One-step quantum dialogue

Quantum dialogue(QD)enables two communication parties to directly exchange secret messages simultaneously.In conventional QD protocols,photons need to transmit in the quantum channel for two rounds.In this paper,we propose a one-step QD protocol based on the hyperentanglement.With the help of the non-local hyperentanglement-assisted Bell state measurement(BSM),the photons only need to transmit in the quantum channel once.We prove that our one-step QD protocol is secure in theory and numerically simulate its secret message capacity under practical experimental condition.Compared with previous QD protocols,the one-step QD protocol can effectively simplify the experiment operations and reduce the message loss caused by the photon transmission loss.Meanwhile,the non-local hyperentanglement-assisted BSM has a success probability of 100%and is feasible with linear optical elements.Moreover,combined with the hyperentanglement heralded amplification and purification,our protocol is possible to realize long-distance one-step QD.

Study of the reaction mechanism for preparing powdered activated coke with SO_(2)adsorption capability via one-step rapid activation method under flue gas atmosphere

In this study,the impact of different reaction times on the preparation of powdered activated carbon(PAC)using a one-step rapid activation method under flue gas atmosphere is investigated,and the underlying reaction mechanism is summarized.Results indicate that the reaction process of this method can be divided into three stages:stage I is the rapid release of volatiles and the rapid consumption of O_(2),primarily occurring within a reaction time range of 0-0.5 s;stage II is mainly the continuous release and diffusion of volatiles,which is the carbonization and activation coupling reaction stage,and the carbonization process is the main in this stage.This stage mainly occurs at the reaction time range of 0.5 -2.0 s when SL-coal is used as material,and that is 0.5-3.0 s when JJ-coal is used as material;stage III is mainly the activation stage,during which activated components diffuse to both the surface and interior of particles.This stage mainly involves the reaction stage of CO_(2)and H2O(g)activation,and it mainly occurs at the reaction time range of 2.0-4.0 s when SL-coal is used as material,and that is 3.0-4.0 s when JJ-coal is used as material.Besides,the main function of the first two stages is to provide more diffusion channels and contact surfaces/activation sites for the diffusion and activation of the activated components in the third stage.Mastering the reaction mechanism would serve as a crucial reference and foundation for designing the structure,size of the reactor,and optimal positioning of the activator nozzle in PAC preparation.

One-step green method to prepare progressive burning gun propellant through gradient denitration strategy

Gradiently denitrated gun propellant(GDGP)prepared by a“gradient denitration”strategy is obviously superior in progressive burning performance to the traditional deterred gun propellant.Currently,the preparation of GDGP employed a tedious two-step method involving organic solvents,which hinders the large-scale preparation of GDGP.In this paper,GDGP was successfully prepared via a novelty and environmentally friendly one-step method.The obtained samples were characterized by FT-IR,Raman,SEM and XPS.The results showed that the content of nitrate groups gradiently increased from the surface to the core in the surface layer of GDGP and the surface layer of GDGP exhibited a higher compaction than that of raw gun propellant,with a well-preserved nitrocellulose structure.The denitration process enabled the propellant surface with regressive energy density and good progressive burning performance,as confirmed by oxygen bomb and closed bomb test.At the same time,the effects of different solvents on the component loss of propellant were compared.The result showed that water caused the least component loss.Finally,the stability of GDGP was confirmed by methyl-violet test.This work not only provided environmentally friendly,simple and economic preparation of GDGP,but also confirmed the stability of GDGP prepared by this method.

Developing super-hydrophobic and corrosion-resistant coating on magnesium-lithium alloy via one-step hydrothermal processing

Formation of super-hydrophobic and corrosion-resistant coatings can provide significant corrosion protection to magnesium alloys.However,it remains a grand challenge to produce such coatings for magnesium-lithium alloys due to their high chemical reactivity.Herein,a one-step hydrothermal processing was developed using a stearic-acid-based precursor medium,which enables the hydrothermal conversion and the formation of low surface energy materials concurrently to produce the super-hydrophobic and corrosion-resistant coating.The multiscale microstructures with nanoscale stacks and microscale spheres on the surface,as well as the through-thickness stearates,lead to the super-hydrophobicity and excellent corrosion resistance of the obtained coating.

One-step ethylene separation from ternary C_(2) hydrocarbon mixture with a robust zirconium metal-organic framework

One-step separation of high-purity ethylene(C_(2)H_(4))from C_(2) hydrocarbon mixture is critical but challenging because of the very similar molecular sizes and physical properties of C_(2)H_(4),ethane(C_(2)H_(6)),and acetylene(C_(2)H_(2)).Herein,we report a robust zirconium metal-organic framework(MOF)Zr-TCA(H3TCA=4,4',4"-tricarboxytriphenylamine)with suitable pore size(0.6 nm×0.7 nm)and pore environment for direct C_(2)H_(4) purification from C_(2)H_(4)/C_(2)H_(2)/C_(2)H_(6) gas-mixture.Computational studies indicate that the abundant oxygen atoms and non-polar phenyl rings created favorable pore environments for the preferential binding of C_(2)H_(2) and C_(2)H_(6) over C_(2)H_(4).As a result,Zr-TCA exhibits not only high C_(2)H_(6)(2.28 mmol·g^(-1))and C_(2)H_(2)(2.78 mmol·g^(-1))adsorption capacity but also excellent C_(2)H_(6)/C_(2)H_(4)(2.72)and C_(2)H_(2)/C_(2)H_(4)(5.64)selectivity,surpassing most of one-step C_(2)H_(4) purification MOF materials.Dynamic breakthrough experiments confirm that Zr-TCA can produce high-purity C_(2)H_(4)(>99.9%)from a ternary gas mixture(1/9/90 C_(2)H_(2)/C_(2)H_(6)/C_(2)H_(4))in a single step with a high C_(2)H_(4) productivity of 5.61 L·kg^(-1).

One-step Eco-friendly Fabrication of Antibacterial Polyester Via On-line Amination Reaction by Melt Coextrusion

The work is dedicated to develop a one-step eco-friendly method to prepare antibacterial polyethylene terephthalate(PET).We report a one-step eco-friendly method to manufacture antibacterial PET via on-line amination reaction by melt coextrusion.Beside evenly mixing of poly(hexamethylene guanidine)(PHMG)and PET in the melt coextrusion procedure,the amination reaction also occurred between PHMG and PET under high temperature(230-270℃).The antibacterial ability of composite PET showed obvious PHMG concentration dependence,and antibacterial activity reached more than 99%when PHMG content was 2.5 wt%.Moreover,LIVE/DEAD fluorescence test further confirmed that the composite PET could kill bacteria quickly and efiectively(within 30 min);while negligible cytotoxicity was observed to HSF and HUVEC cells.Onestep eco-friendly fabrication of composite antibacterial PET was accomplished by on-line melt coextrusion.The composite antibacterial PET has potential use in multiple fields to combat with pathogenic including textiles,packaging materials,decoration materials and biomedical devices,etc.

Non-exposed endoscopic wall-inversion surgery with one-step nucleic acid amplification for early gastrointestinal tumors:Personal experience and literature review

BACKGROUND Laparoscopic and endoscopic cooperative surgery is a safe,organ-sparing surgery that achieves full-thickness resection with adequate margins.Recent studies have demonstrated the safety and efficacy of these procedures.However,these techniques are limited by the exposure of the tumor and mucosa to the peritoneal cavity,which could lead to viable cancer cell seeding and the spillage of gastric juice or enteric liquids into the peritoneal cavity.Non-exposed endoscopic wallinversion surgery(NEWS)is highly accurate in determining the resection margins to prevent intraperitoneal contamination because the tumor is inverted into the visceral lumen instead of the peritoneal cavity.Accurate intraoperative assessment of the nodal status could allow stratification of the extent of resection.One-step nucleic acid amplification(OSNA)can provide a rapid method of evaluating nodal tissue,whilst nearinfrared laparoscopy together with indocyanine green can identify relevant nodal tissue intraoperatively.AIM To determine the safety and feasibility of NEWS in early gastric and colon cancers and of adding rapid intraoperative lymph node(LN)assessment with OSNA.METHODS The patient-based experiential portion of our investigations was conducted at the General and Oncological Surgery Unit of the St.Giuseppe Moscati Hospital(Avellino,Italy).Patients with early-stage gastric or colon cancer(diagnosed via endoscopy,endoscopic ultrasound,and computed tomography)were included.All lesions were treated by NEWS procedure with intraoperative OSNA assay between January 2022 and October 2022.LNs were examined intraoperatively with OSNA and postoperatively with conventional histology.We analyzed patient demographics,lesion features,histopathological diagnoses,R0 resection(negative margins)status,adverse events,and follow-up results.Data were collected prospectively and analyzed retrospectively.RESULTS A total of 10 patients(5 males and 5 females)with an average age of 70.4±4.5 years(range:62-78 years)were enrolled in this study.Five patients were diagnosed with gastric cancer.The remaining 5 patients were diagnosed with early-stage colon cancer.The mean tumor diameter was 23.8±11.6 mm(range:15-36 mm).The NEWS procedure was successful in all cases.The mean procedure time was 111.5±10.7 min(range:80-145 min).The OSNA assay revealed no LN metastases in any patients.Histologically complete resection(R0)was achieved in 9 patients(90.0%).There was no recurrence during the follow-up period.CONCLUSION NEWS combined with sentinel LN biopsy and OSNA assay is an effective and safe technique for the removal of selected early gastric and colon cancers in which it is not possible to adopt conventional endoscopic resection techniques.This procedure allows clinicians to acquire additional information on the LN status intraoperatively.

基于Anti-Windup控制器的永磁同步电机控制系统设计

永磁同步电机矢量控制系统中存在非线性饱和特性。分析了经典的PID控制器用于系统时所带来的积分Windup现象,并介绍了几种典型而适用的Anti-Windup控制器结构,基于变结构Anti-Windup控制器对系统进行了改进以抑制积分Windup现象,控制器采用条件积分法和反计算法相结合的控制策略,保证了系统出现饱和时,尽快地退出饱和区。仿真和实验结果表明,该控制器能有效抑制系统的积分Windup现象,系统超调量小、速度响应快,具有较好的鲁棒性和较高的稳态性能。

基于积分状态预测的Anti-Windup PID控制器设计

目前有多种方式用来抑制调速系统中调节器饱和引起的Windup现象。其中跟踪反计算控制策略,由于其采用线性反馈作用原理来减小调节器饱和时的积分累加值,因此对于这种策略的研究和应用较多。但由于在设计调节器参数时,没有考虑速度指令和负载的变化,固定的反计算参数一般难以在大范围内保证系统响应的一致性。为了在不同速度指令和负载转矩条件下,保证系统响应的一致性,本文提出了积分状态预测Anti-Windup策略来减小系统由于饱和现象而引起的性能下降,根据速度指令和负载转矩的变化,在调节器饱和时计算出积分器在系统稳态积分终值,并将其作为调节器进入线性段的积分初始值,当系统参数精确时使得系统呈现出最优的速度响应曲线。本文在相同的电流环和速度环调节器PI参数的条件下,进行了仿真实验,比较了上述AW策略与传统方法的速度响应性能。实验结果验证了理论分析及仿真波形的正确性。

基于滤波器的Anti-Windup设计及其在伺服系统中的应用

针对控制器Windup问题 ,提出了一种基于滤波器的Anti-Windup设计方法 .该方法采用两步设计技术 ,通过合理地选取滤波器F(s) ,使系统满足相应的最优设计指标 ,提高了系统的性能 ,有效地解决了某型电动转台伺服系统中存在的控制器Windup问题 .转台伺服系统实际运行结果验证方法的有效性 ,并说明该方法也适用于类似的一般控制系统的Anti-Windup设计 .

永磁同步电机Anti-Windup速度控制器设计

主要针对永磁同步电机(PMSM)磁场定向控制系统中存在非线性饱和问题,分析了PI电机速度控制器Windup现象产生的过程及危害。对传统的Anti-reset Windup PI控制器进行了改进,将比例环节和积分环节对饱和影响进行了分离,从而使反馈补偿更为准确,有效提升了电机控制系统性能。通过仿真验证了可行性,并将其应用于所开发PMSM驱动控制系统中,在工程应用中取得了很好的控制效果,进一步验证了控制策略的可行性。

永磁同步电动机分数阶Anti-Windup控制器的研究

针对采用分数阶PI~λ控制器设计控制系统时引起的积分饱和现象(Windup现象),设计一种分数阶抗积分饱和控制器。根据分数阶积分特性,结合一种Anti-Windup控制器结构对控制器进行设计分析,并采用粒子群算法对控制器参数进行整定。最后将分数阶Anti-Windup控制器应用到永磁同步电动机(PMSM)调速系统中,通过仿真分析比较其控制性能。结果表明,分数阶Anti-Windup控制器能够降低系统超调量,提高系统快速性及抗干扰能力,具有良好的鲁棒性,可进一步改善控制系统的控制性能。

基于FPGA的永磁同步电机速度控制

针对永磁同步电机(PMSM)速度控制器中采用传统PI控制存在响应速度慢、超调量大以及容易出现积分饱和等问题,设计了采取Anti-Windup策略的速度控制器,并在现场可编辑逻辑门阵列(FPGA)中实现对PMSM的控制。首先采用高层次综合技术(HLS)对PMSM伺服控制关键模块完成建模,其次封装成IP核导入到工程中,最后下载到FPGA芯片上完成对PMSM的控制。经过与传统PI控制器实验比较,使用该速度控制方法超调量减小到4.3%,在负载处转速下降了14r/min,调节时间为0.01s,具有良好的动态性能和抗干扰性能,满足永磁同步电机伺服控制系统的应用需求。

基于Anti-Windup回馈推力矢量飞行控制系统研究

针对带推力矢量飞机大迎角机动飞行控制问题,文中主要研究推力矢量与气动舵面融合控制策略问题。结合串级链式推力矢量控制分配和Anti-Windup抗饱和控制结构,提出了一种基于Anti-Windui回馈推力矢量飞行控制系统设计结构,该控制策略合理分配操纵面的偏转指令,实现推力矢量和气动舵面的协调偏转。仿真结果表明,采用Anti-Windup抗饱和控制结构的推力矢量/气动舵面控制融合结构,对完成飞机在纵向平面内的过失速机动动作,有更好的控制效果。

电动转台Anti-Windup设计

任何实际的控制系统都包含有饱和非线性特性。由于他和特性的存在，导致控制器产生Windup问题，进而影响系统在较大信号输入时的性能指标，乃至于整个控制系统的稳定性。针对某型号电动转台控制系统中存在的Windup问题，利用基于内模控制（InternalModelControl）结构的Anti－Windup设计方法对转台系统进行了设计、仿真和实现。转台实际运行结果说明了该方法可以有效地提高电动转台大信号输入时的动态响应性能。

基于Anti-windup的光学中心偏差测量仪伺服系统的PID控制研究

针对光学中心偏差测量仪伺服控制系统运动中存在的非线性饱和问题,提出一种基于Anti-windup的PID控制算法,有效地解决了光学中心偏差测量仪直线导轨运动伺服系统中存在的控制器Windup问题。仿真结果表明:直线导轨伺服系统的性能得到明显改善,验证了该控制算法的可行性。

基于Anti-windup PID的四旋翼飞行器姿态控制研究

针对四旋翼飞行器姿态控制问题,设计一种Anti-windup PID姿态控制器。结合四旋翼飞行器简化的数学模型,在飞行器在垂直速率、俯仰速率、翻滚速率、偏航速率4个独立通道上分别设计了PID控制器和Anti-windup PID控制器。在MATLAB/SIMULINK环境下,对控制四旋翼飞行器姿态的两种算法进行仿真分析。仿真结果表明,Anti-windup PID控制方法在性能上明显优于PID,对飞行器有良好的控制效果。用Anti-windup PID算法搭建的四旋翼飞行器的物理实验平台更好地验证了该算法的有效性。

基于气动装置神经网络模型的anti-windup控制器设计

为提高气动系统的控制效果,以Levenberg-Marquardt算法训练多层前馈神经网络,建立了一气动装置的神经网络模型并推导出ARX模型.基于气动装置的ARX模型,采用Ragazzini方法设计了anti-windup控制器.实时控制结果表明,所设计的控制器有效地克服了控制死区和阀的饱和效应,实现了对该气动装置快速和高精度的控制.

基于GA的磁悬浮球系统的Anti-windup变结构PI控制

磁悬浮球系统是一个开环不稳定的强非线性系统,而且其控制输入-驱动电流必须在限定范围内变化.为了使输出的位移达到期望的位置,采用Anti-windup变结构PI控制器,结合遗传算法优化P、I、α的值,来使小球达到最理想的位置输出.实验结果表明,与常规PI控制器比较,Anti-windup变结构PI控制可以更快速稳定跟踪期望位置,振荡幅度明显减少.

Noether＇s theorem and one-step corrections method for holonomic system

In this paper, a new computational method for improving the accuracy of numerically computed solutions is introduced. The computational method is based on the one-step method and conserved quantities of holonomic systems are considered as kinematical constraints in this method.