Sulfonated porous organic polymer supported Ziegler-Natta catalysts for the synthesis of ultra-high molecular weight polyethylene.

Porous organic polymers (POPs) are attracting attention for their easy functionalization and potential as catalyst supports in olefin polymerization. In this study, sulfonated POP (s-POP) supported Ziegler-Natta catalysts were used for ethylene polymerization, producing ultra-high molecular weight polyethylene, with reaching up to 6.83 × 10 g mol.

Three-dimensional stability of a fill slope reinforced by a frame beam anchor plate.

The frame beam anchor plate is a new supporting structure reinforcing fill slopes. At present, only a few studies have evaluated its static stability based on the two-dimensional plane assumption. In this paper, the limit analysis method is combined with the three-dimensional spiral failure mechanism to evaluate the factor of safety (Fs) of a slope supported by a frame beam anchor plate.

Stable and Tunable Quantum Conductance in Spider-Silk-like Synaptic Device for Neurocomputing.

The quantum conductance (QC) behaviors in synaptic devices with stable and tunable conductance states are essential for high-density storage and brain-like neurocomputing (NC). In this work, inspired by the discontinuous transport of fluid in spider silk, a synaptic device composed of a silicon oxide nanowire network embedded with silicon quantum dots (Si-QDs@SiO) is designed. The tunable QC behaviors are achieved in both the SET and RESET processes, and the QC states exhibit stable retention time exceeding 10 s in the synaptic device and show stable reproducibility after an interval of two months.

Enhanced detection limit in an exceptional surface-based fiber resonator by manipulating Fano interference.

An exceptional surface (ES) has advantages in improving sensing robustness and enhancing frequency splitting. Typically, the eigenvalue splitting must exceed the mode linewidth in order to be clearly visible in the spectrum, which limits the precision of the ES-based sensing structure. In this paper, a strategy for manipulating spectral line shape in an ES-based structure is experimentally realized.

Influence of Crosslink Density on Electrical Performance and Rheological Properties of Crosslinked Polyethylene.

To investigate the influence of the crosslinked polyethylene (XLPE) structure on electrical performance, various analytical methods were employed to study polyethylene structures with different degrees of crosslinking. Dynamic rheological analysis was conducted to determine material shear viscosity, dynamic viscosity, storage modulus (G'), loss modulus (G″), and other rheological parameters. Additionally, the electrical performance of the material was analyzed by studying the phenomenon of space charge accumulation under direct current voltage.

Controllability of the Conductive Filament in Porous SiO Memristors by Humidity-Mediated Silver Ion Migration.

Oxide-based memristors composed of Ag/porous SiO/Si stacks are fabricated using different etching time durations between 0 and 90 s, and the memristive properties are analyzed in the relative humidity (RH) range of 30-60%. The combination of humidity and porous structure provides binding sites to control silver filament formation with a confined nanoscale channel. The memristive properties of devices show high on/off ratios up to 10 and a dispersion coefficient of 0.

Overall Survival of Non-Small Cell Lung Cancer With Spinal Metastasis: A Systematic Review and Meta-Analysis.

Objective: The long-term survival data of lung cancer patients with spinal metastases are crucial for informed treatment decision-making. However, most studies in this field involve small sample sizes. Moreover, survival benchmarking and an analysis of changes in survival over time are required, but data are unavailable.

Phosphorus biorecovery from wastewater contaminated with multiple nitrogen species by a bacterial consortium.

Recovering finite and non-substitutable phosphorus from liquid waste streams through bio-mediated techniques has attracted increasing interest, but current approaches are incredibly dependent on ammonium. Herein, a process to recover phosphorus from wastewater under multiple nitrogen species conditions was developed. This study compared the effects of nitrogen species on the recovery of phosphorus resources by a bacterial consortium.

Porous Organic Polymers-Supported Zeigler-Natta Catalysts for Preparing Highly Isotactic Polypropylene with Broad Molecular Weight Distribution.

Porous organic polymers (POPs) have attracted much attention in numerous areas, including catalysis, adsorption and separation. Herein, POP supported Ziegler-Natta catalysts were designed for preparation of isotactic polypropylene (iPP). The POPs-based Ziegler-Natta catalysts exhibited the characteristic of broad molecular weight distribution (MWD > 11) with or without adding an extra internal electron donor.

Ambipolar steep-slope nanotransistors with Janus MoSSe/graphene heterostructures.

The transfer characteristics and switching mechanism of the steep-slope transistor composed of the graphene/Janus MoSSe heterostructure are investigated by quantum transport calculation. The Schottky barrier height at the Gr/SMoSe interface and tunneling width between the channel and drain can be tuned by the gate voltage, so that the device exhibits ambipolar switching with two minima in the subthreshold swing slope. 34 and 29 mV decadesubthreshold swings can be achieved and the on/off ratios are over 10and 10for the different switching mechanisms.

Giant and tunable Goos-Hänchen shift with a high reflectance induced by PT-symmetry in atomic vapor.

The Goos-Hänchen (GH) shifts of light beams reflected from conventional passive optical systems could be enhanced using the Brewster angle effect or resonance effect, but the maximum GH shift is located at the reflectance minima, which is difficult for experimental detection. In this paper, we present an efficient and flexible scheme to realize complex parity-time (PT)-symmetric periodic optical potentials (complex crystals) in helium atomic vapor. The GH shifts of probe light reflected from the complex crystal are theoretically investigated and large GH shifts could be obtained inside the high-reflection band.

GaO@GaN Nanowire Arrays on Flexible Graphite Paper with Tunable Persistent Photoconductivity.

Flexible optoelectronic synaptic devices that functionally imitate the neural behavior with tunable optoelectronic characteristics are crucial to the development of advanced bioinspired neural networks. In this work, amorphous oxide-decorated GaN nanowire arrays (GaO@GaN NWAs) are prepared on flexible graphite paper. A GaO@GaN NWA-based flexible device has tunable persistent photoconductivity (PPC) and shows a conversible fast/slow decay process (SDP).

Antisiphon device: A review of existing mechanisms and clinical applications to prevent overdrainage in shunted hydrocephalic patients.

Overdrainage of cerebrospinal fluid is one of the most notorious complications after ventriculoperitoneal shunt implantation. Siphon effect plays a major role in the development of overdrainage. Various overdrainage-preventing devices have been invented to counteract the siphon effect.

Enhancing nitrate removal from wastewater by integrating heterotrophic and autotrophic denitrification coupled manganese oxidation process (IHAD-MnO): Internal carbon utilization performance.

Due to cause the deterioration of water quality and can produce toxic nitrite, the nitrate constituted of great threatens to human health and eco-systematic safety. Among most well-known biotechnology to remove nitrate, the integrated heterotrophic and autotrophic denitrification (IHAD) process is promising, especially for the organic-limited polluted water. In this work, the IHAD coupled manganese oxidation (IHAD-MnO) process was developed by using Pseudomonas sp.

Effect of Oleamine on Microwave-Assisted Synthesis of Cesium Lead Bromide Perovskite Nanocrystals.

Herein, we reported a simple microwave-assisted method for synthesizing uniform CsPbBr and CsPbBr perovskite nanocrystals (PeNCs). The phase structure, photoluminescence (PL) emission, and quantum yield (QY) of CsPbBr PeNCs can be tuned by changing the radiation time and power of the microwave. The optimized CsPbBr PeNCs showed a high PLQY of up to 87%.

Strain-enhanced power conversion efficiency of a BP/SnSe van der Waals heterostructure.

A promising BP/SnSe van der Waals (vdW) photovoltaic heterostructure was designed and investigated by first-principles calculations. The BP/SnSe vdW heterostructure showed inhibition of photogenerated carrier recombination as well as broad and high optical absorption intensity spanning the visible to deep ultraviolet regions reaching the order of 105 cm-1. The carrier mobility of the BP/SnSe vdW heterostructure exhibited anisotropic characteristics reaching approximately 103 cm2 V-1 s-1, with an intrinsic power conversion efficiency (PCE) of 11.

Fabrication of a Hierarchical Ni(OH) @Ni S /Ni Foam Electrode from a Prussian Blue Analogue-Based Composite with Enhanced Electrochemical Capacitive and Electrocatalytic Properties.

Developing high-efficiency, cost-effective, and durable electrodes is significant for electrochemical capacitors and electrocatalysis. Herein, a 3D bifunctional electrode consisting of nickel hydroxide nanosheets@nickel sulfide nanocubes arrays on Ni foam (Ni(OH) @Ni S /NF) obtained from a Prussian blue analogue-based precursor is reported. The 3D higher-order porous structure and synergistic effect of different compositions endow the electrode with large specific surface area, facile ion/electron transport path, and improved conductivity.

Systemic identification and analyses of genes potentially involved in chemosensory in the devastating tea pest Basilepta melanopus.

Basilepta melanopus is a serious insect pest of tea plantations in southern China. This tea pest poses a great threat to the tea industry in China. No effective and environmentally friendly methods have been established to control this pest at present.

Stability and Repeatability of a Karst-like Hierarchical Porous Silicon Oxide-Based Memristor.

A memristor architecture based on porous oxide materials has the potential to be used in artificial synaptic devices. Herein, we present a memristor system employing a karst-like hierarchically porous (KLHP) silicon oxide structure with good stability and repeatability. The KLHP structure prepared by an electrochemical process and thermal oxidation exhibits high ON-OFF ratios up to 10 during the endurance test, and the data can be maintained for 10 s at a small read voltage 0.

Lithium ion trapping mechanism of SiO in LiCoO based memristors.

Pt/LiCoO/SiO/Si stacks with different SiO thicknesses are fabricated and the influence of SiO on memristive behavior is investigated. It is demonstrated that SiO can serve as Li ion trapping layer benefiting device retention, and the thickness of SiO must be controlled to avoid large SET voltage and state instability. Simulation model based on Nernst potential and diffusion potential is postulated for electromotive force in LiCoO based memristors.

Tunable band offsets in the BP/PO van der Waals heterostructure: first-principles calculations.

The structural and electronic properties of the black phosphorus/phosphorus pentoxide (BP/P4O10) van der Waals (vdW) heterostructure are investigated theoretically by first-principles calculations. The BP/P4O10 vdW heterostructure is a direct bandgap semiconductor with intrinsic type-II band alignment thus facilitating separation of photoexcited charge carriers. A transition from semiconducting to metallic is predicted under a positive electric field and the transition of type-II to type-I band alignment occurs under a negative electric field in the BP/P4O10 vdW heterostructure.

Preparation of Ultrahigh Molecular Weight Polyethylene/Graphene Nanocomposite In situ Polymerization via Spherical and Sandwich Structure Graphene/Sio Support.

Reduced graphene oxide/SiO (RGO/SiO) serving as a novel spherical support for Ziegler-Natta (Z-N) catalyst is reported. The surface and interior of the support has a porous architecture formed by RGO/SiO sandwich structure. The sandwich structure is like a brick wall coated with a graphene layer of concreted as skeleton which could withstand external pressures and endow the structure with higher support stabilities.