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Parker, "Planetary gear parametric instability caused by mesh stiffness variation," Journal of Sound and Vibration, vol.
"Our annual survey aims to highlight potential areas of instability and help US policymakers anticipate contingencies that could be harmful to national interests.
Intuitively, having safety stock reduces schedule instability because it establishes a cushion against unexpected demand variations (Sridharanm 2007, Lin, Krajewski, Leong, & Benton, 1994).
Organised by the International Institute for Strategic Studies (IISS) at the Four Seasons Hotel Bahrain Bay, the two-day event brings together global decision-makers who will discuss economic development against the backdrop of regional instability under the theme Middle East: Regional Security and Business Opportunity.
In the work reported by this paper, we provided the instability probability function of roof blocks in exponential form through strict mathematical derivations starting from the assumption of instability probability of fractured roof blocks (Lin et al., 1987; Wang et al., 2011; Shen et al., 2011; Zhu, 2006), based on which instability conditions of fracture blocks were established and mechanism of complex mine pressure manifestation on work faces were revealed.
What they hear and read on political instability will have an impact on the economy."
Researchers now said that due to glacier instability, this rate may continue to accelerate and drive up sea level rise at a much faster pace than previously thought.  
He added: 'Pine-Island and Thwaites Glacier in the West of the Antarctic continent are increasingly losing ice for three decades already, and computer simulations support that we see a marine ice sheet instability happening here potentially leading to additional global sea-level rise of more than 3 meters.
In collaboration with Energy and Engineering Science Professor Christoph ME-ller's group at ETH Zurich, Boyce's team observed an unexpected Rayleigh-Taylor (R-T)-like instability in which lighter grains rise through heavier grains in the form of "fingers" and "granular bubbles." R-T instabilities, which are produced by the interactions of two fluids of different densities that do not mix -- oil and water, for example -- because the lighter fluid pushes aside the heavier one, have not been seen between two dry granular materials.
(2) Shoulder stability relies upon both static and dynamic stabilizers working in concert to simultaneously maximize range of motion while minimizing instability. (1) Static stabilizers include the capsule, labrum, articular cartilage, and negative intra-articular pressure; of particular importance is the anterior band of the inferior glenohumeral ligament and the anterio-inferior portion of the capsule, which provide restraint in the abducted and externally rotated position of apprehension.
'Kashmir is thus the casus belli between India and Pakistan and a major source of instability in the region.
Addressing at International Defence Exhibition and Seminar (IDEAS-2018) held at Karachi Expo Centre on the topic of 'Genesis of Instability in the Country and Region', the AJK president said conflict over Jammu and Kashmir between India and Pakistan remains the major cause of instability in the region, a media release issued here Wednesday evening by AJK Presidential Secretariat said.