An experimental study on flowrate and stability of a type of control valve of 600MW supercritical steam-turbine was presented by measuring instruments of static, dynamic pressure and vibration in self-designed test rig. The investigation shows that flow coefficient is 30% up more than that of the control valve of GX-1 type used widely in domestic power plants now, as small-medium lifts. If the relative lift (h/D) is less than 20%, the valve can always work steadily in all the pressure ratios. When the h/D is between 20% to 24%, big vibration of valve stem occurs if the pressure ratio is between 0.7 to 0.8. When h/D is more than 25%, relatively great vibration happens in a wide range of pressure ratios of 0.4 to 0.85.

Objective To determine sonographic features and outcome of fetal lung abnormal lesions. Methods Blood supply of the lesion, fetus hydrops and other extra-lung anomalies should be evaluated by color Doppler flow image(CDFI) when abnormal lesion was detected in fetus lung during routine scanning. The fetus with lung abnormal lesion without hydrops at the first time scanning should be monitored by ultrasound in every four to six weeks. Results Forty cases fetus presented lung abnormal lesions, which included 21 cases with hyperechogenic solid masses,15 cases with cystic-solid mixture masses,4 cases with cystic masses. Lesions of 8 cases were demonstrated systemic arterial blood supply arising from the aorta on CDFI and the diagnosis of pulmonary sequestration (PS) were suggested. Seventeen cases lesion that had small size or decreased or disappeared or remained stable in size with gestational age developing had normal neonate. Conclusions CDFI is very useful in detecting abnormal lesion of the fetal lung and differentiating pathology and evaluating the prognosis. The outcome of isolated lung lesion without hydrops and mediastinal shift that decreased or disappeared or remained stable in size had a good prognosis.

Objective To study the ultrasonic features and outcomes of VACTERL association fetuses. Methods From Jan 2003 to Sep 2013 in Shenzhen Maternity&Child Healthcare Hospital there were 55 fetuses diagnosed as VACTERL association, the prenatal ultrasonographic characteristics and outcomes were summarized. Results Ultrasonography showed that the incidence of 6 VACTERL association anomalies were:vertebral defects were 45.5%(25/55), anal atresia were 30.9%(46/55), cardiac malformations were 81.8%(45/55), tracheoesophageal ifstula/esophageal atresia were 32.7%(18/55), renal anomalies were 60.0%(33/55) and limb anomalies were 83.6%(17/55). All the 55 fetuses had 3 or more VACTERL association malformations and the characteristic ultrasonic features were as follows:(1) There were 39 cases (70.9%, 39/55) co-occur with three VACTERL malformations, the more common malformations were limb anomalies (33/39), cardiac malformations (31/39) and renal anomalies (21/39). (2) There were 13 cases (23.6%, 13/55) co-occur with four VACTERL malformations, the more common malformations were cardiac malformations (11/13), limb anomalies(10/13), renal anomalies (9/13) and tracheoesophageal ifstula/esophageal (8/13). (3) There were 3 cases (5.5%, 3/55) co-occur with ifve VACTERL malformations, they were all with anal atresia, cardiac malformations, renal anomalies and limb anomalies (3/3), and two were co-occur with vertebral defects (2/3). (4) No fetus co-occur with six VACTERL malformations. There were 29 cases (52.7%, 29/55) co-occur with other malformations, of which 21 cases (38.2%, 21/55) with single umbilical artery. All the 55 cases underwent labor induction. The results of postmortem appearance of 55 cases and autopsies of 9 cases were all consistent with prenatal ultrasound scan. Conclusions Fetuses with VACTERL association had characteristic prenatal ultrasound imaging, multiple malformations can be found and limb anomalies, cardiac malformations and renal anomalies are more common. Scanning the fetal structures from higher incidence to lower incidence of VACTERL association can be helpful to improve the diagnostic coincidence rate of VACTERL association. Prenatal ultrasound diagnosis of VACTERL association can provide guidance for clinical obstetrical management.

Objective To summarize and analyze prenatal ultrasound and postnatal autopsy ifndings in fetuses with urorectal septum malformation sequence (URSMS). Methods An analysis of prenatal ultrsound ifndings and postnatal autopsy features was performed on eleven cases of fetuses with URSMS that were identiifed by ultrasonography at Shenzhen Maternity&Child Healthcare Hospital in the period of January 2003 to December 2012. Results Prenatal ultrasonography showed a large abdominal cystic mass concomitant with imperforate anus in eleven fetuses with URSMS. The cyst contained unilocular or bilocular cystic structures in two fetuses, and trilocular cystic structures in nine fetuses. The cyst was demonstrated as clear acoustic transmission in three fetuses and unclear in eight fetuses. Out of them, seven fetuses had kidney abnormalities, six had ascites, and three had enterolithiasis. The associated systemic abnormalities included tethered cord in two fetuses, single umbilical artery in two fetuses, sacrococcygeal dysplasia in one fetus, and myocardial noncompaction in one fetus. 21-trisomy was found in one fetus by chromosome examination. Eleven cases were all identiifed as female fetuses by autopsy ifndings, including a single perineal opening and ambiguous genitalia with clitoral hypertrophy and labial fusion. The internal genital abnormalities included double vagina or longitudinal vaginal septum in nine fetuses, double uterus or uterus bicornis in ten fetuses and vaginal dysplasia in one fetus. Conclusions URSMS is a complex congenital malformation, which includes abnormalities of the urinary system, reproductive system and gastrointestinal track. An abdominal cystic mass visualized by prenatal ultrasonography might be the distinctive lesion in female with URSMS, and have an important diagnostic value. The kidney abnormalities and ambiguous genitalia can contribute to the diagnosis of URSMS.

ObjectiveTo summarize prenatal ultrasound image features of Cantrell′s syndrome (Cantrell′s pentalogy).MethodsFrom January 2007 to December 2013 in Shenzhen Maternity & Child Healthcare Hospital, there were twenty cases diagnosed and conifrmed by postmortem as Cantrell′s syndrome. The prenatal ultrasound image features and outcomes were analyzed.ResultsAmong the twenty cases, eighteen were singleton and two were twins with the other normal fetus. Prenatal ultrasound image: two obvious ultrasound image features of ectopic heart and hight omphalocele (seventeen cases) or gastroschisis (three cases) were appeared in prenatal ultrasound of twenty cases. Fourteen cases were complete ectopic heart (Ectopic heart was located within the omphalocele in one case, ectopic heart was completely exposed in amniotic lfuid in thirteen cases), six cases were incomplete ectopic heart, three cases were ventricular septal defect in which one was associated with pulmonary stenosis, two cases were single atrium and single ventricle in which one was associated with a single arterial trunk, one case was tetralogy of Fallot, and six cases were without signiifcant heart abnormalities. Associated with other abnormalities: seventeen cases were associated with other abnormalities in twenty cases, in which eleven cases were spinal abnormalities, nine cases were umbilical cord abnormalities (short umbilical cord in six cases, single umbilical artery in two cases, short umbilical cord associated with single umbilical artery in one case), ifve cases were neurological abnormalities (exencephalia in four cases, encephalocele in one case), four cases were limb abnormalities, three cases were cheilopalatognathus, one case was giant bladder. Three cases weren′t associated with other abnormalities. Nuchal Translucency: in eight cases, nuchal translucency were measured in early pregnancy. Nuchal translucency of ifve cases were thick, one case was cervical hygroma in one of the two twins. Chromosome examination results: only three cases had chromosome examination in twenty cases, in which one case was trisomy 21, another two were chromosome normal. Fetal outcome and examination results: in twenty cases, one of the two twins can′t survive after birth, and the other one of two twins was reduced in intrauterine, so the specimen could not be obtained. Eighteen cases of singleton underwent labor induction. The results of postmortem appearance (nineteen cases) and autopsies (ifve cases) were all consistent with prenatal ultrasound scan.ConclusionsEctopic heart and hight omphalocele or gastroschisis appearing at the same time was the characteristic of Cantrell′s syndrome in prenatal ultrasound and other abnormalities may be part of the Cantrell′s syndrome spectrum. It is beneift to detect and diagnose Cantrell′s syndrome by prenatal ultrasound in the ifrst trimester.

Objective To study the ultrasonographic clues and methods for fetal anomalies of the aorta arch and improve prenatal detection of anomalies of the aorta arch.Methods One thousand four hundred and seventy-two cases fetus who were carried out detailed scan and whose results were confirmed were chose as study objects.Every routine fetal echocardiography included four chamber and left and right outflow tract and three-vessel trachea view(3VT).The more views which included longitudinal and coronary view of the aorta arch and coronary view of the trachea and main bronchus were obtained when the abnormality of aorta arch was suspected.Results One hundred and forty-eight cases with anomalies of aorta arch were diagnosed by ultrasonography.One case was misdiagnosed.Ninety-two fetus with anomalies of aorta arch which included 28 aortic coarctation(CoA) and 10 interrupted aortic arch (IAA) and 52 right-side aortic arch and abnormal aortic branch and 2 double aortic arch were confirmed by postmortem or postnatal echocardiography and surgery.Of the 92 confirmed cases,24 had prenatally diagnosed additional complex intracardiac anomalies.All cases with CoA and IAA presented ventricular and/or great arterial disproportion with smaller left ventricle and aorta diameter on four chamber view and 3VT.Right aortic arch (RAA) and abnormal aortic branch(AAB) displayed aortic arch located on the right side of the trachea and increased distance between the aortic arch and arterial duct and abnormal aortic arch branch-subclavian artery originating from the beginning section of the descend aorta which coursed behind the trachea with U-shaped appearance on the 3VT plane.The display rate of the transverse and longitudinal and coronary view of the aorta arch was 98.4%,90.0%,81.9%,respectively.Conclusions Disproportional ventricular and /or great arterial with smaller left ventricle and aorta diameter are the clues for CoA and IAA.Increased distance between the aortic arch and arterial duct is the clue for RSA.The transverse view of the aortic arch 3VT is the most sensitive for detecting the anomalies of the aortic arch and the most easily be obtained.The longitudinal and coronary view of the aorta arch and coronary view of the trachea and main bronchus are helpful in differentiating the anomalies of the aortic arch.

Objective To investigate the clinical value of acoustic radiation forcs impulse (ARFI)in quantitative evaluating placental elasticity.Methods The study population included 487 normal pregnant women,and ARFI generated shear wave velocity (SWV)was measured.On the basis of gestational ages, placental sites and sampling depths in region of interest (ROI),the normal population was divided into different groups.One-way analysis of variance was used to compare the discrepancy on the SWV values amomg the nomal placental sites or the sampling depths in ROI.Pearson correlation coefficient were used to assess the possible relationships between the normal placental SWV values and the different gestational ages or the placental grades.A total of 5 1 cases were diagnosed with severe preeclampsia,among them 25 cases were categorized as severe preeclampsia with fetal growth restriction (FGR).The placental SWV values were measured and compared with those of the normal population.The pathological examinations were performed on 50 normal and 5 1 abnormal placentas.Results Basing on the placental sites,the normal population were divided into three groups:anterior wall,lateral wall and posterior wall groups.Compared with the posterior wall group,the placental SWV values in the anterior wall or lateral wall group significantly decreased (P <0.05).No statistical significant difference was found between the anterior wall group and the lateral wall group.Basing on the distance from the sampling depths to the probe (range from 2 to 7.99 cm,and each additional 1 cm corresponding a group),the normal population were divided into six groups.There was statistical significant difference for the placental SWV values between the two groups of distance in the range of 2.0 to 5.99 cm and 6.0 to 7.99 cm (P <0.05).There was no statistical significant difference between the other two groups.The mean SWV value was (0.78±0.08 m/s)in the normal group. No significant relationships were found between the placental SWV values and the gestational ages of the normal population.However the placental SWV values were significantly related to the placental grades.For the placental SWV values,there was statistical significant difference between the normal group and the abnormal group (P <0.05).No statistical significant difference was found between the severe preeclampsia group and the severe preeclampsia with FGR group.The pathological examinations also showed significant changes in the abnormal group.Conclusions ARFI may quantitatively analyze the placental elasticity and make a difference between nomal and abnormal placenta.

Objective To assess the value of prenatal sonographic diagnosis on fetal agenesis of corpus callosum(ACC). Methods A retrospective study was on prenatal sonographic findings of 10 cases with ACC malformation and their abnormalities in central nervous system (CNS) or extra-CNS.Results The special sonographic findings established the diagnosis of ACC malformation in all 10 cases,with 7cases diagnosed absence agenesis. Among all patients with ACC,6 cases were accompanied with abnormalities in extra-CNS,8 in CNS and 5 in both. Conclusions Prenatal ultrasonography plays a vital role in accurate diagnosis on fetal ACC. Attentions should be paid to the indirect encephalic features and complicated abnormalities so as to make accurate and prompt diagnosis.

Objective To evaluate the position of the fetal conus medullaris during pregnancy and its value in detecting tethered cord syndrome(TCS). Methods Nine hundred and seventy-four normal fetuses and 46 fetuses with TCS between 15 and 41 weeks gestation were involved in the study.Parameters D 1 (the distance between the end of the conus medullaris and the caudal edge of last vertebral body ossification center) and D2 (the distance from the end of the conus medullaris to the caudal skin namely the intersection point of the extending line of D1 and the skin) were measured in the caudal midsagittal plane of the spine. Sixty normal fetuses were chosed randomly for interobserver variability.Correlation analysis between these two parameters and gestational age(GA) were conducted and the normal reference value of these parameters were calculated in normal group. The ratios of growth parameters ( Biparietal diameter, Head circumference,Abdominal circumference,Femur length) to D1 and D2 were calculated separately to observe the difference of the ratios between two groups. All the parameters and ratios of normal fetuses were compared with that of TCS cases.Results There was no significant difference in D1 and D2 between two observers.A significant linear correlation between the parameters and GA was found in normal group,linear regression equations were D1=0.251 GA -2.265 cm (R2=0.926,P <0.01) and D2=0.267 GA -1.812 cm(R2=0.928,P <0.01),respectively.D1 and D2 were much lower in normal group than in abnormal group (all P <0.01). The ratios of the growth parameters to D1 and D2 were relatively stable and had statistically differences between two groups in different gestational age. Conclusions The methods that determination of D1 and D2 are simple and feasible,and could help to the prenatal diagnosis of TCS.

OBJECTIVETo study the relationship between sub-health status and the health-promoting lifestyle of employees.

METHODSA total of 5316 employees in a company in Guangdong were surveyed using sub-health measurement scale version 1.0 (SHMS V1.0) and the health-promoting lifestyle profile (HPLP-II). The former scale included 3 subscales of somatic sub-health, psychological sub-health and social sub-health, and the latter included 6 subscales of self-actualization, healthy responsibility, physical exercise, nutrition, interpersonal sensitivity and stress treatment.

RESULTSThe total healthy rate was 12.86% among the employees, with 76.76% and 10.5% in sub-health and disease states. The mean scores of HPLP-II was 115.95∓21.468 in the total population surveyed, 134.23∓24.72 in healthy employees and 114.69∓19.25 in the patients. There was a significant difference in the grades of health-promoting lifestyle between sub-healthy and healthy employees (P<0.05) as well as in the scores of HPLP-II and the scores of the 6 subscales (P<0.05). An appreciable correlation was found between sub-health status and the 6 subscales, and self-realization, physical exercise and stress management showed significant inverse correlation with sub-health status.

CONCLUSIONSub-health status is related to health-promoting lifestyle, and self-realization, physical exercise and management are the protective factors that influence sub-health status.

Adult ; Cross-Sectional Studies ; Female ; Health Behavior ; Health Promotion ; Health Status ; Humans ; Life Style ; Male ; Surveys and Questionnaires ; Young Adult