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Search Results: 1 - 10 of 54641 matches for " Juan Zheng "
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Cloud and Open BIM-Based Building Information Interoperability Research  [PDF]
Du Juan, Qin Zheng
Journal of Service Science and Management (JSSM) , 2014, DOI: 10.4236/jssm.2014.72005
Abstract:

The emergence of Open BIM effectively improves the interoperability of building information. Besides, cloud technology supports virtualization and QoA (Quality of Assurance) in the case of the distributed system and multi-user collaboration. Based on the cloud and the Open BIM, this paper puts forward the cloud services models and the cloud-based Open BIM building information interaction framework, and further illustrates the architecture of cloud deployment pattern and the information interaction process. Finally, the paper takes underground rail transit project as example and explains how to deploy and implement the tunnel construction management platform.

Lithium diaquanickel(II) catena-borodiphosphate(V) monohydrate
Juan Zheng,Aiyun Zhang
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809014652
Abstract: The title borophosphate LiNi(H2O)2[BP2O8]·H2O was synthesized under hydrothermal conditions. The crystal structure is isotypic with the Mg analogue and features helical [BP2O8]3 borophosphate ribbons, constructed by BO4 (2 symmetry) and PO4 tetrahedra. The borate groups share all their oxygen apices with adjacent phosphate tetrahedra. The ribbons are connected via Ni2+ cations that are located on twofold rotation axes. The cations have a slightly distorted octahedral oxygen coordination by four O atoms from the anion and by two water molecules. The voids within the helices are occupied by Li+ cations, likewise located on twofold rotation axes, in an irregular environment of five O atoms. The structure is stabilized by O—H...O hydrogen bonds between coordinated or uncoordinated water molecules and O atoms that are part of the helices.
An open-framework borophosphate, LiCu2BP2O8(OH)2
Juan Zheng,Aiyun Zhang
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809015554
Abstract: The open-framework alkaline-earth metal borophosphate, lithium dicopper(II) borophosphate dihydroxide, LiCu2BP2O8(OH)2, was synthesized hydrothermally. Its structure may be regarded as a layer formed via BO4 and PO4 tetrahedra bonding together with distorted CuO6 and LiO6 octahedral units. Each P atom is connected to B, Li and Cu atoms through a bridging O atom. The B atom lies on a crystallographic twofold axis and the Li atom lies on a center of symmetry. The two metal centers are connected to each other by Cu—O—Li bonds.
Analysis of the Real Estate Enterprise’s Core Competitiveness Based on Sustainable Development
Liwen ZHENG,Juan ZHANG
Management Science and Engineering , 2011, DOI: 10.3968/j.mse.1913035x20110503.4z495
Abstract: In China, the real estate industry has attracted great attention which healthy development or is of great of significance to build harmonious society. Otherwise, currently the majority in the industry as a whole is small developers, and there is a big gap in the core competitiveness, which has decisive influence on the future development of this industry. This article analysis the core competitiveness situation of the real estate and put forward the strategy based on the sustainable development for real estate enterprises. Key words: Sustainable development; Real-estate; Core competitiveness
Research on Green Logistics System Based on Circular Economy
Liwen Zheng,Juan Zhang
Asian Social Science , 2010, DOI: 10.5539/ass.v6n11p116
Abstract: The development of cycle economic needs green of the area of material flow, green logistics is the main development trends of modern logistics. This paper explains the circular economy and the relationship between green logistics, using foreign concept of circular economy development of the green practice logistics, put forward a concrete implementation strategy of circular economy in China to develop green logistics from the view of government and business.
On Enterprise Pre-Tax Deduction Ways for Charitable Donations
Kexin Zheng,Juan Zhang
Asian Social Science , 2010, DOI: 10.5539/ass.v6n11p193
Abstract: The Law of the People’s Republic of China on Enterprise Income Tax regulates that in relation to the expenses from charitable donations incurred by Enterprises, the portion within 12% of the total annual profit may be deducted from the taxable income. The application of this Article is helpful for simplifying the calculation of enterprise income tax and encouraging tax-payers to engage in charitable donations. However, there is some problems and defects in practice. In this paper, by means of comparative analyses, authors explore the contradiction between the calculation of deduction limits for donations based on total annual profits and the principle of enterprise income tax calculation, together with the absence of rationality in operation, and further argue some new thoughts for improving the pre-tax deduction of charitable donations.
Remediation of Pb-Resistant Bacteria to Pb Polluted Soil  [PDF]
Bao Chen, Jia-nan Liu, Zheng Wang, Lei Dong, Jing-hua Fan, Juan-juan Qu
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.22015
Abstract: To show the remediation of Pb-resistant bacteria to Pb polluted soil, several indices including microbial counts, soil enzyme activity, microbial community diversity and soil Pb concentration were investigated. Two Pb-resistant bacteria were filtrated and identified by previous study as Bacillus pumilus and Pseudomonas aeruginosa (GeneBank Accession No. FJ402988 and GU017676) and inoculated to soil planted with cabbages. Soil with different Pb application rates were incubated for a period of 0, 12, 24, 36, 48 days in greenhouse. Results indicated the count of bacteria in 1000 mg/kg Pb treated soil greatly affected by inoculating Pb-resistant bacteria, which was raised about 237% and 347% compared with control. Soil urease and invertase were intensified 37.9% and 65.6% after inoculation compared with control. Phosphatase activity was inhibited by inoculation of Bacillus pumilus. Catalase activity was intensified about 64.2% in 24 days incubation but decrease in the following days. Microbial community diversity analyzed by polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) also proved that the samples inoculated with Pb-resistant bacteria exhibited more bands and intensity in DGGE patterns compared with uninoculated ones. For Pb-resistant bacteria inoculated samples, the reduction of Pb concentration in rhizospheric soil was 15 mg/kg at least and 42 mg/kg at most, and Pseudomonas aeruginosa showed a better tolerance to high Pb concentration and stronger remediation ability. It was concluded that remediation of Pb polluted soil can be promoted by the two Pb-resistant bacteria.
trans-Bis(N′-isopropylidenebenzohydrazidato-κ2N′,O)bis(pyridine-κN)nickel(II)
Chang-Zheng Zheng,Liang Wang,Juan Liu
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811024214
Abstract: The complex molecule of the title compound, [Ni(C10H11N2O)2(C5H5N)2], has a crystallographically imposed centre of symmetry. The NiII atom is coordinated in a distorted octahedral geometry by the O and N atoms of two trans arranged anionic bidentate hydrazone ligands forming the equatorial plane and by the N atoms of two pyridine molecules at the axial positions. In the crystal, intermolecular C—H...N hydrogen bonds link the molecules into columns parallel to the b axis.
Uniform Estimate of the Finite-Time Ruin Probability for All Times in a Generalized Compound Renewal Risk Model
Qingwu Gao,Na Jin,Juan Zheng
Advances in Decision Sciences , 2012, DOI: 10.1155/2012/936525
Abstract: We discuss the uniformly asymptotic estimate of the finite-time ruin probability for all times in a generalized compound renewal risk model, where the interarrival times of successive accidents and all the claim sizes caused by an accident are two sequences of random variables following a wide dependence structure. This wide dependence structure allows random variables to be either negatively dependent or positively dependent. 1. Introduction In this section, we will introduce a generalized compound renewal risk model, some common classes of heavy-tailed distributions, and some dependence structures of random variables (r.v.s), respectively. 1.1. Risk Model It is well known that the compound renewal risk model was first introduced by Tang et al. [1], and since then it has been extensively investigated by many researchers, for example, Ale?kevi?ien? et al. [2], Zhang et al. [3], Lin and Shen [4], Yang et al. [5], and the references therein. In the paper, we consider a generalized compound renewal risk model which satisfies the following assumptions. Assumption The interarrival times of successive accidents are nonnegative, identically distributed, but not necessarily independent r.v.s with finite mean . Assumption The claim sizes and their number caused by th accident are and , , respectively, where are nonnegative and identically distributed r.v.s with common distribution and finite mean , and are not necessarily independent r.v.s, but and are mutually independent for all , , while are independent, identically distributed (i.i.d.), and positive integer-valued r.v.s with common distribution and finite mean . Assumption The sequences , , and are mutually independent. Denote the arrival times of the th accident by , , which can form a nonstandard renewal counting process with mean function . Hence the total claim amount at time and the total claim amount up to time are, respectively, and then the insurer’s surplus process is given by where is the initial surplus and is the constant premium rate. The finite-time ruin probability within time is defined as Clearly, the ruin can only arise at the times , , then Let be a nonnegative r.v., the random time ruin probability is In order for the ultimate ruin not to be certain, we assume the safety loading condition holds, namely, In the generalized compound renewal risk model above, if all the sequences , , and are i.i.d. r.v.s, then the model is reduced to the standard compound renewal risk model introduced by Tang et al. [1], if , then the model is the renewal risk model, see Tang [6], Leipus and ?iaulys [7],
Modeling of ultrasound contrast agents bubble dynamics with modified surface tension coefficient
LuJie Zheng,Juan Tu,WeiZhong Chen
Chinese Science Bulletin , 2009, DOI: 10.1007/s11434-009-0431-9
Abstract: The current work proposes a model describing the dynamics of coated microbubbles, which simplifies the traditional three-layer model to a two-layer one by introducing a visco-elastic interface with variable surface tension coefficients to connect the gas zone and the liquid zone. In the modified model, the traditional two interfaces boundary conditions are combined into one to simplify the description of the bubble. Moreover, the surface tension coefficient is defined as a function of bubble radius with lower and upper limits, which are related to the buckling and rupture mechanisms of the bubble. Further discussion is made regarding the effects resulting from the change of the surface tension coefficient on bubble dynamics. The dynamic responses of Optison and Sonozoid microbubbles, measured experimentally based on light scattering technology (adapted from previously published work), are simulated using both classic three-layer models (e.g. Church’s model) and simplified model. The results show that our simplified model works as well as the Church’s model.
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