低阶粉煤变径脉动气流分选动力学机理研究

针对传统湿法选煤方法存在的煤泥水处理困难、产品水分过高等问题,采用变径脉动气流分选装置对低阶粉煤进行了干法分选,并运用流体动力学、数值分析等方法研究了变径脉动气流分选过程的动力学机理。研究表明:与恒定流相比,脉动气流可加速颗粒运动过程,且颗粒越轻,脉动气流的周期性累积振荡加速效应越明显;采用变径脉动气流分选装置对6~0 mm粒级低阶粉煤进行分选,可使粉煤灰分降低2.55~3.28个百分点,分选数量效率最高可达91.02%。变径结构的减速效应可提高颗粒按密度分离的效果,进而提高分选精度。

日本临济宗与径山法脉

当今的日本佛教是以禅宗为主体的，而在镰仓时代前是以天台宗、真言宗(密宗)为主体。这个转变，有着不同寻常的历史过程。包括嗣法于径山的禅师及其日本弟子们，在这一转变过程中发挥了极为重要的作用。

香蕉交脉蚜发生及防治技术

香蕉交脉蚜又名蕉蚜、蕉黑蚜。近年来该虫发生严重,吸食植株汁液,传播香蕉束顶病毒,对当地香蕉生产影响很大。 一、形态特征 成虫可分为无翅蚜和有翅蚜两种类型。有翅蚜成虫体长1.7毫米,棕褐至黑褐色。头两侧具角瘤,触角6节,几与体等长。前翅径分脉与中脉有一段相交,径分脉端部分叉为2支,后翅翅脉退化,只有1根斜脉。无翅蚜体长0.7—1.0毫米,1龄时触角4节,2龄时触角5节,3龄和4龄时触角6节。 二、生活习性与危害 该虫以孤雌卵胎生方式繁殖,

横断山地区蝗虫新属——白纹蝗属研究

1983年印象初[动物学研究4(1)]发表了横断山地区蝗虫四新属七新种,其中有跃度蝗属(Podismopsis Zub.)两新种,即理塘跃度蝗P.litangensis Yin和短翅跃度蝗P.breviptera Yin,当时印象初曾提出该两种雄性前翅端部的形状与属征不符,列入跃度蝗属比较勉强。跃度蝗属在我国主要分布于东北及华北地区,目前在我国已有8种(不包括横断山地区的种类)。经将东北地区的跃度蝗种类和横断山地区的种类进行比较。

甲腹茧蜂属一新种记述

对野外采集的膜翅目甲腹茧蜂属 Chelonus Panzer1 80 6进行分类鉴定时 ,发现一新种 :留坝甲腹茧蜂 Chelonusliubaensis He sp.nov,新种与环甲腹茧蜂 Ch.annulatus Nees1 81 3相似 ,但有以下不同 :新种头于眼后圆形收缩 ,颜面宽为高的 1 .5倍 ;并胸腹节无横脊 ;径脉第 3段为第 2段的 4倍 ;胫节距略短于基跗节长的一半 ;产卵器长而直 ,伸出腹腔外。模式标本保存在陕西师范大学生命科学学院。

蜣蝇属一新种(双翅目:蜣蝇科)

蜣蝇属Apyrgota Hcndel在我国仅记载一种,即台湾产的台湾蜣蝇A.fbrmosanaHcnnig。属征是:触角第二节背面上方无裂缝,第三节端部圆形,触角芒分节不明显或由2节组成,触角沟不分隔。小盾片鬃一般4根或更多,第4+5径脉段上无小鬃,径中横脉r-m位于翅的中部或超过中部,中肘横泳m-cu不倾斜。本文记述我国福建产的一新种。模式标本保存于中国科学院动物研究所。

Research on the imaging of concrete defect based on the pulse compression technique

When the synthetic aperture focusing technology （SAFT） is used for the detection of the concrete, the signal-to-noise ratio （SNR） and detection depth are not satisfactory. Therefore, the application of SAFT is usually limited. In this paper, we propose an improved SAFT technique for the detection of concrete based on the pulse compression technique used in the Radar domain. The proposed method first transmits a linear frequency modulation （LFM） signal, and then compresses the echo signal using the matched filtering method, after which a compressed signal with a narrower main lobe and higher SNR is obtained. With our improved SAFT, the compressed signals are manipulated in the imaging process and the image contrast is improved. Results show that the SNR is improved and the imaging resolution is guaranteed compared with the conventional short-pulse method. From theoretical and experimental results, we show that the proposed method can suppress noise and improve imaging contrast, and can also be used to detect multiple defects in concrete.

A HIGH RESOLUTION WIDE SWATH SAR METHOD BASED ON INTRA-PULSE NULL STEERING AND MIMO

High Resolution Wide Swath (HRWS) Synthetic Aperture Radar (SAR) often suffers from low Signal-to-Noise Ratio (SNR) due to small transmitting antenna, especially in phased array antenna systems. Digital Beam Forming (DBF) based on Single Input and Multiple Output (SIMO) achieves receiving array gain at the cost of increasing data rate. This letter proposes a new HRWS SAR method, which employs intra-pulse null steering to get receiving gain in elevation and decrease the data rate, and Multiple Input and Multiple Output (MIMO) using Space-Time Block Coding (STBC) in azimuth to get transmitting gain and receiving array gain simultaneously. The feasibility is verified by deduction and simulations.

武夷山蛇蛉一新属新种(蛇蛉目:盲蛇蛉科)

在福建省武夷山自然保护区科学考察中发现一种个体相当大的盲蛇蛉,体色鲜明,特点突出,虽仅二雌,但可确定为一新属新种。模式标本保存在北京农业大学昆虫标本室。作者对福建农学院和福建省林业科学研究所以及标本的采集者致以衷心的谢意。

Comparison of the Radial Compliance of Three Kinds of Vascular Prostheses and Pig′s Carotid Based on Dynamic-simulated Condition

There are some problems in the vascular prostheses, which influence the health of the patients. This paper aims to the radial compliance of three kinds of vascular prostheses and the pig＇s carotid based on the dynamic-simulated condition. The radial compliance of knitted structure vascular prostheses with crimps ranged from 2.52% to 0.94%/100 mmHg, which was superior to e-FFFE and woven prostheses＇, ranged from 0.73% to 0.31%/100 mmHg and from 0.81% to 0.22%/100 mmHg. But comparing with the radial compliance of pig＇s carotid, ranged from 7.21% to 10.04% /100 mmHg, there was a big gap between them. And also the trend of the radial compliance of vascular prostheses was different from the real pig＇s carotid. There is a lot of work left to improve the radial compliance, not only to change the vascular prostheses＇ compliance, but also to meet with the real vascular.

Chinese expert consensus on the non-invasive imaging examination pathways of stable coronary artery disease

1 Introduction Early detection and diagnosis of stable coronary artery disease （SCAD） is essential for proactive secondary prevention of myocardial infarction （MI）, control of disease progress, and reduction of mortality. Clinical decision-making in modem medicine is increasingly dependent on cardiovascular imaging techniques. 2012 ACCF/AHA/ACP/AATS/ PCNA/SCAI/STS guideline for the diagnosis and management of patients with stable ischemic heart disease has been issued by American Heart Association （AHA）. European Society of Cardiology （ESC） has issued 2013 ESC guidelines on the management of stable coronary artery disease.

Long-term results of small-diameter proximal splenorenal venous shunt:A retrospective study

AIM:To investigate recurrent variceal hemorrhage and long-term survival rates of patients treated with partial proximal splenorenal venous shunt.METHODS:Patients with variceal hemorrhage who were treated with small-diameter proximal splenorenal venous shunt in Ruijin Hospital between 1996 and 2009 were included in this study.Shunt diameter was determined before operation using Duplex Doppler ultrasonography.Peri-operative and long-term results in term of rehemorrhage,encephalopathy and mortality were followed up.RESULTS:Ninety-eight patients with Child A and B variceal hemorrhage received small-diameter proximal splenorenal venous shunt with a diameter of 7-10 mm.After operation,the patients’mean free portal pressure (P<0.01)and the flow rate of main portal vein(P< 0.01)decreased significantly compared with that before operation.The rates of rebleeding and mortality were 6.12%(6 cases)and 2.04%(2 cases),respectively.Ninety-one patients were followed up for 7 mo-14 years (median,48.57 mo).Long-term rates of rehemorrhage and encephalopathy were 4.40%(4 cases)and 3.30% (3 cases),respectively.Thirteen patients(14.29%)died mainly due to progressive hepatic dysfunction.Fiveand ten-year survival rates were 82.12%and 71.24%,respectively.CONCLUSION:Small-diameter proximal splenorenal venous shunt affords protection against variceal rehemorrhage with a low occurrence of encephalopathy in patients with normal liver function.

Forest structure of a maple old-growth stand: a case study on the Apennines mountains(Southern Italy)

In Europe, very small forest areas can be considered to be old-growth, and they are mainly located in Eastern Europe. The typical structures of old growth forests infrequently occur in Mediterranean mountainous environments, since they have been affected by human activities for centuries. This study focused on a remote and almost pure Italian maple stand located in southern Italy, which has not been managed for long time due to its inaccessibility. The effects of natural evolution on the forest stand were evaluated through the analysis of the spatial and chronological structure and the regeneration patterns, then estimating the amounts and quality of deadwood occurrence. Across the whole stand, all the trees with DBH （diameter at breast height） larger than 50 cm （LLT, large living trees） were measured （DBH and height） and age was also determined through a dendrochronological approach. The diameters observed ranged between 50 and 145 cm with ages of 12o to ~5o years. The Latham index calculated for trees within the sample plot highlighted a multilayered canopy with a dominant layer of largeliving trees （age 〉 120 years）. The size-class distribution of stems had a reverse-J shape, and basal area was 52 m2 ha-1. Deadwood was exclusively constituted by standing dead trees and CWD and its volume was on average 31 m3 ha-1. Pure Italian maple forests are generally rare in Europe, and it was unexpected to find a forest stand characterized by a so complex structure with old growth attributes. The study of complex forest stand, even if small, could give precious information on the forest evolution, clarifying also diverse auto-ecological traits of tree species that usually are not common in our forests.

Topical anaesthesia before transradial approach for supraoartic vessels angiography and stenting in the elderly： a feasible alternative

Over the years, the use of transradial approach （TRA） for carotid artery stenting （CAS） with distal embolic protection has been recognized as a valid alternative to the conventional femoral approach, improving the outcomes compared to carotid endoatherectomy.0-33 Indeed, despite the femoral artery remains the conventional access site for the endovascular treatment of supraoartic vessels, concomitant anatomical variations and/or peripheral vascular disease could complicate the cannulation of such arteries. Moreover, the TRA has been related with a lower incidence of bleeding complications and a shorter bed rest after the interventional procedure.

Changes in Streamflow Regime Due to Anthropogenic Regulations in the Humid Tropical Western Ghats, Kerala State, India

Regulation of streamflow by a reservoir creates a flow regime much different from the preimpoundment period flow regime. Hydro-Electric Projects(HEPs) commissioned in the Western Ghat regions of the Kerala State, India during the last four decades caused considerable changes in the flow regimes of the rivers of the Kerala State in southwest India. In this paper, the Indicators of Hydrologic Alteration(IHA) approach proposed by Richter et al.(1996) is used to analyze flow regime changes in the Periyar and Muvattupuzha Rivers, due to the construction of the Idukki(1976), Idamalayar(1987) and Lower Periyar(1997) HEPs in the high ranges of the Western Ghats. Normal rainfall years(annual rainfall values within mean ± 0.75 standard deviation limits) are only considered in the analysis to focus on hydrologic alterations due to human activities. The mean hydrologic alteration in the Periyar River(deviation from the pre-development hydrologic indicator values) after commissioning of three HEPs is 35%. Inter-basin water transfer after power generation from the Idukki HEP resulted in a higher discharge in the adjacent Muvattupuzha River, leading to considerable changes in the hydroenvironment(mean hydrologic alterations varying between 57 to 63%). IHA parameters showing hydrologic alterations above the 67 th Percentile werefurther analyzed. For each of the pre-construction hydrologic parameters ± 1 standard deviation from the mean is set as the upper and lower management target limits. The values of each IHA parameter beyond these targets are considered as nonattainment. Considerable hydrologic alterations are observed, especially for low flows in both basins. Inter-basin transfer induced larger changes in flow parameters compared to intra-basin regulations. The study shows that under a proper water release and diversion scheme, the non-attainment of IHA parameters(values fall beyond the target limits) can be reduced. The findings of the study will be greatly beneficial to regional water management and restoration of an eco-environmental system in the humid tropical region.

Arterial-phase contrast-enhanced ultrasonography for evaluating anti-angiogenesis treatment: A pilot study

AIM:To verify whether arterial-phase contrast-enhanced ultrasonography(CEUS) of tumor parenchymal tissue is useful for evaluation of anti-angiogenesis agents.METHODS:Rabbits with liver tumor were subjected to CEUS,and images of the nodular maximal diameter in vascular phase were recorded.Image analysis was performed to plot the time intensity curve(TIC) at the tumor parenchyma,which set the diameter of the region of interest of intensity measurement.The TIC was calculated to obtain the time to peak intensity(TPI) and the magnitude of PI.Rabbits were randomly assigned to a treatment group with sorafenib and a control group.Two weeks later,the same ultrasound examination was repeated followed by pathological testing to assess the effect of sorafenib on the liver tumor.RESULTS:In four rabbits in the treatment group,the rate of change of tumor size was decreased comparedwith that of the control(the rate 2.3 vs 7.9,P = 0.02).The TPI of the treatment group elongated significantly(the rate 3.1 vs 1.1,P = 0.07 for SonoVue,2.0 vs 0.88,P = 0.09 for Sonazoid).The magnitude of PI showed no significant changes.In pathological examination,capillary diameters in the treatment group were significantly smaller than those in the control group(26.4 vs 42.8 μm,P = 0.013).CONCLUSION:Analysis of the TIC in the arterial phase of tumor tissue could evaluate the efficacy of antiangiogenesis drug treatment in liver tumor.

Generation of Broadband Attosecond Pulse via Controlling Quantum Path by Two Color Field in Long Wavelength Driving Regime

In this paper, we have investigated theoretically the high harmonic generation form helium atom in long wavelength driving regime at 2000 nm through solving time-dependent Schr6dinger equation. By adding a second harmonic pulse （1000 nm） and a UV attosecond pulse （200 nm） to the driving field, an efficient method for picking out and enhancing ionization path to generate high-yield supercontinuum harmonics is realized, and then an isolated sub-100 as pulse with a bandwidth of 190 eV is significantly obtained.

Pseudo-occlusion of the anastomotic pathway between the celiac and superior mesenteric arteries in 15 cases

Objective: To study the causes and value of the pseudo-occlusion of the anastoraotic pathway between celiac and superior mesenteric arteries. Methods: 15 patients including 12 patients with hepatocellular carcinoma and 3 patients with hepatic hemangioma underwent superior mesenteric arteriography (SMA) and celiac arteriography (CA) in interventional therapy. The angiographic features of the 15 cases were dynamically observed by 2 experienced radiologists in double-blind manner. Results: Similar interpretations were given by the 2 radiologists. In CA, pseudo-occlusion occurred at the bifurcation of the common hepatic artery and the celiac artery in 8 cases, at the bifurcation of the common hepatic artery and the gastroduodenal artery in 6 cases and at the bifurcation of the right hepatic artery and the celiac artery in 1 case. No occlusion was found in SMA and the angiographic wire and catheter could pass easily through the occluded regions seen in CA. Conclusion: Pseudo occlusion of the anastomotic pathway between the superior mesenteric and celiac arteries is rare phenomenon. Its cause was not identified in our cases. It may result from the hemodynamic change or abnormality of the hepatic artery. It is very important to understand the existence of pseudo-occlusion in order to guide the catheterization in interventional therapy.

Exploration and determination of the principles of rotary-percussive underground slimhole drilling

A possibility of the efficient use of rotary percussive drilling to provide drilling smaller diameter holes(40–70 mm) both in mining and prospecting is disclosed herein. A new construction designed for the nipple thread connection is described. The relative amplitude variation, change of power pulse time and energy in their propagation throughout the drilling tool are determined. A possibility of the efficient power pulse transfer along the drill string to the rock destruction tools with new nipple connections which allow automating the make-up and breakout system of drill pipe was supported by experiments.

Radiographical findings in patients with liver cirrhosis and hepatic encephalopathy

Background and aims:Hepatic encephalopathy is a common complication encountered in patients with liver cirrhosis.Hepatic encephalopathy is not reflected in the current liver transplant allocation system.Correlation was sought between hepatic encephalopathy with findings detected on radiographic imaging studies and the patient’s clinical profile.Methods:A retrospective analysis was conducted of patients with cirrhosis,who presented for liver transplant evaluation in 2009 and 2010.Patients with hepatocellular carcinoma,ejection fraction less than 60%and who had a TIPS(transjugular intrahepatic portosystemic shunting)procedure or who did not complete the evaluation were excluded.Statistical analysis was performed and variables found to be significant on univariate analysis(P<0.05)were analysed by a multivariate logistic regression model.Results:A total of 117 patients met the inclusion criteria and were divided into a hepatic encephalopathy group(n=58)and a control group(n=59).Univariate analysis found that a smaller portal vein diameter,smaller liver antero-posterior diameter,liver nodularity and use of diuretics or centrally acting medications showed significant correlation with hepatic encephalopathy.This association was confirmed for smaller portal vein,use of diuretics and centrally acting medications in the multivariate analysis.Conclusion:A decrease in portal vein diameter was associated with increased risk of encephalopathy.Identifying patients with smaller portal vein diameter may warrant screening for encephalopathy by more advanced psychometric testing,and more aggressive control of constipation and other factors that may precipitate encephalopathy.