نتایج جستجو برای: 4 parameters (ph

تعداد نتایج: 1934224  

Journal: :علوم 0
محمد اسماعیل عظیم عراقی دانشگاه خوارزمی حمیده اسکندری تربقان hamide eskandari torbaghan باشگاه پژوهشگران جوان

this study presents the electric behavior of sandwich devices based on porous silicon (ps) thin films with au/ps/si/cu structure when the material’s surface is exposed to different gases. ps thin films were fabricated by the electrochemical anodization method of si–c (100) substrates with resistivity 1.4-2.6 ωcm. samples were anodized in a solution of hf (48%), c2h5oh (99.98%) and distilled wat...

Journal: :Hong Kong medical journal = Xianggang yi xue za zhi 2002
W H C Hu N Y H Wong K C Lai W M Hui K F Lam B C Y Wong H H X Xia C K Chan A O O Chan W M Wong K W T Tsang S K Lam

OBJECTIVE To quantify normal proximal and distal oesophageal acid parameters in healthy Chinese. DESIGN Observational study. SETTING University teaching hospital, Hong Kong. SUBJECTS AND METHODS Twenty healthy adults who were not on medication and were free from gastrointestinal symptoms were recruited by advertisement. Ambulatory oesophageal acid (pH<4) exposure parameters were recorded ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه بیرجند - دانشکده کشاورزی 1390

abstract this study is carried out to determine the chemical composition in the three vegetative stages of the haloxylon sp., degradation parameters, with adding naoh and ca(oh2 ). for this purpose, in may and october and january 2010 enough some haloxylon sp. of the ammary area was prepared. crude protein and ash percentage are decrease, neutral detergent fiber percentage with pragress stage ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید بهشتی - دانشکده علوم 1372

a simple, sensitive and selective method for solvent extraction and spectrophotemetric determination of lanthanum (ii) europium (iii), and cerium (iii) is described , the rare earth metals are extracted into chloroform solution of n-phenylbenzohydroxamic acid (pbha) at ph 9-10 various parameters are studied to optimize the extraction conditions. the molar absorptivity is found to increase from ...

2008
Gwang Ha Kim Kyu Chan Huh Yong Chan Lee Kwang Jae Lee Suck Chei Choi Ki Nam Shim Jeong Hwan Kim In Seok Lee Hang Lak Lee Hwoon-Yong Jung Hyo Jin Park

Ambulatory 24-hr esophageal pH monitoring is considered the gold standard for diagnosing gastroesophageal reflux disease. The aim of this study was to establish normal values for gastroesophageal acid exposure in healthy Koreans. Fifty healthy volunteers (24 males and 26 females; mean age, 45 yr) without reflux symptoms and without reflux esophagitis or hiatal hernia on upper endoscopy underwen...

Journal: :international journal of nano dimension 0
a. mirzaee m.sc. student, department of chemistry, ahar branch, islamic azad university, ahar, iran. p. gharbani 2department of chemistry, ahar branch, islamic azad university, ahar, iran.

the present work is focused on the degradation of 4-chloro-2-nitrophenol in aqueous solution containing nano titanium dioxide, hydrogen peroxide and the combination of nano-tio2/h2o2. the effect of experimental parameters, such as the amount of nano- tio2 concentration of h2o2, initial concentration of 4-chloro-2-nitrophenol and ph on the reaction was investigated. experimental data obtained un...

Journal: :Dalton transactions 2006
Jens Geier Heinz Rüegger Hansjörg Grützmacher

The benzophenone dianion [diphenyloxidomethanide, (Ph(2)CO)(2-)], which occurs in the well known deeply violet sodium/benzophenone tetrahydrofuran solutions, was crystallised with sodium cations in form of the two polymeric chain compounds [Na(2)(Ph(2)CO)(tetraglyme)](infinity) and [Na(2)(Ph(2)CO)(thf)(2)](infinity). It was found to aggregate with its conjugated acid, the alcoholate (Ph(2)CHO)(...

1998
Charles A. Nelson Andrew M. Cohen

The standard model(SM) predicts only a gV−A coupling in t → W+b decay. However, if additional Lorentz structures exist, they can manifest themselves in high energy processes such as this via non-SM values of the helicity parameters describing t → W+b. Plots and tables of the values of these helicity parameters are obtained for various coupling strengths. Three phase-type ambiguities are uncover...

Journal: :Pneumonologia i alergologia polska 2014
Aleksandra Rybka Kamila Malesa Olga Radlińska Karolina Krakowiak Elżbieta M Grabczak Marta Dąbrowska Ryszarda Chazan

INTRODUCTION Chronic cough is a common medical complaint, which may deteriorate patients' quality of life and cause many complications. Gastroesophageal reflux disease (GERD) is one of the frequent reasons for chronic cough. Oesophageal pH monitoring is one of the diagnostic methods performed to confirm diagnosis of GERD-related cough. The aim of the study was to analyse the utility of oesophag...

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