Robust optical mode converter based on topological waveguide arrays

Optical mode converters are essential for enhancing the capacity of optical communication systems. However, fabrication errors restrict the further improvement of conventional mode converters. To address this challenge, we have designed an on-chip TE0–TE1mode converter based on topologically protected waveguide arrays. The simulation results demonstrate that the converter exhibits a mode coupling efficiency of 93.5% near 1550 nm and can tolerate a relative fabrication error of 30%. Our design approach can be extended to enhance the robustness for other integrated photonic devices, beneficial for future development of optical network systems.

Design of integral sliding mode guidance law based on disturbance observer

With the increasing precision of guidance,the impact of autopilot dynamic characteristics and target maneuvering abilities on precision guidance is becoming more and more significant.In order to reduce or even eliminate the autopilot dynamic operation and the target maneuvering influence,this paper suggests a guidance system model involving a novel integral sliding mode guidance law(ISMGL).The method utilizes the dynamic characteristics and the impact angle,combined with a sliding mode surface scheme that includes the desired line-ofsight angle,line-of-sight angular rate,and second-order differential of the angular line-of-sight.At the same time,the evaluation scenario considere the target maneuvering in the system as the external disturbance,and the non-homogeneous disturbance observer estimate the target maneuvering as a compensation of the guidance command.The proposed system’s stability is proven based on the Lyapunov stability criterion.The simulations reveale that ISMGL effectively intercepted large maneuvering targets and present a smaller miss-distance compared with traditional linear sliding mode guidance laws and trajectory shaping guidance laws.Furthermore,ISMGL has a more accurate impact angle and fast convergence speed.

Trajectory tracking guidance of interceptor via prescribed performance integral sliding mode with neural network disturbance observer

This paper investigates interception missiles’trajectory tracking guidance problem under wind field and external disturbances in the boost phase.Indeed,the velocity control in such trajectory tracking guidance systems of missiles is challenging.As our contribution,the velocity control channel is designed to deal with the intractable velocity problem and improve tracking accuracy.The global prescribed performance function,which guarantees the tracking error within the set range and the global convergence of the tracking guidance system,is first proposed based on the traditional PPF.Then,a tracking guidance strategy is derived using the integral sliding mode control techniques to make the sliding manifold and tracking errors converge to zero and avoid singularities.Meanwhile,an improved switching control law is introduced into the designed tracking guidance algorithm to deal with the chattering problem.A back propagation neural network(BPNN)extended state observer(BPNNESO)is employed in the inner loop to identify disturbances.The obtained results indicate that the proposed tracking guidance approach achieves the trajectory tracking guidance objective without and with disturbances and outperforms the existing tracking guidance schemes with the lowest tracking errors,convergence times,and overshoots.

English-Chinese Translation of Science and Technology Texts Based on the Differences Between Chinese and Western Modes of Thinking

As a tool for human communication,the use of language is affected by the way of thinking in cross-cultural communication.Due to the differences between Chinese and Western cultures,the way of thinking varies under the influence of such cultural differences.In the process of translation,the influence of the different thinking mode on translation activities cannot be ignored.At present,a lot of studies and researches have focused on the influence of Chinese and Western thinking mode on translation.However,it is still worthwhile to study what specific influence the difference between Chinese and Western thinking mode will exert on the translation process of science texts and what kind of measure should be taken to solve the negative influence brought by the differences when we are translating.This paper aims to discuss the influence of thinking differences between Chinese and Western countries on the process of English-Chinese translation of science and technology from the perspectives of long sentences,passive voice and nominalization,and how the translators should appropriately adjust their thinking pattern and use reasonable skills to eliminate the potential negative interference caused by the difference and achieve a better transformation between English and Chinese.

Boundary Element Analysis forModeⅢCrack Problems of Thin-Walled Structures from Micro-to Nano-Scales

This paper develops a new numerical framework for modeⅢcrack problems of thin-walled structures by integrating multiple advanced techniques in the boundary element literature.The details of special crack-tip elements for displacement and stress are derived.An exponential transformation technique is introduced to accurately calculate the nearly singular integral,which is the key task of the boundary element simulation of thin-walled structures.Three numerical experiments with different types of cracks are provided to verify the performance of the present numerical framework.Numerical results demonstrate that the present scheme is valid for modeⅢcrack problems of thin-walled structures with the thickness-to-length ratio in the microscale,even nanoscale,regime.

Integrated of Proximity-Coupling High-Order Modes Patch Antenna with Solar Cells for Sustainable Communication

An integration of single-layer proximitycoupling patch antenna and solar cells with bandwidth enhancement and optical energy harvesting is proposed for sustainable communication.For this purpose,many dual-function components are selected for designing the miniaturized solar cell antenna.On the one hand,by greatly affecting the current flow of the rectangular patch,vias and proximity-coupling are introduced to control the resonance modes frequency and matching,respectively,for wideband application,and the radiation performance property can be achieved by high-order mode.On the other hand,vias and proximity-coupling are beneficial to complete direct-current(DC)loop of solar cell and improve compatibility of DC-RF(radio frequency),whereas a high-order mode is beneficial to increase the area of collected light energy.To prove the working principle,fabricated and manufactured solar cell antenna.The measured and simulated results illustrate that the solar cell antenna gain is raised to as high as 9.27 d Bi in4.37 to 5.06 GHz applied to fifth generation communication(5G).

An ISGW Filtering Antenna with Spurious Modes and Surface Wave Suppression for Millimeter Wave Communications

In this paper,an integrated substrate gap waveguide(ISGW)filtering antenna is proposed at millimeter wave band,whose surface wave and spurious modes are simultaneously suppressed.A secondorder filtering response is obtained through a coupling feeding scheme using one uniform impedance resonator(UIR)and two stepped-impedance resonators(SIRs).To increase the stopband width of the antenna,the spurious modes are suppressed by selecting the appropriate sizes of the ISGW unit cell.Furthermore,the ISGW is implemented to improve the radiation performance of the antenna by alleviating the propagation of surface wave.And an equivalent circuit is investigated to reveal the working principle of ISGW.To demonstrate this methodology,an ISGW filtering antenna operating at a center frequency of 25 GHz is designed,fabricated,and measured.The results show that the antenna achieves a stopband width of 1.6f0(center frequency),an out-of-band suppression level of 21 dB,and a peak realized gain of 8.5 dBi.

城乡融合型乡村振兴的实践探索、认识思考与对策建议

推进不同类型乡村振兴是全面落实乡村振兴战略和实现中国式农业现代化的重要途径。在城郊融合类村庄的基础上延伸出的“城乡融合型乡村”,具有独特的内涵、特征和功能价值。作为城乡融合型乡村的典型案例,成都市新津区在城乡要素互通、产业融合、空间重塑、农博引领、共建共治、数字赋能等方面积极探索,城乡融合引领乡村振兴取得显著成效。在此基础上必须进一步深化对城乡融合型乡村振兴的认识并进行理论概括,在实践中应注意政府的参与要适时适度,提高乡村居民的参与度,激发乡村人才和集体经济组织的内生动力,激活资源要素和破解金融困境,着力提高人口双向流动程度等。

工程教育专业认证下实践教学体系与模式探索

针对社会对卓越工程师需求的现状,实践教学改革应该促进学生工程意识、工程能力和工程素养的提升,以满足社会发展对工程技术人才的需求。通过对应用型高校电子信息科学与技术专业实践教学体系和模式研究探索,对实践教学目标体系、内容体系和评价体系进行架构,实施“课堂+实践+社会+网络”的“四维一体”的立体化实践教学模式。依据工程教育专业认证标准,提出实践教学改革“知行合一、工学结合,全方位、全覆盖、全过程”的理念和“一个定位、两个转变、三个层次、四个维度、五个结合、六个目标”的教学改革思路,为一流专业建设和工程认证背景下的课程建设提供参考和应用实践。

产教融合视域下岗课赛证融通育人模式

产教融合是高职教育发展的重要举措和主要途径。产教融合要求高职院校的教学链、人才链与产业链在规模和结构上相互协调,人才培养模式与地方产业活动相互衔接,学校的人才培养方案、课程体系设置和各种资源配置与对应的岗位相互契合。高职院校可以通过教师、教材和教法“三教”改革推动“岗课赛证”融通。调研岗位职责以岗定课、重构课程体系以课育人、参与技能大赛以赛导课和获取资格证书以证验课,进一步深化产教融合、强化专业知识、优化信息能力、提升岗位技能和综合素养。

基于积分滑模的电子机械制动系统ABS控制

为解决传统制动系统逻辑门限控制存在逻辑复杂且难以充分利用路面附着的问题,以及ABS存在的非线性、不确定性问题,提出了一种基于路面识别的ABS控制策略应用在电子机械制动系统。首先,通过Simulink建立1/4车辆制动模型;其次,分析附着系数在不同路面存在的差异性以及附着系数和车轮角减速度的变化规律,设计了一种高效且准确的路面识别算法来估算当前路面的最佳滑移率;最后,设计了基于积分滑模控制的ABS控制策略跟踪最佳滑移率。仿真结果表明:路面识别算法识别响应快、识别准确度高;所设计的ABS控制策略能够稳定跟踪最佳滑移率,对不同路面工况具有较强的适应性。与基于逻辑门限控制的传统制动系统相比,在单路面条件下制动时间减少了11.89%,制动距离缩短了12.7%;在变路面条件下制动时间减少了17.8%,制动距离缩短了19.9%。

基于计算思维的高中信息技术项目教学模式研究

计算思维作为《普通高中信息技术课程标准(2017年版2020年修订)》提出的四大核心素养之中枢,在当今已被提升到全民素养的高度。项目教学是“新课标”倡导的学习方式,开展基于计算思维的项目教学模式实践,对提升学生信息素养和实现学科价值有着重要意义。研究认为,基于计算思维的项目教学模式需以横向“项目主线”为教学流程,运用计算思维基本方法,在纵向“教学主线”下开展实践,包括确定项目需求,发现生活中的实际问题;抽象分解建模,界定问题生成活动任务;分组协作探究,寻找并实施自动化方案;总结反思评价,实现求解方案拓展迁移等环节。

地理野外实践思政元素挖掘与思维模式培养

课程思政是一种教学理念,立德树人是教育的根本任务,实践育人是立德树人的重要环节和途径。为切实发挥实践课程立德树人的育人功能,打造立德树人课程体系,该文以武汉大学地理科学基地班在湖北的地理野外实践为例,在思政元素挖掘及专业融合、科学思维模式构建、提升教师育人功能三个方面进行探索,构建一套具备立德树人价值的课程模式。通过自然地理类、人文地理类及交叉类思政元素挖掘及专业融合,综合性思维、区域性思维、生态思维以及辩证思维能力思维模式的构建,并通过提升教师的育人功能,潜移默化地提升学生的综合素质,实现立德树人教育。

应用型专业实践教学产教融合模式探索与实践——以木材科学与工程专业为例

在新工科和工业4.0背景下,传统实践教学理念、体系和“双师型”教师的欠缺,造成了地方本科高校应用型技术人才的培养与产业需求严重脱节的现状。而产教融合是解决该问题的有效方法。因此,以木材科学与工程专业应用型人才培养为例,阐述了产教融合的重要性,分析了实践教学的现状,从实践教学理念的更新、教学体系的重构和“双师型”师资的培养等三方面,进行了产教融合视域下实践教学培养模式的探索和初步实践。

产教融合背景下新能源汽车专业应用型人才培养模式探索与实践

随着汽车“新四化”的技术变革,对新能源汽车工程技术人才培养提出了新的要求。针对当前高校新能源汽车人才培养过程中存在的主要问题,本文以南航金城学院新能源汽车专业为例,从校企协同育人生态体系构建、人才培养方案修订、校企共建课程体系、教学模式改革、双师型师资队伍建设、教学实践基地共建等方面提出了应用型高校深度产教融合的新能源汽车人才培养举措。以期为相关院校在新能源汽车人才培养过程中提供借鉴,培养出产教高度契合的满足现代产业需求的高素质应用型创新人才。

生成式人工智能赋能跨学科创新思维培养:内在机理与模式构建

在学科融合趋势日益迅猛的时代背景下,培养学生的跨学科创新思维是当前教育的重要目标之一。作为人工智能时代的突破性技术,生成式人工智能给技术赋能教育带来了巨大的机遇与挑战。基于此,文章聚焦跨学科教育领域,首先阐释了跨学科创新思维的基本内涵和分类,在此基础上归纳出跨学科创新思维的四个发生要素:多学科知识基础、基本的创新思维、团队沟通与协作、产出导向。然后,文章剖析了生成式人工智能赋能跨学科创新思维培养的四个核心功能:高效信息检索与整合、多轮对话与角色模拟、评价与反馈、生成与创作。在此基础上,文章厘清了生成式人工智能赋能跨学科创新思维培养的内在机理。最后,文章从“课前-课中-课后”教学评一体化的视角,基于面向设计的产生式学习模式(Design-oriented Production-Based Learning,DoPBL),构建了生成式人工智能赋能跨学科创新思维培养的教学模式。文章通过研究,旨在为人工智能时代下如何培养学生的跨学科创新思维提供理论和实践参考。

产教融合视域下涉外旅游人才培养路径的创新与实践——以浙江国际海运职业技术学院为例

旅游产业的国际化发展对涉外旅游人才培养提出新要求。在分析浙江国际海运职业技术学院涉外旅游人才培养现状的基础上,通过构建产教融合新生态、校企共促教育供给侧改革探索人才培养新路径,提出持续打造互利共赢的产教融合生态圈等深化涉外旅游人才培养的建议,为当地行业企业培养更适配的涉外旅游人才,推进旅游类专业的产教融合。

高校智库服务决策的模式构建与高质量发展——基于知识生产模式转型的视角

高校智库服务决策本质上是一种知识生产活动。知识生产模式转型背景下,高校智库服务决策的内涵更加丰富,目标情境、参与主体、研究范式、评价方式等不断变化,展现出诸多新特征。本研究通过对高校智库服务决策特征变化的分析,构建了高校智库服务决策的三种模式:学科中心学术情境下“学—政”互动的专家模式、跨学科应用情境下“智—政”互动的平台模式和超学科适应情境下多边互动的开放模式。在这三种模式演进和共生发展情境下,提出高校智库服务决策实现高质量发展的四条进路:树立符合国家需求与公共利益的服务决策理念,创新多边互动的服务决策组织形式,构建多层次的服务决策研究范式,建立开放多元的服务决策评价体系。

水分优化管理对稻虾共作模式水稻产量及土壤还原性物质的影响

通过探索水分优化管理对稻虾共作模式水稻产量及土壤还原性物质的影响,为该模式下水稻水分管理和土壤改良提供科学依据。在水稻直播和机插两种种植方式下,分别设置以水稻分蘖后期和成熟期两次重晒田等措施为主的水分优化管理处理、以水稻分蘖后期和成熟期两次轻晒田等措施为主的水分常规管理处理,于湖北省潜江市采用田间定位试验开展研究。结果表明,在水稻直播和机插条件下,水分优化管理相对于常规管理平均增产率分别为8.5%和9.4%,增产效果均达到显著水平。相对于常规管理,水分优化管理对水稻有效穗数和每穗粒数的正效应大于结实率和千粒质量。水稻分蘖后期,水分优化管理相对于常规管理0~10 cm土层亚铁含量下降40.8%~41.8%,0~20 cm土层还原性物质总量下降45.1%~46.4%;与分蘖后期相比,水稻收获后0~20 cm土层亚铁和还原性物质总量总体呈下降趋势。由此表明,稻虾共作模式下分蘖后期和成熟期两次重晒田等水分优化管理措施能够显著增加水稻产量,缓解土壤潜育化程度。

文旅融合背景下地方高校旅游管理专业发展定位冷思考

文化与旅游融合发展,是文化和旅游回归本质的应有之意。文旅融合时代背景,对旅游人才培养是机遇也是挑战。专业人才是文旅融合高质量发展的关键。而旅游专业人才供需结构性矛盾产生的原因复杂多样,与行业产业的特点、学科设置状况、专业建设和人才成长自有规律等有关。地方高校旅游管理专业是旅游人才培养体系的重要一环。面对文旅融合的需要及各种困局,应理性思考破冰之策。论文提出,地方高校应精准锚定发展定位,遵循教育发展和人才成长规律,守住专业阵地,有所为、有所不为,立德树人,提高学生专业所长,培养学生团队合作精神。