THREE DIMENSIONAL UNSTEADY SIMULATION OF A MODEL FRANCIS HYDRAULIC TURBINE

Qi Shao,Yulin Wu,Shuhong Liu,Weizhang Wu,Xingming Tao 한국전산유체공학회 2003 한국전산유체공학회 학술대회논문집 Vol.2003 No.10

Failure Analysis on Pressure Leakage of FRP

Guoquan Qi,Dongtao Qi,Qiang Bai,Houbu Li,Bin Wei,Nan Ding,Dongna Zhang,Xiaodong Shao 한국섬유공학회 2019 Fibers and polymers Vol.20 No.3

The fiberglass reinforced plastic (FRP) pipe used in the ground gathering system of an oil field occurred leakagefailure during the pressure test on site after installation. Investigations were performed to identify the most probable causes of the pipe failures. Take three types of specimens for the study, which is the leak position of failure line; the non-leaked position of failure line and the standby pipeline after insulation. The study was conducted by reviewing the background of the incident, visual physical inspection, mechanical property test and finite element analysis. The reason for the failure of this batch pipe is that, a large number of circumferential cracks appear on the outer wall of the pipe under the external force dominated by the bending stress, which reduced the overall internal pressure performance and caused the leakage failure of the pipe line. The leakage failure during the pressure test on site is mostly located in the transition zone of the pipe body to joint, which is due to the discontinuity of wall thickness and uneven material.

미라클프룻 씨앗 및 잎 추출물의 항산화 활성 및 미백 효능

소기 ( Qi Shao ),이지안 ( Ji-an Lee ) 한국미용학회 2024 한국미용학회지 Vol.30 No.2

The seed and leaf 70% methanol extracts of miracle fruit (Synsepalum dulcificum) were investigated for its whitening activity for application as a functional ingredient in cosmetic products. At the leaf extract concentration of 100 mg/ml, the DPPH radical scavenging activity was found to be 94.58%, the ABTS+ radical scavenging activity was 36.62%. The total polyphenolic content of seed and leaf extract was 18.76 mgGAE/g, 71.42 mgGAE/g, respectively. The seed and leaf extracts reduced both tyrosinase activity and L-DOPA oxidation in a concentration-dependent manner. In B16F10 mouse melanoma cells, leaf extract inhibited 30% of melanin synthesis at 100 mg/ml. Miracle fruit seed and leaf extracts also inhibited the expression of melanogenesis genes such as microphthalmia-associated transcription factor (MITF), tyrosinase, tyrosinase-related protein (TRP)-1. Moreover, reverse transcriptionpolymerase chain reaction of the extract showed that the mRNA expression of MITF, tyrosinase, and TRP-1 was decreased. The data suggested a protective role for the Synsepalum dulcificum seed and leaf extracts against melanogenesis.

주제별 논단 : 한,중 금융협력의 법적 과제와 전망 ; 중국 증권시장 국제판 출시의 정책배경, 문제점과 해결방안

하소기 ( Shao Qi He ) 한국금융법학회 2012 金融法硏究 Vol.9 No.2

국제판은 중국 금융시장의 개혁개방이 계속 진행되고 중국 자본시장의 국제화가 가속되며 상해시가 경제모델을 세계금융센터로 전환하는 정책배경하에 제출하였다 그러나 현재 국제판은 많은 제반 법률문제와 장애를 당하였다. 이런 문제와 장애들은 중국 자본시장의 법치건설, 경제체제개혁, 금융시장개방 등과 연결하고 이 문제와 장애들을 해결하려면 시범을 이용하고 점차 관련 제도를 개혁, 개선하여야 한다. 그의 핵심적 문제는 자본시장의 효율성과 투자자의 신뢰감 문제를 해결하는 것이다. International Board is put forward under the background when China financial market reform and openness continuously deepen, the internationalization pace of China Capital market expedite and Shanghai work hard to fulfill its economic transformation and become the global finance center, but its pushing out faces many problems and obstacles. These inevitably relates to the construction of rule of law of Chinese capital market, the deepening of economic system reform and openness of finance market. Solutions to these problems and obstacles need recur to a pilot test project, gradually reform and improve the capital market efficiency and enhance the investors` confidence.

Evidence Based Analysis of Cisplatin for Treating Patients with Cutaneous Squamous Cell Carcinoma

Shao, Xiao-Hong,Xu, Yun-Sheng,Zhang, Xue-Qi,Li, Wen-Feng Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.22

Background: This analysis was conducted to evaluate the efficacy and safety of cisplatin based chemotherapy for treating patients with cutaneous squamous cell carcinoma. Methods: Clinical studies evaluating the efficacy and safety of cisplatin based regimens on response and safety for patients with cutaneous squamous cell carcinoma were identified using a predefined search strategy. Pooled response rates (RR) of treatment were calculated. Results: In cisplatin based regimens, 4 clinical studies which including 50 patients with advanced cutaneous squamous cell carcinoma were considered eligible for inclusion. Regimens included cisplatin, doxorubicin, or vindesine. Pooled analysis suggested that, in all patients, the pooled RR was 60% (30/50) in cisplatin based regimens. Nausea and vomiting were the main side effects. No grade III or IV renal or liver toxicity were observed. No treatment related death occurred with the cisplatin based treatments. Conclusion: Evidence based analysis suggests that cisplatin based regimens are associated with a good response rate and acceptable toxicity for treating patients with cutaneous squamous cell carcinoma.

Effect of Urbanization on Climate Change in Nanjing

Qi Ying Xiang,Yu Wenzheng,Shao Li,Chen Tianliang 보안공학연구지원센터 2014 International Journal of Smart Home Vol.8 No.1

Numerical Study of the Effect of Grout Material Properties on Ground Deformation during Shallow TBM Tunneling

Qi Zhang,Xiao-Ping Zhang,Hao-Jie Wang,Quan-Sheng Liu,Dan Xu,Shao-Hui Tang 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.8

The full-face shield tunnel boring machine (TBM) has been widely used to build tunnels in urban area. Ground deformations usually occur during tunnelling processes, which is closely related to engineering geological property. A large ground deformation may lead to large-scale surface settlement or ground collapse, especially for shallow buried tunnels. In general, synchronous grouting is adopted to reduce the ground deformation. The temporal and spatial distribution of the grout pressure and consolidation processes of grouting have a significant influence on the deformation. For a better understanding the relationship between the grout material type and the ground deformation, the present study models a complex numerical model in FLAC3D based on the Guangzhou Metro line 18. A numerical method is proposed to reproduce the tunnelling process and the consolidation process of grout material. The effect of grouting material on ground deformation is discussed, i.e., immediately solidified type, quick hardening type, and good mobility type. The ground deformation of the numerical simulation are compared to those monitored in the field. The results indicate that the immediately solidified type grout can reduce the ground settlement effectively and is mainly applicable to secondary grouting. The quick hardening type can make the ground upheaval, which is smaller than that induced by immediately solidified type. The good mobility type can reduce the ground settlement and well control the ground deformation. The good mobility type recommends using in the numerical study for simulating the synchronous grouting.

PRECONDITIONED AOR ITERATIVE METHODS FOR SOLVING MULTI-LINEAR SYSTEMS WITH 𝓜-TENSOR

QI, MENG,SHAO, XINHUI The Korean Society for Computational and Applied M 2021 Journal of applied mathematics & informatics Vol.39 No.3

Some problems in engineering and science can be equivalently transformed into solving multi-linear systems. In this paper, we propose two preconditioned AOR iteration methods to solve multi-linear systems with -tensor. Based on these methods, the general conditions of preconditioners are given. We give the convergence theorem and comparison theorem of the two methods. The results of numerical examples show that methods we propose are more effective.

Test on the anchoring components of steel shear keys in precast shear walls

Shao-Dong Shen,Peng Pan,Wen-Feng Li,Qi-Song Miao,Run-Hua Gong 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.24 No.6

Prefabricated reinforced-concrete shear walls are used extensively in building structures because they are convenient to construct and environmentally sustainable. To make large walls easier to transport, they are divided into smaller segments and then assembled at the construction site using a variety of connection methods. The present paper proposes a precast shear wall assembled using steel shear keys, wherein the shear keys are fixed on the embedded steel plates of adjacent wall segments by combined plug and fillet welding. The anchoring strength of shear keys is known to affect the mechanical properties of the wall segments. Loading tests were therefore performed to observe the behavior of precast shear wall specimens with different anchoring components for shear keys. The specimen with insufficient strength of anchoring components was found to have reduced stiffness and lateral resistance. Conversely, an extremely high anchoring strength led to a short-column effect at the base of the wall segments and low deformation ability. Finally, for practical engineering purposes, a design approach involving the safety coefficient of anchoring components for steel shear keys is suggested.

Recent Progress of Gr/Si Schottky Photodetectors

Qingguo Shao,Hao Qi,Chao Li,Kunpeng Cai,Jianxia Dong,Xuhui Liu,Ning Cao,Xiaobei Zang 대한금속·재료학회 2023 ELECTRONIC MATERIALS LETTERS Vol.19 No.2

By combing the carrier mobility of graphene with the excellent light absorption properties of silicon, ultra-shallow Schottkyjunction can be obtained, and can exist stably for a long time. The photoelectric property of Schottky junction is determinednot only by graphene and silicon semiconductor layer, but also by the interface layer between the two. Through a series ofoptimizations, the performance of graphene/silicon Schottky junction photodetectors can be continuously improved. Asa result, graphene/silicon Schottky junctions more promising for the development of next generation photodetectors withits stability, ease of preparation and sensitivity. In this review, we firstly give a brief introduction to Gr Schottky junctionphotodetectors, and then present a comprehensive review on the recent progress of optimizing Gr/Si Schottky junction photodetectorsin the past few years, including light management engineering, band engineering and interfacial engineering. Finally, the current challenges are summarized and further perspectives are outlined.