Adder

This has the oxygenation pattern of a Diels-Adder adduct if we convert it to a carbonyl compound. 

Mikami et al. have reported that the chiral titanium reagent 12 derived from bi-naphthol and TiCl2(0-i-Pr)2 catalyzes the Diels-Adder reaction of a-bromoacrolein or methacrolein with isoprene or 1-methoxy-l,3-butadiene to afford the cycloadducts with high enantioselectivity [18] (Scheme 1.25). 

Natter, /, adder, viper, -wurz, -wurzel, /, bistort, cuckoopint,... 

Zuflihrer, m. adder, etc. (see zufiihren) feeder, feeding apparatus. 

Recalling Bennett s and Fredkin s trick to erase the garbage bits, the way in which the reversible logic circuit in figure 6.9 can be made to act as a real reversible serial-adder circuit is to first operate the circuit as shown, store the desired output, and then operate it backwards using the output and all intermediary garbage bits as new input. After all operations are completed in the reverse direction, we will be left with our desired answer stored on the side and with the serial-adder circuit back in its original state ready for another run. 

Fig. 6.9 A conservative-logic realization of a conventional serisJ adder circuit it is built entirely of Fredkin gates. Places along the wires marked with a dot represent unit time delays at those locations. Illustration patterns after [marg88] and [fredkin82]...

Andren C. (1982). The role of the vomeronasal organs in the reproductive behaviour of the Adder, Vipera berus. Copeia, 148-157. 

Dextroamphetamine/ amphetamine (Adderal 1) 2.5-5 mg once to twice daily T 2.5-5 mg in weekly intervals 10-30 mg every morning or 5-20 mg twice daily (40 mg/day)... 

The analysis showed, with various "value adders" (e.g., oxygen sales and carbon-emission-offset credits), the cost of wind-source gaseous hydrogen delivered by pipelines from production point to distant markets (about 200-1000 mi.) at an untaxed wholesale energy unit cost will be competitive with market prices (in 2005) of gasoline and hydrogen fuel made from natural gas by steam methane reforms (SMRs). 

Fig. 26 (a) The chemical structure of the molecular half-adder. The conformation of each N02 group encodes the logic input while the output status is encoded in the resistance between the drive and the output nano-electrodes. The complete truth table for the XOR and the AND outputs. Note the difference in magnitude between the XOR 1 and the AND 1 . (b) The T(E) spectra of the junction represented in Fig. 26 for all the logic inputs (solid line). Each inset emphasizes the modification of the conductance near the Fermi energy of the molecule. Each T(E) spectrum had been fitted in the active area to determine the minimum number of quantum levels required to reproduce it (dashed line)... 

In order to reveal the mechanism of this molecular half-adder, the T(E) spectra of the molecule are presented in Fig. 26b. When perpendicular to the plane of the molecule, each NO2 contributes a very sharp resonance which does not participate in the overall conductance. When rotated by 90°, an NO2 introduces a supplementary resonance in the gap of the molecule. Due to its asymmetrical delocalization over the atomic orbitals, this resonance increase the conduction between the drive and the XOR electrode, but not between the drive and the AND electrode. This insures a 1 output for the former and a 0 for the latter. When the two NO2S are rotated, the two resonances they introduce create a deep interference between the drive and the XOR electrode. Located on the Fermi energy of the molecule, this interference leads to a low conductance state and a 0 logical output for the XOR gate. In contrast, the two resonances do not interfere destructively between the drive and the AND electrode, leading to a high conductance state and a 1 logical output. 

Fig. 27 (a) Optimized graphene sheet for the realization of a half-adder. Each logical input noted a and [i controls the photoisomerization state of one of the two stilbene groups. Depending on this isomerization state, the overall conductance of the molecule between the three electrodes is modified, (b) Current intensity calculated in the two output electrodes depending on the conformation of the stilbene groups... 

Pei-li L, De-xui H, Xin-Liang Z, Guang-xi Z (2006) Ultrahigh-speed all-optical half adder on four-wave mixing in semiconductor optical amplifier. Opt Express 14 11840... 

Duchemin I, Renaud N, Joachim C (2008) A intramolecular digital 1/2-adder. Chem Phys Lett 452 269... 

Andren, C. (1986) Courtship, mating and agonistic behavior in the free-living population of adders, Vipera berus (L.). Amphibia-Reptilia 7, 353-383. 

Marsh et al. [47] have described an apparatus based on an autoanalyser system for the automatic preparation of soil extracts for mineral nitrogen determination. It consists of a reagent adder, which adds the correct volume of extractant for an approximately weighed amount of soil, and a sample preparation unit, which mixes, filters, dilutes and loads samples on to an autoanalyser sampler. A labour saving of 60% is achieved in this method compared to manual method. Examples are given of the determination of nitrate plus nitrate nitrogen and ammonium nitrogen. 

Tests were carried out to compare the efficiency of extraction results obtained using a manual weighing and sample preparation method, and the reagent adder and sample preparation unit. Extracts of four replicates of ten soils were prepared by each method and analysed for nitrate- plus nitrite-nitrogen by a diazotisation and coupling reaction with sulphanilic acid and N-(l-naphthyl)ethylenediamine and ammonium-nitrogen by an indophenol method. These methods are described fully by Greaves et al. [48]. 

A host of gadgets and software are available to perform a variety of computations and logical operations with control signals. For example, adders, multipliers, dividers, low selectors, high selectors, high limiters, low limiters, and square-root extractors can all be implemented in both analog and computer systems. They are widely used in ratio control, in computed variable control, in feedforward control, and in override control. These will be discussed in the next chapter. 

A binary decoder, a binary adder, and a stack memory can be built. 

Another model for an analog computer was suggested by Rubel [158,159], Called an extended analog computer, it is also based on a finite number of functions that are applied on independent variables. The machine consists of several levels, and the outputs of level A — 1 are used as the inputs of level N. The computing is achieved by black boxes of various kinds, such as adders, multipliers, substituters, and differentiators. 

Gravity-operated binary adder circuif made of soda straws, straight pins, tinker toy parts and marbles (1959)... 

Male adders Vipera berus) fight for access to unmated females. Courtship starts in spring only after sexually active males have shed their skins. Males tongue flick at females and court them but attack other shed males. If a recently shed male meets a non-shed male or female, he will ignore both. In summary, the male adder needs a chemical cue from the skin to court or fight (Andren, 1982). 

I have done a little testing at maybe 7 bar - till it started arcing in the rectifier. Current problem is specifying the adder diodes - direction, count, etc. I am using 1 KV 75 nS Trr - quick recovery diodes, costing. 09 each, in parallel with 1.5 M 1/2 W metal film 1% resistors. 

Big change, it looks like about 40 needed in the low voltage adder between the supply output and the plug terminal. Can... 

For advanced 0.18- m technologies the commonly measured particles at 0.2 um are very close to the linewidth and thus potentially very dangerous. The SI A roadmap suggests that back-end processes for 0.18-/rm technologies should contribute no more than 50 adders at 0.09 /tm for a 200-mm wafer. 

In the UK, the adder (Vipera berus) represents the only indigenous poisonous snake and adder antivenin preparations are termed Zagreb antisera . European viper venom antisera contain antibodies capable of neutralizing the venoms of one or more species of viper Vipera ammodytes, V. aspis, V. berus and V. ursinii). In many instances, antivenin preparations are polyvalent in nature. This is particularly helpful in cases where the victims are unsure of which snake actually bit them. 

Zagreb antivenin European viper venom antisera Polyvalent Crotalidae antivenin Micrurus fulvius antivenin Australian polyvalent antivenins Adder bites One or more species of viper Any one of four species of pit viper (including Western diamond back and South American rattlesnake Eastern coral snake Micrurus fulvius) Any one or combination of black snake, brown snake, death adder, taipan and tiger snake... 

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