TECHNIQUES FOR QUADRIC SURFACE PROCESSING IN CAD

Tan, Jian Rong 대한전자공학회 1992 HICEC:Harbin International Conference on Electroni Vol.1 No.1

In this paper, we study techniques for quadric surfaces processing in CAD, which include implicit representation of quadric surfaces, approximate representation with cubic uniform B-SPLINE and accurate representation with NON UNIFORM RATIONAL B-SPLINE, and present an algorithm for $quot;inverse operation$quot; of cubic uniform B-SPLINE to describe quadric surfaces and an algorithm for finding the intersection between two quadric surfaces. A series of tests and applications show that these algorithms have many advantages, such as being simple, efficient and convenient.

<i>Premnagrandipaniculata</i> ( Lamiaceae , Premnoideae ), a remarkable new species from north Myanmar

Tan, Yun-Hong,Li, De-Rong,Zhou, Shi-Shun,Chen, Yong-Jun,Bramley, Gemma L.C.,Li, Bo Pensoft Publishers 2018 PhytoKeys Vol.94 No.-

<P>Abstract</P><P>A remarkable new <I>Premna</I> species from Myanmar, <I>P.grandipaniculata</I> Y.H.Tan & Bo Li (Lamiaceae), is here described and illustrated. It differs from all known congeneric taxa by having huge complicated panicles which have tertiary branches formed by spike-like thyrses. In <I>Premna</I>, such a spike-like thyrse is found in <I>P.bracteata</I> and <I>P.interrupta</I>, but those species can be easily distinguished from <I>P.grandipaniculata</I> by their habit, indumentum, leaf size and inflorescence structure.</P>

PREPARATION OF NANO-TATB BY SEMIBATCH REACTION CRYSTALLIZATION

XUE-RONG TAN,XIAO-HUI DUAN,CHONG-HUA PEI,HONG-LIN XU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.5

The 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) nanoparticles were prepared by using semibatch reaction crystallization method, and the influencing factors in close relationship with the grain size and crystal morphology control, such as the concentration of reaction system and categories of surfactants, were studied in this paper. The synthesized nano-TATB particles had been characterized by SEM, XRD, thermo gravimetric/differential scanning calorimetric (TG/DSC) and N2 physisorption. The grain size of TATB particles using nonionic surfactant as the additive ranged from 30 nm to 65 nm with a shape of spheres or ellipsoids. The broadening of the peaks and the weakening of the strength for nano-TATB were observed by XRD analysis. The corrected average particle size of nano-TATB was calculated using the Debye–Scherrer equation and the range was from 18 nm to 50 nm. TG and DSC curves revealed that thermal decomposition of nano-TATB occurred in the range of 361.5°C–385.0°C and its peak temperature was 373.7°C with a decrease of approximately 7°C compared with original TATB. Furthermore, the specific surface area (21.54 m2/g) of nano-TATB was calculated by BET method using N2 physisorption (at 77°C).

Self-assembled micelles of the natural medicine ginsenosides for cancer metastasis therapy

Xia-Rong Tan,Chao-Li,Ke-Ke Feng,Jing-Qing Le,Jiang-Wen Shen,Jing-Wei Shao 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-

The nanocarrier-based drug delivery systems have become an alternative strategy for cancer treatment. Whereas, increasing studies find that the utilization of drug carriers may result in poor biocompatibility,lower drug loading capacity and unpredictable side reactions. Therefore, we herein reported selfassembledmicelles based on herbal product ginsenosides, which are the main active ingredients ofPanax ginseng C.A. The ginsenosides-based micelle system exerts excellent biosafety, better stability, highdrug capacity, and lower cytotoxicity compared to free ginsenosides. Meanwhile, ginsenosides micellesexhibits superior inhibitory effects on cancer cell adhesion activity, especially the expression of intercellularadhesion molecule-1, which is the critical factor of cancer metastasis. Importantly, ginsenosidesmicelles results in remarkably therapeutic efficacy on lung metastasis of liver cancer. All these resultshighlight the potential utilization of ginsenosides micelles in the clinic. Meanwhile, the carrier-freenano-drugs self-delivery system of ginsenosides showed great promise to become an emerging approachfor cancer metastasis therapy.

TECHNIQUES FOR QUADRIC SURFACE PROCESSING IN CAD

Jian Rong Tan 대한전자공학회 1992 대한전자공학회 Conference Vol.1992 No.2

Visualizing test on the pass-through and collision characteristics of coarse particles in a double blade pump

Tan, Minggao,Lian, Yichao,Liu, Houlin,Wu, Xianfang,Ding, Rong The Society of Naval Architects of Korea 2018 International Journal of Naval Architecture and Oc Vol.10 No.1

As the key equipment in deep ocean mining, the slurry pump suffers from wear and blocking problems. In this paper, high-speed photography technique is applied to track the movement rule of single particle of the coarse particle solid-liquid two-phase flow in a double blade slurry pump. The influences of particle diameter and particle density on the pass-through and collision characteristics of particles are analyzed as well. The results show that the average of the passing pump time first decreases and then increases when the particle diameter increases. The average of the passing pump time decreases by 22.7%, when the particle density increases from $1.09g/cm^3$ to $1.75g/cm^3$. Besides, the particle density has great influence on the location where the particle hits the tongue. Most particles of $1.09g/cm^3$ hit the tongue on the left side, while collision location of particles of $1.75g/cm^3$ is mainly on the top and at the right side of the tongue. The research can provide a basis for the optimization design of slurry pump in deep ocean mining system.

Preoperative Adjacent Facet Joint Osteoarthritis Is Associated with the Incidence of Adjacent Segment Degeneration and Low Back Pain after Lumbar Interbody Fusion

Tan Lixian,Du Xiaokang,Tang Runmin,Rong Limin,Zhang Liangming 대한척추외과학회 2024 Asian Spine Journal Vol.18 No.1

Study Design: A retrospective cohort study. Purpose: To analyze the association between preoperative adjacent facet joint osteoarthritis (FJOA) and outcomes of lumbar interbody fusion (LIF). Overview of Literature: Whether preoperative adjacent FJOA is associated with the incidence of radiological adjacent segment degeneration (RASD) and low back pain (LBP) relief after lumbar fusion remains unknown. Methods: The study included patients who underwent LIF. The demographic characteristics and radiographic and surgical data were collected and evaluated. The included patients were divided into control group and FJOA group based on the preoperative adjacent facet joint Pathria grade. Preoperative and last follow-up LBP Visual Analog Scale (VAS) score, leg pain (LP) VAS, Oswestry Disability Index (ODI) and RASD were evaluated and compared. The improvement rates in VAS and ODI were calculated and compared between the two groups. Logistic regression was used to analyze the risk factors of LBP relief and incidence of RASD. Results: In total, 197 patients (control group, 86; FJOA group, 111) were included, and the median follow-up was 46 months. The VAS and ODI in both groups significantly improved after surgery. At the last follow-up, the FJOA group had higher VAS and lower VAS improvement rates of LBP than the control group (p<0.05). However, no significant difference in the LP VAS and ODI was found between the two groups. The incidence of RASD in the FJOA group was significantly higher than that in the control group (48.6% vs. 30.2%, p=0.034). Multivariate logistic regression analysis showed that preoperative adjacent FJOA was significantly associated with LBP relief (odds ratio [OR], 0.691; 95% confidence interval [CI], 0.498–0.958) and the postoperative incidence of RASD (OR, 1.406; 95% CI, 1.020–1.939). Conclusions: The preoperative FJOA in the adjacent segments was significantly associated with LBP following LIF. Patients with preoperative FJOA were more likely to have RASD following lumbar fusion surgery.

Challenges for commercializing perovskite solar cells

Rong, Yaoguang,Hu, Yue,Mei, Anyi,Tan, Hairen,Saidaminov, Makhsud I.,Seok, Sang Il,McGehee, Michael D.,Sargent, Edward H.,Han, Hongwei American Association for the Advancement of Scienc 2018 Science Vol.361 No.6408

<P>Perovskite solar cells (PSCs) have witnessed rapidly rising power conversion efficiencies, together with advances in stability and upscaling. Despite these advances, their limited stability and need to prove upscaling remain crucial hurdles on the path to commercialization. We summarize recent advances toward commercially viable PSCs and discuss challenges that remain. We expound the development of standardized protocols to distinguish intrinsic and extrinsic degradation factors in perovskites. We review accelerated aging tests in both cells and modules and discuss the prediction of lifetimes on the basis of degradation kinetics. Mature photovoltaic solutions, which have demonstrated excellent long-term stability in field applications, offer the perovskite community valuable insights into clearing the hurdles to commercialization.</P>

Preparation of bioactive nano-hydroxyapatite coating for artificial cornea

Run-Rong Lin,Xuan Mao,Qi-Cong Yu,Bai-Hua Tan 한국물리학회 2007 Current Applied Physics Vol.7 No.s1

Bioactive coatings containing hydroxyapatite(HA) nano crystals were prepared on PHEMA membrane by a sol dipping method.A cellcoating and the aggregation degree of HA particles inuence the adhesion of the cornea broblasts to the membrane, which dependsdramatically on the weight ratio between the nano-HA and the dispersant. The optimal condition of the coating preparation is with adispersant/HA = 1.25 weight ratio. The PHEMA membrane covered with nano-HA coating is promising for articial cornea use.

Imaging Cell Surface Glycans ofCardiomyocytes in Intact Rat Heart

Jie Rong,Jing Han,Lianshun Feng,Yanhong Tan,Qiwei Wang,Yingying Chen,Shiqiang Wang,Xing Chen 한국당과학회 2012 한국당과학회 학술대회 Vol.2012 No.1

Glycosylation is essential for proper cell signaling and embryonic development. Changes in glycosylation are often a hallmark of disease states. Cardiovascular disease has become one of the top causes of death. Many studies using rat models have related heart diseases and regulations of heart physiological functions to altered glycosylations. However, the dynamic regulation and molecular mechanism of glycosylation in heart are not clear. Rat is an important model organism for human cardiovascular disease studies. Isolated intact rat hearts are often used in physiological and pathological studies. In situ imaging biomolecules in intact heart avoid possible damage of myocyte and biased loss of cardiac myocytes during enzymatic isolation. Here, we applied the metabolic glycan labeling technique for imaging sialylation and O-linked glycosylation in living cardiomyocytes and intact rat hearts. The effects of unnatural sugars on the function of cardiomyocytes and hearts were evaluated. We found unnatural sugars did not perturb the function of cardiomyocytes and hearts. Glycan imaging revealed an interesting distribution pattern: sialic acid or O- linked glycan enriched at intercalated discs of adult rat cardiomyocytes. We also observed that the glycosylations of cardiomyocytes were altered in isoproterenol-induced cardiac hypertrophy rat models. This work extends the application of metabolic glycan labeling technique to probe glycosylations in rats and provides the first example of using this technique for in situ cellular glycans imaging in mammalian model organisms. The biological significance of altered glycosylations in cardiac hypertrophy heart is under investigation in our lab.