检索结果-南通市图书馆

Depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite

引用

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 335-345页

作者： feng zhang Chenyang zhang Linlin Wu Wei Sun Hongliang zhang Jianhua Chen Yong Pei Songjiang Li Engineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and Utilization Hunan International Joint Research Center for Efficient and Clean Utilization of Critical Metal Mineral ResourcesSchool of Minerals Processing and BioengineeringCentral South UniversityChangsha 410083China State Key Laboratory of Mineral Processing Beijing General Research Institute of Mining&MetallurgyBeijing 100160China Hunan Provincial Key Laboratory of Micro&Nano Materials Interfaces Science College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China Department of Chemistry Xiangtan UniversityXiangtan 411105China China Railway Resource Group Co.Ltd Beijing 102300China

The depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite still lacked in-depth ***,the depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite was further systematically investigated with experiments and density functional theory(DFT)*** X-ray photoelectric spectroscopy(XPS)results,DFT calculation results,and frontier molecular orbital analysis indicated that sulfite ions were difficult to be adsorbed on sphalerite surface,suggesting that sulfite ions achieved depression effects on sphalerite through other non-adsorption ***,the oxygen content in the surface of sphalerite treated with sulfite ions in creased,which enhanced the hydrophilicity of the sphalerite and further increased the difference in hydrophilicity between sphalerite and ***,sulfite ions were chelated with lead ions to form PbSO_(3)in *** hydrophilic PbSO_(3)was more easily adsorbed on sphalerite than *** interaction between sulfite ions and lead ions could effectively inhibit the activation of *** addition the UV spectrum showed that after adding sulfite ions,the peak of perxanthate in the sphalerite treated xanthate solution was significantly stronger than that in the galena with xanthate solution,indicating that xanthate interacted more readily with sulfite ions and oxygen mo lecules within the sphalerite system,leading to the formation of ***,sulfite ions hardly depressed the flotation of ga lena and could promote the flotation of galena to some *** study deepened the understanding of the depression mechanism o sulfite ions on sphalerite and Pb^(2+)activated sphalerite.

关键词： sphalerite galena sulfite ion density functional theory depression mechanism

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于Boosting的代价敏感软件缺陷预测方法

引用

计算机科学 2017年第8期44卷 176-180,206页

作者：杨杰燕雪峰张德平南京航空航天大学计算机科学与技术学院南京211106

Boosting重抽样是常用的扩充小样本数据集的方法,首先针对抽样过程中存在的维数灾难现象,提出随机属性子集选择方法以进行降维处理;进而针对软件缺陷预测对于漏报与误报的惩罚因子不同的特点,在属性选择过程中添加代价敏感算法。以多个... 详细信息

Boosting重抽样是常用的扩充小样本数据集的方法,首先针对抽样过程中存在的维数灾难现象,提出随机属性子集选择方法以进行降维处理;进而针对软件缺陷预测对于漏报与误报的惩罚因子不同的特点,在属性选择过程中添加代价敏感算法。以多个基本k-NN预测器为弱学习器,以代价最小为属性删除原则,得到当前抽样集的k值与属性子集的预测器集合,采用代价敏感的权重更新机制对抽样过程中的不同数据实例赋予相应权值,由所有预测器集合构成自适应的集成k-NN强学习器并建立软件缺陷预测模型。基于NASA数据集的实验结果表明,在小样本情况下,基于Boosting的代价敏感软件缺陷预测方法预测的漏报率有较大程度降低,误报率有一定程度增加,整体性能优于原来的Boosting集成预测方法。

关键词：软件缺陷预测 Boosting 代价敏感随机属性选择集成k-NN

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Copper homeostasis and neurodegenerative diseases

引用

Neural Regeneration Research 2025年第11期20卷 3124-3143页

作者： Yuanyuan Wang Daidi Li Kaifei Xu Guoqing Wang feng zhang International Research Laboratory of Ethnomedicine of Ministry of Education Key Laboratory of Basic Pharmacology of Ministry of EducationLaboratory Animal Center and Key Laboratory of Basic Pharmacology of Guizhou ProvinceZunyi Medical UniversityZunyiGuizhou ProvinceChina

Copper,one of the most prolific transition metals in the body,is required for normal brain physiological activity and allows various functions to work normally through its range of *** homeostasis is meticulously maintained through a complex network of copper-dependent proteins,including copper transporters(CTR1 and CTR2),the two copper ion transporters the Cu-transporting ATPase 1(ATP7A)and Cu-transporting beta(ATP7B),and the three copper chaperones ATOX1,CCS,and *** in copper homeostasis can lead to either the deficiency or accumulation of copper in brain *** evidence suggests that abnormal copper metabolism or copper binding to various proteins,including ceruloplasmin and metallothionein,is involved in the pathogenesis of neurodegenerative ***,the exact mechanisms underlying these processes are not *** is a potent oxidant that increases reactive oxygen species production and promotes oxidative *** reactive oxygen species levels may further compromise mitochondrial integrity and cause mitochondrial *** oxygen species serve as key signaling molecules in copper-induced neuroinflammation,with elevated levels activating several critical inflammatory ***,copper can bind aberrantly to several neuronal proteins,including alphasynuclein,tau,superoxide dismutase 1,and huntingtin,thereby inducing neurotoxicity and ultimately cell *** study focuses on the latest literature evaluating the role of copper in neurodegenerative diseases,with a particular focus on copper-containing metalloenzymes and copper-binding proteins in the regulation of copper homeostasis and their involvement in neurodegenerative disease *** synthesizing the current findings on the functions of copper in oxidative stress,neuroinflammation,mitochondrial dysfunction,and protein misfolding,we aim to elucidate the mechanisms by which copper contributes to a wide range of heredit

关键词： Alzheimer's disease amyotrophic lateral sclerosis disease copper homeostasis copper toxicity Huntington's disease Menkes'disease multiple sclerosis neurodegenerative disease Parkinson's disease Wilson's disease

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

尼达尼布抗肿瘤研究进展

引用

药物生物技术 2017年第4期24卷 341-348页

作者：何洮凤许颖冯文骁金雪锋张永亮江苏大学药学院江苏镇江212013 江苏奥赛康药业股份有限公司江苏南京211100

尼达尼布是用于特发性肺纤维化治疗的小分子化学药物,作为一种可抑制血管生成和组织纤维化的多靶点受体酪氨酸激酶抑制剂,近年大量研究表明尼达尼布具有较好的抗肿瘤作用,其与抗肿瘤药物联用可提高抗肿瘤疗效。文章通过查阅文献及临床... 详细信息

尼达尼布是用于特发性肺纤维化治疗的小分子化学药物,作为一种可抑制血管生成和组织纤维化的多靶点受体酪氨酸激酶抑制剂,近年大量研究表明尼达尼布具有较好的抗肿瘤作用,其与抗肿瘤药物联用可提高抗肿瘤疗效。文章通过查阅文献及临床研究报告,对尼达尼布的临床前抑瘤作用及在多种肿瘤治疗中的临床试验研究进行了综述,为尼达尼布进一步的抗肿瘤研究开发提供参考。

关键词：尼达尼布抗肿瘤作用受体酪氨酸激酶抑制剂

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于BIM的杭黄高铁建德东站现浇梁支架方案研究

引用

铁道标准设计 2017年第1期61卷 45-50页

作者：曾绍武王学峰张学钢孙卫锋赵永锋向艳华陕西铁路工程职业技术学院陕西渭南714099 中铁三局第三工程有限公司太原030100

针对杭黄高铁建德东站站场地形地貌复杂,桥墩高度变化大,18种现浇非标准箱梁型式各异,支架搭设、拆除、周转施工组织难度大,提出采用Revit建立支架贝雷梁BIM模型进行三维审查细化支架布置方案,三维技术交底,工程材料数量提取,虚拟推演... 详细信息

针对杭黄高铁建德东站站场地形地貌复杂,桥墩高度变化大,18种现浇非标准箱梁型式各异,支架搭设、拆除、周转施工组织难度大,提出采用Revit建立支架贝雷梁BIM模型进行三维审查细化支架布置方案,三维技术交底,工程材料数量提取,虚拟推演施工过程,4D施工进度动态控制,材料周转方案优化,采用***进行力学分析计算,优化支架设计方案,确保支架布置形式合理,支架结构安全稳定,为实现支架施工过程的安全控制、质量控制、进度控制、成本控制提供了一种基于BIM技术的解决方案。

关键词：铁路桥梁施工 BIM 现浇梁支架方案优化高速铁路

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

智能天线内置一体化合路校准网络

引用

移动通信 2014年第2期38卷 76-79页

作者：张晓薛锋章华南理工大学电子与信息学院广东广州510640

为解决传统合路器体积重量与损耗不能兼顾的问题,提出了一种用于智能天线的内置一体化合路校准网络,采用微带结构,由带阻合路器和校准网络组成。实测结果表明,合路校准网络的通带插损小于0.7dB、通带回波损耗小于-15dB、阻带抑制大于30d... 详细信息

为解决传统合路器体积重量与损耗不能兼顾的问题,提出了一种用于智能天线的内置一体化合路校准网络,采用微带结构,由带阻合路器和校准网络组成。实测结果表明,合路校准网络的通带插损小于0.7dB、通带回波损耗小于-15dB、阻带抑制大于30dB。该一体化合路校准网络具有集成度高、体积小、重量轻、工艺简单等特点,有利于减小智能天线的体积及重量。

关键词：智能天线合路器校准网络最佳带阻滤波器

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Staged dendrite suppression for high safe and stable lithium-sulfur batteries

引用

Journal of Energy Chemistry 2025年第1期100卷 674-683页

作者： Jun Jiang Zhenjie Lu Yanwen Ding Shujun Liu Zhijie Qi Tian Tang Yunfan zhang Zhiyuan Ma Jingwen Sun Liang xue Wenyao zhang Pan Xiong Xin Wang Junwu Zhu Yongsheng Fu Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education Nanjing University of Science and Technology Jiangsu Pylon Battery Co.Ltd

The unavoidable dendrite growth and shuttle effect have long been stranglehold challenges limiting the safety and practicality of lithium-sulfur ***,we propose a dual-action strategy to address the lithium dendrite issue in stages by constructing a multifunctional surface-negatively-charged nanodiamond layer with high ductility and robust puncture resistance on polypropylene （PP） *** uniformly loaded compact negative layer can not only significantly enhance electron transmission efficiency and promote uniform lithium deposition,but also reduce the formation of dendrite during early deposition *** importantly,under the strong puncture stress encountered during the deterioration of lithium dendrite growth under limiting current,the high ductility and robust puncture resistance（145.88 MPa） of as-obtained nanodiamond layer can effectively prevent short circuits caused by unavoidable lithium *** Li||Li symmetrical cells assembled with nanodiamond layer modified PP demonstrated a stable cycle of over 1000 h at 2 mA cm-2with a polarization voltage of only 29.3 ***,the negative charged layer serves as a physical barrier blocking lithium polysulfide ions,effectively mitigating capacity *** improved cells achieved a capacity decay of only 0.042%per cycle after 700 cycles at 3 C,demonstrating effective suppression of dendrite growth and capacity attenuation,showing promising prospect.

关键词： Lithium-sulfur batteries Staged dendrite suppression Shuttle effect Surface-negatively-charged nanodiamond

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Müller cells are activated in response to retinal outer nuclear layer degeneration in rats subjected to simulated weightlessness conditions

引用

Neural Regeneration Research 2025年第7期20卷 2116-2128页

作者： Yuxue Mu Ning zhang Dongyu Wei Guoqing Yang Lilingxuan Yao Xinyue Xu Yang Li Junhui xue Zuoming zhang Tao Chen Aerospace Clinical Medical Center School of Aerospace MedicineAir Force Medical UniversityXi’anShaanxi ProvinceChina Department of Aviation Medicine Xijing HospitalAir Force Medical UniversityXi’anShaanxi ProvinceChina Department of Emergency Medicine Wuhan No.1 HospitalWuhanHubei ProvinceChina Third Regiment School of Basic MedicineAir Force Medical UniversityXi’anShaanxi ProvinceChina Fourth Regiment School of Basic MedicineAir Force Medical UniversityXi’anShaanxi ProvinceChina

A microgravity environment has been shown to cause ocular damage and affect visual acuity,but the underlying mechanisms remain ***,we established an animal model of weightlessness via tail suspension to examine the pathological changes and molecular mechanisms of retinal damage under *** 4 weeks of tail suspension,there were no notable alterations in retinal function and morphology,while after 8 weeks of tail suspension,significant reductions in retinal function were observed,and the outer nuclear layer was thinner,with abundant apoptotic *** investigate the mechanism underlying the degenerative changes that occurred in the outer nuclear layer of the retina,proteomics was used to analyze differentially expressed proteins in rat retinas after 8 weeks of tail *** results showed that the expression levels of fibroblast growth factor 2(also known as basic fibroblast growth factor)and glial fibrillary acidic protein,which are closely related to Müller cell activation,were significantly *** addition,Müller cell regeneration and Müller cell gliosis were observed after 4 and 8 weeks,respectively,of simulated *** findings indicate that Müller cells play an important regulatory role in retinal outer nuclear layer degeneration during weightlessness.

关键词： glial fibrous acidic protein gliosis Müller cells nerve growth factor neural differentiation neurodegeneration proteomic retinal degeneration retinal outer nuclear layer simulated weightlessness

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

矿石黏土类物质、铁锆化合物对磷吸附影响因素研究进展

引用

长江科学院院报 2017年第3期34卷 14-19,24页

作者：封雪张政王乾城侯贵保太原理工大学环境科学与工程学院太原030000 河北省高速公路荣乌管理处河北保定072550 哈尔滨工程大学建筑工程学院哈尔滨150001

介绍了水中含磷的危害及通过比较选择吸附法作为一种高效、低能耗的除磷方法,吸附剂及其特点和金属类氧化物、黏土矿石类、活性炭吸附材料的吸附原理。详细阐述了反应温度、反应时间、反应pH值、共存离子对矿石黏土类物质和铁锆化合物... 详细信息

介绍了水中含磷的危害及通过比较选择吸附法作为一种高效、低能耗的除磷方法,吸附剂及其特点和金属类氧化物、黏土矿石类、活性炭吸附材料的吸附原理。详细阐述了反应温度、反应时间、反应pH值、共存离子对矿石黏土类物质和铁锆化合物吸磷过程的影响:反应温度主要通过影响分子热运动从而影响到吸附材料吸磷效果;对任何吸附材料吸磷都需要一定的反应时间来达到最佳效果;反应pH值主要通过影响溶液中离子浓度、种类及吸附材料表面所含的离子与其反应从而影响到吸附材料吸磷效果;共存离子的存在可能会提高库仑力和磷酸盐活性部位竞争力。同时也阐述了吸附剂用量、磷的初始浓度、电解质、吸附材料粒径对吸磷效果的影响。今后对吸附磷材料的研究应重点关注改性材料及复合材料。

关键词：矿石黏土类物质铁的氧化物铁锆化合物吸附磷酸盐

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Pre- and post-synaptic beta-adrenergic activation enhances excitatory synaptic transmission in layer Ⅴ/Ⅵ pyramidal neurons of the medial prefrontal cortex of rats

Pre- and post-synaptic beta-adrenergic activation enhances e...

引用

中国神经科学学会第四次会员代表大会暨第七届全国学术会议

作者： Xiao-Hua JI~*,Xiao-Hua CAO~*,Chun-Lei zhang,Ze-Jun feng,xue-Han zhang,Lan MA,Bao-Ming LI Institute of Neurobiology,Institutes of Brain Science,Fudan University,Shanghai 200032,China

Abstractive:The present study investigated the modulation by beta-adrenoceptors(beta-AR’s) of excitatory synaptic transmission in layerⅤ/Ⅵpyramidal neurons of the rat medial prefrontal cortex(mPFC),using whole-cell patch clamp ***(ISO),a selective beta-AR agonist,induced a significant increase in the frequency of spontaneous excitatory post-synaptic currents(sEPSC’s) and miniature excitatory post-synaptic currents(mEPSC’s),which could be blocked by the beta-AR antagonist *** ISO facilitation of the frequency of mEPSC’s no longer appeared when the voltage-gated Ca channel blocker cadmium was *** significantly enhanced the evoked excitatory post-synaptic currents(eEPSC’s) mediated by non-NMDA receptors and NMDA *** also enhanced the currents induced by pressure- or bath-applied *** ISO facilitation of NMDA-R mediated eEPSC and NMDAinduced current was partly or completely blocked in the presence of Rp-cAMPS,a protein kinase A(PKA) *** induced a marked decrease in the paired-pulse facilitation of the non-NMDA-R and NMDA-R mediated eEPSC’*** present study provides the first electrophysiological demonstration that activation of beta-AR’s facilitates excitatory synaptic transmission in the mPFC through both pre- and post-synaptic mechanisms.

关键词： isoproterenol beta-Adrenoceptors EPSC medial prefrontal cortex rat

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：