Characterization of drop-casted graphene/cellulose thin film on printing paper substrate

Paper electronics is an emerging technology to implement flexible and wearable electronics devices via ink printing process. This paper evaluates the feasibility of using conventional printing paper for coating process with graphene/cellulose ink. 4 different types of regularly used conventional printing papers were used as substrates in this work. The conductive graphene ink was prepared through exfoliation of graphite in cellulose solution. The paper substrates surface morphology and sheet resistance of the drop-casted conductive ink on each paper were analyzed and discussed. Glossy paper was found to be suitable paper substrate for the printing of the formulated ink due to its low surface roughness of 16 nm. The value of sheet resistance of the graphene/cellulose thin film can be lowered to 4.11 kΩ/sq by applying multiple drops. This work suggests that conventional printing paper may offer solution for highly scalable and low-cost paper electronics.

Impact of kaolin on physicomechanical properties of density-graded cement bonded paperboards

Paperboards of thickness 0.6 cm with densities of 0.8, 0.9, and 1.0 g/cm3 were produced from waste papers mixed with cement and kaolin. Printing and corrugated waste papers were employed in the proportions of 50.0/25.0/25.0, 50.0/37.5/12.5, and 50.0/12.5/37.5 (paper/cement/kaolin), respectively. The dimensional and strength properties of the boards were investigated. The values obtained range from 0.40 to 0.94 g/cm3, 51.19 to 68.10%, 0.14 to 3.10%, 0.01 to 1.69 Nmm-2, and 119.98 to 567.32 Nmm-2 for observing the density, water absorption, thickness swelling, modulus of rupture, and modulus of elasticity, respectively. The board of proportion 25/25 of kaolin/cement was densest with high strength. As the nominal density and kaolin content were increased from 12.5 to 37.5%, an increase was observed in density and strength properties. Similarly, as the proportion of kaolin and cement content were increased, the rate of moisture uptake to cavity decreased. This study shows that boards from printing papers were more dimensionally stable than corrugated papers. It revealed that printing papers could be better raw material for manufacture paperboard than corrugated papers. Information provided in this study could be used as a guideline for the manufacture of paperboard reinforced with kaolin as an additional constituent for quality improvement.

On the development of the refiner mechanical pulping process – a review

This paper is a review of the development of the mechanical pulping process with focus on refiner-based processes. The intention is to provide an overview of the trends and the major advances in the development of the mechanical pulping (MP) process. The focus is on the development of the entire MP process, rather than the refiner as such. However, when discussing the MP process development, it is inevitable to consider the development of the refiner unit operation briefly. Processes for printing papers based on softwood is mainly discussed, but board processes are discussed briefly as well.

Cloud Computing Technology for Green Enterprises

Computing technology acting a very vital role in our day to day activities. Later the associated high volume of energy consumption has become a major concern every economically and environmentally. Green computing is associate rising application in computing effectively that leads to very important greenhouse gas reduction. In toughened computing has become an important half that has got to be thought of seriously by ordered generation data and communication technology designers. Green computing is to use computer and connected resources in atmosphere, friendly ways in which. Such practices embrace the implementation of energy-efficient central method unit (CPU), servers and peripheral any as finding innovative ways in which of reducing resource consumption and proper disposal of electronic waste. Many IT manufacturers and vendors endlessly invest in designing energy economical computing devices, reducing the use of dangerous material, and galvanizing the recyclability of digital devices and printing papers.

Effects of chip pretreatment and feeding segments on specific energy and pulp quality in TMP production

Increased wood softening and refining intensity have earlier been utilized to improve refining efficiency in mechanical pulping. We have evaluated a combination of increased softening by low dose sulphite chip pretreatment and increased intensity by feeding segment design in a TMP line for production of high quality printing papers. Norway spruce wood chips were preheated, compressed in an Impressafiner and impregnated with water or sodium sulphite solutions (Na2SO3 charges 3.6 and 7.2 kg/t). Chips were refined in two parallel 68” double disc refiners using two different refining conditions: standard bidirectional segments at normal production rate (9 t/h) and feeding segments at increased production rate (11.1–12.1 t/h). The feeding segments enabled a 30 % increase in production rate. Refining with feeding segments at 12.1 t/h production rate combined with chip pretreatment with 3.6 kg/t sodium sulphite reduced the specific energy 360 kWh/t (19 %) compared to refining with standard segments and no pretreatment. Pulp properties were similar for the two configurations. The combination of feeding segments and chip pretreatment with water reduced the specific energy 180 kWh/t (9 %). Implementation of most of the technology presented has reduced the electrical energy use for the mill by approximately 80 GWh/year.

Cloud Computing Technology for Green Enterprises

Computing technology acting a very vital role in our day to day activities. Later the associated high volume of energy consumption has become a major concern every economically and environmentally. Green computing is associate rising application in computing effectively that leads to very important greenhouse gas reduction. In toughened computing has become an important half that has got to be thought of seriously by ordered generation data and communication technology designers. Green computing is to use computer and connected resources in atmosphere, friendly ways in which. Such practices embrace the implementation of energy-efficient central method unit (CPU), servers and peripheral any as finding innovative ways in which of reducing resource consumption and proper disposal of electronic waste. Many IT manufacturers and vendors endlessly invest in designing energy economical computing devices, reducing the use of dangerous material, and galvanizing the recyclability of digital devices and printing papers.

Low consistency refining of mechanical pulp — system design

Many mechanical pulping mills use low consistency (LC) refining for energy efficient fiber development. In this study, energy efficiency and pulp quality were evaluated for six processes, of which four included LC refining. We studied two different types of chip refiners – single disc (SD) and double disc (DD) – with LC refining in the main and reject lines. All process combinations have been used in the Holmen Paper Braviken mill, Sweden, to make thermomechanical pulp for printing papers. LC refining was more energy efficient than high consistency (HC) refining at certain tensile index increases in all evaluated combinations. LC refining in the main line had somewhat higher energy efficiency than did LC refining in the reject line. The type of chip refiner (DD or SD) did not affect the efficiency or pulp property development in LC refining. The process with a combination of DD chip refining and LC refining had the highest energy efficiency (tensile index at certain specific energy consumption). All processes with LC refining produced pulp with somewhat lower light scattering and fiber length than did the corresponding system with only HC refining. Thus, for printing papers, the best combination was LC refining with DD chip refining. LC refiners seem to have a narrow range in specific energy for maximum energy efficiency and a good balance between tensile index increase and fiber length reduction. Much higher specific energy was applied on reject pulp. However, the reject share was only around 30%. The LC refining specific energy, based on main line production, was around 80 kWh/air-dried metric ton (a.d. metric ton), whereas up to 180 kWh/a.d. metric ton was applied in main line.

PENDATAAN ALUMNI SECARA ONLINE UNTUK MENDAPATKAN DATA TRACER ALUMNI

Tracer study is a mean to gather information of the alumni on regards to learn about their progress in career, their implementation of skills they learn in their study, and opinion about them from people who work alongside them. The importance of tracer study lies in the processing data from the alumni and producing information that can be used to increase the learning materials, learning methods, motivation of the current students, and quality of service given by the university. Collecting data from graduated University students is not an easy task. The major issue in the data gathering is the distance between the University and the data givers’ location because most of them are not grouped in areas near the campus which make them unable to directly submit the questionere to the faculty they studied. Other dificulties faced by the university which conduct tracer study are the alumni’s ocupation which prohibit them for going to University, time limit given for the alumni to submit their form, cost used for buying and printing papers, more over the form’s layout and content that consist of things that need to be skipped based on options the participant’s choice which make it confusing and dificult to gather valid data.The result of this research is an aplication that can handle the inputs of tracer study by the alumni and produce information about alumni’s progress from those inputs, especialy for those who had graduated from their alma mater for more than six months. Several improvement that can be achieved by this application caompared to the previous hand in form method are instant collecting as soon as the user press the submit button, automatic processing which can eliminate submision due date because the user can fill the form any time there is a change in their data, and automatic text and graphical reporting which can be seen anytime with real time update which can be used for producing data for decision making in the university where this application is used.Keyword : angket, alumni, UNWAHA, tracer study, online