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Search Results: 1 - 10 of 186416 matches for " H. H. Lin "
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Characterization and Flotation of Sulfur from Chalcopyrite Concentrate Leaching Residue  [PDF]
H. K. Lin
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2003, DOI: 10.4236/jmmce.2003.21001
Abstract: Elemental sulfur produced by chloride leaching of sulfide ores or concentrates contains selenium and tellurium usually too high to be used in various industrial or agricultural uses. The sulfur in the leaching residue can be upgraded to 90% in grade by froth flotation and the sulfur concentration can be followed by sulfur purification and selenium and tellurium removal. The sulfur in the leaching is in a form of discrete particles with a size range of 5 to 10 microns. The sulfur particles tend to agglomerate in the pulp and hence mechanically entrap gangue minerals. With sodium silicate as the dispersant as well as the depressant for siliceous material, a sulfur concentrate of 90% in grade and 90% in recovery can be obtained with a single-stage froth flotation. The flotation reagent consumptions are minimum. The majority of chalcopyrite remains in the sulfur flotation tailings and can be readily recovered by flotation with different flotation reagents. When amyl xanthate is used, 85% of chalcopyrite can be recovered with a copper grade of 14.5% in a single-stage froth flotation. The chalcopyrite flotation concentrate can be sent back to chloride leaching circuits.
Column Leaching for Simulating Heap and In-situ Soil Remediation with Metallic Fenton Reaction  [PDF]
H. K. Lin, H. V. Luong
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2004, DOI: 10.4236/jmmce.2004.31004
Abstract: Metallic Fenton reaction was found to be more effective than classical Fenton reaction in decomposing Pentachlorophenol (PCP) in contaminated soil. The combination of metallic iron and hydrogen peroxide was used in column leaching experiments to simulate heap and in-situ soil remediation. PCP in the contaminated soil was effectively decomposed by 32% in 24 hours leaching tests, and by 41% in 48 hours leaching experiments. PCP destruction was further increased to 52% in the 48 hours leaching by lowering the solution pH to 1.8. Other than ferric oxide and carbon dioxide, no byproducts were found at the end of the reaction.
Application for Superconvergence of Finite Element Approximations for the Elliptic Problem by Global and Local L2-Projection Methods  [PDF]
Rabeea H. Jari, Lin Mu
American Journal of Computational Mathematics (AJCM) , 2012, DOI: 10.4236/ajcm.2012.24034
Abstract: Numerical experiments are given to verify the theoretical results for superconvergence of the elliptic problem by global and local L2-Projection methods.
An IEEE 1547-Based Power Conditioner Test System for Distributed Energy Resources  [PDF]
Azen Y. Liu, P. H. Lan, H. H. Lin
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B181
Abstract:

Power conditioner, that is responsible for electric power conversion, is a critical component used in many renewable energy power generation systems. Most of the electric power produced by distributed energy resources cannot directly import to utility network without power conversion. Meanwhile, power conversion may includes several different types, for example AC/DC, and DC/AC, which is realized by a variety types of power conditioners in the electric power system. Currently, many concerns are focused on the operation of these power conditioners used in distributed energy resources due to the worse designing may cause the terrible influence on safety and performance characteristic of distributed energy resources. The power quality and reliability of interconnected electric power network may be affected as well. In the view of this, IEEE standards board provides a uniform standard for interconnection of distributed resources with electric power systems. It provides requirements relevant to the performance, operation, testing, safety considerations, and maintenance of the interconnection. Based on the IEEE 1547 standard, this paper presents a test system for power conditioners that are used in distributed energy resources or other renewable energy applications. Some of the test items that described in IEEE 1547.1 relevant to interconnection issues can be realized by proposed test system.

Corrigendum to "Earth's Critical Zone and hydropedology: concepts, characteristics, and advances" published in Hydrol. Earth Syst. Sci., 14, 25–45, 2010
H. Lin
Hydrology and Earth System Sciences (HESS) & Discussions (HESSD) , 2010,
Abstract: No abstract available.
Earth's Critical Zone and hydropedology: concepts, characteristics, and advances
H. Lin
Hydrology and Earth System Sciences (HESS) & Discussions (HESSD) , 2010,
Abstract: The Critical Zone (CZ) is a holistic framework for integrated studies of water with soil, rock, air, and biotic resources in the near-surface terrestrial environment. This most heterogeneous and complex region of the Earth ranges from the vegetation top to the aquifer bottom, with a highly variable thickness globally and a yet-to-be clearly defined lower boundary of active water cycle. Interfaces among different compartments in the CZ are critical, which provide fertile ground for interdisciplinary research. The reconciliation of coupled geological and biological cycles (vastly different in space and time scales) is essential to understanding the complexity and evolution of the CZ. Irreversible evolution, coupled cycling, interactive layers, and hierarchical heterogeneity are the characteristics of the CZ, suggesting that forcing, coupling, interfacing, and scaling are grand challenges for advancing CZ science. Hydropedology – the science of the behaviour and distribution of soil-water interactions in contact with mineral and biological materials in the CZ – is an important contributor to CZ study. The pedosphere is the foundation of the CZ, which represents a geomembrance across which water and solutes, as well as energy, gases, solids, and organisms are actively exchanged with the atmosphere, biosphere, hydrosphere, and lithosphere, thereby creating a life-sustaining environment. Hydropedology emphasizes in situ soils in the landscape setting, where distinct pedogenic features and soil-landscape relationships are essential to understanding interactive pedologic and hydrologic processes. Both CZ science and hydropedology embrace an evolutionary and holistic worldview, which offers stimulating opportunities through steps such as integrated systems approach, evolutionary mapping-monitoring-modeling framework, and fostering a global alliance. Our capability to predict the behaviour and evolution of the CZ in response to changing environment can be significantly improved if cross-site scientific comparisons, evolutionary treatment of organized complex systems, and deeper insights into the CZ can be made.
Universal method of strictly calculating self-consistent fields of realistic plasma particles
H. Lin
Physics , 2010,
Abstract: A universal method of strictly calculating self-consistent fields of realistic plasma particles could be strictly derived from three basic tools in theoretical plasma physics: particle simulation, Vlasov-Maxwell theory and fluid theory.
Exact solutions of macroscopic self-consistent electromagnetic fields and microscopic distribution of Vlasov-Maxwell system
H. Lin
Physics , 2014,
Abstract: Strict mathematics reveals that the strict solution of a Vlasov-Maxwell equation set cannot be of a zero-temperature mathematical form. This universal property of Vlasov-Maxwell system can lead to a closed equation set of three macroscopic quantities: selfconsistent fields E, B and fluid velocity u, and hence their exact solutions.Strict solution of microscoipc distribution governed by self-consistent electromagnetic fields is found to be a universal extension of well-known BGK mode, which corresponds to electrostatic case.
Investigation of Thermal Characterization of a Thermally Enhanced FC-PBGA Assembly  [PDF]
C. F. Lin, G. H. Wu, S. H. Ju
Journal of Electronics Cooling and Thermal Control (JECTC) , 2013, DOI: 10.4236/jectc.2013.33010
Abstract:

In this paper, three-dimensional finite element analysis using the commercial ANSYS software is performed to study the thermal performance of a thermally enhanced FC-PBGA (flip-chip plastic ball grid array) assembly in both natural and forced convection environments. The thermally enhanced FC-PBGA assembly is a basic FC-PBGA assembly with a lid attached on top, after which an extruded-fin heatsink is attached on the top of the lid. The finite element model is complete enough to include key elements such as bumps, solder balls, substrate, printed circuit board, extruded-fin heatsink, lid, vias, TIM1 (thermal interface material 1), TIM2 (thermal interface material 2), lid-substrate adhesive and ground planes for both signal and power. Temperature fields are simulated and presented for several package configurations. Thermal resistance is calculated to characterize and compare the thermal performance by considering alternative design parameters of the polymer-based materials and the thermal enhancement components. The polymer-based materials include underfill, TIM1, TIM2, lid-substrate adhesive and substrate core material. The specific thermal enhancement components are the extruded-fin heatsink and the lid.

Risk Factors for Obesity and Time Frame of Weight Gain in Non-Irradiated Survivors of Pediatric Acute Lymphoblastic Leukemia  [PDF]
Maheen Hassan, Carol H. Lin, Lilibeth Torno
Journal of Cancer Therapy (JCT) , 2013, DOI: 10.4236/jct.2013.41017
Abstract:

Background: Obesity has been described among survivors of pediatric Acute Lymphoblastic Leukemia (ALL), especially those who have received cranial radiation. This study aims to evaluate the prevalence of overweight or obesity in pediatric ALL survivors who were not exposed to radiation, identify the time frame in which the rate of obesity rise is the greatest, and identify contributing clinical and treatment variables. Methods: In this retrospective, single institution study, the charts of 132 ALL survivors were reviewed. Odds Ratios (OR) and 95% Confidence Intervals (CI) were calculated for being overweight or obese at their 2 year follow-up for the following clinical variables: ethnicity, age at diagnosis, and weight at diagnosis. Changes in BMI percentiles between 4 different time points were assessed using t-test comparison and p values. Results: Survivors of ALL were more likely to be overweight or obese than the general population at the 2 and 5 year follow-up. White and Hispanic ethnicity and being overweight or obese at diagnosis were also risk factors for being overweight or obese 2 years after the end of treatment. When looking at the time frame of weight gain, survivors had a significant increase in BMI percentile between diagnosis and end of therapy, and between diagnosis and 2 year follow-up, but did not have a significant increase between end of therapy and 2 year follow-up. Conclusion: Patients with ALL have an increased risk of being obese at follow-up. They show early weight gain, between diagnosis and end of treatment, and remain overweight/obese long term. Ethnicity and BMI weight category at diagnosis were significant influences. A strategic plan to prevent this weight gain should be implemented early during therapy.

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