Synthesis and NMR Characterization of Titanium and Zirconium Oxides Incorporated in SBA-15

Single oxides of Ti and Zr incorporated SBA-15 were prepared and characterized by N₂ adsorption, NMR, and XPS techniques. ²⁹Si MAS NMR results suggest the formation of Si–O–X linkages (X: Ti or Zr) by an increase in the ratio of Q ³/Q ⁴ in the presence of Ti or Zr. XPS analysis of Ti–SBA-15 catalysts indicate the presence of Ti–O–Si bonds in addition to Ti–O–Ti and Si–O–Si bonds, supporting the NMR evidence.     

Arrival rate estimation algorithm for single group slotted ALOHAsystems

In this letter, a new recursive tracking algorithm is presented that is capable of estimating the real arrival rate, λ_real , to the system. The estimated value of the arrival rate, λ _estimated, is used to dynamically adjust the control parameters of the system, hence ensuring that the operating point of the system is pushed toward the required settling point, whatever the real arrival rate to the system. This algorithm utilizes system information through the feedback channel in order to dynamically adjust the estimated value of the arrival rate and hence update the values of the control parameters     

Analysis and Semantic Querying in Large Biomedical Image Datasets

Biomedical image analysis plays an important role in diagnosing, prognosing, and treating complex diseases. The authors describe a set of techniques for analyzing, processing, and querying large image datasets using semantic and spatial information.     

Oxidation States and the Acidity of Ordered Arrays of Co–Pb Mixed Oxide Nanoparticles Templated in SBA15

Co, Pb and CoPb containing SBA15 mesoporous materials were prepared by direct synthesis method. When Co and Pb were loaded simultaneously, nanoparticles were formed in the channels of SBA15 as observed by transmission electron microscopy. These nanoparticles blocked the pores and decreased the apparent surface areas indicated by BET analysis. Pyridine adsorption on these catalysts revealed that while monometallic additions did not influence the overall acidity of SBA15, in the bimetallic system, characteristic bands due to pyridine adsorption on Co²⁺ ions were observed.     

e-Science, caGrid, and Translational Biomedical Research

Translational research projects target a wide variety of diseases, test many different kinds of biomedical hypotheses, and employ a large assortment of experimental methodologies. Diverse data, complex execution environments, and demanding security and reliability requirements make the implementation of these projects extremely challenging and require novel e-Science technologies.     

Mitochondria-Targeting Selenophene-Modified BODIPY-Based Photosensitizers for the Treatment of Hypoxic Cancer Cells

Two red-absorbing, water-soluble and mitochondria (MT)-targeting selenophene-substituted BODIPY-based photosensitizers (PSs) were realized ( BOD − Se , BOD − Se − I ), and their potential as photodynamic therapy (PDT) agents were evaluated. BOD − Se − I showed higher ¹O₂ generation yield thanks to the enhanced heavy-atom effect, and this derivative was further tested in detail in cell culture studies under both normoxic and hypoxic conditions. BOD − Se − I not only effectively functioned under hypoxic conditions, but also showed highly selective photocytotoxicity towards cancer cells. The selectivity is believed to arise from differences in mitochondrial membrane potentials of healthy and cancerous cells. To the best of our knowledge, this marks the first example of a MT-targeted BODIPY PS that functions under hypoxic conditions. Remarkably, thanks to the design strategy, all these properties where realized by a compound that was synthesized in only five steps with 32 % overall yield. Hence, this material holds great promise for the realization of next-generation PDT drugs for the treatment of hypoxic solid tumors.     

Joint drift analysis for multigroup slotted ALOHA: stability withmaximum utilization

In this paper, a slotted ALOHA system is considered where the users in the system are divided into two power groups. At the mobile base station, members of one group are received at a higher power level than those in the second group. This power division can be used to increase the overall throughput of the ALOHA system from 0.368 to 0.53. The two-group ALOHA system is stabilized by extending the idea of joint drift analysis, originally devised for a single group to the two-group case and the paper proposes a criterion for choosing a set of control parameters. The control parameter selection criterion guarantees one stable equilibrium point for each group, which enables the system to operate at the maximum throughput point. Combinations of the "optimal" control parameters are used to update the estimated number of users in the backlog, which is required in calculating the retransmission probability for users in each group. Simulation results demonstrate the superiority of the proposed control strategy over existing stability schemes