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Introduction: Among 14 species of forest skinks (genus Sphenomorphus) in Vietnam, seven were recorded from southern part of the country. Shea’s forest skink, S. sheai, was described from Kon Tum Plateau based on a single female. Similarly, the tridigital forest skink, S. tridigitus, was also described based on a single putrid and desiccated specimen found dead on a road in Bach Ma; specimens collected recently in Laos did not fully agree with the original description. Hence, additional specimens from type localities of both poorly known species are necessary to discern their morphological variation. In addition, little is known about hemipenis and distribution of the other forest skinks in southern Vietnam. Our study seeks to (1) confirm the occurrence of all known species in the area and access their distributions, (2) provide additional morphological data on poorly known S. sheai and S. tridigitus, and (3) describe hemipenial structure of known species. Methods: We analyzed the morphology of 47 specimens of forest skink collected from southern Vietnam to identify species. Scales were observed and counted under a zoom stereo microscope and measurements were taken with a digital caliper. Results: Analyses confirmed the occurrence of seven species of Sphenomorphus in southern Vietnam, including S. annamiticus, S. buenloicus, S. indicus, S. maculatus, S. sheai, S. tridigitus, and S. yersini. New specimens of S. sheai had one enlarged anterior temporal and eight or nine lamellae under fourth toe, which differed from the original description. Additional specimens of S. tridigitus from the type locality verified that the holotype has 20 mid-body scale rows and first supralabial and nasal fused, but they differed from the holotype in having upper temporal overlapped or overlapping the lower one. Fieldwork discovered 20 new localities for all seven species. The hemipenes of four species involved those with symmetric and asymmetric lobes. Conclusion: We confirm the occurrence of seven species of Sphenomorphus in southern Vietnam with 20 additional distribution records. Hemipenial structures of known species form two groups. New specimens of S. sheai and S. tridigitus differ slightly from the holotypes.

The forecasting models by traditional regression function have the crisp functions such as Y=f(x1, x2 ,….,xn) or logY=f(logx1, logx2 ,….,logxn). Here f has the linear form and xi are the factors such as GDP, temperature, industrial output, population… But these models are able to be used only when the linear correlation existed (expressed by the correlation coefficient). This paper introduced the regression model based on the fuzzy Takagi-Sugeno rules. These rules are built by using the subtractive clustering. The model is used for the general case, even when there are no the crisp function f. Examining shows that the good results are obtained in the case of traditional correlation such as linear or linear by logarithm. The results are also satisfactory for the case of unknown correlation. The electricity consumption forecasting due to the temperature factor for one substation of HochiMinh city was carried out.

Ultra high strength self compacting concrete (UHSSCC) with high filling ability, passing ability, segregation resistance and ultra high compressive strength have been used in many modern construction project. This paper represents the optimization of concrete composition for ultra high strength self compacting concrete, ỉn this experiment, river sand and crush stone were used as fine aggregate, Dmax of coarse aggregate is 10 mm. The study show that slump flow was 525 mm up to 850 mm and compressive strength was 140 MPa up to 170 MPa.