[en] Ktenasite was synthesized by the simple method of mixing ZnO powder with CuSO₄ solution at room temperature. The X-ray diffraction pattern of synthesized ktenasite was very similar to that of mineral ktenasite. The lattice parameters were determined as a=0.559, b=0.616, c=2.374 nm and β=95.63 deg., which agreed comparatively well with those for mineral ktenasite. The synthesized ktenasite consisted of thin rectangular particles ranging in size from 2 to 4 μm in length. TEM observation suggested the formation of a super lattice structure in the a-axis direction and significant crystal growth in the b-axis direction. The intercalation reaction of sodium dodecyl sulfate (NaDS) with ktenasite showed that the intercalation took place accompanied by the expansion of basal spacing from 1.17 to 2.70 nm. The reaction progressed by the SO₄^2-/DS^- anion exchange mechanism with the dissolution of interlayer [Zn(H₂O)₆]SO₄ salt

[en] A black hole on a three-brane in five-dimensional spacetime was predicted by Dadhich, Maartens, Papadopoulos and Rezania (DMPR). In order to reveal some signatures for observations, we investigate a timelike particle’s motion around the DMPR brane-world black holes. We find that, both in the innermost stable circular orbits (ISCO) and the marginally bound orbits (MBO), the particle’s angular momentum and its radius decrease with the increase of Q, where Q is a tidal charge parameter and may be negative and positive in the brane-world black holes. From these results, the corresponding periodic orbits with different energy levels are analyzed numerically by employing a taxonomy, which is related to the adiabatic inspiral regime in the gravitational wave radiation. It clearly shows that a rational number defined by the taxonomy increases with the particle’s energy. In addition, periodic orbits with Q<0 in the DMPR brane-world black holes have higher energy in comparison to the ones with Q>0 and in the Schwarzschild black holes. Our results might provide hints for distinguishing the DMPR brane-world black holes from other black holes by the timelike particle’s periodic orbits in the future.

[en] The electron paramagnetic resonance (EPR) parameters (g factors g_xx, g_yy, g_zz and hyperfine structure constants A_xx, A_yy, A_zz) of the two Cu²⁺ centers in disodium malonate trihydrate (DSMT) single crystal are theoretically interpreted using the high order perturbation formulas of these parameters for a 3d⁹ ions in rhombically elongated octahedra. In the calculation, the rhombic crystal-field parameters are determined from the superposition model and the admixture of d-orbitals in the ground state wave function are taking account, the results show that although the admixture of the |d_z²〉 state to the ground state wave function is small, it should not be neglected in calculations of the EPR parameters. The theoretical EPR parameters show good agreement with the observed values. The results are discussed

[en] We investigate the robustness of entanglement for a qubit-qudit system under depolarizing and dephasing channels. For depolarizing channel, we obtain a simple analytical expression of entanglement evolution. It is shown that the larger dimension d a qudit subsystem has, the more robust a pure state becomes. For dephasing channel, we find the most robust entangled states and the most fragile ones. Moreover, the robustness of these states is independent of the qudit’s dimension d. Graphical abstract:

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[en] A modified generalized Chaplygin gas (MGCG) is considered as the unified dark matter-dark energy revisited. The character of MGCG is endued with the dual role, which behaves as matter at early times and as a quiescence dark energy at late times. The equation of state for MGCG is p = -αρ/(1 + α) - υ(z)ρ^-α/(1 + α), where υ(z) = -[ρ0_c(1 + z)³] ^(1+α) (1 - Ω_0B)^α {αΩ0_DM + Ω_0DE [ω_DE + α(1 +ω_DE)](1 + z)^3ωDE(1+α)}. Some cosmological quantities, such as the densities of different components of the universe Ω_i (i, respectively, denotes baryons, dark matter, and dark energy) and the deceleration parameter q, are obtained. The present deceleration parameter q₀, the transition redshift z_T, and the redshift z_eq, which describes the epoch when the densities in dark matter and dark energy are equal, are also calculated. To distinguish MGCG from others, we then apply the Statefinder diagnostic. Later on, the parameters (α and ω_DE) of MGCG are constrained by combination of the sound speed c²_s , the age of the universe t₀, the growth factor m, and the bias parameter b. It yields α = -3.07^+5.66_-4.98 x 10^-2 and ω_DE = -1.05 ^+0.06_-0.11. Through the analysis of the growth of density perturbations for MGCG, it is found that the energy will transfer from dark matter to dark energy which reach equal at z_e∼ 0.48 and the density fluctuations start deviating from the linear behavior at z ∼ 0.25 caused by the dominance of dark energy. (author)

[en] To establish a cost-effective and easily available phantom for training residents in ultrasound-guided fine needle thyroid nodule targeting punctures. Tofu, drinking straws filled with coupling gel, a urine tube, and 21-gauge needles were used to generate a phantom thyroid with nodules for training. Twelve radiology residents were involved in the study. The puncture success rates were recorded and compared before and after phantom training using the Wilcoxon signed-rank test. On ultrasonography, tofu mimicked the texture of the thyroid. Drinking straws filled with coupling gel mimicked vessels. The urine tube filled with air mimicked the trachea, and 21-gauge needles mimicked small nodules in the transverse section. The entire phantom was similar to the structure of the thyroid and surrounding tissues. The puncture success rates of radiology residents were significantly increased from 34.4 ± 14.2% to 66.7 ± 19.5% after training (p = 0.003). The phantom was constructed in approximately 10 minutes and materials cost less than CNY 10 (approximately $ 1.5) at a local store. The tofu model was cost-effective, easily attainable, and effective for training residents in ultrasound-guided fine needle thyroid nodule targeting punctures in vitro

[en] Objective: To explore the diagnostic value of determination of serum CK-MB content in patients failed to attain reperfusion after AMI. Methods: Serum CK-MB mass (with CLIA), CK-MB content and CK activity (with immunosuppression assay) were measured at admission, every 4-6h for 24h and later every 6-8h until the results fell back to normal again in 70 patients with AMI treated with conventional methods. These markers were measured at admission, every 2-4h for 24h after thrombolytic therapy, every 4-6h for the next 24h, there after every 12h until the results were normal again in another 48 patients with AMI undergoing thrombolytic therapy. Coronary angiography was performed in all patients and in 71 patients proven to be revasculization failures, the data of dynamic changes of these markers were analyzed in detail for study. Results: In the 71 patients, the CK-MB content began to rise as early as at 3.2h, got to peak at 22.2h and persisted for 13.3h, and took further 71.2h to fall to normal again. Corresponding events for CK- MB activity, CK activity occurred: 2.2h and 4.2h later, 3.2h and 10.2h later, 7.8h and 11.2h longer and 7.7h and 37.1h more (differences were significant, P<0.05). Conclusion: CLIA for CK-MB mass is easy to perform and accurate and quite ideal for early diagnosis of AMI. (authors)

[en] Significant thermal voltage signals from spin Seebeck effect and conventional anomalous Nernst and anomalous Righi-Leduc effects have been recognized in the yttrium iron garnet Y₃Fe₅O₁₂ (YIG)/Cu/NiFe/IrMn hybrid spin valves under a perpendicular temperature gradient. The spin transport characteristic parameters of the soft NiFe film can be quantitatively evaluated, including the spin diffusion length and spin Hall angle. The present results show the significance of the YIG hybrid spin valve structure in exploring various spin dependent phenomena. (author)

[en] The effects of a quadratic gravity on astronomical observations and solar system experiments were recently considered in previous works. Its deviation from Einstein’s general relativity is characterized by a model parameter α and the cosmological constant Λ whose constraints were respectively found as m² and m⁻² in the solar system. In this paper, a new test of the gravity by measuring the gravitational time advancement is presented and studied. The gravitational time advancement arises in a two-way light propagation between an observer and a distant spacecraft, where the light traveling time is recorded by the observer’s proper time. It is found that (1) relying on their signs, α and Λ can make the gravitational time advancement smaller or larger than the one of general relativity; (2) the configuration of the inferior conjunction between the observer and the spacecraft is more suitable for detecting the advancement, because its effect is almost 3.5 times larger than the one in the superior conjunction; (3) the time advancement could be effectively complementary to Shapiro time delay for gravitational experiments in practice; and (4) the implement of planetary laser ranging and optical clocks in the future will provide much more insight into the gravity. (paper)

[en] Low-cost synthesis of high-quality ZnS films on silicon wafers is of much importance to the ZnSbased heterojunction blue light-emitting device integrated with silicon. Thus, a series of ZnS films were chemically synthesized at low cost on Si(100) wafers at 353 K under a mixed acidic solution with a pH of 4 with zinc acetate and thioacetamide as precursors and with ethylenediamine and hydrochloric acid as the complexing agent and the pH value modifier, respectively. The effects of the ethylenediamine concentration on the crystallization, surface morphology, and optical properties of the ZnS films were investigated by using X-ray diffractometry, scanning electron microscopy, spectrophotometry, and fluorescence spectroscopy. A mechanism for the formation of ZnS film under an acidic condition was also proposed. All of the ZnS films were polycrystalline in nature, with a dominant cubic phase and a small amounts of hexagonal phases. The crystallization and the surface pattern of the films were clearly improved with increasing ethylenediamine concentration due to its enhanced complexing role. The absorption edge of the films almost underwent a blue shift with increasing ethylenediamine concentration, which was largely attributed to the quantum confinement effects caused by the small particle size of the polycrystalline ZnS films. Defect species and the corresponding strengths of the ZnS films were strongly affected by the ethylenediamine concentration.