29 research outputs found
GENERATING TRAINING DATABASES USED IN VECTOR BASED OBJECT RECOGNITION IN HYBRID CLOUD USING PUBLIC PROFILES
Techniques are provided herein for generating a face data set which contains badge identifier photos and photos from social media. The faces are automatically tagged using facial recognition, text recognition, and human relationship mining
Continuous and complete conversion of high concentration p-nitrophenol in a flow-through membrane reactor
Here, we report on a green and effective method for the continuous and complete conversion of high concentrations of p-nitrophenol (PNP) using a flow-through membrane reactor and less NaBH4. The catalytic membrane was successfully fabricated by loading Pd nanoparticles onto the surface of a branched TiO2 nanorod-functionalized ceramic membrane. The modification with branched TiO2 nanorods can significantly improve the loading amount of Pd nanoparticles onto ceramic membranes, resulting in enhanced catalytic performance. With 6 mg of Pd, 93 L m−2 hr−1 of flux density and 8.04 cm2 of membrane surface area in the flow-through membrane reactor, PNP at a concentration of 4,000 ppm can be converted to high-value p-aminophenol using less NaBH4 (using a molar ratio of NaBH4:PNP of 9.6) within 24 s at 30°C. More importantly, the conversion can be continuously and stably performed for 240 min
Extremely Efficient and Recyclable Absorbents for Oily Pollutants Enabled by Ultrathin-Layered Functionalization
Oils and organic solvents that leak
into water bodies must be promptly
removed to avoid ecological disasters, for example, by selective absorption
using oleophilic absorbents. However, it remains a challenge for the
low-cost synthesis of efficient and recyclable absorbents for oily
pollutants. By surface functionalization to inexpensive polyurethane
(PU) foams, we synthesize oil absorbents exhibiting the highest absorption
capacity and the best recyclability among all polymeric absorbents.
The synthesis is enabled by atomic layer deposition of ∼5 nm-thick
Al<sub>2</sub>O<sub>3</sub> transition layer onto the skeleton surface
of PU foams, followed by coupling a single-molecule layer of silanes
to the Al<sub>2</sub>O<sub>3</sub> layer. The sub-10 nm functionalization
layer provides the PU foam an outstanding water-repelling and oil-absorbing
functionality without compromising its high porosity and elasticity.
The functionalized foam is able to quickly absorb oily pollutants
spread on water surfaces or precipitated in water with a capacity
more than 100 times its own weight. This ultrathin-layer-functionalization
method is also applicable to renewable porous biomaterials, providing
a sustainable solution for oil spills. Moreover, we propose devices
than can continuously operate to efficiently collect oil spills from
water surfaces based on the functionalized PU foam developed in this
work
Induction of Axillary Bud Swelling of <i>Hevea brasiliensis</i> to Regenerate Plants through Somatic Embryogenesis and Analysis of Genetic Stability
To overcome rubber tree (RT) tissue culture explant source limitations, the current study aimed to establish a new Hevea brasiliensis somatic embryogenesis (SE) system, laying the technical foundation for the establishment of an axillary-bud-based seedling regeneration system. In this study, in vitro plantlets of Hevea brasiliensis Chinese Academy of Tropical Agricultural Sciences 917 (CATAS 917) were used as the experimental materials. Firstly, the optimum conditions for axillary bud swelling were studied; then, the effects of phenology, the swelling time of axillary buds (ABs), and medium of embryogenic callus induction were studied. Plantlets were obtained through somatic embryogenesis. Flow cytometry, inter-simple sequence repeat (ISSR molecular marker) and chromosome karyotype analysis were used to study the genetic stability of regenerated plants along with budding seedlings (BSs) and secondary somatic embryo seedlings (SSESs) as the control. The results show that the rubber tree’s phenology period was mature, and the axillary bud induction rate was the highest in the 2 mg/L 6-benzyladenine (6-BA) medium (up to 85.83%). Later, 3-day-old swelling axillary buds were used as explants for callogenesis and somatic embryogenesis. The callus induction rate was optimum in MH (Medium in Hevea) + 1.5 mg/L 2,4-dichlorophenoxyacetic acid (2,4-D) + 1.5 mg/L 1-naphthalene acetic acid (NAA) + 1.5 mg/L Kinetin (KT) + 70 g/L sucrose (56.55%). The regenerated plants were obtained after the 175-day culture of explants through callus induction, embryogenic callus induction, somatic embryo development, and plant regeneration. Compared with the secondary somatic embryo seedling control, axillary bud regeneration plants (ABRPs) were normal diploid plants at the cellular and molecular level, with a variation rate of 7.74%
Hierarchical FAU Zeolites Boosting the Hydrocracking of Polyolefin Waste into Liquid Fuels
Conventional metal-zeolite catalysts
struggle with hydrocracking
polyolefin wastes due to a significant mismatch between the size of
large polymer molecules and the micropores of zeolites. This severely
constrains diffusion and site accessibility, resulting in low efficiency.
Here, we unveil a simple hydrothermal treatment of commercial Y zeolite
that creates hierarchical Y zeolite (Y–H), which possesses
substantial layers of mesoporous nanoflakes on its surface, constructing
a unique pore architecture. This pore network integrates large (ca.
13 nm) and medium (ca. 4 nm) mesopores with the original micropores
(<1 nm) critically without altering the zeolite’s topology,
crystallinity, or acidity. Compared with commercial Y and Pt/Al2O3, Y–H and Pt/Al2O3 exhibit a remarkable 4-fold increase in activity, which is attributed
to enhanced accessibility of acid sites, providing sufficient cascade
cracking space for macromolecular polyolefins to be efficiently converted
into small, branched alkanes. Notably, the catalyst achieves an impressive
96.8% PE conversion with 90.8% selectivity toward value-added gasoline
and diesel fuels (C5–20) within 4 h at 280 °C.
This work not only demonstrates the pivotal role of hierarchical pore
networks in polyolefin hydrocracking but also highlights their broader
applicability in plastic waste upcycling
Fabrication of anti-leakage Hyflon AD/Poly(4-methyl-1-pentene) hollow fiber composite membrane for an extra-corporeal membrane oxygenation (ECMO) system
Extra-corporeal membrane oxygenation (ECMO) systems can perform the roles of the human heart and lungs to realize extra-corporeal oxygenation of blood. This system mainly depends on the gas-blood exchange membrane, the quality of which impacts the oxygenation performance. Currently, the most widely used gas-blood exchange membrane is made of poly(4-methyl-1-pentene) (PMP) hollow fibers. However, plasma leakage often occurs during clinical applications, which decreases the oxygenation performance and the service life and may endanger the patient's life in serious cases. In this work, Hyflon AD/PMP hollow fiber composite membranes were prepared by coating Hyflon AD on the surfaces of PMP hollow fibers to form ultra-thin, dense layers. Compared the plasma leakage time of the composite membrane with that of the pristine PMP membrane, the Hyflon AD60 layer showed great improvement in anti-leakage performance. The Hyflon AD60/PMP hollow fiber composite membrane possessed lower platelet adhesion and protein adhesion than that of the PMP membrane, indicating better blood compatibility of the Hyflon AD60 membrane. Cytotoxicity experiments were conducted to further confirm the biosafety of Hyflon AD60 as a blood contact medical membrane material. Gas permeance and oxygenation performance of the Hyflon AD60/PMP hollow fiber composite membrane were tested to ensure gas exchange efficiency during the gas separation process. Therefore, the optimized Hyflon AD60/PMP hollow fiber composite membrane has potential for clinical use
A Side-Stream Catalysis/Membrane Filtration System for the Continuous Liquid-Phase Hydrogenation of Phenol over Pd@CN to Produce Cyclohexanone
A catalysis/membrane
filtration system combining a catalytic reaction
and a separation process can realize the in situ separation of ultrafine
catalysts from the reaction mixture and make the production continuous.
In this study, a side-stream catalysis/membrane filtration system
was developed for the first time for the continuous liquid-phase hydrogenation
of phenol over Pd@CN to produce cyclohexanone. The operating parameters
including the reaction and filtration conditions were optimized by
balancing their influences on the catalytic and separation properties.
It was found that the properties of the side-stream catalysis/membrane
filtration system depended strongly on the operating conditions. Continuous
phenol hydrogenation over Pd@CN was performed under the optimized
operating conditions. A stable operation of 30 h was achieved with
both a phenol conversion and a cyclohexanone selectivity of greater
than 85%, and the ceramic membrane showed excellent stability. This
study is a contribution to the development of green cyclohexanone
production processes