检索结果-南通市图书馆

Geothermoba.ometry of a.ka.un Pluton in Ouzella.h-Sirwa.Promontory (Centra. a.ti-a.la.;Morocco)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journa. of Geology 2012年第3期2卷 136-147页

作者： a.desla. Toummite moha ikenne El Ha.sa.e Bera.ouz a.plied Geology a.d Environmenta. Geology La.ora.ory Faculty of Sciences Ibn Zohr University Agadir Morocco

Rocks of the la.e Neoproterozoic a.ka.un pluton (558 ± 2 Ma. loca.ed in the Ouzella.h-Sirwa.promontory (a.ti-a.la.) include ma.ma.ic microgra.ula. encla.es (MMEs) ra.ging from rounded to ovoid in sha.e, da.k a.d fine gra.ned a.d genera.ly 5 to 10 cm in size, some rea.hing a.size of 50 cm. They a.e composed of microdiorite, qua.tz microdiorite a.d micromonzodiorite, wherea. the felsic host rocks comprise ma.nly qua.tz-diorite a.d a.phibole-biotite gra.odiorite ba.ed on minera.ogica. compositions. The minera. a.sembla.e is simila. to those described in their hosting gra.itoids but with different proportions. in this study composition of minera.s is used to describe the na.ure of the ma.ma.a.d estima.e the pressure, tempera.ure a.d oxygen fuga.ity a. which a.ka.un pluton is empla.ed. Ba.ed on chemistry of biotite a.ka.un pluton formed from ca.c-a.ka.ine ma.ma. Compositions of pla.iocla.e (a.5 - a.29);hornblende (Mg ≠= 0.59 - 0.65) a.d biotite (Mg ≠= 0.49 - 0.55) of MMEs a.e slightly distinct or simila. to those of host rocks (a.7-40;hbl Mg ≠= 0.64 - 0.69;Bi Mg ≠= 0.49 - 0.50) which suggest pa.tia. to complete equilibra.ion during ma.ic-felsic ma.ma.intera.tion. The coexisting hornblende a.d pla.iocla.e (hornblende-pla.iocla.e thermometry), a. content in hornblende (a.uminum-in-hornblende ba.ometry) a.d the a.sembla.e tita.ite-ma.netite-qua.tz were used to constra.n the P, T a.d fO2 during the crysta.liza.ion of the pa.ent ma.ma.. The a.ka.un pluton wa. empla.ed a. tempera.ure ca. 504°C - 633°C a.d a. pressure ca. 0.9 - 4.66 ± 0.6 Kba.s (a.era.e depth = 6.5 km) from a.highly oxidized ma.ma.(log fO2 = ?24.8 to ?19.2).

关键词： a.ka.un Pluton MMEs Hornblende Thermoba.ometry Ouzella.gh-Sirwa Promontory a.ti-a.la. Morocco

a.Novel Methodology to Design Minia.urized Regula. Pla.a. inverted-F a.tenna. Ba.ed on Pa.a.etric Simula.ions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journa. of Electroma.netic a.a.ysis a.d a.plica.ions 2013年第7期5卷 302-311页

作者： a.delha.im Eloua.ih a.med Oula.-Sa.d moha Mra.et Ha.sa.i Depa.tment of Electrica. a.d Telecommunica.ions Engineering Royal Air Academy (ERA) Marrakesh Morocco Depa.tment of Physics Semlalia University of Sciences (FSSM) Marrakesh Morocco

This pa.er describes a.novel methodology to design PiFa.(Pla.a. inverted-F a.tenna. a.tenna. ba.ed on pa.a.etric simula.ions. The pa.a.eters considered in the pa.a.etric design a.e ground pla. dimensions, height of ra.ia.ing pla.e, feeding point position, shorting pla.e width a.d position. The choice of the pa.a.eters tha. must be va.ied independently or simulta.ously is importa.t to design optimized a.tenna. The a.thor studied two scena.ios in precedent works [1,2]. He exposes here a.third scena.io of va.ing a.tenna.pa.a.eters to design a.d simula.e by HFSS (High Frequency Simula.or Structure) simula.or a.probe-fed dua. ba.d PiFa.for the use in GSM 850 ba.d (824 MHz - 894 MHz) a.d PCS 1900 ba.d (1850 MHz - 1990 MHz). The a.thor compa.es the three scena.ios a.d esta.lishes a.novel methodology to design optimized a.d minia.urized a.tenna. mounted on mobile ha.dsets.

关键词： PiFA HFSS Design Methodology

Design a.d Pa.a.etric Simula.ion of a.Minia.urized PiFa.a.tenna.for the PCS Ba.d

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Wireless Engineering a.d Technology 2013年第2期4卷 105-111页

This pa.er describes the design a.d simula.ion by HFSS simula.or of a.probe-fed Pla.a. inverted-F a.tenna.(PiFa. for the use in PCS ba.d [1850 MHz - 1990 MHz]. a.methodology ba.ed on pa.a.etric simula.ions (pa.a.eters a.e ground pla. dimensions, height of ra.ia.ing pla.e, feeding point position, shorting pla.e dimensions a.d positioning) wa. used to design optimized a.tenna. The simula.ion a.lowed the cha.a.teriza.ion of the designed a.tenna.a.d the computing of different a.tenna.pa.a.eters like S11 pa.a.eter, resona.t frequency, SWR, ba.dwidth impeda.ce in feeding point, ga.n, 2D a.d 3D dia.ra. pa.tern, Fields distribution. The simula.ion results a.e interesting a.d respect the mea. PCS requirements.

关键词： PCS HFSS PiFA Pa.ch a.tenna Pa.a.etric Simula.ion

Design a.d Simula.ion by HFSS of a.Slim UWB PiFa.a.tenna

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 Journa. of Engineering a.d Technology 2013年第2期1卷 17-22页

作者： a.delha.im Eloua.ih a.med Oula.-Sa.d moha Mra.et Ha.sa.i Depa.tment of Electrica. a.d Telecommu- nica.ions Engineering Royal Air Academy (ERA) Marrakesh Morocco Depa.tment of Physics Semlalia University of Sciences (FSSM) Marrakesh Morocco

This pa.er describes the design a.d simula.ion by High Frequency Structure Simula.or (HFSS) of a.probe-fed Pla.a. inverted-F a.tenna.(PiFa. for the Ultra.Wide Ba.d (UWB) persona. a.ea.networks. The slim a.tenna.presents a.height of 2 mm a.d a.ba.dwidth of more tha. 766 MHz. This ba.dwidth wa. improved by etching a.U-slot in the a.tenna.pa.ch. The ba.dwidth offered then by the a.tenna.is 839 MHz a.ound the resona.t frequency of 9 GHz. The improvement of ba.dwidth wa. a.compa.ied by decrea.ing in ga.n a.d ra.ia.ion efficiency. The simula.ion a.lowed the cha.a.teriza.ion of the designed a.tenna.a.d the computing of different a.tenna.pa.a.eters like S11 pa.a.eter, resona.t frequency, ba.dwidth, ra.ia.ion efficiency, ga.n a.d dia.ra. pa.tern. The results a.e very interesting a.d respect the Federa. Communica.ions Commission (FCC) requirements.

关键词： PiFA HFSS UWB

Design a.d Simula.ion of a.PiFa.a.tenna.for the Use in 4G Mobile Telecommunica.ions Networks

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

interna.iona. Journa. of Communica.ions, Network a.d System Sciences 2013年第7期6卷 325-332页

作者： a.delha.im Eloua.ih a.med Oula.-Sa.d moha Mra.et Ha.sa.i Depa.tment of Physics Semlalia University of Sciences (FSSM) Marrakesh Morocco

This pa.er describes the design a.d simula.ion by HFSS simula.or of a.probe-fed a.d multi-ba.d Pla.a. inverted-F a.tenna.(PiFa. for the 4G mobile networks. The a.tenna.works in 8 ba.ds. Five ba.ds a.e a.ctioned by FCC for 4G (LTE a.d WiMa.) such 710 MHz, 1900 MHz (PCS), 2.3 GHz (WCS ba.d), 3.65 GHz (rura. 4G) a.d 5.8 GHz (FCC unlicensed ba.d). The a.tenna.a.lows working a.ound 910 MHz iSM ba.d. The GPS signa. ca. be received in GPS L2 ba.d a.ound the frequency 1575 MHz. The a.tenna.offers a.so a.wideba.d a.ound 8.62 GHz. The simula.ion a.lowed the cha.a.teriza.ion of the designed a.tenna.a.d the computing of different a.tenna.pa.a.eters like S11 pa.a.eters, resona.t frequency, ba.dwidth, ra.ia.ion efficiency, ga.n a.d dia.ra. pa.tern. The results a.e very interesting a.d respect mostly the requirements.

关键词： PiFA HFSS 4G iSM GPS

Design a.d Pa.a.etric Simula.ion of a.Bi-Ba.d Minia.urized PiFa.a.tenna.for the GSM900 a.d DCS1800 Ba.ds

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journa. of Electroma.netic a.a.ysis a.d a.plica.ions 2013年第5期5卷 189-195页

作者： a.delha.im Eloua.ih a.med Oula.-Sa.d moha Mra.et Ha.sa.i Depa.tment of Electrica. a.d Telecommunica.ions Engineering Royal Air Academy (ERA) Marrakesh Morocco Depa.tment of Electrica. a.d Telecommunica.ions Engineering Royal Air Academy (ERA) Marrakesh Morocco Depa.tment of Physics Semlalia University of Sciences (FSSM) Marrakesh Morocco.

This pa.er describes the design a.d simula.ion by HFSS simula.or of a.probe-fed Pla.a. inverted-F a.tenna.(PiFa. for the use in GSM900 ba.d [890 MHz - 960 MHz] a.d DCS1800 ba.d [1710 MHz - 1880 MHz]. a.methodology ba.ed on pa.a.etric simula.ions (pa.a.eters a.e ground pla. lenght, height of ra.ia.ing pla.e, feeding point position, shorting pla.e width a.d position) wa. used to design optimized a.tenna. The simula.ion a.lowed the cha.a.teriza.ion of the designed a.tenna.a.d the computing of different a.tenna.pa.a.eters like S11 pa.a.eter, resona.t frequency, VSWR, ba.dwidth, impeda.ce in feeding point, ga.n, dia.ra. pa.tern a.d Fields distribution. The results were very interesting a.d respect the GSM requirements.

关键词： GSM DCS HFSS PiFA Pa.ch a.tenna Pa.a.etric Simula.ion

Effect of fluoride trea.ment on corrosion beha.ior of Mg-Ca.bina.y a.loy for impla.t a.plica.ion

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论