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Low-Profile Reconfigura.le UWB Fra.ta. a.tenna.Enha.ced by Pa.a.itic Elements for Wireless a.plica.ions

PROGRESS IN ELECTROMa.NETICS RESEa.CH LETTERS 2025年 126卷 37-48页

作者： marzouk, Moha.ed Nejdi, Ibra.ime H. Rha.i, Youssef Sa.h, Moha.ed Na.ir, Ja.a. a. Da.er, a.dulra.ma. Hussein, Mousa.I. Za.a.ia. Za.rila.ha.a.-Gburi, a.med J. a. Sultan Moulay Slimane Univ Fac Sci & Technol Microelect Embedded Syst & Telecommun Beni Mellal Morocco Sultan Moulay Slimane Univ Fac Sci & Technol Automat & Energy Convers Beni Mellal Morocco Gomal Univ Fac Engn & Technol Dept Elect Engn Dera Ismail Khan Pakistan United Arab Emirates Univ Elect & Commun Engn Dept Al Ain U Arab Emirates Univ Tekn Malaysia Melaka UTeM Ctr Telecommun Res & Innovat CeTRI Fak Teknol & Kejuruteraan Elekt & Komputer FTKEK Jalan Hang Tuah Jaya Durian Tunggal 76100 Melaka Malaysia

This pa.er presents a. enha.ced design of a.reconfigura.le fra.ta. ultra.wideba.d (UWB) a.tenna. improved through the inclusion of pa.a.itic elements. The a.tenna.incorpora.es two plus-sha.ed pa.a.itic elements a.d a.hexa.ona. ra.ia.ing pa.ch, while ma.nta.ning compa.t dimensions of 30 mm x 22 mm x 1.6 mm on a. FR4 substra.e. a.pa.tia. ground pla.e with a. integra.ed recta.gula. slot is etched on the ba.kside of the resona.or. The a.tenna.wa. designed using HFSS, fa.rica.ed, a.d experimenta.ly va.ida.ed. The mea.ured results show good a.reement with the simula.ions. It opera.es over a.frequency ra.ge of 4 to 10.57 GHz, with resona.t frequencies a. 4.7, 7.92, a.d 10 GHz. The design a.hieves a.ga.n between 2.76 a.d 5.83 dB a.d ma.nta.ns high ra.ia.ion efficiency ra.ging from 82% to 95%. To further enha.ce performa.ce, two stra.egica.ly pla.ed HPND-4005 PIN diodes a.e incorpora.ed, a.lowing tuna.le resona.ce cha.a.teristics by a.tering current distribution under va.ious switch configura.ions. a. a.result, the reconfigura.le a.tenna.extends its opera.iona. ba.dwidth from 3 to 14 GHz, ma.ing it suita.le for a.va.iety of wireless a.plica.ions such a. Wi-Fi, WiMa., WLa., a.d C-, X-, a.d Ku-ba.d communica.ions. Nota.ly, the design a.hieves this wideba.d reconfigura.ility using only two PIN diodes while ma.nta.ning a.compa.t footprint - offering a. a.va.ta.e over previous designs. Its fea.ures support sea.less integra.ion into compa.t electronic devices, ena.ling ma.ufa.turers to incorpora.e multiple a.tenna. with minima. complexity.

关键词： Fra.ta. dimension

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Performa.ce enha.cement of helica. tube hea. excha.gers ba.ed on constructa. theory

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JOURNa. OF THERMa. a.a.YSIS a.D Ca.ORIMETRY 2025年 1-13页

作者： marzouk, S. a. a.ou a.-Sood, M. M. El-Sa.d, Ema. M. S. Younes, M. M. El-Fa.ha.a.y, Ma.da.K. Kafrelsheikh Univ Fac Engn Mech Engn Dept Kafrelsheikh Egypt Damietta Univ Fac Engn Mech Engn Dept Dumyat Egypt

Constructa. theory ca. provide insights into how to design HXs for ma.imum efficiency. In this study, numerica. a.a.ysis is performed to study the therma. a.d hydra.lic performa.ce of tree-sha.ed tube configura.ions (TSTC) a.d compa.e it with helica. configura.ion (HTC) in a.helica. tube HX. The therma. performa.ce pa.a.eters such a. overa.l hea. tra.sfer coefficient (U) a.d exergy efficiency a.e studied wherea. hydra.lic pa.a.eter such a. pressure drop (tria.gle P) is investiga.ed where the Reynolds number (Re) cha.ged from 6720 to 10,320. To express the rela.ion between the therma. a.d hydra.lic pa.a.eters, the coefficient of performa.ce (COP) is illustra.ed. The distributions of tempera.ures, pressures, a.d velocities of hot a.d cold wa.er for TSTC a.d HTC a.e exa.ined. The numerica. model is va.ida.ed a.d compa.ed with previous experimenta. results, a.d the error percenta.es a.e a.cepta.le. The TSTC enha.ces hea. tra.sfer in HXs with a.U enha.cement ra.io of a.proxima.ely 232% when compa.ed to tra.itiona. HTC. TSTC is more efficient tha. HTC a. reducing pumping powers, with a.pressure decrea.e ra.io of a.out 49%. The tree-sha.ed tubes outperform the helica. tube excha.ger beca.se the va.ues of COP for the TSTC a.e grea.er tha. those for HTC a. the sa.e ra.ge of Re numbers. The exergy efficiency rises a. the Re number rises, with TSTC ha.ing the ma.imum exergy efficiency. Tempera.ure contours demonstra.e tha. in the TSTC, more hea. is tra.sferred from the hot wa.er to the cold wa.er beca.se there a.e more pa.ses through the tree-sha.ed tubes. The a.va.ta.e of the TSTC over the conventiona. helica. form for velocity destitution is expla.ned by velocity contours a.d strea.lines.

关键词： Tree-sha.ed tubes Helica. tube hea. excha.ger Constructa. theory Hea. tra.sfer enha.cement

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Sa.isfa.tion a.d a.xiety level during clinica. tra.ning a.ong nursing students

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BMC NURSING 2023年第1期22卷 187-187页

作者： a.med, Fa.a.sa.a. a.ra.hidi, Nojoud Moha.ed, Ra.ha.a. a.iri, a.dula.iz a. a.i, a.er a.y, Kha.ed H. Nouh, Wa.l G. Demerda.h, Neha. a. marzouk, Sa.wa.a.i Oma., a.a. M. marzouk, marzouk M. a.ka.a.h, Sa.a.H. Moursy, Shima. M. Fa.ila. Doa. E. Eldin, Sa.a. S. a.mowa.y, a.eer a. Univ Bisha Coll Appl Med Sci Alnamas Bisha Saudi Arabia Assiut Univ Fac Nursing Pediat Nursing Dept Assiut Egypt Univ Hail Coll Nursing Maternal & Child Hlth Hail Saudi Arabia Mansoura Univ Fac Nursing Community Hlth Nursing Mansoura Egypt Univ Bisha Coll Appl Med Sci Bisha Bisha Saudi Arabia Jouf Univ Coll Appl Med Sci Dept Nursing Qurayyat Saudi Arabia Fayoum Univ Fac Nursing Matern & Neonatal Hlth Nursing Al Fayyum Egypt Al Azhar Univ Damietta Fac Med Publ Hlth & Community Med Dumyat Egypt Umm Al Qura Univ Fac Med Community Med & Healthcare Al Qunfudah Saudi Arabia Menoufia Univ Fac Med Family Med Dept Menoufia Egypt Mansoura Univ Fac Nursing Gerontol Nursing Dept Mansoura Egypt Taibah Univ Coll Nursing Gerontol Nursing Community Hlth Nursing Madinah Saudi Arabia Menoufia Univ Fac Nursing Pediat Nursing Dept Menoufia Egypt Al Azhar Univ Int Islamic Ctr Populat Studies & Res Cairo Egypt

Ba.kgroundQua.ity is a.prima.y concern of hea.th ca.e a.encies worldwide. a.conducive clinica. tra.ning environment is essentia. for nursing students to be ca.a.le of enha.cing their lea.ning experiences a.d a.hieving the desired tra.ning *** study a.med to exa.ine the sa.isfa.tion a.d a.xiety levels during clinica. tra.ning a.ong nursing *** of studya.descriptive -a.a.ytica. cross-sectiona. study design wa. utilized. The resea.ch wa. conducted a. the Fa.ulty of Nursing, a.siut University a.d Colleges of a.plied Medica. Sciences in a.na.a. a.d Bisha. University of Bisha. Sa.pling method: a.convenience sa.pling technique wa. used. Sa.ple size: a.sa.ple of 1052 undergra.ua.e nursing students. The da.a.wa. ga.hered via.a.structured questionna.re including the socio-demogra.hic cha.a.teristics a.d nursing students' sa.isfa.tion with the hospita. a.d la.ora.ory tra.ning. a.ditiona.ly, Self-Ra.ing a.xiety Sca.e (Sa.) wa. a.opted to mea.ure the a.xiety *** mea. a.e of the studied sa.ple wa. 21.9 +/- 1.83 yea.s, a.d 56.9% a.e fema.es. Moreover, 90.1% & 76.4% of the nursing students were sa.isfied with their hospita. a.d la.ora.ory tra.ning. Furthermore, 61.1% & 54.8% of the students ha. mild levels of a.xiety rega.ding their hospita. tra.ning a.d la.ora.ory tra.ning, *** undergra.ua.e nursing students ha. a.high level of sa.isfa.tion with their clinica. tra.ning a. the hospita.s a.d la.ora.ories. Moreover, they ha. mild a.xiety rela.ed to hospita. a.d la.ora.ory clinica. *** clinica. orienta.ion a.d tra.ning progra.s a.d improvement stra.egies to enha.ce the effectiveness of the clinica. tra.ning environment. The esta.lishment of a.modern, ta.tefully designed, a.d fully stocked skill la. for the college's student tra.ning should receive more a.tention.

关键词： Sa.isfa.tion a.xiety Clinica. tra.ning Nursing students

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a.levia.ion of glyphosa.e-induced toxicity by Horsera.ish tree (Moringa.oleifera. Lea. extra.t a.d phyta.e in Nile Tila.ia.(Oreochromis niloticus) highlighting the a.ti-oxida.t, a.ti-infla.ma.ory, a.d a.ti-a.optotic a.tivities

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VETERINa.Y RESEa.CH COMMUNICa.IONS 2025年第3期49卷 1-23页

作者： Ela.wl, Esra. a. a.sa., Doa. H. a.-Ha.a.y, Ibra.im I. Sa.a., a.da.la. S. Ra.a., a.a.y E. Elsheshta.y, a.med a.sa., Mona.a.o-a.-Ela. Ha.tha. G. Foua., a.a.ira.marzouk Elbia.y, Zizy I. Kafrelsheikh Univ Fac Aquat & Fisheries Sci Fish Proc & Biotechnol Dept Kafrelsheikh 33516 Egypt Kafrelsheikh Univ Fac Vet Med Clin Pathol Dept Kafrelsheikh 33516 Egypt Kafrelsheikh Univ Fac Aquat & Fisheries Sci Dept Aquaculture Kafrelsheikh 33516 Egypt Univ Stirling Inst Aquaculture Fac Nat Sci Stirling FK9 4LA Scotland Tanta Univ Fac Pharm Pharmacognosy Dept Tanta 32527 Egypt Suez Univ Fac Fish Resources Dept Aquaculture Suez 43518 Egypt Assiut Univ Fac Vet Med Aquat Anim Med & Management Assiut 71526 Egypt

The da.ger posed by wa.erborne toxicity from herbicides enda.gers the a.ua.ic ecosystem. Using dieta.y medicina. herbs is a.useful a.proa.h to mitiga.e the effects of herbicide toxicity on a.ua.ic a.ima.s. This study a.tempts to exa.ine the consequences a.d potentia. mecha.isms behind the dieta.y a.dition of horsera.ish tree (Moringa.oleifera. lea. extra.t (MOLE) with the help of phyta.e a.dition to check the overa.l growth performa.ce, biochemica. cha.ges, histologica. a.tera.ion, a.d gene expression in norma. a.d a.ter glyphosa.e cha.lenge in Nile tila.ia. a.tota. number of 135 Nile tila.ia.fish (7.93 +/- 0.03 g) were ra.domly a.signed into three groups ea.h in triplica.e. The first group is the control group a.d fed ba.a. diet;the second group supplied with MOLE (200 mg of extra.t/kg), a.d the third group wa. supplied with MOLE (200 mg /kg), a.d phyta.e (0.2g/ kg) for 8 weeks. a.ter the feeding tria., ea.h experimenta. group wa. divided into two subgroups to be uncha.lenged a.d cha.lenged with glyphosa.e (30 mg/L of wa.er). The results decla.ed significa.t enha.cements (P < 0.05) in Weight Ga.n Percent (WG%), Specific growth ra.e (SGR), a.d Protein efficiency ra.io (PER) a.d reducing feed conversion ra.io (FCR) with up-regula.ing hepa.ic gh, igf1,myogenine, intestina. ghrelin a.d NPY in fish groups fed MOLE a.d phyta.e compa.ed with the control group. Moreover, improving the hepa.ic a.tioxida.t ca.a.ity while down-regula.ing hepa.ic igf1bp, myosta.in. Interstingly, MOLE a.d phyta.e lightened glyphosa.e-induced biochemica. a.tera.ions, a.tioxida.ts, a.optosis, a.d infla.ma.ion-a.socia.ed genes compa.ed to the glyphosa.e-cha.lenged group. Interestingly, UPLC-ESI-MS/MS a.a.ysis recognized 16 compounds encompa.ing two glucosinola.es, three fla.onoids, one phenolic a.d three a.ka.oids in a.dition to four fa.ty a.ids, a.terpenoid, one phyta.e a.d a. a.oma.ic glycoside. These components might be a.counta.le for the potentia. effects exerted by MOLE. Therefore, the curre

关键词： Horsera.ish Glyphosa.e Phyta.e Nile tila.ia

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a.comprehensive review of methods of hea. tra.sfer enha.cement in shell a.d tube hea. excha.gers

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JOURNa. OF THERMa. a.a.YSIS a.D Ca.ORIMETRY 2023年第15期148卷 7539-7578页

a.wide ra.ge of studies wa. conducted to increa.e the hea. tra.sfer ra.e a.d reduce the size a.d cost of shell a.d tube hea. excha.gers (STHE). The pa.er's contributions lie in its a.ility to provide a.comprehensive, up-to-da.e, a.d systema.ic overview of the va.ious methods a.a.la.le for hea. tra.sfer enha.cement in STHEs, ma.ing it a. essentia. resource for resea.chers, engineers, a.d pra.titioners in the field of hea. tra.sfer. The studies tha. resea.ched the overa.l hea. tra.sfer coefficient (U), number of tra.sfer units, exergy efficiency, pressure drop, a.d therma.-hydra.lic performa.ce were reviewed. There a.e some a.va.ta.es of the pa.sive method such a. no externa. needed power a.d lower opera.ing cost compa.ed to the a.tive methods. The studies broa.ly support the view tha. hea. tra.sfer enha.cement in STHE is hea.ing towa.d considera.le progress. a.tota. of 47.8% of studies ha.e focused on the pa.sive a.proa.h, the a.r injection method, enha.cing hea. tra.sfer utilizing na.ofluids, a.d compound methods ha.e percenta.es of studies 20.2, 22.3, a.d 9.7%, respectively. The a.r bubble injection ca.ses the rise of the U ra.io where the ma.imum va.ue wa. indica.ed a. 452% compa.ed to only wa.er flow. Swirl va.e, corruga.ed tube, a.d wire coil insert ha.e U ra.io va.ues of 130, 161, a.d 264%, respectively. Na.ofluid results in a.growth in the hea. tra.sfer where the TiO2 ha. the ma.imum U ra.io (175.9%) compa.ed to tra.itiona. fluid. The combina.ion of a.r injection a.d pa.sive hea. a.gmenta.ion methods, which wa. shown to be a.substa.tia. solution to severa. issues, needs to be the focus of more work in the future. Geometrica. cha.ges in tube surfa.es in STHE a.e too required in the future with the use of ma.eria.s coa.ing to enha.ce hea. tra.sfer. The theoretica. a.a.ysis of hea. tra.sfer techniques still needs to be improved, especia.ly for pertinent empirica. formula.ions. a.so, since there a.en't ma.y releva.t numerica. simula.ions, more a.tention is require

关键词： Shell a.d tube hea. excha.ger Hea. tra.sfer enha.cement a.r injection Na.ofluids

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Experimenta. a.d numerica. investiga.ion of a.novel fra.ta. tube configura.ion in helica.ly tube hea. excha.ger

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INTERNa.IONa. JOURNa. OF THERMa. SCIENCES 2023年第1期187卷

The effects of innova.ive fra.ta. configura.ion in helica.ly tubula. hea. excha.gers on therma. a.d hydra.lic performa.ce a.e investiga.ed using numerica. a.d experimenta. methods in this work. With Reynolds (Re) numbers ra.ging from 12,025 to 21,220, the overa.l hea. tra.sfer coefficient (U), pressure drop (delta.P), a.d performa.ce fa.tor (PF) a.e investiga.ed. The fluid flow within a.d outside the tubes is studied using temper-a.ure, velocity, a.d pressure distributions. The numerica. model wa. va.ida.ed by compa.ing the simula.ion results a.d the experimenta. da.a.where the difference between the results wa. found to be a.cepta.le a.d trustworthy. In compa.ison to the sta.da.d helica.ly tube hea. excha.ger (HTHE), the results showed tha. the fra.ta. tube hea. excha.ger (FTHE) is more fa.ora.le to hea. tra.smission. The overa.l hea. tra.sfer coefficient enha.cement ra.io is a.ound 289%. The exergy efficiency increa.es with the rise of the Re number where the fra.ta. tube configura.ion ha. the highest exergy efficiency. The fra.ta. tree-like structure is more beneficia. in decrea.ing pumping powers tha. typica. HTHE, with a.reduction ra.io of delta.P of roughly 57%. a. the sa.e Re number ra.ge, the FTHE ha. a.higher PF tha. the HTHE, indica.ing tha. fra.ta. tree-like hea. excha.gers a.e prefera.le to sta.da.d HTHEs. The fra.ta.-like tree form is grea.er tha. the helica. sha.e for velocity, a.cording to velocity contours a.d strea.lines.

关键词： Hea. excha.ger Fra.ta. tube configura.ion Performa.ce fa.tor Constructa. theory

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Study of hea. tra.sfer a.d pressure drop for novel configura.ions of helica. tube hea. excha.ger: a.numerica. a.d experimenta. a.proa.h

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JOURNa. OF THERMa. a.a.YSIS a.D Ca.ORIMETRY 2023年第13期148卷 6267-6282页

作者： marzouk, S. a. a.ou a.-Sood, M. M. El-Sa.d, Ema. M. S. El-Fa.ha.a.y, Ma.da.K. Younes, M. M. Kafrelsheikh Univ Fac Engn Mech Engn Dept Kafrelsheikh Egypt Damietta Univ Fac Engn Mech Power Engn Dept Dumyat Egypt

In this study, severa. unique tube configura.ions a.e designed a.d modeled to exa.ine the therma. a.d hydra.lic performa.ce of a.helica. tube hea. excha.ger (HTHE) experimenta.ly a.d numerica.ly. For cold a.d hot side tube designs, the numerica. investiga.ion is completed using three-dimensiona. modeling, a.d the findings a.e confirmed using experimenta. da.a.with Reynolds numbers ra.ging from 16,000 to 25,000. Six configura.ions na.ed HTHE1, HTHE2, HTHE3, HTHE4, HTHE5, a.d HTHE6 a.e tested. The findings showed tha. a. compa.ed to the uniform tube distribution, the new a.ra.gements ha.e a.grea.er overa.l hea. tra.sfer coefficient. The overa.l hea. tra.sfer coefficient ha. the highest enha.cement ra.io (125-185%) in the HTHE6 setup with two pa.hwa.s. a.ditiona.ly, it is discovered tha. the pressure drop rises a. the Reynolds number increa.es. The HTHE1 configura.ion ha. the highest pressure drop va.ues, wherea. configura.ions with only one pa.s result in a.grea.er pressure loss when compa.ed to setups with two pa.hs. The va.ues of the coefficient of performa.ce for the HTHE6 a.e la.ger tha. those of other forms, a.d the coefficient of performa.ce decrea.es a. the Reynolds number increa.es. The exergy efficiency grows with the rise of Reynolds number where the HTHE6 ha. the ma.imum va.ue of exergy efficiency compa.ed to other sha.es. The performa.ce of hea. tra.sfer is dra.a.ica.ly improved by the novel tube a.ra.gements, a.though va.ia.ions in pressure drop a.d pumping power a.e only a.little a.fected.

关键词： Helica. tube hea. excha.ger Pressure drop Coefficient of performa.ce Tube configura.ions Hea. tra.sfer enha.cement

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Eva.ua.ing the effects of bifurca.ion a.gle on the performa.ce of a.novel hea. excha.ger ba.ed on contra.tua. theory

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RENEWa.LE ENERGY 2023年第Part1期219卷

In this study, numerica. a.d experimenta. a.a.ysis is presented to study the influences of bifurca.ion a.gles on the thermo-hydra.lic performa.ce in a.novel hea. excha.ger by a.opting contra.tua. theory. The pa.a.eters of overa.l hea. tra.sfer coefficient, exergy efficiency, pressure drop, a.d coefficient of performa.ce a.e investiga.ed with three bifurca.ion a.gles (a.pha.= 120o, 150o, 180o). The ma.s flow ra.e in shell side is consta.t a. 0.33 kg/s wherea. the ma.s flow ra.es in tubes fluctua.e from 0.169 to 0.331 kg/s. The numerica. model wa. a.complished a.d the numerica. results were va.ida.ed by the experimenta. results a.d the error percenta.es a.e a.reea.le. The results show tha. the novel configura.ions of the hea. excha.ger ba.ed on constructed theory enha.ce hea. tra.sfer compa.ed to sta.da.d sha.es. The bifurca.ion a.gle of 150o a.complishes the highest enha.cement of hea. tra.sfer wherea. the hea. excha.ger with a.bifurca.ion a.gle of 180o ha. the highest pressure drop. The configura.ion with a.pha.= 150o a.hieves higher va.ues of COP compa.ed to the other a.gles. The exergy efficiency improves with Re where the configura.ion with a.pha.= 180o ha. higher exergy efficiency. The contours, strea.lines, a.d vectors of the tempera.ure, velocity, a.d pressure distributions give investiga.ion for the fluid strea. inside the shell a.d tubes.

关键词： Hea. excha.ger Bifurca.ion a.gle Coefficient of performa.ce Constructa. theory

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Sma.t Cities-Ba.ed Improving a.mospheric Pa.ticula.e Ma.ters Prediction Using Chi-Squa.e Fea.ure Selection Methods by Employing Ma.hine Lea.ning Techniques

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a.PLIED a.TIFICIa. INTELLIGENCE 2022年第1期36卷 Article: 2067647页

作者： Menga.h, Ha.a. a.dulla. Hussa.n, La. Ma.goub, Ha.y a.-Qa.a.i, a. Nour, Moha.ed K. marzouk, Ra.wa.Qureshi, Sha.za. a.ma. Hila., a.wer Musta.a Princess Nourah bint Abdulrahman Univ Coll Comp & Informat Sci Dept Informat Syst Riyadh 13100 Saudi Arabia Univ Azad Jammu & Kashmir Dept Comp Sci & Informat Technol Abdullah Campus Muzaffarabad Pakistan Univ Azad Jammu & Kashmir Athmuqam Dept Comp Sci & IT Neelum Campus Azad Kashmir Pakistan King Khalid Univ Coll Sci Art Mahayil Dept Comp Sci Abha Saudi Arabia Menoufia Univ Dept Comp Sci Fac Comp & Informat Menofia Governorat Menoufia Egypt Taibah Univ Coll Comp Sci & Engn Medina Saudi Arabia Umm Al Qura Univ Coll Comp & Informat Syst Dept Comp Sci Mecca Saudi Arabia Pakistan Inst Engn & Appl Sci Dept Comp & Informat Sci Islamabad Pakistan Prince Sattam Bin Abdulaziz Univ Dept Comp & Self Dev Preparatory Year Deanship Al Kharj Saudi Arabia

Pa.ticula.e ma.ter is emitted from diverse sources a.d a.fect the huma. hea.th very ba.ly. Dust pa.ticles exposure from the sta.ed environment ca. a.fect our hea.t a.d lungs very ba.ly. The pa.ticle pollution exposure crea.es a.va.iety of problems including nonfa.a. hea.t a.ta.ks, prema.ure dea.hs in people with lung or hea.t disea.e, a.thma. difficulty in brea.hing, etc. In this a.ticle, we developed a. a.toma.ed tool by computing multimoda. fea.ures to ca.ture the diverse dyna.ics of a.bient pa.ticula.e ma.ter a.d then a.plied the Chi-squa.e fea.ure selection method to a.quire the most releva.t fea.ures. We a.so optimized pa.a.eters of robust ma.hine lea.ning a.gorithms to further improve the prediction performa.ce such a. Decision Tree, SVM with Linea. a.d Regression, Na.ve Ba.es (NB), Ra.dom Forest (RF), Ensemble Cla.sifier, K-Nea.est Neighbor, a.d XGBoost for cla.sifica.ion. The cla.sifica.ion results with a.d without fea.ure selection methods yielded the highest detection performa.ce with ra.dom forest, a.d GBM yielded 100% of a.cura.y a.d a.C. The results revea.ed tha. the proposed methodology is more robust to provide a. efficient system tha. will detect the pa.ticula.e ma.ters a.toma.ica.ly a.d will help the individua.s to improve their lifestyle a.d comfort. The concerned depa.tment ca. monitor the individua.'s hea.thca.e services a.d reduce the morta.ity risk.

关键词： Decision trees

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a.compa.a.ive numerica. study of shell a.d multi-tube hea. excha.ger performa.ce with different ba.fles configura.ions

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INTERNa.IONa. JOURNa. OF THERMa. SCIENCES 2022年 179卷

作者： marzouk, S. a. a.ou a.-Sood, M. M. El-Fa.ha.a.y, Ma.da.K. -Sa.d, Ema. M. S. El Kafr El Sheikh Univ Fac Engn Mech Engn Dept Kafr Al Sheikh Egypt Fayoum Univ Fac Engn Mech Engn Dept Al Fayyum Egypt

This study presents a.numerica. modeling of a.shell a.d tube hea. excha.ger to a.a.yze six va.ious ba.fle con -figura.ions for increa.ing the therma. pa.a.eters performa.ce a.d hydra.lic pa.a.eters performa.ce. The ba.fle configura.ions include conventiona. single segmenta. (CSS), sta.gered single segmenta. (SSS), Flower segmenta. (FS), hybrid segmenta. (HS), circula. ring ba.fle (CR), a.d circula. ring with holes (CRH) ba.fles. Flow of wa.er field cha.a.teristics, pressure loss, a.d hea. tra.sfer performa.ce, including effectiveness (epsilon) a.d the hea. tra.sfer coefficient (h) a.e studied with a.va.ia.ion of Reloa.s numbers from 10500 to 38500 to a.a.yze the best performa.ce. The effectiveness a.d the hea. tra.sfer coefficient increa.e with increa.ing the Reynolds numbers. The HS configura.ion results a.e the la.gest shell side pressure loss while HS a.d CR therma. influence on hea. excha.ger performa.ce a.gmenta.ion is found to be more significa.t compa.ed to other configura.ions for a.l test ca.es. Compa.ed to the CSS a.d SSS ba.fle configura.ions, the dea. spa.es a.d the recircula.ion zones a.e disa.pea.ing in both FS a.d HS configura.ions where the RCH is superior in overcoming the dea. zones completely. The ma.imum va.ues of the effectiveness a.d hea. tra.sfer coefficient of STHX a.e a.hieved in the ca.e of CRH type with enha.cement a.out 166% a.d 142% respectively, compa.ed to CSS ba.fle. The CRH a.complished less friction losses tha. hybrid a.d ring ba.fles where the shell side pressure drop for HS wa. the highest va.ue. The hea. tra.sfer coefficients per pressure loss of the RCH a.e a.out 138% higher tha. tha. of other configura.ions.

关键词： CFD Shell a.d tube hea. excha.ger Ba.fle configura.ions Flow field cha.a.teristics CFD Shell a.d tube hea. excha.ger Ba.fle configura.ions Flow field cha.a.teristics

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