精磨淬硬精密丝杠的原理误差对牙形的影响及其修正措施

淬硬精密丝杠的牙形精度取决于精磨。本文定量分析了精磨丝杠的原理性误差对工件牙形的影响程度,并以SG8650为例分析其磨后的牙形,进而提出了减少误差的措施。     

透皮给药系统的研究进展

介绍了透皮给药系统的特点、剂型、促渗技术和体内外研究模型,为透皮给药系统的研究提供参考。重点查阅了国外有关透皮给药系统的相关文献并进行分析总结。随着新材料、新技术、新设备的不断发展,促渗方法取得了很大的进步,透皮给药系统具有广阔的发展前景。     

Rapid fabrication and phase transition of Nd and Ce co-doped Gd2Zr2O7 ceramics by SPS

A series of Nd and Ce co-doped Gd_2-xNd_xZr_2-yCe_yO₇ (0.0 ≤ x, y ≤ 2.0) ceramics were rapidly fabricated through spark plasma sintering (SPS) within 3?min. The effects of Nd and Ce contents on the phase composition, lattice parameter, active modes, microtopography and microstructure have been investigated in detail. XRD studies reveal that the compositions corresponding to 0.0 ≤ y ≤ 1.0 show a single phase and beyond 1.0 exhibit multiphase. The lattice parameters increase with elevated Nd and Ce content. The grains are densely packed on each other with cube-like shape, and the elements are almost homogeneously distributed in the compound. This synthetic method provides a simple pathway for the preparation of highly densified single phase ceramic at 1600–1700 ℃ for 3?min under pressure of 80?MPa.     

浅析湿法磷酸脱氟反应原理

针对目前二水物法生产湿法磷酸存在的产品氟含量过高的问题,对湿法磷酸脱氟净化进行了研究。介绍了湿法磷酸中氟的存在形态,并对脱氟过程中常见的3种脱氟方法：化学沉淀脱氟、真空浓缩和汽提脱氟方法的反应原理和脱氟率影响因素进行了分析,据各种方法的反应原理,进一步探究影响脱氟率的因素。该研究对湿法磷酸的精加工具有重要意义,可以为解决深度脱氟净化工艺用于实际生产中出现的问题提供更广阔的思路。     

Simultaneous model selection and parameter estimation for lithium‐ion batteries: A sequential MINLP solution approach

Equivalent circuit model (ECM) is a practical and commonly used tool not only in state of charge (SOC) estimation but also in state of health (SOH) monitoring for lithium‐ion batteries (LIBs). The functional forms of circuit parameters with respect to SOC in ECM are usually empirical determined, which cannot guarantee to obtain a compact and simple model. A systematical solution framework for simultaneous functional form selection and parameter estimation is proposed. A bi‐objective mixed‐integer nonlinear programming (MINLP) model is first constructed. Two solution approaches, namely the explicit and implicit methods, are then developed to balance model accuracy and model complexity. The former explicitly treats the model complexity as a constraint and the latter implicitly embeds the model complexity into the objective as a penalty. Both approaches require sequential solution of the transformed MINLP model and an ideal and nadir ideal solutions‐based criterion is utilized to terminate the solution procedure for determining the optimal functional forms, in which ideal solution and nadir ideal solution represent the best and worst of each objective, respectively. Both explicit and implicit approaches are thoroughly evaluated and compared through experimental pulse current discharge test and hybrid pulse power characterization test of a commercial LIB. The fitting and prediction results illustrate that the proposed methods can effectively construct an optimal ECM with minimum complexity and prescribed precision requirement. It is thus indicated that the proposed MINLP‐based solution framework, which could automatically guide the optimal ECM construction procedure, can be greatly helpful to both SOC estimation and SOH monitoring for LIBs. © 2015 American Institute of Chemical Engineers AIChE J, 62: 78–89, 2016     

数据仓库技术及其在企业报表环境中的应用

简要介绍了数据仓库技术,着重分析了原有基于操作型系统在报表过程中存在的缺点。并提出了在数据仓库环境下对原有企业报表系统的改进方法。     

PID参数整定的MCP标准传递函数法公式

根据MCP标准函数,利用控制器标准传递函数设计方法推导得出了一种新的PID参数整定公式.通过理论分析和仿真试验,验证了用MCP法公式整定的系统具有超调量小和鲁棒性高的优点.     

特殊四边形面积公式的探讨

给出四类特殊四边形面积公式，对其中部分不常见公式进行简要证明。     

Review of MMPI-168 codebook.

Reviews the book, MMPI-168 codebook by Ken R. Vincent et al (1984). This book is an effort to present an actuarially devised system for use with the MMPI-168, a widely researched short form of the MMPI. It is an effort to move the MMPI-168 out of the category of screening instrument and into the area of a significant assessment instrument. The authors emphasize that the value in using the MMPI-168 and its complementary actuarial system will be its utility with patients having poor motivation, illiteracy, or physical disabilities. Psychologists using the MMPI-168 must be aware of several basic concerns, particularly those involved in research. For example, it is a different test from the MMPI, involving only the first 168 items, and it is normed on a nonrandomized sample of private psychiatric clinic patients. In examining the utility of brief assessment instruments, it would be of value to compare the utility of the MMPI-168 or other "short forms" to a validated structured interview procedure. There is no doubt that these types of assessment tools are needed in the field of rehabilitation psychology. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

How to Strip a Model to Its Essential Elements

Econometric models can be considered as a quantified representation of current economic theory. The paper suggests a procedure to check the correspondence between theory and practice. After an introduction about methodological aspects, a model of the Canadian economy is reduced by appropriate aggregation of the variables. Its condensed structure is then analysed, in order to investigate especially some noteworthy economic circuits such as financial flows and investment. The whole approach is strictly qualitative, based exclusively on the causal structure of the model. The results remain therefore consistent with any quantification of the model.