Experimental Study on Shear Transfer Performance of Uncracked Monolithic Steel Fiber Concrete

Qing Zhi,Jingang Xiong,Wenjie Yang,Sha Liu 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.12

Shear transfer performance at interface of steel fiber reinforced concrete (SFRC) is of great importance that many factors influence the shear transfer performance of SFRC such as concrete strength and aggregate interlock, reinforcement dowel action and steel fiber. Many studies have focused on part of the factors. The shear transfer performance of uncracked monolithic SFRC is studied in this paper by considering the combined effects of cohesion, clamping stress, confined stress, reinforcement, and steel fiber. Thus, this study presents a series of direct shear tests by Z-type push-off specimens. The direct shear strength, failure mode and failure process of plain SFRC and reinforced SFRC are studied, and their shear stress-slip and shear stress-crack width responses of the tested specimens are obtained. Test results showed that reinforcement and steel fibers can improve the ductile behavior and shear strength of the shear interface simultaneously. And shear stress-slip and –crack curves of the test specimens with those combined effects are strongly nonlinear. Finally, based on the existing shear strength calculation model and the test results of this paper, a shear transfer calculation formula of SFRC interface is proposed and verified according to the Mohr Coulomb failure criteria.

Bath Leisure

Qingzhi Hu 한국콘텐츠학회 2017 ICCC International Digital Design Invitation Exhib Vol.2017 No.8

Research on Model of Free Piston Linear Generator based on Location Domain and Real-Time Motion Control Strategy

Zhang Qingzhi,Lu Haifeng,Li Yongdong,Chai Jianyun 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

Free Piston Linear Generator (FPLG) is an ideal power resource in Hybrid Electric Vehicle (HEV) for its potential advantages of low friction loss, variable compression ratio, being suitable for various fuels, high thermal efficiency, etc. No FPLG has been successfully applied to an actual vehicle as lack of reliable control. The first part of this paper consists of introduction to FPLG and its research status. Structure and working principle of FPLG are analyzed in the second part. Then the thermodynamic process is analyzed and mathematical models of all kinds of FPLG using real-time motion control strategy based on location domain are established. After these, verifying work of the six different models established before and the realtime control strategy is carried out. Results show that the mathematical models of FPLG based on location domain work well and the control strategy effects with proper linear generator.

Selective surface functionalization at regions of high local curvature in graphene

Wu, Qingzhi,Wu, Yaping,Hao, Yufeng,Geng, Jianxin,Charlton, Matthew,Chen, Shanshan,Ren, Yujie,Ji, Hengxing,Li, Huifeng,Boukhvalov, Danil W.,Piner, Richard D.,Bielawski, Christopher W.,Ruoff, Rodney S. The Royal Society of Chemistry 2013 Chemical communications Vol.49 No.7

<P>Monolayer graphene was deposited on a Si wafer substrate decorated with SiO<SUB>2</SUB> nanoparticles (NPs) and then exposed to aryl radicals that were generated <I>in situ</I> from their diazonium precursors. Using micro-Raman mapping, the aryl radicals were found to selectively react with the regions of graphene that covered the NPs. The enhanced chemical reactivity was attributed to the increased strain energy induced by the local mechanical deformation of the graphene.</P> <P>Graphic Abstract</P><P>Due to the increased strain energy caused by local mechanical deformation, aryl radicals were found to selectively react with regions of graphene that were curved by underlying SiO<SUB>2</SUB> nanoparticles. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cc36747e'> </P>

汉代帝陵的考古发现与研究

谭青枝 ( Qingzhi Tan ) 동양미술사학회 2022 동양미술사학 Vol.14 No.-

近二十年, 汉代帝陵的考古调查勘探发掘工作取得了重大成果, 基本探明了两汉帝陵的形制、布局及发展演变轨迹。本文利用已发表的考古资料及多位学者的研究成果, 介绍了两汉帝陵考古工作及研究历程, 并重点介绍了具有代表性的陵墓布局、内涵。西汉“事死如生”,帝陵制度的特点可归纳如下:帝后同茔不同穴;双重陵园, 外陵园内帝后又各自有小陵园;陵园墙外有一重或两重围沟;覆斗形封土;墓葬形制是有四条墓道的亚字形墓, 以东墓道最长, 为主墓道;墓室内黄肠题凑木椁结构;墓主身着金镂玉衣;陵园内有大量的外藏坑, 有多座建筑, 有嫔妃祔葬墓, 数量从数座到数十座不等;陵园外有大量陪葬墓;西汉宣帝之前的帝陵近旁设置陵邑。东汉提倡薄葬, 与西汉时期重视陵墓设施相较, 更注重祭祀仪式, 东汉时期帝陵规模较西汉小很多, 特点如下:帝后同穴而葬;一重陵园, 规模较小;或有一重围沟;圆丘形封土;墓葬形制是一条墓道的甲字形墓, 墓道通常在墓室南侧;墓室是有横前室纵向后室或多室砖石墓;墓主身着金镂玉衣;陵园内有石殿建筑、钟虡建筑;没有外藏坑, 将西汉时期的外藏体系纳入墓葬内;有陪葬墓。 Abstract: In the past 20 years, great achievements have been made in the archaeological exploration and excavation of the mausoleums of the Han Dynasty, which has basically proved the shape, layout, and evolution of the mausoleums of the Han Dynasty. Based on the published archaeological materials and the research results of many scholars, this paper introduces the archaeological work and research process of the mausoleums of the Han Dynasty, and focuses on the layout and characteristics of the representative mausoleums. The idea of Han Dynasty is to treat the dead as if he were alive. The characteristics of the imperial mausoleums system in the Western Han Dynasty can be summarized as follows: The emperor and queen were buried in the same mausoleum, but in different tombs; double enclosure; in the outer enclosure, the emperor and the queen had their own small enclosure; There were one or two ditches outside the enclosure wall; the covering soil with truncated square cone; the shape of the mausoleum was a "亞" shaped tomb with four entrance passages, of which the East path was the longest and the main path; there was an outer coffin in the tomb, which was usually made of cypress with the timber headed in; the owner of the tomb was dressed in jade burial suit sewn with gold thread; in the enclosure, there were a large number of external burial pits, a number of buildings and burial tombs for concubines, ranging from several to dozens; outside the enclosure, there were a lot of funerary tombs; before Emperor Xuan of the Western Han Dynasty, a mausoleum feod was set up near the mausoleum. Compared with the Western Han Dynasty, which paid more attention to mausoleum facilities, the Eastern Han Dynasty advocated plain burial, and paid more attention to sacrificial rites. The mausoleum of the Eastern Han Dynasty was much smaller than that of the Western Han Dynasty, and its characteristics are as follows: the emperor and queen were buried in the same grave; one small enclosure; maybe there was one ditch outside the enclosure wall; the covering soil with dome shape; The shape of the tomb was a "甲" shaped tomb with one entrance passage, which was usually to the south of the chamber; brick chambered tombs, with transverse antechamber, longitudinal posterior chamber, or multiple chambers; the owner of the tomb was dressed in jade burial suit sewn with gold thread; there were stone building and building with hanging bells in the enclosure; there was no external burial pit, and the external burial facilities of the Western Han Dynasty were put inside the imperial mausoleum; There were accompanying tombs in the imperial mausoleum.

한대 황제릉의 고고학적 발견과 연구

탄칭즈 ( Qingzhi Tan ) 동양미술사학회 2022 동양미술사학 Vol.14 No.-

최근 20년 동안 한대 황제릉의 고고학적 조사·탐사 발굴 작업은 한대제릉의 형식과 배치, 발전 및 변화의 궤적을 밝혀내는데 성과를 거두었다. 이 글에서는 이미 발표된 고고학 자료와 여러 학자들의 연구성과를 기초로 한대 황제릉의 고고학적 성과와 연구과정을 소개하고, 능묘배치, 내포된 함의을 중점적으로 소개하였다. 서한(西漢)은 “사사여생(事死如生)” 즉, 죽은자 섬기기를 산자 섬기듯 하였는데, 황제릉제도의 특징을 요약하면, “제후동토부동혈(帝后同茔不同穴)”로, 황제와 황후는 동일 묘역에 장례를 치루지만, 각자의 능원을 가지며, 이중능원, 외릉원 안에서 제후는 각기 소능원을 가지며, 능원담장 밖에는 한겹 또는 2중으로 해자를 둘렀다. 복두형 봉분으로 4개의 묘도가 있는 아자형묘(亞字形墓)이며. 가장 긴 동쪽의 묘도가 무덤의 주묘도이다. 무덤 안은 황장제주의 목곽구조이며, 묘주는 금루옥의를 입고 있다. 능원 안에는 대량의 외장갱이 있고, 여러 기의 건축물이 있으며, 비빈의 합장묘가 있다. 수량은 몇기에서 수십기로 차등이 있다. 능원밖에는 대량의 배장묘(陪葬墓)가 있다. 서한 선제이전의 제릉은 근처에 능읍을 설치하였다. 동한(東漢)은 박장(薄葬)을 부르짖어, 서한시대의 능묘시설을 중시하였던 것과 비교된다. 제사의식을 더 중시하였으며, 동한시기 제릉의 규모가 서한 때 보다 훨씬 작다. 특징은 다음과 같다. 제후동혈장(帝后同穴葬)으로, 한겹의 능원으로 규모가 작거나 혹은 한 겹의 해자가 있거나 또는 원구형 봉분이다. 무덤형식은 묘도가 하나인 갑자형묘(甲字形墓)로, 묘도는 통상적으로 묘실의 남측에 있다. 묘실은 가로형 전실과 세로형 후실이 있거나 혹은 다실(多室)의 전석묘(磚石墓)이다. 묘주는 몸에 금루옥의를 걸치고 있다. 능원 안에는 석전(石殿)건축과 종거(鐘簴)건축이 있다. 외장갱이 없는 것은, 서한시기의 외장체계를 무덤 안으로 포함시켰으며, 배장묘는 있다. In the past 20 years, great achievements have been made in the archaeological exploration and excavation of the mausoleums of the Han Dynasty, which has basically proved the shape, layout, and evolution of the mausoleums of the Han Dynasty. Based on the published archaeological materials and the research results of many scholars, this paper introduces the archaeological work and research process of the mausoleums of the Han Dynasty, and focuses on the layout and characteristics of the representative mausoleums. The idea of Han Dynasty is to treat the dead as if he were alive. The characteristics of the imperial mausoleums system in the Western Han Dynasty can be summarized as follows: The emperor and queen were buried in the same mausoleum, but in different tombs; double enclosure; in the outer enclosure, the emperor and the queen had their own small enclosure; There were one or two ditches outside the enclosure wall; the covering soil with truncated square cone; the shape of the mausoleum was a "亞" shaped tomb with four entrance passages, of which the East path was the longest and the main path; there was an outer coffin in the tomb, which was usually made of cypress with the timber headed in; in the enclosure, there were a large number of external burial pits, a number of buildings and burial tombs for concubines, ranging from several to dozens; outside the enclosure, there were a lot of funerary tombs; before Emperor Xuan of the Western Han Dynasty, a mausoleum feod was set up near the mausoleum. The mausoleum of the Eastern Han Dynasty was much smaller than that of the Western Han Dynasty, and its characteristics are as follows: the emperor and queen were buried in the same grave; one small enclosure; maybe there was one ditch outside the enclosure wall; the covering soil with dome shape; The shape of the tomb was a "甲" shaped tomb with one entrance passage, which was usually to the south of the chamber; brick chambered tombs, with transverse antechamber, longitudinal posterior chamber, or multiple chambers; there were stone building and building with hanging bells in the enclosure; there was no external burial pit, and the external burial facilities of the Western Han Dynasty were put inside the imperial mausoleum; There were accompanying tombs in the imperial mausoleum.

Development, characterization, and inheritance of 113 novel EST-SSR markers in the Pacific oyster (Crassostrea gigas)

Qi Li,Qingzhi Wang,Mingjun Qi,Jianlong Ge,Rihao Cong 한국유전학회 2011 Genes & Genomics Vol.33 No.3

A total of 113 novel EST-derived simple sequence repeat (EST-SSR) markers were developed in the Pacific oyster (Crassotrea gigas). Polymorphisms of these markers were evaluated in a wild population of 30 individuals. The number of alleles per locus ranged from 2 to 27 with an average of 6.3, and the observed and expected heterozygosities varied from 0 to 0.9667 and from 0.0333 to 0.9701, respectively. Mendelian segregations were tested for 24 of the markers that were polymorphic in one family produced by single-pair mating. Null alleles were discovered at four loci. Nine tests of segregation ratios revealed significant departures from expected Mendelian ratios. As a useful addition to the collection of the microsatellites that are now available for C. gigas, these EST-SSR markers will help the advance in investigation of QTL mapping and genetic diversity in this species.

Enhanced filtration performance and anti-biofouling properties of antibacterial polyethersulfone membrane for fermentation broth concentration

Longbin Qi,Yunxia Hu,Qingzhi Chai,Qun Wang 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-

The anti-biofouling performance of silver nanoparticles (Ag NPs) modified polyethersulfone (PES)membrane was evaluated during the concentration of fermentation broth. The Ag NPs containingmembrane did not exhibit biofouling mitigation performance during thefirstfiltration cycle, but couldhelp to recover waterflux upon physical cleaning. After threefiltration-clean cycles, the Ag NPscontaining membranes presented higher waterflux and slowerflux decline than the control membraneswithout Ag NPs. Ag NPs on the membrane surface facilitated the effective removal of cake layer. Moreover, the Ag NPs-containing membrane had no negative effects on the activities of bacteria infermentation broth.

Stability Analysis of Switched Delay Systems with All Subsystems Unstable

Guang-Deng Zong,Qingzhi Wang,Haibin Sun 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.5

The stability problem of switched delay systems with all subsystems unstable is investigated in this paper. A sufficient criterion is firstly proposed to guarantee asymptomatic stability of nonlinear switched delay systemswith all subsystems unstable, where the stabilization property of switching behaviors is exploited to compensate thedivergence of states. Then by constructing multiple discretized Lyapunov-Krasovskii functionals, stability criteriaare developed for linear switched time-invariant and time-varying delay systems with all subsystems unstable. Finally, two examples are provided to illustrate the feasibility, superiority and application of the proposed approach.

Mechanisms Underlying the Role of Myeloid-Derived Suppressor Cells in Clinical Diseases: Good or Bad

Ge Yongtong,Cheng Dalei,Jia Qingzhi,Xiong Huabao,Zhang Junfeng 대한면역학회 2021 Immune Network Vol.21 No.3

Myeloid-derived suppressor cells (MDSCs) have strong immunosuppressive activity and are morphologically similar to conventional monocytes and granulocytes. The development and classification of these cells have, however, been controversial. The activation network of MDSCs is relatively complex, and their mechanism of action is poorly understood, creating an avenue for further research. In recent years, MDSCs have been found to play an important role in immune regulation and in effectively inhibiting the activity of effector lymphocytes. Under certain conditions, particularly in the case of tissue damage or inflammation, MDSCs play a leading role in the immune response of the central nervous system. In cancer, however, this can lead to tumor immune evasion and the development of related diseases. Under cancerous conditions, tumors often alter bone marrow formation, thus affecting progenitor cell differentiation, and ultimately, MDSC accumulation. MDSCs are important contributors to tumor progression and play a key role in promoting tumor growth and metastasis, and even reduce the efficacy of immunotherapy. Currently, a number of studies have demonstrated that MDSCs play a key regulatory role in many clinical diseases. In light of these studies, this review discusses the origin of MDSCs, the mechanisms underlying their activation, their role in a variety of clinical diseases, and their function in immune response regulation.