Radiative heat transfer analysis of a concave porous fin under the local thermal non-equilibrium condition:application of the clique polynomial method and physics-informed neural networks

The heat transfer through a concave permeable fin is analyzed by the local thermal non-equilibrium(LTNE)model.The governing dimensional temperature equations for the solid and fluid phases of the porous extended surface are modeled,and then are nondimensionalized by suitable dimensionless terms.Further,the obtained nondimensional equations are solved by the clique polynomial method(CPM).The effects of several dimensionless parameters on the fin's thermal profiles are shown by graphical illustrations.Additionally,the current study implements deep neural structures to solve physics-governed coupled equations,and the best-suited hyperparameters are attained by comparison with various network combinations.The results of the CPM and physicsinformed neural network(PINN)exhibit good agreement,signifying that both methods effectively solve the thermal modeling problem.

Finite Element Analysis for Magneto-Convection Heat Transfer Performance in Vertical Wavy Surface Enclosure:Fin Size Impact

The goal of this paper is to represent a numerical study of magnetohydrodynamic mixed convection heat transfer in a lid-driven vertical wavy enclosure with a fin attached to the bottomwall.We use a finite elementmethod based on Galerkin weighted residual(GWR)techniques to set up the appropriate governing equations for the present flow model.We have conducted a parametric investigation to examine the impact of Hartmann and Richardson numbers on the flow pattern and heat transmission features inside a wavy cavity.We graphically represent the numerical results,such as isotherms,streamlines,velocity profiles,local and mean Nusselt numbers,and average surface temperature.Comparisons between the results of this work and previously published work in a literature review have been produced to examine the reliability and consistency of the data.The different sizes of the fin surface significantly impact flow creation and temperature fields.Additionally,the long fin size is necessary to enhance the heat transfer rate on the right surface at large Richardson numbers and low Hartmann numbers.Fin surfaces can significantly increase the mixing of fluid inside the enclosure,which can mean reductions in reaction times and operating costs,along with increases in heat transfer and efficiency.

基于X射线晶圆在线辐照实验的16 nm n-FinFETs总剂量效应模型研究

建立了基于X射线晶圆在线辐照实验的16 nm FinFET总剂量效应模型,并对模型的有效性进行了验证。将辐照后器件等效为一个主晶体管与辐射导致的若干寄生晶体管并联,通过改变寄生晶体管的参数对辐照中的物理机制进行了模拟。对不同鳍片数量的内核(core)和输入输出(input output,IO)n-FinFET建立了能够描述器件在不同漏源电压下工作性能的模型,仿真结果与实验数据对比表明,所建立的模型的相对均方根偏差小于15%。

Semi-analytical investigation of heat transfer in a porous convective radiative moving longitudinal fin exposed to magnetic field in the presence of a shape-dependent trihybrid nanofluid

The thermal examination of a non-integer-ordered mobile fin with a magnetism in the presence of a trihybrid nanofluid(Fe_3O_4-Au-Zn-blood) is carried out. Three types of nanoparticles, each having a different shape, are considered. These shapes include spherical(Fe_3O_4), cylindrical(Au), and platelet(Zn) configurations. The combination approach is utilized to evaluate the physical and thermal characteristics of the trihybrid and hybrid nanofluids, excluding the thermal conductivity and dynamic viscosity. These two properties are inferred by means of the interpolation method based on the volume fraction of nanoparticles. The governing equation is transformed into a dimensionless form, and the Adomian decomposition Sumudu transform method(ADSTM) is adopted to solve the conundrum of a moving fin immersed in a trihybrid nanofluid. The obtained results agree well with those numerical simulation results, indicating that this research is reliable. The influence of diverse factors on the thermal overview for varying noninteger values of γ is analyzed and presented in graphical representations. Furthermore, the fluctuations in the heat transfer concerning the pertinent parameters are studied. The results show that the heat flux in the presence of the combination of spherical, cylindrical, and platelet nanoparticles is higher than that in the presence of the combination of only spherical and cylindrical nanoparticles. The temperature at the fin tip increases by 0.705 759% when the value of the Peclet number increases by 400%, while decreases by 11.825 13% when the value of the Hartman number increases by 400%.

Tbx 4 and Tbx 5 gene expression associated with appendage development and its relationship with the absence of the pelvic fin in Pampus argenteus

The Tbx family is first known through the study of their functions in the body and limbs,and its members Tbx4 and Tbx5 genes are important factors in determining the characteristics of the appendages.Pampus argenteus is one of the important economical marine fishes widely distributed in offshore areas.Therefore,it is necessary to study the role of Tbx family genes in the deletion of pelvic fin in P.argenteus.In this study,we cloned Tbx4 and Tbx5 cDNA sequence of P.argenteus(GenBank:MH709128 and MH712458).The Western blot and real time PCR were used to detect the expressions of Tbx4 and Tbx5 in different developmental stages and tissues of P.argenteus.In addition,whole-mount in-situ hybridization was used to study the localization of Tbx4 and Tbx5 genes in different developmental stages of P.argenteus.Results show that the translation of Tbx4 mRNA was inhibited during the critical period of pelvic fin development.Among different tissues,Tbx4 protein levels were the lowest in the abdominal epithelium,and even lower than that in the pectoral fin,suggesting that the protein expression was also inhibited in the abdominal epithelium of adult P.argenteus.Therefore,the results indicated that upstream genes regulation led to the key stage-specific and low expression of Tbx4 during pelvic fin development and in the abdominal epithelium.

Seismicity patterns before the 2021 Fin (Iran) doublet earthquakes using the region-time-length and time-to-failure methods

Knowledge regarding earthquake hazards and seismicity is crucial for crisis management, and the occurrence of foreshocks, seismic activity patterns, and spatiotemporal variations in seismic activity have been studied. Furthermore, the estimation of the region-time-length (RTL) parameter has been proposed to detect seismic quiescence before the occurrence of a large earthquake. In addition, the time-to-failure method has been used to estimate the time occurrence of large earthquakes. Hence, in this study, to gain deeper insight into seismic activity in the southern Zagros region, we utilized the RTL algorithm to identify the quiescence and activation phases leading to the Fin doublet earthquakes. Temporal variations in the RTL parameter showed two significant anomalies. One corresponded to the occurrence time of the first earthquake (2017-12-12);the other anomaly was associated with the occurrence time of the second event (2021-11-14). Based on a negative value of the RTL parameter observed in the vicinity of the Fin epicenters (2021), seismic quiescence (a decrease in seismicity compared to the preceding background rate) was identified. The spatial distribution of the RTL prognostic parameters confirms the appearance of seismic quiescence surrounding the epicenter of the Fin doublet earthquakes (2021). The time-to-failure method was designed using precursory events that describe the acceleration of the seismic energy release before the mainshock. Using the time-to-failure method for the earthquake catalog, it was possible to estimate both the magnitude and time of failure of the Fin doublet. Hence, the time-tofailure technique can be a useful supplementary method to the RTL algorithm for determining the characteristics of impending earthquakes.

基于Fins/UDP通信协议的采煤机远程监控系统研究

为推进采煤机自动化水平的提升,研究了基于Fins/UDP通信协议的采煤机远程监控系统。详细阐述了Fins/UDP通信协议的报文构成,并构建了适用于煤矿井下采煤机的远程监控系统架构。借助开源的VUE和Flask框架,展开了系统软件的开发。最后,通过一系列实验,对系统的数据采集和指令下发等关键功能进行了验证。实验结果表明,所设计的系统可以实现对采煤机的有效远程监控。

Heat dissipation enhancement method for finned heat sink for AGV motor driver's IGBT module

With the widespread use of high-power and highly integrated insulated gate bipolar transistor(IGBT),their cooling methods have become challenging.This paper proposes a liquid cooling scheme for heavy-duty automated guided vehicle(AGV)motor driver in port environment,and improves heat dissipation by analyzing and optimizing the core component of finned heat sink.Firstly,the temperature distribution of the initial scheme is studied by using Fluent software,and the heat transfer characteristics of the finned heat sink are obtained through numerical analysis.Secondly,an orthogonal test is designed and combined with the response surface methodology to optimize the structural parameters of the finned heat sink,resulting in a 14.57%increase in the heat dissipation effect.Finally,the effectiveness of heat dissipation enhancement is verified.This work provides valuable insights into improving the heat dissipation of IGBT modules and heat sinks,and provides guidance for their future applications.

基于FINS协议的Controller Link网监控系统设计

Controller Link(CLK)网是OMRON开发的一种应用广泛的工厂自动化(FA)网络,其节点为可编程序控制器(PLC)和计算机,FINS是OMRON FA网络的通信协议。CLK网可以实现节点间的数据链接及信息通信功能。在工程应用中,要求在计算机节点上监控网络中的各个PLC节点。该文利用Visual C++6.0设计了基于FINS协议的CLK网监控系统,并成功地用于城市污水处理系统的实时监控。

NPHS1基因Fin-minor突变致中国先天性肾病综合征2例报道并文献复习

目的总结2例先天性肾病综合征芬兰型NPHS1基因Fin-minor突变患儿临床资料,提高对该病的认识。方法报道2例先天性肾病综合征患儿的临床特点。对可能致病基因NPHS1、NPHS2、PLCε1、LAMB2、COQ2和LMX1B外显子和WT1基因第8、9外显子,以及外显子相邻附近区域进行直接测序。对该家系相关成员进行NPHS1基因外显子及附近调控区域直接测序,分析突变位点,并文献综述。结果 2例患儿均于出生后1个月内起病,临床表现为肾病综合征。血清病原学检查均为阴性。家系调查未发现家族中有类似疾病的成员。NPHS1、NPHS2、PLCε1、LAMB2、COQ2、LMX1B和WT1基因分析发现,2例患儿存在双NPHS1基因杂合突变,未发现其他基因有致病性突变。1例患儿为NPHS1基因的p.R1109X(c.3325C>T,Fin-minor)和IVS26DS-2A>T杂合突变,IVS26DS-2A>T剪切突变为首次报道,其父亲携带IVS26DS-2A>T,其母亲携带p.R1109X。1例患儿为NPHS1基因的p.R1109X(c.3325C>T)和p.A1160X(c.3478C>T)杂合突变,其母亲携带p.R1109X突变,未发现p.A1160X突变,其父亲拒绝行NPHS1基因分析。以上发现的突变在100例正常人群中未发现。结论中国先天性肾病综合征儿童不仅有NPHS1基因突变,而且有经典的Fin-minor突变,为国内首报。本研究新发现的IVS26DS-2A>T剪切突变丰富了NPHS1基因突变谱。

Enhancement of natural convection heat transfer from a fin by triangular perforation of bases parallel and toward its tip

This study examines the heat transfer enhancement from a horizontal rectangular fin embedded with triangular perforations （their bases parallel and toward the fin tip） under natural convection. The fin＇s heat dissipation rate is compared to that of an equivalent solid one. The parameters considered are geometrical dimensions and thermal properties of the fin and the perforations. The gain in the heat transfer enhancement and the fin weight reduction due to the perforations are considered. The study shows that the heat dissipation from the perforated fin for a certain range of triangular perforation dimensions and spaces between perforations result in improvement in the heat transfer over the equivalent solid fin. The heat transfer enhancement of the perforated fin increases as the fin thermal conductivity and its thickness are increased.

Wind Tunnel Experimental Investigation on the Aerodynamic Characteristics of the Multifin Rockets and Missiles

The transonic-supersonic wind tunnel experiment on the aerodynamics of the rockets and missiles that have four, six, eight flat or wrap-around fins is introduced. The experimental results show, while M∞〈2.0, with the increase of the fins＇number, the derivative of lift coefficient is increasing, the pressure center is shifting backwards, and the longitudinal static stability is augmenting. On the contrary, while the Mach number exceeds a certain supersonic value, the aerodynamic effectiveness of the eight-fin missiles would be lower than that of the six-fin missiles. For the low speed short-range missiles, by adopting six, eight or ten flat fins configuration, the lift effectiveness can be greatly increased, the pressure center can be shifted backwards, the static and dynamic stability can be obviously enhanced. For the high speed long-range large rockets and missiles launched from multi-tube launcher, the configuration adopting more than six fins can not be useful for increasing the stability but would make the rolling rate instable during the flight.

Lift fin stabilizers based on data fusion with wavelet denoising technology

Fin stabilizers with fin-lift feedback control can shield the mapping error of calculation between the fin angle and fin lift force,which is in the fin stabilizer with fin-angle feedback control.In practice,there are some technical difficulties in lift fin stabilizers,such as lift force detection and lift force sensor installation,so it cannot achieve the good antirolling performance.Therefore,a fin stabilizer system with fin-lift/fin-angle integrated control is brought forward.Data fusion based on wavelet denoising technology is employed in the system,which combines lift with fin angle local information from two sensors with different frequency ranges in order to eliminate redundant and contradictory information,and using complementary information to obtain the relative integrity of the lift force signal.The system model is established in this paper,and the fusion signal and the antirolling performance of this model are simulated respectively.The result shows that the control system can meet the antirolling need in different sea situations.

FinFET纳电子学与量子芯片的新进展

综述了后摩尔时代中两大发展热点:鳍式场效应晶体管(FinFET)纳电子学和基于量子计算新算法的量子芯片的发展历程和近两年的最新进展。在FinFET纳电子学领域,综述并分析了当今Si基互补金属氧化物半导体(CMOS)集成电路的发展现状,包括FinFET的发展、10 nm和7 nm技术节点的量产、5 nm和3 nm技术节点的环栅场效应晶体管(GAAFET)和2 nm技术节点的负电容场效应晶体管(FET)的前瞻性技术研究以及非Si器件(InGaAs FinFET、WS2和MoS2两种2D材料的FET)的探索性研究。指出继续摩尔定律的发展将以Si基FinFET和GAAFET的技术发展为主。在量子芯片领域,综述并分析了超导、电子自旋、光子、金刚石中的氮空位中心和离子阱等五种量子比特芯片的发展历程,提高相干时间、固态化及多量子比特扩展等的技术突破,以及近几年在量子信息应用的新进展。基于Si基的纳米制造技术和新的量子计算算法的结合正加速量子计算向工程化的进展。

基于Modbus/TCP及FINS/TCP协议的数据采集与通讯系统设计

针对棉麻纤维纱线晶变改性系统现场不同协议设备通讯协议不兼容的问题,设计了数据采集与通讯系统。系统以上位机、PLC CJ2M-CPU32和6块数据采集与控制模块ADAM-6017为硬件核心,采用单客户机、多服务器架构。上位机首先基于Modbus/TCP协议读取6块ADAM-6017中的数据进行缓存,整理合并,后基于FINS/TCP协议向PLC集中发送数据。现场数据采集与通讯过程通过在上位机VB环境下编程实现。经现场运行,该系统稳定可靠,满足了设计要求。

丹蛭降糖胶囊对2型糖尿病患者FINS和IRI作用有效性的系统评价

目的:评价丹蛭降糖胶囊对2型糖尿病患者FINS和IRI作用的有效性。方法:计算机检索中国生物医学文献数据库、中国期刊全文数据库、万方期刊数据库等相关资料,按照Cochrane系统评价的方法,客观评价纳入研究的质量,提取有效数据,采用Rev Man 5.2软件进行Meta分析。结果:共纳入5个随机对照试验,包括294例患者。结果显示,丹蛭降糖胶囊能降低2型糖尿病患者FINS[MD=1.24,95%CI(0.90,1.59),P<0.01],降低IRI[MD=0.20,95%CI(0.14,0.27),P<0.01]。结论:丹蛭降糖胶囊对2型糖尿病患者FINS和IRI作用是有效的。

基于FINS协议的计算机与PLC的通信

FINS协议用于OMRON的CompoBus/D、Controller Link、Ethernet等网络以及网络之间的通信。简要介绍了FINS协议,研究了基于FINS协议实现上位机和PLC串行通信的方法。PLC选用OMRON CP1H型机,上位机采用Visual C++6.0编程,调用FINS指令向PLC发送命令,与PLC进行信息交换。给出串口初始化、发送数据和接收数据等各部分程序代码。该方法为进一步开发基于FINS协议的PLC监控系统提供了有价值的参考。

抵当芪桂汤对胰岛素抵抗大鼠血清FFA、ADPN、FINS及胰岛β细胞结构的影响

目的通过观察抵当芪桂汤对胰岛素抵抗(IR)大鼠血清游离脂肪酸(FFA)、脂联素(ADPN)、空腹胰岛素(FINS)的含有量及胰岛β细胞结构的影响,探讨该方防治糖尿病的作用机理。方法将70只SD大鼠随机选取10只作为空白组,其余60只给予高糖、高脂饲料喂养,于第8周末禁食不禁水,次日早晨一次性腹腔注射链脲佐菌素(STZ)35 mg/kg造模,72 h后测定其随机血糖、尿糖,血糖≥16.9 mmol/L、尿糖(+++)或以上为造模成功。将成模大鼠随机分为模型组、盐酸吡格列酮组、抵当芪桂汤常量组和抵当芪桂汤大剂量组,给予相应干预。在干预第8周末检测大鼠血清中ADPN、FFA及FINS含有量,观察大鼠的胰岛β细胞结构的变化情况。结果干预8周后,与模型组比较,各给药组大鼠血清FFA、FINS含有量均有不同程度降低,ADPN则有不同程度的升高,其中以抵当芪桂汤常量组最好;胰岛β细胞的凋亡程度也以抵当芪桂汤常量组最好。结论常规剂量抵当芪桂汤能够降低高脂高糖饮食合并STZ诱导IR大鼠血清FFA、FINS含有量,升高血清ADPN含有量,抑制胰岛β细胞凋亡,保护其结构。

Propulsive performance and flow field characteristics of a 2-D flexible fin with variations in the location of its pitching axis

The thrust coefficients and propulsive efficiency of a two-dimensional flexible fin with heaving and pitching motion were computed using FLUENT. The effect of different locations of the pitching axis on propulsive performance was examined using three deflexion modes which are respectively, modified Bose mode, cantilever beam with uniformly distributed load and cantilever beam with non-uniformly distributed load. The results show that maximum thrust can be achieved with the pitching axis at the trailing edge, but the highest propulsive efficiency can be achieved with the pitching axis either 1/3 of the chord length from the leading edge in modified Bose mode, or 2/3 of the chord length from the leading edge in cantilever beam mode. At the same time, the effects of the Strouhal number and maximal attack angle on the hydrodynamics performance of the flexible fin were analyzed. Parameter interval of the maximum thrust coefficient and the highest propulsive efficiency were gained. If the Strouhal number is low, high propulsive efficiency can be achieved at low αmax , and vice versa.

基于Host Link FINS协议的PLC远程通信

以欧姆龙公司CP1H型号的PLC为应用背景,设计了基于Host Link FINS协议的PLC设备远程监控系统。该文提出了基于串口的远程通信方案,并且详细分析了Host Link FINS协议的结构和指令格式,用MFC实现了监控软件的设计,完成监控软件与欧姆龙PLC的数据通信功能,实现监控软件对PLC的远程监控。经过现场的测试和运行,该监控系统稳定可靠,性能较高。