Photodiagnosis and Photodynamic Therapy
·
2024
·
IF 3.1
Jian-Feng Zhao,Chen Yang,Jie Zhou,Hai-Yan Zhang,Yu Geng
Purpose To assess the variability and correlation of ocular biometric parameters in eyes with cataracts and examine their association with age and gender. Methods A retrospective analysis was performed on biometric data from 7,458 eyes without retinal pathologies, using an optical biometer equipped with low-coherence reflectometry technology. Pearson's correlation coefficients (r) were used to evaluate the relationships between age, gender, and various ocular parameters, including axial length (AL), anterior chamber depth (ACD), lens thickness (LT), central corneal thickness (CCT), corneal refractive power (Km), and white-to-white (WTW) measurement. Results The mean AL was 23.82 ± 1.83 mm (SD). Among the study cohort, 8.0 % (593 eyes) were categorized as having short AL (AL ≤ 22 mm), 60.5 % (4,520 eyes) as having normal AL (22 mm < AL ≤ 24 mm), 21.2 % (1,579 eyes) as having long AL (24 mm < AL ≤ 26 mm), and 10.3 % (766 eyes) as having a AL (> 26 mm). The mean age of the cohort was 64.18 ± 14.95 years (range: 18 - 98 years), with males averaging 56.53 ± 13.88 years and females averaging 72.19 ± 11.41 years. Mean values for ACD, LT, Km, CCT, WTW, and angle kappa were found to vary with both age and gender. Males demonstrated significantly longer AL, deeper ACD, thicker LT, larger WTW, and lower Km compared to females ( P < 0.05). Although males exhibited a greater anterior segment length (ASL), this difference did not reach statistical significance ( P > 0.05). No significant correlation was found between ACD and AL in the short and long AL groups, while a positive correlation was observed in the normal and long AL groups. Additionally, LT demonstrated a negative correlation with AL in the normal AL group but a positive correlation in the long AL group. Conclusions Cataracts develop at a greater age in female patients than in males. Ocular biometric parameters, including ACD, LT, CCT, Km, and (WTW) measurement, are influenced by age and gender. Lens thickness is the primary factor affecting ACD, though CCT, Km, and WTW also play significant roles. Furthermore, a negative correlation between AL and LT was identified, with variations depending on AL classification.
研究领域:
眼科
·
生物医学工程
·
临床研究
·
老年医学
·
屈光手术
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2021
·Vol. 40
·期 11
·1691-1698
·
IF 3.712
Qingsong Hu,Zaifa Pan,Guijie Liang
White light-emitting diodes (WLEDs) fabricated by single-phase full color emitting phosphor are an emerging solution for health lighting. The crystallographic site occupation of activators in a proper host lattice is crucial for sophisticated design of such phosphor. Here, we report a high quality white light-emitting phosphor Ba 2 Ca(BO 3 ) 2 :Ce 3+ (K + ),Eu 2+ ,Mn 2+ with spectral distribution covering whole visible region. Blue light emission originates from Ce 3+ ions occupying preferentially Ba 2+ site by controlling synthesis conditions. Green and red lights are obtained from Eu 2+ occupying Ba 2+ (and Ca 2+ ) site and Mn 2+ occupying Ca 2+ site, respectively. In this triple-doped phosphor, strong red emission with a low concentration of Mn 2+ is realized by the efficient energy transfer from Ce 3+ and Eu 2+ to Mn 2+ . Furthermore, high quality white light is accomplished by properly tuning the relative doping amount of Ce 3+ (K + )/Eu 2+ /Mn 2+ based on efficient simultaneous energy transfer. The results indicate that Ba 2 Ca(BO 3 ) 2 :Ce 3+ (K + ),Eu 2+ ,Mn 2+ is a promising white light-emitting phosphor in WLEDs application.
研究领域:
材料科学
·
无机化学
·
发光材料
·
固态照明
·
能源材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 47
·期 5
·6548-6553
·
IF 3.83
Chuangchuang Ruan,Hongzhang Song,Mengmeng Fan,Haoshan Hao,Shaohui Liu
Misfit-layered oxides Ca 3 Co 4 O 9+δ + z wt% SiC ( z = 0.00, 0.025, 0.05, 0.1, 0.2) samples were synthesized using solid-state sintering method and the effects of SiC nanoparticles diapersion on the thermoelectric properties were investigated. Thermoelectric properties of Ca 3 Co 4 O 9+δ + z wt% SiC ( z = 0.00, 0.025, 0.05, 0.1, 0.2) were investigated up to 923 K. Compared with pure sample, the electrical resistivity of SiC-added samples reduces, for Ca 3 Co 4 O 9+δ + z wt% SiC ( z = 0.00, 0.025, 0.05, 0.1, 0.2) ceramic samples with x ≤ 0.05, the electrical resistivity decreases with increasing SiC nanoparticles adding amounts. And, the electrical resistivity exists transition from semiconductor to metal conduction mechanism. While, the thermal conductivity also decreases due to the addition of SiC nanoparticles . As a result, the Ca 3 Co 4 O 9+δ + 0.2 wt% SiC sample had the lowest thermal conductivity of 1.47 W/Km at 923 K, which was 18.4% lower than that of the Ca 3 Co 4 O 9+δ sample. The ZT value of Ca 3 Co 4 O 9+δ + 0.05 wt% SiC can reach 0.218, which is 40.9% higher than the pure Ca 3 Co 4 O 9+δ sample.
研究领域:
材料科学
·
凝聚态物理
·
无机非金属材料
·
能源材料
✓ 已验证
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2011
·Vol. 22
·期 12
·1497-1500
·
IF 0.775
Xiao Zheng Lan,Hai Rong Pei,Chuan Xian Cheng
Phase behavior of binary system of bromobenzene–chlorobenzene (C 6 H 5 Br–C 6 H 5 Cl) confined in SBA-15 and MCM-41 (pore diameter 8 nm, 3.8 nm, respectively) has been investigated by means of differential scanning calorimetry (DSC). Phase diagram of C 6 H 5 Br–C 6 H 5 Cl system confined in SBA-15 is a type of the complete miscible both in liquid and solid state, the same phase behavior as the bulk system. However, the phase diagram comprises only one boundary line, which is shifted down 22–36 K with respect to the bulk system. C 6 H 5 Br, C 6 H 5 Cl or the mixture within nanopores of MCM-41 is nonfreezing. The different phase behavior of the system confined in SBA-15 and MCM-41 is thought mainly due to the relative size of pore to molecule.
研究领域:
物理化学
·
材料科学
·
纳米科技
·
热力学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 10
·9983-9988
·
IF 2.195
Ma Panfei,Zhang Huimin,Chen Mingxing,Liu Ting,Chang Aimin,Su Zhi
Highly dense LaCrO 3 negative temperature coefficient (NTC) thermistor ceramics by low-heating solid-state method have been successfully synthesized in air ambient. The X-ray diffraction analysis has shown that both of the calcined powders and as-sintered ceramics crystallize in a perovskite structure. The relative densities of the ceramics synthesized by Cr(NO 3 ) 3 ·9H 2 O and the ceramics synthesized by CrCl 3 ·6H 2 O are 91% and 65%, respectively. The relationship between lnρ and 1000/T shows an approximate line in the measured temperature range. The values of ρ 25 and B 0/25 of the ceramics synthesized by Cr(NO 3 ) 3 ·9H 2 O and the ceramics synthesized by CrCl 3 ·6H 2 O are 424.8 Ω cm, 3252 K and 1835.9 Ω cm, 3636 K, respectively.
研究领域:
材料科学
·
无机非金属材料
·
电子陶瓷
·
热敏材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Lu Qi,Xianghai Meng,Rui Zhang,Haiyan Liu,Chunming Xu,Zhichang Liu,Peter A.A. Klusener
Droplet size distribution (DSD) and mean droplet size of chloroaluminate ionic liquid (IL)–heptane dispersion in a stirred vessel were investigated as a model system for the composite ionic liquid/hydrocarbon system applied in the commercial isobutane alkylation process. Focused beam reflectance measurement was used to identify the phase inversion, and particle video microscope (PVM) was employed to measure the DSD of IL-continuous dispersions. The effects of agitation speed and dispersed phase holdup on the DSD and mean droplet size were investigated. Phase inversion was found at a heptane hold-up of just above 0.5. The observed DSDs could be described well by logarithmic normal distributions in spite of variable operating conditions. The DSDs appeared to be more or less independent of the dispersed phase holdup ( ϕ heptane ⩾ 0.3) at the same agitation speed. A semi-empirical correlation based on Shinnar theory was proposed to predict the droplet mean size in the impeller region for the IL-continuous dispersion, and the predicted value agreed well with the experimental data. This work will be a good basis to predict the dispersion behavior under process conditions.
研究领域:
化学工程
·
流体力学
·
多相系统
·
过程工程
·
胶体与界面科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Sujuan Wang,Qing Luo,Xiaohua Luo,Shengcan Ma,Changcai Chen,Fei Gao,Bodong Lv,Rui Zhong,Weijun Ren,Zhenchen Zhong
The effects of Si and Cu doping on crystal structures, magnetism , and the magnetocaloric effect of EuAl 4 have been investigated. EuAl 4 , EuAl 3.35 Si 0.65 , and EuAl 3.82 Cu 0.18 single crystals grown by the Al flux method are isotypic and crystallize in BaAl 4 -type structure with space group I 4 /mmm . Compared to the pristine compound EuAl 4 , the lattice parameter a keeps almost unchanged and c decreases obviously by Si doping, while a decreases and c increases upon Cu-substitution. These irregular changes in the lattice parameters may contribute to the electronegativity difference between Si and Cu. Cu and Si doping enhances the ferromagnetic interaction, and the direction of easy magnetization changes from the ab plane to the c axis upon the Cu-substitution. Multiple-step metamagnetic transitions are still observed in EuAl 3.35 Si 0.65 as applying the magnetic field along the c axis, while EuAl 3.82 Cu 0.18 shows ferromagnetic behavior along the ab plane and c axis. As a consequence, the low-field magnetocaloric effect is significantly enhanced. The maximum magnetic entropy change under a field change of 20 kOe increases from − 8.4 J/kg K for EuAl 4 to − 12.9 J/kg K for EuAl 3.35 Si 0.65 and − 15.9 J/kg K for EuAl 3.82 Cu 0.18 . The corresponding values of refrigerating capacity are 67, 140, and 147 J/kg, respectively. The remarkable magnetocaloric performances suggest that the Cu-doped EuAl 4 compound is an excellent candidate material for low-temperature magnetic refrigeration.
研究领域:
凝聚态物理
·
材料科学
·
磁学
·
低温物理
·
功能材料
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 3
·1551-1561
·
IF 3.069
Long Meng,Yunan Wu,Kai Pan,Ye Zhu,Xiaojie Li,Wei Wei,Xiaoya Liu
Nickel-titanium alloy (NiTi alloy) has recently received an increasing amount of attention. However, the release of toxic nickel ions and the threat of implant infections has limited its clinical applications. Thus, we report a promising copolymer coating with excellent nickel ion (Ni2+) inhibition release, cytocompatibility, and antimicrobial properties to solve these safety issues involving NiTi alloy implantation. Quaternized copolymers poly (7-hydroxy-4-methylcoumarin methacrylate-co-2-hydroxyethyl methacrylate-co-2-(dimethylamino)ethyl methacrylate) (PCHD-Q) with many hydroxyl and tertiary amine groups were first synthesized, self-assembled into nanoparticles, and then deposited on NiTi substrate through electrodeposition. After UV irradiation, scanning electron microscopy (SEM) images revealed that homogeneous, continuous, and dense coatings were obtained. The coatings showed good improvement of protective behavior for the NiTi alloy in an in vitro environment and could significantly decrease the release of Ni2+ through physical barriers and physical adsorption, which could obviously reduce cytotoxicity inducing by Ni2+. According to in vitro cell viability and antibacterial tests, the quaternized coating materials not only provided a relatively stable biointerface for cell adhesion, spreading and growth, but also obtained excellent antimicrobial activity for the bare NiTi alloy against S. aureus and E. coli. These results suggested that our coatings materials have the potential for improving the safety and success rate of NiTi-based implantations.
研究领域:
材料科学
·
生物医学工程
·
表面涂层技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 21
·30039-30042
·
IF 4.527
Leihao Feng,Qiwei Hu,Li Lei,Lei Qi,Leilei Zhang,Meifang Pu,Zili kou,Fang Peng,Duanwei He,Yohei Kojima,Hiroaki Ohfuji,Tetsuo Irifune
High-hardness TaN compacts with a diameter and height of 6 mm were synthesized through the phase transformation of CoSn-type into WC-type TaN under experimental conditions of high temperature and high pressure . The Vickers hardness of WC-type TaN compacts obtained at the pressure of 5 GPa and the temperature of 1873 K is found to be ~21.5 ± 1.5 GPa with a load of 3 Kg, which is comparable to that of the pure tungsten carbide compact (~20 GPa) and higher than those of ultrahigh temperature ceramics ZrB 2 and HfB 2 under the same load. The high hardness of WC-type TaN compacts presented in this work is attributed to the deviatoric strain and well-bonded nanograins . The synthesized WC-type TaN compacts also possess a high oxidation temperature (1072 K). These results suggest that the WC-type TaN with high hardness and high thermal stability holds great promise for industrial applications.
研究领域:
材料科学
·
无机非金属材料
·
超硬材料
·
高温材料
·
固态化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 19
·26869-26876
·
IF 4.527
Shao-Min Lin,Ya-Ling Yu,Ming-Feng Zhong,Huan Yang,Chen-Yang Zhang,Zhi-Jie Zhang,Wei Xu,Jiong-Yan Xie,Yu-Chun Qiu
Converting the γ phase into the α phase completely is necessary in the presintering stage of industrial alumina (Al 2 O 3 ), which requires high temperature and energy consumption. To reduce the presintering temperature, γ-Al 2 O 3 was activated by oxalic acid . XRD , 27 Al-MAS-NMR and TG-DSC were used to characterize the γ - alumina before and after activation, and the phase transformation was studied. The formation temperature of α-Al 2 O 3 decreased to 1029 °C for oxalic acid activated γ-Al 2 O 3 , and the α-fraction was 100% for activated γ-Al 2 O 3 at 1300 °C. After oxalic acid activation , the diffraction peak intensity of γ-Al 2 O 3 decreased significantly; the results of 27 Al-MAS-NMR suggested that octahedral [AlO 6 ] in γ-Al 2 O 3 was easier than tetrahedral [AlO 4 ] to be attacked by oxalic acid , and the formation of pentavalent [AlO 5 ] with higher reaction activity, which was in favour of the lowering formation temperature of α-Al 2 O 3 . The dissolution concentration of Al increased after oxalic acid activation, and the dissolution process was controlled by surface reactions. Oxalic acid mainly attacked the octahedral aluminium in γ-Al 2 O 3 and extracted Al as three complexes of [Al(C 2 O 4 )] + , [Al(C 2 O 4 ) 2 ] - and [Al(C 2 O 4 ) 3 ] 3- . Oxalic acid activated γ - Al 2 O 3 with a lower phase transformation temperature has broad application prospects in the alumina industry.
研究领域:
材料化学
·
无机化学
·
固态化学
·
工业催化
·
陶瓷材料
✓ 已验证
DOI
高影响因子
Results in Physics
·
2022
·
IF 4.565
Yige Du,Qilong Gao,Andrea Sanson,Hengli Xie,Yangming Hu,Gaojie Zeng,Juan Guo,Xiao Ren,Erjun Liang
Negative thermal expansion (NTE) is an intriguing physical phenomenon, which is of great significance for the high precision application. In this work, we have realized to broaden the NTE temperature zone in Mg 2 P 2 O 7 -based bulk material by doping Cu atom on the Mg site. A joint study of Raman scattering and X-ray diffraction (XRD) indicates that there are double phases in the NTE temperature zone, and the NTE of Mg 1.9 Cu 0.1 P 2 O 7 bulk material comes from the phase transition of α - and β -phase. The present work provides a way to optimize negative thermal expansion property in phase transition typed materials.
研究领域:
材料科学
·
凝聚态物理
·
无机化学
·
功能材料
·
热学性能
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 47
·期 5
·6842-6847
·
IF 3.83
Shunjin Xiong,Rongxia Huang,Congfei Peng,Yejing Dai,Jiajiu Li,Wen Bai,Hua-Tay Lin
A series of HfO 2 -modified (Bi 0 .475 Na 0 . 405 K 0 . 055 Li 0.015 ) 0.95 Ba 0 . 05 Ti (1- x ) Hf x O 3 ( x = 0–0.015) lead-free ceramics were prepared. Results of detailed characterizations showed that the addition of HfO 2 had little influence on the grain size, and all of the samples showed the pure perovskite structure. As the Hf 4+ content increases, the samples changed from the normal ferroelectric phase to the ergodic relaxor state at room temperature, and the ceramics with x = 0.01 showed a high electro-strain of 0.295% at 6 kV/mm. Therefore, this study provides a new insight into of how the HfO 2 addition influences the ferroelectric property of the BNT-based ceramics by B-site substitution.
研究领域:
材料科学
·
无机非金属材料
·
功能陶瓷
·
铁电材料
·
压电材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）