不同环大小分子筛对钼基分子筛催化剂上甲烷无氧芳构化反应的影响

钼基分子筛催化剂 ,由于不同分子筛的孔道大小及孔道形状不同 ,对甲烷芳构化反应表现出不同的催化性能 .具有 8元环孔道结构的小孔ERS 7分子筛没有催化活性 ,说明甲烷的芳构化反应离不开分子筛孔道的择形作用 ,较小的孔道中不能生成苯等芳烃 .具有 10元环孔道结构的ZSM 5 ,ZSM 11和ZRP 1三种分子筛具有较好的催化性能 ,但由于其孔道大小及孔道形状的差别在催化行为上表现出一定的差异 .具有 10元环和 12元环孔道结构的MCM 2 2分子筛 ,尤其对苯等轻芳烃而言 ,催化性能最佳 .具有 12元环孔道结构的JQX 1以及中孔分子筛SBA 15 ,虽然具有一定的催化性能 ,但活性较低 .研究结果表明 ,孔道大小与苯分子动态直径相近或孔道稍大的分子筛是催化甲烷芳构化反应的良好载体 。

精子染色质扩散实验中精子晕环类型与精液参数的相关性研究

目的探索精子染色质扩散实验(SCD)中精子晕环类型与精液参数的相关性。方法收集281例于南方医科大学南方医院生殖中心进行生育力评估的男性精液样本,进行精液常规分析及DNA损伤程度检测(SCD法)。依据SCD结果中各类型晕环精子百分比及总精子DNA碎片指数(DFI)的中位数,分别将研究对象分为A组(≤中位数者)和B组(>中位数者)。结果大晕环A组患者的前向运动精子百分比(PR%)显著低于大晕环B组[(34.00±19.07)%vs(41.35±18.78)%,P=0.001],大晕环A组不动精子百分比(IM%)显著高于B组[(54.72±20.75)%vs(46.46±20.83)%,P=0.001]。而中晕环、小晕环、无晕环、退化精子以及总DFI的A组与B组间精液常规参数均无统计学差异。结论大晕环精子百分比的降低与PR%的降低和IM%的增加有关,提示轻微的精子DNA损伤即可能反映着精子运动能力的减弱。

精子染色质扩散实验中精子晕环类型与体外受精/卵胞浆内单精子注射治疗结局相关性研究

目的探讨精子染色质扩散(SCD)实验中精子晕环类型与体外受精(IVF)/卵胞浆内单精子注射(ICSI)治疗结局的相关性。方法收集2017年7月至2019年7月于南方医科大学南方医院生殖医学中心进行IVF/ICSI治疗且男方接受了精液常规分析及SCD实验的184对夫妇的IVF/ICSI治疗相关数据。依据SCD结果中各类型晕环精子百分比及精子DNA碎片指数(DFI)的第25百分位数(P_(25))及第75百分位数(P_(75))的具体数值,将各晕环精子百分比及DFI各自分为3组:A组(≤P_(25))、B组(P_(25)~P_(75))、C组(≥P_(75))。采用非参数检验比较各组间受精率、卵裂率、优胚率、临床妊娠率及流产率。结果退化精子百分比A组、B组、C组患者的优胚率分别为(33.1±22.9)%、(31.6±23.6)%、(21.3±20.9)%,3组间比较差异有统计学意义(P=0.046)。小晕环精子百分比A组、B组、C组患者的流产率分别为22.2%、33.3%、83.3%,3组间比较差异有统计学意义(P=0.024)。各晕环精子百分比及DFI的不同亚组间受精率、卵裂率、临床妊娠率差异均无统计学意义(P>0.05)。结论退化精子百分比可能是预测胚胎质量更为敏感的指标,高小晕环精子百分比可能增加流产风险。

主动脉瓣复合体钙化分布密度是国产自膨式瓣膜TAVR术后传导障碍的危险因素

目的评估主动脉瓣复合体(AVC)不同区域钙化分布密度对应用国产自膨式瓣膜(SEV)行经导管主动脉瓣置换(TAVR)术后新发传导障碍(CB)的影响。方法纳入2016年1月~2022年12月接受国产Venus-A人工瓣膜置换术的重度主动脉瓣狭窄患者共73例,根据术后是否出现新发CB分为CB组和无CB组,比较两组基线数据、影像资料和手术数据情况。单因素、多因素Logistic回归分析TAVR术后新发CB的独立危险因素。应用受试者工作特征(ROC)曲线及DeLong检验,分析各危险因素及联合指标预测效能。结果73例TAVR患者中,18例(24.7%)术后新发CB。CB组具有更大的植入深度(6.77±2.45 mm vs 5.11±3.28 mm,P=0.027),且室间隔膜部长度与植入深度差值(MSID)明显小于无CB组(0.68±3.49 mm vs 2.82±3.88 mm,P=0.036)。钙化分布方面,CB组设备着陆区(DLZ)左冠窦(LCS)的钙化分布密度明显高于无CB组[10.34(2.50,48.35)×102 mm^(3)/mm^(2)vs 3.27(0.00,13.79)×102 mm^(3)/mm^(2),P=0.026]。多因素Logistic分析发现,DLZ-LCS钙化分布密度、MSID是TAVR术后新发CB的独立危险(保护)因素。ROC曲线显示,MSID、DLZ-LCS钙化分布密度预测CB的曲线下面积(AUC)分别为0.775和0.716,联合指标预测具有最大的AUC(0.890),与单独指标比较差异均有统计学意义(P=0.041 vs MSID;P=0.027 vs DLZ-LCS钙化分布密度)。结论DLZ-LCS钙化分布密度是国产SEV的TAVR术后新发CB的独立危险因素,联合MSID可以有效预测TAVR术后的传导并发症。

经导管主动脉瓣置换术前测量主动脉根部参数的一致性及与短期预后的关联性:基于Anythink和3mensio CT软件比较

目的通过对比国产半自动术前CT分析软件Anythink与3mensio应用于经导管主动脉瓣置换术前测量的数据,评价Anythink软件测量主动脉根部参数的一致性与短期预后间的关联性。方法回顾性纳入2016年12月~2022年2月于中国人民解放军总医院行TAVR手术的67例患者,由一名完成专业培训的心内科医生分别使用新型半自动分析软件Anythink与“金标准”3mensio软件同步重建主动脉根部模型,测量主动脉瓣环及周围结构,分析两种软件结果的相关性及一致性;由两名独立医生应用Anythink软件重复测量,评价Anythink对于同一研究对象测量的可重复性;依据Anythink和3mensio软件测量结果选取瓣膜型号,分析两软件在实际用于指导临床瓣膜选择时的异同。结果Anythink与3mensio测量的左冠脉开口高度(13.37±3.35 mm vs 13.19±3.19 mm)、右冠脉开口高度(15.45±2.89 mm vs 15.75±2.93mm)、瓣环直径(24.0±2.2 mm vs 23.9±2.3 mm)、瓣环面积(450.6±88.3 mm2 vs 447.5±90.0 mm2)、瓣环周长(76.5±7.2 mm vs 76.1±7.6 mm)、主动脉瓣环与水平面夹角(53.5°±10.0°vs 51.1°±9.7°)差异均无统计学意义(P>0.05)。Pearson相关分析结果显示,两软件测量数据呈正相关(r=0.884~0.981,P<0.01);Anythink测量瓣环数据组内相关系数ICC=0.894~0.992,组间相关系数ICC=0.651~0.954;Anythink与3mensio依据平均直径、面积直径、周长直径的选取瓣膜型号Kappa检验值分别为0.886、0.796、0.775;依据两次Anythink测量的平均直径、面积直径、周长直径选取瓣膜型号组内Kappa值为0.819、0.841、0.795,组间Kappa值为0.812、0.812、0.768。与患者短期预后关联性部分,在出现术后瓣周漏的患者中,Anythink测量面积直径相较于3mensio软件推荐的瓣膜型号略大,而在出现术后新发传导阻滞的患者中,Anythink推荐的瓣膜型号略小。结论国产半自动TAVR术前CT分析软件Anythink与3mensio软件在主动脉根部参数测量方面具有较好的一致性与较高的可重复性。经过专业训练的心内科医生可运用Anythink软件来获得相对准确的主动脉根部数据,为TAVR术前瓣膜型号的选择提供指导和参考。

输尿管囊肿的B超诊断

男性患者由小腹胀,解尿时淋沥不尽而来就诊。初诊为尿路感染,为排除前列腺疾病做了B超检查,发现右侧输尿管下段膀胱内入口处见一圆形光环,光环线纤细光滑,后方无增强效应,光环大小随输尿管喷尿动作呈周期性改变,喷尿时光环直径为11.9mm×19.3mm,静止时直径为11.3mm×12.2mm。 体会:输尿管囊肿在临床上无特殊症状。

Cardiopulmonary bypass induced microcirculatory injury of the small bowel in rats

AIM： To investigate microvascular injury quantitatively in the small bowel with respect to cardiopulmonary bypass （CPB） and related mechanisms. METHODS： In 10 male SD rats, normothermic CPB was established and continued with a flow rate of 100-150 mL/kg per minute for 60 min, while another 10 sham-operated animals served as controls. An approximate 10-cm loop of the terminal ileum was exteriorized for observation by means of intravital fluorescence microscopy. The small bowel microcirculatory network including arterioles, capillaries, and collecting venules was observed prior to CPB, CPB 30 min, CPB 60 min, post-CPB 60 min and post-CPB 120 rain. The intestinal capillary perfusion, microvascular permeability and leukocyte adherence were also measured. RESULTS： The systemic hemodynamics remained stable throughout the experiment in both groups. In CPB animals, significant arteriolar vasoconstriction, blood velocity reduction and functional capillary density diminution were found. As concomitances, exaggerated albumin extravasation and increased leukocyte accumulation were also noted. These changes were more pronounced and there were no signs of restitution at the end of the observation period. CONCLUSION： CPB induces significant microcirculatory injury of the small bowel in rats. The major underlying mechanisms are blood flow redistribution and generalized inflammatory response associated with CPB.

The Analysis of Gas Absorption into a Stationary Droplet in Atmospheric Environment

Absorption of gaseous species into stationary droplets is a fundamental interest of mass transfer between liquid droplets and ambient gas, which plays a key role in atmospheric environment control and many industrial applications. In this paper, two different considerations including equilibrium and non-equilibrium relations at the interface are used to analyze and predict the absorption time for a physical absorption at a relatively low solubility of gas. For the equilibrium pattern, in the beginning period of absorption, the mass transfer rate is considerably rapid and afterward becomes slower and slower and finally comes to almost zero as the droplet concentration closes to the saturated value. Differently, when the non-equilibrium model is adopted, the interfacial concentration increases gradually with the bulk concentration of liquid droplet, and the absorption rate mildly decelerates with the increase of bulk one throughout the process, which leads to a longer absorption time. Based on the diffusion equation of species, the concentration distribution within the droplet at different times is computed. A solution for CO2 absorption into a small water droplet is given.

Observations of Red-billed Spurfowl(Pternistis adspersus) in the arid Molopo Nature Reserve,North West Province,South Africa

Field work was conducted in the southern half of the Molopo Nature Reserve(MNR) near Vostershoop in the North West Province of South Africa to(1) describe the past and present distribution of Red-billed Spurfowl(Pternistis adspersus) in South Africa and(2) to describe the dispersion of Red-billed Spurfowl at waterholes in the MNR.The Red-billed Spurfowl did not colonize this area from Bo-tswana in the 1990s as reported in Hockey et al.(2005) and their distribution status and population sizes are not determined by long distance(30-100 km) and/or seasonal movements between the two countries.Red-billed Spurfowl are sparsely distributed and mainly occur in clusters near man-made waterholes.Waterholes provide water and food found in and around antelope droppings.The movement of the Red-billed Spurfowl between waterholes over short distances of 2-5 km was probably encouraged by the sinking of more boreholes since the 1980s(and the creation of 'veeposte'(game/livestock camps) around them).Low rainfall that results in limited insects is probably the single most important factor limiting populations of the Red-billed Spurfowl in South Africa.

Spring Cold Bias of SST and Minimal Wind Mixing in the Equatorial Pacific Cold Tongue

The authors investigate the relationship between bias in simulated sea surface temperature （SST） in the equatorial eastern Pacific cold tongue during the boreal spring as simulated by an oceanic general circulation model （OGCM） and minimal wind mixing （MWM） at the surface. The cold bias of simulated SST is the greatest during the boreal spring, at approximately 3℃. A sensi- tivity experiment reducing MWM by one order of magnitude greatly alleviates cold biases, especially in March-April. The decrease in bias is primarily due to weakened vertical mixing, which preserves heat in the uppermost layer and results in warmer simulated SST. The reduction in vertical mixing also leads to a weak westward current in the upper layer, which further contributes to SST warming. These findings imply that there are large uncertainties about simple model parameters such as MWM at the oceanic surface.

Microclimate in Hot Dry Damascus： The Influence of the Urban Environment on Human Perception

There is a broad recognition that microclimatic conditions contribute to the quality of life in cities. A favorable microclimate has a positive influence on both commercial and social activities. The aim of this study is to investigate the relationship between the human being and the surrounding thermal environment in terms of thermal acceptability, physical quality of the place, emotional state and the usage of the urban space in hot dry Damascus, Syria. The study is based on questionnaire surveys during the summer and winter in six locations with different microclimates. It is shown that the urban design plays a significant role in improving the microclimate, especially during the summer. The study also illustrates that when people＇s thermal perception is within the thermally acceptable range （i.e., slightly cool, comfortable and slightly warm） they experience the urban design as significantly more beautiful and more pleasant than during thermally unacceptable conditions. The results indicate that there is an interactive relationship between the urban design and humans＇ emotional state. Our findings suggest that a new perspective is needed for determining urban microclimate requirements and incorporating them into the urban design process to enhance the thermal environment in outdoor urban spaces in Damascus.

Familial and Territorial Values for Sustainable Entrepreneurship in Italy： Some Reflections in Theory and Practice]

This study reflects the specificities of family small- and medium-sized enterprises （SMEs） which are related to values, culture, and relationships with the territory （local context）. In the following sustainable and corporate social responsibility （CSR）-oriented strategies, family businesses are ＂assisted＂ by the presence of entrepreneurial values which are tied to and derived from the social system in the territory in which they are located. The aim of this study is to demonstrate that the consolidation of stable and durable relations between the family business and the local context depends on the presence of shared values between the members of the family and the stakeholders, all components of civil society are within the same territory. Such values are the fruit of a given territory＇s civic traditions. They are the result of an anthropological culture which is typical of the socioeconomic environment in which the entrepreneur, the family, and the business are all rooted, thus, they are expressions of a culture ＂of the place＂.

Organizational Environment and Work Satisfaction of the Employees of Hitachi Chemical Montemorelos Nuevo Leon México

This study seeks to answer one question： The quality level of organizational environment. Is it an indicator of the workplace satisfaction level, according to the perception of Hitachi Chemical employees in Montemorelos, Nuevo León, México？ This study＇s design is both explanatory and cross-sectional. The sample size was composed of 143 Hitachi Chemical employees of Montemorelos, Nuevo León, México. For the data collection, two instruments were used： the first instrument was used to measure the quality of organizational climate and the second was focused on measuring the workplace satisfaction level. As a result, the level of organizational climate quality is in fact a predictor of workplace satisfaction of Hitachi Chemical employees. After the regression analysis, it was found that the variable, level of organizational climate, explained a 71.4% variance in the dependent variable, work satisfaction. It was determined that organizational climate is a strong predictor of work satisfaction perceived by employees of Hitachi Chemicals, Montemorelos, Nuevo León, México. It can be established that the greater the levels of organizational climate experienced by the employees, the greater the level of work satisfaction will be.

Particle Size and Shape of On-road Suspended Coarse Dust in the Shijiazhuang City, China

The particle size and shape measured by image analysis is helpful to discuss the human health effects of particulate beside the aerodynamic scale. To explore the size and shape features of particle suspended in the road environment, this research selected 12 bus stations as the sampling sites along the main road in the air polluted city Shijiazhuang, China, where a Car-Free Campaign had been carried out. We hung 2 slides covered with a layer of petroleum jelly to collect suspending particles for 24 hours at each sampling site, and measured the particles size and shape parameters with the Particle Size Analyzer of CIS-50. The results show that the average particle size by the equivalent area diameter is around 10 μm, the size distributions are multi-modal with wide span, demonstrating that coarse dust suspended on road derived from several particle sources. Most of the particles suspended are square or square-like in shape with rugged border. Compared the samples of ordinary days and of the Car-Free day, the size and shape features vary little, inferring the ineffective results for the particle control of the Campaign. There is certain relationship between particle size and shape. The number percent of PMs-E （particulate matter with equivalent area diameter beneath 5 pro） is positively correlative with the number percent of particles of square or square-like shape, and negatively correlative with that of round or round-like shape. This relationship pattern in the road environment is contrary to the situations in the upper atmosphere, inferring different transportation and source emission mechanism influences.

Multi-environmental Evaluation of Triticale, Wheat and Barley Genotypes by GGE Biplot Analysis

The research was carried out with 9 triticale, 3 bread wheat, 3 durum wheat and 3 barley varieties and advanced lines in Tekirdag, Edime and Silivri locations during three years. In the study, the data obtained from combined variance analysis were performed and the significance of the differences between the averages was determined by LSD multiple comparison test. GGE biplot analysis and graphics were made by using the statistical package program. The genotypes G2 and G3 for thousand kernel weight, genotype G1 for the heading time and test weight, genotypes G14 and G15 for the maturation time, number of spikelets per spike and grain weight per spike and G13 for the plant height, spike length and grain yield per hectare decare revealed the highest values. The genotypes G6, GS, G4, G14, G9, G8 and G7 gave lower values than the average in terms of grain yield, whereas the other genotypes gave higher values than the general average. According to biplot graphical results, while locations 1 and 8 were closely related, locations 9, 2 and 7 were positively related to these environments. Although the location 7 is slightly different from the other 4 locations, these 5 locations can be seen as a mega environment. Genotypes G12, G2, G3 and G10 for this mega-environment showed the best performances. According to the results of grain yields obtained from 9 different locations, the location 5 was the most discriminating area while the location 1 was the least discriminating. Location 2 was the best representative location, while locations 4 and 7 were with the lowest representation capability. The locations that are both descriptive and representative are good test locations for the selection of adapted genotypes. Test environments, such as location 8, with low ability to represent are useful for selecting genotypes that perform well in specific regions if the target environments can be subdivided into sub-environments.

Atmospheric Environmental Quality Prediction Based on Support Vector Machine

The economic development bring serious environmental problems to China, the quality of atmospheric environment has an important bearing on the forecast. Be aimed at the complexity and non-linear of the quality of atmospheric environment, chaos theory has been put forward which takes full advantage of using date information. Based on the reconstruction of time-series phase space of the quality of atmospheric environment with the use of least squares support vector machine theory, the atmospheric environment prediction model was built up, and 25 years of historical data viewed as the raw data of the quality of the environment in Benxi City, giving a practical example, it shows that the results forecasted by the least squares support vector machine and the actual results match the better the forecast accuracy also meet the engineering application.

为你的秀发扮秋妆

1.克里斯汀娜背部和两边拥有长长的固定长发、围着脸部的则是长的层次,以及较短的刘海。利用热发卷来制造卷曲的纹理。

Acyclic edge coloring of planar graphs without adjacent cycles

A proper edge coloring of a graph G is said to be acyclic if there is no bicolored cycle in G.The acyclic edge chromatic number of G,denoted byχ′a(G),is the smallest number of colors in an acyclic edge coloring of G.Let G be a planar graph with maximum degree.In this paper,we show thatχ′a(G)+2,if G has no adjacent i-and j-cycles for any i,j∈{3,4,5},which implies a result of Hou,Liu and Wu(2012);andχ′a(G)+3,if G has no adjacent i-and j-cycles for any i,j∈{3,4,6}.