PARTICULATE MATTER AND PARTICLE-BOUND PAHS EMISSIONS FROM GASOLINE DIRECT INJECTION (GDI) ENGINE WITH METHANOL-GASOLINE BLENDED FUEL DURING START

Wei Hong,Chao Yuan,Fangxi Xie,Yan Su,Jing Chen 한국자동차공학회 2018 International journal of automotive technology Vol.19 No.4

The effects of coolant’s temperature on emissions of particulate matters (PM) and particle-bound polycyclic aromatic hydrocarbons (PAHs) from a gasoline direct injection (GDI) engine were studied during the start process using gasoline (M0) and gasoline mixed with methanol in 15 % volume (M15). The engine worked at a certain idle speed automatically under different coolant’s temperature conditions after successful start. The experimental data was recorded from 0 to 40 seconds during the start. Results indicated that, there are significant differences in PM and particle-bound PAHs emissions between cold and warm start conditions. Particulate size distribution was measured with the Engine Exhaust Particle Sizer (EEPS) 3090. Compared with M0 fuel, the PM emission of M15 fuel decreased significantly, especially nucleation-mode particulate emission. The mass emission of PM was measured using the Gravimetric method. A same variation trend in PM mass emissions can be inferred for both fuels, i.e. it decreases while the coolant’s temperature increases. Compared with M0 fuel, the PM mass with M15 fuel reduces by 80 % at 20 oC coolant’s temperature. Agilent 7000B GC-QQQ was used to provide both qualitative and quantitative analysis on PAHs. The application of M15 fuel reduces the concentrations of most PAH species compared with M0 fuel, except those with smaller aromatic rings. In addition, Benzo(a)pyrene equivalent toxicity (BEQ) is calculated to evaluate the toxicity of PAHs emissions. The toxicity decreases when the GDI engine starts with higher coolant’s temperature or with M15 fuel.

Quantitative study on erosion degree of bone china glaze by common acid reagent at different temperature

Wei Hong,Wen-jie Li,Hui-chao Huang,Xiao-wei Weng,Yi-qin Zhang,Xiao-hui Liu,Yan-hua Guo,Ya-bin Su 한양대학교 청정에너지연구소 2022 Journal of Ceramic Processing Research Vol.23 No.6

In this experiment, we selected "Tangshan bone china" 10.5-inch white porcelain flat plate produced by five differententerprises as experimental samples to study the erosion of bone porcelain enamel by different kinds of acidic reagents atdifferent temperatures. The specific experimental process was as follows: at different temperatures, 20% hydrochloric acid,30% sulfuric acid, 100 g/L citric acid and 10% acetic acid were used to continuously erode the sample glaze for 10h, and thewhiteness and 45º mirror direction gloss were measured every 2h. The results show that different acidic reagents at differenttemperatures have significant differences in the erosion characteristics and strength of bone porcelain glaze, and the corrosionresistance of products from different enterprises also have significant differences.

Thermal Analysis Study of Modified Urea-Formaldehyde Resin

Wei Hong,Mianwu Meng,Dingding Gao,Qingye Liu,Caiyan Kang,Siyu Huang,Zhenming Zhou,Chunqiang Chen 한국고분자학회 2016 폴리머 Vol.40 No.5

In this study, the structures and thermal stability of pure urea-formaldehyde resin (PR) and modified urea-formaldehyde (UF) resin are investigated by differential thermal gravity (TG/DTG), and differential scanning calorimetry (DSC) supported by data from Fourier transform infrared spectroscopy. FTIR analysis indicate that the modifiers such as polydimethylsiloxane, dicyclohexylcarbodiimide and phenol have actively participated in the curing reactions. TG/DTG and DSC curve of UF resin show that its pyrolysis process is conducted in three steps: desiccation and dehydration, flash pyrolysis and slow decomposition. Compared with pure urea-formaldehyde resin (PR), modified UF resin exhibited good thermal stability. The activation energy (E) of modified UF resin acquired by Kissinger and Ozawa method was higher than that of PR. ΔH > 0, ΔS > 0 and ΔG > 0 in the thermal decomposition process of UF resin means that the decomposition reaction of UF resin before and after modification is a process of unnatural decalescence and entropy increase.

Research of Policy by Yunnan Public Security Authorities against Cross-border Trafficking in Women and Children

Wei Hong 아시아경찰학회 2007 아시아경찰학회 국제학술회의 Vol.2007 No.-

Under the background of economic globalization, human trafficking has already revealed the globalization trend, and cross-border crime of this kind has become one of the most important criminal crimes combated by international communities. As one of border provinces in China, Yunnan is facing such difficulties and troubles as case identification, evidence-gathering, as well as imperfect international collaboration mechanism. The public security authorities must take efforts to strengthen organizing and deployment, boost mechanism, launch special campaigns, promote border control, enhance international communication and cooperation, deter cross-border traffic in women and children, so as to continue to combat the crime and advance the efficiency.

Bioactive Metabolites from Brittle Star Ophipplocus japonicus

Weihong Wang,Jongki Hong,Chong-Ok Kee,Hee Young Cho,Sook Shin,Jee H. Jungs 한국생약학회 2004 Natural Product Sciences Vol.10 No.6

Multifunctional hydrogel delivery system for disease therapy

Weihong Mao,Qing Ji,Ping Chen,Zhengzou Fang,Xinyuan Li 한국고분자학회 2023 Macromolecular Research Vol.31 No.4

Hydrogel have been widely applied in the field of tissue engineering and disease therapy, because hydrogel can not only regenerate and repair damaged tissues, but also avoid unnecessary side effects as well as enhance the accumulation at lesions. The function of hydrogel mainly depended on the property of basic polymer materials. The nature-like tissue and environment-friendly characteristics of hydrogel are widely applied in disease therapy. Therefore, hydrogel was carefully designed from these biocompatible polymer materials through covalent and noncovalent crosslinking, and can be recognized as suitable scaffolds for tissue repair and regeneration. The obtained hydrogel can promote the transport of nutrients and oxygen through interconnected macropores. In addition, the physical and chemical crosslinking versatility of hydrogel can not only enhance its mechanical strength and adhesive property, but also can be used as a reservoir to realize sustain-release of drugs. Moreover, hydrogel can fill the irregular lesions sites, promote wound healing and bear the high-frequency motion of the lesion sites. In this paper, we will summarize some biocompatible hydrogels for some primary disease treatment, and provide some inspiration for researchers to design suitable hydrogel, so as to overcome the limitations of current disease treatment and promote the clinical transformation of hydrogel.

Preparation, Curing, and Properties of Boron-Containing Bisphenol-S Formaldehyde Resin/o-Cresol Formaldehyde Epoxy Resin/Nano-SiO2 Composites

Weihong Wu,Jingjing Leng,Zheng Wang,Hongqiang Qu,Jungang Gao 한국고분자학회 2016 Macromolecular Research Vol.24 No.3

Boron-containing bisphenol-S formaldehyde resin (BBPSFR) with different amounts of nano-SiO2 by in situ formation was used to cure o-cresol formaldehyde epoxy resin (o-CFER). The curing kinetics, dynamic mechanical properties, and thermal stability of BBPSFR/o-CFER/nano-SiO2 composites (BCS) were investigated by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), thermogravimetry (TG), and thermogravimetrymass spectrometry (TGMS). Morphology of nano-SiO2-containing BBPSFR and glass fiber laminates of the BCS were characterized by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The mechanical properties and electrical properties were also determined. The results showed that nano-SiO2 accelerated the curing process and decreased the curing temperature; the non-isothermal curing kinetics of the BCS can be described by the two-parameter (m, n) Šesták-Berggren kinetic model, and the average value of m was 0.32 and n was 1.00. The thermal stability was enhanced by the addition of nano-SiO2, especially at higher temperatures, and the residual weight increased with increasing nano-SiO2 content. Incorporation of 6 wt% of nano-SiO2 increased the impact strength from 105 to 149 kJ/m2 and storage modulus at ambient from 6.85 to 12.7 GPa, and the TEM photograph of which showed that nano-SiO2 particles (about 50 nm) were dispersed in the matrix more uniformly. The volume resistance, Rv, and dielectric constant, ε, slightly increased when the nano-SiO2 content was 3 wt%.

Catalytic mechanism and reaction pathway of acetone ammoximation to acetone oxime over TS-1

Weihong Xing,Zhaohui Li,Rizhi Chen,Wanqin Jin 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.5

A series of two-step reactions and several special experiments were designed and carried out to discover the reaction pathway of acetone ammoximation to acetone oxime over titanium silicalites-1 (TS-1) employing 25 wt%ammonia and 30 wt% hydrogen peroxide as the ammoximation agents. The experimental results show that the acetone oxime can form even if there is no direct contact between acetone and TS-1 catalysts, indicating the hydroxylamine route may be the most important catalytic mechanism for the reaction. HPLC, GC/MS and ion chromatography characterization results show that hydrogen peroxide can oxidize acetone oxime to acetone, nitrite and nitrate in the presence of TS-1. In addition, nitrite and nitrate can form in the reaction of H2O2 and NH3 over TS-1. Based on these results,a possible overall reaction pathway of acetone ammoximation over TS-1 has been proposed.

Towards an Integrated e-CRM Framework in Internet Shopping Mall

Weihong Zhao(조위굉),Changsu Kim(김창수),Jongmoo Park(박종무) 한국전자상거래학회 2006 전자상거래학회지 Vol.7 No.1

  웹에 기반하여 새로운 고객확보 보다는 우량고객의 이탈방지와 고객과의 커뮤니티 형성, 그리고 신규 고객획득을 위한 고객관계관리 능력의 개선을 통하여 신규 서비스 제공 및 이익 극대화를 가능케 하는 고객관계관리 (e-CRM)가 전자상거래에 있어 핵심적인 요소로 인식되고 있다. 고객관계관리는 고객과 관련된 기업의 내ㆍ외부 자료를 분석 통합하여 고객 특성에 맞는 고객경영 활동을 전개하는 것으로서 전자상거래 분야에서 가장 주목받고 있는 영역이기 때문이다. 본 연구는 인터넷 쇼핑몰을 이용하는 고객들과 장기적인 관계를 유지하는데 영향을 미치는 심리적인 요인들을 고려한 고객관계관리에 대한 통합적 틀(framework)을 제시하였다. 즉, 인터넷쇼핑몰을 이용하는 고객들에게 주요한 영향을 미치는 인지된 서비스 질, 인지된 제품 질, 그리고 인지된 가격 적정성과 같은 세가지 주요 요인과 가치, 만족, 신뢰 사이의 인과적인 연관관계를 이해할 수 있는 고객관계관리의 통합적 틀을 개발하였다. 본 연구에서 제안한 통합적 고객관계관리 틀은 현재 전자상거래에서 그 중요성이 날로 증대되고 있는 고객관계관리를 성공적으로 개발하고 구현하는데 있어 유용한 지침을 제공할 것이다.   Customer relationship management (e-CRM) is one of the fastest growing management approaches in electronic commerce. Based on customer cognitive, affective and conative experiences in Internet Shopping Mall, this study, from the customer perspective, develops an integrated framework for e-CRM to explain the psychological process that causes the customer to maintain long-term exchange relationships with specific Internet online retailers. The integrated framework proposes a series of causal linkages among the key variables of perceived value (as cognitive belief), satisfaction (as affective experience) and trust (as cognitive relationship intention), affecting customer commitment to specific Internet online retailers. As well, three key exogenous variables, that is perceived service quality, perceived product quality, and perceived price fairness are integrated into the integrated framework. The integrated framework highlights some managerial implications for successfully developing and implementing an e-CRM strategy.

Implicitly Parametric Curve

Weihong Zhang,Zhouwang Yang,Jiangsong Deng (사)한국CDE학회 2010 한국CAD/CAM학회 국제학술발표 논문집 Vol.2010 No.8

This paper proposes a new representation method of plane curves and develops a novel model in parameterization. Implicitly parametric curve is defined on the implicit curve and has a parametric form, which combines the advantages of parametric form and implicit form. For a given curve, the conversion among the implicit representation, parametric representation and implicitly parametric representation are provided. As the application of implicitly parametric curve, a parameterization method of closed implicit curves is addressed. We provide a model to construct an implicitly parametric curve for implicit curve, which is a smooth mapping from the standard shape to the implicit curve without overlap and satisfies some constraints. The implicitly parametric curve is obtained by solving the constrained minimization problem. An approach is provided to get the parameterization based on the implicitly parametric curve. Several examples are given to illustrate the effectiveness of the parameterization method.