Contemporary Materials最新文献_第9页

MONTE CARLO SIMULATIONS OF A POLYMER CHAIN MODEL ON EUCLIDEAN LATTICES 欧几里得晶格上聚合物链模型的蒙特卡罗模拟

Contemporary Materials Pub Date : 2019-10-10 DOI: 10.7251/comen1902167z

I. Živić, D. Marčetić, Sunčica Elezović Hadžić

引用次数: 0

THE DISPERSION-FLOCCULATION BEHAVIOUR OF THE NATURAL RAW CLAY SAMPLES FROM OMARSKA MINE 奥马尔斯卡矿天然原料粘土试样的分散絮凝特性

Contemporary Materials Pub Date : 2019-01-10 DOI: 10.7251/comen1901071t

Ljiljana Tankosić, S. Sredić, P. Tančić, Z. Nedić

{"title":"THE DISPERSION-FLOCCULATION BEHAVIOUR OF THE NATURAL RAW CLAY SAMPLES FROM OMARSKA MINE","authors":"Ljiljana Tankosić, S. Sredić, P. Tančić, Z. Nedić","doi":"10.7251/comen1901071t","DOIUrl":"https://doi.org/10.7251/comen1901071t","url":null,"abstract":"In present paper, studied were the dispersion-flocculation behaviour of the primary natural raw „clay samples” from Omarska mine (Republic of Srpska, Bosnia and Herzegovina). Namely, our previous results showed that during the processing of iron ore in the Omarska mine, large quantities of fine sized (15μm) waste sludge, with relatively high Fe concentrations, were generated. Sludge samples are composed of major goethite and quartz, less clay minerals, and minor magnetite and todorokite. Selective flocculation is one of the methods that can be applied for the separation of fine class iron minerals from impurities and depends on the individual components of the sludge and their behaviour. This paper presents part of the research of the individual components of the sludge. The „clay samples” are composed of major quartz and clay minerals, which dominate over minor contents of feldspars, amphiboles, goethite and hematite. The clay minerals were identified as mostly illite-sericite which prevails over kaolinite, and with chlorites which appears only sporadically. The dispersion-flocculation behaviour was studied by settling and flocculation experiments and Zeta potential measurements. A three different dispersants (sodium hexametaphosphate, sodium-pyrophosphate and sodiumsilicate), and anionic and non-ionic polyacrylamide (PAM) flocculants were used. It was established that the best results were achieved with sodium-hexametaphosphate (1000 g/t) and anionic A100 PAM.","PeriodicalId":10617,"journal":{"name":"Contemporary Materials","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86548201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

THE INFLUENCE OF REACTION TIME ON THE PROPERTIES OF MICROWAVE SYNTHESIZED POLY(LACTIDE) 反应时间对微波合成聚丙交酯性能的影响

Contemporary Materials Pub Date : 2019-01-10 DOI: 10.7251/comen1901056r

I. Ristić, M. Jotanović, T. Erceg, L. Nikolić, S. Cakić, V. Mićić, Stefan M. Pavlović, S. Begić

{"title":"THE INFLUENCE OF REACTION TIME ON THE PROPERTIES OF MICROWAVE SYNTHESIZED POLY(LACTIDE)","authors":"I. Ristić, M. Jotanović, T. Erceg, L. Nikolić, S. Cakić, V. Mićić, Stefan M. Pavlović, S. Begić","doi":"10.7251/comen1901056r","DOIUrl":"https://doi.org/10.7251/comen1901056r","url":null,"abstract":"The consequence of drastic reduction in fossil fuel reserves has forced the scientific community to find and develop new ways to exploit renewable resources and optimize the process of polymer materials production. The aim is to obtain applicable polymer whose complete life cycle is set in ecological framework. Poly(lactide) (PLA) meets these requirements as biodegradable polyester whose monomer is derived from the plant feedstock containing carbohydrates. PLA could be prepared using the different synthesis routes, but from the point of energy saving, as well as environmental protection, the microwave synthesis of PLA is the best solution. In this work, poly(L-lactide) were synthesized in microwave reactor. Reaction time was varied, while the other parameters of the synthesis were constant. The structures of obtained polymers were confirmed by Fourier – transform infrared spectroscopy (FT-IR). For determination of molar masses of poly(L-lactide) samples, the gel permeation chromatography (GPC) was applied. Thermal properties were investigated by differential scanning calorimetry (DSC).","PeriodicalId":10617,"journal":{"name":"Contemporary Materials","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89364983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

OXYCELLULOSE – MATERIAL FOR NEW APPLICATION AREAS 氧纤维素——新应用领域的材料

Contemporary Materials Pub Date : 2019-01-10 DOI: 10.7251/comen1901006m

Jovana Z Milanovic, Matea Korica, T. Nikolić, M. Kostić

引用次数: 1

SYNTHESIS OF ZnO-Аg NANOPARTICLES BY SOL-GEL METHOD 溶胶-凝胶法制备ZnO-Аg纳米颗粒

Contemporary Materials Pub Date : 2019-01-10 DOI: 10.7251/comen1901022j

S. Janković, Dragana Milisavić, Tanja Okolić, Dijana Jelić

引用次数: 1

CLINICAL MANIFESTATION AND INCIDENCE OF DENTAL ENAMEL EROSION IN PATIENTS UNDER ANTIHYPERTENSIVE THERAPY 降压治疗患者牙釉质侵蚀的临床表现及发生率

Contemporary Materials Pub Date : 2019-01-10 DOI: 10.7251/comen1901093a

N. Trtić, R. Arbutina, O. Janković, V. Mirjanić, V. Veselinović

{"title":"CLINICAL MANIFESTATION AND INCIDENCE OF DENTAL ENAMEL EROSION IN PATIENTS UNDER ANTIHYPERTENSIVE THERAPY","authors":"N. Trtić, R. Arbutina, O. Janković, V. Mirjanić, V. Veselinović","doi":"10.7251/comen1901093a","DOIUrl":"https://doi.org/10.7251/comen1901093a","url":null,"abstract":"Dental erosions are defined as an irreversible loss of hard dental tissue caused by long-lasting and repetitive acid action, which dissolves the surface layer of hydroxyapatite crystal structure and fluorapatite, and the aggressive noxis not being created by the bacteria. Dental erosions can also be classified as occupational diseases. People who taste wine or carbonated drinks on a daily basis, as well as the people who are professionally engaged in swimming can spot this type of defect on their own teeth. Evaporation of industrial acids in battery factories, sanitary materials, or crystalline glass can also lead to dental erosions. Aim: The purpose of this study was to determine the frequency of dental erosion in patients under antihypertensive therapy and compare them with the frequency of dental erosion in patients who did not take the same therapy. Material and method: This research involved 62 respondents, aged from 20 to 70. Patients were classified into two groups, the experimental group with 31 patients being on a therapy with antihypertensive medications for more than 5 years, and the other one, control group, with 31 patients not being on the mentioned therapy. The subjective dental anamnesis obtained from the patients was noted along with tooth status, soft tissue intraoral examination and the degree of erosive changes according to BEWE index (Basic Erosive Wear Examination). Results: Comparing the statistical significance in difference between erosive index value of all teeth, there is obvious statistical difference of the average value. In the experimental group (p0.05), higher values of tooth erosion index were noted in comparison with the control group. The average value in the experimental group is 2.25, while in the control group it is 1.37. Conclusion: Erosive lesions are present in both experimental and control group respondents, with dental erosion being more explicit with patients who use antihypertensive medications.","PeriodicalId":10617,"journal":{"name":"Contemporary Materials","volume":"107 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78347788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

SOME OF BENEFITS NANOMATERIALS APPLICATIONS IN MEDICINE 纳米材料在医学上的一些应用

Contemporary Materials Pub Date : 2019-01-10 DOI: 10.7251/comen1901028p

S. Pelemiš, D. Mirjanić, D. Đeorđić, Ozren Petrović

{"title":"SOME OF BENEFITS NANOMATERIALS APPLICATIONS IN MEDICINE","authors":"S. Pelemiš, D. Mirjanić, D. Đeorđić, Ozren Petrović","doi":"10.7251/comen1901028p","DOIUrl":"https://doi.org/10.7251/comen1901028p","url":null,"abstract":"Nanotehnology applied to biomedicine has an important place in research of nanomaterials. Size of nanomaterials particles is similar to the size of biological molecules and structures, a conclusion can be drawn that the application of nanomaterials in vivo and in vitro biomedical researches is possible. This paper is a short overview of medical applications of different nanomaterials such as carbon nanotubes, graphene, quantum dots, nanocapsules etc. The main nanocarriers systems such as liposomes, micelles and dendrimers also will be presented. Today, we are witnessing the great boom of magnetic particles as essential components in several areas of medical practice. The great advantages of using nanomaterials in biomedical areas lies in their ability to operate on the same small scale as all the intimate biochemical functions involved in the growth, development and ageing of the human body. Nano-pharamceuticals reveal enormous potential in drug delivery as carrier for spatial and temporal delivery of bioactive components and diagnostics. Additionally, it also provides smart materials for tissue engineering. This discipline is now well-established for drug delivery, diagnostics, prognostic and treatment of diseases through its nanoengineered tools.","PeriodicalId":10617,"journal":{"name":"Contemporary Materials","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75813302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

QUALITY CONTROL OF DISTILLED WATER USED FOR RECONSTITUTION OF POWDERS FOR ORAL SUSPENSION IN PHARMACIES ON THE TERRITORY OF BOSNIA AND HERZEGOVINA 波斯尼亚和黑塞哥维那境内药房用于重组口服悬浮液粉末的蒸馏水的质量控制

Contemporary Materials Pub Date : 2019-01-10 DOI: 10.7251/comen1901047v

Ž. Gagić, Irena Kasagić Vujanović, Nina Okuka, D. Knezevic

{"title":"QUALITY CONTROL OF DISTILLED WATER USED FOR RECONSTITUTION OF POWDERS FOR ORAL SUSPENSION IN PHARMACIES ON THE TERRITORY OF BOSNIA AND HERZEGOVINA","authors":"Ž. Gagić, Irena Kasagić Vujanović, Nina Okuka, D. Knezevic","doi":"10.7251/comen1901047v","DOIUrl":"https://doi.org/10.7251/comen1901047v","url":null,"abstract":"In this paper, presented are the results of quality control of distilled water used for the reconstitution of powders for oral suspension usually intended for pediatric population. By reviewing the legislation, there is no clearly defined shelf life and storage instruction for this type of water. The conducted analyses confirmed that some pharmacies on the territory of Bosnia and Herzegovina use technical distilled water (water for accumulators, iron and antifreeze dilution), but also distilled water that does not meet quality requirements prescribed by European Pharmacopoeia. The tested water samples did not have adequately labeled packaging (production time and shelf life). The results showed that out of a total of 10 samples, 2 had conductivity greater than permissible, 3 had an exceeded limit for heavy metals, and 2 of the samples showed the presence of oxidisable substances. Out of all tested samples, only one sample met microbiological criteria for purified water. Based on the results of these analyses, it can be assumed that in many pharmacies around the country, inadequate distilled water is used which could endanger the stability of the pharmaceutical preparation and the safety of the patient. Bearing in mind that antibiotic oral suspensions are prescribed from the age of the infant, and that a large number of children consume these products for a long period due to frequent infections, the question arises as to whether prepared drugs accomplish their purpose and whether pharmacists are sufficiently aware of the importance of the quality of this type of water?","PeriodicalId":10617,"journal":{"name":"Contemporary Materials","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89785886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

GADOLINIUM SORPTION ON MULTI-WALLED CARBON NANOTUBES 多壁碳纳米管对钆的吸附

Contemporary Materials Pub Date : 2019-01-10 DOI: 10.7251/comen1901035m

D. Maksin, M. Vukčević, Tatjana Đurkić, Ivana Stanišić, T. Bakić, Milena Radomirović, A. Onjia

引用次数: 1

NON-CONTACT DIELECTRIC MEASUREMENTS ON POLYMER FILMS 聚合物薄膜的非接触介电测量

Contemporary Materials Pub Date : 2019-01-10 DOI: 10.7251/comen1901001s

B. Škipina, A. S. Luyt, D. Dudić

引用次数: 0