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Search Results: 1 - 10 of 77327 matches for " Xiao-Feng Tang "
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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.
Functional Insight into the C-Terminal Extension of Halolysin SptA from Haloarchaeon Natrinema sp. J7
Zhisheng Xu, Xin Du, Tingting Li, Fei Gan, Bing Tang, Xiao-Feng Tang
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0023562
Abstract: Halolysin SptA from haloarchaeon Natrinema sp. J7 consists of a subtilisin-like catalytic domain and a C-terminal extension (CTE) containing two cysteine residues. In this report, we have investigated the function of the CTE using recombinant enzymes expressed in Haloferax volcanii WFD11. Deletion of the CTE greatly reduced but did not abolish protease activity, which suggests that the CTE is not essential for enzyme folding. Mutational analysis suggests that residues Cys303 and Cys338 within the CTE form a disulfide bond that make this domain resistant to autocleavage and proteolysis under hypotonic conditions. Characterization of full-length and CTE-truncation enzymes indicates the CTE not only confers extra stability to the enzyme but also assists enzyme activity on protein substrates by facilitating binding at high salinities. Interestingly, homology modeling of the CTE yields a β-jelly roll-like structure similar to those seen in Claudin-binding domain of Clostridium perfringens enterotoxin (clostridial C-CPE) and collagen binding domain (CBD), and the CTE also possesses collagen-binding activity, making it a potential candidate as an anchoring unit in drug delivery systems.
Transcriptome analysis reveals the time of the fourth round of genome duplication in common carp (Cyprinus carpio)
Jin-Tu Wang, Jiong-Tang Li, Xiao-Feng Zhang, Xiao-Wen Sun
BMC Genomics , 2012, DOI: 10.1186/1471-2164-13-96
Abstract: We have sequenced the transcriptome of common carp using 454 pyrosequencing. After assembling the 454 contigs and the published common carp sequences together, we obtained 49,669 contigs and identified genes using homology searches and an ab initio method. We identified 4,651 orthologous pairs between common carp and zebrafish and found 129,984 paralogous pairs within the common carp. An estimation of the synonymous substitution rate in the orthologous pairs indicated that common carp and zebrafish diverged 120 million years ago (MYA). We identified one round of genome duplication in common carp and estimated that it had occurred 5.6 to 11.3 MYA. In zebrafish, no genome duplication event after speciation was observed, suggesting that, compared to zebrafish, common carp had undergone an additional genome duplication event. We annotated the common carp contigs with Gene Ontology terms and KEGG pathways. Compared with zebrafish gene annotations, we found that a set of biological processes and pathways were enriched in common carp.The assembled contigs helped us to estimate the time of the fourth-round of genome duplication in common carp. The resource that we have built as part of this study will help advance functional genomics and genome annotation studies in the future.The Cyprininae family includes zebrafish (Danio rerio) and the several economically important cultivated carp, such as common carp (Cyprinus carpio), grass carp (Ctenopharyngodon idella), silver carp (Hypophthalmichthys molitrix) and bighead carp (Hypophthalmichthys nobilis). Teleosts are widely believed to have gone through an additional round of whole genome duplication referred to as the 3R hypothesis, as compared to mammals. This third round (3R) of whole genome duplication is specific to ray-finned fish and possibly occurred about 360 million years ago (MYA), preceding the divergence of the teleosts [1]. The 3R duplication may have led to the major diversification of the teleosts [2-4]. The chrom
1,1′-(Hexane-1,6-diyl)dipyridinium bis(hexafluorophosphate)
Jin-hua Liang,Dong Jin,Xiao-feng Gao,Jin-tang Wang
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808039639
Abstract: The asymmetric unit of the title compound, C16H22N22+·2PF6 , contains one half-molecule and a hexafluorophosphate anion. In the crystal structure, intermolecular C—H...F hydrogen bonds link the molecules. The F atoms in the hexafluorophosphate anion are disordered over two positions and were refined with occupancies of 0.43 (2) and 0.57 (2).
Ex vivo expansion of tumor-infiltrating lymphocytes from nasopharyngeal carcinoma patients for adoptive immunotherapy
Jia He,Xiao-Feng Tang,Qiu-Yan Chen,Hai-Qiang Mai
Chinese Journal of Cancer , 2012, DOI: 10.5732/cjc.011.10376
Abstract: Establishing Epstein-Barr virus(EBV)-specific cytolytic T lymphocytes(EBV-CTLs) from peripheral blood mononuclear cells(PBMCs) for adoptive immunotherapy has been reported in EBV-associated malignancies including Hodgkin's lymphoma and nasopharyngeal carcinoma(NPC). In the current study, we performed ex vivo expansion of tumor-infiltrating lymphocytes(TILs) obtained from NPC biopsy specimens with a rapid expansion protocol using anti-CD3 monoclonal antibody(OKT3), recombinant human interleukin(IL)-2, and irradiated PBMCs from healthy donors to initiate the growth of TILs. Young TIL cultures comprised of more than 90% of CD3+ T cells, a variable percentage of CD3+CD8+ and CD3+CD4+ T cells, and less than 10% of CD3-CD16+ natural killer cells, a similar phenotype of EBV-CTL cultures from PBMCs. Interestingly, TIL cultures secreted high levels of the Th1 cytokines, interferon gamma (IFNγ) and tumor necrosis factor-alpha (TNF-α), and low levels of the Th2 cytokines, IL-4 and IL-10. Moreover, young TILs could recognize autologous EBV-transformed B lymphoblast cell lines, but not autologous EBV-negative blast cells or allogeneic EBV-negative tumor cells. Taken together, these data suggest that ex vivo expansion of TILs from NPC biopsy tissue is an appealing alternative method to establish T cell-based immunotherapy for NPC.
Nuclear spin polarization in a single quantum dot pumped by two laser beams
Xiao-Feng Shi
Physics , 2013, DOI: 10.1103/PhysRevB.87.195318
Abstract: We theoretically investigate dynamic nuclear spin polarization in a self-assembled quantum dot pumped optically by two laser beams. With the assumption that a noncollinear interaction between the hole spin and nuclear spins leads to nuclear spin polarization, we find that both weak and strong nuclear spin polarizations can arise, depending on the intensities and central frequencies of the lasers. For weak nuclear spin polarization, we use a perturbation method to show that the distribution of the nuclear spin Overhauser field may become significantly narrower. Using Monte Carlo simulations to study a single quantum dot, we find that strong nuclear spin polarization can also be generated via appropriate optical pumping.
Pre-management of Disentanglement
Xiao-Feng Qian
Mathematics , 2012, DOI: 10.1088/1751-8113/47/26/265304
Abstract: We define threshold disentanglement (TD) as the level above which entanglement must be maintained for later use and calculate the values of quantum system parameters at $t=0$ that will ensure that the threshold is not crossed in a specified time. An important issue is the possibility of non-smooth, typically non-exponential, decay of entanglement into the state of complete disentanglement (CD). Given a specified operation time $\tau$, we determine phase diagrams showing entanglement preservation during the evolution of a generic two-qubit mixed state as a function of selected initial parameters such as concurrence and excitation probabilities. In other words, disentanglement can be pre-managed through these parameters. Three common relaxation processes - amplitude, phase and depolarization - are considered.
Novel concept of recycling sludge and dust to BOF converter through dispersed in-situ phase induced by composite ball explosive reaction
Fu-ping Tang,Shu-juan Yu,Peng Fei,Hou-yu Hou,Feng Qian,Xiao-feng Wang
- , 2017, DOI: https://doi.org/10.1007/s12613-017-1471-9
Abstract: Recycling of iron and steelmaking dusts is a key issue in environmental protection efforts and to ensure efficient utilization. In this investigation, we developed a novel recovery process that uses a dispersed in-situ phase induced by an explosive reaction of composite balls of iron and steelmaking dusts. We designed and prepared composite balls for this function using a laboratory model batch-type balling disc (at 12 r/min) and optimized the feeding modes in 180-t and 260-t basic oxygen furnace (BOF) converters. The results indicate that feeding composite balls into BOF converters is an effective novel technology for recovering iron and steelmaking dusts. The period after hot metal charging and prior to the oxygen-blowing process is the most reasonable time to feed composite balls. Composite ball treatment is not appropriate for steel production with sulfur requirements lower than 80 ppm. The maximum composite ball feeding amount is 40 kg/t and the iron yield rate is better than 95%. Compared with the conventional recycling process of sludge and dust, this novel technology is more convenient and efficient, saving up to 309 RMB per ton of steel. Further investigation of this novel recycling technology is merited.
Positive-Negative Emotional Categorization of Clothing Color Based on Brightness  [PDF]
Xiao-Feng Jiang, Xiao-Pei Bian
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510B040
Abstract:

In current study, behavioral measures were conducted to investigate clothing color. The purpose was to focus on the rule that color brightness influencedpositive-negative emotional categorization. Results showed that the effect of brightness on clothing color emotion categorization was significant. With the increase of brightness, the variation curve of positive emotion appears to be a “U-shaped”, whereas that of the negative emotion shows an upside down “U-shaped”. Compared with the low brightness colors, the emotion reaction to the high brightness colors was more positive; Most of the colors with different brightness scales were classified as positive emotions and the minors were classified as negative emotions; the positive colors could be done much faster than the negative ones.

Study on Evaluation Method of Aluminum alloy Pulse MIG Welding Stability Based on Arc Voltage Probability Density  [PDF]
Jing Nie, Xiao-Feng Meng, Yu Shi
Journal of Signal and Information Processing (JSIP) , 2011, DOI: 10.4236/jsip.2011.23020
Abstract: Bring forward a new analytical method in order to evaluate the stability of the process of aluminum alloy pulsed MIG welding. The ratio of the first and the second peak in arc voltage signal probability density was selected to evaluate aluminum alloy pulse MIG welding stability. By calculating the arc voltage signal probability density from 80 sets of welding experiments, the ratio of the two peaks in arc voltage probability in every set was captured. And the evaluation system of aluminum alloy pulse MIG welding stability was established. The smaller the ratio of peaks in arc voltage signal probability density is, the better the stability of the welding will be; the bigger the ratio of peaks in arc voltage signal probability density is, the poorer the stability of the welding will be.
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