A method for studying knife tool marks on bone

The characteristics of knife tool marks retained on hard tissues can be used to outline the shape and angle of a knife. The purpose of this study was to describe such marks on bone tissues that had been chopped with knives. A chopping stage with a gravity accelerator and a fixed bone platform was designed to reconstruct the chopping action. A digital microscope was also used to measure the knife angle (θ) and retained V-shape tool mark angle (ψ) in a pig skull. The κ value (elasticity coefficient; θ/ψ) was derived and recorded after the knife angle (θ) and the accompanied velocity were compared with the proportional impulsive force of the knife and ψ on the bone. The constant impulsive force revealed a correlation between the V-shape tool mark angle (ψ) and the elasticity coefficient (κ). These results describe the tool marks--crucial in the medicolegal investigation--of a knife on hard tissues.     

Deep incisional neck injuries caused by an electric knife

Electric knives, due to the double blades swinging in opposite directions, have a high injury potential. Tissues such as skin can be cut smoothly without cutting motion and with only little pressure. Authors report on the case of a woman of 47 years who cut herself deeply on both sides of her neck with an electric knife, slightly carving a notch into the larynx and a cervical vertebra and opening large blood vessels. With respect to the extent of injuries the capacity to act had to be questioned. However, considering the absence of venous air embolism and the peculiarity of the tool it had to be assumed that the capacity to act lasted for a short time.     

Puncture wounds caused by glass mistaken for with stab wounds with a knife

Three cases are presented where fatal puncture wounds caused by broken glass were very similar to stab wounds inflicted by a knife with a single-edged blade. Thus, all three cases caused a murder investigation to be initiated. It could only be determined that these wounds had been caused by glass after a detailed forensic autopsy. In two of the three cases, the only evidence for this was the identification of glass fragments in the wounds. The importance of X-ray examinations is underlined because modern glass in common use is radiopaque. Glass fragments lodged in the wounds can reduce the loss of blood and thus, prolong the capacity to act despite severe injuries.     

Strangulation marks in homicides caused by choking ? On an irritant blood stain picture

Three homicides and one attempted homicide by choking in which apparent signs of throttling were present on the skin of the neck are described. The victims wore slender necklaces which were pressed against the skin by the hands of the perpetrator, causing transverse hematomas and cutaneous abrasions. The following criterious are typical for simulated signs of throttling: similarity to objects on the neck, incomplete course around the neck, absence of coarctation of the soft tissues, no lesions of subcutaneous structures.     

Characteristics of gunshot wounds caused by the special forces shooting knife (NRS and NRS-2)

Gunshot wounds of skin and long cortical bones inflicted by the special intelligence knife (NRS and NRS-2: special silent cartridges SP-3 and SP-4) from different distances were examined. Stereomicroscopy, emission spectral analysis, contact-diffusion method and regression- step-by-step analysis were made use of within the case study. A lack of mechanical, thermal or chemical impact from firing gas and of fire soot as well as presence of particles of rubber, copper and sealing varnish, i.e. the most informative shot products, were found to be the main distinctive features in the said wounds. The data obtained can be used in the differential diagnosis of a type and model of the used gun.     

Similar skin lesions in victim and perpetrator caused by a knife with a serrated blade

Reported in this paper is an attack of two adolescents on a man who was killed in the fight, with several kitchen knives being used, including two with grooved and wave-grooved blades. One of the offenders held the victim tight from behind and was injured by his attacking accomplice++. A grid mark on the left side of the victim's face and the left forearm of the second offender in the back supported the assumption of a knife with simple wave profile. Skin lesions of finer structure below the left ear and on the left forearm of the victim suggested involvement of a smaller kitchen knife with groove-milled wave profile. Offender-victim position and course of offence were verified and confirmed by evaluation of these specific findings.     

Gunshot injury caused by a training bullet]

In the course of a scuffle a 50-year old man has been shot by a revolver. The culprit and witnesses state, there has been only one shot, whereas the victim declared having been shot twice. The medico-legal investigation revealed a gunshot wound that passed through the left thigh, a grazing shot of the right hand and a superficial lesion of the skin at the forehead with sprinkled gunshot residue in the epidermis. The investigation confirmed the statement of the victim: the first shot to the forehead was caused by a plastic training cartridge, the second to the right hand and thigh by a cartridge loaded with an ordinary bullet.     

Unusual fatalities caused by glass splinter injury]

In the case of a thorax stab wound and an intrapulmonal position of the glass fragment (fall from a ladder into a glass door) an extrathoracic cardiac massage had been carried out. The result of which, an extremely unusual "reanimationtrauma" and the problems connected with it are discussed. In another case of a stab wound of the right iliacal vessels and the position of the glass fragment in the minor pelvis (jump through a thermopane glass of a door, followed by a fight) investigations were first conducted because of the suspicion of manslaughter. The autopsy, however, completely excluded death through fault of another. Further an unusual figured glass cut wound on the left side of the head (fall into a glass brick wall) led to death through gradual bleeding. The question arose whether death was caused by failure to give assistance.     

不同类型线缆剪剪切痕迹的区别

目的　研究三种类型线缆剪剪切线缆的痕迹差异 ;　方法　观察、归纳三种线缆剪形痕的宏观、微观痕迹反映形态 ;　结论　可以根据断头的整体形态、线条流向、弧度、立顶形态和顿剪痕迹等来分析线缆剪的种类。     

用羊角锤撬压形成线形痕迹的检验

目的介绍羊角锤起钉槽撬压形成擦划痕迹的检验方法。方法痕迹整体分析及特征接合。结果具备同一认定条件。结论通过了解羊角锤的结构特点和功能,综合分析撬压时形成痕迹的作用关系,按照现场环境条件制作样本,可以进行同一认定。     

Poisoning caused by a paint stripping agents containing dichloromethane]

It is widely known that inhalation of the solvent dichloromethane can lead to severe intoxication. We report on a fatal accident of a 29-year-old painter. He had to remove the old chlorocaoutchoucpaint of two overflow pools adjoining an empty swimming pool by sand-blasting. After obviously having finished his work in the first pool the painter was found dead, lying on the floor of the second pool. Later an almost empty 10-kg-canister of a paint stripper (macerating agent) the main component of which was dichloromethane was found in the car of the painter. Blood samples of the corpse measured by head space gas chromatography and electron capture detection showed dichloromethane levels in the range of 513-773 micrograms/ml.     

An unusual case of suicide caused by electric current]

The authors describe a suicide case of a 37 year old master joiner caused by electricity. One wire was put around a neck and the other around the left wrist.     

黑色墨迹的拉曼光谱分析

目的对常见的黑色墨迹进行初步筛选,为墨迹的进一步检验提供依据。方法依据黑色墨迹的同色异谱特征,利用显微共焦激光拉曼光谱仪对19种黑色墨迹进行分析检验。结果根据不同墨迹的拉曼谱图,19种黑色墨迹可以分为3大类,即:未检出拉曼峰的墨迹,只检出碳物质的墨迹,以及主体色料为染料的墨迹。结论拉曼光谱可用于区分不同种类黑色墨迹,从而为选择合适的方法对黑色墨迹进一步进行检验奠定基础。     

解析“功能性限定技术特征”的范围

"最高人民法院关于审理侵犯专利权纠纷案件应用法律若干问题的解释"第4条规定:对于权利要求中以功能或者效果表述的技术特征,人民法院应当结合说明书和附图描述的该功能或者效果的具体实施方式及其等同的实施方式,确定该技术特征的内容.结合其他法规中的相关规定以及相关案例,对这一规定进行解读,并对其可能对专利实务操作带来的影响进行探讨.     

The morphological characteristics of fragmentation injuries caused by low-energy random fragments]

Experimental investigations showed real possibility to perform stand laboratory modelling of blast trauma at any distance of fragmentation lesion. Process of interaction between injuring splinters and part of human body has both qualitative and quantitative expressions: different morphologic kinds of human body lesions are in accord with quite specific equivalent of energy parameters expressed via specific kinetic energy. Connections determined give the opportunity to solve special medical problems related to determination of distance between the victim and the blast centre in fragmentation injuring exposure according to character and volume of lesions.     

Trade marks plus? the role of trade marks in the global economy and the danger of over-protection

This article examines the economic role of the trade mark, both as a structuring device and as a means of adding value to products. It shows how its role as a flexible structuring device that provides a distinct focus for goodwill derives from the special meaning of the term “origin” or “trade origin” in trade mark law, this being what a trade mark is supposed to indicate. Firms can control the identity that a trade mark signifies and confers on the products with which it is used without being tied to any particular set of production arrangements. This article also considers how goodwill can be a source of economic benefit both through reducing transaction costs and, in some cases, through adding value to products. This article then examines the economic rationale for the legal protection of trade marks and shows how this is analogous to the rationale for awarding property rights over tangible resources and different from that for other forms of intellectual property right. The pressure to expand the legal protection of stronger trade marks is explored and it is accepted that there is an economic case for doing so. However, it is argued that the additional protection must be carefully calibrated through definitions that take account of its economic rationale and avoid the danger of over-extending it. In particular, this danger of over-protection arises from making a false analogy between stronger trade marks and the kind of intangible output that is the subject of the other forms of intellectual property right.     

Recovering obliterated engraved marks on aluminium surfaces by etching technique

A study has been made of the characteristics of restoration of obliterated engraved marks on aluminium surfaces by etching technique. By etching different reagents on 0.61mm thick sheets of aluminium (99wt%) on which some engraved marks had been erased to different depths it was found that the reagent 60% hydrochloric acid and 40% sodium hydroxide on alternate swabbing on the surfaces was found to be the most sensitive one for these metal surfaces. This reagent was able to restore marks in the above plates erased down to 0.04mm below the bottom of the engraving. The marks also presented excellent contrast with the background. This reagent was further experimented with similar aluminium surfaces, but of relatively greater thickness of 1.5mm. It was noticed that the recovery depth increased slightly to 0.06mm; this suggested the dependence of recovery depth on the thickness of the sheet metal. Further, the depth of restoration decreased in cases where the original number was erased and over which a new number was engraved; the latter results are similar to those of steel surfaces reported earlier [M.A.M. Zaili, R. Kuppuswamy, H. Harun, Restoration of engraved marks on steel surfaces by etching technique, Forensic Sci. Int. 171 (2007) 27-32].     

内凹齿钥匙痕迹特征研究

目的运用光学仪器研究内凹齿钥匙痕迹形态特征。方法制作内凹齿钥匙正常开锁和被钥匙机复制后的样本,用光学显微镜拍照固定痕迹特征。结果内凹齿钥匙开锁痕迹特征明显,且被钥匙机复制后能留下复制痕迹。结论通过检验内凹齿钥匙上的痕迹特征能确定钥匙是否被复制过。