Subjects: Physics >> Nuclear Physics submitted time 2024-02-20
Longxiang Liu
Kang Sun
Han Yi
Fei Lu
Hongwei Wang
Gongtao Fan
Xiguang Cao
Yue Zhang
Suyalatu Zhang
Dexin Wang
Xinxiang Li
Yuxuang Yang
Pan Kuang
Xinrong Hu
Zirui Hao
Sheng Jin
Kaijie Chen
Wei Jiang
Ruirui Fan
Qiang Li
Abstract： The angle-differential cross sections of neutron-induced d production from carbon were measured at neutron energies 33.9 MeV at China Spallation Neutron Source (CSNS) Back-n white neutron source. By employing the ΔE-E telescopes of the Light-charged Particle Detector Array (LPDA) system at 24.5° to 155.5° in the laboratory system, the angle-differential cross sections of the 12C(n,d)x reactions were measured.
The experimental results are in good agreement with the previous ones.The present work can provide a reference to the data library considering the lack of experimental data.
Subjects: Nuclear Science and Technology >> Nuclear Science and Technology submitted time 2024-01-04
Abstract： In proton and heavy ion radiotherapy, the relative stopping power of each voxel point obtained by CT scan for patient is the key to accurately calculate the dose distribution in the body using treatment planning system. In this study, a tissue equivalent phantom was scanned twice by setting different tube voltages for a conventional CT scanner. The relative electron density and effective atomic number of the phantom were calculated by the CT values derived from the two-set images, and then the relative stopping power of the phantom was calculated. The results showed that the relative stopping power of the tissue equivalent phantom acquired with the two-set CT values was better than that based on the conventional single set of CT images. Thus, the method established in this study might play an important role in further improving the dose calculation accuracy in the treatment planning of proton and heavy ion radiotherapy.
Subjects: Physics >> Nuclear Physics submitted time 2023-11-01
Abstract： Carbon ion radiotherapy is expected to become a workhorse for head and neck tumors radiotherapy due to its inverted depth dose distribution and high relative biological effectiveness, which has the advantages of less damage to normal tissues and low side effects. The accuracy of dose algorithms directly affects the accuracy of clinical irradiation doses, and reducing the dose calculation error of carbon ion radiotherapy could help improve patient’s survival and local control rates. In this paper, the dose distribution of carbon ion radiotherapy for 5 head and neck patients were calculated by the analytic pencil beam algorithm and validated using Monte Carlo method. Three analysis methods were carried out for the calculated and simulated results: (1) Gamma pass rate analysis under multiple evaluation criteria combination (2%/2mm, 3%/2mm, 3%/3mm, 3%/5mm), (2) DVH and reference index analysis, (3) central axis dose curve comparison. The analysis results showed that the average gamma pass rate of the pencil beam algorithm was 90.441% under the evaluation criteria of 3%/2mm, which met the dose calculation requirements of carbon ion radiotherapy for head and neck tumors. The pencil beam algorithm calculated more accurate in the beam transverse direction, and there is a range deviation by which the structure inhomogeneity and cavity exited in the irradiation path. In order to reduce the impact of dose calculation error, a more conservative angle selection to carbon-ion beam treatment of head and neck tumors is recommended. The results herein could be used to guide the design of carbon ion radiotherapy for head and neck tumors based on analytical pencil beam algorithm.
Peer Review Status:
Awaiting Review
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《材料研究学报》
Abstract： The effect of transition metal elements, such as Zr, Nb, Mo and Cu on the amorphous forming ability, thermal stability and magnetic propertywere investigated for the Fe78Si9B13 alloy.By varying the Fe content of the Fe74Cu1Si13B9Nb3amorphous alloy, two series alloys, i.e. Fe(76+x)Cu1Nb3Si(11-x)B9(x=0, 2, 4) and Fe(79 + x)Cu1Nb2Si(6- x)B12(x=0, 2, 4) amorphous- and nanocrystalline- alloyswere prepared and finally their ribbons were producedby melt- spinning.The microstructures and magnetic properties of the prepared ribbonswere investigated by XRD, DSC, TEM and VSM etc. and the soft magnetic properties ofthe high Fe content alloyswere optimized by increasing the content of Nb.The results showed that theelements of Zr and Nb can effectively improve the amorphous forming ability and thermal stability of Fe78Si9B13 alloys; A seriesFe-Cu-Nb-Si-B amorphous- and nanocrystalline- alloys with Fe content >80% (atomic fraction) were successfully prepared, themicrostructures of which are typically composed of dual amorphous- and nanocrystalline-phase. Their saturation magnetizations Bs are larger than 180emu/g and coercivitiesHcare between 2Oe and 9Oe, which means the alloys exhibit a good soft magnetic property. Thecoercivity would be reducedsince the grain size would be refined and thus the soft magnetic properties would be significantly improved as the Nbcontent increases. When the Fe content is between 80% (atomic fraction) and 83% (atomic fraction), the alloyswould exhibit an excellent soft magnetic property but when the Fe content comes to 85% (atomic fraction), phases of Fe2B and Fe3B would be precipitated that would furiouslydeterioratethe soft magnetic properties of the alloys.
Subjects: Psychology >> Social Psychology submitted time 2023-03-28 Cooperative journals: 《心理科学进展》
Abstract： Psychology of death remains a complex psychological state of cognition, emotion, and behavioral intention in the face of death and death-related events. Currently, the most comprehensive and scientific theory that investigates death psychology is the Terror Management Theory (TMT). However, TMT has the following controversies: (1) In terms of three basic cognitive aspects of death, the theory presents inconsistent research results on whether death is independent of uncertainty, whether death causes fear, and whether individual survival is a central issue for human beings; (2) On the socio-cultural level, the cultural background of the inventor of TMT generally denies death. However, cross-cultural studies demonstrate that other cultures treat death with attitudes such as acceptance and contempt; (3) Finally, there exist a lot of contradictions in the research results of TMT. This indicates that there are important regulatory factors that were not involved in the present study. On this basis, the possible research directions of death psychology can be summarized from the aspects of cognition, behavior, and society. Studies at the cognitive level have found that people often have a sense of uncertainty when facing death. Enhancing the sense of belonging can effectively alleviate death anxiety; meanwhile, gaining a greater sense of the significance of life can make accepting death easier. Behavioral level studies have revealed that death anxiety has the property of embodiment cognition. Perhaps researchers need to reevaluate studies on the psychology of death from an embodied cognition perspective. In addition, death-related rituals perform both practical and symbolic functions, and the study of these functions and underlying mechanisms can be carried out from two aspects: the bottom-up and the top-down. Investigations of the social level have discovered that the psychological content and process of death in different cultures can be abstracted into a series of core dimensions which can be used as a prototype to predict and intervene the reality. In the present society, people are less psychologically prepared to face death. Therefore, it is urgent to carry out scientific research on content and process of Chinese people's psychology of death. In the future, the death psychology research should regard science and culture with equal attention. On one hand, the basic research on the psychology of death can use more objective measures such as heart rate, electrodermal activity, cortisol, and brain imaging techniques. On the other hand, traditional but underappreciated methods should be used to supplement laboratory research, such as qualitative research, case study, longitudinal study, etc. Secondly, the study of death psychology should be combined with the cognitive construction of death ontology, as well as procedures and coping behaviors for death. Thirdly, death is an individual event, a social event, and, sometimes, a political event. Therefore, researchers need to pay attention to the psychological patterns of the group in the face of death in order to understand questions such as how to construct the psychological defense system of death in modern society and how the death narrative evolves. Lastly, death events tend to cause fear and anxiety among the exposed individuals or groups. In severe cases, mental disorders such as PTSD may occur along with chronic physical diseases, though the clinical mechanism of this process is unclear. Therefore, it is necessary to carry out research on mental and physical health intervention under the influence of the psychology of death to assist individuals to develop a healthy lifestyle.
Subjects: Psychology >> Social Psychology submitted time 2023-03-28 Cooperative journals: 《心理科学进展》
Abstract： Structural equation modeling (SEM) is an important statistical tool in psychology, management, and sociology. However, many studies that use SEM lack analyses and reports of statistical power. Studies with low statistical power may result in a waste of labor and material resources; studies may even be led astray because of failure to test real effects, thereby making incorrect conclusions. In addition, low statistical power may cause researchers to mistake poorly fitted models for well-fitted models. Consequently, researchers may draw incorrect conclusions. At present, the Satorra-Saris, MacCallum, and Monte Carlo methods are the three main types of statistical power analysis methods for SEM. The Satorra-Saris and MacCallum methods are based on various important conclusions on the χ2 distribution given by the earlier works of Satorra and Saris. These methods are applicable for analyzing the statistical power of χ2-based tests in SEM. The Monte Carlo method is based on the work of Muthén and Muthén, and it uses simulations to analyze the statistical power, which can be applied to a wide range of test situations in SEM. Among the three types of analytical methods, the MacCallum method is the simplest and least computationally intensive; however, it has the narrowest scope of application. The Monte Carlo method is the most complex and computationally intensive, and it has the widest scope of application. The Satorra-Saris method has moderate complexity, computation intensity, and scope of application. In practice, researchers can choose the appropriate analysis method according to the purpose of the test, test method, availability of alternative models, ease of use of the method, and computational power. The Satorra-Saris method is recommended when the test is based on the χ2 distribution (e.g., the χ2 test, likelihood ratio test, Wald test, and test of model fit index), the alternative model is clear, and the test object is simple; the MacCallum method is recommended if the alternative model is unknown. The Monte Carlo method is recommended when simulation or resampling methods are used, or when the target of the test is complex. In addition, when researchers try to evaluate the model fit for SEM, there is a conjugate relationship between the statistical power analysis and the equivalence test. Therefore, researchers have proposed a new method in recent years to evaluate the model fit of SEM, which can be conditionally interchanged to some extent.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-19 Cooperative journals: 《金属学报》
Abstract： Zr-4 coarse-grained specimens were corroded in static autoclave at 360 ℃, 18.6 MPa in 0.01 mol/L LiOH aqueous solution for 70 and 160 d exposure. EBSD, SEM and HRTEM were used to investigate the microstructures and crystal structures of oxide layers, and the relationships between the oxide thickness and the grain orientation of the metal matrix. The results showed that the oxide layers formed on the grain surfaces with the orientations nearby basal plane (0001) were thicker, and exhibited a prominent anisotropic for the oxide growth when Zr-4 specimens were corroded in LiOH aqueous solution for 160 d, but this was not the case for 70 d. The grains with the surface orientation nearby (0001), (1010) and (1120) were selected from the specimens corroded for 70 d to investigate the effect of metal grain orientation on the microstructure of oxide layers. The results showed that the crystal structure and microstructure of oxide layers formed on different metal grains were obviously different, and the scattering of m-ZrO2 columnar grain orientations in the oxide layers formed on near basal plane (0001) was wider than that on near prismatic plane (1010) and (1120). Besides the majority of m-ZrO2, c-ZrO2, t-ZrO2 and sub- oxide phase Zr3O were also detected at the oxide/metal interface, and it showed that the microstructure and crystal structure of oxide layers were very complex. The microstructural evolution of oxide layers will affect the diffusion of oxygen and subsequently the growth of oxide. Therefore, the microstructural evolution of oxide layers, which was affected by the different microstructure of oxide layers formed initially on grains and the water chemistry of corrosion tests, resulted in the anisotropic growth of oxide layers when Zr- 4 specimens were corroded in LiOH aqueous solution in subsequent corrosion tests.
Subjects: Biology >> Ecology submitted time 2022-10-21 Cooperative journals: 《干旱区地理》
Abstract：为了探索高寒草甸土壤理化性质对海拔和坡向的响应及其与植被的关系，以东祁连山高寒 草甸为研究对象，分析了7个海拔和2个坡向高寒草甸的土壤养分含量和生态化学计量比变化规 律及其与植被的关系。结果表明：（1）土壤含水量、电导率、有机碳、全氮、全钾、碱解氮、速效磷、速 效钾含量、碳磷比（C/P）和氮磷比（N/P）随海拔的升高呈先升高后降低的趋势，土壤容重、全磷和碳 氮比（C/N）呈先降低后升高的趋势。（2）同一海拔，大部分海拔梯度阳坡的土壤土壤容重、速效钾、 电导率和全磷高于阴坡，阳坡的土壤含水量、速效磷、C/P和N/P低于阴坡，海拔3200 m梯度以下阳 坡的土壤有机碳、全氮、碱解氮和C/N低于阴坡。（3）不同海拔和坡向的高寒草甸土壤C/N、C/P和N/P 处于14.55~38.13、12.61~87.94和0.27~5.01之间。（4）冗余分析（RDA）发现，土壤容重、全氮和速效 磷是影响高寒草甸植被的关键土壤因子，聚类分析发现海拔3200~3400 m的阴坡和阳坡聚为一 类。综上所述，东祁连山高寒草甸土壤养分和生态化学计量比随海拔和坡向的变化呈规律性变 化，基于对N/P比的分析发现，该区域高寒草甸类草原的初级生产力主要受土壤氮限制且低海拔和 高海拔区域尤为明显，基于聚类分析发现，海拔3000 m和3400 m是该区域草地植被和土壤特征发 生变化的临界线。建议在高寒草甸类草原的管理过程中，应该充分考虑海拔和坡向的分异性特征。
Subjects: Psychology >> Statistics in Psychology submitted time 2022-03-14
Abstract：
Structural equation modeling (SEM) is an important statistical tool in psychology, management, and sociology. However, the lack of analyses and reports of statistical power in many studies using SEM has reduced the probative power of the study results. There are three main types of statistical power analysis methods for SEM: the Satorra–Saris, MacCallum, and Monte Carlo methods. The Satorra–Saris method applies to cases where the alternative model is clear, analysis object is simple, and the statistic to be examined is based on the χ2 distribution. The MacCallum method is applicable to the case of χ2-based overall model fit tests with unknown alternative models. Further, the Monte Carlo method applies to cases where the analysis object is complex, or the test is performed using simulation or resampling methods. In practice, researchers should clarify the purposes and methods of the test as well as the availability of alternative models as a priority. The research method can then be determined on the basis of the above information.
Peer Review Status:Awaiting Review
Subjects: Psychology >> Clinical and Counseling Psychology submitted time 2020-11-09
Abstract： Abstract: Psychology of death remains a complex psychological state of cognition, emotion and behavioral intention in the face of death and death-related events. Currently, the most comprehensive and scientific death psychology research is the Terror Management Theory (TMT). However, TMT has the following controversies: (1) In terms of three basic cognitive aspects of death, the theory presents inconsistent research results on whether death is independent of uncertainty, whether death causes fear, and whether individual survival is a central issue for human beings; (2) On the socio-cultural level, the cultural background of the Terror Management Theory was that there was a general denial of death. However, cross-cultural studies demonstrate that other cultures treat death with attitudes such as acceptance and contempt; (3) Finally, there exist a lot of contradictions in the research results of fear management theory. This indicates that there are important regulatory factors which are not involved in the present study. On this basis, the possible research directions of death psychology can be summarized from the aspects of cognition, behavior, and society. In the future, the death psychology can consider the research attitude that attaches equal importance to science and culture, combine the content and process of death psychology, pay attention to the psychological laws of the group in the face of death as well as carry out the intervention research of physical and mental health under the influence of death psychology.
Peer Review Status:Awaiting Review
Subjects: Computer Science >> Computer Application Technology submitted time 2020-02-15
Abstract： [Objective] To explore the application scenarios and progress of artificial intelligence in the diagnosis, treatment and control of 2019 novel coronavirus (2019-ncov), and to provide reference for the prevention and control of new coronavirus pneumonia with artificial intelligence. [Methods] Combing with the technical characteristics and advantages of artificial intelligence, current application progress and opportunities of artificial intelligence gene sequencing, auxiliary diagnosis, remote expert system, drug screening and development, and resource allocation were analyzed. [Results] China is the hardest-hit country of the new coronavirus. It has accumulated a lot of experience in the prevention and control of the epidemic, but there are still many technical shortcomings to be assisted by science and technology. While, it is still in the preliminary stage with lack of proven achievements. There is much repeated development in auxiliary diagnosis. [Limitations] Most of the data currently in use comes from reporting, and progress analysis would be more comprehensive with more academic results. [Conclusions] It needs comprehensive research and development in all aspects based on the sharing and opening in data, algorithms, and computing capacity to help promoting control of 2019 novel coronavirus pneumonia. More investment and regulation are needed."
Peer Review Status:Awaiting Review
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2019-05-10 Cooperative journals: 《计算机应用研究》
Abstract： Aiming at the properties of direction and diversity of social relationships in the social networks, this paper proposed a clustering algorithm of social networks based on graph clustering and ant colony optimization algorithm. Firstly, it constructed a directed and non fully connected complete graph for the social networks under constraint condition of network coverage; then, it adopted K-medoids algorithm to search the center users of all user groups, and it adopted ant colony optimization to search the similarities of each user and center users in the graph, it grouped the users satisfied the threshold condition into the same group. This paper also designed a prediction mechanism of low active degree users to resolve the sparsity problem and cold-start problem, besides, the network coverage constraint condition was set to balance the indexes of accuracy and coverage. Simulation experimental results indicate that the proposed algorithm realizes a good clustering performance of social networks, and it reduces the problems of sparsity and cold-start effectively.
Subjects: Dynamic and Electric Engineering >> Electrical Engineering submitted time 2019-03-05 Cooperative journals: 《电气工程学报》
Abstract：发展规模化储能是满足日益增长的电力需求、电网削峰填谷以及增加可再 生能源并网消纳的重要途径，储能技术在电网中的应用将大幅提高电网运行的安全性、 可靠性、经济性和灵活性。本文首先介绍几种适合规模化发展的储能技术类型，对比 分析了这些储能技术的优缺点，指出了影响规模化储能应用的因素。通过分析规模化 储能五种最具潜力的电网应用模式：调频、新能源消纳、延缓电网投资建设、负荷跟 踪平滑和削峰填谷，给出了储能应用所需的技术和经济指标要求。最后展望了规模化 储能发展应用需要解决的问题和挑战，为储能技术研究和产业发展提供了参考。
Subjects: Geosciences >> Geography submitted time 2019-01-11 Cooperative journals: 《干旱区地理》
Abstract： 掌握NMC和本地客观产品的气温预报能力，对提高宁夏城镇天气预报质量和全国排名有重要的意义。基于2009年1月～2014年12月T639和ECMWF两种模式产品及宁夏20个国家级观测站气温资料，采用资料按月和季划分的2种MOS方法，预报未来168 h最高、最低气温，运用宁夏现行的检验评估方法对2015年1月到2016年6月的预报效果进行检验，并与预报员（YBY）和中央气象台指导产品（NMC）对比，结果表明：MOS方法预报宁夏气温，整体预报效果优于NMC，资料按月划分的MOS预报效果优于资料按季划分，ECMOS月和T639MOS月是最高和最低气温的最优客观产品；最低气温预报中YBY优于T639MOS月，最高气温预报中ECMOS月优于YBY；两种最优客观预报产品一致的物理量为集中在中低层或地面的相当位温或假相当位温、温度、湿位涡、高度等，但各自还有一些起关键作用的入选因子影响最高、最低气温的预报。
Subjects: Biology >> Zoology submitted time 2018-12-25 Cooperative journals: 《动物营养学报》
Abstract：本试验旨在研究育成后期（10～17周龄）饲粮代谢能和蛋白质水平对大午粉1号商品代蛋鸡生长性能、器官指数、小肠发育以及产蛋高峰期生产性能和蛋品质的影响；通过建立饲粮代谢能和蛋白质水平与所检测指标之间的回归模型，得到育成后期大午粉1号商品代蛋鸡饲粮中适宜的代谢能和蛋白质水平。本研究共包括2个试验。试验1：随机选取810只64日龄蛋鸡，将其随机分为9组，每组6个重复，每个重复15只。采用3[代谢能水平：11.77（高）、11.27（中）、10.77 MJ/kg（低）]×3[蛋白质水平：16.50%（高）、15.50%（中）、14.50%（低）]试验设计，共配制9种试验饲粮，分别饲喂上述9组试验鸡，试验期8周（10～17周龄）。试验2：试验鸡的分组情况保持不变，所有试验鸡饲喂同一饲粮（代谢能水平：10.91 MJ/kg；蛋白质水平：15.98%），试验期14周（18～31周龄）。试验1结果显示：1）饲粮代谢能水平对蛋鸡平均日采食量（ADFI）、料重比（F/G）和胫骨长有显著影响（P＜0.05）；饲粮蛋白质水平对蛋鸡ADFI和胫骨长有显著影响（P＜0.05）；饲粮代谢能和蛋白质水平的互作效应对蛋鸡ADFI、平均日增重（ADG）和F/G均有显著影响（P＜0.05）。2）饲粮代谢能和蛋白质水平及二者的互作效应对蛋鸡各器官指数均无显著影响（P＞0.05）。3）饲粮代谢能水平对蛋鸡空肠、十二指肠、小肠长度有显著影响（P＜0.05）；饲粮代谢能和蛋白质水平的互作效应对蛋鸡空肠和小肠长度有显著影响（P＜0.05）。试验2结果显示：1）育成后期饲粮代谢能和蛋白质水平对蛋鸡产蛋高峰期生产性能均没有显著影响（P＞0.05），随着育成后期饲粮代谢能水平的升高，蛋鸡产蛋高峰期ADFI呈下降趋势；育成后期饲粮代谢能和蛋白质水平的互作效应对蛋鸡产蛋高峰期ADFI、平均日产蛋量、料蛋比（F/E）有显著影响（P＜0.05）。2）育成后期蛋鸡饲粮代谢能水平对蛋鸡产蛋高峰期蛋黄颜色和蛋形指数有显著影响（P＜0.05）；育成后期蛋鸡饲粮蛋白质水平对蛋鸡产蛋高峰期蛋黄颜色有显著影响（P＜0.05）；育成后期饲粮代谢能和蛋白质水平的互作效应对蛋鸡产蛋高峰期蛋壳厚度和蛋形指数有显著影响（P＜0.05）。通过对育成后期ADFI、F/G以及空肠、十二指肠、小肠长度和蛋黄颜色进行二次曲线拟合，得出大午粉1号商品代蛋鸡育成后期饲粮中适宜代谢能水平分别为10.902、10.720、11.404、11.446、11.374和11.760 MJ/kg；通过对育成后期胫骨长进行二次曲线拟合，得出大午粉1号商品代蛋鸡育成后期饲粮中适宜蛋白质水平为15.300%。综合上述指标，推荐育成后期（10～17周龄）大午粉1号商品代蛋鸡饲粮中代谢能水平为10.720～11.760 MJ/kg，蛋白质水平为15.300%。
Subjects: Biology >> Zoology submitted time 2018-12-24 Cooperative journals: 《动物营养学报》
Abstract：本试验通过建立饲粮能量或蛋白质水平与生长性能、血清生化指标、器官指数等指标的回归模型，旨在确定5～9周龄大午粉1号商品代蛋雏鸡对饲粮能量和蛋白质的需要量。选取810只遗传背景相同、体重接近、健康状态良好的28日龄大午粉1号商品代蛋雏鸡，随机分为9组，每组6个重复，每个重复15只蛋雏鸡。采用3×3双因素试验设计，设定饲粮中能量水平分别为12.42、11.92和11.42 MJ/kg，蛋白质水平分别为18.75%、17.75%和16.75%，共配制9种试验饲粮。试验期为35 d。结果显示：1）随着饲粮能量水平的升高，蛋雏鸡9周龄时胫长、胸宽、龙骨长、血清甘油三酯含量呈上升的趋势，5～9周龄平均日增重呈先下降后上升的趋势。2）随着饲粮蛋白质水平的升高，蛋雏鸡9周龄时体重（终末体重）、胸宽以及5～9周龄平均日增重呈先升高后降低的趋势。3）饲粮能量水平与蛋白质水平的互作效应对9周龄大午粉1号商品代蛋雏鸡的胸宽、龙骨长、血清甘油三酯含量有显著影响（P＜0.05)。4）通过对蛋雏鸡胸宽、龙骨长、血清甘油三酯含量与饲粮能量水平进行二次曲线拟合，得出饲粮适宜能量水平分别为11.420、11.483、11.379 MJ/kg，平均值为11.427 MJ/kg；通过对9周龄时体重与饲粮蛋白质水平二次曲线拟合，得到饲粮适宜蛋白质水平为17.902%。综合蛋雏鸡体尺指标、生长性能、器官指数和血清生化指标得出，5～9周龄大午粉1号商品代蛋雏鸡的能量和蛋白质需要量分别为11.427 MJ/kg、17.902%。
Subjects: Biology >> Zoology submitted time 2018-12-24 Cooperative journals: 《动物营养学报》
Abstract：本试验旨在研究3种蛋白酶对苏淮断奶仔猪生长性能、营养物质表观消化率和血清生化指标的影响。试验采用单因素随机区组设计，选取健康、平均体重为（9.24±0.84） kg的苏淮断奶仔猪120头，按体重、性别基本一致的原则随机分为4组，每组6个重复，每个重复5头猪。对照组断奶仔猪饲喂不添加任何蛋白酶的基础饲粮，试验组分别饲喂在基础饲粮中添加0.2 g/kg酸性蛋白酶（Ⅰ组）、0.2 g/kg中性蛋白酶（Ⅱ组）和0.1 g/kg碱性蛋白酶（Ⅲ组）的饲粮。试验预试期5 d，正试期45 d。结果表明：1）与对照组相比，Ⅰ组的末重、平均日增重（ADG）和平均日采食量（ADFI）有显著提高（P0.05）。Ⅲ组的ADG显著高于对照组（P0.05），Ⅲ组的腹泻率和粪便指数最低。3）与对照组相比，试验组的干物质（DM）表观消化率和有机物（OM）表观消化率均显著提高（P0.05）。由此可知酸性蛋白酶在提高苏淮断奶仔猪生长性能和营养物质表观消化率方面的效果较好，而中性蛋白酶和碱性蛋白酶在减少营养性腹泻方面的效果较好。
Subjects: Biology >> Zoology submitted time 2018-12-24 Cooperative journals: 《动物营养学报》
Abstract：本试验旨在研究3种蛋白酶对苏淮断奶仔猪生长性能、营养物质表观消化率和血清生化指标的影响。试验采用单因素随机区组设计，选取健康、平均体重为（9.24±0.84） kg的苏淮断奶仔猪120头，按体重、性别基本一致的原则随机分为4组，每组6个重复，每个重复5头猪。对照组断奶仔猪饲喂不添加任何蛋白酶的基础饲粮，试验组分别饲喂在基础饲粮中添加0.2 g/kg酸性蛋白酶（Ⅰ组）、0.2 g/kg中性蛋白酶（Ⅱ组）和0.1 g/kg碱性蛋白酶（Ⅲ组）的饲粮。试验预试期5 d，正试期45 d。结果表明：1）与对照组相比，Ⅰ组的末重、平均日增重（ADG）和平均日采食量（ADFI）有显著提高（P0.05）。Ⅲ组的ADG显著高于对照组（P0.05），Ⅲ组的腹泻率和粪便指数最低。3）与对照组相比，试验组的干物质（DM）表观消化率和有机物（OM）表观消化率均显著提高（P0.05）。由此可知酸性蛋白酶在提高苏淮断奶仔猪生长性能和营养物质表观消化率方面的效果较好，而中性蛋白酶和碱性蛋白酶在减少营养性腹泻方面的效果较好。
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-12-13 Cooperative journals: 《计算机应用研究》
Abstract： To solve the problem that iterative closest point (ICP) algorithm has a single feature for searching and low accuracy for registration, this paper proposed a point cloud registration algorithm that based on multiple-feature matching. It chose the improved adaptive octree algorithm to segment the point cloud. Then calculated the multiple features of the points after performed moving least squares (MLS) algorithm to fit the leaf nodes. Next, this algorithm introduced the point pairs similarity that based on multiple features to establish the matching points. Lastly, computed the rotation matrix and translation matrix to achieve registration. Experiments show that this algorithm can effectively improve the accuracy of registration on the basis of keeping the point cloud registration speed high. And with the number of point sets increasing, the trend of accuracy for this method is increasing.
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-11-29 Cooperative journals: 《计算机应用研究》
Abstract： Path planning optimization problem has always been one of the important issues of the mobile robotics research. With the expansion of the fields of mobile robot applications and the complication of its working environment, traditional path planning algorithms become difficult to meet people's requirements due to their own limitations. In recent years, bioinspired intelligent algorithms（BIAs）are widely used in mobile robot path planning optimization because of its collective intelligence of the group and the characteristics of biological preference. First, this paper classifies the bioinspired intelligent algorithms used in the path planning optimization according to their sources of the biomimetic mechanism. Then, to optimize the latest research results and summarize existing problems and solutions, various new bioinspired intelligent algorithms used in the path planning optimization are described systematically according to different categories, and a detailed comparison and analysis of the algorithms performance in path planning optimization is also provided. Finally, further research direction about it will be discussed.
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