Mobile Making

At the highest level of abstraction, hydrogen fuel is one of the options being considered in the World s quest for sustainable mobility. This, as discussed for instance in a recent report of the World Business Council for Sustainable Development, is a multifaceted subject, encompassing everything from future fuels to future vehicle technology and transportation infrastructure, in all of which major strides forward are needed [1], In what follows we restrict ourselves to fuels. But the fact that a sustainable fuel is just an element of the complex issue of sustainable mobility makes clear that such a fuel must meet a complex and sometimes contradictory set of demands. The following three requirements stand out a sustainable fuel should, in a cost effective way, contribute to... 

It is interesting that the PEMA-PVdF blends are amorphous up to at least 50 wt % PVdF even though the Tg of the latter is 24°C. The crystallization of PVdF observed in the analogous PMMA blend does not occur under the same conditions with PEMA—PVdF. This suggests that there is a specific interaction between the fluoropolymer and the methacrylate polymer which is sufficient to "dissolve PVdF in the PMMA and PEMA, and that this specific interaction is superimposed on the conventional diluent-crystalline polymer interactions. The complexity of the rate processes involved with high molecular weight systems arising from molecular mobility makes it impossible to elucidate the nature of... 

The specific conductivity (y) is a measure of the mobility of ions in an electrolyte or electrons in a metallic conductor. Thus, y is about 1 or 107 S/m for a 0.1 kmol/m3 aqueous salt solution or for a metal such as iron, respectively. Such a difference in charge mobility makes the temperature dependence of % [i-e.,(l/x)3x/97k] positive for ions of about 2.5% per K, but negative for metals and alloys of approximately an order of magnitude lower (Prentice, 1991). 

Cut rigid 12- or 14-gauge wire into lengths about 2 cm longer than necessary to construct the planned mobile. Make a loop at each end of each wire. 

Other activities have been revised. In Activity 1.8, Create Your Own Atom, students create a two-dimensional drawing of an atomic theory. In addition, classmates have to guess the theory and critique the drawings as works of art. In Activity 4.4, Construction of a Three-dimensional Periodic Table, students are referred to mobile making for their periodic table construction. Many activities have changes that clarify the activity and add additional approaches to achieving the activity objectives. 

The effect of a limited mobility of holes in the material may be accounted for in Eq. (1) by using a parameter called the mobility field, E, which is the electric field necessary for a hole to drift 1 radian across a sinusoidal intensity pattern in one hole recombination lifetime. The assumptions of long lifetime and high mobility make the mobility field small in comparison with the projection of the poling field along... 

The unique capability of NMR spectroscopy to differentiate by means of molecular mobility makes it a perfect tool to assign chemical constituents to structural elements of a particle dispersion. This is most straightforward in the case of dispersed nanospheres every constituent which is part of the solid matrix will exhibit the slow particle tumbling, while all components of the liquid continuous phase undergo rapid rotational diffusion. 

The 4H polytype has a wider gap compared to 6H and a much higher electron mobility, making the growth of the 4H polytype of significant practical interest. Favourable properties of this polytype could not be employed in the early studies since the abundance of the 4H polytype in crystals grown by the Lely process is below 1 %. Currently methods of governing the polytype structure permit the intentional growth of this polytype. 

The low partition coefficient of 1 indicates that it has no potential to accumulate in biological tissues and, therefore, also not in the food chain. The rapid uptake and translaminar transport of 1 is excellent, as observed in cabbage leaves [23] and in rice and cucumber [24]. Additionally, 1 has a considerable acropetal mobility in xylem of plants. In contrast, its penetration and translocation in cotton leaves was less pronounced, as shown by phosphor-imager autoradiography [25]. This xylem mobility makes 1 especially useful for seed treatment and soil application, but it is equally active for foliar application. Owing to its lack of any acidic hydrogen, the pK of 1 is >14 and, therefore, its transport within the... 

The chemical trend shown on the chemistry graph is named the Irving-Williams series, after the two chemists who first put it in order. Williams is R. J. P. Williams, who first noticed that the biological concentrations are the inverse of his own chemical series. Beyond his apparent skills in mobile-making, Williams has published several books with coauthors about how this type of chemical observation can help explain past and present biology. 

The solubility is relatively unaffected except at very high degrees of cross-linking or when the penetrant significantly swells the polymer. The constraint of crosslinking on segmental mobility of the polymer makes the diffusion process more dependent on the size and shape of penetrant molecules. The decreases in inherent segmental mobility makes the diffusion process more concentration dependent. 

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