27,049 technical terms and definitions
alloy design phase prediction, alloy design, design phase, ml nist ts, alloy design phase, design phase prediction, phase prediction
Alloy Design and Phase Prediction Introduction & Motivation Designing advanced alloys with optimized mechanical properties requires understanding phase diagrams and microstructure…
alloy junction 1952 intended overlap active regions, circle overlap area offset distance lens, collection margin alignment tolerance double duty
Align the Opposing Disks: One Margin, Doing Two Jobs at Once Step sixteen left behind a measurable gap between the emitter's actual position and its ideal mirrored target — this…
alloy junction 1952 perform aging or stabilization, arrhenius acceleration factor conditioning temperature, coffin manson fatigue cycles cure stress bond
Apply Specified Conditioning: Compressing Years Into Hours Step 38 identified a latent failure mode that only reveals itself through repeated electrical cycling, and Step 39…
alloy junction 1952 connect to the collector alloy button, bulk temperature rise cumulative lead attachment heat, local penetration depth versus whole device thermal budget
Attach the Collector Lead: A Joint Already Made Is Now at Risk Step 33 solved a one-sided thermal-safety problem: how much heat the emitter lead's own joint could tolerate before…
alloy junction 1952 connect to the emitter alloy button, solder thermal penetration depth versus junction margin, intermetallic bond strength lead attachment alloy button
Attach the Emitter Lead: Soldering Into a Material That Already Has a History Every lead-attachment step in the sister processes bonds a wire onto a pad that was put there…
alloy junction 1952 electrical mechanical connection during firing, solid state diffusion bonding nickel germanium, interdiffusion bond thickness acceptable window
Bond the Base Tab: A Solid Bonding to a Liquid, Not a Liquid to a Liquid Step twenty-three is actively regulating a liquid dissolution process at both indium disks right now, but…
alloy junction 1952 verify continuity isolation rectification transistor action, forward reverse current ratio junction rectification test, common emitter current gain base transport factor
Check the Contacted Device: Four Tests, Each Gating the Next Every inspection this series has performed so far has examined one thing at a time — a fillet angle, a resistance…
alloy junction 1952 assign the electrical grade and retain conforming devices, error propagation combined variance current gain, z score grading threshold batch gain distribution
Classify, Mark, and Release: Forty-One Steps of Variation, Resolved Into One Number Every step in this series introduced some small, real amount of uncertainty — a guard-band Step…
alloy junction 1952 locate the electrical junction depth, metallurgical versus electrical junction depth germanium, built in potential net doping crossover junction
Complete Both Junctions: The Junction Isn't Where Dissolution Stopped Step 25 fixed where each face's dissolution interface came to rest; Step 26 worked out that the acceptor…
alloy junction 1952 apply the selected resin cure or enclosure sealing process, resin cure shrinkage residual stress rigid lead, combined cure stress and bond stress superposition
Complete Package Sealing: Curing Is a One-Time, Permanent Squeeze Step 38 covered the risk of a void trapped inside resin that was already liquid; this step is about what happens…
alloy junction 1952 complete the third electrical connection, cantilever bending stress base tab bond root, safe terminal force versus interdiffusion bond thickness
Connect the Base Tab to Its Terminal: A Lever Arm on an Already-Finished Bond Steps 33 and 34 each had to worry about heat — a solder pulse melting the wrong button, a cumulative…
alloy junction 1952 regulate molten regions thermal cycle, interface velocity integral thermal profile, arrhenius temperature sensitivity penetration depth
Control Alloy Penetration: Why a Constant-Temperature Model Isn't Enough Step twenty-two's square-root-of-time law assumed a constant temperature throughout the hold, which is…
alloy junction 1952 crystal integrity device fabrication, thermal stress induced dislocation cracking, four point probe resistivity profile ingot
Cool and Inspect the Crystal: Where Step Three's Tolerance Band Gets Measured, Not Assumed Step three managed a drift it could only anticipate; this step is the first point in…
alloy junction 1952 solidify preliminary bond, thermal expansion mismatch interface stress, cooling rate window dissolution budget crack
Cool the First Assembly: A Cooling Rate Window, Not Just a Cooling Rate The tack bond step fourteen just formed is still vulnerable in two completely different ways during…
alloy junction 1952 allow recrystallization onto the original crystal, constitutional supercooling regrowth interface stability, solidus limited acceptor concentration at t final
Cool Under Controlled Conditions: Where the Alloying Clock Finally Stops For five steps running — Step 20 through Step 24 — the germanium-indium interface has only moved one…
alloy junction 1952 form indium rich liquid alloy beneath disk, diffusion limited dissolution square root time, thermal lag depth mismatch dissolution kinetics
Dissolve Germanium Locally: Approaching Step Eleven's Ceiling in Real Time Step eleven's phase-diagram equation set a hard ceiling on how much germanium a given pellet mass could…
alloy junction 1952 protect the crystal junction surfaces and connections, electric field amplification trapped void solid dielectric, partial discharge electrical treeing encapsulation void
Encapsulate or Enclose: A Trapped Void Is Worse Than an Open Gap Step 37 checked terminal separation against two independent floors — a mechanical one and an electrical one…
alloy junction 1952 reducing or protective environment, parabolic oxide growth law indium, reducing atmosphere hydrogen indium oxide reduction
Establish the Furnace Atmosphere: Protecting What Step Nine Already Won Step nine spent real effort making sure molten indium would wet this wafer's faces cleanly, and that work…
alloy junction 1952 donor concentration base resistivity, ionized impurity scattering mobility degradation, resistivity doping concentration calibration curve
Establish N-Type Doping: Hitting a Resistivity Number, Not Just a Carrier Type This step never has to resolve an uncertain compensation balance the way a zone-refined charge's…
alloy junction 1952 remove scratches disturbed crystal, subsurface lapping damage regrowth spike, irregular regrowth front local base width
Etch Machining Damage: Why a Scratch Left Here Becomes a Spike Fourteen Steps From Now Lapping in step seven made this wafer's thickness uniform at the scale a caliper can…
alloy junction 1952 incorporate acceptor impurity into the regrown germanium, retrograde solid solubility indium germanium, acceptor concentration profile versus depth regrown base
Form the P-Type Regions: A Concentration Profile, Not a Dose Step 25 answered when recrystallization stops at each face; it did not answer what concentration of acceptor…
alloy junction 1952 thickness opposing surface geometry, preston equation material removal rate lapping, wedge parallelism total thickness variation
Grind or Lap the Slices: Making Step Six's Ceiling the Same Number Everywhere on the Wafer A sawn slice doesn't have one thickness — it has a thickness that wanders across its own…
alloy junction 1952 maintain selected composition, normal freezing segregation coefficient drift, resistivity tolerance band pull schedule
Grow a Uniform Single Crystal: Fighting the Drift Normal Freezing Introduces on Its Own Nobody has to deliberately change this melt's composition during the pull — step two…
alloy junction 1952 bring both indium disks liquid state, thermal lag front back face conduction, symmetric heating melt onset synchronization
Heat the Assembled Device: Two Disks That Don't Start From the Same Place This is the step where step eleven's peak temperature finally gets reached for real, and where…
alloy junction 1952 non destructive inspection after alloying, frozen fillet contact angle wetting inspection, button volume estimate of dissolved germanium depth
Inspect the Alloyed Assembly: Reading a Closed Structure From the Outside Every inspection in this series since Step 4 has had something to look at directly — a bare crystal…
alloy junction 1952 support thin germanium piece assembly, flexural rigidity thin plate deflection wafer, fixture contact stress concentration fracture
Load the Positioning Fixture: Where Step Six's Thickness Choice Becomes a Handling Risk Step six's thickness choice was framed as a trade between wafer count and fragility — more…
alloy junction 1952 secure the element and check terminal separation, tolerance stack up and thermal expansion terminal clearance, air gap voltage withstand breakdown terminal separation
Mount and Inspect the Assembly: A New Kind of Isolation Risk Step 36 confirmed the bare device passed isolation, rectification, and transistor action on the bench, with nothing…
alloy junction 1952 check leakage gain voltage limits capacitance frequency response, junction depletion capacitance versus reverse bias, base transit time cutoff frequency base width
Perform Final Electrical Tests: A Second Number W_B Was Always Going to Set Step 36 measured current gain and closed the loop on this series' single most-tracked quantity…
alloy junction 1952 melt and partially alloy disk secure, tack firing dissolution budget thermal diffusion, firing time self limiting penetration depth
Perform the First Firing: A Tack Weld, Not the Alloying Cycle This firing shares a furnace and a melting metal with the controlled alloying cycle roughly six steps from now, but…
alloy junction 1952 remove surface material bridging junction boundaries, parasitic surface bridge parallel resistance junction, restore reverse junction resistance post alloy etch
Perform Post-Alloy Etching: Breaking a Parasitic Bridge, Not Cleaning a Surface It would be easy to mistake this step for Step 8's cleanup etch happening a second time, later…
alloy junction 1952 position first disk on one face, collector emitter lateral diffusion collection efficiency, disk placement reference origin alignment
Place the Collector Disk: Why It Goes On Larger, and Why It Goes On First RCA's documented example placed a collector disk measurably larger than the emitter disk that would later…
alloy junction 1952 position second disk opposite face, blind placement mirrored target fixture flip, compounded placement error root sum square
Place the Emitter Disk: Placing Blind Against a Reference You Cannot See The collector went on a face anyone could watch directly; the emitter goes on the opposite face of…
alloy junction 1952 contact exposed n type germanium, ohmic contact schottky barrier work function, base tab keep out zone junction exclusion
Position the Base Tab: The One Contact That Isn't Supposed to Form a Junction Every metal this process has placed on the wafer so far was chosen specifically to dissolve germanium…
alloy junction 1952 prepare high purity germanium, recombination center minority carrier lifetime, indium alloy base material purity requirement
Prepare High-Purity Germanium: Why Recombination Centers, Not Just Donor Atoms, Set the Purity Bar This is the first of forty-two steps describing RCA's 1952 staged alloy-junction…
alloy junction 1952 control purity mass dimensions surface condition, solidus liquidus indium germanium phase diagram, pellet mass germanium dissolution budget
Prepare Indium Disks or Pellets: The Solvent Is the Dopant, Not a Separate Addition to One Every grown-junction-style process introduces an acceptor dopant as a small, calculated…
alloy junction 1952 prevent contamination from tab or attachment materials, galvanic couple nickel germanium etch bath, faraday law galvanic etch depth contribution
Protect the Base Attachment During Etching: A Second Metal Changes the Chemistry Step 30's etch rate law, , assumed a single material sitting in the bath: germanium, dissolving…
alloy junction 1952 remove etchant processing residues, indium wetting contact angle surface energy, wetted fraction alloyed contact area
Rinse and Dry: Why This Etched Surface Has to Wet, Not Just Be Clean There is no junction anywhere in this wafer yet, so the mobile-ion drift that makes rinsing critical much…
alloy junction 1952 multi cycle fresh water rinse after etching, diffusion limited clearance of trapped rinse contaminant, geometric decay residual contamination rinse cycles
Rinse and Dry Thoroughly: Why "Thoroughly" Means Repeated, Not Longer Step 9's rinse, back in Phase 1, was clearing loose particulate off a bare slice with no electrical stakes…
alloy junction 1952 conductivity quality requirements, measurement guard band accept threshold, resistivity structural soundness combined selection
Select Usable Crystal Sections: Why the Accept Band Has to Be Narrower Than the Spec Band Step four handed over a measured resistivity curve and a structural pass/fail — this step…
alloy junction 1952 cut thin pieces single crystal, alloy junction 1952 kerf loss wafer count, slice thickness base width upper bound
Slice the Germanium: Fixing the One Number Nothing Downstream Can Ever Exceed Unlike a cut through a grown-junction ingot, nothing about where or how this crystal gets sliced…
alloy junction 1952 freeze the leftover indium germanium liquid, eutectic freeze indium germanium alloy button, shrinkage void fraction alloy button solidification
Solidify the Residual Alloy Buttons: The Same Melt, Two Different Fates Every step from 20 through 27 has followed the fraction of the indium-germanium liquid sitting directly…
alloy junction 1952 thickness usable area before pellet placement, usable area map exclusion zone wafer, placement margin pellet footprint tolerance
Verify Finished Slice Dimensions: Closing Phase One With One Gate, Not Four Separate Ones Four separate steps have each quietly set their own requirement on this wafer — step…
alloy junction 1952 establish intimate metal semiconductor contact, capillary viscous spreading time constant, young laplace pressure trapped void wetting
Wet the Germanium Faces: Reaching Equilibrium Isn't Instant Step nine established the equilibrium condition wetting needs — a clean surface the molten metal would eventually…
alloy-junction transistor process flow, alloy junction transistor device process flow, alloy junction transistor process, indium pellet alloying germanium, alloy junction base width control, alloy transistor yield control
Alloy-Junction Transistor Device Process Flow: Pellet Geometry, Soak-Time Kinetics & Furnace-Recipe Yield Control The alloy-junction transistor was the first transistor…
device physics
Alloy Scattering is the mobility-degrading mechanism specific to semiconductor alloy channels where random atom placement creates local potential fluctuations — it penalizes…
ring allreduce bandwidth optimal, recursive halving doubling, allreduce algorithm comparison, nccl allreduce implementation
AllReduce Collective Communication is the fundamental distributed operation that combines (reduces) values from all participating processes and distributes the result to every…
stanford, instruction
Stanford Alpaca is the model that started the open-source instruction-tuning revolution in March 2023 — demonstrating that fine-tuning Meta's LLaMA-7B on just 52,000…
training techniques
Alpaca is an instruction-tuned model line trained from synthetic instruction datasets derived from larger teacher models - It is a core method in modern LLM training and safety…
evaluation
AlpacaEval is an automated evaluation benchmark for instruction-following language models that uses a strong LLM as judge (typically GPT-4) to compare model outputs against…
internal testing, pre-beta test
Alpha testing is internal pre-release testing performed by development teams or selected internal users - Alpha phases focus on functional completeness defect discovery and core…