摘要：Both batch-to-batch(B2 B)and roll-to-roll(R2 R)processes can be used for mass production of graphene *** of the simplicity of equipment,the B2 B process is more commonly used in laboratory *** contrast,the R2 R process is more industrially preferred because it is easier to automate and more compatible with the subsequent transfer *** to now,the research on R2 R process has mainly focused on the design of the reactor or the loading configuration,but the in-depth understanding on the growth kinetics is *** this paper,we investigated the evolution of graphene growth and revealed that the graphene domain density grown by the R2 R process was larger than that by the B2 B process with the same reaction parameters,which was attributed to different reaction profiles between the two ***,the defective graphene could be healed with elongated reaction *** the optimized R2 R process,graphene films with quality comparable to those grown by conventional B2 B process could be *** research will promote the development of the mass-production technique for graphene films.

摘要：Forward modeling is the basis of inversion imaging and quantitative interpretation for DC resistivity ***,a numerical model of the DC resistivity method must be finely divided to obtain a highly accurate solution under complex conditions,resulting in a long calculation time and large ***,we propose a 3D numerical simulation method in a mixed space-wavenumber domain to overcome this *** partial differential equation about abnormal potential is transformed into many independent ordinary differential equations with different wavenumbers using a 2D Fourier transform along the x axis and y axis *** this way,a large-scale 3D numerical simulation problem is decomposed into several 1D numerical simulation problems,which significantly reduces the computational and storage *** addition,these ordinary 1D differential equations with different wavenumbers are independent of each other and high parallelelism of the *** are solved using a finite-element algorithm combined with a chasing method,and the obtained solution is modified using a contraction *** this method,the vertical direction is reserved as the spatial domain,then grid size can be determined flexibly based on the underground current density distribution,which considers the solution accuracy and calculation *** addition,for the first time,we use the contraction operator in the integral equation method to iterate the *** algorithm takes advantage of the high efficiency of the standard Fourier transform and chasing method,as well as the fast convergence of the contraction *** verified the accuracy of the algorithm and the convergence of the contraction *** with a volume integral method and goal-oriented adaptive finite-element method,the proposed algorithm has lower memory requirements and high computational efficiency,making it suitable for calculating a model with large-scale ***,differ

摘要：基于127μm的高纯度石英(99.9997%)基底设计了共面波导(CPW)、微带环形谐振器(MRR)结构,通过测试得到在40~110 GHz的频率范围内,CPW线的平均插入损耗在0.096~0.176 dB/mm之间。此外,采用MRR方法提取了石英的相对介电常数和损耗角正切值,该石英基底在V波段和W波段的相对介电常数分别介于3.7~3.85和3.85~4之间,损耗角正切值在V波段约为0.004,在W波段介于0.004~0.006之间。通过与其他基底性能对比表明,该高纯度石英具有良好稳定的电性能,其在设计高性能无源和封装结构方面具有一定的潜力。

摘要：Magnetic field gradient tensor technique provides abundant data for delicate inversion of subsurface magnetic susceptibility distribution. Large scale magnetic data inversion imaging requires high speed and accuracy for forward modeling. For arbitrarily distributed susceptibility data on an undulated surface, we propose a fast 3D forward modeling method in the wavenumber domain based on(1) the wavenumber-domain expression of the prism combination model and the Gauss–FFT algorithm and(2) cubic spline interpolation. We apply the proposed 3D forward modeling method to synthetic data and use weighting coefficients in the wavenumber domain to improve the modeling for multiple observation surfaces, and also demonstrate the accuracy and efficiency of the proposed method.

摘要：为获得正交胶合木(CLT)截面的综合抗压性能,对由云杉-松-冷杉(SPF)制成的CLT试件进行抗压试验,并基于复合层板理论计算CLT的抗压强度、泊松比及弹性模量等,旨在为CLT力学性能测试提供参考。制作了9个尺寸相同的CLT试件进行轴心受压试验,分析其极限承载力、纵向应变、横向应变、泊松比等的变化规律;依据《木结构设计标准》预测试件的理论承载力并辅以有限元验证。结果表明:荷载-轴向位移试验曲线呈典型的二折线特征,轴压力下试件分别经历了弹性和弹塑性阶段直至试件破坏;经换算得到的SPF等效弹性模量为10011.57 MPa,抗压强度为35.16 MPa,泊松比为0.39,理论计算值与试验值较为吻合;弹性段有限元模拟结果与试验值吻合良好。

摘要：对AOAO工艺处理焦化废水性能进行了系统研究。结果表明,AOAO工艺具有良好的脱氮和COD降解能力,尤其对有毒污染物能高效降解,使AOAO出水中的挥发酚、氰化物、多环芳烃等污染物浓度显著降低。微生物群落组成分析表明,在生物反应器中,变形菌门占绝对主导地位,其次是拟杆菌门。各反应器操作特性对微生物群落演替有明显的影响,Diaphorobacter和Acidovorax在一级AO中占优,Hyphomicrobium和Nitrospira在二级AO中富集,二级AO反应器中细菌群落丰富度升高而多样性降低。本研究对AOAO工艺性能及微生物变化的深入解析,将有助于制定有效的焦化废水处理策略。

摘要：本研究以符合一室和两室模型特征的奥卡西平和他克莫司为典型药物，采用蒙特卡洛法模拟服药后的稳态谷浓度，且均用一室模型拟合，考察不同多谷浓度采样方案（每名受试者采集1～4个谷浓度）和NONMEM软件中的不同算法对群体和个体药动学参数估算的影响。结果表明：表观清除率（CL／F）估算的准确度和精密度优于其他参数。对于奥卡西平，增加每名受试者的谷浓度采样次数，所有参数估算的准确度和精密度均有改善。对于他克莫司，随着采样增加，CL／F与其个体间变异的估算更稳定，残差变异估算也更可靠，但前者的估算准确度无改善。算法中蒙特卡洛重要抽样法（IMP）和基于后验估计的IMP法（IMPMAP）较稳定可靠。个体参数的估算仅与算法中是否含个体间变异和残差变异的交互作用有关。随着变异水平减小，群体或个体参数估算的准确度和精密度均有改善，且残差变异的影响大于个体间变异。上述结果可为基于谷浓度的群体药动学研究提供参考。

摘要：针对低压差分信号驱动电路对共模电压和参考电流的需求,提出了一种新型带隙基准源结构,可在一个基准模块内同时提供带隙基准电压和基准电流.对传统带隙基准进行了改进,优化了基准电压和基准电流的温度特性.仿真结果显示,所设计的基准源电路具有较好的温度特性,在温度范围为-40℃~125℃时,基准电压的温漂系数为17.4 ppm/℃,电流基准的温漂系数为63.3 ppm/℃.作为参考电压与电流基准,可有效保证LVDS信号的稳定性.

摘要：过江隧道隧址断面河床冲刷深度直接关系到工程规划的经济性和工程运行的安全性,因此合理预测河床冲刷深度至关重要。在国内外学者研究成果的基础上,以重庆长江过江隧道为例,根据三峡变动回水区近期水沙资料及水库运行资料分析工程河段河床演变及隧址断面冲淤变化,采用多种常用的冲刷计算公式对不利水文条件下隧址断面的河床冲刷深度进行预测。结果表明,确定过江隧道隧址断面河床冲刷深度为4. 8 m。研究成果可为类似工程提供参考。

摘要：文章采用有限元对单桩极限承载力静载试验进行分析;该方法采用Drucker-Prager模型确定土体本构关系,在桩土之间设置Goodman接触单元;结合合肥地区的工程实例,利用GTS有限元分析工具,建立有限元模型,进行了基桩静载试验的数值模拟。结果表明,通过合理地设定计算参数,基桩静载试验的Q-s曲线实测值和计算值吻合较好。分析结果对于深刻理解桩土相互作用的机理有重要的意义,为确定单桩极限承载力开辟了新的思路。