The conductometric study of ligand structure influence on the Pb(II) complexation with crown ethers in different solvents has been investigated. In this paper, the complexation reaction of macrocyclic ligand, 18-crown-6 (18C6), dibenzo-18-crown-6 (DB18C6), and Pb(II) cation was studied in different solvents: dichloromethane (DCM) and 1,2- dichloroethane (1,2-DCE). The effects of surfactant structure (Triton X-100 and Triton X-45) on the conductivity of the Pb(II) complex with 18-crown-6 and dibenzo-18-crown-6 ether have been investigated. The conductance data showed that the stoichiometry of the complexes in most cases is 1:1(ML). It is also demonstrated that the influence of crown ethers is deeply affected by the organic solvent used. In the solvents studied, the stability of the resulting complexes showed higher stability in dichloromethane comparing with 1,2- dichloroethane. Macrocyclic ligand 18-crown-6 showed more suitable for complexation of Pb(II) ions compared to dibenzo-18-crown-6. Adding a surfactant affected the higher absolute values of the conductivity of systems, but not the change in the stoichiometric ratio between a metal ion and macrocyclic ligand.

Simulation in the production process represents the implementation of processes in real-time and space. Current trends are heading towards the implementation and expansion of various types of automated delivery systems in many industrial enterprises. These efforts are supported by requirements to increase reliability, reduce operating costs and time as well as meet operational schedules. The present article pays attention to the use of simulations, which are supporting tools in ensuring the operation of the production process, focusing on the evaluation and planning of the material flow. The first part of the paper presents a theoretical description of problems in the area of application of simulation tools in the production process with a subsequent focus on material flow analysis. The core of the paper presents a description of the analysis of approaches to material flow assessment, using supportive simulation tools in line with the ideas of business digitization. At the end of the article, the overall evaluation and summary of the issue are described.

Modern people have embraced plants as a source of useful bioactive compounds. As such, plants with medicinal properties have become essential components in human life. The purpose of this study was to investigate the phytochemical profile of the extract of Dioscorea steriscus tubers obtained from Zimbabwe. Phytochemicals were extracted from tubers of D. steriscus using aqueous acetone. UV-Visible Spectrophotometry, Fourier transform infrared (FTIR) spectrometry and highperformance liquid chromatography (HPLC) techniques were used to determine the phytochemical profile of the tuber extract. The yield of phytochemicals extracted from D. steriscus tubers was found to be 6.38 %. The presence of bioactive compounds possessing phenyl, organic hydroxyl, amine, carboxyl, carbonyl, acyl, alkyl and aromatic functional groups was confirmed using UVVisible and FTIR analysis. The presence of substantial amounts of vanillic acid and kaempferol in D. steriscus tubers was confirmed using HPLC analysis. In support of the ethnobotanical values of Dioscorea species, the study confirmed the presence of potent phytochemicals in the extract of D. steriscus tubers obtained from Zimbabwe.

The goal of this research is to determine possibility of investing individual personal financial assets in investments funds in Republic of Srpska and does households have financial assets that can be invested. In this research capital market of Republic of Srpska is represented, the structure and organization of Banja Luka Stock Exchange, and legal framework for investment fund management companies. The volume of activity in investment funds is shown in presentation of activity Banja Luka Stock Exchange, following with the assumed reasons of current status.

Even though pesticides constitute a very essential component of improved and modern agriculture, the abuse of pesticides has brought substantial poisoning worldwide, especially in developing countries. This review investigates the possible sources by which people are exposed to pesticides worldwide and the impact on their livelihood. The group who often are exposed to these chemicals includes, farm workers, children, farmers, and family members who have direct link to the pesticide application sites as well as persons who are exposed to these pesticides through the domestic use of waterbodies and consumption of foodstuff or crops sprayed with these pesticides. Central to this review is the critical discussions of the different scientific research findings on health effects and risks related to pesticides usage. Again, organophosphates and organochlorines pesticides are found in most of the pesticide contaminated sites and can remain in soil and waterbodies for a longtime. This work has also provided cases of incidence of carcinogenicity in humans, as a result of pesticides use. We concluded that, breeding or developing insect tolerant or resistant crops may curb the profuse use of pesticides in agriculture.

The research was carried out from April to July 2019, in Republika of Srpska. The sample was suitable. It was made up of
294 respondents aged between 15 and 73. The average age of the respondents was 22,92 years. Male respondents numbered 120 or 40,82%, and females 174 or 59.18%. Independent variables are gender and age. The dependent variable is the level of the cognitive component of the social attitude. Milosavljevic's Skala PARADOKHIP & BM-2006-02-26 was used to examine the levels of cognitive component of the social attitude. The aim of the research was to verify the hypothesis about the paradoxical Relationship of cognition and non-cognition in the cognitive component of the social attitude, according to which a greater scope of the cognitive component of the social attitude corresponds to an even greater extent of the experience of non-cognition (not-knowing) and vice versa. It has been confirmed that the greater scope of cognition in the cognitive component of the social attitude corresponds to an even greater extent of the experience of noncognition, regardless of the gender of the respondents. With the aging, there is also a growing awareness that a greater scope of cognition in the cognitive component of the social attitude corresponds to an even greater extent of the experience of noncognition, and the existence of statistical significance (p<.05) has been confirmed between the categories of subjects aged 15- 18 and 24-73.

Many modern threaded joints especially in the oil and gas industry, must satisfy high requirements for steel mechanical properties of which they are made. To ensure efficient threading of such hard-to-machine materials (ultimate strength is more than 1250 MPa), it is necessary to use carbide cutting inserts with the negative rake angle at its corner. However, modern manufacturers of such inserts make them only with a zero value of the rake angle. This is due to the difficulty of profiling of the insert cutting edge. This article proposes the basics of such inserts automatic profiling which is based on the algorithm developed by the authors. It includes two corrective calculations of the insert cutting edge profile, namely: the radial displacement of the corner and the tangential displacement of the area forming the crest of the thread. As a result, the computer application with the input parameter of the rake angle and output parameter of the upgraded profile of the insert cutting edge is received.

The problems of forest and land fires continue to overshadow in Riau Province and Pelalawan District including the contributors of fire spots of forest and land fires. The handling and control of forest and land fires run during this time tend to be incidental and focus on the aspect of fire suppression only. The extinguishing and controlling of forest and land fires fire has been undertaken by several agencies in the local government organization of Pelalawan District. While the relationship between the agencies is more information share and informational relationship and the deployment of resource assistance is limited to the capacity of each organization during the occurrence of forest and land fires only, not led to a collaborative multi-disciplinary working approach (inter-organizational collaborative network) in the area of local government. This research aims to Described the management situation of forest and land fires that took place in Pelalawan District, conducting analysis and academic studies on the practice of Network Inter-Organization by controlling forest and land fires (Karhutla) in Pelalawan District, and formulating model Inter-organizational network-based organizations that can be applied to regional government of Pelalawan District in every bureaucracy organizations. The study used a qualitative descriptive approach with reference to literature studies and interview reluct collection by (Agranoff i McGuire, 2003).

Промјене окружења, нова тржишта и стратегије захтијевају стално унапре- ђивање система мјерења перформанси предузећа. Ефективно мјерење перфо- рманси је од кључне важности за успјешну имплементацију стратегије предузећа, његов развој и опстанак у савременој економији. Данас је нагласак на мјерењу свих области дјеловања предузећа, за шта је потребан широк обим финансијских и нефинансијских индикатора. Како савремено управљање организацијом подразумијева управљање њеним процесима, остварење циљева организације зависи од успјешности њених процеса. Успјешност процеса, односно способност процеса да испуне циљеве организације се мјери помоћу дефинисаних кључних идентификатора перформанси.

Rad se oslanja na Bowlby-jevu teoriju afektivnog vezivanja, u skladu sa pretpostavkom da kvalitet afektivne vezanosti u detinjstvu predviđa kasnije psihološko funkcionisanje osobe, te da samoubistvo, kao autodestruktivni čin, može biti posledica nesigurne vezanosti. Cilj ovog rada bio je utvrditi da li se pacijenti, koji su ispoljili suicidalno ponašanje, češće svrstavaju u neki od nesigurnih obrazaca vezanosti, u odnosu na zdrave ispitanike bez suicidalnih tendencija. Istraživanje je provedeno u Specijalnoj bolnici za psihijatriju u Sokocu, a uzorak je činilo 80 ispitanika muškog pola, svrstanih u dve grupe: grupu suicidalnih pacijenata (N1=40) i grupu zdravih, nesuicidalnih ispitanika (N=40). Kratkim, strukturiranim upitnikom napravljenim za potrebe ovog istraživanja, prikupljeni su podaci o subjektivnom doživljaju majke i oca. Ispitivanje porodične afektivne vezanosti provedeno je modifikovanim Brennanovim upitnikom, za procenjivanje porodične afektivne vezanosti (Stefanović-Stanojević, 2005). Za testiranje razlika između grupa korišćen je χ² test. Rezultati pokazuju da postoji statistički značajna razlika između ispitivanih grupa i to tako, da su se ispitanici iz grupe suicidalnih, značajno češće svrstavali u nesigurno-okupirani i nesigurno-plašljivi obrazac vezivanja (χ²(3)=23,928; p=0,000) i češće su odrastali uz prezaštićujuću, agresivnu ili majku sa psihičkim problemima (2(3)=28,976; p=0,000), dok razlike u odnosu na doživljaj oca nemaju statističku značajnost (2(2)=3,436; p=0,179).