Region of attraction estimation for saturated reset control systems

M. A. Davo,A. Banos,J. C. Moreno 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10

In this work, a new technique for the computation of the region of attraction for linear and time invariant systems controlled by a saturated reset control system is presented. The estimation of the region of attraction is based on a polytopic representation. In addition, the information of the solutions is synthesized in a directed graph formed by the polytopes. After presenting several useful conditions on the polytopes, such as positive invariance and convergence to the origin, a procedure is proposed to process the graph and obtain a region of attraction estimation. The effectiveness of the proposed technique is illustrated by a numerical example.

Polyaniline-engineered zinc sulphide nanocomposite as a highly efficient electrocatalyst for the oxygen evolution process

Alenad Asma M.,Fatima Sofia,Khalid Usman,Bano Nigarish,Abid Abdul Ghafoor,Manzoor Sumaira,Farid Hafiz Muhammad Tahir,Messali Mouslim,Alzahrani Huda A.,Taha Taha Abdel Mohaymen 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.5

Hydrogen is the ideal future fuel, since it is clean, saves energy, and is abundant in nature. Though there are several methods for producing hydrogen, only a few of them are environmentally friendly. To employ water electrolysis to make hydrogen and solve the energy shortage problem, highly active electrocatalysts must be created. Zinc sulphide/polyaniline (ZnS/PANI) nanocomposite was successfully produced using a straightforward two-step coprecipitation and polymerization procedure. Different analyses were used to characterize the fabricated materials. The findings show that the ZnS/PANI nanocomposite's morphology has a consistent porous shape, and the electrical structure of the active sites determines how well catalysts can make contact with the intermediates. Multiple attempts have been made to create the most affordable, functional electrocatalyst for oxygen evolution reactions (OER). However, clean energy production from such materials is sluggish. In comparison to pure PANI nanofibers (143.14 m2 g−1 and 0.4827 nm) and ZnS nanostructures (249.85 m2 g−1 and 0.4224 nm), the composite ZnS/PANI displays a greater Brunauer–Emmett–Teller (BET) surface area around 372.65 m2 g−1 along with nanoporous size of 0.393 nm due to the interaction, which provides distinctive features in contrast to ZnS and PANI. Synergistically, composite ZnS/PANI indicates lower overpotentials of 132 mV for oxygen evolution performance at 10 mA cm−2. An improved OER activity is observed by composite ZnS/PANIs as high current density, lower overpotential and reduced Tafel value of 53 mV dec−1. This catalyst also exhibited a significant double-layer capacitance and a large electrochemically active surface area. ZnS/PANI is a magnificent electrocatalyst for oxygen evolution.

Effectiveness of Different Cleaning Agents against the Colonization of Candida spp and the in Vitro Detection of the Adherence of These Yeast Cells to Denture Acrylic Surfaces

A. Dilek Nalbant,Ayse Kalkanci,Bano Filiz,Semra Kustimur 연세대학교의과대학 2008 Yonsei medical journal Vol.49 No.4

Purpose: The aim of this study is to examine the effect Klorhex and Fittydent, which are used as  cleaning agents on the adhesion of Candida on the surfaces of acrylic denture and palatal mucosa. In addition, ability of yeasts to adhere to acrylic strips was evaluated after applying these agents in vitro. Materials and Methods: Each group of 15 patients  cleaned their dentures with either Klorhex or with Fittydent. The control group cleaned their dentures  with water. Results: It was found that  62.2% of  the patients had colonies of Candida species on their palatal mucosa which was reduced to 51.1%  after using these cleaning agents. The colonization rate with Candida spp on their dentures  was reduces from  82.2% to  68.8%  using these cleaning agents.  The mean adhesion value of the Candida strains isolated from the acrylic strips were found to be 75cell/strip prior to applying the Klorhex and Fittydent  and 37.5cell/strip and 15cell/strip after  applying these agents, respectively. Conclusion: These results showed that Klorhex and Fittydent have a certain preventive effect on the colonization rate of Candida spp on the surface of these dentures, the palatal mucosa, as well as on the acrylic strips in vitro.

Final analysis of survival outcomes in the phase 3 FIRST trial of up-front treatment for multiple myeloma

Facon, Thierry,Dimopoulos, Meletios A.,Dispenzieri, Angela,Catalano, John V.,Belch, Andrew,Cavo, Michele,Pinto, Antonello,Weisel, Katja,Ludwig, Heinz,Bahlis, Nizar J.,Banos, Anne,Tiab, Mourad,Delforge American Society of Hematology 2018 Blood Vol.131 No.3

<P>This FIRST trial final analysis examined survival outcomes in patients with transplant-ineligible newly diagnosed multiple myeloma (NDMM) treated with lenalidomide and low-dose dexamethasone until disease progression (Rd continuous), Rd for 72 weeks (18 cycles; Rd18), or melphalan, prednisone, and thalidomide (MPT; 72 weeks). The primary endpoint was progression-free survival (PFS; primary comparison: Rd continuous vs MPT). Overall survival (OS) was a key secondary endpoint (final analysis prespecified >= 60 months' follow-up). Patientswere randomized to Rd continuous (n = 535), Rd18 (n = 541), or MPT (n = 547). At a median follow-up of 67 months, PFS was significantly longer with Rd continuous vs MPT (hazard ratio [HR], 0.69; 95% confidence interval [CI], 0.59-0.79; P < .00001) andwas similarly extended vs Rd18. Median OS was 10 months longer with Rd continuous vs MPT (59.1 vs 49.1 months; HR, 0.78; 95% CI, 0.67-0.92; P = .0023), and similar with Rd18 (62.3 months). In patients achieving complete or very good partial responses, Rd continuous had an approximate to 30-month longer median time to next treatment vs Rd18 (69.5 vs 39.9 months). Over half of all patients who received second-line treatment were given a bortezomib-based therapy. Second-line outcomes were improved in patients receiving bortezomib after Rd continuous and Rd18 vs after MPT. No new safety concerns, including risk for secondary malignancies, were observed. Treatment with Rd continuous significantly improved survival outcomes vsMPT, supporting Rd continuous as a standard of care for patients with transplant-ineligible NDMM.</P>

Facile synthesis of strontium selenide supported copper sulfide hybrid nanosheets as an efficient electrode for high-performance OER

Junaid Ali,Abdullah Muhammad,Bano Nigarish,Noreen Faiqa,Shah Syed Imran Abbas,Alshgari Razan A.,Mohammad Saikh,Manzoor Sumaira,Ehsan Muhammad Fahad,Ashiq Muhammad Naeem 한국세라믹학회 2024 한국세라믹학회지 Vol.61 No.3

To drive clean and sustainable fuel production via water electrolysis, development of high-performing, cost-eff ective elec- trocatalysts rich in earth elements without relying on precious metals or costly materials is crucial. In this study, strontium selenide (SrSe), copper sulfi de (CuS), and composite SrSe@CuS via a traditional coprecipitate method under alkaline con- ditions are synthesized. Characterization techniques including X-ray diff raction, Transmission electron microscopy, Field emission scanning electron microscopy, and Brunauer–Emmett–Teller surface area analysis are employed to analyze the structure, morphology, and surface characteristics. The larger surface area of 123  m 2  g−1 and lower crystalline size (46.43 nm) of SrSe@CuS nanosheets show more active sites for oxygen evolution reaction. The oxygen evolution activity displayed overpotentials of 290 mV, a lower tafel slope of 67 mV  dec −1, and Lower charge transfer resistance (RCT) values of SrSe@ CuS nanosheets (1.82 Ω) surpassing the individual SrSe and CuS nanosheets. Notably, the SrSe@CuS nanosheets exhibited remarkable stability, maintaining an oxygen evolution reaction (OER) activity of 10 mA  cm −2 for over 50 h and sustaining a negligible loss in performance even after 50,000 cycles of repetitive cyclivoltammetry scans. These fi ndings highlight their potential applicability in energy conversion and storage systems.

Deuterium ion irradiation impact on the current-carrying capacity of DI-BSCCO superconducting tape

Rajput M.,Swami H.L.,Kumar R.,Bano A.,Vala S.,Abhangi M.,Prasad Upendra,Kumar Rajesh,Srinivasan R. 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.7

In the present work, we have irradiated the DI-BSCCO superconducting tapes with the 100 keV deuterium ions to investigate the effect of ion irradiation on their critical current (Ic). The damage simulations are carried out using the binary collision approximation method to get the spatial distribution and depth profile of the damage events in the high temperature superconducting (HTS) tape. The point defects are formed near the surface of the HTS tape. These point defects change the vortex profile in the superconducting tape. Due to the long-range interaction of vortices with each other, the Ic of the tape degrades at the 77 K and self magnetic field. The radiation dose of 2.90 MGy degrades the 44% critical current of the tape. The results of the displacement per atom (dpa) and dose deposited by the deuterium ions are used to fit an empirical relation for predicting the degradation of the Ic of the tape. We include the dpa, dose and columnar defect terms produced by the incident particles in the empirical relation. The fitted empirical relation predicts that light ion irradiation degrades the Ic in the DI-BSCCO tape at the self field. This empirical relation can also be used in neutron irradiation to predict the lifetime of the DI-BSCCO tape. The change in the Ic of the DI-BSCCO tape due to deuterium irradiation is compared with the other second-generation HTS tape irradiated with energetic radiation