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Search Results: 1 - 10 of 114473 matches for " YANG Xiao-Feng "
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The wave-corpuscle properties of microscopic particlesin the nonlinear quantum-mechanical systems  [PDF]
Xiao-feng Pang
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.37083
Abstract: We debate first the properties of quantum mechanics and its difficulties and the reasons resulting in these diffuculties and its direction of development. The fundamental principles of nonlinear quantum mechanics are proposed and established based on these shortcomings of quantum mechanics and real motions and interactions of microscopic particles and backgound field in physical systems. Subsequently, the motion laws and wave-corpuscle duality of microscopic particles described by nonlinear Schr?dinger equation are studied completely in detail using these elementary principles and theories. Concretely speaking, we investigate the wave-particle duality of the solution of the nonlinear Schr?dinger equation, the mechanism and rules of particle collision and the uncertainty relation of particle’s momentum and position, and so on. We obtained that the microscopic particles obey the classical rules of collision of motion and satisfy the minimum uncertainty relation of position and momentum, etc. From these studies we see clearly that the moved rules and features of microscopic particle in nonlinear quantum mechanics is different from those in linear quantum mechanics. Therefore, nolinear quantum mechanics is a necessary result of development of quantum mechanics and represents correctly the properties of microscopic particles in nonlinear systems, which can solve difficulties and problems disputed for about a century by scientists in linear quantum mechanics field.
Bistatic RCS Prediction for Complex Targets Using Modified Current Marching Technique
Xiao-Feng Li;Yong-Jun Xie;Rui Yang
PIER , 2009, DOI: 10.2528/PIER09030804
Abstract: The improved high-frequency method for solving the bistatic scattering from electrically large conductive targets is presented in this paper. Since the previous physical optical methods overlooked the current impact of shadow zone and led to the increasing problems of the large angle bistatic calculation, the improved method is deduced by introducing the current marching technique into the conventional physical optical method. Combined with the graphical-electromagnetic computing method that extracted the illuminated and shadow facet in accordance with the direction of the incident sort iteration, one may calculate the bistatic radar cross-section of a conductive targets object. The numerical results show that this method is efficient and accurate.
High-Frequency Method Analysis on Scattering from Homogenous Dielectric Objects with Electrically Large Size in Half Space
Xiao-Feng Li;Yong-Jun Xie;Rui Yang
PIER B , 2008, DOI: 10.2528/PIERB07103001
Abstract: The high-frequency method for solving the scattering from homogeneous dielectric objects with electrically large size in half space is presented in this paper. In order to consider the scattering fields of the targets in half space, the half-space physical optics method is deduced by introducing the half-space Green's function into the conventional physical optics method (PO). Combined with the graphical-electromagnetic computing method to read the geometry information of all visible facets, the equivalent currents and the reflection coefficients are utilized to account of the homogenous dielectric objects with half-space physical optics method in half space. The numerical results show that this method is efficient and accurate.
Tetraaquabis(N,N-dimethylformamide-κO)zinc(II) bis[(2-{3-[2-(carboxylatomethoxy-κ2O,O′)phenyl]pyrazol-1-yl-κN2}acetato-κO)chloridozincate(II)]
Jie Yang,Lei Shen,Cheng Ji,Xiao-Feng Shen
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812023045
Abstract: The asymmetric unit of the title compound, [Zn(C3H7NO)2(H2O)4][Zn(C13H10N2O5)Cl]2, is composed of a single anion and half a cation. The ZnII atom in the monoanion has a distorted triganol–pyramidal geometry, being coordinated by three O atoms and one N atom from one 2-{3-[2-(carboxylatomethoxy)phenyl]pyrazol-1-yl}acetate ligand and one Cl atom. In the dication, the ZnII atom is located on an inversion center and is coordinated by six O atoms in a slightly distorted octahedral geometry. In the crystal, the ions are linked by O—H...O hydrogen bonds, forming a two-dimensional network lying parallel to the ab plane. There are also C—H...O and C—H...Cl interactions present, which lead to the formation of a three-dimensional structure.
MicroRNAs and Toll-like Receptor/Interleukin-1 Receptor Signaling
Virtue Anthony,Wang Hong,Yang Xiao-feng
Journal of Hematology & Oncology , 2012, DOI: 10.1186/1756-8722-5-66
Abstract: The discovery of miRNAs has revolutionized the way we examine the genome, RNA products, and the regulation of transcription and translation. Their ability to modulate protein expression through mRNA degradation and translation repression resulted in avid scientific interest in miRNAs over the past decade. This research has led to findings that indicate miRNAs can regulate an array of cellular functions such as cellular apoptosis, proliferation, differentiation, and metabolism. Specifically, the capability of miRNAs to finely-tune gene expression naturally lends itself to immune system regulation which requires precise control for proper activity. In fact, abnormal miRNAs expression is often seen with inflammatory disorders like rheumatoid arthritis, systemic lupus erthematosus, experimental autoimmune encephalomyelitis, and inflammatory cancers. As a result, research investigating miRNAs modulation of immune cell proliferation, differentiation, and cellular signaling has yielded fruitful results. Specifically, in this review, we will examine the impact of miRNAs on toll-like receptor (TLRs) and interleukin-1β (IL-1β) signaling, which are integral in the proper functioning of the innate immune system. These signaling pathways share several key downstream signaling adaptors and therefore produce similar downstream effects such as the production of pro-inflammatory cytokines, chemokines, and interferons. This review will examine in depth the specific interactions of miRNAs with receptors, adaptor molecules, and regulator molecules within these cellular pathways. In addition, we will discuss the modulation of miRNAs’ expression by TLR and IL-1R signaling through positive and negative feedback loops.
Developmental patterns and characteristics of epicardial cell markers Tbx18 and Wt1 in murine embryonic heart
Bin Zeng, Xiao-feng Ren, Feng Cao, Xiao-yang Zhou, Jing Zhang
Journal of Biomedical Science , 2011, DOI: 10.1186/1423-0127-18-67
Abstract: Mouse embryonic hearts were collected at different stages for immunofluorescence costaining with either Tbx18 and the cardiac transcription factor Nkx2.5 or Wilms tumor 1 (Wt1) and Nkx2.5.Tbx18 and Wt1, but not Nkx2.5, were expressed in the proepicardium and epicardium. Tbx18 was expressed in cells within the heart from E10.5 to at least E14.5; these Tbx18-expressing cells were Nkx2.5 positive, except for a few cells that were Nkx2.5 negative at E14.5. Wt1 was expressed in cells within the heart from E12.5 to at least E14.5, but these Wt1-expressing cells were Nkx2.5 negative.The data obtained in this study demonstrate that Tbx18 is expressed in the cardiomyocytes from E10.5 to at least E14.5, and Wt1 is expressed within the heart from E12.5 to at least E14.5, but not in the cardiomyocyte. These findings may provide new insights on the role of the epicardial cells in cardiac regeneration.During embryogenesis, cells from the proepicardium migrate onto the myocardium to form the epicardium. The proepicardium is a source of undifferentiated progenitor cells that give rise to endothelial cells, fibroblast cells, and the smooth muscle cells that form the coronary vessels during development of the heart [1-3]. The epicardium is the outermost epithelial cell layer overlying the vertebrate heart and was considered historically to be a simple derivative of the proepicardium. However, a series of studies have demonstrated the importance of the epicardium in the development of the heart and in the formation of the coronary vascular system [4,5]. Recently, it was found that the zebrafish epicardium supports cardiac regeneration during the epithelial-to-mesenchymal transition (EMT) and subsequent migration into the myocardium to form new vasculature [6], demonstrating that it could potentially mediate cardiac regeneration after injury in lower vertebrates. Most recently, Tbx18- or Wt1-expressing epicardium was suggested to provide a substantial contribution to myocytes in the ve
catena-Poly[[[diaquacopper(II)]-bis[μ-1,1′-(butane-1,4-diyl)diimidazole-κ2N3:N3′]] dinitrate]
Xiao-Feng Wang,Jin-Feng Wang,Xiao-Yang Liu
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808027281
Abstract: In the title compound, {[Cu(C10H14N4)2(H2O)2](NO3)2}n, the CuII ion lies on an inversion center and is six-coordinated in an octahedral environment by four N atoms from four different 1,1′-butane-1,4-diyldiimidazole ligands and two O atoms from the two water molecules. Bridging by the ligands results in a ribbon structure. Adjacent ribbons are linked to the nitrate anions via O—H...O hydrogen bonds, forming layers. One nitrate O atom is disordered equally over two positions.

KANG Xiao-feng,WANG Nai bin,YANG Xiao huan,

资源科学 , 2002,
Abstract: During the past years, crop yield estimation has gained increasing concerns within scientific literature of China and quite a few of them are devoted to methods for crop area estimation, which deeply concerns with the crop yield. Apparently, the fast development of computer technology and GPS has contributed a lot to the estimation methods. After reviewing the several systems for yield estimation, a new method for information extraction is proposed. The two important aspects of this new method are taking coherence test on statistical data and defining different sampling lines according to different regions. Furthermore, we propose the sample line buffer model, a new method that is supposed to enrich the theoretical bases of crop yield estimation system.
Inflammatory and Autoimmune Reactions in Atherosclerosis and Vaccine Design Informatics
Michael Jan,Shu Meng,Natalie C. Chen,Jietang Mai,Hong Wang,Xiao-Feng Yang
Journal of Biomedicine and Biotechnology , 2010, DOI: 10.1155/2010/459798
Abstract: Atherosclerosis is the leading pathological contributor to cardiovascular morbidity and mortality worldwide. As its complex pathogenesis has been gradually unwoven, the regime of treatments and therapies has increased with still much ground to cover. Active research in the past decade has attempted to develop antiatherosclerosis vaccines with some positive results. Nevertheless, it remains to develop a vaccine against atherosclerosis with high affinity, specificity, efficiency, and minimal undesirable pathology. In this review, we explore vaccine development against atherosclerosis by interpolating a number of novel findings in the fields of vascular biology, immunology, and bioinformatics. With recent technological breakthroughs, vaccine development affords precision in specifying the nature of the desired immune response—useful when addressing a disease as complex as atherosclerosis with a manifold of inflammatory and autoimmune components. Moreover, our exploration of available bioinformatic tools for epitope-based vaccine design provides a method to avoid expenditure of excess time or resources.
ApoG2 induces cell cycle arrest of nasopharyngeal carcinoma cells by suppressing the c-Myc signaling pathway
Zhe-Yu Hu, Jian Sun, Xiao-Feng Zhu, Dajun Yang, Yi-Xin Zeng
Journal of Translational Medicine , 2009, DOI: 10.1186/1479-5876-7-74
Abstract: We found that ApoG2 significantly suppressed the expression of c-Myc in NPC cells and induced arrest at the DNA synthesis (S) phase in a large percentage of NPC cells. Immunoblot analysis showed that expression of c-Myc protein was significantly downregulated by ApoG2 and that the expression of c-Myc's downstream molecules cyclin D1 and cyclin E were inhibited whereas p21 was induced. To further identify the cause-effect relationship between the suppression of c-Myc signaling pathway and induction of cell cycle arrest, the expression of c-Myc was interfered by siRNA. The results of cell cycle analysis showed that the downregulation of c-Myc signaling pathway by siRNA interference could cause a significant arrest of NPC cell at S phase of the cell cycle. In CNE-2 xenografts, ApoG2 significantly downregulated the expression of c-Myc and suppressed tumor growth in vivo.Our findings indicated that ApoG2 could potently disturb the proliferation of NPC cells by suppressing c-Myc signaling pathway. This data suggested that the inhibitory effect of ApoG2 on NPC cell cycle proliferation might contribute to its use in anticancer therapy.Nasopharyngeal carcinoma (NPC) is an epithelial squamous cell carcinoma endemic in Southeast Asia and parts of Mediterranean and northern Africa [1]. Radiotherapy alone cures more than 90% of cases of stage I NPC; however, patients with advanced disease tend to experience therapy failure. Several groups have shown that the 5-year survival rate for concurrent chemotherapy and radiotherapy is higher than that for radiotherapy alone in patients with advanced disease [2,3]. Currently, cisplatin combined with 5-fluorouracil is the first-line chemotherapeutic regimen for NPC. Although this regimen has manageable toxic effects and has yielded response rates ranging from 65% to 75% [4], an urgent need for inpatient administration of chemotherapy has accelerated the development of newer, more tolerable and potent platinum-based regimens. We previously
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