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Search Results: 1 - 10 of 68749 matches for " Jun Lu "
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NAPL Occurrences at an Industrial Site: Creosote or Petroleum Hydrocarbons?  [PDF]
Jun Lu, Barbara Oslund
Journal of Environmental Protection (JEP) , 2018, DOI: 10.4236/jep.2018.95037
Abstract: A creosote bulk storage and transfer facility operated for at least 60 years (until the early 1990’s) on real estate leased from a railroad. The former facility (the Site) and surrounding properties have over a century of industrial use including large volume bulk storage of petroleum hydrocarbons such as No. 6 (heavy) fuel oil. Creosote storage occurred locally at the Site. Over the years differing non-aqueous phase liquid (NAPL) products have co-mingled on the Site, posing the need for differentiation between hydrocarbons common to both petroleum and creosote. In 2013 and 2016, known creosote source samples were collected from monitoring and recovery wells and soil. These samples were intended to provide comparison with property line locations that are potentially affected by petroleum (suspected No. 6 fuel oil) and/or creosote. Forensic analyses include GC/FID chromatograms, GC/MS biomarker analysis and extended PAH analysis. Each set of data revealed diagnostic characteristics of the products of interest. Combined with Site and surrounding facility operational history and hydrogeology, it was concluded that petroleum product (No. 6) fuel was present in property line wells and was believed to originate from the neighboring facility. The study not only supported liability allocation issues, but also contributed to understanding the dissolved phase plume characteristics.
A Review of the Classification of Enterprise Life Cycle  [PDF]
Xin Lu, Jun Wang
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.97076
Abstract: Due to the different life cycles of companies, there are significant differences in company size, growth, financing constraints, financing channels, growth, investment opportunities, competitive environment, and operational and financial risks. The company’s life cycle can be studied by micro-enterprises. Scholars in the fields of behavior, financial accounting, management accounting, and capital markets provide a dynamic perspective. Therefore, how to divide and measure the life cycle of a company is particularly important. This paper gives a detailed analysis of the division of the life cycle of domestic and foreign companies and their measurement methods. It has a certain guiding significance for interdisciplinary research in financial accounting, management accounting, and capital markets based on the enterprise life cycle theory.
Fuzzy Regression Model Based on Fuzzy Distance Measure  [PDF]
Jun Deng, Qiujun Lu
Journal of Data Analysis and Information Processing (JDAIP) , 2018, DOI: 10.4236/jdaip.2018.63008
Abstract: Some existed fuzzy regression methods have some special requirements for the object of study, such as assuming the observed values as symmetric triangular fuzzy numbers or imposing a non-negative constraint of regression parameters. In this paper, we propose a left-right fuzzy regression method, which is applicable to various forms of observed values. We present a fuzzy distance and partial order between two left-right (LR) fuzzy numbers and we let the mean fuzzy distance between the observed and estimated values as the mean fuzzy error, then make the mean fuzzy error minimum to get the regression parameter. We adopt two criteria involving mean fuzzy error (comparative mean fuzzy error based on partial order) and SSE to compare the performance of our proposed method with other methods. Finally four different types of numerical examples are given to illustrate that our proposed method has feasibility and wide applicability.
Investigation of the Source Relationship between Benzene Vapor and Alkylate-Containing Light Non-Aqueous Phase Liquid at Adjacent Industrial Facilities  [PDF]
Frank S. Muramoto, Jun Lu
Journal of Environmental Protection (JEP) , 2018, DOI: 10.4236/jep.2018.95036
Abstract: This study describes the investigations undertaken at two adjacent properties for known contaminants of concern and for resolution of other “unexpected” contaminant sources. One property is a manufacturing facility with impacts from chlorinated solvent compounds releases at the site. During site investigations, benzene was found present in subslab and multi-depth soil vapor probes installed beneath the basement floor of on-site buildings. Additional investigations at the manufacturing site were initiated in response to a recent, unexpected appearance of an unknown light non-aqueous phase liquid (LNAPL) in three on-site perched water zone wells as observed during sequential quarterly monitoring events and in a soil vapor extraction well. The other property is an adjacent petroleum facility that has ongoing LNAPL recovery operations from past releases at its site. A claim was made that benzene vapor at the manufacturing property was solely related to the LNAPL that migrated onto the facility. Multiple lines of evidence, including LNAPL migration pathways and chemical fingerprints, were used to show that the LNAPL was sourced from the petroleum facility. Further, benzene vapor present in subslab vapor probes installed for vapor intrusion purposes was believed to be sourced from the LNAPL and not from historical operations at the manufacturing facility. However, detailed analysis of vapor distributions, the subsurface stratigraphy, and LNAPL characteristics indicate that spills during past operations at the manufacturing facility itself were likely the source of the benzene vapor found in the subslab vapor probes.
Subsurface Gasoline “Blending” and Forensic Implications  [PDF]
Jun Lu
Journal of Environmental Protection (JEP) , 2017, DOI: 10.4236/jep.2017.86046
Abstract: At petroleum refining facilities with a long operational history, it is likely that some products were released to the subsurface and migrated to the water table. At or near the water table, these products might have commingled with a pre-existing light non-aqueous phase liquid (LNAPL) plume(s). Depending on the types of products involved and site hydrodynamics, commingling might result in the formation of a “new” LNAPL that exhibits similar characteristics to products that were manufactured via intentional blending by refinery operations. This study presents a case in which subsurface commingling of two intermediate gasoline-range products occurred at a petroleum refinery. The commingled “new” product appears almost identical to finished gasoline. As the intermediate stream products are typically sourced from refinery and finished products from either refinery or other sources (e.g., pipeline corridors), distinction of the commingled gasoline intermediate stream product from finished gasoline becomes critical not only for resolving liability issues, but also development of a remedial strategy. In this study, the source relationship between the gasoline-range intermediate stream product and finished gasoline was resolved using multiple lines of evidence including a gasoline additive, LNAPL chromatograms, diagnostic compounds (biomarkers) and ratios, and site LNAPL hydrodynamics.
Wave mechanics in quantum phase space: hydrogen atom
LU Jun,

自然科学进展 , 2007,
Abstract: The rigorous solutions of the stationary Schrodinger equation for hydrogen atom are solved with the wave-mechanics method within the framework of the quantum phase-space representation established by Torres-Vega and Frederick. The "Fourier-like" projection transformations of wave function from the phase space to position and momentum spaces are extended to three-dimensional systems. The eigenfunctions in general position and momentum spaces could be obtained through the transformations from eigenfunction in the phase space.
The Evaluation of Enterprises’ Sustainable Superiority Degree of Technical Innovation Based on DEA Method  [PDF]
Bing Jiang, Lu Yang, Jun Fang
Journal of Service Science and Management (JSSM) , 2008, DOI: 10.4236/jssm.2008.13028
Abstract: The paper at first expounds two new concepts of sustainability degree and superiority degree, and founds a method of DEA of relative efficiency index to rank all decision-making-units having been identified efficient. On the basis of them, the definition and arithmetic are given to analyze them. Then seven input and output techno-innovation indexes which belong to six automobile listed companies from 2002 to 2005 are used to evaluate enterprises’ sustainability degree and superiority degree by vertical and horizontal calculation based on DEA method. At last, we get general conclusions about enterprises’ sustainable superiority degree by weighting calculation.
Acetylcholine participates in pain modulation by influencing endogenous opiate peptides in rat spinal cord  [PDF]
Jun Yang, Ying Zhao, Yanjuan Pan, Guangzhou Lu, Lu Lu, Daxin Wang, Jingcheng Wang
World Journal of Neuroscience (WJNS) , 2012, DOI: 10.4236/wjns.2012.21003
Abstract: The spinal cord is a necessary pathway that transfers the body nociceptive inputs to the brain, and endo-genous opiate peptides (EOP) play an important role in pain modulation. Our previous work has proven that arginine vasopressin (AVP) antinociception in the caudate nucleus (CdN) relates with the acetylcholine (Ach) system mainly. The communication was de-signed to investigate the interrelations between Ach system and EOP system at the spinal level during pain process. The results showed that: 1) pain stimulation increased L-enkephalin (L-Ek), β-endorphin (β-Ep), dynorphin A1-13(DynA1-13), Ach and choline (Ch, an Ach metabolic product) concentrations in the spinal cord; 2) Ach increased L-Ek, β-Ep and DynA1-13 concentrations in the spinal cord; and 3) Atropine (M-receptor inhibitor) or hexahydric gallamine (N-receptor inhibitor) decreased L-Ek, β-Ep and DynA1-13 concentrations in the spinal cord. The data suggested that Ach antinociception was involved in the EOP system at the spinal level.
A Theorem of Nehari Type on Weighted Bergman Spaces of the Unit Ball
Yufeng Lu,Jun Yang
Abstract and Applied Analysis , 2008, DOI: 10.1155/2008/538573
Abstract: This paper shows that if is a bounded linear operator acting onthe weighted Bergman spaces 2 on the unit ball in ? such that =(=1,…,), where = and=(); and where is the weighted Bergman projection, then must be a Hankel operator.
Prediction for human transcription start site using diversity measure with quadratic discriminant
Jun Lu,Liaofu Luo
Bioinformation , 2008,
Abstract: The accurate identification of promoter regions and transcription start sites is a challenge to the construction of human transcription regulation networks. Thus, an efficient prediction method based on theoretical formulation is necessary for this purpose. We used the method of increment diversity with quadratic discriminant analysis (IDQD) to predict transcription start sites (TSS). The method produced sensitivity and positive predictive value of more than 65% with positives to negatives ratio of 1:58. The performance evaluation using Receiver Operator Characteristics (ROC) showed an auROC (area under ROC) of greater than 96%. The evaluation by Precision Recall Curves (PRC) showed an auPRC (area under PRC) of about 26% for positives to negatives ratio of 1:679 and about 64% for positives to negatives ratio of 1:113. The results documented in this approach are either better or comparable to other known methods.
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