Hidradenocarcinoma (HC) is a rare malignant sweat gland tumor with metastatic potential primarily located in the head, neck, and trunk. We present an unusual case of a large lower extremity Clear ...Cell HC managed with surgical resection and adjuvant locoregional radiation after excluding lymph node involvement.
We prove a characterization of monomial projective representations of finitely generated nilpotent groups. We also characterize polycyclic groups whose projective representations are finite ...dimensional.
Graphene quantum dots (GQDs) are a promising category of materials with remarkable size dependent properties like tunable bandgap and photoluminescence along with the possibility of effective ...chemical functionalization. Doping of GQDs with heteroatoms is an interesting way of regulating their properties. Herein, we report a facile and scalable one-step synthesis of luminescent GQDs, substitutionally co-doped with N, F and S, of ∼2 nm average size by a microwave treatment of multi-walled carbon nanotubes in a customized ionic liquid medium. The use of an ionic liquid coupled with the use of a microwave technique enables not only an ultrafast process for the synthesis of co-doped GQDs, but also provides excellent photoluminescence quantum yield (70%), perhaps due to the interaction of defect clusters and dopants.
We describe the 2-cocycles, Schur multiplier and representation group of discrete Heisenberg groups over the unital rings of order
.
We also describe all projective representations of Heisenberg ...groups with entries from the rings
and
for odd primes 𝑝 and obtain a classification of their degenerate and non-degenerate 2-cocycles.
Spatial and temporal variability of rainfall over different seasons influence physical, social and economic parameters. Pre-monsoon (March, April and May – MAM) rainfall over the country is highly ...variable. Since heat lows and convective rainfall in MAM have an impact on the intensity of the ensuing monsoons, hence the pre-monsoon period was chosen for the study. The pre-whitened Mann Kendall test was used to explore presence of rainfall trend during MAM. The results indicate presence of significant (at 10% level) increasing trend in two stations (Ajmer, Bikaner). The practical significance of the change in rainfall was also explored as percentage changes over long term mean, using Theil and Sen's median slope estimator. Forecast using univariate ARIMA model for pre-monsoon months indicates that there is a significant rise in the pre-monsoon rainfall over the northwest part of the country.
La variabilité spatiotemporelle de la pluviosité sur différentes saisons influence les paramètres physiques, sociaux et économiques. La pluviosité pré-mousson (mars, avril et mai – MAM) sur la région est extrêmement variable. La période pré-mousson a été choisie pour cette étude, étant donné que l’abaissement de chaleur et la pluviosité convective pour la période MAM ont un impact sur l’intensité des moussons qui suivent. Le test Mann Kendall de pré-blanchiment a été utilisé pour explorer la possibilité d’une évolution de la pluviosité pendant la période MAM. Les résultats indiquent une tendance significative à l’accroissement (à un niveau de 10 %) dans deux stations (Ajmer et Bikaner). La signification pratique du changement dans la pluviosité a aussi été explorée dans le sens de changements sur une moyenne à long terme utilisant l’estimateur de pente moyenne de Theil et Sen. La prévision utilisant le modèle ARIMA à une variable pour les mois de pré-mousson indique une augmentation significative de la pluviosité de pré-mousson dans la partie nord-occidentale de la région.
We report on the photo-conductivity studies of chemically synthesized graphene quantum dots (GQDs) of average size 12 nm obtained by the oxidative acid treatment of MWCNTs. The dependence of ...photocurrent Iph (Iph = Iill - Idark) on the laser intensity P under a wide range of laser intensities (5 mW ≤ P ≤ 60 mW) shows a fractional power dependence of Iph on light intensity. The temperature dependence (300 K < T < 50 K) of Iph observed in thin films of these GQDs indicates that in the higher temperature region (T > ∼100 K), as the temperature increases, the number of thermally generated carriers increase resulting in increased Iph. At sufficiently low temperatures (T ≤ 100 K), a constant Iph is observed, indicating a constant photo-carrier density. Such a behavior is typically observed in many photoactive disordered semiconductors, which are often used in a variety of applications. We believe that the investigations presented here will enhance our understanding of the photocurrent generation phenomenon in chemically obtained GQDs.
We report on the photo-conductivity studies of chemically synthesized graphene quantum dots (GQDs) of average size 12 nm obtained by the oxidative acid treatment of MWCNTs. The dependence of ...photocurrent
I
ph
(
I
ph
=
I
ill
−
I
dark
) on the laser intensity
P
under a wide range of laser intensities (5 mW ≤
P
≤ 60 mW) shows a fractional power dependence of
I
ph
on light intensity. The temperature dependence (300 K <
T
< 50 K) of
I
ph
observed in thin films of these GQDs indicates that in the higher temperature region (
T
> ∼100 K), as the temperature increases, the number of thermally generated carriers increase resulting in increased
I
ph
. At sufficiently low temperatures (
T
≤ 100 K), a constant
I
ph
is observed, indicating a constant photo-carrier density. Such a behavior is typically observed in many photoactive disordered semiconductors, which are often used in a variety of applications. We believe that the investigations presented here will enhance our understanding of the photocurrent generation phenomenon in chemically obtained GQDs.
A schematic representation of the photocurrent generation by laser power from GQDs.
Pre‐monsoon (March, April and May ‐ MAM) rainfall over India is highly variable. A pre‐whitened Mann‐Kendall test was used to investigate trends in rainfall during MAM. The results indicate the ...presence of a significant (at the 10% level) increasing trend at four stations (Ajmer, Bikaner, Indore and Kolkata), out of which two stations (Ajmer and Bikaner) show a statistically significant increasing trend. A decreasing trend is observed at two stations (Belgaum and Minicoy). Practical significance was also explored in terms of percentage changes, using the Theil‐Sen median slope estimator. Forecasts made using a univariate autoregressive integrated moving average (ARIMA) model for MAM indicate that there has been a significant rise in the pre‐monsoon rainfall over the northwestern part of India.
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