Generalized formulation is developed analytically to calculate the transmission loss performance of a silencer by using multiple micro-perforate panel (MPP) array silencers in ventilation duct system. The device, based on single MPP design, consists of different expansion chambers with the side-branch cavities covered by micro-perforate panels of different properties. The theoretical model can ...

This paper uses micro data from the German Socio-Economic Panel to document that the wage structure in West Germany was remarkably stable over the period 1984–97, with little variation over time in wage or earnings inequality among and within different skill groups. The paper investigates a number of possible explanations for the stability of the wage structure and concludes that it is attribut...

It is well-known that nonresponse affects the results of surveys and can even cause bias due to selectivities if it cannot be regarded as missing at random. In contrast to household surveys , response behaviour in business surveys has been examined rarely in the literature. This paper is one of the first which analyses a large business survey on micro data level for unit nonresponse. The data b...

INTRODUCTION Systemic steroids have been associated with anergy. Treatment with high-dose inhaled steroids has many documented systemic side effects, including adrenal suppression, reduction in growth velocity, and increased bone metabolism; however, little is known about their effect on delayed-type hypersensitivity (DTH). STUDY OBJECTIVES The purpose of this study was to determine if a 28-d...

This paper presents a data gathering for Advanced Process Control (APC) in FA (Factory Automation). It is important that the gathered data in FA to control all the processing, to be a predictive maintenance of equipments and manage products. We gathered the entire data of all in FA through Equipment Engineering System (EES) and analyzed that to control a processing, predict the next processing ...

The objective of this paper is to estimate the impacts of long-and mediumterm duration in micro…nance program participation. It utilises a new, large and unique household-level panel dataset collected on 1997/98 treatment and control households, spanning about 8 years. The data enables us to identify continuing participants in the program as well as newcomers and leavers. We employ di¤erent est...