324,104 research outputs found
Temperature, humidity and pressure measurement on automotive connectors
No full textEnvironmental testing under laboratory-controlled conditions has long been used to evaluate connector performance prior to practical application. There are a number of experimental procedures frequently used in the automotive industry such as the USCAR standard for automotive electrical connector systems to test connectors. However, recent research has shown that these tests appear to evaluate the mechanical stability of the connector housings and terminals, rather than their electrical performance. In order to establish more representative tests to evaluate the electrical performance of contacts, the actual environmental conditions at the contact interface, which are generally unknown, must be measured. This paper compares the temperature, humidity, and air pressure inside the connector housing to those measured outside. It was found that the conditions inside and outside the connector housing are different and a model relating the conditions is introduced
Degradation of road tested automotive connectors
No full textThe automotive environment is particularly demanding on connector performance, and is characterized by large temperature changes, high humidity and corrosive atmospheres. This paper presents an initial study of connector performance in terms of temperature profiles taken from road vehicles. The temperature profiles are then simulated using empirical relationships to allow prediction of connector performance. Wire harnesses have been investigated to seek evidence of the connector degradation predicted from the temperature data. Initial indications are that the wire harness shows the type of fretting behavior associated with the temperature changes. Evidence of fretting corrosion was found at the contact interface on tin plated terminals from sealed and unsealed connectors
Marcelo Caruso and Daniel Maul (eds.). Decolonization(s) and Education: New Polities and New Men
No full textReview: Marcelo Caruso and Daniel Maul (eds.). Decolonization(s) and Education: New Polities and New Men. Berlin: Peter Lang, 2020, 231 pp.</p
An Experimental Analysis of Railroad Spike Maul Methods
No full text This study investigated differences in railroad spike maul methods between experienced track workers and novice subjects. Differences were analyzed by developing a quantitative measure of the orientation of the spike maul path during spiking. The relationship between spiking motion pattern and spiking performance in both novice and experienced subjects was also investigated. Subjects were videotaped while using a spike maul on an instrumented spike force measuring system. Analysis of videotapes and performance measures revealed significant differences in motion patterns and performance between novice and experienced subjects. It was concluded from analysis of spike maul motion patterns that experienced track workers had developed a more efficient ballistic technique than had novices. This technique was evidenced by positioning of the maul close to the body's center of gravity, flexing the elbows, and using wrist motion on the downswing. </jats:p
Intermittency phenomena in electrical connectors
No full textFretting is known to be a major cause of contact deterioration and failure, particularly in tin-plated contacts. During fretting the contact resistance generally increases slowly with time. Superimposed on this slow increase in contact resistance are rapid changes in contact resistance within fractions of a second, called intermittences or short duration discontinuities. Although intermittences have been reported by several authors, they are frequently overlooked in traditional fretting experiments and not much is known about their origin. The present study aims at filling this gap. A test apparatus has been built to measure the contact voltage-drop profile during an intermittence and fretting experiments on tin-plated copper contacts have been carried out. The results lead to a set of requirements for a model to explain intermittency phenomena
Diplospinus multistriatus Maul 1948
No full textDiplospinus multistriatus Maul, 1948. Lined Cutlassfish or Striped Escolar. To about 33 cm (13 in) SL (Nakamura and Parin 1993). Circumglobal; western Pacific Ocean north to southern Japan (Nakabo in Nakabo 2002), and east of Kuril Islands (Savinykh et al. 2004); central California (35°N) (Ambrose in Moser 1996) to Chile (Pequeño 1989). Oceanic epipelagic and mesopelagic; depth: surface to 1,000 m (3,280 ft) (min.: Porteiro et al. 2017; max.: Clarke and Wagner 1976).Published as part of Love, Milton S., Bizzarro, Joseph J., Cornthwaite, Maria, Frable, Benjamin W. & Maslenikov, Katherine P., 2021, Checklist of marine and estuarine fishes from the Alaska-Yukon Border, Beaufort Sea, to Cabo San Lucas, Mexico, pp. 1-285 in Zootaxa 5053 (1) on page 209, DOI: 10.11646/zootaxa.5053.1.1, http://zenodo.org/record/557800
Displacement measurements at a connector contact interface employing a novel thick film sensor
No full textOne of the key failure mechanisms for wiring and connector
systems used in the automotive industry, is fretting and fretting
corrosion at the contact interface of connectors. For many
years, procedures have been carried out under laboratory controlled
conditions to investigate both thermal and vibration fretting
effects using environmental chambers and fretting tests. Both
optical and visual inspections have also been adopted to observe
the movement at the contact interface. However, these methods can
be considerably inconvenient and costly. Furthermore, their suitability
for field applications is limited. In order to study the fretting
degradation at the actual interface for in-situ measurement effectively,
a novel position sensor is designed to monitor the relative
displacement. Thick film techniques are employed to fabricate
miniaturized and cost effective resistive devices. The sensor is assembled
into a connector sample by taking the place of the male
component. When the interface experiences movement, the relative
displacement of the contact point would cause a corresponding
linear change of resistance measured across the male and female
connection. The sensors are validated by a series of experiments
and subsequently used in a field test to establish the relationships
between the fretting effects with temperature, humidity and differential
pressure, which is associated with temperature variation
Marcelo Caruso / Daniel Maul (Hrsg.): Decolonization(s) and Education. New Polities and New Men. Studies in the History of Education Vol. 5. Berlin: Peter Lang 2020 (238 S.) [Rezension]
No full textRezension von: Marcelo Caruso / Daniel Maul (Hrsg.). Decolonization(s) and Education. New Polities and New Men. Studies in the History of Education Vol. 5 Berlin: Peter Lang 2020 (238 S.; ISBN 978-3-631-67415-4; 64,95 EUR)
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