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Search Results: 1 - 10 of 87393 matches for " Rong Chen "
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A theory about induced electric current and heating in plasma  [PDF]
Zhiliang Yang, Rong Chen
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.34035
Abstract: The traditional generalized Ohm’s law in MHD (Magnetohydrodynamics) does not explicitly present the relation of electric currents and electric fields in fully ionized plasma, and leads to some unexpected concepts, such as ``the magnetic frozen-in plasma'', magnetic reconnection etc. In the single fluid model, the action between electric current and magnetic field is not considered. In the two-fluid model, the derivation is based on the two dynamic equations of ions and electrons. The electric current in traditional generalized Ohm's law depends on the velocities of the plasma, which should be decided by the two dynamic equations. However, the plasma velocity, eventually not free, is inappropriately considered as free parameter in the traditional generalized Ohm's law. In the present paper, we solve the balance equation that can give exact solution of the velocities of electrons and ions, and then derive the electric current in fully ionized plasma. In the case ignoring boundary condition, there is no electric current in the plane perpendicular to the magnetic field when external forces are ignored. The electric field in the plane perpendicular to magnetic field do not contribute to the electric currents, so do the induced electric field from the motion of the plasma across magnetic field. The lack of induced electric current will keep magnetic field in space unaffected. The velocity of the bulk velocity of the plasma perpendicular to magnetic field is not free, it is decided by electromagnetic field and the external forces. We conclude that the bulk velocity of the fully ionized plasma is not coupled with the magnetic field. The motion of the plasma do not change the magnetic field in space, but the plasma will be confined by magnetic field. Due to the confinement of magnetic field, the plasma kinetic energy will be transformed into plasma thermal energy by the Lamor motion and collisions between the same species of particles inside plasma. Because the electric field perpendicular to magnetic field do not contribute electric current, the variation of magnetic field will transfer energy directly into the plasma thermal energy by induced electric field. The heating of plasma could be from the kinetic energy and the variation of magnetic field.
Motion-Sensing Based Management System for Smart Context-Awareness Rehabilitation Healthcare  [PDF]
Tung-Hung Lu, Hsing-Chen Lin, Rong-Rong Chen, Ya-Ling Chen
Advances in Internet of Things (AIT) , 2013, DOI: 10.4236/ait.2013.32A001

In this paper, a motion-sensing based management system for smart context-awareness rehabilitation healthcare including various balance exercise is built by the integration of the physiological sensing and feedback coaching. The home-end system can not only provide the exercise coaching instruction, the balance stability analysis, and the motion similarity analysis in real-time, but also simultaneously transmit the user image, exercise skeleton streaming, center of pressure (COP), center of gravity (COG) and physiological information to the telecare-end center. According to the combination of the home-end and the telecare-end as well as the real-time care management of one-to-multiple personal balance exercise monitor, this system can provide user various personalized balance exercise prescription and cardiac rehabilitation coaching in an effectiveness rehabilitation exercise environment. Therefore, via this tele-system, the spinocerebellar ataxia (SCA) patients in balance rehabilitation stage not only can be monitored execution status of the rehabilitation exercise prescription, but also can be long-term monitored and evaluated the predicted goal of the rehabilitation exercise balance stability in order to improve patients compliance.

The Effects of He-Ne Laser and Enhanced Ultraviolet-B Radiation on Proliferating-Cell Nuclear Antigen in Wheat Seedlings  [PDF]
Feifeng Liu, Huize Chen, Rong Han
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.68124
Abstract: The level of ultraviolet-B (UV-B) radiation on the Earth’s surface has increased due to depletion of the ozone layer. Here, we explored the effects of continuous wave He-Ne laser irradiation (632 nm, 5 mW·mm-2, 2 min·d-1) on proliferating-cell nuclear antigen (PCNA) damage repair function of wheat seedlings exposed to enhanced UV-B radiation (10.08 kJ·m-2·d-1) at the early growth stages. Wheat seedlings were irradiated with enhanced UV-B, He-Ne laser treatment or a combination of the two. We explored the transcripts of PCNA in each treatment group using RT-PCR. In addition, total proteins were extracted from the 7-day-old wheat leaves, analyzed by SDS-PAGE and identified by western blot. The results showed that the transcription of PCNA was weakened following UV-B radiation compared to the control. However, when seedlings were subjected to elevated UV-B-damaging radiation followed by He-Ne laser irradiation, the expression of PCNA was signifi-cantly higher than UV-B radiation alone. These results suggest that He-Ne laser has an active role in repairing the UV-B damaging effects. In order to further investigate the function of PCNA, dynamic arrangements of PCNA in wheat root-tip cells were observed with confocal laser scanning microscopy (CLSM). The PCNA was marked fluorescent dimming and strength weakened in en-hanced UV-B radiation (UV-B) compared with the control group (CK) during processing. It shows that PCNA may be involved in the separation of chromosomes.
Different Doses of the Enhanced UV-B Radiation Effects on Wheat Somatic Cell Division  [PDF]
Feifeng Liu, Huize Chen, Rong Han
CellBio (CellBio) , 2015, DOI: 10.4236/cellbio.2015.42004
Abstract: Being sessile, plants are continuously exposed to DNA-damaging agents presenting in the environment such as ultraviolet (UV). Sunlight acts as an energy source for photosynthetic plants; hence, avoidance of UV radiations (namely, UV-A, 315 - 400 nm; UV-B, 280 - 315 nm; and UV-C, <280 nm) is unpreventable. DNA in particular strongly absorbs UV-B; therefore, it is the most important target for UV-B induced damages. This paper mainly used different doses of the enhanced UV-B radiation (B1 group: 4.05 kJ•m-2•d-1, B2 group: 10.08 kJ•m-2•d-1, B3 group: 7.05 kJ•m-2•d-1, B4 group: 23.02 kJ•m-2•d-1) treatment wheat, then, explored on the growth of wheat root and wheat root tip cell of chromosome aberration effect. In wheat, root-tip cells were observed with confocal laser scanning microscopy (CLSM), the results showed that low doses of B1 group (4.05 kJ•m-2•d-1) promoted the growth of wheat root and cell mitosis frequency. But high dose of B2 group (10.08 kJ•m-2•d-1), B3 group (17.05 kJ•m-2•d-1), B4 group (23.02 kJ•m-2•d-1) inhibited the growth of wheat root tip, and made crooked growth of wheat root, and inhibited the wheat root tip cell mitotic frequency and processed that induce root tip cells of wheat produce all kinds of aberration of chromosome in the interphase containing “multiple nucleoli nuclei”, “incomplete nuclei”, “long round nuclei”, “bean sprouts nucleus”. In mitosis M period contains “dissociative chromosome”, “chromosome bridge”, “adhesion chromosome”, “multi-bundle divide”, “nuclear anomalies”. After, high doses of enhanced UV-B radiation treatment, most of the cell cycle anomaly concentrated in mitosis interphase. In mitosis M period, with UV-B radiation dose enhanced chromosome aberration rate was on the rise and the aberration types also increasing.
Quantile Regression Based on Laplacian Manifold Regularizer with the Data Sparsity in l1 Spaces  [PDF]
Ru Feng, Shuang Chen, Lanlan Rong
Open Journal of Statistics (OJS) , 2017, DOI: 10.4236/ojs.2017.75056
Abstract: In this paper, we consider the regularized learning schemes based on l1-regularizer and pinball loss in a data dependent hypothesis space. The target is the error analysis for the quantile regression learning. There is no regularized condition with the kernel function, excepting continuity and boundness. The graph-based semi-supervised algorithm leads to an extra error term called manifold error. Part of new error bounds and convergence rates are exactly derived with the techniques consisting of l1-empirical covering number and boundness decomposition.
Optimal Investment Problem for Life Insurance Company by Considering Health-Level  [PDF]
Jiachen Chen, Ximin Rong, Hui Zhao
Modern Economy (ME) , 2019, DOI: 10.4236/me.2019.104075
Abstract: In this paper, we study the optimal investment strategy for a life insurance company in a health-level framework. The income-levels of residents in different regions are different and this leads to different health-levels for various regions. We present a new framework to study the risk caused by different health-levels. The surplus process of the insurance company is described by the classical Cramér-Lundberg Model. The company is allowed to invest in a risk-free asset and a risky asset. For mean-variance criterion, we establish the corresponding Hamilton-Jacobi-Bellmen (HJB) equations and derive the time-consistent investment strategy. Finally, we provide numerical simulations to analyze the effects of the health-level on the insurer’s value function.
Grouping Optimization Based on Social Relationships
Rong-Chang Chen
Mathematical Problems in Engineering , 2012, DOI: 10.1155/2012/170563
Abstract: Grouping based on social relationships is a complex problem since the social relationships within a group usually form a complicated network. To solve the problem, a novel approach which uses a combined sociometry and genetic algorithm (CSGA) is presented. A new nonlinear relation model derived from the sociometry is established to measure the social relationships, which are then used as the basis in genetic algorithm (GA) program to optimize the grouping. To evaluate the effectiveness of the proposed approach, three real datasets collected from a famous college in Taiwan were utilized. Experimental results show that CSGA optimizes the grouping effectively and efficiently and students are very satisfied with the grouping results, feel the proposed approach interesting, and show a high repeat intention of using it. In addition, a paired sample t-test shows that the overall satisfaction on the proposed CSGA approach is significantly higher than the random method.
Effects of Guanxinkang on expressions of ATP-sensitive potassium channel subunits Kir6.1, Kir6.2, SUR2A and SUR2B in ischemic myocytes of rats
Fu-rong CHEN
Zhong Xi Yi Jie He Xue Bao , 2010,
Abstract: Objective: To observe the effects of Guanxinkang injection, a compound traditional Chinese herbal medicine, on ATP-sensitive potassium (KATP) channel subunits in ischemic myocardial cells of rats, and to explore the mechanism of Guanxinkang in protecting myocardial ischemic reperfusion injuries.Methods: Forty-eight Wistar rats were randomly divided into normal group, untreated group, glibenclamide group, pinacidil group, Guanxinkang group and Guanxinkang plus glibenclamide group. The ventricular myocytes were prepared from hearts of normal rats by enzymatic dissociation method. The ischemic ventricular myocytes underwent perfusion with normal Tyrode' solution for 10 min, then stopping perfusion 30 min, and followed by 45 min of reperfusion. The glibenclamide, pinacidil and Guanxinkang were added into ventricular myocytes solution directly. Then the solutions were placed at 4 ℃. After 24-hour freezing at -80 ℃, mRNA and protein expressions of KATP subunits Kir6.1, Kir6.2, SUR2A and SUR2B were measured by real-time quantitative polymerase chain reaction and Western blotting respectively. Results: In normal rat myocardial cells, there were SUR2A, Kir6.1, and Kir6.2 protein and gene expressions but no expression of SUR2B protein. In the untreated group, all subunit mRNA and protein expressions of KATP increased to some extent as compared with the normal group. Pinacidil, a potassium channel opener, significantly increased mRNA and protein expressions of KATP subunits, while the blocker glibenclamide had a reverse effect. Meanwhile, Guanxinkang injection significantly increased mRNA and protein expressions of KATP subunits but with no significant difference as compared with pinacidil. Conclusion: Guanxinkang injection can obviously enhance the open of KATP channel and thus play a role in cardiovascular protection.
Portal hemodynamics in patients with different syndromes of cirrhosis
CHEN Xiao-Rong
Zhong Xi Yi Jie He Xue Bao , 2004,
Abstract: Objective: To explore the relationship between the portal hemodynamics or the indices of liver fibrosis and the liver function score in patients with different traditional Chinese medical syndromes of liver cirrhosis. Methods: One hundred and forty-seven cases of liver cirrhosis with different syndromes were included in the study. Diameters and blood flow velocities of the portal vein and splenic vein were tested by color Doppler sonarography. The indices of liver function (TBIL, ALT, AST, Alb, Glb, PTA) and the indices of hepatic fibrosis(HA, PC-Ⅲ, LN, Ⅵ-C)were tested. Results: The diameters of portal vein in liver cirrhosis patients with different syndromes (internal accumulation of damp-heat, stagnation of liver-qi, superabundance of dampness due to spleen-asthenia, asthenia of liver and kidney yin, asthenia of spleen and kidney yang, blood stasis) were not significantly different. The blood flow velocities and flow volumes of portal vein in patients with the blood stasis syndrome and the internal accumulation of damp-heat syndrome were significantly different (P<0.05). The diameter of splenic vein in patients with the internal accumulation of damp-heat syndrome was significantly different to that of the asthenia of liver and kidney yin syndrome, or the blood stasis syndrome, or the asthenia of spleen and kidney yang syndrome, respectively (P<0.05 or P<0.01). The blood flow velocity of splenic vein in patients with the blood stasis syndrome or the asthenia of spleen and kidney yang syndrome was significantly different to that of the internal accumulation of damp-heat syndrome, or the stagnation of liver-qi syndrome, or the asthenia of liver and kidney yin syndrome, respectively (P<0.01). The blood flow volume of splenic vein in patients with the internal accumulation of damp-heat syndrome was significantly different to that of the asthenia of liver and kidney yin syndrome, or the asthenia of spleen and kidney yang syndrome, or the blood stasis syndrome, respectively (P<0.01). The liver cirrhosis indices HA and PC-Ш in patients with the asthenia of liver and kidney yin syndrome were significantly different to those of the internal accumulation of damp-heat syndrome (P<0.05). In Child-Pugh classification, the incidence of Child-Pugh C was the highest in the asthenia of spleen and kidney yang syndrome, while the incidence of Child-Pugh A was the highest in the stagnation of liver-qi syndrome. Conclusion: The changes of portal vein dynamics in liver cirrhosis patients with the asthenia of liver and kidney yin syndrome, or the asthenia of spleen and kidne
Non-glottalization in Korean Fortis Consonants
Wei-rong Chen
Canadian Social Science , 2012, DOI: 10.3968/2315
Abstract: It is claimed that the three types of obstruent consonants in Korean (fortis/lenis/aspirated) are currently undergoing a diachronic change in articulation in that the differences in the voice onset time (VOT, in association with the degree of aspiration) is becoming not completely contrastive while the contrasts in pitch height (fundamental frequency) surface as a more reliable perceptual cue. Controversy still exists whether this change brings in concomitant modifications in other articulatory dimensions, especially the presence of glottalization, commonly used to manifest the notion of articulatory fortisness in the literature. The aim of this study is to examine whether the presence/ absence of glottalization holds in the contrast of fortis/ lenis consonants in the contemporary Korean language, by directly observing the glottal states via a trans-nasal fiberscope (laryngoscope). Our results elicited from Seoul subjects in younger generation of 30s show that the glottal constriction states of Korean fortis consonants exhibit no observable glottalization, in terms of the Six Valves of Throat Framework for sub-glottal reinforcements. Keywords: Laryngoscope; Korean language; Glottalization; Fortis consonants Résumé On a proposé que les trois types des consonnes obstruante du coréen (fortis/lenis/aspirées) sont en cours de changement diachronique de leur articulation. Les différences de délai de voisement (ou VOT), marquant différents degrés d’aspiration ne sont plus complètement contrastives, tandis que les différences de hauteur mélodique (F0) sont devenues des indices plus fiables en perception. Les opinions divergent sur la question de savoir si ce changement entra ne des modifications concominantes sur d’autres dimensions articulatoires, notamment la glottalisation, souvent considérée dans la littérature comme corrélat de l’articulation “fortis”. Notre étude vise à examiner si la présence/absence de glottalisation est maintenue dans le contraste fortis/lenis des occlusives du coréen contemporain, à l’aide de l’observation directe de la glotte par fibroscopie nasale (laryngoscopie). Nos résultats obtenus avec des locuteurs de Séoul agés d’une trentaine d’années ne montrent pour la constriction glottale des consonnes fortis aucun des signes de glottalisation proposés dans le cadre des “Six Valves of Throat for sub-glottal reinforcements” [six valves de gorge pour le renforcement sub-glottique] de Edmondson & Esling. Mots cles: Laryngoscopie; Langue coréenne; Glottalisation; Consonnes fortis
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