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Ximei Zhai,Yonghui Wang,Heng Wang 한국강구조학회 2017 International Journal of Steel Structures Vol.17 No.3
With the growing demand of energy for recent decades, liquefied natural gas (LNG) has become one of the most significant energy sources due to the high calorific value and performances, as well as the ease of transportation and storage. Hence, many LNG tanks have been constructed to store liquefied nature gas and the roof of a LNG tank consists of reticulated shell, roof panel and concrete dome. The ribbed-type reticulated shell welded to the roof panel, which is called roof panel enhanced (RPE) reticulated shell in this paper, can be treated as the template during concrete dome casting. In addition, it also sustains the gravity load of concrete dome before concrete hardening and works together with concrete dome as a composite structure after concrete hardening. It is of significance to study the response of RPE reticulated shell during the construction stage. In the first part of this paper, the nonlinear load–deflection complete process analysis was carried out to study the buckling behavior of the RPE reticulated shell under uniformly distributed load. The effects of beam section size, rise-to-span ratio and the initial geometric imperfection magnitude on the buckling resistance of the RPE reticulated shell were investigated to optimize the current design. In the second part of this paper, the buckling behavior of the RPE reticulated shell under non-uniformly distributed load induced by concrete dome casting was studied and the air pressures of each construction step were determined by considering the response behaviors of the time-varying structures composed of RPE reticulated shell, concrete dome and changing load. The safety factors of the RPE reticulated shell were calculated under the appropriate air pressure and initial geometric imperfections, based on which, the original optimized design of the RPE reticulated shell was improved to reduce the material consumption.
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Evaluation on Nutritional Value of Field Crickets as a Poultry Feedstuff
Wang, Dun,Zhai, Shao Wei,Zhang, Chuan Xi,Bai, Yao Yu,An, Shi Heng,Xu, Ying Nan Asian Australasian Association of Animal Productio 2005 Animal Bioscience Vol.18 No.5
The proximate analysis, amino acid content and true amino acid digestibility and TMEn for poultry of adult Field crickets Gryllus testaceus Walker, were investigated. The insect was also used as partial replacement of protein supplements in the broiler diet on an equal CP percentage and TMEn basis. The results indicated that the adult insect contained: crude protein 58.3%; fat 10.3%, chitin 8.7% and ash 2.96% on dry matter basis, respectively. The total amounts of methionine, cystine and lysine in the Field crickets were 1.93%, 1.01% and 4.79%, respectively, and their true digestibility coefficients, determined in cecectomized roosters, were 94.1%, 85% and 96%, respectively. The TMEn of this insect meal was 2,960 kcal/kg determined in cecectomized roosters. When cornsoybean meal diets were formulated on an equal CP percentage and TMEn basis, up to 15% Field cricket could replace control diet without any adverse affects on broiler weight gain, feed intake or gain:feed ratio from 8 to 20 d posthatching.
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Evidence for the Presence of Long-Lived Plasma Cells in Nasal Polyps
Ya-Na Zhang,Jia Song,Guan-Ting Zhai,Hai Wang,Ren-Zhong Luo,Jing-Xian Li,Bo Liao,Jin Ma,Heng Wang,Xiang Lu,Da-Bo Liu,Zheng Liu 대한천식알레르기학회 2020 Allergy, Asthma & Immunology Research Vol.12 No.2
Purpose: Plasma cells and immunoglobulins (Igs) play a pivotal role in the induction and maintenance of chronic inflammation in nasal polyps. During secondary immune responses, plasma cell survival and Ig production are regulated by the local environment. The purpose of the present study was to investigate the presence of long-lived plasma cells (LLPCs) and specific survival niches for LLPCs in human nasal polyps. Methods: Nasal mucosal samples were cultured with an air-liquid interface system and the Ig levels in culture supernatants were analyzed by enzyme-linked immunosorbent assay. The characteristics of LLPCs in nasal polyps were determined by immunohistochemistry and immunofluorescence. The expression of neurotrophins as well as their receptors was detected by quantitative real-time polymerase chain reaction, immunohistochemistry, immunofluorescence, and Western blotting. Results: The numbers of CD138+ total plasma cells and BCL2+ plasma cells were increased in both eosinophilic and non-eosinophilic nasal polyps compared with those in normal tissues. The production of IgG, IgA, and IgE was detected in culture supernatants even after a 32-day culture of nasal polyps. Although the total numbers of plasma cells were decreased in nasal polyps after culture, the numbers of BCL2+ plasma cells remained stable. The expression of nerve growth factor (NGF) as well as tropomyosin receptor kinase (Trk) A, a high-affinity receptor for NGF, was upregulated in both eosinophilic and non-eosinophilic nasal polyps. In addition, BCL2+ plasma cell numbers were positively correlated with NGF and TrkA mRNA expression in nasal mucosal tissues. Polyp plasma cells had the expression of TrkA. Conclusions: Human nasal polyps harbor a population of LLPCs and NGF may be involved in their prolonged survival. LLPCs may be a novel therapeutic target for suppressing the local Ig production in nasal polyps.
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Effect of pH on the fibroin regulated mineralization of calcium phosphate
Xiao-Dan Sun,Ying-Li Zhou,Juan-Yong Ren,Fu-Zhai Cui,Heng-De Li 한국물리학회 2007 Current Applied Physics Vol.7 No.s1
The eect of pH on the mineralization of calcium phosphate regulated by broin is investigated in this paper. Calcium phosphatesform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results dem-onstrated the great inuence of pH on the formation of calcium phosphate, both in the presence and in the absence of broin. Purehydroxyapatite (Ca10(PO4)6(OH)2,HA) can be obtained at relatively high pH (pH 8.0), while brushite (CaHPO4 Æ2H2O, DCPD) isto HA and regulate the morphology and structure of the HA crystals obtained.
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Corrosion behavior of biodegradable magnesium alloy by MAF treatment
Xinzhe Gao,Yifan Yang,Bi Ying Shi,Chun Yu Dai,ChuanYao Zhai,Bing Cheng Zhao,Heng Bo Jiang 대한치과재료학회 2021 대한치과기재학회 학술대회 Vol.2021 No.4
Introduction. Magnesium and magnesium alloys, with mismatched degradation rates and products that are expected to support the effects being issues that need to be overcome, are hindered from clinical application. The coating preparation plays an active role in tackling this problem. The purpose of this work is to observe the corrosion control by the MAF coating in vitro and in vivo. Method. The MgF2 layer was prepared on the surface of AZ31 magnesium alloy by MAF method at 190 V DC in HF·H<sub>2</sub>O (46%) solution. The magnesium alloy samples before and after the treatment were compared by scanning electron microscopy (SEM) observation. The coating structure and constituents were confirmed using cross-sectional SEM, energy-dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) analysis. Potentiodynamic polarization (PDP) was utilized for electrochemical evaluation of corrosion potential and current density. 6-week-old male rats were used as experimental subjects for in vivo experiments. The volume changes and surface morphology of the corroded samples were dynamically monitored using micro-CT for 16 weeks. Results. The distribution of coating elements observed by EDS is dominated by magnesium and fluorine. The XRD analysis shows that the prepared coatings are mainly MgF2 crystals. The coating was observed by SEM to be uniformly dense and coral-like. The results of the PDP experiments showed that the coated samples had lower corrosion current density and corrosion potential. Comparison of the two groups of in vivo experiments revealed that the rate of volume change decreased in the coated samples and the density change during micro-CT observation was less than that of the uncoated group. Conclusions. Effective coatings were prepared on the surface of AZ31 magnesium alloy using the MAF method. This coating was also validated the potential to control the corrosion rate and corrosion process of magnesium alloy by both in vitro and in vivo evaluation systems.
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