115 results on '"Wencai Zhang"'
Search Results
2. A Randomized Controlled Trial to Evaluate the Effect of Metaphors on Anxiety Symptoms Among Chinese Graduate Students: The Mediation Effect of Worry
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Jinghan Hu, Xiaoyu Zhang, Ruonan Li, Jianxin Zhang, and Wencai Zhang
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Life-span and Life-course Studies - Published
- 2022
3. Therapeutic metaphors: Theories, empirical efficacy and underlying mechanisms
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Guanlin YU, Ruixuan LIU, and Wencai ZHANG
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General Economics, Econometrics and Finance - Published
- 2022
4. Comparative analysis of the organelle genomes of three Rhodiola species provide insights into their structural dynamics and sequence divergences
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Xiaolei Yu, Pei Wei, Zhuyifu Chen, Xinzhong Li, Wencai Zhang, Yujiao Yang, Chenlai Liu, Shuqi Zhao, Xiaoyan Li, and Xing Liu
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Plant Science - Abstract
Background Plant organelle genomes are a valuable resource for evolutionary biology research, yet their genome architectures, evolutionary patterns and environmental adaptations are poorly understood in many lineages. Rhodiola species is a type of flora mainly distributed in highland habitats, with high medicinal value. Here, we assembled the organelle genomes of three Rhodiola species (R. wallichiana, R. crenulata and R. sacra) collected from the Qinghai-Tibet plateau (QTP), and compared their genome structure, gene content, structural rearrangements, sequence transfer and sequence evolution rates. Results The results demonstrated the contrasting evolutionary pattern between plastomes and mitogenomes in three Rhodiola species, with the former possessing more conserved genome structure but faster evolutionary rates of sequence, while the latter exhibiting structural diversity but slower rates of sequence evolution. Some lineage-specific features were observed in Rhodiola mitogenomes, including chromosome fission, gene loss and structural rearrangement. Repeat element analysis shows that the repeats occurring between the two chromosomes may mediate the formation of multichromosomal structure in the mitogenomes of Rhodiola, and this multichromosomal structure may have recently formed. The identification of homologous sequences between plastomes and mitogenomes reveals several unidirectional protein-coding gene transfer events from chloroplasts to mitochondria. Moreover, we found that their organelle genomes contained multiple fragments of nuclear transposable elements (TEs) and exhibited different preferences for TEs insertion type. Genome-wide scans of positive selection identified one gene matR from the mitogenome. Since the matR is crucial for plant growth and development, as well as for respiration and stress responses, our findings suggest that matR may participate in the adaptive response of Rhodiola species to environmental stress of QTP. Conclusion The study analyzed the organelle genomes of three Rhodiola species and demonstrated the contrasting evolutionary pattern between plastomes and mitogenomes. Signals of positive selection were detected in the matR gene of Rhodiola mitogenomes, suggesting the potential role of this gene in Rhodiola adaptation to QTP. Together, the study is expected to enrich the genomic resources and provide valuable insights into the structural dynamics and sequence divergences of Rhodiola species.
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- 2023
5. Long-term outcomes of less drug-eluting stents by the use of drug-coated balloons in de novo coronary chronic total occlusion intervention: A multicenter observational study
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Xi Wang, Xinyue Yang, Wenjie Lu, Liang Pan, Zhanying Han, Sancong Pan, Yingguang Shan, Xule Wang, Xiaolin Zheng, Ran Li, Yongjian Zhu, Peng Qin, Qiangwei Shi, Shuai Zhou, Wencai Zhang, Sen Guo, Peisheng Zhang, Xiaofei Qin, Guoju Sun, Zhongsheng Qin, Zhenwen Huang, and Chunguang Qiu
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Cardiology and Cardiovascular Medicine - Abstract
BackgroundData on drug-coated balloons (DCB) for de novo coronary chronic total occlusion (CTO) are limited. We aimed to investigate the long-term outcomes of substitution of drug-eluting stents (DES) by DCB.MethodsWe compared the outcomes of less DES strategy (DCB alone or combined with DES) and DES-only strategy in treating de novo coronary CTO in this prospective, observational, multicenter study. The primary endpoints were major adverse cardiovascular events (MACE), target vessel revascularization, myocardial infarction, and death during 3-year follow-up. The secondary endpoints were late lumen loss (LLL) and restenosis until 1-year after operation.ResultsOf the 591 eligible patients consecutively enrolled between January 2015 and December 2019, 281 (290 lesions) were treated with DCB (DCB-only or combined with DES) and 310 (319 lesions) with DES only. In the DCB group, 147 (50.7%) lesions were treated using DCB-only, and the bailout stenting rate was relatively low (3.1%). The average stent length per lesion in the DCB group was significantly shorter compared with the DES-only group (21.5 ± 25.5 mm vs. 54.5 ± 26.0 mm, p p p p > 0.999). The Kaplan–Meier estimates of MACE at 3-year (11.8% vs. 12.0%, log-rank p = 0.688) was similar between the groups.ConclusionPercutaneous coronary intervention with DCB is a potential “stent-less” therapy for de novo CTO lesions with satisfactory long-term clinical results compared to the DES-only approach.
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- 2023
6. Enhanced Strength-Ductility Synergy and Mechanisms of Heterostructured Ti6al4v-Cu Alloys Produced by Laser Powder Bed Fusion
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Kunmao Li, Junjie Yang, yanliang yi, Xiaochun Liu, Yujing Liu, Lai-Chang Zhang, Wencai Zhang, W. Li, Dongchu Chen, and Shengfeng Zhou
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- 2023
7. Research on Airfield Navigation Lamps Pollution Imaging and Its Detection Algorithm
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Wencai Zhang, Qingji Gao, and Xin Tian
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- 2023
8. Effects of contaminant metal ions on precipitation recovery of rare earth elements using oxalic acid
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Bin Ji, Aaron Noble, Wencai Zhang, and Qi Li
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Precipitation (chemistry) ,Metal ions in aqueous solution ,Rare earth ,Oxalic acid ,Inorganic chemistry ,chemistry.chemical_element ,0914 Resources Engineering and Extractive Metallurgy ,02 engineering and technology ,General Chemistry ,Hematite ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Oxalate ,0104 chemical sciences ,chemistry.chemical_compound ,Cerium ,chemistry ,Geochemistry and Petrology ,visual_art ,Mole ,visual_art.visual_art_medium ,0210 nano-technology ,Materials - Abstract
Solution equilibrium calculations were performed in this study to understand the impact of contaminant metal ions on the precipitation efficiency of selected rare earth elements (Ce3+, Nd3+, and Y3+) using oxalic acid as a precipitant. Trivalent metal ions, Al3+ and Fe3+, were found to considerably affect the precipitation efficiency of REEs. When Al3+ and Fe3+ concentrations were increased by 1 × 10−4 mol/L, in order to achieve an acceptable cerium recovery of 93% from solutions containing 1 × 10−4 mol/L Ce3+, oxalate dosage needed to increase by 1.2 × 10−4 and 1.68 × 10−4 mol/L, respectively. Such great impacts on the required oxalate dosage were also observed for Nd3+ and Y3+, which indicates that oxalic acid consumption and cost will be largely increased when the trivalent metal ions exist in REE-concentrated solutions. Effects of the divalent metal ions on the oxalate dosage is minimal. Furthermore, solution equilibrium calculation results showed that the precipitation of Fe3+ and Ca2+ (e.g., hematite and Ca(C2O4)∙H2O(s)) likely occurs during the oxalate precipitation of REEs at relatively high pH (e.g., pH 2.5), which will reduce rare earth oxalate product purity. In addition to the metal ions, anionic species, especially SO42−, were also found to negatively affect the precipitation recovery of REEs. For example, when 0.1 mol/L SO42− occurs in a solution containing 1 × 10−4 mol/L Ce3+ and 4 × 10−4 mol/L oxalate, the pH needed to be elevated from 2.0 to 3.3 to achieve the acceptable recovery. Overall, findings from this study provide guidance for the obtainment of high-purity rare earth products from solutions containing a considerable amount of contaminant metal ions by means of oxalic acid precipitation. Accepted version
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- 2022
9. Effect of Soil Salt Content on Stray Current Corrosion of Buried Metal
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Yaning Li, Meng Jiao, Ye Wang, Wenfei Li, Hong Kang, and Wencai Zhang
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General Computer Science ,General Engineering ,General Materials Science ,Electrical and Electronic Engineering - Published
- 2022
10. Zn leaching recovery and mechanisms from end-of-life tire rubber
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Shiyu Li, Thien Q. Tran, Qi Li, Bin Ji, Alexander S. Brand, and Wencai Zhang
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Economics and Econometrics ,Waste Management and Disposal - Published
- 2023
11. Drug-Coated Balloon-Only Angioplasty Outcomes in Diabetic and Nondiabetic Patients with De Novo Small Coronary Vessels Disease
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Yingguang Shan, Botey Katamu Benjamin, Guoju Sun, Peng Qin, Zhanying Han, Xule Wang, Sen Guo, Xi Wang, Liang Pan, Shuai Zhou, Xiaolin Zheng, Ran Li, Qiangwei Shi, Xiaofei Qin, Chunguang Qiu, Wenjie Lu, Chhatra Pratap Singh, Wencai Zhang, and Jianzeng Dong
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medicine.medical_specialty ,Drug coated balloon ,Article Subject ,business.industry ,medicine.medical_treatment ,Coronary Artery Disease ,Disease ,Coronary Angiography ,Coronary Vessels ,behavioral disciplines and activities ,Treatment Outcome ,Pharmaceutical Preparations ,RC666-701 ,Internal medicine ,Angioplasty ,Diabetes Mellitus ,medicine ,Cardiology ,Diseases of the circulatory (Cardiovascular) system ,Humans ,Radiology, Nuclear Medicine and imaging ,Angioplasty, Balloon, Coronary ,Cardiology and Cardiovascular Medicine ,business ,Research Article - Abstract
Background. The revascularization of small vessels using drug-eluting stents remains challenging. The use of the drug-coated balloon is an attractive therapeutic strategy in de novo lesions in small coronary vessels, particularly in the diabetic group. This study aimed to assess the outcomes of DCB-only angioplasty in small vessel disease. Methods. A total of 1198 patients with small vessel disease treated with DCB-only strategy were followed. Patients were divided into the diabetic and nondiabetic groups. Clinical and angiographical follow-up were organized at 12 months. The primary endpoints were target lesion failure and secondary major adverse cardiac events. Results. There was a significantly higher rate of target lesion failure among diabetic patients compared to nondiabetic [17 (3.9%) vs. 11 (1.4%), P = 0.006 ], taken separately, the rate of target lesion revascularization significantly differed between groups with a higher rate observed in the diabetic group [9 (2%) vs. 4 (0.5%), P = 0.014 ]. Diabetes mellitus remained an independent predictor for TLF (HR: 2.712, CI: 1.254–5.864, P = 0.011 ) and target lesion revascularization (HR: 3.698, CI: 1.112–12.298, P = 0.033 ) after adjustment. However, no significant differences were observed between groups regarding the target vessel myocardial infarction (0.6% vs. 0.1%, P = 0.110 ) and MACE [19 (4.4%) vs. 21 (2.7%), P = 0.120 ]. Conclusion. Drug-coated balloon-only treatment achieved lower incidence rates of TLF and MACE. Diabetes is an independent predictor for target lesion failure and target lesion revascularization at one year following DCB treatment in small coronary vessels. We observed no significant differences between groups regarding MACE in one year.
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- 2021
12. The effect of mechanical grinding and thermal treatment on the recovery of rare earth elements (REEs) from kaolinite
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Bin Ji and Wencai Zhang
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chemistry.chemical_classification ,Chemistry ,General Chemical Engineering ,Thermal decomposition ,Analytical chemistry ,Kaolinite ,Salt (chemistry) ,Thermal treatment ,Crystal structure ,Leaching (metallurgy) ,Raw material ,Grinding - Abstract
REE recovery from a kaolinite sample was conducted in the present study. The results of mineralogical analyses, salt leaching, and acid leaching tests confirmed that REEs predominantly existed as florencite (REEAl3(PO4)2(OH)6) in the material, and the proportion of ion-exchangeable and ion-substituted REEs was negligible. Mechanical grinding for 4 h completely destroyed the crystal structure of the material, but the recovery of total REEs was less than 20%, indicating that insufficient liberation of the REE-bearing particles is not the only factor leading to the low recovery. Thermal treatment of the raw material at 600 °C for 2 h largely enhanced the total REE recovery to as high as 92%. The improved recovery was ascribed to the thermal decomposition of crystallized florencite into an amorphous phase, which was proved through transmission electron microscopy - energy dispersive X-ray analysis. Findings from the study will contribute to REE recovery and comprehensive utilization of kaolinite.
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- 2021
13. qGL3/OsPPKL1 induces phosphorylation of 14-3-3 protein OsGF14b to inhibit OsBZR1 function in brassinosteroid signaling
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Ruqin Wang, Jiaqi Zhang, Hongsheng Zhang, Jianbo Li, Wencai Zhang, Ji Huang, Yuji Wang, Xiuying Gao, Jing Yin, Huaying Du, and Guang Cai
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Oryza sativa ,Genotype ,Physiology ,Phosphatase ,Genetic Variation ,food and beverages ,Oryza ,Plant Science ,Quantitative trait locus ,Cell biology ,Serine ,chemistry.chemical_compound ,14-3-3 Proteins ,chemistry ,Gene Expression Regulation, Plant ,Brassinosteroids ,Genetics ,Brassinosteroid ,Phosphorylation ,Edible Grain ,Research Articles ,14-3-3 protein ,Function (biology) ,Signal Transduction - Abstract
Brassinosteroids (BRs) play essential roles in regulating plant growth and development, however, gaps still remain in our understanding of the BR signaling network. We previously cloned a grain length quantitative trait locus qGL3, encoding a rice (Oryza sativa L.) protein phosphatase with Kelch-like repeat domain (OsPPKL1), that negatively regulates grain length and BR signaling. To further explore the BR signaling network, we performed phosphoproteomic analysis to screen qGL3-regulated downstream components. We selected a 14-3-3 protein OsGF14b from the phosphoproteomic data for further analysis. qGL3 promoted the phosphorylation of OsGF14b and induced the interaction intensity between OsGF14b and OsBZR1. In addition, phosphorylation of OsGF14b played an important role in regulating nucleocytoplasmic shuttling of OsBZR1. The serine acids (Ser258Ser259) residues of OsGF14b play an essential role in BR-mediated responses and plant development. Genetic and molecular analyses indicated that OsGF14b functions as a negative regulator in BR signaling and represses the transcriptional activation activity of OsBZR1. Collectively, these results demonstrate that qGL3 induces the phosphorylation of OsGF14b, which modulates nucleocytoplasmic shuttling and transcriptional activation activity of OsBZR1, to eventually negatively regulate BR signaling and grain length in rice.
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- 2021
14. Rare earth elements (REEs) recovery and porous silica preparation from kaolinite
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Bin Ji and Wencai Zhang
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Mineral ,Chemistry ,General Chemical Engineering ,02 engineering and technology ,Thermal treatment ,Raw material ,021001 nanoscience & nanotechnology ,020401 chemical engineering ,Specific surface area ,Kaolinite ,Response surface methodology ,Selective leaching ,0204 chemical engineering ,0210 nano-technology ,Porosity ,Nuclear chemistry - Abstract
A kaolinite containing 245 ppm of REEs was used as a feedstock for REE recovery. Acid leaching test results showed that less than 20% of the REEs were leached using 1.2 mol/L HCl. However, after thermal treatment at 600 °C, a recovery of over 80% was obtained with a much lower acid concentration (0.01 mol/L). Meanwhile, only 3.91% Al, 2.34% Fe, 8.63% K, 9.32% Mg, 0.08% Ti, and 5.34% Ca were simultaneously extracted. Therefore, high-purity rare earth products are likely produced from the kaolinite. To achieve a more comprehensive utilization of the kaolinite, the residual solid after REE recovery was subjected to a selective leaching process to prepare porous silica. Comparisons among three different types of mineral acids showed that H2SO4 provided the best performance. The effects of different factors were investigated using the response surface methodology. A porous silica with as high as 336.95 m2/g specific surface area was ultimately produced.
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- 2021
15. Clinical outcomes of drug-coated balloon in coronary lesions: a real-world, all-comers study
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Wencai Zhang, Peisheng Zhang, Zhenwen Huang, Chunguang Qiu, Guoju Sun, Qiangwei Shi, Sen Guo, Shuai Zhou, Xi Wang, Yingguang Shan, Sancong Pan, Xiaolin Zheng, Yanjun Zhou, Xiaofei Qin, Zhanying Han, Xule Wang, Zhongsheng Qin, Wenjie Lu, Peng Qin, Liang Pan, and Ran Li
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medicine.medical_specialty ,medicine.medical_treatment ,Coronary Artery Disease ,Revascularization ,Coronary Restenosis ,Coronary artery disease ,Percutaneous Coronary Intervention ,Coated Materials, Biocompatible ,Restenosis ,Angioplasty ,Internal medicine ,medicine ,Humans ,Prospective Studies ,Myocardial infarction ,Angioplasty, Balloon, Coronary ,Prospective cohort study ,business.industry ,Percutaneous coronary intervention ,General Medicine ,medicine.disease ,Death ,Treatment Outcome ,Cardiology ,Cardiology and Cardiovascular Medicine ,business ,Mace - Abstract
Although drug-eluting stents are the most common interventional devices for patients with coronary disease, drug-coated balloons (DCBs) represent a novel therapeutic alternative in certain scenarios. This prospective, observational all-comers study explored the clinical outcomes of DCB use in patients with coronary lesions. All patients treated with DCBs were enrolled in this study, including patients with in-stent restenosis (ISR) or de novo lesions. The primary outcome was the target lesion revascularization (TLR) rate at one year. We enrolled 2306 patients with 2660 lesions and performed DCB angioplasty in 399 patients (17.3%) with ISR and 1907 patients (82.7%) with de novo lesions. During follow-up (366 ± 46 days), the TLR rate was lower in the de novo lesion group (1.31%) compared to the ISR group (7.02%) [odds ratio (OR) 0.176, 95% confidence interval (CI) 0.101–0.305, p
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- 2021
16. Creative Factors and Psychotherapeutic Insight: Effects of Novelty and Appropriateness
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Ruixuan Liu, Wencai Zhang, Fei Yu, Jing Luo, and Jianxin Zhang
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Visual Arts and Performing Arts ,media_common.quotation_subject ,Metaphor comprehension ,Novelty ,Context (language use) ,Affect (psychology) ,Creativity ,Alliance ,Originality ,Developmental and Educational Psychology ,Psychology (miscellaneous) ,Psychology ,media_common ,Cognitive psychology - Abstract
Novelty and appropriateness have long been considered as the two fundamental elements of creativity; however, whether these two can separately affect creativity or its related processes remains unc...
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- 2021
17. Comparative Analysis of Chloroplast Genomes within
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Zhuyifu, Chen, Xiaolei, Yu, Yujiao, Yang, Pei, Wei, Wencai, Zhang, Xinzhong, Li, Chenlai, Liu, Shuqi, Zhao, Xiaoyan, Li, and Xing, Liu
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Evolution, Molecular ,Saxifragaceae ,Carbon Dioxide ,Genome, Chloroplast ,Phylogeny ,Microsatellite Repeats - Published
- 2022
18. Optimal Control Method of Motor Torque Loading via Active Disturbance Rejection Control
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Gan Zhan, Wencai Zhang, Tianzhen Li, Zhanhua Xin, Dong Wang, Xinyi Dong, and Shaohua Niu
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- 2022
19. Inverse Kinematics Analysis and Mechatronics Design of Mobile Parallel Manipulator for Assisted Assembly
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Yuan Huang, Duanling Li, Kaijie Dong, Wencai Zhang, and Xianming Gao
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- 2022
20. Novel biomimetic mesoporous silica nanoparticle system possessing targetability and immune synergy facilitates effective solid tumor immuno-chemotherapy
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Haoran Zhu, Yang Liu, Xinfeng Yi, Chuyun Zhu, Yuanyue Fu, Zerong Huang, Kairui Zhu, Wencai Zhang, Huige Hou, Chenghong Sun, Cheng Zhong, Wei Liu, Zhizhong Li, Baocheng Wang, and Jin Wo
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Biomaterials ,Biomimetics ,Neoplasms ,Biomedical Engineering ,Humans ,Nanoparticles ,Bioengineering ,Immunotherapy ,Silicon Dioxide ,Porosity - Abstract
New strategies that enhance both the targetability of chemotherapy drugs and the synergistic effects of chemotherapy and immunotherapy are urgently needed for efficacious solid tumor therapy. In this study, a novel biomimetic nanoparticle system possessing the properties of tumor targeting and immune synergy was designed to meet these requirements. Mesoporous silica nanoparticles loaded with the chemotherapeutic drug doxorubicin (DOX) were coated with cell membranes modified by glycosylphosphatidylinositol (GPI)-anchored anti-HER2 single chain variable fragment (scFv) and the GPI-anchored co-stimulatory molecule CD80 (to promote solid tumor-targeted chemotherapy and cooperated immunotherapy, respectively). The impact of the nanotherapeutic system on both tumor-targeted chemotherapy and cellular immune response was investigated through in vitro and in vivo experiments. The results show that the novel biomimetic therapeutic system effectively promoted antitumor efficiency in vitro and in vivo. In addition, this therapeutic system further enhanced antitumor capacity by increasing CD8
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- 2022
21. Expert consensus on the bone repair strategy for osteoporotic fractures in China
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Hao Zhang, Yan Hu, Xiao Chen, Sicheng Wang, Liehu Cao, Shiwu Dong, Zhongmin Shi, Yanxi Chen, Liming Xiong, Yunfei Zhang, Dianying Zhang, Baoqing Yu, Wenming Chen, Qining Wang, Peijian Tong, Ximing Liu, Jianzheng Zhang, Qiang Zhou, Feng Niu, Weiguo Yang, Wencai Zhang, Yong Wang, Shijie Chen, Jinpeng Jia, Qiang Yang, Peng Zhang, Yong Zhang, Jun Miao, Kuo Sun, Tao Shen, Bin Yu, Lei Yang, Lei Zhang, Dongliang Wang, Guohui Liu, Yingze Zhang, and Jiacan Su
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Radius ,China ,Consensus ,Endocrinology, Diabetes and Metabolism ,Humans ,Osteoporosis ,Osteoporotic Fractures ,Aged - Abstract
Osteoporotic fractures, also known as fragility fractures, are prevalent in the elderly and bring tremendous social burdens. Poor bone quality, weak repair capacity, instability, and high failure rate of internal fixation are main characteristics of osteoporotic fractures. Osteoporotic bone defects are common and need to be repaired by appropriate materials. Proximal humerus, distal radius, tibia plateau, calcaneus, and spine are common osteoporotic fractures with bone defect. Here, the consensus from the Osteoporosis Group of Chinese Orthopaedic Association concentrates on the epidemiology, characters, and management strategies of common osteoporotic fractures with bone defect to standardize clinical practice in bone repair of osteoporotic fractures.
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- 2022
22. Design and Research of Form Controlled Planar Scaling Mechanism based on 4D Printing Technology
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Wencai Zhang, Zhenghao Ge, and Duanling Li
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Structural members and kinematic pairs made of rigid materials can be flexibly used in practical applications and obtain shape-changing mechanisms. However, it also leads to a relatively complex mechanical structure and overmuch kinematic pairs, which increases the difficulty of controlling the mechanism and thus limits its application. The emergence of 4D printing technology and smart materials provides new ideas for simplifying shape-changing mechanism structure and innovation. Although smart materials are already being used in many types of mechanisms, they are almost always unique cases. How to organically combine with a specific mechanism, innovate the type of mechanism, and systematically research from structural design to deformation control is still a blank area. Therefore, this paper designs a type of novel mechanism consisting of an angulated scissor unit and a form-controlled unit, the form-controlled planar scaling mechanism, which can achieve drivable self-adjustment of size ratio under predetermined thermal stimulation. The shape-changing mechanism is thus extended to a form-controlled mechanism. This mechanism's construction method and structural principles are analyzed, and the critical structural design parameters required for deformation control are derived. Based on the above research, the core form-controlled unit that controls the deformation of this type of mechanism is designed structurally and extended to deformation control research. Finally, two sets of prototype machines are manufactured and verified the feasibility of the construction method and deformation control scheme and the correctness of the theoretical analysis. This type of mechanism promotes the innovation of mechanism design methods. It shows many application prospects in satellite deployment structures and space probe walking systems.
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- 2022
23. Effect of Polypropylene Grafted Maleic Anhydride (PP-G-MAH) on the Properties of Asphalt and its Mixture Modified With Recycled Polyethylene/Recycled Polypropylene (RPE/RPP) Blends
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Wencai Zhang, Xiaogang Hao, Changxin Fan, Shuai Zhang, Dechong Ma, Xiaofang Yu, Zhaohua Fu, and Gongji Feng
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Materials Science (miscellaneous) - Abstract
In this study, a ternary blend modifier (TBM) was prepared with RPE, RPP, and various dosages of PP-g-MAH (i.e., 0%, 1%, 3%, 5%, 7%, and 9% by weight of RPE and RPP) by a twin-screw extruder. The performance of TBM (4% by weight of asphalt) modified asphalt was studied, with the increase of PP-g-MAH content, the penetration decreases gradually, but softening point and viscosity increases and ductility exists minimum value at 7% content, with the increasing of PP-g-MAH percentage, the dynamic rheological properties show that |G*| increases, while the δ and |G*|cosδ decrease, and the fatigue performance (|G*|sinδ) of TBM modified asphalt is worse than virgin asphalt. Dynamic stability test shows that TBM shows the prominent high-temperature properties of a modified (asphalt mixture. BBR test indicates that the m-value of asphalt modified with TBM does not fulfill the requirements (m-value>0.3) except at 5% and 7%, but the S meets the standard requirements (S < 300 MPa), and increases from 0% to 7%, then decreases slightly. In order to illuminate possible reasons, a chemical reaction (ester compounds generated) and physical twines of concerned polymer molecules were put forward, and the results were confirmed by infrared analysis.
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- 2022
24. Lactic acid production from food waste hydrolysate by Lactobacillus pentosus: Focus on nitrogen supplementation, initial sugar concentration, pH, and fed-batch fermentation
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Katherine Lobeda, Qing Jin, Jian Wu, Wencai Zhang, and Haibo Huang
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Nitrogen ,Peptones ,Dietary Supplements ,Fermentation ,Lactic Acid ,Hydrogen-Ion Concentration ,Lactobacillus pentosus ,Sugars ,Food Science ,Refuse Disposal - Abstract
Lactic acid production from food waste via fermentation is environmentally sustainable. However, the characteristics of food waste fermentation to produce lactic acid are not well understood due to the complexity of food waste. This study aims to understand the effects of key variables on the characteristics of food waste fermentation to maximize lactic acid production. Food waste was enzymatically hydrolyzed and fermented by Lactobacillus pentosus. Key fermentation variables, including nitrogenous nutrient supplementation, initial sugar concentration, and pH, were investigated in batch fermentation to unveil their effects on fermentation titer, yield, and productivity. The results showed that supplementation of 0.25% (w/v%) yeast extract and peptone to the food waste fermentation media significantly improved fermentation titer and productivity, but further increase in the supplementation level did not improve fermentation. Increasing the initial sugar concentration from 40 g/L to 100 g/L increased the fermentation titer from 41.0 g/L to 93.0 g/L and productivity from 0.34 g/L/h to 0.76 g/L/h. pH 6.0 was the optimal pH for the fermentation. At the optimal conditions, food waste fermentation resulted in the highest fermentation titer, yield, and productivity of 106.7 g/L, 1.12 g/g, and 3.09 g/L/h, respectively. The high fermentation yield of 1.12 g/g might be explained by the extra lactic acid production from unidentified compounds in food waste hydrolysates. By applying fed-batch fermentation, the lactic acid concentration reached 157.0 g/L with a yield and overall productivity of 0.92 g/g and 2.0 g/L/h, respectively. Based on the mass balance, a total of 251 kg lactic acid was produced from 1000 kg food waste. PRACTICAL APPLICATION: Food waste is one of the largest municipal solid wastes in the US, and most food waste ends up in landfills, causing significant economic losses and environmental concerns. In this study, we developed a fermentation process to convert food waste into biorenewable lactic acid and demonstrated that food waste is a superior feedstock for fermentation due to its embedded nutrients. Moreover, due to the embedded nutrients in food waste, the supplementation of yeast extract and peptone to fermentation can be reduced by over 50%, which can reduce the operating cost of lactic acid fermentation on an industrial scale.
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- 2022
25. A Deep Learning Method for MiRNA/IsomiR Target Detection
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Amlan Talukder, Wencai Zhang, Xiaoman Li, and Haiyan Hu
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MicroRNAs ,Multidisciplinary ,Deep Learning ,RNA, Messenger - Abstract
MotivationAccurate identification of microRNA (miRNA) targets at base-pair resolution has been an open problem for over a decade. The recent discovery of miRNA isoforms (isomiRs) adds more complexity to this problem. Despite the existence of many methods, none considers isomiRs, and their performance is still suboptimal. We hypothesize that by taking the isomiR-mRNA interaction into account and applying a deep learning model to study miRNA-mRNA interaction features, we may improve the accuracy of miRNA target predictions.ResultsWe developed a deep learning tool called DMISO to capture the intricate features of miRNA/isomiR-mRNA interactions. Based on 10-fold cross-validation, DMISO showed high precision (95%) and recall (90%). Evaluated on three independent datasets, DMISO had superior performance to five tools, including three popular conventional tools and two recently developed deep learning-based tools. By applying two popular feature interpretation strategies, we demonstrated the importance of the miRNA regions other than their seeds and the potential contribution of the RNA-binding motifs within miRNAs/isomiRs and mRNAs to the miRNA/isomiR-mRNA interactions.AvailabilityThe source code and tool are available at http://hulab.ucf.edu/research/projects/DMISO.Contacthaihu@cs.ucf.edu, xiaoman@mail.ucf.eduSupplementary informationSupplementary data are available online.
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- 2022
26. Economic analysis of precious metal recovery from electronic waste through gas-assisted microflow extraction
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Sidi Deng, Zhongqing Xiao, Wencai Zhang, Aaron Noble, Subodh Das, Yuehwern Yih, and John W. Sutherland
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Economics and Econometrics ,Waste Management and Disposal - Published
- 2023
27. A potential application of a novel synergistic catalytic nanocluster system composed of biological enzymes and nanozyme in glycerol bioconversion
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Changbiao Chi, Wencai Zhang, Mianxing Luo, Meng Zhang, and Guo Chen
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General Chemical Engineering ,Environmental Chemistry ,General Chemistry ,Industrial and Manufacturing Engineering - Published
- 2023
28. Strengthening layer with nano-twins in titanium alloy induced by laser surface re-melting: Mechanism of high strength and ductility
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Kunmao Li, Xiaochun Liu, Yujing Liu, Xiang Wu, Wencai Zhang, Junjie Yang, Wei Li, and Shengfeng Zhou
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Mechanics of Materials ,Mechanical Engineering ,General Materials Science ,Condensed Matter Physics - Published
- 2023
29. A 4D-Printed Self-Folding Spatial Mechanism with Pre-Stressed Response Properties
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Wencai Zhang and Duanling Li
- Subjects
Control and Optimization ,Control and Systems Engineering ,Mechanical Engineering ,Computer Science (miscellaneous) ,4D printing ,self-folding ,spatial mechanism ,pre-stressed ,scissor unit ,fused deposition modeling ,Electrical and Electronic Engineering ,Industrial and Manufacturing Engineering - Abstract
Exploring the transformation of spatial mechanisms from their unfolded to controlled folding states to meet the requirements of various application scenarios has long been a hot topic in mechanical structure research. Although conventional spatial mechanisms can be designed to meet almost any application scenario, the design’s complex and excessive combinations of structural components, kinematic pairs, and drive units are unavoidable. It introduces many problems, such as poor reliability, drive complexity, and control difficulties. Based on 4D printing technology, the design of self-folding spatial mechanisms that use pre-stressed response properties under predetermined thermal excitation to achieve different shrinkage ratios integrates the control and drive system and the structural components and kinematic pairs. It brings novel features of self-folding while effectively avoiding many problems associated with conventional mechanical design. Further, the pre-stressed response model introduces the self-folding spatial mechanisms’ excitation, morphing, and driving investigation. Self-folding spatial mechanisms with different shrinkage ratios were prepared via fused deposition modeling, which verified the theoretical analysis and pre-stress response model and the design’s correctness and feasibility by experiments. The existing 4D printing technology lacks a paradigmatic design method in the application field. Contrarily, this work organically combined the conventional mechanical structure design with materials and fabrication via fused deposition modeling. A systematic study of self-folding spatial mechanisms from structural design to morphing control was carried out. This design is expected to introduce a novel paradigm of 4D printing technology in conventional mechanical design and has considerable application prospects in spherical radar calibration mechanisms.
- Published
- 2023
30. Adsorption of cerium (III) by zeolites synthesized from kaolinite after rare earth elements (REEs) recovery
- Author
-
Bin Ji and Wencai Zhang
- Subjects
Environmental Engineering ,Health, Toxicology and Mutagenesis ,Public Health, Environmental and Occupational Health ,Temperature ,Zeolites ,Environmental Chemistry ,General Medicine ,General Chemistry ,Adsorption ,Cerium ,Kaolin ,Pollution - Abstract
REE recovery tests were performed on a kaolinite and the corresponding metakaolinite using pH static leaching method. Test results show that over 90% of REEs were leached from the metakaolinite sample at pH 0.00 and 25 °C, while less than 2% of the major constituents were simultaneously extracted. Therefore, selective leaching of REEs from the metakaolinite was achieved through pH static leaching. The leaching residue was then subjected to alkaline activation for zeolites synthesis. The effects of hydrothermal temperature and incubation period under various alkaline conditions on the synthesis of zeolites were systematically investigated. The phase compositions, textual properties, and morphology of the synthesized products were characterized. Pure zeolite A with 100% relative crystallinity was successfully synthesized at 80 °C for 6 h when using 3 M NaOH as the alkaline activator. While as the synthesis conditions became increasingly harsh, the metastable zeolite A gradually transformed into more stable sodalite, and three types of zeolites, including zeolite A, sodalite, and their mixtures, were obtained. After that, various types of zeolites were applied for Ce
- Published
- 2022
31. Strengthening Layer with Nano-Twins in Titanium Alloy Induce by Laser Surface Re-Melting: Mechanism of High Strength and Ductility
- Author
-
Kunmao Li, Xiaochun Liu, Yujing Liu, Xiang Wu, Wencai Zhang, Junjie Yang, W. Li, and Shengfeng Zhou
- Subjects
History ,Polymers and Plastics ,Business and International Management ,Industrial and Manufacturing Engineering - Published
- 2022
32. Optimal Control Method of Motor Torque Loading Based on Genetic Algorithm
- Author
-
Shaohua Niu, Wencai Zhang, Tianzhen Li, and Gan Zhan
- Published
- 2022
33. Techno-Economic Assessment of Precious Metal Recovery from Electronic Waste Through Gas-Assisted Microflow Extraction
- Author
-
Sidi Deng, Zhongqing Xiao, Wencai Zhang, Aaron Noble, Subodh Das, Yuehwern Yih, and John Sutherland
- Subjects
History ,Polymers and Plastics ,Business and International Management ,Industrial and Manufacturing Engineering - Published
- 2022
34. Effect of Ceramic Types on the Microstructure and Corrosion Behavior of Titanium Matrix Composites Produced by Selective Laser Melting
- Author
-
Jianbo Jin, Shengfeng Zhou, Wencai Zhang, Kunmao Li, Ying Liu, Dongchu Chen, and Lai-Chang Zhang
- Subjects
Mechanics of Materials ,Mechanical Engineering ,Materials Chemistry ,Metals and Alloys - Published
- 2022
35. The effect of lizardite on talc flotation using carboxymethyl cellulose as a depressant
- Author
-
Cheng Liu, Hongqiang Li, Wencai Zhang, Siyuan Yang, and Jie Deng
- Subjects
medicine.drug_class ,Chemistry ,medicine ,Depressant ,General Medicine ,Talc ,Magnesium ion ,Carboxymethyl cellulose ,medicine.drug ,Nuclear chemistry - Published
- 2020
36. Preoperative Prognostic Nutritional Index is a Significant Predictor of Survival in Esophageal Squamous Cell Carcinoma Patients
- Author
-
Li-dong Wang, Luo-sha Zhao, Wencai Zhang, Fankai Xiao, and Lin Wang
- Subjects
0301 basic medicine ,Cancer Research ,medicine.medical_specialty ,Index (economics) ,Esophageal Neoplasms ,MEDLINE ,Nutritional Status ,Medicine (miscellaneous) ,Esophageal squamous cell carcinoma ,Gastroenterology ,03 medical and health sciences ,0302 clinical medicine ,Internal medicine ,medicine ,Humans ,In patient ,Retrospective Studies ,030109 nutrition & dietetics ,Nutrition and Dietetics ,business.industry ,Prognosis ,Nutrition Assessment ,Oncology ,Head and Neck Neoplasms ,030220 oncology & carcinogenesis ,Esophageal Squamous Cell Carcinoma ,business - Abstract
Background: Preoperative assessment of patients is meaningful to predict survival in patients with malignant tumors. The prognostic nutritional index (PNI) is one of the most significant factors re...
- Published
- 2020
37. Enhancement of a Process Flowsheet for Recovering and Concentrating Critical Materials from Bituminous Coal Sources
- Author
-
Rick Honaker, Gerald H. Luttrell, Aaron Noble, Wencai Zhang, Joshua M. Werner, and Roe-Hoan Yoon
- Subjects
Bituminous coal ,Waste management ,business.industry ,Precipitation (chemistry) ,Mechanical Engineering ,geology.rock_type ,Metals and Alloys ,geology ,General Chemistry ,Geotechnical Engineering and Engineering Geology ,Acid mine drainage ,complex mixtures ,Continuous production ,Pilot plant ,Control and Systems Engineering ,Materials Chemistry ,Environmental science ,Coal ,Leachate ,business ,Roasting - Abstract
Recovery of rare earth elements (REE) from coal-related resources has recently received significant interest due to supply concerns and their key roles in critical industries and defense-related technologies. An integrated flowsheet consisting of sorting, crushing/grinding, physical separation, acid leaching, solvent extraction, and selective precipitation was designed to achieve continuous production of rare earth products from various coal-related resources such as coarse refuse and acid mine drainage. A pilot plant was constructed that enabled continuous testing of the circuitry on a range of different coal-based feedstocks. Despite achieving significant success in producing high-grade rare earth oxide products, low REE recovery values and high operational costs necessitated a re-evaluation of the process flowsheet. This article describes the circuitry improvements that were based on both laboratory and pilot plant test results. Roasting as a pre-leach treatment was found to significantly improve the leaching rate and overall REE recovery values. After roasting West Kentucky No. 13 and Fire Clay coal refuse materials at 600 °C, REE recovery increased by 60 and 40 absolute percentage points, respectively. Rare earth concentration in the pregnant leachate solution (PLS) was increased to around 700 ppm prior to solvent extraction using a staged precipitation method. REEs in the precipitate were re-dissolved, purified, and extracted from the PLS using solvent extraction and selective precipitation to values of around 80%. As a result of the improvements, chemical consumption in the acid leaching and solvent extraction processes was significantly reduced. A techno-economical assessment of the improved flowsheet indicated significant commercialization potential.
- Published
- 2019
38. The effect of diesel emulsification using sodium petroleum sulfonate on carbon flotation from fly ash
- Author
-
Wencai Zhang and Cheng Liu
- Subjects
020209 energy ,Sodium ,chemistry.chemical_element ,02 engineering and technology ,010501 environmental sciences ,Coal Ash ,complex mixtures ,01 natural sciences ,Diesel fuel ,chemistry.chemical_compound ,Adsorption ,0202 electrical engineering, electronic engineering, information engineering ,Zeta potential ,Lewis acids and bases ,Waste Management and Disposal ,0105 earth and related environmental sciences ,Minerals ,Chemistry ,technology, industry, and agriculture ,Carbon ,Petroleum ,Sulfonate ,Fly ash ,Particulate Matter ,Nuclear chemistry - Abstract
It is critical to separate carbon from fly ash due to its increasing amount being produced per year and component requirements for secondary utilizations. Flotation is an efficient technique to fulfill this task. Effects of diesel emulsification using sodium petroleum sulfonate on unburned carbon flotation from a fly ash sample were studied. Flotation tests showed that carbon recovery was increased from 41% to 86% using the emulsified collector at the same dosage level (0.5 kg/ton) as diesel. Zeta potential measurements indicated that both the carbon and emulsified collector droplets carried negative charges within the studied pH range. For fly ash particles with high carbon content, adsorption bands of carbonyl bond (C O) were detected in the FTIR spectra, which agreed with the XPS characterization findings. XPS analysis indicated that the emulsified diesel (ED) collector interacted more intensively with the surface carbon-oxygen groups relative to the normal diesel collector. Finally, the improved efficiency of ED is proved to be related to its polar groups and reduced oil droplet size. The polar groups of ED (mainly sulfonate) interacted with the surface oxygen containing groups (e.g., C O and COOH) through hydrogen bonding and Lewis acid base interaction.
- Published
- 2019
39. Frontiers in Chemistry
- Author
-
Feng Rao, Shenxu Bao, Wencai Zhang, and Hong Peng
- Subjects
hydrometallurgy ,Aqueous solution ,Hydrometallurgy ,editorial ,Chemistry ,Capacitive deionization ,removal ,capacitive deionization ,Inorganic chemistry ,Extraction (chemistry) ,General Chemistry ,Inorganic ions ,separation and recovery ,extraction ,QD1-999 - Abstract
Published version
- Published
- 2021
40. A comprehensive review on treatment methods for end-of-life tire rubber used for rubberized cementitious materials
- Author
-
Thien Q. Tran, Blessen Skariah Thomas, Wencai Zhang, Bin Ji, Shiyu Li, and Alexander S. Brand
- Subjects
General Materials Science ,Building and Construction ,Civil and Structural Engineering - Published
- 2022
41. Remote Sensing Evidence for Significant Variations in the Global Gross Domestic Product during the COVID-19 Epidemic
- Author
-
Bin Guo, Wencai Zhang, Lin Pei, Xiaowei Zhu, Pingping Luo, and Weili Duan
- Subjects
GDP prediction ,GM(1, 1) ,GWR ,NPP-VIIRS ,COVID-19 ,Renewable Energy, Sustainability and the Environment ,Geography, Planning and Development ,Building and Construction ,Management, Monitoring, Policy and Law - Abstract
Coronavirus disease 2019 (COVID-19) has been spreading rapidly and is still threatening human health currently. A series of measures for restraining epidemic spreading has been adopted throughout the world, which seriously impacted the gross domestic product (GDP) globally. However, details of the changes in the GDP and its spatial heterogeneity characteristics on a fine scale worldwide during the pandemic are still uncertain. We designed a novel scheme to simulate a 0.1° × 0.1° resolution grid global GDP map during the COVID-19 pandemic. Simulated nighttime-light remotely sensed data (SNTL) was forecasted via a GM(1, 1) model under the assumption that there was no COVID-19 epidemic in 2020. We constructed a geographically weighted regression (GWR) model to determine the quantitative relationship between the variation of nighttime light (ΔNTL) and the variation of GDP (ΔGDP). The scheme can detect and explain the spatial heterogeneity of ΔGDP at the grid scale. It is found that a series of policies played an obvious role in affecting GDP. This work demonstrated that the global GDP, except for in a few countries, represented a remarkably decreasing trend, whereas the ΔGDP exhibited significant differences.
- Published
- 2022
42. Effects of calcination temperature on the occurrence modes of rare earth elements in coal
- Author
-
Qi Li and Wencai Zhang
- Subjects
General Chemical Engineering - Published
- 2022
43. Enhanced insightfulness and neural activation induced by metaphorical solutions to appropriate mental distress problems
- Author
-
Fei Yu, Jing Luo, Wencai Zhang, and Jianxin Zhang
- Subjects
Adult ,Male ,Elementary cognitive task ,Cognitive Neuroscience ,Middle temporal gyrus ,Memory, Episodic ,Inferior frontal gyrus ,Hippocampus ,Experimental and Cognitive Psychology ,Psychological Distress ,050105 experimental psychology ,03 medical and health sciences ,Young Adult ,0302 clinical medicine ,Developmental Neuroscience ,Humans ,0501 psychology and cognitive sciences ,Episodic memory ,Biological Psychiatry ,Problem Solving ,Neural correlates of consciousness ,Brain Mapping ,Fusiform gyrus ,Endocrine and Autonomic Systems ,General Neuroscience ,05 social sciences ,Novelty ,Amygdala ,Magnetic Resonance Imaging ,Psychotherapy ,Neuropsychology and Physiological Psychology ,nervous system ,Neurology ,Metaphor ,Female ,Nerve Net ,Psychology ,030217 neurology & neurosurgery ,Cognitive psychology - Abstract
Although the neural correlates of novelty and appropriateness of creative insight during cognitive tasks have been investigated in several studies, they have not been examined during mental distress in a psychotherapeutic setting. This study aimed to reveal the promoting effects of novelty and appropriateness processing on therapeutic insight in a micro-psychotherapeutic setting. We examined the effects of appropriateness (between-subject factor: appropriateness group, 20 participants; inappropriateness group, 21 participants) by manipulating the preceding negative scenarios that either fit or did not fit the subsequent solutions, and those of novelty (within-subject factor) by varying the linguistic expressions for describing solutions (metaphorical, literal, or problem-restatement). Event-related functional magnetic resonance images were collected. We found the following effects: an interactive effect of the two factors on insightfulness and activation in the bilateral hippocampus and amygdala, right superior frontal gyrus, and left superior/middle temporal gyrus; a simple effect of novelty on activation in the bilateral inferior frontal gyrus, fusiform gyrus, and inferior/middle occipital gyrus; and a simple effect of appropriateness on activation in the left inferior parietal lobule. Our findings indicate that solutions with high novelty and appropriateness generate the highest levels of therapeutic insightfulness as well as the strongest activation in the hippocampus and amygdala, which may be involved in episodic memory encoding.
- Published
- 2021
44. Silencing long intergenic non-protein coding RNA 00987 inhibits proliferation, migration, and invasion of osteosarcoma cells by sponging miR-376a-5p to regulate FNBP1 expression
- Author
-
Lin Yongxin, Zhizhong Li, Zerong Huang, Wencai Zhang, Riliang Cao, and Jianli Shao
- Subjects
0301 basic medicine ,musculoskeletal diseases ,Cancer Research ,Endocrinology, Diabetes and Metabolism ,Cell ,Biology ,03 medical and health sciences ,0302 clinical medicine ,Endocrinology ,lncRNA ,Downregulation and upregulation ,microRNA ,medicine ,Gene silencing ,neoplasms ,FNBP1 ,miRNA ,Gene knockdown ,Osteosarcoma ,Endocrine and Autonomic Systems ,Cell growth ,Research ,medicine.disease ,Molecular medicine ,030104 developmental biology ,medicine.anatomical_structure ,Oncology ,030220 oncology & carcinogenesis ,Cancer research - Abstract
High expression of long intergenic non-protein coding RNA 987 (LINC00987) is strongly associated with low overall survival of osteosarcoma; however, its role in osteosarcoma remains unclear. This study explored the biological function and underlying mechanism of LINC00987 in osteosarcoma. In this study, LINC00987 expression in osteosarcoma cells was analyzed using Cancer Cell Line Encyclopedia and qRT-PCR. The proliferation and migration and invasion in osteosarcoma cells were evaluated using Cell Counting Kit-8 and Transwell assays, respectively. Bioinformatic analysis was used to predict the LINC00987-bound miRNAs and miR-376a-5p-bound mRNAs. Dual-luciferase reporter assays were used to assess the interaction between miR-376a-5p, LINC00987, and forming-binding protein 1 (FNBP1). FNBP1 expression was measured by western blotting. LINC00987 was found to be upregulated in osteosarcoma cells. LINC00987 silencing suppressed proliferation, migration, and invasion of osteosarcoma cells. Additionally, miR-376a-5p expression was downregulated in osteosarcoma cells. miR-376a-5p knockdown reversed the effect of LINC00987 silencing on the biological function of osteosarcoma cell. miR-376a-5p was found to target LINC00987 and FNBP1. FNBP1protein level was increased in osteosarcoma cells; however, it was inhibited by silencing LINC00987 and enhanced by silencing miR-376a-5p. In conclusions, this study suggests LINC00987 silencing inhibits osteosarcoma cell proliferation, migration, and invasion by sponging miR-376a-5p to regulate FNBP1 expression. LINC00987 as a potential therapeutic target for osteosarcoma.
- Published
- 2021
45. Serum concentrations of neonicotinoids and their characteristic metabolites in elderly population from South China: Association with osteoporosis
- Author
-
Hua Zhang, Desheng Wang, Jiang Du, Guodong Sun, Jing Wang, Maota Ou, Junlong Hou, Wencai Zhang, and Kairui Zhu
- Subjects
Male ,China ,Insecticides ,South china ,Osteoporosis ,Population ,Physiology ,Biochemistry ,Neonicotinoids ,Elderly population ,medicine ,Humans ,Adverse effect ,education ,General Environmental Science ,Aged ,education.field_of_study ,business.industry ,Data Collection ,Pest control ,Serum concentration ,Serum samples ,medicine.disease ,Female ,business - Abstract
Neonicotinoids (NEOs) are extensively applied in global agricultural production for pest control but have adverse effects on human health. In this study, the concentrations of six NEOs and three characteristic metabolites were investigated by collecting 200 serum samples from an elderly population in China. Results showed that the NEOs and their metabolites were widely detected (89%-98 %) in the serum samples from the osteoporosis (OP) (n = 120) and non-OP (n = 80) population, and their median concentrations ranged from 0.04 ng/mL to 5.99 ng/mL and 0.01 ng/mL to 2.02 ng/mL, respectively. N-desmethyl-acetamiprid (ACE-dm) was the most abundant NEOs in the serum samples. Gender-related differences were found in concentrations of most NEOs and their metabolites in serum, with males having higher target analytes than females. Significantly (p 0.05) positive correlations were observed among most NEO concentrations, suggesting that exposure source of these substances is common or related. However, associations between the concentrations of characteristic metabolites and their corresponding NEOs were insignificant, probably because the exogenous intake are the primary sources of metabolites of NEOs instead of the internal biotransformation. The associations between NEO concentrations (i.e., ACE-dm, dinotefuran, and olefin-imidacloprid) and OP (OR = 2.33-6.92, 95 % CI = 0.37-16.9, p-trend 0.05) indicate that NEO exposure is correlated with increased odds of prevalent OP. This study is the first to document the profiles of NEOs and their metabolites in serum samples collected from an elderly population in South China and examine the relationships between NEO exposure and OP.
- Published
- 2021
46. Calcination pretreatment effects on acid leaching characteristics of rare earth elements from middlings and coarse refuse material associated with a bituminous coal source
- Author
-
Wencai Zhang and Rick Honaker
- Subjects
chemistry.chemical_classification ,Chemistry ,020209 energy ,General Chemical Engineering ,Organic Chemistry ,Energy Engineering and Power Technology ,02 engineering and technology ,engineering.material ,Sulfide minerals ,law.invention ,Fuel Technology ,020401 chemical engineering ,law ,Environmental chemistry ,0202 electrical engineering, electronic engineering, information engineering ,engineering ,Phosphate minerals ,Kaolinite ,Organic matter ,Calcination ,Leaching (metallurgy) ,Pyrite ,0204 chemical engineering ,Roasting - Abstract
The pretreatment of middlings and coarse refuse material collected from a Pocahontas No.3 coal source using calcination was investigated for the potential of improving the leaching recovery of rare earth elements. Calcination at 600 °C significantly and preferentially improved light REE (LREE) recovery to values in the range of 80–90% using 1.2 M HCl. The positive effect was due to the increased pore diameter and volume as well as thermal decomposition of the minerals associated with the LREEs. Heavy REE recovery was not increased after calcination at 600 °C due to the need for higher temperatures to achieve thermal decomposition of HREE minerals. Furthermore, some HREEs were also associated with sulfide minerals (e.g., pyrite) which were transformed into low-solubility oxides (e.g., hematite) after roasting at 600 °C. Based on the leaching characteristics of the major elements (Fe, Al, Ca and Mg) and REEs along with SEM-EDX data, it was concluded that REEs in the two samples mainly occurred as phosphate minerals. In the middlings, some of the minerals were completely encapsulated by kaolinite, which was less apparent in the coarse refuse. In addition, it was found that a portion of the REEs (10–25%) in the samples were associated with the organic matter and micro-dispersed minerals in the organic matrix, was released after calcination and easily recovered using 0.1 M (NH4)2SO4 solution at pH 5. Scandium primarily occurred in mineral forms with minimum amounts associated with ion-adsorbed clays and organic association.
- Published
- 2019
47. Selective flotation of apatite from calcite using 2-phosphonobutane-1,2,4-tricarboxylic acid as depressant
- Author
-
Hongqiang Li, Cheng Liu, and Wencai Zhang
- Subjects
chemistry.chemical_classification ,Calcite ,medicine.drug_class ,Mechanical Engineering ,02 engineering and technology ,General Chemistry ,Tricarboxylic acid ,010501 environmental sciences ,Geotechnical Engineering and Engineering Geology ,01 natural sciences ,Apatite ,020501 mining & metallurgy ,chemistry.chemical_compound ,Adsorption ,0205 materials engineering ,chemistry ,Control and Systems Engineering ,visual_art ,Zeta potential ,Sodium oleate ,medicine ,visual_art.visual_art_medium ,Depressant ,0105 earth and related environmental sciences ,Nuclear chemistry - Abstract
In this study, 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) was introduced as a depressant for the flotation separation of apatite from calcite. The micro-flotation test results showed that good floatability of both apatite and calcite were obtained at around pH 8.5 when using sodium oleate (NaOl) as collector. Mixed minerals flotation test results showed that an efficient separation of apatite from calcite was achieved using PBTCA as depressant, which presented a selective depression for the calcite. Zeta potential measurements indicated that the addition of PBTCA prior to NaOl did not interfere the interaction between NaOl and apatite while it decreased NaOl adsorption on calcite surface.
- Published
- 2019
48. Flotation separation of smithsonite from calcite using 2-phosphonobutane-1,2,4-tricarboxylic acid as a depressant
- Author
-
Cheng Liu, Wencai Zhang, Yong Liu, Hongqiang Li, and Shaoxian Song
- Subjects
Calcite ,chemistry.chemical_classification ,Smithsonite ,Chemistry ,medicine.drug_class ,General Chemical Engineering ,02 engineering and technology ,Tricarboxylic acid ,engineering.material ,021001 nanoscience & nanotechnology ,chemistry.chemical_compound ,Adsorption ,020401 chemical engineering ,Chemical engineering ,Zeta potential ,Sodium oleate ,medicine ,engineering ,Depressant ,0204 chemical engineering ,0210 nano-technology - Abstract
The effect of depressant 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) on the flotation separation of smithsonite from calcite was studied by micro-flotation and electro-kinetic tests. The micro-flotation results showed that good floatability of both smithsonite and calcite were achieved in the presence of sodium oleate. The depressant PBTCA selectively depressed calcite without interfering the floatability of smithsonite. The mixed minerals flotation results showed that efficiency separation of smithsonite from calcite was achieved using PBTCA as the depressant. Zeta potential measurements indicated that NaOl was able to adsorb on the PBTCA pre-treated smithsonite surface, but failed to adsorb on the PBTCA pre-treated calcite surface.
- Published
- 2019
49. Acid Leaching of Rare Earth Elements from Coal and Coal Ash: Implications for Using Fluidized Bed Combustion To Assist in the Recovery of Critical Materials
- Author
-
Rick Honaker, Wencai Zhang, and Joshua M. Werner
- Subjects
inorganic chemicals ,business.industry ,General Chemical Engineering ,Rare earth ,technology, industry, and agriculture ,Coal mining ,Energy Engineering and Power Technology ,02 engineering and technology ,respiratory system ,021001 nanoscience & nanotechnology ,Pulp and paper industry ,complex mixtures ,Fuel Technology ,020401 chemical engineering ,Fly ash ,Oxidizing agent ,Environmental science ,Fire clay ,Coal ,Fluidized bed combustion ,Leaching (metallurgy) ,0204 chemical engineering ,0210 nano-technology ,business - Abstract
High-temperature pretreatment of coal-based mineral matter in an oxidizing environment significantly enhances the leaching characteristics of rare earth elements (REEs). A research study has found that the temperatures used in fluidized bed combustion (FBC) of coal to produce electricity are near optimum for pretreating the associated mineral matter prior to leaching to maximize the recovery of critical materials. Tests were performed on representative samples collected from preparation plants treating West Kentucky No. 13, Illinois No. 6, and Fire Clay coal seam sources as well as fly ash and bed ash samples from two FBC power plants. Acid leaching tests using 1.2 M HCl at 75 °C were performed on both the coal and the FBC ash samples. Prior to leaching, the coal samples were pretreated at temperatures of 600, 750, and 900 °C in an oxidizing environment to study the effect on leaching characteristics. The results showed that pretreatment at 600 °C for 2 h resulted in a significant increase in REE recovery...
- Published
- 2019
50. Effects of lizardite on pentlandite flotation at different pH: Implications for the role of particle-particle interaction
- Author
-
Wencai Zhang, Cheng Liu, Shaoxian Song, and Hongqiang Li
- Subjects
Chemistry ,Mechanical Engineering ,Pentlandite ,02 engineering and technology ,General Chemistry ,010501 environmental sciences ,Sedimentation ,engineering.material ,Geotechnical Engineering and Engineering Geology ,01 natural sciences ,020501 mining & metallurgy ,Adsorption ,0205 materials engineering ,Chemical engineering ,Control and Systems Engineering ,Slurry ,engineering ,Zeta potential ,Particle ,DLVO theory ,Turbidity ,0105 earth and related environmental sciences - Abstract
Despite that the negative effects of lizardite on pentlandite flotation have been realized, the lizardite effects under different slurry pH have not been sufficiently investigated. Micro-flotation test results showed that pentlandite recovery gradually decreased with the increase in slurry pH when lizardite slime existed. Both electro-kinetic tests and turbidity measurements indicated that hetero-coagulation between the pentlandite and lizardite particles occurred in the entire pH range, which failed to explain the lower recovery at high slurry pH. Zeta potential distribution measurements and sedimentation tests suggested that self-coagulation among lizardite particles occurred at higher pH, which increased the amount of lizardite slime coated on the pentlandite surfaces and thus reducing collector adsorption and flotation recovery. The particle interaction in the pentlandite/lizardite flotation system was investigated using DLVO theory and microscope observation. The findings of the study will contribute to the improvement in pentlandite flotation by regulating the particle interactions.
- Published
- 2019
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