STREAMLINING EFFORTS BRING CHANGES TO OFFICE MISSIONS (CONTINUED)

The Bureau of High-Technology Research and Development (BHRD) BHRD is in charge of management for the research and; development activities in high-technology areas in CAS, including predicting the trends of high-technology development in the light of the demands for technology which is strategic, forward-

How to Optimize the Management of Science and Technology Funds in Colleges and Universities Based on the Policy of Streamlining Administration,Delegating Powers,Improving Regulation,and Strengthening Services

To advance the field of science and technology,we need to revitalize the development of science and technology through innovation.The development of science and technology has many beneficial implications on the revitalization of the country.For this reason,universities in China should give full attention to their role as the main propeller of science and technology.“Streamlining administration,delegating powers,improving regulation,and strengthening services”is a policy issued by the Chinese government for the management of science and technology funds in colleges and universities.Based on the policy of“streamlining administration,delegating powers,improving regulation,and strengthening services,”colleges and universities must optimize the management of science and technology funds for their efficient use.In this paper,we analyzed the importance of the policy and put forward an effective management strategy,aiming to improve the management of science and technology funds in colleges and universities.

Streamlining the Writing and Tutoring Process of English Major Theses With Stringent Tasks and Procedures

English thesis writing and tutoring process is traditionally loose and open-ended. Both students and teachers enjoy much liberty in the maneuver of different steps in the whole process, which, as it were, may cause a series of problems and dissatisfactions, consequently undermining the quality and significance. This paper is intended to explore a streamlined and systematic procedure to ensure both the students and teachers are doing their bit and make due contribution to the thesis perfection.

Investigation of pore geometry influence on fluid flow in heterogeneous porous media:A pore-scale study

Brazilian pre-salt reservoirs are renowned for their intricate pore networks and vuggy nature,posing significant challenges in modeling and simulating fluid flow within these carbonate reservoirs.Despite possessing excellent petrophysical properties,such as high porosity and permeability,these reservoirs typically exhibit a notably low recovery factor,sometimes falling below 10%.Previous research has indicated that various enhanced oil recovery(EOR)methods,such as water alternating gas(WAG),can substantially augment the recovery factor in pre-salt reservoirs,resulting in improvements of up to 20%.Nevertheless,the fluid flow mechanism within Brazilian carbonate reservoirs,characterized by complex pore geometry,remains unclear.Our study examines the behavior of fluid flow in a similar heterogeneous porous material,utilizing a plug sample obtained from a vugular segment of a Brazilian stromatolite outcrop,known to share analogies with certain pre-salt reservoirs.We conducted single-phase and multi-phase core flooding experiments,complemented by medical-CT scanning,to generate flow streamlines and evaluate the efficiency of water flooding.Subsequently,micro-CT scanning of the core sample was performed,and two cross-sections from horizontal and vertical plates were constructed.These cross-sections were then employed as geometries in a numerical simulator,enabling us to investigate the impact of pore geometry on fluid flow.Analysis of the pore-scale modeling and experimental data unveiled that the presence of dead-end pores and vugs results in a significant portion of the fluid remaining stagnant within these regions.Consequently,the injected fluid exhibits channeling-like behavior,leading to rapid breakthrough and low areal swept efficiency.Additionally,the numerical simulation results demonstrated that,irrespective of the size of the dead-end regions,the pressure variation within the dead-end vugs and pores is negligible.Despite the stromatolite's favorable petrophysical properties,including relatively high porosity and permeability,as well as the presence of interconnected large vugs,the recovery factor during water flooding remained low due to early breakthrough.These findings align with field data obtained from pre-salt reservoirs,providing an explanation for the observed low recovery factor during water flooding in such reservoirs.

Surpass Streamline血流导向术对颅内动脉瘤的疗效

目的了解Surpass Streamline血流导向术对颅内动脉瘤的疗效。方法选取2020年1月至2022年1月安徽医科大学附属宿州医院68例接受Surpass Streamline血流导向装置治疗的颅内动脉瘤患者。收集临床资料,观察患者术前术后血流动力学参数变化,以及术前和术后3、6、12个月的改良Rankin量表(mRS)评分变化,分析患者的影像学资料,观察动脉瘤闭塞情况。结果与术前相比较,患者术后的WSS、瘤颈血流速度降低,LSA、RRT、载瘤动脉及患侧M1的血流速度增加(P<0.05),而患者术前、术后对侧M1血流速度比较差异无统计学意义(P>0.05)。术后,随着时间的延长,患者的mRS评分为低级别占比逐渐增高,差异有统计学意义(P<0.05)。术后6个月及12个月患者的支架内狭窄发生率分别为7.35%、8.82%,动脉瘤完全闭塞发生率分别为52.94%、63.24%,差异无统计学意义(P>0.05)。68例患者经Surpass Streamline血流导向术治疗后,4例出现缺血性并发症,其中2例表现为视物模糊、皮质盲,1例为肢体无力,1例支架内血栓,经干预治疗均得到有效缓解。结论采用Surpass Streamline血流导向术治疗颅内动脉瘤有较好的疗效,能改善血流动力学,术后动脉瘤完全闭塞率较高,且安全性较好,值得临床推广。

Numerical investigation on the aerodynamic drag reduction based on bottom deflectors and streamlined bogies of a high-speed train

The complex structure of the bottom of a high-speed train is an important source of train aerodynamic drag.Thus,improving the bottom structure is of great significance to reduce the aerodynamic drag of the train.In this study,computational fluid dynamics(CFD)based on three-dimensional steady incompressible Reynolds-average Naiver-Stokes(RANS)equations and Realizable k-ε turbulence model were utilized for numerical simulations.Inspired by the concept of streamlined design and the idea of bottom flow field control,this study iteratively designed the bogies in a streamlined shape and combined them with the bottom deflectors to investigate the joint drag reduction mechanism.Three models,i.e.,single-bogie model,simplified train model,and eight-car high-speed train model,were created and their aerodynamic characteristics were analyzed.The results show that the single-bogie model with streamlined design shows a noticeable drag reduction,whose power bogie and trailer bogie experience 13.92%and 7.63%drag reduction,respectively.The range of positive pressure area on the bogie is reduced.The aerodynamic drag can be further reduced to 15.01%by installing both the streamlined bogie and the deflector on the simplified train model.When the streamlined bogies and deflectors are used on the eight-car model together,the total drag reduction rate reaches 2.90%.Therefore,the proposed aerodynamic kit for the high-speed train bottom is capable to improve the flow structure around the bogie regions,reduce the bottom flow velocity,and narrow the scope of the train’s influence on the surrounding environment,achieving the appreciable reduction of aerodynamic drag.This paper can provide a new idea for the drag reduction of high-speed trains.

Research on passenger flow control at metro transfer stations based on real-time flow calculation of streamlines

Purpose – The volume of passenger traffic at metro transfer stations serves as a pivotal metric for theorchestration of crowd flow management. Given the intricacies of crowd dynamics within these stations andthe recurrent instances of substantial passenger influxes, a methodology predicated on stochastic processesand the principle of user equilibrium is introduced to facilitate real-time traffic flow estimation within transferstation streamlines.Design/methodology/approach – The synthesis of stochastic process theory with streamline analysisengenders a probabilistic model of intra-station pedestrian traffic dynamics. Leveraging real-time passengerflow data procured from monitoring systems within the transfer station, a gradient descent optimizationtechnique is employed to minimize the cost function, thereby deducing the dynamic distribution of categorizedpassenger flows. Subsequently, adhering to the tenets of user equilibrium, the Frank–Wolfe algorithm isimplemented to allocate the intra-station categorized passenger flows across various streamlines, ascertainingthe traffic volume for each.Findings – Utilizing the Xiaozhai Station of the Xi’an Metro as a case study, the Anylogic simulation softwareis engaged to emulate the intra-station crowd dynamics, thereby substantiating the efficacy of the proposedpassenger flow estimation model. The derived solutions are instrumental in formulating a crowd controlstrategy for Xiaozhai Station during the peak interval from 17:30 to 18:00 on a designated day, yielding crowdmanagement interventions that offer insights for the orchestration of passenger flow and operationalgovernance within metro stations.Originality/value – The construction of an estimation methodology for the real-time streamline traffic flowaugments the model’s dataset, supplanting estimated values derived from surveys or historical datasets withreal-time computed traffic data, thereby enhancing the precision and immediacy of crowd flow managementwithin metro stations.

Numerical Study of a Three-Dimensional Laminar Flow in a Rectangular Channel with a 180-Degree Sharp Turn

This study presents a numerical analysis of three-dimensional steady laminar flow in a rectangular channel with a 180-degree sharp turn. The Navier-Stokes equations are solved by using finite difference method for Re = 900. Three-dimensional streamlines and limiting streamlines on wall surface are used to analyze the three-dimensional flow characteristics. Topological theory is applied to limiting streamlines on inner walls of the channel and two-dimensional streamlines at several cross sections. It is also shown that the flow impinges on the end wall of turn and the secondary flow is induced by the curvature in the sharp turn.

A Variational Multiscale Method for Particle Dispersion Modeling in the Atmosphere

A LES model is proposed to predict the dispersion of particles in the atmosphere in the context of Chemical,Biological,Radiological and Nuclear(CBRN)applications.The code relies on the Finite Element Method(FEM)for both the fluid and the dispersed solid phases.Starting from the Navier-Stokes equations and a general description of the FEM strategy,the Streamline Upwind Petrov-Galerkin(SUPG)method is formulated putting some emphasis on the related assembly matrix and stabilization coefficients.Then,the Variational Multiscale Method(VMS)is presented together with a detailed illustration of its algorithm and hierarchy of computational steps.It is demonstrated that the VMS can be considered as a more general version of the SUPG method.The final part of the work is used to assess the reliability of the implemented predictor/multicorrector solution strategy.

膨胀床吸附高效纯化牛血红蛋白

探索了将膨胀床吸附层析应用于动物血液蛋白质的提取 ,尝试了直接从牛血红细胞破碎液中纯化血红蛋白 .对该过程采用的吸附介质及 pH值、离子强度、温度、洗脱条件等因素对高铁血红蛋白生成、产品纯度以及回收率等的影响进行探索 .选择了最佳吸附介质StreamlineSP ,确定了优化的吸附条件为 :吸附过程选用离子强度为 10mmol·L-1的磷酸盐缓冲系统 ,进料线流速 3 3cm·min-1,进料 pH值 6 6 ,改变缓冲液pH值为 7 2进行洗脱 ,操作温度 4℃ .该技术省去了离心去除碎片步骤 ,有效地控制了纯化过程中无载氧能力的高铁血红蛋白的生成 ,动态吸附容量达到 70～ 75mg·ml-1,只经一步操作产品纯度达电泳纯 ,高铁血红蛋白含量仅为5 4 % .与现有的膜过滤 -层析纯化方法相比 ,膨胀床吸附法操作时间短 ,提取收率高 ,产品活性损失小 ,是一种简捷、高效。

Large_scale Isolation and Purification of R_phycoerythrin from Red Alga Palmaria palmata Using the Expanded Bed Adsorption Method

R-phycoerythrin, a light-harvesting protein in some marine algae, and can be widely used in medicine, was isolated and purified from a red alga, Palmaria palmata (Lannaeus) Kuntze, using the streamline column (expanded bed adsorption) combined with ion-exchange chromatography. Because the crude extract was applied to the column upwardly, the column would not be blocked by polysaccharides usually very abundant in the extract of marine alga, this kind of blockage could hardly lie overcome in ordinary chromatographic column. After applying the crude extract containing 0.5 mol/L (NH4)(2)SO4, (NH4)(2)SO4 solution of different concentrations (0.2 mol/L, 0.1 mol/L and 0.05 mol/L) was used to elute the column downwardly and the eluates were collected and desalted. The desalted eluates were then applied onto all ion-exchange chromatographic column loaded with Q-sepharose for further purification of the R-phycoerythrin. Through these two steps, the purity (OD565/OD280) of the R-phycoerythrin from P. palmata was up to 3.5, more than 3.2, the commonly accepted criterion for purity, and the yield of the purified R-phycoerythrin could reach 0.122 mg/g of frozen P. palmata, much higher than that of phycobiliproteins purified with the previous methods. The result indicated that the cost of R-phycoerythrin will drop down with the method reported in this article.

一种地形图快速扫描矢量化方法

提出了利用adobe的Steamline以及AutoCAD、CorelDraw对纸介图进行扫描矢量化的方法 ,该方法的主要功能是原图扫描、扫描图矢量化及矢量图校正的处理。经实践应用 ,其速度、精度等均可满足一般地理信息系统的要求。

离子交换树脂吸附分离人凝血酶原复合物研究

用静态方法研究了扩张床用离子交换树脂StreamlineDEAE对人凝血酶原复合物(以下简称PCC)的吸附性能,在此基础上初步考察了扩张床条件下的穿透吸附效果。结果表明:在静态条件下,离子强度和缓冲液浓度对平衡吸附量有着较大的影响;StreamlineDEAE对PCC的吸附符合Langmuir模型,在15℃和25℃条件下其饱和吸附量分别为66.67mg/g和80.00mg/g。在扩张床条件下,StreamlineDEAE对PCC的动态吸附量达36.36mg/mL;用2.0mol/LNaCl、0.01mol/L磷酸缓冲液浓度、pH=7.0的洗脱液对吸附了PCC的凝胶树脂进行洗脱,静态洗脱率达80%以上,动态洗脱曲线表明有较好的洗脱效果。StreamlineDEAE对PCC的吸附洗脱性能表明,该树脂可用于扩张床吸附分离PCC的工艺。

基于FPGA的DDS IP核的研究与设计

针对传统的用单片机和DDS芯片设计高频信号发生器的方法具有的硬件结构复杂、人机交互性差和低可移植性等问题,提出了一种实现高频信号发生器功能的直接数字频率合成器(DDS)IP软核的设计方法.本设计首先通过加权的方法实现十进制向二进制的转换,提高IP核的人机交互性,并引入streamlined算法在FPGA上实现频率控制字产生单元,解决传统设计中硬件结构复杂的问题.然后,在ISE设计平台上采用Verilog HDL硬件描述语言进行DDS行为描述,连接频率控制字产生单元,实现一个可重载的DDS IP软核.最后,在XILINX SEEDXDTK V5实验平台上对IP核进行板级验证.验证结果表明,此IP核具有良好的人机交互性和可移植性,能够很好的满足实际应用.

Streamline DEAE对蛋白酶复合物的吸附平衡研究

以人凝血酶原复合物(以下简称PCC)为目标产物,研究了扩张床用离子交换树脂Streamline DEAE对蛋白酶复合物的吸附平衡。测定了不同温度下的吸附等温线和吸附动力学曲线,并通过计算求得热力学和动力学参数。结果表明:Streamline DEAE对PCC的吸附符合Langmuir模型,吸附反应的焓热变为34.466 kJ/mol;吸附动力学曲线用拟二级速率方程拟和有着较好的吻合度。吸附过程中蛋白质分子在树脂颗粒内部的扩散为控制步骤,求得吸附反应的表观活化能为29.089 kJ/mol,表明此Streamline DEAE对PCC的吸附具有反应速率快,性能稳定等特点。

扩张床用离子交换树脂对人凝血酶原复合物的吸附平衡研究

研究了扩张床用离子交换树脂（Streamline DEAE）对人凝血酶原复合物（PCC）的吸附平衡，测定了不同温度下的吸附等温线和吸附动力学曲线，并通过计算求得热力学和动力学参数。结果表明：Streamline DEAE对PCC的吸附符合Langmuir模型，吸附反应的焓热变为34．466kJ／mol，吸附动力学曲线用拟二级速率方程拟合有着较好的吻合度；吸附过程中蛋白质分子在树脂颗粒内部的扩散为控制步骤，吸附反应的表观活化能为29．089kJ／mol。表明Streamline DEAE对PCC的吸附具有速率快、性能稳定等特点。

格调&自豪 斯堪尼亚全新Streamline系列登陆中国

2013年11月22日,斯堪尼亚揭开专为中国市场精心配置的全新Streamline长途运输车系列的神秘面纱,树立了燃油经济性新标准。之前斯堪尼亚推出的欧3系列堪称节能方面的市场领先产品,而与之相比,斯堪尼亚全新Streamline可将燃油经济性提高达7%。燃油经济性的改进甚至将车用尿素成本考虑在内,同时,废气排放水平符合欧4排放标准。彰显王者风范的Highline驾驶室,符合空气动力学的流线型设计,外观时尚、内部空间宽敞舒适。据悉,全新Streamline系列将于2014年初在中国正式上市。

斯堪尼亚将免费提供十年车队管理系统监测报告

自2014年春天斯堪尼亚全新Streamline系列在中国上市以来，所有售出的卡车上均已预装斯堪尼亚车队管理系统装置。现在，所有必要证明和许可证均已齐全，斯堪尼亚已激活了该系统。这意味着所有使用斯堪尼亚全新Streamline系列车辆的客户均可免费通过电子邮件获得监测报告，从中了解车辆与上一时段相比的表现情况。

斯堪尼亚高端卡车助力高效物流 访义乌诚信物流总经理傅海明

5月20日，斯堪尼亚在国内销售的两台最大马力物流牵引车R560 Streamline在广州直营店顺利交付客户，订购该车的是义乌诚信物流的总经理傅海明。此次采购斯堪尼亚在中旧销售的顶级车型，诚信物流是出于怎样的考虑，又是什么原因让诚信物流与斯堪尼亚结下了不解之缘呢？

斯坦尼亚交付深圳18台重卡

1月19日，斯堪尼亚深圳成功交付18台斯堪尼亚全新Streamline重卡。18台卡车订单分别来自深圳陆源物流有限公司和深圳世恒达物流有限公司。深圳市陆源物流有限公司提供整车级干线零担运输服务，已在国内百余个城市建立了客户服务网络，正处于高速发展阶段。此次订购了10台斯堪尼亚全新Streamline，全部用于承担深圳至乌鲁木齐的快件专线运输任务。