Magnetic Anisotropies in Cobalt-Nickel Ferrites (NixCo1-xFe2O4)

Binghai Liu,Jun Ding,Jiabao Yi,Jianhua Yin,Zhili Dong 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5

This work presents a detailed study on the various magnetic anisotropies of NixCo1..xFe2O4 prepared by using a mechanochemical process. The results indicated that the magnetic anisotropy of NixCo1..xFe2O4 was strongly correlated with the Co2+ concentration. The Ni2+ substitution readily led to a decrease in the magnetocrystalline anisotropy and coercivity. While a large uniaxial anisotropy was induced in CoFe2O4 by magneto-annealing, the uniaxial anisotropy decreased with the Ni concentration in NixCo1..xFe2O4 and disappeared in the pure NiFe2O4. A short-time mechanical milling was found to signicantly increase the coercivity in NixCo1..xFe2O4 samples and high coercivities of 5.1 kOe and 2.8 kOe were achieved in the CoFe2O4 and the Ni0:5Co0:5Fe2O4 samples respectively. The microstructure and magnetic studies indicated that the milling-induced high coercivity could be ascribed to milling-induced stress anisotropy and to the pinning eects of defects. This work presents a detailed study on the various magnetic anisotropies of NixCo1..xFe2O4 prepared by using a mechanochemical process. The results indicated that the magnetic anisotropy of NixCo1..xFe2O4 was strongly correlated with the Co2+ concentration. The Ni2+ substitution readily led to a decrease in the magnetocrystalline anisotropy and coercivity. While a large uniaxial anisotropy was induced in CoFe2O4 by magneto-annealing, the uniaxial anisotropy decreased with the Ni concentration in NixCo1..xFe2O4 and disappeared in the pure NiFe2O4. A short-time mechanical milling was found to signicantly increase the coercivity in NixCo1..xFe2O4 samples and high coercivities of 5.1 kOe and 2.8 kOe were achieved in the CoFe2O4 and the Ni0:5Co0:5Fe2O4 samples respectively. The microstructure and magnetic studies indicated that the milling-induced high coercivity could be ascribed to milling-induced stress anisotropy and to the pinning eects of defects.

Electron Emission Originated from Free-Electron-like States of Alkali-Doped Boron−Nitride Nanotubes

Yan, Binghai,Park, Changwon,Ihm, Jisoon,Zhou, Gang,Duan, Wenhui,Park, Noejung American Chemical Society 2008 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.130 No.50

<P>We investigate the electronic structures and electron emission properties of alkali-doped boron-nitride nanotubes (BNNTs) using density-functional theory calculations. We find that the nearly free-electron (NFE) state of the BNNT couples with the alkali atom states, giving rise to metallic states near the Fermi level. Unlike the cases of potassium-doped carbon nanotubes, not only the s but the d orbital state substantially takes part in the hybridization, and the resulting metallic states preserve the free-electron-like energy dispersion. Through first-principles electron dynamic simulations under applied fields, it is shown that the alkali-doped BNNT can generate an emission current 2 orders of magnitude larger than the carbon nanotube. The nodeless wave function at the Fermi level, together with the lowered work function, constitutes the major advantage of the alkali-doped BNNT in electron emission. We propose that the alkali-doped BNNT should be an excellent electron emitter in terms of the large emission current as well as its chemical and mechanical stability.</P>

Fabrication and Application of Gel-Forming CeO2 Fixed Abrasive Tools for Quartz Glass Polishing

Kaiping Feng,Binghai Lyu,Tianchen Zhao,Tao Yin,Zhaozhong Zhou 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.9

A gel-forming cerium dioxide (CeO2) fixed abrasive tool for quartz glass polishing was proposed to improve abrasive utilization. The effects of the solid content of polyvinyl alcohol (PVA) and phenolic (PF) resin on the mechanical properties, micromorphology, and friction properties of gel-forming CeO2 abrasive tools were analyzed. The effects of dispersant and coupling agents on the micromorphology of the gel-forming CeO2 abrasive tools were analyzed. The microstructure uniformity, hardness uniformity, and friction coefficient stability of the gel-forming and the hot pressing forming CeO2 abrasive tools were compared and analyzed. The polishing effects of the gel-forming CeO2 abrasive tools, hot pressing CeO2 abrasive tools and ceria slurry on quartz glass were compared. The results showed that when the solid content of PVA was 6 wt%, the solid content of PF was 8 wt%, the concentration of the PEI dispersant was 1 wt% and the KH550 coupling agent concentration was 1.5 wt%, the mechanical properties and friction performance of the gel-forming CeO2 abrasive tools is the best. Gel-forming abrasive tools were superior to hot pressing abrasive tools in terms of microstructure uniformity, hardness uniformity, and friction coefficient stability. The polishing experiments showed that after polishing by the gel-forming abrasive tool, the average surface roughness Ra reached 2.49 nm, which was better than polishing by the hot pressing abrasive tools and reached the polishing effect of ceria slurry. The flatness PV reached 0.660 µm, which was far better than that of ceria slurry.

Stacking-dependent energetics and electronic structure of ultrathin polymorphicV2VI3topological insulator nanofilms

Li, Can,Winzer, Torben,Walsh, Aron,Yan, Binghai,Stampfl, Catherine,Soon, Aloysius American Physical Society 2014 Physical review. B, Condensed matter and materials Vol.90 No.7

Visualizing a new relaxation regime of hot electrons in quasi-one-dimensional nanowires

Jonathan REINER,Abhay KUMAR-NAYAK,Nurit AVRAHAM,Binghai YAN,Ion Cosma FULGA,Torsten KARZIG,Jung-Hyun KANG,Hadas SHTRIKMAN,Haim BEIDENKOPF 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.8

Influences of Nitrogen Fertilization Level on Timothy Silage Fermentation Quality, Nutritive Value, and Nutrient Intake in Sheep

Peng Wang,Kousaku Souma,Tastunori Yano,Masayuki Nakano,Hideki Okamoto,Binghai Cao,Chihiro Sato,Takayoshi Masuko 한국초지조사료학회 2009 한국초지조사료학회 학술대회논문집 Vol.2009 No.08

The objective of this study was evaluated the influences of the nitrogen fertilization level on timothy silage fermentation quality, nutritive value, and nutrient intake. In both the first and second crops, high level nitrogen fertilization (H) led to a lower WSC content and higher CP content than standard nitrogen fertilization (S). The silage fermentation quality was good in the presence of a Lactobacillus inoculant (SI and HI) than uninoculant (SC and HC). In the first crop silage, the TDN content and intake were significantly higher (P<0.01) for HI than for SI. In the second silage, the DM, DE, and TDN intakes did not significantly differ among the 4 treatments.

Sequencing and Characterization of Divergent Marbling Levels in the Beef Cattle (Longissimus dorsi Muscle) Transcriptome

Chen, Dong,Li, Wufeng,Du, Min,Wu, Meng,Cao, Binghai Asian Australasian Association of Animal Productio 2015 Animal Bioscience Vol.28 No.2

Marbling is an important trait regarding the quality of beef. Analysis of beef cattle transcriptome and its expression profile data are essential to extend the genetic information resources and would support further studies on beef cattle. RNA sequencing was performed in beef cattle using the Illumina High-Seq2000 platform. Approximately 251.58 million clean reads were generated from a high marbling (H) group and low marbling (L) group. Approximately 80.12% of the 19,994 bovine genes (protein coding) were detected in all samples, and 749 genes exhibited differential expression between the H and L groups based on fold change (>1.5-fold, p<0.05). Multiple gene ontology terms and biological pathways were found significantly enriched among the differentially expressed genes. The transcriptome data will facilitate future functional studies on marbling formation in beef cattle and may be applied to improve breeding programs for cattle and closely related mammals.

Sequencing and Characterization of Divergent Marbling Levels in the Beef Cattle (Longissimus dorsi Muscle) Transcriptome

Dong Chen,Wu Feng Li,Min Du,Meng Wu,Binghai Cao 아세아·태평양축산학회 2015 Animal Bioscience Vol.28 No.2

Marbling is an important trait regarding the quality of beef. Analysis of beef cattle transcriptome and its expression profile data are essential to extend the genetic information resources and would support further studies on beef cattle. RNA sequencing was performed in beef cattle using the Illumina High-Seq2000 platform. Approximately 251.58 million clean reads were generated from a high marbling (H) group and low marbling (L) group. Approximately 80.12% of the 19,994 bovine genes (protein coding) were detected in all samples, and 749 genes exhibited differential expression between the H and L groups based on fold change (>1.5-fold, p<0.05). Multiple gene ontology terms and biological pathways were found significantly enriched among the differentially expressed genes. The transcriptome data will facilitate future functional studies on marbling formation in beef cattle and may be applied to improve breeding programs for cattle and closely related mammals.

Effect of surface quality on hydrogen/helium irradiation behavior in tungsten

Hongyu Chen,Qiu Xu,Jiahuan Wang,Peng Li,Julong Yuan,Binghai Lyu,Jinhu Wang,Kazutoshi Tokunaga,Gang Yao,Laima Luo,Yucheng Wu 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.6

As the plasma facing material in the nuclear fusion reactor, tungsten has to bear the irradiation impact ofhigh energy particles. The surface quality of tungsten may affect its irradiation resistance, and even affectthe service life of fusion reactor. In this paper, tungsten samples with different surface quality werepolished by mechanical processing, subsequently conducted by D2þ implantation and thermal desorption. D2þ implantation was performed at room temperature (RT) with the irradiation dose of 1 1021D2þ/m2 by 5 keV D2þ ions, and thermal desorption spectroscopy measurements were done from RT to900 K. In addition, He irradiation was also performed by 50 eV Heþ ions energy with the fluxes of5.5 1021 m2s1 and 1.5 1022 m2s1, respectively. Results reveal that the hydrogen/helium irradiation behavior are both related to surface quality. Samples with high surface quality has superior D2þretention behavior with less D2 retained after implantation. However, such samples are more likely togenerate fuzzes on the surface after helium irradiation. Different morphologies (smooth, wavy, pyramids)after helium irradiati

Long-term continuously monocropped peanut significantly disturbed the balance of soil fungal communities

Chen Mingna,Zhang Jiancheng,Liu Hu,Wang Mian,Pan LiJuan,Chen Na,Wang Tong,Jing Yu,Chi Xiaoyuan,Du Binghai 한국미생물학회 2020 The journal of microbiology Vol.58 No.7

Balancing soil microbial diversity and abundance is critical to sustaining soil health, and understanding the dynamics of soil microbes in a monocropping system can help determine how continuous monocropping practices induce soil sickness mediated by microorganisms. This study used previously constructed gradient continuous monocropping plots and four varieties with different monocropping responses were investigated. The feedback responses of their soil fungal communities to short-term and long-term continuous monocropping were tracked using high-throughput sequencing techniques. The analyses indicated that soil samples from 1 and 2 year monocropped plots were grouped into one class, and samples from the 11 and 12 year plots were grouped into another, regardless of variety. At the species level, the F. solani, Fusarium oxysporum, Neocosmospora striata, Acrophialophora levis, Aspergillus niger, Aspergillus corrugatus, Thielavia hyrcaniae, Emericellopsis minima, and Scedosporium aurantiacum taxa showed significantly increased abundances in the long-term monocropping libraries compared to the short-term cropping libraries. In contrast, Talaromyces flavus, Talaromyces purpureogenus, Mortierella alpina, Paranamyces uniporus, and Volutella citrinella decreased in the long-term monocropping libraries compared to the shortterm libraries. This study, combined with our previous study, showed that fungal community structure was significantly affected by the length of the monocropping period, but peanut variety and growth stages were less important. The increase in pathogen abundances and the decrease in beneficial fungi abundances seem to be the main cause for the yield decline and poor growth of long-term monocultured peanut. Simplification of fungal community diversity could also contribute to peanut soil sickness under long-term monocropping. Additionally, the different responses of peanut varieties to monocropping may be related to variations in their microbial community structure.