检索结果-南通市图书馆

The Strengths and Difficulties Questionnaire： A Pilot Study on the Reliability and Validity of the Self-report Version to Measure the Mental Health of Zambian Adolescents

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

j.urnal of Health Science 2014年第3期2卷 127-134页

作者： j. anitha menon Department of Psychology University of Zambia Lusaka 38301 Zambia

The study had the obj.ctive of exploring the feasibility of using the self-report SDQ-Y （youth version of strengths and difficulties questionnaire） to assess the emotional and behavioural well being of adolescents in Zambia. This was a cross sectional study of Lusaka school children （n = 420） aged 11-15 years using the self-report SDQ-Y and a demographic questionnaire. It was found that compared to a UK normative sample, Zambian adolescents were almost twice as likely to have total difficulties scores in the abnormal range （O.R. 1.9）. It was found that there was a significant difference in the total SDQ scores （Z = -2.67, P = 0.008） with children reporting health problems having significantly higher scores. Children reporting health problems also had significantly more emotional problems （Z = -2.78, P = 0.005）. There was a trend for children with health problems to score higher on the hyperactivity scale （Z = -1.9 P = 0.053）. The internal consistency of SDQ subscales ranged from low to moderate. It can be concluded that SDQ is a useful instrument for use with Zambian adolescents, in particular, the total difficulties score and the emotional difficulties score performed well in this sample and could potentially be used to screen for mental health problems or to examine the impact of interventions.

关键词： Strengths and difficulty questionnaire adolescents Zambia reliability validity.

Cleaning properties of dry adhesives

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2010年第11期53卷 2942-2946页

作者： j. P. DíAZ TéLLEZ D. SAMEOTO C. menon MENRVA Group School of Engineering Science Simon Fraser University Department of Mechanical Engineering University of Alberta

In this paper we present a study into the cleaning properties of synthetic dry adhesives. We have manufactured the adhesive micro-fibres through a low-cost, high yield fabrication method using Sylgard 184 Polydimethylsiloxane (PDMS) as the structural material. We deliberately contaminated the adhesive samples with different sized particles in the micro and macro scales and tested different cleaning methods for their efficacy with respect to each particle size. We investigated different cleaning methods, which included the use of wax moulding, vibration and pressure sensitive adhesives. For adhesion testing we used a custom system with a linear stage and a force sensor indenting a hemispherical probe into the adhesive surface and measuring the pull-off force. To characterize the cleaning efficacy we visually inspected each sample in a microscope and weighed the samples with a microgram-accuracy analytical balance. Results showed that the moulding method induced adhesion recovery in a greater percentage than the other cleaning methods and even helped with the recovery of collapsed posts in some cases. On the other hand pressure sensitive adhesives seem to have the upper hand with regards to certain particle sizes that can potentially pose problems with the moulding method.

关键词： biomimetic dry adhesive PDMS self-cleaning gecko climbing

维普期刊数据库

Learning-based j.int UAV traj.ctory and power allocation optimization for secure IoT networks

在线全文

学校读者我要写书评

暂无评论

Digital Communications and Networks 2022年第4期8卷 415-421页

作者： Dan Deng Xingwang Li Varun menon Md j.lil Piran Hui Chen Mian Ahmad j.n School of Information Engineering Guangzhou Panyu PolytechnicGuangzhou410630China School of Physics and Electronic Information Engineering Henan Polytechnic UniversityJiaozuo454150China Department of Computer Science and Engineering SCMS School of Engineering and TechnologyIndia Department of Computer Science and Engineering Sejong UniversitySouth Korea Department of Computer Science Abdul Wali Khan University MardanPakistan

Non-Orthogonal Multiplex Access(NOMA)can be deployed in Unmanned Aerial Vehicle(UAV)networks to improve spectrum *** to the broadcasting feature of NOMA-UAV networks,it is essential to focus on the security of the wireless *** paper focuses on maximizing the secrecy sum rate under the constraint of the achievable rate of the legitimate *** tackle the non-convexity optimization problem,a reinforcement learning-based alternative optimization algorithm is ***,with the help of successive convex approximations,the optimal power allocation scheme with a given UAV traj.ctory is obtained by using convex optimization ***,through plenty of explorations of the wireless environment,the Q-learning networks approach the optimal location transition strategy of the UAV,even without the wireless channel state information.

关键词： Unmanned aerial vehicle(UAV) NOMA Reinforcement learning Secure communications Deep Q-learning

On the Use of Quaternions, Dual Quaternions, and Double Quaternions For Freeform Motion Synthesis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

机械设计与研究 2004年第Z1期20卷 147-150页

作者： Q.j.Ge A.Varshney j.menon C.Chang State University of New York Stony Brook New York USA State University of New York Stony Brook New York USA IBM T. J. Watson Research Center Yorktown Heights New York USA State University of New York Stony Brook New York USA

Recently, there has been considerable effort to bring together quaternion-based representations of spatial displacements with curve design techniques in Computer Aided Geometric Design (CAGD) to develop methods for synthesizing freeform Cartesian motions. These methods have a wide range of applications from computer graphics,Cartesian motion planning for robot manipulators to task specification and motion approximation for spatial mechanism design. This paper compares the use of quaternions, dual quaternions, and double quaternions for freeform motion synthesis in a CAD environment.

关键词： quaternions, CAGD, motion animation

Bone mineral density and disorders of mineral metabolism in chronic liver disease

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World j.urnal of Gastroenterology 2009年第28期15卷 3516-3522页

作者： j.e George Hosahithlu K Ganesh Shrikrishna Acharya Tushar R Bandgar Vyankatesh Shivane Anj.na Karvat Shobna j.Bhatia Samir Shah Padmavathy S menon Nalini Shah Department of Endocrinology Seth G.S. Medical College and KEM Hospital Department of Gastroenterology Seth G.S Medical College and KEM Hospital Department of Gastroenterology Jaslok Hospital

AIM： To estimate the prevalence and identify the risk factors for metabolic bone disease in patients with cirrhosis. METHODS： The study was performed on 72 Indian patients with cirrhosis （63 male, 9 female; aged 〈 50 years）. Etiology of cirrhosis was alcoholism （n = 37）, hepatitis B （n = 25） and hepatitis C （n = 10）. Twenty-three patients belonged to Child class A, while 39 were in class B and 10 in class C. Secondary causes for metabolic bone disease and osteoporosis were ruled out. Sunlight exposure, physical activity and dietary constituents were calculated. Complete metabolic profiles were derived, and bone mineral density （BMD） was measured using dual energy X ray absorptiometry. Low BMD was defined as a Z score below -2. RESULTS： Low BMD was found in 68% of patients. Lumbar spine was the most frequently and severely affected site. Risk factors for low BMD included low physical activity, decreased sunlight exposure, and low lean body mass. Calcium intake was adequate, with unfavorable calcium： protein ratio and calcium： phosphorus ratio. Vitamin D deficiency was highly prevalent （92%）. There was a high incidence of hypogonadism （41%）. Serum estradiol level was elevated significantly in patients with normal BMD. Insulin-like growth factor （IGF） 1 and IGF binding protein 3 levels were below the age-related normal range in both groups. IGF-1 was significantly lower in patients with low BMD. Serum osteocalcin level was low （68%） and urinary deoxypyridinoline to creatinine ratio was high （79%）, which demonstrated low bone formation with high resorption. CONCLUSION： Patients with cirrhosis have low BMD. Contributory factors are reduced physical activity, low lean body mass, vitamin D deficiency and hypogonadism and low IGF-1 level.

关键词： Bone mineral density Liver disease Chronic disease Cirrhosis Bone mineral metabolism Hepatic osteodystrophy

On the Use of Quaternions, Dual Quaternions, and Double Quaternions For Freeform Motion Synthesis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

On the Use of Quaternions, Dual Quaternions, and Double Quat...

视力损害中的复杂视幻觉:一种结构性病史采集方法

第十四届全国机构学学术研讨会暨第二届海峡两岸机构学学术交流会

作者： A．Varshney j.menon State University of New York Stony Brook New YorkUSA IBM T.j.Watson Research Center Yorktown Heights New YorkUSA

Recently,there has been considerable effort to bring together quaternion-based representations of spatial displacements with curve design techniques in Computer Aided Geometric Design (CAGD) to develop methods for synthesizing freeform Cartesian *** methods have a wide range of applications from computer graphics, Cartesian motion planning for robot manipulators to task specification and motion approximation for spatial mechanism *** paper compares the use of quaternions,dual quaternions,and double quaternions for freeform motion synthesis in a CAD environment.

关键词： quaternions CAGD motion animation

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

世界核心医学期刊文摘(眼科学分册) 2006年第1期 22-23页

作者： menon G.j. 王大江 UnitedKingdom Royal Eye Infirmary Apsley Road Plymouth PL4 6PL

Obj.ctive: To study complex visual hallucinations in visually impaired individuals. Methods: A prospective comparative study involving structured history taking and cognitive assessment in 48 consecutive visually impaired individuals with best-corrected visual acuity of 20/200 or worse and an agematched cohort of 48 consecutive patients with visual acuity of 20/40 or better in at least 1 eye. Results: Thirty visually impaired subj.cts (63% ) experienced hallucinations, unrelated to specific ocular pathology. None volunteered the symptom; 2 admitted hallucinations on nonleading questioning and 28 on direct questioning. All displayed insight into the unreality of their hallucinations, although 18 (60% ) achieved this after initial deception. Seventeen (57% ) expressed concern; 7 (23% ) experienced disturbing images. Nineteen (63% ) feared being labeled as insane were they to admit to hallucinations, while 10 (33% ) were fearful of impending insanity. Sixteen (94% ) of 17 concerned patients derived comfort from sympathetic reassurance that their hallucinations did not represent sinister pathology. In contrast, none of the individuals with normal vision experienced any hallucinations (P < .001). Cognition was intact in all groups. Conclusions: Complex visual hallucinations with insight commonly occur in visually impaired, cognitively intact individuals due to acquired visual impairment and are unrelated to chronological age. Hallucinatory experiences are almost invariably admitted to only on direct questioning, due to fears of being considered insane. Although generally pleasant, hallucinations may cause distress, because of content or implications of the hallucinatory activity. Sympathetic explanation affords significant emotional relief.

关键词：视幻觉患者视力损害病史采集结构性

在已行经皮冠状动脉介入手术、因疑似急性冠状动脉综合征入院的患者中曾采用裸金属支架与药物洗脱支架治疗对临床决策影响的比较

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

世界核心医学期刊文摘（心脏病学分册） 2006年第12期2卷 18-19页

作者： j.shi j. menon V. Vaidean G. G.A. Stouffer 王亭忠 Division of Cardiology University of North Carolina Chapel Hill NC United States Dr.

To determine whether the decreased rate of restenosis observed with drug-eluting stents(DES) has changed the treatment of patients with recurrent symptoms after stent placement, we compared patients hospitalized with presumed cardiac symptoms within 1 year after placement of either a DES or a bare metal stent(BMS). In this retrospective, single-center study, cases were identified from consecutive patients who received a DES from March 2003 to j.ly 2004 or a BMS from August 2001 to j.ne 2002. No differences were noted in the rate of hospitalization, hospitalization for presumed cardiac symptoms, use of coronary angiography in patients hospitalized for presumed cardiac symptoms, or average interval to hospitalization. In contrast, restenosis and the need for additional revascularization procedures were higher in the BMS group. The primary indication for additional revascularization was restenosis in the BMS group and progression of coronary artery disease in the DES group. In the DES group, the need for revascularization was significantly higher in patients with multi-versus single-vessel coronary artery disease(26%vs 7%, p< 0.05). In conclusion, the rate of hospitalization and use of coronary angiography in patients with recurrent symptoms were similar in patients who received a BMS or DES, despite the decreased rates of restenosis and additional revascularization procedures observed with DESs.

关键词：药物洗脱支架金属支架矿山支架再狭窄率患者

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

来自姜烯的新香料的合成及其香气特征

香料香精化妆品 1992年第1期 46-49,60页

作者： A.Nirmala menon j.Madhusudana Rao 施立人

芳姜黄醇以及其相应的醚和酯以中等收率从姜烯通过芳姜黄烯氢氯化物的生成来合成的。利用光谱法对4种芳姜黄醚和4种芳姜黄酿进行了检定。芳姜黄醇、醚和酯的香气特征都作了叙述。

关键词：姜烯香料合成香气特征

维普期刊数据库