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Dou Wang,
Jie Gao,
Ming Xiao,
Huiping Geng,
Yuanyuan Guo,
Shouyan Xu,
Na Wang,
Yuwen An,
Qing Qin,
Gang Xu, Sheng Wang
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ABSTRACT: In this paper we will show a general method of how to make an optimized
parameter design of a circular e+e- Higgs Factory by using analytical
expression of maximum beam-beam parameter and beamstrahlung beam lifetime
started from given design goal and technical limitations. A parameter space has
been explored. Based on beam parameters scan and RF parameters scan, a set of
optimized parameter designs for 50 km Circular Higgs Factory (CHF) with
different RF frequency was proposed.
04/2013;
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ABSTRACT: For the Rapid Cycling Synchrotron of China Spallation Neutron Source
(CSNS/RCS), the stripping foil scattering generates the beam halo and gives
rise to additional beam losses during the injection process. The interaction
between the proton beam and the stripping foil was discussed and the foil
scattering was studied. A simple model and the realistic situation of the foil
scattering were considered. By using the codes ORBIT and FLUKA, the multi-turn
phase space painting injection process with the stripping foil scattering for
CSNS/RCS was simulated and the beam losses due to the foil scattering were
obtained.
10/2012;
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ABSTRACT: The injection system of the China Spallation Neutron Source uses H- stripping
and phase space painting method to fill large ring acceptance with the linac
beam of small emittance. The emittance evolution, beam losses, and collimation
efficiency during the injection procedures for different injection parameters,
such as the injection emittances, starting injection time, twiss parameters and
momentum spread, were studied, and then the optimized injection parameters was
obtained. In addition, the phase space painting scheme which also affect the
emittance evolution and beam losses were simulated and the optimization range
of phase space painting were obtained. There will be wobble in the power supply
of the injection bumps, and the wobble effects were presented. In order to
study the transverse coupling, the injection procedures for different betatron
tunes and momentum spreads were studied.
10/2012;
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ABSTRACT: The China Spallation Neutron Source (CSNS) uses H- stripping and phase space
painting method to fill large ring acceptance with the linac beam of small
emittance. The dependence of the painting beam on the injection beam parameters
was studied for the Rapid Cycling Synchrotron (RCS) of CSNS. The injection
processes for different momentum spread, rms emittance of the injection beam,
injection beam matching were simulated, then the beam losses, 99% and rms
emittances were obtained and the optimized ranges of injection beam parameters
were given. The interaction between the H- beam and the stripping foil was
studied and the foil scattering was simulated. Then, the stripping efficiency
was calculated and the suitable thickness of the stripping foil was obtained.
The energy deposition on the foil and the beam losses due to the foil
scattering were also studied.
08/2012;
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ABSTRACT: We present simultaneous electrical and optical measurements on individual ZnO nanowires and demonstrate the influence of the electric field on the luminescence characteristics and the joule heating induced temperature increase. The external electric field of 106 V/m causes red shift and reduced intensity of the near band edge emission, consistent quantitatively with the quadratic Stark effect. The temperature increase, monitored by confocal Raman spectroscopy, shows pronounced dependence on the nanowire diameter and becomes dramatic for nanowires with diameters smaller than 100 nm. The emission red shifts are mainly caused by the joule heating for small diameter nanowires but by the electric field for large diameter nanowires. Based on the above results, the implications for device applications are discussed.
03/2011;
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ABSTRACT: The electronic transport through a side-coupled triple quantum dot array (QDA) is investigated by means of Green function technique within the tight-binding framework. We obtain the formula of the linear conductance of QDA. The linear conductance spectrum is numerically studied. We discuss the feasibility of applying our structure to the electron spin polarized device and calculate the ratio of the spin polarized current flows.
Physics Letters A. 01/2008; 3722163(73).
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ABSTRACT: BaTiO3-based ultrafine nonreducible dielectrics for multilayer ceramic capacitors were prepared by a newly developed nanocomposite
doping process. According to TG-DTA, XRD and TEM analysis, the nanocomposite dopants via sol–gel method were uniform and well
dispersive. The micromechanism was investigated based on comparing conventional process with nano-doping process. It indicated
that due to the special nano-effect, doping effect of additives became more effective and the microstructure and dielectric
properties of ceramics were improved. The results showed that high performance dielectrics satisfying X8R specification were
achieved, with high dielectric constant of 2,900, low dielectric loss of 0.6% and large insulation resistivity of 1012Ωcm.
Journal of Materials Science 02/2007; 42(6):2090-2096. · 2.02 Impact Factor
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ABSTRACT: Boundedness of components of the Fatou sets of iteration of tran-scendental entire or meromorphic functions are investigated in this paper.
TAIWANESE JOURNAL OF MATHEMATICS 01/2007; 10:1603-1614. · 0.56 Impact Factor
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ABSTRACT: The 3′ untranslated regions deeply affect many properties of eukaryotic mRNA. In plants, the polyadenine control signals contained in these regions seem to be more variable than of mammals. Three cDNA libraries derived from the leaf, endosperm and stem tissues of rice were sequenced from the 3′-end. Of the 9911 transcripts analyzed, 5723 unique transcripts were identified from the leaf sequences, 2934 from the endosperm and 1254 from the stem. The information entropy and two statistical methods were used to compile a list of rice poly(A) control signals. Based on their distribution, these signals can be roughly grouped into far-upstream element (FUE), near-upstream element (NUE), T-rich region (TRE) and downstream element (DE). The distribution of rice conserved regions is similar to the previous model from Arabidopsis and yeast, with a few differences in word constructions. Interestingly, we also found the word distributions were diverse in the cleavage site of downstream sequences of different rice tissues. The signal bias in downstream sequences may lead mRNA to be differently cleaved in different rice tissues.
12/2006;
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ABSTRACT: The microstructure and dielectric properties of Yb-Mn- and Yb-Ni-substituted BaTiO3 ceramics are investigated in this paper. Both Yb-Mn- and Yb-Ni-substituted BaTiO3 ceramics satisfy the X8R specification (−55 ∘C to 150 ∘C, Δ C = ±15% or less) for automotive application when CaZrO3 is incorporated in the formulations. It is found that both Mn and Ni ions can suppress the diffusion of Yb and CaZrO3 into BaTiO3 grains, resulting in formation of core-shell structures in the grains. It is found that Mn is more favorable to stabilize
the core-shell structure in BaTiO3 ceramics as compared with Ni.
Journal of Materials Science Materials in Electronics 09/2005; 16(10):669-672. · 1.08 Impact Factor
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ABSTRACT: A new route was developed to produce high-performance nonreducible (Ba,Ca)(Ti,Zr)O3 (BCTZ) ceramics, in which sol-gel derived complex dopants were applied to ultrafine (Ba0.97Ca0.03)1.001(T{i}0.80Zr0.20)O3 powders. The effect of calcination temperature on the complex dopants, as well as the effect of complex dopants on the BCTZ ceramics was investigated. The micro-strain, Curie point, dielectric loss and maximum dielectric constant at the Curie point of the resulting BCTZ ceramics all decrease with increasing mean crystallite size as the calcination temperature of the complex dopants increases. It is suggested that the above results are presumably due to the downsizing of the agglomerates of the complex dopants during calcination. The effectiveness of the present route to improve the dielectric constant and loss of the BCTZ ceramics simultaneously has been verified in comparison to the conventional mixed oxide route. This new route is very promising for practical use in Ni-electrode multi-layer ceramic capacitors (Ni-MLCCs) with large capacitance.
Journal of Materials Science Materials in Electronics 04/2005; 16(5):257-261. · 1.08 Impact Factor
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ABSTRACT: Sampling technology has been widely deployed in network measurement systems to control memory consump-tion and processing overhead. However, most of the existing methods suffer from large errors for the estimation of small-size flows. To address this problem, we propose an adaptive non-linear sampling (ANLS) method for flow size estimation. Instead of statically pre-configuring the sampling rate, ANLS dynamically adjusts the sampling rate for each flow according to the value of a corresponding counter. A smaller sampling rate is utilized when the counter value is large, while a larger sampling rate is employed for a smaller counter. In this paper, the unbiased flow size estimation, the relative error, and the required counter size are studied through theoretical analysis and experimental evaluations. The analysis and experiments demonstrate that ANLS can significantly improve the estimation accuracy (particularly for small-size flows), and save memory consumption, while maintaining processing overhead comparable to existing methods. Moreover, we validate the design of ANLS by implementing an FPGA-based prototype, which is capable of measuring traffic throughput up to 26.5 Gbps.
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ABSTRACT: With the research on some critical technology going deeply, the problem of technology route and project approach for the saving energy & reducing consumption have become the focus of municipal wastewater treatment process. In this article, LCA (Life Cycle Analysis) is applied to identify and compare the energy consumption of each stage of different technologies in municipal wastewater treatment from the view of whole process. This is carried out after reviewing the condition of energy utilizing of typical technologies in China. And some measures are brought forward to improve the efficiency of energy utilizing. Integrated Oxidation Ditch (IOD) is taken as an example and the energy consumption from its raw and processed materials exploitation, construction, treatment and running, rebuilding to its discarding and removing is identified and quantified, which is also compared with traditional treatment process of wastewater and waste sludge in China. This study shows that application of the high-energy-efficiency aeration device and optimizing control operation are essential paths to improve the energy consumption of IOD during its life cycle. And LCA is an important foundation of improving products quality and a main measure of sales promotion for manufacturers in recent years.
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ABSTRACT: Transfer pricing can be used as a strategic instrument to accomplish those objectives that enterprises pursue within the context of multi-divisional organization. This paper analyses the use of transfer pricing for decentralized multinational enterprises (MNEs) as a strategic instrument to tackle the issues of brand proliferation. The centralized headquarters' prior action on setting transfer pricing is to backup the decentralized subsidiaries in their output decision-making. It shows that the higher transfer pricing has enabled easier collusion amongst the brand's agencies in developing an intra-brand competition model. With regard to the level of transfer pricing, this hinges upon the strength of intra-brand competition and inter-brand competition which are expressed in opposite direction. It also demonstrates that the optimal transfer pricing is affected by any difference in tax rates between two countries. (In the case where tax rates are the same, there is no effect on transfer pricing strategy). With the rapid growth of multinational enterprises (MNEs), the pricing of internal transactions undertaken by MNE's headquarters is a tax issue that tax authorities are concerned about but it is also a strategic concern of MNE in supporting its local subsidiaries in brand proliferation and output decision, as the MNEs have the incentive to manipulate their transfer prices in order to shift profit "cross-border", so that they may minimize their tax burden. Ramy Elitzur and Jack Mintz (1996) discussed corporate tax competition that is subject to a transfer pricing rule, and argued that tax will be reduced when harmonization is taken into consideration. Pascalis Raimondos-Møller and Kimberley Scharf (2002); Kimberly A. Clausing (2003) looked into the issue of government optimal tax policy in the presence of that of another active government. Will Yancey and Karen Cravens (1998) and Eric J. Bartelsman, and Roel M.W.J Beetsma (2003) provided an overview of the tax planning strategy process. Transfer pricing legislation is normally based on the concept of the Arm's Length standard (ALS) which says that all MNEs' intra-corporate activities should be priced as if they took place between unrelated parties in competitive markets (Lorraine Eden et al., 2001). Yuka Sakurai (2002), Moller and Scharf (2002) focused on direct regulation of transfer prices, rather than the selective use of optimal taxes in an environment characterized by transfer prices as constrained by exogenous rules. Besides a purely tax-driven mechanism, transfer pricing is often used by the enterprise in achieving competitive advantage and other strategic objectives as well. 1 Laixun Zhao (2000) constructed a model of a partially decentralized multinational firm in competition with a rival firm, and showed that transfer pricing can be used as a rent-shifting device by the MNE to compete with rival companies. Göx (2000) analyzed the use of transfer pricing as a strategic device in divisionalized firms facing duopolistic price competition. Søren B. Nielsen et al. (1999) treated it as a strategic instrument in an oligopolistic final goods market. In the literature of product proliferation, Richard J. Gilbert and Carmen Matutes (1993) pointed out that brand proliferation is a credible entry-deterring strategy if thetw. The authors would like to thank Yih-Luan Chyi for very useful suggestions. 1 The strategic objectives of international transfer pricing fall into three areas: (i) taxation-related objectives; (ii) internal management-oriented objectives; and (iii) international or operational objectives which were surveyed by Karen S. Cravens (1997).
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ABSTRACT: A series of near-infrared (NIR) electrochromic and electroluminescent polymers containing the pendant dinuclear ruthenium complexes were synthesized and characterized. All the polymers are near-infrared (NIR) electrochromic, displaying an intense absorption centered at 1600 nm upon oxidation to the mixed-valence state. Single-layer diode devices comprising a layer of the complex polymers sandwiched between the ITO and Au electrodes emitted the NIR light centered at 790 nm at ambient temperature.
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Sheng Wang,
Lihuan Zhang,
Zhiyong Zhang,
Li Ding,
Qingsheng Zeng,
Zhenxing Wang,
Xuelei Liang,
Min Gao,
Jun Shen,
Huilong Xu,
Qing Chen,
Rongli Cui,
Yan Li,
Lian-Mao Peng
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ABSTRACT: Photovoltaic effects are studied for asymmetrically contacted single-walled carbon nanotube (SWCNT) barrier-free bipolar diode (BFBD) under infrared laser illumination. The BFBD is based on a SWCNT with a diameter d ∼ 1.5 nm and length L ∼ 800 nm, and the device shows a good open-circuit voltage of V OC) 0.23V and large photocurrent I SC of more than 15 nA.
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ABSTRACT: The purpose of this study is to determine the growth performance and immune characteristics of early weaned piglets receiving rice bran expressing porcine lactoferrin as a feed additive. Full-length cDNA encoding porcine lactoferrin (LF) driven by a rice actin promoter was transformed into rice plants, and its integration into the rice genome was verified by Southern blot analysis. The expression of recombinant LF (rLF) in whole grains and rice bran was also confirmed, and the amount of rLF accumulated in rice bran was estimated by immunoblot assay to be approximately 0.1% of rice bran weight. An iron-binding assay showed that the rLF retained iron-binding activity and the binding capacity of 1 mg/mL rLF would be saturated by 100 μM of FeCl 3 . Thirty-six early weaned piglets at 21 days old were randomly selected into two groups and fed a diet containing 5% transgenic rice bran containing 50 mg/kg rLF (rLF group) and 5% rice bran (control group) to investigate the piglets' growth performance and immune characteristics. The results showed no significant difference in growth performance between the groups during the feeding period. However, the aerobic bacteria, anaerobic bacteria, and coliform counts in the cecal contents of the rLF-fed group were significantly lower than those of the control group. Additional immune characteristics such as the IgG concentration in the rLF group was higher than the control group at the 28th day, but leukocyte counts and the peripheral lymphocyte ratio remained similar. In summary, porcine LF expressed in rice bran, a byproduct of rice, can be used as a functional additive to improve antimicrobial capabilities and IgG concentration of early weaned piglets.
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ABSTRACT: China Spallation Neutron Source (CSNS) accelerator consists of a 80 MeV linac and a 1.6 GeV Rapid Cycling Synchrotron (RCS), which is designed to produce beam power of 100 kW with a repetition rate of 25 Hz. For such a high intensity RCS, beam loss and control are of primary concern. A two-stage collimation system is designed to localize the beam losses in a restricted area, and keep the uncontrolled losses less than 1 W/m at the other part of RCS. The detailed design of the beam collimation system is presented, including the compare among different schemes. Key issues which affect the collimation efficiency are analyzed, and the collimation efficiency and beam loss distribution are studied by using the code ORBIT.
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ABSTRACT: Most approaches for protein structure alignment start from a search for similar fragments since this local similarity is necessary to the alignment even though is insufficient. In contrary to the sequence alignment, any insignificant trial alignment for structures can be detected by structure superposition and then excluded. It is then practicable to select from locally similar fragments those responsible for alignment and build up it. An efficient way for local similarity search is to use a conformational alphabet, which is a discretized description of protein chain local geometry. Using our conformational alphabet and its substitution matrix CLESUM, we propose a tool called BLOMAPS for fast multiple structure alignment. By means of the conformational alphabet, a structural fragment is mapped to a string, and two strings with their CLESUM score being higher than a preset threshold form a similar fragment pair (SFP). A string from one protein as a seed and its highly similar fragments from other proteins form a similar fragment block. Taking one protein as the pivot, BLOMAPS uses the rigid transformation for SFPs in a block to superimpose proteins and initiate an anchor-based alignment. BLOMAPS is greedy in nature, guided by CLESUM similarity scores. It consists of several steps including finding similar fragment blocks based on a pivot protein, removing block redundancy, constructing scaffold by checking consistency in spatial arrangement among fragments from different blocks, dealing with unanchored structures, and the final step of refinement where the average template for alignment is obtained and motifs missing from the pivot protein are found and added. The utility of BLOMAPS is tested on various protein structure ensembles including large scale ones, and compared with several other tools including MATT.
