跨学科研究成果初探

本文具体剖析了跨学科研究的某些主要特点，对何谓跨学科研究成果及跨学科研究成果的分类问题进行了探讨。     

碳／碳复合材料的氧化及其防护

研究了碳/碳复合材料的氧化机理及抗氧化防护方法.对基体改性及涂层法进行了详细评述,对碳/碳复合材料抗氧化的研究现状进行了综述,阐明了其发展的方向.     

贵阳中心区土壤碳密度和碳储量分布特征

利用贵州省多目标区域地球化学调查(贵阳中心区)(1∶250000)成果,对贵阳中心区土壤碳密度和碳储量分布特征进行了研究,主要取得如下成果:(1)贵阳中心区表层、中层和深层土壤全碳密度平均值分别0.68×10~4t/km~2、2.22×10~4t/km~2、3.15×10~4t/km~2,高于四川、湖南等其他省区,全碳储量分别为0.16×10~9t、0.53×10~9t、0.76×10~9t;(2)研究区土壤有机碳密度较高,有机碳储量占全碳储量约90%,表明有机碳极为丰富,土地较肥沃,适宜于农业生产;(3)土壤有机碳密度随土壤类型、土地利用方式及生态系统的不同而存在一定差异;(4)区内(0~1.8 m)无机碳密度平均值为0.31×10~4t/km~2,无机碳储量为0.08×10~9t,仅占总碳量的10%.研究成果可为碳循环研究、生态环境影响和农业生产提供科学依据.     

碳还原氧化铜实验的探讨

碳还原氧化铜实验的探讨安徽省肥东一中李克森在做初中化学Ｈ２，Ｃ和ＣＯ还原氧化铜的三个实验中，难度较大的要算碳还原氧化钢了。针对这个实验，我们在选择无定形碳的种类、温度、装置及碳与氧化铜的质量比等方面进行了精心的探讨，得到该实验最佳效果的适宜条件。现将...     

碳的第三种单质——C60及全碳分子

碳的第三种单质—Ｃ６０及全碳分子黄尚毅段巨龙长期以来，人们知道碳元素只有两种单质，金刚石和石墨。但是，现在发现了碳元素单质家庭中的第三位成员，即以碳—６０（Ｃ６０）为代表的全碳分子系列物质。Ｃ６０及全碳分子的出现不仅在理论上意义非凡，而且是有极其广泛...     

S25C与SUS405钢真空扩散焊接头性能

研究了Ｓ２５Ｃ与ＳＵＳ４０５钢的真空扩散焊接的变形率、抗拉强度及硬度．金相及显微分析可见，在焊接接头的结合界面上，Ｓ２５Ｃ钢一侧存在脱碳层，ＳＵＳ４０５钢一侧存在增碳层，这是造成接头组织分布及硬度分布不均匀的主要原因．还采用电子探针进行了微区分析，研究了碳、铬元素的分布．     

碳正离子——一种有机化学反应中的活性中间体

碳正离子是有机化学反应中常见的重要活性中间体，它的生成、结构、稳定性等对某些有机化学反应历程的阐明及反应产物的预测是十分重要的。本文对碳正离子的生成、结构、稳定性、类型及反应进行了阐述。     

碳碳双键和叁键加成差异的探讨

碳碳双键和叁键都能进行加成反应，加成反应活性差异很大，笔者从两者的结构入手，应用电负性，电离能，碳离子稳定性，电子屏弊效应探讨了二者的加成差异。     

快乐体育教学模式述评

在前人研究成果的基础上，对快乐体育的内涵及快乐体育教学模式的基本特征及优缺点等进行了综合分析与评述．     

其他星球也有生命存在的可能

美国宇航局的科学家最新研究证明，宇宙间星际尘埃中含有140多种不同的化合物和分子，它们大多数都含有构成生命的基本物质——碳.他们的这一研究成果已经刊发在欧洲有关媒体上．当代科学理论普遍认为，碳是生命诞生和存在所必需的最基本的物质，至少地球上存在的所有生命都无一例外.传统的进化理论认为，地球生命起源于最早形成的有机碳水化合物分子，而这些最早的碳水化合物分子产生于强大的闪电电荷与地球发展早期阶段的水的相互作用.美国宇航局的科学家们在宇宙空间发现复杂的碳化物对生命起源问题提出了新挑战，这将势必引发宇宙间其它…     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

不同的吃喝玩乐

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/     

漏洞百出的教育

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?     

只要努力,不要后悔

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.     

浅谈移民问题

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.     

Sister Carrie, an Adherent of Desires

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.     

Improvement of one-cycle controller by use of proportional integral differential controller

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

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.