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综合能源系统是今后分布式发电站的重要发展方向之一。为了分析计及电价响应和电网激励对电转气（power to gas,P2G）技术的影响，建立了一个结合沼气厂的可逆固体氧化物电池（reversible solid oxide cell,RSOC）热-电-气综合能源系统模型。利用GAMS仿真软件分析了案例中引入的不同能量消耗方式对系统的影响，比较了热电联产（combined heat and power,CHP）和RSOC两种消耗沼气生产电力和热能方式的优劣，分析了电价波动对综合能源系统的投资成本和“弃风、弃光”的决策影响。引入RSOC之后带来的高电能转化率与CHP产生的高热量转化率相配合，能减少系统的投资成本，使可再生能源得到更合理地配置；引入沼气储罐可以平衡每天的供需要求，使系统的自耗电能力得到大幅提升，系统从电网购电降低了20%。随着电价持续增长，沼气储罐和RSOC的最优投资容量逐渐增加。当电价增长一倍时，最优系统案例中从电网购电量同比降低89.944%，同时系统的投资成本增速比传统系统慢。

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BACKGROUND: With the innovation of examination technique, the number of patients with spinal metastases in different stages is increasing year by year. Percutaneous vertebroplasty is an important treatment for spinal metastases; however, there is no report on the biomechanical effect in different stages and different activities after operation. OBJECTIVE: To simulate thoracic T10 bone stress and displacement of the different locations of the tumor metastasis based on the three-dimensional finite element model. METHODS: According to thoracic three-dimensional CT images of a 30-year-old healthy male, Mimics software was used to construct a three-dimensional geometric model of thoracic vertebrae (T9-T11), including ribs, ligaments and intervertebral discs. Three-dimensional models of T9-T11 vertebral bodies and different parts of the posterior thoracic vertebrae invaded by thoracic metastatic tumors were simulated, including the control group with intact vertebral structure, unilateral metastasis involving the vertebral body area (experimental group 1), unilateral metastasis involving the vertebral body and pedicle area (experimental group 2), unilateral metastasis involving the vertebral body, pedicle and transverse process area (experimental group 3), and bilateral metastasis involving the vertebral body, pedicle and transverse process area (experimental group 4). Abaqus software was used to create a three-dimensional finite element model. The von Mises stress distribution and the displacement of the model were analyzed under the loading condition, buckling condition, extension condition, and rotation condition. RESULTS AND CONCLUSION: (1) In the study of the maximum total displacement of loading points in different experimental groups under loading, flexion, extension, and rotation conditions, with the increase of metastatic tumor invasion site and invasion surface, the total displacement of loading points increased, and the overall stiffness decreased, especially the total displacement of loading points in experimental group 4 was the largest. (2) Under flexion condition, the maximum Von Mises stress value increased significantly after vertebral body and pedicle destruction, while the maximum Von Mises stress value was almost unchanged when the thoracocostal joint destruction was added. (3) On the basis of finite element analysis and simulation of bone tumor model, the elements in the bone cement region were set as a single set, and the bone cement region was set as the corresponding material properties to simulate bone cement filling. The results showed that the maximum total displacement under loading, flexion, extension, and rotation conditions was less than that of each experimental group. (4) The maximum stress values of the simulated percutaneous vertebroplasty patients in the loading, flexion, extension and rotation conditions were significantly lower than those of the femoral model. (5) It is concluded that the three-dimensional finite element model based on thoracic T9-T11 conducive to the biomechanics characteristics of thoracic vertebrae tumor metastasis, and on the basis of the thoracic vertebrae tumor metastasis model can accurately simulate load point after percutaneous vertebral body under different conditions of total displacement and the maximum Von Mises stress situation. [ABSTRACT FROM AUTHOR]

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Copyright of Gold (1001-1277) is the property of Gold Magazine Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Hydrogeology & Engineering Geology / Shuiwendizhi Gongchengdizhi is the property of Hydrogeology & Engineering Geology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of High Pressure Physics is the property of Chinese Journal of High Pressure Physics Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Environmental Science & Technology (10036504) is the property of Editorial Board of Environmental Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Matrix inversion is a basic problem in engineering calculation. In large-scale MIMO systems, array signal processing, image signal processing and other applications, the processing speed of large-scale matrix inversion is very important to the system performance. However, the traditional matrix inversion method has high computational complexity, low parallelism and consumes a lot of storage space, which is not conducive to hardware acceleration. Aiming at the hardware acceleration problem of large-scale matrix inversion, this study studies the matrix inversion algorithm based on LDL decomposition and proposes a large-scale matrix inversion acceleration architecture based on this algorithm. Using the characteristic that the diagonal elements of triangular matrix after LDL decomposition are all 1, the matrix is designed by block iteration, which reduces the amount of calculation and improves the calculation speed. This study designs and implements the accelerator based on Xilinx Virtex7 FPGA. The experimental results show that under the 128 order matrix, the throughput is 105.2 Inv·s-1 and the maximum clock frequency is 200 MHz. Compared with the existing matrix inversion acceleration scheme, this design occupies less hardware resources and has higher performance. [ABSTRACT FROM AUTHOR]

Copyright of Acta Prataculturae Sinica is the property of Acta Prataculturae Sinica Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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A large amount of dairy manure has posed a great threat to the environmental pollution (air, water, and soil) in the large-scale intensive dairy farming in China. Taking the dairy manure as a bedding material, some new types of manure treatment have been implemented to improve the internal resources recycling in the dairy husbandry industry at present. The safe moisture content of dairy manure is required normally 40%-50% or less for the dairy bedding material. But the high moisture content (about 75%) has been confined to the extending of dairy manure after the solid-liquid separation. Furthermore, the dairy manure is characterized by a kind of high-humidity porous material with a high free water content and dry heat conductivity. Therefore, a drying process of dairy manure can be a necessary step to fully meet the safety standards of dairy bedding materials. This study aims to optimize the process parameters and hot-air drying characteristics of the dairy manure solids under different drying conditions. Some factors were selected, including the drying temperature (60, 75, 90 and 105 ℃), the thickness of the manure layer (15, 30, 45 and 60 mm), and the duration of mixing frequency (2, 4, 6 and 8 min). The moisture content and drying rate were also measured for the dry matter in the dairy manure. The drying and weighing procedures were carried out as follows. In drying, after deforesting with at the room temperature for 12 hours, the dairy manure was put into a square stainless-steel tray with a specified thickness, where the hot-air drying test was carried out under different conditions. In weighing, the dairy manure was taken out of the drying oven every 30 minutes, and then weighed with an electronic balance, where the mass of the dairy manure was recorded. The drying test was stopped until the moisture content of the dry matter basis in the dairy manure was under 1 g/g (the moisture content of the wet matter basis was 50%). After that, six representative thin-layer drying models were applied to simulate the effective diffusion coefficient and activation energy of the drying process. An orthogonal test was also designed for the process parameters of rapid drying with the highest drying efficiency. The results showed that the higher the drying temperature was, the smaller the dairy manure thickness was, and the shorter the mixing frequency interval was, the faster the dry matter basis moisture content decreased. Moreover, the drying process of dairy manure was divided into three periods: an accelerated drying, an approximate constant-rate drying, and a falling rate period, indicating a better consistence with the drying characteristics of high-humidity porous materials. The Wang and Singh model was more suitable for the drying process of dairy manure, where the minimum effective diffusion coefficient was 7.31×10-5 m²/h, the minimum activation energy was 14.596 kJ/mol, and the orthogonal test results showed that 0.017 h/g, when the drying temperature was 105 ℃, the manure thickness was 6 cm, and the mixing frequency interval was 4 min. The finding can provide a theoretical data support to optimize the rapid drying process of dairy manure. [ABSTRACT FROM AUTHOR]

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BACKGROUND: Hydrogel can simulate the natural tissue environment, provide structural support for defects and repair bone defects. OBJECTIVE: To summarize and analyze the application progress of hydrogel in bone defect. METHODS: PubMed, CNKI, VIP, and Wanfang databases were searched by computer with the English and Chinese key words of “hydrogel, bone defect” to search the application of hydrogel in bone defect. RESULTS AND CONCLUSION: Hydrogel shows the homogeneity of water. It can simulate human tissue environment, encapsulate its contents with minimal invasion, manipulate and transfer it to surrounding tissues, provide structural support for defect sites, and repair bone defects through internal healing mechanism, which has unique advantages. Among the ion-mediated hydrogels, alginate is the most studied. Because of its polysaccharide structure, the zinc alginate crosslinked hydrogel system is larger, and the chemically crosslinked hydrogel, polymers with high affinity to each other and showing significant solubility in injectable media can be modified to form a covalently connected network at the delivery point. This type of hydrogel is characterized by the addition of protein-derived bioactive substances to form a stable network of chemically cross-linked polymers. Naturally extracted hydrogels such as gelatin, hyaluronic acid and silk fibroin, as well as synthetic polyethylene glycol are easy to obtain and relatively easy to produce. In this series of studies, naturally derived hydrogels show good biocompatibility and natural polymers as thermosensitive hydrogel carriers lack versatility and responsibility. Therefore, the synthesized derived polymers have been used as the basis for modification and binding with natural polymers. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Aiming at the quality control problem in crowdsourcing data processing, this paper proposed a weighted K-nearest neighbor voting method. This method not only considered the mark of a certain sample to return an answer, but rather obtained a more accurate answer by considering the neighbors of the sample comprehensively. At the same time,it applied appropriate weights to the neighbors of the sample to further improve the performance of the algorithm and maintained the simplicity of the traditional majority vote. The K-nearest neighbor vote can effectively solve the problem of lack of markup. By weighting the neighbors, it can solve the influence of the unbalanced mark and made the generalization of the algorithm be stronger. Through experiments in various situations, the results show that the proposed weighted K-nearest neighbor voting method has achieved good results. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Henan Agricultural Sciences is the property of Editorial Board of Journal of Henan Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Most of the existing NFC mobile payment schemes have some problems such as complex certificate management,low consumer privacy protection and low operating efficiency, using the certificateless signcryption technology without bilinear pairing operations and the anonymous technology to propose an efficient and secure NFC mobile payment scheme. The scheme used the dynamically updated anonymous trading account to realize the anonymous transaction of the consumer and the unlink-ability of the transaction. The merchant acted as a bridge between the consumer and the mobile payment service provider, enabling the consumer to pay offline. The result shows that the scheme provides high-security transactions and high-quality personal privacy protection as well as high-efficiency mobile payments. [ABSTRACT FROM AUTHOR]

Copyright of Application Research of Computers / Jisuanji Yingyong Yanjiu is the property of Application Research of Computers Edition and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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