检索结果-南通市图书馆

Preparation and Characterization of Multilayered Al/Fe-Mo-Si-B Alloy with Nanostructure

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

Journal of Materials Science & Technology 1996年第2期12卷 114-118页

作者： Yao, B gong, J geng, YZ Min, CZ Xing, ZM Wang, am Ding, BZ Hu, ZQ CHINESE ACAD SCI INST MET RESNATL KEY LAB RSASHENYANG 110015PEOPLES R CHINA

The bulk multilayered Al/Fe-Mo-Si-B alloy with nanostructure was prepared by annealing the alternate layers consisting of metal Al and amorphous (Fe-0.99,Mo-0.01)(78)Si9B13 alloy ribbons for 30 min at 873 K under pressure of 3 similar to 5.5 gPa. The structures and grain sizes of the Fe-Mo Si-B nanocrystalline alloy were measured and analyzed. It was found that the pressure could restrain the growth of the grains and influence the formation of phases. The dependence of grain sizes for alpha-Fe(Mo,Si) and Fe2B on pressure was given. The morphologies of Al/Fe-Mo-Si-B nanocrystalline alloy interfaces were observed by SEM. Two interfacial phases formed at various pressures were established by TEM and EDAX, and an unknown Fe-rich one with nanostructure was also observed. The dependence of the interfacial phases on pressure and its formation and growth mechanism were discussed.

关键词： Nanostructured materials

Computer modelling and analysis of the photodegradation effect in a-Si:H p–i–n solar cell

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

Journal of Semiconductors 2015年第1期36卷 52-59页

作者： A.F Bouhdjar L.Ayat am.Meftah N.Sengouga AF.Meftah Faculté des Sciences Laboratoire des Matériaux Semi-conducteurs et Métalliques Université Mohammed Khider B.P. 145Biskra 07000 Algérie Laboratory of Semiconductor Devices Physics Physics Department University of Béchar P.O. Box 417 Béchar 08000Algeria

Using a previous model, which was developed to describe the light-induced creation of the defect density in the a-Si：H gap states, we present in this work a numerical modelling of the photodegradation effect in the a-Si：H p–i–n solar cell under continuous illumination. We first considered the simple case of a monochromatic light beam with a wavelength λ between 530–540 nm non uniformly absorbed, then the global standard solar spectrum（am1.5） illumination is taken into account. The photodegradation is analysed on the basis of the resulting changes in the free carrier＇s densities, recombination rate, band structure, electrical potential and field, space charge, and current densities. Changes in the cell＇s external parameters： the open circuit voltage Voc, the short circuit current density Jsc, the fill factor FF and the maximum power density Pmaxare also presented.

关键词： a-Si:H Staebler–Wronski effect p–i–n

Optimal culture conditions and toxicity assessment of Fomitopsis feei(Fr.):a newly documented macro fungus from Philippines

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

Studies in Fungi 2020年第1期5卷 491-507页

作者： De Leon am Dulay AR Villanueva AL Kalaw SP Department of Biological Sciences College of ScienceCentral Luzon State UniversityScience City of MuñozNueva EcijaPhilippines Center for Tropical Mushroom Research and Development Central Luzon State UniversityScience City of MuñozNueva EcijaPhilippines

Mushrooms are known to be utilized by ethnic communities and Paracelis,Mountain Province is one of the places in Philippines inhabited by several of these native *** studies have been conducted on various macrofungi,however no studies have been reported about Fomitopsis feei in the Philippines particularly in Paracelis,Mountain *** is a brown-rot bracket fungus,belonging to the family Fomitopsidaceae,characterized by a sessile effuse-reflexed basidiomata,with its color ranging from white to pinkish or *** mushroom has been reported to have antimicrobial properties,hence optimization of its culture condition could lead to its mass production for its biopharmaceutical *** order to develop a mass cultivation protocol of this mushroom,this study was conducted to determine the optimum conditions for its mycelial *** effect of different culture media using local substrates and evaluating environmental factors such as pH,aeration,illumination,and temperature were *** conditions for the secondary mycelial growth of *** produced very thick and largest radial growth on coconut water gelatin(CWg)medium(83.57 mm)at pH 6.5(83.13 mm),in sealed(85 mm),dark conditions(85.00 mm)at room temperature(28-32℃)(81.96 mm).The most abundant mycelial growth was found in cracked corn as grain spawning *** study also determined the teratogenic and cytotoxic activity of the ethanol extract of *** against the zebra fish(Danio rerio)embryos and brine shrimp(Artemia salina)*** feei exhibited teratogenic effects against the developing *** embryos wherein growth retardation,malformation of tail,yolk deformity,pericardial edema,curved body,scoliosis and little pigmentation were the notable teratogenic effects of the ethanol extract to the developing *** treated with≥1000 ppm recorded high mortality *** was most evident at lower concentrations≤750 *** terms of heartbeat,as the concentrat

关键词： cultivation cytotoxicity grain spawn local substrate media teratogenicity

gastroesophageal reflux disease and non-esophageal cancer

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 Journal of gastroenterology 2015年第3期21卷 815-819页

作者： Fernando am Herbella Sebastiao Pannocchia Neto Ilka Lopes Santoro Licia Caldas Figueiredo Department of Surgery Federal University of Sao PauloSao Paulo 04037-003Brazil Pneumology Division Department of MedicineFederal University of Sao PauloSao Paulo 04037-003Brazil

The association of gastroesophageal reflux disease(gERD) and esophageal cancer is well *** carcinogenic properties of the gastroduodenal contents may also lead to cancer in target organs for gERD especially considering that they do not have intrinsic protective mechanisms as found in the *** review focuses on the putative relation between gERD and non-esophageal *** of the papers reviewed are far from ideal to prove the relationship of extraesophageal cancer and gERD since a small number ofpatients is presented,most do not control cases based on tobacco usage and obesity,and the diagnosis of gERD is variable,not always from an objective measurement such as p H monitoring but relying on symptoms in most ***,head and neck and lung cancer have a growing incidence parallel to gERD and a shift towards non-smoking,female gender and adenocarcinoma(compared to squamous cell carcinoma) is arising,similar to the example of esophageal cancer with the exception of the female gender.

关键词： gastroesophageal reflux Cancer Pharynx Larynx Trachea Lung

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

某些多项式乘积值中的完满平方

数学译林 2021年第2期40卷 184-185页

作者： Erhan gürel 陆柱家(译) 童欣(校) 不详

我们证明,多项式P(k)=4k^(4)+1的前n个相继值的乘积有无穷多次是完满平方,而多项式Q(k)=k^(4)+4的前n个相继值的乘积只有当n=2时才是一个完满平方.

关键词：多项式乘积平方完满无穷

relationship between MODIS-NDVI data and wheat yield: A case study in Northern Buenos Aires province, Argentina

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Information Processing in Agriculture 2015年第2期2卷 73-84页

作者： Mariano F.Lopresti Carlos M.Di Bella américo J.Degioanni Instituto Nacional de Tecnología Agropecuaria(INTA) EEA PergaminoRuta 32 km 4.5Pergamino 2700Buenos AiresArgentina INTA-Castelar CNIAInstituto de Clima y AguaLas Cabanas y Los Reseros S/NHurlingham 1686Buenos AiresArgentina UNRC Facultad de Agronomía y VeterinariaDepartamento de Ecología AgrariaRuta Nacional 36 km 601Río Cuarto 5800Co´rdobaArgentina CONICET–Consejo Nacional de Investigaciones Científicas y Técnicas Argentina

In countries like Argentina,whose economy depends heavily on crop production,the estimation of harvests is an elementary *** providing objectivity,the use of remote sensing allows estimating yield in *** the time of maximum leaf area in wheat corresponds with the critical period of the crop,a good relationship is expected between the Normalized Difference Vegetation Index(NDVI)and *** present study was carried out in the North of Buenos Aires province,*** on the type of soil,the study area can be divided into two homogeneous subzones:a subzone with lower clay content in the southwestand a subzone with higher clay content in the *** growing seasons(2003–2011)were *** the first five years,an empirical model was calibrated and validated with field-observed wheat yields and MOD13q1 product-NDVI data,whereas in the other four years,the calibrated model was applied by means of yield maps and by comparing with official *** MOD13q1 image corresponding to Julian day 289 showed the best fit between NDVI and yield to estimate wheat yield *** yield maps,better weather conditions showedhigher yields and higher soil productivity presented a greater proportion of the area occupied by higher *** department level,an R2 value of 0.75 was found after relating the estimation of the calibrated empirical model with official *** method used allows predicting wheat yield 30 days before *** yield maps,the NDVI perceived the temporal and spatial variability in the study area.

关键词： Remote sensing Wheat NDVI Yield Empirical models MODIS

Botulinum toxin injections after surgery for Hirschsprung disease:Systematic review and meta-analysis

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 Journal of gastroenterology 2019年第25期25卷 3268-3280页

作者： Danielle Roorda Zarah am Abeln Jaap Oosterlaan Lodewijk WE van Heurn Joep PM Derikx Department of Pediatric Surgery Emma Children’s HospitalAmsterdam UMCUniversity of Amsterdam and Vrije Universiteit AmsterdamAmsterdam Reproduction and DevelopmentAmsterdam 1105 AZNetherlands Department of Pediatrics Emma Children’s HospitalAmsterdam UMCUniversity of AmsterdamEmma Neuroscience GroupAmsterdam Reproduction and DevelopmentAmsterdam 1105 AZNetherlands Department of Pediatric Surgery Emma Children’s HospitalAmsterdam UMCUniversity of Amsterdam and Vrije Universiteit AmsterdamAmsterdam Gastroenterology and MetabolismAmsterdam 1105 AZNetherlands

BACKgROUND A large proportion of patients with Hirschsprung disease experience persistent obstructive symptoms after corrective *** obstructive symptoms may result in faecal stasis that can develop into Hirschsprung-associated enterocolitis,a potential life-threatening *** treatment to improve faecal passage is internal anal sphincter relaxation using botulinum toxin *** To give an overview of all empirical evidence on the effectiveness of botulinum toxin injections in patients with Hirschsprung *** A systematic review and meta-analysis was done by searching PubMed,EMBASE and the Cochrane Library,using entry terms related to:(1)Hirschsprung disease;and(2)Botulinum toxin injections.14 studies representing 278 patients met eligibility *** that were extracted were proportion of patients with improvement of obstructive symptoms or less enterocolitis after injection,proportion of patients with adverse effects and data on type botulinum toxin,mean dose,average age at first injection and patients with associated ***-effects meta-analysis was used to aggregate effects and random-effects meta-regression was used to test for possible confounding *** Botulinum toxin injections are effective in treating obstructive symptoms in on average 66%of patients[event rate(ER)=0.66,P=0.004,I2=49.5,n=278 patients].Type of botulinum toxin,average dose,average age at first injections and proportion of patients with associated syndromes were not predictive for this *** 7 duration of improvement after one botulinum toxin injections was 6.4 mo and patients needed on average 2.6 *** was a significant higher response rate within one month after botulinum toxin injections compared to more than one month after Botulinum toxin injections(ER=0.79,vs ER=0.46,Q=19.37,Pg enterocolitis(ER 0.58,P=0.65,I2=71.0,n=52 patients).There wer

关键词： Hirschsprung disease Botulinum toxin Internal anal sphincter Obstructive symptoms Enterocolitis Adverse effects

Prognostic significance of peritoneal metastasis from colorectal cancer treated with first-line triplet chemotherapy

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 Journal of Clinical Cases 2022年第8期10卷 2429-2438页

作者： Shouki Bazarbashi Abdulrahman Alghabban Mohamed Aseafan Ali H Aljubran Ahmed Alzahrani Tusneem am Elhassan Oncology Center King Faisal Specialist Hospital&Research CenterRiyadh 11211RiyadhSaudi Arabia

BACKgROUND Peritoneal metastasis from colorectal cancer(CRC)carries a poor prognosis in most *** majority of those studies used either a single-agent or doublet chemotherapy regimen in the first-line *** To investigate the prognostic significance of peritoneal metastasis in a cohort of patients treated with triplet chemotherapy in the first-line *** We retrospectively evaluated progression-free survival(PFS)and overall survival(OS)in 51 patients with metastatic CRC treated in a prospective clinical trial with capecitabine,oxaliplatin,irinotecan,and bevacizumab in the first-line setting according to the presence and absence of peritoneal ***,univariate and multivariate analyses for PFS and OS were performed to assess the prognostic significance of peritoneal metastasis at the multivariate *** Fifty-one patients were treated with the above triplet *** had peritoneal *** patient characteristics of both groups showed a significant difference in the sidedness of the primary tumor(left-sided primary tumor in 60%of the peritoneal group vs 86%in the nonperitoneal group,P=0.03)and the presence of liver metastasis(40%for the peritoneal group vs 75%for the nonperitoneal group,P=0.01).Univariate analysis for PFS showed a statistically significant difference for age less than 65 years(P=0.034),presence of liver metastasis(P=0.046),lung metastasis(P=0.011),and those who underwent metastasectomy(P=0.001).Only liver metastasis and metastasectomy were statistically significant for OS,with P values of 0.001 and 0.002,*** analysis showed that age(less than 65 years)and metastasectomy were statistically significant for PFS,with P values of 0.002 and 0.001,*** the other hand,the absence of liver metastasis and metastasectomy were statistically significant for OS,with P values of 0.003 and 0.005,*** Peritoneal metastasis in patients with metastatic CRC tre

关键词： Colorectal cancer Peritoneal carcinomatosis Triplet chemotherapy Survival Prognostic factors Metastasectomy

Colorectal cancer and pollution

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 Journal of gastroenterology 2010年第28期16卷 3475-3477页

作者： am El-Tawil Department of Surgery University Hospital of Birmingham

The incidence of colorectal carcinoma is increasing in young patients, in contrast to the well established wisdom that it is exclusively diagnosed in patients older than 40 years. In this survey, we examined all possible risk factors, and we recommend a number of measures for early detection in young patients who are at risk of developing this malignant tumor.

关键词： Colorectal adenocarcinoma Food contamination Pesticides Young patients Free radicals