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RISS 인기검색어
- 검색키워드
- 저자 : ( Tong-bao Zhang ) (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Analysis on the creep response of bolted rock using bolted burgers model
Zhao, Tong-Bin,Zhang, Yu-Bao,Zhang, Qian-Qing,Tan, Yun-Liang Techno-Press 2018 Geomechanics & engineering Vol.14 No.2
In this paper, the creep behavior of bolted rock was analyzed by using the unconfined creep tests and the numerical results. Based on the test results, the Bolted Burgers creep model (B-B model) was proposed to clarify the creep mechanism of rock mass due to rock bolts. As to the simulation of the creep behaviour of bolted rock, a new user-defined incremental iterative format of the B-B model was established and the open-source $FLAC^{3D}$ code was written by using the object-oriented language (C++). To check the reliability of the present B-B creep constitutive model program, a numerical model of a tunnel with buried depth of 1000 m was established to analyze the creep response of the tunnel with the B-B model support, the non-support and the bolt element support. The simulation results show that the present B-B model is consistent with the calculated results of the inherent bolt element in $FLAC^{3D}$, and the convergence deformation can be more effectively controlled when the proposed B-B model is used in the $FLAC^{3D}$ software. The big advantage of the present B-B creep model secondarily developed in the $FLAC^{3D}$ software is the high computational efficiency.
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Transcriptional analysis of Pieris rapae in response to P. rapae granulovirus
Hai-Jian Huang,Tong-Qiang Zhang,Qiao Lin, Jian-Hui Ye,Chuan-Xi ZHANG,Bao-Qin Zhang 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.2
Pieris rapae granulovirus (PrGV) is an important pathogen that has been exploited as a microbial insecticide to control agriculture pests. They can specifically infect cabbage butterfly (Pieris rapae), causing a series of pathological symptoms. In this infected P. rapae at 6 h and 72 h. As a result, a series of host genes were significantly modulated following PrGV infection, including those correlated with exoskeleton, ribosome, heat shock protein (HSP), proteasome, oxidation-reduction and apoptosis. Taken together, our study unveiled the P. rapae response to PrGV at different time point and provided a potential strategy for pest management.
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Li, Hong-Sheng,Chen, Jin-Hu,Zhang, Wei,Shang, Dong-Ping,Li, Bao-Sheng,Sun, Tao,Lin, Xiu-Tong,Yin, Yong Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.3
Objective: To evaluate the effect of intravenous contrast on dose calculation in radiation treatment planning for oesophageal cancer. Methods: A total of 22 intravein-contrasted patients with oesophageal cancer were included. The Hounsfield unit (HU) value of the enhanced blood stream in thoracic great vessels and heart was overridden with 45 HU to simulate the non-contrast CT image, and 145 HU, 245 HU, 345 HU, and 445 HU to model the different contrast-enhanced scenarios. 1000 HU and -1000 HU were used to evaluate two non-physiologic extreme scenarios. Variation in dose distribution of the different scenarios was calculated to quantify the effect of contrast enhancement. Results: In the contrast-enhanced scenarios, the mean variation in dose for planning target volume (PTV) was less than 1.0%, and those for the total lung and spinal cord were less than 0.5%. When the HU value of the blood stream exceeded 245 the average variation exceeded 1.0% for the heart V40. In the non-physiologic extreme scenarios, the dose variation of PTV was less than 1.0%, while the dose calculations of the organs at risk were greater than 2.0%. Conclusions: The use of contrast agent does not significantly influence dose calculation of PTV, lung and spinal cord. However, it does have influence on dose accuracy for heart.
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Li, Hong-Sheng,Kong, Ling-Ling,Zhang, Jian,Li, Bao-Sheng,Chen, Jin-Hu,Zhu, Jian,Liu, Tong-Hai,Yin, Yong Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.5
Objectives: The purpose of this study was to evaluate the geometric accuracy of thoracic anatomic landmarks as target surrogates of intrapulmonary tumors for manual rigid registration during image-guided radiotherapy (IGRT). Methods: Kilovolt cone-beam computed tomography (CBCT) images acquired during IGRT for 29 lung cancer patients with 33 tumors, including 16 central and 17 peripheral lesions, were analyzed. We selected the "vertebrae", "carina", and "large bronchi" as the candidate surrogates for central targets, and the "vertebrae", "carina", and "ribs" as the candidate surrogates for peripheral lesions. Three to six pairs of small identifiable markers were noted in the tumors for the planning CT and Day 1 CBCT. The accuracy of the candidate surrogates was evaluated by comparing the distances of the corresponding markers after manual rigid matching based on the "tumor" and a particular surrogate. Differences between the surrogates were assessed using 1-way analysis of variance and post hoc least-significant-difference tests. Results: For central targets, the residual errors increased in the following ascending order: "tumor", "bronchi", "carina", and "vertebrae"; there was a significant difference between "tumor" and "vertebrae" (p = 0.010). For peripheral diseases, the residual errors increased in the following ascending order: "tumor", "rib", "vertebrae", and "carina"; There was a significant difference between "tumor" and "carina" (p = 0.005). Conclusions: The "bronchi" and "carina" are the optimal surrogates for central lung targets, while "rib" and "vertebrae" are the optimal surrogates for peripheral lung targets for manual matching of online and planned tumors.
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Simulation and Analysis on Desulfurization of Biogas using Iron Oxide Particles
( Cheng-chang Lien ),( Min-wei Wang ),( Ming-hong Ke ),( Tong-bao Zhang ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Biogas has a great potential for renewable energy, it contained with hydrogen sulfide which can cause metal equipment corrosion. Therefore the Hydrogen sulfide must be remove before uses biogas, in order to remove hydrogen sulfide in biogas that let biogas passed through the desulfurization column during field application. Inside of the desulfurization column has the certain height of iron oxide particles, Hydrogen sulfide in biogas will generates adsorption reaction on the surface of the iron oxide particles and forms iron sulfide to achieve the purpose of biogas purification. The purpose of this study uses computational fluid dynamics (CFD) numerical simulation to simulate the desulfurization column at a certain amount of biogas to obtain the pressure between the inlet and the outlet of the desulfurization column, and also obtained the airflow velocity profile inside the desulfurization column. The results of this simulation are compared with the actual measured pressure data, it shows that both have a good consistency. For further, improve the upper end of the exit of the desulfurization column to an inverted funnel shape for comparative analysis, it found that the flow in the inverted funnel at the top of the desulfurization column has obviously slowed down which means the sudden contraction (sudden unremitting). This result will provide help to improve a uniformity of the air velocity in the non-central region of the desulfurization column, in order to promote the iron oxide particles of its effective utilization of biogas desulfurization.
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