49 results on '"WEI-WEI DU"'
Search Results
2. A Survey on Self-Supervised Learning for Non-Sequential Tabular Data.
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Wei-Yao Wang, Wei-Wei Du, Derek Xu, Wei Wang 0010, and Wen-Chih Peng
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- 2024
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3. DoRA: Domain-Based Self-Supervised Learning Framework for Low-Resource Real Estate Appraisal.
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Wei-Wei Du, Wei-Yao Wang, and Wen-Chih Peng
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- 2023
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4. NYCU_TWD@LT-EDI-ACL2022: Ensemble Models with VADER and Contrastive Learning for Detecting Signs of Depression from Social Media.
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Wei-Yao Wang, Yu-Chien Tang, Wei-Wei Du, and Wen-Chih Peng
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- 2022
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5. Team Triple-Check at Factify 2: Parameter-Efficient Large Foundation Models with Feature Representations for Multi-Modal Fact Verification.
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Wei-Wei Du, Hong-Wei Wu, Wei-Yao Wang, and Wen-Chih Peng
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- 2023
6. ShuttleSet22: Benchmarking Stroke Forecasting with Stroke-Level Badminton Dataset.
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Wei-Yao Wang, Wei-Wei Du, and Wen-Chih Peng
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- 2023
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7. Track2Vec: fairness music recommendation with a GPU-free customizable-driven framework.
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Wei-Wei Du, Wei-Yao Wang, and Wen-Chih Peng
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- 2022
8. RecFormer: personalized temporal-aware transformer for fair music recommendation.
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Wei-Yao Wang, Wei-Wei Du, and Wen-Chih Peng
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- 2022
9. Look Around! A Neighbor Relation Graph Learning Framework for Real Estate Appraisal.
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Chih-Chia Li, Wei-Yao Wang, Wei-Wei Du, and Wen-Chih Peng
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- 2022
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10. Submucosal protuberance caused by a fish bone in the absence of preoperative positive signs: A case report
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Wei-Wei Du, Tao Huang, Guo-Dong Yang, Jing Zhang, Jing Chen, and Ying-Bang Wang
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General Medicine - Published
- 2022
11. Exposure parameters and health risk of Cryptosporidium and Giardia in the recreational water activities for urban residents in China
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Chong-Miao Zhang, Wei-Wei Du, Pengcheng Xu, and Xiaochang C. Wang
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Infection risk ,Health risk assessment ,biology ,Health, Toxicology and Mutagenesis ,Giardia ,Cryptosporidium ,General Medicine ,biology.organism_classification ,Pollution ,Geography ,Environmental health ,Environmental Chemistry ,Health risk ,Risk assessment ,China ,Recreation - Abstract
Knowledge gaps in the exposure parameters for recreational water activities make quantitative risk assessment related to water recreation difficult. Therefore, the annual exposure frequency and single exposure duration for the recreational water activities of residents from ten cities in the North and South of China were investigated. Questionnaire interviews were carried on recreational water activities comprising swimming (SW), boating (BA), playing in interactive fountains (PF), and watching fountains (WF). Quantitative microbial risk assessment for the exposure of urban residents to Cryptosporidium and Giardia was also performed. For the four recreational water activities, the participation rates of urban residents in SW and WF were higher than the others. For SW and BA, the mean annual exposure frequency and single exposure duration for males were significantly higher than those for females. PF and WF showed the opposite. The annual exposure frequency for above 35-year-old residents was higher than that for young residents (18–35 years). However, the single exposure duration for young residents was highest in SW, BA, and PF. The mean annual exposure frequency and single exposure duration for North China residents were higher than those for South China residents in all recreational water activities, except for SW. Overall, the annual exposure frequency and single exposure duration in recreational water activities for all urban residents followed a lognormal distribution. In the four recreational water activities, the total annual infection risk of male exposure to Cryptosporidium was 1.0 × 10-2, with the confidence intervals between 95 and 5% of [4.3 × 10-4, 3.7 × 10-2], whereas that for females was 6.8 × 10-3 and [4.2 × 10-4, 2.4 × 10-2]. Also, the annual infection risk of males to Giardia was 8.8 × 10-3 and [5.1×10-4, 3.2×10-2], and that of females was 5.3 × 10-3 and [4.0 × 10-4, 1.8 × 10-2]. These results demonstrated that SW and PF made the highest contribution to the total annual infection risk. Sensitivity analysis highlighted that the characterization of exposure parameters plays a critical role in health risk assessment, which may provide a scientific basis for recreational water quality standards formulation.
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- 2021
12. [Efficacy of Chimeric Antigen Receptor T Cell in the Treatment of Refractory/Recurrent B Acute Lymphocytic Leukemia in Children]
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Fan, Yang, Tian-Yi, Wang, Wei-Wei, DU, Hai-Long, He, Pei-Fang, Xiao, Ye, Lu, Shao-Yan, Hu, Ben-Shang, Li, and Jun, Lu
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Receptors, Chimeric Antigen ,Adolescent ,T-Lymphocytes ,Antigens, CD19 ,Receptors, Antigen, T-Cell ,Precursor Cell Lymphoblastic Leukemia-Lymphoma ,Immunotherapy, Adoptive ,Methylprednisolone ,Recurrence ,Child, Preschool ,Chronic Disease ,Ferritins ,Humans ,Child - Abstract
To observe the efficacy of chimeric antigen receptor T cell (CAR-T) in the treatment of children with refractory/recurrent B acute lymphocytic leukemia (B-ALL).Thirty-two patients with r/r B-ALL were treated by CAR-T, the recurrence and death respectively were the end point events to evaluate the efficacy and safety of CAR-T.The median age of the patients was 7.5 (2-17.5) years old; 40 times CAR-T were received in all patients and the median number of CAR-T was 0.9×107/kg; efficacy evaluation showed that 2 cases died before the first evaluation. Thirty patients showed that 3, 6, and 9-moth RFS was (96.3±3.6)%, (81.4±8.6)% and (65.3±12.5)%, respectively, while 3, 6, and 9-month OS was all 100%, and 12, 24-month OS was (94.7±5.1)% and (76±12.8)%. BM blasts≥36% before reinfusion and ferritin peak≥2 500 ng/ml within two weeks of CAR-T cell reinfusion were associated with recurrence. Adverse reactions mainly included cytokine release syndrome (CRS) and CART-cell-related encephalopathy syndrome (CRES), CRS appeared in 26 patients within a week of CAR-T cell reinfusion. CRES reaction was detected in 12 patients. Eighteen patients received intravenous drip of tocilizumab, among them, 12 combined with glucocorticoid. CRS and CRES reactions were relieved within one week after treatment. Hormone dosage was related to the duration of remission in patients, and the cumulative dose of methylprednisolone≥8 mg/kg showed a poor prognosis.CAR-T is a safe and effective treatment for r/r B-ALL, most CRS and CRES reactions are reversible. BM blasts ≥36% before reinfusion and cumulative dose of methylprednisolone ≥8 mg/kg after reinfusion both affect the therapeutic effect. Ferritin≥2 500 ng/ml within two weeks after reinfusion is related to disease recurrence and is an independent prognostic risk factor.嵌合抗原受体T细胞治疗儿童难治/复发急性B淋巴细胞白血病的疗效.观察嵌合抗原受体(CAR)T细胞治疗儿童难治/复发急性B淋巴细胞白血病(r/r B-ALL)的疗效及不良反应.回顾性分析32例r/r B-ALL患儿行CAR-T细胞治疗的临床资料,分别以复发、死亡为终点事件,评估CAR-T细胞治疗r/r B-ALL的疗效及安全性.2017年7月至2020年1月,共32例r/r B-ALL患儿接受CAR-T细胞治疗,中位年龄7.5(2-17.5)岁。32例患儿共回输CAR-T细胞40次,回输中位CAR-T细胞总量0.9×107/kg(患儿体重)。结果显示,2例患儿在评估前死亡,其余30例患儿3、6、9个月RFS分别为(96.3±3.6)%、(81.4±8.6)%和(65.3±12.5)%;3、6、9个月OS均为100%,12个月OS(94.7±5.1)%,24个月OS(76±12.8)%。回输前骨髓肿瘤负荷≥36%、CAR-T细胞回输2周内铁蛋白峰值≥2 500 ng/ml与复发相关。不良反应主要为细胞因子释放综合征(CRS)和CAR-T治疗相关脑病综合征(CRES),26例在CAR-T细胞回输1周内出现CRS反应,12例出现CRES反应。18例给予托珠单抗静滴,其中12例联合糖皮质激素,CRS反应及CRES反应经治疗后大多1周内缓解。激素使用剂量与患儿持续缓解时间相关,甲泼尼龙累积剂量≥8 mg/kg预后不佳.CAR-T细胞治疗儿童r/r B-ALL有效且安全,CRS及CRES反应经治疗后均可缓解;回输前骨髓肿瘤负荷≥36%、回输后甲泼尼龙累积剂量≥8 mg/kg预后不佳;回输后两周内铁蛋白峰值≥2 500 ng/ml与疾病复发相关,且为独立预后危险因素.
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- 2022
13. Clinical characteristics and prognosis of pediatric medulloblastoma: a cohort study of 40 patients at Children’s Hospital of Soochow University
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Jun Lu, Zhiheng Li, Wei-Wei Du, Shaoyan Hu, Fan Yang, Ye Lu, and Qin Lu
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Medulloblastoma ,Pediatrics ,medicine.medical_specialty ,business.industry ,Pediatrics, Perinatology and Child Health ,medicine ,medicine.disease ,business - Published
- 2022
14. Comparative effectiveness and safety of intravenous methylprednisolone and tacrolimus monotherapy in ocular myasthenia gravis with unsatisfactory prednisone responses: a retrospective study
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Kai-Yue Zhang, Wei-Wei Duan, Yue-Bei Luo, Yi Li, Jue Hu, and Huan Yang
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Ocular myasthenia gravis ,Intravenous methylprednisolone ,Tacrolimus ,Monotherapy ,Clinical effectiveness ,Initial exacerbation ,Medicine - Abstract
Abstract Background Oral prednisone has been recognized as the first-line therapy for the treatment of ocular myasthenia gravis (OMG). However, its long-term use is complicated by numerous adverse effects and is ineffective for some OMG patients in reaching remission. This study aimed to evaluate the effectiveness and safety of intravenous methylprednisolone (IVMP) and tacrolimus monotherapy for OMG patients with unsatisfactory responses to conventional prednisone therapy. Methods We retrospectively reviewed 57 OMG patients who had not achieved satisfactory improvement after prednisone therapy and thereby received IVMP or tacrolimus monotherapy for at least 6 months. Ocular symptoms were evaluated by the ocular-quantitative MG (QMG) score at each time point. A ≥ 2-point fall in ocular QMG score was defined as the cut-off point to indicate clinical improvement. Logistic regression analysis was performed to identify factors associated with the efficacy of IVMP at discharge. Adverse events were recorded. Results Both IVMP and tacrolimus monotherapy demonstrated significant clinical efficacy, with no statistical differences observed at the study endpoint. The proportions of patients who reached the cut-off point for efficacy evaluation were higher in the IVMP group than in the tacrolimus group (1, 3, and 6 months: 51.7% (15/29) vs 12.0% (3/25), p = 0.002; 69.0% (20/29) vs 40.0% (10/25), p = 0.033; 69.0% (20/29) vs 46.4% (13/28), p = 0.085, respectively). Multivariate logistics analysis showed that high ocular QMG scores at baseline indicated favourable responses to IVMP treatment (OR = 1.781; 95% CI 1.066–2.975; p = 0.028). All the adverse events were transient and tolerable. Conclusion Our findings suggest that both IVMP and tacrolimus monotherapy hold promise as viable treatment options for OMG patients with unsatisfactory responses to oral prednisone. The study supports the safety and effectiveness of both therapies, with IVMP exhibiting faster improvement and favourable efficacy in patients with high ocular QMG scores.
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- 2024
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15. Study of the Residual Stresses Variation into the Sandwich Structure Subjected to Thermomechanical Loading
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Farida Bouafia, Khalid Messaoudi, Wei Wei Du, Fethi Benkhenafou, and Lyes Douadji
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020303 mechanical engineering & transports ,Variation (linguistics) ,Materials science ,0203 mechanical engineering ,Residual stress ,020209 energy ,0202 electrical engineering, electronic engineering, information engineering ,General Materials Science ,02 engineering and technology ,Composite material ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Finite element method - Abstract
The assembly of different types of materials like metals and ceramics forms a structure called sandwich structure, which need advanced techniques to joint it together like the thermo compression. However, the rise of residual stress caused by the discontinuity of nature of this type of sandwich material, like incompatibility of the characteristics, which creates a risk of rupture of the structure and limited the using range of these types of materials. In this paper, we study the bonding of ceramic and metal and we will focus on the role played by the ceramic element in the stress state of ceramic/ metal interface and the stresses evaluation by Finite Element when the structure is subjected to thermo-Mechanical loading.
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- 2018
16. Investigation of the Mechanical and Thermal Properties of LFR PA66 with Graphene Coating on Fibre Surface
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L. Douadji, S.-Y. Jin, Wei Wei Du, and F. Benkhenafou
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Materials science ,Polymers and Plastics ,General Chemical Engineering ,Young's modulus ,02 engineering and technology ,Surface finish ,engineering.material ,010402 general chemistry ,01 natural sciences ,Industrial and Manufacturing Engineering ,law.invention ,symbols.namesake ,Thermal conductivity ,Coating ,law ,Ultimate tensile strength ,Materials Chemistry ,Composite material ,Graphene ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Pultrusion ,symbols ,engineering ,0210 nano-technology ,Raman spectroscopy - Abstract
An industrial fibreglass winding process is employed to apply graphene based sizing (0.2 wt% graphene concentration) on fibreglass surface. Both SEM and Raman spectroscopy characterization have proved that the coating of graphene on fibreglass surface is homogeneous and that the roughness of the fibreglass surface was improved. Long fiberglass-graphene reinforced PA66 pellets are successfully prepared through a pultrusion process. LGF-graphene-PA66 composites are produced following an injection molding process. Thermal conductivity was found to increase from 0.23 W/m · K−1 to 0.67 W/m · K−1 when compared with samples without graphene coating. The tensile strength of LGF-graphene-PA66 is 196 MPa while that of LGF-PA66 is 173 MPa. Tensile modulus is also found to increase to 13.5 GPa from 10.6 GPa after graphene coating. This new graphene coating process is a good method to produce high performance composites.
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- 2018
17. Inhibition of neuroblastoma proliferation by PF-3758309, a small-molecule inhibitor that targets p21-activated kinase 4
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Xiaolu Li, Li-Xiao Xu, Xiaolan Chen, Wei-Wei Du, Guang-Hui Qian, Chun Yang, Yi Wu, Jian Wang, Shaoyan Hu, He Zhao, Jian Pan, Fang Fang, Jun Lu, Xin Ding, Junli Ren, Zhi-Heng Li, Mei Li, Yunyun Xu, and Yan-Fang Tao
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Adult ,Male ,0301 basic medicine ,Cancer Research ,Cell cycle checkpoint ,Cell Survival ,MAP Kinase Signaling System ,Cell ,Biology ,neuroblastoma ,03 medical and health sciences ,Cell Line, Tumor ,Neuroblastoma ,medicine ,Humans ,Pyrroles ,Protein Kinase Inhibitors ,Cell Proliferation ,Neoplasm Staging ,Oncogene ,Kinase ,Cell Cycle ,apoptosis ,Articles ,General Medicine ,Cell cycle ,medicine.disease ,Up-Regulation ,Cell biology ,Gene Expression Regulation, Neoplastic ,PF-3758309 ,growth arrest ,030104 developmental biology ,medicine.anatomical_structure ,p21-Activated Kinases ,Oncology ,PAK4 ,Apoptosis ,Cancer cell ,Cancer research ,Pyrazoles ,Female - Abstract
Neuroblastoma is the most common extracranial solid childhood tumor. Despite the availability of advanced multimodal therapy, high-risk patients still have low survival rates. p21-activated kinase 4 (PAK4) has been shown to regulate many cellular processes in cancer cells, including migration, polarization and proliferation. However, the role of PAK4 in neuroblastoma remains unclear. In the present study, we demonstrated that PAK4 was overexpressed in neuroblastoma tissues and was correlated with tumor malignance and prognosis. To investigate the function of PAK4 in neuroblastoma, we used a small-molecule inhibitor that targets PAK4, that is, PF-3758309. Our results showed that PF-3758309 significantly induced cell cycle arrest at the G1 phase and apoptosis in neuroblastoma cell lines. Meanwhile, the inhibition of PAK4 by PF-3758309 increased the expression of CDKN1A, BAD and BAK1 and decreased the expression of Bcl-2 and Bax. In addition, we screened the target genes of PAK4 by PCR array and found that 23 genes were upregulated (including TP53I3, TBX3, EEF1A2, CDKN1A, IFNB1 and MAPK8IP2) and 20 genes were downregulated (including TNFSF8, Bcl2-A1, Bcl2L1, SOCS3, BIRC3 and NFKB1) after PAK4 inhibition by PF-3758309. Moreover, PAK4 was found to regulate the cell cycle and apoptosis via the ERK signaling pathway. In conclusion, the present study demonstrated, for the first time, the expression and function of PAK4 in neuroblastomas and the inhibitory effect of PF-3758309, which deserves further investigation as an alternative strategy for neuroblastoma treatment.
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- 2017
18. Inhibiting PLK1 induces autophagy of acute myeloid leukemia cells via mammalian target of rapamycin pathway dephosphorylation
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Yanhong Li, Guang-Hui Qian, Jian Wang, Shaoyan Hu, Xing Feng, Wei-Qi He, Li-Xiao Xu, Xie Yi, Jian Pan, Mei Li, Yan-Fang Tao, Zhi-Heng Li, Xiaolu Li, Wei-Wei Du, Yi-Ping Li, Gang Li, Fang Fang, Jun Lu, Junli Ren, and Yi Wu
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Male ,0301 basic medicine ,Cancer Research ,Cell Cycle Proteins ,Mice ,0302 clinical medicine ,hemic and lymphatic diseases ,Tumor Cells, Cultured ,Phosphorylation ,RNA, Small Interfering ,Child ,Reverse Transcriptase Polymerase Chain Reaction ,TOR Serine-Threonine Kinases ,RO3280 ,Myeloid leukemia ,Articles ,General Medicine ,Cell cycle ,Prognosis ,Cell biology ,Survival Rate ,Leukemia, Myeloid, Acute ,mTOR phosphorylation ,Oncology ,030220 oncology & carcinogenesis ,polo-like kinase 1 ,Female ,Signal Transduction ,autophagy ,Programmed cell death ,Blotting, Western ,Protein Serine-Threonine Kinases ,Biology ,Real-Time Polymerase Chain Reaction ,03 medical and health sciences ,Proto-Oncogene Proteins ,Biomarkers, Tumor ,Animals ,Humans ,RNA, Messenger ,Protein kinase A ,PI3K/AKT/mTOR pathway ,Cell Proliferation ,Neoplasm Staging ,BI2536 ,Autophagy ,pediatric acute myeloid leukemia ,Xenograft Model Antitumor Assays ,030104 developmental biology ,Cancer research ,K562 cells - Abstract
Decreased autophagy is accompanied by the development of a myeloproliferative state or acute myeloid leukemia (AML). AML cells are often sensitive to autophagy‑inducing stimuli, prompting the idea that targeting autophagy can be useful in AML cytotoxic therapy. AML NB4 cells overexpressing microtubule-associated protein 1 light chain 3-green fluorescent protein were screened with 69 inhibitors to analyze autophagy activity. AML cells were treated with the polo-like kinase 1 (PLK1) inhibitors RO3280 and BI2536 before autophagy analysis. Cleaved LC3 (LC3-II) and the phosphorylation of mammalian target of rapamycin (mTOR), adenosine monophosphate-activated protein kinase, and Unc-51-like kinase 1 during autophagy was detected with western blotting. Autophagosomes were detected using transmission electron microscopy. Several inhibitors had promising autophagy inducer effects: BI2536, MLN0905, SK1-I, SBE13 HCL and RO3280. Moreover, these inhibitors all targeted PLK1. Autophagy activity was increased in the NB4 cells treated with RO3280 and BI2536. Inhibition of PLK1 expression in NB4, K562 and HL-60 leukemia cells with RNA interference increased LC3-II and autophagy activity. The phosphorylation of mTOR was reduced significantly in NB4 cells treated with RO3280 and BI2536, and was also reduced significantly when PLK1 expression was downregulated in the NB4, K562 and HL-60 cells. We demonstrate that PLK1 inhibition induces AML cell autophagy and that it results in mTOR dephosphorylation. These results may provide new insights into the molecular mechanism of PLK1 in regulating autophagy.
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- 2017
19. Experimental and numerical study of internal erosion around submerged defective pipe
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Wei Wei Du, Mao Zhu Peng, Zili Li, Shi Jin Feng, and Dong-Mei Zhang
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Soil model ,education ,0211 other engineering and technologies ,02 engineering and technology ,Building and Construction ,010502 geochemistry & geophysics ,Geotechnical Engineering and Engineering Geology ,Governing equation ,01 natural sciences ,Finite element method ,Hydraulic head ,Soil skeleton ,Soil water ,Erosion ,Internal erosion ,Geotechnical engineering ,Geology ,021101 geological & geomatics engineering ,0105 earth and related environmental sciences - Abstract
Ground subsidence induced by internal erosion around defective sewer pipes commonly occurs in urban areas of many cities over the world, which has caused substantial socioeconomic loss. Professional pipe design, inspection and maintenance demand a comprehensive understanding of the internal erosion mechanism due to defective pipes. This paper conducts a series of experimental, theoretical and numerical analyses aiming to propose a new method quantifying the erosion process around defective pipes. In this study, a laboratory experimental test of internal erosion was conducted using gap-graded soils, followed by the derivation of a nonlinear incremental governing equation for quantifying the erosion rate of soil on the basis of experimental results. After that, a new type of element was established to incorporate the proposed governing equation of erosion into Mohr-Coulomb constitutive soil model. Finally, this new element was adopted in a 2D soil-fluid coupled finite element analysis of soil erosion due to pipe defect. Results indicate that (1) the hydraulic head greatly affects cavity formation and soil loss, whereas the defect types have a little effect on eroded region, (2) visual images during test show that the soil erosion gradually slows down and eventually stabilizes along with the forming of soil skeleton, (3) the numerical results match well with the experimental results, demonstrating the effectiveness of both the theoretical method and numerical tool for the analysis of soil erosion around defective pipes.
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- 2020
20. Model Test of Seepage Erosion Around Defective Buried Pipelines
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Dong-Mei Zhang, Cheng-Peng Gao, and Wei-Wei Du
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Pipeline transport ,Hydraulic head ,Soil test ,Water table ,Model test ,Internal erosion ,Geotechnical engineering ,Grading (engineering) ,Soil saturation ,Geology - Abstract
In recent years, the cave-in on roads frequently occurs in urban area to threaten the city safety, which is usually initiated by the ground cavity due to internal erosion around defective buried pipelines. In order to study the mechanism of internal erosion inducing cavity, the model tests are performed using gap grading soil samples. The effects of soil saturation, hydraulic head, initial soil grading and defect size of the pipeline on the internal erosion are studied with eight model tests. The erosion is characterized in terms of the erosion area and cavity formation during erosion. The test results show that the erosion can get stable due to the support of coarse particle skeleton in gap grading soil. The erosion areas can be classified into three forms of gravel area, flow area and cavity according to erosion state. Furthermore, the erosion area especially the cavity in saturated soil is more extensive than that in unsaturated soil. Besides, no hidden cavity forms in unsaturated soil, but the surface settlement. The higher hydraulic head induces bigger erosion area and cavity forms at the water table. More initial fine-sand content means more sand loss, leading to more significant soil deformation. While bigger defect size may cause a little more erosion amount, the effects on cavity is not significant. Finally, the mechanism of internal erosion and cavity formation are interpreted from the microscopic and macroscopic aspects.
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- 2018
21. A New Way to Uniform Microwave Treatment of Epoxy Glass
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Wei Wei Du, Hong He, Cheng Li, Lyes Douadji, and Fethi Benkhenafou
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Materials science ,Mechanical Engineering ,Attenuation ,Composite number ,Dielectric ,Epoxy ,Condensed Matter Physics ,Electromagnetic radiation ,Mechanics of Materials ,Leaf spring ,visual_art ,Dielectric heating ,visual_art.visual_art_medium ,General Materials Science ,Composite material ,Microwave - Abstract
This work is part of an ambitious project aiming to manufacture epoxy-glass leaf spring by microwave processing. Physical properties of final products to be manufactured, in particular the mechanical properties, are directly dependent on uniform repartition of microwave source heating during the treatment. The major problem in microwave processing, however, is attenuation of microwave source. We propose Dielectric Effect of Attenuation Inversion of the Electromagnetic Waves (DEAI) as a new way for uniform treatment of epoxy glassmicrowave energy. This solution utilizes dielectric properties of the mold to control the microwave heat source attenuation into the composite to be treated. Electromagnetic modelling of microwave process was carried out and validated by experimental results. The results show that microwave source heating attenuation can be controlled and inversed. We demonstrated uniform treatment on epoxy-glass parts ca. 100 cm long by means of compensation of microwave source attenuation.
- Published
- 2015
22. Contribution to Study of the Sintering Mechanism
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Wei Wei Du and Lyes Douadji
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Surface tension ,chemistry.chemical_compound ,Materials science ,chemistry ,Powder metallurgy ,Scientific method ,Heat transfer ,Flow (psychology) ,Metallurgy ,Sintering ,Particle ,General Medicine ,Polyvinylidene fluoride - Abstract
In all process based in powder and in particular in the rotational moulding process, the major physical phenomenon during the flow of the powders is the sintering and grains growth. The sintering is the formation of only one particle starting from two or many particles under the effect of the temperature and the forces of surface tension. We interest in this study in particular at the mechanism of Polyvinylidene fluoride (PVDF) sintering. The results of this study can enable us to maximize our knowledge about sintering mechanism and enable us to determine parameters such as the speed of sintering for the optimization of the process.
- Published
- 2014
23. Practice of and Reflection on Medical Consortium by County-Level Hospitals Trusted to Provincial-Level Leading Hospitals
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Wei-Wei Du, Jin Chen, Hong Hu, and Jia-Long Zhu
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Reflection (computer programming) ,business.industry ,Service level ,Referral system ,Business ,Internal governance ,Public relations ,County level ,health care economics and organizations ,Municipal level ,Management - Abstract
Building new regional medical consortium in the model of trusting county-level hospitals to provincial-level large-scale public third-level grade-A hospitals can optimize the allocation of medical resources, promote two-way referral system and rational shunting of patients, and drive multi-sited practice of physicians. Furthermore, it can constantly improve regional medical service level, and achieve the goal of medical reform—comprehensive reform of county-level public hospitals. By introducing general situation where two county-level hospitals are trusted to Hubei Provincial People’s Hospital, this study analyses its operation performance and existing problems, and then puts forwards developmental countermeasures and recommendations for provincial-level hospitals to hold county-level hospitals in trust to build a medical consortium, including driving reorganization of medical resources, making clear roles of all the parties concerned, clarifying internal governance structure of hospitals under trust, reinforcing policy guidance, enhancing internal developmental force of trusteeship, intensifying supporting, and improving functions of medical consortium incrementally.
- Published
- 2017
24. Practice and Reflections on 'Direct-billing Service' of Commercial Health Insurance in Hospitals: Experience of a Provincial-level Hospital in China
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Jia-Long Zhu, Jin Chen, Hong Hu, and Wei-Wei Du
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Service (business) ,Finance ,Actuarial science ,Health management system ,business.industry ,media_common.quotation_subject ,Self-insurance ,Big data ,010501 environmental sciences ,Payment ,01 natural sciences ,Municipal level ,03 medical and health sciences ,0302 clinical medicine ,Health insurance ,030212 general & internal medicine ,Business ,China ,health care economics and organizations ,0105 earth and related environmental sciences ,media_common - Abstract
The direct-billing collaboration between medical institutions and commercial health insurance institutions is an internationally applied method of commercial health insurance claims. This paper discusses the reasons why the direct-billing service of medical institutions is currently limited, including the trivial size of commercial health insurance and hospitals’ concern on cost control, by taking the practice of direct-billing service in a certain hospital in Wuhan as an example. It also summarizes the problems encountered in the operation, including the refusal to medical payment, the risks in excessive medical care, the increasing costs of medical institutions and acting against the equalization principle of medical service. The author then proposes several advices on the direct-billing service operated by hospitals, in terms of strengthening the risk control, taking part into the “Big Data” health management, reforming HIS system united with commercial insurance institutions and adjusting the pricing system of direct-billing service.
- Published
- 2017
25. Molecular mechanism of G1 arrest and cellular senescence induced by LEE011, a novel CDK4/CDK6 inhibitor, in leukemia cells
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Jian Pan, Jian Wang, Na-Na Wang, Xing Feng, Yan-Fang Tao, Zhi-Heng Li, Yunyun Xu, Yi Wu, Guang-Hui Qian, Li-Xiao Xu, Mei Li, Xiaolu Li, Jun Lu, Junli Ren, Wei-Wei Du, Wei-Qi He, Fang Fang, Yanhong Li, Yi-Ping Li, and Shaoyan Hu
- Subjects
0301 basic medicine ,Senescence ,Cancer Research ,Cell ,Biology ,Cellular senescence ,Arraystar Human LncRNA array ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,medicine ,Genetics ,CDK4/6 ,LEE011 ,Propidium iodide ,Acute leukemia ,Leukemia ,Cell growth ,Cell cycle ,medicine.disease ,Cell biology ,030104 developmental biology ,medicine.anatomical_structure ,chemistry ,Oncology ,030220 oncology & carcinogenesis ,biology.protein ,Cyclin-dependent kinase 6 ,Primary Research - Abstract
Background Overexpression of cyclin D1 dependent kinases 4 and 6 (CDK4/6) is a common feature of many human cancers including leukemia. LEE011 is a novel inhibitor of both CDK4 and 6. To date, the molecular function of LEE011 in leukemia remains unclear. Methods Leukemia cell growth and apoptosis following LEE011 treatment was assessed through CCK-8 and annexin V/propidium iodide staining assays. Cell senescence was assessed by β-galactosidase staining and p16INK4a expression analysis. Gene expression profiles of LEE011 treated HL-60 cells were investigated using an Arraystar Human LncRNA array. Gene ontology and KEGG pathway analysis were then used to analyze the differentially expressed genes from the cluster analysis. Results Our studies demonstrated that LEE011 inhibited proliferation of leukemia cells and could induce apoptosis. Hoechst 33,342 staining analysis showed DNA fragmentation and distortion of nuclear structures following LEE011 treatment. Cell cycle analysis showed LEE011 significantly induced cell cycle G1 arrest in seven of eight acute leukemia cells lines, the exception being THP-1 cells. β-Galactosidase staining analysis and p16INK4a expression analysis showed that LEE011 treatment can induce cell senescence of leukemia cells. LncRNA microarray analysis showed 2083 differentially expressed mRNAs and 3224 differentially expressed lncRNAs in LEE011-treated HL-60 cells compared with controls. Molecular function analysis showed that LEE011 induced senescence in leukemia cells partially through downregulation of the transcriptional expression of MYBL2. Conclusions We demonstrate for the first time that LEE011 treatment results in inhibition of cell proliferation and induction of G1 arrest and cellular senescence in leukemia cells. LncRNA microarray analysis showed differentially expressed mRNAs and lncRNAs in LEE011-treated HL-60 cells and we demonstrated that LEE011 induces cellular senescence partially through downregulation of the expression of MYBL2. These results may open new lines of investigation regarding the molecular mechanism of LEE011 induced cellular senescence. Electronic supplementary material The online version of this article (doi:10.1186/s12935-017-0405-y) contains supplementary material, which is available to authorized users.
- Published
- 2017
26. A Study on Migration of Contamination from Paper Cups to Ethanol by HPLC
- Author
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Ya Ning Xu, Jian Qing Wang, Qing Qing Yue, Wei Wei Du, and Ying Wang
- Subjects
Pollutant ,chemistry.chemical_compound ,Ethanol ,Chromatography ,Waste management ,Chemistry ,Dibutyl phthalate ,Benzophenone ,Alcohol ,General Medicine ,Contamination ,High-performance liquid chromatography - Abstract
The main objective was to develop a technique by high performance liquid chromatography to study migration of contamination from packaging material of three samples of paper cups with different properties. Dibutyl phthalate (DBP) and benzophenone (BP), which are the most commonly used in paper packaging material, are regarded as stimulant of contamination, alcohol is selected as food stimulant.The obtained data indicated that migration has a relationship with the type of contamination,concentration of food stimulant.Analysed by1stOptsoftware with experimental result, the rule of migration of DBP and BP can be studied.
- Published
- 2013
27. Study the Micromechanical Behavior of PLA Film
- Author
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M. Madani, Wei Wei Du, Lyes Douadji, Abbas Tcharkhtchi, and Fethi Benkhenafou
- Subjects
chemistry.chemical_classification ,Work (thermodynamics) ,Morphology (linguistics) ,Materials science ,Molar mass ,General Engineering ,Polymer ,Plasticity ,Crystallinity ,chemistry.chemical_compound ,chemistry ,Spherulite ,Polylactic acid ,Composite material - Abstract
The objective of this work is the study of the mechanical stress influence on the structural evolution. In particular, we studied the initiation and the plasticity mechanisms propagation of a semicrystalline polymer at small scales. The material is polylactic acid (PLA) film with average molar mass of 199 kg/mole and a thickness of 200 μm. The lamellate morphology of this material is very heterogeneous: in given area and packages of different orientation plates, they are spherulites α and β which have a different mechanical behaviour on a lamellate scale.
- Published
- 2013
28. Study on Torque Converter with Adjustable Guide Vanes of Hydrodynamic Speed-Adjusting Wind Turbines
- Author
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Wen Xing Ma, Wei Cai, Chun Bao Liu, and Wei Wei Du
- Subjects
Engineering ,Stall torque ,Wind power ,Direct torque control ,Control theory ,business.industry ,General Engineering ,Torque sensor ,business ,Damping torque ,Torque converter ,Turbine ,Continuously variable transmission - Abstract
As the core component of hydrodynamic variable speed transmission system of wind turbine, there exist some problems in domestic adjustable torque converter, such as simple products and poor performances. A three-dimensional flow simulation method is employed to design the adjustable torque converter. Circulatory circle is determined after the structure optimization of the torque converter. The blades are designed by the conformal projection law, and then the adjustable device’s structure is determined. The performance of torque converter with the variation guide vanes is analyzed by using numerical simulation. The calculated results show that the new torque converter could meet the needs of the wind turbine transmission system.
- Published
- 2012
29. A novel sphingosine kinase 1 inhibitor (SKI-5C) induces cell death of Wilms' tumor cells
- Author
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Zhi-Heng, Li, Yan-Fang, Tao, Li-Xiao, Xu, He, Zhao, Xiao-Lu, Li, Fang, Fang, Yi, Wu, Jun, Lu, Yan-Hong, Li, Wei-Wei, Du, Jun-Li, Ren, Yi-Ping, Li, Yun-Yun, Xu, Xing, Feng, Jian, Wang, Wei-Qi, He, and Jian, Pan
- Subjects
Original Article ,human activities - Abstract
Sphingosine kinase 1 (SphK1) is over-expressed in many cancers and therefore serves as a biomarker for cancer prognosis. SKI-5C is a new SphK1 inhibitor, and until now its molecular function in Wilms’ tumor cells remained unknown. Here, using CCK-8 and nude mice experiments we assessed cell growth in Wilms’ tumor cell lines (SK-NEP-1 and G401) in vitro and in vivo. We demonstrated that SphK1 is highly expressed in SK-NEP-1 and G401 cells, and through annexin V/propidium iodide staining and flow cytometry analysis, we detected cell apoptosis. Treatment with SKI-5C inhibited proliferation and induced apoptosis of SK-NEP-1 and G401 cells in a dose-dependent manner. Moreover, SKI-5C treatment inhibited the growth of SK-NEP-1 xenograft tumors in nude mice, with few side effects. Our microarray analysis revealed that SKI-5C-treated SK-NEP-1 cells mostly downregulated PRKACA and significantly inhibited phosphorylation of ERK1/2 and NF-κB p65. These results imply that SKI-5C induces apoptosis of SK-NEP-1 cells through the PRKACA/MAPK/NF-κB pathway. While, further research is required to determine the underlying details, these results provide new clues for the molecular mechanism of cell death induced by SKI-5C and suggest that SKI-5C may act as new candidate drug for Wilms’ tumor.
- Published
- 2016
30. Effective Energy Saving Research on the Air Exchange Rate of Residential Buildings in Guangzhou Based on the Software DeST-h
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Wei Wei Du, Li Hua Zhao, and Cui Cui Qin
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Engineering ,Waste management ,business.industry ,Cooling load ,Air exchange ,General Engineering ,Environmental engineering ,Energy recovery ventilation ,law.invention ,Software ,Volume (thermodynamics) ,Air conditioning ,law ,Ventilation (architecture) ,business ,Efficient energy use - Abstract
Reasonable determination of indoor ventilation rates are the main content of residential ventilation designs, and can save consumption by air conditioners. Firstly, the energy saving potential of ventilation cooling technology in Guangzhou is analyzed in this paper. The cooling load of a residential building in Guangzhou with different air exchange rates is simulated by the DeST-h after indoor heating quantity of different rooms is set. The energy saving rate is analyzed, the functional relation between energy saving rate of ventilation and air exchange rate is obtained using the linear-regression analysis method. After a comprehensive consideration of various factors, including variation of energy efficiency, room volume, air outlet size, and that the maximum air exchange rates of different rooms are fixed.
- Published
- 2011
31. Bilayer metallic nanofilms as broadband antireflection coatings in terahertz optical systems
- Author
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Xiao Li Tang, Huai Wu Zhang, Wei en Lai, Wei Wei Du, Yao hua Zhu, and Qi ye Wen
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Materials science ,business.industry ,Terahertz radiation ,Bilayer ,Physics::Optics ,Metal Nanoparticles ,Optical Devices ,Membranes, Artificial ,Atomic and Molecular Physics, and Optics ,Terahertz spectroscopy and technology ,Reflection (mathematics) ,Optical coating ,Optics ,Absorption, Physicochemical ,Attenuation coefficient ,Broadband ,Scattering, Radiation ,business ,Refractive index ,Terahertz Radiation ,Lenses - Abstract
We present the potential of ultrathin bilayer metallic nanofilms for use as broadband antireflection coatings in the terahertz frequency range. The metallic layers are modeled using a wave-impedance matching approach. The experimental and theoretical results are in good agreement. Further, a novel method using our broadband antireflection coatings is proposed to eliminate unwanted reflections that interfere with the important reflection from the sample in terahertz reflection measurement. The proposed method significantly improves the calculation of the optical properties of liquid and biological samples.
- Published
- 2014
32. Compensation of microwave-source heating attenuation into epoxy-glass composites: Experimental results
- Author
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Cheng Li, Wei Wei Du, and Lyes Douadji
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Materials science ,Polymers and Plastics ,Attenuation ,Composite number ,General Chemistry ,Epoxy ,Dielectric ,Electromagnetic radiation ,Surfaces, Coatings and Films ,Compensation (engineering) ,Leaf spring ,visual_art ,Materials Chemistry ,visual_art.visual_art_medium ,Composite material ,Microwave - Abstract
The final goal of this study was to manufacture an epoxy–glass leaf spring by microwave processing. The physical properties of the final part to be manufactured, in particular, the mechanical properties, were directly related at the repartition of microwave-source heating during the treatment. The major problem in microwave processing, however, is the attenuation of the microwave source. Here, we propose a dielectric effect of attenuation inversion of the electromagnetic waves as a new method for the uniform treatment of epoxy–glass by microwave energy. This solution used the dielectric properties of the mold to control the microwave-heat-source attenuation into the composite to be treated. Many experiments were carried out to validate the proposed solution. The results show that the microwave-source heating attenuation could controlled and inversed. We demonstrated the uniform treatment of epoxy–glass parts about 100 cm long by means of the compensation of microwave-source attenuation. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39908.
- Published
- 2013
33. [The assessment of reliability and validity of musculoskeletal questionnaire]
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Wei-wei, Du, Sheng, Wang, Jian-xin, Wang, Li-hua, He, Shan-shan, Wu, Jing-yun, Li, Lei, Yang, Shan-fa, Yu, Zhao-lin, Xia, Ling-ping, Li, An-ping, Zhu, Xiao-feng, Liu, and Zi-hua, Zhu
- Subjects
Surveys and Questionnaires ,Humans ,Musculoskeletal Diseases ,Factor Analysis, Statistical ,Occupational Health - Abstract
To evaluate the reliability and validity of musculoskeletal questionnaire.A self-administered modified musculoskeletal questionnaire was used to investigate 12 098 workers from eight occupations, i.e. coal mining, petroleum, metallurgical, mechanical manufacturing, chemical, garment and railroad transportation industries and education. The Cronbach's α coefficient, analysis of covariance and multiple logistic regression were used to assess the reliability and validity of musculoskeletal questionnaire.The consistent test between total items of Musculoskeletal Questionnaire and each factor showed that the range of Cronbach's α was 0.52 ∼ 0.92, except from vibration factor, other Cronbach's α was more than 0.7. All 55 items of Musculoskeletal Questionnaire were subjected to factor analysis, and ten latent factors were identified, which explained 55.17% of the total variance. The potentially hazardous working conditions could be categorized into seven dimensions (force, dynamic load, static load, repetitive load, climate factors, vibration exposure and environmental ergonomic factor), which consisted with the theory model. The results of covariance analysis indicated that there were significant difference among 7 dimension indices in different jobs (P0.01).The modified Musculoskeletal Questionnaire is a valid and reliable tool for measuring musculoskeletal workload.
- Published
- 2012
34. [Investigation of occupational hazards of ultraviolet radiation and protective measures for workers in electric welding]
- Author
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Yan, Xu, Man-man, Gong, Jiao, Wang, Li-hua, He, Sheng, Wang, Wei-wei, Du, Long-lian, Zhang, Sen, Lin, Xue-mei, Dong, and Ru-gang, Wang
- Subjects
Adult ,Male ,China ,Adolescent ,Ultraviolet Rays ,Middle Aged ,Young Adult ,Radiation Protection ,Occupational Exposure ,Surveys and Questionnaires ,Humans ,Industry ,Female ,Welding ,Radiation Injuries ,Automobiles - Abstract
To investigate and analyze the occupational hazards of ultraviolet radiation, protective measures and related factors for typical symptoms among workers in electric welding, and to provide basic information for revision of the occupational standards of UV.Questionnaires and physical examinations were used in this investigation. A total of 828 workers from four vehicle manufacturers in Beijing and Guangdong Province were selected. Corresponding analyses were conducted with SPSS 16.0 statistic software.The top three injuries of faces and hands were burning tingling (48.7%41.3%), itch of skin (39%34.9%) and pigmentation (31.9%24.5%).The major injuries of eyes were ophthalmodynia (61.5%) , photophobia and tearing (61.4%), and blurred vision (50.2%). The incidences of facial and hands burning tingling, hands flushing, hands macula and papula were significantly different between the welders and auxiliary workers (P0.05). The differences of facial and hands burning tingling, flushing, facial disesthesia and anaesthesia, symptoms and signs of eyes were significant in different working years groups (P0.05). The top three usages of protective measures were welding masks (87.2%), gloves (84.3%) and glasses (65.9%). Except for UV cut cream, the usages of other protective equipments in the auxiliary workers were significantly lower than those in the welders (P0.05). The logistic regression analysis showed that prolonged exposure to arc welding, using argon arc welding and CO(2) gas shielded arc welding, not wearing welding masks, and not using UV cut cream was significantly associated with the increased risk of face burning tingling, and the ORs were 3.894 (6 h to 8 h), 2.665 (4 h to 6 h), 2.052, 1.765, 1.759, 1.833, respectively; working years might be a protective factor, and the OR was 0.440, respectively.The study suggested that the UV radiation produced during welding operations not only caused harm to welders, but also to the auxiliary workers. Protection should be strengthened,for example, wearing welding masks, glasses, etc. Meanwhile automatic welding machines should be adopted by the factories to reduce the exposure time for workers.
- Published
- 2012
35. [Development of China Musculoskeletal Questionnaire and item selection]
- Author
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Shan-shan, Wu, Li-hua, He, Sheng, Wang, Jian-xin, Wang, Jing-yun, Li, Lei, Cao, Wei-wei, Du, Lei, Yang, Shan-fa, Yu, Yan, Zhang, and Chang-yun, Zhang
- Subjects
China ,Surveys and Questionnaires ,Posture ,Humans ,Ergonomics ,Workload ,Musculoskeletal System ,Occupational Health - Abstract
To develop a draft questionnaire (China Musculoskeletal Questionnaire, CMQ) for evaluating of musculoskeletal workload and associated potential hazardous working conditions as well as musculoskeletal symptoms of workers in Sitting Posture.Multi-methods, which include the reviewing references, the summarizing results of preliminary studies, the reviewing ergonomic tools, the consulting experts and occupational health workers and the interviewing or discussing with individual workers in sitting posture, were used in developing item pool. The experts and epidemiologists of occupational health scored the importance of every single item in the item pool, and then the survey and sampling were carried out in 325 workers of sitting posture who completed the questionnaire. On the basis of these data, the methods including experts scoring, item analysis, Cronbach's α analysis and factor analysis were synthetically used to select the reliable items which consisted of the formal questionnaire.The standard of the CMQ, which consists of 34 items on musculoskeletal workload and associated potentially hazardous working conditions, can be divided into nine indices (dynamic loads, static loads, repetitive loads, forces-exertion, prolong time, climatic factors, vibration, position and ergonomic environmental factors).The CMQ possesses good content validity, and the items of CMQ are divergent, reliable and typical. However, the reliability and validity of CMQ should be validated.
- Published
- 2012
36. [An assembly line lighting survey analysis and its optimal illumination range research]
- Author
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Xin-ning, Yang, Yan, Xu, Wei-wei, DU, Lei, Cao, Sheng, Wang, Xue-mei, Dong, Hou-han, Lu, Song-gen, Chen, Xiao-ou, Cao, Long-lian, Zhang, and Li-hua, He
- Subjects
Adult ,Male ,China ,Vision Disorders ,Shoes ,Surveys and Questionnaires ,Textile Industry ,Humans ,Industry ,Female ,Electronics ,Workplace ,Lighting ,Occupational Health - Abstract
To investigate and analyze present conditions of the assembling line illumination in our country, and to set the recommended values of illuminance standard.Questionnaires and field surveys were used in this investigation. A total of 752 workers from seven factories in textile, shoes and electronics industries were selected for the questionnaire survey and site measurement, and corresponding analyses made with SPSS 13.0 statistic software.Uniformity of illumination, definition in working face, general satisfactory degrees, asthenopia were significantly correlated with each other. Assembly line illuminances for five different visual characteristics were recommended in this paper. The illuminances were 500-1 000-1 500 lx, 300-500-1 000 lx, 200-300-750 lx, 100-300-500 lx, 50-100-200 lx, respectively.Present conditions of the assembling line illumination are less than satisfactory, uniformity of illumination is on the low side, and there is no assembling line illuminance standard for general satisfactory degrees and asthenopia of workers. The related work should be further improved.
- Published
- 2011
37. [The interactive effect of job task and psychosocial factors on work-related musculoskeletal disorders]
- Author
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Lei, Cao, Wei-wei, DU, Sheng, Wang, Xin-ning, Yang, Li-hua, He, Xue-mei, Dong, Hou-han, Lu, Song-gen, Chen, Xiao-ou, Cao, and Yan, Xu
- Subjects
Adult ,Male ,Occupational Diseases ,Young Adult ,Adolescent ,Surveys and Questionnaires ,Task Performance and Analysis ,Humans ,Female ,Musculoskeletal Diseases ,Middle Aged ,Stress, Psychological - Abstract
To investigate the interactive effect of job task and psychosocial factors on the outcomes of musculoskeletal disorders.653 workers from different type of manufacturing industries and administration office recruited in a cross-sectional epidemiological survey. The Quick Exposure Check (QEC) was applied to assess the ergonomic load of job task, Job Content Questionnaire (JCQ) for identifying psychological characteristics, and Nordic Standardized Questionnaire for investigating outcomes of WMSDs.The prevalence of WMSD in shoulder, upper back, lower back and hand/wrist were significantly different under a variety of combined job task and psychosocial characteristics (P0.05 or P0.01). The more physical and psychological loads, the higher prevalence of WMSDs were revealed. By using multivariate analyses, a potential interactive effect was found in terms of the WMSDs symptoms in hand/wrist, shoulder, upper back and lower back after adjusted by work year, age, and gender.Higher physical load and greater psychosocial risk are more frequent self-reported symptoms of WMSDs than those of lower exposures. Ergonomic intervention strategies aimed at reducing the incidence of WMSDs should not only be focused on control of physical work factors but also psychosocial risks of relevance.
- Published
- 2011
38. [The analysis of factors influencing the work related musculoskeletal disorders of oil drillers]
- Author
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Li-hua, He, Yan, Su, Lei, Cao, Xin-ning, Yang, Wei-wei, DU, Yan, Xu, Jun, Liu, and Sheng, Wang
- Subjects
Adult ,Male ,Workload ,Middle Aged ,Occupational Diseases ,Young Adult ,Petroleum ,Risk Factors ,Humans ,Ergonomics ,Musculoskeletal Diseases ,Morbidity ,Workplace ,Occupational Health - Abstract
To investigate the morbidity and influence factors of work-related musculoskeletal disorders (WMSD) in oil drillers.The modified Nordic Standardized Questionnaire for WMSD was used to perform the epidemiological investigation in 860 oil drillers.The predominant sites of WMSD in the oil drillers were waist (50.6%), neck (29.8%) and shoulder (23.4%), respectively. There were significant differences of the WMSD morbidities in all body sites except for wrist and hip among groups with different working years (P0.05 of P0.01). The WMSD morbidities in the neck, shoulder, back and waist of oil drillers working for more than 40h a week were significantly higher than those of oil drillers working for less than 40 ha week (P0.05). The results of logistic regression analysis revealed that some occupational factors, i.e. keeping stoop and stand for long time, repeating trunk bend, keeping awkward lift posture and lifting the heave objects, were the risk factors for WMSD at waist (P0.05), also some management factors, i.e. overtime work and inadequate rest, were the risk factors for WMSD at waist (P0.05).The WMSD appears to be a serious ergonomic problem in oil drillers, it is necessary to correct working posture, reduce working load, improve organizational management, and encourage a workplace health program with regular work and rest.
- Published
- 2011
39. Relation between the Mechanical Behaviour of a High Strength Steel and the Microstructure in Gigacycle Fatigue
- Author
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Zhiyong Huang, Danièle Wagner, Claude Bathias, Wei Wei Du, Nanjing University of Aeronautics and Astronautics [Nanjing] (NUAA), Laboratoire Energétique Mécanique Electromagnétisme (LEME), and Université Paris Nanterre (UPN)
- Subjects
Materials science ,Low alloyed steel ,Stress ratio ,Scanning electron microscope ,Surface treatment ,02 engineering and technology ,Shot peening ,01 natural sciences ,Carburizing ,0103 physical sciences ,General Materials Science ,Microstructure ,ComputingMilieux_MISCELLANEOUS ,010302 applied physics ,Inclusion ,[PHYS]Physics [physics] ,Mechanical Engineering ,Metallurgy ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Fatigue limit ,Piezoelectricity ,Gigacycle fatigue ,Mechanics of Materials ,Fatigue crack initiation ,Fracture (geology) ,0210 nano-technology - Abstract
Many components can reach or exceed 109 cycles in their service time. When fatigue life is beyond 106, the Wöhler S-N curve was always considered to be asymptotic in horizontal axis, but the fatigue behaviour over 106 cycles can not be neglected. It is not usual to carry out a fatigue test beyond 109 cycles due to the conventional fatigue test’s constraints, time consuming and expensive. High strength steel is widely applied in automobile, railway industry after surface treatment in order to improve performance of material in practice. Carburizing process hardens surface to increase wear and fatigue resistance and shot peening has a beneficial effect on the material fatigue strength from the surface residual compressive stresses. A piezoelectric gigacycle fatigue machine is used to do the tests in gigacycle regime on specimens with different surface treatments. The effect of different surface treatments is investigated in gigacycle regime at a frequency of 20KHz with a fixed stress ratio R=0.1 at room temperature. Moreover, Scanning Electron Microscopy (SEM) observations of fracture surfaces are analyzed to evaluate the mechanism of damage related to surface treatments, microstructure scored inclusion size. The role of inclusions and microstructure is emphasized at 109 cycles.
- Published
- 2010
40. Improved Self-Adaptive Genetic Algorithm with Varying Population Size
- Author
-
Li Huang, Wei-wei Du, and Li-xin Ding
- Subjects
education.field_of_study ,Mathematical optimization ,Computer science ,Population size ,Population-based incremental learning ,Population ,Mutation (genetic algorithm) ,Convergence (routing) ,Crossover ,Genetic algorithm ,Quantitative Biology::Populations and Evolution ,education ,Global optimization - Abstract
The size of the population can be critical in many application of genetic algorithm. And the probabilities of crossover and mutation have an effect on the diversity of population and the convergence of algorithm. In this paper we propose an adaptive method for crossover and mutation probabilities, which change with the varying population size. This algorithm could make great progress in searching for the global optimization. The experimental results indicate some merits of the proposed method.
- Published
- 2009
41. [Multi-central clinical evaluation of ginger-partitioned moxibustion for treatment of leukopenia induced by chemotherapy]
- Author
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Xi-Xin, Zhao, Mei, Lu, Xia, Zhu, Ping, Gao, Yan-Li, Li, Xue-Mei, Wang, Dong-Yang, Ma, Xian-Hui, Guo, Bo-Ying, Tong, Xiao-Li, Yang, Wei-Wei, Du, Shi-Fan, Zhou, Huai-Min, Liu, Peng-Fei, Ran, and Xiao-Rui, Lü
- Subjects
Adult ,Male ,Moxibustion ,Humans ,Antineoplastic Agents ,Female ,Leukopenia ,Ginger ,Middle Aged ,Aged - Abstract
To prove the therapeutic effect of ginger-partitioned moxibustion on leukopenia induced by chemotherapy and effect on life quality of the patient with tumor after chemotherapy.Randomized, controlled, multi-central cooperative method was used and the patients confirmed to the enrolled criteria were divided in-to two groups. The test group were treated with ginger-partitioned moxibustion at Dazhui (GV 14), Geshu (BL 17), Pishu (BL 20), etc.; and the control group with oral administration of Chinese patent medicine.Out of the 221 cases confirmed to program analysis, 113 cases were in the test group and 108 cases in the control group. After 10 days, the cured rate and the effective rate were 84.1% and 66.4% in the test group and 35.2% and 33.3% in the control group, respectively, with very significant differences between the two groups (both P0.01); fifteen days later, the therapeutic effects in the two groups were maintained. The two methods could improve clinical symptoms, with the test group being better than the control group. Any adverse response was not found in the two groups, and the injuries of functions of the heart, lung and kidney induced by chemotherapy had some improvement.The therapeutic effect of ginger-partitioned moxibustion on luekopenia induced by chemotherapy is reliable and is better than oral administration of Chinese patent medicine, with a better duplication.
- Published
- 2008
42. Molecular mechanism of G1 arrest and cellular senescence induced by LEE011, a novel CDK4/CDK6 inhibitor, in leukemia cells.
- Author
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Yan-Fang Tao, Na-Na Wang, Li-Xiao Xu, Zhi-Heng Li, Xiao-Lu Li, Yun-Yun Xu, Fang Fang, Mei Li, Guang-Hui Qian, Yan-Hong Li, Yi-Ping Li, Yi Wu, Jun-Li Ren, Wei-Wei Du, Jun Lu, Xing Feng, Jian Wang, Wei-Qi He, Shao-Yan Hu, and Jian Pan
- Subjects
CELLULAR aging ,CYCLIN-dependent kinase inhibitors ,LEUKEMIA ,GENETIC overexpression ,GALACTOSIDASES ,APOPTOSIS - Abstract
Background: Overexpression of cyclin D1 dependent kinases 4 and 6 (CDK4/6) is a common feature of many human cancers including leukemia. LEE011 is a novel inhibitor of both CDK4 and 6. To date, the molecular function of LEE011 in leukemia remains unclear. Methods: Leukemia cell growth and apoptosis following LEE011 treatment was assessed through CCK-8 and annexin V/propidium iodide staining assays. Cell senescence was assessed by β-galactosidase staining and p16INK4a expression analysis. Gene expression profiles of LEE011 treated HL-60 cells were investigated using an Arraystar Human LncRNA array. Gene ontology and KEGG pathway analysis were then used to analyze the differentially expressed genes from the cluster analysis. Results: Our studies demonstrated that LEE011 inhibited proliferation of leukemia cells and could induce apoptosis. Hoechst 33,342 staining analysis showed DNA fragmentation and distortion of nuclear structures following LEE011 treatment. Cell cycle analysis showed LEE011 significantly induced cell cycle G1 arrest in seven of eight acute leukemia cells lines, the exception being THP-1 cells. β-Galactosidase staining analysis and p16INK4a expression analysis showed that LEE011 treatment can induce cell senescence of leukemia cells. LncRNA microarray analysis showed 2083 differentially expressed mRNAs and 3224 differentially expressed lncRNAs in LEE011-treated HL-60 cells compared with controls. Molecular function analysis showed that LEE011 induced senescence in leukemia cells partially through downregulation of the transcriptional expression of MYBL2. Conclusions: We demonstrate for the first time that LEE011 treatment results in inhibition of cell proliferation and induction of G1 arrest and cellular senescence in leukemia cells. LncRNA microarray analysis showed differentially expressed mRNAs and lncRNAs in LEE011-treated HL-60 cells and we demonstrated that LEE011 induces cellular senescence partially through downregulation of the expression of MYBL2. These results may open new lines of investigation regarding the molecular mechanism of LEE011 induced cellular senescence. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
43. Inhibiting PLK1 induces autophagy of acute myeloid leukemia cells via mammalian target of rapamycin pathway dephosphorylation.
- Author
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YAN-FANG TAO, ZHI-HENG LI, WEI-WEI DU, LI-XIAO XU, JUN-LI REN, XIAO-LU LI, FANG FANG, YI XIE, MEI LI, GUANG-HUI QIAN, YAN-HONG LI, YI-PING LI, GANG LI, YI WU, XING FENG, JIAN WANG, WEI-QI HE, SHAO-YAN HU, JUN LU, and JIAN PAN
- Published
- 2017
- Full Text
- View/download PDF
44. Partial and complete periodic synchronization in coupled discontinuous map lattices
- Author
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Shi-Xian Qu, Ke-Li Yang, Tao Jin, Hui-Yun Chen, and Wei-Wei Du
- Subjects
Physics ,Series (mathematics) ,Mathematical analysis ,Synchronization (computer science) ,General Physics and Astronomy ,Order (ring theory) ,Motion (geometry) ,Expression (mathematics) - Abstract
The partial and complete periodic synchronization in coupled discontinuous map lattices consisting of both discontinuous and non-invertible maps are discussed. We classify three typical types of periodic synchronization states, which give rise to different spatiotemporal patterns including static partial periodic synchronization, dynamically periodic synchronization, and complete periodic synchronization patterns. A special prelude dynamics of partial and complete periodic synchronization motion, which is shown by five separated concave curves in the time series plots of the order parameters, is observed. The detailed analysis shows that the special prelude dynamics is induced by the competition between two synchronized clusters, and the analytical expression for the corresponding order parameter is obtained.
- Published
- 2014
45. Antagonistic effect of early stage zinc on arsenic toxicity induced preterm birth during pregnancy: evidence from a rural Bangladesh birth cohort
- Author
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Yong-Yue Wei, Hui Huang, Yan-Kai Xia, Liang-Min Wei, Xin Chen, Ru-Yang Zhang, Wei-Wei Duan, Li Su, Mohammad L. Rahman, Mahmudur Rahman, Md. Golam Mostofa, Quazi Qamruzzaman, Wen-Hui Guo, Xian Sun, Hao Yu, Hong-Bing Shen, Zhi-Bin Hu, David C. Christiani, Feng Chen, and Yuan-Yuan Ji
- Subjects
Medicine - Published
- 2021
- Full Text
- View/download PDF
46. Expression Pattern Analysis of Zinc Finger Protein Genes in Wheat (Triticum aestivum L.) Under Phosphorus Deprivation
- Author
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Xiao-juan LI, Cheng-jin GUO, Wen-jing LU, Wei-wei DUAN, Miao ZHAO, Chun-ying MA, Jun-tao GU, and Kai XIAO
- Subjects
wheat (Triticum aestivum L.) ,zinc finger protein ,Pi deprivation ,gene expression ,Agriculture (General) ,S1-972 - Abstract
Zinc finger protein (ZFP) genes comprise a large and diverse gene family, and are involved in biotic and abiotic stress responses in plants. In this study, a total of 126 ZFP genes classified into various types in wheat were characterized and subjected to expression pattern analysis under inorganic phosphate (Pi) deprivation. The wheat ZFP genes and their corresponding GenBank numbers were obtained from the information of a 4×44K wheat gene expression microarray chip. They were confirmed by sequence similarity analysis and named based on their homologs in Brachypodium distachyon or Oriza sativa. Expression analysis based on the microarray chip revealed that these ZFP genes are categorized into 11 classes according to their gene expression patterns in a 24-h of Pi deprivation regime. Among them, ten genes were differentially up-regulated, ten genes differentially down-regulated, and two genes both differentially up- and down-regulated by Pi deprivation. The differentially up- or down-regulated genes exhibited significantly more or less transcripts at one, two, or all of the checking time points (1, 6, and 24 h) of Pi stress in comparison with those of normal growth, respectively. The both differentially up- and down-regulated genes exhibited contrasting expression patterns, of these, TaWRKY70;5 showed significantly up-regulated at 1 and 6 h and down-regulated at 24 h whereas TaAN1AN20-8;2 displayed significantly upregulated at 1 h and downregulated at 6 h under deprivation Pi condition. Real time PCR analysis confirmed the expression patterns of the differentially expressed genes obtained by the microarray chip. Our results indicate that numerous ZFP genes in wheat respond to Pi deprivation and have provided further insight into the molecular basis that plants respond to Pi deprivation mediated by the ZFP gene family.
- Published
- 2014
- Full Text
- View/download PDF
47. Seven Sections Research Method Based on Engineering.
- Author
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Fan Li, Wei Wei Du, Run Qi Li, and Zhi Sen Wang
- Published
- 2018
- Full Text
- View/download PDF
48. Partial and complete periodic synchronization in coupled discontinuous map lattices.
- Author
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Ke-Li Yang, Hui-Yun Chen, Wei-Wei Du, Tao Jin, and Shi-Xian Qu
- Subjects
SYNCHRONIZATION ,DISCONTINUOUS functions ,LATTICE theory ,MATHEMATICAL mappings ,PARAMETER estimation - Abstract
The partial and complete periodic synchronization in coupled discontinuous map lattices consisting of both discontinuous and non-invertible maps are discussed. We classify three typical types of periodic synchronization states, which give rise to different spatiotemporal patterns including static partial periodic synchronization, dynamically periodic synchronization, and complete periodic synchronization patterns. A special prelude dynamics of partial and complete periodic synchronization motion, which is shown by five separated concave curves in the time series plots of the order parameters, is observed. The detailed analysis shows that the special prelude dynamics is induced by the competition between two synchronized clusters, and the analytical expression for the corresponding order parameter is obtained. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
49. Application of 4Rs principle in animal experiments for the research of human functions
- Author
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CAI Wei-wei, DU Bin, CHEN Jun-liang, TANG Shai-di, QIU Li-ying
- Subjects
4rs principle ,animal ethics ,medical education ,Medicine - Abstract
Objective To evaluate 4Rs principle applied in animal experiments for research and to optimize training outcomes with animal model. Methods The 4Rs principle was applied in four parts of training process with animal models including “replacing animal experiments with human physiological experiments” “integrating experimental projects, reducing the use of animals” “optimizing experimental process for minimizing animal suffering” and “strengthening ethical concepts, responsibility in research with experimental animals”. After class, feedbacks from students were collected through questionnaire survey and the data was analyzed. Results There were 92.0% medical students showed sympathize for the laboratory animals in the process of animal experiments; took care of the welfare of experimental animals while achieving training objectives. Conclusions The 4Rs principle provides a new idea and method for animal experiment and cultivates learners' animal ethics.
- Published
- 2021
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