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Investment casting process design — wax pattern, ceramic shell build, dewaxing, burnout, casting, shell thickness, Chvorinov's rule, riser design, gating, solidification, dimensional tolerances, surface finish, ASTM B557/A571, aerospace/turbine blade…
原文语言：英语
J-integral fracture mechanics — elastic-plastic fracture, ASTM E1820 J-R curve, η-factor method, validity requirements, J_IC to K_IC conversion, crack tip opening displacement (CTOD), ductile tearing, constraint effects (T-stress, Q-factor), piping flaw…
原文语言：英语
Jet engine thermodynamics — turbojet/turbofan Brayton cycle, SFC, overall efficiency, fan/compressor/turbine work, bypass ratio, component efficiencies, inlet recovery, afterburner.
原文语言：英语
Jet impingement cooling for electronics and high-flux applications — confined single-phase liquid, submerged jets, micro-jet arrays, two-phase (boiling) impingement, CHF (critical heat flux), thermal resistance networks, Intel/IBM chip cooling, datacenter…
原文语言：英语
Jet impingement heat transfer — stagnation Nusselt number, Martin correlation, H/D ratio, array impingement, spent flow management, crossflow degradation, confined vs. unconfined, turbine blade leading edge impingement, ANSYS CFD validation, pressure drop,…
原文语言：英语
Joint replacement biomechanics — total hip arthroplasty (THA), total knee arthroplasty (TKA), bearing couple selection, wear mechanisms, instability and dislocation, tibial tray fixation, patellofemoral mechanics, revision arthroplasty, ASTM F2996/F3141, FDA…
原文语言：英语
Jominy end-quench hardenability test — ASTM A255/E18 procedure, specimen geometry, hardness traverse, H-band steels, ideal critical diameter DI, Grossmann multiplying factors, Jominy distance to DI conversion, SAE H-band steel selection, alloy effect on…
原文语言：英语
Kalman filter for mechanical engineering — linear KF derivation, process/measurement noise covariance Q/R, state estimation, Extended KF (EKF), Unscented KF (UKF), sensor fusion (IMU + GPS + encoder), vibration state estimation, structural health monitoring,…
原文语言：英语
Keyway and spline design — key types, key stress (shear/bearing), ANSI key dimensions, spline profiles (involute/straight-sided), torque capacity, hub-shaft fit.
原文语言：英语
Labyrinth seal design — leakage flow analysis, Carry-Martin equation, tooth geometry, clearance, pressure drop per tooth, straight/stepped/interlocked configurations, honeycomb stator interaction, rotordynamic effects, gas turbine applications, ASME PTC 19.1…
原文语言：英语
Aircraft landing gear design — tricycle vs. tailwheel, load cases (FAR/CS-25), oleo strut sizing, brake energy, shimmy, retraction kinematics, tire selection, weight estimation.
原文语言：英语
Laser cutting process design — CO₂ vs. fiber laser, kerf width, cutting speed, assist gas, power density, material-specific parameters (steel/aluminum/stainless/CFRP), heat-affected zone, edge quality, dimensional tolerance, nesting optimization, ISO 9013 cut…
原文语言：英语
Laser peening (laser shock peening, LSP) — plasma pressure pulse, Hugoniot elastic limit, compressive residual stress depth, comparison to shot peening, process parameters (fluence, spot size, overlay, water confinement), fatigue life improvement, FOD…
原文语言：英语
Laser beam welding — keyhole vs. conduction mode, power density threshold, weld geometry (aspect ratio, penetration depth), Rosenthal solution, HAZ, hot cracking, porosity prevention, fiber/CO₂/disk laser selection, filler wire, dissimilar metal welding, AWS…
原文语言：英语
Leaf spring design — semi-elliptic, quarter-elliptic, multi-leaf, stress and deflection formulas, progressive rate, interleaf friction, fatigue, SAE standards.
原文语言：英语
Leak testing — methods (pressure/vacuum decay, helium mass spectrometer, bubble, tracer gas, ultrasonic), leak rate units (Pa·m³/s, scc/s, mbar·l/s), sensitivity comparison, ASTM/ISO standards.
原文语言：英语
Lean manufacturing — Toyota Production System (TPS), 8 wastes (DOWNTIME), value stream mapping (VSM), pull systems and kanban, one-piece flow vs. batch production, OEE (Overall Equipment Effectiveness), 5S methodology, SMED (Single Minute Exchange of Die),…
原文语言：英语
Large Eddy Simulation (LES) — turbulence modeling theory, Smagorinsky model, dynamic Smagorinsky, wall models (WMLES), numerical schemes (implicit/explicit), filter width, grid requirements, subgrid-scale stress, LES vs. DNS vs. RANS, bluff body flows,…
原文语言：英语
Life cycle assessment (LCA) — ISO 14040/14044, system boundary, functional unit, inventory analysis, impact categories (GWP, AP, EP), carbon footprint, eco-design, EPD.
原文语言：英语
Lightweight design strategies — topology optimization (SIMP method), material efficiency index, density-strength-stiffness trade-offs, multi-material design, AHSS/aluminum/CFRP/magnesium selection, tailored blanks, hollow sections, lattice structures,…
原文语言：英语
Plastic limit analysis — lower and upper bound theorems, yield line theory (slabs), collapse mechanisms, virtual work method, interaction diagrams (M-N-V), shakedown analysis, progressive collapse, ASME VIII plastic design rules, Drucker-Prager yield…
原文语言：英语
Lip seal (radial shaft seal) design — RWSSD selection, shaft speed limits, lip contact pressure, housing/shaft tolerances, materials (NBR/FKM/PTFE), failure modes.
原文语言：英语
Lithium-ion battery engineering — electrochemical fundamentals (half-cell reactions, Nernst equation, Butler-Volmer kinetics), cell chemistry (LCO/LFP/NMC/NCA/LTO cathodes, graphite anode), cell formats (cylindrical 18650/21700, pouch, prismatic), C-rate and…
原文语言：英语
LNG (liquefied natural gas) systems — liquefaction cycles (SMR, C3MR, DMR, AP-X), cryogenic equipment, BOG (boil-off gas) management, storage tank design (full containment), rollover prevention, NFPA 59A, ISO 28460, regasification, cold flow properties,…
原文语言：英语
Locking mechanisms — thread locking (friction, mechanical, chemical/Loctite), prevailing torque nuts, castle nuts/cotter pins, self-locking thread forms (Spiralock), wedge locking, vibration testing (NAS 3350 junker test), retaining rings, spring clips, snap…
原文语言：英语
Layer of Protection Analysis (LOPA) — initiating event frequency, consequence severity, independent protection layers (IPL), probability of failure on demand (PFD), SIL determination, CCPS guidelines, LOPA worksheets, SIS design (IEC 61511), risk reduction…
原文语言：英语
Linear Quadratic Regulator (LQR) control design — state space formulation, Riccati equation, Q and R weighting matrices, closed-loop pole placement, robustness margins, integral augmentation, LQI (LQR with integral), observer design (LQE/Kalman), output…
原文语言：英语
Lubricant selection — viscosity grading (ISO VG, SAE), viscosity index, mineral vs. synthetic (PAO, ester, polyglycol), additive packages (AW, EP, DI), application matching (gears/bearings/engines/compressors), operating temperature range, compatibility,…
原文语言：英语
Lubrication system design — pressure-fed, splash, oil mist, centralized grease systems, pump selection (gear/vane/screw), filter sizing, heat exchanger (oil cooler), sump design, oil flow rates, API 614 lube console, bearing oil supply requirements, condition…
原文语言：英语
Lubrication theory and tribology — Reynolds equation derivation and solutions (journal bearing, slider bearing, squeeze film), Sommerfeld number, minimum film thickness (Ocvirk, Sommerfeld solutions), elasto-hydrodynamic lubrication (EHL) film thickness…
原文语言：英语
Machine learning for engineering — regression/classification for property prediction, neural networks, physics-informed ML (PINN), surrogate models, Gaussian process, materials informatics, process optimization.
原文语言：英语
Machinery condition monitoring — vibration analysis (FFT, envelope, cepstrum), bearing fault frequencies (BPFO/BPFI/BSF/FTF), ISO 10816 severity criteria, oil analysis, thermography, ultrasound, motor current analysis (MCSA), alarm levels, online monitoring…
原文语言：英语
Machining economics — Taylor's tool life equation, minimum cost cutting speed, maximum production rate speed, tool cost per edge, economic tool life, cycle time, machine hourly rate, setup cost, scrap cost, total cost per part, process selection economics,…
原文语言：英语
Machining parameters — cutting speed, feed, depth of cut, power, surface finish, tool life (Taylor's equation), turning/milling/drilling/grinding. Material-specific recommendations.
原文语言：英语
Active magnetic bearing (AMB) design — electromagnetic force, bias flux, control current, position stiffness (negative), current stiffness, PID/LQR control, rotor dynamics (critical speed, stability), auxiliary (backup) bearings, ISO 14839, API 617 AMB, power…
原文语言：英语
Magnetic particle inspection (MPI/MT) — magnetization methods (circular/longitudinal, AC/HWDC/FWDC), flux density requirements (B=1.5-2.5T for ferromagnetic), current level selection (π×D×800 A/m rule), wet vs dry particles, fluorescent vs visible,…
原文语言：英语
Magnetostrictive materials and devices — Joule magnetostriction, Terfenol-D properties, actuator design (bias magnet, prestress, power density), magnetostrictive position sensors (Temposonics), linear variable differential transformer (LVDT) comparison,…
原文语言：英语
Maintainability engineering — MTTR prediction (MIL-HDBK-472, Procedure V), maintenance task analysis (MTA), level of repair analysis (LORA), built-in test (BIT/BITE), LRU/SRU design, maintenance manhours per flight hour (MMH/FH), operational availability…
原文语言：英语
Marine inspection — hull surveys (class, flag state, PSC), thickness gauging (UT), coating condition, corrosion allowance, ABS/DNV/Lloyd's classification, IACS common structural rules (CSR), close-up survey requirements, SOLAS Chapter II-1, condition…
原文语言：英语
Masonry structural design — compressive strength f'm (from unit + mortar per TMS 402), allowable stress vs. strength design, unreinforced masonry (URM) axial and flexural design, reinforced masonry beam and wall, slender wall design (P-delta, moment…
原文语言：英语