检索结果-南通市图书馆

高危心肌梗死患者发生心律失常性和非心律失常性死亡风险的时间变化趋势:对多中心试验的综合分析

世界核心医学期刊文摘(心脏病学分册) 2006年第2期 46-47页

作者： yap y. g. 杜媛 Department of Cardiolog.cal Sciences St. g.org.’ s Hospital Medical School Cranmer Terrace London SW17 0RE United King.om

Aims: An understanding.of the temporal trends on the risks of arrhy.hmic death(AD) vs. non-arrhy.hmic deaths(NAD) after my.cardial infarction(MI) is crucial in deciding.the optimal timing.for risk stratification and treatment window for prophy.actic antiarrhy.hmic treatment. However, contemporary.data on such information is lacking. Methods and results: Individual patient data were pooled from th placebo arms of EMIAT, CAMIAT, SWORD, TRACE, and DIAMOND-MI who had a recent MI and left ventricular ejection fraction(LVEF)g.ted for all studies from day.45 after acute my.cardial infarction(AMI) to account for different recruitment periods between trials, and then from the onset of MI for TRACE and DIAMOND-MI that recruited patients within 2 weeks after MI. In total, 3104 patients(median ag. 65, rang.: 23-92; 2471 males)were pooled from all five studies, with a total of 487 deaths at 2-y.ar follow-up; 220 deaths were ADs and 172 were NADs. The risks of both AD and NAD were hig.est in the first 6 months but the risk of AD was consistently.hig.er than that of NAD throug.out the 2-y.ar period[rate of death/100 person-y.ar at risk(AD/NAD): 8.09/6.07(45 day. to 6 months), 4.07/3.35(>6-12 months), 4.34/3.60(>12-18 months), 3.76/2.77(>18-24 months)]. There were sig.ificant interactions between the temporal trends of mortalities and g.nder(P=0.03) and history.of hy.ertension(P=0.04). A similar trend was observed when mortality.was measured from time of onset of MI from the combined TRACE and DIAMOND-MI dataset. Conclusion: Our study.provided the first contemporary.evidence that in hig.-risk post-MI patients with LVEFg.er than that of NAD for up to 2 y.ars althoug. in female patients, they.became increasing.y.more likely.to die from NAD after 6 months. Therefore, risk stratification of post-MI patient at hig. risk of AD remains a worthwhile exercise. Howeve

关键词：心律失常患者危险分层 AD

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

Mechanosy.thesis and mechanochemical treatment of bismuth-doped vanadium phosphorus oxide cataly.ts for the partial oxidation of n-butane to maleic anhy.ride

引用

Journal of Natural g.s Chemistry 2008年第3期17卷 232-237页

作者： y. H. Taufiq-yap y.C. Wong.y. Kamiy. W.J. Tang Putra Center for Cataly.is Science and Technolog. Department of Chemistry Faculty of Science Universiti Putra Malaysia 43400 UPM Serdang Selangor Darul Ehsan Malaysia g.aduate School of Environmental Science Hokkaido Universit3 Sapporo 060-0810 Japan

Three Bi-doped vanady. py.ophosphate cataly.ts were prepared via dihy.rate route （VPD method）, which consisted of different preparation methods including.mechanosy.thesis, mechanochemical treatment, and the conventional reflux method. The cataly.ts produced by.the above three methods were characterized by.x-ray.diffraction （XRD）, scanning.electron microscopy.（SEM）, and temperature prog.ammed reduction （TPR）. Cataly.ic evaluation for the partial oxidation of n-butane to maleic anhy.ride （MA） was also carried out. The XRD patterns of all the Bi-doped cataly.ts showed the main peaks of py.ophosphate phase. Lower intensity.peaks were observed for the mechanochemically.treated Bi-doped cataly.t （VPDBiMill） with two additional small peaks corresponding.to the presence of a small amount of V5＋ phase. The TPR profiles showed that the hig.est amount of active oxy.en species, i.e, V4＋–O- pair, responsible for n-butane activation, was removed from VPDBiMill. Furthermore, from the cataly.ic test results, the g.aph of selectivity.to MA as a function of the conversion of n-butane demonstrated that VPDBiMill was the most selective cataly.t. This sug.ests that the mechanochemical treatment of vanadium phosphate cataly.t （VPDBiMill） is a potential method to improve the cataly.ic properties for the partial oxidation of n-butane to maleic anhy.ride.

关键词： mechanosy.thesis mechanochemical treatment bismuth vanady. py.ophosphate

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

Promotional Effect of Bismuth as Dopant in Bi-Doped Vanady. Py.ophosphate Cataly.ts for Selective Oxidation of n-Butane to Maleic Anhy.ride

引用

Journal of Natural g.s Chemistry 2006年第4期15卷 297-302页

作者： y.H.Taufiq-yap y.Kamiy. K.P.Tan Department of Chemistry Universiti Putra Malaysia43400 UPM SerdangSelangorMalaysia g.aduate School of Environmental Earth Science Hokkaido UniversitySapporo 060-0810Japan

Bismuth-promoted （1% and 3%） vanady. py.ophosphate cataly.ts were prepared by.refluxing.Bi（NO3）4.5H2O and VOPO4.2H2O in isobutanol. The incorporation of Bi into the cataly.ts lattice increased the surface area and lowered the overall V oxidation state. Profiles of temperature prog.ammed reduction （TPR） in H2 show a sig.ificant shift of the maxima of major reduction peaks to lower temperatures for the Bi-promoted cataly.ts. A new peak was also observed at the low temperature reg.on for the cataly.t with 3% of Bi dopant. The addition of Bi also increased the total amount of oxy.en removed from the cataly.ts. The reduction pattern and reactivity.information provide fundamental insig.t into the cataly.ic properties of the cataly.ts. Bi-promoted cataly.ts were found to be hig.ly.active （71% and 81% conversion for 1% and 3% Bi promoted cataly.ts, respectively. at 703 K）, as compared to the unpromoted material （47% conversion）. The hig.er activity.of the Bi-promoted cataly.ts is due to that these cataly.ts possess hig.ly.active and labile lattice oxy.en. The better cataly.ic performance can also be attributed to the larg.r surface area.

关键词： bismuth promoter vanady. py.ophosphate n-butane oxidation

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

n-Butane Oxidation over γ-Al_2O_3 Supported Vanadium Phosphate Cataly.ts

引用

Journal of Natural g.s Chemistry 2007年第3期16卷 266-272页

作者： y.H.Taufiq-yap L.K.Leong.R.Irmawati Putra Laboratory.for Cataly.is Science and Technolog. Department of ChemistryFaculty of ScienceUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Department of Bioscience and Chemistry Faculty of Engineering and ScienceUniversiti Tunku Abdul RahmanJalan Genting Kelang53300 SetapakKuala LumpurMalaysia

Four vanadium phosphate cataly.ts supported on γ-A1203 （20 wt%） were sy.thesized via wetness impreg.ation of VOHPO4.0.5H2O precursor and calcined for different durations （6, 10, 30 and 75 h） at 673 K in a reaction flow of n-butane/air mixture. The samples calcined for 6 and 10 h produced only.a sing.e phase of （VO）2P2O7. However, the VOPO4 phase （β-VOPO4） was detected and became more prominent with only.a minor py.ophosphate peaks were found after 30 h of calcination. All these py.ophosphate peaks disappeared after 75 h of calcination. The formation of V^5＋ phase was also observed in the SEM microg.aphs. The redox properties and the nature of oxidants of the cataly.ts employ.d in this study.were investig.ted by.H2-TPR analy.is. Selective oxidation of n-butane to maleic anhy.ride （MA） over these cataly.ts shows that the percentag. of n-butane conversion decreases with the transformation of the cataly.ts from V^4＋ to V^5＋ phases. An appropriate ratio of V^5＋/V^4＋ can enhance the performance of the VPO cataly.t. However, a hig.er amount of V^5＋ and its associated oxy.en species are responsible to promote the MA selectivity.

关键词： n-butane oxidation VPO alumina maleic anhy.ride

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

Sy.thesis of self-assembled nanorod vanadium oxide bundles by.sonochemical treatment

引用

Journal of Natural g.s Chemistry 2009年第3期18卷 312-318页

作者： y.H.Taufiq-yap y.C.Wong.Z.Zainal M.Z.Hussein Centre of Excellence for Cataly.is Science and Technolog. Faculty of ScienceUniversiti Putra Malaysia Department of Chemistry Faculty of ScienceUniversiti Putra Malaysia

Self-assembled nanorod of vanadium oxide bundles were sy.thesized by.treating.bulk V2O5 with hig. intensity.sonochemical technique. The sy.thesized materials were characterized by.X-ray.diffraction （XRD）, scanning.electron microscope （SEM）, transmission electron microscope （TEM） and temperature-prog.ammed reduction （TPR） in H2. Cataly.ic behaviour of the materials over anaerobic n-butane oxidation was studied throug. temperature-prog.ammed reaction （TPRn）. Cataly.ic evaluation of the sonochemical treated V2O5 products was also studied on microreactor. XRD patterns of all the vanadium samples were perfectly.indexed to V2O5. The morpholog.es of the nanorod vanadium oxides as shown in SEM and TEM depended on the duration of the ultrasound irradiation. Prolong.ng.the ultrasound irradiation duration resulted in materials with uniform, well defined shapes and surface structures and smaller size of nanorod vanadium oxide bundles. H2-TPR profiles showed that larg.r amount of oxy.en species were removed from the nanorod V2O5 compared to the bulk. Furthermore, the nanorod vanadium oxide bundles, which were produced after 90, 120 and 180 min of sonochemical treatment, showed an additional reduction peak at lower temperature （-850 K）, sug.esting.the presence of some hig.ly.active oxy.en species. TPRn in n-butane/He over these materials showed that the nanorod V2O5 with hig.ly.active oxy.en species showed markedly.hig.er activity.than the bulk material, which was further proven by.cataly.ic oxidation of n-butane.

关键词： nanorod vanadium oxide sonochemical treatment butane oxidation

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

Effect of tellurium promoter on vanadium phosphate cataly.t for partial oxidation of n-butane

引用

Journal of Natural g.s Chemistry 2011年第6期20卷 635-638页

作者： y.H.Taufiq-yap S.Nor Asrina g.J.Hutching. N.F.Dummer J.K.Bartley Centre of Excellence for Cataly.is Science and Technolog. Faculty of ScienceUniversiti Putra Malaysia Department of Chemistry Faculty of ScienceUniversiti Putra Malaysia Cardiff Cataly.is Institute School of ChemistryCardiff University

Te-promoted （1%） vanadium phosphate cataly.t （VPDTe） was prepared via VOPO4·2H2O by.calcining.its precursor VOHPO4·0.5H2O in a flow of n-butane/*** cataly.t has resulted a hig.er existence of V5＋ phase with V5＋/V4＋ ratio of *** microg.aphs show that Te addition altered the arrang.ment of the platelets from ＂rose-like＂ clusters to lay.r with irreg.lar *** addition has also markedly.lowered the reduction activation energ.es of the vanadium phosphate cataly.t as revealed by.TPR *** amount of active oxy.en species associated with V4＋ phase of the Te promoted cataly.t was sig.ificantly.hig.er than those of the unpromoted *** observations sug.est that hig. mobility.and availability.of reactive oxy.en species contributed to the enhancement of n-butane conversion up to 80% at 673 K,while only.47% over unpromoted cataly.t （2400 h^-1,1.7% n-butane in air）.

关键词： vanadium phosphate tellurium promoter butane oxidation

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

g.aphene Oxide-Based Q-Switched Erbium-Doped Fiber Laser

引用

Chinese Phy.ics Letters 2013年第2期30卷 124-127页

作者： y.K.yap N.M.Huang.S.W.Harun H.Ahmad Photonics Research Centre Department of PhysicsFaculty of ScienceUniversity of Malaya50603 Kuala LumpurMalaysia Low Dimensional Materials Research Centre Department of PhysicsFaculty of ScienceUniversity of Malaya50603 Kuala LumpurMalaysia Department of Electrical Eng.neering Faculty of EngineeringUniversity of Malaya50603 Kuala LumpurMalaysia Nanotechnolog.0}Research Alliance Universiti Teknologi Malaysia81310 UTMJohore BahruJohor Darul TakzimMalaysia

We demonstrate a pulsed ring.erbium-doped fiber laser based on g.aphene oxide(g.),employ.ng.a simplified Hummer's method to sy.thesize the g. via chemical oxidation of g.aphite flakes at room *** dipping.a fiber ferrule end face onto the g. suspension,g. is successfully.coated onto the end face,making.it a simple saturable absorption device.A stable Q-switched pulsed fiber laser is achieved with a low pump threshold of 9.5 mW at 980 *** pulse repetition rate rang.s from 16.0 to 57.0 *** pulse width and the pulse energ.0}are studied and discussed.

关键词： temperature. fiber pulse

来源：

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

PROMOTIONAL EFFECT OF BISMUTH AS DOPANT IN BI-DOPED VANADy. Py.OPHOSPHATE CATALy.TS FOR SELECTIVE OXIDATION OF N-BUTANE TO MALEIC ANHy.RIDE

PROMOTIONAL EFFECT OF BISMUTH AS DOPANT IN BI-DOPED VANADYL ...

引用

40th IUPAC Cong.ess

作者： y.H. Taufiq-yap y. Kamiy. K.P. Tan Department of Chemistry Universiti Putra Malaysia43400 UPM SerdangSelangorMalaysia. g.aduate School of Environmental Earth Science Hokkaido UniversitySapporo 060-0810Japan. Department of Chemistry Universiti Putra Malaysia43400 UPM SerdangSelangorMalaysia.

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

A combo technolog.0}of autotrophic and heterotrophic denitrification processes for g.oundwater treatment

引用

Chinese Journal of Chemical Eng.neering 2021年第9期34卷 121-127页

作者： Cemile Sey.a Arzum yapıcı Dilan Toprak Müjg.n y.ldız Sinan Uy.nık y.kup Karaaslan Deniz Uçar Environmental Eng.neering.Department Engineering FacultyHarran UniversitySanliurfa 63100Turkey g.p Renewable Energ.0}and Energ.0}Efficiency.Center Harran UniversitySanliurfa 63100Turkey g.neral Directorate of Water Manag.ment Republic of Turkey Ministry of Agriculture and Forestry Bestepe MahallesiYenimahalle 06560Turkey

In this study.a sequential process(heterotrophic up-flow column and completely.mixed membrane bioreactors)was proposed combining.advantag.s of the both *** sy.tem was operated for 249 day. with simulated and real g.oundwater for nitrate removal at concentrations vary.ng.from 25 to 145 mg.L^(-1) NO_(3)^(-)-*** contribution of heterotrophic process to total nitrate removal in the sy.tem was controlled by.dozing.the ethanol considering.the nitrate *** this way.sulfur based autotrophic denitrification rate was decreased and the effluent sulfate concentrations were *** alkalinity.requirement in the autotrophic process was produced in the heterotrophic reactor,and the sy.tem was operated without alkalinity.*** the study.the chemical oxy.en demand in the heterotrophic reactor effluent was(23.7±22)mg.L^(-1) and it was further decreased to(7.5±7.2)mg.L^(-1) in the sy.tem effluent,corresponding.to a 70%*** the last period of the study.the real g.oundwater containing.145 mg.L^(-1) NO_(3)^(-)-N was completely.*** was operated without chemical washing.in the first 114 *** day. 115-249 weekly.chemical washing.was required.

关键词： Nitrate removal Bioreactor Bioprocess Anaerobic process g.oundwater treatment

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

Effects of Milling.Duration on Malay.ian Dolomite to Enhance Hy.rog.n Production via g.sification of Oil Palm Fronds

Effects of Milling Duration on Malaysian Dolomite to Enhance...

引用

2012 4th International Conference on Chemical,Biolog.cal and Environmental Eng.neering

作者： A. R. Nur-Faizal M. Z. Hussein y. H. Taufiq-yap Center of Excellence for Cataly.is Science and Technolog. Faculty of ScienceUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Department of Chemistry Faculty of ScienceUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia

The purpose of this work is to investig.te the effect of mechanochemical treatment on Malay.ian dolomite towards the enhancement of hy.rog.n production from g.sification reaction of oil palm fronds (OPF).To accomplish the objective,Malay.ian dolomite was subjected to hig. energ.0}planetary.ball mill for 1,2 and 4 h in *** milling.process reduced the particle size of the cataly.ts and consequently.increased their surface *** cataly.ic activity.was investig.ted throug. temperature prog.ammed g.sification (TPg..The cataly.t premixed with the biomass in a ratio of 1:1 and underg.ne TPg.under partial oxy.en environment (5% O2 in He) tested from ambient temperature up to 900oC with heating.rate 10oC/*** the g.ses produced were detected by.online mass *** milled cataly.ts prominently.showed the increasing.of H2 production tog.ther with the reduction of CO2 produced due to the dual function of cataly.ts which acted as tar reduction and CO2 sorbent.

关键词： Dolomite,Hy.rog.n production,CaO,Oil palm fronds,Mechanochemical treatment.

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：