oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 45 )

2018 ( 1323 )

2017 ( 1192 )

2016 ( 1201 )

Custom range...

Search Results: 1 - 10 of 89617 matches for " Yun Chen "
All listed articles are free for downloading (OA Articles)
Page 1 /89617
Display every page Item
Water Cycle and Irrigation Expansion: An Application of Multi-Criteria Evaluation in the Limestone Coast (Australia)  [PDF]
Zahra Paydar, Yun Chen
Journal of Water Resource and Protection (JWARP) , 2014, DOI: 10.4236/jwarp.2014.67063
Abstract:

A summary of the current understanding of the hydrological system in the Limestone Coast in Australia is presented. The regional water balance analysis indicated about 90% of the water is lost through evapotranspiration. Irrigation consumes a substantial part of the groundwater and returns up to half of the water inflow to the aquifer. A multi-criteria analysis using fuzzy quantifiers and analytical hierarchy process was applied for future irrigation expansion. The results showed a total of 94,632 ha of land, considered suitable for irrigation where groundwater is not over-allocated or over used. This model showed some advantages over the conventional multi-criteria evaluation methods as it avoids arbitrary decisions on criteria weightings.

Facts about Endosalpingiosis  [PDF]
Min Hou, Lipai Chen, Jingping Yun
Open Journal of Obstetrics and Gynecology (OJOG) , 2015, DOI: 10.4236/ojog.2015.510075
Abstract: Endosalpingiosis was first described by Sampson in 1930. However, until recently more and more studies show the convincing evidence that it most probably originates from tubal cells. It has a close relationship with the development of serous tumors, especially low-grade serous carcinoma. The lesion does cause symptoms and signs, such as chronic abdominal pain or tumor-like mass, though it is often found accidently for other gynecologic problems. Occasionally atypical endosalpingiosis needs to be differentiated from a malignancy when it appears in an unusual site with worrying morphologic presentations or under some special circumstances. Owing to the facts that it may evolve quietly and continuously towards serous tumors, and that the lesions at different sites may evolve independently, the outcomes of its evolution can eventually kill the patient. Therefore, a proper recognition of the lesion will translate it into an adequate care for those patients. This review summarizes the most recent findings and makes thoughtful comments.
Synthesis of a Pyrene-Derived Schiff Base and Its Selective Fluorescent Enhancement by Zinc and Aluminum Ions  [PDF]
Ping-Feng Hsu, Yun Chen
International Journal of Organic Chemistry (IJOC) , 2018, DOI: 10.4236/ijoc.2018.82016
Abstract: An efficient pyrene-Schiff base fluorescent sensor PySb was synthesized and evaluated for its fluorescence response to metal ions. Sensor PySb exhibits an “off-on-type” mode with high selectivity to Zn2+ and Al3+ in ethanol (470 nm) and in dimethyl sulfoxide (458 nm) respectively. The originally non-fluorescent PySb, due to photo-induced electron transfer (PET) from imine moiety, is turned on after binding with the cations. The stoichiometric ratio between PySb and Zn2+ is 1:2; moreover, the limit of detection (LOD) and bonding constant were 2.39 × 10-8 M and 2 × 109 M-1 respectively, as obtained from titration experiments.
Solution Processable Material Derived from Aromatic Triazole, Azomethine and Tris: Preparation and Hole-Buffering Application in Polymer Light-Emitting Diodes  [PDF]
Chih-Yang Lin, Yun Chen
Journal of Materials Science and Chemical Engineering (MSCE) , 2018, DOI: 10.4236/msce.2018.69002
Abstract: This work presents the synthesis of a new hole-buffering material TAZS and its successful application in polymer light-emitting diodes to enhance device performance. The TAZS is composed of aromatic 1,2,4-triazolylcore linked with three trihydroxy tert-butyl terminals via azomethine linkages. The TAZS forms ashomogeneous film deposited by spin-coating process. The HOMO and LUMO levels of TAZS are -5.23 eV and -2.40 eV, respectively, as estimated from cyclic voltammogram. The current density results of hole-only and electron-only devices confirm strong hole-buffering capability of TAZS layer. Multilayer PLEDs with different thickness of TAZS (ITO/PEDOT: PSS/TAZS (x nm)/SY/ETL/LiF/Al) have been successfully fabricated, using spin-coating process to deposit hole-injecting PEDOT: PSS, TAZS, and emissive SY layers. The PLED with 16 nm TAZS reveals the optimal device performance, with maximum luminance and maximum current efficiency of 19,046 cd/m2 and 4.08 cd/A, respectively, surpassing those without TAZS as HBL (8484 cd/m2, 2.13 cd/A). The hole-buffering characteristic of TAZS contributes greatly to improved charges’ recombination ratio and enhanced emission efficiency.
Spike protein homology between the SARS-associated virus and murine hepatitis virus implies existence of a putative receptor-binding region
Yun Lu,Yinghua Chen
Chinese Science Bulletin , 2003, DOI: 10.1007/BF03185764
Abstract: Coronavirus has been determined to be the cause of the recent outbreak of severe acute respiratory syndrome (SARS). Human coronavirus 229E had been studied well and its receptor-binding domain was restricted to aa417–547 of S protein. However, this region has no homology with the newly separated SARS-associated virus (Hong Kong isolate CUHK-W1). Then we analyzed the phylogenesis of S1 subunit of the coronavirus spike protein (SARS-associated virus, Hong Kong isolate CUHK-W1). Interestingly, the highest homology between murine hepatitis virus (MHV) and SARS-associated coronavirus was found. And the important sites (aa62–65 and aa214–216) on the spike protein of MHV with receptor-binding capacity were highly conservative in comparison with the newly separated SARS-associated virus (the corresponding sites are aa51–54 and aal95–197). These results from bioinformatics analysis might help us to study the receptor-binding sites of SARS-associated virus and the mechanism of the virus entry into the target cell, and design antiviral drugs and potent vaccines.
Caveats for Using Shock Tube in Blast-Induced Traumatic Brain Injury Research
Yun Chen,Shlomi Constantini
Frontiers in Neurology , 2013, DOI: 10.3389/fneur.2013.00117
Abstract:
The Differences between Blast-Induced and Sports-Related Brain Injuries
Yun Chen,Shlomi Constantini
Frontiers in Neurology , 2013, DOI: 10.3389/fneur.2013.00119
Abstract:
Hubble parameter data constraints on dark energy
Yun Chen,Bharat Ratra
Physics , 2011, DOI: 10.1016/j.physletb.2011.08.035
Abstract: We use Hubble parameter versus redshift data from Stern, et al(2010) and Gazta\~{n}aga, et al (2009) to place constraints on model parameters of constant and time-evolving dark energy cosmological models. These constraints are consistent with (through not as restrictive as) those derived from supernova Type Ia magnitude-redshift data. However, they are more restrictive than those derived from galaxy cluster angular diameter distance, and comparable with those from gamma-ray burst and lookback time data. A joint analysis of the Hubble parameter data with more restrictive baryon acoustic oscillation peak length scale and supernova Type Ia apparent magnitude data favors a spatially-flat cosmological model currently dominated by a time-independent cosmological constant but does not exclude time-varying dark energy.
Galaxy cluster angular size data constraints on dark energy
Yun Chen,Bharat Ratra
Physics , 2011, DOI: 10.1051/0004-6361/201117944
Abstract: We use angular size versus redshift data for galaxy clusters from Bonamente et al. (2006) to place constraints on model parameters of constant and time-evolving dark energy cosmological models. These constraints are compatible with those from other recent data, but are not very restrictive. A joint analysis of the angular size data with more restrictive baryon acoustic oscillation peak length scale and supernova Type Ia apparent magnitude data favors a spatially-flat cosmological model currently dominated by a time-independent cosmological constant but does not exclude time-varying dark energy.
Parabolic Constructions of Asymptotically Flat 3-metrics of Prescribed Scalar Curvature
Chen-Yun Lin
Mathematics , 2012,
Abstract: In 1993, Bartnik introduced a quasi-spherical construction of metrics of prescribed scalar curvature on 3-manifolds. Under quasi-spherical ansatz, the problem is converted into the initial value problem for a semi-linear parabolic equation of the lapse function. The original ansatz of Bartnik started with a background foliation with round metrics on the 2-sphere leaves. This has been generalized by several authors under various assumptions on the background foliation. In this article, we consider background foliations given by conformal round metrics, and by the Ricci flow on 2-spheres. We discuss conditions on the scalar curvature function and on the foliation that guarantee the solvability of the parabolic equation, and thus the existence of asymptotically flat 3-metrics with a prescribed inner boundary. In particular, many examples of asymptotically flat-scalar flat 3-metrics with outermost minimal surfaces are obtained.
Page 1 /89617
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.