Synthesis of a Potential Tumor Imaging Agent by Oxidative Radioiodination of Aspirin and Its Preclinical Study

Radiochemistry - Aspirin, one of nonsteroidal anti-inflammatory analgesic drugs, was labeled with 125I with a labeling yield of 85.5% under the following conditions: pH 9, 100 mg of the substrate,...     

Scaling merged single-device-well MOSFETs for very large scale integration

Single-Device-Well (SDW) MOSFETs are high density MOSFET structures based on merging two MOSFET devices; a surface channel device and a buried channel device sharing the same device well and the same gate. SDWs offer a potential device area saving of 50%. The merits of the merged SDW MOSFETs are further enhanced in a scaled down MOSFET VLSI technology. This is the subject of this paper.     

Individual differences in beliefs about groups.

The current research examined individual differences in peoples' positive versus negative beliefs about groups. Three studies were conducted to develop and validate a 16-item Beliefs About Groups (BAG) scale. Factor analyses in Studies 1 and 2 identified and replicated a 4-factor solution, with factors reflecting preferences for group versus individual work, positive group performance beliefs, negative group performance beliefs, and beliefs that others will work hard on group tasks. Study 2 also provided evidence for convergent and divergent validity, and explored relationships between the Big Five personality dimensions and group beliefs. Study 3 provided evidence for test–retest reliability. Across these 3 studies, the BAG scale had total score alphas ranging from .83 to .88. Implications of beliefs about groups for member motivation and group performance, as well as for future research and practice, are highlighted. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Mechanical properties of kenaf fiber reinforced concrete

This paper presents the findings of an experimental research program that was conducted to study the mechanical properties of a natural fiber reinforced concrete (FRC) which is made using the bast fibers of the kenaf plant. The kenaf plant is quickly developing as a replacement crop for the dwindling tobacco industry in the south-eastern United States. Appropriate mixture proportions and mixing procedures are recommended to produce kenaf FRC (KFRC) with fiber volume contents of 1.2% and 2.4%. The compressive strength, compressive modulus, splitting tensile strength and modulus of rupture of KFRC specimens are presented and compared to the properties of plain concrete control specimens. The experimental results indicate that the mechanical properties of KFRC are comparable to those of plain concrete control specimens, particularly when accounting for the effect of the increased w/c ratio required to produce workable KFRC. Further, the results indicate that KFRC generally exhibits more distributed cracking and higher toughness than plain concrete. Scanning electron micrographs (SEM’s) indicate that a good bond between the kenaf fibers and the surrounding matrix is achieved. The SEM’s also provide interesting information regarding the mechanisms which contribute to the failure and post-peak behavior of the KFRC which may be beneficial to future modeling efforts. The research findings indicate that KFRC is a promising ‘green’ construction material which could potentially be used in a number of different structural applications.     

Sustainable construction management: introduction of the operational context space (OCS)

Sustainable construction is an emerging field of science that aims at incorporating the general sustainable development concepts into conventional construction practices. While the foundation of knowledge in this field is continuously expanding, sustainable construction is not yet standard industry practice. One major technical barrier that hinders enacting sustainable construction is the absence of an application framework that integrates both sustainability and construction practices at an operational level. This shortcoming is being addressed through a three‐dimensional operational context space (OCS) that achieves the sought integration aspect. The three dimensions of OCS are: (1) project life cycle phases; (2) project executing entities; and (3) sustainability performance parameters. Such OCS facilitates the association of responsibility, by assigning each sustainability requirement to a specific project entity (or entities) during specific project phase(s), and further provides a numerical assessment for construction projects using sustainability as a criterion. Steps of constructing the OCS and how it could be employed in the evaluation and benchmarking of a project's environmental performance are examined, along with sample illustrations in the area of construction waste management.     

Spectrophotometric and atomic absorption spectrometric determination of certain cephalosporins

Two sensitive spectrophotometric and atomic absorption spectrometric procedures are developed for the determination of certain cephalosporins (cefotaxime sodium and cefuroxime sodium). The spectrophotometric methods are based on the charge-transfer complex formation between these drugs as n-donors and 7,7,8,8-tetracyanoquinodimethane (TCNQ) or p-chloranilic acid (p-CA) as pi-acceptors to give highly coloured complex species. The coloured products are measured spectrophotometrically at 838 and 529 nm for TCNQ and p-CA, respectively. Beer's law is obeyed in a concentration range of 7.6-15.2 and 7.1-20.0 microg x ml(-1) with TCNQ, 95.0-427.5 and 89.0-400.5 microg x ml-1 with p-CA for cefotaxime sodium and cefuroxime sodium, respectively. The atomic absorption spectrometric methods are based on the reaction of the above cited drugs after their alkali-hydrolysis with silver nitrate or lead acetate in neutral aqueous medium. The formed precipitates are quantitatively determined directly or indirectly through the silver or lead content of the precipitate formed or the residual unreacted metal in the filtrate by atomic absorption spectroscopy. The optimum conditions for hydrolysis and precipitation have been carefully studied. Beer's law is obeyed in a concentration range of 1.9-11.4 and 1.78-8.90 microg x ml(-1) with Ag(I), 14.2-57.0 and 13.3-53.4 microg x ml-1 with Pb(II) for cefotaxime sodium and cefuroxime sodium, respectively (for both direct and indirect procedures). The spectrophotometric and the atomic absorption spectrometric procedures hold well their accuracy and precision when applied to the analysis of cefotaxime sodium and cefuroxime sodium dosage forms.     

An evolutionary computing enriched RS attack resilient medical image steganography model for telemedicine applications

Multidimensional Systems and Signal Processing - The recent advancement in computing technologies and resulting vision based applications has given rise to a novel practice called telemedicine that...     

Poly I2L with deposited polysilicon collector

A new high speed high density poly I²L structure with deposited polysilicon collector is analyzed and modeled. The switching speed of the proposed poly I²L structure is 4 times higher than that of the conventional structures and the packing density is improved by a factor of 2.The proposed poly I²L structure is gnvestigated using a developed computer simulation model. Parameters sensitivity analysis of the structure is given. The minimum gate delay decreases as the intrinsic base sheet resistivity is increased and as the thin epitaxial layer under the base is decreased. Down scaling effects are discussed. It is shown that a lateral shift of PDP curves along the current axis is proportional to the change in the device area and the IR drop in npn base is proportional to the scaling factor.A structure with technology linewidth L = 2.5 μm exhibits minimum gate delay of 0.6 ns at 150 μA for fan-out F = 3, and a power-delay product of 30 fJ at low current levels. Simulation results are compared with experimental measurements performed on a given poly I²L structure and good agreement has been observed.     

An Efficient Image Steganography Approach over Wireless Communication System

Wireless Personal Communications - This paper presents a robust color image steganography approach for image communication over wireless communication systems. The objective of this approach is to...