mixing

摘要： Upper ocean mixing plays a key role in the atmosphere-ocean heat transfer and sea ice extent and thickness via modulating the upper ocean temperatures in the Arctic Ocean.Observations of diffusivities in the Arctic that directly indicate the ocean mixing properties are sparse.Therefore,the spatiotemporal pattern and magnitude of diapycnal diffusivities and kinetic energy dissipation rates in the upper Arctic Ocean are important for atmosphere-ocean heat transfers and sea ice changes.These were first estimated from the Ice-Tethered Profilers dataset(2005–2019)using a strain-based fine-scale parameterization.The resultant mixing properties showed signifi cant geographical inhomogeneity and temporal variability.Diapycnal diff usivities and dissipation rates in the Atlantic sector of the Arctic Ocean were stronger than those on the Pacific side.Mixing in the Atlantic sector increased significantly during the observation period;whereas in the Pacific sector,it weakened before 2011 and then strengthened.Potential impact factors include wind,sea ice,near inertial waves,and stratifi cation,while their relative contributions vary between the two sectors of the Arctic Ocean.In the Atlantic sector,turbulent mixing dominated,while in the Pacific sector,turbulent mixing was inhibited by strong stratification prior to 2011,and is able to overcome the stratifi cation gradually after 2014.The vertical turbulent heat fl ux constantly increased in the Atlantic sector year by year,while it decreased in the Pacific sector post 2010.The estimated heat flux variability induced by enhanced turbulent mixing is expected to continue to diminish sea ice in the near future.

摘要： Cemented paste backfill(CPB)has been one of the best practical approaches for tailings management and underground goaf treatment.Paste rheology is a science to study the flow and deformation behaviors of paste or filling body under the effects of stress,strain,temperature,and time during the CPB process.The goal of studying paste rheology is to solve the engineering problems existing in four key processes;that is,paste rheology should meet the engineering demands of thickening,mixing,transportation,and backfilling.However,paste rheology is extremely complicated due to its high concentration,materials complexity,and engineering characteristics of non-stratification,nonsegregation,and non-bleeding.The rheological behavior of full tailings in deep thickening,rheological behavior of paste in mixing and pipeline transportation,and rheological behavior of filling body are introduced and discussed:(1)gel point,compressive yield stress,and the hindered settling function are adopted to characterize the rheological properties of full tailings in deep thickening.Combination of Coe-Clevenger theory and Buscall-White theory can also analyze the thickening performance in the whole area of deep cone thickener;(2)yield stress and viscosity are consistent with the evolution trend of the relative structure coefficient of paste in mixing;(3)coupling effect of wall slip and time-temperature dependency has a significant influence on the rheological properties and pipeline transportation;(4)damage variable is introduced to the Burgers model to describe the creep damage of the filling body.However,in-depth and systematic studies were still needed to establish a complete theoretical system of paste rheology in metal mines.

摘要： To quantitatively investigate the water mass transport of mesoscale eddies,the mass transport induced by a simulated anticyclonic eddy in the South China Sea was evaluated by using the Regional Ocean Modelling System(ROMS)and a built-in passive tracer module.The results indicate that the eddy can trap and transport 51%of the initial water in the eddy core to 689 km from its origin during its lifetime of 100 days,with a stable loss rate of 6‰per day.During propagation,there is drastic horizontal water exchange between the inside and outside of the eddy.Meanwhile,the vertical mass transport is signifi cant,and 65%of the water initially in the mixed layer of the eddy is eventually detrained into the subsurface.A tracer budget analysis of eddy shows that advection is the dominant dynamic process of transport,while the eff ect of mixing is weak,and horizontal process plays a controlling role.Horizontal and vertical advection exhibit opposite patterns and strongly off set each other.Particularly,a distinct dipole pattern is found in the local velocity fi eld of the eddy,with signifi cant convergence(downwelling)and divergence(upwelling)zones in the anterior and posterior of the eddy,respectively,which is likely related to the driving mechanism of the westward propagation of the eddy.The dipole further induces a vertical overturning cell,through which the surface water in the anterior of the eddy detrains into the subsurface by downwelling and resurface from the posterior of the eddy by upwelling and gradually spreads out of the eddy.The temporal variability in the tracer budget is signifi cant,in which horizontal advection is dominant.The propagation acceleration and temporal derivative of the deformation rate are highly correlated with tracer transport,suggesting the potential eff ect of the temporal instability of eddies on the eddy mass transport.

摘要： Electrokinetic(EK)micromixers have been widely studied in the past decade for biochemical applications,biological and chemical analysis,etc.Unfortunately,almost all EK mixers require different electrical conductivity between the two fluids to be mixed,which has greatly limited their wide applications,in cases where the two streams to be mixed have equivalent electrical conductivity.Here we show that mixing enhancement between two fluids with identical conductivity can be achieved in an EK micromixer with conductive sidewalls,where the electric field is in transverse direction of the flow.The results revealed that the mixing became stronger with increased conductivity value.This mixing method provides a novel and convenient strategy for mixing two liquids with the same or similar electrical conductivity in microfluidic systems,and could potentially serves as a powerful tool for sample preparation in applications such as liquid biopsy,and environmental monitoring,etc.

摘要： ther than being forced to take sides among major countries, what Asia-pacific needs now is pragmatic cooperation in addressing pressing development issues.DURING his May tour of the Republic of Korea (ROK) and Japan, mixing up secu-rity and trade, U.S. President Joe Biden made some announcements based on an a ssumption. So is his administration’s criticism of Chinese State Councilor and Foreign Minister Wang Yi’s recent visit to eight Pacific island countries.

摘要： The Dibdibba aquifer is considered to be the main source in the Al-Zubair area because agriculture depends on it to provide grazing water in the area.The groundwater well samples were collected from the shallow Dibdibba Aquifer in Basra Province,southern Iraq,through the dry and wet period for 37 water samples were collected,to investigate the water quality deterioration,which is a hydrogeochemical modeling study where used to represent the groundwater mixing evaluation.The physicochemical parameter results show the spatial and temporal variations along the groundwater flow path.A Durov diagram of the studied samples shows water type Na-SO_(4),which is represented by mixing waters that may be affected by dissolution.Inverse geochemical model ratio results of the groundwater well samples have shown high mixing ratios in the east and southeast regions of the study area.The stable isotope composition of groundwater samples indicated that the recharge source of the Dibdibba aquifer is meteoric water influenced by vapor water from the Arabian Gulf.The stable isotope results have shown that the enrichment ofδO values is relatively linked with high salinity concentration and indicated the mixing between the upper unconfined and the lower confined,especially in the eastern and southern parts of the study area.These findings of geochemical modeling and isotopes indicated an increasing groundwater quality deterioration.Thus,we recommended avoiding these areas for intensive extraction of groundwater.

摘要： In this paper, we first present a Gearhart-Pruss type theorem with a sharp bound for m-accretive operators. Then we give two applications:(1) we give a simple proof of the result proved by Constantin et al. on relaxation enhancement induced by incompressible flows;(2) we show that shear flows with a class of Weierstrass functions obey logarithmically fast dissipation time-scales.

摘要： Shock-driven hydrodynamic instabilities in a plasma usually lead to interfacial mixing and the generation of electromagnetic fields,which are nonequilibrium processes coupling kinetics with meso-and macroscopic dynamics.The understanding and modeling of these physical processes are very challenging tasks for single-fluid hydrodynamic codes.This work presents a new framework that incorporates both kinetics and hydrodynamics to simulate shock waves and hydrodynamic instabilities in high-density plasmas.In this hybrid code,ions are modeled using the standard particle-in-cell method together with a Monte Carlo description of collisions while electrons are modeled as a massless fluid,with the electron heat flux and fluid–particle energy exchange being considered in the electron pressure equation.In high-density plasmas,Maxwell’s equations are solved using Ohm’s law instead of Ampere’s law.This hybrid algorithm retains ion kinetic effects and their consequences for plasma interpenetration,shock wave propagation,and hydrodynamic instability.Furthermore,we investigate the shock-induced(or gravity-induced)turbulent mixing between a light and a heavy plasma,where hydrodynamic instabilities are initiated by a shock wave(or gravity).This study reveals that self-generated electromagnetic fields play a role in the formation of baroclinic vorticity along the interface and in late-time mixing of the plasmas.Our results confirm the ability of the proposed method to describe shock-driven hydrodynamic instabilities in a plasma,in particular,nonequilibrium processes that involve mixing and electromagnetic fields at the interface.

摘要： The self-interacting dark matter(SIDM)model is an ideal candidate for explaining the discrepancy between small-scale structure observations and predictions by the prevailing collisionless cold dark matter(CDM)model.SIDM indicates the existence of a light mediator with a typical mass of 10 MeV.Searching for SIDM particles has therefore become one important alternative to the traditional weakly interacting massive particles(WIMPs)in direct detection experiments such as PandaX.Of note,the constraints obtained from direct detections are associated with the unknown mixing parameter(such as photon kinetic mixing)that describes the strength of the coupling between the mediator and ordinary particles。

摘要： The effects of biological heating on the upper-ocean temperature of the global ocean are investigated using two ocean-only experiments forced by prescribed atmospheric fields during 1990–2007,on with fixed constant chlorophyll concentration,and the other with seasonally varying chlorophyll concentration.Although the existence of high chlorophyll concentrations can trap solar radiation in the upper layer and warm the surface,cooling sea surface temperature(SST)can be seen in some regions and seasons.Seventeen regions are selected and classified according to their dynamic processes,and the cooling mechanisms are investigated through heat budget analysis.The chlorophyll-induced SST variation is dependent on the variation in chlorophyll concentration and net surface heat flux and on such dynamic ocean processes as mixing,upwelling and advection.The mixed layer depth is also an important factor determining the effect.The chlorophyll-induced SST warming appears in most regions during the local spring to autumn when the mixed layer is shallow,e.g.,low latitudes without upwelling and the mid-latitudes.Chlorophyll-induced SST cooling appears in regions experiencing strong upwelling,e.g.,the western Arabian Sea,west coast of North Africa,South Africa and South America,the eastern tropical Pacific Ocean and the Atlantic Ocean,and strong mixing(with deep mixed layer depth),e.g.,the mid-latitudes in winter.

摘要： 本发明公开了一种基于OPLS‑SPA‑MIX‑PLS的木材弹性模量预测方法，利用正交偏最小二乘法对获取的近红外光谱数据进行预处理，实现散射光、基线漂移和高频噪声等干扰因素的去除；接着，运用连续投影算法(SPA)提取有效的波长信息；最后，运用MIX‑PLS多专家模型寻找不同树种下的板材试件近红外光谱与板材弹性模量之间的关联，并利用归一化指数函数进行叠加，实现木材弹性模量光谱预测模型的构建，能够有效提高泛化能力。

摘要： 本发明创造提供了一种链接mix文件筛选方法、装置、网盘及存储介质，其中，所述链接mix文件筛选方法包括：监听收集区内的文件夹操作，获取文件夹的运动轨迹；根据文件夹的运动轨迹确定文件筛选规则；根据文件筛选规则对文件夹内部的文件进行筛选，并将文件属性符合文件筛选规则的文件缓存于收集区中。本发明创造所述的链接mix文件筛选方法、装置、网盘及存储介质能降低网盘生成分享链接前的文件筛选难度，从而提升文件筛选的效率。

摘要： 本发明提供一种基于加密Mix‑Zone的VANETs中车辆节点位置隐私保护方法，涉及网络安全技术领域。每个车辆节点在进入VANETs后其车辆单元之间经过安全认证，确认车辆节点合法后可以进行安全通信，信任的车辆节点间可协商对称密钥用于之后的安全通信；车辆单元OBU在假名即将过期时，且位于无RSU部署的区域内，与其他车辆节点共同协商组密钥；在RSU未覆盖的区域内，车辆节点的假名即将过期且无其他车辆节点请求开启建立加密Mix‑zone时，建立加密Mix‑zone，接收到该请求的假名即将过期的车辆节点合作更换假名。本发明有效提高车辆节点的隐私保护强度，有效的解决了车载网建设初期，RSU未能全面覆盖的情况下车辆面对的位置隐私威胁，减少中间密钥生成和组密钥更新所产生的损耗。

摘要： 一种基于虚拟Mix‑zone的VANETs位置隐私保护系统及方法。第三方信任机构在初始化阶段向车辆单元所在车辆节点和路边单元颁发公私钥对、假名和证书；控制服务器检测车辆节点假名更换，负责车辆节点假名更换过程、信誉值颁发和更新；车辆单元随车辆节点移动过程中在不同的路边单元之间切换移动，车辆单元在车辆节点的当前假名即将过期且无其他车辆节点请求建立虚拟Mix‑zone时请求建立虚拟Mix‑zone。本发明将基于虚拟Mix‑zone的位置隐私保护方案应用在VANETs中车辆节点的位置隐私保护中，在车辆密度不稳定时有效提高车辆节点的隐私保护强度；使用信誉机制激励自私车辆节点进行合作更换假名，有效保证目标车辆搜索到一定数量合作者，进一步保证车辆节点的位置隐私保护强度。

摘要： 本发明公开了一种基于手机信令数据和Mix‑Markov模型的出行路径提取方法。首先对手机信令数据进行“降噪”预处理，结合基于时空信息的DBSCAN聚类算法，确定有效轨迹点；然后根据隐马尔可夫模型分析待匹配点与候选点之间的空间关系，建立发射概率向量与转移概率矩阵；最后根据维特比算法获取最优路径，即得到地图匹配结果，完成手机用户的出行路径提取。本发明在进行用户轨迹数据地图匹配时，仅需要输入用户的轨迹数据获取用户出行路径，计算速度快，匹配结果准确，为用户出行特征的分析提供了充分的研究数据。

摘要： 基于Mix‑CV‑CNN网络的三维转动舰船目标识别方法，涉及目标识别领域。本发明是为了解决目前舰船识别方法在针对运动状态的舰船进行目标识别时会出现模糊、散焦的现象进而造成的舰船目标识别准确率低的问题。本发明具体过程为：获取待识别的SAR三维转动舰船目标图像，将待识别的SAR三维转动舰船目标图像输入到训练好的Mix‑CV‑CNN模型中获取SAR三维转动舰船目标的类别。Mix‑CV‑CNN模型采用Mix‑CV‑CNN前向传播和Mix‑CV‑CNN反向传播方法训练，Mix‑CV‑CNN前向传播为将训练集中的图像输入到构建的Mix‑CV‑CNN模型中输出舰船目标的类别；Mix‑CV‑CNN反向传播为利用前向传播获得的全连接层输出向量获取Mix‑CV‑CNN模型中每一层的误差项，并利用误差项更新卷积层和全连接层的权值获得训练好的Mix‑CV‑CNN模型。本发明用于动态舰船目标的识别。

摘要： 本发明创造提供了一种链接mix文件筛选方法、装置、网盘及存储介质，其中，所述链接mix文件筛选方法包括：监听收集区内的文件夹操作，获取文件夹的运动轨迹；根据文件夹的运动轨迹确定文件筛选规则；根据文件筛选规则对文件夹内部的文件进行筛选，并将文件属性符合文件筛选规则的文件缓存于收集区中。本发明创造所述的链接mix文件筛选方法、装置、网盘及存储介质能降低网盘生成分享链接前的文件筛选难度，从而提升文件筛选的效率。

摘要： 本发明涉及分子生物学技术领域，其目的是提供一种高效型2×SYBR qPCR Mix试剂，包括：Tris、MgCl2、Taq DNA聚合酶、dUTP、dNTP、2×SYBR GreenⅠ、甘油和甘露醇与蔗糖的混合液。本发明的另一目的是提供一种高效型2×SYBR qPCR Mix试剂的应用，包括以下步骤：1)将2×SYBR qPCR Mix试剂12.5ul，模板DNA100ng，Primer F和Primer R分别添加1ul，用ddH2O补充反应体系至25ul；2)采用三步法进行qPCR扩增检测，即完成2×SYBR qPCR Mix试剂的应用。本发明的2×SYBR qPCR Mix试剂可以有效提高DNA聚合效率，减少PCR扩增过程中形成的引物二聚体、非特异性扩增产物结合，显著提高扩增率。

摘要： 本发明公开了一种基于OPLS‑SPA‑MIX‑PLS的木材弹性模量预测方法，利用正交偏最小二乘法对获取的近红外光谱数据进行预处理，实现散射光、基线漂移和高频噪声等干扰因素的去除；接着，运用连续投影算法(SPA)提取有效的波长信息；最后，运用MIX‑PLS多专家模型寻找不同树种下的板材试件近红外光谱与板材弹性模量之间的关联，并利用归一化指数函数进行叠加，实现木材弹性模量光谱预测模型的构建，能够有效提高泛化能力。

摘要： 本发明涉及微生物发酵技术领域，公开了葡萄酒果酒专用酵母SY和丹尼斯克YO‑MIX300乳酸菌的新应用。本发明选择葡萄酒果酒专用酵母SY和丹尼斯克YO‑MIX300乳酸菌共同作用于蓝莓花的发酵中，所制备的发酵原浆具备较高的清除DPPH自由基活性和清除超氧阴根离子活性，以及含有更多的总黄酮和总酚，可以作为抗氧化保健品和化妆品的有效成分。