检索结果-南通市图书馆

Synthesis ofp-Hydroxybenzaldehyde by Liquid-phase Catalytic Oxidation of p-Cresol over PVDF Modified Cobalt Pyrophosphate

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2013年第2期29卷 319-323页

作者： ZHANG Yi-bo WANG De-qiang MIAO zhen-zhen PAN Xi-qiang ZHANG zhen-dong YANG Xiang-guang Laboratory of Green Chemistry and Process Changchun Institute of Applied Chemistry Changehun 130022 P. R. China University of Chinese Academy of Sciences Beij'ing 100049 P. R. China

The influence of the wettability of a catalyst on the performance of the liquid phase oxidation of p-cresol was investigated. It was found that the surface hydrophobicity of a catalyst, which can be changed by modification with various loadings of polyvinylidene fluoride（PVDF）, has a promotion effect on the catalytic performance. At the same time, the reaction parameters such as oxygen pressure, molar ratio of NaOH to p-cresol, reaction temperature and time on the catalytic performance in the liquid-phase oxidation of p-cresol were optimized. As a result, 10%（mass fraction） PVDF modified cobalt pyrophosphate gave the highest conversion of 94.2% of p-cresol with a selectivity of 94.4% for p-hydroxybenzaldehyde at 348 K and a molar ratio of4：l of NaOH/p-cresol and an oxygen pressure of 1.0 MPa for 3 h.

关键词： Hydrophobicity p-Cresol p-Hydroxybenzaldehyde Oxidation Polyvinylidene fluoride(PVDF)

Corrosion behavior of additive-manufactured NiFeCrMo alloys in various corrosion media

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2023年第8期30卷 1574-1585页

作者： Dong-peng Wang Shuai Wang zhen Chen Xing-cheng Xie zhen-zhen Dong Hong-zhou Dong Yi-cheng Wu zhen-guang Liu Wei-li Li Yu-xin Wang School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina GRIMAT Engineering Institute Co. Ltd.Beijing 101407China GRINM(guangdong)Institute for New Advanced Materials and Technology Dongguan 528041GuangdongChina School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina

To understand the corrosion performance of additive-manufactured Ni-based in various corrosion media during the actual engineering application environment,the corrosion properties of NiFeCrMo alloys were investigated in 3.5 wt.%NaCl solution,1 mol/L H2SO_(4) solution,and 1 mol/L KOH solution,using potentiodynamic polarization and electrochemical impedance *** electrochemical measurement results revealed that the additive-manufactured NiFeCrMo alloys have higher corrosion resistance in all three solutions,compared with the as-cast *** results of the scanning electron microscope confirmed that the degree of additive-manufactured NiFeCrMo alloys after potentiostatic polarization in all three solutions is less serious.X-ray photoelectron spectroscopy analysis revealed that the enhancement of the corrosion resistance for the additive-manufactured NiFeCrMo alloys is attributed to the modification of the composition of the passive *** manufactured processing promotes the enrichment of the element of Cr or Mo in the passive film and it suppresses the formation of the oxidation of the element of Fe,leading to higher stability of the passive *** reason for the higher corrosion resistance of the additive-manufactured NiFeCrMo alloys was related to the enrichment of the element of Cr,as well as the lower content of the elements of Ni and Fe near the grain boundaries,which are beneficial to forming a more compact passive *** combined results are essential for the applications of high-strength Ni-based as structural materials in a corrosion environment.

关键词： Ni-based alloy Additive manufacturing Corrosion Passive film Corrosion media

Congenital muscular dystrophy caused by beta1,3-Nacetylgalactosaminyltransferase 2 gene mutation:Two case reports

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2022年第3期10卷 1056-1066页

作者： Wen-Juan Wu Su-zhen Sun Bao-guang Li Department of Neurology Hebei Children's HospitalHebei Children's Hospital Affiliated to Hebei Medical UniversityShijiazhuang 050031Hebei ProvinceChina

BACKGROUND Mutations in the beta1,3-N-acetylgalactosaminyltransferase 2(B3GALNT2)gene can lead to impaired glycosylation ofα-dystroglycan,which,in turn,causes congenital muscular dystrophy(CMD).The clinical phenotypes of CMD are broad,and there are only a few reports of CMD *** SUMMARY This report describes the cases of two children with CMD caused by B3GALNT2 gene *** main manifestations of the two cases were abnormal walking posture,language development delay,and abnormal development of the white *** 2 also had unreported symptoms of meningocele and giant arachnoid *** cases had compound heterozygous mutations of the B3GALNT2 gene,each containing a truncated mutation and a missense mutation,and three of the four loci had not been *** patients with CMD caused by B3GALNT2 gene mutation were found in the *** and analysis of the characteristics of CMD caused by B3GALNT2 gene mutation showed that 100%of the cases had nervous system *** magnetic resonance imaging often showed abnormal manifestations,and more than half of the children had eye and muscle involvement;some of the gene-related symptoms were *** B3GALNT2 gene can be used as one of the candidate genes for screening CMD,cognitive development retardation,epilepsy,and multiple brain developmental malformations in infants.

关键词： Beta1,3-N-acetylgalactosaminyltransferase 2 gene Congenital muscular dystrophy Epilepsy Language development retardation Autism Case report

Quark mass scaling and properties of light-quark matter

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2016年第6期27卷 43-48页

作者： zhen-Yan Lu guang-Xiong Peng Shi-Peng Zhang Marco Ruggieri Vincenzo Greco School of Physical Sciences University of Chinese Academyof SciencesBeijing 100049China Theoretical Physics Center for Science Facilities Institute of High Energy PhysicsBeijing 100049China Synergefic Innovation Center for Quantum Effects and Application Hunan Normal UniversityChangsha 410081China Department of Physics and Astronomy University of CataniaVia S.Sofia 6495125 CataniaItaly Laboratori Nazionali del Sud INFN-LNSVia S.Sofia 6295123 CataniaItaly

We study the properties of two-flavor quark matter in the equivparticle model.A new quark mass scaling at finite temperature is proposed and applied to the thermodynamics of two-flavor quark *** is found that the perturbative interaction has strong effect on quark matter properties at finite temperature and high *** pressure at the minimum free energy per baryon is exactly *** increasing temperature,the energy per baryon increases,while the free energy per baryon decreases.

关键词：物质性质夸克质量轻夸克标度最小自由能有限温度夸克物质相互作用

Removal of organic matter and nitrogen from distillery wastewater by a combination of methane fermentation and denitrification/nitrification processes

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2006年第4期18卷 654-659页

作者： LI Jun ZHANG zhen-jia LI Zhi-rong HUANG guang-yu Naoki Abe School of Environmental Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China School of Municipal and Environmental Engineering Shenyang Jianzhu University Shenyang 110168 China guangdongJiujiang Distillery Co. Ltd. Nanhai 528205 China Matsudo Research Laboratory Hitachi Plant Technologies. Ltd. Tokyo Japan

The distillery wastewater of guangdong Jiujiang Distillery, which is characteristic of containing high organic matters and rich total nitrogen, was treated by a combination of methane fermentation and denitrification/nitrification processes. 80% of COD in the raw wastewater was removed by methane fermentation at the COD volumetric loading rate of 20 kg COD/（m^3·d） using the expanded granule sludge bed （EGSB） process. However, almost all the organic nitrogen in the raw wastewater was converted into ammonia by ammonification there. Ammonia and volatile fatty acids （VFA） remaining in the anaerobically treated wastewater were simultaneously removed utilizing VFA as an electron donor by denitrification occurring in the other EGSB reactor and nitrification using PEG-immobilized nitrifying bacteria with recirculation process. An aerobic biological contact oxidization reactor was designed between denitrification/nitrification reactor for further COD removal. With the above treatment system, 18000-28000 mg/L of COD in raw wastewater was reduced to less than 100 mg/L. Also, ammonia in the effluent of the system was not detected and the system had a high removal rate for 900-1200 mg/L of TN in the raw wastewater, only leaving 400 mg/L of nitrate nitrogen.

关键词： ammonia COD VFA methane fermentation denitrification nitrification distillery wastewater immobilized nitrifyingbacteria

Implementation strategies for high accuracy grinding of hydrodynamic seal ring with wavy face for reactor coolant pumps

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2013年第10期56卷 2403-2412页

作者： FENG guang GUO DongMing HUO FengWei JIN ZhuJi kang RenKe Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education Dalian University of Technology

Large size mechanical seals are one of the most important components used in reactor coolant ***,the hydrodynamic seal rings with wavy face are difficult to machine due to their high hardness and high form accuracy *** order to solve this difficult problem,a novel four-axis linkage grinding method using a cup wheel to process the hydrodynamic seal rings by line contact was proposed.A preliminary study indicates that the form error of the ground seal ring surface is extremely sensitive to different linkage relations of the four *** taking the center height of the cup wheel and the laws of motion along the X-axis,Z-axis,B-axis and C-axis as control variables,their effects on the principle form error of the ground surface are *** implementation strategies are proposed to reach lower principle form *** is found that the minimal principle form error is only 9.64 nm and hence its influence on the ground seal ring shape can be neglected in designing an ultra-precision grinding *** addition,the results indicate that the position accuracy of the X-axis at the microscale is acceptable no matter which implementation strategy is *** study is expected to serve as a theoretical basis for design and development of the four-axis ultra-precision grinding machine.

关键词： reactor coolant pump hydrodynamic seal ring wavy face grinding cup wheel high accuracy

Performance measurement of broadband, wide-angle polarizing beam splitter

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第2期8卷 176-179页

作者： CHEN Wei-bin zhenG zhen-rong GU Pei-fu ZHANG Yue-guang State Key Laboratory of Modern Optical Instrumentation Zhejiang University Hangzhou 310027 China

Polarizing beam splitter (PBS) is a critical optical component in projection display system because PBS performance greatly influences the contrast and brightness of the system. PBS performance is usually measured by spectrophotometer after coating and cementing, but the measured result cannot represent the actual performance in practice because people usually change the incident angle in one plane (horizontal plane) and do not consider the other plane (vertical plane). Geometrical polarization rotation occurring at reduced F-number influences the measuring precision of s-polarization transmittance (Ts) and p-polarization reflectance (Rp). A more accurate and practical way to measure the performance of broadband, wide-angle PBS is presented in this paper.

关键词： Polarizing beam splitter (PBS) Projection display Measurement Contrast

Structural and Expressional Variations of the Mitochondrial Genome Conferring the Wild Abortive Type of Cytoplasmic Male Sterility in Rice

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2007年第6期49卷 908-914页

作者： zhen-Lan Liu Hong Xu Jing-Xin Guo Yao-guang Liu Key Laboratory of Plant Functional Genomics and Biotechnology of Education Department Guangdong Province College of Life Sciences South China Agricultural University Guangzhou 510642 China

The so-called ＂wild abortive＂（WA） type of cytoplasmic male sterility （CMS） derived from a wild rice species Oryza rufipogon has been extensively used for hybrid rice breeding. However, extensive analysis of the structure of the related mitochondrial genome has not been reported, and the CMS-associated gene（s） remain unknown. In this study, we exploited a mitochondrial genome-wide strategy to examine the structural and expressional variations in the mitochondrial genome conferring the CMS. The entire mitochondriai genomes of a CMS-WA line and two normal fertile rice lines were amplified by Long-polymerase chain reaction into tilling fragments of up to 15.2 kb. Restriction and DNA blotting analyses of these fragments revealed that structural variations occurred in several regions in the WA mitochondrial genome, as compared to those of the fertile lines. All of the amplified fragments covering the entire mitochondrial genome were used as RNA blot probes to examine the mitochondriai expression profile among the CMS-WA and fertile lines. As a result, only two mRNAs were found to be differentially expressed between the CMS-WA and the fertile lines, which were detected by a probe containing the nad5 and orf153 genes and the other having the ribosomal protein gene rpl5, respectively. These mRNAs are proposed to be the candidates for further identification and functional studies of the CMS gene.

关键词： cytoplasmic male sterility mitochondrial genome rice transcription.

Parameterized Littlewood-Paley Operators and Area Integrals on Weak Hardy Spaces

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2013年第10期29卷 1857-1870页

作者： Yan LIN Zong guang LIU Dong Lan MAO zhen Kai SUN School of Sciences China University of Mining and Technology

In this paper, we establish the boundedness of parameterized Littlewood-Paley operator μλ^＊,p and parameterized area integralμΩ^σSp with kernel satisfying the logarithmic type Lipschitz condition on the weak Ha... 详细信息

关键词： Parameterized Littlewood-Paley operator parameterized area integral weak Hardy space