Rare earth elements are important resources and they can be widely used in smart phones, electric vehicles, home appliances, etc. Recently, countries around the world pay attentions to their own rare set policies cope with country's future development. Therefore, have obviously become valuable strategic materials. minerals mainly occurred placer depositions Taiwan. The literature on Taiwan is quite limited; there only a few studies characteristics of heavy sand deposits, about distribution...

Hematite (Fe 2 O 3 ) thin films with different thicknesses are fabricated by the rf magnetron sputtering deposition. The effects of film on photocatalytic activity hematite have been investigated. possess a polycrystalline hexagonal structure, and band gap decreases an increase thickness. Moreover, all exhibit good ability under visible-light irradiation; increases increasing This is because thicker thickness has rougher surface, providing more reaction sites for photocatalysis. Another...

This study was conducted to investigate the adsorption and desorption properties of arsenate [As(V)] on nano-sized iron-oxide-coated quartz (IOCQ) through batch experiments. The coating iron oxide surface performed using heat treatment process which aimed utilize filtration quartz. Environmental SEM-EDAX BET techniques were used analyze morphology, elemental composition, area porosity adsorbent. analyses confirmed that adsorbed IOCQ surface. results showed adsorbent had higher pore volumes...

Iron oxide nanorings have great promise for biomedical applications because of their magnetic vortex state, which endows them with a low remanent magnetization while retaining large saturation magnetization. Here we use micromagnetic simulations to predict the exact shapes that can sustain vortices, using toroidal model geometry variable diameter, ring thickness, and eccentricity. Our phase diagram is then compared experimental geometries obtained by electron tomography. High axial...

An increasing number of Internet applications and services render network management more troublesome for bandwidth misuse security concern. As a result, traffic identification plays an increasingly important role in management. Deep packet inspection (DPI) is one the effective approaches. Conventional devices lookup header packet, but DPI means device required to match pattern payload packet. This study proposes system WMT (Wu-Manber with trie) algorithm classify popular services; The...

The RAPD (reach-through avalanche photodiode) structure is adopted to improve the electrical and optical performance of photosensing devices made a-Si:H. Both electron-injection n/sup +/ -i- delta p-i-p/sup hole-injection p/sup +/-i- n-i-n/sup a-Si:H RAPDs are fabricated on indium-tin-oxide-coated glass substrates by plasma-enhanced chemical vapor deposition (PECVD). photocurrent multiplication method employed study factors impact ionization coefficients RAPDs. Since models have better...

In order to improve the performance of a(amorphous)-Si:H/SiC:H superlattice avalanche photodiode (APD), a-Si:H/SiC:H reach-through APDs (SRAPDs) have been fabricated on ITO(indium tin oxide)/glass substrates by plasma-enhanced chemical vapor deposition (PECVD). For a typical electron-injection SRAPD, ratio room-temperature electron and hole impact ionization rates ( alpha / beta ) is 10.2 at an electric field 3.33*10/sup 6/ V/cm, optical gain 506 applied reverse-bias V/sub R/=18 V incident...

(LSMO) thin films with a polycrystalline structure of variable thickness were deposited by radio-frequency magnetron sputtering system on substrate. The ferromagnetic property and electrical transport increased increasing film thickness. This can be considered as the result small deformation Mn-O bond length/bond angle due to relaxation tensile strain, which enhances ferromagnetotransport properties. Additionally, there is an oxide layer found at interface between substrate from transmission...

Abstract Smythite (Fe 9 S 11 ) is an occasionally reported magnetic iron sulfide mineral that occurs in varied geological settings and co‐occurs commonly with other minerals. Determining the properties of smythite important for understanding its distribution paleomagnetic environmental significance. We report sedimentary occurrences from three locations Taiwan (one terrestrial two marine), which suggest forms methanic diagenetic environments into has been reintroduced. our purest sample,...

(LSMO) films of with and without (100)-preferred orientation were fabricated on substrates. A slight oxygen deficiency high tensile stress found in LSMO films. All the exhibit a ferromagnetic transition at temperature around 250 K metal-insulator much lower. However, significant increase saturated magnetization decrease resistivity along raise are observed film orientation. The change property is attributed to alleviation Jahn-Teller distortion induced by thermal having different preferred...

Spin-wave excitations in α-Fe2O3 nanorods were directly detected using time-of-flight inelastic neutron spectroscopy. The dispersive magnon features are compared with those bulk particles at various temperatures to highlight differences mode intensity and width. interchanged spectral intensities the nanorod a consequence of suppressed spin orientation, this is also evident diffraction which demonstates that weak ferromagnetic phase survives 1.5 K. Transmission electron microscopy shows...

Polycrystalline films of with and without (100)-preferred orientation are fabricated on highly N-doped Si substrates. Spatial inhomogeneities conducting insulating domains that coexisted in submicrometer scale were observed by conductive atomic force microscopy (CAFM). The inhomogeneity occurs within a grain for the film orientation, but has among grains. undergo percolative metal-insulator transition, transition temperature from CAFM is consistent to result magnetoresistance measurement,...

Abstract not Available.

Abstract not Available.