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Background The elderly are at high risk for COVID-19 and incontinence, as well as a vulnerable population for incontinence-associated dermatitis (IAD). There has been a continuous exploration of how to provide good incontinence care to improve the effectiveness of preventing and treating IAD. Objective To investigate the effectiveness of two incontinence care plans based on guidelines for elderly COVID-19 patients with incontinence, in order to provide a reference basis for good incontinence care and prevention of IAD in such patients. Methods Using an exploratory intervention study design, 60 eligible patients with COVID-19 were selected as the study subjects from the surgical and internal medicine departments of Eastern Theater General Hospital, PLA, Daping Hospital, Amy Medical University, PLA, and Sir Run Run Hospital, Nanjing Medical University from December 26, 2022 to March 30, 2023. The study subjects were nonrandomly divided into the intervention group and control group, with 30 patients from the Eastern Theater Command General Hospital of PLA included in the intervention group and 30 patients from the other two hospitals included in the control group. Patients with IAD in both groups were also included in the intervention and control subgroups. The characteristics and types of incontinence in elderly COVID-19 patients were analyzed, the "AIMS Four Step Improved Incontinence" care plan (AIMS care plan) for the assessing incontinence and skin (A), identifying and managing risk (I), managing incontinence (M), and skin care (S) was modified based on the recommendations of the guidelines. The intervention group adopted the modified AIMS care plan, while the control group adopted a structured skin care plan, with continuous intervention for at least 14 days. The skin was inspected every shift and international standards were used to determine the occurrence of IAD and changes. The primary outcome indicator was the incidence of IAD in both groups of patients, and the secondary outcome indicators were the healing rate and healing time of IAD. The relevant clinical data of the two groups before and after intervention was collected and compared. Results The general data of the both groups of patients showed no statistically significant differences, which included gender, age, types of incontinence, frequency of incontinence, chronic comorbidities, serum albumin, hemoglobin, blood glucose, pulse oxygen concentration, and Braden scores (P>0.05). The incidence of IAD in 60 elderly COVID-19 patients with incontinence was 33.3% (20/60), of which the incidence of IAD was 43.3% (13/30) in the control group and 23.3% (7/30) in the intervention group; There was no statistically significant difference in the incidence of IAD between the two groups of patients (P>0.05). There was no statistically significant difference in the grading, and healing rate of IAD between the two subgroups of patients (P>0.05). Patients in the intervention subgroup had a delayed time to IAD occurrence (t=3.225, P=0.005), shorter time to IAD healing (t=2.644, P=0.020), and shorter hospitalization time (t=4.364, P

Objective: This study aimed to promote the deep development of safflower seed oil. Methods: Taking sterilization rate as an index, safflower seed oil/dragon fruits juice emulsion was treated by different processing distance, voltage and time. Response surface methodology was used to establish the conditions for low temperature plasma （LTP）sterilization of emulsion. The changes of physicochemical indexes (vitamin C and anthocyanin content, particle size and ζ potential, peroxide value and acid value) during storage were compared between thermal sterilization (at 80 ℃ for 20 min) and LTP sterilization. Results: The optimized process conditions of LTP sterilization were treatment distance at 5.1 cm and voltage of 6.4 kV for 151.0 s. Under the control of these conditions, the sterilization rate reached 98.2%. After storage for 20 days, the retention rate of vitamin C and anthocyanin in LTP-treated emulsion was higher than that in heat-treated emulsion, and the particle size was smaller than that in heat-treated emulsion; The ζ potential was higher than that in heat-treated emulsion, and the difference was significant（P＜0.05）. However, the difference of peroxide value and acid value was not significant. Conclusion: LTP treatment can not only effectively kill the microorganisms in the emulsion, but also maintain the quality of emulsion better than heat treatment, and the invention relates to a new method for sterilizing the safflower seed oil/dragon fruits juice emulsion.

As the development of oil and gas enters a high water cut stage, the formation water environment with high Ca2+ and Cl- poses higher requirements for the safe service of pipe columns. In this work, the influence of Ca2+ concentration and exposure time on the corrosion behavior of 3Cr steel was analyzed by using high temperature autoclave to simulate the downhole flow environment and combining with the electrochemical research results. Research results showed that although the presence of Ca2+ could promote solution acidification, the corrosion rate of 3Cr steel in solutions containing Ca2+ depended more on the quality of the film on the sample surface. When the total Cl- concentration in the solution was 128 000 mg/L and the Ca2+ concentration ranged from 0 to 3 600 mg/L, the maximum average weight loss rate of 2.2 mm/a occurred at the Ca2+ concentration of 1 080 mg/L. Meanwhile, in an environment with a Ca2+ concentration of 180 mg/L, the weight loss rate curve of 3Cr steel showed an inverse “V” trend of weight loss rate over time, and the average weight loss rate of the sample reached the maximum value at the corrosion time of 240 h. When 3Cr steel was immersed in a solution containing Ca2+ with introducing CO2, the FexCa1-xCO3 compounds were formed on the surface of 3Cr steel. In addition, there was no strict ratio between Fe/Ca, and the product states depended on the Ca2+ concentration in the solution.

Background Considerable evidence suggests that people with depressive disorder are at higher risk for somatic symptoms than normal people, but the mechanisms of susceptibility are unclear. Some studies suggest that the levels of precursor of brain-derived neurotrophic factor (ProBDNF) and inflammatory cytokines in depressive disorder patients are higher, but it is still unclear whether this is related to the accompanying somatic symptoms. Objective To explore the characteristics of somatic symptoms, and their correlations with BDNF and inflammatory cytokines in patients with major depressive disorder (MDD) . Methods A total of 59 MDD outpatients and inpatients from Mental Health Department, First Hospital of Shanxi Medical University and 32 healthy volunteers from the community were recruited from February 2019 to December 2020. Somatic symptoms were diagnosed using the Somatic Self-rating Scale (SSS, SSS score >36 and SSS score ≤36 were defined as with somatic symptoms or without, respectively) . Depression was assessed using the Hamilton Depression Rating Scale (HAMD-17) . Clinical data were collected, including gender, age, years of education, HAMD-17 score, SSS score, absorbance of ProBDNF and BDNF, and inflammatory cytokines (CRP, IL-4, IL-10, IL-18, IL-23a, HMGB1, IL-6, TNF-α, IFN-α) . Spearman's rank correlation analysis was used to investigate the correlation of somatic symptoms (including dizziness and headache, frequent and urgency of urination, cardiovascular symptoms, muscle soreness, gastrointestinal symptoms, tingling and twitching of hands and feet, choking and sighing, blurred vision, and discomfort of the throat) , SSS-S factor score and HAMD-17 score with ProBDNF and BDNF, and inflammatory cytokines. Results MDD patients with somatic symptoms had higher total HAMD-17 score than those without (P

As a green and recyclable thermoplastic material, polypropylene (PP) has a good application prospect in high voltage cable line. However, its thermodynamic performance is difficult to directly meet the requirements of the cable line, so the PP material needs to be modified to meet the performance requirements. Therefore, based on molecular simulation technology, a nano-CaCO3/PP composite model with doping mass fraction of 3% and 7% nano-CaCO3 and doped grafted silane coupling agent was built, the data of thermal and mechanical properties were calculated, and the changes of its properties were analyzed from a microscopic perspective. The results show that the thermal and mechanical properties of the composites model with grafting number 2 improved the best. In terms of thermal properties, the glass transition temperature (Tg) value increased by 49 K, the free volume fraction decreased by 2.52%, and the thermal conductivity was the highest. In terms of mechanical properties, the rigidity decreased the most, and the toughness improved the most. [ABSTRACT FROM AUTHOR]

Objective: To classify banana ripeness quickly and accurately. Methods: Collect the bananas images of different maturity and establish gallery, using a variety of different neural networks as a classifier, banana feature extracting by migration study classifying banana six maturity level, access to the most suitable for banana maturity classification network model, network model, based on the improved and easily banana maturity real-time detection interface design, Finally, the feasibility and practicability of the model were verified. Results: AlexNet model was most suitable for banana maturity classification with the highest accuracy of 95.56%. AlexNet model was improved by modifying its full-connection layer structure, and the model accuracy was further improved by 1.11%. Conclusion: AlexNet model can quickly and accurately identify and classify bananas of different maturity.

Metabolic reprogramming is considered to be one of the top characteristics of tumor cells. Ample experimental studies have shown that microRNAs, which are a group of multifunctional non-coding RNAs, play an important role in the development of hepatocellular carcinoma (HCC) through lipid metabolic reprogramming. The current review briefly introduces the recent progress of specific microRNAs targeting at lipid metabolic reprogramming in HCC, which may provide a potential strategy for clinical targeting tumor therapy.

Objective To summarize the clinical manifestations, laboratory examination, imaging examination, genetic test, treatment and prognosis of scrub typhus combined with central nervous system (CNS) infection. Methods and Results The clinical data of 4 cases of scrub typhus encephalitis diagnosed and treated from October to November in Tianjin Huanhu Hospital were analyzed. The main clinical manifestations were eschar and lymphadenopathy (4 cases), headache (4 cases), nausea and vomiting (3 cases), fever (3 cases), rash (3 cases), and mental behavior disorder (3 cases); laboratory examination of hepatic in 3 cases were abnormality. Three patients underwent lumbar puncture of cerebral spinal fluid (CSF), including 3 cases with elevated pressure, 2 with elevated white blood cell count, 3 with elevated protein quantification, and 3 with abnormal immune function. Head MRI examination in 3 cases were normal, and one case showed a slightly linear hyperintensity of FLAIR in the bilateral occipital lobes. Metagenomic next⁃generation sequencing (mNGS) of CSF was completed in 3 patients, and Orientia tsutsugamushi was detected in all of them. All 4 cases were diagnosed as scrub typhus encephalitis and recovered after effective antibiotic treatment. Conclusions The clinical manifestations of scrub typhus combined with CNS infection are not specific, so it is necessary to be vigilant against the occurrence of scrub typhus in patients with CNS infection of unknown etiologys. In particular, scrub typhus should be considered during the epidemic season, if there is a history of farm work or suburban activities.

For improving the anti - corrosion performance of the mechanical galvanized layer, the centrifugal dipping was used to prepare the Ruspert coating and the Luxiubao coating on its surface independently. The surface morphology of the coatings was observed and analyzed with a metallurgical microscope. The cross - sectional morphology and element distribution of coatings were characterized by scanning electron microscope (SEM, equipped with EDS energy spectrum). The salt spray corrosion products of the coatings were analyzed by XRD, and the adhesive strength of the coatings was tested and analyzed through the cross - cut method. Moreover, the porosity of the coatings was tested by the filter paper method, and the corrosion resistance of the coatings was evaluated by the salt spray test. Results showed that the mechanical galvanized composite coating was composed of a mechanical galvanized layer and a coating prepared on it subsequently. The bonding interface between the mechnical galvanized layer and the coating had no pores, spallings or cracks. In addition, the two types of coatings were both formed by alternately stacked scaly Al. The salt spray corrosion products mainly included Zn5(CO3)2(OH)6, Mg4Al2(OH)14·3H2O, Al2SiO5, Zn4CO3(OH)6·H2O and ZnCO3. The adhesive strengthes between the two post - treatment coatings and the galvanized layer were good, and the surface porosity of the two coatings was zero. The time for the appearance of red rust for the Ruspert coating was 1 000 h, which was 650 h longer than that for the mechanical galvanized layer, while the time for the appearance of red rust for the Luxiubao coating was 1 500 h, which was 1 150 h longer than that for the mechanical galvanized layer. To sum up, the application of Ruspert and Luxiubao coatings on the surface of the mechanical galvanized layer could significantly extend the service life of the galvanized layer, and the effect of Luxiubao coating was better. The Ruspert and Luxiubao coatings had broad application prospects as post - treatment processes for mechanical galvanizing.

Metals such as Cu and Cr have good infrared reflection properties, but there are few reports on their effects on the optical properties of solar spectrum absorption layers. Herein, Cu and Cr infrared reflectors were deposited under AlCrNO absorbing layer by multi arc ion plating technology, and the effects of deposition parameters of infrared reflectors on coating properties were studied. The morphology, element composition and phase structure of the coating were analyzed by scanning electron microscope, energy dispersive spectrometer and X - ray diffraction. Results showed that compared with the coating without infrared reflection layer, the coating with Cu infrared reflection layer had the best performance, the absorptivity was increased by 1.7%, and the emissivity was reduced by 31.9%. Besides, the absorptivity and emissivity of coating with Cr infrared reflector were increased by 0.6% and 13%, respectively. Therefore, Cu was better than Cr as infrared reflector.

The purpose of this work was to reveal the effect of phosphating pre-treatment on the protective performance of water-based epoxy varnish coating on surface of aluminum alloy(AA).A phosphating film was firstly prepared on the surface of 2024 aluminum alloy by chemical conversion method for phosphating pre-treatment, and then the surface of aluminum alloy without and after phosphating pre-treatment was coated with water-based epoxy varnish.After the varnish was completely cured into a coating, the protective effect of water-based epoxy coating on aluminum alloy without and after phosphating pre-treatment was evaluated by electrochemical impedance spectroscopy(EIS).Finally, the effect of phosphating pre-treatment on the protective performance of water-based epoxy varnish coating and its mechanism were revealed.Results showed that the phosphating coating on surface of aluminum alloy had a uniform and dense columnar crystal structure, which was mainly composed of Zn3(PO4)2·4H2O.In 3.5%(mass fraction)NaCl solution, both the protective layer resistance(Rc)and the impedance module at low frequency(|Z|0.01)of the epoxy/AA(E/A)system and the epoxy/phosphating coating/AA(E/P/A)system decreased gradually with the extension of immersion time; however, both Rc and|Z|0.01 of the E/P/A system were always greater than those of the E/A system.On the other hand, due to the phosphating pre-treatment, the average adhesive force(Fa)of water-based epoxy coating on the surface of AA increased from 10.47 MPa to 15.58 MPa.Compared with the direct coating of water-based epoxy varnish without phosphating pretreatment on the surface of AA, the coating with phosphating pre-treatment before water-based epoxy varnish treatment changed the whole protective layer on the surface of AA from a single epoxy layer to a composite epoxy layer/phosphating coating, resulting in a significant increase in Rc and|Z|0.01.More importantly, the existence of phosphating film improved the adhesion of water-based epoxy coating on the surface of AA, and even fundamentally changed the fracture form of the whole protective layer.The combined effects of the above two aspects improved the protective effect of water-based epoxy varnish coating on AA substrate.Also, the mechanism of phosphating pre-treatment on improving the protective performance of water-based epoxy varnish coating was revealed.

Five metal nano powders of Fe, Cr, Mn, Ni and Ti were mixed by a planetary ball mill, and then three high entropy alloys of FeCrMnNiTi, FeCrMnNiTi0.5 and FeCrMnNi were prepared by vacuum casting technology. In order to investigate the corrosion behaviors of the three kinds of alloys in NaCl solution, the electrochemical workstation was used to measure the open circuit potential, polarization curve and AC impedance of the three alloys in 3.5%(mass fraction) NaCl solution. Furthermore, the microstructure of the corroded alloy was observed by using a metallurgical microscope and a scanning electron microscope. The electrochemical test results showed that when the self - corrosion potential of FeCrMnNiTi alloy was -0.301 V, the self - corrosion potential of FeCrMnNiTi0.5 alloy was -0.443 V. From the observation of corrosion product morphology, FeCrMnNiTi0.5 was dominated by grain boundary corrosion, and the other two alloys were dominated by pitting corrosion. Overall, FeCrMnNiTi had the best corrosion resistance and FeCrMnNiTi0.5 had the worst corrosion resistance. The addition of Ti might cause the alloy lattice distortion.

Transformative learning in medical education has been adapted in developed countries like UK and USA,and has achieved confirmed effects, such as medical students'attitude of learning and professional values acknowledgement during clinical management of diseases and patients, perception of medicine service in undeveloped areas and continues quality improvement of healthcare services. It is suggested that China may adapt the concept of transformative learning in medical education, pay special attention to the cultivation of medical students' competencies in critical thinking,systems-based practice, and appropriately introduce disorienting environment to challeng and stimulate studens'learning in order to optimize teaching effects.

In situ fast synchrotron computed tomography was used to investigate the semi-solid compression of nanoparticle-reinforced Al-10%(mass fraction) Cu composites. The three-dimensional images were used to quantitatively analyze the evolution of microstructure especially the micropores during semi-solid deformation process. The results show that the evolution of voids in nanoparticle-reinforced aluminum matrix composites during semi-solid compression has three main stages, namely the micropore closure stage, incubation stage and rapid growth stage. With the analysis of quantitative data and microstructure observation of void distribution in different deformation stages, semi-solid compressive deformation mechanism of aluminum matrix composites is further analyzed.The four-dimensional (three-dimension+time) study of Al-based composites under load using in situ synchrotron imaging technology provides a reference for exploring the semi-solid deformation behavior of aluminum matrix composites.

Objective To explore the application of online teaching of ultrasonic theory during the COVID-19 pandemic. Methods The standardized training of undergraduates, graduates and refresher doctors who have participated in the online theoretical teaching of ultrasound in the Peking University Third Hospital. Compared with the assessment results in previous years as the Objective index, the questionnaire was used as the subjective evaluation index. Results There was no significant difference between the experimental group and the control group. It is shown that 78.3% of learners belives that the online teaching method got better than the conventional offline teaching method. Conclusions The quality of online teaching is similar to that of conventional teaching mode but both trainers and trainees prefer the online teaching.

Objective To evaluate the anti-infective effect of polysaccharide isolated from fungus PH1008 in vaginal Candida albicans infection model of mouse,and to provide a new and potential pathway to the development of anti-candida drugs. Methods Determination of gene expression level of transcriptome in mice vagina after yeast infection mouse model was treated by exopolysaccharide of fungus PH1008. Results The expression of hepatocyte growth factor and complement 1 receptor was increased, and the up-regulation was related to varied signal transduction pathways. Conclusions The anti-infection effect of Candida albicans can be induced by vaginal mucosal immunization with exopolysaccharide of fungus PH1008, and the relevant mechanism needs further research.

Objective To evaluate learning outcomes of mind mapping with clinical symptom as theme in emergency ultrasound training. Methods The residents who were participated in standardized training were randomly divided into exprtiment group and control group. The control group received traditional emergency ultrasound training, while the experiment group received additional training about mind mapping with clinical symptom as theme on the basis of the control group. Before and after the training, Objective examination questions and film reading ability were evaluated. A questionnaire survey was conducted after the training, including comprehensive course evaluation and satisfaction with personal ability improvement. Results After the training, the score of experiment group was significantly higher than that of control group on Objectiveexamination questions and film reading ability (P＜0.05). The comprehensive course evaluation and satisfaction with personal capacity improvement of experiment group was higher than that of control group (P＜0.05). Conclusions The teaching method of mind mapping with clinical symptom as the theme improves diagnostic level by emergency ultrasound scanning as compared with which traditional emergency ultrasound training.

Facial Expression Recognition (FER) is usually affected by the collected environment, regions, race, and other factors. In order to improve the generalization of FER methods, Unsupervised Domain Adaption Facial Expression Recognition (UDA-FER) algorithms have attracted more and more attentions. Existing UDA-FER algorithms generally suffer from two issues: (1) they care more about the performance in the target domain, resulting in a sharp drop in the performance of the source domain after transferring from the source to the target domain; (2) They are just appropriate for the case of the single target domain. The UDA-FER methods will show terrible performance when applying it to multiple target domains directly. To solve the above issues, a Multi-Target Domain Facial Expression Recognition method based on class-wise feature constraint (MTD-FER) is proposed, which supports the FER methods transferring to multiple target domains in succession and ensures the methods retains a better recognition rate on each domain. To this end, MTD-FER designs the Class-Adaptive Pseudo Label methods (CAPL) and Class-Wise Feature Constraint mothods(CWFC), which learn pseudo labels for samples with high quality in target domains and align each class of features from disparate domains, so as to alleviate the issue of catastrophic forgetting resulting from domain transferring. Through extensive experiments using RAF-DB as the source domain and FER-2013 and ExpW as the target domains, the effectiveness of the MTD-FER algorithm is demonstrated. Experimental results show that, compared with the baseline method, MTD-FER improves the performance in the source domain by 6.36%, which is on par with the methods before transferring to target domains, and improves the performance by 27.33% and 3.03% in two target domains, respectively. [ABSTRACT FROM AUTHOR]

As the internet continues to evolve, technologies such as cloud computing and virtualization are widely deployed. Designing truthful auction mechanisms for cloud service providers to maximize social welfare through virtual resource allocation is one of the current research priorities in the field of cloud computing. Meanwhile, as server scales expand, many mainstream data center servers are transitioning to a Non-Uniform Memory Access (NUMA) architecture. Its primary feature is that each server can consist of multiple computing nodes, each node containing several processors and storage units, which can function as independent computing units or communicate with each other. However, current research primarily focuses on traditional Uniform Memory Access architectures and cannot adapt to the application scenarios of NUMA architectures. Therefore, a multi-resource truthful auction mechanism applicable to NUMA architectures is proposed, which allocates various resources in the form of virtual machines. Specifically, in resource allocation issues, a monotonic heuristic algorithm is proposed, considering deployment constraints and user request density advantages under this architecture, effectively enhancing social welfare. In terms of price payment issues, a binary method is used to design a price payment algorithm that conforms to the key price theory, thereby ensuring the mechanism's truthful features. Through experimental testing, the overall performance of this mechanism in social welfare, user payments, resource utilization, etc., achieves approximately 96% of the optimal solution. [ABSTRACT FROM AUTHOR]

The occurrence and development of tumors include the tumorigenicity of tumor cells in vivo, the growth of xenograft tumors, angiogenesis, tumor migration, invasion and metastasis. Tumorigenicity-related proteins play an important regulatory role during these processes. Research of tumorigenicity-related proteins is of great significance for identifing new targets for tumor treatment and blocking tumor occurrence and development. We reviewed the effects of tumorigenicity-related proteins on cell tumorigenesis, the consequence of protein interactions on tumor migration and invasion, the effects of tumorigenicity-related proteins on cell migration and invasion in vitro, and their relationship with tumor metastasis. This review provides rich information on the regulatory mechanism of tumorigenicity-related proteins in tumor development.

BACKGROUND The zircon U-Pb dating and analysis of major, trace and rare earth elements of rocks are the main research methods used to study the genesis of intrusive rocks. OBJECTIVES To constrain the genesis of neoproterozoic gneissic moyite of the Yangsanzhai, Xiaotian volcanic basin. METHODS Chemical composition of rocks was analyzed by X-ray fluorescence spectrometry (XRF), inductively coupled plasma-mass spectrometry (ICP-MS), and the zircon U-Pb age was determined by laser ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS). RESULTS Results show that the rock was characterized by high silicon, kalium and sodium, and low iron, magnesium, calcium and phosphorus. The content of SiO2, Al2O3, MgO, K2O and Na2O were 65.86%-78.29%, 10.89%-16.02%, 0.17%-1.17%, 1.37%-6.44% and 0.53%-6.50%, respectively. The rock belonged to the high potassic calc-alkaline series. The samples were characterized by depletion of Nb, Sr, P and Ti, and enrichment of La, Ce, Nd and Zr. The samples had high content of rare earth elements (ΣREE=152.70-650.88μg/g) with light rare earth enrichment (LREE/HREE=6.77-20.64). Most of the samples had weakly negative europium anomalies (δEu=0.29-1.15) without cerium anomaly. The normalized curve of rare earth elements was characterized by right-incline. The 206Pb/238U ages of the 30 zircon points ranged from 720 to 828Ma, with a weighted average age of 776±11Ma (MSWD=2.1). CONCLUSIONS The discovery of Neoproterozoic gneissic moyite in the Xiaotian Basin indicates that there is uplift in the center of this basin, not the 'bucket' shape of thick in the middle and thin at the sides, as previously recognized. This has important guiding significance for the understanding of the tectonic morphology of the basin and further prospecting.

FeCrMnNiCo, FeCrMnNiCo0.5 and FeCrMnNi alloys were prepared by vacuum melting and casting technology after metal powders was mixed by planetary ball mill. The effects of heat treatment temperature on the microstructures, tensile properties and hardness of three kinds of multi-principal alloys were studied by means of metallographic microscope, scanning electron microscopy (SEM), hardness tester and universal tensile testing machine. The results show that the hardness of FeCrMnNi alloy after heat treatment at 900 ℃ is the highest and the maximum hardness is 380HV. The plasticity of FeCrMnNiCo0.5 alloy is the largest after heat treatment at 700 ℃, and its elongation after fracture is 54.7%. At the same heat treatment temperature, with the increase of Co content, the alloys’ structure is changed from dendritic to honeycomb, and the alloys’ tensile strength is decreased. The hardness of the same alloy is increased with the increase of heat treatment temperature, which may be related to the increase of precipitates after heat treatment, but its tensile strength remains unchanged.

A series of YIG/BST ferromagnetic/ferroelectric composites were prepared by solid-state reaction using yttrium iron garnet (Y3Fe5O12) and barium titanate (Ba0.5Sr0.5TiO3). The phase and microstructure of the composites were investigated by XRD and SEM, and the dielectric and magnetic property were studied in detail. The results show that the ferroelectric phase and ferromagnetic phase exist independently when the composite is sintered at a certain temperature; (1-x)YIG-xBST (x=0.1, 0.2, 0.3, 0.4, 0.5) composites possess great dielectric properties: at room temperature, with increasing frequency (102-106Hz), the dielectric constant of each component composite and the dielectric loss decreases gradually; when the frequency is 1 MHz, the dielectric constant of the composite increases with the increase of BST content, and the dielectric loss first drops and then stabilizes; with the increase of temperature (0-400 ℃), the dielectric constant and dielectric loss of each composite at different frequencies gradually increase. The composites exhibit the hysteresis loop shape of a typical soft magnet. As the BST content increases, the saturation magnetization (Ms) gradually decreases, and the magnetic permeability decreases. The microwave property of the composite based metamaterial structure was studied. The results show that it can realize magnetic tunability.

Objective To evaluate the effect of curcumin on wound healing in deep tissue pressure injury(DTPI) induced by ischemia-reperfusion in mice. Methods Mice were randomly divided into control group (Con), model group (Mod), 4 and 8 mg/kg curcumin treatment group (Cur 4, Cur 8), 10 mice in each group. A deep tissue pressure injury model was established by magnet compression. The wounds tissue was injected with curcumin every 48 hours and photographed to observe the wound healing. HE staining was used to observe the pathological changes of wound healing. Real-time PCR was used to detect the mRNA expression of TNF-α, IL-6, IL-10, VEGF-α and TGF-β. Western blot was used to detect the expression of VEGF-α, TGF-β, Stat3 and p-Stat3. Results Compared with the control group, the wound in the model group gradually deteriorated, and the pathological changes were obvious. Compared with the model group, the wound healing of the Cur 8 group was significantly accelerated (P＜0.05). Compared with the model group, the inflammatory cell infiltration was reduced and the neovascular density was increased in the Cur 8 group. The mRNA expression of TNF-α and IL-6 in the wound tissues of the Cur 8 group was less than those in the model group, while the expression of IL-10, VEGF-α and TGF-β was higher than those in the model group (P＜0.05). The expression of VEGF-α, TGF-β and p-Stat3 in Cur 8 group was higher than those in model group (P＜0.05). Conclusions Curcumin administration can alleviate DTPI of mice induced by ischemia-reperfusion, and its mechanism may be related to the inhibition of inflammatory response and promotion of angiogenesis.

This article discussed how to train standardized pediatric residents during the COVID-19 pandemic, which included the knowledge and capacity building for infection prevention and control, standardized residents training and psychological intervention and so on. It ought to be useful to improve the professional competence of pediatric residents.

The purpose of this experiment was to investigate the effects of Lactobacillus plantarum (LP), cellulase (CE) and their mixture on the quality of alfalfa silage. In the experiment, LP and CE dosage were set at four levels, which were 0, 3, 5, 7 mg/kg for LP and 0, 25, 50, 75 mg/kg for CE, respectively. There were 16 treatments in total, and each treatment had three replicates. After 60 days of silage, the nutritional quality and fermentation index of alfalfa silage were measured, and the nutritional quality and fermentation index of alfalfa silage were comprehensively evaluated by membership function method. The results showed that the soluble carbohydrate (WSC) content of CE75 treatment was significantly higher than that of CE0 treatment (P<0.05). The content of acid detergent fiber (ADF) and neutral detergent fiber (NDF) in alfalfa silage decreased with the increase of CE addition at different levels of LP addition (P<0.05). Under different levels of CE, the pH value of LP5 treatment was significantly lower than that of LP0 and LP7 treatment (P<0.05). The results of membership function value showed that the highest membership function value of LP5 + CE75 treatment group was 0.729. The study indicates that adding LP and CE to alfalfa silage has positive effects on fermentation quality and nutritional components, and adding 5 mg/kg LP and 75 mg/kg CE to alfalfa silage has the best effect. [ABSTRACT FROM AUTHOR]

Objective To explore the biomarkers and potential mechanisms of chronic restraint stress- induced myocardial injury in hyperlipidemia ApoE-/- mice. Methods The hyperlipidemia combined with the chronic stress model was established by restraining the ApoE-/- mice. Proteomics and bioinformatics techniques were used to describe the characteristic molecular changes and related regulatory mechanisms of chronic stress-induced myocardial injury in hyperlipidemia mice and to explore potential diagnostic biomarkers. Results Proteomic analysis showed that there were 43 significantly up-regulated and 58 significantly down-regulated differentially expressed proteins in hyperlipidemia combined with the restraint stress group compared with the hyperlipidemia group. Among them, GBP2, TAOK3, TFR1 and UCP1 were biomarkers with great diagnostic potential. KEGG pathway enrichment analysis indicated that ferroptosis was a significant pathway that accelerated the myocardial injury in hyperlipidemia combined with restraint stress-induced model. The mmu&lowbar;circ&lowbar;0001567/miR-7a/Tfr-1 and mmu&lowbar;circ&lowbar;0001042/miR-7a/Tfr-1 might be important circRNA-miRNA-mRNA regulatory networks related to ferroptosis in this model. Conclusion Chronic restraint stress may aggravate myocardial injury in hyperlipidemia mice via ferroptosis. Four potential biomarkers are selected for myocardial injury diagnosis, providing a new direction for sudden cardiac death (SCD) caused by hyperlipidemia combined with the restraint stress. [ABSTRACT FROM AUTHOR]

The surface conditions of the two different T800 carbon fibers by the wetting (T800HB) and the dry jet-wetting spinning processes (T800SC) were characterized and analyzed by scanning electron microscope (SEM), atomic force microscope (AFM), X-ray photoelectron spectroscope (XPS) and contacting-angle measuring instrument. The mechanical properties of their multifilaments, NOL rings and unidirectional laminates were evaluated by universal material testing machine. Results show that the surface of T800HB by wetting process is rougher, while the surface of T800SC by dry jet-wetting process is more chemical-active. Both chemical interaction and mechanical engagement between fiber and resin matrix result in the similar interlaminar shear strength (ILSS) of T800HB and T800SC. However, when the composite is damaged, the interfacial bonding of T800HB/resin seems tighter dominated by the mechanical engagement, leading to brittle fracture feature of T800HB reinforced composite, while T800SC reinforced composite exhibits ductile fracture feature with weaker interfacial bonding. In addition, the tensile strength of filament of T800SC is higher than that of T800HB. Accordingly, the tensile strength of NOL ring and unidirectional laminate composite of T800SC are higher than those of T800HB. Therefore, in combination of mechanical properties of carbon fibers by two kinds of spinning processes and their reinforced composites, as well as their fracture features, compared with T800HB, T800SC is more suitable to be the reinforcement of the composite fabricated by filament winding process.

With the rapid development of the global economy, problems in energy production and environmental protection are becoming severe. To reduce fuel consumption and CO2 emissions, it is essential to reduce the weight of automobiles and other huge construction structures. Recently, a number of studies have been conducted on the use of low-density steels for automobile applications by incorporating aluminum in steel. The light elements can increase the lattice constant of steel while reducing the density of steel to achieve a lower atomic weight. Aluminum as a light element replaces the iron atoms in the unit cell, increasing the volume while reducing the weight, thereby reducing the density of steels. In this regard, ferritic Fe-8%Al steels indicated a 10% reduction in density compared with the conventional steels. To clarify the solid solution and precipitation behavior of Nb in Al-bearing ferritic steels, heat treatment tests were carried out under a series of temperature. The precipitates of NbC and the dissolved Nb solute in ferrite matrix with high Al content were studied using electrolytic dissolution technique, X-ray diffraction technique, and inductively coupled plasma-atomic emission spectrometry (ICP-AES). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were also applied. The experimental results show that the precipitates are NbC and also some Al2O3 and AlN inclusions. It is also found that with increase in the solution temperatures, the NbC in the as-cast samples becomes fewer and the coarsening behavior occurs. Moreover, when the temperature was over 1100℃, almost all the precipitates were dissolved. Furthermore, using Thermo-Calc software, the thermodynamic properties of Nb and relevant compounds were studied, and the interaction coefficient between Al an Nb was calculated. The results indicate that Al decreases the activity of Nb, and the solubility of NbC increases. Finally, the solid solubility formula of NbC was deduced, which can provide a basis for further application of ferritic steels with a high Al content.

BACKGROUND The analysis and testing process of high-phosphorus iron ore requires quality control of standard materials with similar matrix components, moderate content and fixed value components. At present, there are no certified reference materials available for high-phosphorus iron ore chemical composition analysis in China. The available iron ore reference materials in China and abroad have different matrix compositions and phosphorus contents. Phosphorus content is mostly less than 0.25%, while phosphorus content in high-phosphorus iron ore is higher than 0.25%. It is difficult to meet the analytical quality control requirements of high-phosphorus iron ore products with these reference materials. OBJECTIVES To develop three high-phosphorus iron ore reference materials with contents of iron and phosphorus forming a certain gradient and covering the content range of high phosphorus iron ore. CANDIDATES CHARACTERISTICS The sample GPFe-1 is composed of 40% metallic minerals, 25% quartz, 15% colloidal phosphate, 20% oolitic chlorite, clay mineral, apatite, carbonate minerals, rock debris and a small amount of organic matter. The metal minerals are hematite, limonite and pyrite.The contents of iron and phosphorus are 31%-37% and 0.1%-0.5%, respectively. The sample GPFe-2 consists of 40% hematite, 5% limonite, 55% gangue mineral, and minor collophanite and pyrite. The iron and phosphorus contents in GPFe-2 are 38%-44% and 0.6%-1.0%, respectively. The sample GPFe-3 is composed of 70% metallic minerals (hematite, limonite, pyrite), 5% quartz, 1% collophane, 3% chlorite, 1% cuttings, and minor apatite and calcite. The contents of iron and phosphorus in this sample are 48%-55% and 1.4%-2.0%, respectively. METHODS The samples of high-phosphorus iron ores were collected from the western Hubei Yelangping mining area in Zigui county of Yichang city, the Enshi Changling mining area (Wuhan iron and steel corporation mining area), and the Huoshaoping mining area in Changyang county of Yichang city (Bao Steel Group Changyang mining area). Uniformity and stability were tested for 25 components of SiO2, Al2O3, TiO2, P, K2O, Na2O, Fe, MnO, CaO, MgO, FeO, LOI, S, Cu, Pb, Zn, Cr, Ni, Co, Cd, Sr, Ba, V, As and Hg. Uniformity test was evaluated by variance analysis F test and relative standard deviation of test results. Stability test was evaluated by linear fitting and t-test. RESULTS Three samples were homogeneous and stable. The RSD of major elements and trace elements of 3 samples was less than 5%. The F value of variance test was less than the critical value F0.05(24, 25)=1.96, indicating that all the components of 3 samples were homogeneous. The stability test showed that the components of 3 samples had no directional change and statistically significant differences, indicating that the elements in the 3 samples were stable. The verified value was tested by 11 laboratories and by two or more different principles. The verified value components included 25 major elements and trace elements. Three components of Na2O, S and Hg of GPFe-1 had reference values, whereas other 22 components had certified values and uncertainties. The contents of iron and phosphorus in GPFe-1 were 35.18%±0.20% and 0.285%±0.010%, respectively. Two components of Cd and Hg in GPFe-2 had reference values, and other 23 components had certified values and uncertainties. The contents of iron and phosphorus in GPFe-2 were 41.46%±0.20% and 0.735%±0.020%, respectively. Two components of FeO and Hg in GPFe-3 had reference values, while other 23 components had certified values and uncertainties. The contents of iron and phosphorus in GPFe-3 were 51.44%±0.13% and 1.73%±0.05%, respectively. CONCLUSIONS The developed high-phosphorus iron ore reference materials meet the requirements for exploration, evaluation, and comprehensive utilization of high-phosphorus iron ore.

TC4 alloy samples were built by selective laser melting (SLM). The microstructure was observed, and electrochemical measurements were performed to investigate the corrosion resistance of SLMed TC4 alloy in different forming surface and roughness. The traditional rolled sample was introduced as a reference. Results show that processing method, forming surface and roughness act a significant role in influencing the corrosion resistance. The microstructure of SLMed TC4 on vertical section consists of the primitive columnar β grains filled with a large number of acicular α' martensites oriented at approximately ±45° with building direction. Unlike the typical α+β phase of traditional rolled sample, a chessboard pattern is observed on cross-section of SLMed TC4. The electrochemical results suggest that the corrosion resistance of traditional rolled sample is superior to that of SLMed sample. SLMed TC4 sample exhibits a better corrosion resistance on the vertical section, compared with the cross-section. Besides, the SLMed sample with rougher surface exhibits poorer corrosion resistance. Obvious etch pit is found on the surface of SLMed sample and the corrosion morphology is pitting.

The experiment aimed to explore the potential application of the functional indigenous grass Carotae fructus in livestock production, investigate the influence of inclusion ratios of Carotae fructus on the in vitro digestive characteristics of pasture. A single-factor completely randomized design was employed, with Carotae fructus added at proportions of 0, 4%, 8%, and 12% to four types of aboveground mixed pasture: Elymus sibiricus, Agropyron cristatum, Elymus nutans, and Medicago sativa. The results showed that after 72 h of fermentation, compared to the group without Carotae fructus, the addition of 4% Carotae fructus increased the IVDMD of Elymus sibiricus by 19.92% (P<0.05). Compared to the group without Carotae fructus, the addition of 8% Carotae fructus increased the IVDMD of Agropyron cristatum, Elymus nutans, and Medicago sativa by 16.76%, 16.35%, and 1.83%, respectively (P<0.05). The study indicates that Carotae fructus, as a functional indigenous grass, can be used as a roughage for ruminants, improving the digestibility when added at a dosage of 4% to 8%. [ABSTRACT FROM AUTHOR]

To study deeply the influence of the frame ring plate increased between rectifier wheel and rotor on the size of eddy current of fluid field of brushless exciter，the fluid field of complete brushless exciter model is established. Based on the computational fluid dynamics ( CFD) principles ，the finite volume method is adopted to simulate and analyze the three dimensional turbulent flow field in the computational domain. The distribution character of the fluid field for the brushless exciter is obtained under rated speed，after increasing the frame ring plate between rectifier wheel and rotor. The results show increased the frame ring plate between rectifier wheel and rotor can decrease effectively the size of eddy current in the air region between rectifier wheel and rotor. Compared with the result of running scheme，the air volume flow rate of the scheme has increased 13. 89% and the result is accuracy. It provides theoretical basis for further optimizing the air ducts structure of the brushless exciter .

The welding performance of steel structures such as offshore platforms, ships, bridges, buildings, and oil and gas pipelines directly determines the service life and safety of the structure, the importance of which cannot be minimized. In welding-related research, the toughness of the welding heat-affected zone is a key issue. This zone experiences temperatures as high as 1400℃, thereby causing the formation of coarse austenite grains. If the welding parameters are improperly controlled, microstructure refinement cannot be achieved by subsequent phase transformation, which results in decreased impact toughness. Multi-pass welding is even more complex, with the secondary heat input affecting the coarse-grain zone formed during the previous pass. This results in the formation of necklace-type M-A constituents, which also lead to deterioration in toughness. In this paper, the relevant research results were summarized with regarding the welding heat-affected zone and it was discuss that the composition of the parent material, the second phase, the welding process, and other factors effect the microstructures and properties of the heat-affected zone. This paper also offers ideas for improving the welding performance of large steel structures in low-temperature service circumstances.

Ti-Al alloyed coatings with different Nb doping contents were fabricated on TC4 titanium alloy by laser surface alloying to improve high temperature oxidation resistance of the alloy. Structures and high temperature oxidation behaviors of the alloyed coatings were analyzed and tested by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and box-type resistance furnace. The results show that the alloyed coatings consist of TiAl and Ti3Al, and no niobium compound are formed in Ti-Al-Nb alloyed coatings. The alloyed coatings are uniform and exhibit excellent metallurgical bonding with the substrates. A large amount of surface cracks and a few penetrating cracks are formed in Ti-Al alloyed coating without Nb doping, while no obvious cracks are formed in Ti-Al alloyed coating with Nb doping. The oxidation mass gains of all the alloyed coatings were significantly lower than those of the substrate. The alloyed coatings with Nb doping exhibit more excellent high temperature oxidation resistance due to the beneficial machanism of Nb doping. The mechanism of Nb doping on improving high temperature oxidation resistance of Ti-Al alloyed coatings includes reducing the defect concentration of TiO2, refining oxide grains and promoting the formation of Al2O3.

Using ammonia terminated polydimethylsiloxane - methoxy polyethylene glycol acrylate - and vinyl acetate as raw materials - sufficient CO2 friendly groups are introduced to increase the solubility of the thickener in CO2. A CO2 thickener with easy solubility - environmental protection - low cost and good thick¬ening effect is developed - achieving CO2 viscosity increase under solvent-free conditions. The synthesis process conditions of supercritical CO2 tackifier were optimized using response surface methodology. The results showed that the optimal synthesis conditions were as follows: the addition of ammonia terminated polydimethylsiloxane was 50 g - the addition of methoxy polyethylene glycol acrylate was 27 g - the addition of vinyl acetate was 41 g-the reaction temperature was 75 °C - and the reaction time was 8 h. At a tempera¬ture of 35 °C and a pressure of 8 MPa-the CO2 liquid viscosity of the 2 supercritical CO2 tackifier in¬creased by 50.46 -53. 17 times-which is close to the predicted value of 52.085 times by the model. [ABSTRACT FROM AUTHOR]

To explore phosphorus (P) rate effect on protein and metal content of flaxseed, and to provide a basis for establishment high efficient P fertilizer management, field experiments were conducted in 2018 and 2019 with 2 factors randomized block by 5 P levels (0, 40, 80, 120, 160 kg P2O5 · hm-2) for 3 cultivars (Longyaza 1, Longya 14 and Zhangya 2). Seed protein, potassium, calcium, sodium and magnesium contents of flaxseed were investigated. Results showed that flaxseed yield, seed potassium, calcium and magnesium contents improved in different degrees with P application rate. Compared with no P, average seed yield, seed potassium, calcium and magnesium contents increased 17.6%, 11.6%, 17.6% and 12.5% respectively. Phosphorus did not affect seed sodium and protein contents. Considering yield, seed potassium, calcium and magnesium contents between years, P rate of 80 kg P2O5 · hm-2 was the most appropriate, which synergistically increased yield, flaxseed calcium and magnesium contents, and also reduced environmental risks by excess P fertilizer. [ABSTRACT FROM AUTHOR]

Positron emission tomography (PET) is the most advanced molecular imaging technology with the advantage of high sensitivity and quantity analysis. Molecule probe is the key factor for PET. 89Zr is a novel imaging nuclide and suitable for labeling macromolecular bioactive substances such as antibody due to its favorably long half-life and energy. This review outlined the recent development of the production of 89Zr, labeling methods and application of 89Zr labelled radiopharmaceuticals.

The effect of heat treatment on the high temperature ductility of 00Cr24Ni13 austenitic stainless steel casting billets was investigated by heat treatment experiment, therma-compression test and thermal tensile test. The result showed that δ ferrite morphology in the casting billet could be significantly changed through the heat treatment process. After air cooling from 1200℃ for 3 h, large area of continuous reticular δ ferrite in the casting billet completely changed into dispersed granular phases. Compared with the casting billet before heat treatment, heat-treated samples which are composed of granular δ ferrite had a higher value of deformation resistance at different compression temperatures, but there was no sharp deterioration in deformation resistance, the thermal simulation tensile strength remained almost the same and the reduction of area (Z) at the same temperature increased obviously. The temperature region of Z ≥ 60% extended from 1150-1280℃ to 1050-1300%, and the high plasticity (Z ≥ 80%) range is about 150% (1150-1300℃).

The paper built load model of ball mill based on power spectrum analysis, and analyzed relations among ball mill load, sound intensity of mill noise and spectrum distribution of mill noise, that is sound pressure of detection point of mill noise is proportional to square of vibration speed of ball mill shell, noise frequency is proportional to vibration frequency of ball mill shell, mill noise signal become weaken gradually with increasing of ball mill load. Spectrum of mill noise mainly distributes under 1 500 Hz. Distribution of spectrum of mill noise is more uniform when the ball mill runs normally, and spectrum of mill noise mainly distributes 0~1 000 Hz when the ball mill runs in undergrinding. Matlab simulation result validates feasibility and effectiveness of the load model of ball mill.

For problems of complex wiring and high cost of wired data transmission mode of traditional temperature detection system, a wireless temperature detection system was designed based on AT89S51 microcontroller, digital temperature sensor DS18B20 and radio frequency transceiver chip nRF905. The system uses DS18B20 for site temperature measurement, completes wireless data transmission by nRF905, and uses AT89S51 for data processing as well as communication with the computer, which achieves multipoint temperature acquisition and long-distance wireless transmission.

The study was to use a memory-free hydride generation atomic fluorometer to determine mercury content in feed. The joint developed atomic fluorescence spectrometer breaks through the problem of serious memory effect in determination of trace mercury by spectrometry, and established a method for determination of mercury in feed by atomic fluorescence spectrometry with water as carrier current without memory effect hydride. HNO3-H2O2 (1:1) was selected from the four mixed acids as the digestion system, and 2 mL 220 g/L sulfamic acid solution was selected to eliminate interference of nitrogen oxides. The established method had good linearity in concentration range of 0.2~1.0 µg/L, the correlation coefficient r=0.999 6, the detection limit (n=11) was 0.003 1 µg/L, the relative standard deviation (n=7) was 2.28%, and the recovery rate was between 93%~99%. The study indicates that the method has the advantages of high sensitivity, accuracy and efficiency, which can realize the rapid detection of mercury content in feed. [ABSTRACT FROM AUTHOR]

CYP79 is a key enzyme in the synthesis of cyanogenic glycoside. However, there is no systematical study of CYP79 genes in flax. In this study, we identified CYP79 gene family in 9 crops including flax, and focused on the sequence characteristics, duplication events, collinearity, evolution, cis-acting elements and expression patterns of LuCYP79 genes. The results revealed that a total of 9, 9, 3, 2, 5, 7, 6, 16, and 4 CYP79 family members were identified in flax, pale flax, poplar, cassava, sesame, sorghum, soybean, grape, and rice, respectively. Phylogenetic analysis showed that the evolution of CYP79 genes was species-specific. LuCYP79 were distributed unevenly on four chromosomes and had 1-3 exons. The promoter region of LuCYP79 contained lots of elements involved in response to hormone and stress. 8 full-length DNA sequences and 5 full-length cDNA sequences of flax LuCYP79 genes were cloned. LuCYP79 proteins contained 282-565 amino acid residues with molecular weight of 31.56-62.86 kD, and isoelectric point of 5.84-9.14. All LuCYP79 members were hydrophilic protein and located in endoplasmic reticulum. There were five pairs of LuCYP79 genes with duplication events, accounting for 77.8% of all genes, and all the duplication genes underwent strong purification selection. Both LuCYP79-1 and LuCYP79-9 had homologous genes in Arabidopsis and cassava. The relative expression levels showed that LuCYP79 family members were tissue-specific and had different expression patterns under different genetic backgrounds. There were significantly different in the relative expression of LuCYP79-1, Lu-CYP79-7, LuCYP79-8, and LuCYP79-9 in the four cultivars. Moreover, correlation analysis showed that LuCYP79-1/LuCYP79-7 in 50 days flaxseed was significantly positively correlated with the concentration of cyanogenic glycosides in mature flaxseed. LuCYP79-7/LuCYP79-8 and (LuCYP79-7+LuCYP79-9)/LuCYP79-8 in 20 days flaxseed were significantly positively correlated with the concentration of cyanogenic glycosides in mature flaxseed, respectively. It was preliminarily speculated that they might be the key genes in the synthesis of cyanogenic glycoside in flaxseed. These results have positive significance for further elucidating the function of CYP79 proteins in flax and provide theoretical references for breeding flax varieties with low cyanogenic glycoside. [ABSTRACT FROM AUTHOR]

The experiment was to investigate the effect of alfalfa meal replaced by silage with equal dry matter on growth performance, nutrient apparent digestibility and antioxidant performance of meat rabbits. A total of 100 rabbits with similar body weight and age of (30±2) days were randomly divided into five groups: Control group (no silage alfalfa), group A (8% silage alfalfa), group B (12% silage alfalfa), group C (16% silage alfalfa) and group D (20% silage alfalfa), with 20 replicates in each group and one rabbit in each replicate. The pre-test period lasted for 5 d and the formal test period lasted for 35 d. The results showed that compared with control group, the average daily gain, final weight and apparent digestibility of crude fat, acid detergent fiber, crude protein and crude fiber of meat rabbits in group B were significantly increased (P<0.05), and feed to gain ratio was significantly decreased (P<0.05). The content of MDA in serum and muscle of meat rabbits in group B was significantly decreased (P<0.05), while SOD, GSH-Px and T-AOC were significantly increased (P<0.05). The experiment indicates that using a certain proportion of equal dry matter alfalfa silage instead of alfalfa meal can improve the growth performance, nutrient apparent digestibility, antioxidant capacity of serum and muscle of meat rabbits, and the replacement proportion of 12% is better. [ABSTRACT FROM AUTHOR]

The experiment was conducted to study the silage mulberry on growth performance, slaughter performance, amino acid and fatty acid content of longissimus dorsi muscle of Hu sheep. A total of 24 healthy male Hu sheep with similar birth date, parity and weight were randomly divided into two groups, with three replicates in each group and four sheep in each replicate. The sheep in control group were fed with 50% peanut vine + 50% concentrate diet, the sheep in F group were fed with 40% peanut vine + 10% silage mulberry + 50% concentrate diet. The feeding trial lasted for 60 d. The results showed that compared with control group, the average daily gain of sheep in F group was extremely increased (P<0.01), feed to gain ratio was extremely reduced (P<0.01), carcass weight, slaughter rate, net meat weight, meat percentage and eye muscle area were significantly or extremely increased (P<0.05 or P<0.01). Compared with control group, the pH45 min, pH24 h, a45 min and a24 h of meat in F group were significantly or extremely increased (P<0.05 or P<0.01). The content of total amino acids, fresh amino acids, sweet amino acids and essential amino acids in longissimus dorsi muscle in F group were extremely increased (P<0.01). The content of heptadecenoic acid, oleic acid, α-linolenic acid, monounsaturated fatty acid and unsaturated fatty acid in longissimus dorsi muscle of F group were significantly or extremely increased (P<0.05 or P<0.01). The total content of carmyoleic acid, pentacarbonate, palmitic acid, heptadacarbonate, stearic acid and saturated fatty acid were significantly or extremely decreased (P<0.05 or P<0.01). The experiment indicates that the addition of 10% silage mulberry can improve the growth performance, slaughter performance, optimize the composition of amino acid and fatty acid in muscle of Hu sheep and improve the nutritional value of muscle. [ABSTRACT FROM AUTHOR]

In order to study the effects of different storage temperatures and preservatives on the preservation effects of Qiuyang pear fruits, the effects of 0.5 μL/L 1 -methylcyclopropene (1 -MCP) fumigation for 12 h and ethylene adsorbent treatments on the storage qualities of Qiuyang pears were investigated under different storage temperatures (-1 °C and 0 °C). The results showed that after 120 days of storage, the decay rates of fruits stored at 0°C was lower than that stored at -1°C under the same treatment conditions. At 270 days, the decay rates of fruits stored at 0 °C and -1°C in the two preservatives treatment groups were lower than those in CK group. The fruits peels brightness of CK group and ethylene sorbent treatment group at 0°C was higher than that stored at -1 °C. After 240 days of storage, the fruits hardness of 1-MCP treatment group was remarkably higher than that of other treatments groups (P<0.05), and the fruits hardness of 1-MCP treatment group stored at 0°C was significantly higher than that stored at -1°C at 270 days (P<0.05). The titratable acid contents of fruits in the two preservatives treatment groups were higher than that in CK group at 270 days of storage. The soluble solids contents of fruits in each group presented no significant changes during storage. In conclusion, Qiuyang pears presented low decay rates and well maintained peels brightness when stored at 0°C. The two preservatives treatments could both reduce the decay rates and delay the decline of titratable acid contents of Qiuyang pears, and the 1-MCP treatment showed better effects that could effectively maintain peel brightness and fruit firmness. [ABSTRACT FROM AUTHOR]

The current preparation methods and research development trends of low dimensional nano structural materials are introduced, the working principle and technology development status of low dimensional nano structural materials are described, as well as the synthesis process of low dimensional nano structural materials is described, and the research progress of low dimensional nano structural materials synthesis technology is analyzed. The future research directions of low-dimensional nano-structured materials are prospected, and it is pointed out that the synthesis of new low-dimensional nano-structured materials with controllable size, structure and physical properties that will become one of the important research directions in the field of nanotechnology. [ABSTRACT FROM AUTHOR]

A logical worm propagation model contributes to the analysis of how exactly various worms spread in Internet.With the abstract of heterogeneous network environments,and considering the impact of infection time on worm propa-gation,a heterogeneous network oriented worm propagation model namely Enhanced-AAWP was derived using discrete time and deterministic approximation.Then,the worms which employed local preference scanning or random scanning were studied based on Enhanced-AAWP.As the simulation results show,the amount of NAT,the density of vulnerable hosts in NATs,and the probability of local preference scanning are influencing factors during the course of worm propa-gations in heterogeneous network environments.