入门
在 Duaer 里查 NOMAD
在 Duaer 里：按化学式、元素和模拟程序检索 NOMAD 仓库中的材料模拟条目：计算方法、流程、程序、作者与上传日期。一次成功查询用 1 额度。
能拿到什么
Duaer 数据市场里的「NOMAD」：按化学式、元素和模拟程序检索 NOMAD 仓库中的材料模拟条目：计算方法、流程、程序、作者与上传日期。查到结果时用 1 额度，结果交给数字组织的下一个节点。
从节点创建器选 Duaer 数据 → NOMAD，或打开 数据市场。相关：JARVIS-DFT、Materials Project。
适合做什么
- 检查是否已有人发布某体系的 VASP 或 Quantum Espresso 计算。
- 查找某组成最近上传的模拟条目。
在画布里检索
- 打开节点创建器，选 Duaer 数据 → NOMAD。
- 填 Formula（如 GaN）或 Elements（如 Ga,N）；Program 可选（如 VASP）。
- Limit 默认 10，最大 20。执行。
查到结果才扣 1 额度；没有结果、输入有误或上游失败都不扣。
用 API 调用
- GET https://api.duaer.com/v1/data/nomad?formula=GaN&program=VASP
- Authorization: Bearer <Duaer key>
下方是与数据市场「复制技能」相同的英文技能，含参数、示例与返回字段。
调用技能（英文）
与数据市场「复制技能」一致。
---
name: duaer-nomad
description: >-
Duaer NOMAD. Materials simulation entries in the NOMAD repository by formula, elements, and simulation code: method, calculation type, program, author, and upload date.
One successful search uses 1 Duaer credit.
---
# Duaer NOMAD
Duaer NOMAD searches the NOMAD repository of raw and processed materials simulations (DFT and more), newest uploads first. Use it to find existing calculations before running your own.
## When to use
- Check whether someone already published a VASP or Quantum Espresso run for a system.
- Find recent simulation uploads for a composition.
## When not to use
- A curated property table. Use https://skills.duaer.com/jarvis.md or https://skills.duaer.com/materials-project.md.
- Experimental structures. Use https://skills.duaer.com/cod.md.
## Call
`GET https://api.duaer.com/v1/data/nomad?formula=GaN&program=VASP`
Header: `Authorization: Bearer <Duaer key>`
Use an account key or a model API key.
Get a Duaer key: https://skills.duaer.com/keys.md
## Parameters
Provide `formula` or `elements`.
- `formula` — Formula such as GaN. Matches the reduced formula.
- `elements` — Optional. Entries that contain all of these, such as Ga,N.
- `program` — Optional. Simulation code, such as VASP or Quantum Espresso.
- `limit` — Optional. Rows to return, from 1 to 20. Default 10.
## Examples
- `GET https://api.duaer.com/v1/data/nomad?formula=GaN&program=VASP` — GaN runs made with VASP.
- `GET https://api.duaer.com/v1/data/nomad?elements=Si,O&limit=5` — latest silicon-oxygen entries.
## Result
The response is `{ "items": [...] }`. Each item has `source`, `title`, `url`, and `summary`, plus:
- `entryId`, `uploadId` — NOMAD ids.
- `formula`, `elements`, `structuralType` — composition and bulk, surface, or molecule.
- `method`, `calculation`, `program` — such as DFT, GeometryOptimization, VASP.
- `author`, `uploaded` — origin and upload date.
- `reference` — first external reference, when present.
Fields without a value are left out.
## Credits
A search that returns at least one row uses 1 credit.
An empty search, a search that finds nothing, or a failed search uses 0.
Wrong input returns 400 with a message and uses 0.
No remaining credits returns 402 and does not search.
A missing key returns 401.
## Related
- https://skills.duaer.com/jarvis.md — Duaer JARVIS-DFT
- https://skills.duaer.com/materials-project.md — Duaer Materials Project
常见问题
Duaer 的NOMAD检索扣多少额度？
查到结果时扣 1 额度；没有结果或出错不扣。
Duaer NOMAD 结果怎么排序？
按上传时间从新到旧，最新的计算排在最前。
同组