[en] Intermittent characteristics of turbulence induced by coherent structures (Blob) are manifested clearly on the Langmuir probe signal of HT-7 tokamak. With conditional analysis, asymmetric characteristics of the intermittent bursts are demonstrated. The parameter of plasma inside the Blob is larger than the background plasma parameter. Due to the radial propagation of the coherent structures, the particle density and temperature profiles in the scrape-off layer (SOL) are non-exponential and flat away from the last closed flux surface (LCFS). Around the LCFS, large burst fluctuations are responsible for about 50% of the total transport. These experimental finds may imply that the coherent structures are distorted by the developed shear flow in the shear layer. In SOL region, the coherent structures propagate in the direction of ion diamagnetic drift. (authors)

[en] Objective: To review and summarize the effects of interventional treatment of hand arteriovenous malformation in 5 cases. Methods: Through catheterization of brachial artery ipsilaterally the blood-supply artery of arteriovenous malformation was embolized, using high-temperature managed gelatin sponge, silk thread, pingyangmycine and spring coil. Results: Total 13 blood-supply arteries in 5 cases were embolized with successful rate of 100%, including 1 case of complex malformation under effectively controlled, 3 cases cured clinically and 1 case still awaiting observation. Conclusions: Transcatheter arterial embolization for the treatment of hand arteriovenous malformation is safe, effective and high successful . (authors)

[en] A new programmable prediction method is developed to refine the occultation band by taking into consideration the triaxiality of an occulting body, as well as two more factors, namely, the barycenter offset of an occulting planet from the relevant planetary satellite system and the gravitational deflection of light rays due to an occulting planet. Although these factors can be neglected in most cases, it is shown that there are cases when these factors can cause a variation ranging from several tens to thousands of kilometers in the boundaries of occultation bands. Knowledge of analytic geometry simplifies the process of derivation and computation. This method is applied to long-term predictions of Jovian and Saturnian events. (paper)

[en] In this study, laponite was tested as a mud-making material for drilling fluids. Laponite is a synthetic smectite clay with a structure and composition closely resembling the natural clay mineral hectorite. Commercially available laponite was characterized by X-ray diffractometry, scanning electron microscopy and infrared spectrometry. Its dispersibility, salt resistance and high-temperature resistance were evaluated. The results showed that laponite possessed superior cation exchange capacity (140.4 mmol/100 g) with interlayer cations of Na⁺ and Li⁺. Laponite could easily be dispersed in water to yield increased viscosity with no influence from hydration time or temperature. On the other hand, laponite dispersions displayed an excellent heat resistance, with invariant apparent viscosity at high temperatures. For instance, the apparent viscosity of the 2 wt% laponite dispersion underwent changes between 22 and 24 mPa s after hot rolling at 180–240 °C for 16 h. Compared to existing mud-making materials, laponite exhibited better mud-making properties. Furthermore, laponite revealed good compatibility with other additives, and the water-based drilling fluids prepared with laponite as mud-making material showed an excellent stability at elevated temperatures and superior performance–cost ratios. Overall, these findings indicated that laponite had an excellent dispersibility at high temperatures and hence would have promising applications as high-temperature mud-making material for preparing water-based drilling fluids designed for ultra-high-temperature environments.

[en] HD 6840 is a double-lined visual binary with an orbital period of ∼7.5 years. By fitting the speckle interferometric measurements made by the 6 m BTA telescope and 3.5 m WIYN telescope, Balega et al. gave a preliminary astrometric orbital solution of the system in 2006. Recently, Griffin derived a precise spectroscopic orbital solution from radial velocities observed with OPH and Cambridge Coravel. However, due to the low precision of the determined orbital inclination, the derived component masses are not satisfying. By adding the newly collected astrometric data in the Fourth Catalog of Interferometric Measurements of Binary Stars, we give a three-dimensional orbit solution with high precision and derive the preliminary physical parameters of HD 6840 via a simultaneous fit including both astrometric and radial velocity measurements. (paper)

[en] Embedded clusters are ideal laboratories for understanding the early phase of the dynamical evolution of clusters as well as massive star formation. An interesting observational phenomenon is that some of the embedded clusters show mass segregation, i.e., the most massive stars are preferentially found near the cluster center. We develop a new approach to describe mass segregation. Using this approach and the Two Micron All Sky Survey Point Source Catalog (2MASS PSC), we analyze 18 embedded clusters in the Galaxy. We find that 11 of them are mass-segregated and that the others are not mass-segregated. No inversely mass-segregated cluster is found. (research papers)

[en] Highlights: • ADN@AmGO composites are fabricated by a facile Pickering emulsion templating approach. • AmGO reveals enhancements in terms of the water adsorption resistance as well as the thermal decomposition of ADN. • The enhanced performances are due to the impermeable and hydrophobic natures, and the exceptional conductivity of AmGO. • ADN@AmGO composites represent promising alternatives in the fabrication of high energetic, low signature and eco-friendly propellants. Ammonium dinitramide (ADN) has received great attention as a green oxidizer used in propellants, but its high hygroscopic nature makes it very challenging for practical applications. Herein, we report a facile method to encapsulate ADN by using Pickering emulsion as a soft template, and alkylated graphene oxide nanosheets (AmGO) as particle surfactant. We demonstrate that the encapsulation of ADN aqueous droplets by AmGO nanosheets (ADN@AmGO) can be successfully achieved in a water-in-toluene emulsion, and we studied the influence of factors such as AmGO concentration, and toluene/water ratio on the morphologies of Pickering emulsion. The ADN@AmGO composites were obtained through vacuum assisted solvents extraction, and the compositional and morphological characterizations were performed by using optical microscopy, scanning electron microscopy (SEM), Fourier transform infrared spectra (FTIR), Raman spectra, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Furthermore, the thermal behaviors were examined by differential scanning calorimetry (DSC) and thermogravimetry (TG) analysis. We found that ADN encapsulated by 1.0 wt% of AmGO shows more than 60% decrease in water adsorption. Besides, AmGO reveals pronounced catalytic efficiency on the thermal decomposition of ADN. These outstanding properties make ADN@AmGO promising alternative to be used in the fabrication of high energetic, low signature and eco-friendly propellants.

[en] A new coordination polymer (CP), namely, [Cd(HL)(4,4′‐bipy)] (1) (H${}_3$L = 4‐(5‐carboxy‐pyridine‐3‐yloxy)‐phthalic acid, 4,4′‐bipy = 4,4′‐bipyridine), was synthesized employing a V‐shaped asymmetric tricarboxylic acid ligand under hydrothermal condition. Single‐crystal X‐ray diffraction analysis indicates that compound 1 exhibits a novel three‐dimensional (3D) framework with (3, 5)‐connected (6${}^3$)(6${}^9$·8) topology. Meanwhile, it shows high selectivity and sensitivity for oxoanion pollutants CrO${}_4$${}^{2-<!--\; ???\; -->}$, Cr${}_2$O${}_7$${}^{2-<!--\; ???\; -->}$, and MnO${}_4$${}^{-<!--\; ???\; -->}$ anions in aqueous solutions with detection limits of 4.12 × 10${}^{-<!--\; ???\; -->6}$ M, 1.75 × 10${}^{-<!--\; ???\; -->6}$ M, and 6.47 × 10${}^{-<!--\; ???\; -->7}$ M, respectively. The high selectivity and low detection limit indicate that the compound is promising functional luminescence probe for CrO${}_4$${}^{2-<!--\; ???\; -->}$, Cr${}_2$O${}_7$${}^{2-<!--\; ???\; -->}$, and MnO${}_4$${}^{-<!--\; ???\; -->}$. The mechanisms of the quenching effect and sensing properties were discussed in detail. (© 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

[en] Protein tagging with a wide variety of epitopes and/or fusion partners is used routinely to dissect protein function molecularly. Frequently, the required DNA subcloning is inefficient, especially in cases where multiple constructs are desired for a given protein with unique tags. Additionally, the generated clones have unwanted junction sequences introduced. To add versatile tags into the extracellular domain of the transmembrane protein THSD1, we developed a protein tagging technique that utilizes non-classical type IIS restriction enzymes that recognize non-palindromic DNA sequences and cleave outside of their recognition sites. Our results demonstrate that this method is highly efficient and can precisely fuse any tag into any position of a protein in a scarless manner. Moreover, this method is cost-efficient and adaptable because it uses commercially available type IIS restriction enzymes and is compatible with the traditional cloning system used by many labs. Therefore, precision tagging technology will benefit a number of researchers by providing an alternate method to integrate an array of tags into protein expression constructs.

[en] Objective: To study the dynamic change of endothelin (ET) in the blood, the pathological change, and the ET-IR (ET-immunoreaction, ET-IR) in the development of stenosis after balloon injury of rabbit aorta, and to investigate the effect of captopril on the prevention of restenosis after transluminal angioplasty. Methods: According to the different time of being killed after micro-balloon angioplasty, 48 rabbits were divided randomly into 6 groups such as 6-hour group, 1-day group, 3-day group, 7-day group, 15-day group, and 22-day group. 6 out of 8 rabbits of each group were created models of aortic endothelium injury by micro-balloon angioplasty, and 3 of them were given captopril (2 mg·kg^-1·d^-1 p. o.) from 1 day before balloon injury to the day being killed. The rest 2 rabbits in each group were controls. ET level in the plasma was measured by ELISA before, as well as after micro-balloon angioplasty, and pathomorphological examination of local aorta was carried out to observe the intimal thickness and the extent of lumen stenosis, and ET-IR was assessed by immunohistochemical technique in the aortic wall. Results: (1) The major change of vascular stenosis was the proliferation of vascular smooth muscle cell (VSMC) and endothelium. (2) ET levels in the plasma and ET-IR in the local aortic wall were significantly increased after micro-balloon angioplasty. (3) The intimal thickness and extent of lumen stenosis in the group of medical treatment by captopril were significantly lower than those in injury group. Conclusions: The experimental results show that the major pathologic change of vascular stenosis is the significant proliferation of VSMC and endothelium. Further more, ET is a key factor in the development of vascular stenosis, and captopril can prevent restenosis after angioplasty. (author)