Measuring risky adolescent cycling behaviour

Adolescents are at a greater risk of being involved in traffic accidents than most other age groups, even before they start driving cars. This article aims to determine the factor structure of a self-report questionnaire measuring adolescent risky cycling behaviour, the ACBQ (Adolescent Cycling Behaviour Questionnaire). The questionnaire's structure was based on the widely used Driver Behaviour Questionnaire (DBQ). A sample of secondary school students (N?=?1749; age range: 13-18 years) filled out the questionnaire. Factor analysis revealed a three-factor structure underlying the questionnaire, which was confirmed on two equally large portions of the entire sample. These three underlying factors were identified as errors, common violations and exceptional violations. The ACBQ is a useful instrument for measuring adolescents' risky cycling behaviour.     

Measuring the cost of liquidity in agricultural futures markets: Conventional and Bayesian approaches

Estimating the cost of liquidity in agricultural futures markets is challenging because bid‐ask spreads are usually not observed. Based on an ability to reflect simulated data from Roll's spread model, we assess the effectiveness of conventional and Bayesian bid‐ask spread estimators under different market conditions. Conventional serial covariance and absolute price change spread estimators appear to be biased. Hasbrouck's Bayesian estimator generates small costs of liquidity whose values depend on the correlation and noise in the data. The absolute value Bayesian estimator is precise and works well under conditions of high levels of noise and correlation usually found in agricultural futures markets. Using data from live cattle (LC) and lean hog (LH) contracts, we find similar patterns of performance that produce economically meaningful cost of liquidity differences.     

Development of an inclined plate jet reactor system

A new design combines reaction or extraction and separation in one unit. Here are practical working details.     

Investigation of damage and repair of a 1000 MTD horizontal ammonia converter

An operational upset caused by a diapharagm failure in the high pressure casting of the synthesis gas compressor resulted in major pressure/flow surges in the synthesis loop.     

Correlation of acid gas-ethanolamine equilibrium using ionic concentrations

Experimental equilibrium measurements are modeled using a Davies-like ionic strength correction term for the reaction equilibrium constants. Calculated and experimental results are in much better agreement when the ionic strength correction terms are used.     

Commissioning of CIL's ammonia II plant

Special features of this process design contributed to fast start-up, including the role of the computer simulator for training purposes and the concept of commissioning by process test system.     

In-Kind Food Assistance and Consumer Food Choice

In-kind food assistance was the mainstay of federal food programs until the food stamp program expanded. Analysis of aggregate data suggests that large donations of cheese and butter since 1982, through the Temporary Emergency Food Assistance Program, replaced recipients’ normal purchases of the donated products, reduced consumption of close substitutes, and increased consumption of certain other protein foods. Programs of this type appear to have limited ability to enhance total demand for products in surplus.     

Measuring a Consumer Energy Conservation Ethic: An Analysis of Components

An energy future based on conservation will require that consumers subscribe to a Consumer Energy Conservation Ethic. This study identifies the components and best predictors of a conservation ethic.