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Chen Sheng-tao,Li Dong-ju,Tian Hao,Hou Jiao-yi,Ning Da-yong,Gong Yong-jun 대한조선학회 2022 International Journal of Naval Architecture and Oc Vol.14 No.1
Maneuverability, which is closely related to navigation safety, is an important part of the overall performance of an underwater vehicle. The purpose of this study is to analyze the dynamic response of an underwater vehicle to internal waves at different angles and speeds. A combination of experiments and numerical simulations is used to compare the forces on the underwater vehicle. In terms of fluidstructure coupling, the internal wave interface is tracked by the VOF method. In this paper, waves of the same amplitude ratio as the numerical results are simulated using a wave-making sphere. The validity of the numerical method is verified by comparing with the rotation moment test of the underwater vehicle. The results show that different angles of attack have significant effects on the forces and moments of the underwater vehicle and that choosing the right angle of attack and rotation speed can limit the dangerous depth. The conclusion is of certain significance for the safety of underwater navigation.
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.
Weng, Ling-Ling,Xiang, Jian-Feng,Lin, Jin-Bo,Yi, Shang-Hui,Yang, Li-Tao,Li, Yi-Sheng,Zeng, Hao-Tao,Lin, Sheng-Ming,Xin, Dong-Wei,Zhao, Hai-Liang,Qiu, Shu-Qi,Chen, Tao,Zhang, Min-Guang Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.24
Liver cancer is one of leading digestive malignancies with high morbidity and mortality. There is an urgent need for the development of novel therapies for this deadly disease. It has been proven that asparagus polysaccharide, one of the most active derivates from the traditional medicine asparagus, possesses notable antitumor properties. However, little is known about the efficacy of asparagus polysaccharide as an adjuvant for liver cancer chemotherapy. Herein, we reported that asparagus polysaccharide and its embolic agent form, asparagus gum, significantly inhibited liver tumor growth with transcatheter arterial chemoembolization (TACE) therapy in an orthotopic hepatocellular carcinoma (HCC) tumor model, while significantly inhibiting angiogenesis and promoting tumor cell apoptosis. Moreover, asparagine gelatinous possessed immunomodulatory functions and showed little toxicity to the host. These results highlight the chemotherapeutic potential of asparagus polysaccharide and warrant a future focus on development as novel chemotherapeutic agent for liver cancer TACE therapy.
Sheng, Xu-Dong,Chen, Hu,Wang, Hui,Ding, Zhi-Bin,Xu, Gang-Zhu,Zhang, Jun-Feng,Lu, Wen-Chao,Wu, Tao,Zhao, Ling Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.2
Fibulin-5 has recently been considered as a potential tumor suppressor in human cancers. Several studies have shown that it is down-regulated in a variety of tumor types and inhibits tumor growth and metastasis. This study was aimed to investigate the clinical significance of fibulin-5 in glioma and its role in cell proliferation and invasion. We found that the expression of fibulin-5 in glioma tissues was significantly lower than those in normal brain (NB) tissues. Negative expression was significantly correlated with advanced clinical stage (grade III+IV). Furthermore, Fibulin-5 negative expression was correlated with a shorter overall survival of glioma patients. Multivariate Cox repression analysis indicated that fibulin-5 was an independent factor for predicting overall survival of glioma patients. Overexpression obviously inhibited cell proliferation in U251 and U87 cells. Furthermore, it significantly reduced the number of migrating and invading glioma cells. In conclusion, impaired expression of fibulin-5 is correlated with the advanced tumor stage in glioma. Otherwise, Fibulin-5 is an independent prognostic marker for predicting overall survival of glioma patients. Mechanistically, it may function as a tumor suppressor via inhibiting cell proliferation and invasion in gliomas.
Tao Gu,Li‑Min Wang,Qiang Hu,Xiu‑Bing Liang,Dong‑Xing Fu,Yong‑Xiong Chen,Xin‑Ming Zhao,Yan‑Wei Sheng 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.11
An equiatomic refractory high-entropy alloy (RHEA) NbMoTaWRe is prepared by mechanical alloying (MA) and sparkplasma sintering (SPS). The effects of mechanical alloying and sintering behaviors on the microstructure and propertiesof the RHEA are investigated. After ball-milling for 30 h, the metastable and supersaturated MA powders with the bodycenteredcubic (BCC) structure are obtained. Then, the MA powders are sintered using the SPS method under the sinteringtemperature range of 1700–1900 °C, and the C atoms and WC introduced by the MA process reacts with the metastable andsupersaturated Ta/Nb phase of the MA powers to form the face-centered cubic (FCC) structure (Nb, Ta)C particles alongthe BCC matrix boundaries during the SPS process. The NbMoTaWRe alloy sintered at 1800 °C consisted of BCC matrixand FCC-type (Nb, Ta)C particles has high compactness (porosity fraction is 0.32%), fracture strength (2630 MPa), plasticstrain (6.82%), and hardness (992 ± 20 HV). These excellent properties of this RHEA are mainly attributed to the combinationof multi-effects, including sintering densification, grain refinement strengthening from the refined sizes (3.80 μm) BCCmatrix, precipitation strengthening from the (Nb, Ta)C particles, solid solution strengthening from multi-principal elementsand interstitial solid solution strengthening from C atoms dissolving into BCC matrix.
Sheng Hongtao,Zhu Qianlong,Tao Jun,Zhang Huaying,Peng Feixiang 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.1
Based on the analysis of the interaction mechanism between the photovoltaic grid-connected inverter and the background harmonic of the distribution network, an optimal planning strategy for changing the equivalent impedance of the common connection point from the grid side of the inverter to suppress the harmonic amplifcation of the grid-side harmonic voltage near the resonant frequency point is proposed. The optimization strategy is based on the static distribution network reconfguration and photovoltaic confguration as the main means to optimize the equivalent impedance of the photovoltaic gridconnected point. At the same time, the active network loss and voltage deviation of the distribution network are optimized, and the mean value of harmonic voltage distortion rate, network loss and voltage deviation of harmonic monitoring points are taken as the objective function. At the same time, the harmonic monitoring points are optimized by the Pearson correlation coefcient, and the harmonic level of the whole distribution system is refected by the harmonic monitoring points. Taking IEEE-33 and IEEE-69 bus distribution systems as examples for comparative analysis, the NSGAII algorithm is used to solve the problem. The results show that the joint optimization of distribution network reconfguration and photovoltaic confguration can efectively suppress the interaction between photovoltaic injection harmonics and background harmonics of the distribution network. It efectively reduces the active power loss of the whole distribution network and the voltage deviation of the distribution network bus, and improves the minimum voltage of the distribution network. The efectiveness of the proposed PV optimal confguration strategy is verifed by comparing the examples of diferent distribution systems.
Tunable Bandgap of Monolayer Black Phosphorus by Using Vertical Electric Field: a DFT Study
Tao Wang,Yan Liu,Qing Guo,Bin Zhang,Kuang Sheng,Can Li,You Yin 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.6
Using a ab initio plane-wave ultrasoft pseudopotential method based on the generalized gradientapproximation (GGA), we investigate the bandgap tuning in monolayer black phosphorus byapplying external electric fields perpendicular to the layers. The bandgap continuously decreaseswith increasing applied electric fields, eventually rendering them metallic. We use the giant Starkeffect, which is essentially characterized by an interlayer spacing to explain the rate of change ofthe bandgap with the applied external field. The atomic distance and charges also contribute to thesemiconductor-to-metal transition. Our investigations show the bandgap change for the fabricationof novel electronic and photonic devices.
Tao Wang,Aili Yan,Longgang Zhong,Sheng Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.10
The main issue limiting the widespread application of superhydrophobic coatings is their low surface robustness, which is closely related to surface roughness on the micro- or nanoscale, and is mechanically weak and easily gets abraded. This work uses Te nanowires as templates to support a carbon layer substrate for the growth of titanium dioxide nanoparticles; this forms hierarchical structures (Te@C-TiO2 nanocomposites). Modification with 1H, 1H, 2H, 2H - perfluoroalkyltriethoxysilane created a free-standing superhydrophobic coating. The optimal preparation conditions for the coating were identified after a systematic investigation of the reaction time of the carbon precursor and concentration of TiOSO4. The best anti-wetting performance was attained with 200 nm diameter Te@C and 15mL concentration of TiOSO4. Furthermore, due to their free-standing performance, the nanocomposites were easily loaded onto a polyester fabric to generate a robust superhydrophobic fabric. This fabric shows excellent mechanical durability and strong resistance to knife scratching, sandpaper abrasion, washing, as well as exposure to acid and alkali solutions. Moreover, the robust fabric is able to separate oil/water mixtures with high separation efficiency.
An automated control system for concrete temperature development in construction
Sheng Qiang,Xue-jun Leng,Xiang-rong Wang,Jing-tao Zhang,Xia Hua 사단법인 한국계산역학회 2019 Computers and Concrete, An International Journal Vol.24 No.5
PLC and its expansion module, electric ball valve and cooling pipe, electric heating steel plate and various components of the system, which is used to control test and process data. By automatically adjusting the opening of the valve, the system makes the top temperature and cooling speed develop along the ideal temperature diachronic curve. Moreover, the system enables the temperature difference between inside and surface of test block limited in a given range by automatically controlling the surface board heating. The method of physical simulation test by sandbox with built-in cooling water pipe and heating rod is adopted. On the premise of a given standard value, the operation of the system is checked under different working conditions. Further, an extension of this system is proposed, which enables its application to obtain some thermal parameters when cooperating with numerical simulation.