Στην παρούσα διατριβή μελετάται η ανάπτυξη και οι ιδιότητες λεπτών υμενίων HfΟ₂ και CeΟ₂, ανεπτυγ... more Στην παρούσα διατριβή μελετάται η ανάπτυξη και οι ιδιότητες λεπτών υμενίων HfΟ₂ και CeΟ₂, ανεπτυγμένων σε υπόστρωμα Ge, με στόχο τον συνδυασμό διηλεκτρικών πύλης υψηλής διηλεκτρικής σταθερός με ημιαγώγιμα υλικά μεγάλης ευκινησίας φορέων. Τα οξείδια αναπτύσσονται με την τεχνική της μοριακής επιταξίας και οι μηχανισμοί ανάπτυξης μελετώνται με διάφορες τεχνικές χαρακτηρισμού (ηλεκτρικές μετρήσεις, XRR, XPS, ToF-SIMS, ΤΕΜ). Η κατανόηση των μηχανισμών ανάπτυξης επιτρέπει την βελτιστοποίηση των ιδιοτήτων τους και, τελικά, τη χρήση τους σε λειτουργικά MOSFET, με πολύ καλά χαρακτηριστικά. Είναι γνωστό από τη βιβλιογραφία ότι η απευθείας ανάπτυξη του HfΟ₂ σε υπόστρωμα Ge δίνει διατάξεις με φτωχά ηλεκτρικά χαρακτηριστικά. Με την παρεμβολή, μεταξύ HfΟ₂ και Ge, ενός στρώματος GeON, επετεύχθη μεν βελτίωση των ηλεκτρικών χαρακτηριστικών (lg~1x10-8 Α/cm², Dìt~5x 10¹²-10¹³eV⁻¹cm⁻², χαμηλές τιμές EOT), διαπιστώθηκε όμως (με τεχνική ToF-SIMS) εισχώρηση ατόμων Ge στο υμένιο του οξειδίου, με αποτέλεσμα...
Germanium MOS transistors with high-k gates are good alternatives for the replacement of SiO2 in ... more Germanium MOS transistors with high-k gates are good alternatives for the replacement of SiO2 in order to improve the performance of modern devices. Especially rare-earth oxides on germanium deposited by molecular beam deposition (MBD) have shown improved ...
This study aimed to determine hypertension prevalence and levels of awareness, treatment and cont... more This study aimed to determine hypertension prevalence and levels of awareness, treatment and control of hypertension among diabetic patients using data from the VANK study. The sample consisted of 221 men and women (122/99) diagnosed with type 2 diabetes. Semi-structured interviews were conducted with all participants. Controlled hypertension definition was based on having a systolic blood pressure (BP) of <130 mmHg and diastolic BP of <85 mmHg in subjects taking antihypertensive medications. The mean +/- SD BP was 141.6 +/- 17.4 mmHg and 81.2 +/- 9.4 mmHg for systolic and diastolic BPs, respectively. Systolic and diastolic BP was higher in men than in women. The overall prevalence of hypertension was 194/221 (87.7%). In total, 34.1% of patients (66/194) were not aware of having hypertension. Of those who were aware of having hypertension (n = 128, 65.9%), all were treated. Among those treated, only 11 persons (11/194, 5.6%) had systolic BP <130 mmHg and diastolic BP <85...
Out of 1705 patients hospitalised for various reasons in the 3rd Internal Medicine Department of ... more Out of 1705 patients hospitalised for various reasons in the 3rd Internal Medicine Department of the Regional General Hospital of Nikaea, in Piraeus, 146(8,5%) persons were admitted for drug intoxication between November 1999 and November 2000. On average, these persons [male 50(34,2%)--female 96(65,8%)] were admitted to the hospital within 3.7 hours after taking the drug. The drugs that were more frequently taken, alone or in combination with other drugs, were sedatives (67.1%), aspirins and analgesics (mainly paracetamol) (43.5%). 38.3% of patients had a mental illness history, 31.5% were in need of psychiatric help and 45.2% had made a previous suicide attempt. No death occurred during the above period and the outcome of the patients' health was normal. After mental state examination, the mental illnesses diagnosed were depression (20.96%), psychosis (15.32%), dysthymic disorder (16,2%), anxiety disorder (22.58%) and personality disorder (8.87%). Self-poisoning remains a cruc...
To examine trends in the prevalence of myocardial infarction (MI) and conventional risk factors i... more To examine trends in the prevalence of myocardial infarction (MI) and conventional risk factors in Greek adults between 2002 and 2006. Repeated cross-sectional study. Self-reported data from surveys given in Salamis during two election days in 2002 and 2006 were analysed. The same sampling method and procedures were used on both surveys. The study sample included 2805 and 3478 subjects (&gt; or =20 years) in 2002 and 2006, respectively, with similar age and sex distribution to the target population. The prevalence of MI increased from 4.1% (men, 6.3%; women, 1.9%) in 2002 to 4.8% (men, 7.3%; women, 2.2%) in 2006 (P = 0.18). At the same time, prevalence rates of major risk factors were as follows: diabetes increased from 8.7% to 10.3% (P = 0.037), hypertension from 20.1% to 25.7% (P &lt; 0.001) and hypercholesterolemia (cholesterol &gt;240 mg/dl or the use of cholesterol-lowering medication) increased from 17.5% to 22.3% (P &lt; 0.001). Prevalence of current smokers in 2002 (defined as persons who smoked &gt; or =5 cigarettes/day) was 37.0% and in 2006 (defined as those who smoked &gt; or =1 cigarettes/day) was 40.1%. Logistic regression analysis showed that the aforementioned risk factors were significantly associated with MI in both surveys; the factor that showed the greatest magnitude of association with MI was hypercholesterolemia, followed by diabetes, hypertension and smoking. These findings show that, in the Greek population, prevalence of MI continues to rise (at approximately 4% per year). This trend seems to be driven by a persistently high prevalence of smoking and the rapidly increasing burden of diabetes, hypertension and hypercholesterolemia.
ABSTRACT The molecular and atomic oxidation of molecular beam deposited Se passivating layers on ... more ABSTRACT The molecular and atomic oxidation of molecular beam deposited Se passivating layers on Ge substrates was in situ investigated by X-ray photoelectron spectroscopy. It turns out that while Se is efficient in suppressing Ge oxidation upon molecular oxygen exposure, an extra thin Al layer is needed to protect the Ge surface from highly reactive atomic oxygen radicals. Electrical measurements performed on the Al-covered surfaces reveal that Se is beneficial in reducing the interface state density.
We have performed the first structural study of formate adsorbed on Cu(111). The local registry o... more We have performed the first structural study of formate adsorbed on Cu(111). The local registry of formate has been determined using normal incidence X-ray standing wavefield absorption (NIXSW). The oxygen atoms of the formate were located in atop sites, with NIXSW measurements made using the (1̄11) planes suggesting that they could be statically displaced by up to 0.33Å, and with the formate bridging two copper atoms. This adsorption site is identical to that found for formate on Cu(110) and Cu(100) by Woodruff and co-workers. The oxygen–(111) plane separation determined by NIXSW was 1.89Å. This would, assuming that the oxygen atoms are displaced by 0.33Å from a perfect atop position and no relaxation of the underlying substrate, infer a upper limit for the CuO separation of 1.92±0.04Å. This value compares with CuO separations of 1.98±0.04Å for formate on both Cu(100) and Cu(110), and the average value of 1.97Å observed for all known μ2-formate–copper complexes.
Στην παρούσα διατριβή μελετάται η ανάπτυξη και οι ιδιότητες λεπτών υμενίων HfΟ₂ και CeΟ₂, ανεπτυγ... more Στην παρούσα διατριβή μελετάται η ανάπτυξη και οι ιδιότητες λεπτών υμενίων HfΟ₂ και CeΟ₂, ανεπτυγμένων σε υπόστρωμα Ge, με στόχο τον συνδυασμό διηλεκτρικών πύλης υψηλής διηλεκτρικής σταθερός με ημιαγώγιμα υλικά μεγάλης ευκινησίας φορέων. Τα οξείδια αναπτύσσονται με την τεχνική της μοριακής επιταξίας και οι μηχανισμοί ανάπτυξης μελετώνται με διάφορες τεχνικές χαρακτηρισμού (ηλεκτρικές μετρήσεις, XRR, XPS, ToF-SIMS, ΤΕΜ). Η κατανόηση των μηχανισμών ανάπτυξης επιτρέπει την βελτιστοποίηση των ιδιοτήτων τους και, τελικά, τη χρήση τους σε λειτουργικά MOSFET, με πολύ καλά χαρακτηριστικά. Είναι γνωστό από τη βιβλιογραφία ότι η απευθείας ανάπτυξη του HfΟ₂ σε υπόστρωμα Ge δίνει διατάξεις με φτωχά ηλεκτρικά χαρακτηριστικά. Με την παρεμβολή, μεταξύ HfΟ₂ και Ge, ενός στρώματος GeON, επετεύχθη μεν βελτίωση των ηλεκτρικών χαρακτηριστικών (lg~1x10-8 Α/cm², Dìt~5x 10¹²-10¹³eV⁻¹cm⁻², χαμηλές τιμές EOT), διαπιστώθηκε όμως (με τεχνική ToF-SIMS) εισχώρηση ατόμων Ge στο υμένιο του οξειδίου, με αποτέλεσμα...
Germanium MOS transistors with high-k gates are good alternatives for the replacement of SiO2 in ... more Germanium MOS transistors with high-k gates are good alternatives for the replacement of SiO2 in order to improve the performance of modern devices. Especially rare-earth oxides on germanium deposited by molecular beam deposition (MBD) have shown improved ...
This study aimed to determine hypertension prevalence and levels of awareness, treatment and cont... more This study aimed to determine hypertension prevalence and levels of awareness, treatment and control of hypertension among diabetic patients using data from the VANK study. The sample consisted of 221 men and women (122/99) diagnosed with type 2 diabetes. Semi-structured interviews were conducted with all participants. Controlled hypertension definition was based on having a systolic blood pressure (BP) of <130 mmHg and diastolic BP of <85 mmHg in subjects taking antihypertensive medications. The mean +/- SD BP was 141.6 +/- 17.4 mmHg and 81.2 +/- 9.4 mmHg for systolic and diastolic BPs, respectively. Systolic and diastolic BP was higher in men than in women. The overall prevalence of hypertension was 194/221 (87.7%). In total, 34.1% of patients (66/194) were not aware of having hypertension. Of those who were aware of having hypertension (n = 128, 65.9%), all were treated. Among those treated, only 11 persons (11/194, 5.6%) had systolic BP <130 mmHg and diastolic BP <85...
Out of 1705 patients hospitalised for various reasons in the 3rd Internal Medicine Department of ... more Out of 1705 patients hospitalised for various reasons in the 3rd Internal Medicine Department of the Regional General Hospital of Nikaea, in Piraeus, 146(8,5%) persons were admitted for drug intoxication between November 1999 and November 2000. On average, these persons [male 50(34,2%)--female 96(65,8%)] were admitted to the hospital within 3.7 hours after taking the drug. The drugs that were more frequently taken, alone or in combination with other drugs, were sedatives (67.1%), aspirins and analgesics (mainly paracetamol) (43.5%). 38.3% of patients had a mental illness history, 31.5% were in need of psychiatric help and 45.2% had made a previous suicide attempt. No death occurred during the above period and the outcome of the patients' health was normal. After mental state examination, the mental illnesses diagnosed were depression (20.96%), psychosis (15.32%), dysthymic disorder (16,2%), anxiety disorder (22.58%) and personality disorder (8.87%). Self-poisoning remains a cruc...
To examine trends in the prevalence of myocardial infarction (MI) and conventional risk factors i... more To examine trends in the prevalence of myocardial infarction (MI) and conventional risk factors in Greek adults between 2002 and 2006. Repeated cross-sectional study. Self-reported data from surveys given in Salamis during two election days in 2002 and 2006 were analysed. The same sampling method and procedures were used on both surveys. The study sample included 2805 and 3478 subjects (&gt; or =20 years) in 2002 and 2006, respectively, with similar age and sex distribution to the target population. The prevalence of MI increased from 4.1% (men, 6.3%; women, 1.9%) in 2002 to 4.8% (men, 7.3%; women, 2.2%) in 2006 (P = 0.18). At the same time, prevalence rates of major risk factors were as follows: diabetes increased from 8.7% to 10.3% (P = 0.037), hypertension from 20.1% to 25.7% (P &lt; 0.001) and hypercholesterolemia (cholesterol &gt;240 mg/dl or the use of cholesterol-lowering medication) increased from 17.5% to 22.3% (P &lt; 0.001). Prevalence of current smokers in 2002 (defined as persons who smoked &gt; or =5 cigarettes/day) was 37.0% and in 2006 (defined as those who smoked &gt; or =1 cigarettes/day) was 40.1%. Logistic regression analysis showed that the aforementioned risk factors were significantly associated with MI in both surveys; the factor that showed the greatest magnitude of association with MI was hypercholesterolemia, followed by diabetes, hypertension and smoking. These findings show that, in the Greek population, prevalence of MI continues to rise (at approximately 4% per year). This trend seems to be driven by a persistently high prevalence of smoking and the rapidly increasing burden of diabetes, hypertension and hypercholesterolemia.
ABSTRACT The molecular and atomic oxidation of molecular beam deposited Se passivating layers on ... more ABSTRACT The molecular and atomic oxidation of molecular beam deposited Se passivating layers on Ge substrates was in situ investigated by X-ray photoelectron spectroscopy. It turns out that while Se is efficient in suppressing Ge oxidation upon molecular oxygen exposure, an extra thin Al layer is needed to protect the Ge surface from highly reactive atomic oxygen radicals. Electrical measurements performed on the Al-covered surfaces reveal that Se is beneficial in reducing the interface state density.
We have performed the first structural study of formate adsorbed on Cu(111). The local registry o... more We have performed the first structural study of formate adsorbed on Cu(111). The local registry of formate has been determined using normal incidence X-ray standing wavefield absorption (NIXSW). The oxygen atoms of the formate were located in atop sites, with NIXSW measurements made using the (1̄11) planes suggesting that they could be statically displaced by up to 0.33Å, and with the formate bridging two copper atoms. This adsorption site is identical to that found for formate on Cu(110) and Cu(100) by Woodruff and co-workers. The oxygen–(111) plane separation determined by NIXSW was 1.89Å. This would, assuming that the oxygen atoms are displaced by 0.33Å from a perfect atop position and no relaxation of the underlying substrate, infer a upper limit for the CuO separation of 1.92±0.04Å. This value compares with CuO separations of 1.98±0.04Å for formate on both Cu(100) and Cu(110), and the average value of 1.97Å observed for all known μ2-formate–copper complexes.
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