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Search Results: 1 - 10 of 108423 matches for " Bruce Zhang "
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Progress of Modern Pyrolysis Furnace Technology  [PDF]
Guotai Zhang, Bruce Evans
Advances in Materials Physics and Chemistry (AMPC) , 2012, DOI: 10.4236/ampc.2012.24B044
Abstract: This paper presents the fundamentals of thermal pyrolysis and discusses the modern ethylene furnace technology and its design trends. Technip’s proprietary SPYRO? program is discussed for prediction of hydrocarbon cracking.
Arithmetic properties of generalized Euler numbers
Bruce E. Sagan,Ping Zhang
Mathematics , 1998,
Abstract: The generalized Euler number E_{n|k} counts the number of permutations of {1,2,...,n} which have a descent in position m if and only if m is divisible by k. The classical Euler numbers are the special case when k=2. In this paper, we study divisibility properties of a q-analog of E_{n|k}. In particular, we generalize two theorems of Andrews and Gessel about factors of the q-tangent numbers.
Modelling and Analysis of TCP Performance in Wireless Multihop Networks  [PDF]
Hannan Xiao, Ying Zhang, James Malcolm, Bruce Christianson, Kee Chaing Chua
Wireless Sensor Network (WSN) , 2010, DOI: 10.4236/wsn.201027061
Abstract: Researchers have used extensive simulation and experimental studies to understand TCP performance in wireless multihop networks. In contrast, the objective of this paper is to theoretically analyze TCP performance in this environment. By examining the case of running one TCP session over a string topology, a system model for analyzing TCP performance in multihop wireless networks is proposed, which considers packet buffering, contention of nodes for access to the wireless channel, and spatial reuse of the wireless channel. Markov chain modelling is applied to analyze this system model. Analytical results show that when the number of hops that the TCP session crosses is ?xed, the TCP throughput is independent of the TCP congestion window size. When the number of hops increases from one, the TCP throughput decreases ?rst, and then stabilizes when the number of hops becomes large. The analysis is validated by comparing the numerical and simulation results.
Evolution and significance of soil magnetism of basalt-derived chronosequence soils in tropical southern China  [PDF]
Decheng Li, Yanfang Yang, Jinping Guo, Bruce Velde, Ganlin Zhang, Feng Hu, Mingsong Zhao
Agricultural Sciences (AS) , 2011, DOI: 10.4236/as.2011.24070
Abstract: Soil samples were collected from eight basalt- derived chronosequence soils with the ages of 0.01, 0.58, 0.92, 1.33, 2.04, 3.04, 3.76 and 6.12 Ma respectively from Leizhou Peninsula and northern Hainan Island of tropical southern China. Magnetic parameters of magnetic susceptibility (MS), percentage of frequency-dependent magnetic susceptibility (FDS%), anhysteretic remanent magnetization (ARM), saturation isothermal remanent magnetization (SIRM), soft and hard isothermal remanent magnetization (IRMs and IRMh) of the collected samples were measured to study the evolution and the significance of the magnetism with soil age. The results show that the magnetic parameters changed fast from Primosols to Ferrosols (0.01 ~ 0.92 Ma) but slowly at Ferralosols stage (1.33 Ma~), it suggests a stable phase occurred for soil magnetism at Ferralosols, the existence of this phase could be supported by the little changes in the contents of clay, Fet and Fed. Obvious differences existed in the values of magnetic parameters between Ferralosols and other soil types (Primosols and Ferrosols), FDS%: Ferralosols > 10%, Primosols and Ferrosols < 10%; ARM, Ferralosols < 7000 × 10–8· SIm3·kg–1, Primosols and Ferrosols > 8000 × 10–8 SIm3·kg–1, thus, it is possible to differentiate Ferralosols from other soil types in tropical region by using magnetic indices.
Dose Perturbations of Gold Fiducial Markers in the Prostate Cancer Intensity Modulated Proton Radiation Therapy (IMPT)  [PDF]
Miao Zhang, Sung Kim, Ting Chen, Xiaohu Mo, Bruce G. Haffty, Ning J. Yue
International Journal of Medical Physics,Clinical Engineering and Radiation Oncology (IJMPCERO) , 2012, DOI: 10.4236/ijmpcero.2012.11002
Abstract: The objective of this study is to investigate the dose perturbations introduced by the implanted gold fiducial markers in the prostate cancer intensity modulated proton therapy (IMPT) and the impacts of different plan designs on the pertur-bations. Five proton plans: a single lateral field 3D-modulation (3D-mod) plan, 2 fields laterally opposing 3D-mod plan, 6-, 9-, and 18-field distal edge tracking (DET) plans were designed on the CT images of a prostate patient. The dose distributions were first generated for the plans free of fiducial markers with 78 Gy prescribed to 95% of the PTV. To derive the dose perturbations of the gold fiducial markers, three cylindrical shaped gold fiducial markers (3 mm long and 1 mm in diameter) were artificially inserted into the prostate, and the dose distributions were re-computed. Monte Carlo method was used for dose computation. It was found that the gold fiducial markers perturbed the dose distribu-tions, especially along the beam paths. The markers caused a shadowing effect reducing the doses in the areas beyond the markers. Overall, due to the presence of the fiducial markers, D99% of prostate were reduced by 2.96 Gy, 4.21 Gy, 0.16 Gy, 0.34 Gy, 0.15 Gy for the plans of single field 3D-mod, 2-field parallel opposed 3D-mod, 6-, 9-, and 18-field DET respectively. Our study showed these dose perturbation effects decreased with the increase of number of beam angles. Up to 6 beam angles may be required to reduce the dose perturbations from the gold fiducial markers to a clini- cally acceptable level in IMPT.
US Agriculture under Climate Change: An Examination of Climate Change Effects on Ease of Achieving RFS2
Yuquan W. Zhang,Bruce A. McCarl
Economics Research International , 2013, DOI: 10.1155/2013/763818
Abstract: The challenges and opportunities facing today's agriculture within the climate change context are at least twofold: in addition to adapting to a potentially more variable climate, agriculture may also take on the addition role of mitigating GHG emissions—such as providing renewable fuels to replace fossil fuels to some extent. For the US, a large-scale GHG mitigation effort through biofuels production pursuant to the Renewable Fuel Standard (RFS2) is already unfolding. A question thus naturally arises for the RFS2-relevant US agricultural sector: will climate change make it harder to meet the volume goals set in the RFS2 mandates, considering that both climate change and RFS2 may have significant impacts on US agriculture? The agricultural component of FASOMGHG that models the land use allocation within the conterminous US agricultural sector is employed to investigate the effects of climate change (with autonomous adaptation at farm level), coupled with RFS2, on US agriculture. The analysis shows that climate change eases the burden of meeting the RFS2 mandates increasing consumer welfare while decreasing producer welfare. The results also show that climate change encourages a more diversified use of biofuel feedstocks for cellulosic ethanol production, in particular crop residues. 1. Introduction Key to agricultural production, climate and the atmosphere provide essential inputs such as solar radiation, water, and CO2 for plant and animal growth [1]. Changes in climate and the atmosphere, projected by IPCC WGI [2] as inevitable for the coming decades, raise concerns regarding the adaptive ability and/or the likely responses of the agricultural sector. The challenges and opportunities facing today’s agriculture within the climate change context are, however, at least twofold: in addition to adapting to a potentially more variable climate, agriculture may also take on the additional role of mitigating GHG emissions—such as providing renewable fuels to replace fossil fuels to some extent [3]. In the US, a large-scale GHG mitigation effort through biofuels production, pursuant to the Renewable Fuel Standard (RFS2), is already unfolding. A question thus arises naturally for the RFS2-relevant US agricultural sector: will climate change make it harder to meet the volume goals set in the RFS2 mandates, considering that both climate change and RFS2 may have significant impacts on US agriculture? Current climate change studies have shown a growing interest in “synergies” between the agriculture-based mitigation and adaptation under climate change and/or
A Spitzer/IRS spectral study of a sample of galactic carbon-rich proto-planetary nebulae
Yong Zhang,Sun Kwok,Bruce J. Hrivnak
Physics , 2010, DOI: 10.1088/0004-637X/725/1/990
Abstract: Recent infrared spectroscopic observations have shown that proto-planetary nebulae (PPNs) are sites of active synthesis of organic compounds in the late stages of stellar evolution. This paper presents a study of Spitzer/IRS spectra for a sample of carbon-rich PPNs, all except one of which show the unidentified 21 micron emission feature. The strengths of the aromatic infrared band (AIB), 21 micron, and 30 micron features are obtained by decomposition of the spectra. The observed variations in the strengths and peak wavelengths of the features support the model that the newly synthesized organic compounds gradually change from aliphatic to aromatic characteristics as stars evolve from PPNs to planetary nebulae.
In-spiraling Clumps in Blue Compact Dwarf Galaxies
Bruce G. Elmegreen,Hongxin Zhang,Deidre Hunter
Physics , 2012, DOI: 10.1088/0004-637X/747/2/105
Abstract: Giant star-formation clumps in dwarf irregular galaxies can have masses exceeding a few percent of the galaxy mass enclosed inside their orbital radii. They can produce sufficient torques on dark matter halo particles, halo stars, and the surrounding disk to lose their angular momentum and spiral into the central region in 1 Gyr. Pairs of giant clumps with similarly large relative masses can interact and exchange angular momentum to the same degree. The result of this angular momentum loss is a growing central concentration of old stars, gas, and star formation that can produce a long-lived starburst in the inner region, identified with the BCD phase. This central concentration is proposed to be analogous to the bulge in a young spiral galaxy. Observations of star complexes in five local BCDs confirm the relatively large clump masses that are expected for this process. The observed clumps also seem to contain old field stars, even after background light subtraction, in which case the clumps may be long-lived. The two examples with clumps closest to the center have the largest relative clump masses and the greatest contributions from old stars. An additional indication that the dense central regions of BCDs are like bulges is the high ratio of the inner disk scale height to the scale length, which is comparable to 1 for four of the galaxies.
Extraction of Top Backgrounds in the Higgs Boson Search with the $H\rightarrow WW^{\star}\rightarrow\ell\ell+\met$ Decay with a Full-Jet Veto at the LHC
Bruce Mellado,Xifeng Ruan,Zhiqing Zhang
Physics , 2011, DOI: 10.1103/PhysRevD.84.096005
Abstract: The search for a Standard Model Higgs boson with the $H\rightarrow WW^{\star}\rightarrow\ell\ell+\met$ decay and the application of a full-jet veto yields a strong sensitivity in the mass range $130
A Bioinformatics-Inspired Adaptation to Ukkonen’s Edit Distance Calculating Algorithm and Its Applicability Towards Distributed Data Mining  [PDF]
Johnson Bruce
Journal of Software Engineering and Applications (JSEA) , 2008, DOI: 10.4236/jsea.2008.11002
Abstract: Edit distance measures the similarity between two strings (as the minimum number of change, insert or delete operations that transform one string to the other). An edit sequence s is a sequence of such operations and can be used to represent the string resulting from applying s to a reference string. We present a modification to Ukkonen’s edit distance calculating algorithm based upon representing strings by edit sequences. We conclude with a demonstration of how using this representation can improve mitochondrial DNA query throughput performance in a distributed computing environment.
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