Subjects: Engineering and technical science >> Technology of Instrument and Meter submitted time 2024-02-06
Abstract： The demodulation frequency of the demodulation system based on F-P filter is slow, and the demodulation error will be generated when the physical quantity with high change frequency is measured. Therefore, it is necessary to improve the demodulation frequency on the premise of ensuring the demodulation accuracy. To solve this problem, a demodulation system based on MEMS vibroscope is proposed, including the construction of a demodulation system based on MEMS vibroscope. The optical etalon is used to solve the problem that the driving voltage and output wavelength of the MEMS vibroscope have nonlinear errors that affect the demodulation accuracy, and the stress wavelength value of the sensor is demodulated by the principle of center wavelength positioning and the peak search algorithm. Finally, the static performance of the demodulation system is tested with an equal strength cantilever beam. The flexible plate is driven by a motor to run sinusoidal curves with frequency of 1Hz and 5Hz respectively, and the demodulation system is used to collect data. Experiments show that the linearity of the demodulation system is 0.85%, and the coefficient of determination is 0.9847 when fitting the wavelength curve.
Subjects: Library Science，Information Science >> Information Processing submitted time 2024-01-10 Cooperative journals: 《文献与数据学报》
Abstract： ［Purpose/significance］By establishing an evaluation system for intellectual property rights transformation policies, the paper provides reference basis for government departments to formulate scientific and reasonable intellectual property transformation policies, and promotes the development of national intellectual property rights.［Method/process］ On the basis of content analysis and coding of intellectual property transformation policies, a four-dimensional analysis framework is established to determine the evaluation index system of intellectual property transformation policies. Using policy quantification standards and entropy weight TOPSIS model, the six selected intellectual property transformation policies are measured and evaluated. ［Result/conclusion］ The results indicate that among the evaluation indicators of intellectual property transformation policies,the policy objective evaluation indicator has the greatest impact on the evaluation of intellectual property transformation policies, while the weight difference between policy intensity, policy tools, policy objectives, and policy action objects is relatively small among the evaluation indicators of intellectual property transformation policies. The policy tool evaluation indicator has the smallest impact on the evaluation of intellectual property transformation policies. In addition, the comprehensive ranking results of the six policies show that “the Opinions of the Ministry of Education, the China National Intellectual Property Administration, the Ministry of Science and Technology on Improving the Quality of Patents in Colleges and Universities and Promoting the Transformation and Application” is relatively ranked at the top, while “the Notice on Implementing the Special Plan for Patent Transformation to Assist the Innovative Development of Small and Medium sized Enterprises” and “the Notice of the General Office of the Ministry of Education on Carrying out the Special Supervision of the Implementation of Policies for the Transformation of Scientific and Technological Achievements” are relatively behind. Finally, based on the research results, it identifies the shortcomings of the study and proposes corresponding policy recommendations.
Subjects: Nuclear Science and Technology >> Other Disciplines of Nuclear Science submitted time 2023-11-09
Abstract： The fluorescence screen system is used to measure beam transverse profile in the accelerator. In order to further improve the measurement accuracy of the system, this paper proposes a method, filling the orientation lines of fluorescence screen with a simplified Fast Matching Method (FMM), so that the filled fluorescence screen images can reflect the beam profile information more truly. Firstly, the study uses Matlab to generate the simulated fluorescence screen images, and comparative analysis the beam profile parameters of the analog image before and after algorithm processing. The simulation results show that the Structural Similarity Index Measure (SSIM) of the processed simulated image is closer to 1, and the Mean Square Error (MSE) is smaller. Finally, the fluorescence screen images collected by the medical Heavy Ion Medical Machine (HIMM) were used for verification. After processing the fluorescence screen images collected by HIMM, the profile measurement results are close to the evaluation value. The results of this study provide a basis for the FPGA algorithm acceleration of the subsequent beam transverse profile parameter algorithm.
Subjects: Other Disciplines >> Synthetic discipline submitted time 2023-03-28 Cooperative journals: 《中国科学院院刊》
Abstract： It is known that the innovation capacity of enterprises is an important indication for an innovation economy and basic research is the source of science and technology innovation. Basic research is of course mainly carried out by universities and public research institutions, so what role should China’s enterprises play in basic research has been a long-running debate. Here in this article, we first discussed the connotation of basic research and clarified the importance of applied basic research to enterprises. We then compared the innovation
Subjects: Biology >> Botany >> Applied botany submitted time 2020-03-24 Cooperative journals: 《广西植物》
Abstract：通过对采自广西24 个县（市）的1 147 份青藓科植物标本的逐一鉴定及相关文献的查阅，确认广西青藓科植物有11 属、44 种，其中包括广西青藓科植物新纪录属1 属，即拟异叶藓属（Pseudokindbergia），新纪录种7 种，分别为拟异叶藓（P. dumosa）、匐枝青藓（Brachythecium procumbens）、阔叶尖喙藓（Oxyrrhynchium latifolium）、泛生尖喙藓（O. vagans）、华东细喙藓（Rhynchostegiella sinensis）、长肋拟青藓（Sciuro-hypnum populeum）和弯叶拟青藓（S. reflexum）。该文提供了修订后的广西青藓科植物名录，并对其中的新纪录属、种的主要形态学识别特征、生境和地理分布等进行了详细描述。
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2019-01-03 Cooperative journals: 《计算机应用研究》
Abstract： This paper developed a hybrid convolution neural network for perceptual crowd counting, which could accurately predict density maps in extremely crowded scenes. It consists of merely two components: the front-end is a dilated convolutional neural network to extract two-dimensional features; the back-end deployed a fractionally strided convolution to lower the loss of image information caused by down-sampling. This paper designed the model structure based on the dataset Shanghai Tech, then in an attempt to acknowledge and analyze the performance of the algorithm, , and afterwards made use of the evaluation indicators of the regression problem, the average absolute error (MAE) and the mean-square error (MSE) as the criteria. Additionally, testing the method on Shanghai Tech (MAE=100.8) , UCF_CC_50 (MAE=305.3) and WorldExpo'10 datasets while the experiment results reveal that the proposed model can effectively reduce MAE and MSE when compared with previous methods.
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-11-29 Cooperative journals: 《计算机应用研究》
Abstract： Feature selection technology plays an important role in big data analysis, image processing, bioinformatics and other fields. In practical applications, the objectives of reducing the classification error rate and reducing the number of extracted features for facilitating the use of subsequent data, are often two conflicting goals. The multi-object particle swarm optimization based on crowding, mutation, dominance for feature selection (CMDPSOFS) is a kind of bi-objective optimization algorithm with the minimal number of features and classification error rate in feature-oriented selection applications. The algorithm uses three different mutation mechanisms for maintaining swarm diversity and balancing global and local search capabilities. However, the uniform variation increases the randomness of the algorithm, resulting in the generation of worse solutions, which reduces the convergence speed of the algorithm. This paper proposed an improved CMDPSOFS-II algorithm to introduce the mutation and selection operations of differential evolution algorithm into the CMDPSOFS algorithm. The experimental results show that the CMDPSOFS-II algorithm is superior to the original method in feature selection and better balances global and local search capabilities.
Subjects: Biology >> Ecology submitted time 2018-05-29 Cooperative journals: 《生态学报》
Abstract：土壤重金属污染问题日益严重，具有普遍性、隐蔽性、表聚性、不可逆性等特点，已经成为环境污染治理中的热点、难点问题。解磷微生物能够依靠自身的代谢产物或通过与其他生物的协同作用，将土壤中的难溶性磷转化为可供植物吸收利用的磷，具有多重植物促生长功能和重金属解毒能力，可在重金属毒害水平下，促进植物生长、提高植物抗病能力、克服重金属对植物生长的不利影响，从而增强重金属修复植物的生存竞争力。从解磷微生物的研究现状入手，介绍了解磷微生物对土壤重金属污染的修复能力，综述了解磷微生物对土壤重金属污染修复的作用机制，分析了目前解磷微生物在重金属修复过程中存在的问题，并提出了今后研究的方向，为重金属污染土壤的修复提供了新思路。
Subjects: Biology >> Zoology submitted time 2017-10-10 Cooperative journals: 《动物营养学报》
Abstract：本试验旨在研究饲粮中添加不同水平的肌醇对獭兔皮肤中β-连环蛋白（β-catenin）和激素敏感酯酶（HSL）表达的影响。选取（40±1）日龄的同期断奶獭兔120只(公母各占1/2)，随机分成4组，每组30只。在4组獭兔的饲粮中分别添加0、25、50、75 mg/kg的肌醇，试验期为3个月。在试验的第30天（2月龄）、第60天（3月龄）和第90天（4月龄），分别取腹部、背中部、臀部皮肤，采用免疫组织化学和蛋白质印迹（Western blot）法对β-catenin和HSL的表达和定位进行检测。结果表明：β-catenin在毛囊中广泛表达，在毛根鞘细胞和毛乳头均有棕黄色阳性反应细胞。HSL在毛根鞘细胞，尤其是在内根鞘细胞内，呈现非常明显的棕黑色强阳性表达。饲粮中添加50 mg/kg肌醇可以极显著增加2~4月龄獭兔背中部皮肤毛囊中β-catenin和HSL阳性表达细胞的平均灰度值（P＜0.01），极显著增加4月龄獭兔背中部、腹部和臀部皮肤毛囊中β-catenin和HSL阳性表达细胞的平均灰度值（P＜0.01）。结果提示，肌醇能够通过上调4月龄獭兔毛囊中β-catenin和HSL的表达来促进毛囊的发育，在本试验中，饲粮肌醇水平达到50 mg/kg时效果最佳。
Subjects: Biology >> Bioengineering submitted time 2017-07-24 Cooperative journals: 《中国生物工程杂志》
Abstract： Rare diseases, also known as "orphan diseases", refer to the diseases which have a very low morbidity. Most of orphan diseases are congenital disease or chronic disease, and they are often dangerous. With the improvement of public awareness, support of national policy and development of diagnosis and treatment technology, orphan drugs market has gradually developed. Sales of the orphan drugs increased year by year and several "heavy bombs" have arisen. The international pharmaceutical companies began to seize the orphan drugs market and intensified drug development. The number of orphan drugs under research and development is more than 500, which are mainly for rare cancer, hereditary diseases, neurological diseases, infectious diseases and autoimmune diseases. Developed countries and regions have mature management system and market of orphan drugs, but China is still relatively backward in this regard. This paper analyzes the dilemmas of domestic orphan drugs market and puts forward some suggestions for these dilemmas, hoping to promote the development of the domestic orphan drugs market.
Subjects: Materials Science >> Materials Science (General) submitted time 2016-11-12 Cooperative journals: 《中国腐蚀与防护学报》
Abstract：本文通过溶胶-凝胶旋涂法在不锈钢基底上制备了具有超疏水性能的介孔碳复合SiO2涂层。通过透射电子显微镜（TEM）、扫描电子显微镜（SEM）及静态接触角、电化学测试技术（Tafel、EIS）等对其结构、疏水性能和耐蚀性等进行表征。结果表明：在不锈钢基底上形成了乳突状形貌，水在涂层表面静态接触角达到163°，电化学测试结果显示该超疏水性SiO2/介孔碳复合涂层具有优良的防腐性能。
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