The pa per dis cusses the pos si bil ity of im prov ing the char ac ter of gas surge ar rest ers. Ex am ined were: the mag netic field ef fect, the ef fect of the hol low cath ode, and the ef fect of the al pha ra di a tion source 241Am. Nu mer i cal and real ex per i ments con ducted are pre sented to gether with the o ret i cal in ter pre ta tions of the ob tained re sults. Real ex per i ments were car ried out on a model of a gas surge ar rester spa tially con structed for ex per i ments pre sented in this pa per. The model was de signed in such a way that it was pos si ble to change all the rel e vant pa ram e ters of the gas surge ar rester model. Ex per i ments were con ducted un der well-con trolled lab o ra tory con di tions. The tests were per formed with d. c. and im pulse volt age. The re sults ob tained by ex per i ments were pro cessed by so phis ti cated sta tis ti cal meth ods. The ex pressed mea sure ment un cer tainty of the ex per i men tal pro ce dure showed a high sta tis ti cal re li abil ity of the ob tained re sults. Based on the re sults of the re search, the model of a gas surge ar rester, in which the ef fect of the hol low cath ode and the ra dio ac tive source 241Am were com bined, un am big u ously proved to have the best char ac ter is tics.

In this article the summary of measurement and calculation values of low frequency electric field radiation around the high-voltage transmission lines and impact of the increased voltage values on the AC corona onset voltage gradient are presented. The measurements of the low frequency electric field radiation level were performed under the 400 kV transmission lines of horizontal configuration with standard and compact dimensions. In all cases analyzed in this article, the measurements are performed in the middle of the span, because at this point the conductors are closest to the ground. The analysis in this article has been initiated by the increased voltage values of long duration that have been registered in nodes of the 400 kV network in Bosnia and Herzegovina and the neighbouring countries during the last years. The calculation of the low frequency electric field radiation of the different configuration of the high-voltage transmission lines will be useful for determining the non-ionization radiation exposure levels of the general public in the future as well as to determine their impact on the AC corona onset voltage gradient.

Термин „портфолио анализа”, који је у економску теорију увео Хари Марковиц (Harry Markowitz), није нов у стручној литератури Међутим, у радовима домаћих или страних аутора, анализе и критике се углавном базирају на примјеру развијених тржишта капитала. Ријетки су случајеви примјене портфолио анализе на домаће тржиште капитала. У раду ћемо се фокусирати на примјену диверзификације на акције на Бањалучкој берзи. Користећи Марковицев метод портфолио селекције, доказаћемо да је ефекат диверзификације, уз сва ограничења, на домаћем тржишту могућ и примјенљив.

Из малог броја емитованих корпоративних обвезница од настанка Ба-њалучке берзе до данас, очигледно је да је домаће тржиште корпоратив-них обвезница у почетној фази развоја. Предмет овог рада је дефинисањепретпоставки и ограничења, односно могућности развоја тржишта кор-поративних обвезница у Републици Српској. Успјешан развој тржишта об-везница, осим институционалним и законским претпоставкама, у великојмјери је условљен спремношћу привредних друштава да емитују обвезнице.С друге стране, нужна је и опредијељеност инвеститора да улажу у те хар-тије од вриједности.Циљ истраживања је да испитамо потенцијалну понуду и (потенцијал-ну) потражњу у периоду од наредне три године. Истраживање је проведенометодом анкетног испитивања у два дијела. У првом дијелу анкетиранису менаџери у институционалним инвеститорима на домаћем тржишту:инвестициони фондови, осигуравајућа друштва и банке, њих 42. У другомдијелу испитивали смо најзначајнија акционарска друштва на Бањалучкојберзи, она која су била у саставу индекса BIRS и она која су исплаћиваладивиденду, њих 66. Резултати истраживања показују који број привреднихдруштава је спреман да финансира своје пословање емитовањем обвезница,те који број инвеститора би улагао у те инструменте. Осим тога указа-ћемо на препреке развоју и продубљивању тржишта те на стваран бројинституционалних инвеститора који би улагао у корпоративне обвезнице.

OBJECTIVE To investigate clinical parameters of anterior cervical discectomy and fusion (ACDF) treatment and outcomes using osseous allografts in different age groups, study the postoperative results of restoration of lordosis, and evaluate the utility of bone allografts for ACDF, including graft subsidence. METHODS We reviewed data from 154 patients with clinical symptoms and radiologic signs of disc herniation and/or cervical spondylosis. Decompression was achieved through discectomy, osteophyte ablation, endplate drilling, and foraminotomy. Fusion was achieved with allografts, demineralized bone matrix, and cervical plates/screws. The relationships between preoperative and postoperative cervical spine configuration (ie, Benzel's criteria), pain intensity, and neurologic status were analyzed. RESULTS The mean patient age was 51 years, and the median duration of symptoms was 6 months. The mean age differed significantly between the patients with diabetes and those without diabetes. The mean body mass index (BMI) was 30.36. Fifty-two patients had disc herniation, and 102 had spondylosis. Surgery was performed on a total of 313 levels. The median duration of follow-up was 24 months. Marked improvements in postoperative spine configuration or preservation of lordosis were recorded. Overall, 122 patients were neurologically intact, and 32 patients experienced residual postsurgery neurologic deficits (minor, n = 22; moderate, n = 9; severe, n = 1). Postoperative pain intensity and neurologic status were significantly improved. Outcomes were excellent in 66 patients, good in 61, fair in 24, and poor in 3 (no mortality). No significant differences in patient age, smoking habits, diabetes, or BMI were seen among outcomes, or between patients with soft disc herniation or spondylosis. CONCLUSIONS Osseous allografting can excellently restore cervical lordosis regardless of age and is an excellent graft choice for ACDF. Patients of advanced age with comorbidities should not be denied surgery.

Tuberculous meningitis (TBM) is a severe consequence of Mycobacterium tuberculosis infection. Early clinical manifestations are often non-specific. In this case study, we showed tuberculous meningitis with tuberculous granulomas in a female patient during and after pregnancy, with all diagnostic and therapeutic dilemmas we had during her treatment. The patient was treated for 18 months. Our diagnostic findings showed extended pleocytosis and high protein level in cerebrospinal fluid (CSF), development of tuberculous granulomas in brain with relatively low inflammation parameters. Since it has been only a several days from the onset of the first symptoms to the beginning of treatment, the first signs of recovery showed very soon, despite development of the tuberculous granulomas. In the first 12 months tuberculostatic (TS) treatment was continuous, but after that period, treatment was intermittent for the next 6 months. After the treatment, a patient’s clinical and neurological status was normal as well as CSF analysis and neuroradiological findings. Olja Čuković1 Antonija Verhaz1 Tatjana Roganović1 Irena Katan1 Zorislava Bajić2 1 Klinika za infektivne bolesti UKC RS Banja Luka, BiH 2 Medicinski fakultet Univerziteta u Banja Luci, BiH Prikaz bolesnika/Case report Adresa za dopisivanje: Olja Čuković e-mail: olja.cukovic@kc-bl.com Ključne riječi: tuberkuloza tuberkulozni meningitis tuberkulozni granulom