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  • 1
    Publication Date: 2017-04-04
    Description: Mud volcanoes (MVs) are considered important methane (CH4) sources for the atmosphere; gas is not only released from macro-seepage, i.e., from craters and visible gas bubbling manifestations, but also from invisible and pervasive exhalation from the ground, named miniseepage. CH4 flux related to miniseepage was measured only in a few MVs, in Azerbaijan, Italy, Japan, Romania and Taiwan. This study examines in detail the flux data acquired in 5 MVs and 1 ‘‘dry’’ seep in SW Taiwan, and further compares with other 23 MVs in Italy, Romania and Azerbaijan. Miniseepage from the six manifestations in SW Taiwan MVs and seeps annually contribute at least 110 tons of methane directly to the atmosphere, and represents about 80% of total degassing during a quiescent period. Combining miniseepage flux and geo-electrical data from the Wu-shan-ding MV revealed a possible link between gas flux and electrical resistivity of the vadose zone. This suggests that unsaturated subsoil is a preferential zone for shallow gas accumulation and seepage to the atmosphere. Besides, miniseepage flux in Chu-huo everlasting fire decreases by increasing the distance from the main gas channeling zone and molecular fractionation (methane/ethane ratio) is higher for lower flux seepage, consistently with what observed in other MVs worldwide. Measurements from Azerbaijan, Italy, Romania, and Taiwan converge to indicate that miniseepage is directly proportional to the vent output and it is a significant component of the total methane budget of a MV. A miniseepage vs. macro-seepage flux equation has been statistically assessed and it can be used to estimate theoretically at least the order of magnitude of the flux of miniseepage for MVs of which only the flux from vents was evaluated, or will be evaluated in future. This will allow a more complete and objective quantification of gas emission in MVs, thus also refining the estimate of the global methane emission from geological sources.
    Description: Published
    Description: 3–12
    Description: 4.5. Studi sul degassamento naturale e sui gas petroliferi
    Description: JCR Journal
    Description: restricted
    Keywords: Mud volcano ; Miniseepage ; Macro-seepage ; Global methane emission ; 04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pediatric surgery international 13 (1998), S. 232-236 
    ISSN: 1437-9813
    Keywords: Key words Intussusception ; Intestinal atresia ; Necrotizing enterocolitis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Intussusception found in the 1st month of life is rare and usually discussed as one entity, neonatal intussusception, but in fact, includes the intussusceptions occurring both prenatally and neonatally, of which the clinical presentations and results are different. Four full-term babies with prenatal intussusception presenting as intestinal atresia (IA) and three premature babies with neonatal intussusception mimicking necrotizing enterocolitis (NEC) are presented. Prenatal intussusception, as one of the causes of IA produces prominent signs of intestinal obstruction immediately after birth. Preoperative evaluation usually fails to yield a definitive diagnosis, but surgery is usually performed in time and is successful. In neonatal intussusception, full-term infants usually have a pathological lead point and the colon is almost always involved. A barium enema is thus useful in diagnosis. Premature babies, on the other hand, rarely have a colonic component, and the clinical features are insidious and similar to NEC. This results in diagnostic confusion that may lead to a dangerous delay in appropriate surgical correction. A high level of suspicion about this condition in cases diagnosed presumptively with NEC is important. Serial abdominal sonograms may be helpful in the early diagnosis of neonatal intussusception.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1437-9813
    Keywords: Key words Vesicoureteral reflux ; Ureteral reimplantation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract From January 1990 to December 1995, a total of 181 patients underwent reimplantation of 318 ureters for primary vesicoureteral reflux (VUR); 87.8% received bilateral reimplantation. Surgical indications included breakthrough infection (35%), high-grade (≥IV) reflux (33%), or both (29%). The operative success rate was 99.4% at 3 months postoperatively and 100% ultimately. The complications included: contralateral sequential reflux in 3.9%, postoperative bladder diverticula in 1.1%, postoperative urinary infection in 1.1%, residual reflux in 0.3%, postoperative vesicoureteral stenosis in 0.3%, and slippage of the drainage tube in 0.3% of cases. Two patients had renal failure due to VUR that was proven by renal biopsy (one 4-year-old and one 8-year-old). The incidence of associated anomalies was higher than in the normal population. The average number of hospital admission days was 7.9 (3–63). After 1992, no ureteral stent was left in postoperatively. All patients received prophylactic antibiotics for 3 months postoperatively until the VUR disappeared. The surgical results were satisfactory in this series.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Pediatric surgery international 13 (1998), S. 501-503 
    ISSN: 1437-9813
    Keywords: Key words Primary megaureter ; Ureterovesical junction obstruction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract From January 1990 to December 1995, a total of 22 patients with primary non-refluxing megaureter were treated in our hospital. The age distribution was 7 days to 8 years. The follow-up period was from 1 to 6 years. Nineteen of these 22 children underwent surgical intervention: 3 were operated upon at the time of diagnosis; the other 16 were initially treated conservatively, but underwent subsequent surgery due to impairment of renal function (13) or breakthrough infections (3). The failure rate for conservative management was about 84% (16/19): only 3 patients treated conservatively showed spontaneous resolution. The surgical success rate was 89.5% (17/19). The pathological change in the ureterovesical junction (UVJ) was adynamic in 13 cases and fibrotic in 6 (including 1 ectopic ureter). The postoperative complications were vesicoureteric reflux in 3 cases, with spontaneous resolution 6 months later, and UVJ stenosis in 1, which was resolved by reoperation. It is concluded that surgery is not necessary in every case, but still plays an important role in most cases. Early surgery can achieve good results and reduce renal damage.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    International archives of occupational and environmental health 59 (1987), S. 529-536 
    ISSN: 1432-1246
    Keywords: Steel mill workers ; Noise-induced hearing loss ; Blood pressure ; Multiple regression ; Analysis of covariance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A cross-sectional study on noise-induced hearing loss and blood pressure was conducted in a steel mill company. Three hundred testees were selected by cluster sampling. They were physically examined and an audiometry was done. Only 151 workers, who had the highest hearing threshold at 4000 Hz and without any family history of hypertension or treatment of drugs on cardiovascular troubles, were selected as subjects in this study. Multiple regression analyses revealed that body mass index, employment duration, age and hearing loss explained a significant amount of variation in systolic and diastolic blood pressure (R 2 = 0.16 and 0.12, respectively). There was no significant relationship between hearing loss and blood pressure. In order to adjust confounding factors, analyses of covariances were used and the results suggest that hearing loss is unrelated to blood pressure. It seems that hearing loss is not appropriate as a noise exposure index to measure the relationship between noise exposure and blood pressure.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-1246
    Keywords: Key words Blood lead level (BLL) ; Surveillance ; Occupational health ; Field survey ; PRESS-BLLs project
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  To monitor the lead hazards in industries and to investigate the prevalence of elevated blood lead levels (BLLs) in lead-exposed workers, a lead surveillance system (PRESS-BLLs) has been established and operated in Taiwan, Republic of China, since July 1993. A cohort of lead-exposed workers who received a periodic annual health examination at 55 accredited hospital laboratories was constructed. A total of 9807 separate BLL measurements were reported to the system in 1994. The mean BLL was 15.8 μg/dl in male workers and 11.6 μg/dl in female workers. The mean BLL of lead-exposed workers was significantly (P〈0.05, z-test) higher than that of the general Taiwanese population (8.6 μg/dl for males and 6.7 μg/dl for females). In addition, the BLLs of 983 (10.0%) workers exceeded the regulatory action level (40 μg/dl for males; 30 μg/dl for females). The workplaces and homes of 57% of the workers with elevated BLLs were thoroughly investigated to determine the sources of lead contamination. These actions identified the causes of elevated BLLs and set up strategies to reduce workers’ lead exposure. The establishment of this occupational lead surveillance system represents a method for monitoring of lead hazards from occupational and environmental settings to prevent lead poisoning. The information acquired from the system can help in the setting up of a priority of prevention and the development of control measures. It is also useful for further monitoring of changes in the BLLs of the lead-exposed-worker cohort. The Health Department of Taiwan can use this information to evaluate the effectiveness of current industrial hygiene practice. Subjects with elevated BLLs have been medically treated and placed on long-term follow-up for sequelae.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    International archives of occupational and environmental health 69 (1997), S. 295-300 
    ISSN: 1432-1246
    Keywords: Key words Ambient lead level ; Blood lead level ; Lead battery factory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective: To examine the relationship between ambient lead levels and blood lead levels and to explore the modifiers of the relationship between ambient lead and blood lead. Method: A cross-sectional study was conducted in two lead battery factories. Blood lead level and ambient lead concentration were measured for each participant concurrently. A structured questionnaire was administered to collect sociodemographic characteristics and occupational history. Design: Biological and personal environmental measurements of 219 lead-exposed workers were analyzed by both simple and multiple linear regression. A regression model was selected for interpretation. Results: A high correlation (r=0.62) between ambient lead (PbA) and blood lead (PbB) was observed. In addition, numerous factors, including age, sex, alcohol consumption, personal hygiene practice and type of lead exposure, were also found to influence blood lead levels. Although PbB was highly correlated with PbA, blood lead level may not be effectively lowered by reducing ambient lead level. Based on the regression coefficients, improvement of hygienic practice was more effective at lowering PbB than reducing ambient lead level. Good hygienic practice may be the preferential way to reduce lead exposure in current conditions. Conclusion: Education of correct work practice may be more important than engineering control in the developing countries to lower blood lead levels in lead battery factories.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    European journal of epidemiology 14 (1998), S. 775-781 
    ISSN: 1573-7284
    Keywords: High blood lead ; Risk factors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Purpose: Environmental and occupational lead pollution is a common problem in both developing and industrialized countries. The purpose of this study is to evaluate the risk factors for high blood lead levels among the general population in Taiwan. Methods: After multi-stage sampling, we randomly selected 2803 subjects (1471 males and 1332 females) for this study. Univariate and multivariate logistic regression analyses were conducted to evaluate the risk of high blood lead. To control for differences in age and gender, all analyses were with age-adjusted and gender-stratified. Results: Among males, the mean age is 46 years (15 to 85 years), mean and median blood lead levels is 7.3 and 6.3μg/dl, respectively. Among females, the mean age is 43 years (15 to 84 years), mean and median blood lead level is 5.7 and 4.8μg/dl, respectively. Among males, the history of herbal drug use, drinking water from well or spring sources, and occupational lead exposure are significantly different between relatively high and normal blood lead level subjects. The history of occupational lead exposure, history of herbal drug use, and well or spring sources of drinking water are the major risk factors for high blood lead with odds ratio of 4.62 (95% CI: 2.82–7.55), 3.09 (95% CI: 1.60–5.97), 2.06 (95% CI: 1.13–3.76), and 2.37 (95% CI: 1.39–4.04), respectively. Among females, these characteristics remain important except the sources of drinking water. The history of herbal drug use and occupational lead exposure become the major risk factors for high blood lead with odds ratio of 2.94 (95% CI: 1.26–6.88) and 7.72 (95% CI: 3.51–16.99), respectively. In multivariate logistic regression analyses, we find that the risk factors for high blood lead in both genders include a history of herbal drug use and occupational lead exposure. Among males, the drinking water sources and factories in the neighboring areas are also significant factors for high blood lead. Conclusions: For the goal of reducing prevalence of high blood lead by the year 2000, the improvement and monitoring of the working environment, the careful attention to herbal drug use and the lead-free drinking water sources should be executed as thoroughly as possible to reduce the probability of lead pollution.
    Type of Medium: Electronic Resource
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  • 9
    Publication Date: 2014-04-04
    Description: Double-difference seismic tomography can estimate velocity structure and event locations with high precision, but its high-computation cost along with large memory usage prevents the use of a personal computer to process very large datasets and requires a long-computation time. This work proposes graphics-processing-unit- (GPU)-based acceleration schemes to run the algorithm on a personal computer for very large datasets more efficiently. Generally, the algorithm can be divided into five major steps: input, ray tracing, matrix construction, inversion, and output. This work focuses on accelerating the ray-tracing and inversion steps, which take almost two-thirds of the computation time. Before ray tracing, our algorithm preprocesses the data by sorting all recorded event–station paths according to their lengths. Therefore, those path estimation jobs assigned to GPU cores are suitable for the GPU architecture. Furthermore, our work also minimizes the usage of global and local memory to reduce the GPU computing time needed to handle a very large dataset. In addition to parallelizing the inversion computation, our work proposes a GPU-based elimination method to reduce redundant computation in inversion for further acceleration. In our test, the proposed acceleration schemes can gain maximum speed-up factors of 31.17 and 35.46 for ray tracing and inversion, respectively, in our test. Overall, the GPU-based implementation can reach a maximum of 5.98 times faster than the central processing unit-based implementation.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
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  • 10
    Publication Date: 2017-03-28
    Description: Objectives This study investigated the prevalence and correlates of electronic cigarettes (e-cigarettes) use in Taiwan. Design and setting We studied a nationally representative random sample in the 2015 Taiwan Adult Smoking Behavior Survey. Participants This study included 26 021 participants aged 15 years or older (51% women, 79% non-smokers, 16% aged 15–24 years), after excluding 31 persons (0.1%) who had missing information on e-cigarette use. Primary outcome measures The prevalence of ever having used e-cigarettes was calculated in the overall sample and by smoking status (current, former and never) or age (15–24, 25–44 and ≥45 years). We performed multivariable log-binomial regression to assess correlates of ever having used e-cigarettes among all participants and separately for subgroups by smoking status and age. Results Approximately 3% of all participants had ever used e-cigarettes. The prevalence of ever having used e-cigarettes was high in current smokers (14%) and people aged 18–24 years (7%). E-cigarette use was particularly common in people aged 15–24 years who were current (49–52%) or former (22–39%) smokers. Ever having used e-cigarettes was positively associated with tobacco smoking (adjusted prevalence ratio (aPR): 21.5, 95% CI 15.4 to 29.8, current smokers; aPR: 8.3, 95% CI 15.2 to 13.1, former smokers), younger age and high socioeconomic status. Age remained a significant factor of ever having used e-cigarettes across smoking status groups. Among non-smokers, men had a 2.4-fold (95% CI 1.5 to 3.8) greater prevalence of e-cigarette use than women. Conclusions E-cigarette use was uncommon in the general population in Taiwan, but prevalence was high among smokers and young people. This study highlights challenges that e-cigarettes pose to tobacco control, which warrant high priority action by policymakers and public health professionals. E-cigarette regulations should focus on young people.
    Keywords: Open access, Health policy, Public health, Smoking and tobacco
    Electronic ISSN: 2044-6055
    Topics: Medicine
    Published by BMJ Publishing
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