Gas separation processes are amongst the most important operations in the refineries and gas-related industries. Recently, many efforts are being dedicated towards modifying the gas separation ...properties of existing polymers to further expand their use for extensive industrial gas separation applications. Mixed matrix membranes (MMMs), which are organic–inorganic hybrid membranes, have been proposed as the alternative approach to intensify the comprehensive gas separation performance of the polymeric membranes. In this regard, we analyze and review the recent scientific and technological advances in the development of MMM's, including the emerging class of inorganic fillers like two-dimensional (2D)materials, that have been the focus of much recent work for gas separation. The review also discusses the current issues associated with the filler materials and further provides an outline to overcome the emerging challenges for the future development of high performance MMMs.
•Reviewed recent advances of inorganic materials used to develop MMMs for gas separation.•Highlighted 2D materials as emerging membranes platform for gas separation.•Modification in the polymer matrix and polymer-filler interaction in MMM.•Effect of filler loading on gas permeation.
Nanocrystalline NiFe
2O
4 known to exhibit inverse spinel structure was used as a gas sensing element at room temperature. Ni ferrite nano-particles were prepared using chemical co-precipitation ...technique. Single phase formation of the cubic NiFe
2O
4 was confirmed by X-ray diffraction data. Fine powder resulted from the chemical co-precipitation reaction was used to prepare gas sensing elements in pellet and thick film forms. SEM technique was used to study the surface morphology of the sensing elements. The resistance measurements were carried out by exposing the sensing elements to various gases, namely O
2, LPG, ammonia and Cl
2 in a closed chamber at room temperature. It was found that the NiFe
2O
4 thick film sensor showed superior response than the pellet sensor. The sensing response was in the order Cl
2
>
ammonia
>
LPG
>
O
2. The maximum response of the NiFe
2O
4 thick film to Cl
2 and ammonia was 96% and 68%, respectively, at room temperature.
The biosynthesis of metal oxide nanoparticles (NPs) using plant extract is green, rapid, attractive and cost-effective approach. In the present study, we are reporting biosynthesis of ZrO
2
NPs as an ...efficient photocatalyst by using
Ficus benghalensis
(F.B.) leaf extract as a capping agent for the first time. To determine its optical, structural and morphological properties, the obtained ZrO
2
NPs were characterized by using UV–Vis, DRS, XRD, FT-IR, HR-TEM, FT-Raman and BET-surface area. XRD pattern confirms that biosynthesized ZrO
2
NPs are crystalline in nature with monoclinic and tetragonal structure. TEM images show that the obtained ZrO
2
NPs has spherical morphology with 15 nm in size which is good agreement with XRD results. A decrease in the band gap of bulk ZrO
2
from 5.3 to 4.9 eV is observed due to the quantum size effect. The as-synthesized ZrO
2
NPs have high specific surface area of 88 m
2
/g was obtained by BET analysis. The photocatalytic efficiency of ZrO
2
NPs is evaluated for the photodegradation of methylene blue and methyl orange dyes as the target pollutants under UV light irradiation. The different parameters like catalyst loading amount and pH have also been studied. It is observed that photodegradation of methylene blue and methyl orange up to 91 and 69% within 240 min by using ZrO
2
catalyst. Moreover, this green synthesis process provides a valuable alternative to orthodox multistep processes for the preparation of ZrO
2
NPs.
In the present report an efficient, rapid, facile and inexpensive route for the synthesis of benzimidazoles using 1,2-arylenediamines and N , N -dimethylformamide in acidic medium under ...thermal/microwave condition is developed. This reaction was further explored with the different amides to afford a library of 2-substituted benzimidazoles. The advantage of the present synthetic method includes shorter reaction time, easy work up and excellent yields without using catalysts.
Hematopoietic stem cell transplant (HCT) recipients have a substantial risk of developing secondary solid cancers, particularly beyond 5 years after HCT and without reaching a plateau overtime. A ...working group was established through the Center for International Blood and Marrow Transplant Research and the European Group for Blood and Marrow Transplantation with the goal to facilitate implementation of cancer screening appropriate to HCT recipients. The working group reviewed guidelines and methods for cancer screening applicable to the general population and reviewed the incidence and risk factors for secondary cancers after HCT. A consensus approach was used to establish recommendations for individual secondary cancers. The most common sites include oral cavity, skin, breast and thyroid. Risks of cancers are increased after HCT compared with the general population in skin, thyroid, oral cavity, esophagus, liver, nervous system, bone and connective tissues. Myeloablative TBI, young age at HCT, chronic GVHD and prolonged immunosuppressive treatment beyond 24 months were well-documented risk factors for many types of secondary cancers. All HCT recipients should be advised of the risks of secondary cancers annually and encouraged to undergo recommended screening based on their predisposition. Here we propose guidelines to help clinicians in providing screening and preventive care for secondary cancers among HCT recipients.
Purpose: To compare the slit-lamp method and wavefront aberrometry method based on outcomes of toric realignment surgeries. Settings: Tertiary care ophthalmic hospital. Design: Retrospective study. ...Methods: This study included all eyes undergoing toric intraocular lens (TIOL) realignment surgery between January 2019 and December 2021 for which TIOL axis assessment by slit-lamp method and wavefront aberrometry method was available. Data were retrieved from electronic medical records, and we documented demographics, uncorrected visual acuity (UCVA), subjective refraction, and TIOL axis by slit-lamp and wavefront aberrometry methods on postoperative day 1 and day 14. In patients with misalignment, TIOL was realigned to the original position in group 1 (27 patients) and to an axis based on calculations provided by wavefront aberrometer in group 2 (25 patients). Post-realignment surgery, UCVA, subjective refraction, and TIOL axis by slit-lamp and wavefront aberrometry methods were assessed and analyzed. Results: We analyzed 52 eyes and found that the mean preoperative misalignment with the slit-lamp method (44.9° ±20.0°) and wavefront aberrometry (47.1° ±19.5°) was similar. The corresponding degrees of misalignment post-TIOL repositioning surgeries were 5.2° ±5.2° (slit-lamp method) and 4.7° ±5.1° (wavefront aberrometry) (P = 0.615). Both groups showed significant improvement in median log of minimum angle of resolution (logMAR) UCVA and reduction in median refractive cylinder. Conclusions: Slit-lamp method is as good as wavefront aberrometer method to assess TIOL axis. Toric realignment surgery is found to be safe, and realigning TIOL based on either slit-lamp method or wavefront aberrometer method equally improved UCVA and decreased residual refractive cylinder.
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► Successful synthesis and characterization of nanocrystalline NixCo1–xFe2O4 ferrites. ► Ferrimagnetic to paramagnetic transition values of Ni–Co ferrite lie between 863 and 793K. ► ...Unusual electric and dielectric behavior well above room temperature is discussed.
Nanocrystalline samples of NixCo1–xFe2O4, where x=1, 0.8, 0.6, 0.4, 0.2 and 0, were synthesized by chemical co-precipitation method. The spinel cubic phase formation of Ni–Co ferrite samples was confirmed by X-ray diffraction (XRD) data analysis. All the Bragg lines observed in XRD pattern belong to cubic spinel structure of ferrite. Scanning Electron Microscopy (SEM) technique was used to study the surface morphology of the Ni–Co ferrite samples. Nanocrystalline size of Ni–Co ferrite series was observed in SEM images. Pellets of Ni–Co ferrite were used to study the electrical and dielectric properties. The resistivity measurements were carried out on the samples in the temperature range 300–900K. Ferrimagnetic to paramagnetic transition temperature (Tc) for all samples was noted from resistivity data. The activation energy below and above Tc was calculated. The dielectric constant (ɛ′) measurements with increasing temperature show two peaks in the temperature range of measurements for all samples under investigation. The peaks observed show frequency and compositional dependences as a function of temperature. Electrical and dielectric properties of nanocrystalline NixCo1–xFe2O4 samples show unusual behavior in temperature range of 500–750K. To our knowledge, nobody has discussed such anomalies for nanocrystalline NixCo1–xFe2O4 at high temperature. Here, we discuss the mechanism responsible for electrical and dielectric behavior of nanocrystalline NixCo1–xFe2O4 samples.
Cricket Score Prediction Using Machine Learning Kamble, R R; Koul, Nidhi; Adhav, Kaustubh ...
Turkish journal of computer and mathematics education,
04/2021, Letnik:
12, Številka:
1S
Journal Article
Odprti dostop
Currently, there is a system which can calculate the current run rate and from it calculates the final score of the team. It doesn’t consider the fact about the no of wickets and also where the game ...is being played. The problem with the current system is that it is unable to predict the score of the 2nd team and also unable to predict the win percentage This system which is developed will have 2 model in it the 1st model predict the score a team will get after playing 50 over from the current situation. The second method predicts the win percentage of both teams even before the match has started this done by player selection. We found that error in regression toward the mean classifier could be a smaller quantity than Naïve mathematician in predicting match outcome has been sixty-eight ab initio from 2-15 overs to ninety-one until the top of 42th over.
Simple and time efficient hydrothermal method was employed to obtain phase pure anatase TiO
2
and Co
2+
-TiO
2
nanoparticles (NPs) as an efficient visible light active photocatalyst. The phase ...purity, morphology, optical property, and compositions were confirmed by various characterization techniques. The XRD analysis confirms the polycrystalline nature for Co
2+
-TiO
2
photocatalyst. Raman peaks at 398, 516.89 and 640 cm
−1
affirmed anatase Co
2+
-TiO
2
NPs and XPS analysis reveals substitution of Ti
4+
with Co
2+
ions in TiO
2
NPs. The 1.61 wt.% Co
2+
-TiO
2
NPs has bandgap value of 2.95 eV which specifies the efficiency of material for the absorption of visible light. The obtained TiO
2
and Co
2+
-TiO
2
materials were explored for photocatalytic degradation of MG under UV, visible and direct sunlight. The removal of MG was confirmed using COD analysis. The obtained visible light active (1.61 wt.%) Co
2+
-TiO
2
showed 82% removal of MG under direct sunlight.
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