Pose Measuring and Aligning of a Micro Glass Tube and a Hole on the Micro Sphere

Fu-Dong Li,De Xu,Zheng-Tao Zhang,Ya-Li Shi,Fei Shen 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.

To ensure high uniformity of the inner space of the hollow sphere after assembly, the glass tube must be inserted into the hole on thesphere towards the center of the sphere. This paper deals with the pose measuring of the hole on the sphere and the glass tube andpose aligning of the two objects. The sphere is 500 mm in diameter with a 20 mm hole on it, and the glass tube is 17 mm in diameter. Novel pose measuring method for the hole on the sphere and the glass tube is developed, using two microscopic cameras, each oneacquires a projection vector of the object to be measured. A plane containing the optical axis of the microscopic camera and the posevector of the object is determined, with the microscopic camera calibrated in advance. Pose vector of the object to be measured canbe calculated by the intersection of the two planes acquired by the two microscopic cameras. Error analysis of the pose measuringmethod is conducted and experimental results were consistent with analytical results. Less than 0.7o pose aligning error is achievedusing the proposed pose measuring method and pose aligning method.

Preparation of Si3N4 powder by combustion synthesis

Jin-fu Li,Kang Li,Guo-bin Li,Dong-ming Yan 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.3

The present paper addresses a possible route for the manufacturing of silicon nitride (Si3N4) powder under rather a low pressure of nitrogen using a combustion synthesis (CS) method. Reactant mixtures were diluted by 30-50 wt% of Si3N4 to avoid the melting of silicon during combustion. Si3N4 powders with α/(α + β) ratios were prepared in a loose powder mixture state in the temperature range of 1500-2200 oC with dwell times from 10 to 60 minutes. The influence of the amount of ammonium fluoride (NH4F) in the mixture with silicon, the silicon particle size distribution, and the nitrogen pressure on the extent of silicon conversion into silicon nitride was experimentally studied. It was revealed that a small ammonium fluoride addition to silicon powder allowed the production of silicon nitride powder with a good output for industrialization. Because of the existence of the NH4F, the reaction involves not only the silicon nitriding mechanism, the growth of α-Si3N4 occurred partially by a vapor-crystal growth mechanism, and a vapor-liquid-solid (VLS) mechanism works during the rod-like β-Si3N4 growth. The as-synthesized samples were characterized using X-ray diffraction and scanning electron microscopy analyses. Possible mechanisms of CS Si3N4 particle growth are discussed. CS technology has the advantage over traditional technology in simple equipments, low cost, high quality and relative good sintering activity. The present paper addresses a possible route for the manufacturing of silicon nitride (Si3N4) powder under rather a low pressure of nitrogen using a combustion synthesis (CS) method. Reactant mixtures were diluted by 30-50 wt% of Si3N4 to avoid the melting of silicon during combustion. Si3N4 powders with α/(α + β) ratios were prepared in a loose powder mixture state in the temperature range of 1500-2200 oC with dwell times from 10 to 60 minutes. The influence of the amount of ammonium fluoride (NH4F) in the mixture with silicon, the silicon particle size distribution, and the nitrogen pressure on the extent of silicon conversion into silicon nitride was experimentally studied. It was revealed that a small ammonium fluoride addition to silicon powder allowed the production of silicon nitride powder with a good output for industrialization. Because of the existence of the NH4F, the reaction involves not only the silicon nitriding mechanism, the growth of α-Si3N4 occurred partially by a vapor-crystal growth mechanism, and a vapor-liquid-solid (VLS) mechanism works during the rod-like β-Si3N4 growth. The as-synthesized samples were characterized using X-ray diffraction and scanning electron microscopy analyses. Possible mechanisms of CS Si3N4 particle growth are discussed. CS technology has the advantage over traditional technology in simple equipments, low cost, high quality and relative good sintering activity.

Morphological Factors and Cardiac Doses in Whole Breast Radiation for Left-sided Breast Cancer

Guan, Hui,Dong, Yuan-Li,Ding, Li-Jie,Zhang, Zi-Cheng,Huang, Wei,Liu, Cheng-Xin,Fu, Cheng-Rui,Zhu, Jian,Li, Hong-Sheng,Li, Miao-Miao,Li, Bao-Sheng Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.7

Background: To investigate the impact of the breast size, shape, maximum heart depth (MDH), and chest wall hypotenuse (the distance connecting middle point of the sternum and the length of lung draw on the selected transverse CT slice) on the volumetric dose to heart with whole breast irradiation (WBI) of left-sided breast cancer patients. Materials and Methods: Fifty-three patients with left-sided breast cancer undergoing adjuvant intensity-modulated radiotherapy (IMRT) were enrolled in the study. The primary breast size and shape, MHD and DCWH (chest wall hypotenuse) were contoured on radiotherapy (RT) planning CT slices. The dose data of hearts were obtained from the dose-volume histograms (DVHs). Data were analyzed by one-way analysis of variance (ANOVA), Student's t-test and linear regression analysis. Results: Breast size was independent of heart dose, whereas breast shape, MHD and DCWH were correlated with heart dose. The shapes of breasts were divided into four types, as the flap type, hemisphere type, cone type and pendulous type with heart mean dose being $491.8{\pm}234.6cGy$, $752.7{\pm}219.0cGy$, $620.2{\pm}275.7cGy$, and $666.1{\pm}238.0cGy$, respectively. The flap type of breasts shows a strong statistically reduction in heart dose, compared to others (p=0.008 for V30 of heart). DCWH and MHD were found to be the most important parameters correlating with heart dose in WBI. Conclusions: More attention should be paid to the heart dose of non-flap type patients. The MHD was found to be the most important parameter to correlate with heart dose in tangential WBI, closely followed by the DCWH, which could help radiation oncologists and physicsts evaluate heart dose and design RT plan in advance.

Association Between MDM2 SNP309 T>G and Risk of Gastric Cancer: A Meta-analysis

Tian, Xin,Tian, Ye,Ma, Ping,Sui, Cheng-Guang,Meng, Fan-Dong,Li, Yan,Fu, Li-Ye,Jiang, Tao,Wang, Yang,Ji, Fu-Jian,Fang, Xue-Dong,Jiang, You-Hong Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.3

Background: As a negative regulator of P53, MDM2 plays an important role in carcinogenesis; a polymorphism in its promoter region. SNP309 T>G, is known to increase the expression of MDM2, thus being considered related to higher susceptibility to neoplasia. However, no agreement has been achieved regarding its effects on gastric cancer. Methods: The present systematic meta-analysis was performed based on comprehensive literature search from Pubmed, Web of science and CBM databases. Results: It was suggested from 6 independent studies that the GG genotype is associated with a significantly increased risk of gastric cancer (Recessive: OR = 1.43, 95% CI = 1.08-1.91, P = 0.013), and subgroup analysis also confirmed the relationship (English publications-recessive model: OR = 1.45, 95% CI = 1.10-1.91, P = 0.009; Studies in China-recessive model: OR = 1.58, 95% CI = 1.08-2.30, P = 0.017). No publication bias was detected. Conclusion: The meta-analysis indicated a significant inverse association between GG genotype carriage and elevated risk of gastric cancer. However, more studies and detailed information are needed to fully address the topic.

Preparation and Catalytic Performance of Amidoximated Polyacrylonitrile Bimodal Nanofiber Iron Complexes

Fu Li,Pengfei Fei,Yongchun Dong,Man Zhang,Yu Feng,Shuqiang Liu,Lu Jia,Hulin Zhang,Zhen Ni 한국섬유공학회 2022 Fibers and polymers Vol.23 No.5

To balance the specific surface area and porous structure of nanofibrous heterogeneous Fenton catalyst for therapid transfer of dye molecules during dye-containing wastewater treatment, a polyacrylonitrile nanofiber with bimodaldiameter distribution (n-PAN-D) was prepared and amidoximated, followed by coordinating with Fe3+ ion (Fe-AO-n-PAND). The modification and coordination process hardly changed the fiber morphology and bimodal diameter distribution ofnanofiber membrane. The amidoximated degree of n-PAN-D increased with the increase of the diameter difference, and thecoordination ability of amidoximated n-PAN-D decreased with increasing the diameter difference. Fe-AO-n-PAN-D hadbetter catalytic activity than those with similar thick or thin nanofiber diameters due to the rapid mass transfer of dyemolecules in the catalyst. The possible oxidation and degradation pathway of Reactive Red 195 in the Fe-AO-n-PAN-D/H2O2system was proposed. And the series of reactions may not gradually occur because of the non-selective oxidation of ·OH. Thegood reusability of Fe-AO-n-PAN-D made it potential carrier for heterogeneous Fenton catalyst in wastewater treatment.

Unusual Motion Detection for Vision-Based Driver Assistance

Fu, Li-Hua,Wu, Wei-Dong,Zhang, Yu,Klette, Reinhard Korean Institute of Intelligent Systems 2015 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.15 No.1

For a vision-based driver assistance system, unusual motion detection is one of the important means of preventing accidents. In this paper, we propose a real-time unusual-motion-detection model, which contains two stages: salient region detection and unusual motion detection. In the salient-region-detection stage, we present an improved temporal attention model. In the unusual-motion-detection stage, three kinds of factors, the speed, the motion direction, and the distance, are extracted for detecting unusual motion. A series of experimental results demonstrates the proposed method and shows the feasibility of the proposed model.

Unusual Motion Detection for Vision-Based Driver Assistance

Li-hua Fu,Wei-dong Wu,Yu Zhang,Reinhard Klette 한국지능시스템학회 2015 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.15 No.1

For a vision-based driver assistance system, unusual motion detection is one of the important means of preventing accidents. In this paper, we propose a real-time unusual-motion-detection model, which contains two stages: salient region detection and unusual motion detection. In the salient-region-detection stage, we present an improved temporal attention model. In the unusual-motion-detection stage, three kinds of factors, the speed, the motion direction, and the distance, are extracted for detecting unusual motion. A series of experimental results demonstrates the proposed method and shows the feasibility of the proposed model.

Combined Administration of the Mixture of Honokiol and Magnolol and Ginger Oil Evokes Antidepressant-like Synergism in Rats

Li-Qin Qiang,Ling-Dong Kong,Cai-Ping Wang,Fu-Meng Wang,Ying Pan,Li-Tao Yi,Xian Zhang 대한약학회 2009 Archives of Pharmacal Research Vol.32 No.9

Magnolia bark combined with ginger rhizome is a common drug pair in traditional Chinese prescriptions for the treatment of depression. In the present study, we examined antidepressant-like effects of the mixture of honokiol and magnolol (HMM) from magnolia bark and essential oil from ginger rhizome (OGR) alone and in combination in chronic unpredictable mild stress (CUMS) of rats. Behavioral (sucrose intake, immobility time of forced swimming test) and biochemical parameters [serotonin (5-HT) in prefrontal cortex, hippocampus, and striatum, gastric mucosa cholecystokinin (CCK) and serum gastrin (GAS) levels] were simultaneously examined in the CUMS rats. 20 mg/kg HMM alone, but not OGR, significantly increased sucrose intake and reduced immobility time in the CUMS rats. Moreover, 20 mg/kg HMM and 14 mg/kg OGR in combination exhibited significant synergistic effects on sucrose intake increase and immobility time reduction in the CUMS rats. HMM elevated 5-HT levels in various brain regions, and OGR reduced gastric mucosa CCK and serum GAS levels in the CUMS rats. These results suggested that the synergistic antidepressant-like effects of compatibility of HMM with OGR might be mediated simultaneously by regulation of the serotonergic and gastroenteric system functions. These findings also provided a pharmacological basis for the clinical application of this drug pair of magnolia bark and ginger rhizome in traditional Chinese medicine.

Au/Titania Composite Nanoparticle Arrays with Controlled Size and Spacing by Organic-Inorganic Nanohybridization in Thin Film Block Copolymer Templates

Li, Xue,Fu, Jun,Steinhart, Martin,Kim, Dong-Ha,Knoll, Wolfgang Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.6

A simple approach to prepare arrays of Au/TiO2 composite nanoparticles by using Au-loaded block copolymers as templates combined with a sol-gel process is described. The organic-inorganic hybrid films with closely packed inorganic nanodomains in organic matrix are produced by spin coating the mixtures of polystyrene-block-poly(ethylene oxide) (PS-b-PEO)/HAuCl4 solution and sol-gel precursor solution. After removal of the organic matrix with deep UV irradiation, arrays of Au/TiO2 composite nanoparticles with different compositions or particle sizes can be easily produced. Different photoluminescence (PL) emission spectra from an organic-inorganic hybrid film and arrays of Au/TiO2 composite nanoparticles indicate that TiO2 and Au components exist as separate state in the initial hybrid film and form composite nanoparticles after the removal of the block copolymer matrix.

Effective removal of anilines using porous activated carbon based on ureaformaldehyde resin

Fu-Qiang An,Dong Zhang,Xiao-Xia Yue,Guo-Li Ou,Jian-Feng Gao,Tuo-Ping Hu 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.2

The effective removal of aniline and its derivatives from wastewater is very important due to the high toxicity. Adsorption with a high-performance adsorbent is an efficient pathway. A novel activated carbon, ACUF-700, was synthesized using homemade ureaformaldehyde resin as the major carbon source carbonized at 700 oC. ACUF-700 is characterized by surface area analyzer, FTIR, elemental analyzer, and SEM. The adsorption properties of ACUF-700 towards anilines are also investigated by using batch methods. The test results showed that the ACUF-700 possesses higher specific surface area and narrower pore size distribution. In virtue of its developed pore structure and nitrogencontaining chemical groups, the adsorption capacities towards aniline, p-toluidine and p-chloroaniline could reach 95.6, 108.1 and 128.9mg/g, respectively. The adsorption process could be well described by the intra-particle mass transfer diffusion model and Sips model. Besides, ACUF700 was regenerated easily using diluted hydrochloric acid solution as eluent and ACUF700 possesses better reusability.