摘要：为了建立能够准确反映转子支承系统真实结构的数学模型,提出基于模型确认辨识转子系统非线性支承刚度参数,并建立转子支承系统的非线性动力学模型的方法。采用自由状态下的转子模态测试数据对转子模型进行修正与确认,建立准确的转子模型。在此基础上,对转子支承系统开展低幅值激励的模态测试,辨识其线性支承刚度参数,从而建立转子支承系统的底层线性模型。对转子支承系统开展不同激励水平下的恒位移振动测试,确定支承非线性刚度的函数形式,并进一步识别支承非线性刚度参数,最终建立转子支承系统的非线性动力学模型。设计加工了考虑非线性支承因素的转子系统,采用该方法建立的转子支承系统底层线性模型,与实际结构的模态频差在5%以内,模态置信准则(MAC)值在0.89以上,具有良好的相关性;进一步建立转子支承系统的非线性动力学模型,将模型预测的响应与转动试验数据进行对比,结果表明:所提出的方法能够基本准确地反映真实结构的非线性动力学特性。

摘要：近几年,大数据、人工智能等技术在各行业中普遍应用,本文针对康养资源的协同分配问题,融合大数据、人工智能、区块链技术设计资源共享多方协同的智慧康养服务模式,以平台为支撑,实现各类康养资源的缘端汇聚,并针对康养需求实现资源的智能匹配,并设计实现了智慧康养服务平台,实现康养服务资源的优势互补。

摘要：封隔器作为关键的井下生产工具,在保护油气安全生产和提高生产效率方面发挥着重要作用,但在高温高压的复杂作业环境下,由于其承受的轴向载荷过大,容易出现失效情况。以封隔器轴向载荷对研究对象,考虑焦耳-汤姆孙效应建立了测试与生产工况下的温-压耦合预测模型和温-压耦合作用下的封隔器载荷计算模型,分析了产量、封隔器下入深度及气体相对密度对封隔器承受载荷的影响。研究结果表明:焦耳-汤姆孙效应对高温高压井井筒温度和压力的分布有显著影响,考虑焦耳-汤姆孙效应的计算结果更符合现场实际情况;封隔器轴向载荷增加到极限值时,存在失效的风险,同时封隔器轴向载荷随着产量、封隔器下入深度和气体相对密度的增加而增大,产量从20万m^(3)/d增加到100万m^(3)/d时,封隔器轴向载荷增加152.33 kN;封隔器下入深度增加1500 m时,封隔器轴向载荷增加140 kN;气体相对密度增加0.08时,封隔器轴向载荷增加9.83 kN。研究结果可为高温高压井封隔器优化设计提供理论基础。

摘要：Two-dimensional steady Reynolds-averaged Navier-Stokes （RANS） equations with transition shear stress transport （SST） model were solved to investigate the effects of Gumey flaps on the aerodynamic performance of a low Reynolds number airfoil. This airfoil was designed for flight vehicles operating at 20 km altitude with freestream velocity of 25 rn/s. The chord length （C） of this airfoil is 5 m and the corresponding Reynolds number is 7.76× 10^5. Gurney flaps with the heights ranging from 0.25%C to 3%C were investigated. It has been shown that Gurney flaps can enhance not only the prestall lift but also lift-to-drag ratio in a certain range of angles of attack. Specially, at cruise angle of attack （3°）, Gurney flap with the height of 0.5%C can increase lift-to-drag ratio and lift coefficient by 1.6% and 12.8%, respectively. Furthermore, the mechanisms of Gumey flaps to improve the aerodynamic performance were illustrated by analyzing the surface pressure distribution, streamlines and trailing-edge flow structure for this low Reynolds number airfoil. Specially, distinguished from some other numerical researches, the flow details such as the laminar separation bubble and transition phenomena for low Reynolds number airfoil with Gumey flaps were investigated and it was found that Gurney flaps can delay the transition onset position at small angles of attack （≤2°）. However, with the increase of angles of attack, Gurney flaps will promote the boundary layer transition.

摘要：采用地质聚合物固化技术处理钍基熔盐堆运行过程中产生的含氟放射性废液。以水玻璃(硅铝酸钠水溶液)和粉煤灰为固化基材对模拟含氟放射性废液进行固化处理。通过设计四因素四水平的正交实验,形成16组不同的地质聚合物固化配方,在60℃条件下养护28 d,对制得的地质聚合物固化体进行抗压强度、抗浸泡性和抗浸出性能测试。实验结果表明:当固化配方为水玻璃模数1.5、水灰比0.35或0.40、碱激发剂质量分数30%、F-质量分数4%时,制备得到的地质聚合物固化体的抗压强度为47 MPa,在(25±5)℃、去离子水条件下浸泡90 d后的抗压强度损失为13.75%,Co^(2+)、Sr^(2+)和Cs^(+)第42天的浸出率和42 d累积浸出分数均满足GB 14569.1—2011要求;F-第42天浸出质量浓度为2.81 mg/L,低于GB 5083.3—2007的限值要求(100 mg/L)。可见,该配方实现了对模拟含氟放射性废液的有效固化,后续可进一步探究养护条件(包括温度、湿度和时间)对地质聚合物固化体性能的影响,以期为含氟放射性废液的稳定化处理提供一条行之有效的技术路线。

摘要：Summary of main observation and conclusion To combat multidrug-resistant Gram-positive bacteria,new antimicrobials particularly those with novel mechanism of action are badly *** with conventional antibiotics which are typical inhibitors,small-molecule activators of bacterial CIpP represent a new class of *** ClpP activator has been developed for clinical ***,we conducted a screening on our library of benga-mide-like ring opened analogues and found that L472-2 possesses a low minimum inhibitory concentration(MIC)against *** and shows no activity for ClpP activation in vitro,but it displayed reduced antibacterial activity against *** with clpP *** order to obtain bengamide analogues that activate ClpP in vitro as well as possess antibacterial activity,we perform further structural modifications starting from *** 37 re-mains the antimicrobial activity and activation of ClpP protein in vitro,which could be viewed as a new chemical scaffold for ClpP activators and worthy of further investigation.

摘要：The GABAergic neurons in the parafacial zone（PZ） play an important role in sleep-wake regulation and have been identified as part of a sleep-promoting center in the brainstem, but the long-range connections mediating this function remain poorly characterized. Here, we performed whole-brain mapping of both the inputs and outputs of the GABAergic neurons in the PZ of the mouse brain. We used the modified rabies virus Env A-DG-Ds Red combined with a Cre/lox P gene-expression strategy to map the direct monosynaptic inputs to the GABAergic neurons in the PZ, and found that they receive inputs mainly from the hypothalamic area, zona incerta, and parasubthalamic nucleus in the hypothalamus; the substantia nigra, pars reticulata and deep mesencephalic nucleus in the midbrain;and the intermediate reticular nucleus and medial vestibular nucleus（parvocellular part） in the pons and *** also mapped the axonal projections of the PZ GABAergic neurons with adeno-associated virus, and defined the reciprocal connections of the PZ GABAergic neurons with their input and output nuclei. The newlyfound inputs and outputs of the PZ were also listed compared with the literature. This cell-type-specific neuronal whole-brain mapping of the PZ GABAergic neurons may reveal the circuits underlying various functions such as sleep-wake regulation.

摘要：为了探究夏季不同观赏竹的光合适应性、固碳释氧能力的强弱及其影响因素,在全球变暖背景下筛选出能够提高绿地碳汇效益的竹类植物。通过测定黄甜竹、佛肚竹、短穗竹、花叶唐竹、黄金间碧竹5种福建乡土观赏竹夏季的光合日变化参数和光响应曲线,分析了光合作用影响因子间的互作关系及其对固碳释氧量的影响。结果表明,最适用于5种观赏竹的光响应模型为直角双曲线修正模型,竹种间固碳量与净光合速率的相关性达到极显著水平,而5种观赏竹的净光合速率日变化影响因子各不相同,黄甜竹的净光合速率与蒸腾速率、气孔导度呈极显著相关,佛肚竹的净光合速率与蒸腾速率呈极显著相关,花叶唐竹的净光合速率与水分利用效率呈显著相关,短穗竹、黄金间碧竹的净光合速率与气孔导度呈极显著相关。黄金间碧竹、短穗竹、佛肚竹的净光合速率、气孔导度、胞间CO_(2)浓度日均值较高,其固碳释氧量也相对较高。综上,不同观赏竹的光适应性及其固碳能力存在差异性,黄金间碧竹在夏季高温下的生态适应性较好。

摘要：为实现工业固废应用于实体工程中,实现废物利用、节能减排的目标,以粉煤灰、粒化高炉矿渣粉、电石渣为主要原料,在室温条件下采用固体碱激发剂制备了地聚物干粉砂浆。以原粉煤灰和细粉煤灰掺量比、矿渣掺量、电石渣掺量和碱激发剂掺量为因子设计正交试验,通过测试地聚物干粉砂浆的力学性能,得出干粉砂浆的最佳配合比;通过最优配合比制备M10等级的砂浆,并进行微观分析,揭示强度增强机理。结果表明:当原粉煤灰与细粉煤灰的比例为2∶8、粉煤灰与矿渣的掺加比例为9∶1、电石渣掺量为6%、激发剂掺量为2%时,M10等级砌筑砂浆的7 d抗压强度为11.9 MPa,28 d抗压强度达到15.9 MPa,保水性和稠度均符合现行规范要求。结合SEM分析表明,地聚物砂浆中生成大量C–(A)–S–H和N–A–S–H凝胶产物,促使样品结构紧密、砂浆强度显著提升。

摘要：目的了解中国城市烟草广告、促销现状以及相关因素。方法在北京、上海、沈阳、长沙、广州和银川6个城市，采用累计概率比例抽样和简单随机抽样方法，对4815名18岁以上的吸烟者进行问卷调查。结果烟草广告覆盖吸烟人群最广的2种途径分别为广告牌（35．6％）、电视（34．4％）。商家最爱使用的促销手段是赠送礼品（23．1％），其次为赠送香烟（13．9％）。长沙市的吸烟者通过广告牌（Х^2=562．474，P〈0．001）以及电视（Х^2=265．570，P〈0．001）途径获取烟草广告的比例较高。长沙市吸烟者巾可看到烟草相关新闻的比例较高（Х^2=58．314，P〈0．001）。多因素logistic回归分析结果显示，生活所在城市及学历情况与“使想吸烟事物”的关注度有关。结论中国城市烟草制品广告及促销活动较为普遍，各地控烟法律法规执行效果不一，尽快完善并统一相关立法势在必行。