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Search Results: 1 - 10 of 28311 matches for " X. Ren "
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A Preliminary of Dynamic Stability Analysis  [PDF]
Ren Song, S. X. Wu
Open Journal of Applied Sciences (OJAppS) , 2016, DOI: 10.4236/ojapps.2016.66036
Abstract: On account of the traditional method in hybrid stability analysis being too rough, a new method of taking dual or single mode was put forward for 4 typical levers in the hybrid stability analysis respectively and transited to the dynamic analysis smoothly. After verifying the superiority of the method through examples, the broad application prospect would be given in the end.
Use of Shore Hardness Tests for In-Process Properties Estimation/Monitoring of Silicone Rubbers  [PDF]
H. Zhao, D. Allanson, X. J. Ren
Journal of Materials Science and Chemical Engineering (MSCE) , 2015, DOI: 10.4236/msce.2015.37019
Abstract:

Casting is an important rubber manufacturing process for both production and material developments. A quick and flexible way of testing the constitutive materials properties of rubber products is very important for optimising the processing parameters and quality control. In many cases, standard tests such as tensile or compression tests are time consuming and require a large volume of materials. This work reports some recent work in using a combined numerical and experimental approach to characterise the properties of rubber materials during a casting process. Durometer shore hardness is used to test silicone rubbers (as a model material) with different compositions on different moulding planes and the linear elastic property is estimated from the hardnesses. The predicted properties are systematically compared with the experimental tests on hard and soft silicone rubber samples with different compositions. The work shows that shore hardness can be used as an effective way to monitor the materials properties during amoulding process for process optimisation and quality control.

Quantum discord: "discord" between the whole and its constituent
X. -J. Ren,H. Fan
Mathematics , 2011, DOI: 10.1088/1751-8113/45/42/425304
Abstract: Quantum discord, a measure of quantum correlation beyond entanglement, is initially defined as the discord between two classically equivalent while quantum discordant definitions of mutual information. In this paper, we report some new interpretations of discord which rely on the differences between measurement induced effects on the local measured system and the whole system. Specifically, with proper quantitative definitions introduced in [Buscemi, Hayashi and Horodecki, Phys. Rev. Lett. 100, 2210504 (2008)], we find that quantum discord can be interpreted as the differences of measurement induced disturbance or information gain on the local measured system and on the whole system. Combined with previous similar results based on measurement induced entanglement and decoherence, our results provide a unified view on quantum discord.
Antitumor activity of dichloroacetate on C6 glioma cell: in vitro and in vivo evaluation
Duan Y,Zhao X,Ren W,Wang X
OncoTargets and Therapy , 2013,
Abstract: Yu Duan,1 Xin Zhao,1 Wei Ren,1 Xin Wang,1 Ke-Fu Yu,1 Dan Li,1 Xuan Zhang,1 Qiang Zhang1,2 1Department of Pharmaceutics, School of Pharmaceutical Sciences, Peking University, Beijing, People's Republic of China; 2State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, People’s Republic of China Abstract: Dichloroacetate (DCA), a small molecule mitochondria-targeting agent, can penetrate the blood–brain barrier, showing potential therapeutic effects on brain tumors. Considering the effects of DCA on tumor cellular metabolism, penetrating across the blood–brain barrier, as well as having potential antitumor activity on brain tumors, the purpose of this study is to investigate the antitumor activity of DCA on C6 glioma cells in vitro and in vivo. DCA inhibited C6 glioma cell proliferation, induced C6 cell apoptosis, and arrested C6 cells in S phase. DCA can inhibit the expression of heat shock proteins 70 (Hsp70) in a dose-dependent and time-dependent manner (P < 0.01). Our in vivo antitumor effect results indicated that DCA markedly inhibited the growth of C6 glioma tumors in both C6 brain tumor-bearing rats and C6 tumor-bearing nude mice (P <0.01). DCA significantly induced the ROS production and decreased the mitochondrial membrane potential in tumor tissues. Our in vivo antitumor effect results also indicated that DCA has potential antiangiogenic effects. In conclusion, DCA may be a viable therapeutic agent in the treatment of gliomas. Keywords: dichloroacetate, DCA, C6 glioma, antitumor efficacy, in vitro, in vivo
Detecting Impulses in Mechanical Signals by Wavelets
X.-M. Ren,W.-X. Yang
EURASIP Journal on Advances in Signal Processing , 2004, DOI: 10.1155/s1687617204311091
Abstract: The presence of periodical or nonperiodical impulses in vibration signals often indicates the occurrence of machine faults. This knowledge is applied to the fault diagnosis of such machines as engines, gearboxes, rolling element bearings, and so on. The development of an effective impulse detection technique is necessary and significant for evaluating the working condition of these machines, diagnosing their malfunctions, and keeping them running normally over prolong periods. With the aid of wavelet transforms, a wavelet-based envelope analysis method is proposed. In order to suppress any undesired information and highlight the features of interest, an improved soft threshold method has been designed so that the inspected signal is analyzed in a more exact way. Furthermore, an impulse detection technique is developed based on the aforementioned methods. The effectiveness of the proposed technique on the extraction of impulsive features of mechanical signals has been proved by both simulated and practical experiments.
Tumor Imaging and Radiotherapy Using Oncolytic Viruses  [PDF]
Zi J. Wu, Xian W. Wang, Hong W. Xin, Bo X. Ren
Yangtze Medicine (YM) , 2016,
Abstract: Dr. Zhaohui Peng et al. developed the first clinically approved gene therapy drug in the world, the recombinant adenovirus p53 (rAd-p53, Gendicine), for tumor virotherapy in China in 2005. In 2015, an oncolytic herpes simplex virus expressing GM-CSF (Talimogene laherparepvec, T-VEC) was approved for melanoma treatment in US. Tumor virotherapy as a promising tumor therapeutic modality has now attracted more and more attention in the field of oncology. However, the effectiveness of current tumor virotherapy needs to be improved. To improve tumor virotherapy, virus infection in tumors and their oncolytic effects have been monitored in vivo non-in-vasively and quantitatively using molecular imaging technologies, and the synergistic anti-tumor effects have been achieved by the combination of tumor virotherapy and radiotherapy. On the one hand, oncolytic viruses carrying reporter genes replicate in tumor cells selectively to achieve tumor imaging and oncolytic virus tracing. On the other hand, oncolytic viruses can be used to deliver radionuclide into the infected tumor cells. This review summarizes the latest development and molecular mechanisms of tumor imaging and radiotherapy using oncolytic viruses.
Improved superlensing in two-dimensional photonic crystals with a basis
X. Wang,Z. F. Ren,K. Kempa
Physics , 2004, DOI: 10.1063/1.1863413
Abstract: We study propagation of light in square and hexagonal two-dimensional photonic crystals. We show, that slabs of these crystals focus light with subwavelength resolution. We propose a systematic way to increase this resolution, at an essentially fixed frequency, by employing a hierarchy of crystals of the same structure, and the same lattice constant, but with an increasingly complex basis.
Central Limit Theorems for Supercritical Branching Markov Processes
Y. -X. Ren,R. Song,R. Zhang
Mathematics , 2013,
Abstract: In this paper we establish spatial central limit theorems for a large class of supercritical branching Markov processes with general spatial-dependent branching mechanisms. These are generalizations of the spatial central limit theorems proved in [1], P. for branching OU processes with binary branching mechanisms. Compared with the results of [1], our central limit theorems are more satisfactory in the sense that the normal random variables in our theorems are non-degenerate.
Slice regular composition operators
G. B. Ren,X. P. Wang
Mathematics , 2014,
Abstract: In the article the class of slice regular functions is shown to be closed under a new regular composition. The new regular composition turns out to be globally defined in contrast to the locally defined version by Vlacci. Its advantage over Vlacci's is demonstrated by its associated theory of composition operators and dynamical systems for slice regular functions. Especially, the corresponding Littlewood subordination principle and the Denjoy-Wolff type theorem can be established.
Carathéodory theorems for Slice Regular Functions
G. B. Ren,X. P. Wang
Mathematics , 2014,
Abstract: In this paper a quaternionic sharp version of the Carath\'{e}odory theorem is established for slice regular functions with positive real part, which strengthes a weaken version recently established by D. Alpay et. al. using the Herglotz integral formula. Moreover, the restriction of positive real part can be relaxed so that the theorem becomes the quaternionic version of the Borel-Carath\'{e}odory theorem. It turns out that the two theorems are equivalent.
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