Topics(Time)

If you had a look at "TOPICS" you have seen that it is possible to extract topics from a document collection without previous knowledge. This can also be done as a function of time of course. To do this, we devide the collection into time intervalls of five years and extract topics from any of these subcollections. As the number of documents in any of these subcollections is smaller than in the complete collection, we reduce the number of topics to extract to 10. Now you are able to track how a topic changes over time. To make this easier, some keywords are highlighted in different colors.


TopicID, Words (Period 1976-1980)

1: invention acid glass groups formula polyurethane diisocyanate mm isocyanate molecular reaction weight glycol mixture content diol temperature compounds chain preferably

2: casting surface solution film substrate liquid polymer area invention solvent coupler barrier substantially method plastic films formed ultrathin contact comprising

3: parts acrylate oil radiation mixture coating added reaction wax unsaturated part coatings ether temperature release product film diacrylate material alkyd

4: resin weight polymer carbon claim group acid vinyl polymers percent process reaction prepared product invention chloride sodium selected epoxy compound

5: material mold surface fig member lens surfaces roll body heat wall bandage form members means cast method orthopedic forming pipe

6: polymer percent metal layer composite fiber film polymers alloy surface invention tin forming weight thermoplastic temperature preferably alloys shaped formed

7: polymerization polymer temperature monomer zone plate water methacrylate time process syrup weight heat mixture belts methyl reaction initiator amount mm

8: membrane water solution casting polymer membranes solvent cast temperature film coating coated paper acetate invention process high weight polyvinyl rate

9: weight acid composition compositions polymeric liquid component polymer material properties present parts copolymer form preferred methyl strength agent amount invention

10: particles size particle dispersion volume composition casting microns methacrylate surface parts polymer coating zinc peroxide viscosity weight steel cm dispersant

TopicID, Words (Period 1981-1985)

1: material coating cast polyvinyl water unsaturated claim lens mold composition surface metal acrylic optical fig urethane coated binder method resin

2: film polymer poly solution solvent aromatic films present temperature invention precursor polymers phenylene acid form claim acetylene tcnq arsenic process

3: casting surface resin substrate web system nylon water microporous polyamide invention acid modifying composition modified groups weight formic filter al

4: weight urea polymer formaldehyde component gel product invention material mixture process casting temperature particles parts ratio resin claim matrix liquid

5: membrane solution membranes process polymer solvent casting claim water temperature invention layer preferably thickness weight semipermeable concentration cast pressure step

6: fig plate cross band section slip shown provided wheel surface means end invention tube diameter heat slide made mould cast

7: membrane gas acid polymer separation blend invention alcohol cellulose membranes thin film organic acetate vinyl set mixture poly water comprises

8: film polymerization reaction fluorine vinyl acid monomer invention obtained layer cm hours cf vessel group polymer substance present grams amount

9: monomer polymer str alkyl preferably monomers formula methacrylate weight acrylate mixture methyl atoms copolymer polymers composition number groups acrylic invention

10: liquid polymer cell composition cathode process weight anode ml metal side groups form solid liner water temperature central ether compartment

TopicID, Words (Period 1986-1990)

1: coating mold fiber material invention resin core high fig transducer claim porous method polymer made present preferably materials body ceramic

2: methacrylate weight monomer resin polymer copolymer methyl graft group acrylate polymerization acrylic surface monomers polypropylene starch parts agent properties acid

3: polymer weight percent process composition temperature liquid mixture blend polymers low casting invention product poly control carbonate propylene binder component

4: water cast material pouch assembly means limb mixture hec hardenable sil soft type solution polymer reaction fig soluble goods silated

5: acid solution aromatic grams groups added group mole chloride prepared urethane prepolymer str invention bis molecular polyurethane polymer preparation mixture

6: membrane polymer membranes film solution gas support water separation solvent temperature layer process films prepared claim hours weight cast porous

7: solvent invention process pore casting polymers preferably polymer solvents free preferred reaction anhydride product reactant carbon temperature microporous liquid pressure

8: water polymer weight composition acid high invention molecular matrix claim solution glycol groups hydrophilic release copolymer percent present ph cross

9: sheet temperature roll casting melt heat film mm crystallization rate high surface pas process obtained alloy degree treatment invention resistance

10: surface fig lens polymer method invention member end layer optical material surfaces structure means mould formed claim cast shown adhesive

TopicID, Words (Period 1991-1995)

1: metal polymer mold cast coating composition surface parts invention powder casting agent oxide layer form binder silica weight paper method

2: polymer film solution invention ml acid particles films polymers composite poly method claim al substrate conductive group solvent matrix liquid

3: membrane water solution polymer membranes casting invention electrode sensor cm preferred present claim fabric microporous solvent hydrophilic enzyme matrix materials

4: fig member casting end surface assembly gas means outer portion layer invention material belt polymer section apparatus ring lower view

5: reaction mixture vinyl invention formula str copolymer polymers product copolymers grams dioxolane hydrogen alkyl hours carbon mmol atoms drug polymer

6: material liquid filler composition component weight cement polymer water percent mixture temperature materials claim aggregate particles invention liner part form

7: ceramic polymer method material fiber surface mold resin temperature structure invention fibers step composite forming layer pps optical fig part

8: weight resin polymer methacrylate preferably acid organic acrylic temperature groups poly solvent methyl invention acrylate present monomer compound water parts

9: film coat surface sheet conductive paint layer adhesive substrate release polyester coated resin process cast laminate plastic carrier invention primer

10: polymer ethylene film al melt polymers weight composition html file localhost extrusion films high density low linear polyethylene process percent

TopicID, Words (Period 1996-2000)

1: polymer film ethylene composition layer weight preferably density invention polymers melt polyethylene films percent copolymer propylene cm olefin linear extrusion

2: mold material ceramic polymer invention fig casting method surface metal layer composite part formed present resin molding cast liner structure

3: layer substrate liquid polymer optical film plate crystal al cell solution surface polystyrene light thin material cells organic claim process

4: powder al alloy temperature wt sheet mixture iron fig method strength binder invention water cement alloys cold step cast weight

5: resin weight casting coat cast composition invention material polymer acrylic mixture parts polyester coating surface resins component filler claim sheet

6: polymer membrane particles matrix solution mixed solvent gas poly separation film composite preferably membranes method porous temperature cms carbon size

7: group polymerization acid mo polymer process water compound solution catalyst mi reaction metal weight monomer mrow added ch aqueous claim

8: film temperature polymer surface process thickness invention dope foam oriented pressure present casting melt sheet polypropylene size means web al

9: release neurotoxin polymer al toxin botulinum controlled type implant system active invention method solution drug tissue form amount hydrogel desired

10: membrane membranes polymer invention solution pore ph water casting surface weight peo hydrophilic cmc microporous charge method pores present acid

TopicID, Words (Period 2001-2005)

1: membrane polymer membranes solution invention porous water pore casting method matrix al fiber present size process surface temperature solvent preferably

2: mo peo mi cmc ph gel mrow membranes invention weight gels solution cross molecular gas al composition fig acid made

3: polymer composite electrolyte fuel cell material based al high membrane acid method carbon cells invention wt gas solid conductivity nafion

4: layer material pattern mold substrate display layers coating liquid al invention film materials light casting surface claim process crystal coated

5: polymer weight preferably ethylene film density films temperature melt catalyst invention percent cm molecular metallocene polymers copolymer blend olefin zirconium

6: resin preferably invention acid composition weight core resins glass metal binder include material fiber polymer present organic polyester parts high

7: film polymer casting layer optical surface solvent fig thickness invention dope jp method web present temperature direction solution subpad photoresist

8: resin light group phase anti polymer film meth curable layer acrylate glare monomer weight structure liquid compound lens microchannel cellulose

9: polymer poly polymers thiophene al invention conductive group thieno acid organic solution film alkyl nm claim conducting substituted comprising light

10: polymer fig flow structure sample micro fluid method cast tip housing pressure invention silica structures device suitable place end pipette

TopicID, Words (Period 2006-2010)

1: membrane html localhost al membranes file layer solution polymer method layers process pore film structure invention size microporous cast porous

2: polymer film nm birefringence poly positive claim method methacrylate oasu styrene acrylate alkyl groups embodiment copolymer vinyl backbone image greater

3: polymer solution membrane water al invention acid solvent photoresist block present layer method poly polymers electrolyte sulfonated composition electrode matrix

4: polymer weight acid polymers films ch pla biodegradable al temperature percent composition based invention properties claim comprising wt substituted thermoplastic

5: percent ethylene polymer mo block mi preferably weight film temperature polymers olefin peak copolymers mrow elastic greater pat laminate interpolymer

6: group film preferably cellulose layer acid ch weight optical compound method invention ester type preferred ring parts liquid atom formula

7: material composite process contact materials gel invention fig low dielectric water oxide light high lens mold pre cast preferably weight

8: layer shape display surface substrate polymer liquid film fig cast crystal article pressure memory invention layers portion transfer printing material

9: invention mold ceramic metal surface material composite structure pattern foam embodiment present fig plate polymer method formed body high reaction

10: film casting jp dope solvent polymer air surface device preferably direction temperature chamber die drying method side range flow solution