摘要：恒压变量泵在各行各业有着广泛的应用,该文主要对恒压变量泵控制阀进行分析,对恒压变量泵控制阀建立数学模型,根据阀芯动态特性,分析各个参数对其动态特性的影响。并根据结果对其结构参数进行优化,为恒压控制阀设计合理的设计参数。

摘要：针对大型监控系统中实现多路视频数据合成单路的传输问题,提出了一种基于FPGA的多路视频合成及传输的设计方案。根据以太网协议,将不同视频流作相应的封装,缓存在各路对应的包FIFO中,通过采用轮询机制读取包FIFO中的视频数据帧,暂存在总的包FIFO中,并通过千兆以太网发送,实现多路视频数据流合成单路传输。实验结果表明,该设计方案可实现视频数据快速准确的传输,极大地提高了传输效率和可靠性。

摘要：Micron/nano scale topographic modification has been a significant focus of interest in current titanium(Ti)surface ***,the influence of micron/nano structured surface on cell or bacterium behavior on the Ti implant has rarely been systematically ***,except for popular microgrooves,little work has been carried out on the reaction of cells to the bionic *** this study,several micro-pillars mimicking cell morphology were prepared on Ti surfaces by lithography and contact printing(ICP)method,and they were further decorated with nanotube arrays by anodization *** surface modifications remarkablly increased the surface roughness of pristine Ti surface from 91.17 nm±5.57 nm to be more than 1000 nm,and reduced their water contact angles from 68.3°±0.7°to be 16.9°±2.4°.Then,the effects of these hierarchical micron/nano scale patterns on the behaviors of MG63 osteoblasts,L929 fibroblasts,SCC epithelial cells and *** were studied,aiming to evaluate their performance in osseointegration,gingival epithelial sealing and antibacterial *** an innovative scoring strategy,our findings showed that square micro-pillars with 6μm width and 2μm height combined with 85 nm diameter nanotubes was suitable for implant neck design,while square micro-pillars with 3μm width and 3.6μm height combined with 55 nm diameter nanotubes was the best for implant body *** study reveals the synergistic effect of the hierarchical micron/nano scale patterns on MG63 osteoblasts,L929 fibroblasts,SCC epithelial cells and *** *** provides insight into the design of biomedical implant surfaces.

摘要：In this study,2D and 3D soil arching phenomena associated with piled embankments were evaluated by performing a series of discrete numerical analyses using the particle flow code(PFC3D)*** validating the micro-parameters with experimental results,we compared the stress-displacement distribution,force chain evolution,maximum vertical displacement of particles,and deformation characteristics induced by 2D and 3D arching *** analyses were carried out to understand the influence of the fill height,pile clear spacing,friction coefficient,and porosity on soil arching with respect to the stress concentration ratio(SCR)and settlement along the elevation at various *** numerical results indicated that a plane soil arch in a 2D embankment overestimates the degree of load transfer and underestimates the settlement at the crest and within the embankment along the elevation in a 3D embankment.A lower equal settlement plane can be found in a 2D ***,an increase of fill height and friction angle,and a decrease of pile clear spacing and porosity can help to improve the degree of reduction in load transfer and settlement in both 2D and 3D ***,for partially mobilized soil arching in the 3D condition,the increase of fill height reduces the settlement of soils mainly in the portion above the square subsoil area,but has less influence over the portion above the rectangular subsoil area.

摘要：Porous g-C_(3)N_(4)nanosheets(PCN)were prepared by the nickel-assisted one-step thermal polymerization ***(H2)which was produced by the reaction between nickel(Ni)foam and ammonia(NH3)defined the structure and properties of *** the formation of PCN,the participation of H2 not only enhanced the spacing between layers but also boosted the specific surface area that more active sites were ***,H2 promoted pores formation in the nanosheets,which was beneficial to the transfer of photons through lamellar structure and improved the absorption efficiency of visible ***,the obtained PCN possessed better Cr(Ⅵ)photocatalytic reduction efficiency than pure g-C_(3)N_(4).The reaction rate constant(k)of PCN(0.013 min-1)was approximately twice that of bare g-C_(3)N_(4)(0.007 min-1).Furthermore,the effects of original pH and concentration of Cr(Ⅵ)-containing solution on re moval efficiency of Cr(Ⅵ)were explored.A possible photocatalytic mecha nism was proposed based on the experiments of radical scavengers and photoelectrochemical characterizations.

摘要：水泥行业碳排放量居工业行业第二位,占整个工业排放量的20%左右,面临着二氧化碳减排的巨大压力,而目前水泥行业还没有真正意义上的碳排放在线监测系统。文中通过开展水泥行业碳排放在线监测系统的研究,搭建在线监测系统总体框架,设计满足企业、碳排放主管部门需求的系统功能,实现水泥企业碳排放数据的实时监测,自动核算报告。通过试点企业在线监测数据分析比较,说明在线监测系统能够满足企业碳排放数据“可监测、可报告、可核查”的要求。

摘要：难消化糊精是一类富含α-1,2、α-1,3、α-1,6糖苷键或环状糖链结构的可溶性糊精的总称,具有升糖指数低及促进肠道益生菌增殖的特点。难消化糊精的目前商业化主流制备工艺为酸热法,酶法制备相关研究仍然较少。难消化糊精制备的关键是增加难消化的α-1,2、α-1,3、α-1,6糖苷键含量或增加产物聚合度。对构巢曲霉(Aspergillus nidulans)来源的α-葡萄糖苷酶AgdB进行改造,以增加其产物α-1,3键型或提高其产物聚合度。通过理性设计,经定点突变后获得N466D、R450H、A445S、Y202A共4个突变体。以麦芽糖为底物反应时,突变体N466D、R450H产物α-1,3糖苷键含量增加,突变体R450H、A445S、Y202A生成更高聚合度的产物。随后将突变体与野生型分别与环糊精葡萄糖基转移酶进行复配,结果表明,突变体R450H、A445S、Y202A均能有效提高产物慢消化成分,突变体N466D虽然提高了α-1,3键含量,但同时提高了α-1,4键含量,因此产物慢消化成分反而有所降低。该研究为改造α-葡萄糖苷酶,提高难消化糊精的慢消化及抗消化组分提供了新的思路。

摘要：为了从红外光谱图像中获取有用信息,设计基于改进迁移学习的红外光谱图像自适应分割方法。采集系统获取红外光谱图像,采用直方图均衡技术对红外光谱图像进行增强处理,依据增强后图像各帧像素的高斯正态分布,重建红外光谱图像,将红外光谱图像重建结果输入双分支卷积神经网络模型,利用迁移学习子网提取红外光谱图像全局特征,结合残差注意力子网提取的图像细小特征;通过集成学习融合差异红外光谱图像特征,输出分割后的红外光谱图像。测试结果表明:该方法可实现红外光谱图像分割,且分割结果清晰,具有显著细节特征。

摘要：【背景】人类利用能源的趋势是从高碳高污染非可再生能源向低碳清洁可再生能源转化,在这个过程中,以天然气、风电、太阳能、氢能为代表的低碳清洁能源需要耦合深部地下储存空间来抵消其地域性和不稳定性的缺点,此外,像CO_(2)地质封存这样的低碳、零碳技术也需要利用深部地下储存空间来实现,因此,研究低碳背景下深部地下储存空间利用理论、技术及前景,对我国未来深部地下储存空间的高效利用具有重要的指导作用。【方法】在调研国外深部地下储存空间类型及利用历史基础上,结合我国深部地下储存空间利用现状,划分深部地下储存空间利用的历史阶段,概括了深部地下储存空间多元化利用方向及现状,总结了利用深部地下储存空间建设地下储集设施的理论及技术现状,分析了我国在地下储集设施建设方面的理论及技术贡献,剖析了我国利用深部地下储存空间利用的问题和对策。【结果和结论】总体来看,人类利用深部地下储存空间的历史已有110 a,主要经历3个阶段:初期发展阶段(1915-1945年)、快速发展阶段(1946-1998年)、中国追赶到同步发展阶段(1999年至今)。我国大规模化利用深部地下储存空间的历史短,但在层状盐岩型储库及煤炭地下水库建设理论和技术方面,具有世界独创性和领先性,并发展了复杂地质条件下储气库建设理论和技术。目前我国建成的地下储集设施数量少、类型单一、应用场景单一,还没有建成含水层型储气库,在盐穴储氢、储氦、储油以及咸水层CO_(2)地质封存等方面还需要加强理论和技术攻关,在深部地下储存空间资源分配方面需要加强政府顶层设计及各部门协同。在“双碳”目标愿景下,我国深部地下储存空间发展前景广阔,地下储库将是我国大规模发展天然气、风光电、绿氢、碳埋存等产业的重要配套设施,未来地下储集设施建设行业具有千亿级别的产业规模,具有催生新技术及新产业的潜力,也是新质生产力发展的重要产业创新点。

摘要：目的设计三道胃动检测分析仪,并探讨该仪器在糖尿病胃动力障碍诊断中意义。方法依据在胃的体表投影区粘贴电极以测定胃的容积的变化,从而反映胃的运动及排空情况,设计三道胃动检测分析仪。应用该检测仪观测28例正常人及29例2型糖尿病胃动力障碍患者的导纳胃动图,并分析胃动相关波形的频率、强度与移行方向。结果检测及波形分析结果显示,健康人的胃运动频率分布于1.0～6.9次/min范围,餐后2.5～4.4次/min范围内胃运动的能量较空腹明显增强;空腹时可判别的胃运动移行波有(27.2±5.9)个/10min,其中正向移行波(14.0±3.2)个/10min,逆向移行波(7.3±4.0)个/10min,同步收缩波(6.4±7.3)个/10min,餐后正向移行波倾向增多,而同步收缩波则倾向减少。与健康人相比,糖尿病胃动力障碍患者的胃运动能量明显低于正常,正向移行波少于正常,而同步收缩波则多于正常。结论三道胃动检测分析仪可在非侵入情况下检测糖尿病胃动力异常。