Lower Gap Values Research Articles

Vibrational assignments of monohydrate dimer of violuric acid by using FT-IR, FT-Raman and UV spectra and DFT calculations in different media

Experimental FT-IR, FT-Raman and UV spectra have been combined with hybrid B3LYP/6–311++G** calculations and the scaled quantum mechanical force field (SQMFF) methodology to study structural and vibrational properties of monohydrated dimer (MD) of violuric acid in gas and aqueous media. Complete vibrational assignments and its scaled force constants are reported together with the corresponding to anhydrous and monohydrate monomer. From four anhydrous C1, C2, C3, C4 monomers, C4 is the most stable in both media. In solution, the initial structure of C2 change to the tautomeric species most stable C4. The MD reveals a higher solvation energy while natural bond orbital (NBO) and atoms in molecules (AIM) calculations support the higher stability of this species due to the six H bonds interactions and to its higher expansion of volume in solution. The MD is the most reactive species, as revealed by the lowest gap value and by high global electrophilicity and most negative global nucleophilicity indexes. Very good concordances are observed among the predicted IR, Raman, 13C NMR and UV spectra and the corresponding experimental ones. Comparisons of predicted 13C NMR and electronic spectra with the experimental one show that those three species of violuric acid could be present in aqueous solution. Similar f(νC=O) and f(νC-O) force constants for the three species are justified by the important delocalization of electrons evidenced in anhydrous and monohydrate species by NBO calculations.

Structural and vibrational characterization of di-hydrated hydrochloride tacrine combining DFT with SQMFF approach

This research is a continuation of previously reported article on anhydrous freebase, cationic and hydrochloride tacrine. Here, structures and properties of di-hydrated species of cholinesterase inhibitor tacrine have been studied in gas phase and aqueous solution by using B3LYP/6-311G* and wB97XD/6-311G* levels of theory. Both methods show strong changes in the positions of two water molecules and similar solvation energies (−192.52 kJ/mol with the B3LYP method and −191.95 kJ/mol with the other one). The B3LYP method predicts low gap values for the anhydrous (2.4572 eV) and di-hydrated (3.2708 eV) species of tacrine in gas phase than the wB97XD/6-311G* method (7.2300 eV). Hence, higher reactivities are expected for the di-hydrated species in both media. Atoms in molecules (AIM) calculations support the lower stability of di-hydrated species in solution in agreement with its higher reactivity in this medium. Complete assignments of 104 vibration modes expected for di-hydrated hydrochloride by using the scaled mechanical force field (SQMFF) methodology have been reported. Both methods predict different assignments and scaled force constants presenting higher values those calculated with the wB97XD/6-311G* method. The predicted IR, Raman and 1H NMR spectra with both methods show good correlations with the corresponding experimental ones, however, better concordances between the 13C NMR and UV spectra are observed with the wB97XD/6-311G* method.

The Perception of Road Users on Flyover Development Impact: A Case of Jalan RE Martadinata Bogor

The high number of vehicles and the position of the railway line, which is on the same level as the road, can cause congestion. One of the sources of traffic jam locations in Bogor is on Jalan Re. Martadinata. The purpose of this research is to analyze the perceptions of road users on the Martadinata Bogor Flyover. The data collection method was carried out by distributing online questionnaires using a platform, Gform, containing seven related parameters before and after the construction of the flyover. The results of the respondents' answers were processed using the Microsoft Excel application and presented as a spider chart. In the results of the respondent's assessment, all parameters experienced an increase. Three parameters have the highest gap values, and road users and respondents feel the increase, including traffic density, accessibility, and comfort for road users. In addition, there are three parameters with the lowest Gap values, including road conditions, environmental conditions, and road components

Traffic Management Effectivity of Bulak Kapal Underpass Development, Bekasi Indonesia

Crossroads are one of the places that become a source of congestion. One of the intersections that are a source of congestion in Bekasi is the Bulak Kapal Intersection. This study aims to analyze the effectiveness of traffic management in the Bulak Kapal Underpass. The data collection method was carried out by distributing questionnaires offline and online. Data processing from respondents' questionnaire answers is presented using a spider chart with Microsoft Excel tools. The results showed that eleven parameter assessments before the Underpass was built and after the Underpass was built experienced an increase. The three parameters with the highest gap values or parameters that share a significant increase are traffic density, vehicle speed, and comfort. Meanwhile, the three parameters with the lowest gap values are road condition parameters, road completeness, and environmental friendliness.

Analysis of Academic and Administration Information Systems Using Servqual and Kano Methods

Academic and Administrative Information System (SIAKAdm) is an online-based information system service for students of Hangtuah University Pekanbaru. With the development of information systems in the academic field, we must also test information systems, there are several problems that users feel that the quality of service of the Academic Information System (SIAKAdm) has not run effectively and efficiently, such as, there are often delays when filling in KRS, color contrast in the system is too disturbing to the user's eyes, there is no edit menu on the student profile, and finally there is no complaint lyanan menu or C3 servicedesk menu. This research was conducted using the ServQual method and the Kano method. The ServQual Method can be said to be a method used to measure the quality of service attributes of a dimension, while the Kano Method can be interpreted as a model built to understand how well their product or service meets the needs of users. This data collection process is by conducting interviews and distributing questionnaires of 98 respondents using the Simple Random Sampling technique. The data was obtained using IBM SPSS 26 and calculated the GAP value using Microsoft Excel. The results of this study The highest gap value was in the Assurance variable, with a GAP value of -4.54. While the lowest gap value is in the Responsivennes variable of -2.51.

Phomoxanthone A, Compound of Endophytic Fungi Paecilomyces sp. and Its Potential Antimicrobial and Antiparasitic.

The present work reports the isolation and biological evaluation of three dimeric xanthones from Paecilomyces sp. EJC01.1 isolated as endophytic from Schnella splendens, a typical plant of the Amazon. The compounds phomoxanthone A (1), phomoxanthone B (2) and dicerandrol B (3) were isolated by chromatographic procedures and identified by spectroscopic methods of 1D and 2D NMR and MS. The extracts and compound 1 showed antimicrobial activities against Bacillus subtilis, Escherichia coli, Staphylococcus aureus, Salmonella typhimurium and Pseudomonas aeruginosa. The compound phomoxanthone A (1) showed greater inhibitory activity against B. subtilis (MIC of 7.81 µg mL−1); in addition, it also pronounced inhibitory effect against promastigote forms of Leishmania amazonensis (IC50 of 16.38 ± 1.079 µg mL−1) and epimastigote forms Trypanosoma cruzi (IC50 of 28.61 ± 1.071 µg mL−1). To provide more information about the antibacterial activity of compound 1, an unprecedented molecular docking study was performed using S-ribosyl-homocysteine lyase (LuxS) (PDB ID 2FQO), which showed a possible interaction of phomoxanthone A with two of the residues (His58 and Cys126) that are fundamental for the catalysis mechanism in B. subtilis, which may be associated with the higher activity, when compared to other bacteria, observed in experimental studies. Additionally, quantum studies (DFT) were performed, for which a low gap value (5.982 eV) was observed, which corroborates the reactivity of phomoxanthone A. Thus, phomoxanthone A can be a good agent against pathogenic bacteria.

Analisa Kepuasan Pelanggan Pengangkutan Sampah Menggunakan Metode Importance Performance Analysis (Studi Kasus Pada Dinas Lingkungan Hidup Kabupaten Jember)

This study aims to determine what quality dimension attributes have met customer satisfaction for waste transportation of the Department of the Environment of Jember Regency. The data used in this study are primary data. The data processing method in this study uses the Data Instrument Test Analysis method, namely: Validity Test and Reliability Test, and uses the Importance Performance Analysis (IPA) analysis method, using 5 service quality dimension attributes, namely Physical Evidence (Tangibles), Reliability (Reliability), Responsiveness, Assurance, and Empathy (Emphaty). The results showed that the Reliability Dimension has a very low gap value, which indicates that the quality of service provided by the Environmental Service Office of Jember Regency is very satisfying for customers. Meanwhile, the dimension of responsiveness has the highest gap, which can be concluded that there is dissatisfaction for customers with the responsiveness of the Jember Regency Environmental Service in dealing with existing problems. This of course will become a reference for the Jember Regency Environmental Service in improving the quality of its services.

Effect of different preparation finishing procedures on the marginal and internal fit of CAD-CAM-produced restorations: A microcomputed tomography evaluation

Statement of problemAccurate fit is an important factor for the longevity of computer-aided design and computer-aided manufacturing (CAD-CAM) ceramic restorations. Few studies have compared how restoration finishing procedures affect the marginal and internal fit of these restorations by using microcomputed tomography (μCT). PurposeThe purpose of this in vitro study was to evaluate the preparations with different surface finishing procedures for the fit of CAD-CAM restorations by using μCT. Material and methodsA total of 28 anatomic contour monolithic feldspathic ceramic crowns were produced for 4 typodont teeth prepared according to the different surface finishing procedures (n=7). The generated experimental groups were finishing with extra-coarse (181 μm) diamond rotary instruments (EC), finishing with fine (40 μm) diamond rotary instruments after extra-coarse diamond rotary instruments (F), finishing with very fine (20 μm) diamond rotary instruments after extra-coarse and fine diamond rotary instruments (VF), and finishing with extra-coarse, fine, and very fine diamond rotary instruments followed by polishing rubber points (P). μCT scans were obtained to measure the gaps between the typodont teeth and the crowns. Reference points such as the margin, chamfer (the deepest point), cusp tips, and central fossa were determined, and 196 measurements were made. Data were analyzed by using 2-way analyses of variance and the Tukey HSD test (α=.05). ResultsThe highest gap values in all sections were observed in the finishing with extra-coarse (181 μm) diamond rotary instruments group. The lowest gap value in the marginal point was observed in the P group (P<.05). In total, the gap values of the reference points were in the order of margin, chamfer, cusp, and central fossa. ConclusionsμCT evaluation showed that tooth preparation finishing procedure with finer grit rotary instruments yielded better marginal fit for monolithic feldspathic CAD-CAM restorations. The internal gap values of all groups were also in the range of clinically acceptable values, important for mechanical properties.

The gap analysis between perception and expectation of visitor in Bantimurung Bulusaraung National Park

This study aimed to analyze the gap between visitors’ perception and expectation for better development of ecotourism potential in Bantimurung Bulusaraung National Park (BBNP). The gap analysis approach used a descriptive survey to 200 respondents selected by non-probability sampling in November 2018. Several ecotourism potentials assessed were accessibility, accommodation, cultural attractions, public facilities, human resources, information and natural attractions. The result showed that there is a higher expectation rather than perception of visitor in BBNP. The highest gap value was found in public facility [-1.71], while the lowest gap value was found in accessibility [-0.97]. Thus, public facility should be prioritized to develop in order to meet the visitor s’ expectation. In term of public facility, the highest gap value was found in communication facilities (telephone, fax, internet), while the lowest gap value was found in garbage dump and clean water availability. Therefore, the top priority to improve was the quality and quantity of communication facilities (telephone, fax, internet).

Tingkat Kepuasan Pasien RSIA Siti Hawa dalam Upaya Peningkatan Kualitas Pelayanan Menggunakan Metode Service Quality (SERVQUAL)

Patient satisfaction is an important indicator in improving the quality of the hospital. RSIA Siti Hawa always tries to improve the quality of the hospital in order to provide excellent service to patients. One of the efforts made to improve the quality of the hospital is by knowing the level of patient satisfaction. The purpose of this study was to determine the extent of patient satisfaction with the Siti Hawa Hospital service so that it can assist management in evaluating and improving services to improve quality. This research was conducted using the Service Quality (SERVQUAL) method which has five dimensions, namely tangible (physical evidence), reliability (reliability), responsiveness (responsiveness), assurance (assurance) and empathy (empathy). This measurement is carried out to identify the patient's expectations and perceptions so that from the five dimensions of Service Quality, the overall service quality can be seen by looking at the value of the gap that occurs due to the mismatch between patient expectations and perceptions. The data processed in this study were questionnaire data from 30 respondents / patient. The result of this test is that the service quality of the five dimensions of service quality consisting of 14 question attributes has a positive gap value. The highest gap value is 0.47 in the 12th question attribute regarding politeness and friendliness of officers in providing services, and the lowest gap value is in the 6th attribute with a value of 0.27 regarding the timeliness of service schedules. Based on the dimensions, the order of the rank dimensions from the highest is empathy, assurance, responsiveness, tangible and reliability. Based on the results of this study, it can be concluded that the services provided by RSIA Siti Hawa to patients can be said to be good, and the results of these measurements can be used as an evaluation in improving the quality of hospital services.

Tingkat Kepuasan Pasien RSIA Siti Hawa dalam Upaya Peningkatan Kualitas Pelayanan Menggunakan Metode Service Quality (SERVQUAL)

Patient satisfaction is an important indicator in improving the quality of the hospital. RSIA Siti Hawa always tries to improve the quality of the hospital in order to provide excellent service to patients. One of the efforts made to improve the quality of the hospital is by knowing the level of patient satisfaction. The purpose of this study was to determine the extent of patient satisfaction with the Siti Hawa Hospital service so that it can assist management in evaluating and improving services to improve quality. This research was conducted using the Service Quality (SERVQUAL) method which has five dimensions, namely tangible (physical evidence), reliability (reliability), responsiveness (responsiveness), assurance (assurance) and empathy (empathy). This measurement is carried out to identify the patient's expectations and perceptions so that from the five dimensions of Service Quality, the overall service quality can be seen by looking at the value of the gap that occurs due to the mismatch between patient expectations and perceptions. The data processed in this study were questionnaire data from 30 respondents / patient. The result of this test is that the service quality of the five dimensions of service quality consisting of 14 question attributes has a positive gap value. The highest gap value is 0.47 in the 12th question attribute regarding politeness and friendliness of officers in providing services, and the lowest gap value is in the 6th attribute with a value of 0.27 regarding the timeliness of service schedules. Based on the dimensions, the order of the rank dimensions from the highest is empathy, assurance, responsiveness, tangible and reliability. Based on the results of this study, it can be concluded that the services provided by RSIA Siti Hawa to patients can be said to be good, and the results of these measurements can be used as an evaluation in improving the quality of hospital services.

5-((1H-imidazol-1-yl)methyl)quinolin-8-ol as potential antiviral SARS-CoV-2 candidate: Synthesis, crystal structure, Hirshfeld surface analysis, DFT and molecular docking studies

A potential new drug to treat SARS-CoV-2 infections and chloroquine analogue, 5-((1H-imidazol-1-yl)methyl)quinolin-8-ol (DD1) has been here synthesized and characterized by FT-IR, 1H-NMR, 13C-NMR, ultraviolet-visible, ESI-MS and single-crystal X-ray diffraction. DD1 was optimized in gas phase, aqueous and DMSO solutions using hybrid B3LYP/6-311++G(d,p) method. Comparisons between experimental and theoretical infrared spectra, 1H and 13C NMR chemical shifts and electronic spectrum in DMSO solution evidence good concordances. Higher solvation energy was observed in aqueous solution than in DMSO, showing in aqueous solution a higher value than antiviral brincidofovir and chloroquine. on Bond orders, atomic charges and topological studies suggest that imidazole ring play a very important role in the properties of DD1. NBO and AIM analyses support the intra-molecular O15-H16•••N17 bonds of DD1 in the three media. Low gap value supports the higher reactivity of DD1 than chloroquine justified by the higher electrophilicity and low nucleophilicity. Complete vibrational assignments of DD1 in gas phase and aqueous solution are reported together with the scaled force constants. In addition, better intermolecular interactions were observed by Hirshfeld surface analysis. Finally, the molecular docking mechanism between DD1 ligand and COVID-19/6WCF and COVID-19/6Y84 receptors were studied to explore the binding modes of these compounds at the active sites. Molecular docking results have shown that the DD1 molecule can be considered as a potential agent against COVID-19/6Y84-6WCF receptors.

The measurement of customer satisfaction towards the service quality at xyz wholesale by using fuzzy service quality method

The service quality is the most important factor for the company, in order for the company can keep running and developing. The ways to improve service quality are to find out and understand the customers’ desires. The quality service happens when the services or products meet the customers’ expectations. This research was conducted at XYZ wholesaler to find out the quality service level and propose the attributes that need to be improved the quality of services. Furthermore, based on the gap value per attribute that needs to be prioritized by the grocery to being improved was the support facilities distance and the shopping area obtained the highest gap value of -4.08. Whereas the lowest gap value was in grocery location is 2.33. This matter showed that the grocery location was the attribute rated by the customers better than the other attributes. While based on the value per dimension, the dimension that needs to be prioritized by the grocery to being improved was the empathy dimension which obtained the highest gap value of -2.20. Whereas the lowest gap value was the assurance is 0.05. It showed that customer’ assessments towards the assurance dimension better than the others dimension

The Effect of Quality Service Towards Outpatients Satisfaction at Poasia Community Health Centre

The quality of outpatient services can be measured by the SERVQUAL model that considers five dimensions: tangibles, reliability, responsiveness, assurance, and empathy. This study aimed to look at the effect of service quality on outpatient satisfaction at the Poasia community health center's pharmacy. The subjects in this study were 33 outpatients. The analysis technique used is gap analysis to compare patients' expectations and reality, normality test data based on questionnaire patient satisfaction tested for validation. This study's results indicate the average value of the gap in the Poasia community health center's pharmacy, amounting to -0.44. From the value of the gap, the lowest gap value in the pharmacy center of Poasia is the place of service and the provision of inadequate drug information of -0.88. Based on the paired t-test where a significant value &gt;0.05, Ho is rejected, and Ha accepted, which means a significant difference between the quality of service and patients' satisfaction in the Pharmacy of Puskesmas Poasia Kendari City. This study concludes that there is a significant gap between expectations and reality at the Poasia community health center's pharmacy.

Analisis Kualitas Pelayanan terhadap Kepuasan Pasien Rawat Jalan di Puskesmas Puuwatu Kota Kendari menggunakan Metode SERVQUAL

The quality of outpatient services can be measured by the SERVQUAL model that takes into account 5 dimensions, namely tangible, reliability, responsiveness, assurance, and empathy. The purpose of this study was to look at the effect of service quality on outpatient satisfaction at the Apotek Puskesmas Puuwatu Kota Kendari. The subjects in this study were 34 outpatients. The analysis technique used is gap analysis to compare expectations and reality received by patients, normality test data based on questionnaire patient satisfaction that has been tested for validation. The results of this study indicate the average value of the gap in the pharmacy of Apotek Puskesmas Puuwatu Kota Kendari amounting to 0.27. From the value of the gap, the lowest gap value in the pharmacy center of Puuwatu is the place of service, and the provision of inadequate drug information of -0.24. Based on the paired t-test where significant value&gt; 0.05 then Ho is rejected and Ha accepted so that means a significant difference between the quality of service to the satisfaction of patients in Apotek Puskesmas Puuwatu Kota Kendari. This study concludes that there is a significant gap between expectations and reality at the Apotek Puskesmas Puuwatu Kendari City

Smart ZnO decorated optimized engineering materials for water purification under natural sunlight

Developing and designing smart civil engineering materials for environmental depollution in our daily life is a major issue. ZnO nanostructures implemented onto civil engineering material surfaces by low cost hydrothermal growth could be one of the most promising solutions, and already showed a good water purification efficiency by photocatalysis under UV light. Nevertheless, there are two main factors to work out in order to simplify and intensify the photocatalyst production on engineering materials. The first one is the reduction of the growth time. The second one is the use of sunlight, which is the most abundant, clean, and renewable light source available. However, reducing the growth time might have an impact on the photocatalytic efficiency due to the surface/volume ratio modification. In this work, a short and efficient hydrothermal synthesis (2 h or 1 h 30 min vs 4 h) was used to grow ZnO nanostructures directly on non-conventional substrates such as tiling and concrete, demonstrating an excellent photocatalytic activity for organic pollutant degradation in water under natural sunlight, even during cloudy days. Decreasing the growth time showed no significant influence on tiling samples and even increased their photocatalytic efficiency until the optimal value obtained with a growth time of 2 h. A strong impact of the shorter growth time was observed on concrete samples, as reducing the growth time leads to complex ZnO nanosheet structures with a lower gap value (3.11 eV for 1 h 30 min against 3.17 eV for 4 h) due to a possible influence of the surface pH value and the complex chemical composition of concrete.

Solving the e-commerce logistics problem using anti-predatory NIA

E-commerce is expanding their roots in every business. Fast, efficient, reliable, timely delivery of goods and optimal transportation cost are the major challenges in e-commerce. To overcome these challenges, e-commerce companies are using a well-planned arrangement of warehouses and distribution centres (logistics network). This logistics network also reduces the operational cost and capital investment of an e-commerce company. This study proposes a novel solution to deal with e-commerce logistics problem (ECLP) using anti-predatory NIA (APNIA). The proposed approach is useful for identifying cities where warehouses and distribution centres can be established; and allocating the distribution centres to warehouse in order to reduce total cost of goods transportation. The proposed approach is also useful for predicting the number of warehouses to be established for optimal logistics network. The experimental evaluation reveals that the proposed method achieves 2.30% lower gap value and 20% more consistent optimal results as compared to the genetic algorithm.

An Application of the Local Branching to the Identical Parallel Machines Scheduling Problem

In this paper, we consider the Identical Parallel Machine Scheduling Problem, with sequence-dependent setup time and the aim of minimizing makespan. We present two solution approaches: mathematical formulation of Mixed Integer Linear Programming (MILP) and the exact Local Branching method. The aim of this paper is the application and comparison of performance between the two approaches and the analysis of the convergence of each method. This analysis was based on the variation of setup times (between 10% and 50% of the processing time of the task in a machine, depending on the test performed), number of tasks (20, 30, 40, 50 and 100) and the number of machines available (3 and 5 machines). Both approaches were tested with a computational time of one hour in each test. As a consequence, we compared the optimality GAP for all instances by calculating the Lower Bound of each generated problem. The results obtained for instances with 30 tasks or more indicate that the Local Branching method presented better results when having a more significant number of machines. This gain increases as there is an increase in the number of tasks and machines. For smaller problems and with fewer parallel machines, the MILP approach presents lower GAP values.

A comparison of the marginal and internal fit of porcelain laminate veneers fabricated by pressing and CAD-CAM milling and cemented with 2 different resin cements

Statement of problemThe marginal and internal adaptations of porcelain laminate veneers (PLVs) are key elements in their long-term success. However, the marginal and internal fit obtained with a pressable material compared with computer-aided design and computer-aided manufacturing (CAD-CAM) needs further investigation as does the choice of cement used. PurposeThe purpose of this in vitro study was to evaluate the marginal and internal fit of PLVs fabricated using pressing and CAD-CAM milling and cemented using 2 types of composite resin cement. Material and methodsTwenty PLVs were fabricated from VITA PM9 pressable material, and 20 veneers were milled using VITA Blocs Mark II. Veneers were cemented to composite resin dies using either RelyX Veneer cement or Variolink-N cement. Specimens were embedded in clear resin and sectioned incisogingivally and mesiodistally. Marginal discrepancy at the incisal and cervical positions and the internal gap at 6 different locations were evaluated by using a scanning electron microscope. Two-way ANOVA followed by Tukey multiple comparisons were used to examine difference among groups (α=.05). ResultsThe cement and fabrication methods did not show any significant effect for absolute marginal gap (AMG) at the incisal edge, AMG at the cervical margin or marginal gap at the incisal edge. However, both had a significant effect on marginal gap at the cervical margin (P=.038 for the fabrication method and P=.050 for the cement used). Also, both cement and fabrication methods had a significant effect on internal gap average (P<.001). The lowest gap values were reported for veneers fabricated from VITA PM9 by using the press technique and cemented with RelyX Veneer cement. When the position of gap measurements was taken into consideration, it was the only significant factor (P<.001 for the effect of position on AMG and P<.001 for the effect of position on marginal gap). Gaps at the cervical position were significantly lower than gaps at the incisal position. ConclusionsSmaller marginal and internal discrepancies were recorded for PLVs fabricated by using the pressing technique and cemented using RelyX Veneer cement compared with milled veneers and Variolink-N cement. Larger discrepancies were present incisally than cervically.

Electrochemical, optical and morphological properties of poly (N-vinylcarbazole/TiO2) and (N-vinylcarbazole/aniline)/TiO2 copolymer prepared by electrochemical polymerization

AbstractPoly (N-vinylcarbazole) (PVK) and a new copolymer, PVK/polyaniline (PANI), have been successfully prepared by electrochemical polymerization of N-vinylcarbazole (NVK) and NVK/aniline from acetonitrile medium and LiClO4 supporting electrolyte. Composite thin films were studied by cyclic voltammetry (CV) in LiClO4/acetonitrile solutions on an indium tin oxide (ITO) electrode. The influences of concentration of titanium dioxide (TiO2) on the electrochemical properties of these composite materials were also investigated. The results of scanning electron microscopy (SEM) confirm the presence of TiO2 in the composite, which consequently modifies the morphology of the film significantly. Topographical analysis has shown that TiO2 nanoparticles (NPs) affect the morphology of thin films (roughness). The analysis of the voltammograms of PVK and of (PVK+PANI) before and after the addition of TiO2 at different concentrations shows a redox couple which was not observed in the absence of TiO2. The impedance spectroscopy study shows that the resistance of the PVK and (PVK+PANI) films decreases with increasing of TiO2 concentration, and this in turn contributes to a good conductivity of the film. The optical characterization of the composites has been carried out by UV-Vis absorption and photoluminescence (PL) spectroscopy and it was noted that the samples (PVK+10−2 TiO2) exhibited high transmittance (83%) in the visible region and a low gap value (2.69 eV) which confirms that this material can be used in a photovoltaic cell. This is explained by the introduction of the donor levels in the band gap of PVK by the TiO2, due to an effective doping.