Chronology and origin of VMS deposits in Xinjiang,NW China

VMS deposits in Xinjiang, NW China are widespread in the Altay, Tianshan and West Kunlun orogenic belt, mainly formed during the Proterozoic rifting and Phanerozoic post-orogenic extension and are related to the bimodal volcanism. The VMS deposits are middle and small in scale. According to assemblages of metallogenetic elements, they can be divided into four types (Cu-Zn, Cu-S, Pb-Zn-Cu and Pb-Zn types) with the Cu-Zn and Pb-Zn types being the most important ones. Research of isotopic chronology shows that the VMS deposits in Xinjiang were formed during the Proterozoic, Ordovician, Deovonian, Carboniferous and Permian periods and usually underwent multi-stage mineralization, especially the large-sized deposits usually have post-volcanic superimposed mineralization by tectonomagmatic or metamorphic hydrothermal metal-logenic fluids.     

Efficient and stable wireless power transfer based on the non-Hermitian physics

As one of the most attractive non-radiative power transfer mechanisms without cables,efficient magnetic resonance wireless power transfer(WPT)in the near field has been extensively developed in recent years,and promoted a variety of practical applications,such as mobile phones,medical implant devices and electric vehicles.However,the physical mechanism behind some key limitations of the resonance WPT,such as frequency splitting and size-dependent efficiency,is not very clear under the widely used circuit model.Here,we review the recently developed efficient and stable resonance WPT based on non-Hermitian physics,which starts from a completely different avenue(utilizing loss and gain)to introduce novel functionalities to the resonance WPT.From the perspective of non-Hermitian photonics,the coherent and incoherent effects compete and coexist in the WPT system,and the weak stable of energy transfer mainly comes from the broken phase associated with the phase transition of parity-time symmetry.Based on this basic physical framework,some optimization schemes are proposed,including using nonlinear effect,using bound states in the continuum,or resorting to the system with high-order parity-time symmetry.Moreover,the combination of non-Hermitian physics and topological photonics in multi-coil system also provides a versatile platform for long-range robust WPT with topological protection.Therefore,the non-Hermitian physics can not only exactly predict the main results of current WPT systems,but also provide new ways to solve the difficulties of previous designs.     

Formation and stability of paraffin oil-in-water nano-emulsions prepared by the emulsion inversion point method

Paraffin oil-in-water nano-emulsions stabilized by Tween 80/Span 80 were prepared using the emulsion inversion point method at different emulsification temperatures. Nano-emulsions with droplet size below 200 nm were formed above a critical surfactant-to-oil ratio of 0.20 at 50 degrees C. The main destabilization mechanism of the systems was found to be Ostwald ripening. An interesting phenomenon was that the Ostwald ripening rate declined as the surfactant concentration rose. Furthermore, flocculation was also found to contribute to the instability of the nano-emulsions, especially for those with low surfactant concentrations. Study on the electrophoretic properties of emulsion droplets revealed a negative value of the zeta potential, which was strongly dependent on the pH of the systems.     

基于应变的长输管道变形计算方法研究

论文提出了基于应变分析的管道变形计算方法.将管道看作梁,考虑轴线伸长的情况,根据梁大变形问题的几何方程建立应变与位移的关系,利用同一截面的不同位置及同一母线上不同位置的应变值,采用数值计算的方法通过应变与位移的关系式求解得到梁的变形量.     

Ultrafine α-Fe<Subscript>2</Subscript>O<Subscript>3</Subscript> nanoparticles grown in confinement of in situ self-formed “cage” and their superior adsorption performance on arsenic(III)

Without the addition of surfactants or templates, ultrafine α-Fe₂O₃ nanoparticles were successfully synthesized by a solvent thermal process at low temperature. During the synthesis, in situ self-formed “cage” of crystallized NaCl confined the growth of α-Fe₂O₃ nanoparticles in both the precipitation and solvent thermal processes, resulting in the creation of well-crystallized α-Fe₂O₃ nanoparticles with an average particle size about 4–5 nm and a high-specific surface area of ~162 m²/g. High resolution TEM investigations provided clear evidences of the in situ self-formation of NaCl “cage” during the synthesis and its confinement effect on the growth of α-Fe₂O₃ nanoparticles. The superior performance of these α-Fe₂O₃ nanoparticles on the adsorption of arsenite(III) (As) from aqueous environment was demonstrated with both lab-prepared and natural water samples at near neutral pH environment when compared with previously reported removal effects of As(III) by Fe₂O₃. This unique approach may also be utilized in the synthesis of other ultrafine metal oxide nanoparticles for a broad range of technical applications.     

Co-catalyst-free large ZnO single crystal for high-efficiency piezocatalytic hydrogen evolution from pure water

Piezocatalytic materials have been widely used for catalytic hydrogen evolution and purification of organic contaminants.However,most studies focus on nano-size and/or polycrystalline catalysts,suffering from aggregation and neutralization of internal piezoelectric field caused by polydomains.Here we report a single crystal ZnO of large size and few bulk defects crafted by a hydrothermal method for piezocatalytic hydrogen generation from pure water.It is noteworthy that single-side surface areas of both original as-prepared ZnO and Ga-doped ZnO bulk crystals are larger than 30 cm².The high quality of ZnO and Ga-doped ZnO bulks are further uncovered by high-resolution transmission electron microscope(HRTEM),photoluminescence(PL)and X-ray diffraction(XRD).Remarkably,an outstanding hydrogen production rate of co-catalyst-free Ga-doped ZnO bulk crystal(i.e.,a maximum rate of 5915μmol h^-1 m^-2)is observed in pure water triggered by ultrasound in dark,which is over 100 times higher than that of its powder counterpart(i.e.,52.54μmol h^-1 m^-2).The piezocatalytic performance of ZnO bulk crystal is systematically studied in terms of varied exposed crystal facet,thickness and conductivity.Different piezocatalytic performances are attributed to magnitude and distribution of piezoelectric potential,revealed by the finite element method(FEM)simulation.The density functional theory(DFT)calculations are employed to investigate the piezocatalytic hydrogen evolution process,indicating a strong H₂O adsorption and a low energy barrier for both H₂O dissociation and H2 generation on the stressed Znterminated(0001)ZnO surface.     

Effects of N and B on continuous cooling transformation diagrams of Mo–V–Ti micro-alloyed steels

Effects of the single addition of nitrogen (N) and boron (B) and the combined addition of N and B on continuous cooling transformation (CCT) diagrams and properties of the three Mo–V–Ti micro-alloyed steels were investigated by means of a combined method of dilatometry and metallography. Microstructures observed in continuous cooled specimens were composed of pearlite (P), quasi-polygonal ferrite (QPF), granular bainite (GB), acicular ferrite (AF), lath-like bainite (LB) and martensite (M) depending on the cooling rates and transformation temperatures. Single addition of 12?ppm B effectively reduced the formation of QPF and broadened the cooling rate region for LB and M. Added N makes the action of B invalid and the QPF region was prominently broadened, and even though the cooling rate is higher than 50°C?s^?1, it cannot obtain full bainite.     

Chronology and origin of VMS deposits in Xinjiang,NW China

VMS deposits in Xinjiang, NW China are widespread in the Altay, Tianshan and West Kunlun orogenic belt, mainly formed during the Proterozoic rifting and Phanerozoic post-orogenic extension and are related to the bimodal volcanism. The VMS deposits are middle and small in scale. According to assemblages of metallogenetic elements, they can be divided into four types (Cu-Zn, Cu-S, Pb-Zn-Cu and Pb-Zn types) with the Cu-Zn and Pb-Zn types being the most important ones. Research of isotopic chronology shows that the VMS deposits in Xinjiang were formed during the Proterozoic, Ordovician, Deovonian, Carboniferous and Permian periods and usually underwent multi-stage mineralization, especially the large-sized deposits usually have post-volcanic superimposed mineralization by tectonomagmatic or metamorphic hydrothermal metal-logenic fluids.

     

Chronology and origin of VMS deposits in Xinjiang, NW CHINA

VMS deposits in Xinjiang, NW China are widespread in the Altay, Tianshan and WestKunlun orogenic belt, mainly formed during the Proterozoic rifting and Phanerozoic post-orogenicextension and are related to the bimodal volcanism. The VMS deposits are middle and small inscale. According to assemblages of metallogenetic elements, they can be divided into four types(Cu-Zn, Cu-S, Pb-Zn-Cu and Pb-Zn types) with the Cu-Zn and Pb-Zn types being the most impor-tant ones. Research of isotopic chronology shows that the VMS deposits in Xinjiang were formedduring the Proterozoic, Ordovician, Deovonian, Carboniferous and Permian periods and usuallyunderwent multi-stage mineralization, especially the large-sized deposits usually have post-volcanic superimposed mineralization by tectonomagmatic or metamorphic hydrothermal metal-logenic fluids.     

Fast Characterization of Constituents in HuangKui Capsules Using UPLC�CQTOF-MS with Collision Energy and MassFragment Software

In this paper, ultra performance liquid chromatography (UPLC)?Cquadrupole-time-of-flight mass spectrometry (QTOF) with collision energy (MS ^E ) and MassFragment software were applied for fast separation and characterization of constituents in HuangKui Capsules (HKC). MS ^E was used for simultaneous acquisition of precursor ion information and fragment ion data at high and low collision energy in one analytical run, which facilitated the fast structural characterization of 12 constituents in HKC. When the reference compound was not available, MassFragment software was used to confirm the proposed structure, which increased our confidence in the MS fragment analysis of the proposed structure, facilitating the confirmation of the proposed structure and therefore easing the data processing procedure. In conclusion, UPLC?CQTOF-MS ^E and MassFragment software described in this paper proved to be useful for the identification of constituents in complex herbal medicines and could greatly decrease analytical time. In addition, this method may be applied to the analysis of more complex data found in Traditional Chinese Medicine.