全文获取类型
收费全文 | 4193篇 |
免费 | 184篇 |
专业分类
各国政治 | 232篇 |
工人农民 | 111篇 |
世界政治 | 439篇 |
外交国际关系 | 230篇 |
法律 | 1855篇 |
中国政治 | 20篇 |
政治理论 | 1451篇 |
综合类 | 39篇 |
出版年
2021年 | 23篇 |
2020年 | 49篇 |
2019年 | 59篇 |
2018年 | 97篇 |
2017年 | 111篇 |
2016年 | 143篇 |
2015年 | 91篇 |
2014年 | 81篇 |
2013年 | 628篇 |
2012年 | 119篇 |
2011年 | 97篇 |
2010年 | 115篇 |
2009年 | 128篇 |
2008年 | 116篇 |
2007年 | 134篇 |
2006年 | 131篇 |
2005年 | 124篇 |
2004年 | 117篇 |
2003年 | 114篇 |
2002年 | 116篇 |
2001年 | 72篇 |
2000年 | 88篇 |
1999年 | 73篇 |
1998年 | 97篇 |
1997年 | 76篇 |
1996年 | 43篇 |
1995年 | 74篇 |
1994年 | 66篇 |
1993年 | 69篇 |
1992年 | 71篇 |
1991年 | 55篇 |
1990年 | 55篇 |
1989年 | 65篇 |
1988年 | 63篇 |
1987年 | 74篇 |
1986年 | 61篇 |
1985年 | 76篇 |
1984年 | 62篇 |
1983年 | 50篇 |
1982年 | 55篇 |
1981年 | 53篇 |
1980年 | 39篇 |
1979年 | 43篇 |
1978年 | 37篇 |
1977年 | 34篇 |
1976年 | 26篇 |
1975年 | 22篇 |
1974年 | 23篇 |
1973年 | 24篇 |
1969年 | 20篇 |
排序方式: 共有4377条查询结果,搜索用时 0 毫秒
281.
282.
283.
Robert J. Sampson John H. Laub Elaine P. Eggleston 《Journal of Quantitative Criminology》2004,20(1):37-42
In response to Nagin's comment on our paper, Methodological Sensitivities to Latent Class Analysis of Long-Term Criminal Trajectories, we reconsider the robustness and validity of group-based approaches to criminal trajectories and introduce additional issues for future research. We emphasize the limitations of typological approaches and the dangers of reifying the idea of distinct offender groupings for research and policy. We also clarify misunderstandings about the use of hierarchical linear models for studying trajectories of crime. Our basic conclusion is that methods in criminology need to be more tightly linked with theory. 相似文献
284.
Robert?D.?DavisEmail author Cary?D.?Rostow James?B.?Pinkston Dennis?R.?Combs Dennis?R.?Dixon 《Journal of Police and Criminal Psychology》2004,19(1):17-26
This study reports an analysis of Bartol's (1991) Immaturity Index and Hargrave and associates' (1988) Aggressiveness Index
as a measure of police conduct. The correlations between the supervisory ratings and the Immaturity and Aggressiveness indices
were examined for 1020 law enforcement officers. The results showed that Immaturity Index was related to termination for failure
to complete training and insubordination. The Aggressiveness Index was related to a termination for failure to complete training
and several other problematic police behaviors, but was not found to be specifically linked with acts of aggression. Implications
for using these two indices in law enforcement selection are discussed.
Authors' Note: Cary Rostow, Ph.D. is president of Matrix, Inc., Baton Rouge, Louisiana, and is in private practice in Baton Rouge. Robert
Davis, Ph.D., is executive vice-president and director of science, research, and development for Matrix, Inc., and has a private
practice in Baton Rouge. James B. Pinston, Ph.D., is a clinical neuropsychologist within the department of neurology at the
Louisiana State University Health Sciences Center and School of Medicine in Shreveport, Louisiana. Dennis R. Combs, Ph.D.,
is an assistant professor of psychology at the University of Tulsa. Dennis R. Dixon, M.A., is currently a doctoral student
at Louisiana State University. 相似文献
285.
286.
In this paper, we describe the development of a device for fuming fingerprints with cyanoacrylate (Super Glue) to enable police tactical units to obtain fingerprint evidence from suspicious packages using a remote-controlled robot. Through a series of initial experiments and preliminary designs, we show that effective cyanoacylate fuming requires sufficient heat, humidity, and airflow. This work led to the development of a final working prototype, called robot accessory for fuming fingerprint evidence (RAFFE), which is currently being field tested by the Calgary Police Service. 相似文献
287.
The act of leaving a victim's body in an unusual position is a conscious criminal action by an offender to thwart an investigation, shock the finder and investigators of the crime scene, or give perverted pleasure to the killer. The unusual position concepts of posing and staging a murder victim have been documented thoroughly and have been accepted by the courts as a definable phenomenon. One staging case and one posing case are outlined and reveal characteristics of those homicides. From the Washington State Attorney General's Homicide Investigation and Tracking System's database on murder covering the years 1981-2000 (a total of 5,224 cases), the relative frequency of unusual body dispositions is revealed as a very rare occurrence. Only 1.3% of victims are left in an unusual position, with 0.3% being posed and 0.1% being staged. The characteristics of these types of murders also set them apart: compared to all other murders, in staged murders the victims and killers are, on average, older. All victims and offenders in the staged murders are white, with victims being disproportionately white in murders with any kind of unusual body disposition. Likewise, females stand out as victims when the body is posed, staged, or left in other unusual positions. Whereas posed bodies are more likely to include sexual assault, often in serial murders, there is no evidence of either in the staged cases. Lastly, when a body is left in an unusual position, binding is more likely, as well as the use of more "hands on" means of killing the victim, such as stabbing or cutting weapons, bludgeons, ligatures, or hands and feet. 相似文献
288.
A controlled laboratory experiment is described, in principle and practice, which can be used for the of determination the rate of tissue decomposition in soil. By way of example, an experiment was conducted to determine the effect of temperature (12 degrees, 22 degrees C) on the aerobic decomposition of skeletal muscle tissue (Organic Texel x Suffolk lamb (Ovis aries)) in a sandy loam soil. Measurements of decomposition processes included muscle tissue mass loss, microbial CO2 respiration, and muscle tissue carbon (C) and nitrogen (N). Muscle tissue mass loss at 22 degrees C always was greater than at 12 degrees C (p < 0.001). Microbial respiration was greater in samples incubated at 22 degrees C for the initial 21 days of burial (p < 0.01). All buried muscle tissue samples demonstrated changes in C and N content at the end of the experiment. A significant correlation (p < 0.001) was demonstrated between the loss of muscle tissue-derived C (Ct) and microbially-respired C (Cm) demonstrating CO2 respiration may be used to predict mass loss and hence biodegradation. In this experiment Q10 (12 degrees C-22 degrees C) = 2.0. This method is recommended as a useful tool in determing the effect of environmental variables on the rate of decomposition of various tissues and associated materials. 相似文献
289.
A simple method for analyzing nitrite in urine has been developed to confirm and quantify the amount of nitrite in potentially adulterated urine samples. The method involved separation of nitrite by capillary electrophoresis and direct UV detection at 214 nm. Separation was performed using a bare fused silica capillary and a 25 mM phosphate run buffer at a pH of 7.5. Sample preparation consisted of diluting the urine samples 1:20 with run buffer and internal standard, and centrifuging for 5 min at 2500 rpm. The sample was hydrodynamically injected, then separated using -25 kV with the column maintained at 35 degrees C. The method had upper and lower limits of linearity of 1500 and 80 microg/mL nitrite, respectively, and a limit of detection of 20 microg/mL. The method was evaluated using the National Committee for Clinical Laboratory Standards (NCCLS) protocol (Document EP10-A2), and validated using controls, standards, and authentic urine samples. Ten anions, ClO-, CrO4(-2), NO3-, HCO3-, I-, CH3COO-, F-, SO4-, S2O8(-2), and Cl-, were tested for potential interference with the assay. Interferences with quantitation were noted for only CrO4(-2) and S2O8(-2). High concentrations of Cl- interfered with the chromatography. The method had acceptable accuracy, precision, and specificity. 相似文献
290.
Suppression of environmental science 总被引:1,自引:0,他引:1
Kuehn RR 《American journal of law & medicine》2004,30(2-3):333-369