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| 1 | Oxygen octahedron tilting,electrical properties and mechanical behaviors in alkali niobate-based lead-free piezoelectric ceramics显示文摘In this work,we present a new piezoelectric solid solution consisting of two typical alkali niobate-based materials,K_(0.5)Na_(0.5)NbO_(3)(KNN)and Li_(0.15)Na_(0.85)NbO_(3)(LNN).Although KNN and LNN have the same perovskite structure,they exhibit extremely different electrical properties and mechanical behaviors.The phase structures,electrical and mechanical evolutions of the new lead-free piezoelectric materials with different ratios of KNN and LNN are comprehensively and theoretically investigated.According to the Xray diffraction patterns and curves of permittivity versus temperature,a series of complicated phase transitions can be found with varied LNN content.Rietveld refinement results based on XRD patterns reveal an oxygen octahedron tilting in the LNN-rich crystal structure,and simultaneously the reasons for octahedron tilting are discussed.The distorted crystal structure is accompanied by extremely decreased electric properties but increased mechanical properties,which reveals electrical and mechanical properties of alkali niobate-based piezoelectric ceramics strongly depend on their inner structures,and the enhancement of intrinsic hardness results in the deterioration of piezoelectric properties.Our work exhibits the detailed evolutions of structure,electrical and mechanical properties from KNN to LNN,which provides experimental and theoretical basis for development of new alkali niobate-based piezoelectric materials. | Zhi Tan Shaoxiong Xie Laiming Jiang Jie Xing Yu Chen Jianguo Zhu Dingquan Xiao Qingyuan Wang | 2019 | Journal of Materiomics2019，5，3： | 3 |
| 2 | Current management of chemotherapy-induced neutropenia in adults:key points and new challenges显示文摘Chemotherapy-induced neutropenia(CIN)is a potentially fatal and common complication in myelosuppressive chemotherapy.The timing and grade of CIN may play prognostic and predictive roles in cancer therapy.CIN is associated with older age,poor functional and nutritional status,the presence of significant comorbidities,the type of cancer,previous chemotherapy cycles,the stage of the disease,specific chemotherapy regimens,and combined therapies.There are many key points and new challenges in the management of CIN in adults including:(1)Genetic risk factors to evaluate the patient’s risk for CIN remain unclear.However,these risk factors urgently need to be identified.(2)Febrile neutropenia(FN)remains one of the most common reasons for oncological emergency.No consensus nomogram for FN risk assessment has been established.(3)Different assessment tools[e.g.,Multinational Association for Supportive Care in Cancer(MASCC),the Clinical Index of Stable Febrile Neutropenia(CISNE)score model,and other tools]have been suggested to help stratify the risk of complications in patients with FN.However,current tools have limitations.The CISNE score model is useful to support decision-making,especially for patients with stable FN.(4)There are still some challenges,including the benefits of granulocyte colony stimulating factor treatment and the optimal antibiotic regimen in emergency management of FN.In view of the current reports,our group discusses the key points,new challenges,and management of CIN. | Committee of Neoplastic Supportive-Care(CONS),China Anti-Cancer Association Committee of Clinical Chemotherapy,China Anti-Cancer Association Yi Ba Yuankai Shi Wenqi Jiang Jifeng Feng Ying Cheng Li Xiao Qingyuan Zhang Wensheng Qiu Binghe Xu Ruihua Xu Bo Shen Zhiguo Luo Xiaodong Xie Jianhua Chang Mengzhao Wang Yufu Li Yuerong Shuang Zuoxing Niu Bo Liu Jun Zhang Li Zhang Herui Yao Conghua Xie Huiqiang Huang Wangjun Liao Gongyan Chen Xiaotian Zhang Hanxiang An Yanhong Deng Ping Gong Jianping Xiong Qinghua Yao Xin An Cheng Chen Yanxia Shi Jialei Wang Xiaohua Wang Zhiqiang Wang Puyuan Xing Sheng Yang Chenfei Zhou | 2020 | Cancer Biology & Medicine2020，17，4： | 2 |
| 3 | Early changes to the extracellular space in the hippocampus under simulated microgravity conditions显示文摘The smooth transportation of substances through the brain extracellular space(ECS)is crucial to maintaining brain function;however,the way this occurs under simulated microgravity remains unclear.In this study,tracer-based magnetic resonance imaging(MRI)and DECS-mapping techniques were used to image the drainage of brain interstitial fluid(ISF)from the ECS of the hippocampus in a tail-suspended hindlimb-unloading rat model at day 3(HU-3)and 7(HU-7).The results indicated that drainage of the ISF was accelerated in the HU-3 group but slowed markedly in the HU-7 group.The tortuosity of the ECS decreased in the HU-3 group but increased in the HU-7 group,while the volume fraction of the ECS increased in both groups.The diffusion rate within the ECS increased in the HU-3 group and decreased in the HU-7 group.The alterations to ISF drainage and diffusion in the ECS were recoverable in the HU-3 group,but neither parameter was restored in the HU-7 group.Our findings suggest that early changes to the hippocampal ECS and ISF drainage under simulated microgravity can be detected by tracer-based MRI,providing a new perspective for studying microgravity-induced nano-scale structure abnormities and developing neuroprotective approaches involving the brain ECS. | Yajuan Gao Hongbin Han Jichen Du Qingyuan He Yanxing Jia Junhao Yan Hui Dai Bin Cui Jing Yang Xunbin Wei Liu Yang Rui Wang Ren Long Qiushi Ren Xing Yang Jiabin Lu | 2022 | Science China(Life Sciences)2022，65，3： | 2 |
| 4 | β-delayed proton decay of89Ru显示文摘 | Zhankui Li Shuwei Xu Yong Yu Yuanxiang Xie Chunfang Wang Jianping Xing Qiangyan Pan Qingyuan Hu Shihong Li Hongyan Chen Tianmei Zhang | 2000 | Science in China Series A: Mathematics2000，，12： | 1 |
| 5 | Effects of Spiral Magnetic Field on Structures Transformation and Macrosegregation of Sn-Pb Alloy显示文摘The effect of spiral magnetic field (SMF) on the solidification process of Sn-20 wt.%Pb hypoeutectic alloy was studied in this work. The temperature distribution and the macrosegregation together with the eutectic lamellar spacing during solidification were measured under different magnetic fields. The results indicate that the compositions in the top and bottom portions of the sample are nearly the same and the segregation phenomenon is basically eliminated by SMF at an exciting current of 125 A. The morphology of the primary phase transforms from coarse dendrite to rosette or ellipsoidal equiaxed crystal and the spacing of the eutectic lamellar increases from 1.6 to 3.9 μm when the exciting current increases from 0 to 125 A. Moreover, if the exciting current is high enough, the forced fluid flow caused by SMF will enhance the process of transition from lamellar eutectic structure to anomalous rod-like one. | Xingguo ZHANG Qian ZHAO Jianshe GUO Qingyuan XING Liang DENG Xiaoguang HOU Canfeng FANG | 2013 | Acta Metallurgica Sinica(English Letters)2013，26，3： | 1 |
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