Modelling Complex Series Combinations of Draft Gear Springs

Author(s):  
Colin Cole ◽  
Maksym Spiryagin ◽  
Qing Wu
Keyword(s):  
1984 ◽  
Vol 11 (1) ◽  
pp. 61-73 ◽  
Author(s):  
S P Carter ◽  
D Haigh ◽  
N R J Neil ◽  
Beverley Smith

Summary Excavations at Howe revealed a complex series of settlements which spanned the whole of the Iron Age period and were preceded by two phases of Neolithic activity. A probable stalled cairn was succeeded by a Maes Howe type chambered tomb which was later followed by enclosed settlements of which only scant remains survived. These settlements were replaced by a roundhouse with earth-house, built into the ruins of the chambered tomb. The roundhouse was surrounded by a contemporary defended settlement. Rebuilding led to the development of a broch structure and village. Partial collapse of tower brought about changes in the settlement, andalthougk some houses were maintained as domestic structures, others were rebuilt as iron-working sheds. The construction of smaller buildings and a later Iron Age or Pictish extended farmstead into rubble collapse accompanied a decline in the size of the settlement. The abandonment of the farmstead marked the end of Howe as a settlement site.


2019 ◽  
Vol 13 (1-2) ◽  
pp. 155-181 ◽  
Author(s):  
Richard Tuffin ◽  
Martin Gibbs

For over half-a-century (1803–54), the Australian colony of Van Diemen's Land (Tasmania), played a key part in Britain's globe-spanning unfree diaspora. Today, a rich built and archaeological landscape, augmented by an exhaustive and relatively intact documentary archive, stand as eloquent markers to this convict legacy. As historical archaeologists, we have spent countless hours querying the physical and documentary residues in a bid to understand how the penological, social and economic imperatives of Britain and the colony shaped the management of convict labour. In particular, our task has centred upon the recovery of individual narratives – of both gaoler and gaoled – from such residues, moving away from a traditional focus on the broader outlines of the convict system. This paper illustrates how spatial history methodological processes have been used to relocate individual historic lives back into the convict industrial landscape of the Tasman Peninsula (Tasmania). Focusing on the male-only penal station of Port Arthur (1830–77), we will illustrate how we have reunited the physicality of past spaces and places, with the lives and labours of those who created and navigated them. Simple methodologies have been used to achieve this, designed with onward applicability in mind. A complex series of documents, convict conduct records, have been mined for spatial markers, allowing events and people to be relocated back into space. Through these processes of linkage and visualisation, we have been encouraged to ask further questions about the management of the unfree labour force and how this came to create the landscape we see today.


2020 ◽  
Vol 21 (15) ◽  
pp. 1558-1565
Author(s):  
Matteo Santoni ◽  
Francesco Massari ◽  
Liang Cheng ◽  
Alessia Cimadamore ◽  
Marina Scarpelli ◽  
...  

The carcinogenesis of prostate cancer (PCa) results from a complex series of events. Chronic inflammation and infections are crucial in this context. Infiltrating M2 type macrophages, as well as neutrophils and T lymphocytes, contribute to PCa development, progression and response to therapy. The preliminary findings on the efficacy of immunotherapy in patients with PCa were not encouraging. However, a series of studies investigating anti-PD-L1 agents such as Atezolizumab, Avelumab and Durvalumab used alone or in combination with other immunotherapies, chemotherapy or locoregional approaches are in course in this tumor. In this review, we illustrate the role of immune cells and PD-L1 expression during PCa carcinogenesis and progression, with a focus on ongoing clinical trials on anti-PD-L1 agents in this context.


1998 ◽  
Vol 21 (1) ◽  
pp. 122-123 ◽  
Author(s):  
Deepthi Kamawar ◽  
David R. Olson

Three- to six-year-olds were given Heyes's proposed task and theory of mind tasks. Although they correlated, Heyes's was harder; only 50% of participants with a theory of mind reached a criterion of 75% correct. Because of the complex series of inferences involved in Heyes's task, it is possible that one could have a theory of mind and fail Heyes's version.


Author(s):  
Simon Wagner ◽  
Colin Cole ◽  
Maksym Spiryagin

AbstractRolling stock connection systems are key to running longer and heavier trains as they provide both the connections of vehicles and the damping, providing the longitudinal suspension of the train. This paper focuses on the evolution of both connection and stiffness damping systems. Focus is on freight rolling stock, but passenger draw gears are also examined. It was found that connection systems have evolved from the buff and chain system used in the pioneer railways of the 1800s to the modern auto-coupler connection systems that are in-service worldwide today. Refined versions of the buff and chain coupling are, however, still in use in the EU, UK, South America and India. A wide range of auto-coupler systems are currently utilised, but the AAR coupler (Janney coupler) remains the most popular. A further variation that persists is the SA3 coupler (improved Wilson coupler) which is an alternative auto-coupler design used mainly throughout the former Soviet Union. Restricting the review to auto-coupler systems allowed the paper to focus on draft gears which revealed polymer, polymer-friction, steel spring-friction, hydraulic draft gears and sliding sill cushioning systems. Along with the single compressive draft gear units balanced and floating plate configurations are also presented. Typical draft gear acceptance standards are presented along with modelling that was included to aid in presentation of the functional characteristics of draft gears.


2017 ◽  
Vol 218 (18) ◽  
pp. 1700192 ◽  
Author(s):  
Mohamad-Ali Tehfe ◽  
Marc Lepeltier ◽  
Frédéric Dumur ◽  
Didier Gigmes ◽  
Jean-Pierre Fouassier ◽  
...  

1970 ◽  
Vol 22 (3) ◽  
pp. 277-289
Author(s):  
B. Jasek
Keyword(s):  

It might be supposed that the discovery of a chemical element was a reason ably straightforward historical event which could be described in a few pages. Indeed in his biography of William Crookes (1), E. E. F. D ’Albe describes Crookes’s 1861 discovery o f thallium in just under six pages (2). Yet if we simply consider the science which was involved in Crookes’s work on thallium a complex series of events emerge. The presence of thallium had first to be detected, next a chemical process was undertaken to verify its elemental nature and finally a quantity of the pure element had to be isolated. In the 1860s there was no generally agreed definition of what constituted the discovery of a chemical element — detection, verification or isolation. But in the case of thallium individuals often argued strongly for one of these definitions. Such individual choices were not arbitrary, but were directed, as we shall see, towards serving their interests. To understand their choices, therefore, we cannot simply consider only the science, when discussing the discovery of thallium, but we also have to examine and define the context in which work on thallium was conducted.


Author(s):  
Donald W. Winnicott

In this essay, Winnicott states that the basis for a study of actual aggression must be a study of the roots of aggressive intention. The main source of aggression is instinctual experience. In the stage of what Winnicott calls Pre-Concern, aggression is a part of love. If it is lost at this stage of emotional development there is some degree of loss of the capacity to love; to make relationships with objects. During the Stage of Concern there are innocent aggressive impulses towards frustrating objects, and guilt-productive aggressive impulses towards good objects. With the phase he describes as the Growth of Inner World, the child becomes concerned with the effect on his mother of his impulses, and the results of his experiences in his own self. A complex series of defence mechanisms develops, which should be examined in any attempt to understand aggression in a child who has reached this stage. A state of what looks like delusional madness easily appears through the child’s projection of inner world experience out onto his objects. All being well through these stages, aggression then can come to have social value.


Author(s):  
Hongbin Xu ◽  
Jorge A. Prozzi

Aggregate morphology consists of three independent components: form, angularity, and surface texture. As these three components act in different ways in affecting the performance of pavement layer, it is vital to characterize them objectively and accurately. In this study, the coordinates of boundary pixels of aggregate from 2-D images were treated as an equally spaced complex series. The description of the aggregate shape in the frequency domain was obtained by analyzing this complex series with the discrete Fourier transform (DFT). Based on this, the reconstruction of aggregate shape at different frequencies was performed, which validated that the three elements of aggregate shape correspond to different frequencies. In addition, by fitting the relationship between DFT coefficients and form parameters (elongation ratio, sphericity, mean radius, variance of radius), the frequencies contributing to the form properties of aggregate were identified. Moreover, prediction models for the elongation ratio, sphericity, mean, and variance of radius based on the DFT coefficients at the contributing frequencies were developed separately.


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