Trace element compositions of pyrite and stibnite:implications for the genesis of antimony mineralization in the Yangla Cu skarn deposit,Northwestern Yunnan,China

The Yangla Cu skarn deposit is located in the central part of the Jinshajiang Suture Zone,southwest China,with a total reserve of 150 Mt Cu@1.03%.The newly discovered antimony orebodies at the depth of Yangla are strictly controlled by the stratum,structure,and lithology,which are lenticular and vein-like within the marble fracture zone,which can provide a window into multistage miner-alization and ore genesis at Yangla.Mineralization can be divided into three types,Cu–Pb–Zn(skarn)pyrite,galena,and sphalerite,Cu(porphyry)chalcopyrite and pyrite,and Sb(hydrothermal)stibnite and pyrite.The mineral assem-blages were stibnite+pyrite+calcite+quartz±minor scheelite in antimony ores.This study presents quantitative measurements of the trace element compositions of pyrite and stibnite from the Yangla antimony ores.Analysis of pyrite with electron probe microanalysis(EPMA)showed enrichment in Co,Ni,Sb,As,and Mo,and deficit in its S and Fe contents when compared to the stoichiometric con-centrations of S and Fe in pyrite.The Sb-related pyrite may belong to sedimentary-reworked genesis and may be modi-fied by hydrothermalfluids,thereby presenting a certain dif-ference(i.e.,crystal morphology,texture,and chemical com-position)compared to the skarn and porphyry Cu-related pyrite in the Yangla Cu skarn deposit.Analysis of stibnite with EPMA and inductively coupled plasma-mass spectrom-etry showed enrichment in As,Pb,Sn,Pb,Cu,and Zn,and presented much higher Sb contents and slightly lower S con-tents when compared to the stoichiometric concentrations of Sb and S in stibnite.Statistical analysis of the stibnite trace elements showed correlations for the elemental pairs Cu–Pb,As–Sb,and Sn–Pb,and the coupled substitution equations Sb^(3+)↔Cu^(+)+Pb^(2+),Sb^(3+)↔As^(3+),and Sn^(2+)↔Pb^(2+)may be the major factors governed the incorporating Cu,Pb,As and Sn within the stibnite.Moreover,this study preliminary shows that the antimony mineralization may belong to a car-bonate replacement hydrothermal genesis at Yangla.

Effects of T-Factor on Quantum Annealing Algorithms for Integer Factoring Problem

The hardness of the integer factoring problem(IFP)plays a core role in the security of RSA-like cryptosystems that are widely used today.Besides Shor’s quantum algorithm that can solve IFP within polynomial time,quantum annealing algorithms(QAA)also manifest certain advantages in factoring integers.In experimental aspects,the reported integers that were successfully factored by using the D-wave QAA platform are much larger than those being factored by using Shor-like quantum algorithms.In this paper,we report some interesting observations about the effects of QAA for solving IFP.More specifically,we introduce a metric,called T-factor that measures the density of occupied qubits to some extent when conducting IFP tasks by using D-wave.We find that T-factor has obvious effects on annealing times for IFP:The larger of T-factor,the quicker of annealing speed.The explanation of this phenomenon is also given.

CREEP DAMAGE AND FRACTURE

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Hysteroscopic Appearence of Midsecretory Endometrium in Relation to Pinopodes Expression and the Reproductive Outcome in Infertile Women

Objective To investigate the relation between hysteroscopic finding and pinopodes expression, meanwhile to explore whether hysteroscopic finding was a predictor of reproductive outcome for infertile women. Methods A total of 79 infertile patients underwent hysteroscopic assessement of the midsecretory endometrium and hormonal measurement 7 9 d after a spontaneous ovulation assessed with transvaginal ultrasound. Pinopodes expression by scanning electron microscope was examined simultaneously in randomly selected 32 patients. All patients were followed up to determine their reproductive outcomes. Results Twenty-six （32.9%） patients were diagnosed as having ＇good＇ midsecretory endometrium and 53 （67.1%） as ＇poor＇ midsecretory endometrium by hysteroscopy. There were no significant differences of endometrial thickness and pattern in the ＇good＇ group compared with the ＇poor＇ group. Serum progesterone level in the ＂good＇ group was apparently higher than that in the ＇poor＇ group （P=0.025）, but no correlation was observed between serum oestradiol level and hysteroscopic finding. Significant differences of the development stage and number of pinopodes were observed between the two groups （P〈O.05）. The pregnancy rate was significantly higher in the ＇good＇ group （53.9%） than in the ＇poor＇ group （26.4%） （P=O.O17）. Conclusion The hysteroscopic appearance of the midsecretory endometrium is associated with serum progesterone level and pinopodes expression, which provides prognostic information with regard to the reproductive outcome of infertile women.

Electrochemical formation of La-Al intermetallic compounds in fluoride melts

The electrochemical formation of La-Al alloys in LiF-CaF_(2)molten salt on a molybdenum electrode at 1123 K was investigated by electrochemical techniques,such as cyclic voltammetry,square-wave voltammetry and open-circuit chronopotentiometry.The formation signals of four types of Al-La intermetallic compounds were observed.The Al-La alloy was obtained through galvanostatic electrolysis at 2.5 A·cm^(-2)for 3 h.The phase composition and microstructure of the electrolytic products were analysed by X-ray diffraction(XRD)and scanning electron microscopy with energy-dispersive spectroscopy(EDS).XRD results show that the phase compositions of the alloys are Al_(11)La_(3)and Al,and EDS results reveal 26.7 at%La in the alloy.