24小时热门版块排行榜    

查看: 722  |  回复: 4
当前只显示满足指定条件的回帖,点击这里查看本话题的所有回帖

wu砰然心动

银虫 (小有名气)

[求助] 请教MS软件大神 已有1人参与

图中划线的两个选项有什么区别啊。这是在MS中固定原子时弹出的对话框。

请教MS软件大神
1.png
回复此楼
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

wu砰然心动

银虫 (小有名气)

引用回帖:
2楼: Originally posted by Liffighting at 2017-03-21 08:25:22
一个笛卡尔坐标,一个分数坐标

这个我知道,就是具体在建模中会有什么效果。

发自小木虫Android客户端
4楼2017-03-21 12:44:03
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
查看全部 5 个回答

Liffighting

木虫 (初入文坛)

一个笛卡尔坐标,一个分数坐标

发自小木虫Android客户端
2楼2017-03-21 08:25:22
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

月只蓝

主管区长 (职业作家)

【答案】应助回帖

★ ★ ★ ★ ★ ★
感谢参与,应助指数 +1
wu砰然心动: 金币+6, ★★★★★最佳答案 2017-03-25 15:39:41
In lattices, atom positions may be described using two different coordinate systems, Cartesian or fractional.

Cartesian coordinates are defined in the usual way using 3 orthogonal unit vectors i, j and k.

In Materials Studio, Cartesian coordinates are used to describe the positions of objects in nonperiodic structures and the absolute positions of objects in a lattice.

Fractional coordinates are used to describe the positions of objects in a lattice relative to the unit cell. For crystals they are defined in terms of the lattice vectors a, b and c. For surfaces they are defined in terms of u and v and a third vector w which is a unit vector normal to both u and v.

Fractional coordinates indicate where objects are in the unit cell. For example, in a crystal an atom lying at (0.5,0.5,0.5) in fractional coordinates will be directly in the middle of the unit cell.

In a surface an atom lying at (0.5,0.5,0.5) in fractional coordinates will be 0.5 Å from the surface plane directly above the middle of the unit cell. Likewise a second atom lying at (0.5,0.5,4.5) in fractional coordinates will be 4.5 Å from the surface plane directly above the middle of the unit cell, and will have no periodic relationship to the first.
MATLAB、MS小问题、普通问题请发帖求助!时间精力有限,恕不接受无偿私信求助。
3楼2017-03-21 11:14:52
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

wu砰然心动

银虫 (小有名气)

引用回帖:
3楼: Originally posted by 月只蓝 at 2017-03-21 11:14:52
In lattices, atom positions may be described using two different coordinate systems, Cartesian or fractional.

Cartesian coordinates are defined in the usual way using 3 orthogonal unit vectors i,  ...

懂了,谢谢回复

发自小木虫Android客户端
5楼2017-03-21 12:47:38
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
信息提示
请填处理意见