Postcoloniality Diluted In The Fourth Space : Predicament and Appeal

Zhenyuan Yang 한국외국어대학교 통번역연구소 2019 한국외국어대학교 통번역연구소 학술대회 Vol.2019 No.07

Study on Calculation Method of Long Term Deformation of RAC Beam based on Creep Adjustment Coefficient

Chao Liu,Zhenyuan Lv,Chao Zhu,Guoliang Bai,Yu Zhang 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.1

The creep shrinkage of concrete is an important factor in the long-term deformation of concrete structures. It is also a key link for solving long-term deformation calculation accuracy and complex calculation forms. In this paper, a 1200-day long-term deformation test was conducted on beams with 0%, 50%, and 100% substitution ratios of recycled coarse aggregate. Meanwhile, based on the principle of virtual work, the creep coefficient of recycled concrete is introduced into the calculation of additional curvature of the beam section, and the formula for calculating the long-term deformation of recycled concrete is established. According to the size of recycled coarse aggregate, through the calculation of creep and shrinkage of concrete, the regeneration adjustment coefficient of concrete creep and shrinkage, the calculation results into three typical model of ordinary concrete creep and shrinkage, creep and shrinkage of concrete and regeneration model of deformation calculation of long period, the calculated and experimental results agree well; based on this, the deflection increase coefficient is proposed, which simplifies the long-term calculation formula. It not only can meet the calculation accuracy requirements, but also can be easily adapted to engineering promotion.

A Light Spot Centroid Determination Method for Accurate Digital Refractometer

Zhenxing Wang,Zhenyuan Jia 제어로봇시스템학회 2023 제어로봇시스템학회 국제학술대회 논문집 Vol.2023 No.10

Fabrication of N-doped Reduced Graphene Oxide/Ag3PO4 Nanocomposite with Excellent Photocatalytic Activity for the Degradation of Organic Pollutants

Longhai Feng,Lirong Kong,Zhenyuan Ji,Yi Wang,Xiaoping Shen 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.1

An efficient N-doped reduced graphene oxide (N-RGO)/Ag3PO4 nanocomposite with enhanced photocatalytic activity has been prepared through a facile solution-based approach. Since N-RGO could offer more sites for the anchoring of Ag3PO4 nanoparticles, and effectively promote the charge carriers separation and transfer due to its high electrical conductivity, the photocatalytic activity of N-RGO/Ag3PO4 nanocomposite is much higher than bare Ag3PO4 and N-RGO in the degradation of phenol pollutant under simulated solar light irradiation. The mechanism for the photocatalytic process was also investigated. The excellent photocatalytic performance makes the N-RGO/Ag3PO4 nanocomposite a promising photocatalyst for organic pollutant treatment.

Formation of Ohmic contacts on laser irradiated n-type 6H-SiC without thermal annealing

Yan Wu,Lingfei Ji,Zhenyuan Lin,Minghui Hong,Sicong Wang,Yongzhe Zhang 한국물리학회 2019 Current Applied Physics Vol.19 No.4

In this work, KrF excimer laser irradiation of n-type SiC is used to form Ohmic contacts at the interfaces between the irradiated SiC and various types of metals with different work functions without subsequent thermal annealing. Ohmic contacts are formed between laser-treated 6H-SiC and Ti at a laser fluence of 0.7 J/cm2. Moreover, in the fluence range of 0.7–1.3 J/cm2, Ohmic characteristics are also observed between irradiated 6HSiC and Au, which is a representative inert metal. The laser-induced heavy doping effect reduces the thickness of the Schottky barrier between the metal and SiC, and the formation of graphene sheets on the irradiated SiC surface reduces the barrier height, resulting in the direct formation of Ohmic contacts. Our findings thus demonstrate the potential of this laser treatment method to achieve Ohmic contacts between n-type SiC and a broad range of metal electrodes without requiring high-temperature annealing.

The influence of soil aggregation induced by water content variation on the engineering behaviors of cement-treated silt subgrade

Sai Zhang,Jian-Wen Ding,Zhenyuan Lai,Qinying Guo,Xing Wan 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.10

Water content is an important indicator of highway subgrade compaction, which has an impact on the engineering behaviors of pavement structures significantly. To study the influence of soil aggregation induced by water content variation on the engineering behaviors of silt subgrade, a series of laboratory experiments, including sieving analysis, unconfined compression tests and hydraulic conductivity tests, were conducted on the cement-treated silt subgrade. The influence of water content on the soil aggregation, unconfined compressive strength (UCS) and hydraulic conductivity were examined, respectively. The distribution range of UCS index (IUCS) and hydraulic conductivity index (Ik) were expressed accordingly. Test results demonstrate that when the water content lower than the optimum water content (wopt), the specimens are more homogeneous, the UCS increases regularly with the increase of curing time and water content, the hydraulic conductivity decreases regularly with curing time and water content increased. When the water content is higher than the wopt, the silt aggregation leads to the structural inhomogeneity of specimens, the strength decreases irregularly with the increase of curing time and water content, the hydraulic conductivity increases irregularly with the increase of curing time and water content accordingly. The soil aggregation induced by water content variation is proved to be a major reason for the ununiformly distribution of the UCS and hydraulic conductivity, the influence of which is more significant than that of binders when the water content higher than the wopt. Hence, controlling water content within 2% lower the wopt is strongly suggested to forming a more homogeneous structure of the subgrade.

Nematicidal effect of volatiles produced by Trichoderma sp.

Zhongshan Yang,ZeFen Yu,,Liping Lei,Zhenyuan Xia,Li Shao,Ke Qin Zhang,Guo Hong Li 한국응용곤충학회 2012 Journal of Asia-Pacific Entomology Vol.15 No.4

Trichoderma is an important biocontrol agent that produces metabolites harmful to nematodes. We investigated the volatile organic compounds (VOCs) of Trichoderma sp. YMF 1.00416 and examined their abilities to kill nematodes. Chemical investigations of the VOCs from this strain led to the isolation and identification of three metabolites: a new compound, 1β-vinylcyclopentane-1α,3α-diol (1) and two known metabolites, 6-pentyl-2H-pyran-2-one (2) and 4-(2-hydroxyethyl)phenol (3). Nematicidal activity assays showed that compound 2 was nematicidal, and killed >85% of Panagrellus redivivus, Caenorhabditis elegans,and Bursaphelenchus xylophilus in 48 h at 200 mg/L in a 2 mL vial. Our results will help identify new nematicides.

Inter-ramet Physiological Integration Detected in Buffalograss (Buchloe dactyloides (Nutt.) Engelm.) under Water Stress

뀐용퀴양,Deying Li,Lei Han,Guansheng Ju,Junxiang Liu,Juying Wu,Zhenyuan Sun 한국잔디학회 2009 Weed & Turfgrass Science Vol.23 No.2

Buffalograss is an important turfgrass species with excellent cold, heat, and drought tolerance. Understanding the physiological integration of buffalograss under heterogeneous conditions helps to develop cultural practices that better use limited resources for uniform turf quality. The objective of this study was to evaluate physiological integration of buffalograss under water deficit stress and the involvement of lipid peroxidation and antioxidants in the process. In one experiment, buffalograss was planted in the center of a four-compartment growth unit. Watering frequencies, once a week(+) and once in two weeks(-), were combined with the sand(S) or peat(P) in each unit to generate five total treatments(P+S-P-S+, P+P+P+P+, S-S-S-S-, P-P-P-P-, and S+S+S+S+). The average number of shoot established from the heterogeneous root-zone medium was higher than the average of four possible homogeneous media. In second experiment, single ramet in Hoagland solution(S0) or single ramet in Hoagland solution with 20% PEG-6000(Ss) were compared with two connectedramets under different treatments. Treatments for connected ramets were young ramet in Hoagland solution(Yos) and old ramet in Hoagland solution with 20% PEG-6000(Oos), and old ramet in Hoagland solution(Oys) and young ramet in Hoagland solution with 20% PEG-6000(Yys). Lipid peroxidation, antioxidants, and proline showedphysiological integration between ramets subjected to different levels of water stress. Superoxide dismutase(SOD), Guaiacol peroxidase(G-POD), malondialdehyde(MDA), and free proline also showed different time courses and relative activities during the physiological integration. Buffalograss is an important turfgrass species with excellent cold, heat, and drought tolerance. Understanding the physiological integration of buffalograss under heterogeneous conditions helps to develop cultural practices that better use limited resources for uniform turf quality. The objective of this study was to evaluate physiological integration of buffalograss under water deficit stress and the involvement of lipid peroxidation and antioxidants in the process. In one experiment, buffalograss was planted in the center of a four-compartment growth unit. Watering frequencies, once a week(+) and once in two weeks(-), were combined with the sand(S) or peat(P) in each unit to generate five total treatments(P+S-P-S+, P+P+P+P+, S-S-S-S-, P-P-P-P-, and S+S+S+S+). The average number of shoot established from the heterogeneous root-zone medium was higher than the average of four possible homogeneous media. In second experiment, single ramet in Hoagland solution(S0) or single ramet in Hoagland solution with 20% PEG-6000(Ss) were compared with two connectedramets under different treatments. Treatments for connected ramets were young ramet in Hoagland solution(Yos) and old ramet in Hoagland solution with 20% PEG-6000(Oos), and old ramet in Hoagland solution(Oys) and young ramet in Hoagland solution with 20% PEG-6000(Yys). Lipid peroxidation, antioxidants, and proline showedphysiological integration between ramets subjected to different levels of water stress. Superoxide dismutase(SOD), Guaiacol peroxidase(G-POD), malondialdehyde(MDA), and free proline also showed different time courses and relative activities during the physiological integration.

Precise Tool Setting Method for CNC Machining Compound Spiral Antenna Based on Binocular Micro Stereo Vision

Wei Liu,Kai Zhao,Peng Gao,Ling Wang,Lichao Ding,Jianwei Ma,Zhenyuan Jia 한국생산제조학회 2014 한국생산제조시스템학회 학술발표대회 논문집 Vol.2014 No.9(2)

Inter-ramet Physiological Integration Detected in Buffalograss (Buchloe dactyloides (Nutt.) Engelm.) under Water Stress

Yongqiang Qian(뀐용퀴앙),Deying Li(이다이엥),Lei Han(한레이),Guansheng Ju(주관쉥),Junxiang Liu(류준샹),Juying Wu(위주잉),Zhenyuan Sun(선젠얀) 한국잡초학회·한국잔디학회 2009 Weed & Turfgrass Science Vol.23 No.2

Buffalograss는 내한, 내서, 그리고 내한발에 우수한 주요 잔디 종 중 하나이다. 다양한 환경에서 buffalograss의 생리학적 조정(integration)을 이해하는 것은 균일한 잔디의 질을 도모하고 경종적 재배방법의 개발에 도움이 된다. 본 연구의 목적은 물 부족의 스트레스 처리에서의 buffalograss의 생리학적 조정과정에서 lipid peroxidation과 산화방지제의 연관성을 평가하였다. 한 실험에서 buffalograss는 네 개의 구분된 칸막이 성장 유닛의 중심에서 재배되었고, 일주일에 한번(+), 일주일에 두 번(-) 관수처리와 모래(S) 또는 피트(P)와를 혼합한 다섯 가지 토양 조합으로 처리하였다(P+S-P-S+, P+P+P+P+, S-S-S-S-, P-P-P-P-, and S+S+S+S+). 그 결과, 균일하게 혼합된 상토에서 생장한 줄기의 수가 네개의 단일 상토에 정착한 것보다 더 많았다. 두 번째 실험에서는 Hoagland 용액(S?), 또는 20% PEG-6000이 함유된 Hoagland용액(Ss)안에 하나의 라미트(무성생식체) 혹은 연결된 라마트를 다음과 같은 여러 가지 처리와 비교 실험하였다. 연결된 라미트들의 처리는 Hoagland 용액안의 어린 라미트(Yos)와 20%PEG-6000가 함유된 Hoagland 용액안의 성숙한 라미트(Oos), Hoagland 용액 단독에 성숙한 라미트(Oys), 20%PEG-6000 함유된 Hoagland 용액안의 어린 라미트(Yys)였다. Lipid peroxidation, antioxidants, proline은 각기 다른 수분 stress 정도에서 라미트들 간의 생리학적 활성을 보여주었다. Superoxide dismutase (SOD), Guaiacol peroxidase (G-POD), malondi aldehyde (MDA), free proline의 활성도 처리 후 시간에 따라 상대적인 생리학적 활성을 보였다. Buffalograss is an important turfgrass species with excellent cold, heat, and drought tolerance. Understanding the physiological integration of buffalograss under heterogeneous conditions helps to develop cultural practices that better use limited resources for uniform turf quality. The objective of this study was to evaluate physiological integration of buffalograss under water deficit stress and the involvement of lipid peroxidation and antioxidants in the process. In one experiment, buffalograss was planted in the center of a four-compartment growth unit. Watering frequencies, once a week(+) and once in two weeks(-), were combined with the sand(S) or peat(P) in each unit to generate five total treatments (P+S-P-S+, P+P+P+P+, S-S-S-S-, P-P-P-P-, and S+S+S+S+). The average number of shoot established from the heterogeneous root-zone medium was higher than the average of four possible homogeneous media. In second experiment, single ramet in Hoagland solution(S?) or single ramet in Hoagland solution with 20% PEG-6000(Ss) were compared with two connectedramets under different treatments. Treatments for connected ramets were young ramet in Hoagland solution(Yos) and old ramet in Hoagland solution with 20% PEG-6000(Oos), and old ramet in Hoagland solution(Oys) and young ramet in Hoagland solution with 20% PEG-6000(Yys). Lipid peroxidation, antioxidants, and proline showedphysiological integration between ramets subjected to different levels of water stress. Superoxide dismutase(SOD), Guaiacol peroxidase(G-POD), malondialdehyde(MDA), and free proline also showed different time courses and relative activities during the physiological integration.