用,催化电流随着被催化对象浓度的增加而增大.  相似文献   

4.
使用长光程薄层电化学池(薄层厚度0.15mm),用循环伏安法及光谱电化学的光谱法和单电势跃计时吸光度法(SPS/CA),研究了肾上腺素在1.0mol/L H2SO4介质中石墨电极上电氧化反应的热力学和动力学参数。  相似文献   

5.
利用琼脂糖(agarose)将过氧化氢酶(Cat)固定在热裂解石墨电极表面,制备Cat—agarose膜修饰电极.包埋在琼脂糖中妁过氧化氢酶与电极直接传递电子,在pH6.0的缓冲溶液中可得一对可逆的氧化还原峰,式电势为-0.343V(vs SCE),这是过氧化氢酶辅基血红素Fe(Ⅲ)/Fe(Ⅱ)电对的氧化还原.其式电势随溶液的pH值增加而负移且成线性关系,直线斜率为-36.8mV/pH,说明过氧化氢酶的电子传递过程伴随有质子的转移.过氧化氢酶修饰电极.在16.5—278μmol/L的范围内,催化电流与过氧化氢浓度成线性关系.  相似文献   

6.
通过热重分析实验,研究了在高温空气气氛中覆盖在Al-Zn—Si合金表面的MgO引发剂对铝合金直接氧化生长过程的作用。结果表明:MgO能显著缩短Al-Zn—Si合金熔体直接氧化所需的孕育期及Al2O3/Al复合材料的生长时间。同时发现MgO有助于Al2O3/Al复合材料以光滑的方式进行氧化生长,形成细化胞状晶团,提高组织结构的均匀度和材料的致密度。促进Al2O3/Al复合材料生长的MgO覆盖最佳量为12mg/cm^2。  相似文献   

7.
通过对含铜钢进行高温氧化实验,发现含铜钢的氧化增重与氧化时间的关系呈抛物线规律,即含铜钢具有高温抗氧化能力,其高温氧化行为符合瓦格纳金属氧化理论.同时,通过高温实验,获得了不同温度下含铜钢氧化增重与氧化时间的关系式,关系式中系数值与含铜钢在不同温度下的高温氧化程度相关.  相似文献   

8.
受钢铁行业整体低迷、石墨电极行业去产能影响等多重影响,石墨电极价格在2016年之前的这几年一直持续低迷,但自2016年1 1月中旬价格触底以来,短时间内石墨电极价格上涨幅度十分惊人.据相关数据显示,截至5月2日,石墨电极备品种近一个月涨幅超过35%,年内涨幅超过60%. 石墨电极价格的持续上涨,对于行业龙头公司而言着实构成利好.方大炭素(600516)是国内最大的石墨电极生产企业,其50%的销售收入均来自于石墨电极.据测算,石墨电极价格每上涨1000元/吨,方大炭素的净利润将增厚1.1-1.2亿元.在预期价格持续上涨的背景下,方大炭素业绩将十分优异,其值得投资者重点关注.  相似文献   

9.
目前,中国石墨电极仍呈现资源紧张,价格上涨的态势,石墨电极采购困难.山东、河北、河南受环保影响的企业仍存在,除此之外多数地区企业能保证生产,但石墨电极市场资源仍表现紧张.从下游需求来看,下游电炉钢对石墨电极需求较好,钢厂实行一月一定价,现金采购的方式结算.下游金属硅询货增多,对普通石墨电极需求将有增加.  相似文献   

10.
近日石墨电极的连续涨价引发市场的关注,点燃了二级市场上石墨烯概念的行情,需要注意的是,石墨烯和石墨电极尽管名字相似,但并非完全属同一概念,不是石墨烯板块所有的公司都能生产石墨电极,投资者需分清两者的区别.  相似文献   

11.
《海外英语》2007,(5):44-45
It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,  相似文献   

12.
一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/  相似文献   

13.
《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?  相似文献   

14.
汉字倒说     
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。  相似文献   

15.
《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.  相似文献   

16.
王菲 《华章》2007,(12):273-273
Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.  相似文献   

17.
钱生钱!     
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了  相似文献   

18.
裴水妹 《华章》2007,(11):196
Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.  相似文献   

19.
20.
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号