1930 yılından günümüze uzanan aerojeller; Guinness rekorlar kitabına giren en hafif ve katı malzeme olarak seçilmiştir. Yüksek ısıl absorbsiyon özelliği, çok iyi yalıtkanlık kabiliyeti, mezo gözenek yapısı mukavemetinin yüzey alanının yüksek olması gibi üstünlüklerinin birçok malzemeye alternatif kullanım avantajı sektörde olanağı sunmaktadır. Bu çalışmada, sol-jel tekniği kullanılarak saflıkta...

spontaneous breathing as soon as possible 2 and lowpressure suction of the chest tubes after operation are critical.2, 3 Some ventilatory support is necessary, however, when a patient continues to have hypoventilation after operation. Pressure-controlled ventilation rather than volume-controlled ventilation has been recommended for such patients because it can deliver high inspired gas flows in...

Semicarbazide, a lathyrogen, was given to growing rats to elucidate the consequences of altering the molecular structure of fibrous proteins within the lung. Static pressure-volume (P-V) measurements during deflation of saline-filled lungs showed normal recoil pressure and compliance values within the physiological range of lung volume. Quasi-static P-V measurements were also normal during slow...

-Stoichiometric reactions of metal hydroxycarbonates with the acid trans-l,2cyclohexanediaminotetraacetic acid (H4CDTA) in water under reduced pressure yielded [Cu(H2CDTA)]'H20 (I) and [Ni(H2CDTA)(H20)]'4H20 (II). Both compounds were characterized by TG-DTA analysis, spectral properties (IR, reflectance and RSE) and Xray diffraction. In I the copper(II) atom exhibits a distorted square-base coo...

This paper examines the tax structures of the Middle East and North Africa (MENA) countries by focusing on the quality of governance and demographic changes as two influential factors in region’s economies. The objective of is to determine whether these factors can explain the variation in the tax structures of these countries. Results from regressions on the MENA countries and the ones based o...

We investigate the effects of fiscal policy surprises for US data, using vector autoregressions. We overcome the difficulties that changes in fiscal policy may manifest themselves in variables other than fiscal variables first and that fiscal variables may respond ”automatically” to business cycle conditions. We do so by using sign restrictions on the impulse responses as method of identificati...

Brain Gain: Claims about Its Size and Impact on Welfare and Growth Are Greatly Exaggerated Based on static partial equilibrium analysis, the “new brain drain” literature argues that, by raising the return to education, a brain drain generates a brain gain that is, under certain conditions, larger than the brain drain itself, and that such a net brain gain results in an increase in welfare and g...

This paper analyzes the effects of differential tax treatment of corporate and non-corporate income in the U.S. on capital accumulation, the allocation of resources across sectors, entrepreneurship, and the distribution of wealth. I develop an entrepreneurial choice model with two important frictions, financial constraints and uninsurable business risk, that is broadly consistent with empirical...

We re-examine the destabilizing role of balanced-budget fiscal policy rules based on consumption taxation. Using a one-sector model with infinitely-lived households, we consider a specification of preferences derived from Jaimovich (2008) [14] and Jaimovich and Rebelo (2009) [15] which is flexible enough to encompass varying degrees of income effect. When the income effect is not too large, we ...

We report a case of a 40 year old man with portal hypertension caused by a splenic arteriovenous fistula that was diagnosed at laparotomy. He presented with bleeding esophageal varices and was initially treated by sclerotherapy. At laparotomy, portal pressure was 40 cmH20 but fell to 20 cm H20 after the fistula was treated with splenectomy. All symptoms disappeared shortly after operation ...