Self-mixing gas leakage detection of tank based on Er3þ eYb3þ codoped Distributed Bragg Reflector fiber laser

Wenhua Zhang,Rong Xiang,Shuang Wu,Bo Yang,Yu Liu,Jun Zhu,Huaqiao Gui,Jianguo Liu,Liang Lu,Benli Yu 한국물리학회 2014 Current Applied Physics Vol.14 No.5

In this paper we present a novel method of gas leakage detection based on self-mixing interference with an extremely compact Er3þ eYb3þ codoped Distributed Bragg Reflector (EYDBR) fiber laser. According to the simulation and theoretical analysis of gas leakage of tank, we infer that the vibration frequency peak of tank caused by gas leakage increases with the internal pressure. In the experiment, the results agree with the theoretical prediction and the relevance of polynomial fitting about the spectrum peak of tank vibration and internal pressure is 0.99725. Thus, we can get the internal pressure of tank by measuring the vibration frequency peak of tank. Moreover, it has important significance in the prevention of the accident of flammable or explosive gas leakage.

Research on Enhancing the Corrosion Resistance of Concrete In a MgSO 4 Corrosive Environment Using CTF Synergist

Xi Wang,Hongxia Qiao,Yunsheng Zhang,Wenhua Zhang,Cuizhen Xue,Mubita Majory Mundia,Lei Zhang 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.4

Concrete structure is easy to be damaged by corrosion in natural environment. In order to find a new way to improve the corrosion resistance of concrete. In this paper, the effect of Coal Tar Fuel (CTF) synergist on the corrosion resistance of concrete was analyzed by using MgSO4solution with concentration of 5% as corrosion medium. The change rule of concrete pore structure was studied. And the performance of concrete interfacial transition zone (ITZ) is studied. Finally, the effect of CTF synergist on hydration reaction of cementitious materials was revealed. The results show that the addition of 0.7% CTF synergist can significantly enhance the corrosion resistance of concrete, even with 10% reduction in cement dosage. After 28 days of being cured under this dosage, there is 13.54% increase in the proportion of pores with a diameter less than 100 μm and a 5.36% decrease in the proportion of pores with a diameter greater than 600 μm. Meanwhile, the microhardness of ITZ increases by 41.14%, while the width of ITZ decreases by 12.5%. Additionally, there is a reduction in the maximum crack width at the interface between ITZ and aggregate by 1.8 μm. The exothermic reaction of the cementitious material during hydration is more pronounced when the hydration time exceeds one hour.

Flavonoids extracted from Linaria vulgaris protect against hyperlipidemia and hepatic steatosis induced by western-type diet in mice

Wenhua Kuang,Xu Zhang,Zhou Lan 대한약학회 2018 Archives of Pharmacal Research Vol.41 No.12

Previous studies have shown that flavonoids (Fs) present in Linaria vulgaris inhibit lipid accumulation in vitro. This study was designed to evaluate the effects of Fs extracted from Linaria vulgaris ssp. sinensis (Bebeaux) Hong, on hyperlipidemia and hepatic steatosis induced by a western-type diet in mice. The major constituents of Fs were analyzed by LC–MS analysis. C57BL/6 mice were fed a western-type diet for 8 weeks to induce hyperlipidemia (model group), or fed a western-type diet followed by Fs treatment (90, 30 or 10 mg/kg/day) or atorvastatin treatment (1.0 mg/kg/day), for 8 weeks. It was found that Fs treatment resulted in significant reductions in serum levels of AST, ALT, TC, TG, LDL-C, free fatty acid and hepatic TC, and TG compared to those in model mice with hyperlipidemia (P < 0.05). The mice treated with Fs showed a relatively normal hepatic architecture compared to the hepatic steatosis shown in the model group. Moreover, the expressions of mature forms of sterol regulatory element–binding proteins (nuclear form of srebps, n-SREBPs) and 3-hydroxy-3-methylglutaryl coenzyme reductase (HMGCR) involved in lipid metabolism, were suppressed in the Fs-treated groups. Taken together, these results suggest Fs exert protective effects against hyperlipidemia and hepatic steatosis, which may involve the inhibition of mature SREBPs expressions.

Influence of Initial Moisture and Reactive MgO Content on Mechanical and Microstructural Characteristics of Carbonated Reactive Magnesia Treated Soft Clay

Wenhua Liu,Guoqian Hong,Wugang Li,Yi Zhang,Yang Sun 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.5

Soft clay presents many problems in the construction of infrastructures, which can be well solved by using effective solidification materials and technologies. The carbonated reactive magnesia (CRM) comes to the fore for its superiority in energy-saving and high solidification efficiency. Nevertheless, research on the applicability of CRM in soft clay solidifying is limited. In the current study, two major factors, including initial moisture content (w0) and reactive MgO content (Cm), were examined by measuring the unconfined compressive strength (UCS), mass and volume variations, and moisture content variation of CRM-treated soft clay. The intrinsic mechanisms were discussed based on the mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM), and X-ray diffraction (XRD) tests. The findings reveal that carbonated specimens with low Cm (≤ 25%) or w0 (≤ 25%) suffer from severe volumetric expansion and cracks, which cause serious reductions in UCS, and the strength of these specimens can be even much lower than that of the uncarbonated ones. Specimens with high Cm and w0 acquire satisfactory strength by carbonation, and the highest UCS can exceed 4 MPa, indicating that the CRM is capable of solidifying soft clay. Water and MgO are both vital for the crystallization of hydrated magnesium carbonates (HMCs), and Cm is also beneficial for restricting volumetric expansion and reducing macropores; while proper w0 is required for the formation and evolution of HMCs, especially the nesquehonite.

Characteristics of 'Hongrou Taoye', a Grafted Chimera in Sweet Orange and Satsuma Mandarin

Zhang, Min,Xie, Zongzhou,Deng, Xiuxin,Liao, Shengcai,Song, Wenhua,Tan, Yong Korean Society of Horticultural Science 2015 원예과학기술지 Vol.33 No.3

The synthesis of chimeras is a breeding approach for horticultural crops. In our breeding program, a new diploid citrus chimera, named 'Hongrou Taoye' (Citrus sinensis [L.] Osbeck + Citrus unshiu Marc.), was found arising at the junction where a 'Taoye' sweet orange (C. sinensis) scion was grafted onto Satsuma mandarin (C. unshiu). As an artificial chimera, its fruit traits derived from the L1 cell layer, with juice color and carotenoid complement, in which ${\beta}$-cryptoxanthin accumulated predominantly, similar to those of Satsuma mandarin. By contrast, traits originating from the L2/L3 cell layer, including pollen, seed, and rind aroma characteristics, were the same as those of 'Taoye' sweet orange (the scion). SSR and cpSSR analyses showed that both nuclear and chloroplast genomes of the chimera were a combination of both donor parents. 'Hongrou Taoye' thus combined the valuable traits of both donor plants, and therefore has good potential in citrus fresh market.

CNN-based Skip-Gram Method for Improving Classification Accuracy of Chinese Text

( Wenhua Xu ),( Hao Huang ),( Jie Zhang ),( Hao Gu ),( Jie Yang ),( Guan Gui ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.12

Text classification is one of the fundamental techniques in natural language processing. Numerous studies are based on text classification, such as news subject classification, question answering system classification, and movie review classification. Traditional text classification methods are used to extract features and then classify them. However, traditional methods are too complex to operate, and their accuracy is not sufficiently high. Recently, convolutional neural network (CNN) based one-hot method has been proposed in text classification to solve this problem. In this paper, we propose an improved method using CNN based skip-gram method for Chinese text classification and it conducts in Sogou news corpus. Experimental results indicate that CNN with the skip-gram model performs more efficiently than CNN-based one-hot method.

L2-gain Analysis and Synthesis of Saturated Switched Linear Systems

Xinquan Zhang,Wenhua Tao,Qingyu Su 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.11

The problem of L2-gain analysis and anti-windup compensators design is investigated for saturated switched linear systems via the single Lyapunov function method. Firstly, a sufficient condition about tolerable disturbances is obtained, under which the state trajectory starting from the origin will remain inside a bounded set. Then over this set of tolerable disturbances, we obtain the upper bound of the restricted L2-gain. Furthermore, the anti-windup compensation gains and the switched law, which aim to determine the maximum disturbance tolerance capability and the minimum upper bound of the restricted L2-gain, are presented by solving constraint optimization problem. Finally we give a numerical example to demonstrate the effectiveness of the proposed method.

Characteristics of ‘Hongrou Taoye’, a Grafted Chimera in Sweet Orange and Satsuma Mandarin

Min Zhang,Zongzhou Xie,Xiuxin Deng,Shengcai Liao,Wenhua Song,Yong Tan 한국원예학회 2015 원예과학기술지 Vol.33 No.3

The synthesis of chimeras is a breeding approach for horticultural crops. In our breeding program, a new diploid citrus chimera, named ‘Hongrou Taoye’ (Citrus sinensis [L.] Osbeck + Citrus unshiu Marc.), was found arising at the junction where a ‘Taoye’ sweet orange (C. sinensis) scion was grafted onto Satsuma mandarin (C. unshiu). As an artificial chimera, its fruit traits derived from the L1 cell layer, with juice color and carotenoid complement, in which β-cryptoxanthin accumulated predominantly, similar to those of Satsuma mandarin. By contrast, traits originating from the L2/L3 cell layer, including pollen, seed, and rind aroma characteristics, were the same as those of ‘Taoye’ sweet orange (the scion). SSR and cpSSR analyses showed that both nuclear and chloroplast genomes of the chimera were a combination of both donor parents. ‘Hongrou Taoye’ thus combined the valuable traits of both donor plants, and therefore has good potential in citrus fresh market.

Host factor TNK2 is required for influenza virus infection

Zhou Ao,Zhang Wenhua,Wang Baoxin 한국유전학회 2023 Genes & Genomics Vol.45 No.6

Background Host factors are required for Influenza virus infection and have great potential to become antiviral target. Objective Here we demonstrate the role of TNK2 in influenza virus infection. CRISPR/Cas9 induced TNK2 deletion in A549 cells. Methods CRISPR/Cas9-mediated deletion of TNK2. Western blotting and qPCR was used to measure the expression of TNK2 and other proteins. Results CRISPR/Cas9-mediated deletion of TNK2 decreased the replication of influenza virus and significantly inhibited the ex-pression of viral proteins and TNK2 inhibitors (XMD8-87 and AIM-100) reduced the expression of influenza M2, while over-expression of TNK2 weakened the resistance of TNK2-knockout cells to influenza virus infection. Furthermore, a decrease of nuclear import of IAV in the infected TNK2 mutant cells was observed in 3 h post-infection. Interestingly, TNK2 deletion enhanced the colocalization of LC3 with autophagic receptor p62 and led to the attenuation of influenza virus-caused accumulation of autophagosomes in TNK2 mutant cells. Further, confocal microscopy visualization result showed that influenza viral matrix 2 (M2) was colocalized with Lamp1 in the infected TNK2 mutant cells in early infection, while almost no colocalization between M2 and Lamp1 was observed in IAV-infected wild-type cells. Moreover, TNK2 depletion also affected the trafficking of early endosome and the movement of influenza viral NP and M2. Conclusion Our results identified TNK2 as a critical host factor for influenza viral M2 protein trafficking, suggesting that TNK2 will be an attractive target for the development of antivirals therapeutics.

Influence of Initial Damage Degree on the Degradation of Concrete Under Sulfate Attack and Wetting–Drying Cycles

Yujing Lv,Wenhua Zhang,Fan Wu,Huang Li,Yunsheng Zhang,Guodong Xu 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.5

The previous researches on the degradation process of concrete under sulfate attack mainly focus on non-damaged concrete. It may lead to an excessive evaluation of the durability of the structure, which is detrimental to the safety of the structure. In this paper, three different damage degrees of concrete specimens with non-damaged (D0) and initial damage of 10% (D₁) and 20% (D₂) were prefabricated and subjected to sulfate attack and wetting–drying cycles. With the increase of sulfate attack cycles (0, 30, 60, 90, 120, 150 cycles), the changes in mass loss, relative dynamic modulus of elasticity, and the stress–strain curve were studied. The results show that the mass of the D0 specimen had been increasing continuously before 150 sulfate attack cycles. The mass of D₁ and D₂ had been increasing before 60 cycles, and decreasing after 60 cycles. At 150 cycles, the mass loss of D0, D₁, D₂ were − 1.054%, 0.29% and 3.20%, respectively. The relative dynamic modulus of elasticity (RDME) of D0 specimen increases continuously before 90 sulfate attack cycles. After 90 cycles, the RDME gradually decreases. However, for D₁ and D₂ specimens, the RDME began to decrease after 30 cycles. The damage degree has an obvious influence on the compressive strength and elastic modulus. For the D0 specimen, the compressive strength and elastic modulus increased continuously before 90 cycles and decreased after 90 cycles. The compressive strength and elastic modulus of D₁ and D₂ specimens began to decrease after 30 cycles. The stress–strain curves of concrete with different initial damage degrees were established, and the fitting results were good. Finally, based on the analysis of experimental data, the degradation mechanism of concrete with initial damage under the sulfate wetting–drying cycle was discussed.