The Bis(ferrocenyl)phosphenium Ion Revisited

The bis(ferrocenyl)phosphenium ion, [Fc2P]+, reported by Cowley et al. (J. Am. Chem. Soc. 1981, 103, 714–715), was the only claimed donor‐free divalent phosphenium ion. Our examination of the molecular and electronic structure reveals that [Fc2P]+ possesses significant intramolecular Fe⋅⋅⋅P contacts, which are predominantly electrostatic and moderate the Lewis acidity. Nonetheless, [Fc2P]+ undergoes complex formation with the Lewis bases PPh3 and IPr to give the donor–acceptor complexes [Fc2P(PPh3)]+ and [Fc2P(IPr)]+ (IPr=1,3‐bis(2,6‐diisopropylphenyl)imidazole‐2‐ylidene)

THE PRODUCTIVITY OF SOME WHEAT VARIETIES IN THE SOIL AND CLIME CONDITIONS FROM SOUTH-WESTERN ZONE OF MEHEDINTI COUNTY

The researches aimed the comparative study of some winter wheat varieties in conventional cropping system in the conditions of reddish preluvosoil from Vanju Mare, on a 400 ha surface for a better knowing of their features in order to recommend them for cropping. During two years (2016 – 2017) there have been cropped the following wheat crop kinds: Glossa – romanian variety and two austrian varieties: Balaton and Astardo.Regarding the yield obtained by Glossa variety, it recorded an average of 6.100 kg/ha and Balaton and Astardo varieties, an average yield of 7200 kg/ha. The high yield recorded by austrian varieties is due to the fact that they belong to Premium group, very productive, very tolerant to drought and with high ecological plasticity, with good winter resistance, high tillering capacity, highly receptive to fertilizers and superior as quality. The biologic potential is very high, reaching 11.000 kg/ha. The protein content of the wheat grain depends on the following factors: the variety, the cropping technology (irrigation, fertilization) and the soil and clime conditions. Good protein content determines a good baking quality. Among the technological factors, the fertilization is the most important that increases the protein content of the wheat kernels. The wet gluten content and the falling index are favorably influenced by the nitrogen fertilizer applying. There is recommended the cropping of wheat varieties that have a high production capacity, with a good resistance to the main risk factors of the clime, with tolerance to the main foliar diseases, with superior quality indicators from different maturity classes

Embedded finite-element solver for computation of brushless permanent-magnet motors

This paper describes the theory underlying the formulation of a “minimum set” of finite-element solutions to be used in the design and analysis of saturated brushless permanent-magnet motors. The choice of finite-element solutions is described in terms of key points on the flux–MMF diagram. When the diagram has a regular shape, a huge reduction in finite-element analysis is possible with no loss of accuracy. If the loop is irregular, many more solutions are needed. This paper describes an efficient technique in which a finite-element solver is associated with a classical $d$– $q$-axis circuit model in such a way that the number of finite-element solutions in one electrical half-cycle can be varied between 1 and 360. The finite-element process is used to determine not only the average torque but also the saturated inductances as the rotor rotates

EFFECTS OF INTERACTION BETWEEN ABIOTIC STRESS AND PATHOGENS IN CEREALS IN THE CONTEXT OF CLIMATE CHANGE: AN OVERVIEW

The scenario that climate change will lead to higher incidence of crop diseases, following geographical distribution of the host and cropping technology, suggests that can be positive, negative or neutral depending of multiple interactions between host, pathogens and abiotic stress factors. Both plants and pathogens are constantly threatened by abiotic stress factors such as high temperature, moisture, drought, salinity, soil pH, greenhouse gases, Ultraviolet-B (UVB) radiation and air pollutants. Currently the research focused on this topic is inconsistent therefore these interactions are poorly understood. In the process of adaptation to these adverse conditions, it is expected that abiotic stress factors impact pathogens into a wide range of responses such as changes in life cycles (pathogen reproduction – shorter incubation -, dispersal, survival and activity), increased incidence, modified pathogenicity, genetically recombination and aggressiveness traits.  The present review is focused particularly on the impact of abiotic stress factors on cereals pathogens and all changes in their life cycles and host-pathogen interaction associated with under climate change conditions. However, our study suggest that a better understanding of interaction between pathogens and abiotic stress factors can be an important mechanism to estimate disease risk on a large scale and to introduce new understandings in developing management strategies

Малярчук О.М. Тоталітаризм проти західноукраїнського села

Рецензі на монографію Малярчук О.М. Тоталітаризм проти західноукраїнського села. – Івано-Франківськ: Місто НВ, 2008. – 228 с

EFFECT OF LEVELLING ON THE ENERGY BALANCE OF MAIZE CROP FOR GRAINS

        Maize is recognized as a plant that greatly harnesses the allocated factors-the insurance with water and mineral fertilization-, bringing a substantial energy intake especially in the context of rational crop revolutions. From the point of view of fertilization, maize producing a large amount of plant substance at the surface unit, consumes high amounts of the main nutrients, which is a plant ,, voracious by excellence "and which responds promt to applied, but necessary water should be ensured at the appropriate time. The energy analysis in the case of maize for grains has shown high energy values produced in both cases concerning the location of culture-non-ivelate and even on ground level

RESEARCHES CONCERNING WEED CONTROL ON POTATO

Potato is a very important crop in Romania, after corn and wheat and this is why this crop must be attractive for farmers through financial advantages and high yields that should feed the people. The using of herbicides is a compulsory measure for efficacy of this crop. In order to test some herbicides used for potato crop we have tested some herbicides at the Botanic Garden of University of Craiova, in 2017. There were used the following substances and rates: V1 – Stomp 5 l/ha; V2 – Stomp 6 l/ha; V3- Stomp 5 l/ha + 1 l/ha Roundup (tank mix); V4 – Stomp 5 l/ha + 1 l/ha Roundup (tank mix) and 3 l/ha Roundup, selective treatment on spots; V5- Roundup 1 l/ha, (two treatments) without any preemergent herbicide;V6 – Goal 4F 0,5 l/ha; V7 – Goal 4F 0,7 l/ha; V8- untreated control. The best results have been given by V1, 2 and 6 treatments, where there are not perennial dicots. Where Convolvulus arvensis and Cirsiumarvense are present there must be applied a 3.5 liters per hectare Roundup before potato emergence

Intramolecular Reaction of Transient Phosphenium and Arsenium Ions Giving Rise to Isolable 9-Phospha- and 9-Arsena-Fluorenium Ions

Transient phosphenium and arsenium ions, generated by fluoride abstraction from bis(m-terphenyl)fluoropnictogens, underwent intramolecular electrophilic attack prior to methyl group migration and gave rise to isolable 9-phospha- and 9-arsena-fluorenium ions

Activities across Africa to improve antimicrobial utilisation and reduce AMR

There are concerns with current prescribing and dispensing of antimicrobials in Africa. Point prevalence studies in hospitals shown variable rates with high rates HIV in some. Variable ASPs, extended prophylaxis and high rates self purchasing in some