ON SOME CLASSES OF ℝ-COMPLEX HERMITIAN FINSLER SPACES

Aldea, Nicoleta,Campean, Gabriela Korean Mathematical Society 2015 대한수학회지 Vol.52 No.3

In this paper, we investigate the $\mathbb{R}$-complex Hermitian Finsler spaces, emphasizing the differences that separate them from the complex Finsler spaces. The tools used in this study are the Chern-Finsler and Berwald connections. By means of these connections, some classes of the $\mathbb{R}$-complex Hermitian Finsler spaces are defined, (e.g. weakly K$\ddot{a}$hler, K$\ddot{a}$hler, strongly K$\ddot{a}$hler). Here the notions of K$\ddot{a}$hler and strongly K$\ddot{a}$hler do not coincide, unlike the complex Finsler case. Also, some kinds of Berwald notions for such spaces are introduced. A special approach is devoted to obtain the equivalence conditions for an $\mathbb{R}$-complex Hermitian Finsler space to become a weakly Berwald or Berwald. Finally, we obtain the conditions under which an $\mathbb{R}$-complex Hermitian Finsler space with Randers metric is Berwald. We get some clear examples which illustrate the interest for this work.

ON THE CLASS OF COMPLEX DOUGLAS-KROPINA SPACES

Aldea, Nicoleta,Munteanu, Gheorghe Korean Mathematical Society 2018 대한수학회보 Vol.55 No.1

In this paper, considering the class of complex Kropina metrics we obtain the necessary and sufficient conditions that these are generalized Berwald and complex Douglas metrics, respectively. Special attention is devoted to a class of complex Douglas-Kropina spaces, in complex dimension 2. Also, some examples of complex Douglas-Kropina metrics are pointed out. Finally, the complex Douglas-Kropina metrics are characterized through the theory of projectively related complex Finsler metrics.

ON COMPLEX FINSLER SPACES WITH RANDERS METRIC

Aldea, Nicoleta,Munteanu, Gheorghe Korean Mathematical Society 2009 대한수학회지 Vol.46 No.5

In this paper we introduce in study a new class of complex Finsler spaces, namely the complex Randers spaces, for which the fundamental metric tensor and the Chern-Finsler connection are determined. A special approach is devoted to $K{\ddot{a}}ahler$-Randers metrics. Using the length arc parametrization for the extremal curves of the Euler-Lagrange equations we obtain a complex nonlinear connections of Lorentz type in a complex Randers space.

On complex Finsler spaces with Randers metric

Nicoleta Aldea,Gheorghe Munteanu 대한수학회 2009 대한수학회지 Vol.46 No.5

In this paper we introduce in study a new class of complex Finsler spaces, namely the complex Randers spaces, for which the fundamental metric tensor and the Chern-Finsler connection are determined. A special approach is devoted to Kähler-Randers metrics. Using the length arc parametrization for the extremal curves of the Euler-Lagrange equations we obtain a complex nonlinear connections of Lorentz type in a complex Randers space. In this paper we introduce in study a new class of complex Finsler spaces, namely the complex Randers spaces, for which the fundamental metric tensor and the Chern-Finsler connection are determined. A special approach is devoted to Kähler-Randers metrics. Using the length arc parametrization for the extremal curves of the Euler-Lagrange equations we obtain a complex nonlinear connections of Lorentz type in a complex Randers space.

ON SOME CLASSES OF R-COMPLEX HERMITIAN FINSLER SPACES

Nicoleta Aldea,Gabriela Cˆampean 대한수학회 2015 대한수학회지 Vol.52 No.3

In this paper, we investigate the R-complex Hermitian Finsler spaces, emphasizing the differences that separate them from the complex Finsler spaces. The tools used in this study are the Chern-Finsler and Berwald connections. By means of these connections, some classes of the R-complex Hermitian Finsler spaces are defined, (e.g. weakly K¨ahler, K¨ahler, strongly K¨ahler). Here the notions of K¨ahler and strongly K¨ahler do not coincide, unlike the complex Finsler case. Also, some kinds of Berwald notions for such spaces are introduced. A special approach is devoted to obtain the equivalence conditions for an R-complex Hermitian Finsler space to become a weakly Berwald or Berwald. Finally, we obtain the conditions under which an R-complex Hermitian Finsler space with Randers metric is Berwald. We get some clear examples which illustrate the interest for this work.

On the class of complex Douglas-Kropina spaces

Nicoleta Aldea,Gheorghe Munteanu 대한수학회 2018 대한수학회보 Vol.55 No.1

In this paper, considering the class of complex Kropina metrics we obtain the necessary and sufficient conditions that these are generalized Berwald and complex Douglas metrics, respectively. Special attention is devoted to a class of complex Douglas-Kropina spaces, in complex dimension $2 $. Also, some examples of complex Douglas-Kropina metrics are pointed out. Finally, the complex Douglas-Kropina metrics are characterized through the theory of projectively related complex Finsler metrics.

Heat Treatment Influence on the Structural Properties of Supported Ni Nanoclusters

Vasile Rednic,Nicolae Aldea,Petru Marginean,Marius Rada,Adrian Bot,Zhonghua Wu,Zhang Jing,Florica Matei 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.4

Ni nanoclusters supported on Al2O3 were prepared using a coprecipitation method. A heat treatment at differenttemperatures was applied. The obtained samples were analyzed by X-ray diffraction (XRD), X-rayabsorption spectroscopy and X-ray photoelectron spectroscopy in order to determine their global, local andelectronic structures. The average particle size, the mean squares of the microstrain, the particle size andmicrostrain distribution functions of the supported Ni nanoclusters were determined by the XRD methodusing a generalized Fermi function for the approximation of the X-ray line. The recrystallization inducedduring the heat treatment process was analyzed. The present study indicated strong deformation of thelocal structure of the active metal in all of the samples investigated due to the metal-support interactionand the effects of the small particle size. Electronic structural investigations showed the presence of Ni ina metallic state as well as Ni2+ on the cluster surfaces.

Green tea extract addition into a Tris-based egg yolk extender improves Bali bull sperm quality

Prastiya Ragil Angga,Suprayogi Tri Wahyu,Debora Aldea Erian,Wijayanti Ani,Amalia Anny,Sulistyowati Deny,Nugroho Aras Prasetiyo 아세아·태평양축산학회 2023 Animal Bioscience Vol.36 No.2

Objective: The conservation of Bali bulls, the Indonesian native breed of cattle, is crucial for cattle breeding in Indonesia. To guarantee the spread of Bali bulls through artificial insemination the quality of the frozen semen must be high. To this end, adding an extender material to semen that increases spermatozoa’s survival during cryopreservation is important. Green tea extract (GTE) can be used as cryoprotectant because its high antioxidant activity can help avoid reactive oxygen species formation. Methods: Semen of five Bali bulls from the National Artificial Insemination Center at Singosari, Indonesia was collected routinely twice a week. First, fresh semen inspection was performed to determine the feasibility of using Bali bulls as animal samples. The extender used in this study was Tris-based egg yolk. The samples were divided into four treatments: T0, no GTE added to the extender; T1, 0.05 mg GTE plus 100 mL extender; T2, 0.10 mg GTE plus 100 mL extender; and T3, 0.15 mg GTE plus 100 mL extender. The semen freezing process was conducted according to standard procedures and sperm quality parameters, i.e., sperm motility, viability, abnormalities, and membrane integrity observed pre-freezing and post-thawing. Results: There were significant differences in total motility, progressive motility, viability, and integrity membrane of Bali bull sperm at both pre-freezing and post-thawing after adding GTE into the extender. In contrast, there were no differences in abnormalities among treatments. Conclusion: Adding GTE at a 0.15 mg into 100 mL Tris-based egg yolk extender can improve the quality of cryopreserved Bali bull sperm.