[en] Based on the analysis on the size and thickness of sand body in Mengqiguer deposit, and the shape of ore body in section, this paper discussed the relationship between sand body and uranium mineralization, pointed out that in the process of uranium mineralization, the stability of the sand body is a favorable environment; the change of micro-faces such as sand body thickness, number of muddy intercalation layer and grain size significantly affected the precipitation and enrichment of uranium and the formation of ore body. (authors)

[en] This paper presents a means of polychromatic X-ray beam hardening correction using a standard function to transform the polychromatic projection to monochromatic projection in large Industrial Computed Tomography (ICT). Some parameters were defined to verify the validity of hardening correction in large ICT and optimized. Simulated experiments were used to prove that without prior knowledge of the composition of the scanned object, the correction method using monochromatic reconstruction arithmetic could remove beam hardening artifact greatly. (authors)

[en] L-Glutathione (GSH) capped CdTe quantum dots (QDs) (GSH@CdTe QDs) have been successfully synthesized. GSH@CdTe QDs could selectively detect Ag⁺ by fluorescence emission spectrometry in aqueous medium. The fluorescence intensity of GSH@CdTe QDs linearly increased upon increasing concentrations of Ag⁺. The detecting limit of Ag⁺ was found to be 1.3 nM calculated from the linear concentration range of 0.02-0.2 μM. The other foreign mental ions displayed no significant response revealing good selectivity of the sensors towards Ag⁺. The experimental results indicated the GSH@CdTe QDs were well applied as fluorescence sensor to detect Ag⁺ in aqueous with high sensitivity and selectivity. Furthermore, it was found that the enhancement of fluorescence intensity arose from the formation of Ag₂Te which modified the surface traps on GSH@CdTe QDs. - Highlights: • We synthesized GSH@CdTe QDs in aqueous solution with good fluorescent stability. • The GSH@CdTe QDs can be used as a fluorescent sensor for Ag+detection in water solution with good selectivity and sensitivity. • The GSH@CdTe QDs were used to detect Ag+based on the enchanced fluorescence methods.

[en] Two novel carbazole-based Schiff-bases L1 and L2 have been synthesized and characterized by ¹H NMR, ¹³C NMR, FT-IR spectroscopy and elemental analysis. L1 can selectively detect Fe³⁺ by UV–vis spectroscopy and Fe³⁺/Cr³⁺ by fluorescent spectroscopy in CH₃CN among various metal ions. The addition of Fe³⁺ ions to a L1 solution results in a significant blue-shift from 410 nm to 378 nm accompanied with color change from yellowish green to colorless. Upon excitation at 380 nm, the addition of Fe³⁺ or Cr³⁺ causes a 13-fold or 11-fold fluorescence enhancement. The binding stoichiometry ratio of L1–Fe³⁺ and L1–Cr³⁺ is recognized as 2:1 by the method of Job's plot, and the possible binding mode of the system also proposes. The results indicate that L1 is an ideal chemosensor for Fe³⁺ and Cr³⁺ recognition. However, L2 without hydroxyl in ortho imino group cannot selectively recognize the tasted metal ions, indicating that the introduction of the appropriate coordination binding site to receptor can improve efficiently the selectivity of chemosensor. - Highlights: • We designed and synthesized two new carbazole-based Schiff bases L1 and L2. • L1 could selectively recognize Fe³⁺ but L2 could not, which suggested that increase recognition site helped to improve the selectivity of probe. • L1 not only could serve as a highly selective visual chemosensor for Fe³⁺ ion without the aid of any instruments, but also could be used as a fluorescent chemosensor for Fe³⁺ and Cr³⁺

[en] We performed millimeter observations in CO lines toward the supernova remnant (SNR) G127.1+0.5. We found a molecular filament at 4-13 km s^–1 consisting of two distinct parts: a straight part coming out of the remnant region and a curved part in the remnant region. The curved part is coincides well with the bright SNR shell detected in 1420 MHz radio continuum and mid-infrared observations in the northeastern region. In addition, redshifted line wing broadening is found only in the curved part of the molecular filament, which indicates a physical interaction. These provide strong evidences, for the first time, to confirm the association between an SNR and a pre-existing long molecular filament. Multi-band observations in the northeastern remnant shell could be explained by the interaction between the remnant shock and the dense molecular filament. RADEX radiative transfer modeling of the quiet and shocked components yield physical conditions consistent with the passage of a non-dissociative J-type shock. We argue that the curved part of the filament is fully engulfed by the remnant's forward shock. A spatial correlation between aggregated young stellar objects (YSOs) and the adjacent molecular filament close to the SNR is also found, which could be related to the progenitor's activity.

[en] Objective: To search for a new, simple, rapid, safe and effective method with combination of hystero. Salingography and fallopian tube recanalization. Methods: After the double-lumen balloon catheter was inserted into the uterine cavity and then followed by saline or air injection into to the saccule. The internal os of cervix was thus blocked by the filled saccule. Iohexol was injected into uterine cavity and fallopian tubes to undertake hystero-salingography and selective radiography under the television observation. In case of obstruction the fallopian tube recanalization could be obtained by manual increasing the contrast injection pressure into the uterine cavity. Results: 2698 cases including 811 primary infertile women and 1887 cases of secondary infertilities were examed by this method. The number of obstructed fallopian tube was 3082 including 1561 right fallopian tubes and 1521 left ones. The rate of tube obstruction was 77.77% and that of tube recanalization was 88.96% including 2397 branches recanalized completely and 322 partially recanalizd. The venous reflux was found in 27 cases and light complications included slight vagina bleeding, mild transient spastic pain without mortality. Conclusion: This method of combining hystero-salinography and fallopian tube recanalization, is safe, effective, economic and practical for infertile women with quick procedure process; and worthy to be recommended. (authors)

[en] We have carried out ¹²CO, ¹³CO, and C¹⁸O observations toward the mixed morphology supernova remnant (SNR) IC 443. The observations cover a 1.°5 × 1.°5 area and allow us to investigate the overall molecular environment of the remnant. Some northern and northeastern partial shell structure of CO gas is around the remnant. One of the partial shells, about 5' extending beyond the northeastern border of the remnant's bright radio shell, seems to just confine the faint radio halo. On the other hand, some faint CO clumps can be discerned along the eastern boundary of the faint remnant's radio halo. Connecting the eastern CO clumps, the northeastern partial shell structures, and the northern CO partial shell, we can see that a half molecular ring structure appears to surround the remnant. The LSR velocity of the half-ring structure is in the range of –5 km s^–1 to –2 km s^–1, which is consistent with that of the –4 km s^–1 molecular clouds. We suggest that the half-ring structure of the CO emission at V _LSR ∼ –4 km s^–1 is associated with the SNR. The structures are possibly swept up by the stellar winds of SNR IC 443's massive progenitor. Based on the Wide-field Infrared Survey Explorer and the Two Micron All Sky Survey near-IR database, 62 young stellar object (YSO) candidates are selected within the radio halo of the remnant. These YSO candidates concentrated along the boundary of the remnant's bright radio shell are likely to be triggered by the stellar winds from the massive progenitor of SNR IC 443.

[en] Ni50/(Ti, W)C composite coating was produced by laser cladding. The effect of ball milling process on the homogenization of coating microstructure and coating properties was studied. The microstructure, phase composition, microhardness, and wear resistance of the coating were investigated. The formation and growth of in situ synthesized ceramic particles were analyzed. The results showed that the coating presented a dense and homogeneous microstructure with few pores and no cracks. Ceramic particles (Ti, W)C were in situ synthesized in Ni-based coating. The fining of different kinds of powders can also lead to different microstructure of coatings. A large number of fine and irregular (Ti, W) C precipitated from the composite coating by laser cladding with ball milled Ti + W powder. When the composite powders were milled, the coating was not only reinforced phase, but also the matrix phase γ-(Fe, Ni) content increased. After laser cladding, the composite powders which only ball milling Ti + W powders, the microhardness and wear resistance of the composite coating were improved.

[en] The effect of spring snowmelt infiltration in a seasonal soil frost area on groundwater recharge was evaluated by systematically monitoring meteorological factors, soil temperature and humidity, groundwater table and temperature, electrical conductivity, and the value of δ¹⁸O in a small field site over a 2-year period. The variation of soil temperature and humidity, groundwater table during the freezing period, and the snowmelt period respectively, as well as their correspondence to the relevant environmental factors, and the influencing factors of the permeability of frozen layer were analyzed. The results showed that the evaluation of precipitation infiltration in seasonal soil frost areas should be divided into three stages: a non-freezing period, a freezing period, and a snowmelt period. Snow is the main form of precipitation during the freezing period, and groundwater cannot be recharged. During the snowmelt period of spring, the snow cover that accumulated during the freezing period infiltrates together with rainfall and has a significant effect on groundwater recharge. The general precipitation infiltration process occurs after the frozen soil thaws completely. These research results can improve the accuracy of groundwater recharge calculations for snowmelt infiltration in the seasonal soil frost area of Northeast China and provide a scientific basis for the evaluation and management of regional water resources.

[en] The Galactic plane has been mapped from l = 34.°75 to 45.°25 and b = −5.°25 to 5.°25 in the CO (J = 1–0) emission with the 13.7 m telescope of the Purple Mountain Observatory. The unbiased survey covers a large area of 110 square degrees sampled every 30″ with a velocity resolution of $\sim <!--\; ???\; -->0.2\mathrm{k}\mathrm{m}{\mathrm{s}}^{-<!--\; ???\; -->1}$. In this paper, we present the result of an unbiased CO survey of this longitude and latitude range in the velocity range from −60 to $-<!--\; ???\; -->10\mathrm{k}\mathrm{m}{\mathrm{s}}^{-<!--\; ???\; -->1}$. Over 500 molecular clouds (MCs) are picked out from the ¹²CO (J = 1–0) emission, and 131 of these MCs are associated with ¹³CO emission. The distant MCs, which lie beyond the solar circle and are mostly concentrated in the Galactic plane, trace the large-scale molecular gas structure over 10 degrees of Galactic azimuth. We find that the distribution of the distant MCs can be well fitted by a Gaussian function with a full width at half maximum (FWHM) of 0.°7 with the Galactic latitude. We suggest that the CO emission of the segment is from the Outer Arm. The physical mid-plane traced by the Outer Arm seems to be slightly displaced from the IAU-defined plane on a large scale, which could be explained by the warped plane at large Galactocentric distances of ≳10 kpc and the apparent tilted mid-plane to the projected IAU-defined plane caused by the Sun’s z-height above the disk for distances near and within the Solar circle. After removing the effect of the warp and tilted structure, the scale height of the MCs in the Outer Arm is about 0.°6 or 160 pc at a heliocentric distance of 15 kpc. If the inner plane of our Galaxy is flat, we can derive an upper limit of the Sun’s offset of ∼17.1 pc above the physical mid-plane of the Milky Way. We also discuss the correlations between the physical parameters of the distant MCs, which is quite consistent with the result of other studies of this parameter.