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Search Results: 1 - 10 of 10696 matches for " Maolin Du "
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The acceleration of the point of contact of a rigid body rolling without slipping on a fixed surface
刚体在固定面上纯滚时接触点的速度和加速度

DU Maolin,
杜茂林

力学与实践 , 2006,
Abstract: 在微小的时间间隔内,应用加速度合成定理和刚体上一点的加速度公式,推导出了接触点的加速度公式.加速度方向为运动刚体表面在该处的法线方向,大小与动接触线和定接触线的曲率半径和刚体运动的角速度有关.利用接触点的运动性质,不仅有助于解答圆球在固定圆球面或圆柱在固定圆柱面上的纯滚问题,而且为求解一般形状刚体在任意固定曲面上的纯滚问题提供了方便.
Cancer mortality in Inner Mongolia of China, 2008-2010  [PDF]
Ying Yang, Fengyun Zuo, Maolin Du, Zhiyue Liu, Zhijun Li, Wenfang Guo, Juan Sun
Open Journal of Epidemiology (OJEpi) , 2014, DOI: 10.4236/ojepi.2014.41003
Abstract: Objective: The aim of our study was to determine the status of the common cancer in Inner Mongolia of China. Methods: We obtained data from the Centers for Disease Control in the Inner Mongolia from five monitoring points of DRS in Inner Mongolia from 2008 to 2010. We calculated the crude mortality, the proportion of all cause of death during the three years, further calculated cancer mortality, the proportion of cancer death and PYLL by genders. Results: During the period 2008-2010, the crude mortality of all cause of death is 518.02 per million in Inner Mongolia. As the second most common cause of death, the mortality dying from cancer is 127.11 per million, accounting for over one fifth of all deaths. Among all deaths from cancer, the lung cancer had the highest mortality rates (46.25 per million in males and 17.95 per million in females) and PYLL (0.72 in males and 0.41 in females), followed by the liver cancer (23.76 per million) and the gastric cancer (16.15 per million). The female breast cancer is the fourth leading cancer from mortality and PYLL for 7.65 per million and 0.17. Conclusion: Our analysis determined the severity of cancer death in Inner Mongolia of China from 2008 to 2010.Our study found that the cancer mortality in Inner Mongolia is lower than Chinese average level and most west countries, higher than some Africa countries. Our results will guide future cancer control strategies in Inner Mongolia of China.
Breast Cancer in Inner Mongolia 2009-2011  [PDF]
Qin Li, Maolin Du, Kepeng Xin, Rong Liu, Yun Li, Wuyuntana Li, Xiong Su, Juan Sun
Open Journal of Epidemiology (OJEpi) , 2014, DOI: 10.4236/ojepi.2014.42011
Abstract: The aim of this study was to determine the mortality rate and the burden of breast cancers among residents of Inner Mongolia. We analyzed mortality data reported by the Death Registry System from 2009 to 2011. The age-specific mortality of breast cancer was close to female cancer in 25 to 35 years group. Regional distribution of breast cancer was not significant difference (p = 0.36). The women who were employed, married and living in rural areas were more likely to die of breast cancer. Over the period 2009 through 2011, the elimination of deaths from breast cancer resulted in increased life expectancy of 0.15 years. Mortality due to breast cancers is substantially greater among the younger women. Further, the mortality rate associated with breast cancers is greater for employed and married women than those unemployed and single women. Therefore, in Inner Mongolia, breast cancers appear to pose a greater mortality risk for young, employed and married women.
Bone Cancer Mortality in Inner Mongolia from 2008 to 2012  [PDF]
Wenfang Guo, Wenli Hao, Maolin Du, Zhuang Su, Yuelin Hu, Yuan Xia, Xiong Su, Juan Sun
Open Journal of Epidemiology (OJEpi) , 2015, DOI: 10.4236/ojepi.2015.51008
Abstract: Objective: The aim of our study was to assess bone cancer mortality and the related social factors in Inner Mongolia in China. Methods: We obtained data from the Centers for Disease Control in Inner Mongolia from five monitoring points of the Death Registry System in Inner Mongolia from 2008 to 2012. We calculated the crude mortality rate for bone cancer. The χ2 test was used to examine differences in bone cancer mortality rates between sexes and years. Unconditional logistic regressions were applied to analyze the effect of socio-demographic characteristics by sex. Results: Between 2008 and 2012, the crude mortality rate of bone cancer was 1.12/100000 (95% confidence interval = 1.02-1.21). The bone cancer mortality was 2.24 in men and 1.25 in women, resulting in a male-female ratio of 1.8. No between-year difference in the mortality rate was observed between 2008 and 2012 (men: χ2 = 4.65, P = 0.325; women: χ2 = 2.21, P = 0.698). In general, mortality increased with increasing age. People with a lower education level exhibited an increased risk of bone cancer among both men and women. Jobs involving extensive manual labor decreased the likelihood of bone cancer mortality, and the odds ratio was higher for men than women (0.6 vs. 0.45). Unmarried people had a higher risk for bone cancer than married people. Conclusion: The mortality rate of bone cancer was not significantly different between men and women from 2008 to 2012. The risk of bone cancer increased with age among both sexes. Unmarried people and those with a low education status had an elevated risk of bone cancer, whereas employment in a field involving extensive manual labor appeared to be a protective factor against bone cancer.
Nonlinear diffusion problems with free boundaries: Convergence, transition speed and zero number arguments,
Yihong Du,Bendong Lou,Maolin Zhou
Mathematics , 2015,
Abstract: This paper continues the investigation of Du and Lou (J. European Math Soc, to appear), where the long-time behavior of positive solutions to a nonlinear diffusion equation of the form $u_t=u_{xx}+f(u)$ for $x$ over a varying interval $(g(t), h(t))$ was examined. Here $x=g(t)$ and $x=h(t)$ are free boundaries evolving according to $g'(t)=-\mu u_x(t, g(t))$, $h'(t)=-\mu u_x(t,h(t))$, and $u(t, g(t))=u(t,h(t))=0$. We answer several intriguing questions left open in the paper of Du and Lou.First we prove the conjectured convergence result in the paper of Du and Lou for the general case that $f$ is $C^1$ and $f(0)=0$. Second, for bistable and combustion types of $f$, we determine the asymptotic propagation speed of $h(t)$ and $g(t)$ in the transition case. More presicely, we show that when the transition case happens, for bistable type of $f$ there exists a uniquely determined $c_1>0$ such that $\lim_{t\to\infty} h(t)/\ln t=\lim_{t\to\infty} -g(t)/\ln t=c_1$, and for combustion type of $f$, there exists a uniquely determined $c_2>0$ such that $\lim_{t\to\infty} h(t)/\sqrt t=\lim_{t\to\infty} -g(t)/\sqrt t=c_2$. Our approach is based on the zero number arguments of Matano and Angenent, and on the construction of delicate upper and lower solutions.
Semi-wave and spreading speed for the diffusive competition model with a free boundary
Yihong Du,Mingxin Wang,Maolin Zhou
Mathematics , 2015,
Abstract: We determine the asymptotic spreading speed of an invasive species, which invades the territory of a native competitor, governed by a diffusive competition model with a free boundary in a spherically symmetric setting. This free boundary problem was studied recently in [7] but only rough bounds of the spreading speed was obtained there. We show in this paper that the spreading speed has an asymptotic limit (as time goes to infnity), which is given by a certain traveling wave type system of one space dimension, called a semi-wave. This appears to be the first result that gives the precise asymptotic spreading speed for a two species system with free boundaries.
Gateways Placement in Backbone Wireless Mesh Networks  [PDF]
Maolin TANG
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2009, DOI: 10.4236/ijcns.2009.21005
Abstract: This paper presents a novel algorithm for the gate瑆ay placement problem in Backbone Wireless Mesh Networks (BWMNs). Different from existing algorithms, the new algorithm incrementally identifies gateways and assigns mesh routers to identified gateways. The new algorithm can guarantee to find a feasible gateway placement satisfying Quality-of-Service (QoS) constraints, including delay constraint, relay load constraint and gateway capacity constraint. Experimental results show that its performance is as good as that of the best of existing algorithms for the gateway placement problem. But, the new algorithm can be used for BWMNs that do not form one connected component, and it is easy to implement and use.
QoS-Aware Reference Station Placement for Regional Network RTK  [PDF]
Maolin Tang
Journal of Software Engineering and Applications (JSEA) , 2009, DOI: 10.4236/jsea.2009.21007
Abstract: Network RTK (Real-Time Kinematic) is a technology that is based on GPS (Global Positioning System) or more gener-ally on GNSS (Global Navigation Satellite System) measurements to achieve centimeter-level accuracy positioning in real-time. Reference station placement is an important problem in the design and deployment of network RTK systems as it directly affects the quality of the positioning service and the cost of the network RTK systems. This paper identifies a new reference station placement for network RTK, namely QoS-aware regional network RTK reference station placement problem, and proposes an algorithm for the new reference station placement problem. The algorithm can always produce a reference station placement solution that completely covers the region of network RTK.
DYNAMIC RESPONSES OF AN ELASTICALLY SUPPORTED BEAMS WITH DAMPING SUBJECTED TO BLAST LOADS
爆炸荷载作用下弹性与阻尼支承梁的动力响应

FANG Qin,DU Maolin,
方秦
,杜茂林

力学与实践 , 2006,
Abstract: Much attention has been paid to the properties of materials and the shapes of cross sections of beams in order to increase the resistance of blast-loaded structures. This paper discusses how to increase the blast resistance of beams effectively by elastic and damping supports at the ends of beams. The equations of the forced vibration of an elastically supported beam with damping are obtained by the Lagrange equations. The responses of the beam subjected to two typical blast loads with long and short durations are analyzed. The numerical results show that the displacements of the ends are decreased with the increase of the damping coefficient and the stiffness of the elastic support. In the case of blast loads with long duration, the resistance of beams can only be increased effectively by using elastic and damping supports simultaneously at the ends of beams, while the resistance of beams can be increased effectively by using elastic and damping supports either jointly or separately in the case of blast loads with short duration.
Analysis of Cause of Death in Inner Mongolia of China, 2008-2014  [PDF]
Shuli Xing, Zhiqiang Sun, Maolin Du, Xuesen Shi, Hairong Zhang, Zhanlong Wang, Xiaoyan Zhang, Zhihui Hao, Zhuang Su, Ying Yang, Rong Liu, Yueling Hu, Juan Sun
Open Journal of Epidemiology (OJEpi) , 2017, DOI: 10.4236/ojepi.2017.71002
Abstract: Objective: The aim of our study was to analyze the character of cause of death in Inner Mongolia of China from 2008 to 2014. Methods: We collected data from monitoring points of the Death Registry System (DRS) in Inner Mongolia. We calculated the mortality rates by gender, year and age-specific. We calculated the proportion, the mortality rate and potential years of life lost (PYLL) of various system deaths. Results: During the period 2008-2014, the average crude mortality rate of all cause of death was 539.33/105. The mortality rate increased semilogarithm linearly with age. The top four system deaths were circulatory system, neoplasm, respiratory system and injury. In 2014, the mortality rates of circulatory system were increased and the mortality rates of certain infectious and parasitic diseases, neoplasms, respiratory system, genitourinary system and injury were decreased compared to those in 2008. Conclusion: Through analysis the indicators of proportion, the mortality rate and PYLL indicated that health status of a population in Inner Mongolia was at a better level.
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