233 research outputs found
Possible Medical Aetiological Factors and Characteristics of Molar Incisor Hypomineralisation in a Group of Turkish Children
Svrha: Željele su se odrediti kliniÄke znaÄajke i moguÄi medicinski uzroci molarno incizivne hipominerelizacije (MIH-a) u skupini turske djece. Materijali i metode: U ispitivanju je sudjelovalo 228 djece u dobi od 7 do 14 godina. Svi su pregledani na Odjelu za djeÄju dentalnu medicinu StomatoloÅ”kog fakulteta SveuÄiliÅ”ta Marmara u Istambulu. Prenatalni i postnatalni podatci prikupljeni su popunjavanjem upitnika. Rezultati: MIH je pronaÄen kod 54 (24 %) djeteta, a 41 (76 %) imalo je samo ograniÄena podruÄja opaciteta (1. stupanj). Kod osam (15%) djevojÄica i djeÄaka bile su obavljene atipiÄne restauracije (2. stupanj), a barem jedno posteruptivno ljuÅ”tenje (3. stupanj) uoÄeno je kod njih pet (9 %). MIH je svima uglavnom zahvaÄao kutnjake (55 %), a ne sjekutiÄe (45 %; p<0,001). U skupini s MIH-om bili su Äesti prenatalni bronhitis i hipertenzija. Nije bilo veÄe razlike u medicinskoj anamnezi do dobi od tri godine izmeÄu skupine s MIH-om i skupine bez njega, osim duljeg uzimanja lijekova i astme u skupini s molarno incizalnom hipomineralizacijom (p<0,05). ZakljuÄak: Premda etiologija MIH-a ostaje nejasna, Äest je kod djece koja neprekidno uzimaju lijekove i oboljela su od astme u prve tri godine života.Objective: To determine the clinical characteristics and possible medical causes of molar incisor hypomineralisation (MIH) in a group of Turkish children. Materials and Methods: A total of 228 children aged 7ā14 years were examined in the Department of Paediatric Dentistry Dental School of Marmara University. Prenatal and postnatal medical data were recorded using a questionnaire. Results: MIH was observed in 54 (24%) children, 41 (76%) of whom had only demarcated opacities (grade 1). Eight (15%) children had atypical restoration (grade 2), and at least one post-eruptive breakdown (grade 3) was observed in five (9%) children. MIH affected molars (55%) more frequently than incisors (45%; P < 0.001). Prenatal bronchitis and hypertension were frequent in the MIH group. No significant difference in medical history during the first 3 years of life was observed between the MIH and non-MIH groups, except prolonged medicament consumption and asthma in the MIH group (P < 0.05). Conclusion: Although the aetiology of MIH remains unclear, constant medicament consumption and asthma during the first 3 years of life were reported frequently in children with MIH
Effect of Wood-derived Charcoal Content on Properties of Wood Plastic Composites
The effect of wood-derived charcoal flour on the water resistance and mechanical properties of wood plastic composite (WPC) panels was investigated. The hot press molded WPC panels were produced from polypropylene (37 wt%) with maleic anhydride-grafted polypropylene (MAPP, 3 wt%) and different mixtures of wood flour and charcoal flour. The amount of charcoal flour was gradually increased up to 60 wt%. The thickness swelling and water absorption of WPC panels considerably decreased with increasing charcoal flour content. The internal bond strength and bending properties of the WPC panels significantly improved with increasing charcoal flour content. This was mainly attributed to the high amount of pores and gaps in the charcoal flour. Melted polypropylene could get into the pores and gaps during the hot press molding, which lead to a better interfacial adhesion between polymer matrix and wood filler. The results showed that the charcoal flour could be partially substituted for the wood flour in the production of WPC panels having higher dimensional stability and internal bond strength
The Klein-Gordon equation with the Kratzer potential in d dimensions
We apply the Asymptotic Iteration Method to obtain the bound-state energy
spectrum for the d-dimensional Klein-Gordon equation with scalar S(r) and
vector potentials V(r). When S(r) and V(r) are both Coulombic, we obtain all
the exact solutions; when the potentials are both of Kratzer type, we obtain
all the exact solutions for S(r)=V(r); if S(r) > V(r) we obtain exact solutions
under certain constraints on the potential parameters: in this case, a possible
general solution is found in terms of a monic polynomial, whose coefficients
form a set of elementary symmetric polynomials.Comment: 13 page
Search for the Bs0 ā Ī¼+Ī¼āĪ³ decay
A search for the fully reconstructed B0
s ā Āµ
+Āµ
āĪ³ decay is performed at the LHCb
experiment using proton-proton collisions at ā
s = 13 TeV corresponding to an integrated
luminosity of 5.4 fbā1
. No signifcant signal is found and upper limits on the branching
fraction in intervals of the dimuon mass are set
B(B
0
s ā Āµ
+Āµ
āĪ³) < 4.2 Ć 10ā8
, m(Āµ
+Āµ
ā) ā [2mĀµ, 1.70] GeV/c2
,
B(B
0
s ā Āµ
+Āµ
āĪ³) < 7.7 Ć 10ā8
, m(Āµ
+Āµ
ā) ā [1.70, 2.88] GeV/c2
,
B(B
0
s ā Āµ
+Āµ
āĪ³) < 4.2 Ć 10ā8
, m(Āµ
+Āµ
ā) ā [3.92, mB0
s
] GeV/c2
,
at 95% confdence level. Additionally, upper limits are set on the branching fraction in the
[2mĀµ, 1.70] GeV/c2 dimuon mass region excluding the contribution from the intermediate
Ļ(1020) meson, and in the region combining all dimuon-mass intervals
Observation of the Bc+ ā J/ĻĻ+Ļ0 decay
The first observation of the Bc+āJ/ĻĻ+Ļ0 decay is reported with high significance using proton-proton collision data, corresponding to an integrated luminosity of 9 fbā1, collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV. The ratio of its branching fraction relative to the Bc+āJ/ĻĻ+ channel is measured to beBBc+āJ/ĻĻ+Ļ0BBc+āJ/ĻĻ+=2.80Ā±0.15Ā±0.11Ā±0.16, where the first uncertainty is statistical, the second systematic and the third related to imprecise knowledge of the branching fractions for B+ ā J/ĻK*+ and Bc+āJ/ĻĻ+ decays, which are used to determine the Ļ0 detection efficiency. The Ļ+Ļ0 mass spectrum is found to be consistent with the dominance of an intermediate Ļ+ contribution in accordance with a model based on QCD factorisation
Study of b-hadron decays to Īc^+h-h' final states
Decays of Ī
ā
b
and ā¦
ā
b
baryons to Ī
+
c h
āh
ā²ā final states, with h
āh
ā²ā being
Ļ
āĻ
ā, KāĻ\ud
ā and KāKā meson pairs, are searched for using data collected with the LHCb
detector. The data sample studied corresponds to an integrated luminosity of 8.7 fbā1
of
pp collisions collected at centre-of-mass energies ā
s = 7, 8 and 13 TeV. The products of
the relative branching fractions and fragmentation fractions for each signal mode, relative
to the Bā ā Ī
+
c pĻā mode, are measured, with Ī
ā
b ā Ī
+
c KāĻ
ā, Ī
ā
b ā Ī
+
c KāKā and
ā¦
ā
b ā Ī
+
c KāKā decays being observed at over 5 Ļ significance. The Ī
ā
b ā Ī
+
c KāĻ
ā mode
is also used to measure the Ī
ā
b
production asymmetry, which is found to be consistent with
zero. In addition, the Bā ā Ī
+
c pKā decay is observed for the first time, and its branching
fraction is measured relative to that of the Bā ā Ī
+
c pĻā mode
- ā¦