In this paper, the carbon nanotubes (CNTs) are synthesized on the micro graphite flakes using mixtures of C 2 H 2 and H 2 gases by thermal chemical vapor deposition. We spin the graphite solution on the silicon wafer ...
In this paper, the carbon nanotubes (CNTs) are synthesized on the micro graphite flakes using mixtures of C 2 H 2 and H 2 gases by thermal chemical vapor deposition. We spin the graphite solution on the silicon wafer and dry it, then synthesize the CNTs on the graphite flakes. The synthetic process is a catalyst free technique and the CNTs have no metal inside, so this is an easier technique for synthesizing the CNTs. We change the synthetic time to obtain the optimal conditions for synthesis of the CNTs. The experimental results show that the density and quality of the CNTs could be controlled significantly by the synthetic time. Besides, the field emission properties of the CNTs are also affected greatly by it. The emission current density of the CNTs is 0.5 mA/cm 2 at 3 V/μm, and the turn on field is 2.3 V/μm.
The purpose of this paper is to fabricate nano-crystalline graphite (NCG) material by reactive R.F. magnetron sputtering deposition, then scrape the NCG films to create NCG powder, and finally manufacture this into NC...
The purpose of this paper is to fabricate nano-crystalline graphite (NCG) material by reactive R.F. magnetron sputtering deposition, then scrape the NCG films to create NCG powder, and finally manufacture this into NCG paste. When depositing the NCG films, the atomic hydrogen from hydrogen and methane was introduced to increase the surface roughness of the NCG films, etch the NCG films to create the NCG sheet structure. It was found that the electron field emission properties are not affected through the heat treatment process during screen-printing. The NCG emitter patterns were manufactured successfully on cathode by printing the NCG paste. The current density of the emission site is 340.1 μA/cm 2 at 11 V/μm.
The aspartic protease cathepsin E has been shown to induce apoptosis in cancer cells under physiological conditions. Therefore, cathepsin E-activity-enhancing peptides functioning in the physiological pH range are val...
The ABET criteria for engineeringprograms include that students should have "an ability to apply mathematics, science and engineering", "an ability to design a system, component, or process to meet des...
详细信息
The ABET criteria for engineeringprograms include that students should have "an ability to apply mathematics, science and engineering", "an ability to design a system, component, or process to meet desired needs", "an ability to identify, formulate and solve engineering problems", and "an ability to communicate effectively", and "a knowledge of contemporary issues"1. One manner of integrating teamwork and engineering contexts in undergraduateengineering is through the educational construct of Model-Eliciting Activities (MEAs). MEAs are a class of interdisciplinary problems designed to simulate authentic, client-driven situations in classroom settings. MEAs allow teachers and researchers to observe student development of conceptual models by requiring students to make their models explicit through design-test-revise cycles. The solution of an MEA requires the use of one or more mathematical or engineering concepts that are unspecified by the problem - students must make new sense of their existing knowledge and understandings to formulate a generalizable mathematical model that can be used by the client to solve the given and similar problems. An MEA creates an environment in which skills beyond mathematical abilities are valued because the focus is not on the use of prescribed equations and algorithms but on the use of a broader spectrum of skills required for effective engineering problem solving. Carefully constructed MEAs can begin to prepare students to communicate and work effectively in teams;to adopt and adapt conceptual tools;to construct, describe, and explain complex systems;and to cope with complex systems. MEAs provide a learning environment that is tailored to a more diverse population than typical engineering course experiences as they allow students with different backgrounds and values to emerge as talented, and that adapting these types of activities to engineering courses has the potential to go beyond "filling the gaps" to "opening doors" to wom
This research is about the analysis and design of variable-wheelbase bike. Aiming to the existing folding bike of all kinds, we collect patent communiqué and record information to classify the documents and give ...
详细信息
This research is about the analysis and design of variable-wheelbase bike. Aiming to the existing folding bike of all kinds, we collect patent communiqué and record information to classify the documents and give analysis of its merit and defect. We find the way of innovative design from the generalizing information. Finally, we choose multiple-linkage mechanism system to change the positions of seat, handle bar and rear wheel, which can also alter the riding position and control ability of user. In order to lower the cost, we reduce the numbers of linkages. This linkages system must be one freedom . Therefore, this research is proceeding the mechanical sustainable synthesizing with this design iuput, and develops a multiple-linkages mechanism system with 8 bares, 10 joints with one freedom to be the construction of bike frame. Then, we synthesizing the dimensions of bike frame by SolidWorks,and stimulating sporting motion and interference by the 3D CAD model, later, evaluate whether the 3D dummy meets the requirements or not. It will also make the CAE to proceed the stress analysis of the bike frame construction with ANSYS11. 0 to make sure the strength and security. Finally, may be we would make a prototype.
The majority of visual impairments are related to retinal disorders. Therefore, techniques useful for early detection of retinal anomalies are of great interest for diagnosis and treatment of related pathologies. Opti...
详细信息
暂无评论