New scale factor correction scheme for CORDIC algorithm

To overcome the drawbacks such as irregular circuit construction and low system throughput that exist in conventional methods, a new factor correction scheme for coordinate rotation digital computer（ CORDIC） algorithm is proposed. Based on the relationship between the iteration formulae, a new iteration formula is introduced, which leads the correction operation to be several simple shifting and adding operations. As one key part, the effects caused by rounding error are analyzed mathematically and it is concluded that the effects can be degraded by an appropriate selection of coefficients in the iteration formula. The model is then set up in Matlab and coded in Verilog HDL language. The proposed algorithm is also synthesized and verified in field-programmable gate array （FPGA）. The results show that this new scheme requires only one additional clock cycle and there is no change in the elementary iteration for the same precision compared with the conventional algorithm. In addition, the circuit realization is regular and the change in system throughput is very minimal.

Semi-empirical modeling of volumetric efficiency in engines equipped with variable valve timing system

Volumetric efficiency and air charge estimation is one of the most demanding tasks in control of today's internal combustion engines.Specifically,using three-way catalytic converter involves strict control of the air/fuel ratio around the stoichiometric point and hence requires an accurate model for air charge estimation.However,high degrees of complexity and nonlinearity of the gas flow in the internal combustion engine make air charge estimation a challenging task.This is more obvious in engines with variable valve timing systems in which gas flow is more complex and depends on more functional variables.This results in models that are either quite empirical(such as look-up tables),not having interpretability and extrapolation capability,or physically based models which are not appropriate for onboard applications.Solving these problems,a novel semi-empirical model was proposed in this work which only needed engine speed,load,and valves timings for volumetric efficiency prediction.The accuracy and generalizability of the model is shown by its test on numerical and experimental data from three distinct engines.Normalized test errors are 0.0316,0.0152 and 0.24 for the three engines,respectively.Also the performance and complexity of the model were compared with neural networks as typical black box models.While the complexity of the model is less than half of the complexity of neural networks,and its computational cost is approximately 0.12 of that of neural networks and its prediction capability in the considered case studies is usually more.These results show the superiority of the proposed model over conventional black box models such as neural networks in terms of accuracy,generalizability and computational cost.

Ectopic papilla of Vater in the pylorus

The major papilla of Vater is usually located in the second portion of the duodenum, to the posterior medial wall. Sometimes the mouth of the biliary duct is located in other areas. Drainage of the common bile duct into the pylorus is extremely rare. A 73-year old man, with a history of duodenal ulcer, was admitted to hospital with the diagnosis of cholangitis. Dilatation of the extrahepatic biliary duct was observed by abdominal ultrasonography, and endoscopic retrograde cholangiopancreatography （ERCP） was performed. No area suggesting the presence of the papilla of Vater was found within the second duodenal portion. Finally the major papilla was located in the theoretical pyloric duct. Cholangiography was performed and choledocholithiasis was found in the biliary tree. The patient underwent dilatation of the papilla with a balloon tyre and removal of a 7 mm stone using a Dormia basket, which solved the problem without further complications. This anomaly increased the difficulty of performing therapeutic interventions during ERCR This alteration in anatomy may increase the risk of complications during papillotomy, with a theoretically higher risk of perforation. Dilatation using a balloon was the chosen therapeutic technique both in our case and in the literature, due to its low rate of complications.

The Relative Deprivation Theory and Yemen＇s Uprising

The political upheavals in the Arab world during 2011 challenged the political status quo and have irrevocably paved the way toward transformation in the Middle East and North Africa （MENA）, The longstanding structural impediments to equitable growth and social justice afflicting the Arab world came to a head through a combination of persistently poverty, high unemployment, particularly among educated youth, rampant corruption, deficit of democratic governance, and essential freedoms. Yemen is the third country of the Middle Eastern countries which turmoil sparked in. All the uprisings connote of social, political and economic discontent and frustration. The main question and issue of this paper is to answer： What conditions breed change to Yemen？ The paper spotlights ＂relative deprivation＂ of Ted Robert Gurr as the most relevant theory to illustrate roots of the Yemen uprising. Relative deprivation theory holds that instead of an absolute standard deprivation, a gap between expectations and reality leads men to political violence. Therefore, this study is to utilize relative deprivation theory to explain how socio-economic shortages （such as high unemployment and education, along with poverty） and political inefficiencies of the Yemen＇s authoritarian regime led to public and collective discontent and upheaval. The intervened variables such as ＂ethnicity, race, religion, and sexuality＂ and international parameters have not been considered,

Correlation Between Energy Transfer Rate and Atomization Energy of Some Trinitro Aromatic Explosive Molecules

An assumptive theoretical relationship is suggested to describe the property of molecular atomization energy and energy transfer rate in the initiation of explosions. To investigate the relationship between atomization energy and energy transfer rate, the number of doorway modes of explosives is estimated by the theory of Dlott and Fayer in which the rate is proportional to the number of normal mode vibrations. It was evaluated frequencies of normal mode vibrations of eight molecules by means of density functional theory （DFT） at the b3p86/6-31G（d,p） level. It is found that the number of doorway modes shows a linear correlation to the atomization energies of the molecules, which were also calculated by means of the same method. A mechanism of this correlation is discussed. It is also noted that in those explosives with similar molecular structure and molecular weight, the correlation between the atomization energy and the number of doorway modes is higher.

南薰绣楼民宿

坐标：中国,安徽,黄山住进古徽州的绣楼青青润润的石板路,斑斑驳驳的古民居。谜一样的古村落,谜一样的天空,谜一样的山野：雾漫雨飘,是烟雨水墨;朝晖夕霞,是浓墨重彩;入夜,或皓月当空,或星汉灿烂,更有蛙唱虫吟……南薰别墅建于清末民初。大门正对风光秀丽的南屏山,沐南风而薰然,因名之＂南薰＂。正厅明三间,宽敞明亮,木雕砖雕石雕精美。南薰别墅的绣楼,在徽派建筑中独具特色,融入西洋建筑元素,堪称中西合璧之典范。