添加MgLiSi玻璃对BNT陶瓷介电性能的影响

采用传统固相反应法,制备了钨青铜结构BaO·Nd2O3·4TiO2(BNT)陶瓷,并添加质量分数为1%～6%的MgO·Li2O·SiO2(MgLiSi)玻璃。对其显微结构和介电性能进行了研究。结果表明:在BNT陶瓷中添加适量的MgLiSi玻璃,可以使BNT陶瓷的烧结温度从1250℃以上降低到1150℃,并提高其介电性能。当添加质量分数为4%的MgLiSi玻璃时,BNT陶瓷可获得最佳的介电性能:εr=95,tanδ=5×10–4,击穿场强为16.7×103V/mm。     

p-n结脉冲激光诱发电荷收集试验研究

测量了脉冲激光诱发半导体p-n结的瞬态脉冲电流,研究瞬态脉冲幅值和收集电荷与能量、偏压及入射位置的相关性。研究结果表明,瞬态脉冲信号幅值和收集到的总电荷随脉冲激光能量的增大而增多,与激光能量呈指数关系;收集电荷随偏压而增大;敏感区内的收集电荷数相差不大,远离敏感区的收集电荷明显减小。另外,将研究结果与重离子试验数据进行比对,两者有一定的相似性,但电荷收集脉冲幅值、脉冲波形有一定的差异。其结果为深入研究激光模拟单粒子效应技术奠定了基础。     

大雁二矿深部软岩巷道变形破坏机理研究及防治措施

软岩巷道变形破坏是影响煤矿安全生产的主要危害之一。通过调查研究,发现导致大雁二矿巷道变形破坏的主要因素是底鼓。对巷道底鼓原因进行了分析,提出了综合防治措施;实施后,取得了很好的效果。     

利用统一编码表实现IEC 60870-5-103 通信报文的便利统一传送

IEC 60870-5-103继电保护设备信息接口配套标准在电力系统中得到了广泛的应用,功能类型FUN和信息序号INF是103通信规约的一个重要应用,它存在诸如INF不能突破256个限制等问题.为了解决此类问题,提出了一种利用统一编码表实现103通信报文便利统一传送的方法,即在编码分配表中,把0000 H～FFFF H的编码区划分为若干个区,它们分别用于描述定值、控制字、装置类型、操作等,不再区分FUN和INF,由于每个编码区的空间都开得足够大,这就突破了信息序号INF不能超过256个的限制.该方法具有新颖、简捷、便于编程、易于伸缩和扩展的优点.     

Phagocytosis-Regulators-Based Signature to Predict the Prognosis and Chemotherapy Resistance for Breast Cancer Patients

Phagocytosis is crucial in tumor surveillance and immune function. The association between phagocytosis and the outcomes of breast cancer patients has not been well-determined. In this study, data were downloaded from the cancer genome atlas (TCGA) and gene expression omnibus (GEO) databases to investigate the role of phagocytosis in breast cancer. Data from the TCGA and GEO databases were used to investigate the prognostic role of phagocytosis in breast cancer. Then, we performed pathway enrichment analysis, copy number variation (CNV) and single-nucleotide variant (SNV) analyses, immune infiltration analysis, calculation of tumor purity, stromal score, and immune score, and consistent clustering. We also constructed a phagocytosis-regulators-based signature system to examine its association in survival and drug response. The genomic and expression differences in the phagocytosis regulators in breast cancer were systematically analyzed, explaining the widespread dysregulation of phagocytosis regulators. Using the investigated association of phagocytosis regulators with the prognosis and tumor immune environment, we constructed a prognostic model based on phagocytosis regulators. We discovered that patients with high risk scores had a poor prognosis and were negatively associated with immune functions. The model had preferential predictive performance and significantly consistent drug-resistance prediction results. Our findings suggest that the phagocytosis-factors-based scoring system can be used as a novel prognostic factor, serving as a powerful reference tool for predicting prognosis and developing methods against drug resistance.     

Mutual promotion effect of SO2 and NOx during yellow phosphorus and phosphate rock slurry adsorption process

Removing SO₂ and NOx released from middle and small-scaled coal-burning boiler is one important strategy for air pollution control. Herein, we first report a novel process on simultaneous eliminating SO₂ and NOx at low temperature, by employing large scale and cheap sources of phosphorus sludge and phosphate rock slurry. The results showed that 100% desulfurization and denitrification efficiency can be obtained, and there exhibited a significant mutual-promoting effect between SO₂ and NOx abatement processes. Based on characterizations and theoretical calculation results, it was found that the active substances produced by the interaction of sulfur and nitrogen species played a significant role in promoting the removal of SO₂ and NOx. Compared with traditional purification technology, this process can achieve simultaneous desulfurization and denitrification with no discharge of secondary pollutants, and can be regarded as a new and economic technology for efficient removal of SO₂ and NOx in industrial scale.     

Simulation of Coupling Process of Flexible Needle Insertion into Soft Tissue Based on ABAQUS

In order to get to the desired target inside the body, it is essential to investigate the needle-tissue coupling process and calculate the tissue deformation. A cantilever beam model is presented to predicting the deflection and bending angle of flexible needle by analyzing the distribution of the force on needle shaft during the procedure of needle insertion into soft tissue. Furthermore, a finite element (FE) coupling model is proposed to simulate the needle-tissue interactive process. The plane and spatial models are created to relate the needle and tissue nodes. Combined with the cantilever beam model and the finite element needle-tissue coupling model, the simulation of needle-tissue interaction was carried out by the ABAQUS software. The comparing experiments are designed to understand the needle-tissue interactions, by which the same points in the experiments and simulation are compared and analyzed. The results show that the displacements in x and z directions in the simulation can accord with the experiments, and the deformation inside the tissue mainly occurs in the axial direction. The study is beneficial to the robotassisted and virtual needle insertion procedure, and to help the physicians to predict the inside tissue deformation during the treatments.     

基于IEC 61850标准的通用IED仿真系统的设计与实现

分析了目前智能变电站自动化系统调试中的各种问题,提出了通过构建基于IEC 61850标准的通用智能电子设备(IED)仿真系统进行仿真测试的解决方案。叙述了该系统的体系架构、功能结构和实现通用IED仿真系统的关键技术;设计了多态多时序信号仿真、闭环控制仿真、通用面向对象变电站事件(GOOSE)仿真等关键模块的仿真流程。开发实现了通用IED仿真系统软件,并将其成功运用于多个智能变电站系统的集成调试。     

微波诱导催化氧化剩余污泥的研究

以活性炭为催化剂,对微波诱导氧化剩余污泥过程中污泥性质的变化进行了研究.结果表明,在微波辐照功率为800 W、微波辐照时间为60 s、SS的活性炭投加量为0.3 g·g~(-1)时,污泥溶解率达到28.9%,同单独微波处理污泥相比,污泥溶解率增大10%.在此操作条件下,更多的微生物胞外聚合物分解、胞内物质释放到液相中,使污泥上清液中溶解性有机物含量明显增加.污泥破解后,磷释放到溶液中,使TP的质量浓度增加了1.4倍.在微波辐照活性炭产生的高温及氧化剂作用下,部分有机氮被矿化,NH4_4~+-N的质量浓度由7.9增至14.2 mg·L~(-1).