In this paper we analyze a (1+3)-dimensional solution of relativistic hydrodynamics. We calculate momentum distribution and other observables from the solution and compare them to measurements from ...the Relativistic Heavy-Ion Collider (RHIC). We find that the solution we analyze is compatible with the data. In the last several years many numerical models were tested, but it is the first time that an exact, parametric, (1+3)-dimensional relativistic solution is compared to data.
Objective: Our aim was to determine which factors influence the effectiveness of intrauterine insemination.
Study Design: This article is a retrospective statistical analysis of outcomes of 9963 ...consecutive intrauterine insemination cycles.
Results: Patient age was the main determinant of pregnancy outcome (analysis of variance
F ratio = 29,
P < .0001), followed by the number of follicles at the time of intrauterine insemination (analysis of variance
F ratio = 9,
P < .0001) and sperm motility in the inseminate (analysis of variance
F ratio = 4,
P = .002). A total of 18.9% of all patients <26 years old conceived, compared with 13.9% of those 26-30 years old, 12.4% of those 31-35 years old, 11.1% of those 36-40 years old, 4.7% of those 41-45 years old, and 0.5% of patients >45 years old (
P < .001). When analyzed by single years, ongoing pregnancy rates after intrauterine insemination remained high through age 32 years. Across all ages and causes of infertility, 7.6% of patients with 1 follicle at the time of intrauterine insemination conceived, compared with 10.1% with 2, 14.0% with 4, and 16.9% with 6 follicles (
P < .01). When ovulation occurred before intrauterine insemination (ie, no visible follicular structures), 4.6% of patients conceived. The likelihood of pregnancy was maximized when motile sperm numbers were ≥4 million and sperm motility was ≥60%. Differences in pregnancy outcomes between sperm processing options were related to differences in sperm motility after processing; use of methods incorporating motility enhancement with pentoxifylline and motile sperm concentration through silica gradients yielded the highest overall pregnancy rates.
Conclusion: When the results of ongoing retrospective analysis of intrauterine insemination outcomes are applied, overall intrauterine insemination pregnancy rates have increased from 5.8% per cycle in 1991 to 13.4% per cycle in 1996, during which time the average age of patients undergoing intrauterine insemination has increased from 36.1 (±0.2) to 39.2 (±0.1) years. (Am J Obstet Gynecol 1999;180:1522-34.)
To determine how the type of embryo fragmentation on day 3 affects progression of human embryos to blastocyst and pregnancy rates following embryo transfer.
Retrospective analysis of all in vitro ...fertilization cycles in patients ≤40 years of age or younger from January 2002 through December 2003, during which time surplus day 3 embryos were transferred to blastocyst medium for extended culture. All embryos (4 cells or more) not suitable for transfer or freezing 72 hours following in vitro fertilization were placed into microdroplets (60 μL) of blastocyst medium and cultured for an additional 48 hours to assess blastocyst formation. Normal blastocyst development required blastulation, a visible inner-cell mass, trophectoderm cells covering 60% of the inner zona surface and thinning of the zona. The rate of blastocyst formation was then analyzed (χ
2 and analysis of variance) against the type of fragmentation 72 hours after insemination. Pregnancy outcomes were analyzed with respect to the pattern of fragmentation in cleaving embryos transferred after 3 days of culture.
A total of 1566 embryos were cultured beyond day 3 of development of which 229 (14.6%) reached the blastocyst stage and were frozen. Embryos exhibiting no fragmentation or type I fragmentation had significantly higher blastocyst development rates (27.9% and 19.9%) than embryos with type 2 or 3 fragmentation (13.9 and 8.8, respectively;
P < .001). No embryos with type 4 or 5 fragmentation progressed to blastocyst. The average type of fragmentation in transferred embryos correlated with pregnancy outcome and embryo age.
More pervasive embryo fragmentation was associated with a decreasing rate of blastocyst development with day 3 embryos. To the extent that blastocyst development rates of day 3 embryos is an index of embryo viability, our findings establish that careful classification of the type of embryo fragmentation is important in selection of day 3 embryos for transfer. Recent reports of associations among embryo fragmentation, aneuploidy, apoptosis, and patient age support these conclusions.
We present results of a search for two hypothetical strange dibaryon states, i.e. the H-dibaryon and the possible Λn‾ bound state. The search is performed with the ALICE detector in central (0–10%) ...Pb–Pb collisions at sNN=2.76 TeV, by invariant mass analysis in the decay modes Λn‾→d‾π+ and H-dibaryon →Λpπ−. No evidence for these bound states is observed. Upper limits are determined at 99% confidence level for a wide range of lifetimes and for the full range of branching ratios. The results are compared to thermal, coalescence and hybrid UrQMD model expectations, which describe correctly the production of other loosely bound states, like the deuteron and the hypertriton.
The PHENIX experiment has measured the spin alignment for inclusive J=ψ → e+e− decays in protonproton collisions at √s = 510 GeV at midrapidity. The angular distributions have been measured in three ...different polarization frames, and the three decay angular coefficients have been extracted in a full two-dimensional analysis. Previously, PHENIX saw large longitudinal net polarization at forward rapidity at the same collision energy. This analysis at midrapidity, complementary to the previous PHENIX results, sees no sizable polarization in the measured transverse momentum range of 0.0 < pT < 10.0 GeV=c. The results are consistent with a previous one-dimensional analysis at midrapidity at √s = 200 GeV. The transverse-momentum-dependent cross section for midrapidity J=ψ production has additionally been measured, and after comparison to world data, a simple logarithmic dependence of the cross section on √s was found.
To determine whether elements of treatment associated with faster doubling times of total β-hCG in serum (β-t2) in pregnant patients are also associated with a higher likelihood of pregnancy in all ...patients.
Retrospective analysis of β-t2 values, elements of ovarian stimulation (COH), and outcomes.
Private assisted reproductive technology (ART) center.
Initial analysis of data from 432 cycles in which conception occurred after COH and embryo transfer, followed by analysis of pregnancy outcomes after 1,287 cycles of COH/ embryo transfer.
No interventions.
The β-t2 values initially computed from consecutive serum β-hCG levels in ongoing pregnancies were correlated with multiple properties of the patients and their treatment cycles.
The β-t2 values during early pregnancy increased exponentially from about 1.6 days at 12 days to about 3.0 days at 24 days after embryo transfer. In those pregnancies which spontaneously aborted, early average β-t2 values were higher than those for ongoing pregnancies; absolute β-hCG levels did not differ. Positive correlations were established between β-t2 values, the number of days of stimulation, and the number of ampules of drug administered per oocyte retrieved. The β-t2 values were inversely related to average numbers of blastomeres in transferred embryos. Ongoing pregnancy rates (PR) were higher for cycles with lower gonadotropin dosages per oocyte retrieved, and when the average number of blastomeres in transferred embryos was higher.
Steeper β-hCG doubling times in early pregnancy were associated with lower gonadotropin dosages during ovarian stimulation and with higher numbers of blastomeres in transferred embryos. The latter variables were, in turn, associated with a higher likelihood of pregnancy after embryo transfer.
To aid in the clinical decision making involved with persistent ectopic gestation, a total of 329 operative procedures for tubal gestation were reviewed. Six of 114 (5.3%) cases treated ...conservatively had persistent trophoblastic activity. The decline in serum β-human chorionic gonadotropin (hCG) and progesterone (P) at 3 and 6days postoperatively was similar in the “persistent ectopic” and the “resolved ectopic” groups. However, beyond day 6 both β-hCG percentage of baseline and P level were significantly higher in the “persistent ectopic” (>22.6±6.6%, >3.4±0.7ng/ml, respectively) than the “resolved ectopic” group (<2.7±0.8%, <0.2±0.05ng/ml, respectively). Four patients underwent a second operation, whereas two were managed expectantly. These data suggest that the diagnosis of persistent ectopic gestation is best made by an initial measurement of serum β-hCG or P at 6days postoperatively, and at 3day intervals thereafter. The choice of management may be determined by various factors including serum β-hCG and patient s symptoms.
The azimuthal correlations of D mesons with charged particles were measured with the ALICE apparatus in pp collisions at Formula: see text and p-Pb collisions at Formula: see text at the Large Hadron ...Collider. Formula: see text, Formula: see text, and Formula: see text mesons and their charge conjugates with transverse momentum Formula: see text and rapidity in the nucleon-nucleon centre-of-mass system Formula: see text (pp collisions) and Formula: see text (p-Pb collisions) were correlated to charged particles with Formula: see text. The yield of charged particles in the correlation peak induced by the jet containing the D meson and the peak width are compatible within uncertainties in the two collision systems. The data are described within uncertainties by Monte-Carlo simulations based on PYTHIA, POWHEG, and EPOS 3 event generators.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
The azimuthal correlations of D mesons with charged particles were measured with the ALICE apparatus in pp collisions at s=7TeV and p–Pb collisions at sNN=5.02TeV at the Large Hadron Collider. D0, ...D+, and D∗+ mesons and their charge conjugates with transverse momentum 3<pT<16GeV/c and rapidity in the nucleon-nucleon centre-of-mass system |ycms|<0.5 (pp collisions) and -0.96<ycms<0.04 (p–Pb collisions) were correlated to charged particles with pT>0.3GeV/c. The yield of charged particles in the correlation peak induced by the jet containing the D meson and the peak width are compatible within uncertainties in the two collision systems. The data are described within uncertainties by Monte-Carlo simulations based on PYTHIA, POWHEG, and EPOS 3 event generators.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
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