Dynamic substructure model for multiple impact responses of micro/nano piezoelectric precision drive system

A dynamic substructure technique which considers the electromechanical coupling effect of the PZT and the inertial effect of flexible components is presented to study the multiple impact dynamic behavior of micro/nano piezoelectric impact drive systems.It can investigate the step-like motion of object body and the multiple impacts behaviors reasonably by the comparison of the experimental data and the numerical solution of the spring-mass model.It is expected to have higher accuracy in the numerical simulat...     

A simplified method for isocratic HPLC analysis of polyamines

Summary A simple technique is described for the separation and analysis of polyamines in tissues and body fluids, utilizing precolumn clean-up on disposable CM-cellulose columns, followed by an automatable HPLC procedure. Complete separation and analysis takes 12–15 min per sample with sensitivity in the pmole range.Acknowledgments. Supported by USPHS HD-09713, EPA R811621010 and by Research Scientist Development Award DA-00006 to TAS.     

A new method of scenario analysis for strategic planning

We first present scenario analysis as a qualitative forecasting technique useful for strategic planning. Then we develop an overview of the two classes of methods for scenario analysis described in the literature. Based on both classes, a new method is developed which especially fits the needs of strategic planning. The method can be divided into three stages: 1. Determination of compatible scenarios, 2. Determination of scenario probabilities, and 3. Determination of main scenarios. An example is given to illustrate the method.     

The imperative for inclusion: A gender analysis of genetics

It has now been more than thirty years since Joan Wallach Scott (1986) argued that gender is a legitimate and necessary category of historical analysis that applies to all fields, including genetics. In the intervening years, a substantial body of work has appeared that adds women to the historiography of genetics. While this is a necessary component for including gender as a category of analysis in genetics, it is not sufficient. Gender analysis involves the broader goal of integrating gender into the interrogation of how social factors within research practices and institutional organization influence scientific work and knowledge production in genetics. This article argues for the imperative for inclusion—including both women and gender analysis—which, taken together, not only provide a more equitable and informative picture of the discipline's development, but also yield a historiography that more faithfully reflects the activity of doing science.