Slope excavation quality assessment and excavated volume calculation in hydraulic projects based on laser scanning technology

Slope excavation is one of the most crucial steps in the construction of a hydraulic project. Excavation project quality assessment and excavated volume calculation are critical in construction management. The positioning of excavation projects using traditional instruments is inefficient and may cause error. To improve the efficiency and precision of calculation and assessment, three-dimensional laser scanning technology was used for slope excavation quality assessment. An efficient data acquisition, processing, and management workflow was presented in this study. Based on the quality control indices, including the average gradient, slope toe elevation, and overbreak and underbreak,cross-sectional quality assessment and holistic quality assessment methods were proposed to assess the slope excavation quality with laserscanned data. An algorithm was also presented to calculate the excavated volume with laser-scanned data. A field application and a laboratory experiment were carried out to verify the feasibility of these methods for excavation quality assessment and excavated volume calculation. The results show that the quality assessment indices can be obtained rapidly and accurately with design parameters and scanned data, and the results of holistic quality assessment are consistent with those of cross-sectional quality assessment. In addition, the time consumption in excavation quality assessment with the laser scanning technology can be reduced by 70%e90%, as compared with the traditional method. The excavated volume calculated with the scanned data only slightly differs from measured data, demonstrating the applicability of the excavated volume calculation method presented in this study.

Research on the quality control technology for the Astragalus membranaceus extraction solution in cosmetics

Calycosin-7-glucoside,which is the target ingredient of the Astragalus membranaceus extraction solution,was studied by the high-performance liquid chromatography-diode array detector method(HPLC-DAD),and a high-performance liquid chromatography-electrospray ionization detector method(HPLC-CAD)was also established for fingerprint chromatogram analysis.Meanwhile,the heavy metal content was tested to build a quality control standard for Astragalus membranaceus extraction solution.Result shows a good linearity in 4-80μg/mL mass concentration range with the correlation coefficient r=0.999,RSD=2.4%,and the recovery rate is between 99.2%-102.7%.The fingerprint chromatogram analysis features with 14 specific peaks,including 5 identified components.The similarity is between 0.485 to 0.995.Content of heavy metals such as lead,mercury,and cadmium are below the detection limit,and the content of arsenic is less than 2 mg/kg.This research results can serve as process optimization basis and quality control standards for Astragalus membranaceus extraction solution,and provide reference to quality control and research guideline for other cosmetics using herbal extracts as raw materials.

Offering English and American Literature Optional Courses to Enhance Humanistic Qualities of Students in Universities of Science and Technology

Recently, the universities of science and technology pay more attention to their own specialized subjects and tak, little notice of humanities. This phenomenon results in the weakness of college students＇ humanistic qualities, Therefore, cultivating and enhancing students＇ humanistic qualities in universities of science and technolog become the main issues that are viewed intensively by the current educational circles. This paper analyzes th, current situation of English and American literature optional courses in universities of science and technolog3, gives the importance of offering the optional courses of English and American literature, and analyzes the activ roles and important significance of optional courses of English and American literature in the course of humanisti qualities of students in universities of science and technology. This paper also gives the necessities and ne~ methods of giving the optional courses of English and American literature under the circumstances of colleg, English teaching reform

大连市领导干部科技素质的调查报告

With the method of questionary, the author has carried out careful investigation concerning the qualities of science and technology of Dalian municipal leading officials. It has basiclly reflected the degree of understanding and grasping of the policies and knowledge of science and technology by the leading officials in Dalian municipal organizations and cause units. Some of the questions have been proved by the experts which have rather strong effectiveness and comparably.

A 10-MHz SOI-Based Face Shear Square Micromechanical Resonator

A 10-MHz face shear （FS） square micro- mechanical resonator based on silicon-on-insulator （SO1） technology is presented in this paper. In order to examine the improvement of quality factor as well as motional resistance Rx in this structure, the center-stem anchor is employed in this study. The benefit of anchoring the square in the center, which is the nodal point, is that the energy losses through the anchor can be minimized. Hence, a quality factor value of 2.0 million and the motional resistance of 8.2 k~ can be obtained with an FS mode resonator via finite element （FE） simulation. The results show the significance of the FS mode in this design, not only in its structure but also in its square-extensional mode and Lame-mode. Additionally, an SOI-based fabrication process is proposed to support the design.

Performance of pond–wetland complexes as a preliminary processor of drinking water sources

Shijiuyang Constructed Wetland（110 hm^2） is a drinking water source treatment wetland with primary structural units of ponds and plant-bed/ditch systems. The wetland can process about 250,000 tonnes of source water in the Xincheng River every day and supplies raw water for Shijiuyang Drinking Water Plant. Daily data for 28 months indicated that the major water quality indexes of source water had been improved by one grade. The percentage increase for dissolved oxygen and the removal rates of ammonia nitrogen, iron and manganese were 73.63%, 38.86%, 35.64%, and 22.14% respectively. The treatment performance weight of ponds and plant-bed/ditch systems was roughly equal but they treated different pollutants preferentially. Most water quality indexes had better treatment efficacy with increasing temperature and inlet concentrations. These results revealed that the pond–wetland complexes exhibited strong buffering capacity for source water quality improvement. The treatment cost of Shijiuyang Drinking Water Plant was reduced by about 30.3%. Regional rainfall significantly determined the external river water levels and adversely deteriorated the inlet water quality, thus suggesting that the ＂hidden＂ diffuse pollution in the multitudinous stream branches as well as their catchments should be the controlling emphases for river source water protection in the future. The combination of pond and plant-bed/ditch systems provides a successful paradigm for drinking water source pretreatment. Three other drinking water source treatment wetlands with ponds and plant-bed/ditch systems are in operation or construction in the stream networks of the Yangtze River Delta and more people will be benefited.