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EXPERIMENTAL INVESTIGATION OF THE LOW CYCLE FATIGUE CRACk PROPAGATION IN PC/ABS POLYMER BLENDS

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Acta Mechanica Solida Sinica 2001年第4期14卷 344-348页

作者： Notomi M. kishimoto k. Department of Mechanical Engineering Meiji UniversityKanagawa 214Japan Department of Mechanical and Intelligent Systems Engineering Tokyo Institute of TechnologyTokyo 152Japan

Low cycle fatigue crack propagation (FCP) behavior of two PC/ABSblends with a weight ra- tio of PC to ABS being 80/20 and 60/40,respectively, is investigated. Experiments are carried out by usingstandard compact tension (CT) specimens. The fracture surfaces areexamined with a scanning electron mi- croscope (SEM). It is shownthat the FCP resistance of PC/ABS blend with 20/100 ABS particles ishigher than that of PC/ABS blend with 40/100 ABS particles. It isfound that proper ABS particle content can result in the tougheningof PC/ABS blends through particle cavitation and shear yielding inmatrix.

关键词： polymer blend polycarbonate acrylonitrile-butadiene-styrene fatigue

Concordance between bio-impedance analysis and clinical score in fluid-status assessment of maintenance haemodialysis patients: A single centre experience

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World Journal of Nephrology 2022年第4期11卷 127-138页

作者： kamiti Muchiri Joshua k kayima Elijah N Ogola Seth McLigeyo Sally W Ndung’u Samuel k kabinga Clinical Medicine and Therapeutics University of NairobiNairobi+254Kenya Department of Clinical Medicine and Therapeutics University of NairobiNairobi+254Kenya Department of Public Health University of NairobiNairobi+254Kenya East African kidney Institute University of NairobiNairobi+254Kenya

BACkGROUND The burden of chronic kidney disease(CkD)is rising rapidly *** overload(FO),an independent predictor of mortality in CkD,should be accurately assessed to guide estimation of the volume of fluid to be removed during haemodialysis(HD).Clinical score(CS)and bio-impedance analysis(BIA)have been utilized in assessment of FO and BIA has demonstrated reproducibility and accuracy in determination of fluid status in patients on *** is need to determine the performance of locally-developed CSs in fluid status assessment when evaluated against *** To assess the hydration status of patients on maintenance HD using BIA and a CS,as well as to evaluate the performance of that CS against BIA in fluid status *** This was a single-centre,hospital-based cross-sectional study which recruited adult patients with CkD who were on maintenance HD at kenyatta National *** patients were aged 18 years and above and had been on maintenance HD for at least 3 *** with pacemakers,metallic implants,or bilateral limbs amputations were *** on the patients’clinical history,physical examination,and chest radiograph findings were *** was performed on each of the study participants using the Quantum®II bio-impedance analyser manufactured by RJL Systems together with the BC 4®*** evaluating the performance of the CS,BIA was considered as the gold standard test.A 2-by-2 table of the participants’fluid status at each of the CS values obtained compared to their paired BIA results was constructed(either++,+-,--or-+for FO using the CS and BIA,respectively).The results from this 2-by-2 table were used to compute the sensitivity and specificity of the CS at the various reference points and subsequently plot a receiver operating characteristic(ROC)curve that was used to determine the best cut-off *** above and below the best CS cut-off point as determined by the ROC were classified as being positive and negative for FO

关键词： Bio-impedance analysis Clinical score Chronic kidney disease Maintenance haemodialysis Fluid overload Concordance

The impact of ipsilateral testicular atrophy on semen quality and sperm DNA fragmentation response to varicocele repair

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Asian Journal of Andrology 2021年第2期23卷 146-149页

作者： Parviz k kavoussi Natasha Abdullah Melissa S Gilkey Caitlin Hunn G Luke Machen Shu-Hung Chen keikhosrow M kavoussi Amy Esqueda J David Wininger Shahryar k kavoussi Austin Fertility and Reproductive Medicine/Westlake IVF 300 Beardsley LaneBuilding BSuite 200AustinTX 78746USA

Varicoceles adversely impact semen quality and sperm DNA fragmentation,which typically improve with surgical *** men with varicoceles have ipsilateral testicular atrophy due to damage from the *** study assessed semen quality and the sperm DNA fragmentation index(DFI)response to varicocele repair in men with ipsilateral testicular atrophy(TA)versus men with no testicular atrophy(NTA).Semen parameter values and DFI in both groups were compared preoperatively and *** Mann-Whitney U test and the Wilcoxon signed-rank test were used where *** were 20 men in the TA group and 121 men in the NTA group with no difference in age,varicocele grade,or preoperative semen parameter values between the two *** NTA group had a higher preoperative DFI than the TA *** groups showed improvement in semen quality postoperatively,only the TA group showed a significant improvement in DFI,whereas the NTA group showed significant improvements in several parameter values and *** change from preoperative to postoperative parameter values when comparing the two groups revealed a difference in total sperm motile count and DFI,with a larger mean improvement in the NTA group than in the TA *** TA and NTA groups showed improved semen quality and DFI after varicocele repair,but the NTA group had more improvement than the TA ***,only total motile count(TMC)and DFI had a significantly greater mean change in preoperative to postoperative response in the NTA group than in the TA group.

关键词： spermatozoa testicular atrophy varicocele

Multimodal management of giant cerebral aneurysms: review of literature and case presentation

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Stroke & Vascular Neurology 2020年第1期5卷 22-28页

作者： Jessica k Campos Benjamin Z Ball Barry Cheaney II Alexander J Sweidan Bima J Hasjim Frank P k Hsu Alice S Wang Li-Mei Lin Department of Neurosurgery University of California Irvine Medical CenterOrangeCaliforniaUSA Oregon Health&Science University School of MedicinePortlandOregonUSA Department of Neurology University of California Irvine Medical CenterOrangeCaliforniaUSA Western University of Health Sciences College of Osteopathic Medicine of the PacificPomonaCaliforniaUSA Carondelet Neurological Institute St Joseph’s HospitalCarondelet Health NetworkTucsonArizonaUSA

The pathophysiology of giant cerebral aneurysms renders them difficult to *** in technology have attempted to address any shortcomings associated with open surgery or endovascular *** the introduction of the flow diversion technique,the endovascular approach with flow diversion has become the first-line modality chosen to treat giant aneurysms.A subset of these giant aneurysms may persistent despite any treatment *** the best option for these recurrent and/or persistent giant aneurysms is to employ a multimodal approach-both surgical and endovascular-rather than any single technique to provide a curative result with favourable patient *** paper provides a review of the histopathology and treatment options for giant cerebral ***,an illustrative case is presented to highlight the unique challenges of a curative solution for giant cerebral aneurysms that persist despite initial treatment.

关键词： aneurysm cerebral giant

Synthesis and pharmacological activity evaluation of curcumin derivatives

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Chinese Chemical Letters 2016年第7期27卷 1067-1072页

作者： Jaggi Lal Sushil k.Gupta D.Thavaselvam Dau D.Agarwal School of Studies in Chemistry Jiwaji University Department of Chemistry Dr. K.N. Modi University Microbiology Division Defence Research Development Establishment

Curcumin 3,4-dihydropyrimidinones/thiones/imines have been synthesized using one-pot cyclocondensation of curcumin with substituted aromatic aldehydes and urea/thiourea/guanidine in the presence of chitosamine hydrochloride as a biodegradable and nontoxic catalyst under solvent-free microwave *** synthesized product was purified by crystallization from ethanol and the process does not involve any hazardous *** the synthesized curcumin derivatives 4a-o were screened for antioxidant and anti-inflammatory *** activity data of the synthesized showed that most of the synthesized compounds exhibited greater antioxidant and anti-inflammatory activity than curcumin.

关键词： Curcumin dihydropyrimidinones/thiones/ imines Microwave irradiations Antioxidant capacity Anti-inflammatory activity

A generalized Clifford theorem of semigroups

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Science China Mathematics 2010年第10期53卷 1097-1101页

作者： SHUM k.P. Department of Mathematics The University of Hong Kong

A U-abundant semigroup S in which every H-class of S contains an element in the set of projections U of S is said to be a U-superabundant *** is an analogue of regular semigroups which are unions of groups and an analogue of abundant semigroups which are *** 1941,Clifford proved that a semigroup is a union of groups if and only if it is a semilattice of completely simple *** years later,Fountain generalized this result to the class of superabundant *** this paper,we extend their work to U-superabundant semigroups.

关键词： Clifford theorem unions of groups superabundant semigroups U-abundant semigroups Usuperabundant semigroups

Alternating-Current Transport Properties of the Interface between Nd_(0.7)Sr_(0.3)MnO_(3) Ceramic and a Ag Electrode

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Chinese Physics Letters 2012年第2期29卷 186-189页

作者： CHEN Shun-Sheng YANG Chang-Ping LUO Xiao-Jing Barner k. Medvedeva I.V. Faculty of Physics and Electronic Technology Hubei UniversityWuhan 430062 Faculty of Mathematics and Physics Huangshi Institute of TechnologyHuangshi 435003 Department of Physics University of GöttingenTammanstrasse 1-37077 GöttingenGermany Institute of Metal Physics Ural Division of the Russian Academy of SciencesEkaterinburg 620219Russia State key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004

Electrical transport properties of the interface between a Nd_(0.7)Sr_(0.3)MnO_(3) ceramic and a Ag electrode are investigated using the ac impedance over a wide temperature and frequency *** ac impedance measurements give the compressed semicircle arcs at different temperatures,which are used for the analysis of different contributions to electrical transport based on an electrical equivalent circuit.A significant interface-dependent electroresistance effect of 530% is clearly developed around the metal-insulator transition temperature 130k,which is confirmed as the interface-layer dependent Curie temperature by the plot of interfacial conductance with frequency at different temperatures.

关键词： ceramic interface impedance

Endoscopic pancreatic duct stenting for pain palliation in selected pancreatic cancer patients:a systematic review and meta-analysis

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Gastroenterology Report 2021年第2期9卷 105-114,I0001页

作者： Pradeep k.Siddappa Fadi Hawa Larry J.Prokop MHassan Murad Barham k.Abu Dayyeh Vinay Chandrasekhara Mark D.Topazian Fateh Bazerbachi Division of Gastroenterology and Hepatology Stanford University School of MedicineStanfordCAUSA Department of Internal Medicine St.Joseph Mercy Ann Arbor HospitalYpsilantiMIUSA Library Public Services Mayo ClinicRochesterMNUSA Robert D and Patricia E kern Center for the Science of Health Care Delivery Mayo ClinicRochesterMNUSA Division of Gastroenterology and Hepatology Mayo ClinicRochesterMNUSA Division of Gastroenterology Massachusetts General Hospital and Harvard Medical SchoolBostonMAUSA

Background Abdominal pain is a debilitating symptom affecting-80%of pancreatic cancer(PC)*** duct(PD)decompression has been reported to alleviate this pain,although this practice has not been widely *** aimed to evaluate the role,efficacy,and safety of endoscopic PD decompression for palliation of PC post-prandial obstructive-type *** A systematic review until 7 October 2020 was *** independent reviewers selected studies,extracted data,and assessed the methodological *** We identified 12 publications with a total of 192 patients with PC presenting with abdominal pain,in whom PD decompression was attempted,and was successful in 167 patients(mean age 62.5 years,58.7%males).The use of plastic stents was reported in 159 patients(95.2%).All included studies reported partial or complete improvement in pain levels after PD stenting,with an improvement rate of 93%(95%confidence interval,79%-100%).The mean duration of pain improvement was 94616 *** retrograde cholangiopancreatography(ERCP)-related adverse events(AEs)were postsphincterotomy bleeding(1.8%),post-ERCP pancreatitis(0.6%),and hemosuccus pancreaticus(0.6%).AEs were not reported in two patients who underwent endoscopic ultrasound-guided PD *** the 167 patients with technical success,the stent-migration and stent-occlusion rates were 3.6%and 3.0%,*** AE-related mortality was *** methodological quality assessment showed the majority of the studies having low or unclear *** In this exploratory analysis,endoscopic PD drainage may be an effective and safe option in selected patients for the management of obstructive-type PC ***,a randomized–controlled trial is needed to delineate the role of this invasive practice.

关键词： cancer-associated pain Endoscopic retrograde cholangiopancreatography palliative therapy pancreas cancer systematic review meta-analysis

Hospital resource intensity and cirrhosis mortality in United States

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World Journal of Gastroenterology 2017年第10期23卷 1857-1865页

作者： Amit k Mathur Apurba k Chakrabarti Jessica L Mellinger Michael L Volk Ryan Day Andrew L Singer Winston R Hewitt kunam S Reddy Adyr A Moss Division of Transplant Surgery Department of SurgeryMayo Clinic Arizona Robert D and Patricia E kern Center for the Science of Healthcare Delivery Mayo Clinic Department of Medicine University of Michigan Department of Medicine Loma Linda University

To determine whether hospital characteristics predict cirrhosis mortality and how much variation in mortality is attributable to hospital *** used data from the 2005-2011 Nationwide Inpatient Sample and the American Hospital Association Annual survey to identify hospitalizations for decompensated cirrhosis and corresponding facility characteristics. We created hospital-specific risk and reliability-adjusted odds ratios for cirrhosis mortality, and evaluated patient and facility differences based on hospital performance quintiles. We used hierarchical regression models to determine the effect of these factors on ***-two thousand seven hundred and thirty-three cirrhosis admissions were evaluated in 805 hospitals. Hospital mean cirrhosis annual case volume was 90.4 (range 25-828). Overall hospital cirrhosis mortality rate was 8.00%. Hospital-adjusted odds ratios (aOR) for mortality ranged from 0.48 to 1.89. Patient characteristics varied significantly by hospital aOR for mortality. Length of stay averaged 6.0 ± 1.6 days, and varied significantly by hospital performance (P k-adjusted mortality were higher Medicaid case-mix (OR = 1.00, P = 0.029) and LPN staffing (OR = 1.02, P = 0.015). Higher cirrhosis volume (OR = 0.99, P = 0.025) and liver transplant program status (OR = 0.83, P = 0.026) were significantly associated with survival. After adjusting for patient differences, era, and clustering effects, 15.3% of variation between hospitals was attributable to differences in facility *** characteristics account for a significant proportion of variation in cirrhosis mortality. These findings have several implications for patients, providers, and health care delivery in liver disease care and inpatient health care design.

关键词： Cirrhosis Mortality Hospital variation Resource utilization Quality Outcomes