Freeze–thaw cycles under the conditions of snowmelt and rainfall infiltration in winter are triggers for petroglyph weathering. Rock samples from Helan Mountains were subjected freeze–thaw various laboratory testing, mass, elastic wave velocity unconfined compressive strength tested. The results show that mass loss rate, decreased. In addition, according to XRD analyses, content calcite feldspa...

An unusual case of group B streptococcal meningitis in an adult is described. The evidence presented suggests that early vascular involvement during the meningitic process resulted in cerebral infarction, thereby explaining the patient's sudden deterioration and atypical presentation.

The correction of exogenous and endogenous environmental insult to DNA involves a series of DNA repair mechanisms that reduce the likelihood of mutation accumulation and hence an increased probability of tumour development. The mechanisms underlying the process of base excision repair are relatively well understood and are placed in context with how deterioration of this process is associated w...

The paper addresses the problem of maximizing the percentage of on-time jobs in a parallel machine environment with sequence dependent deterioration. The deterioration of each machine (and therefore of the job processing times) is a function of the sequence of jobs that have been processed by the machine. Two machine loading strategies are combined with a set of list scheduling algorithms to so...

A condition based preventive and corrective maintenance policy is proposed for a continuously operating system. The condition of the system is assumed to deteriorate with time. The model incorporates both deterioration as well as random common cause failures. The deterioration stages are modeled as discrete state processes. The system is put to random inspection to know the condition. The mean ...

The effective planning for the renewal of water distribution systems requires accurate quantification of the structural deterioration of water mains. Direct inspection of all water mains in a distribution system is almost always prohibitively expensive. Identifying water main breakage patterns over time is an effective and inexpensive alternative to gauge the structural deterioration of a water...