Large deformations of thin-walled circular tubes under transverse loading—III: Further experiments on the bending of simply supported tubes

Further experimental results are presented concerning the transverse loading of simply supported tubes supplementing those given in ref. (1). Surface stresses are examined by means of the brittle laquer technique and strain gauges. The influence of the geometrical parameters on the modes of deformation of the tubes is discussed in general terms.     

Behaviour modification

The first part of the article outlines how behaviour, both normal and 'abnormal', is a learned phenomenon and briefly looks at the various contingencies of learning that determine which behaviours develop. Many types of psychological disorder can be accounted for by such an approach, and several examples of how behavioural disorders develop are outoined. Finally, a rationale for treating certain types of these behavioural disorders is presented.     

The common diarrhoeas of sheep in Britain

As every sheep farmer knows, diarrhoea is of common occurrence in animals of all ages in his flock. In lambs it can result in sigificant mortality while in older animals growth rates are reduced and weight loss can occur. Although diarrhoea can be an incidental finding in many sheep diseases, particularly in their terminal stages, only on those conditions are commented on in which diarrhoea is the predominant feature of the clinical syndrome. The subject is discussed below on both an age and seasonal basis and, if an initial assumption is made that lambing takes place at the traditional March/April period, animals will be increasing in age as the seasons progress. Thus the sequence commences in the spring with the young lamb and concludes the following winter with the adult.     

Resonance transition radiation X-ray lasers

A free electron laser is proposed using a periodic dielectric and helical magnetic field. Periodic synchronism between the electrons and the optical wave is obtained at the period of the dielectric and not at the period of the helical magnetic field. The synchronism condition and the gain of the new device are derived. The effects on the gain of the new device are derived. The effects on the gain from dephasing and beam expansion due to elastic scattering of the electrons in the periodic medium are included in the gain calculation. Examples of the resonance transition radiation laser and klystron are given. Operation at photon energies between 2.5 and 3.5 keV with net gain up to 12% is feasible using high electron-beam energies of 3 and 5 GeV. Moderate (300-MeV) beam energy allows operation between 80 to 110 eV with up to 57% net gain using a klystron design. In both cases, rapid foil heating may limit operation to a single electron-beam pulse     

Internal Nucleation of Highly Undercooled Magnesium Metasilicate Melts

Crystallization and vitrification in undercooled, fine magnesium silicate droplets, with compositions ranging from 34.5 ≤ wt% MgO ≤ 39.9, were examined following containerless drop tube processing. From an initial phase assemblage of a mixture of the metasilicate (MgSiO₃) polymorphs orthoenstatite and clinoenstatite, three morphological powder types were observed following processing: unmelted shards, glass spheres, and melted/recrystallized spheres. The primary phase in the powders processed at a maximum temperature of ∼1650°C is the high-temperature metasilicate polymorph protoenstatite, with metastable forsterite (Mg₂SiO₄) also appearing. The melted/recrystallized spheres have the uniform, submicrometer texture of a glass ceramic, decisively different from the surface crystallization textures normally seen for melts/glasses of these compositions. Transmission electron microscopy results indicate that the glass-ceramic texture occurs because the process technique allows a liquid-phase immiscibility to precede crystallization. The phases and textures developed during containerless solidification processing of these metsilicate compositions are analyzed thermodynamically; the minimum amount of undercooling required for amorphous phase separation is evaluated using the metastable extensions of the forsterite + liquid and the silica-rich, twoliquid miscibility phase boundaries. The application of metastable phase diagram analysis is demonstrated as an effective guide for identifying potential compositions for development of novel glass-ceramics.     

Identification of glycoproteins in goblet cells of epidermis and gill of plaice (Pleuronectes platessa L.), flounder (Platichthys flesus (L.)) and rainbow trout (Salmo gairdneri Richardson)

A quantitative analysis has been made of the glycoproteins present in the goblet cells of the epidermis, gill filaments and gill lamellae of three species of teleost fish. The glycoproteins have been identified by a combination of techniques, including the use of the enzyme sialidase followed by Alcian Blue staining, at PH 2.6 or 1.0, in combination with periodic acid-Schiff. The selected fish were representative of species living in marine, freshwater and estuarine environments. The range of glycoproteins identified in these fish was similar to that found in mammalian tissue in that both neutral and acid glycoproteins were present, the latter included both sialomucins sensitive and resistant to sialidase, and sulphomucin. A single goblet cell contained either neutral or acid glycoproteins alone or in combination. Only the epidermis of the plaice and rainbow trout contained uniform cell populations producing acid glycoproteins, the former sulphomucin and the latter mainly sialomucin. At each site in the flounder and in the gill epithelia of the plaice and rainbow trout, the goblet cell population was mixed, with cells producing each type of glycoprotein. The number of goblet cells producing each type of glycoprotein varied at each tissue site.     

An algorithm for tracking multiple targets

An algorithm for tracking multiple targets in a cluttered enviroment is developed. The algorithm is capable of initiating tracks, accounting for false or missing reports, and processing sets of dependent reports. As each measurement is received, probabilities are calculated for the hypotheses that the measurement came from previously known targets in a target file, or from a new target, or that the measurement is false. Target states are estimated from each such data-association hypothesis using a Kalman filter. As more measurements are received, the probabilities of joint hypotheses are calculated recursively using all available information such as density of unknown targets, density of false targets, probability of detection, and location uncertainty. This branching technique allows correlation of a measurement with its source based on subsequent, as well as previous, data. To keep the number of hypotheses reasonable, unlikely hypotheses are eliminated and hypotheses with similar target estimates are combined. To minimize computational requirements, the entire set of targets and measurements is divided into clusters that are solved independently. In an illustrative example of aircraft tracking, the algorithm successfully tracks targets over a wide range of conditions.     

CLSS: An Intelligent Crane Lorry Scheduling System

Companies that provide crane-lorry services are faced with the daily need to perform vehicle and driver allocation and scheduling. Many companies still do this manually due to the lack of suitable technologies. This manual approach is both time consuming and inaccurate and most probably will not lead to an optimized plan that can reduce operational costs. In this paper, we describe the design of a system called Crane Lorry Scheduling System (CLSS) that we have developed for the largest crane lorry company in Hong Kong. A crane lorry company is a company that provides lorries with different types of mounted crane equipment and drivers to service different types of moving and lifting jobs. CLSS is a Web-based application that streamlines communication with customers, subcontractors and employees/lorry drivers. We modeled the lorry-assignment problem as a constraint-satisfaction problem (CSP) algorithm, which we call the Crane Lorry Optimizing Engine (CLOE). CLOE was designed to be easily customizable to match the needs and requirements of different crane lorry companies. We experimented with two versions of CLOE, regular CLOE that finds best solutions and X-CLOE that finds optimal solutions. Results from our tests show that CLOE is faster and generates better quality plans than the manual approach.