Cost Effective, High Efficiency Integrated Systems Approach to Auxilliary Electric Motors

Kerf loss silicon was used for additive-mediated rapid hydrogen production with a rate of 4.72 × 10−3g(H2) per s per g(Si) and a yield of 92%. A silicon-based integrated system for electricity generation and hydrogen storage was demonstrated.

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Beyond Public and Private in International Investment Law: An Integrated Systems Approach

SSRN Electronic Journal ◽

10.2139/ssrn.2144019 ◽

2012 ◽

Cited By ~ 1

Author(s):

Julie A. Maupin

Keyword(s):

Systems Approach ◽

International Investment ◽

Integrated Systems ◽

Public And Private ◽

International Investment Law ◽

Investment Law

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Chemical Modification of Combusted Coal Gangue for U(VI) Adsorption: Towards a Waste Control by Waste Strategy

Sustainability ◽

10.3390/su13158421 ◽

2021 ◽

Vol 13 (15) ◽

pp. 8421

Author(s):

Yuan Gao ◽

Jiandong Huang ◽

Meng Li ◽

Zhongran Dai ◽

Rongli Jiang ◽

...

Keyword(s):

Structural Analysis ◽

High Efficiency ◽

Low Cost ◽

Chemical Activation ◽

Cost Effective ◽

Coal Gangue ◽

Order Kinetic ◽

Practical Applications ◽

Detailed Structural Analysis ◽

Alkaline Conditions

Uranium mining waste causes serious radiation-related health and environmental problems. This has encouraged efforts toward U(VI) removal with low cost and high efficiency. Typical uranium adsorbents, such as polymers, geopolymers, zeolites, and MOFs, and their associated high costs limit their practical applications. In this regard, this work found that the natural combusted coal gangue (CCG) could be a potential precursor of cheap sorbents to eliminate U(VI). The removal efficiency was modulated by chemical activation under acid and alkaline conditions, obtaining HCG (CCG activated with HCl) and KCG (CCG activated with KOH), respectively. The detailed structural analysis uncovered that those natural mineral substances, including quartz and kaolinite, were the main components in CCG and HCG. One of the key findings was that kalsilite formed in KCG under a mild synthetic condition can conspicuous enhance the affinity towards U(VI). The best equilibrium adsorption capacity with KCG was observed to be 140 mg/g under pH 6 within 120 min, following a pseudo-second-order kinetic model. To understand the improved adsorption performance, an adsorption mechanism was proposed by evaluating the pH of uranyl solutions, adsorbent dosage, as well as contact time. Combining with the structural analysis, this revealed that the uranyl adsorption process was mainly governed by chemisorption. This study gave rise to a utilization approach for CCG to obtain cost-effective adsorbents and paved a novel way towards eliminating uranium by a waste control by waste strategy.

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Optical spin-symmetry breaking for high-efficiency directional helicity-multiplexed metaholograms

Microsystems & Nanoengineering ◽

10.1038/s41378-020-00226-x ◽

2021 ◽

Vol 7 (1) ◽

Author(s):

Muhammad Ashar Naveed ◽

Muhammad Afnan Ansari ◽

Inki Kim ◽

Trevon Badloe ◽

Joohoon Kim ◽

...

Keyword(s):

High Efficiency ◽

Spin Symmetry ◽

Cost Effective ◽

Dielectric Materials ◽

Additional Degree ◽

Cost Effective Alternative ◽

Spin Orbit Interactions ◽

Smart Mobile ◽

The Cost ◽

Hydrogenated Amorphous

AbstractHelicity-multiplexed metasurfaces based on symmetric spin–orbit interactions (SOIs) have practical limits because they cannot provide central-symmetric holographic imaging. Asymmetric SOIs can effectively address such limitations, with several exciting applications in various fields ranging from asymmetric data inscription in communications to dual side displays in smart mobile devices. Low-loss dielectric materials provide an excellent platform for realizing such exotic phenomena efficiently. In this paper, we demonstrate an asymmetric SOI-dependent transmission-type metasurface in the visible domain using hydrogenated amorphous silicon (a-Si:H) nanoresonators. The proposed design approach is equipped with an additional degree of freedom in designing bi-directional helicity-multiplexed metasurfaces by breaking the conventional limit imposed by the symmetric SOI in half employment of metasurfaces for one circular handedness. Two on-axis, distinct wavefronts are produced with high transmission efficiencies, demonstrating the concept of asymmetric wavefront generation in two antiparallel directions. Additionally, the CMOS compatibility of a-Si:H makes it a cost-effective alternative to gallium nitride (GaN) and titanium dioxide (TiO2) for visible light. The cost-effective fabrication and simplicity of the proposed design technique provide an excellent candidate for high-efficiency, multifunctional, and chip-integrated demonstration of various phenomena.

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Using off-grid hydropower for community-led flood resilience: an integrated systems approach

International Journal of Sustainable Energy ◽

10.1080/14786451.2021.1961773 ◽

2021 ◽

pp. 1-15

Author(s):

Spyros Schismenos ◽

Garry J. Stevens ◽

Dimitrios Emmanouloudis ◽

Nichole Georgeou ◽

Surendra Shrestha ◽

...

Keyword(s):

Systems Approach ◽

Integrated Systems

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Sustainable Ventilation Strategies for a Medium-Sized Space with Regional Effect

Sustainability ◽

10.3390/su13094651 ◽

2021 ◽

Vol 13 (9) ◽

pp. 4651

Author(s):

Ming-Lun Alan Fong

Keyword(s):

Life Cycle ◽

Life Cycle Cost ◽

Co2 Emission ◽

High Efficiency ◽

Regional Climate ◽

Cost Effective ◽

Regional Effect ◽

Climate Conditions ◽

Ventilation Strategies ◽

Set Up

The analysis of ventilation strategies is fundamentally affected by regional climate conditions and local cost databases, in terms of energy consumption, CO2 emission and cost-effective analysis. A systematic approach is covered in this paper to estimate a local economic and environmental impact on a medium-sized space located in two regions during supply-and-installation and operation phases. Three ventilation strategies, including mixing ventilation (MV), displacement ventilation (DV) and stratum ventilation (SV) were applied to medium-sized air-conditioned space with this approach. The trend of the results for three ventilation systems in the life cycle assessment (LCA) and life cycle cost (LCC) analysis is SV < DV < MV. The result of CO2 emission and regional LCC shows that SV is the lowest one in both regional studies. In comparison with the Hong Kong Special Administrative Region (HKSAR) during 20 Service years, the case analysis demonstrates that the percentage differences in LCC analysis of MV, DV & SV in Guangdong are less than 20.5%, 19.4% and 18.82% respectively. Their CO2 emission of MV, DV and SV in Guangdong are more than HKSAR in 10.69%, 11.22% and 12.05%, respectively. The present study could provide information about regional effects in the LCA and LCC analysis of three ventilation strategies emissions, and thereby help set up models for decision-making on high efficiency and cost-effective ventilation strategy plans.

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Solar Thermophotovoltaic Converters Based on Tungsten Emitters

Journal of Solar Energy Engineering ◽

10.1115/1.2734576 ◽

2006 ◽

Vol 129 (3) ◽

pp. 298-303 ◽

Cited By ~ 27

Author(s):

V. M. Andreev ◽

A. S. Vlasov ◽

V. P. Khvostikov ◽

O. A. Khvostikova ◽

P. Y. Gazaryan ◽

...

Keyword(s):

Band Gap ◽

High Efficiency ◽

Radiation Spectrum ◽

Cost Effective ◽

Fresnel Lens ◽

Photocurrent Density ◽

Back Side ◽

High Concentration ◽

Emitter System ◽

Solar Powered

Results of a solar thermophotovoltaic (STPV) system study are reported. Modeling of the STPV module performance and the analysis of various parameters influencing the system are presented. The ways for the STPV system efficiency to increase and their magnitude are considered such as: improvement of the emitter radiation selectivity and application of selective filters for better matching the emitter radiation spectrum and cell photoresponse; application of the cells with a back side reflector for recycling the sub-band gap photons; and development of low-band gap tandem TPV cells for better utilization of the radiation spectrum. Sunlight concentrator and STPV modules were designed, fabricated, and tested under indoor and outdoor conditions. A cost-effective sunlight concentrator with Fresnel lens was developed as a primary concentrator and a secondary quartz meniscus lens ensured the high concentration ratio of ∼4000×, which is necessary for achieving the high efficiency of the concentrator–emitter system owing to trap escaping radiation. Several types of STPV modules have been developed and tested under concentrated sunlight. Photocurrent density of 4.5A∕cm2 was registered in a photoreceiver based on 1×1cm2GaSb cells under a solar powered tungsten emitter.

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