VR2R-0304
① SA Source
- Source: 開啟完整 SA 文章
- Section:
PCB vs Flyover Cables - Line hint:
274
Context Before
Conductor loss is driven by copper surface roughness. As signals travel down the copper traces in the PCB, energy is lost due to the resistance in copper.
Evidence
At higher frequencies, the signal traveling through the copper crowds toward the surface of the trace, which is known as the skin effect.
Context After
On top of the natural resistance of copper, if the surface is rough, the current will not travel along a uniform path incurring more resistance and loss.
② Atomic Claim
在更高頻率下，signal 在 copper 中傳輸時會往 trace 表面集中，這種現象稱為 skin effect。
- Epistemic Mode:
ASSERTED - Mapping Status:
PARTIAL
③ Semantic Frame
{
"frame_type": "CLAIM_ONLY",
"qualifiers": {
"condition_text": "definition claim",
"numeric_mentions": [],
"temporal_mentions": []
},
"reason": "SKIN_EFFECT_NOT_CANONICALIZED_IN_SOURCE_CLAIM",
"statement": "at higher frequencies, current crowds toward the copper-trace surface; this is the skin effect."
}④ Canonical Entity Mapping
| Role | Surface Label | Canonical Target |
|---|---|---|
| — | — | — |
⑤ Human Review
請在 Properties 逐項確認：
- 原文 → Atomic Claim 是否忠實
- Atomic Claim → Semantic Frame 是否忠實
- Canonical Entity mapping 是否正確
- Epistemic mode 是否保留原文語氣
- 最後選擇
review_action
Review state
Markdown 內文不是正式 approval。只有 Apply bridge 寫入的 Decision Ledger event 才是正式決策。