Application of a Cleaning System Made up of a Centrifugal Fan with Double Channel and One Sieve to Combine

In this paper the application of a cleaning system which was made up of a centrifugal fan with double channel and one sieve to 4LZ-3.5 combine was introduced. This cleaning system with double channel compared with the traditional air-sieve cleaning system of combines may omit one two sieves and simplify the transmission mechanism. It is also compared with the present cleaning system with double channel applied to some combines, such as the Commandor 112CS/ 228CS combines of Claas Corporation in Germany and the MAXIMIZERTMombincs of John Deerc company in U.S.A. It may omit one sieve and the preclcaner and simlify the transmission mechanism. The measuring results indicated that the cleaning ratio of wheat grain is 99.1% and the cleaning loss ratio of wheat is 0.17% when the feed rate is 4.01 kg/ s.

IGZO/ZTO TFTs with Modulated Double Channel of Thickness Structures

The device characteristics of IGZO/ZTO(indium-gallium-zinc oxide/zinc-tin oxide)TFTs(thin film transistors)with modulated channels were investigated.The field effect mobility was enhanced to 20.4 cm2/Vs in the channel-modulated TFT.The electrical performance of the TFT device was improved by the insertion of a high carrier concentration layer at the channel/gate insulator interfaces.It was due to the enhancement of carrier accumulation and the reduction of parasitic resistance via channel modulation.The threshold voltage was controlled at appropriate value.These results indicate that the device characteristic of TFTs can be enhanced by the modulated channel structure.

Influence of variable viscosity and double diffusion on the convective stability of a nanofluid flow in an inclined porous channel

The influence of variable viscosity and double diffusion on the convective stability of a nanofluid flow in an inclined porous channel is investigated.The DarcyBrinkman model is used to characterize the fluid flow dynamics in porous materials.The analytical solutions are obtained for the unidirectional and completely developed flow.Based on a normal mode analysis,the generalized eigenvalue problem under a perturbed state is solved.The eigenvalue problem is then solved by the spectral method.Finally,the critical Rayleigh number with the corresponding wavenumber is evaluated at the assigned values of the other flow-governing parameters.The results show that increasing the Darcy number,the Lewis number,the Dufour parameter,or the Soret parameter increases the stability of the system,whereas increasing the inclination angle of the channel destabilizes the flow.Besides,the flow is the most unstable when the channel is vertically oriented.

Mechanism of Thermally Radiative Prandtl Nanofluids and Double-Diffusive Convection in Tapered Channel on Peristaltic Flow with Viscous Dissipation and Induced Magnetic Field

The application of mathematical modeling to biological fluids is of utmost importance, as it has diverse applicationsin medicine. The peristaltic mechanism plays a crucial role in understanding numerous biological flows. In thispaper, we present a theoretical investigation of the double diffusion convection in the peristaltic transport of aPrandtl nanofluid through an asymmetric tapered channel under the combined action of thermal radiation andan induced magnetic field. The equations for the current flow scenario are developed, incorporating relevantassumptions, and considering the effect of viscous dissipation. The impact of thermal radiation and doublediffusion on public health is of particular interest. For instance, infrared radiation techniques have been used totreat various skin-related diseases and can also be employed as a measure of thermotherapy for some bones toenhance blood circulation, with radiation increasing blood flow by approximately 80%. To solve the governingequations, we employ a numerical method with the aid of symbolic software such as Mathematica and MATLAB.The velocity, magnetic force function, pressure rise, temperature, solute (species) concentration, and nanoparticlevolume fraction profiles are analytically derived and graphically displayed. The results outcomes are compared withthe findings of limiting situations for verification.

Influences of double diffusion upon radiative flow of thin film Maxwell fluid through a stretching channel

This work explores the influence of double diffusion over thermally radiative flow of thin film hybrid nanofluid and irreversibility generation through a stretching channel.The nanoparticles of silver and alumina have mixed in the Maxwell fluid(base fluid).Magnetic field influence has been employed to channel in normal direction.Equations that are going to administer the fluid flow have been converted to dimension-free notations by using appropriate variables.Homotopy analysis method is used for the solution of the resultant equations.In this investigation it has pointed out that motion of fluid has declined with growth in magnetic effects,thin film thickness,and unsteadiness factor.Temperature of fluid has grown up with upsurge in Brownian motion,radiation factor,and thermophoresis effects,while it has declined with greater values of thermal Maxwell factor and thickness factor of the thin film.Concentration distribution has grown up with higher values of thermophoresis effects and has declined for augmentation in Brownian motion.

Hydraulic Optimization of a Double-channel Pump's Impeller Based on Multi-objective Genetic Algorithm

Computational fluid dynamics（CFD） can give a lot of potentially very useful information for hydraulic optimization design of pumps, however, it cannot directly state what kind of modification should be made to improve such hydrodynamic performance. In this paper, a more convenient and effective approach is proposed by combined using of CFD, multi-objective genetic algorithm（MOGA） and artificial neural networks（ANN） for a double-channel pump＇s impeller, with maximum head and efficiency set as optimization objectives, four key geometrical parameters including inlet diameter, outlet diameter, exit width and midline wrap angle chosen as optimization parameters. Firstly, a multi-fidelity fitness assignment system in which fitness of impellers serving as training and comparison samples for ANN is evaluated by CFD, meanwhile fitness of impellers generated by MOGA is evaluated by ANN, is established and dramatically reduces the computational expense. Then, a modified MOGA optimization process, in which selection is performed independently in two sub-populations according to two optimization objectives, crossover and mutation is performed afterword in the merged population, is developed to ensure the global optimal solution to be found. Finally, Pareto optimal frontier is found after 500 steps of iterations, and two optimal design schemes are chosen according to the design requirements. The preliminary and optimal design schemes are compared, and the comparing results show that hydraulic performances of both pumps 1 and 2 are improved, with the head and efficiency of pump 1 increased by 5.7% and 5.2%, respectively in the design working conditions, meanwhile shaft power decreased in all working conditions, the head and efficiency of pump 2 increased by 11.7% and 5.9%, respectively while shaft power increased by 5.5%. Inner flow field analyses also show that the backflow phenomenon significantly diminishes at the entrance of the optimal impellers 1 and 2, both the area of vortex and intensity of vortex decreases in the whole flow channel. This paper provides a promising tool to solve the hydraulic optimization problem of pumps＇ impellers.

Study on characteristics of a double-conductible channel organic thin-film transistor with an ultra-thin hole-blocking layer

The properties of top-contact organic thin-film transistors （TC-OTFTs） using ultra-thin 2, 9-dimethyl-4, 7- diphenyl-1, 10-phenanthroline （BCP） as a hole-blocking interlayer have been improved significantly and a BCP interlayer was inserted into the middle of the pentacene active layer. This paper obtains a fire-new transport mode of an OTFT device with double-conductible channels. The accumulation and transfer of the hole carriers arc limited by the BCP interlayer in the vertical region of the channel. A huge amount of carriers is located not only at the interface between pentacene and the gate insulator, but also at the two interfaces of pentacene/BCP interlayer and pentacene/gate insulator, respectively. The results suggest that the BCP interlayer may be useful to adjust the hole accumulation and transfer, and can increase the hole mobility and output current of OTFTs. The TC-OTFTs with a BCP interlayer at VDS = --20 V showed excellent hole mobility μFE and threshold voltage VTH of 0.58 cm^2/（V-s） and -4.6 V, respectively.

Fang-Howard wave function modelling of electron mobility in AlInGaN/AlN/InGaN/GaN double heterostructures

To study the electron transport properties in InGaN channel-based heterostructures,a revised Fang-Howard wave function is proposed by combining the effect of GaN back barrier.Various scattering mechanisms,such as dislocation impurity(DIS)scattering,polar optical phonon(POP)scattering,piezoelectric field(PE)scattering,interface roughness(IFR)scattering,deformation potential(DP)scattering,alloy disorder(ADO)scattering from InGaN channel layer,and temperature-dependent energy bandgaps are considered in the calculation model.A contrast of AlInGaN/AlN/InGaN/GaN double heterostructure(DH)to the theoretical AlInGaN/AlN/InGaN single heterostructure(SH)is made and analyzed with a full range of barrier alloy composition.The effect of channel alloy composition on InGaN channel-based DH with technologically important Al(In,Ga)N barrier is estimated and optimal indium mole fraction is 0.04 for higher mobility in DH with Al_(0.4)In_(0.07)Ga_(0.53)N barrier.Finally,the temperature-dependent two-dimensional electron gas(2DEG)density and mobility in InGaN channel-based DH with Al_(0.83)In_(0.13)Ga_(0.04)N and Al_(0.4)In_(0.07)Ga_(0.53)N barrier are investigated.Our results are expected to conduce to the practical application of InGaN channel-based heterostructures.

Two-dimensional analytical models for asymmetric fully depleted double-gate strained silicon MOSFETs

This paper develops the simple and accurate two-dimensional analytical models for new asymmetric double-gate fully depleted strained-Si MOSFET. The models mainly include the analytical equations of the surface potential, surface electric field and threshold voltage, which are derived by solving two dimensional Poisson equation in strained-Si layer. The models are verified by numerical simulation. Besides offering the physical insight into device physics in the model, the new structure also provides the basic designing guidance for further immunity of short channel effect and draininduced barrier-lowering of CMOS-based devices in nanometre scale.

Control of Beam Halo-Chaos for an Intense Charged-Particle Beam Propagating Through Double Periodic Focusing Field by Soliton

We study an intense beam propagating through the double periodic focusing channel by the particle-coremodel,and obtain the beam envelope equation.According to the Poincare-Lyapunov theorem,we analyze the stabilityof beam envelope equation and find the beam halo.The soliton control method for controlling the beam halo-chaos isput forward based on mechanism of halo formation and strategy of controlling beam halo-chaos,and we also prove thevalidity of the control method,and furthermore,the feasible experimental project is given.We perform multiparticlesimulation to control the halo by using the soliton controller.It is shown that our control method is effective.We alsofind the radial ion density changes when the ion beam is in the channel,not only the halo-chaos and its regeneration canbe eliminated by using the nonlinear control method,but also the density uniformity can be found at beam's centre aslong as an appropriate control method is chosen.

分岔结构处双乳液滴的动力学特性研究

复合液滴在化工、医药和生物检测等领域有着广泛的应用,尺寸以及壳层厚度是复合液滴应用过程中的关键特征参数,研究复合液滴的动力学特性对建立相应的操控方法具有重要意义,有助于进一步实现复合液滴的按需制备.采用微流控技术制备了Y形和T形两种分岔结构,研究了双重乳化液滴(双乳液滴)在分岔结构处的流动行为.根据内、外液滴的分裂次数,将流动模式划分为二次分裂、一次分裂和不分裂3种.分析了流动模式的转变规律以及液滴长度对流动模式转变的影响,通过内、外液滴延伸长度、颈部宽度和缝隙宽度等特征参数的演化过程,将液滴运动过程划分为3个阶段,不分裂模式下为挤压、过渡和恢复,一次分裂以及二次分裂模式下为挤压、过渡和断裂,并讨论了相应的动力学机制.发现液滴长度的增加能有效降低液滴与通道之间的间隙宽度,导致双乳液滴所受的挤压力与剪切力增加,有利于液滴的分裂.基于比较成熟的单乳液滴理论,分别建立了内、外液滴的临界分裂条件,T形分岔结构的分裂临界线高于Y形,并进一步构建了内、外液滴毛细数和初始长度决定的流动模式分布图,可以很好地划分不同模式的分布区域,对于调控双乳液滴特性参数具有重要参考价值.

簇状分布的刚性双层植被明渠紊流特性分析

采用RNG k-ε紊流模型,对簇状分布的刚性双层植被明渠水流进行了模拟和分析;根据时间及空间的双平均方法对植被明渠水流的流速及紊动参数进行了统计。结果表明:簇状分布的植被明渠水流可以分为植物区、间隙区及主流区,不同区域时均流速的大小和分布各异;双层植被明渠水流中,时均流速垂线分布在近床面、低植物顶部附近及高植物顶部附近均出现拐点,脉动强度和紊动能的最大值出现在高植物顶部附近。

关节镜下足跟内侧双通道技术治疗跖筋膜炎

2021年5月~2022年10月,我们采用关节镜下足跟内侧双通道技术治疗11例跖筋膜炎患者,疗效满意,报道如下。1材料与方法1.1病例资料本组11例,男4例,女7例,年龄49~71岁。右足8例,左足3例。病程6~24个月。术前X线片显示均有跟骨骨刺。1.2手术方法腰硬联合麻醉下手术。患者仰卧位。对患侧内踝骨性标志做标记,于足跟内侧与足底交界处标记跖筋膜走行水平线,分别以内踝后缘及尖端向跖筋膜水平线做垂线.

腹腔镜下应用硬膜外针带双色线法经皮单通道穿刺腹膜外内环结扎术治疗小儿腹股沟疝的临床效果

目的探讨腹腔镜下应用硬膜外针带双色线法经皮单通道穿刺腹膜外内环结扎术治疗小儿腹股沟疝的临床价值。方法选取2019年7月至2022年7月在萍乡市人民医院小儿外科行腹腔镜下经皮穿刺腹膜外内环口结扎术的514例资料完整的腹股沟疝患儿作为研究对象,按照单双通道穿刺的不同分为双通道穿刺组(273例)和单通道穿刺组(241例),其中2019年7月至2021年5月患儿采用硬膜外针带线经皮双通道穿刺完成腹膜外结扎术,2021年6月至2022年7月患儿采用硬膜外针带双色线法单通道经皮穿刺完成腹膜外结扎术。比较两组患儿的单/双侧、手术时间、穿刺点硬结、线结反应、腹股沟区疼痛及复发率等指标。结果两组患儿术后腹股沟区疼痛及疝复发率的比较,差异无统计学意义(P>0.05),单通道穿刺组手术时间短于双通道穿刺组,穿刺点硬结及线结反应发生率低于双通道穿刺组,差异有统计学意义(P<0.05)。结论腹腔镜下应用硬膜外针带双色线法经皮单通道穿刺腹膜外内环结扎术治疗小儿腹股沟疝,是一种安全有效的手术方法,可简化操作、缩短手术操作时间,降低穿刺点硬结及线结反应发生率,有利于在基层地区医院推广。

经皮单通道与经皮单侧双通道脊柱内镜下腰椎间盘切除术治疗腰椎间盘突出症的临床疗效比较

目的 比较经皮单通道脊柱内镜下腰椎间盘切除术(PELD)与经皮单侧双通道脊柱内镜下腰椎间盘切除术(UBED)治疗腰椎间盘突出症(LDH)的临床疗效。方法 2019年6月~2022年6月本院行经皮脊柱内镜下腰椎间盘切除术治疗的LDH病人102例,按治疗方法分为两组,PELD组51例,行PELD治疗;UBED组51例,行UBED治疗。比较两组手术时间,术中出血量,住院时间,术后椎管横截面积、椎间孔中部矢状径、椎间孔面积等影像学指标,疼痛视觉模拟量表(VAS),Oswestry功能障碍指数(ODI)及手术疗效,记录两组硬膜撕裂、血肿等并发症发生情况。结果 两组手术时间、术后卧床时间、住院时间比较,差异无统计学意义(P>0.05);PELD组术中透视次数为(6.62±1.11)次,多于UBED组的(3.24±0.72)次,PELD组术中出血量为(21.56±4.79)ml,少于UBED组的(38.59±7.82)ml(P<0.05)。PELD组与UBED组术后VAS、ODI评分均较术前降低(P<0.05)。PELD组与UBED组术后椎管横截面积、椎间孔中部矢状径、椎间孔面积等影像学指标均较术前显著改善(P<0.05),但两组术后的各影像学指标比较,差异无统计学意义(P>0.05)。PELD组与UBED组均有较高手术优良率,但两组间比较差异无统计学意义(P>0.05)。两组手术相关并发症发生率比较,差异无统计学意义(Fisher精确概率=0.999)。结论 PELD与UBED治疗LDH的临床疗效相当,但前者术中出血量较少,后者术中透视次数较少,受到的辐射较小。

基于部分能量耦合线圈的无线能量与信号同步传输方法研究

针对无线电能传输系统中能量发送端与接收端进行全双工通信的需求,提出一种基于部分能量耦合线圈的无线能量与信号同步传输方法。利用能量耦合线圈的内侧和外侧部分线圈分别作为信号正反向传输耦合机构,并在信号接收回路中采用LC并联支路抑制同侧信号载波的串扰。通过构建系统模型,分析能量传输与信号传输的增益以及系统传输干扰,得到系统参数对传输特性影响规律。为提高信号传输增益以及减小信号正反向传输之间的串扰,优化了耦合机构线圈布置方案。最后,搭建了传输功率为20 W的无线能量与信号全双工同步传输平台,实验结果表明,在电能传输不受影响的同时,实现了正向传输速率200 kbps、反向传输速率400 kbps的信号全双工同步传输,验证了所提方法的可靠性和有效性。

诊改理念赋能“双高”建设的实践探索——以湖南工业职业技术学院为例

内部质量保证体系诊断与改进是实现职业教育治理的重要举措,是实现“双高”建设任务和目标的重要抓手。文章以正在实施“双高”建设的湖南工业职业技术学院为例,借鉴PDCA循环思想,构建“十一横五纵”的质量保证体系诊断与改进框架,打造“8”字诊改螺旋,形成激励机制与质量文化。通过落实主体责任,质量意识和质量文化深入人心;准确掌握诊改方法,工作效率明显提升;理念赋能,办学成效不断显现。进而得出结论:在职业教育高质量发展阶段,诊改体制机制需与时俱进,数据专业化处理需进一步改善,质量文化需进一步更新迭代。

基于GaAs E/D PHEMT工艺的Ku波段双通道幅相控制多功能芯片

基于GaAs增强/耗尽型赝配高电子迁移率晶体管(E/D PHEMT)工艺设计了一款14~18 GHz的双通道多功能芯片。芯片集成了单刀双掷(SPDT)开关、6 bit数控移相器、4 bit数控衰减器和增益补偿放大器。采用正压控制开关以减小控制位数;优化移相、衰减和放大等电路拓扑结构,以获得良好的幅相特性;采用紧凑布局、双通道对称的版图设计,以实现小尺寸和高性能。测试结果表明,+5 V电压下,接收通道增益大于3 dB,1 dB压缩点输出功率大于8 dBm;发射通道增益大于1 dB,1 dB压缩点输出功率大于2 dBm;64态移相均方根误差小于2.5°,16态衰减均方根误差小于0.3 dB,芯片尺寸为3.90 mm×2.25 mm。该多功能芯片可实现对射频信号幅度和相位的高精度控制,可广泛应用于微波收发模块。

单侧双通道脊柱内镜技术治疗腰椎间盘突出症的效果观察及护理研究

目的探讨LDH的治疗及护理方法。方法回顾性收集80例LDH患者的临床资料,根据治疗方法的不同分为两组,各40例。对照组:采用椎间盘后路摘除术,观察组采用单侧双通道脊柱内镜下髓核摘除术,两组均予以常规护理与术后康复锻炼。观察两组临床效果。结果观察组手术时间长于对照组,但手术出血量、术后下床活动时间、住院时间低于对照组(t=3.01~20.87,P<0.01);观察组术后疼痛及ODI改善程度均优于对照组(t=7.45,10.14;P<0.01);观察组并发症发生率低于对照组(χ^(2)=4.49,P=0.034)。结论单侧双通道脊柱内镜下髓核摘除术治疗LDH效果更优。

基于GRU和LSTM组合模型的车联网信道分配方法

针对车联网中高通信需求和高移动性造成的车对车链路(Vehicle to Vehicle,V2V)间的信道冲突及网络效用低下的问题,提出了一种基于并联门控循环单元(Gated Recurrent Unit,GRU)和长短期记忆网络(Long Short-Term Memory,LSTM)的组合模型的车联网信道分配算法。算法以降低V2V链路信道碰撞率和空闲率为目标,将信道分配问题建模为分布式深度强化学习问题,使每条V2V链路作为单个智能体,并通过最大化每回合平均奖励的方式进行集中训练、分布式执行。在训练过程中借助GRU训练周期短和LSTM拟合精度高的组合优势去拟合深度双重Q学习中Q函数,使V2V链路能快速地学习优化信道分配策略,合理地复用车对基础设施(Vehicle to Infrastructure,V2I)链路的信道资源,实现网络效用最大化。仿真结果表明,与单纯使用GRU或者LSTM网络模型的分配算法相比,该算法在收敛速度方面加快了5个训练回合,V2V链路间的信道碰撞率和空闲率降低了约27%,平均成功率提升了约10%。