Dynamic resistivity

The ballistic bomb (pressure bomb, manometric bomb) is used to study the burn-up properties of a -> Gunpowder or -> Propellant charge powder. It consists of a pressure-resistant (dynamic loading up to about 1000 MPa (10000 bar) hollow steel body that can be bolted... 

Spider Mite/Dicofol System for Studying Resistance Dynamics... 

Dicofol resistance in spider mites, though of lesser practical importance in some agricultural systems than resistance to the organotin and organosulfur acaricides, provides a system conducive to the study of resistance dynamics. Resistance is generally manifest as a >1000-fold difference in susceptibility of resistant versus susceptible individuals to dicofol residues (12 .). ... 

These polymers were then interfacially reacted with di- and trifunctional aromatic acyl halides to give polyamides. Because the only reactive amine groups in these polymers were of the secondary amine type, such polymers should be chlorine-resistant. Dynamic chlorine tests (5 ppm, pH 6.0 to 6.5, 0.5% NaCI, 600 psi, 25°C) of 40 to 80 hours duration appeared to uphold this inference. 

Systematic monitoring programs that allow observation of the resistance dynamics are the basis for the development of rational resistance management concepts. The availability of detailed sensitivity profiles needs, in addition, discussion with authorities to improve resistance management programs. 

The basic geometry selected was that of a tension member support, which would support the cold mass of a magnet relative to the structure of the insulating vacuum vessel. This geometry was selected, since it permits configurations that could resist dynamic loading and could result in a support system whose loading was independent of temperature. 

These preliminary experiments suggest that the increase in fracture toughness was found to be linear with increasing fiber volume fraction whereas the increase associated with the impact resistance was non-linear. Significant improvement in both of these parameters indicates that chopped fibers can play important roles in resisting dynamic loads. Those conclusions are based on the chopped fiber of a length that is less than its critical length. 

When the crosslinked rubber level in the blend is high, the blends are rubbery with good elastic recovery properties, have low compression set values at elevated temperatures, and are processable as plastics. At low crosslinked rubber levels (<25%), these blends are tough and have very good impact resistance. Dynamic vulcanization was first practiced by Gessler [23] around 1958, when he described the preparation ofhalogenated butyl mbber and polypropylene on a heated roll mill. Most of the blends in the examples had only a small amount of rubber (20 wt%) and the curative used was a metal oxide. The mixing time was about 20 min at 320 ° F. It was shown that the dynamically vulcanized blends had better tensile properties than identical blends vulcanized at 320 °F under static conditions. Fischer [24] prepared... 

Rigidity, high T dimensional stability Rigidity, dynamic toughness Impact, temp, resistance Rigidity, chemical resistance, dynamic toughness... 

There are many aspects to consider when formulating for dynamic performance, where the elastomer experiences repeated cyclic deformation during service. The key properties include fatigue resistance, dynamic heat build up and adhesion to other components of the composite product. 

As the lung is stretched, it acts as an expanded balloon that tends to push air out and return to its normal size. The static pressure-volume relationship is nonlinear, exhibiting decreased static compliance at the extremes of lung volume [Johnson, 1991 ]. As with tissue resistance, dynamic tissue compliance does not remain constant during breathing. Dynamic compliance tends to increase with increasing volume and decrease with increasing frequency [Stamenovic et al, 1990]. 

Note Optimization = 2 factor, 2 and 3-level full factorial design—12 compounds and experiments. Responses (properties) to be measured Static ozone resistance dynamic ozone resistance flex-fatigue resistance extrusion processing high temperature, pressure pulse simulated application test of hose sample. 

Figure 4 A beagle dog was anesthetized with thyamylal sodium (Surital) and intubated. The tidal volume, pulmonary artery pressure, lung resistance, dynamic compliance, trans-pulmonary pressure, and airflow are shown before and following administration of 14 breaths of an irritant. Laurie acid was heated, in a La Mer-type condensation generator (19), the vapor was condensed in a cold trap operated below 0°C. The response was due to the small particles and any vapors that were not deposited in this trap. This aerosol-vapor was administered for 14 breaths, using a time-controlled series of soleniod valves and thus only transpulmonary pressure and arterial pressure are displayed during the challenge.

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