the metal oxide gas system as an electrochemical cell
conduction model of metal oxide gas sensors
Ngày tải lên :
19/03/2014, 16:47
... compact layers, the gas cannot penetrate into the sensitive layer and the gas interaction is only taking place at the geometric surface In the case of porous layers the gas penetrates into the sensitive ... Generally the conductance or the resistance of the sensor is monitored as a function of the concentration of the target gases Additionally the performance of the sensor depends on the Measurement ... determine the actual relationship between the conductance of the sensing layer and the concentration of the gas species: surface chemistry, which means the interaction of the reacting gas species at the...
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Transition metal oxide based nanaostructures as supercapacitor electrodes
Ngày tải lên :
09/09/2015, 18:57
... is the key for realizing highperformance supercapacitors In the thesis work, transition -metal- oxide- based nanostructures, manganese dioxide nanostructures, ruthenium oxide nanotubes, as well as ... interpret the formation of ruthenium oxide nanotubes The ruthenium oxide nanotubes exhibited better electrochemical performance than that of ruthenium oxide nanoparticles The results showed that the ... and Goodenough, 1999) The manganese oxide was synthesized by a co-precipitation method in which the redox reaction between potassium permanganate and manganese acetate occurred in water It was...
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Development of semiconductor metal oxide gas sensors modified by mesoporous silica materials
Ngày tải lên :
12/09/2015, 08:20
... selectivity and response time Resistance Reducing gas in Rair Rgas time Figure 2.3 A typical transient response of an n-type gas sensor to the reducing gas Sensitivity of a gas sensor is a measure of the ... (H2S), sulfur dioxide (SO2), ozone (O3), ammonia (NH3), and organic gases such as methane (CH4), propane (C3H8), liquid petroleum gas (LPG), and many others Most important is once a gas sensor is ... certain gas among other gases Response time measures how long it will take for a gas sensor to change from initial state to the new state when the detected gas is introduced For an ideal gas sensor,...
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AN0566 using the PORTB interrupt on change as an external interrupt
Ngày tải lên :
11/01/2016, 11:51
... about the integrity of their code Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code Code protection does not mean that we are guaranteeing the ... willing to work with the customer who is concerned about the integrity of their code Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code Code protection ... CK_RB5 BTFSC LASTPB, RB5 ; Did pin RB5 change CALL RB5_CHG ; RB5 changed and caused the interrupt CK_RB4 BTFSC LASTPB, RB4 ; Did pin RB4 change GOTO RB4_CHG ; RB4 changed and caused the interrupt...
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Solution processed metal oxide interfacial layers for organic solar cells
Ngày tải lên :
10/09/2015, 09:24
... within the conduction band distribute themselves as though they were at thermal equilibrium, with a common Fermi level and temperature The holes within the valence band arrange themselves as though ... 2.10) The hole selective contact/extraction layer (HEL) has a valance band edge that is matched to the donor HOMO and holes are transported to the anode via the valence band The conduction band, ... parasitic resistances The limitations of the thermal decomposition approach as well as improvements in passivation and lifetimes due to NiO are discussed Degradation was studied by IMPS and the...
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Nanostructured metal oxide materials for dye sensitized solar cells
Ngày tải lên :
10/09/2015, 15:49
... groups They found that the red shift in the MLCT band is due to the decrease in the π* level of the terpyridine ligand and an increase in the energy of the t2g metal orbital This dye gave an efficiency ... of performance By observing the shunt and series resistances of the solar cell, a lot can be deduced As the series resistance (Rs) of the device increases, the voltage drop between the junction ... (Pmax) of the cell per unit area divided by the product Voc and Jsc The FF can assume values between and It is attributed to the functioning of the metal oxide/ electrolyte interface The higher the...
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Báo cáo khoa học: "An Evaluation of METAL: the LRC Machine Translation System" ppt
Ngày tải lên :
01/04/2014, 00:20
... Texas, J u l y 1982 As an experlment, the unformatted, interlinear [German-English] version was used for the initial post-edlting phase The text was then reformatted and the 2nd 64 ooj ! -4 n ... b y an INTERCODER, a menu-drlven system whlch asks the user for information in E n g l i s h and encodes the answers into t h e internal form u s e d b y the system A n integral p a r t of the ... in a database and may be-accessed and/or e d i t e d in m u c h the same w a y as the lexicon System software and n a m e d trans formations are s t o r e d in individual source files METAL' s parser...
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USING BRAND AS AN EFFECTIVE WEAPON TO COMPETE IN THE MARKET: A CASE STUDY OF NHAT LINH COMPANY
Ngày tải lên :
13/04/2013, 10:29
... origin (2) The brand -as- organization The brand -as- organization perspective focuses on attributes of the organization rather than those of the product or service Such organizational attributes as innovation, ... as: • • • • What is the soul of the brand? What are the fundamental beliefs and values that drive the brand? What are the competencies of the organization behind the brand? What does the organization ... However, there is a big gap between living standards of the urban areas and the countryside Differences in annual income and purchasing power can be seen between the North and the South of the country...
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THE INFORMAL SECTOR IN SOLID WASTE MANAGEMENT IN DEVELOPING COUNTRIES SUSTAINABILITY EFFECTS OF FORMALISATION CONSIDERING HO CHI MINH CITY – VIETNAM AS AN EXAMPLE
Ngày tải lên :
24/08/2013, 18:48
... ideas of its actors and the demand for the goods and services they offer One of those manifold informal activities, namely the informal waste management systems is in the scope of this thesis Many ... income rather than as waste, take over a part of the burden of the municipal waste collection by sorting out the recycling materials in richer areas On the other hand, part of the waste collection ... Consequently, the choice of materials to collect is in the first place determined by the value of the waste, and in the second place by their ease of extraction, handling and transport Paper, metals and...
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The phenomenon of evaporative cooling from a humid surface as an alternative method for air-conditioning
Ngày tải lên :
05/09/2013, 16:10
... distributions [7] As the main resistance to heat-transfer can be found in the air on the dry face of the system, the advantage of the higher thermal conductance of metals than that of plastics is negligible ... In the last stages of the tunnel there will be no mass-exchange because Relative air Humidity (RH) is 100%, and heat exchange neither, as the air and water temperature are the same Thus, these ... interesting the idea of considering and analyzing the use of these devices Another disadvantage is the water consumption associated to the operation of these systems, which is a scarce resource in dry and...
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Tài liệu Understanding the Internet as an Infrastructure docx
Ngày tải lên :
15/12/2013, 00:15
... computer The disadvantages of this approach are that the application has to arrange for the data in the cookie to be transmitted over the Web as part of every HTTP request so that the Web server can ... rendered as HTML to allow them to operate correctly in any HTML-compliant browser Microsoft has also extended many of the standard HTML controls as well, allowing you to manipulate them in your ... the user can display a page, enter data, click some buttons, and expect the display to change as a result, allowing the user to enter more data, and so on Each request sent by the client to the...
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Tài liệu The reform of the civil service system as Viet Nam moves into the middle income country category doc
Ngày tải lên :
25/12/2013, 06:16
... Vietnam a) Human resource planning There is as yet no proper systematic personnel planning within an overall organisation development plan, based on an analysis of the current situation, the aims ... closest to the current Vietnamese system d) Scandinavian (mixture of Anglo-Saxon and Germanic), which combines the idea of the State and citizen as an organic whole with a participatory and local ... the sense that entry is usually to the lower ranks and more senior positions are filled from within the ranks In position-based systems (also called job-in-rank systems), on the other hand, the...
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Tài liệu Báo cáo khoa học: "An ISU Dialogue System Exhibiting Reinforcement Learning of Dialogue Policies: Generic Slot-filling in the TALK In-car System" pot
Ngày tải lên :
22/02/2014, 02:20
... can be called whenever the system has to decide on the next dialogue move In the original hand-coded system this decision is made by way of a dialogue plan (using the “deliberate” solvable) The ... between the states and actions of both systems, in order to construct an interface between the learnt policies for C OMMUNICATOR and the in-car baseline system 5.2 Mapping between COMMUNICATOR and the ... destination city, otherwise no results can be found for the user Likewise, for the in-car tasks, we consider the foodtype, bar-type, and hotel-location to be more important to fill than the other slots...
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Báo cáo khoa học: Neuroserpin Portland (Ser52Arg) is trapped as an inactive intermediate that rapidly forms polymers Implications for the epilepsy seen in the dementia FENIB ppt
Ngày tải lên :
07/03/2014, 16:20
... - -) and mutant neuroserpin The proteins were added to increasing concentrations of urea, and the change in fluorescence profile was followed by exciting the protein at 295 nm and measuring the ... formation and Tm [19], and thus it was unusual to find that the Tm was higher than that of the less severe Ser49Pro neuroserpin The overall structure of Ser52Arg neuroserpin was therefore assessed ... 0.7 mgÆmL)1 The second derivative of the resulting data was used to calculate the inflection point of the transition and hence the Tm [14] Assessment of the polymerization of wild-type and Ser52Arg...
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Báo cáo khoa học: The cytochrome P450scc system opens an alternate pathway of vitamin D3 metabolism docx
Ngày tải lên :
07/03/2014, 21:20
... min; and 100% methanol and 0.1% acetic acid from 45 to 60 The MS operated in atmospheric pressure chemical ionization (APCI) positive ion mode and nitrogen was used as the nebulizing gas The MS ... °C and the resulting supernatant was centrifuged at 9000 g for 20 at °C to sediment the mitochondrial fraction The pellet was resuspended in 0.25 m sucrose and the mitochondrial fraction was ... parameters were as follows: the nebulizer gas flow rate was 2.5 LÆmin)1; probe high voltage was 3.5 kV, probe temperature was 300 °C, the curved desolvation line heater temperature was 230 °C Analyses...
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Báo cáo khoa học: Identification of sodium salicylate as an hsp inducer using a simple screening system for stress response modulators in mammalian cells pptx
Ngày tải lên :
17/03/2014, 10:20
... activity was consistent with that of the hsp70B gene in mammalian cells [17] Thus, the promoter activities of Hsp105 and Hsp70B can be measured easily using the pGL105/C3H and p173OR/C3H cells, and ... does not enhance the transcription of hsp genes in human HeLa cells and Drosophila [11,18], whereas the drug is also shown to induce Hsp70 synthesis in mouse L929 cells [19] Because transcription ... significantly increased in cells treated with 45 and 60 mM SA However, the levels remained unchanged or decreased, when these cells were incubated at 41 °C for h after the SA treatment These results...
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hybrid metal oxide and multiwall carbon nanotube films for low temperature gas sensing
Ngày tải lên :
19/03/2014, 16:48
... at the surface of metal oxide grains and at the interface of metal oxide grains and MWCNTs, respectively is postulated as the mechanism that could explain the enhanced performance of hybrid metal ... of the same gas was injected, so the next concentration of this gas was reached The same procedure was repeated until all desired concentrations of the different gases under study were measured ... recorded for SnO2 and WO3 -based films ratio between the changes experienced by the sensor resistance after its exposure to a test gas and the sensor baseline resistance in air: Rair − Rgas (1) S= Rair...
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novel hexagonal wo3 nanopowder with metal decorated carbon nanotubes as no2 gas sensor
Ngày tải lên :
20/03/2014, 13:05
... [11,19,20] The dispersion and adequate mixture of the components were enhanced by stirring the solution in an ultrasonic bath for h at 75 ◦ C The resulting paste was then dropped onto the micromachined ... confirmed the change in the phases In Fig 1a is shown the structure of WO3 1/3 H2 O “mother” phase as obtained after hydrothermal preparation The selected area electron diffraction (SAED) of nanopowder ... (ranging from 100 ppb to ppm) were introduced by the direct injection method using a gas- tight chromatographic syringe A fan was employed to provide the homogeneity of gas diffusion inside the...
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semiconducting metal oxide sensor array for the selective detection of combustion gases
Ngày tải lên :
20/03/2014, 13:07
... prior to the gas hit The marked switching events (i.e on and off) differ from those observed in the response and are due to the latency of the gas delivery system This is the time the gas takes ... start and the end of a gas hit (Ri and Rf, respectively) Sensitivity is then defined as S ¼ Rmax =Rmin , where Rmax/Rmin was calculated as Ri/Rf for reducing gases and Rf/Ri for oxidizing gases The ... on screen and stored for further processing, analysis and classification The target gases used were CH4, CO, NO, NO2, NH3, SO2, and H2S Dry air was used as the purge and a carrier gas Flows containing...
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