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1

Formation of the regularly arranged tubular pores during electrophoretic deposition

Lin C., Li W., Fang C., Wu Q., Xie H., Xu D., Xu B.

Materials Science Poland

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2017

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Vol. 35, No. 1

151--158

EN

The formation mechanism of regularly arranged tubular pores during an acid-based electrophoretic deposition (EPD) process was explored by studying the influence of gauze electrodes and suspension properties on the pore structures. The gauze electrodes can change the intensity of electrical field on the electrode surface, and thus control the pore locations. The mesh size not only restricts the ultimate pore size, but also determines the regularity of the pores. Under specific experimental conditions, a critical value of mesh size for attaining the regularity of the pores arrangement can be determined. Meanwhile, the pore structures can be controlled by a combination of pH value and zeta potential of the suspensions. The strength of the acidity is also one of the determinants to the final structures.

2

Enhanced Non-linear Viscoelastic Properties of Polymer Bonded Explosives Based on Graphene and a Neutral Polymeric Bonding Agent

Lin C., He G., Liu J., Pan L., Liu S.

Central European Journal of Energetic Materials

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2017

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Vol. 14, no. 4

788--805

EN

During their long-term storage and transport, polymer bonded explosives (PBXs) will be subjected to complex thermal physical environments with combined thermal and mechanical loads. The creep behaviour results in a change of physical and mechanical properties, which consequently influences the explosive performance. In this work, graphene and a neutral polymeric bonding agent (NPBA) were selected to improve the non-linear creep properties of 1,3,5-triamino-2,4,6-trinitrobenzene (TATB)-based PBXs. The results were compared with the creep response of the corresponding PBXs without additives and with graphene alone. It was observed that graphene and an NPBA exhibited a positive effect, improving the creep resistance of TATB-based PBXs. The compressive and tensile strength of 0.5 wt.% graphene-filled PBXs were improved by 5.1% and 29.2%, respectively, compared to raw TATB-based PBXs without additives. The performance of the PBXs was further enhanced by the addition of 0.1 wt.% NPBA. For a given stress and temperature, the TATB-based PBXs with graphene and NPBA deformed significantly less than the PBXs filled with graphene alone.

3

Wpływ minerałów ilastych na właściwości zaczynu cementowego z dodatkiem naftaleno-sulfonianu sodowego

Tan H., Lin C., Yang H., Ma B., Qi C., Li X.

Cement Wapno Beton

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2015

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R. 20/82, nr 3

193--200

PL

W pracy zbadano wpływ dodatku minerałów ilastych do cementu, a mianowicie kaolinitu i montmorillonitu na właściwości zaczynu z równoczesnym dodatkiem superplastyfikatora naftalenowego. Przeprowadzone doświadczenia wykazały, że adsorpcja plastyfikatora przez kaolinit i montmorillonit, badane za pomocą spektrometru promieniowania ultrafioletowego, była mniejsza niż cementu. Jednak szereg właściwości zaczynu uległo pogorszeniu, a szczególnie skurcz suszenia zaczynu cementowego zwiększył się, a wytrzymałość na ściskanie uległa zmniejszeniu. Wodożądność wzrosła bardzo znacznie, a konsystencja zaczynu uległa pogorszeniu. W podsumowaniu można stwierdzić, że należy unikać występowania w betonie minerałów ilastych, gdyż mają one niekorzystny wpływ na właściwości tego kompozytu.

EN

In the paper the investigations of the effect of clay minerals addition, namely kaolinite and montmorillonite, to cement on the properties of cement paste with sodium naphthalene sulfonate superplasticizer(NS) are presented. The studies have shown that the adsorption of NS by kaolinite and montmorillonite, determined by UV-VIS spectrophotometer, was lower than that of cement, but several cement paste properties were worse. Particularly the drying shrinkage of cement paste was increasing and the compressive strength was much lower as well as water demand was drastically increased and consistency of the paste was decreased. Summarizing the presence of clay minerals should be avoided in concrete because they have very disadvantage effect on the properties of this composite.

4

Influence of stearic acid on the structure and rheological behavior of injection-molded ZTA suspensions

Lin C., Wang B., Cheng Y., Wang C.

Materials Science Poland

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2013

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Vol. 31, No. 1

36-42

EN

The zirconia-toughened-alumina (ZTA) composite powder was exposed to a prior ball milling treatment with a small amount of stearic acid (SA) before the traditional blending process. The effect of different amounts of stearic acid on surface properties of the powder, the particle size distribution of the powder, and the rheological properties of the suspension were systematically studied within the design of experiments. Fourier transformation infrared spectroscopy (FTIR) analysis was used to prove the chemical interaction between the stearic acid and the ZTA powder. The effects of SA content on the particle sizes and their distribution were carefully examined. Rheological properties such as viscosity, yield stress, and power law exponent of the suspensions were determined within a temperature range of 140-170 °C. The optimal content of SA to improve the properties of the suspensions was found to be 3 wt.%.

5

An Improved Cop-Kmeans Clustering for Solving Constraint Violation Based on MapReduce Framework

Yang Y., Rutayisire T., Lin C., Li C., Teng F.

Fundamenta Informaticae

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2013

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Vol. 126, nr 4

301--318

EN

Clustering with pairwise constraints has received much attention in the clustering community recently. Particularly, must-link and cannot-link constraints between a given pair of instances in the data set are common prior knowledge incorporated in many clustering algorithms today. This approach has been shown to be successful in guiding a number of famous clustering algorithms towards more accurate results. However, recent work has also shown that the incorporation of must-link and cannot-link constraints makes clustering algorithms too much sensitive to “the assignment order of instances” and therefore results in consequent constraint violation. The major contributions of this paper are two folds. One is to address the issue of constraint violation in Cop-Kmeans by emphasizing a sequenced assignment of cannot-link instances after conducting a Breadth-First Search of the cannot-link set. The other is to reduce the computational complexity of Cop-Kmeans for massive data sets by adopting a MapReduce Framework. Experimental results show that our approach performs well on massive data sets while may overcome the problem of constraint violation.

6

User response to the simulation of a virtual patient with cranial nerve injury

Lin C., Laserna C, Lind D. S., Kalaria C, Aryal T, Lok B, Johnsen K, Kotranza A, Cendan J, Pruitt J. N.

Bio-Algorithms and Med-Systems

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2012

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Vol. 8, no. 1

1--12

EN

Technology has rarely attempted to simulate a CN exam. NERVE simulates a life-size virtual patient (VP), using speech recognition with a Nintendo Wiimote® serving as a virtual hand, ophthalmoscope, and eye-chart. This study assesses the introductory reception, ability to identify the CN lesion, and students' preference of NERVE. Our goal is to evaluate the responses from medical students, residents, and clinicians using the Neurological Examination Rehearsal Virtual Environment (NERVE), a cranial nerve (CN) exam simulator. Medical College of Georgia participants from a variety of medical specialties, including 9 clinicians, 7 residents, and 8 MS3 and 4s, 20 MS 2s, and 25 MS 1s performed a CN examination on a VP. There were no statistically significant differences in measures related to the actual performance of the exam, the controller, overall benefit of the experience, use of technology or satisfaction with the technology. Even with technical limitations, overall medical student's reported NERVE having educational value. Residents had the lowest rate of correct CN identification, indicating they could be the group that most benefits from repeat exposure to CN exams. Medical students and clinicians were the best groups at identifying the correct deficit for our simulation. The next step is to assess NERVE's capability to teach students and residents the cranial nerve exam.