Search

We study the CP-odd and CP-even observables of the $B$ mesons decaying into a baryon and antibaryon. We estimate these observables through the $^3P_0$ model and chiral selection rule. The decay branching ratios of $ B^+ \to p \overline{\Lambda}$ and $ B^0 \to p \overline{p}$ are calculated to be $2.31 \times 10^{-7}$ and $1.27 \times 10^{ -8} $, which are consistent with the current experiments, respectively. The effects of the $B-\overline{B}$ oscillations are considered, which largely suppress the direct CP asymmetries in the $B_s^0$ decays. We suggest the experiments to visit $B_s^0 \to \Lambda(\to p \pi^-) \overline{\Lambda} (\to \overline{ p} \pi^+) $, where the time-averaged CP-odd observables are estimated to be large. The direct CP asymmetries of $B^+ \to p \overline{\Lambda}$ and $B^0 \to p\overline{p}$ are found to be $26.2\%$ and $-3.1\%$ for a positive strong phase and $-36.9\%$ and $4.2\%$ for a negative strong phase, respectively., Comment: 14 pages, 2 figures

Additional file 5: Table S1. Primer sequences for qRT-PCR.

Supplementary Material 1

Posterior atlantoaxial fixation with screw rod forms an approximate "II" shape or "H" increasing transverse link for better stability. In order to improve stability and in consideration of difficult placement of transverse connecting rod, possibility of inadequate bone graft, some scholars have preliminarily researched biomechanics of a novel crossed rod as an approximate "X" configuration of screw rod.The aim of this study was to evaluate and compare the biomechanics of the crossed and parallel rod configurations in the screw rod system for posterior atlantoaxial fixation on a cadaveric model.Six fresh cervical specimens were used to complete the range of motion (ROM) testing by applying pure moments of ± 2.0 nm. Following intact state and under destabilization testing, screws were implanted. The specimens were then tested in the following sequence: Group BLS + PR (C2 bilateral laminar screws + parallel rod), Group BLS + CR (C2 bilateral laminar screws + crossed rod), LPRLS + PR (C2 left pedicle screw and right laminar screw + parallel rod), LPRLS + CR (C2 left pedicle screw and right laminar screw + crossed rod), BPS + PR (C2 bilateral pedicle screws + parallel rod) and BPS + CR (C2 bilateral pedicle screws + crossed rod). The ROM of the C1-2 segments was measured in flexion-extension, lateral bending and axial rotation. Six surgical constructs were compared between the groups and with intact condition, respectively.The six fixed modes significantly increased stability compared with both the intact and destabilization group in flexion-extension, lateral bending and axial rotation (p .05). In extension, BPS + CR and BLS + CR showed greater stability than BLS + PR (p .05). During flexion, the six fixation methods showed no statistical significance (p .05). In left lateral bending, stability of the other five screw rod fixation techniques significantly increased when compared with BLS + PR (p .05). In the right lateral bending direction, the stability of BLS + PR was worse than that of BPS + CR and BPS + PR (p .05). In the left axial rotation, stability of BLS + CR, LPRLS + CR and BPS + CR was greater than that of BLS + PR, LPRLS + PR and BPS + PR (p .05). In the right axial rotation, the stability of BPS + CR and BLS + CR was greater than that of BLS + PR (p .05).The six investigated fixation methods provide sufficient biomechanical stability. The crossed rod configuration can further enhance the axial rotation stability of the screw rod system, which consists of C1 bilateral pedicle and C2 pedicle, or C2 lamina screws. The crossed rod can also improve the stability of the screw rod system made up of C1 bilateral pedicle and C2 lamina screws in lateral bending and extension. The crossed rod configuration is reliable and provides superior stability for clinical application.

We evaluated the effects of hesperidin on the nonspecific immunity, antioxidant capacity and growth performance of red swamp crayfish (Procambarus clarkii). A total of 900 healthy crayfish were randomly divided into six groups: the control group (fed the basal diet) and the HES25, HES50, HES75, HES100 and HES150 groups, which were fed the basal diet supplemented with 25, 50, 75, 100 and 150 mg kg−1 hesperidin, respectively. The feeding experiment lasted 8 weeks. The results indicated that compared with the control group, the crayfish groups supplemented with 50–150 mg kg−1 hesperidin had a decreased feed conversion ratio (FCR) and increased final body weight (FBW), specific growth rate (SGR) and weight gain (WG) (P

We study the decays of $Λ_b \to Λ_c(\to B_n f) \ell ^- \overlineν$ with $\ell = e, μ, τ$, where $B_n$ and $f$ are the daughter baryons and the rest of the particles in $Λ_c$ cascade decays, respectively. In particular, we examine the full angular distributions with polarized $Λ_b$ and lepton mass effects, in which the time-reversal asymmetries are identified. We concentrate on the decay modes of $Λ_b \to Λ_c(\to p K^- π^+) \ell ^- \overlineν$ to demonstrate their experimental feasibility. We show that the observables associated with the time-reversal asymmetries are useful to search for new physics as they vanish in the standard model. Explicitly, we find that they are sensitive to the right-handed current from new physics, and possible to be observed at LHCb., 22 pages, 3 figures, accepted by PRD

We study the decays of $Λ_b \to Λ(\to p π^-) \ell ^+ \ell^-$ with $\ell = (e, μ, τ)$. In particular, we examine the full angular distributions with polarized $Λ_b$ and identify the time-reversal asymmetries or T-odd observables. By using the homogeneous bag model, we find that the decay branching fractions of $Λ_b \to Λ\ell^+\ell^-$ are $(9.1\pm 2.5,7.9\pm 1.8, 2.1\pm 0.2)\times 10^{-7}$ for $\ell =(e, μ,τ)$, respectively. In addition, we obtain that $A_{FB}^{\ell} = -0.369\pm 0.007$ and $A_{FB}^{h}=-0.333\pm 0.004$, averaged in the range of $15 \leq q^2 \leq 20~ \text{GeV}^2$. These results are well consistent with the current experimental data. We also explore the T-odd observables in $Λ_b \to Λ(\to p π^-) μ^+ μ^-$, which are sensitive to new physics~(NP). Explicitly, we illustrate that the current experimental measurement from one of the T-odd observables favors the existence of NP, such as the extra $Z$-boson model., 21 pages, 1 figure

We study the heavy quark symmetry with the homogeneous bag model (HBM) and light-front quark model (LFQM) based on the decays of $Λ_b^0\toΛ_c^+\ell^-\overlineν_\ell~(\ell=e,μ,τ)$. In particular, we calculate various parameters in the heavy quark expansions, including the Isgur-Wise functions and their first order corrections. The parameters in the HBM are fitted from the mass spectra, while the ones in the LFQM are tightly constrained by the heavy quark symmetry, granting the predictive power of our results. We explicitly obtain that ${\cal B}(Λ_b^0\toΛ_c^+e^-\overlineν_e)=(5.69\pm 0.58, 5.35\pm 0.50)$, ${\cal B}(Λ_b^0\toΛ_c^+μ^-\overlineν_μ)=(5.67\pm 0.58 $, $5.33\pm 0.49)$, and $Γ(Λ_b^0\toΛ_c^+τ^-\overlineν_τ)/Γ(Λ_b^0\toΛ_c^+μ^-\overlineν_μ)=(0.3243\pm 0.0126$, $ 0.3506\pm 0.0046)$ for the numerical values of (HBM, LFQM). Our results of the branching fractions in both models agree well with the experimental data and lattice QCD calculations. In addition, we find that the hard gluon corrections decrease the branching fractions around $10\%$., 24 pages, 5 figures

We study the $Ξ_c- Ξ_c'$ mixing effects in the semileptonic decays the doubly charm baryons of $Ξ_{cc}$. We focus on the ratio of ${\cal R}(θ_c) \equiv {\cal B}( Ξ_{cc} \to Ξ_c' e^+ ν_e)/ {\cal B}( Ξ_{cc} \to Ξ_c e^+ ν_e) $ and find that $({\cal R}(θ_0),{\cal R}(- θ_0)) =(0.46 \pm 0.01,7.33 \pm 0.23)$ with $θ_0 = 0.137π$, which are in sharp contrast to ${\cal R}(0)=2.15\pm0.11$ without the mixing. The ratio is enhanced~(suppressed) by a factor of four for a negative~(positive) $θ_c$. In addition, the polarization asymmetries of $Ξ_c^{(\prime)}$ are found to be $α(-θ_0) = 0.32 ~(-0.76)$ and $α(θ_0) = -0.82~(-0.38)$. As ${\cal R}$ and $α$ are highly sensitive to $θ_c$ and unaffected by the $W$-exchange contributions, they provide excellent opportunities to determine $θ_c$ in the ongoing experiments., 6 pages, 2 figures

We explain the $W$-boson mass anomaly by introducing an $SU(2)_L$ scalar multiplet with general isospin and hypercharge in the case without its vacuum expectation value. It is shown that the dominant contribution from the scalar multiplet to the $W$-boson mass arises at one-loop level, which can be expressed in terms of the electroweak (EW) oblique parameters $T$ and $S$ at leading order. We firstly rederive the general formulae of $T$ and $S$ induced by a scalar multiplet of EW charges, confirming the results in the literature. We then study several specific examples of great phenomenological interest by applying these general expressions. As a result, it is found that the model with a scalar multiplet in an $SU(2)_L$ real representation with $Y=0$ cannot generate the required $M_W$ correction since it leads to vanishing values of $T$ and $S$. On the other hand, the cases with scalars in a complex representation under $SU(2)_L$ with a general hypercharge can explain the $M_W$ excess observed by CDF-\uppercase\expandafter{\romannumeral2} due to nonzero $T$ and $S$. We further take into account of the strong constraints from the perturbativity and the EW global fit of the precision data, and vary the isospin representation and hypercharge of the additional scalar multiplet, in order to assess the extent of the model to solve the $W$-boson mass anomaly. It turns out that these constraints play important roles in setting limits on the model parameter space. We also briefly describe the collider signatures of the extra scalar multiplet, especially when it contains long-lived heavy highly charged states., Comment: 36 pages, 13 figures. Minor modifications, references updated

We study the ratio of $R=2 Γ(Ξ_c^0 \to Ξ^- e^+ ν_e )/3Γ(Λ_c^+ \to Λe^+ ν_e )$, which is found to be $R= 1 (0.8)$ from the exact (broken) $SU(3)$ flavor symmetry, in sharp contrast to the average value of $R_{av}=0.59\pm 0.10 $ from the ALICE collaboration and lattice QCD results. We propose to use the mixing of $Ξ_c-Ξ_c'$ to resolve the puzzle. With the model-independent mass relations, we find that the mixing angle is $|θ_c| = 0.137(5)π$, which suppresses $Ξ_c\to Ξe^+ ν_e$ about $20\%$ model-independently, resulting in $R\approx 0.6$ with the $SU(3)$ flavor breaking effect. We explicitly demonstrate that $R= 0.70 \pm 0.09$ from the bag model, which is also consistent with $R_{av}$. To test the mixing mechanism, we recommend the experiments to measure the decays of $Ξ_c \to Ξ'(1530) e^+ ν_e$, whose branching fractions are determined to be $ ( 4.4\sim 8.7)\times 10^{-3}$ and $(1.3\sim 2.6 )\%$ for $Ξ_c^0$ and $Ξ_c^+$, respectively, but vanish without the mixing. In addition, nonvanishing values of ${\cal B}(Ξ_c^+\to Ξ^{\prime 0} (1530)π^+ )$ and ${\cal B}(Ξ_c^+\to Σ^{\prime +} (1530) \overline{K}^0 )$ will also be evidences of the mixing based on the Köner-Pati-Woo theorem, which are calculated as $(3.8\sim 7.5)\times 10^{-3}$ and $(6.6\sim 13)\times 10 ^{-4}$, respectively. We emphasize that $θ_c$ is sizable and should be given serious considerations in future studies on the heavy baryon systems., 16 pages, 4 figures, accepted by PLB

We present a systematic study of $Λ_c^+ \to {\cal B}_q \ell^+ ν_\ell $ with ${\cal B}_q = (Λ, n)$ and $\ell =( e, μ)$, examining all the possible decay observables based on the homogeneous bag model (HBM) and lattice QCD (LQCD). With the HBM, we find that the branching fractions and polarization asymmetries of the daughter baryon $Λ$ are ${\cal B}(Λ_c^+ \to Λe^+ ν_e, Λμ^+ ν_μ, n \ell ^+ ν_\ell ) = (3.78 \pm 0.25, 3.67\pm 0.23, 0.40\pm 0.04 )\%$ and $α_Λ(Λ_c^+ \to Λe^+ ν_e,Λμ^+ ν_μ) =(-82.6,-82.3)\%$, respectively. From the LQCD, we obtain that $α_Λ(Λ_c^+ \to Λe^+ ν_e, μ^+ ν_μ) = (-87.4\pm 1.0,-87.2\pm 1.0)\%$. We also explore the time-reversal asymmetries due to new physics beyond the standard model. All our results are consistent with the current experimental data, while some of them are accessible to the experiments at BESIII and Belle II., 23 pages, 17 figures

Hepatocellular carcinoma (HCC) is notorious for its poor prognosis. Previous studies identified several N6-methyladenosine (m6A)-related genes that play key roles in the initiation and progression of HCC patients. In particular, the N6-methyladenosine RNA methylation regulator ZC3H13 could be a candidate as a novel biomarker and therapeutic target for hepatocellular carcinoma. In HCC, low expression of ZC3H13 was reported, but the molecular reason is unclear. In this study, we performed pan cancer analysis for ZC3H13 expression and prognosis using The Cancer Genome Atlas (TCGA) and Genotype-Tissue Expression (GTEx) data and found that ZC3H13 might be a potential tumor suppressor gene in HCC. Subsequently, miRNAs contributing to ZC3H13 downregulation were identified by a series of

We study the spin correlations to probe time-reversal~(T) asymmetries in the decays of $��_b \to ��V ~(V=��, ��^0, ��, K^{*0})$. The eigenstates of the T-odd operators are obtained along with definite angular momenta. We obtain the T-odd spin correlations from the complex phases among the helicity amplitudes. We give the angular distributions of $��_b \to ��(\to p ��^-)V(\to PP')$ and show the corresponding spin correlations, where $P^{(\prime)}$ are the pseudoscalar mesons. Due to the helicity conservation of the $s$ quark in $��$, we deduce that the polarization asymmetries of $��$ are close to $-1$. Since the decay of $��_b \to ����$ in the standard model~(SM) is dictated by the single weak phase from the product of CKM elements, $V_{tb}V_{ts}^*$, the true T and CP asymmetries are suppressed, providing a clean background to test the SM and search for new physics. In the factorization approach, as the helicity amplitudes in the SM share the same complex phase, T-violating effects are absent. Nonetheless, the experimental branching ratio of $Br(��_b \to ����) = (5.18\pm 1.29 )\times 10^{-6}$ suggests that the nonfactorizable effects or some new physics play an important role. By parametrizing the nonfactorizable contributions with the effective color number, we calculate the branching ratios and direct CP asymmetries. We also explore the possible T-violating effects from new physics., 26 pages, 1 figure, revised version accepted by JHEP

Additional file 2: Figure S1. CP accumulation in the N. benthamiana leaf patches expressing TVBMVCP, TVBMV(Y105A), TVBMV(Y105G), TVBMV(Y147A) or TVBMV(Y147G) at 5 dpai. Ponceau red-stained nitrocellulose membrane-bound RuBisCO large subunit protein (Rubi) was used to show sample loadings. Figure S2. Alignment of 234 full-length CP sequences representing 127 potyviruses. The color scheme of residues shows different hydrophobicity. Blue indicates hydrophilic residues, green indicates neutral residues and black indicates hydrophobic residues. Positions of aromatic residues predicted to form π-stacking in TVBMV CP are indicated by arrowheads. The positions labeled with red and blue arrowheads indicate the completely and incompletely conserved residues for aromatic residues, respectively. Figure S3. Comparison of the predicted 3D model of TVBMV, WMV, PVY and TuMV CPs. Protein Data Bank (PDB) code: 6HXX for PVY CP, 5ODV for WMV CP and 6T34 for TuMV CP. The 3D model of TVBMV CP was predicted using the I-TASSER server. Figure S4. Alignment of TVBMV and WMV CP aromatic residues forming π-stackings.

Additional file 1: Table S1. Centroid distances between rings of aromatic residues in TVBMV CP. Table S2. Centroid distances between rings of aromatic residues in WMV CP. Table S3. Primers used in this study.

Polysaccharides have many functions in aquatic animals and are widely used as immunopotentiators. However, despite the emergence of serious diseases, few studies have explored the effects of Codonopsis pilosula polysaccharide (CPP) on crustaceans. We studied the effects of CPP on the growth performance, nonspecific immunity, antioxidant activity and disease resistance of red swamp crayfish (Procambarus clarkii). Healthy crayfish (5.80 ± 0.1 g) were fed diets supplemented with 0% (control), 0.05%, 0.1%, 0.15%, 0.20%, and 0.30% CPP for 8 weeks. At the end of the 8-week feeding trial, the optimal final body weight (FBW), weight gain (WG), specific growth rate (SGR), and feed conversion ratio (FCR) were observed in the crayfish fed the diets with 0.15% and 0.20% CPP, followed by those fed the diet with 0.30% CPP and then those fed the diet with 0.10% CPP, whereas the values of these parameters were obtained with the control crayfish (P 0.05). The crayfish fed the diets with 0.15% and 0.20% CPP exhibited a significantly higher total hemocyte count (THC) and significantly increased phenoloxidase (PO), lysozyme (LZM), hemocyte (Hc), acid phosphatase (ACP) and alkaline phosphatase (AKP) compared with those belonging to the other groups (P 0.05). The crayfish fed the diets with 0.15% and 0.2% CPP exhibited significantly higher total superoxide dismutase (T-SOD) and glutathione peroxidase (GPx) activities, a significantly increased total antioxidant capacity (T-AOC) and a significantly lower malondialdehyde (MDA) content compared with the other groups (P 0.05), which indicated that antioxidant capacity was significantly induced by the CPP-supplemented diets. Significantly upregulated expression of immune-related genes (anti-lipopolysaccharide factors (alf), peroxiredoxin (prx5), cathepsin B (ctsb), mitochondrial manganese superoxide dismutase (mtMnsod), cyclophilin A (cypa), glutathione peroxidase (gpx), Toll-like receptor 3 (tlr3), and heat shock protein 70 (hsp70)) was detected in the crayfish fed the diets supplemented with 0.15% and 0.20% CPP diet compared with the levels observed in the control crayfish. These results showed that dietary CPP supplementation greatly improved the growth, immunity and antioxidant capacities of crayfish, and according to the observed results, 0.15%-0.2% is the recommended optimal level of CPP dietary supplementation for crayfish.

The latest search for the rare kaon decay $K^+\to��^+��\bar��$ by the NA62 experiment has produced evidence for it with a branching fraction consistent with the prediction of the standard model. The new result implies that in this decay, with the $��\bar��$ pair appearing as missing energy ($\not\!\!E$), the room for possible new physics is no longer sizable and that therefore its contributions to underlying four-particle $s\to d\!\not\!\!E$ operators with parity-even $ds$ quark bilinears have become significantly constrained. Nevertheless, we point out that appreciable manifestations from beyond the standard model induced by the corresponding operators with mainly parity-odd $ds$ quark bilinears could still occur in $K\to����\!\not\!\!E$ modes, on which there are only minimal empirical details at present. We find in particular that new physics of this kind may enhance the branching fraction of $K_L\to��^0��^0\!\not\!\!E$ to values reaching its current experimental upper limit and the branching fractions of $K^+\to��^+��^0\!\not\!\!E$ and $K_L\to��^+��^-\!\not\!\!E$ to the levels of $10^{-7}$ and $10^{-6}$, respectively. Thus, quests for these decays in existing kaon facilities such as KOTO and NA62 or future ones could provide valuable information complementary to that gained from $K\to��\!\not\!\!E$., 15 pages, no figure, kaon mixing constraint included, references added, matches publication

We study the nonleptonic two-body weak decays of $��_b$ by modifying the MIT bag model without introducing new parameters to construct the momentum eigenstates of the baryons. We find that the branching ratios of $��_b^0 \to ��_c^+ ��^-$, $��_c^+ K^-$, $p ��^-$ and $pK^-$ are $(4.5\pm0.2)\times 10^{-3}$, $(3.4\pm 0.1)\times 10^{-4}$, $(5.0\pm 0.5)\times 10^{-6}$ and $(6.0\pm 0.7) \times 10^{-6}$, which are all well consistent with the current experimental data, respectively. We also explore P and CP asymmetries for the decays of $��_b^0 \to p (��^-,K^-)$. In particular, we obtain that the direct CP-violating rate asymmetries in $��_b^0 \to p ��^-$ and $��_b^0 \to p K^-$ are around $-4.4\%$ and $6.7\%$, in comparison with $(-2.5\pm2.9)\%$ and $(-2.5\pm2.2)\%$ from the Particle Data Group in 2020, respectively., 16 pages, no figure, revised version accepted by PRD

Cloud manufacturing is a specific implementation form of the “Internet + manufacturing” strategy. Why and how to develop cloud manufacturing platform (CMP), however, remains the key concern of both platform operators and users. A microscopic model is proposed to investigate advantages and diffusion forces of CMP through exploration of its diffusion process and mechanism. Specifically, a three-stage basic evolution process of CMP is innovatively proposed. Then, based on this basic process, a more complex CMP evolution model has been established in virtue of complex network theory, with five diffusion forces identified. Thereafter, simulations on CMP diffusion have been conducted. The results indicate that, CMP possesses better resource utilization, user satisfaction, and enterprise utility. Results of simulation on impacts of different diffusion forces show that both the time required for CMP to reach an equilibrium state and the final network size are affected simultaneously by the five diffusion forces. All these analyses indicate that CMP could create an open online cooperation environment and turns out to be an effective implementation of the “Internet + manufacturing” strategy.

The single-mode fiber (SMF) adaptive coupling device can efficiently and stably couple the space laser into SMF, which plays an important role in the fiber-based free space optical communication (FSOC) technology. Therefore, a novel corrector named adaptive fiber coupler (AFC) is developed and successfully used in the adaptive SMF coupling applications. However, in the FSOC system under long-range turbulent atmosphere, the closed loop performance of AFC will be seriously disturbed by the photoelectric conversion noise. This problem is studied in depth in this paper. The operational principle of the photoelectric conversion noise is analyzed, and the corresponding evaluation index isgiven. Furthermore, The numerical simulation experiments are conducted to study the specific influence of the photoelectric conversion noise. The results show that the averaged closed-loop coupling efficiency, control accuracy, and control bandwidth of AFC are seriously affected. According to the results, the empirical formula is given. This formula can be used to calculate the optical and electrical parameters that the AFC device should meet under the condition of strong noise interference. The theoretical and simulation results in this paper can provide a theoretical basis for designing the AFC device under long-range turbulent atmosphere.

We analyze the weak processes of anti-triplet charmed baryons decaying to octet baryons and mesons with the SU(3) flavor symmetry and topological quark diagram scheme. We study the decay branching ratios without neglecting the contributions from ${\cal O}(\overline{15})$ for the first time in the SU(3) flavor symmetry approach. The fitting results for the Cabibbo allowed and suppressed decays of $��_{c}^+$ are all consistent with the experimental data. We predict all singly Cabibbo suppressed decays. In particular, we find that ${\cal B}(��_c^+\to p ��^0)=(1.3\pm0.7)\times 10^{-4}$, which is slightly below the current experimental upper limit of $2.7\times 10^{-4}$ and can be tested by the ongoing experiment at BESIII as well as the future one at Belle-II., 11 pages, 2 figure, revised version accepted by PLB

We study the $��(��)$CDM models with $��(��)$ being a function of the time-varying fine structure constant $��$. We give a close look at the constraints on two specific $��(��)$CDM models with one and two model parameters, respectively, based on the cosmological observational measurements along with 313 data points for the time-varying $��$. We find that the model parameters are constrained to be around $10^{-4}$, which are similar to the results discussed previously but more accurately., 16 pages, 4 figures, published in Annals of Physics 397 (2018) 400-409

We propose a model with an $U(1)_{B-L}$ gauge symmetry, in which small neutrino masses, dark matter and the matter-antimatter asymmetry in the Universe can be simultaneously explained. In particular, the neutrino masses are generated radiatively, while the matter-antimatter asymmetry is led by the leptogenesis mechanism, at TeV scale. We also explore allowed regions of the model parameters and discuss some phenomenological effects including lepton flavor violating processes., Comment: 19 pages, 4 tables, 12 figures; accepted version for publication in Physics of the Dark Universe

We examine the running vacuum model with $��(H) = 3 ��H^2 + ��_0$, where $��$ is the model parameter and $��_0$ is the cosmological constant. From the data of the cosmic microwave background radiation, weak lensing and baryon acoustic oscillation along with the time dependent Hubble parameter $H(z)$ and weighted linear growth $f (z)��_8(z)$ measurements, we find that $��=(1.37^{+0.72}_{-0.95})\times 10^{-4}$ with the best fitted $��^2$ value slightly smaller than that in the $��$CDM model., 15 pages, 1 figure, revised version accepted by JCAP

Modal parameters of power transformer winding are closely related to transformer manufacturing and detection technology of winding deformation based on vibration analysis method. Aimed at identifying the modal parameters of transformer winding accurately, a modal experiment is designed and made on a real 10 kV power transformer. An improved Empirical Mode Decomposition (EMD) algorithm is proposed to identify the modal parameters of transformer winding with obtained experiment data. First, Ensemble Empirical Mode Decomposition (EEMD) is applied to decompose the vibration signals roughly. Then a masking signal is introduced to eliminate the mode mixing effect with the selected masking frequency. Finally, EMD is used again to get the final Intrinsic Mode Functions (IMFs). By applying the Hilbert transform to the obtained IMFs, modal parameters of power transformer winding are calculated. The PolyMax method is also used to extract modal parameters of transformer winding as a comparison. Calculated results have shown that natural frequency obtained by two methods matches well and the proposed method shows better accuracy in the identification of damping ratio, which verifies the effectiveness of proposed method to recognize the modal parameters of transformer winding with high accuracy.

Well-dispersible aniline/ p -phenylenediamine copolymer [P(ANI- co-p -PDA)-F] was synthesized by chemical oxidative polymerization in the presence of nonylphenol ethoxylate (TX-8) with the hydrophilic lipophilic balance (HLB) value of 10–11. The FTIR and 1 H NMR spectra proved that there was TX-8 composition in P(ANI- co-p -PDA)-F copolymer. And the P(ANI- co-p -PDA)-F had the smaller particle diameter and better dispersion stability in toluene than that of P(ANI- co-p -PDA) copolymer without TX-8. The anti-corrosion performance of carbon steel samples coated by P(ANI- co-p -PDA)-F/epoxy composite coatings in 5 wt% NaCl and 0.1 M HCl aqueous solution were evaluated by the potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results showed that the P(ANI- co-p -PDA)-F/epoxy coatings on carbon steel possessed good corrosion resistance, and composite coating containing 7 wt% P(ANI- co-p -PDA)-F exhibited best anti-corrosive performance.

Adult neurogenesis in the subventricular zone (SVZ), as well as in the subgranular zone contributes to brain maintenance and regeneration. In the adult brain, dopamine (DA) can regulate the endogenous neural stem cells within these two regions, while a DA deficit may affect neurogenesis. Notably, the factors that regulate in vivo neurogenesis in these subregions have not yet been fully characterized, particularly following DA depletion. In thi study, we performed RNA sequencing to investigate transcriptomic changes in the SVZ and dentate gyrus (DG) of mice in response to 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP). This analysis identified differentially expressed genes which were involved in the regulation of transcription, immune response, extracellular region, cell junction and myelination. These genes partially displayed different temporal profiles of expression, some of which may participate in the metabolic switch related to neurogenesis. Additionally, the mitogen-activated protein kinase (MAPK) signaling pathway was shown to be been positively regulated in the SVZ, while it was negatively affected in the DG following MPTP administration. Overall, our findings indicate that exposure to MPTP may exert different effects on transcriptome profiling between the SVZ and DG.

This paper deals with the optimal energy-efficient control strategy of high speed train by means of the maximum principle with the speed limit constraints. Considering the variation and jump regulations of the co-state variable in two cases (with speed limit and without considering the speed limit), two types of transition diagrams are given respectively. According to the transition diagram, the types of transitions with touching the speed limit are classified into four base cases and other transitions are derived or combined from these four base cases. On this basis, the relationship between optimal operation and flat-out operation is discussed. Optimal operation with speed limit is close to the flat-out operation along with the decreasing of the operation time.

An introduction was given to the active segmented mirror(ASM) used in coherent beam combination firstly. Based on the actuator distribution of ASM, the computational formula between the perturbation voltage of each actuator and the perturbation of piston or tip/tilt was acquired. Then the numerical analysis of correction process with two different perturbation ways in SPGD algorithm was carried on. By comparing the two correction processes, it was found that the convergence speed of the second method is 25 times as fast as the first one when there only existed piston error between the two beamlets, while the convergence speed was almost the same when there only existed tip/tilt error, and the convergence speed is 5 times when there existed both piston and tip/tilt error.

In this paper, the dynamic characteristics of some controllable floating raft test system are studied. The virtual dynamic model of the system is established in Adams, the acceleration responses of system in different damping states are simulated, and the vibration level differences of system in different damping states are contrasted. The results show that it is able to improve the vibration isolation property in wide frequency range by switch on-off control of the controllable damper. Finally the possibility to improve the vibration isolation property of system by semi-active control of variable damper is discussed. Keywords‐floating raft; vibration isolation; semi-active control

We investigate the observational constraints on the modified gravity, which combines the $R^{2-q}$ inflation with the power-law (exponential) type of the viable $f(R)$ dark energy models. We discuss the difference between the combined model and $R^{2-q}$ gravity in the inflationary epoch and obtain the constraints on the deviation power $q$ as well as the parameters in $f(R)$ by using the CosmoMC package. The allowed ranges of the spectral index and tensor-to-scalar ratio from the Planck data are highly restricted, resulting in $q < 2.66 \times 10^{-2}$ and $2.17 \times 10^{-2}$ for the power-law and exponential types of $f(R)$ gravity, respectively., 9 pages, 6 figures, revised version accepted for publication in Astrophysics and Space Science

Poly(o-anisidine)/V2O5 and poly(o-anthranilic acid)/V2O5 nanocomposites were prepared by in situ intercalative polymerization, and the structure and electrical properties of these nanocomposites were investigated using GPC, TGA, XRD, TEM, FTIR, UV-vis as well as conductivity measurement. The results show that the steric effect and nature of the substituting groups in the aromatic ring has an influence on the structure and electrical properties of the nanocomposites. Poly(o-anisidine) or poly(o-anthranilic acid) exists as a monolayer of outstretched chains in the gallery of the V2O5 xerogel owing to the confined environment in the nanometer-size gallery. And intercalation of poly(o-anisidine) or poly(o-anthranilic acid) can improve the conductivity of V2O5 xerogel. Copyright © 2005 Society of Chemical Industry

In order to solve the problem of existing a large estimation error when using the current algorithm which based on the autocorrelation matrix eigenvalue decomposition to estimate the SNR of the short signal frame in the communication system, this paper proposes an improved blind SNR estimation algorithm. Based on the previous algorithm, it introduces an idea of re-constructing the autocorrelation matrix by using the model of discrete multi-channel. Simulation shows that the standard deviations of SNR estimation are less than 0.5dB which are 1.2dB in the previous algorithm when the SNR ranges from 0dB to 20dB. This is very important for practical implications, especially for the satellite communication. For the current satellite channel, if the baud rate of a burst signal is less than 2M, the 60MHz band pass acquisition card which is popular in life is sufficient to meet the requirement.

In this paper, a novel naive Bayesian classifier based on the hybrid-weight feature attributes (short of "NBCHWFA") is proposed. NBCHWFA arranges a hybrid weight for each feature attribute by merging the effectiveness of feature attribute on classification and the dependence between feature attribute and class attribute. In order to demonstrate the feasibility and effectiveness of proposed NBCHWFA, we experimentally compare our method with standard naive Bayesian classifier (NBC), NBC with gain ratio weight (NBCGR), and NBC with correlation coefficient weight (NBCCC) on 10 UCI datasets. And, a statistical analysis is also given. The final results show that NBCHWFA can obtain the statistically best classification accuracy.

While the muon $g-2$ anomaly can be successfully explained by some new physics models, most of them are severely constrained by the $��\to e ��$ bound. This tension is more transparent from the effective field theory perspective, in which the two phenomena are encoded in two very similar operators. However, with the ${\cal O}(1)$ Wilson coefficients, the current upper bound on $��\to e ��$ indicates a new-physics cutoff scale five orders smaller than that needed to eliminate the $(g-2)_��$ anomaly. By summarizing all the formulae from the one-loop contributions to the muon $g-2$ with the internal-particle spin not larger than 1, we point out two general methods to reconcile the conflict between the muon $g-2$ and $��\to e ��$: the GIM mechanism and the non-universal couplings. For the latter method, we use a simple scalar leptoquark model as an illustration., 22 pages, 4 figures, updated version accepted by PRD

In this paper proposed an air bearing based on the mechanism of NFAL can levitate and position objects due to both a vibrating cylindrical stator and two circular plates. A group of piezoelectric ceramics is bonded on the cylindrical stator surface to acquire the standing wave bending vibration and resulting acoustic levitation, which provides radial non-contact support, and the two circular actuators bonded at both ends of the housing can also respectively be piezoelectrically excited standing waves to provide an axial position support. Structural dynamics analysis and simulation is carried out for the stators to select appropriate materials and modals. Finally, a prototype is manufactured, and the modal parameters and the levitation ability of the proposed bearing are measured. By means of simulation and experimental results a non-contact levitation bearings with considerable bearing capacity and a simple system structure can be achieved based on NFAL mechanism.

In this paper, levitation characteristics of a noncontact rotary ultrasonic motor are analyzed by the finite element method, with the COMSOL MULTIPHYSICS software. The motor consists of a bowel-shaped stator and semispherical rotor, and the rotor is levitated by acoustic field in the air gap between the stator and rotor, generated by a traveling wave vibration of the stator. It has no mechanical bearing and provides a full-noncontact rotary drive. After verifying the effectiveness of the calculation method by experimental results, dependence of the levitation force and stiffness on design parameters are theoretically investigated. The design parameters include the radius of the stator's radiation surface, shape of the rotor. The acoustic radiation pressure on the rotor's surface is uneven. The levitation force and stiffness are very sensitive to the radius of the stator's radiation surface and the rotor's shape.

In this paper, a variable momentum factor algorithm is presented for improving the performance of the momentum term based nonlinear principle component analysis (PCA). Firstly, a smoothed error function is defined to describe the estimation error between the estimated separating matrix and its optimal value. Then, using a nonlinear function, the variable momentum factor is obtained according to the smoothed error function. Computer simulation results of adaptive blind source separation demonstrate that the proposed approach leads to faster convergence rate and lower misadjustment error than the momentum nonlinear PCA just with small increase in computational complexity.