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The multi terminal flexible interconnection equipment with cascaded full bridge and dual active bridge structure could connect AC power grid and multiple DC power grid, and instantaneous power differences in different DC power grids and sub module faults could lead to unbalance grid current and DC capacitor voltage distribution. For the three-phase star interconnection structure, this paper adopted the control strategy of injecting zero sequence voltage to meet the different power requirements, derived the specific zero sequence voltage component expression, and quantitatively analyzed the limitation range of injected zero sequence voltage. Finally, a simulation experimental platform was built to verify the effectiveness of the method. The simulation results indicated that injecting zero sequence voltage on the basis of the normal control architecture can allocate the power between phases to ensure grid current balance, reduce imbalance from 6% to 1%,and maintain the even distribution of DC capacitor voltage. [ABSTRACT FROM AUTHOR]

The stable nitrogen and oxygen isotopic ratios (δ15N, δ18O) have been used extensively as important tools to identify nitrate sources and understand nitrogen biogeochemical cycle. The ion exchange technique, one of the most widely used analytical methods for nitrogen isotope composition of nitrate, measures oxygen isotope composition of nitrate from a solution can have a complex sample preparation procedure and time-consuming (3~5 days) that have restricted their application in the laboratory. Here we propose an improved method of ion exchange to measure δ18O of NO3-, which utilizes BaCl₂ to remove non-nitrate oxygen-bearing anions (SO42- and PO43-) in the first step. followed by a collected of water nitrate with an anion exchange column, eluted with HCl, then neutralized with Ag₂O to obtain solid AgNO3 and analyzed for its δ18O. Comparing with an original ion exchange technique, the benefits of improved method are: (1) the procedure employed to separate nitrate reduced from 5 steps to 3 steps; (2) the time taken to sample preparation dropped from 3~5 days to 1-2 days; (3) reduction of the need for expensive chemical reagents; (4) reduction of oxygen isotopic fractionation. [ABSTRACT FROM AUTHOR]

To find out the inherent causes related to the borehole wall collapse in drilling the Shiqianfeng formation - Shihezi formation in the east of the Yan’an gas field, samples were taken from the rig-sites and were studied for their mineral composition, physical-chemical features and mechanical characteristics. Based on the study a measure dealing with the borehole wall collapse, which is to inhibit the self-imbibition of liquid into the formation rocks, is presented. From the study it was found that the Shiqianfeng formation - Shihezi formation in the east of the Yan’an gas field contain 15.44% - 47.52% clays, and are a formation with weak expandability and moderate dispersibility. The rock samples are developed with micro-fractures and micro-fissures which are the main causes for the invasion of liquids and hence the collapse of borehole walls. The percent cuttings recovery of the samples tested on hot roller tester in distilled water is less than 67.2%, and the linear percent expansion of the cores made of the samples in distilled water is less than 8.14%. The Shihezi formation shows stronger dispersibility and stronger hydrophilicity than those of the Shiqianfeng formation. After soaking in a drilling fluid, the triaxial compressive strength of the Shiqianfeng sample is reduced from 186.04 MPa to 98.13 MPa, and the triaxial compressive strength of the Shihezi sample is reduced from 90.09 MPa to 49.21 MPa, indicating that the invasion of the drilling fluid into the rocks along the micro-fractures and micro-fissures causes the strengths of the formations to reduce. Using 0.3% self-imbibition inhibitor ZXS-1, the degrees of saturation of water phase and oil phase in the rock samples can be reduced from 72.6% and 86.6% to 4.7% and 33.5%, respectively, and the ZXS-1 additive can form a dense layer of adsorption around the surfaces of the rocks, thereby turning the wettability of the rock surfaces from hydrophilicity to hydrophobicity. By inhibiting the water imbibition into the rocks, the micro-fractures and micro-fissures are plugged and the liquid can no longer invade into the rocks, and the borehole walls are thus stabilized. [ABSTRACT FROM AUTHOR]

In 2022, compared with the previous year, the total funds of Chinese academic libraries in- creased slightly. The average literature resources purchase fee was 1 million and 981 thousand Yuan and de creased slightly from last year. The average electronic resources purchase fee was 3 million and 617 thousand Yuan increased slightly compared with the previous year. The average library space was 260 thou- sand square meters, increased slightly from the previous year. The professional titles of library directors were mainly senior and associate senior professional. The average number of positioned staff were 28.6 which kept slightly downward trend. The academic degree of positioned staff had improved significantly, and the number of staff with doctors degree and masters degree kept increasing in 2022. However, the young positioned staff whose age was below 29 years old were very scarce with 3.7% and their average were 1.07 person per academic library. The average of contract staff and temporary staff decreased while part- time job students increased. The utilization rate of library resources decreased compared with the previous year. The average volume of books and periodicals borrowed in academic library were 42 thousand volumes. The average cumulative volume of paper books were 1 million and 369 thousand including 11 thousand volume of ancient books. We can estimate that the total volume of ancient books in Chinese academic libraries might be over 13 million and 590 thousand volumes. [ABSTRACT FROM AUTHOR]

The lack of domestic sewage governance in Chinese rural areas and the shortage of water for agriculture have led the academic community to call for breaking away from the traditional thinking of pure sewage treatment and developing a new model that combines the moderate treatment of rural domestic sewage with resource use. China ′s rural domestic sewage governance has recently received attention, and remarkable progress has been achieved, but prominent problems, such as the lag in governance, the imperfections in the governance system, the lack of standards and specifications, and the lack of systematic planning, need to be addressed. This paper summarizes the research progress on the resource use of rural domestic sewage, analyzes its progress and practical difficulties, and proposes a path to the realization of rural domestic sewage governance in terms of system concept, evaluation methods, formulation and revision of standards, innovative measures, and pilot demonstrations. This study provides technical support for domestic sewage governance in rural areas of China. [ABSTRACT FROM AUTHOR]

Optimizing the allocation of equipment resources is conducive to improving the utilization rate of equipment, reducing the construction cost of intelligent prefabricated plant, and improving the enterprise benefits. Based on the intelligent optimization algorithm, the intelligent prefabrication workshop of large concrete components was taken as the research object. According to the characteristics of the production process of prefabricated components, considering the working time of workers and the continuity of each process, the optimization model of equipment resource allocation was constructed, and the model was solved by combining the differential evolution algorithm of adaptive mutation operator on the basis of double mutation strategy. Thus, the best plan for equipment resource allocation of intelligent prefabricated concrete components workshop was obtained. [ABSTRACT FROM AUTHOR]

Objective To investigate the clinical efficacy of ZHUANGYAOHUOLUO capsules combined with calcitriol soft capsules and calcium carbonate D3 tablets (Ⅱ) in the treatment of senile osteoporosis (SOP) of kidney deficiencies and blood stasis type.Methods From January 2019 to December 2021, a total of 60 eligible elderly patients with senile SOP of kidney deficiency and blood stasis type who met the criteria were selected and divided into the control group and the treatment group according to the random number table method, with 30 cases in each group.The control group was treated with oral calcitriol soft capsules and calcium carbonate D3 tablets (Ⅱ), while the treatment group was treated with ZHUANGYAOHUOLUO capsules in addition to the treatment given to the control group.Both groups of patients were treated continuously for three months and followed up for six months.The changes in Visual Analog Scale (VAS) scores, bone mineral density (BMD), bone metabolism markers [N-terminal peptide of type Ⅰ procollagen (PINP), carboxy-terminal telopeptide of type I collagen (β-CTX)], and traditional Chinese medicine syndrome scores were observed and compared before and after treatment, as well as during a 6-month follow-up period for the two groups of patients.Results After treatment and six months of follow-up, the VAS score, TCM syndrome score, and β-CTX level of both groups of patients all improved compared with before treatment, and the improvement in the treatment group was more significant than that in the control group,with statistically significant differences (P <0.01).Compared with before treatment,the PINP level in the control group decreased significantly (P <0.01),while the PINP level in the treatment group did not decrease significantly (P > 0.05). The BMD levels of both groups of patients increased after a 6-month follow-up compared with before treatment,and the BMD level in the treatment group was higher than that in the control group with statistically significant differences (P <0.01). The total effective rate of treatment in the treatment group was 93.33%,significantly higher than that in the control group of 80.00%,with statistically significant difference (P <0.05). Conclusion ZHUANGYAOHUOLUO capsules combined with calcium carbonate D3 (Ⅱ) and calcitriol soft capsules can effectively treat senile SOP with kidney deficiencies and blood stasis type,which can relieve pain,improve TCM syndrome score and bone turnover marker level,improve BMD and is safe. It is worthy of clinical promotion. [ABSTRACT FROM AUTHOR]

The Chang 6 oil member in the Wangzhuang area, eastern Ordos Basin is a tight sandstone reservoir with poor reservoir physical properties and strong heterogeneity. It is significant to clarify the relationship between the reservoir􀆳s four properties and the lower limit of effective reservoir parameters for dessert prediction. The core, logging, and physical property analysis data were used to clarify the “four properties” relationship of Chang 6 reservoir in the Wangzhuang area. The physical properties of fine sandstone are relatively good, and there is a good correspondence between acoustic time difference and reservoir physical properties. In addition, the deep induction resistivity has a good indication of reservoir oiliness. The average deep induction resistivity of the oil-water layer is 20 ~ 40 Ω·m, while that of the water layer is 12 ~16 Ω·m. On this basis, combined with core, logging, production test, and geochemical analysis data, and using a variety of methods, the lower limit of effective reservoir parameters of Chang 6 reservoir in the Wangzhuang area was determined. The results are as follows: the porosity is 8. 0%, the permeability is 0. 2 mD, the lower limit of lithology is fine sandstone, the lower limit of oil grade is oil trace, the oil saturation is 38. 0%, the deep induction resistivity is 20. 0 Ω·m, and the acoustic time difference is 215 μs/ m. [ABSTRACT FROM AUTHOR]

The sulfuric acid was used to deep decalcification of frozen mother liquor after phosphate rock decomposition by the nitric acid method. The influences of reaction temperature, time, sulfuric acid add-ed,and Ca0 content of mother liquor on the decalcification rate were investigated. The factors affecting the decalcification rate were screened for response surface experimental design. The mathematical model relat-ed to each process parameter and the decalcification rate was obtained to predict the phosphorus release rate under optimal process conditions. The results show that when the reaction temperature is 80 °C, the amount of sulfuric acid is 110% of the theoretical amount. The decalcification rate is the highest,with the concentration of calcium oxide in the reactant at 5.84%. The predicted value is 97.30%,and the experi-mental value is 97.33%. [ABSTRACT FROM AUTHOR]

Objectives: Based on the first asteroid exploration plan announced by China Space Administration on April 19, 2019, the main belt comet 133P/Elst-Pizarro (7968) is one of the possible mission tar‐ gets. We aim to report integrated orbital fits for 133P through all the available ground-based optical data. Methods: We developed an optical orbit determination software and compared it with the well-known Orb‐ Fit software system. The 133P/Elst-Pizarro' s ground-based optical observation data from July 24, 1979 to October 28, 2019 were analyzed. In addition, we carried out a simulation orbit determination analysis aimed at 133P/Elst-Pizarro to discuss the orbit determination accuracy from ground-based optical data. Results: After the fitting process, the residual distribution of 133P ground-based optical data is consistent be‐ tween our results and the results from OrbFit. The measurement statistical residual root mean square (RMS) is less than 0.01″, and the internal coincidence accuracy of orbit determination is also consistent with each other. In our simulation experiments, we used 20-year simulation optical observation data measured once a month from Yunnan station and Chile station. The data were also added with Gaussian white noise which is close to the current actual observation level. The results of our simulation experiments reflected that the optical orbit determination accuracy of the asteroid was at 50 km level. Conclusions: The processing results of 133P optical data suggests the reliability of our software. Further simulation analysis shows that the optical orbit determination accuracy of the asteroid can be effectively improved by increasing the observation data or reducing the observation noise. [ABSTRACT FROM AUTHOR]

Objective：To investigate the application of arthroscope in the surgical treatment of the patients with temporomandibular joint synovial osteoma disease, and to clarify its value in improving the clinical diagnosis and treatment efficiency and prognosis of the patients with the disease. Methods：The clinical data of two patients with temporomandibular synovial osteoma disease treated with arthroscope were collected. The opening degree, maximum anterior extension and lateral movements, and pain improvement of the patients were compared before and 6 months after surgery, and the operation procedure was summarized，and the significance of arthroscope application was analyzed combined with literature review. Results：Two patients with temporomandibular synovial osteoma disease both chose the method of open surgery combined with arthroscope. With the assistance of arthroscope, the open surgery completely removed the chondroma bodies, and the removal of inflammatory synovial tissue was carried out. The opening degrees of the patients reached 33 and 35 mm, respectively, 6 months after operation, and the maximum anterior extension and lateral movement were ≥7 mm，the joint function was gradually restored. Conclusion：Arthroscope has obvious advantages in the surgical treatment of the patients with temporomandibular synovial osteoma disease, but fully arthroscopic surgery is limited by the complex structure of the joint, and if the tumor is too large or not confined to the supra-articular cavity, open surgery combined with arthroscope is required when necessary. [ABSTRACT FROM AUTHOR]

Objective: To investigate the relationship between serum homocysteine (Hcy), PANDER, Obestatin and blood glucose control situation and pregnancy outcome in patients with gestational diabetes mellitus (GDM). Methods: 286 patients with GDM who were treated in our hospital from January 2021 to January 2022 were selected. According to the level of glycosylated hemoglobin (HbA1c) before delivery, they were divided into blood glucose control standard group (HbA1c < 7%, 173 cases) and blood glucose control non standard group (HbA1c ≥ 7%, 113 cases). The levels of serum Hcy, PANDER, Obestatin, fasting plasma glucose (FPG), fasting insulin (FINS) and insulin resistance (HOMA-IR) at the time of enrollment in the two groups of patients were detected and compared. Pearson correlation analysis was used to analyze the correlation between Hcy, PANDER, Obestatin and FPG, FINS and HOMA-IR. According to the pregnancy outcome, they were divided into poor pregnancy outcome group (90 cases) and good pregnancy outcome group (196 cases). Multivariate Logistic regression was used to analyze the influencing factors of pregnancy outcome in patients with GDM. Results: The levels of serum Hcy, PANDER, FPG, FINS and HOMA-IR in the blood glucose non control standard group were higher than those in the blood glucose control standard group, while the level of Obestatin was lower than those in the blood glucose control standard group (P＜0.05). The levels of serum Hcy and PANDER were positively correlated with the levels of FPG, FINS and HOMA-IR, and the level of Obestatin were negatively correlated with the levels of FPG, FINS and HOMA-IR (P＜0.05). The age, body mass index (BMI) at enrollment, family history of diabetes, proportion of blood glucose control not up to standard and the levels of serum Hcy, PANDER, FPG, FINS and HOMA-IR in the poor pregnancy outcome group were higher than those in the good pregnancy outcome group, while the level of Obestatin was lower than that in the good pregnancy outcome group (P＜0.05). Blood glucose control not up to standard, the levels of serum Hcy and PANDER were the risk factors of poor pregnancy outcome in patients with GDM, while the level of Obestatin was the protective factor (P＜0.05). Conclusion: The levels of serum Hcy and PANDER increased and the level of Obestatin decreased in patients with blood glucose control not up to standard in GDM, which are related to insulin resistance and poor pregnancy outcome. [ABSTRACT FROM AUTHOR]

In 2021, compared with the previous year, the total funds of Chinese academic libraries and average literature resources purchase fee decreased slightly and the average paper literature resources purchase fee increased slightly. The average electronic resources purchase fee was 3.37 million yuan, slightly lower than the previous year. Yet, the proportion of literature resources purchase fee increased by 7.9% compared with the previous year, which showed academic libraries might actively respond to the new needs of readers under the environment of COVID-19 epidemic prevention and control. The average library space was 25.500 thousand square meters, unchanged from the previous year. The professional titles of library directors were mainly senior and associate senior professional. The average number of positioned staff were 28.9, which kept downward trend. However, the academic degree of positioned staff had improved significantly, and the number of staff with doctor’s degree and master’s degree kept increasing in 2021. The average of part-time job student kept stable. Affected by the COVID-19 epidemic, the utilization rate of library resources increased significantly compared with the previous year. The average volume of books and periodicals borrowed in academic library were 54 thousand. The average cumulative volume of paper books were 1.315 million including 12 thousand volume of ancient books. We can estimate that the total volume of ancient books in Chinese academic libraries might be over 15.038 million volumes. [ABSTRACT FROM AUTHOR]

Intelligent enabling, multi-dimensional attack and defense, and elastic distributed cooperation have become the important directions of the development of the future attack and defense combat system. Facing the future confrontation of the whole domain three-dimensional attack and defense system, this paper comprehensively analyzes the requirements of future intelligent cross domain elastic defense operations, and puts forward the construction ideas and development stages of the future intelligent cross domain elastic defense system. Furthermore, the key technologies of intelligent cross domain elastic defense system are analyzed to support its construction in the future. [ABSTRACT FROM AUTHOR]

Objective To study the effect of spring coil tumor embolization in the treatment of emergency subarachnoid hemorrhage ( SAH) and its influenc on the index level of humoral immune. Methods A total of 112patients with SAH in high-grade aneurysms treated in the Third People’s Hospital of Yibin from October 2017 to August 2020 were selected, and divided into observers group ( n = 40) and control groups ( n = 82) according to randomized digital tables. The observation group gave the spring coil aneurysm and the control group. Both groups were followed up for 3 months to compare the efficacy of the two groups. GOS scores, neurological function, and sleep quality were compared between the two groups. Immunological measures[immunoglobulin ( Ig) A, Ig M, and Ig G]levels were compared between the two patient groups. The duration of hospitalization, recurrence rate, complete occlusion rate, and complication incidence ( intracranial infection, cerebral vasospasm, rehemorrhage, and hydrocephalus) were compared between the two groups. Results The good prognosis rate of patients in the observed group ( 76. 83%) was significantly higher than in the control group ( 42. 50%) . There were no differences in GOS scores, neurological scores, and sleep quality scores between the two groups before treatment ( P ＞ 0. 05) . Posttreatment, GOS, neural function and sleep quality scores were lower than control. Prior to surgery, the levels of Ig A, Ig M and Ig G were not different between the two groups ( P ＞ 0. 05) . After operation, the immune indexes of the two groups decreased first and then increased, and the difference was statistically significant, one day and 5 days after surgery, both the observed groups had higher Ig A, Ig M and Ig G levels than in the control group. The length of hospital stay in the observation group was significantly shorter than that in the control group. There was no statistical difference in the recurrence rate and the complete occlusion rate between the two groups ( P ＞ 0. 05) . The cerebral vasospasm rate in the observed group was lower than that in the control group ( P = 0. 025) . There were no differences in the rate of intracranial infection and rehemorrhage in the two groups ( P ＞ 0. 05) . Conclusions Intracranial embolization in the treatment of emergency SAH, can improve the neural function and immune function of patients, and has a low incidence of complications. [ABSTRACT FROM AUTHOR]

Light-aggregate porous concrete can be applied to traffic noise control because of its light weight, porosity and good weather resistance. This experiment developed a new light-aggregate porous concrete using fly-ash cenospheres, namely solid wastes from thermal power plants, as aggregate and cement as cementitious material. It could be applied to the sound absorption material of the road noise barrier. Impacts of two factors, namely molding pressure and aggregate-to-cement ratio, on the acoustic performance were investigated through experimental characterization. Horoshenkov & Swift model was also used to inverse calculate the tortuosity and flow resistance of the material to investigate the effect of molding conditions on them. The results show that with the increase of pressure, the first peak frequency of sound absorption of the specimen shifts to low frequency and the absorption coefficient at the peak decreases. With the rise of aggregate-to-cement ratio, the peak frequency of sound absorption shifts to high frequency, and the absorption coefficient at the peak increases. The calculation results of the inverse computation show that the fitting degree R2>0.8, which is credible. Under the condition of 0.9 aggregate-to-cement ratio, the forming pressure is positively correlated with the tortuosity and flow resistance. While under the forming pressure of 0.2 MPa, the aggregate-to-cement ratio is negatively correlated with the curvature factor. [ABSTRACT FROM AUTHOR]

Based on written consultation with 15 reputable experts, this paper summarizes the current situation, highlights and problems of ancient books protection and utilization in university libraries and puts forward some suggestions to promote further progress in this field. [ABSTRACT FROM AUTHOR]

The aroma of rose water is positively correlated with its quality and economic benefits, and it is the main basis for determining the quality of rose water. The volatile components in rose water were analyzed by headspace solid phase microextraction-gas chromatography-mass spectrometry (HS-SPME-GC-MS) combined with automatic mass spectrometry deconvolution and identification system (AMDIS). Taking Kushui rose flower water as the research object, the effects of different solid phase extraction heads, sample volume, magnetic stirring method, sodium chloride content, extraction temperature, equilibrium time, and extraction time on the extraction effect of rose flower dew aroma components were optimized. Peak area and peak number were two indicators to investigate the extraction effect of each factor. The chromatographic peaks were purified by AMDIS under the optimal experimental parameters: solid phase extraction head of 75 μm Carboxen/PDMS, sample size of 10 mL, magnetic stirring, sodium chloride content of 1.0 g, equilibrium time of 20 min, extraction temperature of 40 ℃, extraction time of 40 min. 60 kinds of aroma components in rose flower water and rose cell liquid were identified with the Spectral Library Search and retention index. 59 kinds of rose flower water were identified, and the relatively high content of aroma components were citronellol (19.00%), methyl eugenol (13.97%), eugenol (13.81%), α-terpineol (11.80%), linalool (5.27%). 22 kinds of rose cell sap were identified, and the relatively high content of aroma components were citronellol (44.22%), benzyl alcohol(6.07%), methyl eugenol (5.08%), α-terpineol (5.08%), (E)-linalool oxide (3.39%), linalool (3.10%). There were 21 kinds of components in rose water and rose cell fluid, the sum of relative content was 76.60% and 78.42%, respectively. The results showed that the identification results obtained by automatic deconvolution technology, library search and retention index were mutually verified, which could significantly improve the accuracy and reliability of the identification of unknown components, and make up for the co-elution of impurities, noise and compounds in low-resolution mass spectrometry. In the qualitative process of the target, there were multiple compounds with high matching degree in the same mass spectrum, or the phenomenon of similar matching and extremely low matching occured when the target was qualitatively identified, which made accurate qualitative determination of the target difficult, and even leaded to qualitative errors. This qualitative method can be widely used in the qualitative analysis of volatile components in complex samples. [ABSTRACT FROM AUTHOR]

Cerium manganese oxide (MnOx-CeO2) catalyst was prepared by modified co・precipitation method, and the catalytic effect of MnOx-CeO2 on formaldehyde under the conditions of low temperature and low concentration close to the real car environment in summer was investigated by using the environmental chamber method・ The effect of solar radiation intensity, initial concentration of formaldehyde on the performance of MnOx-CeO2 thermal catalytic formaldehyde was investigated・ The results showed that the catalyst had rich pore structure and excellent photothermal conversion ability・ Compared w让h the oxide alone，the oxidation ability of the catalyst was significantly improved・ The formaldehyde degradation rate could reach 76. 2% to 82. 1% for the initial concentration of 0・ 5 mg/m³ at the solar radiation intensity of 450 ~ 650 W/m²，and the E-R model was closer to this experimental data・ At the solar radiation intensity of 550 W/m2 and irdtial concentrations of 0. 2,0. 5 and 1・ 0 mg/m3 ，the degradation rate were 63%，70・ 6% and 78. 3%, respectively, with obvious degradation effects・ In addition? the formaldehyde catalytic effect of five different catalysts (MnOx-CeO2，MnOx-CeO2-TiO2 ,TiO2，Bi-V-O? CuO-MnO2) under the same experimental conditions was compared, and it was found that the degradation rate of MnOx-CeO2was the highest? which was 78. 3%,the catalyst has good stability・ The results indicate that the catalyst has a wide application prospect in the catalytic oxidation of formaldehyde at low temperature such as in vehicles. [ABSTRACT FROM AUTHOR]

It has become increasingly common for tourists to share their personal travel experiences on social media. This user-generated content with spatial references provides a rich database for tracing the evolution of the cognitive image of a tourism destination over a long period of time. This is helpful for local authorities to improve destination management and marketing by prompting image adjustment and tourism product optimization to satisfy tourists' expectations. In this study, data on online travels on Ctrip.com, one of the most popular tourism websites in China, were collected and analyzed to reveal the spatiotemporal evolution of the cognitive image of Chengdu from 2000 to 2019. Based on a specific tourism-related lexicon, keywords were identified and grouped in a list, following a framework comprising six dimensions: tourism attraction, tourism leisure and entertainment, public infrastructure, tourism infrastructure, tourism environment, and local atmosphere. The six dimensions were further divided into 18 sub-dimensions. Under this framework, the general trends and spatiotemporal evolution characteristics of Chengdu's cognitive image during this period were analyzed. Specifically, changes in the shares of identified keywords related to the six dimensions during the period explained the general trend characteristics, while changes in the standard deviational ellipse (SDE) of the distribution of identified keywords with spatial reference, together with changes in the shares of identified keywords related to the 18 sub-dimensions in detail, were adopted to vividly show the spatiotemporal evolution of Chengdu's cognitive image. Our findings revealed that Chengdu's cognitive image has experienced obvious spatiotemporal evolution across different sub-dimensions over the past 20 years. Generally, the cognitive image has became substantial during this period, with a continuous increase in the total share of identified keywords related to the cognitive image of online travels. In addition, the shares of keywords related to the six dimensions and 18 sub-dimensions varied across different stages. Particularly, the spatiotemporal evolution shows that (1) there is an evident shift from sightseeing tourism to experience tourism, as SDE shifts toward the southeastern urban area and the share of identified keywords highly related to experience consumption increases; (2) the city tends to be more "leisurely and carefree" in tourism, as SDE tends to be more concentrated in the urban area with a relatively high density of leisure attractions; and (3) the cognitive image responds to natural hazards promptly, as the size and directions of SDE vary accordingly, and the share of identified keywords related to public infrastructure, tourism infrastructure, and tourism environment reached a peak after the Wenchuan earthquake. Based on our findings, the mechanism forming Chengdu's cognitive image was further discussed from the perspectives of government, residents, and commercial organizations. Methodologically, this study proposes an approach based on text mining and analysis of online travel, typical spatial big data generated by tourists, to examine the cognitive image, which could be applied to other tourism destinations. Moreover, the mechanism framework based on the Chengdu case provides recommendations on tourism destination image management and marketing to improve responses to tourists' changing expectations regarding other tourism destinations. [ABSTRACT FROM AUTHOR]

To improve the throughput and energy efficiency of wireless sensor network ( WSN) in intelligent transportation system (ITS), this paper proposed a cooperative multiple input multiple output automatic repeat request protocol with spatial modulation( CMIMO-SM-ARQ). It considered a four-node WSN with dual sending nodes and dual receiving nodes, in which both receiving nodes could act as relays to each other to assist the sender transmitting data, to reduce the probability of system outage. The paper established the discrete time Markov chain ( DTMC) model of CMIMO-SM-ARQ protocol with 3L + 1 states and gave the state space. Based on the outage probability of WSN and the one-step state transition probability matrix, it derived the analytical expressions of throughput, energy efficiency and delay of CMIMO-SM-ARQ protocol. Numerical simulation results show that the outage probability and energy efficiency of the proposed protocol are better than the single input single output automatic repeat request ( SISO-ARQ) protocol, and the CMIMO-SM-ARQ protocol has a higher throughput and lower delay when transmitting information at medium and long distances( over 67 m). [ABSTRACT FROM AUTHOR]

Based on the summary and analysis of the data reported by individual academic library in the fact database of Chinese academic libraries, this paper reveals the development of academic libraries of China in 2020 from five aspects: collection development budget, library building acreage, human resources, collection utilization and information literacy education. [ABSTRACT FROM AUTHOR]

In the past, when researchers studied the selection of third-party logistics suppliers ( 3PLS), it was generally assumed that third-party logistics suppliers have a risk-neutral attitude towards fourth-party logistics integrators( 4PLI), which is often inconsistent with reality. In order to make the research more realistic, considering that the third-party logistics providers have a risky attitude, the fourth-party logistics integrators select the third-party logistics suppliers through a multi-attribute reverse auction. Through case design and related experiments, it is found that the risk attitude is measured by the risk measurement method of conditional value at risk ( CVaR), which integrates risk factors into the multi-attribute reverse auction, breaking the traditional assumption that the fourth-party logistics integrators assume risk neutrality when selecting them. Moreover, the commonly used CVaR method in risk measurement is integrated into supplier selection, which is innovative . Comparing different levels of risk aversion and risk neutrality, the result shows that 4PLI is the most beneficial when 3PLS is risk-neutral, and when 3PLS is under risk aversion, the lower the degree of risk aversion, the more beneficial it is for 4PLI. [ABSTRACT FROM AUTHOR]

There are various etiologies for extrahepatic bile duct stenosis, and pharmacotherapy and endoscopic intervention can achieve a good clinical effect in benign stenosis. Early diagnosis and timely surgical treatment of malignant stenosis may prolong the survival time of patients. However, there are still difficulties in the differential diagnosis of malignant bile duct stenosis. This article reviews the application of serology, radiology, endoscopic techniques, and artificial intelligence in the differential diagnosis of malignant bile duct stenosis, so as to provide strategies and references for formulating clinical diagnosis and treatment regimens. [ABSTRACT FROM AUTHOR]

Objective To study the expressions of BMALl and CerbB-2 genes in nasopharyngeal carcinoma (NPC) and their related mechanisms. Methods Plasmid transfection. MTT, RT-PCR and Western blotting were used to detect the proliferation of NPC cells. the expressions of BMALl and CerbB-2 genes and proteins and the expression of NF-ıB signaling pathway. Results The MTT results showed that BMAL1 and CerbB-2 could affect the proliferation of NPC cells. RT-PCR results showed that BMALl gene was significantly down-regulated in NPC (CK:2.24±0.22, NPC:0.63±0.11, P

This paper aims to guide users and peers to better understand the remarkable progress of the East Building's reconstruction from the details of infrastructure, space arrangement, furniture design, exhibit ion selection and so on, and expounds the innovations of concept, service and design that cause these positive changes. The spatial reconstruction of the East Building is an important achievement made by Pe- ~ king University Library in the process of developing a first-class literature center, a first-class platform for ! education and a first-class cultural hall. [ABSTRACT FROM AUTHOR]

The sudden global outbreak of COVID-19 makes 2020 to be the most challenging year! Facing the severe inner and outer challenges, Chinese academic libraries pay more attention to formulate strategic plan, in order to maintain stable development and draw the blueprint for the future, From December 14 to 16, 2020, the 3rd Conference of the Steering Committee for Academic Libraries of China from 2018 to 2022 was held in Peking University, the theme of the conference is the 14th Five-Year Plan of Chinese academic libraries, The conference participants learned and understood the spirit of the 5th plenary session of the 19th Central Committee of the Communist Party of China(CPC) and the CPC Central Committee's Proposals for Formulating the 14th Five-Year Plan for National Economic and Social Development and the Long Range Objectives Through the Year 2035, Moreover, the conference conveyed the new policy and strategy on higher education of the Ministry of Education in China, On the basis of in-depth understanding of the above important national strategic policies, the goal of development of Chinese academic libraries has been clarified. That is, how to link up with the national strategic plan, how to integrate into the overall situation of higher education, and how to formulate scientifically the 14th Five-Year Plan of academic libraries.This paper summarizes the contents and highlights of this conference, and discusses the paths and methods of scientifically formulating the 14th Five-Year Plan of Chinese academic libraries from the macro, middle or micro level, so as to provide useful guidance for the long-term development of Chinese academic libraries in the near future, [ABSTRACT FROM AUTHOR]

Objective To explore the effects of serum biochemical markers of bone metabolism on fracture risk in middle_aged and older people with abnormal bone mass by analyzing the relationship between serum biochemical indexes of bone metabolism and FRAX fracture risk value. Methods Bone mineral density (BMD) and serum biochemical indicators of bone metabolism were detected, and the probability of fracture in 10 years were calculated using FRAX tool in 84 middle_aged and elder subjects with osteopenia or osteoporosis. All the subjects were divided into high_risk group and low_risk group according to FRAX calculation result . Student t_test was used to compare the differences of age, gender, body mass index, proportion of osteoporosis subjects, BMD of the femoral neck, hip or lumbar spine, and biochemical indexes of semm bone metabolism between the two groups. Pearson or Spearman correlation analysis was used to understand the correlation between clinical indexes and FRAX fracture probability. Logistic regression was used to evaluate factors influencing FRAX fracture risk. Results The age and the proportion of osteoporosis patients in the high_risk group were significantly higher than those in the low_risk group. BMD of the femoral neck or hip and the semm level of 25 hydroxyvitamin D3 in the high_risk group were significantly lower than those in the low_risk group (P< 0.05). The median, maximum, and minimum values of 25 (OH) D3 in high_risk group and low_risk group were 20. 61 ( 12. 19_43. 24) and 29. 97 ( 11. 91_72. 70) , respectively. Age was positively correlated with the probability of two fractures. BMD of the femoral neck or hip and the serum level of 25 (OH) D3 were negatively correlated with the probability of two fractures (F<0. 05). The correlation coefficient r value between the level of 25 (OH) D3 and the probability of two fractures was _0.51. Logistic regression analysis showed that BMD of the femoral neck and serum 25 (OH) D3 were important factors related to FRAX fracture risk. Conclusion Serum 25 ( OH) D3 may be a sensitive marker of bone metabolism for predicting the risk of osteoporotic fracture in middle_aged and elder people with osteopenia or osteoporosis. [ABSTRACT FROM AUTHOR]

The sea buckthorn fruit (Hippophae rhamnoides) oil is medically claimed as having phytoantioxidant, antiinflammatory, and anticancerous properties in humans. To explore the hydrogen peroxide of the sea buckthorn fruit oil on mouse monocyte macrophages(RAW264.7 cells)oxidative damage model. By spectrophotometry, scavenging effects of sea buckthorn fruit oil on DPPH free radicals; In vitro antioxidant activity was assessed on RAW264.7 cells against hydrogen peroxide(H2O2)induced cytotoxicity. The antioxidant effect was determined by measuring the cell dye MTT[3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] reducing assay. Then the survival rate of RAW264.7 cells was determined by MTT assay, and the expression of superoxide anion was determined by flow cytometry labeling with dihydroethidium(DHE). The results were as follows:(1)Compared with the antioxidant capacity of vitamin C, when the concentration of sea buckthorn fruit oil was less than 4.9%, the antioxidant capacity of sea buckthorn fruit oil was higher than vitamin C.(2)Comparing to the H2O2 group, 3.125% sea buckthorn fruit oil group had higher survival rate(P<0.01).(3)Comparing to the H2O2 group, the proportion of DHE-positive cell was significantly decreased in the same time(P<0.01)and it was negative effect with concentration of sea buckthorn fruit oil, the proportion of DHE-positive cell was significantly increased at the same concentration(P<0.01), and which was related positive effect with concentration of sea buckthorn fruit oil(P<0.01). These results support the protective effects of sea buckthorn fruit oil against hydrogen peroxide-induced toxicity in vitro with the underlying mechanisms of inhibiting oxidative stress. Taken together, these results clearly indicate that sea buckthorn fruit oil has significant potential as a natural antioxidant agent, which could be a potential source for the discovery of natrual antioxidant health product. [ABSTRACT FROM AUTHOR]

Objective To explore the effect of lifestyle intervention on metabolic indexes in rural patients with type 2 diabetes mellitus. Method Ten natural villages in Chaoshui Town, Penglai City, Shandong Province were randomly selected to screen the villagers over 50 years old. With the natural village as a group, 12 T2DM patients (a total of 120) were randomly selected from each group as the object of study. All the subjects were given life style intervention, and the differences of waist circumference, blood pressure, body mass index (BMI), motor function, body composition, fasting blood glucose and glycosylated hemoglobin A1c(HbA1c) were compared before and 3 months after intervention. Paired t‐test was used to analyze the related data. Result A total of 108 subjects completed the experiment. After lifestyle intervention, the waist circumference, BMI, fasting blood glucose and HbA1c decreased significantly (t=1.84 to 10.02,all P<0.01). The indexes of motor function and body composition (lower limb muscle distribution coefficient, fat distribution, lower limb nerve and body reaction speed, etc) after intervention were significantly improved as compared with those before intervention (t=-10.64 to 9.56, P<0.01). Conclusion Lifestyle intervention can significantly improve the metabolic indexes of rural patients with type 2 diabetes, such as waist circumference, BMI, HbA1c, body composition, exercise function and so on. [ABSTRACT FROM AUTHOR]

目的探讨全面护理干预在呼吸重症监护病房（ICU）鼻饲患者治疗中的应用效果。方法选取 2016 年 7 月至 2018 年 12 月该院收治的呼吸 ICU 鼻饲患者 70 例，随机分为干预组和常规组，每组35例。常规组采用病情观察、生命体征监测、导管护理、康复指导训练等常规护理，干预组在常规护理基础上采用全面护理干预。2 组均干预至患者出院，收集并分析2组患者 ICU 治疗时间、住院时间、生活质量变化、护理满意度及并发症发生情况。结果干预组患者住院时间、ICU 治疗时间均明显短于常规组，护理后一般健康状况、生活能力、生理职能、情感职能、躯体疼痛、生理功能、精神健康、社会功能评分，以及护理满意度均明显高于常规组，并发症发生率明显低于常规组，差异均有统计学意义（P<0.05）。结论全面护理干预能提高呼吸ICU鼻饲患者生活质量，缩短 ICU 治疗时间及住院时间，值得临床推广使用。 [ABSTRACT FROM AUTHOR]

Based on not only the survey report of the academic libraries services during the period of prevention and control of COVID-19 epidemic, which were written by the steering committees for academic libraries of 29 provinces, autonomous regions and municipalities directly under the central government in China, but also 11 university libraries' reports on how to support massive online teaching during this period, this paper summarized a series of emergency measures and innovative services for protecting the health of readers and librarians and ensuring the smooth development of online teaching and research in colleges and universities of China during the period of prevention and control of COVID-19 epidemic. [ABSTRACT FROM AUTHOR]

Objective: To study the clinical efficacy of total knee arthroplasty (TKA) in the treatment of knee osteoartlmtis (KOA) and its effect on the serum Superoxide dismutase (SOD), nitric oxide (NO), tumor necrosis factor (TNF-α) levels. Methods: 94 patients with KOA who admitted to our hospital from August 2014 to January 2016 were selected, they were divided into the control group and the observation group with 47 cases in each group by the random number method. Patients in the control group were treated with traditional conservative medicine, while patients in the observation group were treated with TKA and followed up for 1 year. The therapeutic effects, changes of knee joint score (AKS), visual analogue score (VAS) and serum SOD, NO and TNF-α levels before and after treatment were compared between two groups. Results: After treatment, the excellent and good rate of observation group (93.61 %) was significantly higher than that in the the control group (65.96%)(P < 0.00). After 1 year of follow-up, the VAS score of observation group was significantly lower than that of the control group (P<0.01), the knee score and functional score of AKS were significantly higher than those of the control group (P<0.01), the serum SOD level was significantly higher than that of the control group (P<0.01), and serum NO and TNF-α levels were significantly lower than those of the control group (P<0.01). Conclusion: The operative effect of TKA on KOA patients is significantly be甘er than that of traditional conservative medicine, which can significantly reduce the pain sensation of knee joint and promote the recovery of knee joint function. The mechanism may be related to the increase of serum SOD level and the decrease of serum NO and TNF-α levels. [ABSTRACT FROM AUTHOR]

For the problems in the practice teaching, the reform of electronic practice teaching based on outcomes-based education (OBE) concept is implemented to meet the requirements of engineering education program accreditation. Based on the student-centered, the engineering project is taken as a carrier to cultivate the knowledge, ability and quality of the students. A progressive three-level system which consists of basic experiment, design experiment and research experiment is designed. The basic experiment teaching emphasizes to cultivate knowledge. The design experiment teaching is to emphasize the cultivation of practical ability and innovative spirit. In research experiment teaching, cultivation of comprehensive quality is emphasized. A quality evaluation system is designed to guarantee the quality and continuous improvement of the practice teaching. The practice in recent years shows that the comprehensive quality of the students is significantly improved. [ABSTRACT FROM AUTHOR]

Objective：To select the differential prognostic lactic acid metabolism-related genes (LRGs) of the head and neck squamous cell carcinoma (HNSCC) to construct the LRGs prognostic model of HNSCC, and to clarify the potential mechanism. Methods：The HNSCC gene expression and clinical data were obtained from The Cancer Genome Atlas (TCGA) and Gene Expression Omnibus (GEO) Databases, the LRGs were identified through GeneCards Database, and R software was used to screen out the LRGs of HNSCC； univariate Cox regression analysis was used to identify prognosis-related genes； two different subtypes were identified based on the prognostis-related LRGs； Kaplan-Meier (K-M) curve analysis was used to compare the prognosis of the patients between two groups； CIBERSORT algorithm was used to perform the immuno-correlation analysis between two groups；multivariate Cox regression analysis and LASSO regression analysis were used to construct the prognostic model； receiver operating characteristic curve (ROC) and K-M survival curve were used to assess the relationship between LRGs and survival and prognosis of the HNSCC patients. The prognostic model was validated by GSE27020, GSE41613, and GSE65858 datasets. The experiment were grouped based on risk score, and immune-related analysis and tumor score analysis were performed. Results：The TCGA Database differential analysis results showed that 1 196 LRGs were identified from HNSCC samples； univariate Cox regression analysis selected 27 differentially expressed genes (DEGs) associated with the prognosis of the HNSCC patients. Two different LRGs subtypes (Group 1 and Group 2) were identified according to the prognosis-related genes. The K-M survival curves results showed that the overall survival (OS) of the patients in Group 2 was significantly higher than that in Group 1, and the immune cell expression amount of the patients in Group 2 was also higher than that in group 1. The multivariate Cox regression and LASSO regression analysis results screened out 9 LRGs, including hypoxanthine phosphoribosyltransferase 1 (HPRT1), amyloid precursor protein (APP), glycogen phosphorylase L (PYGL), urokinase-type plasminogen activator (PLAU), cannabinoid receptor 2 (CNR2), stanniocalcin 2 (STC2), nucleotide binding oligomerization domain-like receptor protein 1 (NLRP1), integrin-linked kinase (ILK), and forkhead box B1 (FOXB1); the prognostic model was constructed. The K-M and ROC curve results indicated that the expression levels of above 9 genes were associated with the survival and prognosis of the HNSCC patients, providing good 1-year, 2-year, and 3-year survival prediction effect, and the area under ROC curve (AUC) values were all greater than 0. 650. Furthermore, the predictive ability of the prognosis model was validated in GSE27020, GSE41613, and GSE65858 datasets. The patients classified based on the risk scores had distinguishable immune statuses. Conclusion : The differentially expressed LRGs of HNSCC screened by bioinformatics methods are related to the survival and prognosis of the HNSCC patients； the prognostic model constructed by 9 LRGs can predict the survival status and treatment response of the HNSCC patients. [ABSTRACT FROM AUTHOR]

心房扑动是临床急症, 多伴有器质性心脏病, 需加以控制. 但有些心电干扰会被误 诊为心房扑动. 本文报告 １ 例肌张力增高致酷似Ⅱ型心房扑动样改变的窦性心律心电图. [ABSTRACT FROM AUTHOR]

In order to solve the problem that Black Widow Spider Optimization Algorithm (BWOA) global exploration and local development are difficult to coordinate, slow convergence speed and easy to fall into local optimization, this paper proposes a Black Widow Spider Optimization Algorithm based on Chi-Square Transition Mechanism (CTBWOA). First of all, the initial species solution is generated according to the Good Point Set, which lays the foundation for global search for diversity. Secondly, a Chi-square Transition Mechanism is proposed to help black spiders jump out of the local optimization and avoid premature convergence of the algorithm. Then, through self-selecting motion strategy, this can help black spider to select appropriate motion strategy in different periods, so as to balance the exploration and development ability of the algorithm. Finally, the competition and backtracking mechanism of three spiders are adopted to increase the population diversity and improve the convergence speed of the algorithm. The simulation experiments of CTBWOA algorithm and other five species intelligent algorithms are carried out in 12 standard tests. the results show that the improvement of BWOA algorithm can effectively improve the convergence speed and accuracy of the algorithm. The CTBWOA algorithm is applied to the parameter optimization of support vector machine (SVM). Simulation experiments on UCI′s 7 standard data sets and Wisconsin breast cancer data sets. The experimental results show that the parameter setting of SVM is more accurate and the classification accuracy is improved after CTBWOA optimization. This further demonstrates the effectiveness of the improved algorithm. [ABSTRACT FROM AUTHOR]

目的探讨风险评估护理体系在心脏移植手术患者中的应用价值。方法选取2017年3月至2019年2月该院收治的心脏移植手术患者58例。采用随机数字表法分为观察组和对照组,每组29例。观察组采取风险评估护理体系。对照组采取常规护理。统计2组患者生活质量量表、不良事件发生率等指标。结果2组患者均手术成功,均未出现恶性死亡事件。观察组患者不良事件发生率明显低于对照组,生活质量量表各项评分及总分均明显优于对照组,差异均有统计学意义(P<0.05)。结论针对心脏移植手术患者采取风险评估护理体系可有效降低不良事件发生率,改善患者生活质量,值得在临床推广应用。 [ABSTRACT FROM AUTHOR]

Aiming at the problems in the teaching of electronic technology curriculum design, the reform based on outcomes-based education concept is implemented to meet the requirements of engineering education accreditation. Firstly, teaching objectives of electronic technology curriculum design are made according to automation graduation requirements. Secondly, CDIO-based project teaching mode is carried out in the teaching reform. A whole project is divided into four processes to complete. The four processes are project analysis and scheme comparison, scheme design, scheme implementation, summary and show of the designed project. Ability training and quality education are included in the teaching activities. The evaluation of the curriculum is the achievement of teaching objectives, which is learning outcomes oriented. The practice in recent years shows that the comprehensive engineering training and quality of the students are greatly improved. That contributes to improve the comprehensive quality of the students. [ABSTRACT FROM AUTHOR]

目的 观察柴胡加龙骨牡蛎汤加减治疗抑郁症的临床疗效。方法 抑郁症患者200例,分为对照组和观察组各100例。对照组给予帕罗西汀治疗,观察组给予柴胡加龙骨牡蛎汤加减治疗。分别于治疗前及治疗后2、4、6、8周采用汉密顿抑郁量表(HAMD)评价抑郁情绪,采用抑郁自评量表(SDS)评价抑郁程度,并进行中医证候评分。根据治疗前、治疗8周后HAMD评分减分率判定疗效。结果 两组治疗后2、4、6、8周HAMD评分、SDS评分、中医证候评分均低于同组治疗前,且观察组治疗后不同时点评分低于对照组(P均<0.05)。观察组治愈17例、显效40例、有效36例、无效7例,总有效率为93%;对照组治愈13例、显效34例、有效37例、无效16例,总有效率为84%。观察组治疗总有效率高于对照组(P<0.05)。结论 柴胡加龙骨牡蛎汤加减治疗抑郁症疗效确切,可有效改善抑郁症患者的临床症状。 [ABSTRACT FROM AUTHOR]

【Objective】 XZ-2 was a Paenibacillus polymyxa isolated from the healthy soybean plant. The experiments were carried out in order to make the biological properties and the biological control efficiency against 3 soybean diseases clearly. 【Method】 Single factor experiment was used for the biological characteristics of XZ-2. Plate confrontation culture and microscopic observation were used for the antagonism experiment of XZ-2 against 3 pathogens including Soybean Phytophthora, Anthracnose and Sclerotinia sclerotiorum. 【Result】 The suitable pH for XZ-2 was from 6-8, and it could grow well in LB medium with Na Cl concentration between 0-15 g/L. XZ-2 could grow well in brightness, darkness, and alternating light-dark, so it is not susceptible to light. The lethal temperature of XZ-2 was 100 °C, 10 min. Meanwhile, XZ-2 showed antagonistic effect against Phytophthora sojae, Glomerella glycines and Sclerotinia sclerotiorum, and the diameters of inhibition zone were 22.3, 24.2 and 23.6 mm, respectively. Moreover, the hyphae morphology were examined by microscope and the results showed that the fermentation liquid of XZ-2 could strongly inhibit the hyphae of 3 soybean phytopathoges which caused swell, deformation and branches increase. Finally, the spores germination of G. glycines were examined, the spores germination were checked after 24 hours and the control group could germinate normally while the experimental group could not geminate, which illustrated that XZ-2 could inhibit the spores germination of G. glycines. 【Conclusion】 Our research indicated that XZ-2 had a very good potential for biological control against 3 soybean diseases, and deserved the further studied and industrialization. [ABSTRACT FROM AUTHOR]

Since air-ground channel and orthogonal frequency division multiplexing/offset quadrature amplitude modulation (OFDM/OQAM) system have the fast time-varying characteristic and intrinsic interference characteristic respectively, this paper proposed a channel estimation algorithm. This algorithm contained a novel comb-pilot and an improved linear interpolation algorithm. The novel comb-pilot could eliminate the intrinsic interference of the system and reduce the influence of the intercarrier interference (ICI) on the channel estimation by zero-padding around the pilot, and the pilot was distributed over the whole time axis,so it could track the channel state better. And the improved linear interpolation algorithm could reduce the influence of channel noise and interference on channel estimation by zero-padding in the time domain. Simulation results show that the novel comb-pilot has better advantages compared to the conventional comb-pilot.which can effectively improve the bit error rate(BER) performance of the system.and the improved linear interpolation algorithm can effectively improve the reliability of the system compared to the traditional interpolation algorithm. [ABSTRACT FROM AUTHOR]

Diabetes mellitus is a common clinical chronic metabolic disease. It is the major cause of blindness， kidney failure， heart attack， stroke and lower limb amputation. The mortality rate is increasing year by year. It is predicted that diabetes will become the seventh leading cause of death in 2030. Therefore， the prevention and treatment of diabetes is crucial. In recent years， relevant research at home and abroad shows that health education of diabetes can help patients and their families and high-risk groups master the knowledge of prevention and treatment of diabetes， raise their awareness of self-care， improve the visiting rate， reduce and delay the occurrence of complications，prolong the life expectancy，reduce the mortality of diabetes and improve the quality of life of patients with diabetes. Health education as one of five measures to prevent and treat diabetes has played an important role in the prevention and treatment of diabetes. The object， content，function and mode of diabetes of health education are reviewed. [ABSTRACT FROM AUTHOR]

The original K-means clustering algorithm is seriously affected by initial centroids of clustering and easy to fall into local optima. So this paper proposed an improved K-means clustering based on adaptive cuckoo search, and achieved the parallelization of the improved algorithm using MapReduce programming model. It implemented accuracy experiments and efficiency experiments 10 times respectively on Hadoop platform for every different data sets, the experimental results show that; a)compared with the original K-means algorithm and PSO-Kmeans, the average accuracy of clustering improved in the experiments which test on four UC1 standard data sets;b) tested the average execution efficiency of clustering in the experiments which test on five random incremental data sets, when the amount of data was very large, significantly better than original K-means algorithm, slightly better than PSO-Kmeans. It can be concluded that the algorithm can be applied to large data clustering, and will play a significant effect. [ABSTRACT FROM AUTHOR]

With the privacy issues drawing more and more concerns, privacy protection techniques based on Computational Private Information Retrieval (CPIR) allow a user to retrieve data from a service provider without revealing the users query information. For large-scale applications, there exists a gap between privacy protection techniques and its feasibility. For the problem that the CPIR algorithm needs long computing time so as not to be suitable for large-scale data privacy protection, this paper proposes a CPIR nearest neighbor privacy protection algorithm (H-PCPIR-V) based on Spark and Huffman code. The H-PCPIR-V algorithm partitions the spatial data into Voronoi diagrams according to the points of interest in the data preprocessing stage, and then utilizes the Huffman code to compress the candidate data in order to reduce bit computation operation. Spark parallel framework is used for query grid parallel computing in the server side. The experimental results show that the computational cost of H- PCPIR V algorithm is about 30M lower than that of PCPIR-V algorithm on the server side, the computational cost of client is about 10% lower, and the communication cost is about 40% lower. [ABSTRACT FROM AUTHOR]

Rock rheological deformation easily occurs in the surrounding rock of deep soft rock tunnel,and is very sensitive to external perturbation effect.To study the law of deformation while rock under different rheological state and influence of external perturbation effect,on the basis of the previous two models,the RRTS-III rock rheological perturbation effect triaxial test system is developed.The host provides a long-term stable axial pressure for the test,and uses the gear and hydraulic expansion structure,while the expansion ratio is 1∶100.The oil filled triaxial cell can provide a long-term stable confining pressure.The design principle of the chamber structure is based on oil gas separation.Hydraulic pump can provide a maximum 50 MPa pressure,its accuracy is 0.1MPa.The improved shock perturbation loading device has a high maneuverability.According to the principle of shock,the IEPE dynamic force sensor is designed,the range are 0-10 000 N,the sensitivity is 0.497 mV/N.The sensor can accurately measure the size of single actual perturbation load,and it is equipped with automatic monitoring system,including load,displacement,strain and vibration of 4 data acquisition instrument and processing software.The triaxial test system for rock rheological perturbation effect is used to test the uniaxial rheological perturbation test and triaxial rheological test.The test procedure is simple,and the data is reliable. [ABSTRACT FROM AUTHOR]

In order to enhance forecasting precision for the vertical displacement of supporting structure, this paper proposed an improved least-squares method model. By using the modified data taken from the traditional least-squares method model, an improved least-squares method model was built based on the pre-settlement value，which ensured the original dimensionality and retained the settlement growing trend of the whole information. Taking the foundation pit supporting structure of composite steel soil-cement mixed diaphragm wall as a study project case, the improved least-squares method was used to study collected monitoring data, and the fitted curve of the displacement of the supporting structure was obtained and further obtained the fitted value. The results show that the absolute error of the improved least-squares method is smaller than that of the traditional least-squares method, and the prediction accuracy is improved. The improved least-squares method model not only ensures the original dimensionality, but also retains the growing trend of the whole information, which is more suitable for the prediction of the supporting structure with complex surrounding environment. [ABSTRACT FROM AUTHOR]

[Objective] For subsequent transgenic study on multi-functional cellulase gene (Mfc) in Auricularia polytricha, its cloning and codon optimization were performed. [Method] The biosoftware of CodonW was used to analyze the differences of codon usage between Mfc gene in Ampullaria crossean and CDS in A. polytricha, and codons of Mfc gene in A. Crimean were optimized based on characteristic codon usage of CDS in A. polytricha. [Result] The GC content of optimized Mfcsg sequence increased from 54. 04 % to 58. 16 % , which was in accordance with A. polytricha genetically. [ Conclusion] The GC content of optimized Mfcsg sequence was in accordance with A. polytricha genetically. No hairpins, direct repeats and inverted repeats were detected in the optimized Mfcsg sequence, which indicated that this sequence was able to be used as heterologous gene for the transgenic study of .4. polytricha. [ABSTRACT FROM AUTHOR]

BACKGROUND: Intramedullary nail is a classical scheme for the treatment of femoral shaft fracture. Its distal aiming frame is widely used in the placement of distal locking nail, which improves the accuracy of distal locking nail placement, but its failure rate cannot be ignored. It is urgent to develop a new technology that can actualize the rapid and accurate locking of distal locking nail and reduce the X-ray radiation damage of bare-handed locking nail. OBJECTIVE: To compare the effect of place-occupying compression rod technique and bare-hand locking nail technique in distal locking nail placement of femoral intramedullary nail. METHODS: The eight model bones with the deviation of the compression rod that could not be accurately placed into the distal locking nail were divided into two groups. The place-occupying compression rod group (n=4) adopted the place-occupying compression rod technology. After drilling the hole adjacent to the original pressure rod hole, the accurate pressing rod was carried out, and then the distal locking nail placement carried on. In the bare-hand locking nail group (n=4), the technique of bare-hand nail under the supervision of C-arm was used to complete the placement of locking nail in the distal locking hole. The X-ray exposure times, nail locking time and nail placement accuracy were compared between the two groups. RESULTS AND CONCLUSION: (1) The number of X-ray exposure in the place-occupying compression rod group was significantly less than that in the bare-hand locking nail group (P < 0.05). The time of locking nail in the place-occupying compression rod group was significantly shorter than that in the bare-hand locking nail group (P < 0.05). The accuracy of nail placement in both groups was 100%. (2) The results showed that the technique of place-occupying compression rod and the technique of bare-hand locking nail could complete the placement of distal locking nail accurately, and the technique of place-occupying compression rod has the advantages of shorter operation time and less X-ray radiation compared with the technique of bare-hand locking nail. [ABSTRACT FROM AUTHOR]