The major challenge in printable electronics fabrication is to effectively and accurately control a drop-on-demand(Do D) inkjet printhead for high printing quality. In this work, an optimal prediction model, construct...The major challenge in printable electronics fabrication is to effectively and accurately control a drop-on-demand(Do D) inkjet printhead for high printing quality. In this work, an optimal prediction model, constructed with the lumped element modeling(LEM) and the artificial bee colony(ABC) algorithm, was proposed to efficiently predict the combination of waveform parameters for obtaining the desired droplet properties. For acquiring higher simulation accuracy, a modified dynamic lumped element model(DLEM) was proposed with time-varying equivalent circuits, which can characterize the nonlinear behaviors of piezoelectric printhead. The proposed method was then applied to investigate the influences of various waveform parameters on droplet volume and velocity of nano-silver ink, and to predict the printing quality using nano-silver ink. Experimental results show that, compared with two-dimension manual search, the proposed optimal prediction model perform efficiently and accurately in searching the appropriate combination of waveform parameters for printable electronics fabrication.展开更多
Photopolymers （printing flexoforms） during their operation interact with solvents and properties and ultimately reduces printing quality. A purpose of the work was to study the photopolymer with low-molecular liquid...Photopolymers （printing flexoforms） during their operation interact with solvents and properties and ultimately reduces printing quality. A purpose of the work was to study the photopolymer with low-molecular liquids by two independent methods （chromatography and mathematical model of the process the thermodynamic properties and Flory-Huggins polymer-solvent systems. swell. Swelling changes the elastic thermodynamics of interaction of swelling in solvents）. By using a parameters were determined for展开更多
In this study, indoor air quality （IAQ） assessments were carried out in a screen printing facility. The air sampling was conducted in press department, including two different types of screen printing machines： sem...In this study, indoor air quality （IAQ） assessments were carried out in a screen printing facility. The air sampling was conducted in press department, including two different types of screen printing machines： semi-automatic and automatic. Air samples were collected and analyzed in situ for 4 times, once per 2 hours, during working time of 8 hours. Analysis of the experimental data showed that ambient ozone concentrations slowly increases with the increasing of TVOCs concentration and intensive use of UV lamps during automatic screen printing process. Therefore, the detected concentration levels of ozone and VOCs were compared with the Occupational Safety and Health Administration （OSHA） and Serbian Regulation. Comparison of the two mentioned standard regulations, the ozone concentrations in indoor printing air were from 0.83 to 8.1 and 2.4 to 16.2 times higher in the relation to the prescribed PEL and maximum allowed concentration （MAC） values, respectively, while the concentrations of particular VOCs were much below the PEL prescribed by the OSHA.展开更多
A method, the morphology of screen printed carbon nanotube pastes is modified using a hard hairbrush, is presented. In this way, the organic matrix material is preferentially removed. Compared to those untreated films...A method, the morphology of screen printed carbon nanotube pastes is modified using a hard hairbrush, is presented. In this way, the organic matrix material is preferentially removed. Compared to those untreated films, the turn-on electric field of the treated film decreases from 2.2V/μm to 1.6V/μm, while the total emission current of the treated increases from 0.6mA/cm2 to 3mA/cm2, and uniform emission site density image has also been observed.展开更多
It is known that the building sector consumes about 40% of earth＇s resources in their process of commissioning, erection and subsequent operation. As a consequence there is significant amount of CO2 emission to the a...It is known that the building sector consumes about 40% of earth＇s resources in their process of commissioning, erection and subsequent operation. As a consequence there is significant amount of CO2 emission to the atmosphere. Assessment of environmental performances of buildings has assumed immense significance in such backdrop and calls for assessing the ＂Carbon Footprint＂ of building systems for estimating their environmental compatibility. The present paper discusses a case specific environmental evaluation exercise by estimating the Carbon Footprint of a conventionally constructed tourist accommodation by tracking its resource consumption pattern during both the execution and operational phases in the hot and humid climatic zone of Indian sea-side. The result of the analysis is compared against the average carrying capacity of Earth to develop a method of measuring and quantifying the building＇s environmental performance with respect to Earth＇s reported threshold of tolerance and check the extent of failure or success, as the case may be. This process also leads to a tool named ＇Sustainability Quotient＇. The method of quantification is simple and can be adopted for environmental assessment of both new and old buildings.展开更多
基金Projects(2014AA052101-3,2014AA052102)supported by the National High Technology Research and Development Program of ChinaProjects(51205389,61105067)supported by the National Natural Science Foundation of China
文摘The major challenge in printable electronics fabrication is to effectively and accurately control a drop-on-demand(Do D) inkjet printhead for high printing quality. In this work, an optimal prediction model, constructed with the lumped element modeling(LEM) and the artificial bee colony(ABC) algorithm, was proposed to efficiently predict the combination of waveform parameters for obtaining the desired droplet properties. For acquiring higher simulation accuracy, a modified dynamic lumped element model(DLEM) was proposed with time-varying equivalent circuits, which can characterize the nonlinear behaviors of piezoelectric printhead. The proposed method was then applied to investigate the influences of various waveform parameters on droplet volume and velocity of nano-silver ink, and to predict the printing quality using nano-silver ink. Experimental results show that, compared with two-dimension manual search, the proposed optimal prediction model perform efficiently and accurately in searching the appropriate combination of waveform parameters for printable electronics fabrication.
文摘Photopolymers （printing flexoforms） during their operation interact with solvents and properties and ultimately reduces printing quality. A purpose of the work was to study the photopolymer with low-molecular liquids by two independent methods （chromatography and mathematical model of the process the thermodynamic properties and Flory-Huggins polymer-solvent systems. swell. Swelling changes the elastic thermodynamics of interaction of swelling in solvents）. By using a parameters were determined for
文摘In this study, indoor air quality （IAQ） assessments were carried out in a screen printing facility. The air sampling was conducted in press department, including two different types of screen printing machines： semi-automatic and automatic. Air samples were collected and analyzed in situ for 4 times, once per 2 hours, during working time of 8 hours. Analysis of the experimental data showed that ambient ozone concentrations slowly increases with the increasing of TVOCs concentration and intensive use of UV lamps during automatic screen printing process. Therefore, the detected concentration levels of ozone and VOCs were compared with the Occupational Safety and Health Administration （OSHA） and Serbian Regulation. Comparison of the two mentioned standard regulations, the ozone concentrations in indoor printing air were from 0.83 to 8.1 and 2.4 to 16.2 times higher in the relation to the prescribed PEL and maximum allowed concentration （MAC） values, respectively, while the concentrations of particular VOCs were much below the PEL prescribed by the OSHA.
文摘A method, the morphology of screen printed carbon nanotube pastes is modified using a hard hairbrush, is presented. In this way, the organic matrix material is preferentially removed. Compared to those untreated films, the turn-on electric field of the treated film decreases from 2.2V/μm to 1.6V/μm, while the total emission current of the treated increases from 0.6mA/cm2 to 3mA/cm2, and uniform emission site density image has also been observed.
文摘It is known that the building sector consumes about 40% of earth＇s resources in their process of commissioning, erection and subsequent operation. As a consequence there is significant amount of CO2 emission to the atmosphere. Assessment of environmental performances of buildings has assumed immense significance in such backdrop and calls for assessing the ＂Carbon Footprint＂ of building systems for estimating their environmental compatibility. The present paper discusses a case specific environmental evaluation exercise by estimating the Carbon Footprint of a conventionally constructed tourist accommodation by tracking its resource consumption pattern during both the execution and operational phases in the hot and humid climatic zone of Indian sea-side. The result of the analysis is compared against the average carrying capacity of Earth to develop a method of measuring and quantifying the building＇s environmental performance with respect to Earth＇s reported threshold of tolerance and check the extent of failure or success, as the case may be. This process also leads to a tool named ＇Sustainability Quotient＇. The method of quantification is simple and can be adopted for environmental assessment of both new and old buildings.
