排序方式: 共有35条查询结果,搜索用时 15 毫秒
11.
Rui Du Chuantao Wang Li Guo Razium Ali Soomro Bin Xu Chunming Yang Feng Fu Danjun Wang 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(39):2302330
Selective oxidation of biomass-based molecules to high-value chemicals in conjunction with hydrogen evolution reaction (HER) is an innovative photocatalysis strategy. The key challenge is to design bifunctional photocatalysts with suitable band structures, which can achieve highly efficient generation of high-value chemicals and hydrogen. Herein, NiS/Cd0.6Zn0.4S Schottky junction bifunctional catalysts are constructed for sunlight-driven catalytic vanillyl alcohol (VAL) selective oxidation towards vanillin (VN) coupling HER. At optimal conditions, the 8% NiS/Cd0.6Zn0.4S photocatalyst achieves high activity of VN production (3.75 mmol g−1 h−1) and HER (3.84 mmol g−1 h−1). It also exhibits remarkable VAL conversion (66.9%), VN yield (52.1%), and selectivity (77.8%). The photocatalytic oxidation of VAL proceeds a carbon-centered radical mechanism via the cleavage of αC–H bond. Experimental results and theoretical calculations show that NiS with metallic properties enhances the electron transfer capability. Importantly, a Ni-S-Cd “electron bridge” formed at the interface of NiS/Cd0.6Zn0.4S further improves the separation/transfer of electrone/h+ pairs and also furnishes HER active sites due to its smaller the |ΔGH*| value, thereby resulting in a remarkably HER activity. This work sheds new light on the selective catalytic oxidation VAL to VN coupling HER, with a new pathway towards achieving its efficient HER efficiency. 相似文献
12.
Taher M. Ghazal Marrium Anam Mohammad Kamrul Hasan Muzammil Hussain Muhammad Sajid Farooq Hafiz Muhammad Ammar Ali Munir Ahmad Tariq Rahim Soomro 《计算机、材料和连续体(英文)》2021,69(1):191-203
Hepatitis C is a contagious blood-borne infection, and it is mostly asymptomatic during the initial stages. Therefore, it is difficult to diagnose and treat patients in the early stages of infection. The disease’s progression to its last stages makes diagnosis and treatment more difficult. In this study, an AI system based on machine learning algorithms is presented to help healthcare professionals with an early diagnosis of hepatitis C. The dataset used for our Hep-Pred model is based on a literature study, and includes the records of 1385 patients infected with the hepatitis C virus. Patients in this dataset received treatment dosages for the hepatitis C virus for about 18 months. A former study divided the disease into four main stages. These stages have proven helpful for doctors to analyze the liver’s condition. The traditional way to check the staging is the biopsy, which is a painful and time-consuming process. This article aims to provide an effective and efficient approach to predict hepatitis C staging. For this purpose, the proposed technique uses a fine Gaussian SVM learning algorithm, providing 97.9% accurate results. 相似文献
13.
Shiwei Ma Shiyi Chen Ahsanullah Soomro Min Zhu Wenguo Xiang 《International Journal of Hydrogen Energy》2018,43(6):3154-3164
Fe2O3 is currently the most proper active metal oxide for chemical looping hydrogen generation (CLHG). However, supports are necessary to improve the reactivity and redox stability. CeO2 can enhance the oxygen mobility, leading to high redox reactivity and carbon deposition resistance, which can be an excellent alternative support for oxygen carriers. In this paper, Fe2O3/CeO2 oxygen carriers prepared by the co-precipitation method with different Fe2O3 loadings were investigated on a batch fluidized bed regarding the hydrogen yield and purity, redox reactivity and stability in CLHG with CO as fuel. The results showed that Fe6Ce4 is the best given comprehensive performance with no CO or CO2 observed in the obtained hydrogen (detection limit 0.01% in volume). The oxygen mobility property for the reducible support CeO2 and the physical contact between un-integrated Fe2O3 and CeO2 could improve the reduction of Fe2O3. In addition, the formation of the hematite-like solid solution and perovskite-type CeFeO3 could bring about abundant oxygen vacancies and promote the oxygen mobility, which contributes to the elimination of carbon deposition, counteracts the negative effect of serious sintering and guarantees the reactivity and redox stability of the Fe2O3/CeO2 oxygen carriers. The Fe2O3/CeO2 oxygen carriers were characterized by carbon monoxide temperature-programmed reduction measurement and X-ray diffraction patterns, and Fe6Ce4 was also selected to be characterized by scanning electron microscopy images and energy dispersive X-ray spectrometer analysis. 相似文献
14.
Biomass gasification for hydrogen rich syngas production was investigated using the Fe/CaO catalysts in a fluidized bed reactor. The synthesized catalysts were prepared by an impregnation method with different Fe/CaO mass ratios (5%, 10%, 15%, 20%) for enhancing H2 concentration and syngas yields and then characterized using X-ray diffraction (XRD), nitrogen adsorption and desorption isotherms test, scanning electron microscopy (SEM) and CO2 absorption capacity test. The results showed that the Fe load had significant influences on the composition, textural properties and CO2 adsorption capacity. Results of gasification experiments verified that the presence of Fe enhanced the concentration and yield of H2. The highest syngas yield of 38.21 mol/kg biomass, H2 yield of 26.40 mol/kg biomass, LHV values of 8.69 MJ/kg and gasification efficiency of 49.15% were obtained at an optimized mass ratio of Fe/CaO = 5%. In addition, the characterization results indicated that Ca2Fe2O5 phase was formed. The Ca2Fe2O5 had less CO2 absorption capacity and effect on the gasification, but was considered to be a catalyst for tar cracking thus preventing the CaO deactivation. 相似文献
15.
This paper proposes a new approach for solving the bearings-only target tracking (BoT) problem by introducing a maximum
correntropy criterion to the pseudolinear Kalman filter (PLKF). PLKF has been a popular choice for solving BoT problems
owing to the reduced computational complexity. However, the coupling between the measurement vector and pseudolinear
noise causes bias in PLKF. To address this issue, a bias-compensated PLKF (BC-PLKF) under the assumption of Gaussian
noisewas formulated. However, this assumptionmay not be valid in most practical cases. Therefore, a bias-compensated PLKF
with maximum correntropy criterion is introduced, resulting in two new filters: maximum correntropy pseudolinear Kalman
filter (MC-PLKF) and maximum correntropy bias-compensated pseudolinear Kalman filter (MC-BC-PLKF). To demonstrate
the performance of the proposed estimators, a comparative analysis assuming large outliers in the process and measurement
model of 2D BoT is conducted. These large outliers are modeled as non-Gaussian noises with diverse noise distributions that
combine Gaussian and Laplacian noises. The simulation results are validated using root mean square error (RMSE), average
RMSE (ARMSE), percentage of track loss and bias norm. Compared to PLKF and BC-PLKF, all the proposed maximum
correntropy-based filters (MC-PLKF and MC-BC-PLKF) performed with superior estimation accuracy. 相似文献
16.
An investigation was carried out to assess the prognostic significance of proliferation marker Ki67 in a group of lung cancer patients treated by surgery (limited disease). Tissue was not available for Ki67 immunostaining in inoperable group. The diagnosis is established by bronchial biopsy which does not carry enough tissue for frozen section and counting. This study is supplemented by estimating the prognostic significance of histological sub-types in the operable group and in a group of inoperable patients with extensive disease. These are usually treated by radiotherapy and/or chemotherapy. In all, 267 patients were studied including 105 treated by surgery. These patients attended King's College and Brompton Hospital, UK, between 1986 and 1989. With regard to proliferation marker Ki67 done for the surgical group, only patients with Ki67 scores of less than 5% did survive significantly longer than the rest. Histology did not make any significant contribution in determining prognosis in both operable and inoperable groups. Although follow-up is limited (mean 20 months), Ki67 antibody seems promising in identifying low and high grade disease in the initial stage of lung cancer. It may prove useful for category of patients with high scores to be placed on chemotherapy/radiotherapy. Results suggest that in the case of lung tumour, proliferative activity is a better prognostic indicator than histological type. 相似文献
17.
Peng Zhang Jiapeng Li Deyu Yang Razium Ali Soomro Bin Xu 《Advanced functional materials》2023,33(1):2209918
2D MXenes have emerged as promising supercapacitor electrode materials due to their metallic conductivity, pseudo-capacitive mechanism, and high density. However, layer-restacking is a bottleneck that restrains their ionic kinetics and active site exposure. Herein, a carbon dots-intercalated strategy is proposed to fabricate flexible MXene film electrodes with both large ion-accessible active surfaces and high density through gelation of calcium alginate (CA) within the MXene nanosheets followed by carbonization. The formation of CA hydrogel within the MXene nanosheets accompanied by evaporative drying endow the MXene/CA film with high density. In the carbonization process, the CA-derived carbon dots can intercalate into the MXene nanosheets, increasing the interlayer spacing and promoting the electrolytic diffusion inside the MXene film. Consequently, the carbon dots-intercalated MXene films exhibit high volumetric capacitance (1244.6 F cm−3 at 1 A g−1), superior rate capability (662.5 F cm−3 at 1000 A g−1), and excellent cycling stability (93.5% capacitance retention after 30 000 cycles) in 3 m H2SO4. Additionally, an all-solid-state symmetric supercapacitor based on the carbon dots-intercalated MXene film achieves a high volumetric energy density of 27.2 Wh L−1. This study provides a simple yet efficient strategy to construct high-volumetric performance MXene film electrodes for advanced supercapacitors. 相似文献
18.
Soomro Toufique A. Zheng Lihong Afifi Ahmed J. Ali Ahmed Yin Ming Gao Junbin 《Artificial Intelligence Review》2022,55(2):1409-1439
Artificial Intelligence Review - Since early 2020, the whole world has been facing the deadly and highly contagious disease named coronavirus disease (COVID-19) and the World Health Organization... 相似文献
19.
Muhammad Yousuf Soomro Ijaz Hussain Nargis Bano Esteban Broitman Omer Nur Magnus Willander 《Nanoscale research letters》2012,7(1):146
We measure the elastic modulus of a single horizontal ZnO nanorod [NR] grown by a low-temperature hydrothermal chemical process on silicon substrates by performing room-temperature, direct load-controlled nanoindentation measurements. The configuration of the experiment for the single ZnO NR was achieved using a focused ion beam/scanning electron microscope dual-beam instrument. The single ZnO NR was positioned horizontally over a hole on a silicon wafer using a nanomanipulator, and both ends were bonded with platinum, defining a three-point bending configuration. The elastic modulus of the ZnO NR, extracted from the unloading curve using the well-known Oliver-Pharr method, resulted in a value of approximately 800 GPa. Also, we discuss the NR creep mechanism observed under indentation. The mechanical behavior reported in this paper will be a useful reference for the design and applications of future nanodevices. 相似文献
20.
Soomro Shan-e-hyder Hu Caihong Boota Muhammad Waseem Ahmed Zubair Chengshuai Liu Zhenyue Han Xiang Li Soomro Mairaj Hyder Alias Aamir 《Water Resources Management》2022,36(7):2131-2160
Water Resources Management - The morphometric attributes of a drainage basin reveal the hydrological and morphological dynamics of the area. Current work emphasizes the hydro-geomorphic... 相似文献