Recommended nuclear data for medical radioisotope production: diagnostic positron emitters

Tá,rká,nyi, F. T.,Ignatyuk, A. V.,Hermanne, A.,Capote, R.,Carlson, B. V.,Engle, J. W.,Kellett, M. A.,Kibé,di, T.,Kim, G. N.,Kondev, F. G.,Hussain, M.,Lebeda, O.,Luca, A.,Nagai, Y.,Na Springer-Verlag 2019 Journal of Radioanalytical and Nuclear Chemistry Vol.319 No.2

Phase structure and electromechanical behavior of Li, Nb co-doped 0.95Bi_0.5Na_0.5TiO₃-0.05BaZrO₃ ceramics

Hussain, A.,Maqbool, A.,Malik, R.A.,Lee, J.H.,Sung, Y.S.,Song, T.K.,Kim, M.H. Elsevier 2017 CERAMICS INTERNATIONAL Vol.43 No.suppl1

In this work, the effect of Li, Nb co-doping on the structural phase, dielectric, ferroelectric and field induced strain behavior of 0.95Bi<SUB>0.5</SUB>Na<SUB>0.5</SUB>TiO<SUB>3</SUB>-0.05BaZrO<SUB>3</SUB> (BNT-BZ5) ceramic was investigated. X-ray diffraction patterns revealed the formation of single phase perovskite structure in the studied composition range. However, with increasing Li, Nb co-doping concentration, the maximum dielectric constant decreased and the dielectric maximum temperature (T<SUB>m</SUB>) slightly shifted towards higher temperature. The field induced strain response increased from 0.18% for pure BNT-BZ5 to 0.38% for 1mol.% Li, Nb modified BNT-BZ5 sample. The corresponding dynamic piezoelectric coefficient for these composition were (S<SUB>max</SUB>/E<SUB>max</SUB> = 257pm/V) and (S<SUB>max</SUB>/E<SUB>max</SUB> = 542pm/V), respectively. These results suggest that the BNLTN-BZ ceramic can be considered as a promising candidate material for piezoelectric application.

Dielectric and Piezoelectric Properties of Ta-modified (K0.53Na0.47)(Nb0.8Ta0.2)O3 Ferroelectric Ceramics

Kim, J.S.,Kim, M.-H.,Hussain, A.,Park, T.G.,Park, J.,Chung, S.T.,Lee, H.S. Taylor Francis 2014 Ferroelectrics Vol.458 No.-

<P>Ta-substituted Na0.53K0.475Nb0.8Ta0.2O3 ceramics were prepared through the solid-state reaction method. The crystallized single phases were confirmed by X-ray diffraction. The temperature dependences of the dielectric and piezoelectric properties were investigated. Ta substitution in Na0.5K0.5NbO3 enhanced the piezoelectric property, and the corresponding piezoelectric coefficient was estimated to be d(33) = 160 pC/N. With increasing temperature, the planar electromechanical coupling coefficient (k(p) ) increased linearly up to the orthorhombic-tetragonal phase-transition temperature (TO-T ) and decreased as the temperature comes closer to the Curie temperature (T-c ).</P>

Field induced strain response of lead-free BaZrO₃-modified Bi_0.5Na_0.5TiO₃-BaTiO₃ ceramics

Rahman, J.U.,Hussain, A.,Maqbool, A.,Ryu, G.H.,Song, T.K.,Kim, W.J.,Kim, M.H. Elsevier Sequoia 2014 JOURNAL OF ALLOYS AND COMPOUNDS Vol.593 No.-

Lead-free (0.935-x)[Bi<SUB>0.5</SUB>Na<SUB>0.5</SUB>TiO<SUB>3</SUB>-0.065BaTiO<SUB>3</SUB>]-xBaZrO<SUB>3</SUB> (BNBT-xBZ, with x=0-0.07) ceramics were prepared by a conventional solid-state reaction method. The effect of BZ addition on the crystal structure, microstructure, dielectric, ferroelectric and electric field induced strain behavior of BNBT ceramic was investigated. X-ray diffraction patterns of BNBT-xBZ ceramics revealed the formation of single phase perovskite structure in the studied composition range. Addition of BZ in BNBT transform the crystal structure from tetragonal to pseudocubic symmetry. However, with increasing BZ content, the maximum dielectric constant decreased and the dielectric maximum temperature (T<SUB>m</SUB>) shifted towards lower temperature. The field induced strain response of BNBT-xBZ increases from 0.16% for x=0 to 0.38% for x=0.03, at an applied field of 7kV/mm. The corresponding dynamic piezoelectric coefficient for these composition were (S<SUB>max</SUB>/E<SUB>max</SUB>=231pm/V) and (S<SUB>max</SUB>/E<SUB>max</SUB>=542pm/V), respectively. These results suggest that the BNBT-0.03BZ ceramic can be considered as a promising candidate material for piezoelectric application.

Enhanced electromechanical properties of (1-x)BiFeO₃-BaTiO₃-xLiNbO₃ ceramics by quenching process

Ahmed Malik, R.,Hussain, A.,Kwon Song, T.,Kim, W.J.,Ahmed, R.,Soo Sung, Y.,Kim, M.H. Elsevier 2017 CERAMICS INTERNATIONAL Vol.43 No.suppl1

A new lead-free piezoelectric ceramics (1-x) (0.67Bi<SUB>1.05</SUB>FeO<SUB>3</SUB> - 0.33BaTiO<SUB>3</SUB>)-x LiNbO<SUB>3</SUB>, abbreviated as BFBT-LNx (x = 0.00-0.030), were fabricated by conventional mixed oxide route following by quenching process and crystal structure and electromechanical properties were discussed. X-ray diffraction pattern showed that LiNbO<SUB>3</SUB> addition into 0.67Bi<SUB>1.05</SUB>FeO<SUB>3</SUB> - 0.33BaTiO<SUB>3</SUB> system did not caused any significant change in crystal structure. However, an obvious variation in electrical properties was observed. It is revealed from electrical properties that the modification of LiNbO<SUB>3</SUB> induces a phase transition from a ferroelectric to relaxor state in the 0.67Bi<SUB>1.05</SUB>FeO<SUB>3</SUB> - 0.33BaTiO<SUB>3</SUB> system. At optimum composition (x = 0.010), enhanced field-induced strain with large dynamic piezoelectric constant S<SUB>max</SUB>/E<SUB>max</SUB> = d<SUP>*</SUP><SUB>33</SUB> = 500pm / V at a relatively low field of 3.5kV / mm with lower hysteresis loss of 40% was recorded. For this composition, a high Curie temperature T<SUB>C</SUB> ~ 390<SUP>o</SUP>C was found. These properties suggests that the synthesized system is promising for high temperature actuator applications.

Combined FTIR and Temperature Programmed Fischer-Tropsch Synthesis over Ru/SiO₂ and Ru-Ag/SiO₂ Supported Catalysts

Hussain, Syed T.,Nadeem, M. Arif,Mazhar, M.,Larachi, Faical Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.4

Combined temperature programmed reaction (TPR) and infrared (IR) spectroscopic studies for Fischer- Tropsch reaction have been performed over Ru/SiO2 and Ru-Ag/SiO2 supported catalysts. Reaction of linearly absorbed CO with hydrogen starts at 375 K over Ru/SiO2 catalyst and reaches maximum at 420 K accompanied with an intensity decrease of linear CO absorption. The reaction with bridged absorbed CO peaks around 510-535 K. Addition of Ag yields mixed Ru-Ag bimetallic sites while it suppresses the formation of bridged bonded CO. Formation of methane on this modified surface occurs at 390 K and reaches maximum at 444 K. Suppression of hydrogen on the Ag-doped surface also occurs resulting in the formation of unsaturated hydrocarbons and of CHx intermediates not observed with Ru/SiO2 catalyst. Such intermediates are believed to be the building blocks of higher hydrocarbons during the Fischer-Tropsch synthesis. Linearly absorbed CO is found to be more reactive as compared to bridged CO. The Ag-modified surface also produces CO2 and carbon. On this surface, hydrogenation of CO begins at 390 K and reaches maximum at 494 K. The high temperature for hydrogenation of absorbed CO and C over Ru-Ag/SiO2 catalyst as compared to Ru/SiO2 catalyst is due to the formation of Ru-Ag bimetallic surfaces impeding hydrogen adsorption.

Dehydration of Methanol to Dimethyl ether, Ethylene and Propylene over Silica-Doped Sulfated Zirconia

Hussain, Syed T.,Mazhar, M.,Gul, Sheraz,Chuang, Karl T,Sanger, Alan R. Korean Chemical Society 2006 Bulletin of the Korean Chemical Society Vol.27 No.11

Two types of catalyst samples were prepared, one sulfated zirconia and the other silica doped sulfated zirconia. The acidity tests indicate that sulfated zirconia doped with silica has higher concentration and strength of acidic catalyst sites than undoped sulfated zirconia. The acidic surface sites have been characterized using FTIR, NMR, pyridine adsorption, TPD, XRD and nitrogen adsorption. Doping with silica increased the concentration of surface Lewis and Brfnsted acid sites and resulted in generation of proximate acid sites.The activity test indicates that doping sulfated zirconia with silica increases both the acidity and catalytic activity for liquid phase dehydration of methanol at 413-453 K. Methanol is sequentially dehydrated to dimethyl ether and ethylene over both catalysts. Significant amounts of propylene are also formed over the silica-doped catalyst, but not over the undoped catalyst.

Combined FTIR and Temperature Programmed Fischer-Tropsch Synthesis over Ru/SiO2 and Ru-Ag/SiO2 Supported Catalysts

Syed T. Hussain*,M. Arif Nadeem,M. Mazhar,Faical Larachi 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.4

Combined temperature programmed reaction (TPR) and infrared (IR) spectroscopic studies for Fischer-Tropsch reaction have been performed over Ru/SiO2 and Ru-Ag/SiO2 supported catalysts. Reaction of linearly absorbed CO with hydrogen starts at 375 K over Ru/SiO2 catalyst and reaches maximum at 420 K accompanied with an intensity decrease of linear CO absorption. The reaction with bridged absorbed CO peaks around 510-535 K. Addition of Ag yields mixed Ru-Ag bimetallic sites while it suppresses the formation of bridged bonded CO. Formation of methane on this modified surface occurs at 390 K and reaches maximum at 444 K. Suppression of hydrogen on the Ag-doped surface also occurs resulting in the formation of unsaturated hydrocarbons and of CHx intermediates not observed with Ru/SiO2 catalyst. Such intermediates are believed to be the building blocks of higher hydrocarbons during the Fischer-Tropsch synthesis. Linearly absorbed CO is found to be more reactive as compared to bridged CO. The Ag-modified surface also produces CO2 and carbon. On this surface, hydrogenation of CO begins at 390 K and reaches maximum at 494 K. The high temperature for hydrogenation of absorbed CO and C over Ru-Ag/SiO2 catalyst as compared to Ru/SiO2 catalyst is due to the formation of Ru-Ag bimetallic surfaces impeding hydrogen adsorption.

Multi-model-based interactive authoring environment for creating shareable medical knowledge

Ali, T.,Hussain, M.,Ali Khan, W.,Afzal, M.,Hussain, J.,Ali, R.,Hassan, W.,Jamshed, A.,Kang, B.H.,Lee, S. Elsevier Science Publishers 2017 Computer methods and programs in biomedicine Vol.150 No.-

Objective: Technologically integrated healthcare environments can be realized if physicians are encouraged to use smart systems for the creation and sharing of knowledge used in clinical decision support systems (CDSS). While CDSSs are heading toward smart environments, they lack support for abstraction of technology-oriented knowledge from physicians. Therefore, abstraction in the form of a user-friendly and flexible authoring environment is required in order for physicians to create shareable and interoperable knowledge for CDSS workflows. Our proposed system provides a user-friendly authoring environment to create Arden Syntax MLM (Medical Logic Module) as shareable knowledge rules for intelligent decision-making by CDSS. Methods and materials: Existing systems are not physician friendly and lack interoperability and shareability of knowledge. In this paper, we proposed Intelligent-Knowledge Authoring Tool (I-KAT), a knowledge authoring environment that overcomes the above mentioned limitations. Shareability is achieved by creating a knowledge base from MLMs using Arden Syntax. Interoperability is enhanced using standard data models and terminologies. However, creation of shareable and interoperable knowledge using Arden Syntax without abstraction increases complexity, which ultimately makes it difficult for physicians to use the authoring environment. Therefore, physician friendliness is provided by abstraction at the application layer to reduce complexity. This abstraction is regulated by mappings created between legacy system concepts, which are modeled as domain clinical model (DCM) and decision support standards such as virtual medical record (vMR) and Systematized Nomenclature of Medicine - Clinical Terms (SNOMED CT). We represent these mappings with a semantic reconciliation model (SRM). Results: The objective of the study is the creation of shareable and interoperable knowledge using a user-friendly and flexible I-KAT. Therefore we evaluated our system using completeness and user satisfaction criteria, which we assessed through the system- and user-centric evaluation processes. For system-centric evaluation, we compared the implementation of clinical information modelling system requirements in our proposed system and in existing systems. The results suggested that 82.05% of the requirements were fully supported, 7.69% were partially supported, and 10.25% were not supported by our system. In the existing systems, 35.89% of requirements were fully supported, 28.20% were partially supported, and 35.89% were not supported. For user-centric evaluation, the assessment criterion was 'ease of use'. Our proposed system showed 15 times better results with respect to MLM creation time than the existing systems. Moreover, on average, the participants made only one error in MLM creation using our proposed system, but 13 errors per MLM using the existing systems. Conclusion: We provide a user-friendly authoring environment for creation of shareable and interoperable knowledge for CDSS to overcome knowledge acquisition complexity. The authoring environment uses state-of-the-art decision support-related clinical standards with increased ease of use.

Dehydration of Methanol to Dimethyl ether, Ethylene and Propylene over Silica-Doped Sulfated Zirconia

Syed T. Hussain*,M. Mazhar,Sheraz Gul,Karl T Chuang,Alan R. Sanger 대한화학회 2006 Bulletin of the Korean Chemical Society Vol.27 No.11

Two types of catalyst samples were prepared, one sulfated zirconia and the other silica doped sulfated zirconia. The acidity tests indicate that sulfated zirconia doped with silica has higher concentration and strength of acidic catalyst sites than undoped sulfated zirconia. The acidic surface sites have been characterized using FTIR, NMR, pyridine adsorption, TPD, XRD and nitrogen adsorption. Doping with silica increased the concentration of surface Lewis and Brfnsted acid sites and resulted in generation of proximate acid sites.The activity test indicates that doping sulfated zirconia with silica increases both the acidity and catalytic activity for liquid phase dehydration of methanol at 413-453 K. Methanol is sequentially dehydrated to dimethyl ether and ethylene over both catalysts. Significant amounts of propylene are also formed over the silica-doped catalyst, but not over the undoped catalyst.