摘要：A polymeric hydroxyl ferric phosphate(PHFP)was prepared by using a byproduct of titanium dioxide containing ferrous sulfate and phosphates under alkaline *** PHFP was used to immobilize lead(Pb)and cadmium(Cd)in *** transform infrared spectra,X-ray diffraction were applied to revealing the characteristics of PHFP,and the modified Tessier sequential extraction and column leaching experiment with simulated acid rain were used to assess the effectiveness of immobilization of Cd and Pb in soils by *** results showed that PHFP was indeed a polymer with complicated OH-Fe-P structure and consisted of Fe6(OH)5(H2O)4(PO4)4(H2O)2and Fe25(PO4)14(OH)***,the removal rates of DTPA-extractable Cd and Pb in soils reached up to33%and45%,and the water-soluble Cd and Pb decreased by56%and58%,respectively,when PHFP was added in soils at4%*** addition,the immobilization of Cd and Pb contributed to transforming water soluble,exchangeable and carbonate-bonded fractions to Fe and Mn oxides-bonded,organic-bonded and residual *** leaching with simulated acid rain,Cd and Pb release amount in PHFP amended soil declined by53%and52%,respectively,as compared with non-treated *** result implied that PHFP had a potential application for the remediation of Cd-and Pb-contaminated soils.

摘要：Morphology,distribution,composition,forming ability,structural stability and intrinsic mechanical properties of the intermetallic compounds(IMCs)formed in steel/aluminum laser welding were determined through scanning electron microscope,energy dispersive spectrometer,X-ray diffractometer and first-principles *** was found that the mechanical properties of the joint are limited by the Fe−Al IMCs,whose brittleness is attributed to the orbital hybridization between Al(s),Al(p)and Fe(d).However,the joint properties are improved by adding interlayer,which is ascribed to some changes of electronic structure of the generated *** transition mechanism of IMCs changing from brittle to ductile is mainly due to the weak ability of interlayer elements to attract *** mechanical properties of the joint are closely related to the ductility or brittleness of the ***,the addition of Ti foil interlayer effectively improves the mechanical properties of the joints,which means that the experimental verification is in good agreement with the theoretical calculation predictions.

摘要：模拟并设计了一种基于表面微机械加工的平面MEM电感,提出了它的等效电路模型并给出模型中参数的提取方法。由模拟结果验证了该等效电路具有较高的精度,误差在8%以内。设计的一个3.6nH的平面MEM电感的品质因数超过20,自谐振频率超过15GHz。由平面MEM电感构成的5阶LC低通滤波器的-3dB带宽为3.7GHz,0-3GHz内的插入损耗低于1dB。

摘要：The structure of multiphase flow helico-axial pump＇s rotor and how to model the rotor, especially the blades of the rotor, based on the Solidworks software. More important, the principle of the blade design is mainly introduced. Under the guide of the principle, the 3D coordinates of the blade data points can be got by matlab programming. In the paper, the design step and the modeling step are particularly described through a concrete example.

摘要：为满足医学上多孔植入体的力学性能和生物相容性要求,研究一种利用Voronoi-Tessellation算法生成可控多孔结构的参数化设计方法。分析了以孔棱直径、不规则度及单元距离为结构参数,以弹性模量、抗压强度及孔隙率为响应目标的Box-Behnken设计。结合灰色关联分析,得到多响应目标的最佳结构参数,并建立了灰色关联度预测模型,通过方差分析验证了模型的准确性。结果表明,孔棱直径是影响多孔结构性能最显著的因素。不规则多孔结构的最佳结构参数为孔棱直径0.3 mm,不规则度0.5,单元距离2 mm。得到不规则多孔结构的弹性模量为2.987 GPa,抗压强度为210.048 MPa,孔隙率为89.43%,灰色关联度为0.7895,优化结果与预测结果的符合程度高,误差为1.2%,表明该优化方法切实可行。

摘要：介绍了直动式交流接触器智能设计系统的开发。系统是基于Pro/Engineer系统的二次开发,以Pro/Engineer提供的二次开发工具Pro/TOOLKIT和MFC为工具,在VC环境下,使用DLL动态连接库技术,将Pro/Engineer、Pro/TOOLKIT和MFC集成在一起。使用了ADO对数据库进行访问和操作。

摘要：利用电阻型FSS吸波材料结构,结合粒子群算法优化设计了一种宽频带低剖面的微波吸波材料。通过设计不同的自适应度函数,探讨了优化策略对吸波材料设计结果的影响。在综合平衡宽带和低剖面的条件下,设计出的吸波材料,其-10d B带宽达到6.25~25.30GHz,而厚度仅为3.92mm。对设计结果进行了实验验证,结果证明了粒子群优化算法设计的有效性。所采用的计算流程可以全程自动进行优化处理。

摘要：本文研究了旋磁铁氧体材料在不同条件下(磁化状态,大块材料和离散的阵列形式)对低频电磁波的吸收性能以及铁氧体基元间的耦合作用对吸收带宽的影响.研究结果表明,通过旋磁铁氧体在吸波材料中的结构设计可以实现对低频电磁波的高效吸收.文中4 mm大块薄层旋磁铁氧体反射率的–10 d B频点能低至0.48 GHz,并可以通过调整偏置磁场的大小或者离散铁氧体基元的大小灵活地改变共振频率.引入不同尺寸的基元形成的多谐振峰及其相互的耦合可以有效拓展–10 d B带宽,并且这种展宽作用在不同的磁化状态下都是有效的.当采用横向偏置场700 Oe时,两基元吸波材料–10 d B带宽可达单个基元各自作用带宽之和的105.7%.

摘要：设计了一种简洁的角度扫描棱镜SPR传感系统,反射式平行光路设计简化了系统结构。其主要包括光源及光强感知、平行光路结构、电机与温度控制模块构成。通过单电机扫描入射角与温度控制,实现了对葡萄糖的折射率浓度特性有效测量。理论分析存在交叉灵敏度矩阵可同时度量温度及葡萄糖质量浓度共振角度的变化规律,且实验得其灵敏矩阵。为区分温度和质量浓度对共振角度的影响以及校正SPR温度漂移提供参考。

摘要：为解决产品自顶向下设计过程中设计参数完全受控于顶层骨架模型的局限性和设计单元重用时导致参照关系混乱的现象,提出以多骨架模型对设计信息进行分类管理和分层控制的自顶向下设计方法。首先根据骨架模型包含的参数和在设计过程中实现的功能定义定位骨架、信息传递骨架和设计骨架的概念;然后介绍分层递阶的多骨架建模方法。以Pro/E为设计平台,结合自卸车产品设计实例,验证了该方法的可行性和有效性。