Poly[aqua­[μ2-cis-1,2-bis­(4-pyrid­yl)ethyl­ene-κ2 N:N′](μ2-5-nitro­isophthalato-κ3 O:O′,O′′)nickel(II)]

In the title compound, [Ni(C8H3NO6)(C12H10N2)(H2O)]n, the NiII atom is octa­hedrally coordinated by two cis N atoms from two different 1,2-bis­(4-pyrid­yl)ethyl­ene (bpe) ligands, two O atoms from one chelating carboxyl group of the 5-nitro­isophthalic acid (nip) ligand, one O atom from another monodentate nip ligand and one O atom from a water mol­ecule, forming a three-dimensional network structure. Inter­molecular O—H⋯O hydrogen bonding stabilizes this arrangement. The asymmetric unit of the structure contains one NiII atom, one water mol­ecule, one nip ligand and two half-mol­ecules of the bpe ligand with an inversion centre at the mid-point of the central C=C bond

Heavy quark dominance in orbital excitation of singly and doubly heavy baryons

A mechanism of the heavy quark dominance in the orbital excitation is proposed in this paper which is testified to be reasonable for singly and doubly heavy baryons. In the relativistic quark model, an analysis of the Hamiltonian figures out the mechanism that the excitation mode with lower energy levels is always associated with the heavy quark(s), and the splitting of the energy levels is suppressed by the heavy quark(s). So, the heavy quarks dominate the orbital excitation of singly and doubly heavy baryons. Furthermore, a physical understanding of this mechanism is given in a semi-classical way. Accordingly, the predicted mass spectra of singly and doubly heavy baryons confirm the rationality of this mechanism. In addition, an interesting consequence of this mechanism is that a heavy-light meson is more likely to be produced in the strong decay of the high-orbital excited states, which is supported by experiments. This mechanism is rooted in the breakdown of the mass symmetry. Therefore, it may be also valid for other multi-quark systems, such as the tetraquarks Qqqq and QQqq, or the pentaquarks Qqqqq and QQqqq.Comment: 12 pages, 7 figures, 5 table

Energy Efficiency Evaluation of Power Equipment Based on DEA

As the current situation of imperfect model algorithm of electrical equipment for energy efficiency evaluation, we set up energy efficiency DEA model. In the model, we got average load rate, average power factor and tri-phase unbalance factor as inputs indexes. And we got economic output of per unit of power consumption and energy pollution as outputs indexes. Then we transformed multiple pollutants into a pollutant index through principal component analysis. And we got it as the desired output. The result of 12 industrial enterprises in the energy efficiency of electrical equipment shows that the evaluation model is suitable for energy efficiency evaluation and system analysis. The DEA model is useful to further improvement in the energy efficiency of equipment

Systematic analysis of strange single heavy baryons Ξc\Xi_{c} and Ξb\Xi_{b}

Motivated by the experimental progress in the study of heavy baryons, we investigate the mass spectra of strange single heavy baryons in the $\lambda$-mode, where the relativistic quark model and the infinitesimally shifted Gaussian basis function method are employed. It is shown that the experimental data can be well reproduced by the predicted masses. The root mean square radii and radial probability density distributions of the wave functions are analyzed in detail. Meanwhile, the mass spectra allow us to successfully construct the Regge trajectories in the $(J,M^{2})$ plane. We also preliminarily assign quantum numbers to the recently observed baryons, including $\Xi_{c}(3055)$, $\Xi_{c}(3080)$, $\Xi_{c}(2930)$, $\Xi_{c}(2923)$, $\Xi_{c}(2939)$, $\Xi_{c}(2965)$, $\Xi_{c}(2970)$, $\Xi_{c}(3123)$, $\Xi_{b}(6100)$, $\Xi_{b}(6227)$, $\Xi_{b}(6327)$ and $\Xi_{b}(6333)$. At last, the spectral structure of the strange single heavy baryons is shown. Accordingly, we predict several new baryons that might be observed in forthcoming experiments.Comment: 27 pages, 11 figures, 8 table

Mass spectra of bottom-charm baryons

In this paper, we investigate the mass spectra of bottom-charm baryons systematically, where the relativistic quark model and the infinitesimally shifted Gaussian basis function method are employed. Our calculation shows that the $\rho$-mode appears lower in energy than the other excited modes. According to this feature, the allowed quantum states are selected and a systematic study of the mass spectra for $\Xi_{bc}^{'}$ ($\Xi_{bc}$) and $\Omega_{bc}^{'}$ ($\Omega_{bc}$) families is performed. The root mean square radii and quark radial probability density distributions of these baryons are analyzed as well. Next, the Regge trajectories in the $(J,M^{2})$ plane are successfully constructed based on the mass spectra. At last, we present the structures of the mass spectra, and analyze the difficulty and opportunity in searching for the ground states of bottom-charm baryons in experiment.Comment: 19 pages, 9 figures, 6 tables. arXiv admin note: text overlap with arXiv:2210.1308

Mass spectra of double-bottom baryons

Based on the relativistic quark model and the infinitesimally shifted Gaussian basis function method, we investigate the mass spectra of double bottom baryons systematically. In the $\rho$-mode which appears lower in energy than the other excited modes, we obtain the allowed quantum states and perform a systematic study of the mass spectra of the $\Xi_{bb}$ and $\Omega_{bb}$ families. We analyze the root mean square radii and quark radial probability density distributions to deeply understand the structure of the heavy baryons. Meanwhile, the mass spectra allow us to successfully construct the Regge trajectories in the $(J,M^{2})$ plane. We also predict the masses of the ground states of double bottom baryons and discuss the differences between the structures of our spectra and those from other theoretical methods. At last, the shell structure of the double bottom baryon spectra is shown, from which one could get a bird's-eye view of the mass spectra.Comment: 16 pages, 9 figures, 5 tables. arXiv admin note: text overlap with arXiv:2207.0416

Effect of three kinds of anaesthetic drugs on postoperative recovery, regulatory T cells and T lymphoid cells in elderly patients

Purpose: To investigate the effect of three anaesthetic drugs on postoperative recovery, regulatory T cells and T cell subset levels in elderly patients.Methods: The patients were randomly divided into groups A, B and C (42 patients per group). Group A received intravenous remifentanil, dexamethasone, dexmedetomidine and propofol, followed by continuous intraoperative inhalation of sevoflurane and continuous intravenous pumping of remifentanil. Group B was given intravenous propofol and midazolam, followed by continuous intraoperative inhalation of sevoflurane, while Group C received intravenous etomidate and rocuronium, with continuous intraoperative inhalation of sevoflurane. The preoperative or 24-h postoperative T regulatory cells (CD4+ CD25+) and T cell subsets (CD4+ and CD8+) were determined for each group.Results: MMSE scores in the three groups were lower than their pre-operation scores (p < 0.05). There were significant reductions in 24-h postoperative serum CD4+ CD25+ and CD4+ levels, with higher reductions in group B (p < 0.05). In contrast, CD8+ increased in all groups, but was lower in group B than in the other two groups (p < 0.05).Conclusion: These findings strongly suggest that propofol, midazolam and sevoflurane have rapid onset of action and recovery, which improves the comfort of patients while decreasing negative impact on the function of the immune system. Furthermore, these anaesthetic agents enhance the recovery of elderly patients.Keywords: Anaesthesia, Cognitive function, Regulatory T cells, T cell subset