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The existing efforts on carbon footprint studies of manufacturing processes are focused largely on emissions assessment for product compliance reporting. Relatively little attention has been given to analyzing how process properties affect these emissions for carbon footprint reduction. Going beyond assessment calculation into carbon footprint improvement, this paper presents a method for modeling...
Brought into focus by sustainable development along with related issues of resource efficiency and health hazard reduction, sustainability in industrial waste recycling is becoming an emerging area with potentials to contribute to environmental protection, economic development and social benefit. This paper examines a sustainability management approach to the development of sustainable recycling technologies...
Clock synchronization is a fundamental issue in communication networks and distributed systems, and clock skew is the inherent cause for clock desynchronization. Clock skew estimation is essential to improve the efficiency and reduce the overhead of clock synchronization schemes, and it is especially beneficial for resource-constrained devices such as sensor nodes in dynamic environments. According...
This paper focuses on activities and methodologies for information systems (IS) development projects in China. It examines key issues affecting IS development activities and investigates possible differences in practices and experiences that may result from the adoption of formal development methodologies. A survey of 73 senior information technology (IT) professionals helped identify the lack of...
Using plane wave method (PWM) combined with supercell method, Fourier extension coefficient of dielectric function for arbitrary defects in parallelogram lattice PC are derived, then the point and line defect modes of TM mode for 5times5 supercell PC with lattice angle 70deg are calculated. These results would provide theoretical instruction for designing vacuum electron devices using PC with parallelogram...
In this paper, we investigate the performance of a multiple access scheme based on orthogonal frequency-division multiplexing (OFDM) in High Altitude Platform (HAP) system for Wireless Sensor Network (WSN) applications. In our study, HAPs are used to replace the traditional gateway deployed on the ground and collect data from sensor nodes. Two scenarios of OFDM schemes with different subcarrier spacing...
The cooling tower is a significant device of the circular cooling water system in thermal power plants, whose cooling performance will directly affect the operation stability of steam-turbine unit and the efficiency of cold-end system. As the construction and development of thermal power plants, especially nuclear power plants and solar power plants, the requirement for the construction cost of cooling...
Spatial compounding has recently been introduced into modern commercial ultrasound systems. These systems are able to reduce angular dependent artifacts by averaging multiple images taken from different angles. In order to further reduce angular dependent artifacts, paired angle multiplicative compounding (PAMC) was recently introduced. The multiplication of pairs of images acquired from different...
The THz generation efficiency in two new stilbazolium salts pumped by laser sources at telecommunication wavelengths is increased compared to DAST, the benchmark material for this application.
We demonstrate four-wave-mixing with <5 mW CW pump power in high-index, doped silica glass micro-ring resonators. We also demonstrate efficient self-phase modulation for pulses with <100 W peak power, with negligible nonlinear absorption up to 25 GW/cm2.
Focusing on formal project management initiatives (PMIs) in the information technology (IT) sector in China, this paper first examines possible differences in perception about such PMIs between IT professionals who were exposed to their implementation and those who weren??t. This part of the investigation is based on an adaptation of Rogers?? theory of diffusion of innovations. Second, this paper...
In this paper, we investigate the performance of using high altitude platforms (HAPs) for low power wireless sensor network (WSN) applications. In our study, HAPs are employed to replace the sink usually deployed on the ground and collect data from sensor nodes. Two scenarios of employing the HAP as the sink in the WSN are established. Multiple sensor nodes are organized in an ad-hoc manner or in...
We report wavelength conversion of ultra-low power CW light in integrated silica glass micro-ring resonators via four-wave-mixing in the C-band, as well as strong self-phase modulation of < 100 W peak power optical pulses in a 45 cm waveguide.
In this paper, we investigate a cost-effective wireless broadband service provision from high altitude platforms (HAPs) and an economical business model design. Different deployment strategies of HAP system are illustrated in terms of a stand-alone HAP system and in collaboration with terrestrial or satellite systems. An IEEE 802.16 fixed broadband service from HAP is examined to show the effectiveness...
In this paper, we propose to use high altitude platforms (HAPs) for providing wireless broadband communication services in suburban and rural areas, which usually require a cost-effective and economical delivery of telecommunication services. Architectures for HAP communication systems are discussed in terms of service applications and cooperation with terrestrial and satellite systems. WiMax broadband...
This paper considers a service-oriented architecture for enterprise integration and collaboration using semantic Web service technologies. A hierarchically-structured software system has been designed and developed in order to address the challenge of dynamic service composition. In comparison with existing service composers, the description of each Web service in our system is enhanced with domain-specific...
We present the first demonstration of CW nonlinear optics in integrated glass waveguides. We achieve wavelength conversion via four-wave-mixing with a few mW of CW pump power in the C-band in a high-index, glass micro-ring resonator.
Novel design concepts and cutting edge results are presented for high-power AlGaN/GaN Heterostructure Field-Effect Transistor switches for power converters, control and radio-frequency applications. For power switching, the HFET design has to be different from that of power amplifiers in order to minimize the contact resistance and avoid current crowding in the metal electrodes of large-periphery...
Effective collaboration is crucial to the success of collaborative virtual enterprise (CVE), an emerging business paradigm driven by the increasing trend of globalization. In this paper, we adopt a service-oriented architecture for enterprise integration and collaboration based on Web service standards. In order to tackle the technical challenge associated with the dynamic formation of business workflows,...
The performance of novel RF switching devices using insulating gate III-nitride metal-oxide-semiconductor heterostructure field-effect transistors (MOSHFETs) is demontrated. Initial results show that there is no degradation in the transmitted powers or gate leakage current during the 200+ hours stress with +30 dBm CW input powers. Multi-gate RF switching devices that increase the isolation in the...
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