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。

Constructing generalized Drinfel'd quantum double

Let H be a Hopf algebra and B an algebra with two linear maps δ, τ： H H→B. The necessary and sufficient conditions for the twisted crossed product B#^τδH equipped with the tensor product coalgebra structure to be a bialgebra are proved. Then, B#^τδH is a coquasitriangular Hopf algebra under certain conditions. This coquasitriangular Hopf algerbra generalizes some known cross products. Finally, as an application, an explicit example is given.

2D materials modulating layered double hydroxides for electrocatalytic water splitting

Exploring highly efficient electrochemical water splitting catalysts has recently attracted extensive research interest from both fundamental researches and practical applications.Transition metal‐based layered double hydroxides(LDHs)have been proved to be one of the most efficient materials for oxygen evolution reaction(OER),however,still suffered from low conductivity and sluggish kinetics for hydrogen evolution reaction(HER),which largely inhibited the overall water splitting efficiency.To address this dilemma,enormous approaches including doping regulation,intercalation tuning and defect engineering are therefore rationally designed and developed.Herein,we focus on the recent exciting progress of LDHs hybridization with other two‐dimensional(2D)materials for water splitting reactions,not barely for enhancing OER efficiency but also for boosting HER activity.Particularly,the structural features,morphologies,charge transfer and synergistic effects for the heterostructure/heterointerface that influence the electrocatalytic performance are discussed in details.The hybrid 2D building blocks not only serve as additional conductivity and structural supported but also promote electron transfer at the interfaces and further enhance the electrocatalytic performance.The construction and application of the nanohybrid materials will guide a new direction in developing multifunctional materials based on LDHs,which will contribute to energy conversion and storage.

3D Particle Image Velocimetry Test of Inner Flow in a Double Blade Pump Impeller

The double blade pump is widely used in sewage treatment industry,however,the research on the internal flow characteristics of the double blade pump with particle image velocimetry（PIV） technology is very little at present.To reveal inner flow characteristics in double blade pump impeller under off-design and design conditions,inner flows in a double blade pump impeller,whose specific speed is 111,are measured under the five off-design conditions and design condition by using 3D PIV test technology.In order to ensure the accuracy of the 3D PIV test,the external trigger synchronization system which makes use of fiber optic and equivalent calibration method are applied.The 3D PIV relative velocity synthesis procedure is compiled by using Visual C＋＋ 2005.Then absolute velocity distribution and relative velocity distribution in the double blade pump impeller are obtained.Test results show that vortex exists in each condition,but the location,size and velocity of vortex core are different.Average absolute velocity value of impeller outlet increases at first,then decreases,and then increases again with increase of flow rate.Again average relative velocity values under 0.4,0.8,and 1.2 design condition are higher than that under 1.0 design condition,while under 0.6 and 1.4 design condition it is lower.Under low flow rate conditions,radial vectors of absolute velocities at impeller outlet and blade inlet near the pump shaft decrease with increase of flow rate,while that of relative velocities at the suction side near the pump shaft decreases.Radial vectors of absolute velocities and relative velocities change slightly under the two large flow rate conditions.The research results can be applied to instruct the hydraulic optimization design of double blade pumps.

Chemical Modifications of Layered Double Hydroxides in the Supercapacitor

Layered double hydroxides are one class or kind of 2 D layered materials that are considered promising for use in the supercapacitor.Although there have been many studies on the structure,composition,properties,and electrode fabrication of layered double hydroxides,none summarize the effects of various modification methods on the structure and performance of layered double hydroxides in the supercapacitor.In a bid to fill this gap,in this review,we summarize the progress of modification methods such as exfoliation,intercalation,vacancy,doping,phase transformation,and composition regulation of layered double hydroxides in the field of the supercapacitor and put forward some opinions regarding the progress of research on the methods used in modifying the layered double hydroxides.

3D Hierarchical Co–Al Layered Double Hydroxides with Long-Term Stabilities and High Rate Performances in Supercapacitors

Three-dimensional(3D) flower-like Co–Al layered double hydroxide(Co–Al-LDH) architectures composed of atomically thin nanosheets were successfully synthesized via a hydrothermal method in a mixed solvent of water and butyl alcohol. Owing to the unique hierarchical structure and modification by butyl alcohol, the electrochemical stability and the charge/mass transport of the Co–Al-LDHs was improved. When used in supercapacitors, the obtained Co–Al-LDHs deliver a high specific capacitance of 838 Fg^(-1) at a current density of 1 Ag^(-1)and excellent rate performance(753 Fg^(-1) at 30 Ag^(-1) and 677 Fg^(-1) at 100 Ag^(-1)), as well as excellent cycling stability with 95% retention of the initial capacitance even after 20,000 cycles at a current density of 5 Ag^(-1). This work provides a promising alternative strategy to enhance the electrochemical properties of supercapacitors.

基于DID模型分析轻盈祛浊汤治疗痰湿瘀阻型糖尿病肾病的远期疗效及对维生素D水平的影响

目的:基于双重差分法(DID)模型分析轻盈祛浊汤治疗痰湿瘀阻型糖尿病肾病(DN)的远期疗效及对血清25羟基维生素D[25(OH)D]水平的影响。方法:前瞻性选取2020年6月至2022年6月于该院就诊的痰湿瘀阻型DN患者120例,按照随机数字表法分为对照组和观察组,各60例。对照组患者接受常规西医标准化治疗,观察组患者在对照组的基础上予以轻盈祛浊汤治疗。比较两组患者的临床疗效,炎症因子、血钙、血磷和25(OH)D水平,采用DID模型对比两组患者治疗前后不同时间点(治疗前,治疗后1、2、3及6个月)的血清25(OH)D水平。结果:随访6个月,无1例失访。观察组患者的总有效率[93.33%(56/60)]较对照组[78.33%(47/60)]升高,差异有统计学意义(P<0.05)。观察组患者随访结束时肿瘤坏死因子α、白细胞介素(IL)6和IL-1β水平低于对照组,血钙水平高于对照组,血磷水平低于对照组,差异均有统计学意义(P<0.05)。血清25(OH)D水平在时间、组间、时间-组间交互项的差异均有统计学意义(P<0.05);DID回归模型显示,两组治疗前的差分效应量为0.844,且差异无统计学意义(P=0.329>0.1),满足平行趋势假设;两组治疗后的差分效应量为-1.878,且差异有统计学意义(P<0.05),即说明在治疗后各时间点,观察组的效应值明显高于对照组;双重差分效应值为-2.722,且差异有统计学意义(P=0.005)。结论:轻盈祛浊汤能上调痰湿瘀阻型DN患者维生素D水平,改善钙磷水平,减轻炎症水平,提高疗效。

基于d-q理论的双馈异步电机定子匝间短路故障诊断方法

为实现双馈异步电机定子绕组匝间短路的早期故障诊断,提出一种基于转子电流特征频率分量的故障诊断方法 .首先,通过分析故障后电机的电磁特性,得到故障后转子电流中会产生特征频率分量的结论 .然后,通过对转子单相电流进行特殊的相移构造出三相电流,并对该组电流进行d-q变换,利用理论推导证明d-q变换后的直流分量幅值能够反映特征谐波的大小,将直流分量作为故障特征量进行双馈异步电机匝间短路故障的诊断.最后,依据有限元法建立故障前后电机的仿真模型,对不同工况下故障特征量的变化进行研究.结果表明:基于d-q理论提取的故障特征量与定子绕组的短路匝数呈正相关,且在转速变化和电压不平衡时也可有效诊断出匝间短路故障;通过设置合理的故障阈值可实现对双馈异步电机定子绕组匝间短路故障的精确辨识.研究结果可以为电机绕组匝间短路故障诊断提供参考.

An Improved Power Efficient Clock Pulsed D Flip-flop Using Transmission Gate

Recent digital applications will require highly efficient and high-speed gadgets and it is related to the minimum delay and power consumption.The proposed work deals with a low-power clock pulsed data flip-flop(D flip-flop)using a transmission gate.To accomplish a power-efficient pulsed D flip-flop,clock gating is proposed.The gated clock reduces the unnecessary switching of the transistors in the circuit and thus reduces the dynamic power consumption.The clock gating approach is employed by using an AND gate to disrupt the clock input to the circuit as per the control signal called Enable.Due to this process,the clock gets turned off to reduce power consumption when there is no change in the output.The proposed transmission gate-based pulsed D flip-flop’s performance with clock gating and without clock gating circuit is analyzed.The proposed pulsed D flip-flop power consumption is 1.586μw less than the without clock gated flip-flop.Also,the authors have designed a 3-bit serial-in and parallel-out shift register using the proposed D flip-flop and analyzed the performance.Tanner Electronic Design Automation tool is used to simulate all the circuits with 45 nm technology.

高剂量维生素D结合双C方案治疗妊娠期糖尿病的效果及对胰岛功能、妊娠结局的影响

目的 分析高剂量维生素D结合双C方案治疗妊娠期糖尿病的效果及对胰岛功能、妊娠结局的影响。方法 选取2021年3月至2023年3月诊治的100例妊娠期糖尿病患者为研究对象,将其随机分为对照组和观察组,各50例。对照组采用双C方案治疗,观察组在对照组基础上加高剂量维生素D治疗。比较两组的治疗效果。结果 治疗后,观察组的空腹血糖(FPG)、餐后2 h血糖(2 h PG)水平及糖化血红蛋白(Hb A1c)低于对照组,差异具有统计学意义(P<0.05)。治疗后,观察组的胰岛β细胞功能指数(HOMA-β)、胰岛素抵抗指数(HOMA-IR)、果糖胺(FMN)及空腹C肽(FCP)水平低于对照组,胰岛素敏感指数(ISI)高于对照组,差异具有统计学意义(P<0.05)。观察组的不良妊娠结局总发生率低于对照组,新生儿Apgar评分高于对照组,差异具有统计学意义(P<0.05)。结论 高剂量维生素D结合双C方案治疗妊娠期糖尿病的效果显著,能有效调节胰岛功能,改善妊娠结局,值得推广。

Dynamic Interference Photoelectron Spectra in Double Ionization:Numerical Simulation of 1D Helium

We report our numerical simulation on the dynamic interference photoelectron spectra for a one-dimensional （1D） He model exposed to intense ultrashort extreme ultraviolet （XUV） laser pulses. The results demonstrate an unambiguous interference feature in the photoelectron spectra, and the interference is unveiled to originate from the dynamic Stark effect. The interference photoelectron spectra are prompted for intense sub-femtosecond XUV laser pulses in double ionization. The stationary phase picture is corroborated qualitatively in the two-electron system. The ability of probing the dynamic Stark effect by the photoelectron spectra in a pragmatic experiment of single-photon double ionization of He may shed light on further investigation on multi-electron atoms and molecules.

One-Stage Correction with Intra- and Extraatrial Rerouting of Anomalous Systemic and Pulmonary Venous Return and Intraventricular Repair of Double Outlet Right Ventricle in a Patient with Heterotaxy Syndrome

We report a very rare case of successful intracardiac correction in a patient with heterotaxy syndrome.The cardiac malformations included dextrocardia,double outlet right ventricle,pulmonary stenosis,interrupted inferior vena cava,hemiazygos continuation and total anomalous pulmonary venous return.One-stage correction was performed.The atrial procedure consisted of intra-and extraatrial rerouting of the anomalous systemic and pulmonary venous return.The hepatic veins were detached and diverted to the left atrium via an extracardiac conduit.The correction of the double outlet right ventricle was accomplished by intraventricular redirection of the blood flow from the left ventricle to the aorta.The right ventricular outflow was ultimately remodeled using a valved conduit.For better perception of the complex morphology,a three-dimensional model was designed,using CT scan images.This proved to be very useful for surgical planning,especially with regard to the intraatrial reconstruction of the systemic and pulmonary venous rerouting.

急性痛风性关节炎患者外周血黑色素瘤缺乏因子2信号通路相关细胞因子及焦孔素D表达变化观察

目的观察急性痛风性关节炎患者外周血黑色素瘤缺乏因子2(AIM2)炎症小体信号通路相关细胞因子[AIM2、双链DNA(dsDNA)、IL-1β、IL-18]及焦孔素D表达变化,并分析单个核细胞中AIM2、焦孔素D与急性痛风性关节炎患者病情[WBC、PLT、ESR、CRP、IL-1β、IL-18、BMI、UA、BUN、肌酐(SCr)、肌酐清除率(CCr)、TG、TC]的关系,以探讨AIM2炎症小体信号通路介导的细胞焦亡在急性痛风性关节炎发生、发展中的作用。方法纳入30例急性痛风性关节炎患者(观察组)和30例健康对照者(对照组),比较两组外周血单个核细胞(PBMCs)中AIM2、焦孔素D及血清中IL-1β、IL-18、双链DNA(dsDNA)水平。采用Spearman相关分析AIM2 mRNA和焦孔素D mRNA与急性痛风性关节炎患者病情相关指标(IL-1β、IL-18、WBC、PLT、ESR、CRP、BMI、UA、BUN、SCr、CCr、TG、TC)的关系。结果与对照组比较,观察组PBMCs中AIM2和焦孔素D mRNA的表达水平高(P均<0.05),血清dsDNA、IL-1β、IL-18水平高(P均<0.01)。PBMCs中AIM2 mRNA与WBC、ESR、CRP、BMI、TC、TG、sCr正相关(P均<0.05),焦孔素D mRNA与ESR、IL-1β、sCr正相关(P均<0.05)。结论急性痛风性关节炎患者外周血PBMCs中AIM2、焦孔素D及血清中dsDNA、IL-1β、IL-18水平均升高,AIM2炎症小体介导的细胞焦亡可能参与了急性痛风性关节炎的发生、发展。

Research on the Construction of Synergetic innovation Model of the R＆D Center of Modem Logistics Based on College-enterprise Double Subject

Synergetic innovation of college-enterprise in China has initial development, but difficult to demonstrate the operation and performance. College-enterprise double subject deepen integration between colleges and enterprises, colleges and enterprises to effectively integrate community resources and improve the effectiveness and efficiency of college-enterprise cooperation. Starting from the practice of college-enterprise double subject, the article builds a synergetic innovation model of the R＆D Center of Modern Logistics, and put forward countermeasures and suggestions of its operations and security.

维生素D滴剂联合双C方案对妊娠期糖尿病患者血糖及母婴结局的影响

目的 分析妊娠期糖尿病患者接受维生素D滴剂联合双C方案的干预效果。方法 回顾性选取2023年6月—2024年2月泉州市第一医院收治的98例妊娠期糖尿病患者的临床资料,以治疗方案的不同分对照组、观察组,各49例。对照组实施双C干预,观察组在对照组基础上联合维生素D滴剂治疗。对比两组血糖指标、胰岛功能、母婴结局。结果 干预后,观察组餐后2 h血糖、空腹血糖、胰岛素抵抗指数、不良母婴结局发生率均低于对照组,胰岛素分泌指数高于对照组,差异有统计学意义(P均<0.05)。结论 双C方案联合维生素D滴剂协同干预能够改善妊娠期糖尿病患者的胰岛素分泌、血糖水平,有效遏制不良母婴结局的发生。

The Layout and Simulation of Logarithmic Spiral Double Curved Arch Dam Transverse Joints

Because of its good condition with mechanics, logarithmic spiral double curve arch bam has been widely used in the practical engineering. The introduction of a new method in how to divide transverse joint in arch dam will be given and the further research of its calculation has been done. The C＋＋ is used in electronic procedure and the 3D simulation has been finished with AutoCAD, which will provide the object model for computer simulation of the arch dam and the division of finite element mesh. Meanwhile, this method in dividing the transverse joint in arch dam also can be taken as the calculated basis for the design and calculation of arch dam, construction lofting and the calculation of the work amount.

Solution-processed all-inorganic lead halide perovskite/layered double hydroxides superlattices

Quantum wells and superlattices are key building blocks in the semiconductor industry,normally fabricated using epitaxial growth techniques,such as vapor phase epitaxy,metalorganic chemical vapor deposition and molecular beam epitaxy.However,these complicated preparation processes,as well as their high cost,limit their extensive applications.It is essential to develop a simple solution process for building superstructures.Here,we demonstrate an ion exchange strategy for synthesizing an allinorganic superlattice cesium lead bromide/layered double hydroxides(CsPbBr_3/LDH)in solution.At room temperature,the perovskite ions diffuse into the interlayer of LDH and assemble into layered perovskite with various thicknesses.Compared with traditional organic-inorganic hybrid perovskite superlattice,the all-inorganic perovskite superlattice CsPbBr_(3)/LDH has weak quantum confinement,which exhibits narrow emission line-widths of 20 nm,high quantum yields of 55%,and radiative lifetimes of several ns.Our findings offer a new route to synthesize novel perovskite superlattices and enrich the perovskite supercrystal platform for electronics,photonics and optoelectronics devices.

维生素D联合“双C”方案治疗妊娠期糖尿病的效果及对胰岛素抵抗、VCAM-1、AOPP水平的影响

目的分析维生素D联合“双C”方案治疗妊娠期糖尿病的效果及对胰岛素抵抗、血管细胞黏附分子-1(VCAM-1)、晚期氧化蛋白产物(AOPP)水平的影响。方法选择2019年7月至2021年7月来我院诊治的82例妊娠期糖尿病患者作为研究对象,按照抛硬币法将其分为对照组与研究组,每组41例。对照组采用“双C”方案治疗,研究组采用维生素D联合“双C”方案治疗。比较两组的治疗效果。结果治疗14 d后,研究组的空腹血糖(FPG)、空腹胰岛素(FINS)及胰岛素抵抗指数(HOMA-IR)低于对照组,胰岛素分泌指数(HOMA-β)高于对照组(P<0.05)。治疗14 d后,研究组的脂联素(APN)水平高于对照组,内脂素(visfatin)、瘦素水平低于对照组(P<0.05)。治疗14 d后,研究组的VCAM-1、Toll样受体2(TLR2)、Toll样受体4(TLR4)、AOPP水平低于对照组(P<0.05)。研究组的不良妊娠结局总发生率为9.76%,显著低于对照组的26.83%(P<0.05)。结论维生素D联合“双C”方案治疗妊娠期糖尿病的效果显著,临床可进一步推广运用。

维生素D联合“双C”方案治疗妊娠期糖尿病的临床效果

目的探讨维生素D(VD)联合“双C”方案治疗妊娠期糖尿病(GDM)的临床效果。方法选取2019年1月至2021年1月广西壮族自治区江滨医院妇产科收治的89例GDM患者,按随机数字表法分为观察组(n=45)和对照组(n=44)。对照组给予“双C”方案,观察组给予VD联合“双C”方案。比较两组VD缺乏情况、空腹血糖(FBG)、餐后2 h血糖(2 h PG)、糖化血红蛋白(HbA1c)、空腹胰岛素(FINS)、胰岛素抵抗指数(HOMA-IR)及不良妊娠结局。结果治疗后,观察组VD缺乏程度较治疗前改善,且优于对照组(P<0.05)。治疗后,两组FBG、2 h PG、HbA1c、FINS及HOMA-IR均低于治疗前,且观察组低于对照组(P<0.05)。观察组不良妊娠结局总发生率低于对照组(P<0.05)。结论VD联合“双C”方案治疗GDM,可有效控制血糖,改善VD缺乏程度,降低不良妊娠结局风险。

双D形管高效换热平行流蒸发器设计

为提升集液管封堵的可靠性,使其更加适用于高压力工况,进一步提高换热效率,设计了一种双D形管平行流冷凝器。设计的双D形管平行流冷凝器主要包括两层芯体、第一双D形管A、第二双D形管B。其长度方向的剖面为D形第一管体、D形板的第一插板、第一插槽、第二插槽等。通过设置第四插板,有效地均匀输送流体,延长了流体路径,提高了平行流蒸发器的热交换效率。第一插板插入第一插槽内实现了双D形管端部,并通过焊接的方式实现封堵,可承受更大的流体压力,封堵可靠性高。双D形管平行流冷凝器在减轻重量、提高集液管封堵的可靠性以及换热效率等方面具有突出优势,是我国汽车空调行业推广应用平行流冷凝器向轻量化、节能、环保方向发展的必然趋势,具有广阔的市场应用前景。