The Influence of Colour on Learning in University Libraries

This study investigated how colour can influence learning in university libraries. The main aim was to identify the impact of colour on learning performance by exploring the effect of colour on learners’ emotions and heart rate within individual study areas. Three studies were conducted to achieve the objectives. Action research was used as a methodology. To enrich the findings, this study utilises different mixed methods (qualitative and quantitative) including experiments, focus groups, questionnaire and interviews

Preserve the Perverse: Naughty Words in the Nahdah

In this thesis, I closely analyze Ahmad Faris al-Shidyaq’s use of enumeration in al-Saq ‘ala al-Saq (1855). Al-Shidyaq uses enumerations and lists throughout al-Saq to thwart power structures spanning religious, political, colonial, literary, and sectarian domains in mid-nineteenth-century Syro-Lebanon. The Arabic language’s capacity to render new subjectivities, power dynamics, and capitalist relations legible made it a charged site of debate and reform in the nineteenth century because of its centrality to questions of Arab identity. While al-Shidyaq’s al-Saq powerfully demonstrates this in several ways, my focus is on the critical role of lists and enumerations, which are especially valuable and revelatory for several reasons, including (1) their interruptive and “excessive” operations and profane content that aims to neutralize and resist authoritative order, particularly religious authorities seeking to sanction taboos as themselves “excessive”; (3) their sonic engagement with the carnal characteristic of al-Saq; (4) their testament to the emergence of print technologies which effected a new macrotypography and forms of textual presentation in Arabic books. I examine al-Shidyaq’s use of lists and enumerations within the broader Nahdawi context to unpack their polemical functions and underlying mechanisms as critiques of dominant power structures. To provide a theoretical framework for this analysis, I employ monster theory and Bakhtinian theory (the carnivalesque, grotesque, heteroglossia, and polyphony) to argue that al-Saq is a disruptive and subversive text that challenges the orthodoxies of language and society alike

Spectrophotometric micro determination of drug promethazine hydrochloride in some pharmaceutical by chelating with Rhodium

The drug promethazine hydrochloride (PRZH) forms with rhodium (II) a colored chelate (?max = 472 nm) complex at (pH = 2.1) which is extractable with benzyl alcohol as organic solvent. Under the appropriate experimental conditions a calibration plot was set up from which some analytical parameter were derived and deduced by regression. Standard addition procedure was also adopted. It has been estimated that the concentration of the drug PRZH to be 24.89 mg per unit and 24.19 mg per unit for both calibrations. Under optimal conditions, the developed method has been achieved the following characteristics: LDR (30 – 150 µg ml-1 ) PRZH , RSD % ( 0.6 – 2.47 ) , sandell sensitivity( 0.0844 µg. cm -2 ) , LOD ( 1.66 µgml-1 ) , recovery % ( 100.74 ± 1.34 ) , Erel % ( 0.74 ) . Stability constant (6.4 × 10 5 M-1). The mole – ratio method (1: 1) approved that PRZH – Rh (II) as a structure of the complex. The developed procedure has been adapted to analyze PRZH in various pharmaceuticals

Determination of Desferrioxamine in the Drug Desferal™ as DFOM-Au (III) Complex by Using Indirect Electrothermal Atomic Absorption Spectrometry and Other Techniques.

استحدث طريقة تحليلية غير مباشرة لتعيين المادة الفعالة الدسفيروكسامين في دواء الدسفرال من خلال تفاعل هذا المركب مع عنصر الذهب الثلاثي لتكون معقد مخلبي يجري استخلاصه بمذيب رابع كلوريد الكربون وحقن حجم معيين من هذا المستخلص في الفرن الغرافيتي المطلي بكربيد الزركونيوم . جرى دراسة معرفة تكوين وتركيب المعقد DFOM-Au(III)) بالتقنيات المعروفة مثل مطيافية الاشعة تحت الحمراء ومطيافية الاشعة الفوبنفسجية-المرئية وتبين ان النسبة المولية للعضيدة-الفلز هي 1:1. لقد تم دراسة العوامل التجربية التي تؤثر على تكوين هذا المعقد من خلال حساب الممتصية الذرية بالفرن الكرافيتي للحصول على الظروف الامثلية . كما تم تثبيت ارقام الاستحقاق التحليلية (figures of merits ) من منحنيات المعايرة كالمدى الخطي والحساسية وحد الكشف ونسبة الاسترداد بالمائة والدقة المعبر عنها بالاستنساخيه . جرى تطبيق هذه الطريقة لتعيين الدسفيروكسامين في دواء الدسفرال ووجد ان تركيزه هو 488 و 484 ملغم / وحدة في هذا الدواء باستعمال المعايرة المباشرة واضافات القياس على التوالي مقارنة بالكمية المصرحة على العبوة وهي 500 ملغم / وحدة .  كانت نتائج مطيافية الامتصاص الذري غير المباشرة ومطيافية الاشعة الفوق البنفسجية-المرئية المباشرة متفقة إذ نفذت معظم الحسابات الاحصائية باستخدام البرنامج الحاسوبي (Minitab version 11) .An indirect method using electrothermal atomic absorption spectrometry (ETAAS) has been established for the determination of DFOM in the drug desferal™as DFOM-Au (III) complex. The formation of this complex at 1:1 mole ratio computed by UV-Vis spectrophotometric technique was confirmed by distinction of the IR absorption spectra between the free DFOM and its complex. Several experimental factors that effect the formation of DFOM-Au (III) complex were optimized using AA responses. Aliquots of the complex extract were injected into a coated GF and the AA-signals measured. A direct calibration graph was constructed and from which the figures of merits were found such as: LDR (0.08-3.5 µg ml-1), m0º (293.3 pg), LOD (0.0154 µg ml-1), RSD% (2.0-3.5), recovery present (101.54±0.86), and %Erel (1.54). The established indirect ETAAS was applied to analyze the drug desferal™ for the determination of DFOM using direct and standard additions procedures and DFOM found to be 488 and 484 mg/unit respectively compared to the stated value of 500 mg/unit. All statistical calculations were implemented via the chemsoftware (Minitab version 11)

Spectrophotometric Determination of Epinephrine in Pharmaceutical Preparations Using Praseodymium as Mediating Metals

A simple, accurate and sensitive spectrophotometric method for the determinaion of epinephrine is described . The method is based on the coordination of Pr (III) with epinephrine at pH 6. Absorbance of the resulting orange yellow complex is measured at 482 nm . A graph of absorbance versus concentrations shows that beer 's low is obeyed over the concentration range (1-50)mg.ml-1 of epinephrine with molar absorpitivity of ( 2.180x103 L.mol-1.cm-1 ), a sandell sensitivity of (0.084 mg.cm-2 ), a relative error of (-2.83%) , a corrolation coffecient (r= 0.9989) and recovery % ( 97.03 ± 0.75 ) depending on the concentration.This method is applied to analyse EP in several commercially available pharmaceutical preparations using direct methods .All statistical calculations are implemented via a Minitab software version 11

The Influence of Color on Impulsivity and Arousal: Part 2 – Chroma

In the previous paper (Part 1), the effect of hue on impulsivity and arousal were studied. From those results, yellow, red and orange were selected for further investigation since participants’ performance was consistent with a low arousal state (high error rate and long response time) on the yellow background and high arousal state (low error rate and short response time) on the red background whereas orange was the color that tended to result in high impulsivity. This paper will mainly investigate the fundamental theory of how chroma influences people’s impulsivity and arousal states. The same as in the previous paper, the two main factors used to measure impulsivity and arousal in this paper are also response time and error rate for each colored background. In the psychophysical experiment, participants were looking at backgrounds in three hues (red, yellow and orange) with different chroma levels on screen to complete a range of psychometric tests. During the experiment, participants gave their response to the psychometric test as quickly and accurately as possible. From the results it can be seen that chroma has a significant influence on participants’ response time and error rate, and influences impulsivity and arousal. Gender difference will also been discussed in this paper

Assessing masticatory performance with a colour-mixing ability test using smartphone camera images

BACKGROUND Colour-mixing ability tests are frequently used to assess masticatory performance, but the image acquisition process may be cumbersome and technique sensitive. OBJECTIVES To evaluate the reliability of smartphone camera images in assessing masticatory performance using a colour-mixing ability test. METHODS Participants were recruited into three groups of dental state (n = 20 each): fully dentate, removable partial denture wearers and complete denture wearers. After performing a colour-mixing ability test, images of the gum specimens (Hue-Check Gum©) were captured with two smartphones and compared with the images obtained from a flatbed scanner by two examiners. The images were analysed with a subjective- (SA) and an opto-electronical assessment (VoH). Inter- and intra-rater reliability were tested. ANOVA models with repeated measures were used for statistical analysis (⍺ = .05). RESULTS All three image acquisition techniques were able to distinguish masticatory performance between different dental states. For SA, inter-rater reliability was fair to substantial and intra-rater reliability was substantial to almost perfect. For VoH, inter-rater reliability with the smartphones was at times different between two examiners, but the intra-rater assessment was reliable. The opto-electronic analysis with smartphone images underestimated the masticatory performance significantly when compared to the flatbed scanner analysis. Seven-day ageing of the specimens did not significantly affect the results. CONCLUSIONS The assessment of masticatory performance with the Hue-Check Gum© is a reliable method. The use of smartphones may occasionally underestimate masticatory performance; image acquisition with a flatbed scanner remains the gold standard. A centralised analysis of the photographed wafer may foster the reliability of the diagnosis

Single-visit chairside adjustment of a metal-acrylic resin implant-supported fixed complete dental prosthesis on an unloaded implant using a novel fixed attachment system: a case report

Background: Implant-supported prosthetic treatment options are reliable for elderly edentulous patients with systemic health problems. These patients often need cost- and time-efficient solutions to avoid complications. However, it is a challenge for clinicians to treat these patients without surgical interventions, placement of additional implants, or the need to renew existing prostheses. Case presentation: A 75-year-old medically compromised caucasian male patient using multiple medications was referred for prosthetic rehabilitation of his edentulous maxilla after several implant failures. Because the patient's health was compromised, further surgical interventions were ruled out and the treatment was centered on the use of the remaining implants by placing a fixed attachment system and altering the existing prosthesis. The stepwise management of the patient's situation through the use of a new attachment system and adjustment of existing prosthesis is described in the present case report. Conclusions: Although implant therapy is not always contraindicated for medically compromised patients, it is preferable not to perform extensive surgeries to avoid complications. This clinical report describes an alternative, safe option based on a novel fixed attachment system to salvage an existing maxillary implant-supported fixed complete dental prosthesis of a patient with systemic health problems

Effect of hydrothermal aging on the microhardness of high- and low-viscosity conventional and additively manufactured polymers.

STATEMENT OF PROBLEM Studies on the microhardness of novel additively manufactured polymers compared with well-established low- and high-viscosity composite resins with regard to chemical composition are lacking. PURPOSE The purpose of this in vitro study was to evaluate the effect of hydrothermal aging on the microhardness of various conventional and additively manufactured polymers. MATERIAL AND METHODS Cylindrically shaped specimens (N=240, n=10 per group) (Ø10×2 mm) were either additively manufactured (6 groups) or conventionally (6 groups) manufactured by using 3D (Optiprint Temp [OP; Dentona]; C&B MFH [ND; NextDent]; Saremco print CROWNTEC [SA; Saremco Dental AG]; Temp Print [TP; GC]; 3DELTA ETEMP [DM; Deltamed]; MED690 [ST; Stratasys, Ltd]) or conventional low (Gradia Direct [GR; GC]; Clearfil Majesty [CM; Kuraray Noritake]; Tetric EvoCeram [TE; Ivoclar Vivadent AG]) and high (Gradia Direct Flo [GR-F; GC]; Clearfil Majesty Flow [CM-F; Kuraray Noritake]; Tetric EvoFlow [TE-F; Ivoclar Vivadent AG]) viscous materials. All specimens were randomly allotted to 2 different aging methods (no-aging [dry] or aging by thermocycling [TC], ×6000, 5 °C-55 °C) and Vickers hardness (VH) tested (ZHV30; Zwick). Three indentations were made on each specimen (0.98-N load, duration 15 seconds). The calculated average microhardness value of each specimen was statistically analyzed by using 2-way ANOVA and Tukey post hoc tests (α=.05). Two-parameter Weibull distribution was calculated to predict the reliability of material type and aging method on VH. RESULTS The mean ±standard deviation VH ranged between 17 ±0.5 VHN and 68 ±0.5 VHN in the following ascending order: group STa.05). The mean ±standard deviation of HV for aged (37 ±1 VHN) and nonaged (35 ±1 VHN) specimens were statistically similar (P>.05). The Weibull distribution values presented the highest shape for the aged group SA (37.81). CONCLUSIONS The choice of the material had a significant effect and resulted in lower hardness for the 3-dimensionally printed materials than for the conventional composite resins. Under fatigue conditions, the choice of the material showed no significant difference when the Vickers microhardness was evaluated