Toggle navigation
Publications
Profiles
Research Groups
Indexes
Help and information
Eesti keeles
Intranet
Publications
Profiles
Research Groups
Indexes
Help and information
Eesti keeles
Intranet
Databases
Publications
Searching
My bookmarks
0
Energy. Fuel technology (category)
All fields
Source search
Author search
Subject term search
Title search
starts with
containes
exact match
All fields
Source search
Author search
Subject term search
Title search
starts with
containes
exact match
—
All fields
Source search
Author search
Subject term search
Title search
starts with
containes
exact match
—
All fields
Source search
Author search
Subject term search
Title search
starts with
containes
exact match
—
All fields
Source search
Author search
Subject term search
Title search
starts with
containes
exact match
—
Add criteria
Advanced search
filter
Clear
×
types of item
book
..
journal article
..
newspaper article
..
book article
..
dissertation
..
Open Access
..
Scientific publication
..
year
year of publication
Loading..
author
Loading..
TTÜ department
Loading..
subject term
Loading..
series
Loading..
name of the person
Loading..
keyword
Loading..
Clear
Number of records
268
Look more..
(2/454)
Export
export all inquiry results
(268)
Save TXT fail
Save PDF fail
print
Open for editing with marked entries
my bookmarks
display
Bibliographic view
Short view
sort
author ascending
author descending
year of publication ascending
year of publication descending
title ascending
title descending
251
journal article EST
/
journal article ENG
Thermogravimetric analysis and process simulation of oxy‐fuel combustion of blended fuels including oil shale,semicoke, and biomass
Yörük, Can Rüstü
;
Meriste, Tõnis
;
Sener, Sener
;
Kuusik, Rein, keemik
;
Trikkel, Andres
International journal of energy research
2018
/
p. 2213−2224 : ill
https://doi.org/10.1002/er.4011
Journal metrics at Scopus
Article at Scopus
Journal metrics at WOS
Article at WOS
journal article EST
/
journal article ENG
252
journal article EST
/
journal article ENG
A thermomechanical explanation for the topology of crack patterns observed on the surface of charred wood and particle fibreboard
Baroudi, Djebar
;
Ferrantelli, Andrea
;
Li, Kai Yuan
;
Hostikka, Simo
Combustion and flame
2017
/
p. 206-215 : ill
https://doi.org/10.1016/j.combustflame.2017.04.017
Journal metrics at Scopus
Article at Scopus
Journal metrics at WOS
Article at WOS
journal article EST
/
journal article ENG
253
journal article EST
/
journal article ENG
A two-step model for assessing the potential of shale-derived chemicals by oxidation of kukersite
Mets, Birgit
;
Lopp, Margus
;
Uustalu, Jaan Mihkel
;
Muldma, Kati
;
Niidu, Allan
;
Kaldas, Kristiina
Oil shale
2023
/
p. 344-362
https://doi.org/10.3176/oil.2023.4.04
Journal metrics at Scopus
Article at Scopus
Journal metrics at WOS
Article at WOS
journal article EST
/
journal article ENG
254
journal article EST
/
journal article ENG
Underground oil shale mine surveying using handheld mobile laser scanner
Kütimets, Kaia
;
Ellmann, Artu
;
Väli, Erik
;
Kanter, Sander
Oil shale
2021
/
p. 42–64
https://doi.org/10.3176/oil.2021.1.03
Journal metrics at Scopus
Article at Scopus
Journal metrics at WOS
Article at WOS
journal article EST
/
journal article ENG
255
journal article EST
/
journal article ENG
Understanding computational methods for solar envelopes based on design parameters, tools, and case studies : a review
Alkadri, Miktha Farid
;
De Luca, Francesco
;
Turrin, Michel
;
Sariyildiz, Sevil
Energies
2020
/
art. 3302, 25 p. : ill
https://doi.org/10.3390/en13133302
Journal metrics at Scopus
Article at Scopus
Journal metrics at WOS
Article at WOS
journal article EST
/
journal article ENG
256
journal article EST
/
journal article ENG
Upgrading of Estonian shale oil heavy residuum bituminous fraction by catalytic hydroconversion
Luik, Hans
;
Luik, Lea
;
Johannes, Ille
;
Tiikma, Laine
;
Vink, Natalia
;
Palu, Vilja
;
Bitjukov, Mihhail
;
Tamvelius, Hindrek
;
Krasulina, Julia
;
Kruusement, Kristjan
;
Nechaev, Igor
Fuel processing technology
2014
/
p. 115-122 : ill
https://doi.org/10.1016/j.fuproc.2014.02.018
Journal metrics at Scopus
Article at Scopus
Journal metrics at WOS
Article at WOS
journal article EST
/
journal article ENG
257
journal article EST
/
journal article ENG
Utilization of oil shale combustion wastes for PCC production : quantifying the kinetics of Ca(OH)
2
and CaSO
4
·2H
2
O dissolution in aqueous systems
Uibu, Mai
;
Tamm, Kadriann
;
Velts-Jänes, Olga
;
Kallaste, Priit
;
Kuusik, Rein, keemik
;
Kallas, Juha
Fuel processing technology
2015
/
p. 156-164 : ill
https://doi.org/10.1016/j.fuproc.2015.09.010
Journal metrics at Scopus
Article at Scopus
Journal metrics at WOS
Article at WOS
journal article EST
/
journal article ENG
258
journal article EST
/
journal article ENG
Valorisation of waste heat in existing and future district heating systems
Pakere, Ieva
;
Blumberga, Dagnija
;
Volkova, Anna
;
Lepiksaar, Kertu
;
Zirne, Agate
Energies
2023
/
art. 6796
https://doi.org/10.3390/en16196796
Journal metrics at Scopus
Article at Scopus
Journal metrics at WOS
Article at WOS
journal article EST
/
journal article ENG
259
journal article EST
/
journal article ENG
Vapor pressures of narrow gasoline fractions of oil from industrial retorting of Kukersite oil shale
Mozaffari, Parsa
;
Baird, Zachariah Steven
;
Listak, Madis
;
Oja, Vahur
Oil shale
2020
/
p. 287-303 : tab
https://doi.org/10.3176/oil.2020.4.03
Journal metrics at Scopus
Article at Scopus
Journal metrics at WOS
Article at WOS
journal article EST
/
journal article ENG
Seotud publikatsioonid
1
Phase equilibria of complex mixture in the context of unconventional fuel resources = Komplekssete segude faaside tasakaalud mittekonventsionaalsete energiaallikate tehnoloogiates
260
journal article EST
/
journal article ENG
Verification of utility-scale solar photovoltaic plant models for dynamic studies of transmission networks
Machlev, Ram
;
Batushansky, Zohar
;
Soni, Sachin
;
Chadliev, Vladimir
;
Belikov, Juri
;
Levron, Yoash
Energies
2020
/
art. 3191, 20 p. : ill
https://doi.org/10.3390/en13123191
Journal metrics at Scopus
Article at Scopus
Journal metrics at WOS
Article at WOS
journal article EST
/
journal article ENG
261
journal article EST
/
journal article ENG
What's worse, communism or carbon? Using the Transitions Delphi approach to identify viable interventions for the Estonian energy transition
Pahker, Anna-Kati
;
Keller, Margit
;
Karo, Erkki
;
Vihalemm, Triin
;
Solvak, Mihkel
;
Orru, Kati
;
Tammiksaar, Erki
;
Ukrainski, Kadri
;
Noorkõiv, Martin
Energy research & social science
2014
/
art. 103421, 14 p. : ill
https://doi.org/10.1016/j.erss.2024.103421
Journal metrics at Scopus
Article at Scopus
Journal metrics at WOS
Article at WOS
journal article EST
/
journal article ENG
262
journal article EST
/
journal article ENG
Wide input voltage range operation of the series resonant DC-DC converter with bridgeless boost rectifier
Bakeer, Abualkasim Ahmed Ali
;
Chub, Andrii
;
Vinnikov, Dmitri
;
Rosin, Argo
Energies
2020
/
p. 4220−4237
https://doi.org/10.3390/en13164220
Journal metrics at Scopus
Article at Scopus
Journal metrics at WOS
Article at WOS
journal article EST
/
journal article ENG
263
journal article EST
/
journal article ENG
Wide range series resonant DC-DC converter with a reduced component count and capacitor voltage stress for distributed generation
Bakeer, Abualkasim Ahmed Ali
;
Chub, Andrii
;
Blinov, Andrei
;
Lai, Jih-Sheng
Energies
2021
/
art. 2051
https://doi.org/10.3390/en14082051
Journal metrics at Scopus
Article at Scopus
Journal metrics at WOS
Article at WOS
journal article EST
/
journal article ENG
Seotud publikatsioonid
1
Fault-tolerant galvanically isolated DC‑DC converters with zero redundancy = Null-liiasusega veatolerantsed galvaanilise isolatsiooniga alalispingemuundurid
264
journal article EST
/
journal article ENG
Window model and 5 year price data sensitivity to cost-effective facade solutions for office buildings in Estonia
Thalfeldt, Martin
;
Pikas, Ergo
;
Kurnitski, Jarek
;
Voll, Hendrik
Energy
2017
/
p. 685-697 : ill
https://doi.org/10.1016/j.energy.2017.06.160
Journal metrics at Scopus
Article at Scopus
Journal metrics at WOS
Article at WOS
journal article EST
/
journal article ENG
265
journal article EST
/
journal article ENG
Virtual inertia control methods in islanded microgrids
Škiparev, Vjatšeslav
;
Machlev, Ram
;
Chowdhury, Nilanjan Roy
;
Levron, Yoash
;
Petlenkov, Eduard
;
Belikov, Juri
Energies
2021
/
art. 1562, 20 p. : ill
https://doi.org/10.3390/en14061562
Journal metrics at Scopus
Article at Scopus
Journal metrics at WOS
Article at WOS
journal article EST
/
journal article ENG
Seotud publikatsioonid
1
Virtual inertia control of microgrids using deep reinforcement learning methods = Mikrovõrkude virtuaalse inertsi juhtimine sügava stiimulõppe meetoditega
266
journal article EST
/
journal article ENG
Viscosity data for kukersite shale gasoline fractions
Baird, Zachariah Steven
;
Yanchilin, Alexey
;
Oja, Vahur
;
Järvik, Oliver
Oil shale
2022
/
p. 241-251
https://doi.org/10.3176/oil.2022.4.01
Journal metrics at Scopus
Article at Scopus
Journal metrics at WOS
Article at WOS
journal article EST
/
journal article ENG
267
journal article EST
/
journal article ENG
Voltage source operation of the energy-router based on model predictive control
Roasto, Indrek
;
Husev, Oleksandr
;
Najafzadeh, Mahdiyyeh
;
Jalakas, Tanel
;
Rodriguez, Jose
Energies
2019
/
art. 1892, 15 p. . ill
https://doi.org/10.3390/en12101892
Journal metrics at Scopus
Article at Scopus
Journal metrics at WOS
Article at WOS
journal article EST
/
journal article ENG
Seotud publikatsioonid
1
Multifunctional energy router for residential applications = Multifunktsionaalne energiaruuter eramutele
268
journal article EST
/
journal article ENG
Yields and the selected physicochemical properties of thermobitumen as an intermediate product of the pyrolysis of Kukersite oil shale
Astra, Hanna-Liina
;
Albert, Tiina
;
Mozaffari, Sepehr
;
Järvik, Oliver
;
Yanchilin, Alexey
;
Kamenev, Sven
;
Karagöz, Selhan
;
Oja, Vahur
Oil shale
2021
/
p. 295-316
https://doi.org/10.3176/oil.2021.4.02
Journal metrics at Scopus
Article at Scopus
Journal metrics at WOS
Article at WOS
journal article EST
/
journal article ENG
Seotud publikatsioonid
1
Effect of different sweep gases on sulfur behavior during pyrolysis of kukersite oil shale = Pürolüüsikeskkonna mõju väävli käitumisele kukersiitse põlevkivi pürolüüsil
Number of records 268, displaying
251 - 268
previous
2
3
4
5
6
7
8
9
10
11
next
keyword
450
1.
Bluetooth low-energy tracking technology
2.
energy science and technology
3.
mechanical engineering and energy technology
4.
energy forecast wind energy
5.
EROI-Energy returned on energy invested
6.
alkaline anion-exchange membrane fuel cell
7.
alkaline membrane fuel cell
8.
alternative fuel
9.
ammonia as marine fuel
10.
anion exchange membrane fuel cell
11.
ca-rich fuel
12.
fossil fuel
13.
fossil fuel power plants
14.
fuel
15.
Fuel air explosive weapons (FAEs)
16.
fuel ash
17.
fuel cell
18.
fuel cell power systems
19.
fuel cells
20.
fuel cells (FCs)
21.
fuel consumption
22.
fuel economy
23.
Fuel electrode
24.
fuel inorganic part
25.
fuel market
26.
fuel oils
27.
fuel poverty
28.
fuel prices
29.
fuel saving
30.
fuel taxes
31.
fuel VAT
32.
fuel-cost characteristics
33.
high temperature fuel cells
34.
high-velocity air-fuel (HVAF) spraying
35.
liquid fuel
36.
microbial fuel cell
37.
microbial fuel cells
38.
motor fuel
39.
motor fuel (gasoline and diesel)
40.
motor fuel (petrol and diesel)
41.
moulded fuel
42.
non-fossil fuel
43.
oxy-fuel
44.
oxy‐fuel
45.
oxy-fuel combustion
46.
PEM fuel cell
47.
PEM fuel cell cathode
48.
Proton exchange membrane fuel cell
49.
proton-exchange membrane fuel cell
50.
pulverized fuel boilers
51.
rearrangement of fuel market
52.
shale fuel oil
53.
shale fuel oil pollution
54.
ship fuel consumption
55.
Solid Fuel Chemistry
56.
solid oxide fuel cell
57.
wood fuel
58.
activation energy
59.
alternative energy production
60.
annual energy simulation
61.
balancing wind energy
62.
batteries energy storage
63.
battery energy storage
64.
battery energy storage degradation
65.
battery energy storage system
66.
battery energy storage system (BESS)
67.
battery energy storage systems
68.
battery energy storage systems (BESS)
69.
bio-energy
70.
Black Sea energy resources
71.
braking energy
72.
building energy efficiency
73.
building energy modelling
74.
building energy performance simulations
75.
building energy simulation
76.
building energy use
77.
carbon-neutral energy supply
78.
clean energy
79.
CO2 emissions energy renovation
80.
corporate energy self-sufficiency
81.
cost of energy performance
82.
criteria of energy efficiency
83.
cumulative wave energy
84.
cyber physical energy systems
85.
cyber-physical energy systems
86.
daily cumulative energy curves
87.
deep energy levels
88.
deep energy renovation
89.
DHW energy use
90.
digital tools for energy users
91.
direct energy deposition
92.
directed energy deposition
93.
distributed activation energy model
94.
distributed energy resources
95.
distributed energy resources (DERs)
96.
Distributed energy storage
97.
distributed energy systems
98.
district energy
99.
district energy sector
100.
early stage energy assessment
101.
electric energy storage
102.
electric energy substitution
103.
electrical energy
104.
electricity energy use
105.
Electrochemical energy conversion/storage
106.
electrochemical energy storage
107.
embodied energy
108.
empirical energy consumption model
109.
energy
110.
energy management
111.
energy absorption
112.
energy access
113.
energy acquis
114.
energy and carbon balance
115.
energy and cost savings
116.
energy and East and Central Europe
117.
energy and HVAC-systems in buildings
118.
energy and society
119.
energy as generator of the dynamics
120.
energy assessment
121.
energy audit
122.
energy autarky
123.
energy balance
124.
energy balancing
125.
energy barrier
126.
energy buildings
127.
energy calculation for air heating
128.
energy calculations
129.
energy calculator
130.
energy cascade
131.
energy community
132.
energy competitiveness
133.
energy conservation
134.
energy consumption
135.
energy consumption of construction operations
136.
energy contracting
137.
energy control
138.
energy control unit (ECU)
139.
energy conversion
140.
energy conversion efficiency
141.
energy cost
142.
energy crisis
143.
energy demand
144.
energy detection
145.
energy dispersive spectroscopy
146.
energy dispersive x-ray spectroscopy
147.
energy dissipation
148.
energy districts
149.
energy efficiency
150.
energy efficiency and saving
151.
Energy Efficiency Design Index (EEDI)
152.
energy efficiency directive
153.
energy efficiency measures
154.
energy efficiency of AHU
155.
energy efficiency regulations
156.
energy efficient
157.
energy efficient buildings
158.
energy engineering
159.
energy exchange
160.
energy expenditure
161.
Energy flexibility
162.
energy flexibility indices
163.
energy flow
164.
energy flux
165.
energy for free
166.
energy forecast
167.
energy forecasting
168.
energy futures
169.
energy generation
170.
energy grid
171.
energy harvesting
172.
energy informatics
173.
energy integration
174.
energy internet
175.
energy laboratory
176.
energy levels
177.
energy localization
178.
Energy loss
179.
energy losses
180.
energy management
181.
Energy Management in Microgrid
182.
energy management strategies (EMS)
183.
energy management system
184.
energy market
185.
energy market in the EU
186.
energy markets
187.
energy metabolism
188.
energy modeling
189.
energy modelling
190.
energy models
191.
energy optimization
192.
energy perfomance of buildings
193.
energy performance
194.
energy performance building directive (EPBD)
195.
energy performance certificate
196.
energy performance certificates (EPC)
197.
energy performance gap
198.
energy performance minimum requirements
199.
energy performance of buildings
200.
energy performance of buildings directive (EPBD)
201.
energy piles
202.
energy planning
203.
energy policy
204.
energy politics
205.
energy potential
206.
energy poverty
207.
energy prediction
208.
energy prices
209.
energy pricing
210.
energy priorities in Europe
211.
energy production
212.
energy recovery
213.
energy reduction
214.
energy refurbishment
215.
energy regulation
216.
energy related
217.
energy renovation
218.
energy retrofit
219.
energy retrofitting
220.
energy roadmap
221.
energy router
222.
energy saving
223.
energy saving cars
224.
energy saving device (ESD)
225.
energy saving measures
226.
energy savings
227.
energy sector
228.
energy security
229.
energy security indicator
230.
energy simulation
231.
energy simulation software
232.
energy simulations
233.
energy stability
234.
energy states
235.
energy storage
236.
energy storage device
237.
energy storage devices
238.
energy storage dimensioning
239.
energy storage system
240.
energy storage system (ESS)
241.
energy storage systems
242.
energy supplies
243.
energy sustainability
244.
energy system
245.
energy system analysis
246.
energy system management
247.
energy system model
248.
energy system modeling
249.
energy systems
250.
energy targets
251.
energy technologies
252.
energy trading
253.
energy transaction
254.
energy transfer
255.
energy transition
256.
energy use
257.
energy use baseline
258.
energy use prediction
259.
energy use reduction
260.
energy yield
261.
energy yield prediction
262.
energy-as-a-service
263.
energy-awareness
264.
energy-efficient buildings
265.
energy-efficient computing
266.
energy-efficient stimulation
267.
energy-management system
268.
energy-renovation
269.
Eu Energy Law
270.
final energy
271.
flywheel energy storage systems (FESS)
272.
free energy principle
273.
Free-energy principle
274.
generation of electric energy
275.
geothermal energy
276.
geothermal energy recovery
277.
green and energy efficient housing
278.
green energy
279.
heating and cooling energy cost
280.
heating energy system
281.
heating energy use
282.
Helmholtz free energy
283.
high energy ballmilling
284.
high energy milled activation
285.
high energy milling
286.
High energy physics
287.
high penetration of renewable energy sources (RESs)
288.
high-energy astrophysics
289.
high-energy ball milling
290.
high-penetration renewable energy
291.
high-penetration renewable energy sources (RESs)
292.
home battery energy storage system (HBESS)
293.
home energy management
294.
home energy management system
295.
home energy management systems
296.
hybrid energy source
297.
hybrid energy storage system
298.
Hybrid Energy Storage Systems
299.
hybrid energy system
300.
hybrid renewable energy system
301.
hydrogen energy storage
302.
implications of energy data
303.
indoor and outdoor energy harvesting
304.
indoor energy harvesting
305.
innovative energy services
306.
integrated energy service provider (IESP)
307.
integrated energy system
308.
integrated energy systems
309.
intermolecular interaction energy
310.
intracellular energy unit
311.
joint energy-spectral efficiency (ESE)
312.
kinetic energy
313.
laser-assisted directed energy deposition
314.
levelized cost of energy
315.
linear free energy (LFE) relationships
316.
local energy communities
317.
local energy community
318.
local energy market
319.
low energy building
320.
low energy buildings
321.
low energy house
322.
low energy office building
323.
low energy renovation
324.
low-energy building
325.
low-energy buildings
326.
maritime energy contract
327.
multi-energy microgrid
328.
national energy policy
329.
nearly zero energy building
330.
nearly zero energy buildings
331.
nearly zero energy buildings (nZEB)
332.
nearly zero-energy building
333.
Nearly Zero-Energy Buildings
334.
nearly-zero energy buildings
335.
nearly-zero energy-building
336.
net zero energy buildings
337.
net-zero energy
338.
nexus water-energy-food
339.
nonlinear energy sink (NES)
340.
Novel energy storage systems
341.
nZEB deep energy renovation
342.
nuclear energy
343.
offshore wind energy
344.
off-shore wind energy
345.
optimal energy management
346.
optimal multi-energy flows
347.
peer-to-peer energy trading
348.
personalized energy management systems (PEMS)
349.
PES (primary energy savings)
350.
photovoltaic energy
351.
photovoltaic energy converter
352.
photovoltaic energy forecasting
353.
piezoelectric energy harvesting
354.
plowing energy
355.
plus energy house
356.
positive energy districts design
357.
potential energy barrier
358.
potential energy surface
359.
potential energy surfaces
360.
power electronic interfaces for renewable energy sources
361.
primary energy
362.
primary energy efficiency
363.
primary energy factor (PEF)
364.
primary energy factors
365.
primary energy indicator
366.
primary energy indicators
367.
primary energy requirement
368.
primary energy use
369.
pumped-hydro energy storage
370.
Q42 - alternative energy sources
371.
reactive energy
372.
real energy use
373.
Regional integrated energy system (RIES)
374.
renewable energy
375.
Renewable energy certificates (RECs)
376.
renewable energy contribution
377.
Renewable energy generation
378.
renewable energy integration
379.
Renewable energy optimization in buildings
380.
renewable energy ratio
381.
renewable energy resources
382.
Renewable energy source
383.
renewable energy source (RES)
384.
renewable energy sources
385.
renewable energy sources (RES)
386.
Renewable energy sources (RESs)
387.
renewable energy storage
388.
renewable energy system
389.
renewable energy systems
390.
renewable energy systems(RES)
391.
renewable-energy policy
392.
residential battery energy storage system
393.
residential energy
394.
residential energy management
395.
residential energy storage
396.
residential energy storage systems
397.
residential wind energy conversion system
398.
RF energy
399.
simulation of energy consumption
400.
single energy market
401.
sliding energy
402.
smart energy
403.
smart energy management system (SEMS)
404.
smart energy platform
405.
smart energy services
406.
smart green energy systems
407.
solar energy
408.
solar energy materials
409.
solar energy utilization
410.
solar photovoltaic energy
411.
solar PV energy
412.
specific energy
413.
specific energy consumption
414.
specific energy model
415.
Storable chemical energy
416.
strategic energy planning
417.
superconducting magnetic energy storage (SMES)
418.
sustainable energy management
419.
sustainable energy
420.
Zero energy
421.
zero-energy buildings
422.
targeted energy transfer (TET)
423.
Themal energy storage
424.
thermal energy
425.
thermal energy storage
426.
thermal energy storage (TES)
427.
thermochemical energy storage
428.
third energy package
429.
Time of Use energy price
430.
transactive energy
431.
transactive energy system
432.
tumor energy metabolism
433.
Urban Building Energy Modeling (UBEM)
434.
variability of energy flux
435.
variability of renewable energy
436.
variable renewable energy (VRE)
437.
variable wind and solar energy
438.
waste to energy
439.
water-energy systems
440.
wave energy
441.
Wave energy converters
442.
wave energy flux
443.
vertical kinetic energy variability
444.
wide band gap energy
445.
wind energy
446.
wind energy farms
447.
wind energy forecast errors
448.
wind energy generation
449.
wind energy production
450.
virtual energy storage
subject term
4
1.
Statoil Fuel & Retail Eesti AS
2.
Energy Efficient Vehkle
3.
Nordic Energy Research
4.
Respect Energy Holding
×
match
starts with
ends with
containes
sort
Relevance
ascending
descending
year of publication
author
TTÜ department
subject term
series
name of the person
keyword
Otsing
Valikud
0
year of publication
AND
OR
NOT
author
AND
OR
NOT
TTÜ department
AND
OR
NOT
subject term
AND
OR
NOT
series
AND
OR
NOT
name of the person
AND
OR
NOT
keyword
AND
OR
NOT