An Economics Approach to Hard Computational Problems

A general method for combining existing algorithms into new programs that are unequivocally preferable to any of the component algorithms is presented. This method, based on notions of risk in economics, offers a computational portfolio design procedure that can be used for a wide range of problems. Tested by solving a canonical NP-complete problem, the method can be used for problems ranging from the combinatorics of DNA sequencing to the completion of tasks in environments with resource contention, such as the World Wide Web.     

乌兰沙漠现状及治理途径探讨

通过分析乌兰县的沙漠化现状和危害情况,提出本区治理沙漠化的途径与建议。     

托克逊县部分地区寄生于牛体表的媒介蜱形态学鉴定

托克逊地区常年高温,气候环境适宜媒介蜱的滋生,其所携带与传播的疾病给该地区带来了巨大的危害。为了解托克逊县部分地区分布的优势蜱种,对采集的托克逊地区牛体表寄生虫——蜱(n=547)进行显微镜观察与鉴定。经鉴定为残缘璃眼蜱、麻点璃眼蜱共2个种。其中残缘璃眼蜱为517只,麻点璃眼蜱为30只,即残缘璃眼蜱为该地区的优势蜱种。该结果对开展地方性蜱类与蜱传疾病的防治工作具有重要意义。     

基于CFD木材干燥进出风参数优化及干燥过程模拟

为探究在改变引入进出风口流速配比等因素下的木材中心含水率的变化情况,使用DesignModeler及NX10.0建立木材干燥域的三维流场模型,并通过结合CFD及正交试验方法,对单个木材在给定的多组试验工况下进行模拟,得到了试验各因素下最佳水平的参数组合。结果表明,合理地配置进出风口流速及气流温湿度对降低木材中心含水率有明显影响,为强制进排风干燥过程中控制干燥进程,通过平衡进出风口流速来调整木材（中心）干燥速率提供了理论依据。     

大麦新品种蒙啤麦6号的选育及栽培技术

蒙啤麦6号(原代号11PJ-005)为内蒙古自治区农牧业科学院作物育种与栽培研究所通过杂交育种培育的新品种,2019年9月通过非主要农作物品种登记审核。经品系鉴定、品系比较、区域试验及生产示范,均表现高产、优质、酿造品质好等特点。蒙啤麦6号属春性二棱皮大麦中熟品种,生育期66~90 d,株高56.0~84.4 cm,穗长7.1~7.5 cm,主穗粒数20~24粒/穗,千粒质量40.9~54.9 g,籽粒蛋白质含量11.7%。该品种中抗条纹病、网斑病,高感根腐病,抗倒性强,适宜在内蒙古及邻近省份春季种植。     

艾比湖流域降水与径流变化特征分析

以艾比湖流域的博尔塔拉河（博河）和精河为例,基于1961-2008年的水文气象数据,运用Mann-Kendall非参数检验、线性倾向估计、小波分析等方法,分析流域内2条河流的变化趋势及周期特征,得到以下结论：（1）48年来,艾比湖流域博乐站和精河站降水量均呈现增加的趋势,其中,博乐站的线性倾向斜率为8.54mm/10年;精河站的线性倾向斜率为12.74mm/10年。（2）博河和精河年径流量均呈现极显著的增加趋势,其Z值分别为2.42和2.45,两者均通过а=0.05显著性检验。（3）艾比湖流域年降水量序列的小波系数等值线分布比较密集,存在明显的小波系数高低值中心震荡。两站年降水量在48年的时间序列中存在多个周期。（4）流域内2条河流均有明显的周期性变化,尤其以年代际周期最为显著。在每个周期中径流量又经历了几次＂丰枯＂交替。（5）博河和精河2条河流径流量与降水量的相关系数分别为0.564和0.490,均通过a=0.01的R显著性检验,表明降水是流域径流量的重要补给源之一。     

In Vitro Evaluation of Liquid‐stored Buffalo Semen at 5°C Diluted in Soya Lecithin Based Extender (Bioxcell®), Tris‐Citric Egg Yolk,Skim Milk and Egg Yolk‐Citrate Extenders

This study was designed to compare the quality of liquid‐stored buffalo bull spermatozoa in soya lecithin based extender Bioxcell^® (BIOX), milk (MILK), tris‐citric egg yolk (TEY) and egg yolk‐citrate (EYC) extender at 5°C. Semen was collected from five Nili‐Ravi buffalo (Bubalus bubalis) bulls of 6–7 years of age with artificial vagina over a period of 3 weeks (two consecutive ejaculates once in a week). Semen ejaculates having more than 60% motility were pooled, split into four aliquots, diluted (37°C; 10 × 10⁶ motile spermatozoa/ml), cooled from 37 to 5°C in 2 h (0.275°C/min) and stored for 5 days. Sperm motility, viability, plasma membrane integrity (PMI) and normal acrosomal ridge were studied at first, third and fifth day of storage. Higher values of progressive sperm motility (%), sperm viability (%), sperm PMI (%) and normal apical ridge (%) were observed in BIOX, MILK and TEY extenders at first, third and fifth day of storage than EYC extender. Progressive sperm motility, sperm viability and sperm PMI in BIOX^® extender were not different from MILK and TEY extenders at 1st and third day storage period. However, at fifth day of storage, the values for these parameters remained significantly higher (p < 0.05) in BIOX^® compared with MILK, TEY and EYC extenders. At fifth day of storage, the semen quality parameters for Bioxcell^® were comparable to those with MILK and TEY extenders at third day of storage. In conclusion, motility, viability and PMI of buffalo bull spermatozoa remained similar in Bioxcell^®, milk and TEY extender at first and third days of storage at 5°C. Yet, the values for the aforementioned parameters in Bioxcell^® were higher compared with milk, TEY and EYC extender at fifth day of storage at 5°C.     

THE DIAGNOSIS AND EPIDEMIOLOGY OF AN INFERTILITY DISEASE IN THE FEMALE KOALA

A radiographic technique, incorporating pneumoperitoneum, was developed to aid in identification of cyst-like structures in the reproductive tract of female koalas. These lesions, including pyometra and fluid-filled cysts associated with the upper reproductive tract, were viewed as radiopacities with clearly demarcated margins lateral to the caudal lumbar vertebrae. This technique provided a means of assessing with a high degree of reliability the incidence and distribution of this condition in various populations of koalas throughout eastern and southern Australia. A radiographic survey of 237 adult female koalas revealed a 43% (101/237) incidence of this condition, which is closely correlated with the lack of reproductive success observed in some populations of koalas in the wild. Although the etiology of this condition is little understood at present, the isolation of Chlamydia psittaci from the reproductive tracts of affected koalas, both male and female, is recorded.     

Postanesthetic Equine Myopathy Suggestive of Malignant Hyperthermia: A Case Report

Signs of malignant hyperthermia, including progressive increases in PaCO₂, skin temperature and heart rate, and elevated serum levels of potassium, inorganic phosphate, and creatine kinase, were identified in a halothane-anesthetized horse. Treatment was discontinuing halothane administration, applying ice and cold fluids, and hyperventilating with 100% oxygen. After an initial recovery, bilateral hindlimb myopathy and pigmenturia developed. The myopathy resolved after treatment with oral dantrolene, IV fluids, and hydrocortisone. Results of caffeine-halothane challenge, using semimembranosus muscle collected 2 weeks after the episode, were considered within normal limits for horses. The intraoperative abnormalities were evidently predictive of postanesthetic myopathy but the cause in this horse remained unclear.