[Poster Presentation] THE EFFECT OF FORMATION OF PAPER FROM EUCALYPTUS CHEMIMECHANICAL PULP ON PRINTABILITY

Kai-Tang HU,Guo-Min TAN,Qi-Rong Fu,Nam-Soek Cho 한국펄프·종이공학회 1999 한국펄프종이학회 기타 간행물 Vol.- No.-

The relation between the paper formation analyzed by image process system and smoothness, compressibility, uniform of ink absorption is studied. The results indicate that the paper with bad formation has higher apparent bulk than the paper with good formation. The bad formation of paper results in the nonuniform calendering and decrease of the compressibility. The bad formation of paper also results in deformation and omission of printing dots, which affects the reproduction of the printing images.

VALUE SHARING RESULTS OF A MEROMORPHIC FUNCTION f(z) AND f(qz)

Qi, Xiaoguang,Liu, Kai,Yang, Lianzhong Korean Mathematical Society 2011 대한수학회보 Vol.48 No.6

In this paper, we investigate sharing value problems related to a meromorphic function f(z) and f(qz), where q is a non-zero constant. It is shown, for instance, that if f(z) is zero-order and shares two valves CM and one value IM with f(qz), then f(z) = f(qz).

Preliminary Application of High-Definition CT Gemstone Spectral Imaging in Hand and Foot Tendons

Kai Deng,Cheng-Qi Zhang,Wei Li,Jun-Jun Wang,Xin-Yi Wang,Tao Pang,Guang-Li Wang,Cheng Liu 대한영상의학회 2012 Korean Journal of Radiology Vol.13 No.6

Objective: To assess the feasibility of visualizing hand and foot tendon anatomy and disorders by Gemstone Spectral Imaging (GSI) high-definition CT (HDCT). Materials and Methods: Thirty-five patients who suffered from hand or foot pain were scanned with GSI mode HDCT and MRI. Spectrum analysis was used to select the monochromatic images that provide the optimal contrast-to-noise ratio (CNR) for tendons. The image quality at the best selected monochromatic level and the conventional polychromatic images were compared. Tendon anatomy and disease were also analyzed at GSI and MRI. Results: The monochromatic images at about 65 keV (mean 65.09 ± 2.98) provided the optimal CNR for hand and foot tendons. The image quality at the optimal selected monochromatic level was superior to conventional polychromatic images (p = 0.005, p < 0.05). GSI was useful in visualizing hand and foot tendon anatomy and disorders. There were no statistical differences between GSI and MRI with regard to tendon thickening (χ2 = 0, p > 0.05), compression (χ2 = 0.5, p > 0.05), absence (χ2 = 0, p > 0.05) and rupture (χ2 = 0, p > 0.05). GSI was significantly less sensitive than MRI in displaying tendon adhesion (χ2 = 4.17, p < 0.05), degeneration (χ2 = 4.17, p < 0.05), and tendinous sheath disease (χ2 = 10.08, p < 0.05). Conclusion: GSI with monochromatic images at 65 keV displays clearly the most hand and foot tendon anatomy and disorders with image quality improved, as compared with conventional polychromatic images. It may be used solely or combined with MRI in clinical work, depending on individual patient disease condition. Objective: To assess the feasibility of visualizing hand and foot tendon anatomy and disorders by Gemstone Spectral Imaging (GSI) high-definition CT (HDCT). Materials and Methods: Thirty-five patients who suffered from hand or foot pain were scanned with GSI mode HDCT and MRI. Spectrum analysis was used to select the monochromatic images that provide the optimal contrast-to-noise ratio (CNR) for tendons. The image quality at the best selected monochromatic level and the conventional polychromatic images were compared. Tendon anatomy and disease were also analyzed at GSI and MRI. Results: The monochromatic images at about 65 keV (mean 65.09 ± 2.98) provided the optimal CNR for hand and foot tendons. The image quality at the optimal selected monochromatic level was superior to conventional polychromatic images (p = 0.005, p < 0.05). GSI was useful in visualizing hand and foot tendon anatomy and disorders. There were no statistical differences between GSI and MRI with regard to tendon thickening (χ2 = 0, p > 0.05), compression (χ2 = 0.5, p > 0.05), absence (χ2 = 0, p > 0.05) and rupture (χ2 = 0, p > 0.05). GSI was significantly less sensitive than MRI in displaying tendon adhesion (χ2 = 4.17, p < 0.05), degeneration (χ2 = 4.17, p < 0.05), and tendinous sheath disease (χ2 = 10.08, p < 0.05). Conclusion: GSI with monochromatic images at 65 keV displays clearly the most hand and foot tendon anatomy and disorders with image quality improved, as compared with conventional polychromatic images. It may be used solely or combined with MRI in clinical work, depending on individual patient disease condition.

Preparation of Poly{styene-co-4-(4-vinylphenoxy) phthalonitrile} Microspheres by a New Approach of “Co-Dissolution” and its Function Development

Qi Bian,Ke Zeng,Kai Qiu,Jiaojian Liu,Yancun Niu,Yancui Liu,Jianghuai Hu,Gang Yang 한국고분자학회 2015 Macromolecular Research Vol.23 No.7

Solid vinyl monomer with functional group “phthalonitrile” was successfully introduced into microspheres to make poly{styene-co-4-(4-vinylphenoxy) phthalonitrile} microspheres (PSPMs) with uniform (UPSPMs) and core-shell (core-shell PSPMs) structure using soap-free emulsion polymerization by the new approach of “codissolution”. The core-shell PSPMs then were used as the design platform to make metallophthalocyanine-containing microspheres. EA, FTIR, SEM, TEM, UV-vis, TGA, XPS, solid 1H NMR and XRD techniques were employed to analyze the formation and morphology of PSPMs and metallophthalocyanine-containing microspheres. The results showed that UPSPMs and core-shell PSPMs were both realized and they were regular sphericities with diameters of around 370 nm. The percentages of reacting weight of 4-(4-vinylphenoxy) phthalonitrile were close to 50%. Based on the design platform of core-shell PSPMs, metallophthalocyanine-containing microspheres could be obtained and the content of metallophthalocyanine was close to 19%.

Experimental Study on Mechanical Behavior of Prefabricated PEC Composite Beams Under Cyclic Loading

Kai Wu,Shi qi Lin,Xiaoyi Liu,Fanshen Mao,Jiangpeng Zhai 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.3

In this paper, a new type prefabricated partially encased composite beam (PEC beam) using screw arbors instead of stirrups or welded transverse links in ordinary PEC structures to connect the upper and lower steel fl ange has been proposed. It not only retains the performance advantages of PEC structures, but also greatly enhances the prefabricated degree of structure and simplifi es construction process. Twelve beams with and without screw arbors were tested under cyclic loading to study the mechanical behavior of this new type of PEC beams. The major factors considered were shear span ratio ( λ = 1.0, 2.0, 3.0 and 4.0), with or without screw arbors and concrete thickness. Test results including failure mode, load–defl ection curves ( P − Δ curves), characteristic points, ductility and stiff ness were introduced and discussed in detail. The test results showed that the failure mode of PEC beams changed from shear failure to bending failure with the increase of shear span ratio, and the asymmetric damage of specimens can be improved by screw arbors. In addition, PEC beams with screw arbors have better ductility and slower stiff ness degeneration than those without screw arbors. Potential application value can be seen from this new type of prefabricated PEC beams.

Effect of Vanadium on the Microstructure and Mechanical Properties of 2100 MPa Ultra-High Strength High Plasticity Spring Steel Processed by a Novel Online Rapid-Induction Heat Treatment

Qi‑Lei Dai,Kun Li,Kai‑Ren Meng,Zhou Fang,Wen Chen,Tian‑Bao Yang,Chi Feng,Jin‑Ming Wu,R. D. K. Misra 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.4

Advanced automotive industries generate large demand for the next generation of high strength and high toughness springsteels. Vanadium-containing 55SiCrV spring steels subjected to rapid-induction heating treatment can fulfil such requirements. However, the effect of vanadium microalloying under online rapid-induction heat treatments is rarely reported. Acomparative study of the microstructure and tensile properties of 55SiCr and 55SiCrV spring steel wires subjected to a novelonline rapid induction heat treatment has been demonstrated herein. It is found that the tensile strength of the 55SiCr springwire decreases with the decrease in the wire speed in online rapid-induction heating, and the plasticity increases. Whereas,the tensile strength of the 55SiCrV steel wire increases with the decrease in the wire speed with the retained high plasticity,which is attributed to the strengthening effect of the dislocations. Through the optimized rapid-induction heating/coolingthermal cycles and intermediate-temperature tempering treatment, the tensile strength of the 55SiCrV steel wire approaches2106 MPa with total elongation of 9.7%. Compared with the 55SiCr spring steel, the addition of V in 55SiCrV spring steelchanges the strengthening and toughening mechanisms via the grain refinement and enhancement in the hardenability andtempering resistance. The finely dispersed V-containing secondary phases are rarely found in the matrix, which indicates thatthe precipitation effect stemming from the addition of V is not the dominant strengthening factor in the online rapid-inductionheat process. The proposed novel online rapid-induction heat treatment provides a promising pathway for the mechanicalproperty improvement of the spring steel.

Anisotropy of magnetic susceptibility of the Late Cretaceous-Eocene sediments in the southeastern Fenwei Graben and its tectono-sedimentary significance

Kai Jiang,Guanzuo Wu,Guohao Si,Jiangang Li,Boyang Zheng,Qi Shen,Shida Song 한국지질과학협의회 2023 Geosciences Journal Vol.27 No.4

The Fenwei Graben located in the conjoint region between the Neo-Tethys tectonic domain and the western Pacific tectonic domain is key to understanding the tectonic evolution of the East Asian interior. Extensive Late Cretaceous–Paleogene fluvial and lacustrine deposits within the southeastern Fenwei Graben, provide ideal archives of early tectono-sedimentary evolution in Fenwei Graben. Recently, we find two complete Late Cretaceous–Cenozoic sections in the Lingbao Basin. These unique sections provide an excellent opportunity to investigate regional tectono-sedimentary evolution and its potential dynamic mechanisms in Fenwei Graben. The anisotropy of magnetic susceptibility (AMS) is an effective and economic method to obtain information about tectonic and/or sedimentary evolution recorded in deposits. To this end, we present an integrated rock magnetism and AMS study of 36 sampling sites from these two sections that span the interval from the Late Cretaceous to the Early Eocene. Our rock magnetism results suggest that hematite and magnetite are the main magnetic carriers of remanence, and paramagnetic minerals and hematite are major contributors to AMS in the Lingbao Basin. In addition, the reverse, intermediate and anomalous magnetic fabrics are found in these two sections, which may result from the contribution of iron-bearing carbonates in deposits. The AMS of the Lingbao Basin is a primary sedimentary fabric with the K1 direction antiparallel to the preferential paleocurrent direction. During the Paleocene, the clockwise rotation of the paleocurrent directions in both sections is more likely to be caused by the rotation of the Lingbao basin or the relatively rapid uplift of western provenance under the influence of the India–Eurasia convergence. Moreover, the inferred early evolution of the Fenwei Graben is likely controlled by both the western Pacific plate subduction and India–Eurasia convergence.

PbICl precursor solutions for all solid-state PbS quantum-dot sensitized TiO2 nanorod array solar cells using successive ionic layer adsorption and reaction method

Kai Lv,Chengwu Shi,Zhengguo Zhang,Chengfeng Ma,Qi Wang 한국물리학회 2018 Current Applied Physics Vol.18 No.6

In this work, PbICl precursor solution in N,N-dimethylformamide was successfully applied to deposit PbS quantum-dots on TiO2 nanorod arrays by successive ionic layer adsorption and reaction method (SILAR). The influence of PbI2, PbBr2, PbICl precursor solution on the morphology, crystal size and optical absorption of PbS quantum-dots was investigated and the photovoltaic performance of the corresponding solid-state PbS quantumdot sensitized TiO2 nanorod array solar cells with spiro-OMeTAD was evaluated. The average crystal sizes of PbS quantum-dots were 9.0 nm of PbI2, 8.6 nm of PbBr2 and 8.4 nm of PbICl and the photoelectric conversion efficiency of the corresponding solar cells achieved 2.63%, 3.00%, 3.45%. The result revealed that PbICl precursor solution was superior to PbBr2 and PbI2.

Rosa roxburghii Tratt juice inhibits NF-κB and increases IL-2 to alleviates the Foxp3-mediated Tregs imbalance in the peripheral blood of arseniasis patients

Qi Wang,Xiaolin Fang,Baofei Sun,Kai Zhu,Maolin Yao,Shaofeng Wei,Aihua Zhang 한국식품과학회 2024 Food Science and Biotechnology Vol.33 No.4

Arsenic can cause immune inflammation, which is the basis of arsenic-induced damage to multiple organs and systems. Forkhead box P3 (Foxp3)-labelled CD4+CD25+ regulatory T cells (Tregs) play an essential role in maintaining immune homeostasis. Nuclear factor-κb (NF-κB) and Interleukin-2 (IL-2) are critical regulators of Foxp3. Rosa roxburghii Tratt (RRT) is an edible medicinal plant with anti-inflammation effects. In this study, a control group (n = 41) and an arseniasis group (n = 209) were recruited, and screened subjects from the arseniasis patients for RRTJ (n = 46) or placebo (n = 43) to explore the possible mechanism by which RRT alleviates immune inflammation. The results indicated that RRTJ can inhibits NF-κB and increases IL-2, and alleviates the Foxp3-mediated Tregs imbalance in the peripheral blood of arseniasis patients. In summary, these findings suggest a novel intervention or therapeutic target for immune inflammation in arseniasis patients and provide new evidence that RRTJ inhibits immune inflammation.

Influence of Heat Treatment on Microstructure and Mechanical Properties of TC4 Fabricated by Laser Melting Deposition

Qi Chaoqi,Du Yang,Yang Ping,Liu Zhengwu,Lyu Hongya,Zhao Kai,Guo Lijie 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.12

The phase composition, microstructure, tensile properties of TC4 samples produced by laser melting deposition (LMD)and LMD followed by solution-aging treatment were investigated to explore a simpler approach to improve the mechanicalperformances and eliminate negative influences by post treatment. The as-deposited TC4 microstructure showed a combinationof α΄martensite and α-colony with various shapes, such as acicular, rod-like and lamellar. As a synergistic result ofsolution and aging treatment, the dispersion strengthening of secondary-α as well as optimization on length-width ratio ofprimary-α and volume fraction of β-phase cause an increase in the ductility and strength. Meanwhile, there is a differencebetween microstructure of water-quenched specimens and air-cooled specimens, subsequently playing a key role in properties. The solution with air-cooling and aging is comparatively found to significantly reduce the anisotropy and improvecomprehensive performance.