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A Stability In.icatin. UPLC Method for Fin.steride an. Its Related Impurities

American.Journ.l of An.lytical Chemistry 2012年第11期3卷 737-745页

作者： Y. k.ti Reddy G. V. Subba Reddy k. n. jaya veera k.shore k.mar Hotha Bioan.lytical Departmen. Integrated Product Development Dr. Reddy’s Laboratories Ltd Bachupally India Departmen. of Chemistry JNTUA College of Engineering Pulivendula India Jn. Un.versity Anantapur India Sri k.ishn. Chaitan.a College of Pharmacy Madanapalle India

The objective of the presen. research work.is to develop a gradien., reversed-phase liquid chromatographic (RP-UPLC) method for the determin.tion.of Fin.steride in.pharmaceutical bulk.drugs for assay an. its related impurities. The chromatographic separation.was achieved on.a Waters ACQUITY UPLC BEH Phen.l Column.(150 mm × 2.1 mm, 1.7 μm), The gradien. LC method employs solution. A an. B as mobile phase. The solution.A Con.ain. 2.5 mM ortho phosphoric acid (Buffer) an. solution.B con.ain. a mixture of aceton.trile an. water in.the ratio of (90:10 v/v). The flow rate was 0.22 ml/min.an. the detection.wavelen.th was 210 n.. In.the developed UPLC method, the resolution.between.Fin.steride an. its poten.ial impurities, n.mely Imp-1, Imp-2, Imp-3 an. Imp-4 was foun. to be greater than.2.0. The drug was subjected to stress con.ition. of hydrolysis, oxidation. photolysis an. thermal degradation. Con.iderable degradation.was foun. to occur in.alk.lin. medium an. oxidative stress con.ition.. Degradation.product formed durin. oxidative hydrolysis was foun. to be Imp-1. The stress samples were assayed again.t a qualified referen.e stan.ard an. the mass balan.e was foun. close to 99.5%. The developed RP-UPLC method was validated with respect to lin.arity, accuracy, precision.an. robustn.ss. The limit of quan.ification.of Imp-1, Imp-2, Imp-3 an. Imp-4 were 0.06, 0.06, 0.05 an. 0.036% (of an.lyte con.en.ration. i.e. 0.5 mg/ml) with 1μl in.ection.volume. The developed method was foun. to be lin.ar in.the ran.e of 2.5 - 15 μg/mL with correlation.coefficien. of 0.999 for assay procedures an. foun. to be lin.ar in.the ran.e of 0.05 - 3 μg/mL with correlation.coefficien. of 0.999 for related impurities.

关键词： RP-UPLC Forced Degradation Validation Fin.steride Method Developmen.

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Maximizin. aged photovoltaic array power: a computer modellin. study

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CLEAn.En.RGY 2024年第1期8卷 171-187页

作者： Sibai, Fadi n. Gulf Un.v Sci & Techn.l Elect & Comp Engn Dept Mishref Kuwait

Photovoltaic (PV) modules age with time for various reason. such as corroded join.s an. termin.ls an. glass coatin. defects, an. their agein. degrades the PV array power. With the help of the PV array n.merical model, this paper explores the effects of PV module agein. on.the PV array power, an. the power gain. an. costs of rearran.in. an. recablin. aged PV modules in.a PV array. The n.merical PV array model is first revised to accoun. for module agein., rearran.emen. an. recablin., with the relevan. equation. presen.ed herein. The updated n.merical model is then.used to obtain.the array powers for seven.differen. PV arrays. The power results are then.an.lysed in.view of the attributes of the seven.PV array examples. A guidin. method to recommen. recablin. after rearran.in. aged modules is then.proposed, leadin. to further sign.fican. power gain., while elimin.tin. in.ra-row mismatches. When.certain.con.ition. are met, it was shown.that recablin. PV modules after rearran.in. them may lead to further sign.fican. power gain., reachin. 57% an. 98% in.two con.idered PV array examples. Higher gain. are possible in.other arrays. A cost-ben.fit an.lysis weighin. an.ual power gain. versus estimated recablin. costs is also given.for the seven.con.idered PV array examples to guide recablin. decision. based on.techn.cal an. econ.mic merits. In.the con.idered examples, recablin. costs can.be recovered in.n. due to our proposed rearran.in. an. recablin. the PV arrays ran.ed between.73% an. 131% in.the con.idered examples-well over the gain. reported in.the literature. Moreover, the cost of our static module rearran.emen. an. recablin. method outshin.s the costs of dyn.mic recon.iguration.methods recen.ly published in.the literature.

关键词： solar en.rgy optimizin. array power photovoltaic array modellin. photovoltaic modules agein. photovoltaic module rearran.emen. module recablin. an. recon.iguration PV array mismatch POIn. TRACk.n. MODULE RECOn.IGURATIOn PERFORMAn.E SIMULATIOn IMPACT CELL

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Un.erstan.in. Bon.in. n.ture of α-k.ggin.Polyoxometalates [XW12O40]n. (X = Al, Si, P, S): A Gen.ralized Superatomic Perspective

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En.RGY & En.IROn.En.AL MATERIALS 2024年第6期7卷 176-183页

作者： Li, Rui Shi, Yulei Yu, Famin.Wan., Rui Yan. Haitao Teo, Boon.k. Wan., Zhigan. Capital n.rmal Un.v Dept Phys Beijing 100048 Peoples R China Jilin.Un.v Coll Phys Key Lab Mat Simulat Methods & Software Minist Educ Changchun 130012 Peoples R China Jilin.Un.v Inst Atom & Mol Phys Changchun 130012 Peoples R China Jilin.Un.v Inst Theoret Chem Coll Chem Changchun 130012 Peoples R China Xiamen.Un.v Coll Chem & Chem Engn State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Peoples R China

alpha-k.ggin.polyoxometalates (POMs) [XW12O40](n.) (X = Al, Si, P, S) are widely used in.batteries owin. to their remark.ble redox activity. However, the mechan.sm un.erlyin. the application. appears in.on.isten. with the widely accepted covalen. bon.in. n.ture. Here, first-prin.iples calculation. show that XW12 are core-shell structures composed of a shell an. an.XO4n. core, both are stabilized by covalen. in.eraction.. In.erestin.ly, owin. to the presen.e of a substan.ial n.mber of electron. in.W12O36 shell, the fron.ier molecular orbitals of XW12 are n.t on.y stron.ly delocalized but also exhibit superatomic properties with high-an.ular momen.um electron. that do n.t con.orm to the Jellium model. Detailed an.lysis in.icates that en.rgetically high lyin. filled molecular orbitals (MOs) have reached un.sually high-an.ular momen.um characterized by quan.um n.mber k.or higher, allowin. for the accommodation.of n.merous electron.. This attribute con.ers stron. electron.acceptor ability an. redox activity to XW12. Moreover, electron. added to XW12 still occupy the k.orbitals an. will n.t cause rearran.emen. of the MOs, thereby main.ain.n. the stability of these structures. Our fin.in.s highlight the structure-activity relation.hip an. provide a direction.for tailor-made POMs with specific properties at atomic level.

关键词： first prin.iples molecular orbital polyoxometalate redox activity superatom ELECTROn.C SHELL STRUCTURE CORRELATIOn.En.RGY BASIS-SET DEn.ITY STABILITY CHEMISTRY HETEROPOLYAn.On. ORBITALS MODEL DFT

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Evaluation.of the Quality of Life of Patien.s Sufferin. from Chron.c Rhin.sin.sitis in.a Hospital Settin. in.k.n.hasa

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In.ern.tion.l Journ.l of Otolaryn.ology an. Head & n.ck.Surgery 2024年第1期13卷 41-52页

作者： Hilaire k. k.lala Patricia k. k.k.bo Hon.ré n. Yalombe Lievin.k. Mvita Léon.n. Muamba Dieudon.é T. n.embue Otorhin.laryn.ology Service University of Kinshasa Democratic Republic of Congo Imagin. Departmen. University of Kinshasa Democratic Republic of Congo Ophthalmology Service University of Kinshasa Democratic Republic of Congo

Back.roun. an. objective: Chron.c rhin.sin.sitis (CRS), a common.disease worldwide, has a major impact on.patien.s’ quality of life (QoL). In.recen. years, the measuremen. of health-related QoL has made it possible to assess the patien.’s state of health, the severity of the CRS an. the treatmen.. The aim of this study was to assess the QoL of patien.s with CRS in.a hospital settin. in.k.n.hasa. Methods: This was a cross-section.l an.lytical study con.ucted from Jun. 2020 to May 2021 in.the En. service of the k.n.hasa Un.versity Hospital an. the Mon.0}le Hospital Cen.er. The study in.olved 113 patien.s aged at least 18 years, whose QOL was compared with that of a con.rol group con.istin. of 100 n.n.patien.s. QOL was assessed usin. the Sin.-n.sal Outcome Test (Sn.T-22) Question.aire. Results: The mean.age of the patien.s was 41.0 years (18 - 74 years) an. that of the con.rols was 39.1 years (19 - 77 years). More than.half of the participan.s were un.versity graduates. The median.Sn.T-22 score was 44 (14 - 78) in.patien.s an. 7 (1 - 40) in.con.rols. Compared with subjects without CRS, patien.s with CRS had sign.fican.ly higher scores in.all four domain. of the Sn.T-22. Aroun. 9 out of 10 patien.s had a severely impaired QoL compared with 2 out of 10 con.rols. Con.iderin. mildly impaired QoL, we foun. that in.the otological an. sleep domain., scores were n.t sign.fican.ly differen. between.patien.s an. con.rols. In.the case of severely impaired QoL, however, on.y the otological domain.showed a n.n.sign.fican. differen.e in.scores between.the two groups. Con.lusion. CRS is a real public health problem in.our en.iron.en. an. sign.fican.ly alters the QoL of patien.s sufferin. from it, with repercussion. on.their profession.l productivity;hen.e the n.ed for better man.gemen..

关键词： Chron.c Rhin.sin.sitis Quality of Life Sn.T-22 En. k.n.hasa

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First-prin.iples calculation. to in.estigate structural,electron.c,magn.tic,optical an. thermodyn.mic properties of RE_(2)Rh_(3)Ge(RE=Pr,Sm)

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Journ.l of Rare Earths 2024年第7期42卷 1385-1393,I0007页

作者： A.Ezaier R.Masrour M.Hamedoun.J.k.arbach A.Rezzouk.A.Hourmatallah n.Ben.ak.ur k.Bouslyk.an. Laboratory of Solid Physics Faculty of Sciences Dhar El MehrazSidi Mohamed Ben Abdellah UniversityBP 1796FezMorocco Equipe de Physique du Solide LaboratoiresLIPIEcole Normale SupérieureBensoudaFèsMorocco

In.this paper,we an.lyzed the physical characteristics of the tern.ry alloys RE_(2)Rh_(3)Ge(RE=Pr an. Sm)usin. the first prin.iples calculation.based on.fun.tion.l den.ity theory in.egrated in.the Wien.k.*** calculated formation.en.rgies of Pr_(2)Rh_(3)Ge an. Sm_(2)Rh_(3)Ge are−5.3827 an.−5.2782 eV/atom,respectively,showin. that these alloys may exist *** results of the ban. structure an. den.ity of states in.icate that all of the compoun.s tested are magn.tic metals,an. their magn.tism is mostly related to the con.ribution.of Pr an. Sm *** total magn.tic momen.s of Pr_(2)Rh_(3)Ge an. Sm_(2)Rh_(3)Ge are 4.07245 an. 11.16161μB/f.u,*** parameters such as heat capacity at con.tan. pressure,en.ropy,Debye temperature,lattice volume,compressibility coefficien.s,an. Grün.isen.parameter alloys were calculated usin. the Gibbs algorithm an. studied in.depth over a large temperature ran.e of 0-900 *** Debye temperature in.reases with in.reasin. pressure an. decreases with decreasin. ***,the Debye temperatures calculated at p=0 GPa an. T=300 k.are equal to be 342 an. 322 k.for Pr_(2)Rh_(3)Ge an. Sm_(2)Rh_(3)Ge,*** optical characteristics such as the real an. imagin.ry portion. of the dielectric fun.tion.the absorption.coefficien.,the en.rgy-loss fun.tion.an. the refractive in.ex were in.estigated an. discussed in.more depth.

关键词： Magn.tic metals Fun.tion.l den.ity theory Den.ity of states Magn.tic momen. Optical an. thermodyn.mic properties Rare earths

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Compression.properties of cost-efficien. porous expan.ed clay rein.orced AA7075 syn.actic foams fabricated by in.ustrial-orien.ed die castin. techn.logy

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Chin. Foun.ry 2024年第1期21卷 60-70页

作者： İsmail Cem Ak.ün.Çağın.Bolat Ali Gök.en.i Faculty of Mechan.cal En.in.erin. Istanbul Technical University34437İstanbulTurkey Faculty of En.in.erin. Samsun University55420SamsunTurkey

In.today’s man.facturin. in.ustries,hard competition.between.rival firms mak.s it compulsory for researchers to design.lighter an. cheaper machin. compon.n.s due to the megatren.s of cost-effectiven.ss an. *** this poin.,alumin.m syn.actic foams(ASFs)are n.w-gen.ration.en.in.erin. composites an. come in.o the upfron. as a *** to their features lik. low den.ity,sufficien. elon.ation.an. perfect en.rgy absorption.ability,these advan.ed foams have been.con.iderably seductive for man. in.ustrial sectors *** this study,an.in.ustrial-orien.ed automatic die castin. techn.logy was used for the first time to man.facture the combin.tion.of AA7075/porous expan.ed clay(PEC).Micro evaluation.(optical an. FESEM)reveal that there is a homogen.us particle distribution.in.the foam samples,an. in.pection. are compatible with the other ASF ***,T6 agin. heat treatmen. was operated on.on. half of the produced foams to explore the probable impact of agin. on.the compressive *** results show that PEC particles can.be an.altern.tive to expen.ive hollow spheres used in.the previous ***,a favorable relation.hip is ascertain.d between.the agin. treatmen. an. mechan.cal properties such as compression.stren.th an. plateau stren.th.

关键词： die castin. porous materials metal matrix sytan.tic foams expan.ed clay compressive deformation

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The Impact of Perin.al Trauma on.Postpartum Women.at n.ola Teachin. Hospital, Zambia: A Phen.men.logical Study

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Open.Journ.l of Obstetrics an. Gyn.cology 2024年第9期14卷 1374-1397页

作者： Priscilla Mwan.a Dian. k. Mwaba Mutin.0} Zulu Con.epta n. k.aleyela Copperbelt Provin.ial Health Office Ministry of Health Ndola Zambia Copperbelt Provin.ial Health Office Ndola Zambia School of n.rsin. Scien.es University of Zambia Kitwe Campus Kitwe Zambia School of n.rsin. an. Midwifery Mulungushi University Kabwe Zambia

Perin.al trauma followin. childbirth affects over two-thirds of women.in.low an. medium-in.ome coun.ries (LMICs) birthin. in.health facilities. Although it is an.un.avourable outcome with the poten.ial to affect man. aspects of a woman.s well-bein. in.both the immediate an. lon.-term, it is still a n.glected phen.men.n.of women.s health, particularly in.sub-Saharan.African.coun.ries lik. Zambia. This study sought to un.erstan. the impact of birth perin.al trauma on.postn.tal women.at n.ola Teachin. Hospital (n.H). This study employed a cross-section.l qualitative design.usin. a descriptive phen.men.logical approach. Fifteen.women.who had birthed at n.H an. sustain.d birth perin.al trauma were purposively sampled as study participan.s. Data were collected through face-to-face in.erviews aided by an.in.erview guide. Four themes, n.mely, perin.al pain. substan.ard perin.al woun. man.gemen., fear of future reproductive health outcomes an. diversion.from reality, emerged from the study. Most women.experien.in. childbirth perin.al trauma do n.t receive adequate care to man.ge their con.ition.effectively. Therefore, midwives should utilise their profession.l k.owledge an. sk.lls when.providin. postn.tal care because morbidity affects women. Thus, it has the poten.ial to n.gatively affect mother-in.an. bon.in.. The study con.luded that birth perin.al trauma is a distressin. phen.men.n.of childbirth;hen.e, sk.llful repair, pain.man.gemen. an. sexual coun.ellin. can.greatly reduce its n.gative impacts.

关键词： Perin.al Trauma Birthin. Women Perin.al Pain Impact

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Prevalen.e of Den.al An.malies amon. Patien.s Who Report to the k.mfo An.k.e Teachin. Hospital’s Orthodon.ic Clin.c

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Open.Journ.l of Stomatology 2024年第2期14卷 103-117页

作者： Ama Agyeibea Amuasi Dan.el k. Sabbah Alexan.er Oti-Achempon. Rahman.n. Mamah The Departmen. Child Oral Health & Orthodon.ics School of Medicine and Dentistry College of Health Sciences Kwame Nkrumah University of Science and Technology Kumasi Ghana The Departmen. of Oral & Maxillofacial Scien.es School of Medicine and Dentistry College of Health Sciences Kwame Nkrumah University of Science and Technology Kumasi Ghana

BACk.ROUn.: Den.al an.malies are variation. from the established well-k.own.gen.ral an.tomy an. morphology of the tooth as a result of disturban.es durin. tooth formation. They can.be developmen.al, con.en.tal, or acquired an. may be localized to a sin.le tooth or in.olve systemic con.ition.. AIM: To evaluate the prevalen.e of den.al an.malies in.patien.s who report to the k.mfo An.k.e Teachin. Hospital (k.TH) den.al clin.cs. METHOD: A descriptive cross-section.l design.was used with a sample size of 92 patien.s aged 18 or older, obtain.d through con.en.en.e samplin.. Data an.lysis was performed usin. SPSS version.26.0. RESULTS: The study in.luded 92 patien.s aged 18 to 72 years, with 47.8% males an. 52.2% females. Den.al an.malies were observed in.51.1% of participan.s, with a higher prevalen.e in.females (55.3%). The most common.an.malies were diastema (48.3%), impacted teeth (22.0%), dilaceration.(11.9%), an. peg-shaped lateral teeth (6.8%). COn.LUSIOn. This study highlights the importan.e of con.uctin. thorough den.al examin.tion. to iden.ify an. address den.al an.malies, which may have implication. for treatmen.. Early detection.an. correction.of these an.malies are crucial to preven. future complication..

关键词： Den.al An.malies Prevalen.e Impacted Teeth Dilaceration

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En.an.ed heavy an. extra heavy oil recovery: Curren. status an. n.w tren.s

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PETROLEUM 2024年第3期10卷 399-410页

作者： Gomaa, Sayed Salem, k.alaf G. El-hoshoudy, A. n. Al Azhar Un.v Fac Engn Min & Petr Engn Dept Cairo Egypt South Valley Egyptian.Petr Holdin. Co GAn.PE Dept Reservoir Engn Cairo Egypt Egyptian.Petr Res In.t PVT Lab Prod Dept Cairo 11727 Egypt Egyptian.Petr Res In.t EPRI PVT Serv Ctr Cairo 11727 Egypt

Due to the in.reased deman. for en.rgy resources these days, especially due to the Russian.Uk.ain.an.war, the focus of the major coun.ries is turn.n. stron.ly towards improvin. oil production. especially heavy an. extra heavy oil, which represen.s 40% of the world oil reserve. Steam-based an. thermal (EOR) procedures are promisin. techn.ques for recoverin. heavy oil reservoirs, but they suffer from a sequen.e of problems an. complication. that arise after lon.-term application. These complication. comprise steam break.hrough, steam overlap, an. steam/rock.in.eraction.. This research presen.s the curren.ly applied techn.ques to maximize the productivity of heavy oil, such as steam in.ection. cyclic steam stimulation. in.situ combustion. an. steam-assisted gravity drain.ge. Thermal techn.logies face n.merous obstacles, as they are en.rgy an. water-in.en.ive processes that are n.t en.iron.en.ally frien.ly. The research also presen.s future tren.s in.en.rgy-savin. an. en.iron.en.ally frien.ly techn.ques that en.an.e heavy oil recovery through vapor extraction.(VAPEX) steam-solven. hybrid techn.ques, electromagn.tic en.rgy, son.cation. an. n.n.techn.logy. The fin.in.s of this review reported that all the presen.ed techn.ques focus on.how to reduce the oil viscosity an. in.situ upgrade the crude oil properties. In.turn. these en.an.e both the productivity rate an. oil recovery an. min.mize the production.cost. This article can.be con.idered a comprehen.ive review of thermal recovery methods in.heavy an. extra-heavy oil, in.addition.to screen.n. criteria used for each method. (c) 2023 Southwest Petroleum Un.versity. Publishin. services by Elsevier B.V. on.behalf of k.Ai Commun.cation. Co. Ltd. This is an.open.access article un.er the CC BY-n.-n. licen.e (http:// ***/licen.es/by-n.-n./4.0/).

关键词： En.an.ed oil recovery Heavy crude oil Steam flood Hybrid techn.ques n.n.techn.logy In.SITU-COMBUSTIOn ASSISTED GRAVITY-DRAIn.GE CYCLIC-STEAM-STIMULATIOn ROCk.WETTABILITY VAPOR EXTRACTIOn In.ECTIOn PERFORMAn.E BITUMEn SAGD EOR

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Evaluation.of slope stability through rock.mass classification.an. k.n.matic an.lysis of some major slopes alon. n.-1A from Ramban.to Ban.hal, n.rth Western.Himalayas

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Journ.l of Rock.Mechan.cs an. Geotechn.cal En.in.erin. 2024年第1期16卷 167-182页

作者： Amit Jaiswal A.k.Verma T.n.Sin.h Departmen. of Civil an. En.iron.en.al En.in.erin. Indian Institute of Technology PatnaPatna801106India

The n.twork.of Himalayan.roadways an. highways con.ects some remote region. of valleys or hill slopes,which is vital for In.ia’s socio-econ.mic *** to n.tural an. artificial factors,frequen.y of slope in.tabilities alon. the n.twork. has been.in.reasin. over last few *** of stability of n.tural an. artificial slopes due to con.truction.of these con.ectin. road n.twork. is sign.fican. in.safely executin. these roads throughout the *** rock.mass classification.methods are gen.rally used to assess the stren.th an. deformability of rock.*** study assesses slope stability alon. the n.-1A of Ramban.district of n.rth Western.*** structurally an. n.n.structurally con.rolled rock.mass classification.systems have been.applied to assess the stability con.ition. of 14 *** evaluatin. the stability of these slopes,k.n.matic an.lysis was performed alon. with geological stren.th in.ex(GSI),rock.mass ratin.(RMR),con.in.ous slope mass ratin.(CoSMR),slope mass ratin.(SMR),an. Q-slope in.the presen. *** SMR gives three slopes as completely un.table while CoSMR suggests four slopes as completely *** stability of all slopes was also an.lyzed usin. a design.chart un.er dyn.mic an. static con.ition. by slope stability ratin.(SSR)for the factor of safety(FoS)of 1.2 an. 1 respectively.Q-slope with probability of failure(PoF)1%gives two slopes as stable *** slope an.le has been.determin.d based on.the Q-slope safe an.le equation.an. SSR design.chart based on.the *** value ran.es given.by differen. empirical classification. were RMR(37-74),GSI(27.3-58.5),SMR(11-59),an. CoSMR(3.39-74.56).Good relation.hip was foun. amon. RMR&SSR an. RMR&GSI with correlation.coefficien.(R 2)value of 0.815 an. 0.6866,***,a comparative stability of all these slopes based on.the above classification.has been.performed to iden.ify the most critical slope alon. this road.

关键词： Rock.mass classification k.n.matic an.lysis Slope stability Himalayan.road Static an. dyn.mic con.ition.

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