نتایج جستجو برای: mean time to failure mttf
تعداد نتایج: 11000165 فیلتر نتایج به سال:
This investigation deals with the transient analysis of the machine repair system consisting of M-operating units operating under the care of single repairman. To improve the system reliability/availability, Y warm standby and S cold standby units are provided to replace the failed units. In case when all spares are being used, the failure of units occurs in degraded fashion. In such situation ...
Wireless sensor networks (WSNs) present several unique characteristics such as resource-constrained sensors, random deployment, and data-centric communication protocols. These characteristics pose unprecedented challenges in the area of query processing in WSNs. This dissertation presents the design and validation of adaptive fault tolerant QoS control algorithms with the objective to achieve t...
To increase reliability and fault tolerance in wireless sensor network, using spare nodes is a useful method. In this article, we survey the influence of using single-type and multi-type spare nodes on the fault tolerance in the low density. To achieve this, we use single-type and multi-type spare nodes and construct the network reliability graph for one, two and three-node densities. Then, we ...
An advanced safety architecture is the 2 out of 4-system (2oo4). In order to trigger the safety function at least two of the four channels must work correctly. It is said: “A 2oo4-system is 2-failure safe”. In order to classify the quality of a system we calculate different parameters. In the report equations are indicated for PFD for normal and common-cause-failures. Also the Markov-model for ...
Highly Accelerated Life Stress Testing (HALST) of Base-Metal Electrode Multilayer Ceramic Capacitors
An improved highly accelerated life stress test (HALST) procedure and modeling method was developed to evaluate the reliability of multilayer ceramic capacitors with base-metal electrodes (BMEs). Reliabilities of ceramic capacitors with precious-metal electrodes (PMEs) and BMEs are discussed. A combination of leakage current and mean-time-to-failure (MTTF) measurements under accelerated life st...
This paper tries to represent a new method for computing the reliability of a system which is arranged in series or parallel model. In this method we estimate life distribution function of whole structure using the asymptotic Extreme Value (EV) distribution of Type I, or Gumbel theory. We use EV distribution in minimal mode, for estimate the life distribution function of series structure and ma...
Improved performance and reliability of 9xx nm single emitter laser diodes are presented. To date, over 15,000 hours of accelerated multi-cell lifetest reliability data has been collected, with drive currents from 14A to 18A and junction temperatures ranging from 60C to 110C. Out of 208 devices, 14 failures have been observed so far. Using established accelerated lifetest analysis techniques,...
Electromigration of eutectic SnPb flip chip solder joints and their mean-time-to-failure ~MTTF! have been studied in the temperature range of 100 to 140 °C with current densities of 1.9 to 2.75 310 A/cm. In these joints, the under-bump-metallization ~UBM! on the chip side is a multilayer thin film of Al/Ni~V!/Cu, and the metallic bond-pad on the substrate side is a very thick, electroless Ni la...
from its emergence till present time marxist principles has undergone great changes since their promulgation by marx. many theorists and thinkers set at rectifying marxist tenets and introducing those of their own while others advocated its main concepts and attempted at improving them. among marxist philosophers who had an intensive study of marxs ideology, is louis althusser whose reflections...
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