In this case, (2) guarantees that has concentrated short-time Fourier transform (STFT), provided that this is calculated with a low-pass window function.
This phenomenon can be easily explained by : as slowly varying sinusoids have short-time spectral energy concentrated near their angular frequencies, if the frequencies are close, then their sum also has concentrated short-time spectral energy, therefore is also a slowly varying sinusoid.
Early warning signs of stress include headaches, sleep disturbances, difficulties concentrating, short temper, upset stomach, job dissatisfaction, and low morale.
Symptoms include hyperactivity, an inability to concentrate, short-term memory loss, frequent mood swings, chronic headaches, recurrent respiratory problems, asthma, unexplained changes in handwriting, aggressive or violent behavior, dark circles under the eyes, reddened outer ears and chronic skin rashes.
From now on, Walser concentrated on short prose, and it is tempting to suppose that his prodigious rambling contributed to the style of his later stories.
So then I concentrated on short stories and music while I waited for the waters in the lake to fill up again.
But, as in their July couture collection, they concentrated on short, sassy dresses, often using the bow as an exclamation point, spreading its wings across the front, perched across the back or even on the shoes.
The currently published double- or single-differencing techniques are all concentrated on short baselines and are not applicable for long baselines.
We also see that urban areas, especially concentrated within short distances of major capital cities were more likely than rural or suburban areas to see relatively high growth in the aftermath of the financial crisis.
Though some follow-up studies have concentrated on short and medium term outcomes after hysterectomy and endometrial ablation, there have been few long term controlled comparisons of hysterectomy with ablation techniques in women with heavy menstrual bleeding.
