Hydrothermal quartz samples collected from the Fujiashan and Yipanqiu deposits in southeastern Hubei Province, China have been investigated by analytical combination of optical microscopy, scanning electron inductively coupled plasma emission spectroscopy, conjunction with conventional beneficiation processing to evaluate their potential as sources high purity (HPQ) a commercial perspective. Mi...

Organic compounds are produced in vast quantities for industrial and agricultural use, as well as for human and animal healthcare [1]. These chemicals and their metabolites are frequently detected at trace levels in fresh water environments where they undergo degradation via different reaction pathways. Compound specific stable isotope analysis (CSIA) is a valuable tool to identify such degrada...

In the study presented here, we investigated K-Ar age determination and petrological significance of trace element compositions Bitlis (Eastern Anatolia) ignimbrites associated with explosive activities well-known Nemrut volcano. geochronological dating ignimbrite flow deposits gave 790 ka which corresponds to first products pre-caldera stages stratovolcano. trachydacitic shoshonitic affinity a...

In this paper, a type of multi-level correction scheme is proposed to solve eigenvalue problems by the nonconforming finite element method. With this new scheme, the accuracy of eigenpair approximations can be improved after each correction step which only needs to solve a source problem on finer finite element space and an eigenvalue problem on the coarsest finite element space. This correctio...

In this paper, a type of multi-level correction scheme is proposed to solve eigenvalue problems by the finite element method. This type of multilevel correction method includes multi correction steps in a sequence of finite element spaces. In each correction step, we only need to solve a source problem on a finer finite element space and an eigenvalue problem on the coarsest finite element spac...