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Search Results: 1 - 10 of 59054 matches for " Jinlin Yang "
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On a class of univalent functions
Dinggong Yang,Jinlin Liu
International Journal of Mathematics and Mathematical Sciences , 1999, DOI: 10.1155/s0161171299226051
Abstract: We consider the class of univalent functions defined by the conditions f(z)/z ¢ ‰ 0 and |(z/f(z)) ¢ € 2 ¢ € ¢ € 2| ¢ ‰ ¤ ±,|z|<1, where f(z)=z+ ¢ ˉ is analytic in |z|<1 and 0< ± ¢ ‰ ¤2.
Viability Discrimination of a Class of Control Systems on a Nonsmooth Region
Na Zhao,Jianfeng Lv,Jinlin Yang,Xinzhi Liu
Discrete Dynamics in Nature and Society , 2014, DOI: 10.1155/2014/127185
Abstract: The viability problem is an important field of study in control theory; the corresponding research has profound significance in both theory and practice. In this paper, we consider the viability for both an affine nonlinear hybrid system and a hybrid differential inclusion on a region with subdifferentiable boundary. Based on the nonsmooth analysis theory, we obtain a method to verify the viability condition at a point, when the boundary function of the region is subdifferentiable and its subdifferential is convex hull of many finite points. 1. Introduction Hybrid systems have been used to describe complex dynamic systems that involve both continuous and discrete systems. Such hybrid systems can be extensively used in robotics, automated highway systems, air traffic management systems, manufacturing, communication networks, and computer synchronization, and so forth. There has been significant research activity in the area of hybrid systems in the past decade involving researchers from several areas [1–8]. In recent years, the viability of systems is an important research topic; it has been widely used in both reach-ability and designing security domain. In the study of hybrid systems, the concept of viability is more prevalent. The notion of viability was first introduced by Aubin [9]. Viability property provides a very nice theoretical framework for a hybrid controller design problem. Many researchers have considered the problem of viability for the analysis and control of hybrid systems [10–14]. The nonsampling viability problem was examined in the pioneering work of Aubin and coworkers [10] in which impulse differential inclusions are used to describe hybrid behavior. As an important part of hybrid system, studies in the viability theory include two topics. One is to verify viability condition for a given set. Another one is to design a viable solution within a viable set. Viability conditions for a linear control system have been studied widely in recent years; see [15, 16]. A necessary and sufficient viability condition for a differential inclusion was given in [8, 17], but it is a hard work to check that condition in most applications directly. In the literature [10], the authors give the necessary and sufficient condition of the viability, but it is still very difficult to judge quantitatively. Gao in [18] discusses the viability discrimination for an affine nonlinear control system on a smooth region; it gives some results on continuous system. There is certain limitation in the application of the literature [18]. The limitation is that the
On subordination for certain subclass of analytic functions
Liu Jinlin
International Journal of Mathematics and Mathematical Sciences , 1997, DOI: 10.1155/s016117129700029x
Abstract: In the present paper the class Pn[ ±,M] consisting of functions f(z)=z+ ¢ ‘k=n+1 ¢ akzz(n ¢ ‰ ¥1), which are analytic in the unit disc E={z:|z|<1} and satisfy the condition |f ¢ € 2(z)+ ±zf ¢ € 3(z) ¢ ’1| Keywords analytic --- starlike --- convex univalent --- subordination.
Magnetic fields in our Galaxy: How much do we know? (II) Halo fields and the global field structure
Jinlin Han
Physics , 2001, DOI: 10.1023/A:1013102711400
Abstract: I review the large scale global magnetic field structure of our Galaxy, using all information available for disk fields, halo fields and magnetic fields near the Galactic center (GC). In the local disk of our Galaxy, RM and dispersion measure (DM) data of nearby pulsars yield the strength of regular field as 1.8$\mu$G, with a pitch angle of about $8\degr$, and a bisymmetric spiral structure. There are at least four, maybe five, field reversals from the Norma arm to the outskirts of our Galaxy. In the thick disk or Galactic halo, large scale toroidal magnetic fields, with opposite field directions in the Southern and Northern Galaxy, have been revealed by the antisymmetric RM sky towards the inner Galaxy. This signature of the A0 dynamo-mode field structure is strengthened by the indication of a poloidal field of dipole form, that is the transition of the RM signs probably shifted from $l\sim0\degr$ to $l\sim+10\degr$. The local vertical field is probably a part of this dipole field. The field structure of the A0 dynamo-mode strikingly continues towards the region near the GC. In short, the magnetic fields in the Galactic disk have a bisymmetric spiral structure of primordial nature, while in the halo and near the GC the A0 dynamo seems to dominate, so that the fields consist of toroidal fields with opposite directions below and above the Galactic plane and poloidal fields of dipole form.
Magnetic fields in our Milky Way Galaxy and nearby galaxies
JinLin Han
Physics , 2012, DOI: 10.1017/S1743921313002561
Abstract: Magnetic fields in our Galaxy and nearby galaxies have been revealed by starlight polarization, polarized emission from dust grains and clouds at millimeter and submillimeter wavelength, the Zeeman effect of spectral lines or maser lines from clouds or clumps, diffuse radio synchrotron emission from relativistic electrons in interstellar magnetic fields, and the Faraday rotation of background radio sources as well as pulsars for our Milky Way. It is easy to get a global structure for magnetic fields in nearby galaxies, while we have observed many details of magnetic fields in our Milky Way, especially by using pulsar rotation measure data. In general, magnetic fields in spiral galaxies probably have a large-scale structure. The fields follow the spiral arms with or without the field direction reversals. In the halo of spiral galaxies magnetic fields exist and probably also have a large-scale structure as toroidal and poloidal fields, but seem to be slightly weaker than those in the disk. In the central region of some galaxies, poloidal fields have been detected as vertical components. Magnetic field directions in galaxies seem to have been preserved during cloud formation and star formation, from large-scale diffuse interstellar medium to molecular clouds and then to the cloud cores in star formation regions or clumps for the maser spots. Magnetic fields in galaxies are passive to dynamics.
Pulsars as excellent probes for the magnetic structure in our Milky Way
JinLin Han
Physics , 2012, DOI: 10.1017/S174392131202371X
Abstract: In this invited talk, I first discuss the advantages and disadvantages of many probes for the magnetic fields of the Milky Way. I conclude that pulsars are the best probes for the magnetic structure in our Galaxy, because magnetic field strength and directions can be derived from their dispersion measures (DMs) and rotation measures (RMs). Using the pulsars as probes, magnetic field structures in the Galactic disk, especially the field reversals between the arms and interarm regions, can be well revealed from the distribution of RM data. The field strengths on large scales and small scales can be derived from RM and DM data. RMs of extragalactic radio sources can be used as the indication of magnetic field directions in the spiral tangential regions, and can be used as probes for the magnetic fields in the regions farther away than pulsars when their median RMs are compared with pulsar RMs.
Novel Evidence of HBV Recombination in Family Cluster Infections in Western China
Bin Zhou, Zhanhui Wang, Jie Yang, Jian Sun, Hua Li, Yasuhito Tanaka, Masashi Mizokami, Jinlin Hou
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0038241
Abstract: Two hepatitis B virus (HBV) C/D recombinants were isolated from western China. No direct evidence indicates that these new viruses arose as a result of recombination between genotype C and D or a result of convergence. In this study, we search for evidence of intra-individual recombination in the family cluster cases with co-circulation of genotype C, D and C/D recombinants. We studied 68 individuals from 15 families with HBV infections in 2006, identified individuals with mixed HBV genotype co-infections by restriction fragment length polymorphism and proceeded with cloning and DNA sequencing. Recombination signals were detected by RDP3 software and confirmed by split phylogenetic trees. Families with mixed HBV genotype co-infections were resampled in 2007. Three of 15 families had individuals with different HBV genotype co-infections in 2006. One individual (Y2) had a triple infection of HBV genotype C, D and C/D recombinant in 2006, but only genotype D in 2007. Further clonal analysis of this patient indicated that the C/D recombinant was not identical to previously isolated CD1 or CD2, but many novel recombinants with C2, D1 and CD1 were simultaneously found. All parental strains could recombine with each other to form new recombinant in this patient. This indicates that the detectable mixed infection and recombination have a limited time window. Also, as the recombinant nature of HBV precludes the possibility of a simple phylogenetic taxonomy, a new standard may be required for classifying HBV sequences.
Evolution of the class C GPCR Venus flytrap modules involved positive selected functional divergence
Jianhua Cao, Siluo Huang, Ji Qian, Jinlin Huang, Li Jin, Zhixi Su, Ji Yang, Jianfeng Liu
BMC Evolutionary Biology , 2009, DOI: 10.1186/1471-2148-9-67
Abstract: Our results show that the altered selective constraints in the VFTMs of class C GPCRs are statistically significant. This implies that functional divergence played a key role in characterizing the functions of the VFTMs after gene duplication events. Meanwhile, positive selection is involved in the evolutionary process and drove the functional divergence of the VFTMs. Our results also reveal that three continuous duplication events occurred in order to shape the evolutionary topology of class C GPCRs. The five groups of the class C GPCRs have essentially different sites involved in functional divergence, which would have shaped the specific structures and functions of the VFTMs.Taken together, our results show that functional divergence involved positive selection and is partially responsible for the evolutionary patterns of the class C GPCR VFTMs. The sites involved in functional divergence will provide more clues and candidates for further research on structural-function relationships of these modules as well as shedding light on the activation mechanism of the class C GPCRs.The G protein-coupled receptors (GPCRs) are seven transmembrane receptors coupled to G proteins and represent a major group of cell-surface receptors that constitute 3.5% of the genome in vertebrates [1]. These receptors play a major role in intercellular communication and act as receptors for most hormones and neurotransmitters. The GPCRs are involved in the perception of the environment, being activated by taste compounds, pheromones, odorants and even photons [2]. Several classes of the GPCRs have been defined based on sequence similarity [1,3,4]. The class C GPCRs are mainly composed of metabotropic glutamate receptors (mGluRs), gamma-aminobutyric acid type B receptors (GABABRs), Ca2+-sensing receptors (CaSR), taste receptors (T1R), pheromone receptors (V2R) and olfactory receptors[1,2]. They play a key role in the physiology of various types of epilepsy as well as in nociception and drug
The effects of the guide field on the structures of electron density depletions in collisionless magnetic reconnection
San Lu,QuanMing Lu,Yang Cao,Can Huang,JinLin Xie,Shui Wang
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-010-4250-9
Abstract: Two-dimensional particle-in-cell simulations are performed to investigate the formation of electron density depletions in collisionless magnetic reconnection. In anti-parallel reconnection, the quadrupole structures of the out-of-plane magnetic field are formed, and four symmetric electron density depletion layers can be found along the separatrices due to the effects of magetic mirror. With the increase of the initial guide field, the symmetry of both the out-of-plane magnetic field and electron density depletion layers is distorted. When the initial guide field is sufficiently large, the electron density depletion layers along the lower left and upper right separatrices disappear. The parallel electric field in guide field reconnection is found to play an important role in forming such structures of the electron density depletion layers. The structures of the out-of-plane magnetic field By and electron depletion layers in anti-parallel and guide field reconnection are found to be related to electron flow or in-plane currents in the separatrix regions. In anti-parallel reconnection, electrons flow towards the X line along the separatrices, and are directed away from the X line along the magnetic field lines just inside the separatrices. In guide field reconnection, electrons can only flow towards the X line along the upper left and lower right separatrices due to the existence of the parallel electric field in these regions.

Zhu Xinwu,Xu Jinlin,Yang Guangrui,

植物科学学报 , 1986,
Abstract: The results obtained from the present study are quite different from previous reports on the karyotype of Chinese sacred-lily (Narcissus tazetta vat. chinensis Roem). Among'a' chromosomes, form of one of the chromosomes is obviously different from the other two. Three g-chromosomes all have satellite at their short arm, but the form and size of S_3 are obviously different from S_1 and S_2. The authors suggest that Chinese sacred-lily is probably a segmental allotriploid.
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