{"query": "Electronic behaviour — bands", "count": 20, "results": [{"id": "card_mat_electronic", "title": "Electronic behaviour — bands", "shelf": "codex", "surface": "secular", "snippet": "Conductor, insulator or semiconductor is set by the electron band structure - the quantum mechanics of electrons in the periodic lattice. Silicon's gap is why the digital age exists. Rests on quantum ", "authority_tier": "engine_derived", "source": "Narrow Highway — materials science", "readable": false, "generated": false}, {"id": "card_theory_condensed_matter", "title": "Condensed matter & semiconductors (band theory and the transistor)", "shelf": "theories", "surface": "secular", "snippet": "Condensed matter & semiconductors (band theory and the transistor) — an engine domain that can touch it: materials_science. Calibration: map-only — band gaps and carrier concentrations compute; the fi", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_wave_optics", "title": "Wave optics (Huygens, Snell's law, diffraction)", "shelf": "theories", "surface": "secular", "snippet": "Wave optics (Huygens, Snell's law, diffraction) — an engine domain that can touch it: optics. Calibration: seals — refraction, lens and diffraction relations compute. Light behaves as a wave: it refra", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_electromagnetic_spectrum", "title": "The electromagnetic spectrum & modulation (radio to gamma, one axis)", "shelf": "theories", "surface": "secular", "snippet": "The electromagnetic spectrum & modulation (radio to gamma, one axis) — an engine domain that can touch it: physics. Calibration: seals — c = fλ, photon energy E = hf, and bandwidth relations all recom", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_br_nsted_lowry_acid_base_theory_ph", "title": "Brønsted–Lowry acid–base theory & pH", "shelf": "theories", "surface": "secular", "snippet": "Brønsted–Lowry acid–base theory & pH — an engine domain that can touch it: chemistry. Calibration: seals — pH, pKa and buffer calculations compute exactly. An acid DONATES a proton, a base ACCEPTS one", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_n_cdb747a427d2", "title": "Electronics — the resonant chain, from Ohm's law to the radio wave", "shelf": "science", "surface": "secular", "snippet": "One sealed chain runs the whole bench: Ohm's law (V = I·R), the capacitor's\nexponential clock (one time constant → 63.2% charged), the diode's exponential gate (current\ndoubles every ln2·nVT ≈ 17.9 mV", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}, {"id": "card_comms_handheld_vhf_uhf", "title": "VHF/UHF FM handhelds (Baofeng-class) — voice and listening, and where the license lines fall", "shelf": "communications", "surface": "secular", "snippet": "A dual-band FM handheld (the $25 Baofeng class) transmits VOICE on 136–174 MHz (2 m) and 400–520 MHz (70 cm), typically 1–5 W: a few km simplex handheld to handheld, far more through a repeater on a h", "authority_tier": "reference", "source": "FCC Part 97 — Amateur Radio Service (U.S. regulation, public domain)", "readable": false, "generated": false}, {"id": "card_comms_packet_over_handheld", "title": "Text over a handheld — packet radio (AX.25 / APRS) with a sound-card TNC", "shelf": "communications", "surface": "secular", "snippet": "A VHF handheld can carry TEXT: packet radio sends short digital frames (AX.25) as 1200-baud audio tones (AFSK) over the ordinary voice channel. The parts: the handheld, a cable to a sound-card interfa", "authority_tier": "reference", "source": "FCC Part 97 — Amateur Radio Service (U.S. regulation, public domain)", "readable": false, "generated": false}, {"id": "card_n_7b9fe7aaa620", "title": "Infrared — everything warm is broadcasting", "shelf": "science", "surface": "secular", "snippet": "Above visible red the spectrum becomes heat's own voice: every body radiates with a\npeak set by Wien's law, λ_peak·T = 2898 µm·K. Sealed: at body temperature (310 K) you glow\nbrightest at 9.3 µm — whi", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}, {"id": "card_n_3a794cd9373c", "title": "Polycarp to the Philippians I", "shelf": "patristics", "surface": "witness", "snippet": "I have greatly rejoiced with you in our Lord Jesus Christ, because ye have followed the example of true love [as displayed by God], and have accompanied, as became you, those who were bound in chains,", "authority_tier": "father", "source": "Epistle of Polycarp to the Philippians (trans. Roberts-Donaldson, 1885)", "readable": false, "generated": false}, {"id": "card_n_c39a51a03b6f", "title": "Oscillator — LC resonance, the bench's own Schumann", "shelf": "science", "surface": "secular", "snippet": "Energy sloshing between a coil and a capacitor rings at f = 1/(2π√(LC)); sealed:\n100 µH with 100 pF gives 1.591 MHz — the middle of the AM broadcast band: https://narrowhighway.com/s/1ee0d3ed486453eee", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}, {"id": "card_n_0fa594da0bff", "title": "Diode — the exponential gate", "shelf": "science", "surface": "secular", "snippet": "The diode's current grows exponentially with voltage; sealed exactly: e^(x+ln2) = 2e^x —\ncurrent DOUBLES for every ln2·nVT of forward voltage, ≈ 17.9 mV at room temperature (sealed:\nfloor(10⁴·ln2·0.02", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}, {"id": "card_src_etym_band", "title": "band", "shelf": "etymology", "surface": "secular", "snippet": "band: etymology (Webster 1913) — n.: [OE. band, bond, Icel. band; akin to G., Sw., & D. band, OHG. bant, Goth. banti, Skr. bandha a binding, bandh to bind, for bhanda, bhandh, also to E. bend, bind. I", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_n_b04a994d0276", "title": "X-rays — shadows cast by 12-picometer light", "shelf": "science", "surface": "secular", "snippet": "Sealed: a 100 keV medical X-ray photon has a wavelength of 12.3 pm — smaller than an\natom: https://narrowhighway.com/s/2e10f3cd833c0da8ed1973eeb517c9de779e8956cd7d04eeee423aab280c4455 . That is why X-", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}, {"id": "card_n_b10117556d41", "title": "The two clocks — quartz, cesium, and the second", "shelf": "science", "surface": "secular", "snippet": "The wrist clock and the world clock. Quartz beats 32,768 times a second; the SI second is\nDEFINED as 9,192,631,770 oscillations of cesium-133's hyperfine transition (since 1967) —\nsealed: the cesium c", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}, {"id": "card_src_etym_shelter", "title": "shelter", "shelf": "etymology", "surface": "secular", "snippet": "shelter: etymology (Webster 1913) — n.: [Cf. OE. scheltrun, shiltroun, schelltrome, scheldtrome, a guard, squadron, AS. scildtruma a troop of men with shields; scild shield + truma a band of men. See ", "authority_tier": "reference", "source": "Webster's Revised Unabridged Dictionary (1913), Project Gutenberg eBook #29765 — public domain", "readable": true, "generated": false}, {"id": "card_src_frd_finland", "title": "Finland: A Country Study", "shelf": "countries", "surface": "secular", "snippet": "There are two official languages in Finland, Finnish and Swed- ish. The latter language, once dominant, is now spoken as a first language by only 6 percent of Finland’s population. For this rea- son, ", "authority_tier": "reference", "source": "Finland: A Country Study — Federal Research Division, Library of Congress (1990) (public domain)", "readable": true, "generated": false}, {"id": "card_span_012e3175af88", "title": "COUNCIL-FIRE CIRCLE", "shelf": "sources", "surface": "secular", "snippet": "In every large permanent camp I establish a proper \nTouncil-fire Circle or Council Camp. The uses and \n\n\nCampercraft or the Summer Camp 183 \n\n\nbenefits of these will be seen more and more, as camp \ngo", "authority_tier": "primary_pd", "source": "The Book of Woodcraft and Indian Lore", "readable": true, "generated": false}, {"id": "card_tool_resonators", "title": "Resonators — Helmholtz, the cavity, Fabry-Perot: one shape, a Q that fades", "shelf": "codex", "surface": "secular", "snippet": "Three instruments, one shape. The HELMHOLTZ RESONATOR (1863) is a volume of air on a neck - the air in the neck is the mass, the air in the body the spring - f = (c/2 pi) sqrt(A/(V L')), the lumped li", "authority_tier": "engine_derived", "source": "Narrow Highway — the instruments", "readable": false, "generated": false}, {"id": "card_comms_meshtastic_start", "title": "Meshtastic quick-start — a node on the air in minutes", "shelf": "communications", "surface": "secular", "snippet": "1) Set your REGION on first boot (US) so it uses the legal frequency. 2) Keep the default preset 'LongFast' (long range, everyone's default) or agree one with your group. 3) Set a private CHANNEL + PS", "authority_tier": "reference", "source": "FCC Part 15 ISM band (public domain) + Meshtastic open-source project", "readable": false, "generated": false}], "house": {"door": "FIND", "kind": "cards", "trail": "results", "seal": null, "next_step": {"do": "open the top card", "door": "FIND", "tool": "card_get", "params": {"id": "card_mat_electronic"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}