摘要：A Stirling-type pulse tube cryocooler （PTC） with precooling was designed and manufactured to investigate its performance at 4 K. Numerical simulation was carried out based on the well-known regenerator model REGEN with an emphasis on the performance of a 4 K stage regenerator of the Stifling-type PTC as influenced by the warm end temperature, pressure ratio, frequency and average pressure with helium-4 and helium-3 as the working fluid respectively. This study demonstrates that the use of a cold inertance tube can significantly improve the efficiency of a 4 K Stirling-type PTC. A preliminary experimental investigation was carried out with helium-4 as the working fluid and a refrigeration temperature of 4.23 K was achieved. The experimental results show that the operating frequency has a significant influence on the performance of the Stirling-type PTC and a relatively low average pressure is favorable for decreasing the loss associated with the real gas effects of a 4 K Stirling-type PTC.

摘要：高满堂的影视剧创作为中国当代主旋律电影增加了亮色和底气。高满堂自觉以民族的传统精神与价值为艺术的价值追求,这种自觉使高满堂的创作,不仅有对当下文化的思考与担当,还有对中国传统艺术理想的继承与沉淀,这种沉淀使他的创作蕴蓄着深厚的中国传统艺术的境界和魅力,也使之成为当代电视剧创作的精神航标。无论是《闯关东》《老中医》还是《老酒馆》,都贯穿了高满堂的艺术创作追求和审美理想,它们共同呈现出不同凡响的艺术之高远“气象”、深厚“韵味”以及凛然“风骨”。

摘要：利用经典的PID控制器针对1/4悬架进行主动悬架的设计。考虑到悬架多个性能指标的协调,本文利用遗传算法进行多个目标的优化及参数整定。经过优化,悬架的各个性能指标都有非常明显的降低,舒适性、安全性以及操纵稳定性都得到了非常明显的改善。

摘要：“刀味”与“木味”是木刻版画特有的形式语言,具有丰富的表现力和独到的艺术韵味,运用这一独有的表现语言进行画面创作的趣味性表达,构建出一个“筑梦世界”,并由此感受不同刻刀和刀法刻制在板材上所传递出的个人情感,探索黑白木刻创作中的“刀木趣味”。

摘要：介绍了VI-DE,数据抽取工具DE-Wrapper的可视化编辑调试环境。DE-Wrapper使用扩展正则表达式(ERE)描述数据源结构,根据该ERE构造数据抽取树(DE-树),然后根据DE-树生成相应的关系数据库模式,最后抽取数据。VI-DE整合了DE-Wrapper的工作流程。该工具首先使用可视化界面支持ERE/DE-树可视化构建,然后自动检查该ERE/DE-树是否具有二义性,最后在样本数据上运行抽取算法并给出数据库结构和抽取结果,供用户进行评价,从而逐步引导用户设计出满足要求的ERE/DE-树。VI-DE已用于构建国内第1个整合的生物信息在线数据仓库系统。

摘要：Ski tourism is extremely sensitive to climate change and is also heavily affected by socioeconomic *** some ski areas arestill profitable under current climate and socioeconomic conditions,they will become difficult to operate in the face of rising winter temper-atures,which will result in further economic losses,resource waste and environmental *** study projects variability in the suitability ofski area development across China in the coming *** suitability under three representative concentration pathway emission sce-narios(RCP2.6,RCP4.5 and RCP8.5),socioeconomic suitability under four shared socioeconomic pathways(SSP1,SSP2,SSP3,and SSP5)andintegrated suitability under four climatic-socioeconomic scenarios(RCP2.6-SSP1,RCP4.5-SSP2,RCP8.5-SSP3,and RCP8.5-SSP5)are ***,the suitability of 731 existing ski areas in China is *** results show a substantial decline in integrated suitabilityfor most regions of China except for some very cold areas,where higher air temperatures will make visitors feel more comfortable and therelatively poor socioeconomic conditions will improve in the 2030s,2050s and *** average higher integrated suitability area(integratedsuitability values greater than 0.5)under four climatic-socioeconomic scenarios decreases from the current 29.9%e14.4%,5.0%and 4.5%bythe 2030s,2050s and 2090s,*** RCP2.6-SSP1,the higher integrated suitability area is projected to decrease from the current28.0%e5.2%by the 2050s and then increase to 5.3%by the *** RCP4.5-SSP2,RCP8.5-SSP3,and RCP8.5-SSP5,the higher inte-grated suitability area is projected to continuously decrease from 30.3%,30.6%and 30.6%in the 2010s to 4.1%,4.4%and 4.4%in the 2090s,*** the 2090s,41,138 and 277 existing ski areas are projected to be closed under RCP2.6-SSP1,RCP4.5-SSP2,and RCP8.5-SSP3/RCP8.5-SSP5,*** is clear that emission pathways and climate change adaptation and mitigation

摘要：互联网的发展和数据驱动时代的到来使社会网络分析法能够为以图书馆为主阵地的阅读推广服务提供助力。图书馆在制订阅读推广活动策略时应弱化地域特征、科学划分目标群体并预见推广过程中的阻力因素,在此基础上综合考量自身优势、主体间合作、目标群体特征、服务方式、宣传推广、用户反馈、服务的可持续发展等因素,构建基于自身优势的阅读推广服务的良性循环。

摘要：目前悬挑式钢平台因吊环断裂导致坠落的事故时有发生。吊环断裂的原因包括设计不合理、钢材疲劳、预留孔位置不正确等。提出优选材质、改进吊环制作安装等针对性措施。

摘要：结合企业专用铁路车站的特点以及与国铁编组站的不同点,从CIPS系统设计及实施角度描述该系统在企业专用铁路车站实施的可行性,并举例说明CIPS不仅可以应用于国铁编组站,也可以很好的应用于企业专用铁路车站。

摘要：Strontium-90,a highly radioactive isotope,accumulates within the food chain and skeletal structure,posing significant risks to human *** is a critical need for a sensitive detection strategy for Strontium-90 in complex environmental ***,solid-state nanochannels,modified with metal-organic frameworks(MOF)and specific aptamers,were engineered for highly sensitive detection of strontium ion(Sr^(2+)).The synergistic effect between the reduced effective diameter of the nanochannels due to MOF and the specific binding of Sr^(2+) by aptamers amplifies the difference in ionic current signals,enhancing detection sensitivity *** MOF-modified nanochannels exhibit highly sensitive detection of Sr^(2+),with a limit of detection(LOD)being 0.03 nmol·L^(-1),whereas the LOD for anodized aluminum oxide(AAO)without the modified MOF nanosheets is only 1000 nmol·L^(-1).These findings indicate that the LOD of Sr^(2+) detected by the MOF-modified nanochannels is approximately 33,000 times higher than that by the nanochannels without MOF ***,the highly reliable detection of Sr^(2+) in various water samples was achieved,with a recovery rate ranging from 94.00%to 118.70%.This study provides valuable insights into the rapidly advancing field of advanced nanochannel-based sensors and their diverse applications for analyzing complex samples,including environmental contaminant detection,food analysis,medical diagnostics,and more.