Die Dampfdruckquotienten P(CD3J)/P(CH3J) von unverdünntem Methyljodid und Trideuteromethyljodid nehmen zwischen ‐55 und 70°C von 1,061 auf 1,038 ab. Die Werte der Quotienten können aus der Verschiebung der innermolekularen Schwingungen mit der Kondensation abgeschätzt werden. Die Ermittlung von Werten, die die Meßwerte mit abnehmender Temperatur zunehmend übersteigen, legt jedoch nahe, daß der Beitrag der zwischenmolekularen Schwingungen nicht vernachlässigt werden kann. Die aus den Dampfdruckisothermen ermittelten Partialdruckquotienten der beiden Methyljodide in den Lösungen mit Hexan nehmen mit der Verdünnung ab. In Übereinstimmung mit den Ergebnissen aus der Theorie der Lösungsmittelverschiebung wird die Abnahme daraus erklärt, daß die Frequenzänderungen der Methyljodidmolekeln infolge der Solvatation kleiner sind als die infolge der Kondensation. Entgegen den Beobachtungen bei den entsprechenden Methylamin‐ oder Methanol‐Lösungen nimmt die Differenz der Totaldampfdrücke der CH3J‐ und der CD3J‐Lösungen mit dem Molenbruch annähernd linear zu. Außerdem sind die Aktivitätskoeffizienten, die freie Exzeßenthalpie und die Verdampfungsenergie für das System mit CH3J größer als für das mit CD3J. Diese Ergebnisse lassen sich dazu in Beziehung setzen, daß die Methyljodidmolekeln zwar eine Dipolwechselwirkung entfalten, aber nicht in einem Wasserstoffbrücken‐Assoziationsgleichgewicht vorliegen.
received this year, though the crops were undoubtedly aided by the carryover of moisture from the previous year. This year's yields will be less than half of last year's. In northern Kazakhstan where the other part of our party visited, crops were much more affected by the drought which seems to have blanketed most of the new lands area this year. Last year the yields were about 15 bushels per acre and this year from 2 to 6 bushels per acre. I am somewhat puzzled by what our group was told in Kazakhstan and what has since been mentioned a number of times in the Russian press, namely that the yields on new lands were much higher, say 6 bushels per acre, than on lands that had been plowed before, even twenty years before. What this may mean is that these lands soon lose their ability to retain moisture once the original cover is disturbed. If true, the yield prospects on much of this land may prove to be quite disappointing to the Russians. VII Russian agriculture presents one with paradoxes on all sides. You have bigness carried to the extreme in many things-farm sizes, machinery, sows, boars, barns and fields-but alongside this they have minute peasant farming on the small plots. Mechanization has been emphasized in field operations, but other aspects of grain production have been mechanized little if at all. There is centralization of marketing and production decisions, but free markets continue to have a very important role in feeding the city population and in providing incentives for rural people. Labor specialization is carried to an extreme on many farms, but there is little tendency to have specialization in crop production.I must confess that after my brief acquaintance with Soviet agriculture that I am hard pushed to explain why it works as well as it does, rather than being puzzled by why it has performed rather poorly.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.