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New and Modified PACS Categories for 2001New Categories02.10.Ab Logic and set theory02.10.De Algebraic structures and number theory 02.10.Hh Rings and algebras 02.10.Kn Knot theory 02.10.Ud Linear algebra 02.10.Xm Multilinear algebra 02.10.Yn Matrix theory 02.20.Bb General structures of groups 02.20.Uw Quantum groups 02.30.Ik Integrable systems 02.30.Oz Bifurcation theory (see also 47.20.Ky in fluid dynamics) 02.30.Uu Integral transforms 02.30.Vv Operational calculus 02.30.Xx Calculus of variations 02.30.Yy Control theory 02.30.Zz Inverse problems 02.40.Gh Noncommutative geometry 02.40.Tt Complex manifolds 02.40.Xx Singularity theory (see also 05.45.-a in statistical physics, thermodynamics, and nonlinear dynamical systems) 02.40.Yy Geometric mechanics (see also 45.20.Jj in formalisms in classical mechanics) 02.50.Tt Inference methods 02.70.Rr General statistical methods 02.70.Ss Quantum Monte Carlo methods 02.70.Tt Justifications or modifications of Monte Carlo methods 02.70.Uu Applications of Monte Carlo methods (see also 02.50.Ng and 05.10.Ln in statistical physics) 03.65.Ta Foundations of quantum mechanics; measurement theory 03.65.Ud Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.) 03.65.Vf Phases: geometric; dynamic or topological 03.65.Wj State reconstruction, quantum tomography 03.65.Xp Tunneling, traversal time, quantum Zeno dynamics 03.65.Yz Decoherence; open systems; quantum statistical methods 31.50.-x Potential energy surfaces (for potential energy surfaces for chemical reactions, see 82.20.Kh; for collisions, see 34.20.Mq) 31.50.Bc Potential energy surfaces for ground electronic states 31.50.Df Potential energy surfaces for excited electronic states 31.50.Gh Surface crossings, non-adiabatic couplings 39.25.+k Atom manipulation (scanning probe microscopy,lasercooling, etc.) (see also 82.37.Gk STM and AFM manipulations of a single molecule in physical chemistry and chemical physics) 47.85.-g Applied fluid mechanics 47.85.Dh Hydrodynamics, hydraulics,hydrostatics 47.85.Gj Aerodynamics 47.85.Kn Hydraulic and pneumatic machinery 47.85.Np Fluidics 52.25.Os Emission, absorption, and scattering of electromagnetic radiation 52.25.Xz Magnetized plasmas 52.27.-h Basic studies of specific kinds of plasmas 52.27.Aj Single-component, electron-positive-ion plasmas 52.27.Cm Multicomponent and negative-ion plasmas 52.27.Ep Electron-positron plasmas 52.27.Gr Strongly-coupled plasmas 52.27.Jt Nonneutral plasmas 52.27.Lw Dusty or complex plasmas; plasma crystals 52.27.Ny Relativistic plasmas 52.30.Cv Magnetohydrodynamics (including electron magnetohydrodynamics)(see also 47.65 in fluid dynamics; for MHD generators, see 52.75.Fk) 52.30.Ex Two-fluid and multi-fluid plasmas 52.30.Gz Gyrokinetics 52.35.Vd Magnetic reconnection 52.35.We Plasma vorticity 52.38.-r Laser-plasma interactions(for plasma production and heating by laser beams see 52.50.Jm) 52.38.Bv Rayleigh scattering; stimulated Brillouin and Raman scattering 52.38.Dx Laser light absorption in plasmas (collisional, parametric, etc.) 52.38.Fz Laser-induced magnetic fields in plasmas 52.38.Hb Self-focussing, channeling,and filamentation in plasmas 52.38.Kd Laser-plasma acceleration of electrons and ions (see also 41.75.Jv in electromagnetism; electron and ion optics) 52.38.Mf Laser ablation (see also 79.20.Ds in impact phenomena) 52.38.Ph X-ray, gamma-ray and particle generation 52.40.Kh Plasma sheaths 52.50.Nr Plasma heating by DC fields;ohmic heating, arcs 52.50.Qt Plasma heating by radio-frequency fields; ICR, ICP, helicons 52.50.Sw Plasma heating by microwaves; ECR, LH, collisional heating 52.55.Ip Spheromaks 52.55.Rk Power exhaust; Divertors 52.55.Tn Ideal and resistive MHD modes;kinetic modes 52.55.Wq Current drive; helicity injection 52.57.-z Laser inertial confinement 52.57.Bc Target design and fabrication 52.57.Fg Implosion symmetry and hydrodynamic instability (Rayleigh-Taylor,Richtmyer-Meshkov, imprint, etc.) 52.57.Kk Fast ignition of compressed fusion fuels 52.58.Lq Z-pinches, plasma focus and other pinch devices 52.59.-f Intense particle beams and radiation sources (see also 29.25.-t and 29.27.-a in instrumentation for particle and nuclear physics) 52.59.Bi Grid- and ion-diode-accelerated beams 52.59.Dk Magneto-plasma accelerated plasmas 52.59.Fn Multistage accelerated heavy-ion beams 52.59.Hq Dense plasma focus 52.59.Mv High-voltage diodes (for high-currentand high-voltage technology, see 84.70.+p) 52.59.Px Hard X-ray sources 52.59.Qy Wire array Z-pinches 52.59.Rz Free-electron devices (for free-electron lasers, see 41.60.Cr) 52.59.Sa Space-charge-dominated beams 52.59.Tb Moderate-intensity beams 52.59.Wd Emittance-dominated beams 52.59.Ye Plasma devices for generation of coherent radiation 52.65.Vv Perturbative methods 52.65.Ww Hybrid methods 52.65.Yy Molecular dynamics methods 52.72.+v Laboratory studies of space-and astrophysical-plasma processes (see also 95.30.Qd in fundamental aspects of astrophysics and 94.20.-y and 94.30.-d in aeronomy and magnetospheric physics) 52.75.Xx Thermionic and filament based sources (e.g., Q machines, double- and triple-plasma devices, etc.) 52.77.-j Plasma applications 52.77.Bn Etching and cleaning (see also 81.65.Cf in surface treatments) 52.77.Dq Plasma-based ion implantation and deposition (see also 81.15.Jj Ion and electron beam-assisted deposition) 52.77.Fv High-pressure, high-current plasmas (plasma spray, arcwelding, etc.) (see also 81.15.Rs Spray coating techniques) ..... Chemical synthesis and other applications, see 81.20.Ka 61.30.Dk Continuum models and theories of liquid crystal structure 61.30.Hn Surface phenomena: alignment, anchoring, anchoring transitions,surface-induced layering, surface-induced ordering, wetting, prewetting transitions, and wetting transitions 61.30.Mp Blue phases and otherdefect-phases 61.30.Pq Microconfined liquid crystals: droplets, cylinders, randomly confined liquid crystals, polymer dispersed liquid crystals, and porous systems (see also section 68 Surfaces, interfaces, thin films and low-dimensional structures) 61.30.St Lytropic phases 61.30.Vx Polymer liquid crystals 62.25.+g Mechanical properties of nanoscale materials 64.70.Nd Structural transitions in nanoscale materials 65.40.-b Thermal properties of crystalline solids (for specific heat of superconductors, see 74.25.Bt;for specific heat of magnetic systems, see 75.40.Cx) 65.40.Ba Heat capacity 65.40.De Thermal expansion; thermomechanical effects 65.40.Gr Entropy and other thermodynamical quantities 65.60.+a Thermal properties of amorphous solids and glasses: heat capacity, thermal expansion, etc. 65.80.+n Thermal properties of small particles, nanocrystals, nanotubes (see also 82.60.Qr Thermodynamics of nanoparticles in physical chemistry and chemical physics) 66.30.Pa Diffusion in nanoscale solids 66.30.Xj Thermal diffusivity 68.03.-g Gas-liquid and vacuum-liquid interfaces 68.03.Cd Surface tension and related phenomena 68.03.Fg Evaporation and condensation 68.03.Hj Structure, measurements and simulations 68.03.Kn Dynamics (capillary waves) 68.05.-n Liquid-liquid interfaces 68.05.Cf Structure, mesurements and simulations 68.05.Gh Interfacial properties of microemulsions 68.08.-p Liquid-solid interfaces 68.08.Bc Wetting 68.08.De Structure, measurements and simulations ..... Crystal growth, biomineralization,see 81.10.Dn, Fq 68.18.-g Langmuir-Blodgett films on liquids (for L-B films on solids, see 68.47.Pe) 68.18.Fg Structure: measurements and simulations 68.18.Jk Phase transitions 68.35.Af Atomic scale friction 68.35.Iv Acoustical properties 68.35.Np Adhesion 68.37.-d Microscopy of surfaces, interfaces, and thin films 68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM) 68.37.Hk Scanning electron microscopy (SEM) (including EBIC) 68.37.Lp Transmission electron microscopy (TEM) (including STEM, HRTEM, etc.) 68.37.Nq Low energy electron microscopy (LEEM) 68.37.Ps Atomic force microscopy (AFM) 68.37.Rt Magnetic force microscopy (MFM) 68.37.Tj Acoustic force microscopy 68.37.Uv Near-field scanning microscopy and spectroscopy 68.37.Vj Field emission and field-ion microscopy 68.37.Xy Scanning Auger microscopy, photoelectron microscopy 68.37.Yz X-ray microscopy 68.43.-h Chemisorption/physisorption: adsorbates on surfaces 68.43.Bc Ab initio calculations of adsorbate structure and reactions (see also 81.65.Mq Oxidation) 68.43.De Statistical mechanics of adsorbates 68.43.Fg Adsorbate structure (binding sites, geometry) 68.43.Hn Structure of assemblies of adsorbates (two- and three-dimensional clustering) 68.43.Jk Diffusion of adsorbates, kinetics of coarsening and aggregation 68.43.Mn Adsorption/desorption kinetics 68.43.Pq Adsorbate vibrations 68.43.Rs Electron stimulated desorption 68.43.Tj Photon stimulated desorption 68.43.Vx Thermal desorption 68.47.-b Solid-gas/vacuum interfaces: types of surfaces 68.47.De Metallic surfaces and metal alloys 68.47.Gh Oxide surfaces 68.47.Jn Clusters on oxide surfaces 68.47.Mn Polymer surfaces 68.47.Pe Langmuir-Blodgett films on solids, polymers on surfaces, biological molecules on surfaces 68.49.-h Surface characterization by particle-surface scattering 68.49.Bc Atom scattering from surfaces (diffraction and energy transfer) 68.49.Df Molecule scattering from surfaces (energy transfer, resonances, trapping) 68.49.Fg Cluster scattering from surfaces 68.49.Jk Electron scattering from surfaces 68.49.Sf Ion scattering from surfaces (charge transfer, sputtering, SIMS) 68.49.Uv X-ray standing waves ..... Surface and interface electronstates, see section 73.20.-i ..... Electronic structure of adsorbates, see 73.20.Hb ..... Vibrational spectroscopy (IR,Raman, ATR), see 78.30.-j ..... Electron spectroscopy(EELS, Auger, metastable quenching spectroscopy)see 79.20.-m ..... Photoelectron spectroscopy (XPS and UPS), see 79.60.-i ..... Nonlinear spectroscopy (second harmonic, sum frequency generation etc.), see 42.65.Ky ..... Electron diffraction (LEED, RHEED)see 61.14.-x ..... Surface enhanced spectroscopy, plasmons,see 73.20.Mf ..... Near-field spectroscopy, see 68.37.Uv 68.55.Ac Nucleation and growth: microscopic aspects 68.65.-k Low-dimensional, mesoscopic, and nanoscale systems: structure and nonelectronic properties (for structure of nanoscale materials, see 61.46.+w) ..... Growth of low-dimensional structures, see 81.16.-c 68.65.Ac Multilayers 68.65.Cd Superlattices 68.65.Fg Quantum wells 68.66.Hb Quantum dots 68.66.La Quantum wires 71.15.Dx Computational methodology (Brillouin zone sampling, iterative diagonalization, pseudopotential construction) 71.15.Qe Excited states: methodology (see also 71.10.Li) 71.38.-k Polarons and electron-phonon interactions (see also 63.20.Kr Phonon-electron interactions in lattices) 71.38.Cn Mass renormalization in metals 71.38.Fp Large or Fröhlichpolarons 71.38.Ht Self-trapped or small polarons 71.38.Mx Bipolarons 72.25.-b Spin polarized transport 72.25.Ba Spin polarized transport in metals 72.25.Dc Spin polarized transport in semiconductors 72.25.Fe Optical creation of spin polarized carriers 72.25.Hg Electrical injection of spin polarized carriers 72.25.Mk Spin transport through interfaces 72.25.Pn Current-driven spin pumping 72.25.Rb Spin relaxation and scattering 73.20.Qt Electron solids 73.21.-b Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems (for electron states in nanoscale materials, see 73.22.-f) 73.21.Ac Multilayers 73.21.Cd Superlattices 73.21.Fg Quantum wells 73.21.Hb Quantum wires 73.21.La Quantum dots 73.22.-f Electronic structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals 73.22.Dj Single particle states 73.22.Gk Broken symmetry phases 73.22.Lp Collective excitations 73.43.-f Quantum Hall effects 73.43.Cd Theory and modeling 73.43.Fj Novel experimental methods; measurements 73.43.Jn Tunneling 73.43.Lp Collective excitations 73.43.Nq Quantum phase transitions 73.43.Qt Magnetoresistance 73.63.-b Electronic transport in mesoscopic or nanoscale materials and structures 73.63.Bd Nanocrystalline materials 73.63.Fg Nanotubes 73.63.Hs Quantum wells 73.63.Kv Quantum dots 73.63.Nm Quantum wires 73.63.Rt Nanoscale contacts 74.20.Rp Pairing symmetries(other than s-wave) 74.70.Pq Ruthenates 75.60.Jk Magnetization reversal mechanisms 75.70.Rf Surface magnetism 75.75.+a Magnetic properties of nanostructures 78.67.-n Optical properties of nanoscale materials and structures 78.67.Bf Nanocrystals and nanoparticles 78.67.Ch Nanotubes 78.67.De Quantum wells 78.67.Hc Quantum dots 78.67.Lt Quantum wires 78.68.+m Optical properties of surfaces 79.20.Uv Electron energy loss spectroscopy (see also 82.80.Pv Electron spectroscopy in physical chemistry and chemical physics; 34.80.-i Electron scattering in atomic and molecular physics) 81.05.Uw Carbon, diamond, graphite 81.07.-b Nanoscale materials and structures: fabrication and characterization 81.07.Bc Nanocrystalline materials 81.07.De Nanotubes 81.07.Lk Nanocontacts 81.07.Nb Molecular nanostructures 81.07.Pr Organic-inorganic hybrid nanostructures 81.07.St Quantum wells 81.07.Ta Quantum dots 81.07.Vb Quantum wires 81.07.Wx Nanopowders 81.16.-c Methods of nanofabrication and processing 81.16.Be Chemical synthesis methods 81.16.Dn Self-assembly 81.16.Fg Supramolecular and biochemical assembly 81.16.Hc Catalytic methods 81.16.Mk Laser-assisted deposition 81.16.Nd Nanolithography 81.16.Pr Nanooxidation (see also 82.37.Np Single molecule reaction kinetics in physical chemistry and chemical physics) 81.16.Rf Nanoscale pattern formation 81.16.Ta Atom manipulation (see also 82.37.Gk STM and AFM manipulation of a single moleculare in physical chemistry and chemical physics) 82.20.Bc State selected dynamics and product distribution 82.20.Ej Quantum theory of reaction cross section 82.20.Gk Electronically non-adiabatic reactions 82.20.Ln Semiclassical theory of reactions and/or energy transfer 82.20.Nk Classical theories of reactions and/or energy transfer 82.20.Sb Correlation function theory of rate constants and its applications 82.20.Uv Stochastic theories of rate constants 82.20.Xr Quantum effects in rate constants (tunneling, resonances, etc.) 82.20.Yn Solvent effects on reactivity 82.30.Gg Positronium chemistry 82.30.Rs Hydrogen bonding, hydrophilic effects 82.33.-z Reactions in various media 82.33.De Reactions in supercritical fluids 82.33.Fg Reactions in clusters (see also 36.40.Jn in atomic and molecular physics) 82.33.Hk Reactions on clusters 82.33.Jx Reactions in zeolites 82.33.Ln Reactions in sol gels, aerogels, porous media 82.33.Nq Reactions in micells 82.33.Pt Solid state chemistry ..... Biologically important reactions, see 82.39.Rt 82.33.Tb Atmospheric chemistry (see also 92.60.Hp and 94.10.Fain geophysics) 82.33.Vx Reactions in flames, combustion, and explosions 82.33.Xj Plasma reactions (including flowing afterglow and electric discharges) 82.33.Ya Chemistry of MOCVD and other vapor deposition methods 82.35.-x Polymers: properties; reactions; polymerization 82.35.Cd Conducting polymers 82.35.Ej Nonlinear optics with polymers (see also 42.65.-k in optics) 82.35.Gh Polymers on surfaces; adhesion (see also 68.43.-h in surfaces, interfaces, thin films, and low-dimensional structures) 82.35.Jk Copolymers, phase transitions, structure 82.35.Lr Physical properties of polymers 82.35.Np Nanoparticles in polymers 82.35.Pq Biopolymers, biopolymerization (see also 87.15.Rn in biological and medical physics 82.35.Rs Polyelectrolytes ..... Protein properties, folding, see 87.15.Cc in biological and medical physics ..... Enzymes, see 82.39.Fk ..... DNA/RNA, see 82.39.Pj 82.37.-j Single molecule kinetics 82.37.Gk STM and AFM manipulations of a single molecule 82.37.Np Single molecule reaction kinetics, dissociation, etc. 82.37.Rs Single molecule manipulation of proteins and other biological molecules 82.37.Vb Single molecule photochemistry 82.39.-k Chemical kinetics in biological systems (see also 87.15.Rn in biological and medical physics) 82.39.Fk Enzyme kinetics 82.39.Jn Charge (electron, proton) transfer in biological systems 82.39.Pj Nucleic acids, DNA and RNA bases 82.39.Rt Reactions in complex biological systems 82.39.Wj Ion exchange, dialysis, osmosis, electro-osmosis, membrane processes 82.40.Np Temporal and spatial patterns in surface reactions 82.40.Qt Complex chemical systems (for complex biological systems, see 82.39.Rt) 82.45.-h Electrochemistry and electrophoresis 82.45.Fk Electrode kinetics 82.45.Jn Surface structure, reactivity and catalysis 82.45.Mp Thin layers, films, monolayers 82.45.Qr Electrodeposition and electrodissolution (see also 81.15.Pq in methods of deposition of films and coatings in materials science) 82.45.Tv Bioelectrochemistry 82.50.Bc Processes caused by infrared radiation 82.50.Hp Processes caused by visible and UV light 82.50.Kx Processes caused by X-rays or gamma-rays 82.50.Nd Control of photochemical reactions 82.50.Pt Multiphoton processes 82.53.-k Femtochemistry 82.53.Eb Pump probe studies of photodissociation 82.53.Hn Pump probe experiments with bound states 82.53.Kp Coherent spectroscopy of atoms and molecules 82.53.Mj Femtosecond probing of semiconductor nanostructures 82.53.Ps Femtosecond probing of biological molecules 82.53.St Femtochemistry of adsorbed molecules 82.53.Uv Femtosecond probes of molecules in liquids 82.53.Xa Femtosecond probes of molecules in solids and of molecular solids 82.56.-b Nuclear magnetic resonance (see also 33.25.+k in atomic and molecular physics, and 76.60.-k and 76.70.-r in condensed matter) 82.56.Dj High resolution NMR 82.56.Fk Multidimensional NMR 82.56.Hg Multinuclear NMR 82.56.Jn Pulse sequences in NMR 82.56.Lz Diffusion 82.56.Na Relaxation 82.56.Pp NMR of biomolecules 82.56.Ub Structure determination with NMR ..... ENDOR(see 76.70.Dx in condensed matter, and 33.40.+f in atomic and molecular physics) ..... NMR imaging, see 76.60.Pc in condensed matter 82.60.Qr Thermodynamics of nanoparticles ..... Irreversible thermodynamics, nonequilibrium thermodynamics,see 05.70.Ln 82.70.Uv Surfactants, micellar solutions, vesicles, lamellae, amphiphilic systems, (hydrophilic and hydrophobic interactions) (see also 82.30.Rs in specific chemical reactions) 82.75.-z Molecular sieves, zeolites, clathrates, and other complex solids 82.75.Fq Synthesis, structure determination, structure modeling 82.75.Jn Measurements and modeling of molecule migration in zeolites 82.75.Mj Measurements and simulation of properties (optical, structural) of molecules in zeolites 82.75.Qt Mechanism and kinetics of catalysis in zeolites (measurements or simulations) 82.75.Vx Clusters in zeolites 82.80.Dx Analytical methods involving electronic spectroscopy 82.80.Gk Analytical methods involving vibrational spectroscopy 82.80.Ha Analytical methods involving rotational spectroscopy 82.80.Nj Fourier transform mass spectrometry 82.80.Qx Ion cyclotron resonance mass spectrometry 82.80.Rt Time of flight mass spectrometry 83.10.Gr Constitutive relations 83.10.Kn Reptation and tube theories 83.10.Mj Molecular dynamics,Brownian dynamics 83.10.Rs Computer simulation of molecular and particle dynamics 83.10.Tv Structural and phase changes 83.50.Ha Flow in channels 83.50.Rp Wall slip and apparent slip 83.50.Uv Material processing (extension, molding, etc) 83.50.Xa Mixing and blending 83.60.-a Material behavior 83.60.Bc Linear viscoelasticity 83.60.Df Nonlinear viscoelasticity 83.60.Fg Shear rate dependent viscosity 83.60.Hc Normal stress differences and their effects (e.g., rod climbing) 83.60.Jk Extrudate swell 83.60.La Viscoplasticity; yield stress 83.60.Np Effects of electric and magnetic fields 83.60.Pq Time-dependent structure (thixotropy, rheopexy) 83.60.Rs Shear rate-dependent structure (shear thinning and shear thickening) 83.60.St Non-isothermal rheology 83.60.Uv Wave propagation,fracture, and crack healing 83.60.Wc Flow instabilities 83.60.Yz Drag reduction 83.80.Ab Solids: e.g., composites, glasses, semicrystalline polymers 83.80.Fg Granular solids 83.80.Hj Suspensions, dispersions, pastes, slurries, colloids 83.80.Iz Emulsions and foams 83.80.Kn Physical gels and microgels 83.80.Mc Other natural materials (e.g., wood and other vegetable materials) 83.80.Qr Surfactant and micellar systems, associated polymers 83.80.Rs Polymer solutions 83.80.Sg Polymer melts 83.80.Tc Polymer blends 83.80.Uv Block copolymers 83.80.Va Elastomeric polymers 83.80.Wx Filled elastomers 83.80.Xz Liquid crystals: nematic, cholesteric, smectic, discotic, etc 83.80.Ya Processed food 83.85.Fg NMR/magnetic resonance imaging (see also 76.60.Pc NMR imaging in condensed matter) 83.85.Hf X-ray and neutron scattering 83.85.Rx Extensional flow measurement 83.85.St Stress relaxation 83.85.Tz Creep and/or creep recoil 83.85.Vb Small amplitude oscillatory shear (dynamic mechanical analysis) 85.25.Oj Superconducting optical, x-ray, and gamma-ray detectors (SIS, NIS, transition edge) 85.35.-p Nanoelectronic devices 85.35.Be Quantum well devices (quantum dots, quantum wires, etc.) 85.35.Ds Quantum interference devices 85.35.Gv Single electron devices 85.35.Kt Nanotube devices 85.50.-n Dielectric, ferroelectric, and piezoelectric devices 85.50.Gk Non-volatile ferroelectric memories 85.70.Xy Magnetoelectronic devices 85.75.-d Magnetoelectronics: devices exploiting spin polarized transport or integrated magnetic fields 85.75.Bb Magnetic memory using giant magnetoresistance 85.75.Dd Magnetic memory using magnetic tunnel junctions 85.75.Ff Reprogrammable magnetic logic 85.75.Hh Spin polarized field effect transistors 85.75.Mm Spin polarized resonant tunnel junctions 85.75.Nn Hybrid Hall devices 85.75.Ss Magnetic field sensors using spin polarized transport 85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices 89.20.-a Interdisciplinary applications of physics 89.20.Bb Industrial and technological research and development 89.20.Dd Military technology and weapons systems; arms control 89.20.Ff Computer science and technology 89.20.Hh World Wide Web, Internet 89.20.Kk Engineering 89.30.-g Energy resources (see also 84.60.-h Direct energy conversion and storage) 89.30.Aa Fossil fuels 89.30.Cc Solar power 89.30.Ee Hydroelectric, hydrothermal, geothermal and wind power 89.30.Gg Nuclear fission power (for fission reactors, see 28.41.-i and 28.50.-k in nuclear physics) 89.30.Jj Nuclear fusion power (for fusion reactors, see 28.52.-s in nuclear physics) 89.60.-k Environmental studies (for ecology, see 87.23-n in biological and medical physics) 89.60.Ec Environmental safety 89.60.Fe Environmental regulations 89.60.Gg Impact of natural and man-made disasters 89.65.-s Social systems 89.65.Cd Demographic studies 89.65.Ef Social organizations; anthropology 89.65.Gh Economics, business, and financial markets 89.65.Lm Urban planning and construction 89.75.-k Complex systems 89.75.Da Systems obeying scaling laws 89.75.Fb Structures and organization in complex systems 89.75.Hc Networks and genealogical trees 89.75.Kd Patterns 91.10.Pp Gravimetric measurements and instruments Modified Categories02.20.Hj Classical groups |

