angle strain是由于分子中某相邻键的角度与该类正常键的键角相差很大引起的。例如环丙烷C-C-C的夹角为60度，这与饱和烃中C-C-Csp3键角109.5度相差很大，所以不稳定。一般说成，由于存在angle strain，因此环丙烷有开环的倾向，易于开环来释放angle strain.torsional strain是由于重叠式构象带来的空间...
angle strain是由于分子中某相邻键的角度与该类正常键的键角相差很大引起的.例如环丙烷C-C-C的夹角为60度,这与饱和烃中C-C-Csp3键角109.5度相差很大,所以不稳定.一般说成,由于存在angle strain,因此环丙烷有开环的倾...结果一 题目 angle strain,torsional strain和steric strain之间有什么区别呀? 答案 angle...
答案解析 查看更多优质解析 举报 angle strain是由于分子中某相邻键的角度与该类正常键的键角相差很大引起的.例如环丙烷C-C-C的夹角为60度,这与饱和烃中C-C-Csp3键角109.5度相差很大,所以不稳定.一般说成,由于存在angle strain,因此环丙烷有开环的倾... 解析看不懂?免费查看同类题视频解析查看解答 ...
辉瑞研究人员将内部分子库碎片化,拆成保留torsional特征的最小片段。 从中挑一部分最常见的片段,先用MM方法找出不同torsion angle的构象,然后对这些构象依次用QM方法 (B3LYP/6-31G**) 算对应的能量,这一步计算量大,放在亚马逊云上进行。 把这些数据来“喂”给AI,建模用到两种方法,随机森林及DNN (Deep Neural N...
The torsional stress and strain can be calculated from torque and angle of twist with the help of torsional equation. The expression of torsional...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our...
Band-gap change of carbon nanotubes: Effect of small uniaxial and torsional strain We use a simple picture based on the pi electron approximation to study the band-gap variation of carbon nanotubes with uniaxial and torsional strain. We f... L Yang,MP Anantram,J Han,... - 《Physical Revi...
The torsional constant is the property that allows us to calculate the angle of twist of non-circular bars: ϕ=TLKGϕ=KGTL In this equation: ϕϕ— Angle of twist; TT — Torque applied to the beam; LL— Shaft length; GG— Shear modulus of the shaft material; and KK— Beam ...
Here, the dimensionless torsional strain is defined as 𝜀𝑡=𝜑𝐷0/𝑙0εt=φD0/l0, with 𝐷0D0 and 𝑙0l0 as the equivalent diameter and length of the sample, and 𝜑φ as the twist angle. n is the filament number, m is the mass of each filament. The tensile strain se...
4. Which sensor to use? There are many sensor options to measure torsional vibration (accelerometers, strain gauges, optical sensors, magnetic pickups, incremental encoders, etc.). Two common sensors used to measure torsional vibration are magnetic pickups or optical encoders (in conjunction with ...
周国锋;李晓延;史耀武;徐滨士.Three-dimensional finite element analysis of critical pre-twist strain angle for torsional axis.Journal of Central South University of Technology(English Edition).2005周国锋,李晓延,史耀武,徐滨士.Three-dimensional finite element analysis of critical pre-twist strain angle for ...