检索结果-南通市图书馆

Reduction of chromium oxides in stainless steel dust

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2015年第6期22卷 573-581页

作者： Yan-ling Zhang wen-ming guo Xin-lei Jia State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

The recovery of metal oxides from stainless steel dust using C（graphite）, SiFe, and Al as reductants was investigated under various conditions. The apparent distribution ratio of Cr（L Cr ′^m/s ） in the recovered metal and residual slag phases was defined as the major performance metric. The results show that the recovery ratio of metals increases as the ratio of CaO ：SiO2 by mass in the residual slag increases to 1.17. The residual content of metals in the slag decreases as the Al2O3 content of the slag is increased from approximately 8wt% to 10wt%. The recovery ratio of Cr increases with increasing L Cr ′^ m/s , and a linear relationship between L Cr ′^m/s and the activity coefficient ratio of CrO in the slag and the recovered metal phase is observed. The combination of C and SiFe or Al as the reducing agents reveals that Si is the more effective coreductant.

关键词： stainless steel dust chromium oxides recovery apparent distribution ratio activity coefficient

Synthesis, Crystal Structure and Biological Activity of 2-Chloro-N-{2-fluoro-5-[N-(phenylsulfonyl) phenyl-sulfonamido]phenyl}benzamide

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2008年第3期24卷 295-298页

作者： LI wen-ming WANG Jian-guo LI Zheng-ming SONG Hai-bin Elemento-Organic Chemistry Institute State Key Laboratory of Elemento-Organic Chemistry National Pesticide Engineering Research Center Nankai University Tianjin 300071 P R. China

2-Chloro-N-{2-fluoro-5-[N-（phenylsulfonyl）phenylsulfonamido]phenyl}benzamide was synthesized and its crystal structure was also determined by X-ray single-crystal diffraction. The title compound（C25H18ClFN2O5S2） belongs to monoclinic, space group P21/n with a=0.7377（3） nm, b=1.2036（5） nm, c=2.6846（11） nm, β=90.895（9）°, V=2.3833（16） nm3, Mr=544.98, Z=4, Dc=1.519 g/cm3, μ=0.385 mm–1, F（000）=1120, R1=0.0632, and wR2=0.1438. Its crystal structure belongs to a novel class that has not been reported yet, and its preliminary herbicidal activity was also tested. Its inhibition rate to seedling growth of barnyard grass reaches 15.1% at 100 μg/mL.

关键词： X-ray diffraction Crystal structure Synthesis Biological activity

Simulation study on fluid flow performance of injection stirring composite process in molten iron desulfurization process

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2023年第12期30卷 2403-2415页

作者： Chao Lv Xu-xin Chen Hai-wei Zhang Hong-liang Zhao Lin-hui Yu wen-ming guo School of Control Engineering Northeastern University at QinhuangdaoQinhuangdao066000HebeiChina Yingkou Dongbang Environmental Protection Technology Co. Ltd.Yingkou115000LiaoningChina School of Metallurgy and Ecological Engineering University of Science and Technology BeijingBeijing100083China XCMG Earthmoving Machinery Division Xuzhou221004JiangsuChina

The blowing and stirring composite process of molten iron desulfurization process affects the desulfurization efficiency and has obvious advantages in improving steel properties and expanding the scale of converter *** present,the injection position of the injection stirring research is fixed,and the desulfurization efficiency needs to be *** gas–liquid flow behavior of single-scale bubble model and the size and distribution of bubbles in multi-scale bubble model were studied by computational fluid dynamics numerical simulation method for the injection mixing composite process of jet inlet and stirring paddle rotating at the same *** pressure distribution and velocity distribution inside the fluid indicate that the velocity difference between the gas–liquid phases and the turbulence of the liquid are due to the collisions of bubbles,which are due to essential conditions for bubble *** injection air volumes have essential influence on the formation of single *** the injection volume reaches 2.8 m3/h,the turbulent kinetic energy is maximum,the bubble formation is rapid,and the desulfurization efficiency can be *** multi-bubble results show that the bubble diameter is mainly distributed in the range of 2–5 *** higher gas flow rate will increase the number of bubbles in the fluid and promote the bubble refinement process.

关键词： Molten iron desulfurization Spraying-Stirring-Bubble Numerical simulation

Spam filtering based on PLS Feature Extraction

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Spam filtering based on PLS Feature Extraction

第三届全国信息检索与内容安全学术会议

作者： Peng-ming Wang ming-wen Wang guo-Bing Huang (School of Computer Information Engineering,Jiangxi Normal University,NanChang,330022

Along with the coming of network times,the research of spam filtering technology has been imperative under the situation,However,some specialties of mail dataset such as the data sparseness,high dimensionalities and multi-collinearity in mail content make great difference between spare filtering work and text classification *** this paper,a new Partial Least Squares(PLS)feature extraction method on spam filtering is proposed,which could extract new much less latent semantic components than full features by linear combination,compress original data and be better solution for *** experiments on CEAS 2006 benchmark datasets(Enron-Spam datasets)show that promising results are reported after evaluated by TREC spam track and the new method performs better than feature selection by x statistics.

关键词： spare filtering PLS feature extraction

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

苯胺-邻甲苯胺共聚物的合成及其性能研究

化学世界 2011年第3期52卷 150-154页

作者：熊绍良温国明苏育志中南大学普教中心湖南长沙410083 广州大学化学化工学院广东广州510006

以苯胺、邻甲苯胺为单体,过硫酸铵为氧化剂,蒸馏水为溶剂,碘为掺杂剂制备了聚苯胺、聚邻甲苯胺以及它们的共聚物,通过FT-IR、UV-Vis、TG、XRD、SEM等测试手段对单聚物和共聚物进行了结构形态表征与性能分析。碘掺杂后的单聚物和共聚物... 详细信息

以苯胺、邻甲苯胺为单体,过硫酸铵为氧化剂,蒸馏水为溶剂,碘为掺杂剂制备了聚苯胺、聚邻甲苯胺以及它们的共聚物,通过FT-IR、UV-Vis、TG、XRD、SEM等测试手段对单聚物和共聚物进行了结构形态表征与性能分析。碘掺杂后的单聚物和共聚物的导电率有明显的改善,其中碘掺杂聚邻甲苯胺的导电率为1.14×10-3S/cm,碘掺杂苯胺-邻甲苯胺共聚物的导电率为8.57×10-3S/cm。

关键词：聚苯胺聚邻甲苯胺苯胺-邻甲苯胺共聚物碘掺杂导电聚合物

Deciphering fungal metabolon coupling tandem inverse-electrondemand Diels-Alder reaction and semipinacol rearrangement for the biosynthesis of spiro polycyclic alkaloids

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第01期 288-296页

作者： Shuai Liu wen-Qiang Xu Ying-Tong Di Man-Cheng Tang Ding-Kang Chen ming-ming Cao Yao-wen Chang Hong-Yu Tang Chun-Mao Yuan Jun-Bo Yang Zhi-Li Zuo Han guo Zi-Fei Xu Ying Zeng Yun-Dong Wu Xiao-Jiang Hao Key Laboratory of Phytochemistry and Natural Medicines (Chinese Academy of Sciences) Kunming Institute of Botany Chinese Academy of Sciences University of Chinese Academy of Sciences Lab of Computational Chemistry and Drug Design State Key Laboratory of Chemical Oncogenomics Peking University Shenzhen Graduate School Shenzhen Bay Laboratory State Key Laboratory of Microbial Metabolism School of Life Sciences & Biotechnology Shanghai Jiao Tong University State Key Laboratory of Functions and Applications of Medicinal Plants Guizhou Medical University Molecular Biology Experimental Center Germplasm Bank of Wild Species in Southwest China Kunming Institute of Botany Chinese Academy of Sciences Yunnan Key Laboratory for Wild Plant Resources Kunming Institute of Botany Chinese Academy of Sciences Research Unit of Chemical Biology of Natural Anti-Virus Products Chinese Academy of Medical Sciences

In the intricate process of natural product biosynthesis, a metabolon can enhance metabolic flux by associating sequential enzymes. A fungal metabolon, comprising of flavin-dependent monooxygenase Spe F and P450 monooxygenase Spe G, is identified in the biosynthesis of spiro polycyclic alkaloids(+)-notoamide B and its diastereomer(+)-versicolamide B. Using notoamide E as a substance, Spe F/Spe G metabolon can control the stereoselectivity of its 2,3-epoxidation, followed by hydrogen atom ion at C-17 to generate reactive epoxide tau-m A with dienyl iminium unit. Subsequently,(+)-notoamide B and(+)-versicolamide B are produced via tandem nonenzymatic inverse-electron-demand Diels-Alder reaction and semipinacol rearrangement. This provides the first example of metabolon in the biosynthesis of spiro-prenylated indole alkaloids.

关键词：

同方期刊数据库

The detection, extraction and parameter estimation of extreme-mass-ratio inspirals with deep learning

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 86-96页

作者： Qianyun Yun wen-Biao Han Yi-Yang guo He Wang minghui Du Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Shanghai Astronomical Observatory Chinese Academy of Sciences School of Physics and Astronomy Shanghai Jiao Tong University School of Astronomy and Space Science University of Chinese Academy of Sciences Taiji Laboratory for Gravitational Wave Universe (Beijing/Hangzhou) University of Chinese Academy of Sciences Lanzhou Center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu Province Key Laboratory of Quantum Theory and Applications of MoE Lanzhou University Institute of Theoretical Physics & Research Center of Gravitation Lanzhou University International Centre for Theoretical Physics Asia-Pacific (ICTP-AP) University of Chinese Academy of Sciences (UCAS) Center for Gravitational Wave Experiment National Microgravity Laboratory Institute of Mechanics Chinese Academy of Sciences

One of the primary goals of space-borne gravitational wave detectors is to detect and analyze extreme-mass-ratio inspirals(EMRIs). This task is particularly challenging because EMRI signals are complex, lengthy, and faint. In this work, we introduce a2-layer convolutional neural network(CNN) approach to detect EMRI signals for space-borne detectors, achieving a true positive rate(TPR) of 96.9% at a 1% false positive rate(FPR) for signal-to-noise ratio(SNR) from 50 to 100. Especially, the key intrinsic parameters of EMRIs such as the mass, spin of the supermassive black hole(SMBH) and the initial eccentricity of the orbit can also be inferred directly by employing a neural network. The mass and spin of the SMBH can be determined at 99% and 92% respectively. This will greatly reduce the parameter spaces and computing cost for the following Bayesian parameter *** model also has a low dependency on the accuracy of the waveform model. This study underscores the potential of deep learning methods in EMRI data analysis, enabling the rapid detection of EMRI signals and efficient parameter estimation.

关键词： gravitational wave EMRIs deep-learing

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

黄河与长江两经济带形成的分形比较研究

中国软科学 2008年第12期 77-85页

作者：王晓巍温国明李二玲哈尔滨工业大学管理学院黑龙江哈尔滨150001 西安理工大学管理学院陕西西安710048 河南大学环境与规划学院河南开封475004

进入新世纪,中国区域经济发展的基本格局是将加快北移西进,建设黄河经济带是中国国民经济建设重点北移西进的必然趋势。本文认为,经济带的形成是一个复杂的过程,具有标度不变性或自相似性,即经济带的形成具有分形特征,工商业企业是经济... 详细信息

进入新世纪,中国区域经济发展的基本格局是将加快北移西进,建设黄河经济带是中国国民经济建设重点北移西进的必然趋势。本文认为,经济带的形成是一个复杂的过程,具有标度不变性或自相似性,即经济带的形成具有分形特征,工商业企业是经济带形成的分形元。从Zipf维数来看,长江经济带比黄河经济带发育较为成熟,因此本文以长江经济带为例,运用形状类似于四角星型的DLA分形模型,从动态的角度来认识这一非平衡过程,从另外一个角度分析了长江、黄河经济带的形成机理。

关键词：江河经济带分形理论分维比较形成机理

Cortico-striatal gamma oscillations are modulated by dopamine D3 receptors in dyskinetic rats

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第4期20卷 1164-1177页

作者： Pengfei Wang Yuewei Bi Min Li Jiazhi Chen Zhuyong Wang Huantao wen ming Zhou Minjie Luo Wangming Zhang Neurosurgery Center Department of Pediatric NeurosurgeryGuangdong Provincial Key Laboratory on Brain Function Repair and RegenerationZhujiang HospitalSouthern Medical UniversityGuangzhouGuangdong ProvinceChina

Long-term levodopa administration can lead to the development of levodopa-induced *** oscillations are a widely recognized hallmark of abnormal neural electrical activity in levodopa-induced ***,studies have reported increased oscillation power in cases of levodopa-induced ***,little is known about how the other electrophysiological parameters of gamma oscillations are altered in levodopa-induced ***,the role of the dopamine D3 receptor,which is implicated in levodopa-induced dyskinesia,in movement disorder-related changes in neural oscillations is *** found that the cortico-striatal functional connectivity of beta oscillations was enhanced in a model of Parkinson’s ***,levodopa application enhanced cortical gamma oscillations in cortico-striatal projections and cortical gamma aperiodic components,as well as bidirectional primary motor cortex(M1)↔dorsolateral striatum gamma *** of PD128907(a selective dopamine D3 receptor agonist)induced dyskinesia and excessive gamma oscillations with a bidirectional M1↔dorsolateral striatum ***,administration of PG01037(a selective dopamine D3 receptor antagonist)attenuated dyskinesia,suppressed gamma oscillations and cortical gamma aperiodic components,and decreased gamma causality in the M1→dorsolateral striatum *** findings suggest that the dopamine D3 receptor plays a role in dyskinesia-related oscillatory activity,and that it has potential as a therapeutic target for levodopa-induced dyskinesia.

关键词： aperiodic components dopamine D3 receptor dorsolateral striatum functional connectivity gamma oscillations levodopa-induced-dyskinesia local field potentials neuromodulation Parkinson’s disease primary motor cortex