The structure correction,of “8-hydroxysub-spinosin” and synthesis of 5-hydroxy-damnacanthol-ω-ethyl ether

8-Hyaroxysubspinosin was elucidated as 2,8-dihydroxy-3-ethoxymethyl-1-methoxy- anthraquinone(2)in the literature.Here,the structure revision and synthesis of 8-hydroxysubspinosin were presented.It should be revised to 3,5-dihydroxy-2-ethoxymethyl-1-methoxyanthraquinone (5),i.e.5-hydroxydamnacanthol-ω-ethyl ether by comparison with the synthetic sample.5 was syn- thesized by alkylation of 3-bromo-7-methoxyphthalide(10)with 2,6-dimethoxytoluene in the presence of stannic chloride,followed by reductive clcavagc,cyclization,oxidation,demethylation,selective acetylation,methylation,bromination and condensation with sodium ethoxide.The isomer 1,3- dihydroxy-2-ethoxymethyl-5-methoxyanthraquinone(5b)was also obtained.

An approach to improving maneuver performance of coning algorithm

Aiming to improve the maneuver performance of the strapdown inertial navigation attitude coning algorithm a new coning correction structure is constructed by adding a sample to the traditional compressed coning correction structure. According to the given definition of classical coning motion the residual coning correction error based on the new coning correction structure is derived. On the basis of the new structure the frequency Taylor series method is used for designing a coning correction structure coefficient and then a new coning algorithm is obtained.Two types of error models are defined for the coning algorithm performance evaluation under coning environments and maneuver environments respectively.Simulation results indicate that the maneuver accuracy of the new 4-sample coning algorithm is almost double that of the traditional compressed 4-sample coning algorithm. The new coning algorithm has an improved maneuver performance while maintaining coning performance compared to the traditional compressed coning algorithm.

First-principles study of structrural and corrected band properties of wurtzite Zn_(1-x)Cd_xO and Zn_(1-x)Mg_xO systems

A first-principles method based on density functional theory （DFT）,a generalized gradient approximation （GGA）,and a projector-augmented wave （PAW） are used to study the structual and band properties of wurtzite Zn1-xCdxO and Zn1-xMgxO （0 ≤ x ≤ 1） ternary alloys.By taking into account all of the possible structures,the band gaps of Zn1-xCdxO and Zn1-xMgxO alloys are corrected and compared with experimental data.

Measurement of Metallogenic Depth and Deep Second Enrichment Belt Forecasting in Jiaodong Gold Deposit

The depth is important for ore finding in Jiaodong gold deposit. However, many geologists are still discussing how to confirm the depth for the tectonic and metallogenesis formation. The authors of this paper propose a new method-the correction of metallogenic depth via its structure to calculate the depth. This method, based on the crust rock in a solid stress state, emphasizes the elastic pattern rather than the static fluid pattern. In addition, this method is more appropriate to the actual situation in the crust than the method of weight/special weight. The authors of this paper illustrating, with the Jiaodong gold deposit as an example, the metallogenic depth correction via structure conclude that the depth of the most deposits, lower than 4-6 km, is often 2.5 km. Therefore, the authors suggest that there exists a second enrichment belt and that ore resources are more potential at the belt of Jiaodong area. These results have been demonstrated by years of exploration.

Light field head-mounted display with correct focus cue using micro structure array

A new type of light fiehl display is proposed using a head-mounted display （HMD） and a micro structure array （MSA, lens array or pinhole array）. Each rendering point emits abundant rays from different directions into the viewer＇s pupil, and at one time the dense light field is generated inside the exit pupil of the HMD through the eyepiece. Therefore, the proposed method not only solves the problem of accommodation and convergence conflict in a traditional HMD, but also drastically reduces the huge data in real three-dimensional （3D） display. To demonstrate the proposed method, a prototype is developed, which is capable of giving the observer a real perception of depth.