Enhanced Spin–Orbit Torques in Graphene by Pt Adatoms Decoration

Graphene(Gr)with widely acclaimed characteristics,such as exceptionally long spin diffusion length at room temperature,provides an outstanding platform for spintronics.However,its inherent weak spin–orbit coupling(SOC)has limited its efficiency for generating the spin currents in order to control the magnetization switching process for applications in spintronics memories.Following the theoretical prediction on the enhancement of SOC in Gr by heavy atoms adsorption,here we experimentally observe a sizeable spin–orbit torques(SOTs)in Gr by the decoration of its surface with Pt adatoms in Gr/Pt(t Pt)/Fe Ni trilayers with the optimal damping-like SOT efficiency around 0.55 by 0.6-nm-thick Pt layer adsorption.The value is nearly four times larger than that of the Pt/Fe Ni sample without Gr and nearly twice the value of the Gr/Fe Ni sample without Pt adsorption.The efficiency of the enhanced SOT in Gr by Pt adatoms is also demonstrated by the field-free SOT magnetization switching process with a relatively low critical current density around 5.4 MA/cm^(2)in Gr/Pt/Fe Ni trilayers with the in-plane magnetic anisotropy.These findings pave the way for Gr spintronics applications,offering solutions for future low power consumption memories.

MiR-19a-3p/PTEN axis regulates the anticancer effect of circHIAT1in breast cancer in vitro

Objective: Breast cancer is a major cancer threatening the health of women globally. To elucidate the effect ofthe circHIAT1/miR-19a-3p/phosphatase and tensin homolog (PTEN) axis on regulating the malignant phenotype ofbreast cancer cells. Methods: The mRNA expression pattern of circHIAT1, miR-19a-3p, and PTEN was checked byreal-time quantitative polymerase chain reaction. Then, the knockdown assay was carried out to explore the effect ofcircHIAT1 and miR-19a-3p on breast cancer. The relative cell experiments, including MTT assay, scratch assay,transwell invasion assay, and flow cytometry analysis, were conducted to verify the influence of circHIAT1 and miR-19a-3p on breast cancer cells. Results: The levels of PTEN and circHIAT1 were reduced, while that of miR-19a-3pwas elevated in breast cancer tissues and cells. MiR-19a-3p was proved to be the target gene of circHIAT1 via a dualluciferase experiment, which could also modulate the PTEN mRNA level. Overexpression of circHIAT1 was able toundermine the growth, migratory ability, and invasiveness in breast cancer cells, which could be antagonized by miR-19a-3p mimic. The inhibition of miR-19a-3p in vitro also impaired the malignancy of breast cancer, which dependedon the modulation of PTEN expression. Conclusion: CircHIAT1 controls the PTEN expression level in cells of breastcancer by negatively regulating miR-19a-3p. This mechanism controls the growth, invasion, and migration of breastcancer.

Self-propagating High-temperature Synthesis, Microstructure and Mechanical Properties of TiC-TiB_2-Cu Composites

TiC-TiB2-Cu composites were produced by self-propagating high-temperature synthesis combined with pseudo hot isostatic pressing using Ti, B4C and Cu powders. The microstructure and mechanical properties of the composites were investigated. The X-ray diffraction （XRD） and scanning electron microscopy （SEM） results showed that the final products were only TiC, TiB2 and Cu phases. The clubbed TiB2 grains and spheroidal or irregular TiC grains were found in the microstructure of synthesized products. The reaction temperature and grain size of TiB2 and TiC particles decreased with increasing Cu content. The introduction of Cu into the composites resulted in a drastic increase in the relative density and flexual strength, and the maximum values were obtained with the addition of 20 wt pct, while the fracture toughness was the best when Cu content was 40 wt pct.

Noise in nanopore sensors: Sources, models, reduction, and benchmarking

Label-free nanopore sensors have emerged as a new generation technology of DNA sequencing and have been widely used for single molecule analysis.Since the firstα-hemolysin biological nanopore,various types of nanopores made of different materials have been under extensive development.Noise represents a common challenge among all types of nanopore sensors.The nanopore noise can be decomposed into four components in the frequency domain(1/f noise,white noise,dielectric noise,and amplifier noise).In this work,we reviewed and summarized the physicalmodels,origins,and reduction methods for each of these noise components.For the first time,we quantitatively benchmarked the root mean square(RMS)noise levels for different types of nanopores,demonstrating a clear material-dependent RMS noise.We anticipate this review article will enhance the understanding of nanopore sensor noises and provide an informative tutorial for developing future nanopore sensors with a high signal-to-noise ratio.

Exponential Set-Point Stabilization of Underactuated Vehicles Moving in Three-Dimensional Space

This paper investigates the stabilization of underactuated vehicles moving in a three-dimensional vector space.The vehicle’s model is established on the matrix Lie group SE(3),which describes the configuration of rigid bodies globally and uniquely.We focus on the kinematic model of the underactuated vehicle,which features an underactuation form that has no sway and heave velocity.To compensate for the lack of these two velocities,we construct additional rotation matrices to generate a motion of rotation coupled with translation.Then,the state feedback is designed with the help of the logarithmic map,and we prove that the proposed control law can exponentially stabilize the underactuated vehicle to the identity group element with an almost global domain of attraction.Later,the presented control strategy is extended to set-point stabilization in the sense that the underactuated vehicle can be stabilized to an arbitrary desired configuration specified in advance.Finally,simulation examples are provided to verify the effectiveness of the stabilization controller.

新疆部分地区牛环形泰勒虫病的防治动态分析

环形泰勒虫病是一类蜱传性血液原虫病,在我国新疆地区的某些场该病发病率曾高达35%,死亡率高达46.4%,给作为中国最大畜牧业基地之一的新疆带来了不可估计的危害。本文对不同时间段新疆部分地区牛环形泰勒虫病的流行情况以及主要治疗药物进行了统计与分析,结果显示新疆部分地区牛环形泰勒虫病的发病率随着时间的推移而降低;贝尼尔在治疗该病方面应用最为广泛,治疗效果显著,因此得出贝尼尔是治疗我区牛环形泰勒虫病理想药物的结论。以期为新疆地区牛环形泰勒虫病的治疗提供更为可靠的依据。

Anti-stacking synthesis of MXene-reduced graphene oxide sponges for aqueous zinc-ion hybrid supercapacitor with improved performance

Two‑dimensional MXenes with an enormous active surface area are considered to be significant cathode materials for Zn‑ion hybrid supercapacitors. However, the nanosheets are easily self-restacked during the assembly into macroscopic porous electrodes, resulting in a significantly reduced effective surface area, hindering their applications in energy storage. Here, MXenes are subtly distributed on the surface of the sponge in a coral-like structure rather than participating in the assembly of the framework, which has suppressed the self-restacking of MXene effectively, improved the hydrophilicity of the sponge, and provided fast diffusion channels for electrolyte ions. Therefore, the MXene-TiC-reduced graphene oxide sponge exhibits excellent electrical conductivity, an enormous specific surface area with abundant accessible electroactive sites, and superior electrochemical performance. The resulting sponge demonstrates an outstanding specific capacity, up to 501 mAh g–1 at 0.2 A g–1 , with excellent capacity retention (90%) after 3100 cycles as Zinc-ion hybrid supercapacitor cathodes. Furthermore, it exhibits an elegant gravimetric energy density of 486 mWh g–1 at 415 mW g–1 , which has surpassed most leading MXene-based Zn-ion cathodes. This work provides a new synthetic idea for MXene-based macro-composites and paves a new avenue for designing next-generation flexible and portable porous electrodes with high gravimetric and rate performances.

Ultra-fast synthesis and thermodynamic analysis of MoAlB by self-propagating high-temperature combustion synthesis

MoAlB as a typical member of MAB phases has attracted much-growing attention due to its unique properties.However,the low production of MoAlB powders limits its further development and potential applications.In the present work,the ultra-fast preparation of high-purity MoAlB powders in a few seconds is achieved by self-propagating high-temperature synthesis(SHS)using a raw powder mixture at an atomic ratio of Mo:Al:B=1:1.3:1.SHS reaction mechanism is obtained by analyzing the corresponding composition changes of starting materials.Furthermore,the thermodynamic prediction for the SHS reaction is consistent with the present experiments,where the preparation of MoAlB also conforms to two common self-propagating conditions of the SHS.The enthalpy vs.temperature curve shows that the adiabatic temperature of the reaction decreases with the amount of excuse Al increasing but increases when pre-heating the reactants.Also,this thermodynamic calculation provides a new idea for the preparation of other MAB phases by the SHS.

A long adult intussusception secondary to transverse colon cancer

The occurrence of adult intussusception arising from colorectal cancer is quite rare. We present the case of a 76-year-old man with sudden abdominal pain and vomiting. Clinical symptoms included severe abdominal distension and tenderness. Computed tomography scan of the abdomen revealed left-sided colocolic intussusception with a lead point. The patient underwent a left hemicolectomy with right transverse colostomy. Pathologic evaluation revealed moderately differentiated adenocarcinoma invading the muscularis propria; the regional lymph nodes were negative for cancer cells. The postoperative course was uneventful.

A Novel Hierarchically Lightweight Porous Carbon Derived from Egg White for Strong Microwave Absorption

Egg custard is a common dish on the dining table and exhibits a uniform porous structure after freezedrying.The protein within egg custard is a rich source of carbon and nitrogen,and the custard’s unique microstructure and adjustable electrical properties make it a potential porous carbon precursor.Herein,nitrogen in situ doped porous carbons(NPCs)and potassium-carbonate-modified NPCs(PNPCs)are obtained through a simple gelation and carbonization process using egg white as the raw material.The unique morphologies of the porous carbon are inherited from the protein and include fibrous clusters,honeycomb holes,and a grooved skeleton.Their excellent impedance matching and effective internal loss make the obtained porous carbons good candidates for lightweight electromagnetic(EM)wave absorbers without the need to dope with metal elements.As a representative porous carbon,PNPC10-700 has multiple structures,including fibrous clusters,honeycomb holes,and a porous skeleton.Moreover,it achieves a maximum reflection loss value of-66.15 dB(with a thickness of 3.77 mm)and a broad effective absorption bandwidth of 5.82 GHz(from 12.18 to 18.00 GHz,with a thickness of 2.5mm),which surpasses the reported values in most of the literatu re.Thus,gelation combined with the further carbonization of egg white(protein)is a new method for designing the morphology and EM properties of porous carbon absorbers.

DFT-assisting discovery and characterization of a hexagonal MABphase V_(3)PB_(4)

A 314-type MAB phase V_(3)PB_(4)with hexagonal crystal structure is synthesized by self-propagating high temperature combustion synthesis(SHS),with the help of the full first-principles predictions for the phase stability and adiabatic combustion temperature of SHS.Using XRD and TEM,V_(3)PB_(4)crystallizes in the space group of P6m2,with the lattice parameters a?3.030Åand c=9.148Å,of much interest,well with the predicted one.Furthermore,the electronic structure,chemical bonding,and elastic properties of hex-V_(3)PB_(4)are predicted by first-principles.No bandgap around Fermi energy indicates its electronic conductor.And the strong covalent bonding is present between the B and V atoms with,significantly,much weaker V-P bond.With the help of the theoretical model of bond stiffness,the significantly high ratio of bond stiffness of weakest bonds to the strongest ones(0.873)of hex-V_(3)PB_(4)indicates its poor damage tolerance and fracture toughness.The high bond stiffness results in its high moduli in comparison with other MAB phases.As the number of inserted P atoms increases,the engineering elastic modulus decrease,without the price of an increase in density.

Theoretical screening,intrinsic brittleness and thermal properties of the S-containing MAX carbides and borides

To respond the recent experimental advances,the phase stability,mechanical properties,phonon as well as infrared-and Raman-active modes,thermal expansion and heat capacity were investigated by density functional theory for the S-containing MAX carbides and borides(M fromⅢB toⅧB),of importance,well consistent with the available experimental results.After examining the thermodynamic competition with all the competing phases and intrinsic stability by their lattice dynamics,18 MAX phases were screened out from 138 ones.Using the“bond stiffness”model as well as the associated criterion for damage tolerance and fracture toughness,the ratio of bond stiffness of weakest M-S to the strongest MX bonds(k_(min)/k_(max))over 1/2 indicates their intrinsic brittleness of all S-containing MAX phases except Nb4SC3.Including the contributions from phonon and electrons,their linear thermal expansion coefficients[(8.1e13.6)×10^(-6)K^(-1),300-1,300 K]and heat capacities(Cp)as a function of temperature are predicted.Of much interest,a well-established relationship between molar C_(p)of the MAX and MX phases is theoretically deduced in the present work.

Laparoscopic radical distal pancreatectomy with portal venous tumor thrombectomy for the treatment of pancreatic acinar cell carcinoma after neoadjuvant chemotherapy

We have read the article“Current status and future prospect of surgical treatment for pancreatic cancer”,published in HepatoBiliary Surgery and Nutrition in 2020(1).This article mentions that in the past two decades,there has been significant development and progress in the surgical treatment of pancreatic cancer,significantly improving the tumor resection rate and reducing perioperative mortality and the incidence of severe complications.

Density-functional-theory predictions of mechanical behaviour and thermal properties as well as experimental hardness of the Ga-bilayer Mo_(2)Ga_(2)C

Mo_(2)Ga_(2)C is a new MAX phase with a stacking Ga-bilayer as well as possible unusual properties.To understand this unique MAX phase structure and promote possible future applications,the structure,chemical bonding,and mechanical and thermodynamic properties of Mo_(2)Ga_(2)C were investigated by first-principles.Using the“bond stiffness”model,the strongest covalent bonding(1162 GPa)was formed between Mo and C atoms in Mo_(2)Ga_(2)C,while the weakest Ga–Ga(389 GPa)bonding was formed between two Ga-atomic layers,different from other typical MAX phases.The ratio of the bond stiffness of the weakest bond to the strongest bond(0.33)was lower than 1/2,indicating the high damage tolerance and fracture toughness of Mo_(2)Ga_(2)C,which was confirmed by indentation without any cracks.The high-temperature heat capacity and thermal expansion of Mo_(2)Ga_(2)C were calculated in the framework of quasi-harmonic approximation from 0 to 1300 K.Because of the metal-like electronic structure,the electronic excitation contribution became more significant with increasing temperature above 300 K.

Numerical simulation of the influence of aerosol radiation effect on urban boundary layer

With the intensification of pollution and urbanization, the aerosol radiation effect continues to play an important role in the urban boundary layer. In this paper, a winter pollution process in Beijing has been taken as an example, and a new aerosol vertical profile in the radiative parameterization scheme within the Weather Forecast Research and Forecasting(WRF) model has been updated to study the effect of aerosols on radiation and the boundary layer. Furthermore, the interactions among aerosols,urbanization, and planetary boundary layer(PBL) meteorology were discussed through a series of numerical experiments. The results show the following:(1) The optimization improves the performance of the model in simulating the distribution features of air temperature, humidity, and wind in Beijing.(2) The aerosols reduce the surface temperature by reducing solar radiation and increasing the temperature in the upper layer by absorbing or backscattering solar radiation. The changes in the PBL temperature lead to more stable atmospheric stratification, reducing the energy transfer from the surface and the height of the boundary layer.(3) With the increase in the aerosol optical depth, the atmospheric stratification most likely becomes stable over rural areas, most likely becomes stable over suburb areas, and has great difficultly becoming stable over urban areas. Aerosol radiative forcing,underlying urban surfaces, and the interaction between them are the main factors that affect the changes in the meteorological elements in the PBL.

Vertically-aligned nanostructures for electrochemical energy storage

Energy storage devices with high energy and power densities are highly attractive for various applications ranging from portable electronics to electric vehicles and grid-level energy storage,such as rechargeable batteries and supercapacitors.One limiting factor in power density is.the ion transport in electrolyte,particularly in tortuous electrode materials with low porosity.A viable approach to enhance ion transport in electrolyte is to create vertically aligned structures and thus reduce electrode tortuosity.In the past decades,various methods have been explored to develop vertically aligned structures.This review summarizes battery kinetics to illustrate the importance of low tortuosity in electrodes,and then introduces various methods to create vertically aligned nanostructures,such as direct growth,templating and microfabrications.The electrochemical performance of electrodes or electrolytes created by each method is presented.At the end,this paper discusses challenges with these structures and the directions these technologies can be taken in the future.

Hotspots and difficulties of biliary surgery in older patients

With the accelerated aging society in China,the incidence of biliary surgical diseases in the elderly has increased significantly.The clinical characteristics of these patients indicate that improving treatment outcomes and realizing healthy aging are worthy of attention.How to effectively improve the treatment effect of geriatric biliary surgical diseases has attracted widespread attention.This paper reviews and comments on the hotspots and difficulties of biliary surgery in older patients from six aspects:(1)higher morbidity associated with an aging society,(2)prevention and control of pre-operative risks,(3)extending the indications of laparoscopic surgery,(4)urgent standardization of minimally invasive surgery,(5)precise technological progress in hepatobiliary surgery,and(6)guarantee of peri-operative safety.It is of great significance to fully understand the focus of controversy,actively make use of its favorable factors,and effectively avoid its unfavorable factors,for further improving the therapeutic effects of geriatric biliary surgical diseases,and thus benefits the vast older patients with biliary surgical diseases.Accordingly,a historical record with the highest age of 93 years for laparoscopic transcystic common bile duct exploration has been created by us recently.

Recent advances in engineered polymeric materials for efficient photodynamic inactivation of bacterial pathogens

Nowadays,infectious diseases persist as a global crisis by causing significant destruction to public health and the economic stability of countries worldwide.Especially bacterial infections remain a most severe concern due to the prevalence and emergence of multi-drug resistance(MDR)and limitations with existing therapeutic options.Antibacterial photodynamic therapy(APDT)is a potential therapeutic modality that involves the systematic administration of photosensitizers(PSs),light,and molecular oxygen(O_(2))for coping with bacterial infections.Although the existing porphyrin and non-porphyrin PSs were effective in APDT,the poor solubility,limited efficacy against Gram-negative bacteria,and non-specific distribution hinder their clinical applications.Accordingly,to promote the efficiency of conventional PSs,various polymer-driven modification and function-alization strategies have been adopted to engineer multifunctional hybrid phototherapeutics.This review as-sesses recent advancements and state-of-the-art research in polymer-PSs hybrid materials developed for APDT applications.Further,the key research findings of the following aspects are considered in-depth with constructive discussions:i)PSs-integrated/functionalized polymeric composites through various molecular in-teractions;ii)PSs-deposited coatings on different substrates and devices to eliminate healthcare-associated in-fections;and iii)PSs-embedded films,scaffolds,and hydrogels for regenerative medicine applications.

Dried bonito flakes-inspired moisture-responsive actuator with a gradient structure for smart devices

Exploring high-performance soft actuators from biomass resources is significant for developing eco-friendly smart devices.Dried bonito(DB)flake is a common food as well as a biomass material,and it can produce irregular motion in changed moisture,just like dancing.Inspired by this intriguing phenomenon,a cost-effective,biocom patible,and biodegradable moisture-responsive DB film actuator with a gradient structure is developed.The DB film actuator exhibits rapid and reversible bending deformation triggered by a humidity gradient with a high bending speed(40°s-1)and a maximum bending angle(180°).More-over,the DB film actuator shows large bending deformation(-71°to+51°)with a high actuation force(214.7 Pa)in response to changes in relative humidity.Furthermore,the actuation performance can be also tuned by adjusting the thickness of the film.Potential applications of this actuator,including smart grippers,crawling robots,and biomimetic flowers for visible humidity sensing,are demonstrated.More importantly,smart sweat-responsive wearables that automatically deform to promote sweat evaporation and convection during exercise are constructed based on the actuator,making it promising for adaptive personal thermal management.This work offers an easily processable,cost-effective,and environmentally benign strategy to construct moisture-responsive actuators for future eco-friendly smart devices.