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Semiconductor nanocrystals, such as quantum dots (QDs) and wires (QWs), often contain from a few thousands to more than 106 atoms. It has been a great challenge to calculate the electronic structure of these large nanosystems using self-consistent first-principles method. In this chapter, recent development of calculations of nanocrystal physical properties using the large-scale ab initio pseudopotential...
In computer game system, there always include four modules, which are Game show, Move generator, Evaluation functions and Search algorithm. In this paper, we study the four modules of Surakarta chess, which is one kind of computer chess game. Since the validity of Evaluation function is key to the performance of the entire game system, in this paper, using array to represent the chess board, we mainly...
In this paper, we use a three-dimensional heart model which is reconstructed by cloud points. As the need of post-processing such as adding ablation line and opening on the model, we have to subdivide the grid model. After analyzing the characters of the model, basing on the loop algorithm, we propose a method in which we subdivide a triangle into 16 triangles, and through the experiment we get a...
We describe recent coordinated observations of lightning and terrestrial gamma ray flashes (TGFs) that provide new insight into the detailed processes that generate this thunderstorm-driven high-energy radiation. These observations include lightning mapping array measurements of the structure and development of a lightning flash that produced a TGF, and high time resolution observations of the specific...
This research intended to explore the relationship between local residents' attitudes to ecotourism development and theirs demands in Zhangjiajie National Forest Park. The results indicated that residents' socio-demographic factors had a correlation with their perception of tourism impact; residents' community attachment had a correlation with their perception of tourism impact; residents' community...
We report the observations of two gigantic jets, one during daytime over sea and one at nighttime over land, in the context of detailed associated observations of lightning flash and discharge evolution provided by a variety of radio measurements.
Pressure drops through packed concrete spheres and crushed rocks were investigated by wind tunnel experiments. The diameters of concrete spheres were 0.041 m and 0.052 m, respectively. The mean particle size of the crushed rocks was 0.096 m. The experimental results show that the Ergun equation with revised coefficient values can be used to predict pressure drops through the coarse spherical particle...
This paper tests the relationship between diversification and corporate performance based on Chinese western agricultural listed companies. Regression results for a sample of Chinese western agricultural listed companies support the hypotheses that the relationship between diversification and corporate performance is positive, indicating diversification strategy can improve companies' performance.
This paper examines the relationship between diversification and business risk based on agricultural listed enterprises in China. Regression results for a sample of agricultural listed companies in China show that diversification can help spread unsystematic risk and increases systematic risk.
Establishing venture capital funds for university students is an important way to strengthen students' entrepreneurship education and help the right startup business. This paper proposes the necessity of establishing venture funds for university students and management method of students' venture funds. Results for a sample of Sichuan Agricultural University show that venture funds application is...
The removal of fine particles in coal-fired fumes was experimentally studied based on acoustic agglomeration. An experiment facility was designed and set up. In this facility, a fluidized bed coal combustor was used as fume generator, and an Electrical Low Pressure Impact or (ELPI) was used to measure the fine particle concentration and size distribution in the fumes. The results show that under the...
IEEE 802.15.4 defines the physical layer and medium access control sub-layer specifications for low-data-rate wireless connectivity devices with very limited battery consumption requirements typically operating in the personal operating space. Unlike traditional wireless networks, its unique characteristics, such as low-data-rate and guaranteed time slots (GTS), have brought unprecedented challenges...
This paper studies the single machine repair system, There are one unreliable machines and one unreliable servicing facility in the system. The servicing facility maintain the failure machines and may breakdown itself. The distributions of time lasting are exponential distributions. The servicing facility breakdown rates may be different between busy and idle time. The steady state and transient state...
Due to the large electronegativity of the oxygen, the ionization energies of acceptors in metal oxides such as ZnO is quite high, making p-type doping a great challenge for the full utilization of ZnO as optoelectronic materials. By analyzing the defect wavefunction characters, we propose several approaches to lower the acceptor ionization energy in ZnO by codoping acceptors with donor or isovalent...
In this paper, we consider the M/M/2 queueing system with service interruptions. The rates of server breakdown are different between busy time and idle time, and there is one repairman in the system. Using the transform method we obtain the steady-state probabilities of the states, the steady-state availability and the steady-state queueing length, give a new form of the condition for the existence...
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