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"Lin, Qingping"
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Sintering Characteristics and Microwave Dielectric Properties of BaTi4O9 Ceramics with CuO–TiO2 Addition
Sintering characteristics, phase evolutions, microstructures, and microwave dielectric properties have been investigated for BaTi4O9 ceramics prepared by traditional low temperature sintering using CuO–TiO2 (CT) additions as aids. The sintering temperature of BaTi4O9 ceramics was found to evidently reduce from 1350 °C to about 1100 °C with a very small amount of 0.5 wt% CT addition. When the CT addition increased to beyond 0.5 wt%, however, it was not expected to further lower the sintering temperature. Meantime, the secondary phases of Ba4Ti13O30, BaTiO3, and TiO2 were observed in these BaTi4O9-based ceramics when the CT content was beyond 2 wt%. With the introduction of the CT addition, the permittivity (ε) had little enhancement, and the temperature coefficient of the resonant frequency (τf) was improved to near zero. The BaTi4O9 ceramics with 0.5 wt% CT additions, sintered at 1100 °C, exhibited excellent microwave dielectric properties, such as ε = 36.9, Q × f = 23100 GHz, and τf = 2.5 ppm/°C. In addition, the densification mechanism and variations of the microwave dielectric properties have also been discussed with the crystal phase and microstructure’s evolution.
Journal Article
Temporary Ligation of the Bilateral Uterine Arteries During Laparoscopy Combined with Hysteroscopy in the Treatment of Caesarean Scar Pregnancy: Experience at a Chinese Teaching Hospital
This study aimed to investigate the clinical efficacy of temporary ligation of the bilateral uterine arteries during laparoscopy combined with hysteroscopy in the treatment of caesarean scar pregnancy (CSP).
This study was a retrospective analysis of 83 patients who had initially undergone laparoscopy combined with hysteroscopy for CSP between 2012 and 2018 at Xiamen Women and Children's Hospital. Patients were assigned to the ligation group or the no ligation group according to whether they underwent temporary ligation of the bilateral uterine arteries. Factors extracted from the database included general preoperative information, surgical indicators (intraoperative blood loss, operation time, and blood transfusion), postoperative recovery indicators (β-hCG on day 3 after surgery, time to β-hCG normalization), and postoperative complications (decrease in menstrual bleeding, alteration in the menstrual cycle) and were compared between the two groups.
The intraoperative blood loss of patients in the ligation group was significantly less than that of patients in the no ligation group (P=0.027), especially in patients with higher serum β-hCG level (P=0.030). No significant differences in the operation time, blood transfusion, decline ratio of hCG on day 3 after surgery, reduction in haemoglobin and haematocrit value, decrease in menstrual bleeding, or alteration in the menstrual cycle were observed between the two groups (P>0.05).
For CSP patients, temporary ligation of the bilateral uterine arteries during laparoscopy combined with hysteroscopy achieved better clinical outcomes than laparoscopy combined with hysteroscopy without ligation with respect to intraoperative blood loss. This approach offers effective and safe surgical management for CSP in clinical practice.
Journal Article
Expression and purification the antimicrobial peptide CM4 in Escherichia coli
The antimicrobial peptide CM4 is a 35-residue cationic peptide. To explore a new approach for the expression and purification of CM4 in Escherichia coli, the CM4 gene was cloned into the vector pET32a to construct an expression vector pET32a-CM4. The fusion protein Trx-CM4, purified by Ni²⁺-chelating chromatography, was cleaved by hydroxylamine hydrochloride to release recombinant CM4. Purification of recombinant CM4 was achieved by reverse HPLC chromatography, and about 1.4 mg/l active recombinant CM4 with the purity more than 98% was obtained. The recombinant CM4 showed antimicrobial activities that were similar to synthetic one.
Journal Article
Sintering Characteristics and Microwave Dielectric Properties of BaTisub.4Osub.9 Ceramics with CuO–TiOsub.2 Addition
Sintering characteristics, phase evolutions, microstructures, and microwave dielectric properties have been investigated for BaTi[sub.4]O[sub.9] ceramics prepared by traditional low temperature sintering using CuO–TiO[sub.2] (CT) additions as aids. The sintering temperature of BaTi[sub.4]O[sub.9] ceramics was found to evidently reduce from 1350 °C to about 1100 °C with a very small amount of 0.5 wt% CT addition. When the CT addition increased to beyond 0.5 wt%, however, it was not expected to further lower the sintering temperature. Meantime, the secondary phases of Ba[sub.4]Ti[sub.13]O[sub.30], BaTiO[sub.3], and TiO[sub.2] were observed in these BaTi[sub.4]O[sub.9]-based ceramics when the CT content was beyond 2 wt%. With the introduction of the CT addition, the permittivity (ε) had little enhancement, and the temperature coefficient of the resonant frequency (τ[sub.f]) was improved to near zero. The BaTi[sub.4]O[sub.9] ceramics with 0.5 wt% CT additions, sintered at 1100 °C, exhibited excellent microwave dielectric properties, such as ε = 36.9, Q × f = 23100 GHz, and τ[sub.f] = 2.5 ppm/°C. In addition, the densification mechanism and variations of the microwave dielectric properties have also been discussed with the crystal phase and microstructure’s evolution.
Journal Article
Expression and purification of the antimicrobial peptide CM4 in Escherichia coli
The online version of the original article can be found under doi: 10.1007/s10529-008-9893-0
Journal Article
SUPPORTING LARGE-SCALE COLLABORATIVE VIRTUAL ENVIRONMENT IN GRID
The existing Collaborative Virtual Environment (CVE) systems have limited scalability due to the constraints in computer processing power and network bandwidth of participating hosts. In this paper, we propose a grid-based large-scale collaborative virtual environment architecture to scale across multiple geographically dispersed resources. The architecture consists of distributed mobile agents working cooperatively in supporting and managing the collaborative virtual environments. The mobile agents are autonomous and have the ability of migrating among hosts to maximize resource utilizations. Grid technologies allow the mobile agents to execute and communicate securely in multiple administrative domains. Grid-based scheduling components and polices can be integrated to provide intelligent resource optimizations. The result will be a more scalable architecture for supporting large-scale collaborative virtual environment.
Book Chapter
Tobacco dependence affects determinants related to quitting intention and behaviour
This study uses protection motivation theory (PMT) to examine the quitting intentions and behaviours of smokers who have varying levels of nicotine dependence. Our goals are to identify the psychological factors that influence smoking cessation and to provide valuable evidence to promote theory-guided interventions. This is a cross-sectional study that was conducted from July to August 2020. Participants were randomly selected on the streets of 26 provinces on mainland China. Data were collected via face-to-face interviews. Our analysis was conducted in three steps. First, we employed descriptive statistics to present the overall characteristics of our sample. Second, we analysed the association between PMT constructs and quitting intentions stratified by nicotine dependence. Third, we tested how quitting intentions were associated with quitting behaviours in each subgroup using logistic regression models. For intention, almost all the PMT constructs were significantly associated with quitting intention in the low-dependence group. For the moderate- and high-dependence groups, only perceived vulnerability (coefficient = 0.35, P = 0.04) was positively associated with quitting intention. For behaviour, we found a stronger association between quitting intention and behaviour in the low-dependence group (Coef. = 1.67, P = 0.00) than for the other groups. We found a significant association between e-cigarette use and quitting behaviour only in the low-dependence group (Coef. = 1.34, P = 0.00). Coefficients for the moderate- and high-dependence groups were not statistically significant. Smokers at various levels of nicotine dependence have different psychological factors that influence their intentions to stop smoking. Quitting intention was more significantly associated with quitting behaviour for the low nicotine-dependence group than for the other groups. More convincing research is necessary to determine how e-cigarette use affects quitting behaviour in the long term.
Journal Article
Recent Progress of the Application of Electropolymerization in Batteries and Supercapacitors: Specific Design of Functions in Electrodes
Electrochemical energy storage devices play a vital role in human life, and the requirements for their sustainability and environmental friendliness have been increasing in recent years. Electropolymerization, as a convenient method for polymer synthesis, has attracted increasing attentions in applications in the field of energy storage and conversion. It is not only commonly employed for the fabrication of various self‐supporting electrodes, but also is one of the most promising preparation strategies for organic electrode materials, internal interlayers within electrodes, functional protective layers, and current collector surface modifications. Previously published works have confirmed that the introduction of electropolymerization can effectively improve the electrochemical performance of various energy storage devices. However, there are still challenges in the universality of the synthesis route, in‐depth understanding of interface chemical behavior, and scaled‐up production. This mini review summarizes the main components in electropolymerization, material synthesis mechanisms, and their application principles in batteries and supercapacitors. Additionally, the current challenges and future development directions of electropolymerization have been discussed, offering some perspectives for further exploration. This mini review summarizes the main components in electropolymerization, material synthesis mechanisms, and their application principles in batteries and supercapacitors. Additionally, the current challenges and future development directions of electropolymerization have been discussed, offering some perspectives for further exploration.
Journal Article
Altitudinal Patterns of Leaf Traits and Leaf Allometry in Bamboo Pleioblastus amarus
Awareness of local-scale variation in leaf traits for a single species and the relationships between these traits and their dependence on altitude might be essential for extrapolating ecophysiological processes from the leaf to the ecosystem level. While altitudinal patterns of leaf traits have been extensively studied in a number of species, little is known about such patterns in bamboos. We analyzed leaf functional traits and leaf allometric relationships of
at three different altitudes (200, 400, and 800 m). With increasing altitude, most functional traits, including leaf length, width, perimeter, area, dry weight, and water content, decreased significantly, while the leaf length:width ratio exhibited a marked increase, resulting in a tendency toward narrow leaves. Specific leaf area first increased, and then decreased, while the change in leaf dry matter content showed the opposite trend. Leaf area was positively correlated with leaf length, leaf width and leaf perimeter, but negatively correlated with the leaf length:width ratio. With increasing altitude, the slopes of these relationships for leaf area first increased, and then decreased. Leaf biomass was positively correlated with leaf length, width, perimeter, and area, with the slopes of the relationships being the same at all altitudes. Thus, the leaves of this bamboo species at middle altitude have the highest specific leaf area and lowest leaf dry matter content. Our findings suggest that this bamboo species has a big potential of growth and morphological plasticity.
Journal Article