Experimental Studies on Progressive Collapse Behavior of RC Frame Structures: Advances and Future Needs

Wei?Jian Yi,Fan Yi,Yun Zhou 한국콘크리트학회 2021 International Journal of Concrete Structures and M Vol.15 No.4

In the recent two decades, the progressive collapse of reinforced concrete (RC) frame structures attracted unprecedented research interests in the structural engineering community. Experiments are regarded as an essential method in this field since actual cases can barely provide sufficient and effective data to support rigorous research. In this paper, prevailing experimental assumptions and configurations among over 100 series of experiments are quantitatively revealed by a bibliometric collection based on systematic search in an academic database. Since numerous experiments have been reported on the progressive collapse of RC frame structures, this paper subsequently presents a state-of-the-art review summarizing both experimental consensuses and controversies constituted by three main aspects: (a) static mechanisms, (b) dynamic behavior, and (c) threat-dependent research. The significance of secondary mechanisms, existing problems of dynamic effects, and potential flaws of the threat-independent assumption are discussed in detail with experimental findings. Future needs are emphasized on research targets, correlations between experiments and design, dynamic effects, threat-dependent issues, and retrofitting. These recommendations might help researchers or designers realize a more reliable and realistic progressive collapse design of RC frame structures in the future.

The Religious Belief of Chinese Yi People Embodied in Bimo Culture

웨이이 ( Wei Yi ) 한국동양예술학회 2020 동양예술 Vol.49 No.-

이 논문은 중국 이족 집단에 대한 종교 신앙 체계의 변천과 재구성의 단초인 原初性과 再生性을 연구한다. 이족의 문화는 비교적 안정된 전통을 가지고 있으면서도 시대와 지역, 장르별로 차이가 있다. 이 논문에서 언급하고자 하는 변화는 정상적인 역사와 문화의 법칙 속에서 발전한 것으로, 예를 들어 물과 같은 재생적인 성질을 통해 얻을 수 있는 자연의 생리변화의 이치와 상통하는 점이 있다. 한 지역의 문화도 전승에서 재구성되는 것이 자연의 섭리이자, 이족문화의 종교 신앙 체계 역시 그 예라 할 수 있겠다. 이족의 종교는 지역과 교통이 발달하지 않은 이유로 역사적으로는 비교적 안정된 집단적 형태를 지녔지만, 이러한 안정된 집단 형태도 끊임없이 자기변화와 외래 문화 흡수를 통해 이족 고유의 색채를 보완해 왔다. 따라서 이 논문은 중국 이족의 전통인 畢摩文化에 대한 연구를 통해 이족의 종교문화를 이론적으로 정확하게 인식할 수 있도록 도와주고, 소수민족 문화의 가치를 이해하게 해준다. Through exploration of the memory of Chinese Yi ethnic group, this paper expounds the change and reconstruction of Yi religious belief system from the historical dimension, and studies its "primitive" and "regenerative" natures. Yi culture has its stable tradition, and shows different changes in different times, geographies and scenarios. The author believes that the above changes occur and develop in a normal historical and cultural frame. A "regenerative" evolution also exists, which is similar to the source of water. If no fresh water pours in, it cannot form a river, and may even dry up. All cultures regenerate and reconstruct themselves according to natural law, and the religious belief system in Yi culture is of no exception, and such changes and reconstruction are consistent with the living practice of ethnic groups. Due to geographical and traffic reasons, Yi religious belief remains steady in its form in history, but it is also gradually improved during continuous self-transformation and absorption of foreign culture. Through study of traditional Bimo culture of Yi people in China, this paper can help readers to understand Yi religious culture and its values from a theoretical perspective.

Anti-Inflammatory Effects of Naringin in Chronic Pulmonary Neutrophilic Inflammation in Cigarette Smoke-Exposed Rats

Yi-Chu Nie,Hao Wu,Pei-Bo Li,Yu-Long Luo,Kang Long,Li-Ming Xie,Jian-Gang Shen,Wei-Wei Su 한국식품영양과학회 2012 Journal of medicinal food Vol.15 No.10

Naringin, a well-known flavanone glycoside of grapefruit and citrus fruits, was found to be as an effective anti-inflammatory compound in our previous lipopolysaccharide-induced acute lung injury mouse model via blockading activity of nuclear factor κB. The current study sought to explore the anti-inflammatory effects of naringin on chronic pulmonary neutrophilic inflammation in cigarette smoke (CS)-induced rats. Seventy Sprague-Dawley rats were randomly divided into seven groups to study the effects of CS with or without various concentrations of naringin or saline for 8 weeks. The results revealed that naringin supplementation at 20, 40, and 80 mg/kg significantly increased body weight of CS-induced rats as compared to that in the CS group. Moreover, naringin of 20, 40, and 80 mg/kg prevented CS-induced infiltration of neutrophils and activation of myeloperoxidase and matrix metalloproteinase-9, in parallel with suppression of the release of cytokines, such as tumor necrosis factor-α and interleukin-8 (IL-8). IL-10 in bronchoalveolar lavage fluid was significantly suppressed after CS exposure, but dose dependently elevated by naringin. The results from hematoxylin and eosin staining revealed that naringin dose dependently reduced CS-induced infiltration of inflammatory cells, thickening of the bronchial wall, and expansion of average alveolar airspace. In conclusion, our data suggest that naringin is an effective anti-inflammatory compound for attenuating chronic pulmonary neutrophilic inflammation in CS-induced rats.

The K+/H+ antiporter AhNHX1 improved tobacco tolerance to NaCl stress by enhancing K+ retention

Wei-Wei Zhang,Jing-Jing Meng,Jin-Yi Xing,Sha Yang,Feng Guo,Xin-Guo Li,Shu-Bo Wan 한국식물학회 2017 Journal of Plant Biology Vol.60 No.3

High salinity is the one of important factors limiting plant growth and crop production. Many NHX-type antiporters have been reported to catalyze K+/H+ exchange to mediate salt stress. This study shows that an NHX gene from Arachis hypogaea L. has an important role in K+ uptake and transport, which affects K+ accumulation and plant salt tolerance. When overexpressing AhNHX1, the growth of tobacco seedlings is improved with longer roots and a higher fresh weight than the wild type (WT) under NaCl treatment. Meanwhile, when exposed to NaCl stress, the transgenic seedlings had higher K+/H+ antiporter activity and their roots got more K+ uptake. NaCl stress could induce higher K+ accumulation in the roots, stems, and leaves of transgenic tobacco seedlings but not Na+ accumulation, thus, leading to a higher K+/Na+ ratio in the transgenic seedlings. Additionally, the AKT1, HAK1, SKOR, and KEA genes, which are involved in K+ uptake or transport, were induced by NaCl stress and kept higher expression levels in transgenic seedlings than in WT seedlings. The H+-ATPase and H+-PPase activities were also higher in transgenic seedlings than in the WT seedlings under NaCl stress. Simultaneously, overexpression of AhNHX1 increased the relative distribution of K+ in the aerial parts of the seedlings under NaCl stress. These results showed that AhNHX1 catalyzed the K+/H+ antiporter and enhanced tobacco tolerance to salt stress by increasing K+ uptake and transport.

TC1 (C8orf4) is involved in ERK1/2 pathway-regulated G1-to S-phase transition

( Yi Dong Wang ),( Guo Hui Bian ),( Xiao Yan Lv ),( Rong Zheng ),( Huan Sun ),( Zheng Zhang ),( Ye Chen ),( Qin Wei Li ),( Yan Xiao ),( Qiu Tan Yang ),( Jian Zhong Ai ),( Yu Quan Wei ),( Qin Zhou ) 생화학분자생물학회 2008 BMB Reports Vol.41 No.10

Research on the Choice of Knowledge Trading Pattern among Enterprises in Online Innovation Environment

Yi Li,Yuanjie Ni,Wei Liu,Wenxing Yan 보안공학연구지원센터(IJUNESST) 2015 International Journal of u- and e- Service, Scienc Vol.8 No.1

In the network innovation environment, the knowledge trading between enterprises could be divided into traditional pattern (TP) and the E-commerce pattern (ECP). The two both have their advantages and disadvantages, so enterprises would face the problem. This paper generalizes the operation characteristics and the influence factors of two patterns. The mathematical model is used to analyze the selection mechanism of choosing two patterns, and the result illustrated that when the agency fee, the risk cost of ECP and the trading potential get bigger, the possibility that enterprises choose TP would get bigger, too; and when the explicitness of knowledge, cost of searching, trading incentive, the risk cost of TP and the reserve cost of ECP increase, the possibility that enterprises choose ECP would increase. When the reserve cost of ECP becomes big enough, it would make enterprises be more willing to choose hybrid pattern.

Enhanced low-temperature activity and huimid-SO2 resistance of MnFe-based multi-oxide catalysts for the marine NH3-SCR reaction

Yi Wei,Wenhua Li,Qi Wang,Mengyu Liu,Peiyuan Liang,Lina Wang,Tianjun Sun 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.123 No.-

Several MnFe-based multi-metal oxides were synthesized as NH3-SCR catalysts by a simple coprecipitationmethod for abating NOx of marine diesel exhausts. The Co and Nb-doped MnFeCeAl catalysts exhibitNOx conversion over 90% and N2 selectivity above 95% at 180–270 C, especially the MnFeCeAlCo catalystscan inhibit nearly all sulfate species growth within 150 ppm humid-SO2 gases at 225 C. The structuralcharacterization results revealed that Co, Nb, Sm, and Sb doping can enhance interactions amongdifferent components and promote active component dispersion. Temperature programmed analysisindicated that the Co doping is not only more favorable for improving redox properties, but can alsoenhance the surface acidity, which are advantageous to improve the activity, N2 selectivity, andhumid-SO2 resistance. Moreover, the XPS results implied that the binding energy shift or the valence variationof the Sm, Sb, Nb, and Co species on catalyst surfaces are favored to raise the atomic ratios of highvalentMn species and surface adsorbed oxygen, which can promote the redox property significantly andfurther facilitate SCR activity. Accordingly, the excellent activity and humid-SO2 tolerance of theMnFeCeAlCo catalyst should attribute to its lower redox temperature, strong interaction between oxides,47.3% surface Mn4+/Mn3+ species, and 71.8% adsorbed oxygen, which provide a method for improving theSCR performances of MnFe-based catalysts with humid SO2 resistance.

China`s Role in Dealing with the North Korean Nuclear Issue

Yi Wei Wang 한국학술연구원 2005 Korea Observer Vol.36 No.3

SDSS J013127.34-032100.1: A NEWLY DISCOVERED RADIO-LOUD QUASAR AT <i>z</i> = 5.18 WITH EXTREMELY HIGH LUMINOSITY

Yi, Wei-Min,Wang, Feige,Wu, Xue-Bing,Yang, Jinyi,Bai, Jin-Ming,Fan, Xiaohui,Brandt, William N.,Ho, Luis C.,Zuo, Wenwen,Kim, Minjin,Wang, Ran,Yang, Qian,Zhang, Ju-jia,Wang, Fang,Wang, Jian-Guo,Ai, Yanl IOP Publishing 2014 ASTROPHYSICAL JOURNAL LETTERS - Vol.795 No.2

<P>Very few of the z > 5 quasars discovered to date have been radio-loud, with radio-to-optical flux ratios (radio-loudness parameters) higher than 10. Here we report the discovery of an optically luminous radio-loud quasar, SDSS J013127.34-032100.1 (J0131-0321 in short), at z = 5.18 +/- 0.01 using the Lijiang 2.4 m and Magellan telescopes. J0131-0321 has a spectral energy distribution consistent with that of radio-loud quasars. With an i-band magnitude of 18.47 and a radio flux density of 33 mJy, its radio-loudness parameter is similar to 100. The optical and near-infrared spectra taken by Magellan enable us to estimate its bolometric luminosity to be L-bol similar to 1.1 x 10(48) erg s(-1), approximately 4.5 times greater than that of the most distant quasar known to date. The black hole mass of J0131-0321 is estimated to be 2.7 x 10(9) M-circle dot, with an uncertainty up to 0.4 dex. Detailed physical properties of this high-redshift, radio-loud, potentially super-Eddington quasar can be probed in the future with more dedicated and intensive follow-up observations using multi-wavelength facilities.</P>

Design of Single-Phase Electrical Spring Based on PR Controller and Critical Load Current Feedback

Wei Yi,Zhao ChaoHui,Duan YuBin 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.6

According to the characteristics of fast and accurate voltage regulation of single-phase electrical spring (ES), a critical load current feedback control strategy considering grid voltage is proposed. Taking pure resistive loads as an example, the S-domain mathematical model of ES is established. Based on this, the design method is described in detail. Aiming at the voltage fl uctuation of power grid aff ects the regulation precision of ES, the feedforward control of grid voltage is proposed. Through the equivalent transformation of control block diagrams, the feedforward transfer function of grid voltage which can eff ectively eliminate the infl uences of grid voltage on the regulation precision of ES is deduced. Finally, the eff ectiveness and correctness of the proposed control method is verifi ed by experiments