نتایج جستجو برای: 25 75
تعداد نتایج: 466833 فیلتر نتایج به سال:
In this work infiltration behavior of mechanical alloyed 75 wt% Cu – 25 wt% WC powders into porous WC compacts were studied. Owing to their ductile nature, initial Cu powders were directly added to mechanical alloying batch. On the other hand initial WC powders were high energy milled prior to mechanical alloying. Contact infiltration method was selected for densification and compacts prepared ...
This work was intended to evaluate the prevalence of obstructive small-airway disease in patients with rheumatoid arthritis (RA) and its association with clinical characteristics. Pulmonary function testing (PFT) and high-resolution computed tomography (HRCT) were performed on 189 consecutive RA patients. Each case was diagnosed based on abnormal HRCT findings. We defined obstructive dysfunctio...
The demand for very low sulfur fuel oil (VLSFO) with a content of less than 0.5% has increased since the IMO2020 regulations were published. However, most VLSFOs marine are produced by blending two oils different contents, which causes some problems, such as sludge formation. This study investigates effect ultrasonic irradiation frequency (25 and 72 kHz), time (0, 12, 24 h), ratio (marine gas (...
In the study, use of hydroponic green oats (Arrenatherium elatius) was evaluated in productive behavior guinea pigs for analysis it handled with a completely randomized design (DBCA), also verified an variance (ADEVA) and significant Turkey tests at 5%. The treatments used were: T1: (100:0) =100% cut 0% hydroponic, T2: (75:25) =75% 25% T3: (50:50) =50% 50% T4: (25:75) =25% 75% T5: (0:100) =0% 1...
PURPOSE Airway remodeling may be responsible for irreversible airway obstruction in asthma, and a low post-bronchodilator FEV1/FVC ratio can be used as a noninvasive marker of airway remodeling. We investigated correlations between airway wall indices on computed tomography (CT) and various clinical indices, including post-bronchodilator FEV1/FVC ratio, in patients with asthma. METHODS Volume...
STUDY OBJECTIVE The ratio between forced expiratory flow between 25% and 75% of vital capacity (FEF(25-75)) and FVC is thought to reflect dysanapsis between airway size and lung size. A low FEF(25-75)/FVC ratio is associated with airway responsiveness to methacholine in middle-aged and older men. The current study was designed to assess this relationship in both male and female subjects over a ...
OBJECTIVE To assess whether there was an independent association between maternal 25-hydroxyvitamin D concentrations at 24-28 weeks of gestation and preterm birth in a multicenter U.S. cohort of twin pregnancies. METHODS Serum samples from women who participated in a clinical trial of 17 α-hydroxyprogesterone caproate for the prevention of preterm birth in twin gestations (2004-2006) were ass...
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