Combining a new baseboard radiator with a fan coil system for improving heating performance and reduce energy consumption

In the present work, the heating performance of a new system combined with a new modified baseboard radiator and fan coil is investigated. Using longitudinal fins with special geometry and also forced airflow at the end of the system causes that at the lower inlet water temperature compared with the conventional models, higher heat output rate be obtained. The heat output rate of the new modified system is obtained by experimental metrology based on the European Standard No. EN-442. Temperature and velocity distribution in the room space is done by simulation of the modified system in the Flovent software. Computational fluid dynamics (CFD) results are validated against experimental results and there is a good agreement between them. Also, the energy consumption of the system during the winter season is calculated in TRANSYS software. Experimental results show that the heat output rate of a new modified heating system with inlet water temperature in the range of 45–55°C is on average 4.17 times higher compared with the conventional model. CFD simulation also showed that the combined system provides good thermal comfort conditions. Energy consumption of the new system reduced about 13% compared with conventional models.     

A numerical study on nonlinear DPL model for analyzing heat transfer in tissue during thermal therapy

In the present paper, therapeutic treatment of infected tumorous cells has been studied through mathematical modeling and simulation of heat transfer in tissues by using a nonlinear dual-phase lag bioheat transfer model with Dirichlet boundary condition. The components of volumetric heat source in this model such as blood perfusion and metabolism are assumed experimentally validated temperature-dependent function, which gives more accurate temperature distribution in tissues through this model. We have used the finite difference and RK (4, 5) techniques of numerical methods to solve the proposed problem and obtained the exact solution in a particular case. After comparison, we got a good agreement between them. We have used dimensionless quantities throughout this paper. The effect of relaxation and thermalization time with respect to dimensionless temperature distribution has been analyzed in the treatment process.     

酱香型白酒机械化堆积发酵生产试验探究

堆积发酵是酱香型白酒生产过程中重要的工艺环节,本研究通过对机械化堆积发酵试验探究,从堆积发酵温度、时间、入窖糟醅水分、酸度、淀粉、还原糖含量,堆积发酵过程中微生物变化规律以及主要功能微生物变化规律进行探究,并对试验结果的出酒率、优质品率、基酒的相似度与传统工艺进行比较分析。结果表明,机械化堆积发酵试验堆子温度能达到工艺要求,但堆子升温较传统工艺班组慢,堆积发酵时间延长;SPSS显著性分析入窖糟醅水分、酸度、淀粉含量、还原糖含量与传统班组不存在显著差异;堆积发酵过程形成了特有的微生态、生物酶类,富集了大量的酱香风味前体物质与中间体,为后期的窖池发酵奠定了菌系及物质基础,使堆积到达"二次制曲"作用;机械化试验班出酒率、优质品率与传统班组相比存在差距,但差异性不显著;机械堆积发酵不会对基酒色谱成分造成不利影响。机械化堆积仍存在一些不足,将进一步改进完善设备,继续开展试验,调节机械化工艺参数,实现提质增量,促进酱酒机械化推广应用。     

闭式外腔循环太阳能墙集热效果实验研究

文章设计了闭式外腔循环太阳能墙系统,从理论和实验两方面研究太阳能墙传热传质规律。以大连市冬季为研究背景,基于对实验测温点不同时刻的持续监测,从逐时曲线中分析了不同环境下闭式外腔循环系统内部温度以及室内获得热量后室温的变化情况。结果表明,太阳能墙集热效率与太阳辐射强度密切相关,在晴朗天气下,白天部分时段单一太阳能墙就能满足采暖要求,不满足采暖要求时可以选择空气源热泵辅助采暖。     

汽蚀对离心泵性能影响的实验研究

离心泵长时间运转后,会出现危害严重的汽蚀现象,造成泵性能下降,严重时影响泵的效率、寿命,甚至造成离心泵内部部件损坏。文章通过改变进口压力的方法对单泵、双泵并联、双泵串联等工况下汽蚀对离心泵性能影响进行实验研究。结果表明:当进口压力小于输送液体的饱和蒸汽压时,液体开始发生气化并伴随气泡产生,表明泵内发生汽蚀;汽蚀初期离心泵的效率开始下降,但表现不明显;随着汽蚀不断增大至严重汽蚀区时,Q 1~η曲线出现陡坡,效率出现明显下降并伴随嗡响。实验证明采用提高泵的进口压力等措施可适当减小汽蚀对泵性能的不利影响。     

空压机润滑油系统可靠性试验研究

对空压机润滑系统进行分析,提出了一种润滑油压力调节机构,保证了空压机在高油温时油压正常,为空压机运动件提供充分润滑,从而提高空压机运行的可靠性。实验证明了该机构是可靠的,为空压机润滑系统设计提供了参考依据。     

Flow Cytometry: From Experimental Design to Its Application in the Diagnosis and Monitoring of Respiratory Diseases

Recent advances in the field of flow cytometry (FCM) have highlighted the importance of incorporating it as a basic analysis tool in laboratories. FCM not only allows the identification of cell subpopulations by detecting the expression of molecules in the cell membrane or cytoplasm, but it can also quantify and identify soluble molecules. The proper functioning of the FCM requires six fundamental systems, from those related to the transport of events to the systems dedicated to the analysis of information. In this review, we have identified the main considerations that every FCM user must know for an optimal antibody panel design, the quality systems that must govern the FCM protocols to guarantee reproducible results in research or clinical laboratories. Finally, we have introduced the current evidence that highlights the relevance of FCM in the investigation and clinical diagnosis of respiratory diseases, establishing important advances in the basic and clinical study of diseases as old as Tuberculosis along with the recent proposals for the monitoring and classification of patients infected with the new SARS-CoV2 virus.     

利用香菇菌丝体发酵藜麦及其发酵产物中粗多糖的抗氧化评价

以藜麦为固体培养基,利用香菇菌丝体将其发酵,通过正交试验设计探讨碳源、氮源、碳氮源添加比例、时间等因素对发酵产物中粗多糖含量的影响,测定最适发酵条件下发酵产物中粗多糖抗氧化活性。最终得出以粗多糖为目标产物的最适发酵条件为:碳源为淀粉,氮源为牛肉膏,碳氮源添加比例5:1,发酵时间15 d;在此条件下,香菇与藜麦的发酵产物中粗多糖含量达(58.89±1.33)mg/g,较未发酵藜麦提升了31倍;且其对DPPH·自由基和ABTS·^+自由基均表现出较好的体外清除效果,当粗多糖浓度为20 mg/mL时,其对DPPH·自由基和ABTS·^+自由基的清除能力均达到最高,分别为76.57%与60.16%。利用香菇菌丝体发酵藜麦后,能够大大提升藜麦培养基中多糖的含量,且发酵后的粗多糖具有较好的抗氧化能力,为发酵产物作为功能性食品的可行性提供一定数据支持。     

单组份聚氨酯炮孔填塞剂应用性试验

炮孔填塞是爆破施工过程中的一个关键环节,也是践行精细爆破设计理论的重要措施。传统的炮泥填塞存在着诸多不足,为此,研制了以聚氨酯为基材的TK炮孔填塞剂,通过大量基础性能研究和隧道现场工业性试验,论证了其作为炮孔填塞材料可降低炸药单耗,提高单循环进尺和炮孔利用率,减小空气冲击波、爆破噪声等有害效应的影响,且是安全可靠的。TK炮孔填塞剂优良的填塞效果、方便快捷的施工方法及显著的经济效益,方便于在爆破工程中推广应用。