Title Participants Abstract "TEM investigation of the formation mechanism of deformation twins in Fe-Mn-Si-Al TWIP steels" "Hosni Idrissi, K. Renard, Nick Schryvers, P.J. Jacques" "The microstructure of a Fe-Mn-Si-Al twinning-induced plasticity (TWIP) steel exhibiting remarkable work hardening rate under uniaxial tensile deformation was investigated using transmission electron microscopy to uncover the mechanism(s) controlling the nucleation and growth of the mechanically induced twins. The results show that the stair-rod cross-slip deviation mechanism is necessary for the formation of the twins, while large extrinsic stacking faults homogenously distributed within the grains could act as preferential sources for the activation of the deviation process. The influence of such features on the thickness and strength of the twins and the resulting mechanical behaviour is discussed and compared to similar works recently performed on Fe-Mn-C TWIP steels." "On the mechanism of twin formation in FeMnC TWIP steels" "Hosni Idrissi, K. Renard, L. Ryelandt, Nick Schryvers, P.J. Jacques" "Although it is well known that FeMnC TWIP steels exhibit high work-hardening rates, the elementary twinning mechanisms controlling the plastic deformation of these steels have still not been characterized. The aim of the present study is to analyse the extended defects related to the twinning occurrence using transmission electron microscopy. Based on these observations, the very early stage of twin nucleation can be attributed to the pole mechanism with deviation proposed by Cohen and Weertman or to the model of Miura, Takamura and Narita, while the twin growth is controlled by the pole mechanism proposed by Venables. High densities of sessile Frank dislocations are observed within the twins at the early stage of deformation, which can affect the growth and the stability of the twins, but also the strength of these twins and their interactions with the gliding dislocations present in the matrix. This experimental evidence is discussed and compared to recent results in order to relate the defects analysis to the macroscopic behaviour of this category of material." "On the relationship between the twin internal structure and the work-hardening rate of TWIP steels" "Hosni Idrissi, K. Renard, Nick Schryvers, P.J. Jacques" "FeMnC and FeMnSiAl TWIP steels deformed under the same conditions exhibit different work-hardening rates. The present study investigates the microstructure of plastically deformed FeMnC and FeMnSiAl samples, particularly the internal structure of the mechanically generated twins and their topology at the grain scale. Twins in the FeMnC steel are finer and full of sessile dislocations, rendering this material distinctly stronger with an improved work-hardening rate." "Placental characteristics in monochorionic twins with and withour twin anemia-polycythernia sequence" "Jan Deprest" "OBJECTIVE: To study the placental angioarchitecture of monochorionic placentas with and without twin anemia-polycythemia sequence. METHODS: Eligible were all placentas from monochorionic twin gestations, not complicated by twin-to-twin transfusion syndrome and resulting in double survival. The study was conducted at two European Fetal Therapy Centers between 2002 and 2008. Placental angioarchitecture was evaluated using colored dye injection. Diagnosis of twin anemia-polycythemia sequence was based on the presence of large intertwin hemoglobin difference without the degree of amniotic fluid discordance that is required for the diagnosis of twin transfusion syndrome. RESULTS: Three-hundred thirteen monochorionic twin pregnancies were eligible for the study but placental data could not be completed for 62 placentas (20%). This left 251 monochorionic twin pregnancies of which 11 (4%) fulfilled the criteria for twin anemia-polycythemia sequence. The median number of anastomoses in monochorionic placentas with and without twin anemia-polycythemia sequence was 3 (range: 2-5) and 7 (range: 0-25), respectively (P" "Genetic and environmental effects on body mass index from infancy to the onset of adulthood: an individual-based pooled analysis of 45 twin cohorts participating in the COllaborative project of Development of Anthropometrical measures in Twins (CODATwins)" "Cathérine Derom, Robert Vlietinck" "Both genetic and environmental factors are known to affect body mass index (BMI), but detailed understanding of how their effects differ during childhood and adolescence is lacking." "Δικαστήριο της Ευρωπαϊκής Ένωσης (τμήμα μείζονος συνθέσεως) απόφαση της 25ης Ιουνίου 2020 στην υπόθεση C-24/19 - Σχόλιο" "Theodoros ILIOPOULOS, Haris Synodinos" "Artikelen 1bis, 3, 5, 5bis, 5ter, 6, 7, 10, 11 en 11bis Woninghuurwet" "Victor Godart" "Commentaar bij de artikelen 1bis, 5bis en 11bis woninghuurwet" "Maarten Dambre" "Twist Revisited: Twist Phenomena in Single Point Incremental Forming" "Hans Vanhove, Johan Verbert, Jun Gu, Ioannis Vasilakos, Philippe Eyckens" "Twist Revisited: Twist Phenomena in Single Point Incremental Forming" "Birth outcomes of twins after multifetal pregnancy reduction compared with primary twins" "Eline Meireson, Laura De Rycke, Esmee BIJNENS, Isabelle Dehaene, Sophie De Bock, Catherine Derom, Kristien Roelens" "BACKGROUND: The introduction of assisted reproductive technology and the trend of increasing maternal age at conception have contributed to a significant rise in the incidence of multiple pregnancies. Multiple pregnancies bear several inherent risks for both mother and child. These risks increase with plurality and type of chorionicity. Multifetal pregnancy reduction is the selective abortion of >= 1 fetuses to improve the outcome of the remaining fetus(es) by decreasing the risk of premature birth and other complications.OBJECTIVE: This study aimed to compare birth outcomes of trichorionic triplets reduced to twins with those of trichorionic triplets and primary dichorionic twins. The added value of this study is the comparison with an additional control group, namely primary dichorionic twins.STUDY DESIGN: This was a retrospective cohort study. Data from January 1990 to November 2016 were collected from the East Flanders Prospective Twin Survey, one of the largest European multiple birth registries. A total of 85 trichorionic triplet pregnancies (170 neonates) undergoing multifetal pregnancy reduction to twins were compared with 5093 primary dichorionic twin pregnancies (10,186 neonates) and 104 expec-tantly managed trichorionic triplet pregnancies (309 neonates). The assessed outcomes were gestational age at delivery, birthweight, and small for gestational age. 0.93-2.46; adjustment A triplets val, weeks;CONCLUSION: to tal able. gestation and tion,RESULTS: Pregnancy reduction from triplets to twins was associated with higher birthweight (+365.44 g; 95% confidence interval, 222.75-508.14 g; P"