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Enhancement of Impurity, Machinability and Mechanical Properties in Te-Treated 0Cr18Ni9 Steel
Jian‑bo Xie,Tian Fan,Han Sun,Zhi‑qi Zeng,Jian‑xun Fu 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.6
To enhance the machinability and mechanical properties of 0Cr18Ni9 steel, free-machining element Te was introduced inthis work. By adding various quantities of Te to steel, several machining and tensile tests were carried out. Results show thatwith Te addition of 530 ppm, the number of inclusion sizes below 1 μm disappeared. With raising Te from 360 to 530 ppm,more MnTe–MnS inclusions of 10–40 μm were in spherical shape; above 50 μm2, the ratio of inclusion area at 530 ppmwas greatest among all, and the large-sized inclusions occupied a larger share. Te addition contributed to the surfaces ofmachining steels more smooth. The ultimate tensile strength of steel increased from 399 to 435 MPa. Te resulted in growthof sulfides and improved the machinability of steel.
Sun, Jian-Da,Chen, Chuang-Zhen,Chen, Jian-Zhou,Li, Dong-Sheng,Chen, Zhi-Jian,Zhou, Ming-Zhen,Li, De-Rui Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.5
Treatment responses of $N_0$ stage nasopharyngeal carcinoma were firstly analyzed comprehensively to evaluate long term outcomes of patients and identify prognostic factors. A total of 610 patients with $N_0$ NPC, undergoing definitive radiotherapy to their primary lesion and prophylactic radiation to upper neck, were reviewed retrospectively. Concomitant chemotherapy was administrated to 65 out of the 610. Survival rates of the patients were calculated using the Kaplan-Meier method and compared by log-rank test. Prognostic factors were identified by the Cox regression model. The study revealed the 5-year and 10-year overall, disease-free, disease-specific, local failure-free, regional failure-free, locoregional failure-free and distant metastasis-free survival rates to be 78.7% and 66.8%, 68.8% and 55.8%, 79.9% and 70.4%, 81.2% and 72.5%, 95.8% and 91.8%, 78.3% and 68.5%, 88.5% and 85.5%, respectively. There were 192 patients experiencing failure (31.5%) after radiotherapy or chemoradiotherapy. Of these, local recurrence, regional relapse and distant metastases as the first event of failure occurred in 100 (100/610, 16.4%), 15(15/610, 2.5%) and 52 (52/610, 8.5%), respectively. Multivariate analysis showed that T stage was the only independent prognostic factor for patients with $N_0$ NPC (P=0.000). Late T stage (P=0.000), male (P=0.039) and anemia (P=0.007) were independently unfavorable factors predicting disease-free survival. After treatment, satisfactory outcome wasgenerally achieved in patients with $N_0$ NPC. Local recurrence represented the predominant mode of treatment failure, while T stage was the only independent prognostic factor for overall survival. Late T stage, male gender, and anemia independently predicted lower possibility of the disease-free survival.
Preparation and Electromagnetic Properties of an Electromagnetic Wave Absorber
Sun Chang,Sun Kangning,Pang Laixue,Liu Jian 한국자기학회 2016 Journal of Magnetics Vol.21 No.1
In this study, we report the as-prepared MgO-doped BaFe12O19, which was prepared by calcination technique and high-energy ball milling process, as an electromagnetic wave absorber. The phase analysis of BaFe12O19 and the as-prepared MgO-doped BaFe12O19 was detected utilizing X-ray Diffractometer (XRD). The microstructure was characterized using Scanning Electron Microscope (SEM). By means of the transmission/reflection coaxial line method, the electromagnetic properties and microwave absorbing properties of the asprepared electromagnetic wave absorber were studied. It is found that the electromagnetic wave absorber has a minimum reflection loss value of –41 ㏈ at 4.27 ㎓ with a matching thickness of 2.6 ㎜. The experiment results revealed that the as-prepared electromagnetic wave absorber could find potential applications in many military as well as commercial industries.
How to Become an Elite Wushu (Kung-fu) Routine Athlete? Research on Development Factors
Jian Sun,Shali Hu,Xin Liu,May-Helen P. Stroemsmo 아시아건강운동학회 2019 Journal of Asian Society for Health & Exercise Vol.1 No.2
In order to know the developing pattern of the Wushu routine elite athletes, the research methods such as questionnaire, interview, case study and statistical analysis were used in this study. Through the study of the development of Chinese Wushu routine athletes, we found that there are five factors that influenced the developments of those athletes: the innate motivation, the external motivation, material guarantee, interpersonal environment and the choosing of opportunity. These five major key elements do not exist in isolation, but each take different proportion in different periods, and closely related and interact with each other. They have formed a dynamic open system.
Research on Characteristics of Excellent Wushu Routine Chinese Athletes in the Course of Growth
Jian Sun,Peifang Cao,Zhen Ma,Ruowei lv 아시아건강운동학회 2020 Journal of Asian Society for Health & Exercise Vol.2 No.2
With the National Wushu Team athletes for the study, documentation method and questionnaire method, methods such as interview and statistical methods, research and analysis concluded that top Chinese Wushu athletes grow up in the talent-time injury, transfer, achievement motivation, experience, growth, five demonstrated many of the distinctive features of the environment. For exploring and mastering regularity of excellent Wushu routine athletes " growth process of growing up, improving selection and training of Wushu athletes scientific, facilitate the development of more excellent athletes of Wushu routine players grew to offer theory reference.
Melatonin Attenuates Mitochondrial Damage in Aristolochic Acid-Induced Acute Kidney Injury
Sun Jian,Pan Jinjin,Liu Qinlong,Cheng Jizhong,Tang Qing,Ji Yuke,Cheng Ke,wang Rui,Liu Liang,Wang Dingyou,Wu Na,Zheng Xu,Li Junxia,Zhang Xueyan,Zhu Zhilong,Ding Yanchun,Zheng Feng,Li Jia,Zhang Ying,Yua 한국응용약물학회 2023 Biomolecules & Therapeutics(구 응용약물학회지) Vol.31 No.1
Aristolochic acid (AA), extracted from Aristolochiaceae plants, plays an essential role in traditional herbal medicines and is used for different diseases. However, AA has been found to be nephrotoxic and is known to cause aristolochic acid nephropathy (AAN). AA-induced acute kidney injury (AKI) is a syndrome in AAN with a high morbidity that manifests mitochondrial damage as a key part of its pathological progression. Melatonin primarily serves as a mitochondria-targeted antioxidant. However, its mitochondrial protective role in AA-induced AKI is barely reported. In this study, mice were administrated 2.5 mg/kg AA to induce AKI. Melatonin reduced the increase in Upro and Scr and attenuated the necrosis and atrophy of renal proximal tubules in mice exposed to AA. Melatonin suppressed ROS generation, MDA levels and iNOS expression and increased SOD activities in vivo and in vitro. Intriguingly, the in vivo study revealed that melatonin decreased mitochondrial fragmentation in renal proximal tubular cells and increased ATP levels in kidney tissues in response to AA. In vitro, melatonin restored the mitochondrial membrane potential (MMP) in NRK-52E and HK-2 cells and led to an elevation in ATP levels. Confocal immunofluorescence data showed that puncta containing Mito-tracker and GFP-LC3A/B were reduced, thereby impeding the mitophagy of tubular epithelial cells. Furthermore, melatonin decreased LC3A/B-II expression and increased p62 expression. The apoptosis of tubular epithelial cells induced by AA was decreased. Therefore, our findings revealed that melatonin could prevent AA-induced AKI by attenuating mitochondrial damage, which may provide a potential therapeutic method for renal AA toxicity.
Sun, Jian,Zhang, Shi-Jie,Li, Hai-Bo,Zhou, Wei,Hu, Wei-Xiao,Shan, Shang Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.5
Twenty two new 5-fluorouracil (5-FU) derivatives, 2-butoxy-4-substituted 5-fluoropyrimidines, were synthesized and characterized by IR, $^1H$ NMR, MS, HRMS. All compounds were preliminarily evaluated by MTT assay on human liver BEL-7402 cancer cell line in vitro. Ten compounds were selected to test their cytotoxic activity against A549, HL-60 and MCF-7 cancer cell lines in vitro. These compounds were more sensitive to BEL-7402 than other cell lines, particularly, cytotoxic activity of compounds 6b, 6d-f, 6p, 6s-u were in sub-micromolar scale. The highest cytotoxic potency against A549, HL-60 and MCF-7 was shown by 2-butoxy-4-chloro-5-fluoropyrimidine (5) with $IC_{50}$ values of 0.10, 1.66 and $0.59{\mu}M$, respectively. Compounds 6d and 6e were effective against MCF-7 with $IC_{50}$ $9.73{\mu}M$ and HL-60 with $IC_{50}$ $8.83{\mu}M$, respectively.
DESIGN AND IMPLEMENTATION OF LONG-DISTANCE SERIAL COMMUNICATION BASED ON WEB
SUN Jian-mei,ZHOU Da-yong 한국멀티미디어학회 2006 한국멀티미디어학회 국제학술대회 Vol.2006 No.-
With the development of the information industry such as internet and so on, Long-distance controlling on the intelligent equipment becomes the direction of the modem people's lives, Long-distance serial communication is good for researching. The paper discusses the long-distance serial communication Based on Web, it introduces the basic structure and the process of realization of the system, analyzes and realizes the software flow of the serial communication, presents the instance of the Long-distance controlling on the manipulator, the same time, it prospects the development of the long-distance based on the embedded system.
Stereo Vision based 3D Modeling System For Mobile Robot
Jian-Hong Sun,Byung-Seung Jeon,Jong-Wook Lim,Myo-taeg Lim 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
In this paper we will use stereo camera for 3D modeling of object in indoor environment. For mobile robot, navigation is a very important research area. Stereo vision can provide many information of the environment, and with these information robot can perform high level task. With our stereo vision system, firstly, we get disparity map from frames captured by the stereo camera. Then we extract the points of object from the frames, and convert these points to 3D coordinates. We select key points from the object points. Finally with these key points we build 3D model by our modeling system. Then we can get a virtual model of the objects in indoor environment.
POSITIVE SOLUTION FOR FOURTH-ORDER FOUR-POINT STURM-LIOUVILLE BOUNDARY VALUE PROBLEM
Sun, Jian-Ping,Wang, Xiao-Yun The Korean Society for Computational and Applied M 2010 Journal of applied mathematics & informatics Vol.28 No.3
This paper is concerned with the following fourth-order four-point Sturm-Liouville boundary value problem $u^{(4)}(t)=f(t,\;u(t),\;u^{\prime\prime}(t))$, $0\;{\leq}\;t\;{\leq}1$, ${\alpha}u(0)-{\beta}u^{\prime}(0)={\gamma}u(1)+{\delta}u^{\prime}(1)=0$, $au^{\prime\prime}(\xi_1)-bu^{\prime\prime\prime}(\xi_1)=cu^{\prime\prime}(\xi_2)+du^{\prime\prime\prime}(\xi_2)=0$. Some sufficient conditions are obtained for the existence of at least one positive solution to the above boundary value problem by using the well-known Guo-Krasnoselskii fixed point theorem.