基于Ribbon的地面设备信息微服务系统负载均衡的实现

随着航天发射场地面设备信息系统的日益复杂,微服务架构成为一种有效的解决方案。文章研究了基于Ribbon的微服务负载均衡技术,分析了该技术在发射场地面设备信息实际系统中的应用。其中,首先介绍了微服务架构和Ribbon负载均衡器的原理,然后详细阐述了利用Ribbon实现地面设备信息微服务负载均衡的方法,包括服务发现、动态负载均衡、容错处理等机制。实际结果表明,基于Ribbon的负载均衡方案能有效提高地面设备信息系统的性能和可靠性。

Electronic and Thermoelectric Properties in SnS-Nanoribbon-Based Heterojunctions

As an earth-abundant and environmentally friendly material,tin sulfide(SnS)is not only a high-performance photovoltaic material,but also a new promising thermoelectric material.Despite extensive research on the thermoelectric properties of this material in recent years,the room-temperature thermoelectric figure of merit(ZT)of SnS has not been broke through 2[2022 Sci.China Mater.651143].In this work,based on a combination of density functional theory and non-equilibrium Green’s function method,the electronic and thermoelectric properties in SnS-nanoribbon-based heterojunctions are studied.The results show that although SnS nanoribbons(SNSNRs)with zigzag edges(ZSNSNRs)and armchair edges(ASNSNRs)both have semiconductor properties,the bandgaps of ASNSNRs are much wider than those of ZSNSNRs,which induces much wider conductance gaps of𝑁N-ASNSNR(N is the number of tin-sulfide lines across the ribbon width)).In the positive energy region,the ZT peaks of𝐿L-SNS-Au are much larger than those of𝐿L-SNS-GNR(L represents the number of longitudinal repeating units of SNSNR in the scattering region).While in the positive energy region,the ZT peaks of L-SNSGNR are larger than those of L-SNS-Au.Further calculations reveal that the figure of merit will be over 3.7 in L-SNS-Au and 2.2 in L-SNS-GNR at room temperature,and over 4 in L-SNS-Au and 2.6 in L-SNS-GNR at 500 K.

Damage Mechanism of Ultra-thin Asphalt Overlay(UTAO) based on Discrete Element Method

Aiming to analyze the damage mechanism of UTAO from the perspective of meso-mechanical mechanism using discrete element method(DEM),we conducted study of diseases problems of UTAO in several provinces in China,and found that aggregate spalling was one of the main disease types of UTAO.A discrete element model of UTAO pavement structure was constructed to explore the meso-mechanical mechanism of UTAO damage under the influence of layer thickness,gradation,and bonding modulus.The experimental results show that,as the thickness of UTAO decreasing,the maximum value and the mean value of the contact force between all aggregate particles gradually increase,which leads to aggregates more prone to spalling.Compared with OGFC-5 UTAO,AC-5 UTAO presents smaller maximum and average values of all contact forces,and the loading pressure in AC-5 UTAO is fully diffused in the lateral direction.In addition,the increment of pavement modulus strengthens the overall force of aggregate particles inside UTAO,resulting in aggregate particles peeling off more easily.The increase of bonding modulus changes the position where the maximum value of the tangential force appears,whereas has no effect on the normal force.

Mild polarization electric field in ultra-thin BN-Fe-graphene sandwich structure for efficient nitrogen reduction

The electrocatalytic N_(2)reduction reaction(NRR)is expected to supersede the traditional Haber-Bosch technology for NH3 production under ambient conditions.The activity and selectivity of electrochemical NRR are restricted to a strong polarized electric field induced by the catalyst,correct electron transfer direction,and electron tunneling distance between bare electrode and active sites.By coupling the chemical vapor deposition method with the poly(methyl methacylate)-transfer method,an ultrathin sandwich catalyst,i.e.,Fe atoms(polarized electric field layer)sandwiched between ultrathin(within electron tunneling distance)BN(catalyst layer)and graphene film(conducting layer),is fabricated for electrocatalytic NRR.The sandwich catalyst not only controls the transfer of electrons to the BN surface in the correct direction under applied voltage but also suppresses hydrogen evolution reaction by constructing a neutral polarization electric field without metal exposure.The sandwich electrocatalyst NRR system achieve NH3 yield of 8.9μg h^(−1)cm^(−2)and Faradaic Efficiency of 21.7%.The N_(2)adsorption,activation,and polarization electric field changes of three sandwich catalysts(BN-Fe-G,BN-Fe-BN,and G-Fe-G)during the electrocatalytic NRR are investigated by experiments and density functional theory simulations.Driven by applied voltage,the neutral polarized electric field induced by BN-Fe-G leads to the high activity of electrocatalytic NRR.

Regulation of interlayer channels of graphene oxide nanosheets in ultra-thin Pebax mixed-matrix membranes for CO_(2) capture

For the application of carbon capture by membrane process,it is crucial to develop a highly permeable CO_(2)-selective membrane.In this work,we reported an ultra-thin polyether-block-amide(Pebax)mixedmatrix membranes(MMMs)incorporated by graphene oxide(GO),in which the interlayer channels were regulated to optimize the CO_(2)/N_(2) separation performance.Various membrane preparation conditions were systematically investigated on the influence of the membrane structure and separation performance,including the lateral size of GO nanosheets,GO loading,thermal reduction temperature,and time.The results demonstrated that the precisely regulated interlayer channel of GO nanosheets can rapidly provide CO_(2)-selective transport channels due to the synergetic effects of size sieving and preferential adsorption.The GO/Pebax ultra-thin MMMs exhibited CO_(2)/N_(2) selectivity of 72 and CO_(2) permeance of 400 GPU(1 GPU=106 cm^(3)(STP)·cm^(2)·s^(-1)·cmHg^(-1)),providing a promising candidate for CO_(2) capture.

Asymmetric magnetoimpedance effect and dipolar interactions of FINEMET/SiO_(2)/FePd composite ribbons

The dipolar interactions are investigated through the asymmetric magneto-impedance in FINEMET/SiO_(2)/FePd composite ribbons.The interface between the hard(FePd layer)phase and soft(FINEMET ribbon)phase is coherent by SiO_(2)layer in FINEMET/SiO_(2)/FePd composite ribbons,which effectively induces dipolar interactions.The contribution of dipolar interaction to the bias field(Hb)by asymmetrical giant magneto-impedance and magnetic properties is analyzed.The results show that Hb response decreases with the increase of the SiO_(2)layer thickness,indicating that the linear region near-zero field can be tuned by the thickness of SiO_(2)layer.These results allow the GMI ratio(58%)and characteristic frequency(500 kHz)to be optimized.The transverse and longitudinal magnetic domain structures of FINEMET ribbon and FePd film are confirmed,respectively.The composite ribbons with high GMI ratio and low frequency can be applied to linear magnetic sensors.

Laparoscopic management of hydatid cysts using long ribbon gauze:An initial experience of 37 consecutive cases

Objective:The laparoscopic approach is becoming the standard of care for many surgical disorders.However,in the case of hydatid cysts,laparoscopic management is challenging due to the risk of spillage of hydatid fluid,which can cause an anaphylactic reaction and recurrence.Here,we report our initial experience with laparoscopic partial pericystectomy of hydatid cysts using long ribbon gauze to decrease intra-operative spillage.Method:This was a retrospective study(between January 2010 and December 2021)in the Department of Surgical Gastroenterology,Sanjay Gandhi Postgraduate Institute of Medical Science,a tertiary care referral center in northern India.Here,we have included 37 consecutive patients with hydatid cysts of the liver and spleen.Diagnosis was made by laboratory and imaging findings(abdominal sonography or contrast enhanced CT scans).All patients were managed with laparoscopic partial pericystectomy.Intraoperatively,a betadine-soaked long ribbon gauze,high-pressure suction canula,and an endo-bag were used in all patients.The collected data included patient demography,location,size,and number of cysts,WHO type,operative time,blood loss,postoperative complications,hospital stay and follow-up.Result:In our series,the mean age was 38.4±13.6 years,15(40.5%)were men and 22(59.5%)were women.The right lobe of the liver was the most commonly affected site(21,56.8%).The mean operative time was 80.0±32.0 min,and intraoperative blood loss was 23.6±11.5 mL.Bile leak was present in 6(16.2%)patients.There was no mortality.The hospital stay was 5(3,9)days,and no recurrence was observed at a median follow-up of 36 months.Conclusion:Laparoscopic partial pericystectomy using this technique is safe in the management of hydatid cysts.Simply,proper packing and safe removal of soaked gauzes can minimize the incidence of postoperative complications and recurrence.

蓝宝石光学曲面柱形宽缎带磁流变抛光仿真分析及实验研究

目的针对目前光滑无损伤光学曲面蓝宝石加工成本高、效率低的问题,对加工过程中磁流变抛光缎带进行流体仿真,进而优化抛光轮表面结构。方法设计并提出3种表面结构柱形宽缎带磁流变抛光轮,介绍了磁流变抛光轮加工的基本原理,建立了磁流变抛光垫Bingham流体特性加工仿真模型,分析了3种抛光轮表面结构对工件表面磁通密度模、流场流速、流场压力分布的影响。同时对3种抛光轮的抛光效果进行了实验探究,探究了抛光轮表面结构对材料去除率和抛光后表面粗糙度的影响规律。结果仿真结果表明,抛光轮表面槽型结构具有能增强磁通密度模、增大流体流速和流体压力的特性。实验结果表明,螺旋槽抛光轮的抛光效果最好,在螺旋抛光轮作用下,材料去除率为0.22mg/h,抛光后蓝宝石表面粗糙度为1.08nm。最终抛光轮近壁区总压力和速度的乘积结果与抛光轮实验去除率结果具有较好的一致性。结论槽型结构可以提高抛光液在抛光轮表面的固着效果,影响工件表面流场运动状态,增强工件表面受到抛光垫的作用力。相较于光滑和横条槽抛光轮,螺旋槽抛光轮的抛光效率最高,表面粗糙度最低,可有效提高抛光效果。

电解水析氢反应的铁基非晶合金薄带催化剂研究进展

Pt基电催化剂是析氢反应的基准,然而低丰度和高成本制约了此类贵金属基催化剂的大规模应用,从而促使了替代材料的探索。铁基非晶合金具有无序原子排布结构,表现出独特的物理化学性质。受碱性溶液中的高效析氢反应启发,简述了铁基非晶合金薄带电催化剂的常见反应机理和设计策略,旨在为制备高性能电催化剂提供指导,包括杂原子掺杂、异质面构筑、应变及空位缺陷构建等。此外,原位表征技术和密度泛函理论在铁基非晶合金薄带电催化剂理论设计、反应过程、动态结构演变和机理揭示等方面发挥了重要作用。最后简要介绍了铁基电催化剂目前存在的挑战和未来的研究方向。

基于高磷铁矿制备Fe-P合金催化剂用于高效全解水反应

本工作首次报道了一种高磷铁矿协同纯Ca_(3)(PO_(4))_(2)熔融还原并结合单辊旋淬技术制备Fe-P合金带材催化剂的短流程冶金工艺,该工艺具有成本低、产品附加值高、易于工业化的优点。针对电催化析氢合金催化剂低成本高效制备难题,国内外学者进行了重点研究。因此,通过短流程冶金的方法制备Fe-P合金带材催化剂并将其用于电催化制氢(HER)领域,一方面降低了冶金过程中二氧化碳和其他大气污染物的排放,另一方面为冶金资源实现“大型化、清洁化、连续化、自动化”再利用平台搭建提供了指导方案,有望解决催化剂技术在发展中存在的“卡脖子”问题。

一种改进的Ribbon Snake遥感图像道路自动生成算法

针对树木或高大建筑物遮挡以及噪声等因素造成道路提取结果不完整的现象,根据道路的几何特征,在Snake模型中加入道路宽度信息,构造Ribbon Snake模型。为了克服模型对内部参数依赖性较大、容易受到复杂背景干扰影响的不足,采用B样条曲线对道路的平滑性进行约束,与Ribbon Snake相结合建立道路提取算法,通过调节控制点的数目增强曲线的灵活性。从改进的B样条Ribbon Snake的道路网分割结果可以看出,分割的结果更加平滑,精度更高,对噪声具有更好的鲁棒性。

面向未来低碳道路养护的超薄罩面功能性研究综述

Highway maintenance mileage reached 5.25 million kilometers in China by 2021.Ultra-thin overlay is one of the most commonly used maintenance technologies,which can significantly enhance the economic and environmental benefits of pavements.To promote the low-carbon development of ultrathin overlays,this paper mainly studied the mechanism and influencing factors of several ultra-thin overlay functions.Firstly,the skid resistance,noise reduction,rutting resistance,and crack resistance of ultrathin overlays were evaluated.The results indicated that the high-quality aggregates improved the skid and rutting resistance of ultra-thin overlay by 5%-20%.The optimized gradations and modified binders reduced noise of ultra-thin overlay by 0.4-6.0 dB.The high viscosity modified binders improved the rutting resistance of ultra-thin overlay by about 10%-130%.Basalt fiber improved the cracking resistance of ultra-thin overlay by more than 20%.Due to the thinner thickness and better road performance,the performance-based engineering cost of ultra-thin overlay was reduced by about 30%-40%compared with conventional overlays.Secondly,several environmentally friendly functions of ultra-thin overlay were investigated,including snow melting and deicing,exhaust gas purification and pavement cooling.The lower thickness of ultra-thin overlay was conducive to the diffusion of chloride-based materials to the pavement surface.Therefore,the snow melting effect of self-ice-melting was better.In addition,the ultra-thin overlay mixture containing photocatalytic materials could decompose 20%-50%of the exhaust gas.The colored ultra-thin overlay was able to reduce the temperature of the pavement by up to 8.1℃.The temperature difference between the upper and lower surfaces of the ultra-thin overlay containing thermal resistance materials could reach up to 12.8℃.In addition,numerous typical global engineering applications of functional ultra-thin overlay were summarized.This review can help better understand the functionality of ultra-thin overlays and promote the realization of future multi-functional and low-carbon road maintenance.

铁基非晶条带催化降解性能的退火晶化调控机理

非晶合金是原子结构长程无序的亚稳态材料,具有优异的催化降解性能,同时也很容易发生晶化,但晶化对催化降解性能的影响机理目前尚不明确.本文研究了退火晶化对Fe-Si-B-Cu-Nb工业非晶条带微观结构及其对酸性橙7催化降解性能的影响.研究发现:经460—580℃退火后,条带的催化降解性能大幅下降,其反应速率常数低于0.01 min–1,α-Fe析出相导致其非晶结构的破坏,降低了羟基自由基的形成速率;而经过650—700℃退火后,条带的催化降解性能显著提高,反应速率可提升至退火前的3.77倍,降解15 min时的脱色率达99.22%,为退火前的1.12倍,催化降解性能的提高得益于晶化相与金属化合物间的原电池效应及富集Cu团簇和零价铁之间的置换反应.本研究揭示了退火晶化对偶氮染料的铁基非晶条带催化降解性能的作用机理,为利用老化的铁基非晶工业条带处理印染废水、实现“以废治废”,提供了有益的理论与实验支撑.

钙蛋白酶与内毛细胞带状突触噪声损伤的相关性研究

目的通过比较噪声暴露后基底膜不同区域内毛细胞(IHCs)带状突触损伤差异,探讨带状突触损伤易感性的相关因素。方法将28只C57BL/6J雄性小鼠随机分为噪声暴露组和对照组,每组14只。噪声暴露组小鼠给予强度103 dB SPL、频率2~20 kHz、持续2 h的宽带噪声暴露,对照组小鼠则饲养于安静环境中。噪声暴露前及噪声暴露后第一天进行ABR测试及毛细胞带状突触免疫荧光染色实验。使用全细胞膜片钳技术比较不同区域IHCs的钙离子流入。通过免疫荧光染色比较噪声暴露后的耳蜗基底膜顶回、中回、底回IHCs钙蛋白酶(Calpain)表达水平,并用蛋白质印迹实验验证钙蛋白酶对IHCs带状突触蛋白CtBP2的损伤作用。结果噪声暴露后一天,噪声暴露组在11.3、16.0、22.6、32.0 kHz的ABR阈值较对照组显著上升(均为P<0.001),中回、底回IHCs带状突触数量明显减少(P<0.05)。全细胞膜片钳实验结果表明耳蜗基底膜中回IHCs有较多的钙离子通道(P<0.01),但其单通道电流较小(P<0.01),顶回、中回IHCs钙离子通道开放率无显著差异(P>0.05)。噪声暴露后,耳蜗基底膜中回、底回IHCs的Calpain表达水平显著高于顶回(P<0.001),蛋白质印迹实验结果表明Calpain以钙离子依赖的方式降解带状突触蛋白CtBP2。结论钙蛋白酶是基底膜高频区内毛细胞带状突触噪声损伤易感的重要因素。

柔性飘带长度对Ahmed模型气动阻力的影响

为降低汽车行驶过程中的气动阻力,以尾部倾角为25°的Ahmed类车体模型为研究对象,提出在其尾部垂直面下边缘添加不同长度柔性飘带的控制方法,采用格子玻尔兹曼方法与有限元分析相结合的流固耦合计算方法,探讨了柔性飘带长度对汽车气动阻力的影响。首先对汽车模型进行格子尺度优化,得到模型的空气阻力系数;然后研究了柔性飘带对汽车气动阻力的影响;最后对模型尾部流场、柔性飘带附近流场以及模型尾部表面压力系数进行了分析。仿真结果表明:在模型尾部添加适当长度的柔性飘带,改善了尾流结构,提升了尾部表面压力,减小了车体的压差阻力,减阻率最高为12.25%。

宋代官服中绶带纹样探析

宋代受到传统儒家思想的影响、程朱理学思想的制约,宋代等级制度更为森严,因此宋代官服品类繁多、等级鲜明。本文以宋代官员所佩绶带为研究对象,梳理并归纳了宋代不同时期“锦绶”的使用制度,分析纹样特点,深入探究其由表象到内隐所传递的文化内涵。研究表明:该绶带是显现权责之饰物,以外显、内隐的方式体现了朝政官员对等级秩序的认同、对吉祥蕴意的渴望及对官位荣誉的追求。本文研究成果有助于完善宋代等级秩序信息的承传,还原宋代官场生活、审美等方面的本来面貌,以期对绶带纹样有更为深入的了解和认识。

凝固浴牵伸对微纳层叠带状PAN原丝性能的影响

采用新型微纳层叠挤出技术制备了层叠带状聚丙烯腈(PAN)碳纤维原丝,利用扫描电子显微镜、X射线衍射仪、万能材料试验机和差示扫描量热仪对原丝的性能进行表征,研究了不同凝固浴牵伸倍数对微纳层叠带状PAN原丝截面形态、结晶性能、力学性能以及热行为的影响。研究结果表明,随着凝固浴牵伸倍数的提高,层叠带状PAN原丝的厚度显著减小,线密度显著降低;层叠带状PAN原丝的结晶度和拉伸强度随着牵伸倍数的提高呈现先增加后减小的趋势,凝固浴牵伸倍数为5.5倍时,获得的层叠带状PAN原丝的性能较好。当凝固浴牵伸倍数从5.5倍增加至6.5倍时,原丝的拉伸强度由26.08 MPa降低至23.36 MPa。实验结果表明,凝固浴牵伸倍数为5.5倍下制备的层叠带状PAN原丝具有较好的综合性能,其结晶度为39.1%,拉伸强度和拉伸模量分别为26.08及661 MPa。

衰老耳蜗带状突触中的蛋白质稳态

作为听觉信息转换和传导的关键性传入结构,耳蜗带状突触有着特殊的分子表达,也是耳蜗衰老损伤的早发点。既往研究揭示了蛋白质稳态失衡是衰老改变的重要一环,其在耳蜗衰老中也有突出表现。我们回顾并讨论蛋白质稳态维持的两种主要降解机制,即泛素-蛋白酶系统(ubiquitin-proteasome system,UPS)及自噬-溶酶体途径(autophagy-lysosome pathway,ALP)。UPS和ALP是清除错误折叠或未折叠蛋白的关键机制,蛋白质降解机制失调的研究揭示了蛋白质稳态在耳蜗带状突触年龄损伤中的影响。蛋白质平衡的调控可能为年龄相关性听力损伤治疗提供多方面的潜在可能。

微纳层叠带状聚丙烯腈初生纤维的制备及性能研究

以聚丙烯腈(PAN)和二甲基亚砜(DMSO)为原料,采用新型微纳层叠挤出技术制备了微纳层叠带状聚丙烯腈(PAN)基初生纤维,利用扫描电子显微镜、X射线衍射仪、电子万能试验机对初生纤维的性能进行了研究。分析了纤维凝固成形过程中空气层高度、凝固浴温度、凝固浴浓度对微纳层叠带状PAN初生纤维性能的影响。结果表明:层叠带状PAN初生纤维相比于传统圆形截面纤维,在纺丝过程中能保持良好的带状截面不变形;并且在空气层高度为30mm,凝固浴温度为45℃,凝固浴浓度为40%工艺条件下制备的层叠带状PAN初生纤维综合性能较好,获得了结晶度为31.3%,晶粒尺寸为4.53nm,拉伸强度为14.60MPa的层叠带状PAN初生纤维。

热转印系统色带传动过程张力分析与建模

为保证热转印过程中薄膜色带传动稳定进而实现高质量转印,建立正确的热转印色带传动张力模型十分关键。首先,研究了热转印色带传动系统组成及转印原理,并根据色带传动路径分辊间段、放卷段和收卷段3阶段对色带传动系统张力进行了建模与分析。然后,结合热转印色带卷材的黏弹性分析张力形成机制,改进了卷绕系统经典张力公式,建立了辊间段薄膜色带张力模型。针对传动系统的放卷区域,分析了摩擦对薄膜色带传动张力的影响,提出张力下降系数以评估张力损失。考虑色带张力非线性时变的特点,利用步进电动机负载模型求解收卷区域色带张力。最后,通过对比仿真与实验所得的色带张力变化曲线,验证了模型的准确性,为后续张力控制方案设计奠定了基础。