Characteristics of the multiphase flow field with super-cavitation induced by successively fired projectiles under-water and cross-medium

Dong-Hui Zhou,Hong-Hui Shi,Hui-Xia Jia 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.1

The multiphase flow field with supercavitation induced by successively fired underwater projectiles is very complicated. It involves the interaction of two or more supercavitating flow fields, which is very different from the supercavitating flow of single underwater projectile. In the paper, the multiphase flow field with supercavitation induced by two successively fired projectiles underwater and cross-media (water-entry and water-exit) was simulated. The interaction effect between supercavities induced by two projectiles was particularly analyzed. The influence mechanism of the supercavity evolution on the motion of two projectiles was also analyzed. The results indicate that, the supercavitating flow fields of two successively fired underwater projectiles interact on each other. The coalescence, separation and collapse of cavities occur during the interaction stage of the supercavitating flow fields, which causes that the second-fired projectile enters the supercavity of the first one. The second-fired projectile can catch up with the first one and then a rear-end collision happens. The collision causes disturbances on the supercavity contour. The impact load of the secondfired projectile during the water-entry period is smaller than that of the first one. The cavities induced by the first- and second-fired projectiles coalesce each other into a cavity, and the second-fired projectile is finally completely wrapped by a supercavity. During the water-entry process, a rear-end collision also happens. In the process of water-exit, the supercavity induced by the first-fired projectile is blocked under the free surface, and then the first-fired projectile flies into the air after throwing off the water layer. Under the influence of the supercavity separated by the first-fired projectile, the second-fired projectile can escape from its own supercavity, and then enter the supercavity of the first-fired projectile. With the supercavity collapse of the first-fired projectile, a new partial cavity generates around the second-fired projectile.

RECIPROCAL BEHAVIOR OF THE INBOUND GROUP TUORISTS IN TIBET

Li Hui,Yang Zhenzhi,Li Taohong,Shi Hong 글로벌지식마케팅경영학회 2016 Global Marketing Conference Vol.2016 No.7

Based on the reciprocity theory, a dynamic reciprocal behavior model is verified by sampling the US and French group tourists in Tibet. Result shows that the US group tourists have only negative reciprocity, and French ones have both positive and negative reciprocity, indicating that tourists are more willing to sacrifice their interests to revenge hostile persons.

Influence of selected host plants on biology of castor whitefly, Trialeurodes ricini (Hemiptera: Aleyrodidae)

Hong Huang,Hui Zhao,Yong-Mei Zhang,Shi-Ze Zhang,Tong-Xian Liu 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.4

The development time, immature survivorship, immature size, tertiary sex ratio, pre-oviposition period, fecundity,and preferences of the castor whitefly, Trialeurodes ricini on four host plant species (castor, eggplant, cottonand green bean) were evaluated under laboratory conditions. Development time from egg to adult emergencewas the longest on cotton (33.3 days), the shortest on green bean (25.4 days), and intermediate on eggplant(28.5 days) and castor (28.3 days). The survival rate was the highest on castor (92.5%), followed by those ongreen bean (80.2%) and eggplant (73.8%), and the lowest on cotton (42.6%). The sex ratio was the highest on cotton(♀:♂ = 2.45:1.00), the lowest on eggplant (♀:♂ = 0.75:1.00), and intermediate on castor and green bean(♀:♂= 1.04:1.00). T. ricini immatures and adultswere generally largerwhen reared on castor and eggplant thanon other plants. The net reproduction rate (R0) was 57.656 females per female per generation, the generationtime(T) was 35.9 days, the intrinsic rate of increase (rm)was 0.1128 eggs per female per day, the gross reproductionrate (GRR) was 108.04 eggs per female per generation, the finite rate of increase (λ) was 1.1194 females perfemale per day, and the doubling time (DT) was 6.1149 days. In both no-choice and two-choice tests, T. riciniadults preferred castor for feeding and oviposition

3D Machining Allowance Analysis Method for the Large Thin-Walled Aerospace Component

Hui Wang,Ming-Xing Zhou,Weizhen Zheng,Zhi-Bin Shi,Hong-Wei Li 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.3

The structural distortion problem of large thin-walled aerospace components has roused much concern on more agile, digitized and cost-efficient precision manufacturing techniques, in particular, designing suitable machining plans according to the real shape of workpieces. To improve the machining accuracy of large thin-walled aerospace components, a methodology of three-dimensional machining allowance modeling and analysis is proposed in this paper. Firstly, the fundamental principles of 3D models matching and alignment between the casting blank and the design part are presented. And by datum transformation from virtual design references to real-world references on casting blanks which are accessible more easily, measuring, positioning and machining the casting blank will be more convenient to realize. Furthermore, the technical character of a large thin-walled aerospace component is considered and a technical framework for 3D machining allowance analysis is given. Finally, the proposed methodology is validated by an experimental study using a typical large thin-walled aerospace component of a hypersonic vehicle. Improvements in accuracy and efficiency performance are realized in comparison with traditional methods.

miR-140-3p Knockdown Suppresses Cell Proliferation and Fibrogenesis in Hepatic Stellate Cells via PTEN-Mediated AKT/mTOR Signaling

Shi-Min Wu,Tian-Hong Li,Hao Yun,Hong-Wu Ai,Ke-Hui Zhang 연세대학교의과대학 2019 Yonsei medical journal Vol.60 No.6

Purpose: Liver fibrosis is a major cause of morbidity and mortality and the outcome of various chronic liver diseases. Activationof hepatic stellate cells (HSCs) is the key event in liver fibrosis. Studies have confirmed that miR-140-3p plays a potential regulatoryeffect on HSC activation. However, whether miR-140-3p mediates the liver fibrosis remains unknown. Materials and Methods: Expression of miR-140-3p was detected by real-time quantitative PCR (qPCR). Cell proliferation wasmeasured by MTT, while cell apoptosis rate was determined via flow cytometry. Western blot assay was used to detect the expressionof cleaved PARP. The fibrogenic effect was evaluated by expression of α-smooth muscle actin and desmin. Functional experimentswere performed in transforming growth factor β1 (TGF-β1)-induced HSC-T6 cells with transfection of anti-miR-140-3pand/or siPTEN. Target binding between miR-140-3p and PTEN was predicted by the TargetScan database and identified usingluciferase reporter assay and RNA immunoprecipitation. Results: TGF-β1 induced the activation of HSC-T6 cells, and miR-140-3p expression varied according to HSC-T6 cell activationstatus. Knockdown of miR-140-3p reduced cell proliferation and the expressions of α-SMA and desmin, as well as increasedapoptosis, in TGF-β1-induced HSC-T6 cells, which could be blocked by PTEN silencing. Additionally, inactivation of the AKT/mTOR signaling pathway stimulated by miR-140-3p knockdown was abolished when silencing PTEN expression. PTEN was negativelyregulated by miR-140-3p via direct binding in HSC-T6 cells. Conclusion: miR-140-3p is an important mediator in HSC-T6 cell activation, and miR-140-3p knockdown suppresses cell proliferationand fibrogenesis in TGF-β1-induced HSC-T6 cells, indicating that miR-140-3p may be a potential novel molecular targetfor liver fibrosis.

Utrecht Interstitial Applicator Shifts and DVH Parameter Changes in 3D CT-based HDR Brachytherapy of Cervical Cancer

Shi, Dan,He, Ming-Yuan,Zhao, Zhi-Peng,Wu, Ning,Zhao, Hong-Fu,Xu, Zhi-Jian,Cheng, Guang-Hui Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.9

Background: For brachytherapy of cervical cancer, applicator shifts can not be avoided. The present investigation concerned Utrecht interstitial applicator shifts and their effects on organ movement and DVH parameters during 3D CT-based HDR brachytherapy of cervical cancer. Materials and Methods: After the applicator being implanted, CT imaging was achieved for oncologist contouring CTVhr, CTVir, and OAR, including bladder, rectum, sigmoid colon and small intestines. After the treatment, CT imaging was repeated to determine applicator shifts and OARs movements. Two CT images were matched by pelvic structures. In both imaging results, we defined the tandem by the tip and the base as the marker point, and evaluated applicator shift, including X, Y and Z. Based on the repeated CT imaging, oncologist contoured the target volume and OARs again. We combined the treatment plan with the repeated CT imaging and evaluated the change range for the doses of CTVhr D90, D2cc of OARs. Results: The average applicator shift was -0.16 mm to 0.10 mm for X, 1.49 mm to 2.14 mm for Y, and 1.9 mm to 2.3 mm for Z. The change of average physical doses and EQD2 values in Gy${\alpha}/{\beta}$ range for CTVhr D90 decreased by 2.55 % and 3.5 %, bladder D2cc decreased by 5.94 % and 8.77 %, rectum D2cc decreased by 2.94 % and 4 %, sigmoid colon D2cc decreased by 3.38 % and 3.72 %, and small intestines D2cc increased by 3.72 % and 10.94 %. Conclusions: Applicator shifts and DVH parameter changes induced the total dose inaccurately and could not be ignored. The doses of target volume and OARs varied inevitably.

The infection status of anisakid larvae in marine fish and cephalopods from the Bohai Sea, China and their taxonomical consideration

Hong-Wei MA,Tai-Jing JIANG,Fu-Shi QUAN,Xiao-Guang CHEN,Hui-dong WANG,Yun-Shu ZHANG,Ming-Shan CUI,Wen-Yan ZHI,Dian-Chen JIANG 대한기생충학열대의학회 1997 The Korean Journal of Parasitology Vol.35 No.1

Construction of an Oscillator Gene Circuit by Negative and Positive Feedbacks

( Shi Hui Shen ),( Yu Shu Ma ),( Yu Hong Ren ),( Dong Zhi Wei ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.1

Synthetic oscillators are gene circuits in which the protein expression will change over time. The delay of transcription, translation, and protein folding is used to form this kind of behavior. Here, we tried to design a synthetic oscillator by a negative feedback combined witha positive feedback. With the mutant promoter PLacC repressed by LacIq and PLux activated by AHL-bound LuxR, two gene circuits, Os-LAA and Os-ASV, were constructed and introduced into LacI-deleted E. coli DH5α cells. When glucose was used as the carbon source, a low level of fluorescence was detected in the culture, and the bacteria with Os-ASV showed no oscillation, whereas a small portion of those carrying Os-LAA demonstrated oscillation behavior with a period of about 68.3 ± 20 min. When glycerol was used as the carbon source, bacteria with Os-ASV demonstrated high fluorescence value and oscillation behavior with the period of about 121 ± 21 min.

Prediction of Equivalent Chloride Ion Diffusion Coefficient in Cracked Concrete of the in-Service RC Element

Xiao-Hui Wang,Dong-Gang Hu,Ahmad Kueh Beng Hong,Dan-Da Shi 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.5

Considering the influence of the visible load-induced transverse cracks on chloride ion diffusion in cracked concrete of the in-service reinforced concrete (RC) elements under marine environment, a typical concrete volume with one transverse crack was taken to establish the governing equation. Assuming the crack widths at the outer lateral and bottom surfaces were equal, a model to predict the equivalent chloride diffusion coefficient in cracked concrete was put forward to consider the influence of the average transverse crack width, crack spacing and crack extending lengths in beam height and width directions on chloride diffusion. Results show that the proposed model can better reflect the variation trend of the equivalent chloride diffusion coefficient with different crack widths in in-service RC elements under marine environment.

Super-SBM-DEA모형을 활용한 중국 문화산업 효율성에 관한 연구

사혜민(Shi, Hui-Min),정홍열(Jeong, Hong-Yul) 중국문화연구학회 2019 중국문화연구 Vol.0 No.43

In recent years, the cultural industry has become the most promising industry, and has become a representative industry for the upgrading of global industrial structure. However, more and more countries have begun to implement cultural economic strategies in order to seek cultural industries to become the emerging pillar of the national economy. Since the implementation of an opening and reform policy, China has achieved the rapid growth of the economy. With the growth of national income, the demand of culture is also increasing. China is a big manufacturing country in the world. Hence, traditional industries have high resource consumption, serious pollution and overcapacity. There is an urgent need for economic transformation and structural adjustment. Due to its high technology content, low resource consumption and low environmental pollution, the Chinese cultural and creative industries have typical characteristics of low energy consumption, high added value, and environmental protection, which provide strong support for the transformation and upgrading of the national economy and the improvement of quality and efficiency. The economy has maintained an increasingly important role in maintaining high-speed growth. Under the new normal of economic development, when the structural reform of the supply side is fully promoted, the cultural industry continues to accelerate its development and is becoming a new engine for economic and social development. Nowadays, the Chinese cultural industry has developed relatively fast and the contribution rate to the national economy is steadily increasing. However, it has many problems such as the weakness of Chinese cultural industry in general ability, the structure of cultural industry is unreasonable, other industries and collaboration system are not built up. Understanding the technological efficiency, which is a key indicator determining the competitiveness of the Chinese cultural industry, is very important for enhancing the competitiveness of China"s cultural industry and promoting sustainable development. Therefore, the Super-SBM-DEA model and Malmquist index are used to analyze the level of technological efficiency of the Chinese cultural industry in detail, and to suggest ways to measure the efficiency of the Chinese cultural industry.