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Open access

Wang Qian

Abstract

Croatia is a land endowed with rich and diversified natural and cultural tourist resources. Traveling around Croatia, I was stunned by its beauty. However, I noticed that there were few Chinese tourists in Croatia. How can we bring more Chinese tourists to Croatia? How can we make them happy and comfortable in Croatia? And, at the same time, how can we avoid polluting this tract of pure land? Based on first-hand research work, I make a SWOT analysis of the Chinese tourist source market of Croatia and put forward related countermeasures from the perspective of a native Chinese. The positioning of tourism in Croatia should be ingeniously packaged. I recommend developing diversified and specialized tourist products, various marketing and promotional activities, simple and flexible visa policies and regulations, and other related measures to further explore the Chinese tourist source market of Croatia.

Open access

R. Singh and V. Kumar

Abstract

The eigen value approach, following the Laplace and Hankel transformation has been employed to find a general solution of the field equations in a generalized thermo microstretch elastic medium for an axisymmetric problem. An infinite space with the mechanical source has been applied to illustrate the utility of the approach. The integral transformations have been inverted by using a numerical inversion technique to obtain normal displacement, normal force stress, couple stress and microstress in the physical domain. Numerical results are shown graphically

Open access

Marta Przychodnia, Ryszard Czajka and Wojciech Koczorowski

Abstract

The present paper aims at describing a source designed and constructed to generate an organic molecular beam under ultrahigh vacuum conditions. The presented construction solution of the evaporation source allows for independent deposition of three different kinds of molecules. The probability of molecules fragmentation is minimized by using a thermocouple being in contact with a molecular crucible, which enables precise temperature control. In addition, cleanness and molecular beam density are monitored using a quadrupole mass spectrometer and quartz microbalance, respectively. The operational parameters of the molecular source are optimized and deposition rates are measured for the coronene molecule in the sublimation temperature range between 430 K and 460 K. The analysis of scanning tunneling microscope images of the Si(1 1 1) 7 × 7 substrate covered with the sub-monolayer of coronene molecules and comparison with previously published data has been used for verification of the molecular source operation.

Open access

Klára Taufarová, Kateřina Havránková, Alice Dvorská, Marian Pavelka, Marek Urbaniak and Dalibor Janouš

Abstract

Net ecosystem production reflects the potential of the ecosystem to sequestrate atmospheric CO2. Daily net ecosystem production of a mountain Norway spruce forest of the temperate zone (Czech Republic) was determined using the eddy covariance method. Growing season days when the ecosystem was a CO2 source were examined with respect to current weather conditions. During the 2005, 2006, and 2007 growing seasons, there were 44, 65, and 39 days, respectively, when the forest was a net CO2 source. The current weather conditions associated with CO2 release during the growing seasons were: cool and overcast conditions at the beginning or end of the growing seasons characterized by a 3-year mean net ecosystem production of -7.2 kg C ha-1 day-1; overcast or/and rainy days (-23.1 kg C ha-1 day-1); partly cloudy and hot days (-11.8 kg C ha-1 day-1); and overcast and hot days (-13.5 kg C ha-1 day-1). CO2 release was the highest during the overcast or/and rainy conditions (84%, average from all years), which had the greatest impact during the major production periods. As forests are important CO2 sinks and more frequent weather extremes are expected due to climate change, it is important to predict future forest carbon balances to study the influence of heightened variability in climatic variables.

Open access

M.M. Nandeppanavar, M.N. Siddalingappa and H. Jyoti

Abstract

In the present paper, a viscoelastic boundary layer flow and heat transfer over an exponentially stretching continuous sheet in the presence of a heat source/sink has been examined. Loss of energy due to viscous dissipation of the non-Newtonian fluid has been taken into account in this study. Approximate analytical local similar solutions of the highly non-linear momentum equation are obtained for velocity distribution by transforming the equation into Riccati-type and then solving this sequentially. Accuracy of the zero-order analytical solutions for the stream function and velocity are verified by numerical solutions obtained by employing the Runge-Kutta fourth order method involving shooting. Similarity solutions of the temperature equation for non-isothermal boundary conditions are obtained in the form of confluent hypergeometric functions. The effect of various physical parameters on the local skin-friction coefficient and heat transfer characteristics are discussed in detail. It is seen that the rate of heat transfer from the stretching sheet to the fluid can be controlled by suitably choosing the values of the Prandtl number Pr and local Eckert number E, local viscioelastic parameter k* 1 and local heat source/ sink parameter β*

Open access

S. Mukherjee Roy, R. C. Thapliyal and S. S. Phartyal

combining speed and completeness of pine germination. Forest Science 8: 386-396. DEVAGIRI, G. M. (1997): Evaluaton of seed source variation in seed and seedling traits in Dalbergia sissoo Roxb. Ph.d. Thesis, FRI Deemed Univ., Dehradun, India, pp. 189. DONAHUE, J. K. and LOPEZ-UPTON, J. (1996): Geographical variation in leaves, cone and seeds of Pinus gregii in native forests. For. Ecol. Manage. 82: 145-157. DONALD, D. G. M. (1982): Plant characteristics affecting survival and early growth. 221-223 Sept., Mededeling

Open access

S. Sharma and K. Sharma

-4179(02)00104-3. Lienhard J.H. (1987): A Heat Transfer Textbook. - Prentice- Hall, Englewood Cliffs. Martin G.T., Bowman H.F. and Newman W.H. (1992): Basic element method for computing the temperature field during hyperthermia therapy planning. - Advanced Bio Heat Mass Transfer, vol.231, pp.75-80. Mochnacki B. and Majchrzak E. (2003): Sensitivity of the skin tissue on the activity of external heat sources. - Computer Modeling in Engineering and Sciences, vol.4, No.4, pp.431-438. Othman M.I., Ali M.G.S. and Farouk R.M. (2011): The effect of

Open access

Eugeniusz Ranatowski

Problems of welding in shipbuilding - an analytic-numerical assessment of the thermal cycle in Haz with three dimensional heat source models in agreement with modelling rules

This part is continuation of PART I. The basis of this analytic solution are the Fourier - Kirchhoff partial differential equation with appropriated boundary conditions. For a plate with optional thickness, the radiative heat transfer on both surfaces is taken into account. It is assumed that moving C-I-N or D-E heat sources during a very short period of time, generate an impulse of energy inducing an instantaneous thermal field in the plate area and the analytic solution is received by used Fourier transformation. These fields are being continuously summed up to obtain resultant thermal field . Finally, the temperature fields generated by C-I-N and D-E heat sources in both stationary and moving co-ordinates systems are established.

Open access

Bálint Stágel, Péter Tar and István Maros

References [1] A. Markhorin, „The GNU Programming Kit (GLPK). GNU Software Foundation,” 2015. [Online]. Available: http://www.gnu.org/software/glpk/glpk.html. [2] CoinOR, „COmputational INfrastructure for Operations Research,” 2015. [Online]. Available: http://www.coin-or.org/. [3] M. Berkelaar, K. Eikland és P. Notebaert, „lp_solve 5.5, open source (mixed-integer) linear programming system,” 2015. [Online]. Available: http://lpsolve.sourceforge.net/5.5/. [4] IBM, „IBM ILOG CPLEX Optimization

Open access

Bao-Ji Zhang and Zhu-Xin Zhang

. Hydrodynamic hull form design using an optimization technique. International Journal of Ocean System Engineering , 3(1), pp.1-9. Peri, D. and Campana, E.F., 2003. Multidisciplinary design optimization of a naval surface combatant. Journal of Ship Research , 47(1), pp.1-12. Suzuki, K. and Iokamori, N., 1999. Studies on minimization of wave making resistance based on Rankine source method. Journal of the Kansai Society of Naval Architects , 185, pp.9-19. Yang, G. and Lohner, R., 1998. Fully nonlinear ship wave calculation using unstructured grid and